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A pressurized liquid cooling system for suppressing battery thermal instability

A thermal instability and battery technology, applied in the field of lithium batteries, can solve problems such as reducing energy density, achieve the effect of ensuring safety and inhibiting thermal instability chain reaction

Active Publication Date: 2016-02-24
HUATING HEFEI POWER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing technical solutions to thermal instability generally increase the battery spacing or add fillers between batteries, but these solutions will reduce the energy per unit volume or unit mass of the entire battery pack, that is, reduce the energy density, and are not very good Solve the problem of battery thermal instability

Method used

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  • A pressurized liquid cooling system for suppressing battery thermal instability
  • A pressurized liquid cooling system for suppressing battery thermal instability

Examples

Experimental program
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Effect test

Embodiment 1

[0024] like figure 1 Shown is the first structure of this patent, a pressurized liquid cooling system to suppress battery thermal instability, including a liquid cooling system for cooling the battery in the battery box 1, the liquid cooling system includes a liquid storage tank 5. Liquid-cooled pump 7, air-cooled heat exchanger 4 and liquid pipes. The liquid pipes include connecting pipes arranged outside the battery box and cooling pipes 2 arranged between the batteries. The liquid storage tank 5 is connected with a A pressurizer 6, the pressurizer 6 pressurizes the cooling tube 2. The outlet end of the liquid storage tank 5 is connected to the liquid cooling pump 7, and the outlet end of the liquid cooling pump 7 is connected to the inlet end of the cooling pipe 2 arranged between the batteries through the first joint 9; The outlet end is connected to the inlet end of the air-cooled heat exchanger 4 through the second joint 10, and the outlet end of the air-cooled heat exc...

Embodiment 2

[0028] like figure 2 Shown is the second structure of this patent, which is different from the first structure in that the pressurizer 6 and the battery management system BMS8 installed in the battery box for monitoring battery charge, discharge and temperature are connected through cables connected, the pressurizer 6 increases the pressure of the liquid cooling system through the temperature fed back by the battery management system BMS8, so that the cooling tube explodes in time.

[0029] That is, when a local battery generates thermal instability, a large amount of heat will be released in a relatively short period of time, which will eventually lead to a huge difference in the temperature at both ends of the liquid cooling tube entering and leaving the battery module. When the battery management system BMS8 monitors that the temperature is abnormal, it starts the pressurizer 6 to pressurize the liquid in the liquid pipe. At this time, the cooling pipe 2 is deformed due t...

Embodiment 3

[0031] In this embodiment, an 18650 lithium battery pack is used as an example for illustration. The lithium battery pack weighs about 45 g and has 6 identical single cells in total. The comprehensive specific heat capacity of the battery pack has been measured to be about 1000J / kg°C, and the total energy of a single battery 3.7V2.2AH is about 26640J; while the specific heat capacity of the liquid in the liquid cooling system is usually 1000-3000J / kg°C, the highest temperature for normal use of the battery system The temperature is 65°C, and the thermal instability temperature of the battery is 135°C.

[0032]When the thermal instability of a single battery occurs, all the energy is converted into heat, which will cause the temperature to rise by about 102°C. At this time, the average temperature of its adjacent batteries can reach a maximum of 65+102=167°C. Because there is a certain temperature difference in the battery itself, the local temperature of the single battery cor...

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Abstract

The invention provides a pressurizing and liquid-cooling thermal-instability inhibiting system for batteries. The system includes a liquid-cooling system which is used for cooling batteries in a battery case. The liquid-cooling system comprises a liquid storage tank, a liquid cooling pump, a heat-dissipating device and a liquid tube. The liquid pipe includes a connecting tube which is arranged at an exterior of the battery case and a plurality of cooling tubes which are arranged among the batteries. Material of the cooling tube is plastic which has a thermal deformation temperature between a highest usage temperature of the batteries and a thermal-instability temperature of the batteries. The liquid-cooling system is connected to a pressurizer which is used for pressurizing the liquid-cooling system and enables a thermally-deformed cooling tube to explode to carrying out a cooling process to the adjacent batteries, wherein the thermally-deformed cooling tube contacts to a thermally-instabilized battery. Through a pressurization process by the pressurizer, when a battery is thermally-instabilized, a mass of heat is generated to enable the cooling tube to deform and explode. Temperature of the battery and the surrounding batteries is decreased since liquid is sprayed around the batteries. Furthermore, a thermal-instability chain reaction of the batteries is inhibited, thereby ensuring safety of the batteries.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a supercharged liquid cooling system for suppressing battery thermal instability. Background technique [0002] In recent years, due to the increasingly prominent problems of energy costs and environmental pollution, pure electric vehicles and hybrid vehicles have attracted the attention of the government and various automobile companies because of their advantages of greatly eliminating or even zero-emission vehicle exhaust. However, pure electric vehicles and hybrid vehicles There are still many technical problems that need to be solved for power vehicles, and battery thermal instability is one of the most important problems. The safety issue has always been the number one problem in the R&D and production of power lithium-ion batteries. With the frequent reports of battery fires and explosion accidents, the safety issue of power lithium batteries has once again been ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/625H01M10/635
CPCH01M2220/20Y02E60/10
Inventor 李树民袁承超周鹏
Owner HUATING HEFEI POWER TECH
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