Standing method for soft package lamination lithium ion power battery after liquid injection

Abstract

The invention provides a standing method for a soft package lamination lithium ion power battery after liquid injection. The standing method comprises the following steps of S1, allowing a battery cell after being liquid-injected and pre-sealed to vertically stand for a certain time; S2, vertically fixing the battery cell between two clamping plates, making the battery cell stand for a certain time, and processing the battery cell with intermittent ultrasonic waves during the period, wherein pressure applied to the battery cell by the clamping plates is (0.06-0.09) MPa; S3, adjusting the pressure of a surface of the battery cell to (0.15-0.18) MPa after the standing of the step S2 is ended, and performing high-temperature pre-charging; and S4, reducing the pressure of the surface of the battery cell to (0.05-0.08) MPa after pre-charging is completed, and allowing the battery to stand under a high temperature for a certain time. According to the standing method for the soft package lamination lithium ion power battery after liquid injection, an electrolyte can be uniformly distributed in the battery cell when the clamping plates act on a cell pack main body, and the electrolyte canenter the core pack from different parts; and with the adoption of vertical standing, the standing method is efficient and convenient, and the mass production of the battery cell can be achieved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for shelving a soft-packed laminated lithium-ion power battery after liquid injection. Background technique [0002] The electrochemical performance of lithium-ion batteries is closely related to its manufacturing process. The product quality of lithium-ion batteries depends to a large extent on the process control of its manufacturing process. The infiltration of core packs or electrode groups after liquid injection is one of the most important factors. link. Insufficient infiltration will affect the performance of charge and discharge capacity, increase the internal impedance of the battery cell, and even lead to local lithium precipitation during fast charging, seriously affecting the cycle life and safety performance of the battery cell. [0003] Based on the advantages of high energy density, good cycle performance and high safety performance, flexi...

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a method for shelving a soft-packed laminated lithium-ion power battery after liquid injection, wherein the splint acts on the main body of the core pack to make the electrolyte relatively evenly distributed inside the cell, and the electrolyte can be obtained from different The part enters the inside of the core bag, supplemented by ultrasonic waves to promote the absorption of the electrode piece, which solves the problem of the original vertical circulation and the electrolyte accumulation at the bottom of the core bag and the separation of the electrode diaphragm on the side of the air bag during the standing process. The problem of long time consumption and poor effect caused by the gradual transfer of liquid from the bottom to the entire pole piece

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