What causes the failure of the power battery of an electric vehicle?

Due to the consistency of the battery cell, the cycle life of the whole pack will generally be discounted, that is, 1200-1600 weeks (although it is not fully charged and discharged in the battery pack, but in the actual application process, there are generally fast charging, low temperature charging, or high temperature use conditions, which will affect the life to a certain extent); At that time, the original new energy vehicle will be replaced, which is equivalent to extending the service life. Maybe in the future, it will develop into a new model that doesn't cost money to buy a car and value-added services need money, and then you don't have to worry about battery life.

At present, the ternary lithium battery pack equipped with new energy vehicles, the number of cycles is about 500 to 1000 times, if it exceeds this number of times, the capacity of the ternary lithium battery pack will decline significantly. However, the Roewe ER6 has improved the three-electric technology, and the battery life has been greatly increased. The service life of lithium iron phosphate battery and ternary lithium battery is different, according to the service life of the battery, the battery is measured by the number of cycles, generally speaking, the lithium iron phosphate battery can be cycled about 2000 times, and the current ternary lithium battery can generally be cycled about 1400 times.

If in the daily driving process, reasonable maintenance, can appropriately extend the use time of the car battery, but with the extension of time, the performance of the battery will also decline accordingly, so the owner needs to check in time and replace it reasonably. The battery is a sensitive part, in order to improve the service life of the battery, it is best to maintain about 70% of the power when it is parked for a long time; Try not to accelerate sharply while driving.

Conversely, when the outside temperature becomes very low, the battery heater maintains the performance of the battery. Batteries deteriorate when they get hot and don't deteriorate when they get cold, but they don't perform well. There is a certain difference in the lifespan of electric vehicles in the south and the north, and it also has a lot to do with the temperature.

Pure electric vehicles are composed of power battery packs, and the battery group process is very complex, requiring eight consistencies, namely: voltage value, internal resistance value, and capacity value. Wait a minute.

It is very likely that the voltage of the battery is too low, so it will cause the power battery to fail.

It is very likely that there is a problem with the battery system, or there is a fault in the circuit system, there is a fault in the management system of the battery, there is a problem with the part that perceives the battery, there is a problem with the power aspect and the power cannot be perceived.

It may be caused by a short circuit in the battery, or the car consumes too much energy, or it may be caused by charging.

The reason for the failure of electric vehicles is that they are particularly fast in the process of driving, so there is obvious power consumption, and it is easy to break down at this time.

Temperature Failure:

1.The temperature difference between the battery is too large.

Possible cause: The cooling fan plug is loose and the cooling fan is faulty.

Troubleshooting: Reseat the fan plug cable; Separate power supply to the fan and check whether the fan is normal.

2.The battery temperature is too high or too low.

Possible causes: Loose cooling fan plug, malfunctioning cooling fan, damaged temperature probe.

Troubleshooting: Reseat the fan plug cable; Separate power supply to the fan and check whether the fan is normal. Check whether the actual temperature of the battery is too high or too low; Measure the internal resistance of the temperature probe.

Insulation failure: possible causes: water ingress into the battery box or plug-in, leakage of battery cells, high ambient humidity, false alarm of insulation, and other high-voltage components of the vehicle (controller, compressor, etc.) are insulated.

Solution: If the positive electrode is to the ground, if the voltage or insulation resistance value is less than the specified value, the negative electrode circuit will be sentenced to leakage; If the negative electrode is to the ground, if the voltage or insulation resistance value is less than the specified value, the positive electrode circuit is sentenced to leakage. According to the size of the leakage voltage divided by the single string voltage value at this time, the leakage point can be calculated, and then analyzed and processed according to different situations.

Hello, at present, BAIC BJEV provides an 8-year 150,000 km (whichever comes) warranty for the core components of the vehicle, and a 3-year 120,000 km (whichever comes first) vehicle warranty, so you can use it with confidence.

Energy conservation and emission reduction around the world.

Under pressure, in recent years, new energy vehicles have developed rapidly, electric vehicle products are becoming more and more abundant, the level of intelligence is getting higher and higher, and the capacity and endurance of power batteries are also rapidly improving. However, the power battery safety problem in front of us has not been too obvious improvement, statistics show that power battery failure is still one of the main causes of electric vehicle accidents, due to the power battery failure caused by the vehicle spontaneous combustion also has considerable harm. So today, let's take a look at what are the main faults in the power battery system of electric vehicles?

1.Insulation resistance failure.

The degree of electrification of electric vehicles is higher than that of traditional vehicles, and such as battery packs, electric drive systems, high-voltage power auxiliary equipment systems, charging and high-voltage wiring harnesses, etc., may lead to high-voltage electricity under the harsh environmental impact of car collisions, overturning of field molds and car operation.

road with car chassis.

The insulation performance is greatly reduced, which may cause the occurrence of automobile fire, which directly affects the life safety of automobile drivers and passengers. Therefore, in the design of high-voltage systems for electric vehicles, it is first necessary to ensure that the insulation resistance value is greater than 100 V; Secondly, when the insulation resistance value of the car is lower than the specified value, the high-voltage management system should cut off all the high-voltage circuits in time and send out an audible and visual alarm, and continue for a certain period of time until the original fault disappears, and the car can be allowed to power on the next time.

2.Voltage detection and faults.

Pure electric vehicles.

There is no doubt that the power battery is the power battery, and the voltage of the power battery has a lot to do with the discharge efficiency. Therefore, in order to ensure the service life of electric vehicles, as well as the safety of low-voltage electricity, batteries and drivers, it is necessary to design detection circuits and high-voltage electric systems for real-time and accurate detection.

3.Power battery system failure.

The function of the medium and high voltage system of electric vehicles is to ensure the transmission of power and electric energy of the vehicle system, and to detect the insulation fault, open circuit fault, grounding fault and high voltage fault of the entire high-voltage system at any time, which is the primary task to ensure the safety of vehicle equipment and personnel, and is also one of the key technologies for the industrialization of electric vehicles. The power battery system, the main component of electric vehicles, is a high-voltage component, and its design directly affects the safety and reliability of the whole vehicle. In the power battery system, from the point of view of the location of the fault, it is divided into sensor failure and actuator failure (contactor.

faults) and component failures (cells.

faults), etc., it is necessary to diagnose and deal with the fault of the power battery system.

The main faults that occur are that the battery is not charged, the battery cannot be charged, the battery is hot, the battery **, and the battery pressure is not enough.

The main failure is the battery failure, the charging is not congratulated, or there is a failure before the operation of Huihong eggplant, and there will be some damaged faults, that is, the use time is too long, and the internal parts are not replaced, so it causes damage, bearing and spline wear failure, and so on.

The fault here is probably a short circuit or a lack of power, Jing Tanwu may also be because there is no oil or there is a problem with the engine, or it may be because the car itself is worn out and the key is relatively heavy, or the battery is dead.

The engine will fail, the chassis will fail, the battery will run out of power, the brakes will be affected, and the power of the car will also be affected.

Power battery module.

Battery cell: The smallest unit that constitutes a power battery module. It is generally composed of a positive electrode, a negative electrode, an electrolyte and an outer shell. It can realize the direct conversion between electrical energy and chemical energy;

Battery module: the combination of a group of battery cells connected in parallel, and the rated voltage of this combination is equal to the rated voltage of the battery cell, and is the smallest grouping of battery cells connected in the physical structure and circuit, and can be replaced as a unit;

Module: A combination composed of multiple battery modules or single cells connected in series.

The C30DB project uses a lithium-ion power battery system, which is a rechargeable battery, which mainly relies on lithium ions to move between the positive and negative electrodes to work. When charging, lithium ions are de-intercalated from the positive electrode and embedded into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; The opposite is true when discharging. Lithium-ion batteries can be divided into lithium cobalt oxide batteries, lithium manganese oxide batteries, lithium iron phosphate batteries and three-element batteries according to the different cathode materials.

The most common reason is that the temperature difference of the battery is large, the problem lies in the fan that dissipates heat, check whether the fan is working normally, unplug the plug again, and if necessary, you need to supply power to the fan separately.

The battery failure may be due to immersion in water, so it will show the battery failure, and the drive system failure may be due to the collision damage, at this time, you should find a repair shop master to help repair it.

The most common failure problem of new energy vehicles is the power system, and at this time, it is necessary to check whether the engine of the new energy vehicle is operating normally. See if the battery needs to be replaced.

New energy vehicles are mainly a type of car that adheres to the core concept of energy conservation and environmental protection, is developed on the basis of modern battery technology and electronic technology, takes electric energy as the main power, and can achieve kinetic energy, with low energy consumption and low environmental pollution.

The biggest difference between new energy vehicles and traditional fuel vehicles is the difference in the power system, and the core power system of new energy vehicles is the electric motor. Therefore, motor drive system failures are more common, and such failures are divided into two categories: mechanical faults and electronic faults.

Electronic faults generally include the failure of the rotor winding and stator winding, while the mechanical fault is generally manifested as the failure of the internal bearings, transmission shafts, iron cores and other components of the drive system. The occurrence of this kind of fault will lead to abnormal motor driving, including failure to start, abnormal noise, abnormal jitter, etc., which will have a negative impact on the use experience and driving safety of new energy vehicles.

Electrical energy is the main power of new energy vehicles**, and the power battery is the core device for storing and discharging electric energy. For pure electric vehicles, the power battery is mainly stored through independent DC charging piles, and the input voltage of the charging piles is generally 15% of three-phase four-wire AC380V with a frequency of 50Hz.

The power of the power battery of the diesel-electric hybrid vehicle is divided into two kinds, the first is that the car is driven by fuel, through the power system, the excess power is converted into electrical energy, and then stored in the battery. The second type, which is similar to a pure electric vehicle, is also charged through an external independent charging station, which is called a plug-in hybrid vehicle.

Obviously, the difference in the structure of the power system means that there is also a big difference in the failure of the power battery. The failure of the power battery of pure electric vehicles is generally manifested as low charging efficiency, inability to charge and insufficient power output. The failure of the power battery of hybrid vehicles is more complicated, in addition to the battery itself, the supporting management system may also have problems.

If the management system fails, it will cause the battery to be overloaded and overcharged, which will not only affect the daily use of the car, but also affect the battery life.

The fundamental reason is likely to be the quality of the battery, which may be caused by overcharging, so we must repair it in time and pay attention to the safety of the car.

There are many reasons for this, it may be the weather, it may be the temperature, it may be the surrounding situation, and it may be the problem of the line.

It is likely that the battery is aging or it may be caused by abnormal charging, and it must be repaired in time to avoid potential safety hazards.

The reason for the failure of the motor drive system and the power battery of the new energy vehicle is that the motor to start the system failure and the power battery failure have undergone some changes.