Thorn sheet for simulating short-circuit thermal runaway in lithium-ion battery, sample battery cell and method

A lithium-ion battery, internal short-circuit technology, applied in circuits, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of inability to accurately simulate thermal runaway and dependence of batteries

Inactive Publication Date: 2021-01-08
ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the heat caused by this test method to trigger the thermal runaway of the battery comes from the external heating wire, not the heat caused by the internal short circuit of the battery itself, this test method has certain defects and cannot accurately simulate the real internal short circuit of the battery. thermal runaway
[0005] To sum up, in the prior art, the triggering of the thermal runaway of the battery cell is not caused by the real internal short circuit of the battery cell. Therefore, the evaluation basis is limited, and this evaluation method is very dependent on the knowledge and experience of professional technicians

Method used

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  • Thorn sheet for simulating short-circuit thermal runaway in lithium-ion battery, sample battery cell and method
  • Thorn sheet for simulating short-circuit thermal runaway in lithium-ion battery, sample battery cell and method
  • Thorn sheet for simulating short-circuit thermal runaway in lithium-ion battery, sample battery cell and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]The embodiment of the present invention: such asFigure 1 to Figure 3This embodiment proposes a piercing piece for simulating short-circuit thermal runaway in a lithium ion battery, which includes a metal piece 1 on which at least one pointed corner 2 extending outward is provided; Corner 2 is made of an alloy with temperature memory effect. Specifically, the sharp corner 2 is made of a memory alloy. It should be noted that an alloy with a temperature memory effect means that the shape of the alloy changes when a certain temperature is reached. Simply put, the alloy has one shape at room temperature, and when it reaches a certain high temperature, it will deform into another shape. Specifically, in this embodiment, the sharp corner 2 is located in the same plane as the metal sheet 1 at room temperature, and when the temperature reaches a certain high temperature, the sharp corner 2 will bend toward one side of the diaphragm.

[0036]In practice, the alloy may be a copper-nickel al...

Embodiment 2

[0043]Please refer toFigure 1 to Figure 3This embodiment proposes a sample cell for simulating short-circuit thermal runaway in a lithium-ion battery, which includes the stinger used to simulate short-circuit thermal runaway in a lithium-ion battery as described in Example 1, and also includes a positive electrode sheet 3. Negative plate 4 and separator 5. Specifically, with regard to the production of the sample cell, the production process of the sample cell only consists in adding a spike, which can be implemented by those skilled in the art.

[0044]Specifically, the positive electrode sheet 3, the separator 5, and the negative electrode sheet 4 are stacked in sequence, and the metal sheet 1 is arranged between the positive electrode sheet 3 and the separator 5; and is installed on the metal sheet 1. The sharp corner 2 on the upper side is located between the positive electrode sheet 3 and the separator 5, and the sharp corner 2 is set to be used for piercing after the temperature ...

Embodiment 3

[0048]Please refer toFigure 4 This embodiment proposes a method for simulating short-circuit thermal runaway in a battery, which includes the following steps, S1, attaching the spike as described in Example 1 to the positive electrode plate 3 and placing it on the positive electrode plate 3 and the separator Between 5, the battery is made; in specific implementation, multiple stab pieces can be placed. S2, arranging the temperature sensing wire 7 on the cell made in step S1 to form a sample cell; S3, placing the sample cell in a sealed environmental chamber while monitoring the voltage of the sample cell; S4, environmental protection The chamber is heated to make the temperature of the sample cell reach the deformation temperature of the sharp corner 2; S5, observe the temperature change of each temperature sensing wire 7 on the sample cell until the sample cell heats out of control. During the test, the sample cell is heated. When the heating temperature reaches the deformation tem...

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Abstract

The invention discloses a thorn sheet for simulating short-circuit thermal runaway in a lithium-ion battery, a sample battery cell and a method. The thorn sheet comprises a metal sheet; at least one sharp corner extending outwards is arranged on the metal sheet; the sharp corner is made of alloy with a temperature memory effect; the diameter of the sharp corner is gradually reduced along the direction far away from the metal sheet; one side of the metal sheet is attached to the positive plate of a to-be-tested battery, and the other side of the metal sheet faces a diaphragm between the positive plate and the negative plate of a to-be-tested battery; and the sharp corner is set to be used for puncturing the diaphragm after the temperature of the to-be-tested battery reaches the deformationtemperature of the metal sheet, so that the to-be-tested battery is internally short-circuited. The short-circuit thermal runaway in the lithium-ion battery can be simulated.

Description

Technical field[0001]The invention relates to the technical field of battery testing, in particular to a stinger, a sample cell and a method for simulating short-circuit thermal runaway in a lithium ion battery.Background technique[0002]As the core component of the vehicle, the power battery is related to the safety of the vehicle. For the battery, the biggest maintenance is the thermal runaway of the battery. In severe cases, the battery will naturally or even explode. When the thermal runaway of the battery reaches a certain temperature , Will cause the temperature inside the battery to rise rapidly, the battery is out of control, and then a combustion explosion occurs.[0003]According to the internal structure of the battery, overheating, overcharging, internal short circuit, collision, etc. are the key factors that cause thermal runaway of power battery. A short circuit inside the battery, unreasonable use, manufacturing defects, or exposing the battery to extreme outside tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/382G01R31/392G01R31/36H01M10/058H01M10/0525
CPCG01R31/3644G01R31/382G01R31/392H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 李彬彬徐爱琴秦李伟庞灿
Owner ANHUI JIANGHUAI AUTOMOBILE GRP CORP LTD
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