Method and system for adjusting differential pressure of battery box

Abstract

The invention discloses a battery box differential pressure adjustment method and system. The method comprises: acquiring the voltage value of each battery box in a plurality of battery boxes; calculating the differential pressure between each voltage value and the minimum voltage value among a plurality of voltage values; screening out the battery boxes of which the differential pressures are greater than the preset tolerance from the plurality of battery boxes; obtaining the target voltage of the differential pressure regulation according to the minimum voltage value; and performing discharge on the screened battery boxes for multiple times according to the target voltage, wherein the discharge current and off current of the previous time of discharge are greater than the discharge current and off current of the next time of discharge. According to the invention, the state in which the active materials of batteries are instantaneously activated under high voltage and high current isconsidered, so that the adjusted voltage can be within a reasonable range, thereby solving the problems of being time-consuming, low in efficiency, and repeated in work of voltage regulation.

Description

technical field [0001] The invention relates to the technical field of battery boxes, in particular to a method and system for adjusting the pressure difference of a battery box. Background technique [0002] Lithium batteries are composed of single cells in different series and parallel ways to form a battery box to provide a power source for electric vehicles. However, due to the control of active materials between individual power battery cells during production, the differences in production environment and parameters, the combined battery box will have voltage imbalance. If it is assembled into a power battery without adjustment, it will make the power In the subsequent repeated charge and discharge of the battery, the life of the battery will be greatly affected. [0003] The existing adjustment method is mainly to adjust the voltage according to the normal charge and discharge. Due to the existence of battery active substances, the adjusted voltage is falsely high or...

AI Technical Summary

Problems solved by technology

The method for adjusting the pressure difference of the battery box is to filter the voltage difference between each voltage value and the minimum voltage value among multiple voltage values, and discharge the screened battery box multiple times according to the target voltage to adjust the pressure difference In order to adjust the voltage difference to a reasonable range, taking into account the instantaneous activation state of the battery active material under high voltage and high current, the adjusted voltage can be within a reasonable range, which solves the problem of long time-consuming voltage adjustment, low efficiency, repetitive work problem

Images