A method and device for detecting the state of health of a battery

Abstract

The invention provides a method for detecting the state of health of a battery. The method comprises the steps that the internal pressure of the battery is detected; the SOH of the battery is obtained from a corresponding relation generated in advance according to the internal pressure of the battery; the corresponding relation is the corresponding relation between the SOH and the internal pressure of the battery. The invention further provides equipment for detecting the state of health of the battery. According to the technical scheme, the improvement of detection accuracy of the SOH of the battery is achieved.

Description

【Technical field】 [0001] The invention relates to the field of battery detection, in particular to a method and equipment for detecting the health state of a battery. 【Background technique】 [0002] With the maturity of lithium-ion battery technology and the advantages of long cycle life, fast charging and discharging, and good safety performance, lithium-ion batteries are becoming more and more widely used, mainly in the fields of transportation and communication, such as Cars, mobile phones, laptops, etc. [0003] Lithium-ion batteries are used as energy storage units. In actual use, the battery state of health (SOH) of lithium-ion batteries plays an important role in product maintenance, replacement and maintenance. Accurate estimation of battery health status is important for the reasonable application of batteries. very important. [0004] The current method of estimating the state of health of the battery is to establish the correspondence between battery internal re...

AI Technical Summary

Problems solved by technology

[0005] The above method of estimating the state of health of a battery has a certain degree of accuracy for a specific battery, but in many cases the internal resistance of a lithium-ion battery does not change or changes without obvious rules, and the interaction between temperature, current, and batteries during actual use It is more significant, so the error of the SOH value of the battery obtained by this method is very large; at the same time, this method needs to deal with the relationship between internal resistance, SOC, temperature and SOH parameters, so the estimation process is more cumbersome, and the implementation process is relatively Complicated, when the battery is abnormal, it will not be able to give a warning of battery abnormality in time; when the battery is overcharged or overdischarged, the change of SOH cannot be analyzed through internal resistance, but it may give an indication of battery health

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