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Thermal management module for square battery, and preparation method thereof, and battery pack

A prismatic battery, heat management technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of poor shape stability and cycle stability of components, no pre-heating function, reduced service life, etc., to achieve good thermal conductivity and Temperature control function, ensure temperature uniformity, and improve overall performance

Active Publication Date: 2018-06-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solution of the air-cooled thermal management device is also relatively simple, and more consideration is given to the heat dissipation of the battery, but there is a blank in the preheating function of the battery when it is cold started.
Moreover, the prior art has the following problems: (1) the way of forced convection cooling, because no ventilation duct is designed, the effect of cooling and cooling the power battery close to the electronic fan is more significant, but it will be difficult to effectively cool the power battery far away from the electronic fan. Cool down and dissipate heat, which will lead to uneven internal temperature of each battery cell inside the battery box, and the natural convection cooling method cannot efficiently dissipate heat for the power battery; (2) There is no pre-heating function, after the battery is forced to cold start, It will have a serious impact on the service life of the power battery; (3) The air volume entering the battery modules is quite different, and the heat generation and heat dissipation environments of each module are different, resulting in each battery module working at different ambient temperatures, so that the modules The temperature difference between the modules will increase sharply. This temperature difference between modules will cause inconsistency in battery performance, which will eventually affect the performance and life of the entire battery module.
However, the material composition used in the diaphragm is relatively single, and the phase change material is prone to seep out after the phase change material is melted and transformed.
[0009] Therefore, although there are phase change materials used in the prior art for battery thermal management solutions, these battery thermal management materials have low thermal conductivity and poor thermal conductivity, which are likely to cause the following problems:
[0010] 1) When a single battery is overheated, the heat cannot be effectively removed, and it is easy to cause uneven temperature among the single batteries in the battery pack;
[0011] 2) When the temperature of the battery pack continues to rise, it will also cause the temperature of the entire battery pack to exceed the tolerance temperature, which will accelerate the deterioration of the battery module, thereby reducing the service life, and some battery packs may even catch fire or explode, bringing greater safety Hidden danger;
[0012] 3) If the battery pack works at high temperature for a long time, the output power of the battery pack will drop significantly with the increase of temperature, so that the battery pack cannot fully exert its maximum performance
[0013] In addition, these thermal management materials also have problems such as poor flame retardancy, easy combustion, poor shape stability and cycle stability of the components made, and easy leakage on the surface of the components.

Method used

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  • Thermal management module for square battery, and preparation method thereof, and battery pack
  • Thermal management module for square battery, and preparation method thereof, and battery pack
  • Thermal management module for square battery, and preparation method thereof, and battery pack

Examples

Experimental program
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Effect test

preparation example Construction

[0080] In a second aspect, the present invention provides a method for preparing a thermal management module for a prismatic battery according to the first aspect, which includes the following steps:

[0081] (1) paving the thermal management material in the inner cavity of the mold;

[0082] (2) Clamp the mold and place it in an oven for preheating; preferably, when no oil absorbing agent is added to the thermal management material, preheat to a temperature higher than the melting point of the phase change material by 10°C, preferably higher than the melting point of the phase change material Melting point of 10 to 20 ° C. When an oil absorbing agent is added to the thermal management material, it is preheated to 10° C. higher than the melting point of the oil absorbing agent, preferably 10 to 20° C. higher than the melting point of the oil absorbing agent.

[0083] (3) Compression molding;

[0084] (4) After cooling down, the mold is disassembled, the prefabricated block i...

example 1

[0094] (1) Spread a layer of heat management material in the inner cavity of the mold; wherein the components of the heat management material are as shown in Table 1;

[0095] (2) Place the mold in an oven to preheat after closing the mold;

[0096] (3) Compression forming;

[0097] (4) After cooling down, the mold is disassembled, and the prefabricated block is taken out to obtain a thermal management module for a square battery;

[0098] (5) According to figure 1 Assemble the prismatic battery and the thermal management module to obtain a battery pack.

[0099] Examples 2 to 30

[0100] Examples 2 to 30 were performed in the same manner as Example 1 except for the contents shown in Table 1 below. The enthalpy value, phase transition temperature and thermal conductivity of the thermal management material were detected, and the detection results are shown in Table 1.

[0101]

[0102]

[0103] In Table 1: A1 represents alkane type paraffin wax with a melting point of ...

example 31

[0106] Example 31 is basically the same as Example 1, the only difference is that in step (1), a layer of expanded graphite powder is evenly spread on the bottom of the mold cavity; then, the powder of the thermal management material is evenly spread; finally, Spread a layer of expanded graphite powder uniformly again. Thereby, graphite sealing layers 12 are formed on the upper surface and the lower surface of the thermal management material molded body 11 .

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PUM

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Abstract

The invention relates to a thermal management module for a square battery, and a preparation method thereof, and a battery pack. The thermal management module comprises a thermal management material molding body, which is prepared from a thermal management material through a molding method, wherein the thermal management material contains, by mass, 55-90% of a phase change material, 4-20% of a thermal conduction filler, 4-20% of a flame retardant, and 2-10% of chopped fiber. According to the present invention, by adding the chopped fiber, the thermal management module can provide the effectiveenhancing effect, and can greatly increase the phase change material content in the thermal management material so as to improve the heat storage capacity of the thermal management module and stablyregulate and control the temperature.

Description

technical field [0001] The invention relates to the technical field of battery heat management, in particular to a heat management module for a prismatic battery, a preparation method thereof, and a battery pack. Background technique [0002] Batteries such as secondary batteries have been widely used as energy sources for wireless mobile devices, such as power sources for electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, etc., thereby solving problems caused by vehicles using petroleum fuels. issues such as air pollution. Small wireless mobile devices may use one or more battery cells, while medium or large wireless devices such as vehicles may use medium or large battery modules that include multiple battery cells that are electrically connected to each other. Such medium or large battery modules typically A prismatic battery manufactured to have as small a size and weight as possible so as to be stackable with a high degree of integration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/613H01M10/615H01M10/617H01M10/653H01M10/659
CPCH01M10/613H01M10/615H01M10/617H01M10/653H01M10/659Y02E60/10
Inventor 金兆国党广洲张雅倩张靖驰雷雨张天翔
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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