A battery charge equalization device and method

Abstract

The invention provides a battery charging equalization device and a battery charging equalization method. The charging equalization device comprises a battery pack, capacitors, relays, resistors, a first voltage detection module, a second voltage detection module and a controller module. As the capacitors are parallelly connected onto two ends of single batteries, thereby realizing storage of electric energy; voltage of the single battery is detected respectively and on or off of the relay is controlled, thereby realizing whether the batteries and the capacitors are in parallel, equalizing differences between the single batteries and ensuring the equalization of the battery pack; after the battery finishes charging, the capacitor with energy stored already discharges the corresponding single battery, resources are made full use of, the energy utilization rate is high, the on-off times of the relay are few, the loss is little and the temperature rise is little. The whole charging equalization device has a simple structure and low loss. The charging equalization method is relatively simple and easy to realize.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a charge equalization device and method for connecting batteries in series. Background technique [0002] At this stage, the power battery is the main energy source of electric vehicles, and the safe and efficient charging and discharging of the battery is very important for the safe and normal driving of the vehicle. As the most important part of the battery use process, charge and discharge directly affect the battery life and cycle performance. [0003] The battery of an electric vehicle is generally a battery pack composed of multiple single cells connected in series. In actual use, there is always an energy imbalance between the single cells. of inconsistency. The so-called battery inconsistency refers to the differences in parameters such as voltage, internal resistance, and battery state of charge (SOC) among the individual cells in the battery pack. As th...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of the difference between single batteries in the process of charging and discharging, and to avoid energy consumption, the present invention proposes a charging equalization device and method for battery packs, which uses capacitors for energy storage and feedback, and solves the problem of energy loss during battery charging. The problem of large loss and large temperature rise

Images