battery module

Abstract

The invention discloses a battery module group, which comprises a lower casing; a cell group, which is accommodated in the lower casing, and the cell group includes a plurality of cells; and a top cover, which is sealed and connected to the lower casing, and includes an upper plastic , the lower plastic, and a metal cover plate located between the upper plastic and the lower plastic, wherein the top cover is provided with an explosion-proof valve and a module output pole electrically connected to the battery pack. Compared with the prior art, the battery module of the present invention has the following advantages: 1) safety structures such as flip-flops and explosion-proof valves are arranged on the top cover, and the safety structure of a single battery cell top cover is canceled, which can simplify the process, save costs, and improve Safety performance and energy density; 2) The metal top cover is sealed and connected with the metal lower case, which can meet the requirements of IP67 protection level and realize the integration of battery modules; 3) The battery core is packaged with electrolyte-resistant non-metallic insulating material, which can Save costs, improve the sealing reliability of the module, meet the requirements of insulation and voltage resistance, and enhance the water vapor barrier performance.

Description

technical field [0001] The invention belongs to the technical field of batteries, and more specifically, the invention relates to a battery module. Background technique [0002] At present, the safety performance of traditional battery modules has attracted much attention because it cannot meet the requirements of IP67 protection level. In addition, the battery cell grouping and fixing method is also one of the difficulties in the development of battery modules. [0003] In the related technology, the top cover of a single cell is equipped with safety structures such as explosion-proof valves and flip sheets, and the individual cells are insulated by pasting blue films, and then multiple aluminum shell cells are assembled into a battery module through series-parallel connection. This not only increases the production process and preparation cost, but also reduces the energy density of the battery. [0004] The existing technology usually adopts the method of increasing the...

AI Technical Summary

Problems solved by technology

[0006] However, there are still some problems in the use of aluminum-plastic film for battery cell packaging: the insulation and withstand voltage of the battery core cannot meet the requirements, the sealing reliability of the aluminum-plastic film is low, and it is easy to cause leakage of the battery cell; the side of the aluminum-plastic film packaged tab is To ensure the sealing reliability, it is not allowed to bend the outer sealing edge of the tab, which causes waste of space and reduces the energy density of the battery

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