A method and device for cascading and grouping soft pack batteries

Abstract

The invention discloses a method and device for cascading and grouping soft-packed batteries. The method for cascading and grouping soft-packed batteries includes the following steps: stacking more than two soft-packed batteries along the thickness direction to form a group of soft-packed batteries Set up the soft-packed battery series fixing device at the end of the soft-packed battery cell assembly; bend more than two tabs on the same side of the soft-packed battery cell assembly, and connect them together in parallel in a designed posture. The tab row is formed, and the tab row extends into the welding channel through the tab isolation cavity; through the welding channel, the two opposite tab rows assembled by two adjacent pouch cells are welded, so that the pouch cell The assembly is fixed together in series along the length direction of the pouch cells. The invention can realize that a plurality of soft-packed battery tabs can be converged locally according to the design posture without a bus bar, and a welding port is provided so that the welding direction is perpendicular to the direction of the large surface of the soft-packed battery, so that the soft-packed battery can be realized The series and parallel welding of the pouch cells in the assembly, and reduce the number of welding.

Description

technical field [0001] The present application belongs to the technical field of new energy vehicles, and in particular relates to a method and device for cascading and grouping soft-packed cells. Background technique [0002] With the continuous popularization of new energy vehicles, the requirements for the use of power batteries in new energy vehicles are becoming higher and higher. The high battery life of new energy vehicles is the basic demand of consumers, and improving the specific energy of the power battery is the key to improving the battery life of the whole vehicle. For common new energy vehicles, the power battery pack exceeds 1m in both the length and width directions. At present, the length of the battery module on the market is generally about 0.3m to 0.6m, so multiple batteries need to be set in the power battery pack. module. [0003] When the power battery soft-packed cells are grouped into modules, the tabs of the soft-packed cells are often welded tog...

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Problems solved by technology

[0005] 2. After the tabs and busbars are welded, the soft-packed batteries are arranged on one side of the busbar surface, and the soft-packed batteries can no longer be arranged on the other side of the busbar, which greatly limits the layout of the soft-packed batteries integrated into the module. Flexibility restricts the large-scale integration of modules;

[0006] 3. When welding the tabs, it is necessary to weld the tabs of a group of soft-packed cells multiple times and in multiple places, so that the tabs of each soft-packed cell are welded to the bus bar. The welding time is long and the operation Complicated, thus reducing the production efficiency of power batteries

[0007] In summary, the existing new energy vehicle battery pack method still needs to be improved

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