The composition of internal resistance of 12V23A battery

　　1. Composition of internal resistance of 12V23A battery

　　Theoretically, as with ohmic resistance (ir), both active and concentration polarization can be understood as the components of battery resistance, in other words, reactive and differential impedance. When building complex mathematical analysis models, the magnitude of active polarization and concentration polarization should be used.

　　Internal impedance consists of

　　1. Ion resistance

　　Electrolyte inside the diaphragm

　　Influencing factors

　　12V23A battery electrolyte conductivity, diaphragm area, thickness, porosity, Gurley index

　　2. The electrolyte inside the positive electrode

　　Influencing factors

　　12V23A battery electrolyte conductivity, positive stage thickness, thin layer thickness, porosity, roughness index

　　3. The electrolyte inside the positive electrode

　　Influencing factors

　　12V23A battery electrolyte conductivity, positive stage thickness, thin layer thickness, porosity, roughness index

　　2. Electronic resistance

　　1. Two electrode active materials

　　Influencing factors

　　Conductivity, thickness, total area

　　2. Current collector (copper foil and aluminum foil)

　　Influencing factors

　　Collect liquid thickness, total width, length, total pinna, and location

　　3. Wires (lugs, poles, inner conductive connecting components)

　　Influencing factors

　　Conductivity

　　3. Resistance of active material and collection liquid

　　Positive chemicals and aluminum platinum

　　Negative chemicals and copper cans

　　Photocatalytic resistance of rechargeable batteries

　　The power level equivalent circuit diagram composed of current characteristic impedance rb, double-layer capacitance cd, electrochemical corrosion resistance rct and its outer diffusion resistance rw is given. Generally speaking, during the entire process of lithium-ion battery placement and sliding cycle system, the rb value conversion is usually not large, but the changes in cd and rct are significant.

　　The characteristic impedance of rechargeable batteries is mainly electrochemical corrosion resistance, but the relative impedance of ohmic characteristics is small. from the chart below. As the temperature decreases, the characteristic impedance of the rechargeable battery increases slowly, then decreases to 0c, the characteristic impedance rate increases, and the trend of negative characteristic impedance is similar.

　　In fact, during the entire cycle of the rechargeable battery, the negative electrode characteristic impedance accounts for a key part of the entire rechargeable battery's characteristic impedance, which is only slightly smaller than the entire rechargeable battery. Therefore, the detection of negative electrode resistance is of great significance in the entire electrical level process.

　　Communication AC internal resistance and DC internal resistance

　　In fact, the DC internal resistance (DCR) of rechargeable batteries is usually detected by communication and exchange methods in enterprises. The IEC standard also requires DC resistance detection of rechargeable batteries.

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