Lithium battery electric-leakage detection method

Abstract

The invention relates to a lithium battery electric-leakage detection method. The method comprises the steps of: (1) feeding inert gas simultaneously to a cathode and an anode of a battery pack, closing an inlet valve, and detecting a pressure reducing speed in the battery pack; (2) feeding isobaric reaction gas to the anode and the cathode of the battery pack so as to carry out activation on batteries, simultaneously detecting the performance of each single battery, and determining performance uniformity of membrane electrodes in the battery pack; (3) using inert gas to carrying out isobaric pulse purging on the cathode and the anode of the battery pack, totally blowing out residual liquid water of the battery pack, and then carrying out normal temperature detection and heating detection on the battery pack; (4) carrying out three-dimensional simulation on the heating process of lithium batteries, and obtaining a temperature change simulation curve; and (5) carrying out charging and overcharging on the lithium batteries, measuring a temperature changing curve and a voltage change curve, and detecting the overcharge safety performance of the lithium batteries. According to the invention, through the detection of inert gas, the back-flow membrane electrode can be accurately detected, so that the leakage detection efficiency of the membrane electrodes is improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery detection, in particular to a lithium battery leakage detection method. Background technique [0002] Lithium-ion batteries are composed of positive electrodes, negative electrodes, electrolytes, separators and other components. At present, transition metal oxides such as lithium cobalt oxide and lithium nickel cobalt manganese oxide are used for the positive electrode; carbon or graphite and metals are used for the negative electrode; non-aqueous electrolyte is used for the electrolyte; the separator is a porous membrane made of polypropylene and other materials. It is well known that during the charging and discharging process of lithium-ion batteries, the positive and negative electrode materials will react with the electrolyte and generate gas at the same time. When the pressure of the gas reaches a certain level, the battery case will rupture and cause a safety accident. Manufacture ...

AI Technical Summary

Problems solved by technology

It is well known that during the charging and discharging process of lithium-ion batteries, the positive and negative electrode materials will react with the electrolyte and generate gas at the same time. When the pressure of the gas reaches a certain level, the battery case will rupture and cause a safety accident. Manufacture suitable battery cases with a certain compressive strength, but so far, there is no effective, convenient and quick technology to solve this problem