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Method and system for early warning thermal runaway state of battery and storage medium

A thermal runaway and battery technology, applied to secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as hazards and inability to judge thermal runaway, and achieve the effect of reducing losses

Active Publication Date: 2022-03-15
ANHUI RNTEC TECH CO LTD
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Problems solved by technology

[0003] At present, the battery management system (Battery Management System, BMS) generally judges by the rapid rise of temperature. When thermal runaway occurs, the battery temperature generally rises slowly. When the battery temperature rises rapidly, the thermal runaway has completely occurred. In this way, it is impossible to judge the early thermal runaway, leading to the occurrence of hazards

Method used

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  • Method and system for early warning thermal runaway state of battery and storage medium
  • Method and system for early warning thermal runaway state of battery and storage medium
  • Method and system for early warning thermal runaway state of battery and storage medium

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Embodiment Construction

[0056] The specific implementation manners of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not intended to limit the embodiments of the present invention.

[0057] figure 1 is a flowchart of a method for early warning of battery thermal runaway state according to an embodiment of the present invention. exist figure 1 , the method can include:

[0058] In step S10, the voltage waveforms of the single cells in the battery pack within a preset time period before the current moment are acquired. Among them, the initial time needs to be determined, and the current time is determined according to a preset time period after the time is determined, and the time period can be set or adjusted according to the actual operating state of the ba...

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Abstract

The embodiment of the invention provides a method and system for pre-warning a thermal runaway state of a battery and a storage medium, and belongs to the technical field of lithium battery thermal runaway pre-warning. The method comprises the following steps: determining a current moment; obtaining a single voltage waveform of a single battery in the battery pack in a preset time period before the current moment; through the above technical scheme, according to the method and system for early warning the thermal runaway state of the battery and the storage medium provided by the invention, the voltage waveform and the temperature waveform of the single battery at the current moment are obtained, the battery voltage difference entropy and the battery temperature difference entropy are calculated, and the thermal runaway entropy value of the battery is calculated through the battery voltage difference entropy and the battery temperature difference entropy; the thermal runaway entropy value of the battery is compared with the preset threshold value to judge whether the battery is in the thermal runaway state or not, and by combining dual judgment of voltage and temperature, the battery can be monitored at the initial stage of thermal runaway and early warning can be given out in time, so that the loss is reduced.

Description

technical field [0001] The invention relates to the technical field of lithium battery thermal runaway early warning, in particular to a method, system and storage medium for early warning of battery thermal runaway state. Background technique [0002] With the rapid development of electric vehicles, lithium batteries have attracted much attention as their mainstream power source. In the case of overcharge, short circuit and heating, lithium batteries are prone to thermal runaway and fire, or even explosion, endangering personal safety. When battery thermal runaway occurs, there is often a rapid rise in battery temperature and a rapid drop in battery cell voltage. [0003] At present, the battery management system (Battery Management System, BMS) generally judges by the rapid rise of temperature. When thermal runaway occurs, the battery temperature will generally rise slowly. When the battery temperature rises rapidly, the thermal runaway has completely occurred. In this w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/48
CPCH01M10/425H01M10/486H01M2010/4271H01M2010/4278Y02T10/70
Inventor 吉祥曾国建杨彦辉许海丽颛孙明明
Owner ANHUI RNTEC TECH CO LTD
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