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Battery protection circuit with micro-short-circuit detection

A technology for protecting circuits and batteries, applied in battery circuit devices, safety/protection circuits, and secondary battery repair/maintenance, etc., can solve the problem of not supporting micro-short-circuit detection, and achieve the effect of improving safety

Active Publication Date: 2019-10-15
NANJING ZGMICRO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional chips do not prohibit charging and discharging at the same time, and do not support micro-short circuit detection

Method used

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  • Battery protection circuit with micro-short-circuit detection
  • Battery protection circuit with micro-short-circuit detection

Examples

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Embodiment Construction

[0011] The detailed description of the present invention directly or indirectly simulates the operation of the technical solution of the present invention mainly through programs, steps, logic blocks, processes or other symbolic descriptions. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. Rather, the invention may be practiced without these specific details. These descriptions and representations herein are used by those skilled in the art to effectively convey the substance of their work to others skilled in the art. In other words, for the purpose of avoiding obscuring the present invention, well-known methods and procedures have not been described in detail since they have been readily understood.

[0012] Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the pres...

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Abstract

The invention discloses a battery protection circuit. The battery protection circuit comprises: a control circuit; a switch combination comprising a charge switch and a discharge switch; a voltage analog-digital converter configured to sample a battery cell voltage and convert the sampled battery cell voltage into a digital signal DV of the voltage; a current analog-to-digital converter configuredto sample a battery cell current to obtain a current sampling voltage, and convert the sampled current sampling voltage into a digital signal DI of the current; and a microprocessor used for obtaining a first voltage difference value [delta]V1 by subtracting the digital signals DV of two adjacent voltages, obtaining a second voltage difference value [delta]V2 by multiplying the digital signal DIof the current by a preset battery cell internal resistance RI, obtaining a third voltage difference value [delta]V3 by subtracting the first voltage difference value from the second voltage difference value (namely [delta]V1-[delta]V2) and determining whether it is required to control that the charging switch and the discharging switch are in open-circuit states or not through the control circuitbased on the third voltage difference value [delta]V3. Therefore, the battery protection circuit can perform micro-short-circuit detection so as to improve the battery safety.

Description

【Technical field】 [0001] The invention belongs to the field of circuit design, in particular to a battery protection circuit with micro-short circuit detection. 【Background technique】 [0002] As the battery cell of the lithium battery ages, an internal micro-short circuit may occur, and this micro-short circuit occurs inside the battery cell. Generally, it is caused by the deposition of lithium metal on the negative electrode of the battery cell, which gradually accumulates and eventually leads to contact with the positive electrode of the battery cell. Severe micro-short circuit may cause fire or explosion, bringing safety issues. By monitoring the micro-short circuit, the safety of the battery can be improved. In the battery protection circuit, this kind of micro-short circuit detection circuit can be integrated, which will improve the better battery protection function. [0003] figure 1 It is a battery protection chip in the prior art, including overcharge detection...

Claims

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Application Information

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IPC IPC(8): H02J7/00H01M10/42G01R31/02G01R31/3842
CPCH02J7/0029G01R31/3842H01M10/4257H01M2010/4271H02J7/00304H02J7/00306H02J7/00302G01R31/50Y02E60/10
Inventor 王钊
Owner NANJING ZGMICRO CO LTD
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