A connection structure of soft pack lithium-ion battery modules

Abstract

The invention provides a soft-pack lithium-ion battery module connection structure, which includes at least two battery cells arranged in parallel and a bus bar located above the battery cells and electrically connected to the tabs of the battery cells, and also includes a bus bar arranged below the bus bar and connected to the tabs of the battery cells. The electric core is relatively fixedly assembled with an insulating grid, and the insulating grid is provided with tab perforations corresponding to the tabs of the battery for the tabs to pass through, and the tabs go upward through the top of the tab perforations It has a bent portion that is bent close to the upper side of the insulating grid, and the bus bar has a lower side that is crimped on the bent portion of the tab and welded and fixed to the bent portion of the tab. Since the entire busbar is crimped downwards on the bending part of the tab, in the actual welding assembly, it is only necessary to press down the busbar through the corresponding crimping tool, and the busbar will press down on the bend of the tab part, eliminating the need to configure additional lug press-fitting tooling, effectively simplifying the assembly process of the battery module and reducing production costs.

Description

technical field [0001] The invention relates to a soft pack lithium ion battery module connection structure. Background technique [0002] Lithium-ion battery modules include multiple battery cells arranged in series and parallel. In the battery module, the tabs of the battery cells are connected in parallel through bus bars. At present, the tabs and bus bars of the battery cells are mainly realized by mechanical fastening and welding. Among them, the mechanical fastening method will increase the contact resistance at the tab connection, increase the heat generation, and the contact resistance will increase when the temperature and humidity change, which will affect the performance of the battery module and the power system. performance. More and more battery manufacturers are using welding connection instead of mechanical fastening connection to realize the connection between the bus bar and the tab of the battery cell. [0003] A Chinese utility model patent with the aut...

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Problems solved by technology

[0005] The invention provides a soft-packed lithium-ion battery module connection structure to solve the technical problem existing in the prior art that when welding the tabs, it is necessary to additionally set up a press-fitting tool to press the bent part of the tabs on the bus bar

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