Single-core structure of lithium battery, core assembly and core module

Abstract

The invention discloses a single-core structure of a lithium battery, a core assembly and a core module. In the single-core structure, a metal tray coats a core, a gap is formed between a transfer metal block and an insulation device, and the transfer metal block can be arranged relative to the insulation device in a floating way. In the core assembly structure, the installation sequence is from a positive side press plate to a plurality of single cores to an intermediate press plate to a plurality of single cores to a negative side press plate. In the core module structure, a plurality of core assemblies are connected by connection copper bars, and a module protection cover covers the tops of the plurality of core assemblies. By the single-core structure, the core assembly and the core module, consistency control on the thickness size and pre-stress control of the core are achieved; for different core thicknesses, only a few parts are needed to replace so as to achieve installation, and the flexibility of manufacturing and assembly is improved; with the design of a connection system and the characteristic of a soft-package core tab, floating installation of a transfer aluminum block is achieved; and by a connection process, the contact resistance is controlled, and the connection quality of site replace is ensured.

Description

technical field [0001] The present invention relates to the technical field of a lithium battery, in particular to a single cell structure of a lithium battery, a cell group and a cell module. Background technique [0002] During the storage and use of the soft-pack laminated lithium battery, problems such as deformation and inflation will occur. If the shape is not controlled, the internal diaphragm gap of the battery will increase, resulting in an increase in the internal resistance of the battery, which will affect the quality of the battery. consistency and service life. For problems such as battery inflation and deformation, the traditional PACK technology adopts the method of stacking multiple batteries and applying pre-pressure as a whole. In order to reduce the connection resistance when the cells are connected in series and parallel as much as possible, a welding process is usually used to weld the tabs of the cells that need to be connected in series and parallel ...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes a lithium battery cell structure, cell group and cell module to solve the pre-pressure control and thickness and dimension consistency control of the pouch battery cell, and at the same time realize the battery cell. Replacement, and the connection during replacement to maintain low contact resistance, while achieving conduction heat dissipation and uniform cell surface temperature

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