Staggered cell structure of square lithium ion battery

Abstract

The invention provides a staggered battery cell structure of a square lithium ion battery. The staggered battery cell structure comprises a battery cell group, a plurality of heat dissipation gaps are formed in two sides of the battery cell group in a staggered manner; the battery cell group comprises a plurality of single battery cells arranged side by side and an integrated plate arranged at the tops of the single battery cells; every two adjacent single battery cells abut against each other in a staggered manner. The battery cell group is formed by assembling the integrated plate after the plurality of single battery cells abut against each other in a staggered manner, so a plurality of heat dissipation gaps are formed in the two sides of the battery cell group, the specific surface area of the battery cell group is greatly increased, the heat dissipation performance of the battery cell group is remarkably improved, and a better heat dissipation effect can be achieved without arranging a heat dissipation device; moreover, compared with the mode of assembling the single battery cells by adopting a signal acquisition line and a connecting sheet, the connection of the single battery cells by adopting the integrated plate is more stable, the assembly is simple and rapid, the battery cell group does not break down due to looseness in the working process, and the overall safety performance of the battery cell group is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a dislocation cell structure of a square lithium ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, lithium ions intercalate and deintercalate back and forth between the positive electrode and the negative electrode: during the charging process, lithium ions are deintercalated from the positive electrode and embedded in the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the discharge process is opposite to the charging process. [0003] At present, the battery cell structure of lithium-ion batteries on the market is usually a symmetrical structure of positive and negative poles: the explosion-proof valve is set...

AI Technical Summary

Problems solved by technology

[0005] Based on this, the present invention provides a dislocation cell structure of a square lithium-ion battery, which aims to solve the problem of small specific surface area and poor heat dissipation effect after the traditional square lithium-ion battery cell is assembled, especially when the cell pack is large. When the current is discharged, since the heat cannot be dissipated quickly, it is usually necessary to add a heat dissipation device / system between the cells to improve the heat dissipation effect to ensure the normal operation of the cell pack; and the use of connecting pieces and signal acquisition lines during the assembly process will be complicated. The assembly and production process of chemical batteries leads to complex assembly of battery packs and low assembly efficiency. During the working process of batteries, it is easy to cause failures due to loose signal acquisition lines or connecting pieces, which affects the overall safety performance of the battery.

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