Heat-dissipating method of power lithium battery

A heat dissipation method and lithium battery technology, applied to circuits, electrical components, secondary batteries, etc., can solve the problems of inconvenient maintenance, high cost, and poor effect, and achieve the effects of convenient maintenance, low production cost, and simple manufacturing process

Inactive Publication Date: 2010-01-27
NANJING SHUANGDENG SCI TECH DEV RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of poor heat dissipation, high cost, and inconvenient maintenance in the existing power lithium battery system, and provide

Method used

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  • Heat-dissipating method of power lithium battery
  • Heat-dissipating method of power lithium battery
  • Heat-dissipating method of power lithium battery

Examples

Experimental program
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Effect test

example 1

[0014] 1. Select three 3.2V10Ah lithium-ion battery cells and connect them in parallel to form a 3.2V30Ah battery module A, and make a battery module B in the same way;

[0015] 2. Weigh the heptadecyl carbon wax material and the Al / C composite material with a mass ratio of 78:22, first heat and melt the paraffin, then add the Al / C composite material under high-speed stirring at 880 rpm, and continue stirring for 20 minutes. The obtained phase transition point is paraffin / (Al / C) composite material, and its phase transition point is 49°C;

[0016] 3. According to the experimental test and simulation data, the heat Q released by the battery module A before and after 3C discharge can be obtained dis(cell) , calculate the mass M of the paraffin / (Al / C) composite material according to the aforementioned formula (1) (PCM) , and fill the paraffin / (Al / C) composite material into the gap between the cells of the battery module A according to this mass, see figure 1 , wherein 1 is a lit...

example 2

[0022] According to the expression of Example 1, the difference is that the phase change material is changed to GMB / graphite composite material, wherein the mass ratio of GMB to graphite is 65:35, and the phase transition point is 62.1°C. Graphite was added under high-speed stirring at 850 rpm, and stirring was continued for 45 minutes. In this example, the measured instantaneous temperature of battery module A before and after 3C discharge is 30.7°C and 57.2°C, and the temperature rise is 26.5°C, which is 9.3°C lower than that of battery module B (35.8-26.5=9.3).

[0023] In this example, the mass percentage of GMB and graphite in the phase change material is changed to 60:40, the phase transition point is 55°C, and the temperature rise of the battery before and after discharge is measured to be 24.7°C; the mass percentage of GMB and graphite is changed to 80: 20. The phase transition point is 65°C, and the temperature rise of the battery before and after discharge is measure...

example 3

[0025] Select 24 3.2V10Ah lithium-ion battery cells, and use the "three-in-eight-series" mode to form a 25.6V30Ah battery pack. Referring to the method in Example 1, the paraffin / (Al / C) composite material (mass ratio 83:17) between battery cells, and the GMB / graphite composite material (mass ratio 60:40) described in Example 2 is filled between battery modules, see figure 2 , where 1 is a monomer, 2 is a paraffin / (Al / C) composite material, 3 is a battery module, and 4 is a GMB / graphite composite material. When the battery is discharged at a high current of 12C, when the temperature reaches the phase change point of the paraffin / (Al / C) composite material, the phase change material absorbs the heat released by the monomer, and undergoes a phase change by itself until it is completely transformed into another phase. After the phase change process is complete, the temperature continues to rise, and when it reaches the phase change point of the GMB / graphite composite material, the...

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Abstract

The invention discloses a heat-dissipating method of a power lithium battery, belonging to the technical field of the temperature control of lithium ion battery. In the power lithium battery heat-dissipating method, phase-change materials are filled into a gap inside the lithium ion battery, the phase-change materials are one or two of paraffin/(Al/C) compound material and GMB/graphite compound material, wherein the weight percentage of paraffin and Al/C compound material contained in the paraffin/(Al/C) compound material are respectively 75-100 percent and 0-25 percent, and phase-change points of the paraffin and the Al/C compound material are 15 DEG C-55 DEG C; the weight percentage of GMB and graphite contained in the GMB/graphite compound material are respectively 60-80 percent and 20-40 percent, and phase-change points of the GMB and the graphite are 55 DEG C-65 DEG C. The heat-dissipating method is convenient to operate and maintain, low in cost and used for the heat dissipation of the power lithium battery with high power and fast charge and discharge, has obvious effect and can enhance the working performance and the reliability of the power lithium battery. Experiments show that the heat-dissipating method reduces the temperature rise of the power lithium battery by more than 20 DEG C and has wide application prospect compared with heat-dissipating modes, i.e. the prior battery wind cooling and the like.

Description

technical field [0001] The invention relates to a heat dissipation method for a power lithium battery, which belongs to the technical field of lithium ion batteries. Background technique [0002] Electric vehicle is an advanced means of transportation that is highly efficient, energy-saving and does not pollute the environment. It has become the development trend of the global automobile industry. At the same time, the power battery pack as the heart of electric vehicles is the focus of electric vehicle research. [0003] Power lithium batteries (that is, power lithium-ion batteries or lithium-ion battery packs) are ideal power sources for electric vehicles. The high power and fast charging and discharging of power lithium batteries are the general trend of the development of electric vehicles. For a battery pack, the higher the charge-discharge rate, the faster its temperature rises, and the temperature has a double impact on the battery: the higher the temperature, the sm...

Claims

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Application Information

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IPC IPC(8): H01M10/50H01M10/613H01M10/617H01M10/625H01M10/659
CPCY02E60/12Y02E60/10
Inventor 陈冰花佘沛亮许谦丁同臣段和勋
Owner NANJING SHUANGDENG SCI TECH DEV RES INST
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