A battery module consists of a number of cells. The battery module with good consistency needs to be assembled into a modular battery module according to the precise design through strict screening, and the single battery monitoring and management device is added. CATL module fully automated production line, the whole process by more than a dozen precision manipulator cooperation. In addition, each module has its own fixed identification code, problems can be traced back to the whole process.
feeding
The cell is transferred to the specified position, and the manipulator automatically grabs and feeds it into the module assembly line.
Give the battery a bath - plasma cleaning process
Clean the surface of each cell (CATL Ningde times uses plasma treatment technology to ensure cleanliness). Ionic cleaning is used to ensure that contaminants do not adhere to the bottom of the cell during the process.
Why plasma cleaning? The reason is that plasma cleaning technology is the most thorough stripping cleaning method, its biggest advantage is no waste liquid after cleaning, the biggest characteristic is to metal, semiconductor, oxide and most of the polymer materials can be well treated, can realize the overall and local and complex structure of the cleaning.
Assemble the cells -- glue the cells
Before assembling the cell, glue the surface. In addition to the role of fixing glue, but also play a role in insulation and heat dissipation. CATL Ningde times adopts the most advanced high-precision gluing equipment and manipulator cooperation in the world, which can set the trajectory of gluing, and at the same time monitor the quality of gluing in real time to ensure the quality of gluing, and further improve the consistency of each group of different battery modules.
The gelatinizing process of the electric cell
Build a home for the cell -- end plate and side plate welding
Battery modules are mostly made of aluminum end plates and side plates welded together, laminated and end plates and side plates welded by robots.
Wiring harness isolation plate assembly
After the welding position is accurately located by the welding monitoring system, the material bar code of the wire harness isolation plate is bound to the MES production scheduling management system to generate a separate code for traceability. After coding, the wire harness isolation plate is automatically loaded into the module through the manipulator.
Complete the series and parallel connection of batteries -- laser welding
Through automatic laser welding, the pole is connected with the connecting plate to realize the series and parallel connection of batteries.
An important pass before offline - offline test
Check the full performance of module, including module voltage/resistance, cell voltage, withstand voltage test, insulation resistance test, before going offline. The standardized module design principle can be customized to match different models, and each module can also be installed in the best fit space and predetermined position in the car.
Each battery pack contains a number of cells, integrated with connectors, controllers, and cooling systems, and is wrapped in an aluminum casing. Through the bolt automatic fixation, connected by the electrical connector, even if the failure, only need to replace the single module, do not need to replace the whole battery pack, maintenance workload and risk is greatly reduced, the replacement of the module only need to disassemble the cooling system, no other components involved.
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