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Identification method of battery micro-short circuit

An identification method and micro-short-circuit technology, which are applied in circuits, secondary batteries, and secondary battery manufacturing, etc., can solve problems such as hidden safety hazards, low reliability, time-consuming and labor-intensive, and achieve the effect of improving safety.

Active Publication Date: 2017-01-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technology usually detects whether the battery has a micro-short circuit by testing the voltage drop after the battery is left for a period of time. This method is not only time-consuming and labor-intensive, but also has low reliability. Identification and detection of micro-short-circuit phenomena may convert micro-short circuits that occur during battery operation into large-scale short-circuit phenomena, causing serious safety hazards

Method used

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  • Identification method of battery micro-short circuit
  • Identification method of battery micro-short circuit
  • Identification method of battery micro-short circuit

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Embodiment Construction

[0057] The method for identifying a battery micro-short circuit provided by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0058] see figure 1 , the first embodiment of the present invention provides a method for identifying a battery micro-short circuit, including:

[0059] S11, provide a parallel battery pack 100, the parallel battery pack 100 includes N parallel branches 110, a positive output terminal 130 and a negative output terminal 140, the N parallel branches 110 all pass through the positive output terminal 130 And the negative output terminal 140 outputs current to the outside, each of the parallel branches 110 includes a battery cell 120, wherein, N>1;

[0060] S12, setting a closed-loop connection conductor 210 in the parallel battery pack 100, the closed-loop connection conductor 210 and each of the parallel branches 110 have a first connection point 211, and the closed-lo...

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Abstract

The present invention can identify whether a micro-short circuit occurs in the parallel battery pack by arranging a connecting conductor with self-balancing effect in the parallel battery pack and detecting the magnitude of the current passing through the connecting conductor during the operation of the parallel battery pack; It further provides a method for judging which battery cell in the parallel battery pack has a micro-short circuit. The method for identifying battery micro-short circuits provided by the invention plays a key role in improving the safety of products using parallel battery packs.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a method for identifying micro-short-circuit phenomena occurring during operation of parallel battery packs. Background technique [0002] In recent years, safety accidents of lithium-ion power batteries have occurred occasionally. Most of the safety problems of lithium-ion power batteries can be controlled or alleviated through external measures such as electrical management or temperature management. However, thermal runaway caused by micro-short circuit is the It is the most difficult and difficult issue among safety issues, which cannot be effectively controlled and alleviated through existing external measures such as electrical management or temperature management. [0003] The so-called micro-short circuit refers to the tiny short-circuit phenomenon that occurs inside the battery cell or between the positive and negative terminals of the battery cell. The in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/48H01M10/04
CPCH01M10/04H01M10/48Y02E60/10Y02P70/50
Inventor 张明轩欧阳明高卢兰光何向明
Owner TSINGHUA UNIV