Lithium battery internal short circuit test method

A technology of internal short circuit and test method, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of inability to comprehensively test the performance of lithium batteries, inability to test safety performance, and affect performance, so as to improve the test effect and practicality. Strong performance, reducing the effect of temperature difference

Inactive Publication Date: 2016-11-16
惠州出入境检验检疫局检验检疫综合技术中心
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  • Abstract
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AI Technical Summary

Problems solved by technology

Using a single blunt needle to squeeze the lithium battery for internal short-circuit test, although the test effect can be achieved, it is found in practice that the performance of the lithium battery cannot be fully tested when the single blunt needle is squeezed for the internal short-circuit test of the lithium battery. certain error of judgment
In addition, because the fixing fixture for fixing the lithium battery cannot heat the lithium battery, the safety performance test of the lithium battery cannot be performed on the lithium battery in different temperature environments. If an external device is used to control the temperature in the test equipment box, the lithium battery There is a fixed fixture between the lithium battery and the box, so that there is a certain temperature difference between the lithium battery and the temperature in the box, which affects the performance

Method used

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  • Lithium battery internal short circuit test method
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  • Lithium battery internal short circuit test method

Examples

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Embodiment 1

[0030] Such as Figure 1 to Figure 6 As shown, a method for testing the internal short circuit of a lithium battery includes a box body 1, a fixing fixture 2 arranged in the box body for placing the lithium battery, an extrusion device 3 arranged in the box body for testing the lithium battery, and a The heat flow circulation device 4 on the side wall of the box and connected to the box, and the controller 5 for controlling the connection of the fixing fixture, the extruding device and the heat flow circulation device. The box body 1 is provided with an air inlet for the external air to enter the box and an air outlet for the heat flow in the box to flow out of the box, and the air flow in the box and the outside are realized through the air inlet and the air outlet. The box is also provided with an observation port for observing the extrusion changes of the lithium battery, and the observation port is sealed by explosion-proof glass to prevent the lithium battery from explodi...

Embodiment 2

[0045] The mechanism of this embodiment is basically the same as that of Embodiment 1, the difference being that the number of extrusion devices in Embodiment 1 is two, and the number of extrusion devices in Embodiment 2 is three, as Figure 7 and Figure 8 shown. When the number of extruding devices is three, there is one extruding device above the fixing fixture, and the extruding device is arranged directly below the fixing fixture; there are two extruding devices below the fixing fixture, and the The extruding device above the fixing jig and the extruding device below the fixing jig are distributed in a Y-shaped structure between the two. The three extrusion devices move synchronously, and other structures and testing methods are the same as those in Example 1, and will not be described again.

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Abstract

A lithium battery internal short circuit test method concretely comprises the following test steps of S1 fixing a lithium battery in a fixing clamp; S2 controlling the temperatures in a box body and in a fixing gauge; S3 using a controller to control an extruding device and simultaneously extruding a lithium battery housing slowly from a plurality of directions; S4 using the controller to acquire the temperature change information, the voltage change information of the lithium battery and the displacement information of a test probe of the extruding device; S5 observing the change of the extruded points of the lithium battery and combining the lithium battery information acquired by the controller to analyze, and determining the safety of the lithium battery. The lithium battery internal short circuit test method of the present invention is strong in practicality and high in test accuracy, can test the internal short circuit working conditions of the lithium battery more comprehensively, enables the test errors and the temperature difference to be reduced and a test effect to be improved, effectively avoids the situation that the test data is not accurate due to the temperature difference between the temperature of the lithium battery and an actual temperature, so that the test and the evaluation of the safety of the lithium battery are influenced, saves the energy consumption, and avoids the situation that the heat energy entering the box body is concentrated relatively to thereby influence the test effect.

Description

technical field [0001] The invention belongs to the technical field of lithium battery testing, and in particular relates to a method for testing the internal short circuit of a lithium battery. Background technique [0002] As a high-efficiency and environmentally friendly power storage medium, lithium batteries have been deeply used in various electronic products, electric tools and transportation facilities. However, with the gradual expansion of its application range, and the volume energy density of a single lithium battery is getting higher and higher, the capacity is getting bigger and bigger, and more and more explosion accidents are more and more prone to occur, and its safety performance is more and more popular. focus on. Therefore, after the lithium battery is produced, it is necessary to carry out internal short circuit tests on the lithium battery, such as extrusion, acupuncture and a series of safety tests to ensure that the lithium battery meets the safety s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3865
Inventor 赵海波郭珩李芹叶长青姜春宝
Owner 惠州出入境检验检疫局检验检疫综合技术中心
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