First, the reason why it cannot be charged
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In addition to the failure of charging equipment or electric vehicles, under normal circumstances, the reason why electric vehicles cannot be charged can be explained from the charging interface and communication protocol two aspects:
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1, charging interface, due to the global existence of the United States, Europe, China's three major charging interface standards, therefore, Various car companies have also made different designs on the charging interface in the configuration suitable for their respective technical routes, such as European Combo interface, Japanese CHAdeMO interface, Tesla charging interface, CCS interface adopted by some American and German systems, and GB\/T20234 interface in China. This means that at present, foreign cars cannot connect with domestic charging piles from the hardware interface, for example, tesla can only build its own charging station to ensure the market promotion of models in China.
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For China's national standard GB\/T20234, the AC interface adopts a seven-pin design, the DC interface adopts a nine-pin design, domestic car companies are designed to follow this standard, but in the early days, some car companies took into account the battery life extension, some models did not design DC charging interface. It is normal for some owners to encounter DC piles that cannot be charged in public charging piles.
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For users, it is necessary to first find out whether the charging interface of their car is domestic or foreign, and it is necessary to be able to charge AC or DC.
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2, the communication protocol, the current charging protocol difference is the main reason for the current charging can not be charged, to explain this problem requires an understanding of the basic principle and process of AC charging and DC charging.
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(1) The process of AC charging is the transmission of AC power through the charging pile - vehicle charger - power battery, from the national standard design, there is no communication relationship between the charging pile and the vehicle, generally speaking, the AC charging pile is a slightly larger power socket, there is no docking between the charging pile and the vehicle communication protocol, so if it is AC charging, In theory, all models are rechargeable.
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(2) The process of DC charging is simply the transmission of DC through the charging pile - power battery, eliminating the link of the car charger in the middle, which requires the communication between the charging pile and the vehicle control device or battery management system (BMS). The national standard GB\/T20234 stipulates that the CAN bus is used. Data transmission and control of the charging process are carried out in the form of charging messages, among which the S and S-two needles on the DC interface are used for charging communication, and the national standard GB\/T27930 also stipulates the relevant contents of the communication protocol. In reality, charging equipment manufacturers and car manufacturers will have their own charging protocols, although they are in line with national standards, but still with their own \"characteristics\
If the electric car is not charged, there are no more than three situations:
1 charger is damaged borrow a normal charger with the same specifications to try 2. The battery is broken take out the battery separately, connect the normal charger, charge it to try, measure the voltage, do a discharge test 3. If the internal line of the electric car is broken, the charger and the battery are no problem, and the line is not broken.