Power battery PACK is generally composed of five major systems.　　 How are these five systems assembled together to form a complete and reliable battery PACK? It depends on the assembly process.

　　Power battery PACK is generally composed of five major systems.

　　How are these five systems assembled together to form a complete and reliable battery PACK? It depends on the assembly process.

　　The assembly process of 　　PACK is actually somewhat similar to the engine assembly process of traditional fuel vehicles.

　　The five systems are connected together by bolts, nuts, cable ties, clamps, wire harness throwing nails and other connectors to form an assembly.

　　Power battery pack production process_Introduction to the four major processes of power battery pack

　　2. Air tightness testing process

　　The power battery PACK is generally installed under the seat of a new energy vehicle or under the trunk, and is directly in contact with the outside world. When high-voltage electricity comes into contact with water, you can imagine the consequences of things through common sense. Therefore, when a new energy vehicle is wading through the water, the battery PACK needs to have good airtightness.

　　The air tightness test in the manufacturing process of power battery PACK is divided into two links:

　　1) Airtightness testing at the thermal management system level;

　　2) PACK-level air tightness test;

　　The protection level system drafted by the International Electrotechnical Commission (IEC) stipulates that the power battery PACK must reach the IP67 level.

　　At the Shanghai Auto Show in April 2017, SAIC Passenger Cars showed off its awesome high-level airtight protection technology. Put the whole PACK under charge in the goldfish tank to soak for 7 days, the goldfish is intact, and there is no water in the PACK.

　　3, software flashing process

　　The power battery PACK without software has no soul.

　　Software flashing is also called software burning, or software filling.

　　The software flashing process is to flash the BMS control strategy into the CMU and BMU in the BMS in the form of code, so that the battery status information data collected during the battery test and use process will be processed and analyzed by the electronic control unit. Then, according to the analysis results, control commands are issued to the relevant function modules in the system, and finally the information is transmitted to the outside world.

　　Power battery pack production process_Introduction to the four major processes of power battery pack

　　4, electrical performance testing process

　　The electrical performance testing process is the testing process that must be done after the above three processes are completed, that is, before the product goes offline.

　　The electrical performance test is divided into three links:

　　1) Static test:

　　Insulation testing, charging status testing, fast and slow charging testing, etc.;

　　2) Dynamic test;

　　Realize the evaluation of power battery capacity, energy, battery pack consistency and other parameters through a constant high current.

　　3) SOC adjustment;

　　Adjust the SOC of the battery PACK to the factory SOC

　　SOC: StateOfCharge, the popular one is the remaining power of the battery.