Control method for charging process of rechargeable battery pack

Abstract

The invention relates to a control method for the charging process of a rechargeable battery pack. The method comprises the following steps of: detecting the voltage and the current of each battery in the battery pack and calculating the electric quantity of each battery in the charging process, and when the electric quantities of part of batteries reach a first threshold and the electric quantities of the other batteries do not reach the first threshold, distributing the redundant electric quantities to the batteries the electric quantities of which do not reach the first threshold by the batteries with the electric quantities reaching the first threshold so that the electric quantities of all the batteries in the battery pack are at the same level; wherein a balance current mode is adopted for charging the battery pack. The method can be utilized to prolong the service life of the battery pack, lower the damage rate of the batteries so as to lessen the influence of waste batteries on the biological environment to the lowest.

Description

technical field [0001] The invention relates to the application field of battery technology, in particular to a method for controlling the charging process of a rechargeable battery pack. Background technique [0002] With the continuous development of electronic technology, more and more pure electric vehicles and hybrid vehicles have begun to enter daily life. Current pure electric vehicles and hybrid vehicles generally use energy storage power stations with better energy storage performance for power transfer or lithium battery packs for power supply. Due to various reasons, there will be inconsistency in the battery, so that the performance of the battery pack is troubled and limited by the inconsistency of the energy of the smallest single unit. When discharging, when the battery cell with the lowest energy reaches the lowest voltage, the system must stop discharging to protect the cell, but at this time, there is still some energy in the battery pack that has not been...

AI Technical Summary

Problems solved by technology

Due to various reasons, there will be inconsistency in the battery, so that the performance of the battery pack is troubled and limited by the inconsistency of the smallest single energy.

When discharging, when the battery cell with the lowest energy reaches the lowest voltage, the system must stop discharging to protect the cell, but at this time, there is still some energy in the battery pack that has not been exhausted in other batteries; similarly, When charging, the battery that reaches the highest voltage first prevents other batteries from continuing to charge, so that the entire battery pack cannot be safely and effectively charged with maximum energy

If things go on like this, after repeated cycles, the inconsistency of the battery pack will increase, and eventually the unusable energy space of the battery pack will be very large, seriously affecting the use efficiency of the battery pack and reducing the life of the entire battery pack

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