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Battery pack heat dissipation method for electric automobile

A heat dissipation method and technology for electric vehicles, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of high air outlet temperature, uneven temperature, low temperature, etc., to achieve enhanced heat dissipation effect, simple internal structure, Avoid the effect of internal structure

Inactive Publication Date: 2011-02-02
NANJING SHUANGDENG SCI TECH DEV RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biggest disadvantage of this method is that the local temperature distribution in the battery pack is uneven, and the temperature near the air inlet is often low, while the temperature at the air outlet is high.
This temperature inhomogeneity directly affects the consistency of the single cells in the battery pack, and will accelerate the deterioration of the performance of the battery pack.
Water-cooled or oil-cooled methods, although the heat dissipation effect is better, but the internal structure of the battery pack is complex and the pipelines are densely packed, resulting in a sharp increase in the weight and cost of the battery pack

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take the 360V40Ah Ni-MH battery pack for hybrid electric bus as an example:

[0017] Cut the 3mm thick thermally conductive silicone sheet into small pieces according to the size of the 40Ah Ni-MH battery, paste them on the surface of the battery respectively, and then install the batteries in the battery pack case in turn. Under the environment of 25°C in the laboratory (static test), discharge at 4 rates for 60s. The six temperature measurement points in the battery pack have a maximum temperature of 39°C and a minimum of 37°C. After the battery is packaged into the vehicle, the battery pack will move relative to the air during the driving of the hybrid electric bus (dynamic test), and the heat on the surface of the battery pack will be dissipated quickly. The maximum temperature of the six temperature measurement points in the battery pack is 32°C, the minimum temperature is 31°C, and the outdoor temperature is 23°C.

Embodiment 2

[0019] Take the 144V8Ah lithium iron phosphate battery pack for hybrid electric cars as an example:

[0020] Cut the 0.15mm thick heat-conducting silica gel sheet into small pieces according to the size of the 8Ah lithium iron acid battery, and paste them on the surface of the battery respectively, and then install the battery in the battery pack case in turn, and install an aluminum heat sink outside the case. Static test, 4 rate discharge for 6 minutes. The six temperature measurement points in the battery pack have a maximum temperature of 37°C and a minimum of 34°C. In the dynamic test, the maximum temperature of the six temperature measurement points in the battery pack is 30°C, the minimum temperature is 29°C, and the outdoor temperature is 21°C.

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Abstract

The invention discloses a battery pack heat dissipation method for an electric automobile, belonging to the field of electric automobile power sources. An insulating film with high heat conductivity is filled between one battery and another battery in a battery pack as well as between one battery and a battery pack shell, and the heat produced by the batteries during charging and discharging processes is transferred to the surface of the battery pack shell to be dissipated. The invention overcomes the defects of low forced air-cooling heat dissipation efficiency of the traditional battery pack, non-uniform temperature inside the battery pack and complex interior structure and high cost of the water-cooling or oil-cooling type battery pack. The provided battery pack heat dissipation method has the advantages of simple implementation, low cost and good heat dissipation effect.

Description

technical field [0001] The invention belongs to the field of power sources of electric vehicles, and in particular relates to a heat dissipation method for battery packs used in electric vehicles. Background technique [0002] At present, the technology of electric vehicles is constantly improving, and has been applied in specific occasions such as short-distance low-speed, urban public transport and tourist area traffic. As the power source of electric vehicles, battery packs still have relatively large defects in their performance. Therefore, there is still a long way to go for electric vehicles to be mass-produced with stable quality and standards. [0003] The batteries used in EV battery packs can be lead acid, nickel metal hydride or lithium ion. Due to the high voltage and capacity of the battery pack, hundreds or thousands of single batteries need to be used in series and parallel to meet the usage requirements. During the charging and discharging process of the ba...

Claims

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Application Information

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IPC IPC(8): H01M10/50H01M2/02H01M10/613H01M10/625H01M10/653H01M50/244H01M50/249
CPCY02E60/10
Inventor 孙全佘沛亮陆亚山肖亮曹小亮
Owner NANJING SHUANGDENG SCI TECH DEV RES INST