Multi-cell serially-connected lithium battery pack equalization and protection system

Abstract

The invention discloses a multi-cell serially-connected lithium battery pack equalization and protection system. The system comprises a lithium battery charge and discharge component, a control module, a charge and discharge switching device and a discharge end abnormality protection circuit, wherein the lithium battery charge and discharge component is used for connecting an external charging power supply into a lithium battery pack for charging and supplying power to a load, the control module is used for being in IIC (inter-integrated circuit) communication with the lithium battery charge and discharge component so as to control the same to be fully charged, the charge and discharge switching device is used for switching on or switching off a charge hoop or a power supply loop of the lithium battery charge and discharge component, and the discharge end abnormality protection circuit is used for detecting discharge overcurrent of a discharge end and sending a discharge end abnormality signal when detecting the discharge overcurrent of the discharge end. Besides, the control module sends an overcorrent protection signal to the charge and discharge switching device according to the discharge end abnormality signal so as to switch off the charge hoop or the power supply loop of the lithium battery charge and discharge component.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a balance and protection system for a multi-series lithium battery pack. Background technique [0002] In recent years, because lithium batteries have many advantages such as stable discharge voltage, low self-discharge rate, long life, no memory effect, small size, and no pollution, they are widely used in testing instruments, digital products, power tools, etc. figure 1 It shows a structural block diagram of a multi-series lithium battery pack system provided by the prior art, including lithium battery charging and discharging components, a control module and a charging and discharging switch device. The control module controls the charging and discharging switch device to connect or disconnect the charging loop or the power supply loop according to the charging or discharging status of the multi-series lithium battery pack system. At present, the following problems still exist i...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a balance and protection system for a multi-series lithium battery pack, which can better solve the problem of abnormal charging and discharging protection or failure caused by overcurrent or even short circuit at the discharge end

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