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Air-cooled heat dissipation system for battery pack and thermal management method thereof

A technology for cooling systems and battery packs, applied in secondary batteries, battery temperature control, circuits, etc., can solve the problems of difficulty in controlling the local temperature difference of the battery pack, and the inability to meet the heat dissipation requirements of multiple working conditions, so as to solve the abnormal rise in battery temperature. , Conducive to large-scale application promotion, the effect of reducing energy consumption

Active Publication Date: 2021-10-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an air-cooled and heat-dissipating system for a battery pack with a temperature difference control function and a thermal management method for the existing air-cooled heat dissipation structure that is difficult to control the local temperature difference of the battery pack and cannot meet the heat dissipation requirements of multiple working conditions

Method used

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  • Air-cooled heat dissipation system for battery pack and thermal management method thereof
  • Air-cooled heat dissipation system for battery pack and thermal management method thereof
  • Air-cooled heat dissipation system for battery pack and thermal management method thereof

Examples

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Embodiment 1

[0035] Such as figure 1 As shown, this embodiment provides an air-cooled heat dissipation structure for a battery pack, including:

[0036] A battery pack composed of M battery cells, a box for accommodating the battery pack, and opposite ends of the box having air inlets and air outlets communicating with the box;

[0037] The fan used for ventilation and heat dissipation, in this embodiment, from the air inlet at one end of the box to the air outlet at the other end of the box every Each battery cell is equipped with a fan, that is, any Fans are installed at the beginning and end of a battery pack composed of two battery cells, and the temperature of the battery section is cooled by air cooling;

[0038] Temperature sensors for monitoring the temperature of various parts of the battery pack;

[0039] A current sensor for detecting the discharge current of the battery pack;

[0040] central control unit

[0041] Control circuit;

[0042] The battery pack, temperature ...

Embodiment 2

[0044] This embodiment is based on figure 2 The parallel ventilation and heat dissipation structure of the battery pack shown is used for simulation analysis of the battery pack. The battery pack studied in this example uses a domestic 18650 lithium iron phosphate battery. The entire battery pack is composed of 16 monomers to form a 48V battery pack. Lithium-ion batteries work at 25°C-45°C, and the maximum temperature difference between batteries is 5°C. The battery interval in the battery pack is 5mm. In order to prevent backflow, the length of the air inlet and air outlet pipes is extended. A blower is respectively placed at the two pipe openings. When No. 1 blower starts, No. 2 blower turns off, the right pipe is the air inlet, and the left pipe is the air outlet; when No. 2 blower starts, No. 1 blower is turned off, the left pipe is the air inlet, and the right pipe is the air outlet.

[0045] When the No. 1 blower starts and the No. 2 blower turns off, a large amount o...

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Abstract

An air-cooled heat dissipation system for a battery pack with a temperature difference control function and a heat management method thereof. The invention belongs to the technical field of thermal management of battery packs. In the present invention, the battery pack is divided into a plurality of battery sections with fans installed at both ends, and whether the temperature difference is judged according to whether the discharge current of the battery pack reaches the threshold current; Exceeding the rated temperature difference to judge whether to turn on the corresponding fan operation to achieve thermal management. The present invention introduces the current control condition on the basis of the traditional temperature control, and uses the latter as the precondition for judging the temperature difference to operate the fan, so that the battery pack can spontaneously and real-time adjust the working mode of the fan according to the working condition of the battery, realizing effective cooling while cooling Control the temperature difference in the battery pack, and can significantly reduce energy consumption. The air-cooling system of the invention has good heat dissipation effect, energy saving, high efficiency, strong versatility, simple and easy-to-operate heat management method, and is favorable for large-scale application and popularization.

Description

technical field [0001] The invention belongs to the technical field of heat dissipation management of battery packs, and in particular relates to an air-cooled heat dissipation system of a battery pack with a temperature difference control function and a heat management method thereof. Background technique [0002] As the power source of electric vehicles, power batteries often require batteries to be connected in series and parallel to form a battery pack. Due to the limited space for loading batteries, the batteries are closely packed. When the battery pack is being charged or discharged at different rates under different working conditions, electrochemical reactions will occur inside the battery pack to generate heat rapidly and the temperature will rise sharply. The dense arrangement of a large number of single cells in the battery pack makes it difficult to discharge the accumulated heat. , the temperature of the battery may exceed the normal range when working for a lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/613H01M10/63H01M10/637H01M10/6563
CPCH01M10/613H01M10/63H01M10/637H01M10/6563Y02E60/10
Inventor 徐自强吴孟强马永笠马云飞李湜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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