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Internal fault triggering device for simulating internal fault of lithium battery, test method and application

A technology of internal faults and triggering devices, which is applied in the direction of measuring devices, measuring electricity, and measuring electrical variables, etc., can solve the problems that the actual situation of the internal faults of the battery cannot be accurately simulated, the mechanical strength of the battery shell is damaged, and it is difficult to repeat. Remove the heat transfer process, trigger quickly, and have good repeatability

Pending Publication Date: 2021-04-20
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned internal short-circuit fault simulation methods are all based on external force or need to disassemble the battery, which not only destroys the mechanical strength of the battery casing but also introduces external gas, which cannot accurately simulate the actual situation of the internal fault of the battery; at the same time, the internal fault caused by the above test method There is randomness in the type, position, and size of the object, and it is difficult to repeat

Method used

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  • Internal fault triggering device for simulating internal fault of lithium battery, test method and application
  • Internal fault triggering device for simulating internal fault of lithium battery, test method and application
  • Internal fault triggering device for simulating internal fault of lithium battery, test method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In the aluminum shell lithium-ion battery cell, the diaphragm in the middle of a pair of positive and negative electrodes has a hole, the hole diameter is about 10mm, and a layer of 15mm×15mm low shrinkage temperature diaphragm is covered on it, and a heating wire is placed on the diaphragm, and Lead the heating wire through the negative pole and the special port (the rest of the pole pieces are made normally). The cathode material used is LiCoO 2 , the negative electrode is graphite, the grade of the diaphragm is Celgard 2325, and the test device is shown in figure 1 and figure 2 . figure 2 The middle (+) represents the positive power supply of the heating wire, and the (-) represents the negative power supply of the heating wire. The internal temperature control is controlled by the power supply of the heating wire. Fully charge the battery cell, and when it is necessary to trigger an internal fault, heat the heating wire to a temperature of 55°C to shrink the low-...

Embodiment 2

[0046] The diaphragm in the above test device was changed to a ceramic diaphragm produced by Celgard Company, and other test methods were the same as in Example 1. During the test, the cell did not explode, the battery surface temperature reached a maximum of about 66°C, and the battery voltage gradually decreased to 1.5V within 60 hours. It shows that the separator has higher safety.

Embodiment 3

[0048] Change the cathode material in the above test device to LiFePO 4 , other test methods are the same as in Example 1. During the test, the cell did not explode, the surface temperature of the battery reached a maximum of about 59°C, and the battery voltage gradually decreased to 1.3V within 60 hours. It shows that the positive electrode material compared with LiCoO 2 With higher security.

[0049] The internal fault triggering device for simulating internal faults of lithium batteries of the present invention can not only evaluate the safety of batteries of different systems, but also improve and evaluate batteries with poor safety in a targeted manner, such as improving diaphragms or positive electrode materials, Negative electrode materials are improved.

[0050] In summary, the present invention introduces the low-temperature heat-shrinkable film and the electric heating wire into the battery system, and the low-temperature heat-shrinkable film is shrunk by means of...

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Abstract

The invention discloses an internal fault triggering device for simulating an internal fault of a lithium battery, a test method and application. The internal fault triggering device comprises a negative plate, an electric heating element, a first diaphragm, a second diaphragm and a positive plate which are sequentially stacked and assembled; the first diaphragm is provided with a through hole, the second diaphragm can completely cover and shield the through hole, the second diaphragm adopts a low-temperature thermal shrinkage diaphragm, and the thermal shrinkage temperature of the second diaphragm is not higher than 55DEG C. According to the method, the low-temperature thermal shrinkage film and the electric heating wire are introduced into the battery system, the low-temperature thermal shrinkage film is shrunk through an electric heating method, so that the positive electrode and the negative electrode of the triggering device are contacted to generate short circuit, and the method has no mechanical damage to the lithium ion battery structure, is precise in control and good in repeatability, and can effectively and accurately simulate internal faults of the lithium battery. According to the internal fault triggering device for simulating the internal fault of the lithium battery, the safety of the battery can be evaluated, and the battery with poor safety can be improved in a targeted manner.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to an internal fault trigger device for simulating internal faults of lithium batteries, a test method and application. Background technique [0002] At present, lithium-ion batteries have been widely used in the fields of 3C, energy storage batteries and power batteries, but their safety has always been a concern of people. From the analysis of lithium-ion battery safety accidents in recent years, internal short-circuit is one of the important factors that cause lithium-ion battery safety problems. The fire accident of the power battery pack of Boeing 787 passenger plane and the explosion accident of Samsung Note7 mobile phone battery are all caused by internal short-circuit faults. cause. Therefore, it is particularly important to develop a method that can accurately simulate battery internal faults to evaluate the safety of battery products. [0003] Currently commonly used lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/3842
Inventor 白羽刘亚利杨波凌玉袁怒安
Owner SHANGHAI INST OF SPACE POWER SOURCES
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