Battery assembly system, control method, and battery production line

A battery assembly system, comprising:

• a stacking platform, wherein the stacking platform is configured to store trays and battery modules located within the trays;
• an assembly apparatus, wherein one end of the assembly apparatus is connected to one end of the stacking platform via an assembly circulation line, the assembly apparatus is configured to perform assembly action for to-be-assembled battery modules, and the assembly circulation line is configured to transport trays carrying to-be-assembled battery modules to the assembly apparatus;
• and
• a return apparatus, wherein another end of the assembly apparatus is connected to another end of the stacking platform via the return apparatus, and the return apparatus is configured to transport trays carrying assembled battery modules to the stacking platform;
• wherein the return apparatus comprises a diversion apparatus, a first return circulation line, and a second return circulation line;
• wherein a first end of the diversion apparatus is connected to the assembly apparatus via the assembly circulation line, a second end of the diversion apparatus is connected to one end of the stacking platform via the first return circulation line, and a third end of the diversion apparatus is connected to another end of the stacking platform via the second return circulation line;
• and the diversion apparatus is configured to divert trays carrying different types of the assembled battery modules to the corresponding first return circulation line or second return circulation line based on the types of the assembled battery modules.