Automobile emergency starting power technology and life application

The car emergency start-up power supply was introduced in 2012. It has been 6 years old. Since its inception, this power supply has been loved by many car owners. It can start our usual use of family cars, motorcycles and other vehicles, even in recent years. Newly-powered new-energy vehicles, car emergency start-up power supplies can also be integrated; and it includes all the functions of mobile power, so it is popular.

Automobile emergency starting power supply process

There are two kinds of emergency starting power supply processes for automobiles. One is the emergency starting power supply for lead-acid batteries. This kind of power supply is a relatively traditional process. It uses a maintenance-free lead-acid battery, which has a large mass and volume. The battery capacity, starting current, etc. will also be relatively large. These products are generally equipped with an air pump, as well as overcurrent, overload, overcharge and reverse indication protection, which can charge various electronic products, and some products also have functions such as inverters.mobile power plant

Another type of lithium polymer battery car emergency start power is a relatively new technology, it is upgraded on the basis of mobile power, built-in high-rate lithium polymer battery, with the late protection technology, at the start When the car can instantly output up to several hundred amperes of current, thus starting the car, this is the core function of this product. It has the characteristics of small size, light weight, easy to grasp by hand, and protection functions such as overcharge and shutdown, and the lighting function is more powerful, and can also support various electronic products. The lighting of such products generally has the function of flashing or SOS remote LED rescue signal light, which is more practical.

Start the car: lead-acid battery car emergency start power supply There are many kinds of currents to start the car, the approximate range is 350-1000A, lithium-ion vehicle emergency start power supply start-up car current should have 300-400A. In order to provide convenience, the car emergency start power supply is compact, portable and durable. It is a good helper for the car owner to start the car. It can provide auxiliary starting power for most vehicles and a small number of ships and motorcycles. It can also be used as a portable 12V DC power supply. Use when you are away from the car or in an emergency.

Notebook power supply: Multi-function car emergency start power supply with 19V voltage output, can provide a stable power supply voltage for notebooks, to ensure that some business people go out of the laptop battery life function to reduce the impact of work, generally 12000mAh polymer battery can give notebook Offers 240 minutes of battery life.

Mobile phone charging: The car starter power supply is also equipped with a 5V USB output interface, which can support a variety of mobile phones, PND, MP3 and other entertainment equipment battery life.

Inflatable: equipped with an air pump and three air nozzles, which can inflate car tires, inflation valves, and various balls.

Principle Analysis of Lithium Ion Battery Protection Circuit in Automobile Emergency Start Power Supply

In today's cars, seat heating, air conditioning, navigation, infotainment, driving safety and other systems have been designed to improve comfort and driving experience. From these systems, it is easy to understand the electronic systems that power various functions in the car. benefit. Now we can hardly imagine a scene just over 100 years ago, when there was no electronic component in a gasoline-powered car. In the turn of the century, the car began to have a crank handle, the headlights began to be illuminated with acetylene gas, and the bells could be used to send a message to the pedestrian. Today's cars are at the junction of electronic systems, minimizing the adoption of mechanical systems and becoming the largest and most expensive "digital tool" in people's lives.

As more and more mechanical systems are replaced by electronic systems, power consumption becomes more and more important. Regardless of whether the owners are not using the car, there is a possibility that the car battery cannot be started due to insufficient battery power. Therefore, the merchants have developed an electronic product based on the car's power - the car emergency start power.

The protection function of the lithium-ion battery is usually completed by the protection circuit board and the current device such as the PTC. The protection board is composed of electronic circuits, and the voltage of the battery core and the charging and discharging circuit are accurately monitored at -40 ° C to 85 ° C. Current, timely control of the current circuit on and off; PTC in the high temperature environment to prevent battery damage. Ordinary lithium-ion battery protection boards usually include control ICs, MOS switches, resistors, capacitors, and auxiliary devices FUSE, PTC, NTC, ID, memory, and the like. The control IC controls the MOS switch to be turned on under all normal conditions, so that the cell and the external circuit are turned on, and when the cell voltage or the loop current exceeds a prescribed value, it immediately controls the MOS switch to turn off, and protects the cell. Safety.mobile power plant

As shown in the figure, the protection loop consists of two MOSFETs (V1, V2) and a control IC (N1) plus some RC components. The control IC is responsible for monitoring the battery voltage and the loop current, and controlling the gates of the two MOSFETs. The MOSFET functions as a switch in the circuit to control the conduction and shutdown of the charging circuit and the discharging circuit, respectively, and C3 is a delay capacitor. With overcharge protection, over discharge protection, over current protection and short circuit protection.

First, the normal state

In the normal state, the "CO" and "DO" pins of N1 output high voltage in the circuit, both MOSFETs are in conduction state, and the battery can be freely charged and discharged. Since the on-resistance of the MOSFET is small, it is usually smaller. 30 milliohms, so its on-resistance has little effect on the performance of the circuit. The current consumption of the protection circuit in this state is μA level, usually less than 7 μA.

Second, overcharge protection

Lithium-ion batteries require a constant current/constant voltage. In the initial stage of charging, they are charged at a constant current. As the charging process, the voltage rises to 4.2V. (Depending on the cathode material, some batteries require a constant voltage of 4.1V.) ), switch to constant voltage charging until the current is getting smaller and smaller. When the battery is being charged, if the charger circuit loses control, the battery voltage will continue to be constant current when it exceeds 4.2V. At this time, the battery voltage will continue to rise. When the battery voltage is charged to over 4.3V, the battery chemistry Side effects will increase, causing battery damage or safety issues. In a battery with a protection circuit, when the control IC detects that the battery voltage reaches 4.28V (this value is determined by the control IC and different ICs have different values), the "CO" pin will be converted from a high voltage to a zero voltage. Turning V2 from on to off, thus cutting off the charging circuit, so that the charger can no longer charge the battery, which acts as an overcharge protection. At this time, due to the presence of the body diode VD2 that is provided by the V2, the battery can discharge the external load through the diode. There is a delay time between when the control IC detects that the battery voltage exceeds 4.28V and when the V2 signal is turned off. The length of the delay time is determined by C3, usually set to about 1 second to avoid the error caused by the interference. judgment.

Third, over discharge protection

When the battery is discharged to the external load, its voltage will gradually decrease with the discharge process. When the battery voltage drops to 2.5V, its capacity has been completely discharged. At this time, if the battery continues to discharge the load, it will cause the battery. Permanent damage. During battery discharge, when the control IC detects that the battery voltage is lower than 2.3V (this value is determined by the control IC, different ICs have different values), its "DO" pin will be converted from high voltage to zero voltage, making V1 Turning from conduction to shutdown, the discharge circuit is cut off, so that the battery can no longer discharge the load, which acts as an over-discharge protection. At this time, due to the presence of the V1 body diode VD1, the charger can charge the battery through the diode. Since the battery voltage can no longer be lowered under the over-discharge protection state, the current consumption of the protection circuit is required to be extremely small. At this time, the control IC will enter a low-power state, and the entire protection circuit consumes less than 0.1 μA. There is also a delay time between when the control IC detects that the battery voltage is lower than 2.3V and the signal that turns off the V1. The length of the delay time is determined by C3, usually set to about 100 milliseconds to avoid errors caused by interference. judgment.

Fourth, over current protection

Due to the chemical characteristics of lithium-ion batteries, battery manufacturers stipulate that their discharge current should not exceed 2C (C=battery capacity/hour). When the battery exceeds 2C current discharge, it will cause permanent damage or safety problems. During normal discharge of the battery, the discharge current is passed through two MOSFETs in series. Due to the on-resistance of the MOSFET, a voltage is generated across the MOSFET. The voltage value U=I*RDS *2, RDS is a single MOSFET on-resistance, the “V-” pin on the control IC detects the voltage value. If the load is abnormal for some reason, the loop current increases, and when the loop current is so large that U>0.1V (this value is When the control IC determines that different ICs have different values, the "DO" pin will be converted from a high voltage to a zero voltage, causing V1 to turn from on to off, thereby cutting off the discharge loop and causing zero current in the loop. It acts as an overcurrent protection. There is also a delay between when the control IC detects an overcurrent and when the V1 signal is turned off. The length of the delay is determined by C3, usually about 13 milliseconds, to avoid misjudgment caused by interference. In the above control process, the overcurrent detection value depends not only on the control value of the control IC, but also on the on-resistance of the MOSFET. When the MOSFET on-resistance is larger, the over-current protection is applied to the same control IC. The smaller the value.

Five, short circuit protection

When the battery is discharging to the load, if the loop current is so large that U>0.9V (this value is determined by the control IC and different ICs have different values), the control IC determines that the load is short-circuited, and its “DO” pin will It quickly turns from a high voltage to a zero voltage, turning V1 from on to off, thereby cutting off the discharge loop and providing short-circuit protection. The short-circuit protection has a very short delay time, usually less than 7 microseconds. Its working principle is similar to overcurrent protection, except that the judgment method is different, and the protection delay time is also different.

The working principle of the single-cell lithium-ion battery protection circuit is described in detail above. The protection principle of the multi-cell series lithium-ion battery is similar, and will not be described here. In addition to the control IC, there is another important component in the circuit, the MOSFET, which acts as a switch in the circuit. Since it is directly connected in series between the battery and the external load, its on-resistance has a performance on the battery. The effect is that when the selected MOSFET is better, its on-resistance is small, the internal resistance of the battery pack is small, the load carrying capacity is also strong, and the power consumed during discharge is also small. 

Why is lithium battery a new energy source?

As we all know, the advantage of new energy vehicles is that they are more carbon-efficient than gasoline-fueled vehicles. It uses unconventional vehicle fuel as a power source, such as lithium batteries, hydrogen fuel, and so on. Lithium batteries are also widely used in applications other than new energy vehicles, mobile phones, notebook computers, tablet computers, mobile power supplies, electric bicycles, power tools, and so on.mobile power plant

At present, lithium batteries are used by both the world-renowned Tesla and the well-known mainstream new energy vehicles in China. Lithium batteries used by these new energy vehicle manufacturers can be classified into lithium iron phosphate batteries, ternary lithium batteries (including NCA and NCM), lithium manganate batteries, lithium cobalt oxide batteries, nickel hydrogen batteries, and titanic acid. Lithium battery, etc. Among them, Tesla, Beiqi E200/150, GAC Chuanqi GA5EV, Beijing Benz, Brilliance BMW 5 Series, Weilai Automobile, etc. are all ternary lithium batteries. BYD, which used lithium iron phosphate batteries, also turned to the ternary lithium battery camp.

However, whether it is a ternary lithium battery or a lithium iron phosphate battery, it is impossible to avoid the hidden dangers of inflammable and explosive.

Lithium is the most active metal in the world. Because its chemical properties are too active, when lithium metal is exposed to the air, it will react intensely with oxygen, so it is prone to explosion and burning. In addition, lithium-ion batteries also generate redox reactions during charging and discharging. Explosion and spontaneous combustion are mainly caused by the accumulation of lithium batteries after they are heated, and they are not able to be diffused and released. Simply put, the lithium battery generates a large amount of heat during charging and discharging, which causes the internal temperature of the battery to rise and the temperature between the cells to be uneven, which causes the new energy of the battery to be unstable.

In August of this year, Apple's retail store in Amsterdam, the Netherlands, had to explode the iPad battery and release potentially harmful substances into the air. The retail store had to evacuate the consumers in the store to temporarily close the door. Previously, Samsung, Xiaomi, Huawei, etc. have also been exposed to the spontaneous combustion of mobile phones. Many accidents have shown that when people are not properly charged or the ambient temperature is too high, it is easy to cause spontaneous combustion and explosion of the lithium battery, which has become a heart disease for manufacturers.

Why do you have a lithium battery?

The limitations in battery selection depend to a large extent on the development of the battery itself and commercial conditions. The world's first battery "voltaic stack" was made of zinc plate and tin plate. After that, zinc and copper batteries, wet batteries and dry batteries appeared one after another. Because they will not be missed and easy to carry, the dry battery will be long afterwards. It was widely used in time and was replaced by a rechargeable nickel-iron battery invented by Edison. Finally, lithium cobalt oxide was used as the positive electrode material, and lithium ion battery made of lithium metal as the negative electrode material became the last choice in the market.

Compared to other batteries, lithium batteries have obvious advantages. It has a long service life of more than six years, and the battery is small in size and high in energy density, reaching 460-600Wh/kg, which is 6 to 7 times that of lead-acid batteries. At present, Tesla announced that the 21700 battery system jointly developed with Panasonic has an energy density of 300Wh/kg. At the same time, aluminum batteries have high power endurance. Lithium iron phosphate lithium ion batteries for new energy vehicles can achieve 15-30C charge and discharge capacity, which is convenient for high-intensity start-up and acceleration of automobiles. Lithium batteries have high and low temperature adaptability, are environmentally friendly, and basically do not consume water during production.

In terms of commercial use of batteries, batteries that can be used for large-scale commercial applications are limited by the limitations of volume, weight, energy storage and release capacity, storage time, service life, cost, ease of use, and mass production. For these two reasons, lithium batteries have become the best solution.

Although the properties of the lithium battery itself determine the fate of its "flammable and explosive", it is not completely impossible to reduce risk and safety. Whether it is a mobile phone company or a new energy car company, through a reasonable battery management system and thermal management system, the battery can be safe and there will be no explosion or spontaneous combustion.

How to solve?

The battery will release heat during work, and it will spontaneously ignite and explode if it is too late to release. Therefore, it can be managed by the battery thermal management system. The thermal management system equipped with the new energy vehicle is a subsystem in the battery management system, which enables the battery to be cooled when the temperature is too high, and preheated when the temperature is low, thereby better Tesla's unique battery management system is a typical example of the performance of the battery.

Tesla has equipped its cars with thousands of lithium cobalt oxide batteries to provide kinetic energy. Its 18650 battery life can be recharged more than 1000 times, but due to the large unit density of the battery, the risk of spontaneous combustion and fire is also higher. Tesla uses its battery management system to realize real-time monitoring of various physical parameters of the battery, evaluate battery usage status, and conduct online diagnosis and early warning. It can also perform discharge and pre-charge control, battery balance management and thermal management. . Taking battery thermal management as an example, the temperature rise of the battery is controlled by liquid cooling, ie 50% water + 50% ethylene glycol.

In fact, manufacturers have already realized the limitations of lithium batteries. Fuel cells, graphene batteries, and lithium-air batteries are all in the direction of research and development. Hydrogen fuel cells in fuel cells are the most concerned, and hydrogen energy vehicles, as a branch of new energy vehicles, have also been doing commercial exploration.

In 2008, China's self-developed Volkswagen Passat model was held at the New Energy Vehicle Engineering Center of Tongji University through the restructuring and integration of fuel cell vehicles, and it was put into operation during the Beijing Olympic Games. Today, ten years have passed. In this year's CES Asia in Shanghai, Hyundai Motor exhibited a new generation of hydrogen fuel cell vehicle NEXO. The fuel cell system of this model has an efficiency of 60% and is already at the forefront of the world.

Compared with lithium batteries, fuel cells are safer. Because hydrogen explosions require extremely high concentrations, they often start to burn before the explosion, but they are difficult to explode. Moreover, the density of hydrogen is lower than the density of air, even if the fire is above the gas source, and not like lithium batteries or gasoline, the fuel is at the bottom of the cabin, and the entire vehicle will be quickly scrapped. In addition, the fuel cell has the advantages of high power generation efficiency, low environmental pollution, low noise, high reliability, and easy construction of a battery power station.

Of course, the high cost of fuel cells, transportation, and storage are also insufficiency compared to lithium batteries.

At last

Similarly, 3C digital products such as mobile phones and tablets using lithium batteries, emergency products such as mobile power supplies and emergency starting power supplies for automobiles, all of which have encountered difficulties in spontaneous combustion and explosion problems, let alone new energy vehicles, which must take into account More difficult points. New energy vehicles are the driving force of the times. Its wide-ranging application is undoubted. Although capital and mass production are urgent issues for new energy vehicles, at any time, product safety is the first.

The car can't start, should your car battery be changed?

No one can start the car, and it is estimated that half of the owners will be at a loss, then call the rescue. The experienced car owner has already taken out the car emergency start power self-help rescue started. The car can't start to have a big relationship with the car battery, so today Xiaobian brings a battery knowledge.power bank plant

The car can't start. Do you know about the battery?

1, the engine voltage is too low

Some vehicles have a voltage display on the dashboard. After the vehicle is started, the voltage of the generator is around 14V. If it is lower than 13V, it means that the car generator has failed. It is recommended to go to the 4S shop for inspection and repair.

2, excessive discharge

Make sure you forget to turn off the appliance when you leave, such as car headlights, reading lights, and so on. If this is the case, your car battery will be consumed a lot by the appliances, and even the battery will be completely out of power. In this case, if you are closer to the city, you can ask the insurance company to provide free rescue. If it is too far away or the time is tight, then use the car emergency power supply self-help rescue. In addition, the next time you remember to turn off the appliance and then leave when you stop the parking, this deep discharge will cause great damage to the battery, and the battery life will be greatly shortened.

3, parking too long

If it is not the above two situations, think about how long your car has been parked. Some car owners often travel a business, and a business trip is a week or even longer. If you travel for a long time, it will not start, and the battery will be used within one and a half years. This may cause the car to leak. It is necessary to look at the electric eye on the top cover of the battery. If the electric eye is white, the leakage of the car should be the main reason. You should go to a professional battery store to check if there is any leakage.

4, fuel exhaustion

Some car owners, after starting the car, start the vehicle and hear the motor rotate, but the car can't start. At this time, you can check whether the fuel meter is running out of fuel. Also think about whether your car has a hidden lock. Don't think that this is a joke. I have encountered a lot of such rescue targets. Excluding it, maybe it will catch fire.

5. Is the speaker enough?

If the above reasons are not, then press the car horn, the speaker is not loud enough? If the instrument light does not become very dark due to the horn, the ignition switch does not respond, so there may be problems with your ignition system, such as the ignition lock is broken, or the motor is broken.

6, battery aging

Once the battery is not activated enough, or the dashboard light is dim when the car is ignited, or the ignition time is longer than normal. These phenomena indicate that your battery has been aging. It is recommended to have a car emergency start power supply just in case, but the most insured need to replace the matching battery.

7, the battery smells hot

There are also some careful car owners reacting and smelling the battery is stinky. Please see if the battery is steaming or not. If the battery is hot, the meter display voltage is not high. In this case, the battery is broken, please replace the battery.

to sum up

Under normal circumstances, the normal life of a car battery is about 2-3 years, but there are many people who have used it for more than 4 years. The service life of the battery is related to the driving habits of the owner and the maintenance of the battery. Here is the opinion that if you encounter problems that may be related to the battery, please don't panic, first carry out the self-test battery and solve it. If you don't find out the reason, you can try to use the car emergency start power to start the fire. Finally, Consider call rescue again.

The car can't start, should your car battery be changed?

No one can start the car, and it is estimated that half of the owners will be at a loss, then call the rescue. The experienced car owner has already taken out the car emergency start power self-help rescue started. The car can't start to have a big relationship with the car battery, so today Xiaobian brings a battery knowledge.power bank plant

The car can't start. Do you know about the battery?

1, the engine voltage is too low

Some vehicles have a voltage display on the dashboard. After the vehicle is started, the voltage of the generator is around 14V. If it is lower than 13V, it means that the car generator has failed. It is recommended to go to the 4S shop for inspection and repair.

2, excessive discharge

Make sure you forget to turn off the appliance when you leave, such as car headlights, reading lights, and so on. If this is the case, your car battery will be consumed a lot by the appliances, and even the battery will be completely out of power. In this case, if you are closer to the city, you can ask the insurance company to provide free rescue. If it is too far away or the time is tight, then use the car emergency power supply self-help rescue. In addition, the next time you remember to turn off the appliance and then leave when you stop the parking, this deep discharge will cause great damage to the battery, and the battery life will be greatly shortened.

3, parking too long

If it is not the above two situations, think about how long your car has been parked. Some car owners often travel a business, and a business trip is a week or even longer. If you travel for a long time, it will not start, and the battery will be used within one and a half years. This may cause the car to leak. It is necessary to look at the electric eye on the top cover of the battery. If the electric eye is white, the leakage of the car should be the main reason. You should go to a professional battery store to check if there is any leakage.

4, fuel exhaustion

Some car owners, after starting the car, start the vehicle and hear the motor rotate, but the car can't start. At this time, you can check whether the fuel meter is running out of fuel. Also think about whether your car has a hidden lock. Don't think that this is a joke. I have encountered a lot of such rescue targets. Excluding it, maybe it will catch fire.

5. Is the speaker enough?

If the above reasons are not, then press the car horn, the speaker is not loud enough? If the instrument light does not become very dark due to the horn, the ignition switch does not respond, so there may be problems with your ignition system, such as the ignition lock is broken, or the motor is broken.

6, battery aging

Once the battery is not activated enough, or the dashboard light is dim when the car is ignited, or the ignition time is longer than normal. These phenomena indicate that your battery has been aging. It is recommended to have a car emergency start power supply just in case, but the most insured need to replace the matching battery.

7, the battery smells hot

There are also some careful car owners reacting and smelling the battery is stinky. Please see if the battery is steaming or not. If the battery is hot, the meter display voltage is not high. In this case, the battery is broken, please replace the battery.

to sum up

Under normal circumstances, the normal life of a car battery is about 2-3 years, but there are many people who have used it for more than 4 years. The service life of the battery is related to the driving habits of the owner and the maintenance of the battery. Here is the opinion that if you encounter problems that may be related to the battery, please don't panic, first carry out the self-test battery and solve it. If you don't find out the reason, you can try to use the car emergency start power to start the fire. Finally, Consider call rescue again.

Reasonable choice of multiple batteries

Nowadays, most of the batteries used in automobiles are dry-charged batteries. The advantage is that after the electrolyte is added, the car can be started within 30 to 40 minutes without charging. Because some friends do not understand the principle, they will not be maintained, so the life of the battery is greatly shortened, so they have to equip the car with an emergency starting power supply. However, the car emergency start power is an emergency tool after all. How to choose and use the battery correctly is the most important.

First, learn to identify the letters on the battery when buying a battery, where the QA letter is a dry charge battery.

2. When adding the electrolyte, shake the electrolyte first and then add it to the battery, and be careful not to splash the electrolyte on the hands and clothes.

Third, the battery without the marking line, the electrolyte can be added to the high-electrode plate 10 to 15 mm; there are two red-line batteries, the electrolyte is not more than the upper red line. Some drivers think that the more the electrolyte is added, the more electricity it has. This is wrong. When the car is driving at high speed, the generator rotates at a higher speed; its power generation is greater than the battery, and the battery is charged. At this time, the electrolyte will expand, and if the electrolyte is too full, it will overflow from the small hole of the battery cover. The electrolyte is electrically conductive. Once the solution is also discharged to the positive and negative poles, self-discharge will occur, and the car will not start and shorten the battery life. In this case, apply the cotton wire to wipe off the electrolyte. If it is too sticky, it should be wiped off with boiling water.

4. Do not let other substances fall into the battery when adding liquid. If there is any material falling off, do not use metal materials to fish. Use dry wood rods to remove impurities, such as wire or copper wire to hook, metal molecules will In the acid corrosion, enter the battery to form self-discharge, damage the battery.

5. Always check the small holes on the battery cover for ventilation. If the battery cover is blocked, the generated hydrogen and oxygen will not be discharged. When the electrolyte expands, the battery case will be broken to reduce the battery life. .

6. Always check the liquid level of the electrolyte and add the electrolyte in time. When adding the replenishing liquid to the battery in the winter, it is better to add the engine after the car is started, and avoid the rabbit electrolyte from freezing.

Seven, the car that has not been used for a long time should start the car every 25 days or so, and control the medium speed for about 20 minutes with the throttle. Otherwise, the time will be too long, and the car will not start when the car is used.

8. When the battery is removed from the car, the negative electrode should be removed first and then the positive electrode should be removed. Be sure to unscrew the battery cover when charging. Do not use the hand with open flame to approach the battery port being charged. Because the hydrogen generated in the battery is easily deflagrated when charging, the battery will be damaged and the electrolyte will hurt people.power bank plant

Nine, do not just replace the battery with a larger capacity than the original battery, because the power generation of the generator on the car is fixed, the power generation will not increase, such as changing the battery with large capacity, the new battery will be charged, the car Can not start smoothly, battery long-term power loss is worse.

10. When starting the car, the starting time should not exceed 3 to 5 seconds.

Well, the above is about the choice of car battery and the use of maintenance, learn these methods, not only can choose a durable car battery, but also because of the use of the battery to significantly increase the service life. However, the car is a consumable item, and the car battery is difficult to start when it is aging, or it cannot be started due to other reasons. Therefore, the owner still needs to have a standing emergency power supply for the car, and it is necessary to change it.

Reasonable choice of multiple batteries

Nowadays, most of the batteries used in automobiles are dry-charged batteries. The advantage is that after the electrolyte is added, the car can be started within 30 to 40 minutes without charging. Because some friends do not understand the principle, they will not be maintained, so the life of the battery is greatly shortened, so they have to equip the car with an emergency starting power supply. However, the car emergency start power is an emergency tool after all. How to choose and use the battery correctly is the most important.

First, learn to identify the letters on the battery when buying a battery, where the QA letter is a dry charge battery.

2. When adding the electrolyte, shake the electrolyte first and then add it to the battery, and be careful not to splash the electrolyte on the hands and clothes.

Third, the battery without the marking line, the electrolyte can be added to the high-electrode plate 10 to 15 mm; there are two red-line batteries, the electrolyte is not more than the upper red line. Some drivers think that the more the electrolyte is added, the more electricity it has. This is wrong. When the car is driving at high speed, the generator rotates at a higher speed; its power generation is greater than the battery, and the battery is charged. At this time, the electrolyte will expand, and if the electrolyte is too full, it will overflow from the small hole of the battery cover. The electrolyte is electrically conductive. Once the solution is also discharged to the positive and negative poles, self-discharge will occur, and the car will not start and shorten the battery life. In this case, apply the cotton wire to wipe off the electrolyte. If it is too sticky, it should be wiped off with boiling water.

4. Do not let other substances fall into the battery when adding liquid. If there is any material falling off, do not use metal materials to fish. Use dry wood rods to remove impurities, such as wire or copper wire to hook, metal molecules will In the acid corrosion, enter the battery to form self-discharge, damage the battery.

5. Always check the small holes on the battery cover for ventilation. If the battery cover is blocked, the generated hydrogen and oxygen will not be discharged. When the electrolyte expands, the battery case will be broken to reduce the battery life. .

6. Always check the liquid level of the electrolyte and add the electrolyte in time. When adding the replenishing liquid to the battery in the winter, it is better to add the engine after the car is started, and avoid the rabbit electrolyte from freezing.

Seven, the car that has not been used for a long time should start the car every 25 days or so, and control the medium speed for about 20 minutes with the throttle. Otherwise, the time will be too long, and the car will not start when the car is used.

8. When the battery is removed from the car, the negative electrode should be removed first and then the positive electrode should be removed. Be sure to unscrew the battery cover when charging. Do not use the hand with open flame to approach the battery port being charged. Because the hydrogen generated in the battery is easily deflagrated when charging, the battery will be damaged and the electrolyte will hurt people.power bank plant

Nine, do not just replace the battery with a larger capacity than the original battery, because the power generation of the generator on the car is fixed, the power generation will not increase, such as changing the battery with large capacity, the new battery will be charged, the car Can not start smoothly, battery long-term power loss is worse.

10. When starting the car, the starting time should not exceed 3 to 5 seconds.

Well, the above is about the choice of car battery and the use of maintenance, learn these methods, not only can choose a durable car battery, but also because of the use of the battery to significantly increase the service life. However, the car is a consumable item, and the car battery is difficult to start when it is aging, or it cannot be started due to other reasons. Therefore, the owner still needs to have a standing emergency power supply for the car, and it is necessary to change it.