Internal information testing method of secondary battery and apparatus

Abstract

The present invention aims to detect the situation of positive electrode in a secondary battery and the situation of a negative electrode therein without disassembling the battery by a simple method. The present invention provides a method for detecting internal information of a secondary battery, comprising a first step for acquiring charge and/or discharge curves inherent in a positive electrode material and a negative electrode material, as reference data, and acquiring charge and/or discharge curves of a detected battery as actually-measured values, a second step for determining charge and/or discharge curves of a positive electrode and a negative electrode therein, using the charge and/or discharge curves inherent in the positive electrode material and inherent in the negative electrode material,; the charge and/or discharge curves of the detected battery as the actually-measured values, and predetermined correction parameters, and a third step for outputting at least one of the charge and/or discharge curves of the positive electrode and the negative electrode and the correction parameter used for calculation, which have been determined at the second step.

Description

technical field [0001] The present invention relates to a detection method of internal information of a secondary battery and a device having the function. Background technique [0002] It is known that secondary batteries (for example, lithium secondary batteries) deteriorate when stored in a high-temperature environment or at a deep charge level, or undergo charge-discharge cycles, resulting in a decrease in capacity. The original battery capacity cannot be restored even if the battery with reduced capacity is fully charged. This reduction in capacity is considered to be due to the reduction of electrode materials contributing to charge and discharge in the positive and negative electrodes, an irreversible chemical reaction at the interface between the electrode material and the electrolyte, and the like. Conventionally, after batteries have been produced, it has been difficult to determine the deterioration factors inside these batteries individually without destruction....

AI Technical Summary

Problems solved by technology

However, even if the degradation rate of the battery as a whole is calculated, it is impossible to determine the conditions of the positive and negative electrodes and irreversible chemical reactions inside the deteriorated battery, and there is a problem that the scope of application is limited.

On the other hand, in order to determine the conditions of the positive and negative electrodes and the irreversible chemical reactions inside the battery, it is necessary to disassemble the battery, and there is a problem that the battery cannot continue to be used.

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