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Internal short circuit warning detection method for lithium ion rechargeable batteries

A rechargeable battery, lithium ion technology, applied in the field of short circuit early warning detection in lithium ion rechargeable batteries

Active Publication Date: 2016-10-12
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the inventor's search, there is currently no technical solution for internal short circuit detection and early warning of lithium-ion rechargeable batteries in series battery packs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] The present invention is described below in conjunction with embodiment.

[0017] The internal short circuit of the battery refers to the situation where the internal insulation structure of the lithium-ion rechargeable battery is damaged and a short circuit occurs. Monitor the battery voltage, alarm in time when an internal short circuit is found, and remind the host system to take measures to reduce hazards before deflagration occurs.

[0018] The inventor believes that the internal short circuit of the battery generally occurs during the charging process. Due to the insulation degradation when the internal electric field of the battery gradually becomes stronger, a sudden change is triggered to cause the internal short circuit to occur; Small, so it's not easy to trigger mutations. The present invention is applicable to the case of series battery packs, while only performing internal short-circuit characteristic monitoring during charging. In a battery pack that ma...

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PUM

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Abstract

The invention discloses an internal short circuit warning detection method for lithium ion rechargeable batteries. The internal short circuit warning detection method is characterized by comprising steps of measuring characteristic parameters of each lithium ion rechargeable battery for series connection battery packs with the multiple lithium ion rechargeable batteries in series connection battery pack charging periods to obtain characteristic parameter groups corresponding to the multiple lithium ion rechargeable batteries; determining that battery internal short circuit risks required to be warned occur if the multiple characteristic parameters in the characteristic parameter groups include characteristic parameters larger than or equal to preset upper-limit threshold values and characteristic parameters smaller than or equal to preset lower-limit threshold values. The internal short circuit warning detection method has the advantages that the battery internal short circuit risks are detected, accordingly, the internal short circuit warning detection method is favorable for timely warning, and host systems can be reminded of carrying out treatment for reducing hazards or preventing detonation or preventing the hazards before detonation occurs.

Description

technical field [0001] The invention relates to an anti-deflagration early warning detection technology for a lithium-ion rechargeable battery, in particular to a method for early warning detection of an internal short circuit in a lithium-ion rechargeable battery used in series battery packs, which can be beneficially realized by detecting the risk of a short circuit in the battery Timely alarm to remind the host system to take measures to reduce hazards or avoid deflagration or avoid hazards before deflagration occurs. Background technique [0002] Lithium-ion rechargeable batteries have a high energy density and are prone to thermal collapse when an internal short circuit occurs. A heat-expandable diaphragm is added between the insulating layers of the electrodes inside the battery to expand the distance between the electrodes when overheated. Despite such solutions, thermal collapse caused by short circuits within the battery is still the main cause of battery deflagrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/44
CPCH01M10/42H01M10/44H01M10/443Y02E60/10
Inventor 谭磊易新敏王虎
Owner SG MICRO