Battery cell and battery module

Abstract

The invention relates to the technical field of batteries, in particular to a battery cell and a battery module. The electric core comprises a conductive shell, a core body and a cover plate, the top of the conductive shell is provided with a top opening, the bottom of the conductive shell is provided with a shell bottom wall, the cover plate covers the top opening of the conductive shell in a sealing mode, the core body is arranged in the conductive shell, the electric core further comprises a positive electrode collector plate and a negative electrode collector plate, and the top end of the core body is provided with a negative electrode lug; a collector plate tailor-welding hole is formed in the bottom wall of the shell, the positive collector plate comprises a welding column and an annular plate body, the annular plate body is conductively connected with the positive tab, and the welding column extends into the collector plate tailor-welding hole and is fixed with the conductive shell in a tailor-welding manner; the bottom end face of the welding column is located in the flow collecting disc tailor-welding hole or is flush with the outer side face of the bottom wall of the shell. According to the battery cell, the problems of weld penetration, pseudo soldering and poor air tightness which are easy to occur when the conductive shell and the positive collector plate are welded by adopting a laser penetration welding process in the prior art are effectively avoided, and the welding yield is improved.

Description

technical field [0001] The present invention relates to the technical field of batteries, in particular to a battery cell and a battery module. Background technique [0002] The full-tab large cylindrical lithium-ion battery has the advantages of high safety, low heat production, low cost, stable structure, low battery internal resistance, high energy density and power density, and its performance can be compared with blade batteries. Manufacturers have begun to develop new technical processes for full-tab large cylindrical lithium-ion batteries, striving to solve various problems in the structural production process, and open up new directions for their respective planning and layout. [0003] The Chinese utility model patent with the authorization announcement number CN214043927U discloses a single battery, the single battery includes a casing and a cover plate, one end of the casing is open, the other end is closed, and the cover plate cover is provided at the open end. ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a battery cell to solve the technical problems of weld penetration, virtual welding, and poor airtightness when the collector plate and the conductive shell are welded.

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