Symmetrical battery and preparation method thereof

Abstract

The invention discloses a symmetrical battery and a preparation method thereof. The method comprises the steps of: arranging a research electrode, a diaphragm piece, a diaphragm bag equipped with a counter electrode and another research electrode in an aluminum plastic film in order, and injecting symmetrical battery and a preparation method thereof into the aluminum plastic film to manufacture asoft pack battery; charging the soft pack battery to voltage value of an assigned SOC according to an assigned charging rule; and in an specified environment, taking out the diaphragm bag equipped with the counter electrode from the soft pack battery, packaging the soft pack battery to obtain the symmetrical battery with the assigned SOC. The symmetrical battery achieves the regulation of the polepiece SOC to obtain the symmetrical battery with the assigned SOC and reduce the loss of the pole piece.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a symmetrical battery and a preparation method thereof. Background technique [0002] Symmetrical battery is composed of two identical electrodes. It is used for the test of AC impedance method (EIS) to study the internal resistance of the battery. It has the characteristics of high precision and high sensitivity. When testing the electrode impedance, in order to obtain electrodes with different states of charge (State of Charge, SOC), it is necessary to make a large battery first, adjust the required SOC, and then disassemble the battery in a dry environment to obtain Pole pieces, the disassembled pole pieces need to be pre-treated before they can be made into symmetrical batteries; a large battery can only get electrodes with a specific SOC, and the utilization rate of the pole pieces is low. To get pole pieces with different SOC, it must be disassembled Solve large batteries...

AI Technical Summary

Problems solved by technology

[0002] Symmetrical battery is composed of two identical electrodes. It is used for the test of AC impedance method (EIS) to study the internal resistance of the battery. It has the characteristics of high precision and high sensitivity. When testing the electrode impedance, in order to obtain electrodes with different states of charge (State of Charge, SOC), it is necessary to make a large battery first, adjust the required SOC, and then disassemble the battery in a dry environment to obtain Pole pieces, the disassembled pole pieces need to be pre-treated before they can be made into symmetrical batteries; a large battery can only get electrodes with a specific SOC, and the utilization rate of the pole pieces is low. To get pole pieces with different SOC, it must be disassembled Solve large batteries with different SOC; the whole process has high requirements on the operation method and operating environment, otherwise the pole pieces will be damaged, causing problems such as increased impedance and poor consistency of test results

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