Automatic charging and discharging equilibrium device for battery pack

Abstract

Disclosed is an automatic charging and discharging equilibrium device for a battery pack. A battery switching circuit (1) is connected with a charging and discharging current sensing and signal acquiring circuit (2), a control circuit (5) is connected with the battery switching circuit (1), an equilibrium charging circuit (3) and an equilibrium discharging circuit (4) to control charging and discharging equilibrium parameters of the equilibrium charging circuit (3) and the equilibrium discharging circuit (4), the equilibrium charging circuit (3) and the equilibrium discharging circuit (4) are connected with a battery through the charging and discharging current sensing and signal acquiring circuit (2), the charging and discharging current sensing and signal acquiring circuit (2) is connected with the control circuit (5), and power switch devices of the equilibrium charging circuit (3) and the equilibrium discharging circuit (4) are serially connected with the battery. A voltage signal of a sampling resister (R1) of the charging and discharging current sensing and signal acquiring circuit (2) enters the control circuit (5) to analyze and calculate charging and discharging current, so that PID (proportion integration differentiation) closed-loop equilibrium charging or discharging is controlled.

Description

technical field [0001] The invention relates to a charging and discharging equalization device for a battery pack. technical background [0002] A battery pack is generally composed of multiple single cells connected in series and parallel. The performance of the whole battery pack not only depends on the performance of each single battery in the battery pack, but also depends on the consistency among all the single cells in the battery pack, including the maximum charge and discharge current, the highest energy storage limit, and the service life The main indicators such as safety and safety do not depend on the single battery with the best performance state, but on the single battery with the worst performance state. Therefore, the performance of the battery pack has a "barrel effect". The single battery with poor consistency is the "short board" of the battery pack and becomes the "bottleneck" of the performance of the battery pack. The more single cells that make up the...

AI Technical Summary

Problems solved by technology

In most battery packs, multiple batteries with high and low remaining power often exist at the same time. At present, there are few dedicated equalization devices, and most of them are chargers with only a single charging function, or only a single discharge function of the resistance box, obviously can not achieve the expected equalization effect

Images