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Analysis and test method based on forced internal short circuit of lithium battery

An internal short circuit, analysis and testing technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as fire and explosion, personal and property losses, and the inability to explain the internal short circuit of the battery scientifically, so as to prolong life and improve testing. The effect of precision and efficiency

Active Publication Date: 2018-07-10
湖南领湃科技股份有限公司 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the production and processing of lithium battery cells, impurities such as metal dust and scrap particles that may be introduced may pierce the separator between the positive and negative electrodes and cause internal short circuits, which is a potential hazard in the battery production process.
Existing test equipment cannot scientifically explain the specific situation of the internal short circuit of the battery, let alone present the relationship between the internal short circuit and various factors (such as external pressure, test environment temperature, charging current, etc.)
Therefore, the staff in the industry cannot distinguish and pick out the battery cells with safety hazards in time, and it is easy to cause fire and explosion accidents during the production process or transportation, resulting in personal and property losses.

Method used

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  • Analysis and test method based on forced internal short circuit of lithium battery
  • Analysis and test method based on forced internal short circuit of lithium battery
  • Analysis and test method based on forced internal short circuit of lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A kind of analytical test method 100 based on forced lithium battery internal short circuit, such as figure 1 shown, including:

[0047] Step 110, place the winding core of the lithium battery directly under the pressing device in the airtight box, and connect the winding core to a voltmeter or an ammeter, wherein a metal sheet is arranged between the positive and negative electrodes of the winding core.

[0048] Step 120, through the monitoring terminal located outside the airtight box, adjust the bottom of the pressing device to be in contact with the upper surface of the winding core.

[0049] Step 130, through the monitoring terminal, preset the pressing speed of the pressing device and control the environment adjustment component to adjust the environment condition in the airtight box to the first preset environment condition.

[0050] Step 140, start the voltmeter or ammeter, the pressing device and the thermal imaging detector located in the airtight box.

[00...

Embodiment 2

[0054] On the basis of Example 1, as figure 2 As shown, before step 110, method 100 also includes:

[0055] Step 160, take out the winding core from the shell of the fully charged lithium battery, place the metal sheet between the positive and negative electrodes, and mark the corresponding position of the metal sheet on the surface of the winding core, and then place the winding core Place inside case to restore.

[0056] Step 170, through the monitoring terminal, control the environment adjustment component to adjust the environment condition in the airtight box to the second preset environment condition.

[0057] Mark the surface of the winding core, and put the lithium battery into the airtight box. It is not easy for people to remember which side the metal sheet is placed on because the lithium battery is turned over, so before putting the lithium battery into the airtight box, check the The battery is marked to facilitate subsequent operation in the airtight box.

[...

Embodiment 3

[0060] On the basis of Embodiment 1 or Embodiment 2, the second preset environmental conditions include: the temperature is 20±5°C, and the dew point is not greater than -25°C.

[0061] Setting a suitable environment for the battery first will help to prolong the life of the battery.

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Abstract

The invention relates to an analysis and test method based on forced internal short circuit of a lithium battery. The method comprises that the lithium battery provided with sheet metal is placed below a press-down device in a closed cabinet, different test conditions are controlled to record internal change of the lithium battery, and data is concluded and summarized to analyze concrete relationbetween the forced internal short circuit and related factors. According to the method, the phenomenon that impurities including metal dusts and particles may enter in the manufacturing process of anelectrical core is simulated, a thermo-imaging principle is used, and the internal short circuit process is reflected indirectly; and a monitoring terminal records the conditions and process of the forced internal short circuit, help is provided for conclusion and summarization of the system, and it is ensured that the safety of the battery is protected in the production process.

Description

technical field [0001] The invention relates to the technical field of battery cell safety testing, in particular to an analysis and testing method based on a forced internal short circuit of a lithium battery. Background technique [0002] During the production and processing of lithium battery cells, impurities such as metal dust and scrap particles that may be introduced may pierce the separator between the positive and negative electrodes and cause internal short circuits, which is a potential hazard in the battery production process. Existing test devices cannot scientifically explain the specific situation of the internal short circuit of the battery, let alone present the relationship between the internal short circuit and various factors (such as external pressure, test environment temperature, charging current, etc.). Therefore, the staff in the industry cannot distinguish and pick out the battery cells with safety hazards in time, and it is easy to cause fire and e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36G01R31/02
CPCG01R31/3865G01R31/50
Inventor 阮香良韦水凌欧燕翠梁东建
Owner 湖南领湃科技股份有限公司
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