Method and device for restraining and preventing thermal runaway of lithium ion battery

A lithium-ion battery, thermal runaway technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as unsatisfactory fire extinguishing efficiency, ozone layer destruction, etc., to suppress thermal runaway of batteries and expand spraying range , the effect of inhibiting exothermic side reactions

Inactive Publication Date: 2015-09-02
湖北长海新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

R-123 is often used as a refrigerant for air conditioners, refrigerators and other electrical appliances, but the fire extinguishing effect is not ideal. Moreover, R-123 is a greenhouse gas and can also damage the ozone layer. Therefore, some countries have begun to restrict its use

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  • Method and device for restraining and preventing thermal runaway of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0043] Example 1: It is the basic embodiment of the method for suppressing and preventing thermal runaway of lithium-ion batteries in the present invention. The method is to use liquid inert gas to spray and refrigerate the faulty lithium-ion battery and extinguish the fire, and the steps include:

[0044] A. Select the timing of spraying: when the battery cell reaches a certain temperature, the spraying device is turned on;

[0045] B. Determine the spraying amount of the spraying gas: with the latent heat of vaporization of the liquid inert gas, the latent heat of vaporization of the liquid inert gas is 0.1 to 10 times the heat release of the thermal runaway of the battery cell;

[0046] C. Determine the spraying method: the spraying method is continuous spraying or intermittent spraying, which is selected according to the number of battery cells.

[0047] Said steps are implemented in order of A, spray timing, B, spray amount, and C spray mode, or in parallel, or in reve...

Embodiment 2

[0048] Example 2: It is a further embodiment of embodiment 1. The liquid inert gas is one of liquid nitrogen, liquid argon and liquid carbon dioxide, or two, or a combination of three. In the step A, the spraying device is turned on when the temperature of the battery cell reaches 60° C. to 140° C.

[0049] The spray volume of the liquid inert gas is in liters and is determined by the following formula:

[0050] h=0.1~10 Q / R (1)

[0051] In the formula: h is the liquid inert gas spray amount:

[0052] Q is the thermal runaway heat release of the battery cell;

[0053] R is the latent heat of vaporization per liter of liquid inert gas, which is a known data.

[0054] The thermal runaway heat release Q of the battery cell is determined by the following formula:

[0055] Q=m 1 q 1 + m 2 q 2 +…+ m n q n -----(2)

[0056] In the formula: q is the calorific value of the combustible materials that make up the lithium-ion battery;...

Embodiment 3

[0059] Example 3: is a preferred embodiment. The difference from Example 2 is that the liquid inert gas is selected as liquid nitrogen, and in the step A, the spraying device is turned on when the temperature of the battery cell reaches 120°C. In the B step, the spray amount of the spray gas is determined to be based on the latent heat of vaporization of the liquid inert gas, and the latent heat of vaporization of the liquid inert gas is 0.5 times of the thermal runaway heat release of the battery cell; the battery of the lithium ion battery The active material of the monomer is lithium iron phosphate. The battery cell capacity is 1.5AH. The shape of the battery cell is cylindrical. The liquid inert gas spraying method is continuous spraying once, and the spraying time to the battery cell is 5s. After the spraying, the whole device is turned off. After 10 minutes, the battery temperature is suppressed and tends to be stable, and the battery is intact.

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Abstract

The invention relates to a method and a device for restraining and preventing thermal runaway of a lithium ion battery. According to the method, a liquid inert gas is utilized to perform spraying refrigeration and fire fighting on a faulted lithium ion battery. The method comprises the following steps: A, selecting spraying time; B, determining the spraying quantity of a sprayed gas; C, determining a spraying mode, wherein the spraying mode refers to continuous spraying or interrupted spraying. The device comprises a control cabinet, a storage tank, a main control valve, a secondary control valve, a nozzle, a detector and a safety valve, wherein the control cabinet is a manual button control cabinet or an automatic control cabinet provided with a PLC (Programmable Logic Controller); the detector comprises a temperature sensor used for monitoring the temperature of one or more battery monomers. The method and the device have the advantages that dual effects of refrigeration and fire fighting are achieved, a security mode is complete in functions, stable, safe, reliable and efficient, a vaporization product of the liquid inert gas is nontoxic, environmentally friendly and clean as well as free from secondary damages on battery equipment.

Description

Technical field [0001] The present invention involves suppressing and preventing the thermal control method and device from lithium -ion battery. It is a method and device that suppresses the occurrence of lithium -ion battery thermal discharge and preventing the dissemination of lithium -ion battery packs. Background technique [0002] Lithium ion batteries have the advantages of high voltage, high energy density, long cycle life, good high, high -temperature discharge performance, etc., and their application scope is becoming more and more extensive.However, the potential safety problems of lithium ion batteries in applications have become a bottleneck that restricts its development. Especially for lithium -ion battery packs for power systems. Because of more monomer batteries, its safety issues are more prominent. [0003] Generally, researchers try to improve the reliability of battery materials, improve monomers and module structures, and improve battery peripheral circuit r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCH01M10/4235Y02E60/10
Inventor 王兆聪胡棋威李文斌张华峰裴波
Owner 湖北长海新能源科技有限公司
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