Safety monitoring method for internal diaphragm of lithium-ion power battery

Abstract

The invention discloses a safety monitoring method for an internal diaphragm of a lithium-ion power battery. The safety monitoring method comprises the following steps: testing the internal apparent resistivity of the lithium-ion power battery to obtain the internal resistivity distribution of the lithium-ion power battery; determining an internal temperature field according to the internal resistivity distribution of the lithium-ion power battery and tracking a high temperature variation region; obtaining the change of the stretching quantity of the diaphragm at different temperatures inside the lithium-ion power battery and determining the relation between the internal temperatures and the stretching quantity; determining the stretching quantity of the diaphragm and assessing the internal performance condition of the lithium-ion power battery according to the stretching quantity; locating the damage of the diaphragm and predicting the deformation degree of the diaphragm. The safety monitoring method for the internal diaphragm of the lithium-ion power battery has the advantages that the damage condition of the internal diaphragm is deduced according to the change of the internal apparent resistivity of the lithium-ion power battery, the thermal loss location and the deformation degree prediction on the internal diaphragm of the lithium-ion power battery in a high temperature environment are realized, and the technical bottleneck of the safety monitoring mode of a traditional battery is broken through; besides, the safety monitoring method plays a directing role in research in the fields of life prediction and load control of the lithium-ion power batteries, and new energy resources.

Description

technical field [0001] The invention belongs to the technical field of internal state monitoring of lithium-ion power batteries, and in particular relates to a safety monitoring method for internal diaphragms of lithium-ion power batteries. Background technique [0002] With the prosperity of the economy and the improvement of living standards, people's demand for cars is increasing, and energy conservation and emission reduction and green environmental protection have also begun to attract people's attention and attention. Exhaust gas and noise emitted by a large number of vehicles have caused great pollution to the environment, resulting in poor air quality. Vehicle exhaust emission standards have been continuously upgraded, and the global voice for environmental protection has become increasingly louder. At the same time, the continuous rise in international crude oil prices triggered an energy crisis. Under the background of intensified environmental pollution and energ...

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Problems solved by technology

The patent does not involve the detection of the health status of the internal diaphragm of the power battery

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