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A detection method for thermal runaway diffusion inside a battery

A detection method and thermal runaway technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as the difficulty of confirming the position of the internal short circuit, and the difficulty of triggering the position of thermal runaway, so as to achieve the effect of deepening understanding and facilitating experimental research

Active Publication Date: 2021-05-28
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to detect the trigger position of the internal thermal runaway and the location of the internal short circuit in the single battery, and the location of the battery thermal runaway is also different under different abuse methods, making the location and impact of thermal runaway more diverse.

Method used

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  • A detection method for thermal runaway diffusion inside a battery
  • A detection method for thermal runaway diffusion inside a battery
  • A detection method for thermal runaway diffusion inside a battery

Examples

Experimental program
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Embodiment 1

[0038] This embodiment provides a method for detecting thermal runaway diffusion inside a battery. The electrode group is composed of discontinuous positive and negative electrodes and a diaphragm. Make a multi-tab battery, remove the cover to separate the tabs before the thermal runaway abuse test after capacity separation, and then seal with glue. The thermal runaway diffusion and internal short circuit position are judged by the relationship between the thermal runaway position and the pressure drop.

[0039] Step 1), preparation of discontinuous positive electrode sheet, first cut the positive electrode sheet into two parts, the cut-off point is about the length of the outermost circle of the battery, and then use 15 micron thick high-temperature adhesive tape to stick the two parts together, but leave a gap, like image 3 shown. Solder the tabs on the two pieces respectively. After winding, the positive electrodes of different pieces correspond to different positions o...

Embodiment 2

[0045] This embodiment provides a method for detecting thermal runaway diffusion inside a battery, including battery preparation, battery processing, data monitoring, establishment of corresponding relationships and identification of components. The battery preparation includes: the electrode group is composed of discontinuous multi-tab positive electrode sheets, discontinuous negative electrode sheets, and a diaphragm. The electrode group is thus prepared into a multi-sub-tab battery, and the tabs of the single battery are removed before the thermal runaway test, so that the tabs are no longer in contact and sealed with glue. The positive poles of different segments correspond to different positions or layers of the battery (P 1 , P 2 , P 3 ...), through the sub-voltage of different layers or different positions of the single battery (V 1 , V 2 , V 3 ...) detection. Through the relationship between thermal runaway and voltage drop, and the sub-voltage corresponding to t...

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Abstract

The invention relates to a method for detecting thermal runaway diffusion inside a battery, comprising the following steps: step 1), preparing a single battery with multiple tabs; step 2), cutting off the electrical contact between electrode layers in the single battery, Then the single battery is sealed; step 3), establish the corresponding relationship between each electrode layer and the different positions of the single battery, perform a thermal runaway test, and obtain the sub-voltages of each electrode layer respectively; step 4), for The internal thermal runaway diffusion of the battery is judged. In the present invention, the method can be used to detect the internal thermal runaway sequence of the single battery under different abuse conditions, as well as the location of the internal short circuit or micro-short circuit in the battery, to deepen the understanding of battery thermal runaway explosion and heat propagation, and then to target To make improvement measures. The invention is simple and easy to implement, and can realize the detection of a thermal runaway diffusion detection method inside the battery.

Description

technical field [0001] The invention relates to the safety field of lithium ion batteries, in particular to a detection method for thermal runaway diffusion inside the battery. Background technique [0002] With the large-scale application of high-energy-density lithium-ion batteries in automobiles and large-scale energy storage power stations, safety accidents occur from time to time, seriously affecting the further promotion and application of lithium-ion batteries and even threatening people's property and life safety. When the battery is subjected to thermal abuse, electrical abuse, and mechanical abuse, it is prone to thermal runaway and explosion and fire. If the preventive measures are not proper, it is easy to cause the peripheral cells to run out of control, and then cause the spread of thermal runaway at the module and PACK level. Especially large batteries, such as large square, large soft packs and large cylinders, are often difficult to prevent the spread of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/48
CPCH01M10/486Y02E60/10
Inventor 李国华王建涛邵泽超任志敏罗茜史晓岩高可心云凤玲崔义李阿林
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD