Connection structure of flexible-package lithium ion battery module

Abstract

The invention provides a connection structure of a flexible-package lithium ion battery module. The connection structure comprises at least two battery cores and a busbar and also comprises an insulated grid plate, wherein the at least two battery cores are arranged in parallel; the busbar is arranged above the battery cores and electrically connected with tabs of the battery cores; the insulated grid plate is arranged below the busbar and fixedly assembled relative to the battery cores; tab via holes are formed in the insulated grid plate, are corresponding to the tabs of the battery cores and are used for the tabs to pass through; the tops, upwards passing through the tab via holes, of the tabs are provided with bent parts which are bent and are in tight contact with the upper side surface of the insulated grid plate; the busbar is provided with a lower side surface, and the lower side surface is connected onto the bent parts of the tabs in a pressed way and welded and fixedly connected with the bent parts of the tabs. Since the whole busbar is downwards connected onto the bent parts of the tabs in a pressed way, during actual welding and assembling, a corresponding crimping tool is only needed to downwards press the busbar, and the busbar downwards presses the bent parts of the tabs, thus, the problem that a tab crimping tool is required to be additionally arranged is solved, the assembly process of the battery module is effectively simplified, and product cost is reduced.

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...

AI Technical Summary

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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