Therefore, during maintenance and repair of the power system of new energy vehicles, the above types of batteries should be mainly targeted. Because the structure of the power battery used in new energy vehicles is more complex, compared with the originally simple-to-maintain battery, this complex-structured battery needs to be flexibly maintained using electronic diagnostic technology.
For new energy vehicles, the internal power battery management system is the "MCU", which mainly includes communication, battery control, storage and other modules. The battery itself will automatically collect relevant data such as temperature, current and voltage of the car, and send the collected data to the management system to determine whether charging is needed.
Take a 4S store repairing Jiangling New Energy Vehicles as an example. The customer informed the maintenance staff that the car stalled for no reason while driving. After the maintenance staff used electronic diagnostic equipment to check during maintenance, they found that the problem was caused by poor contact between the power battery and the system. Then adjust the position of the power battery, test the environment where the battery is located, and inform the customer that the optimal charging temperature of the battery is 0°C to 45°C to avoid excessively low temperatures, which may affect battery performance and lifespan.
Different from conventional cars, the intelligent control of new energy vehicles relies on electronic systems, so the diagnosis of their internal circuit systems is relatively more complicated. If the power battery is compared to the "heart" of a new energy vehicle, the circuit system can be compared to the "blood vessel" of the new energy vehicle. During the use of a car, if the circuit system fails, other internal components will also stop running or be damaged.
For new energy vehicles, the load space of the circuit system itself is limited, and the number of electronic components in new energy vehicles is generally too large. Therefore, it is extremely easy to cause failures due to excessive load during use. Based on this, in order to further improve the functions of the car, most car owners will add some electronic equipment before use to increase the total load of the circuit system. In this way, the circuit system will be damaged, and in severe cases, spontaneous combustion of the circuit may occur, causing serious harm to driving safety.
When using electronic diagnostic technology to diagnose the car's circuit system, you can insert the fault detection instrument into the circuit system and observe the working status of the ABS warning light in real time. If the ABS warning light is still flashing during the startup of the car, It can be determined that there is a fault in the system.
At this time, you can use a digital multimeter to check the voltage status of the DLC3 diagnostic port of the vehicle, use troubleshooting methods to check the fault, and obtain the fault code based on the flashing frequency of the warning light. After all faults have been eliminated, start the driving inspection and record the order in which the warning lights go out to ensure that the order is consistent with the troubleshooting results.