Causes and characteristics of self-discharge of Ni-MH battery

　　1. Diaphragm

　　① The diaphragm has poor isolation performance, poor tensile strength and poor uniformity

　　② Poor electronic insulation

　　③ Characteristics of diaphragm self-discharge · physical self-discharge or chemical self-discharge · batch occurrence · self-discharge degree close

　　2. Polar plate

　　① Characteristics of self-discharge due to powder drop of pole piece and powder drop of pole piece

　　A. Physical self-discharge

　　B. The whole batch appears

　　C. The degree of self-discharge is close to

　　D. Remove the battery and remove the powder obviously

　　② Winding dislocation

　　3. Collecting fluid

　　① There are burrs in the fluid collection

　　② There is a sharp edge at the welding point of the pole lug

　　③ Self-discharge characteristics of current collector · physical self-discharge · individual occurrence · serious self-discharge degree · occurrence of short circuit battery · inconspicuous removal of battery

　　4. Impurities

　　① Impurities in electrolyte

　　② Impurities in the active material of the electrode plate · self-dissociation of the active material of the positive electrode · self-dissociation of the active material of the negative electrode · self-discharge characteristics of the active material of the electrode plate

　　A. Chemical self-discharge

　　B. The whole batch appears

　　C. The degree of self-discharge is related to the state of charge

　　③ Diaphragm extract

　　④ Impurity self-discharge characteristics · chemical self-discharge · occurrence of the whole batch · self-discharge degree is close to · battery disassembly is not obvious

　　5. Other reasons

　　① External micro short circuit

　　② Conductive substances deposited on the diaphragm

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