Battery cell, battery module and vehicle

Abstract

The invention relates to the technical field of power batteries, and discloses a battery cell, a battery module and a vehicle. The battery cell comprises a metal shell, a naked battery cell and an external tab; the metal shell comprises a packaging shell and a sealing cover, a sealing cavity is defined between the packaging shell and the sealing cover, and connecting positions are arranged at the connecting position between the packaging shell and the sealing cover in the circumferential direction and comprise the first connecting position formed through heat sealing or mucilage glue and the second connecting position formed through welding; a glue part is arranged between the sealing cover at the first connecting position and the packaging shell; the naked battery cell is arranged in the sealing cavity; and one end of the external tab is arranged in the sealing cavity and is electrically connected to the naked battery cell, the other end of the external tab penetrates out of the metal shell, and the external tab is in insulated connection with the metal shell. According to the invention, the directional pressure relief of the battery cell is realized, the occurrence probability of battery cell explosion is reduced, and the safety of the battery module is improved.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a battery cell, a battery module and a vehicle. Background technique [0002] With the explosive growth of new energy vehicles in recent years, current users urgently hope that new energy vehicles can also support fast charging function while ensuring the cruising range (in the SOC range of 10%-80%, charging only takes 15 minutes), To meet these two requirements at the same time, the battery needs to have excellent fast charging capability and heat dissipation capability, high energy density and high group efficiency. [0003] Batteries are mainly divided into three structural types: cylindrical steel case, pouch battery and square metal case. The shell of cylindrical steel-cased cells is a standard size, which is easy to mass-produce and has obvious cost advantages. However, due to the limited capacity of cylindrical steel-cased batteries, a large number of cells are re...

AI Technical Summary

Problems solved by technology

However, due to the material and structural characteristics of the aluminum-plastic composite film, the heat dissipation effect of the pouch cells is poor. Compared with other structural types of batteries, the energy density of the whole package is not much advantage, and the cost is higher

At present, square aluminum shell batteries are more widely used in vehicles. Square battery cells are more popular in the market due to their large battery capacity, high grouping rate, good heat dissipation effect of aluminum shells, and better heat spread control effects. However, square aluminum shells The shell of the battery is directly sealed by welding, and it is easy to explode after a fire in a safety accident, threatening the safety of users, and the safety is poor

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