Passive battery thermal regulator, method and management system based on supercooled phase change material

A phase-change material and passive technology, applied in secondary batteries, electrochemical generators, circuits, etc., can solve problems such as non-utilization, inability to absorb heat at high temperature, and achieve the effect of maintaining charge and discharge performance

Active Publication Date: 2022-07-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the scheme adopted, the difference of the "supercooled" phase transition point may not be used, and the temperature of the heat released and the heat absorbed are the same, and the effect of absorbing heat at a high temperature and releasing heat at a low temperature cannot be passively realized based on the physical properties of the material, or the volume near the freezing point and melting point is not used. Significantly changing characteristics work in conjunction with thermal switches

Method used

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  • Passive battery thermal regulator, method and management system based on supercooled phase change material
  • Passive battery thermal regulator, method and management system based on supercooled phase change material
  • Passive battery thermal regulator, method and management system based on supercooled phase change material

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Embodiment 1

[0076] like figure 1 As shown, the embodiment of the present application provides a passive thermal regulator device, which can control the temperature of the battery pack within a reasonable temperature working range by storing and releasing the heat generated by the battery pack 30, It includes the housing 10 , the subcooled phase change module 50 , the auxiliary heat exchange device 20 and the thermal switch device 40 .

[0077] Figure 2A It is shown that when the fins 4013 are fixed on the piston body 4010, figure 1 Side view cross-sectional structure of the device shown. image 3 shown as figure 1 , Figure 2ATop sectional view of the device shown. The battery pack is provided with a battery pack casing 10 formed from a rigid casing constructed of copper or other metal with good thermal conductivity, the purpose of which is to enclose the lithium-ion battery pack and ensure mechanical support for the battery pack and its thermal conduction, while enhancing and The ...

Embodiment 2

[0089] This embodiment provides a passive thermal regulator device, the structure of which is basically the same as that of Embodiment 1, the differences are: Figure 8 As shown, the finned piston 401 in the thermal switch device 40 is changed to a non-finned piston 4011 structure. The design of the fins can increase the heat exchange area and enhance the heat exchange effect, but will reduce the space of the subcooled phase change module 50 . Changing to the piston 4011 without fins can increase the storage space of the supercooled phase change module to store more supercooled phase change modules, which can store more heat, increase the energy storage energy, and prolong the battery heating time.

Embodiment 3

[0091] This embodiment provides a passive thermal regulator device, the structure of which is basically the same as that of the second embodiment, the difference is: Figure 9As shown, the supercooled phase change module 50 is changed to a combination of multilayer phase change energy storage materials 501 . The multi-layer phase change energy storage material 501 may include: phase change materials with supercooling degree, such as sodium thiosulfate pentahydrate layer, sodium acetate trihydrate layer, lithium nitrate trihydrate layer, etc., which are helpful for different solidification-melting batteries The realization of the working temperature control range; phase change materials with large volume changes, such as unsaturated fatty acid (lauric acid) layers, etc., contribute to large changes in volume during the phase change process; phase change materials with large latent heat, such as Organic solid-liquid phase change material (paraffin) layers such as aliphatic hydro...

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Abstract

A passive battery thermal regulator based on a supercooled phase change material, including a phase change module and a thermal switch device. The phase change module includes a phase change material with a certain degree of supercooling in its constituent materials, which can be combined with the charging of the phase change material. The characteristics of volume change, freezing point and melting point are inconsistent in the exothermic process to achieve passive battery temperature management and control; the role of the phase change material with supercooling is: in addition to providing power for the closing and opening process of the thermal switch device based on the volume change, Through the difference between melting point and freezing point, the heat generated by the battery is melted and absorbed at high temperature to keep the battery temperature from continuing to rise, and at low temperature, it solidifies and releases heat to the battery to increase the battery temperature, so as to further control the working temperature of the battery on the basis of the thermal switch device. . The invention utilizes the supercooling phenomenon to absorb heat near the melting point of high temperature and release heat near the freezing point of low temperature, combined with the significant change in volume during melting and solidification, to promote the opening and closing of the thermal switch, and play the role of dual passive control of the upper and lower limits of the battery temperature.

Description

technical field [0001] The invention discloses a battery thermal regulator, in particular to a passive battery thermal regulator based on a supercooled phase change material, which belongs to the field of thermal management of power batteries and energy storage batteries. Background technique [0002] Most of the internal combustion engines of automobiles use gasoline and diesel as fuel. The exhaust gas produced by the combustion is directly discharged into the atmosphere, which will cause environmental pollution. Therefore, our country is now gradually promoting electric vehicles to replace fuel vehicles. However, the temperature of the power battery pack of electric vehicles has always restricted the promotion and use of electric vehicles. Whether it is a traditional lead-acid battery, or the current nickel-metal hydride and lithium-ion batteries, the temperature has a very significant impact on the battery performance. Too high or too low is not conducive to the performan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/615H01M10/625H01M10/659
CPCH01M10/613H01M10/615H01M10/625H01M10/659Y02E60/10
Inventor 巨星王泽旭许瑶李冰辰李凯璇徐超
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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