Apparatus and method for voltage equalizing of monomer battery voltage in lithium batteries

Abstract

The invention relates to a voltage-equalizing method of the voltage of all single cells in the lithium-cell group and a device thereof, the device comprises a box body, a lithium-cell group and an electrical circuit board that is provided with an electronic switch component, an energy-storing element, a sampling electronic switch and a single chip. The electronic switch component consists of a group of electronic switches with one end respectively communicated with an electrode leading pin that is formed by the serial connection of the single cells, and with the other end communicated with a leading pin of a power-storage element and a signal input/output pin of the single chip. The single chip controls the on-off of the electronic switches, executes the voltage sampling of all single cells, closes the corresponding electronic switches as required, takes out and stores the surplus electric power from the single cell with higher voltage into the power-storage element so as to decrease the voltage of the single cell, and transmits the electric power stored in the power-storage element to the single cell with lower voltage so as to increase the voltage of the single cell; under the automatic control of the single chip, the electric power is automatically transferred as required, the voltage of all single cells in the lithium-cell group becomes equal to realize the voltage equalizing, thereby favoring the energy conversation and improving the service life of the lithium-cell group.

Description

technical field [0001] The invention relates to the technical field of power supply voltage stabilization, in particular to a method and device for equalizing the voltage of individual cells in a lithium battery pack. Background technique [0002] Lithium battery packs used in electric bicycles or electric vehicles usually use the method of voltage screening for each single cell to select single cells with the same voltage and assemble them into a lithium battery pack. However, due to the difference in the internal quality of each single battery, in actual use, the voltage of some single batteries often appears too high or too low, which affects the effective working life of the entire lithium battery pack. For this situation, the method of resistive discharge energy consumption is usually used in the prior art, such as the technology disclosed in Chinese Patent No. 02116423.1, which releases part of the energy from the single battery with too high voltage, so that the volta...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method that can not only solve the problem of high voltage of some single cells in the lithium battery pack, but also solve the problem of too low voltage of some single cells, thereby benefiting the lithium battery pack. The method and device for equalizing the voltage of each single battery in a lithium battery pack that the voltage of each single battery tends to be consistent, which is beneficial to prolonging the effective working life of the lithium battery pack

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