Device and method for testing safety of ternary lithium ion battery

Abstract

The invention discloses a device and a method for testing the safety of a ternary lithium ion battery. The testing device comprises a charging and discharging circuit, an external short circuit testing circuit and a direct current reverse voltage circuit; the charging and discharging circuit is used for carrying out charging and discharging circulation on the tested battery; the external short circuit test circuit is used for carrying out short circuit test on the test battery; the direct-current reverse voltage circuit is used for verifying the safety performance and the leakage current of the battery of which the anode and the cathode are disconnected; and the external short circuit test circuit comprises a measuring assembly which is used for measuring and analyzing data of a short circuit test. According to the invention, the fusing voltage of the ternary lithium ion battery can be tested, and the safety performance of the ternary lithium ion battery with Fuse protection design can be known.

Description

technical field [0001] The invention relates to the field of battery stability testing, in particular to a safety testing device and method for a ternary lithium-ion battery. Background technique [0002] Lithium-ion battery, as a chemical battery, is widely sought after for its high stability and high capacity density. Especially with the promotion of new energy vehicles, higher challenges are posed to lithium-ion batteries in terms of battery life and safety. Especially in the pursuit of energy density, the safety issue of ternary lithium-ion is particularly prominent. The fuse structure is designed on the positive connection piece of lithium-ion battery. The negative electrode is a very effective technical invention to improve the safety performance of lithium-ion batteries. However, the safety of the battery cannot be guaranteed 100% after the connection piece is fused. In order to prevent the fault from expanding after the connection piece is fused , To reduce the deg...

AI Technical Summary

Problems solved by technology

Especially in the pursuit of energy density, the safety problem of ternary lithium-ion is particularly prominent. The fuse structure is designed on the positive electrode connection piece of lithium-ion battery. The negative electrode is a very effective technical invention to improve the safety performance of lithium-ion batteries. However, after the connection piece is fused, the safety of the battery cannot be guaranteed 100%. In order to prevent the fault from expanding after the connection piece is fused , to reduce the degree of harm, it is necessary to further test the safety of the ternary lithium-ion battery after the connection piece is fused, so as to provide the basis for subsequent research and development with the relevant data obtained

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