Method and device for measuring gas production amount in precharge of lithium ion battery

Abstract

The invention discloses a method and a device for measuring the gas production amount in the precharge of a lithium ion battery, wherein the method comprises the following steps: (a) putting a batteryfilled with electrolyte into a container containing liquid, and recording the liquid level position of the liquid in the container; (b) precharging the battery and recording the liquid level positionof the liquid in the container after precharging; and (c) calculating the gas production amount of the battery according to the former and latter liquid level positions. In the step (b), the time ofchange stop of the liquid level positions of the liquid is also recorded. The device comprises the sealed container containing the liquid, and the sealed container comprises a container bottle body and a sealed bottle plug, wherein scales for recording the liquid level position of the liquid are arranged in the container bottle body, and an electric connecting piece connected with the lithium ionbattery to be detected is also arranged on the sealed container. The invention measures the gas production amount of the battery in the precharging process by the simple method and realizes the quantitative analysis to the gas production performance of the electrolyte. The device has simple structure, is easy to realize and can be used for the preference operation of an electrolyte system.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a method and device for measuring gas production during precharging of lithium-ion batteries. Background technique [0002] In the prior art, the lithium-ion battery needs to be precharged in the production and manufacture of the lithium-ion battery. During the pre-charging process of the battery, gas will be generated. These gases are generated during the formation of SEI film on the negative electrode by the electrolyte solvent. The solvent components EC, DMC, EMC, etc. in the electrolyte system are reduced and decomposed at a certain potential. , generating CO 2 、CH 4 Wait for gas. Different solvents produce different gas compositions, and the laws of gas production are also different. The gas generated during battery precharging will have an impact on the electrochemical performance and safety performance of the battery. Therefore, it is of great theoretical and prac...

AI Technical Summary

Problems solved by technology

[0003] At present, the detection of the performance of the electrolyte is mainly carried out by testing the performance of the battery. There is no simple and reasonable method to evaluate the influence of the electrolyte system on the pre-charge gas production

Different electrolyte solvent components have different mechanisms for generating gas during pre-filling to form an SEI film, so batteries using electrolyte systems with different solvent components have different gas production during pre-charging, and the existing technology cannot make a conclusion on this. Accurately measure and analyze

Images