Equalization circuit and equalization method for single cells of lithium-ion battery pack

Abstract

The invention discloses a lithium ion storage battery single battery equalization circuit and an equalization method. The circuit comprises a switch element, an equalization element, and a power dissipation element connected in series; a first single body voltage sampling circuit; a current-limiting control circuit; a first driving circuit; a second single body voltage sampling circuit; a linear control circuit; and a second driving circuit. The current-limiting control circuit outputs control voltage for controlling the work state of the switch element according to sampling voltage of a single battery, the first driving circuit controls the turn-on or turn-off of the switch element according to the control voltage of the current-limiting control circuit, the linear control circuit controls the control voltage for controlling the work state of the equalization element according to the sampling voltage of the single battery, and the second driving circuit controls the work state of the equalization element according to the control voltage of the linear control circuit and controls the single battery in an equalization manner. According to the circuit and the method, the voltage of each single battery of a battery pack is equalized via equalization control, and big difference of performances of single batteries due to inconsistent voltages between single batteries of the battery pack is prevented.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an equalization circuit and an equalization method for single cells of lithium-ion storage battery packs. Background technique [0002] In the field of space power supply, more and more lithium-ion batteries are used for energy storage and power supply. During the use of lithium-ion batteries, battery imbalance must be considered. Battery life and reliability, so battery balance management is an essential key technology for the management of space power lithium-ion battery packs. Along with the use of lithium-ion batteries, various balanced management schemes have also begun to be applied to space power supplies. These equalization management schemes mainly include on-off resistance shunting method, switched capacitor equalization charging, and average battery voltage equalization method, etc. Most of the above equalization management schemes are based on the combination of so...

AI Technical Summary

Problems solved by technology

These equalization management schemes mainly include on-off resistance shunting method, switched capacitor equalization charging, and average battery voltage equalization method, etc. Most of the above equalization management schemes are based on the combination of software and hardware to achieve the purpose of equalization control. Their common characteristics It is a complex circuit structure, difficult to control, and not easy to modularize

Images