Method for determining liquid injection amount of lithium battery

Abstract

The invention discloses a method for determining the liquid injection amount of a lithium battery. The method is characterized in that injection of the lithium battery is divided into primary injection and secondary injection, firstly, experiments on the basis of different primary injection amounts are designed, the suitable primary injection amount is made through determining the amount of produced gas and disassembling the battery to determine the amount of residual electrolyte; experiments are carried out on the basis of different amounts of secondary injection, and the suitable secondary injection amount is made through disassembling the battery to determine the amount of residual electrolyte and determining the amount of subsequent produced gas. The method is advantaged in that the method is simple and convenient to operate, can be applied to different types of batteries, can quickly determine the suitable liquid injection amount of different batteries in a short time, can quicklyand safely formulate the suitable liquid injection amount for power batteries and has a certain practical value.

Description

technical field [0001] The invention relates to the field of lithium battery manufacture, in particular to a method for determining the liquid injection volume of the lithium battery. Background technique [0002] With the large-scale application of lithium batteries, their performance has attracted much attention, especially the vigorous promotion of new energy vehicles, which has directly promoted the development of power lithium batteries, which also put forward higher requirements for the performance of lithium batteries. [0003] Users are most concerned about the performance of lithium batteries, including capacity, life and safety performance, and the amount of liquid injection is inseparable from the above points. Generally speaking, due to the existence of the formation process, lithium batteries include primary liquid injection and secondary liquid injection. If the primary liquid injection is insufficient, it will lead to insufficient formation of the battery and ...

AI Technical Summary

Problems solved by technology

Generally speaking, due to the existence of the formation process, lithium batteries include primary liquid injection and secondary liquid injection. If the primary liquid injection is insufficient, it will lead to insufficient formation of the battery and insufficient gas production, resulting in low battery capacity and easy swelling; Insufficient secondary liquid injection will lead to faster capacity decay and reduced battery life in later use

In addition, whether it is one-time injection or two-time injection, insufficient electrolyte volume is prone to "lithium precipitation" phenomenon, resulting in rapid capacity decay and even safety accidents

However, it is not easy to inject too much liquid. In addition to increasing the weight of the battery itself and reducing the energy density, too much electrolyte will reduce the remaining space inside the battery, resulting in an increase in the internal pressure of the battery and easily causing accidents.