A battery pack equalizing charging circuit and charging method thereof

Abstract

The invention belongs to the technical field of rechargeable batteries, and in particular relates to a balanced charging circuit for a battery pack and a charging method thereof. It discloses a balanced charging circuit for a battery pack, which includes a battery pack composed of a power supply end connected in series with several batteries. The battery pack is connected in series, the two ends of the battery pack are electrically connected to the load, and several control circuits matching the battery are included, the control circuit is connected in parallel with the battery, and the control circuit includes an analog switch module, The information processing module is composed of a battery monitoring module, and the information processing module is electrically connected to the analog switch module and the battery monitoring module respectively. The invention also discloses a battery pack equalization charging method. The invention adopts the combination of pre-charging point, constant current charging and pulse charging to charge the battery pack, so as to quickly eliminate the polarization effect of the battery in the charging process, ensure that each battery can be fully charged, and achieve the balance of the battery purpose of charging.

Description

technical field [0001] The invention belongs to the technical field of rechargeable batteries, and in particular relates to a battery pack equalization charging circuit and a charging method thereof. Background technique [0002] With the increasing popularity of smart devices, especially the extensive use of mobile smart devices, the capacity and charging rate of batteries are getting more and more attention. However, the development of battery charging technology has not changed much. On the one hand, due to the polarization of the battery during charging, the open circuit voltage will be higher than the actual voltage, and the maximum acceptable current of the battery will be reduced. The concentration polarization will be greatly enhanced at the threshold voltage, so the voltage of the battery needs to be limited during charging, so that the polarization will significantly slow down the charging speed of the battery and reduce the charging capacity. On the other hand, s...

AI Technical Summary

Problems solved by technology

However, the development of battery charging technology has not changed much. On the one hand, due to the polarization of the battery during charging, the open circuit voltage will be higher than the actual voltage, and the maximum acceptable current of the battery will be reduced. The concentration polarization will be greatly enhanced at the threshold voltage, so the voltage of the battery needs to be limited during charging, so that the polarization will significantly slow down the charging speed of the battery and reduce the charging capacity

On the other hand, since the polarization of each single cell in the battery pack is different and the parameters of the single cells of the same model and the same batch cannot be completely unified, there will be a single cell in the battery pack when charging. The SOC (charge percentage) of the battery at the same time is inconsistent, resulting in overcharging of the battery with a small capacity, and the battery with a large capacity cannot be fully charged, similar to the wooden barrel effect

Although the charging rate of the existing fast charging technology has begun to increase, it still cannot guarantee that the capacity of all the batteries in the battery pack is fully charged, resulting in the capacity of the battery being unable to be fully charged and reducing the actual capacity.

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