Lithium ion battery module management circuit

A lithium-ion battery and management circuit technology, applied in the field of lithium-ion battery module management circuits, can solve the problems of lack of module-level independent protection, no protection control function, battery pack safety problems, etc., to improve overall safety and reliability, Avoid overcharge and overdischarge, low cost effect

CN109787327APending Publication Date: 2019-05-21福建飞毛腿动力科技有限公司
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-05-21

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Abstract

The invention relates to a lithium ion battery module management circuit. The lithium ion battery module management circuit comprises a single chip, a parameter detection circuit, a first field-effecttube driving circuit, a second field-effect tube driving circuit, a first field-effect tube, a second field-effect tube, a fuse and a series battery module, wherein the parameter detection circuit, the first field-effect tube driving circuit and the second field-effect tube driving circuit are connected with the single chip. Besides battery module parameter detection and communication functions,the lithium ion battery module management module has another protection function independent of battery pack systems, so that battery modules can be independently protected, over-charging and over-discharging of the battery modules are avoided, and the battery modules are prevented from being charged and discharged at ultrahigh temperatures or ultralow temperatures; and the structure of the battery module management circuit can be realized by protection switches of the battery modules by adoption of field-effect tubes and the field-effect tubes only need to bear the voltage of the battery modules in specific application, so that low-cost field-effect tubes which resist low voltage and low-pass impedance can be selected, and then good economy and high cost performance are provided.
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Description

technical field

[0001] The invention belongs to the technical field of lithium-ion battery management systems, and in particular relates to a lithium-ion battery module management circuit. Background technique

[0002] With the increasingly widespread application of lithium-ion batteries, more and more lithium-ion batteries are used in power batteries and energy storage systems. The lithium-ion battery packs used in electric vehicle power and large-scale energy storage in the industry are mostly used due to their high voltage. When it reaches 300V or even above 800V, the number of batteries in series is many, often reaching hundreds of strings. Therefore, the circuit structure of the battery pack is often designed in modules. Each module is 6 to 12 batteries in series, and the module will have a Battery management circuit, the function of the management circuit is mainly to monitor the parameters of the battery module and communicate with the external central control unit (a...

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Embodiment Construction

[0019] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0020] The purpose of the present invention is to add two field effect transistors to realize the independent protection function of the battery module in addition to the parameter detection circuit and communication function in the management circuit of the battery module, wherein one field effect transistor is connected in series with the battery, and the other field effect transistor Connected in parallel to the output terminal of the battery module, the single-chip microcomputer controls the on-off of the two field effect transistors respectively through the driving circuit. When the battery module is abnormal, the charging and discharging circuit of the battery module is cut off, and the output terminal is in a bypass conduction state. This not only ensures the safety of the battery module, but also does not affect the work of other n...