Battery module

Abstract

The embodiment of the invention discloses a battery module. The battery module comprises a plurality of battery core assemblies, first conductive sheets, first welding sheets, second conductive sheets and second welding sheets, wherein the plurality of battery core assemblies are sequentially connected in series, the first conductive sheet and the first welding sheet are arranged above each core assembly, the second conductive sheet and the second welding sheet are arranged below each core assembly, each core assembly comprises a plurality of battery cores connected in parallel, the first conductive sheets are arranged above the first welding sheets, a plurality of first through holes are formed on each first conductive sheet and used for placing and positioning the battery cores in the battery core assemblies, a plurality of first opening holes are formed on each first welding sheet, first current limiting parts are arranged in the first opening holes, the second conductive sheets are arranged below the second welding sheets, a plurality of second through holes are formed on each second conductive sheet and used for placing and positioning the battery cores in the battery core assemblies, a plurality of second opening holes are formed on each second welding sheet, and second current limiting parts are arranged in the second opening holes. The battery module disclosed by the invention has high performance, is high in safety and is also relatively low in cost.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a battery module. Background technique [0002] Power battery packs refer to battery equipment that provides mechanical power. At present, power battery packs are widely used in various industries, such as pure electric vehicles, hybrid power devices, plug-in hybrid electric vehicles, ships, rail transit, solar energy, wind power power generation system, etc. Especially with the development of various industries, the performance requirements of battery packs are getting higher and higher. [0003] At present, due to technical limitations such as process materials, the existing power battery capacity is insufficient, and the electromotive force is insufficient. Usually, a battery pack is composed of several cells in a complex series-parallel manner, and the cells are connected together by spot welding. Then several battery packs are connected in series and parallel to form t...

AI Technical Summary

Problems solved by technology

[0003] At present, due to technical limitations such as process materials, the existing power battery capacity is insufficient, and the electromotive force is insufficient. Usually, a battery pack is composed of several cells in a complex series-parallel manner, and the cells are connected together by spot welding. Then several battery packs are connected in series and parallel to form the whole battery module of the battery pack structure. There is a very complicated series-parallel relationship inside the battery pack.

[0004] Existing battery modules with battery pack structures composed of complex series-parallel connections have at least the following problems: First, there is a chain reaction when a single cell fails in the existing battery module, that is, the failure of a single cell may cause the entire battery to fail. The domino effect of the battery module, that is, when a single battery cell is short-circuited, all the parallel-connected cells will be short-circuited, which will detonate the entire battery module, resulting in low safety of the battery module

Furthermore, the above-mentioned battery module has the problem of inconsistency of current load when multiple cells are working, that is, when the above-mentioned battery module is working, some cells will always have a higher load than other cells. The temperature of the battery cells will change more drastically than the temperature of other parts of the battery module. At the same time, because the charge and discharge depth of these cells is always relatively large, the life of these cells will deteriorate, and the battery module determines the performance of the entire battery pack. is its worst cell, resulting in poor performance of the battery module

In addition, the electrical connection design of the above-mentioned battery module is also very complicated, and the processing is also difficult

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