Battery module and busbar welding method thereof

Abstract

The invention relates to a battery module which comprises battery cells which are arranged in the thickness direction of the battery cells to form a battery cell group; busbars are electrically connected with the pole columns of the adjacent battery cells; an electrical isolation plate is arranged above the battery cell group and is used for supporting and fixing the bus bar, a pole column welding position is arranged on the electrical isolation plate, pole columns of the battery cells extend out of the pole column welding position, and the bus bar is welded between the pole columns of the battery cells and is electrically connected with the battery cells. According to the technical scheme provided by the invention, the battery cell pole and the busbar are welded through the contact side surfaces of the battery cell pole and the busbar, so that the phenomenon that the heights of the busbars are inconsistent when the busbars are welded above the battery cell pole is avoided, and necessary reserved space for absorbing tolerance is reduced; meanwhile, the size of the busbar is greatly reduced, the cost is reduced, the mass of the busbar is also greatly reduced, the whole battery module is lighter, and the weight of the battery module is lighter.

Description

technical field [0001] The present disclosure relates to the field of power battery manufacturing, and in particular, to a battery module and a bus bar welding method thereof. Background technique [0002] In recent years, the popularity of electric vehicles has been very extensive. As the battery system that drives electric vehicles, it has the most direct impact on the cruising range of the vehicle, and the main factor affecting the battery system's cruising range is energy density, so reducing zero in a limited space Component and structural optimization are necessary. [0003] The connection of the poles of the battery cells between the traditional modules is through the use of connecting pieces directly above the battery cells, and then through laser welding to fuse the poles of the battery cells and the busbars together. This solution is mature and stable and is now the mainstream. . However, after grouping, due to other factors, such as the size tolerance of plastic...

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Problems solved by technology

However, after grouping, due to other factors, such as the size tolerance of plastic parts and the thickness tolerance of connecting pieces, etc., the overall height of the module may be higher. At this time, it is necessary to design an additional structure to absorb errors. A certain error absorption space reduces the space utilization rate of the battery module; and the busbar used in this solution is large in size, which is not conducive to the lightweight design of the battery module, and the cost of a large-area busbar is also high, which is not conducive to Conducive to cost reduction of battery modules

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