A liquid leakage fault diagnosis method suitable for lithium-ion batteries

Abstract

The invention discloses a method for diagnosing liquid leakage faults suitable for lithium-ion batteries, which initializes the diagnostic startup threshold T g , VOC gas concentration threshold T v 、PF 5 Gas concentration threshold T p , time interval Δt and sampling frequency f; real-time monitoring of VOC gas concentration value c v and PF 5 Gas concentration value c p , when the VOC gas concentration value c v are greater than the diagnostic startup threshold T g When, calculate the total concentration value C of VOC gas in the time interval Δt v and PF 5 The total concentration value of the gas C p ;Based on the total concentration of VOC gas C v and VOC gas concentration threshold T v relationship with PF 5 Total gas concentration value C p and PF 5 Gas concentration threshold T p To determine whether the lithium-ion battery is leaking or not. The invention has the characteristics of simple principle, easy realization and easy popularization, can reliably diagnose the leakage fault of the lithium ion battery, provides a good foundation for the protection and further intervention of the leakage fault, and can effectively avoid the lithium battery caused by the leakage fault. Ion battery safety accident.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery safety, in particular to a liquid leakage fault diagnosis method suitable for lithium ion batteries. Background technique [0002] With the continuous promotion and application of lithium-ion batteries, the safety issues of lithium-ion batteries have become prominent. Liquid leakage fault is one of the many faults of lithium-ion batteries. Lithium-ion batteries with unqualified external packaging are prone to liquid leakage failures after frequent bumps. Leakage faults are extremely concealed, which is reflected in the fact that when a liquid leakage fault occurs in a lithium-ion battery, the voltage, current, and temperature signals of the battery cannot show significant changes, so that traditional fault diagnosis methods cannot reliably detect liquid leakage faults. diagnosis. Therefore, it is particularly important to design a diagnostic method suitable for lithium-ion battery l...

AI Technical Summary

Problems solved by technology

For lithium-ion batteries with unqualified external packaging, they are prone to liquid leakage after frequent bumps

Liquid leakage faults are extremely concealed, which is reflected in the fact that when a liquid leakage fault occurs in a lithium-ion battery, the voltage, current, and temperature signals of the battery cannot show significant changes, so that traditional fault diagnosis methods cannot reliably diagnose liquid leakage faults. diagnosis

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