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Cooling fire extinguishing device and fire extinguishing method specific to stored lithium ion battery thermal runaway

A technology of lithium ion battery and fire extinguishing device, applied in the direction of battery, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of re-ignition and high internal temperature, achieve low battery damage, good cooling effect, and overcome battery protection single effect

Inactive Publication Date: 2016-11-16
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, researchers often ignore the internal heat accumulation before the thermal runaway of the lithium-ion battery and the role of the internal heat source after the open flame is extinguished. As a result, after the open flame of the lithium-ion battery is extinguished, the internal temperature is often still high, and there is a possibility of re-ignition.
[0006] The existing research results are mainly aimed at a single situation, that is, to suppress the thermal runaway of lithium-ion batteries or to extinguish the fire of lithium-ion batteries, but no device system can have two functions at the same time, that is, early cooling and prevention Lithium-ion battery thermal runaway, later put out the lithium-ion battery thermal runaway fire

Method used

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  • Cooling fire extinguishing device and fire extinguishing method specific to stored lithium ion battery thermal runaway
  • Cooling fire extinguishing device and fire extinguishing method specific to stored lithium ion battery thermal runaway

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Such as figure 1 workflow diagram and figure 2 As shown in the device diagram, a cooling and fire extinguishing device for thermal runaway of lithium-ion batteries in storage is composed of a control part, a water supply device and a liquid nitrogen supply device; the control part is composed of an infrared temperature detector (1), a temperature judgment program (10 ), a control valve (11), a water control valve (2), a liquid nitrogen control valve (9) and connected electrical lines; the water supply device consists of a water storage tank (5), a high-pressure pump (4), a water supply pipe network (12 ) and a fine water mist nozzle (3); the liquid nitrogen supply device is composed of a liquid nitrogen tank (6), a cryopump (7), a liquid nitrogen supply pipe network (13) and a liquid nitrogen nozzle (8); wherein the infrared temperature detection The device (1) receives the temperature signal, and is directly connected to the temperature judging program (10) through t...

Embodiment 2

[0040] The cooling and fire extinguishing device of this embodiment is the same as that of Embodiment 1. If the infrared temperature detector 1 at 0.5m above the nozzle receives the temperature of the lithium-ion battery stored at a does not exceed 80°C, the temperature judgment program 10 makes a judgment within the program. , will not issue any command to the control valve 11.

[0041] If the infrared temperature detector 1 receives the temperature of the lithium-ion battery at place a exceeding 80°C, the temperature signal is judged in the temperature judging program 10, and the temperature judging program 10 issues an instruction to activate the alarm bell 14 for on-site personnel to evacuate. After 1 minute, if the temperature detector 1 detects that the temperature at point a is still greater than 80°C, an instruction is sent to the control valve 11 to activate the liquid nitrogen supply device at 3m above point a and start the liquid nitrogen spraying. All infrared temp...

Embodiment 3

[0043] On the basis of Example 2, after spraying liquid nitrogen at point a for 2 minutes, detector 1 at a distance of 1m above the nozzle received that the temperature at point a exceeded 200°C, and smoke appeared on the scene, and detector 1 transmitted the signal to the temperature judgment program 10 , Program 10 issues an instruction to stop the liquid nitrogen spraying at point a, turn on the fine water mist at point a to prepare for fire extinguishing, and turn on the liquid nitrogen spraying at one adjacent node to cool down, so as to prevent the out-of-control at point a from spreading outward. After spraying for 5 minutes, the temperature at point a dropped below 200°C, but was higher than 80°C, the fine water mist was turned off, the liquid nitrogen spraying at an adjacent node was turned off, and the liquid nitrogen spraying at point a was turned on until the temperature was lower than 80°C. ℃.

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Abstract

The invention relates to a cooling fire extinguishing device specific to stored lithium ion battery thermal runaway. The cooling fire extinguishing device is composed of a control part, a water supply device and a liquid nitrogen supply device. The control part is composed of infrared temperature detectors (1), a temperature judgment program (10), a control valve (11), water control valves (2), liquid nitrogen control valves (9) and an electrical circuit connected with the infrared temperature detectors (1), the temperature judgment program (10), the control valve (11), the water control valves (2) and the liquid nitrogen control valves (9). The water supply device is composed of a water storage tank (5), a high-pressure pump (4), a water supply pipe network (12) and fine water mist spray nozzles (3). The liquid nitrogen supply device is composed of a liquid nitrogen tank (6), a low-temperature pump (7), a liquid nitrogen supply pipe network (13) and liquid nitrogen spray nozzles (8). The cooling fire extinguishing device is mainly suitable for storage places of lithium ion battery packs and can provide safety insurance for application, storage and transportation of lithium ion batteries. The fire extinguishing device can conduct targeted cooling in the initial stage of lithium ion battery pack thermal runaway, and meanwhile, timely fire extinguishment can be conducted after the battery pack is integrally on fire.

Description

technical field [0001] The invention relates to a cooling fire extinguishing device and fire extinguishing method for thermal runaway of lithium-ion batteries in storage, which is mainly used for fire fighting and cooling after thermal runaway of lithium-ion batteries, and can be used to prevent further development and expansion of thermal runaway of lithium-ion batteries. Background technique [0002] The use of electrochemical energy can effectively solve the current problems caused by energy shortage and environmental pollution. Lithium-ion batteries, as an advanced electrochemical energy source, are being favored due to their excellent energy density and good cycle performance. People are paying more and more attention. [0003] At present, research on lithium-ion batteries mainly focuses on safety performance, and the core part of safety performance research lies in the research of battery cycle stability, thermal stability, mechanical stability, and electrochemical sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62C3/16A62C37/00H01M10/42
CPCA62C3/16A62C37/00H01M10/4207H01M2200/10Y02E60/10
Inventor 王志荣江凤伟王昊郭林生
Owner NANJING UNIV OF TECH
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