A battery charging method

Abstract

The invention discloses a battery replenishment method, which comprises the following steps: (1) first adopting the current I min Fully charge the cell, and then use the current I min Discharge the battery cell to get the relationship curve between capacity and open circuit voltage; (2) Then use the voltage testing equipment to measure the open circuit voltage U1 of the battery cell; (3) Then according to the measured open circuit voltage U1, the target open circuit voltage U2 can be directly obtained ; (4) Then according to the open circuit voltage U1 and the target open circuit voltage U2, the corresponding capacity value Q1 and capacity value Q2 can be found from the relationship curve between the capacity and the open circuit voltage in step (1); (5) Then connect the cell to For the charging and discharging machine, the capacity value of the charging cut-off condition ≤ the capacity value Q2-capacity value Q1; (6) Start the charging and discharging machine to charge the battery until the end. The invention improves the accuracy of power replenishment, shortens the power replenishment time, and improves the power replenishment efficiency, but does not occupy too many resources, and can accurately replenish power regardless of the pressure difference.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a method for replenishing battery cells. Background technique [0002] As a medium for storing electrical energy, batteries have been widely used in daily life, such as electric tools, electric vehicles, aerospace and other fields. The battery cell is assembled from outer packaging, positive electrode, negative electrode, diaphragm, and electrolyte. During the process of charging or discharging, due to the influence of ohmic internal resistance and polarization internal resistance, the voltage will appear "falsely high" or "falsely low". When the charging or discharging is over, the voltage will slowly decrease or increase. Until the equilibrium state, so the ohmic internal resistance and polarization internal resistance of the battery affect our precise control of the voltage. However, in practical applications, batteries require a specific voltage value in a specific applic...

AI Technical Summary

Problems solved by technology

At present, when recharging the battery cells, it is generally charged with constant current and constant voltage or discharged with constant current and constant voltage. This recharging strategy takes too long, the efficiency is relatively low, and resources such as charging and discharging machines need to be occupied for a long time.

[0004] When the initial voltage of the cell differs from the voltage value we need by tens of millivolts, and the strategy of constant current and constant voltage is used for charging or discharging, the voltage will be "falsely high" or "inflated" due to the ohmic internal resistance and polarization internal resistance. Virtually low", the cut-off voltage has been reached before charging or discharging, so this method also has disadvantages

Images