A single-cell series lithium battery protection circuit

A technology for protecting circuits and lithium batteries, applied in battery overcharge protection, battery circuit devices, battery overcurrent protection, etc.
CN109217410BActive Publication Date: 2021-09-14CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
CHINA RESOURCES MICROELECTRONICS (CHONGQING) CO LTD
Publication Date
2021-09-14

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Abstract

The invention provides a protection circuit for a single-cell series lithium battery, including a battery pack; a detection module with a detection unit for sampling and comparing the voltages of corresponding batteries, and generating a discharge control signal when the sampling voltage is less than a preset minimum voltage; otherwise Generate a charge control signal; a discharge control module connected to the positive pole of the battery and the detection unit is used to generate a discharge shutdown signal according to the discharge control signal; a discharge switch module connected between the discharge control module and the negative terminal of the lowest battery cell is used to The discharge shutdown signal controls the discharge switch module to perform a shutdown operation; the charging control module connected to the positive pole of the battery and the detection unit is used to generate a charging shutdown signal according to the charging control signal; it is connected between the charging control module and the negative terminal of the lowest battery The charging switch module is used to control the charging switch module to perform a shutdown operation according to the charging shutdown signal. The invention solves the problem of many shortcomings in the existing multi-section lithium battery protection chip.
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Description

technical field

[0001] The invention relates to the field of lithium batteries, in particular to a protection circuit for a single-cell series lithium battery. Background technique

[0002] As a new type of energy storage device, lithium batteries are gradually replacing lead-tin batteries due to their excellent charge and discharge performance, high cost performance, and no pollution. They are increasingly used in electric vehicles, electric tools, computers, and backup power supplies. more extensive. Since lithium batteries use chemical reactions to store and release energy, as the usage time increases, the internal resistance of each battery in the same battery pack will vary greatly. If protection measures are not added, the life of lithium batteries will be seriously affected. It may even explode and affect the safety of life and property, so lithium battery protection circuits are very important in lithium battery applications.

[0003] At present, most lithium batte...

Claims

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