Physical description of Thevenin battery model

U: the battery electromotive force, equal to two and the lead dioxide electrode electrode potential difference, and electrolyte concentration.

Ohmic resistance R1: reflects the current ohmic path, including the pole (R_terminal), bus (R_strap), grid (R_grid), grid and paste (R_grid_to_paste) resistance.

Polarization resistance R2: reflects the current electrochemical path, including paste (R_paste), electrolyte (R_electrolyte), diaphragm (R_seperator) resistance.

Polarization capacitance C2: parallel plate and the dielectric material between them constitute a double layer capacitance.

The physical meaning of ohmic resistance

R1 is the internal battery ohmic resistance physical connection resistance, ohmic resistance of the size of the R1 can determine the corrosion condition, disconnection of the battery inside.
When the battery is used for a long time, the internal connecting circuit of the bus, the anode, the pole plate and the like of the battery is seriously corroded, and the pole pole is opened to make the battery.
The final circuit breaker shows an abnormal value of ohmic resistance R1.

The physical meaning of polarization resistance R2

The polarization resistance reflects the state of the battery electrolyte. Overcharge battery polarization resistance significantly higher.
The monitoring of polarization resistance R2 can screen out voltage unbalanced battery. It has important application value in battery screening and battery matching.

Variation of parameters during discharge Variation of parameters during impact