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Battery pack and thermal management method thereof

A technology for battery thermal management and battery packs, which is applied to secondary batteries, battery pack components, circuits, etc., can solve problems affecting the heating or heat preservation of battery packs, and achieve the effects of easy implementation, simple structure, and lightweight materials

Inactive Publication Date: 2020-04-24
汇洋世纪新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this natural cooling thermal management solution still has certain disadvantages. For example, when the battery pack needs to be heated or kept warm, the heat inside the battery pack will also be transferred to the outside of the battery pack, which will affect the heating or heat preservation effect of the battery pack.

Method used

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  • Battery pack and thermal management method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] like figure 1 As shown, the present embodiment provides a battery pack, including a battery box 1 and a heat insulating film 2, at least one side of the battery box 1 is provided with a heat dissipation plate 11, and the heat insulating film 2 is placed on one side of the heat dissipation plate 11 in a rollable and unrollable manner. On the other hand, the unrolled thermal insulation film 2 covers the surface of the cooling plate 11, and the winding and unwinding of the thermal insulation film 2 is controlled by the battery thermal management system.

[0022] One side of the heat dissipation plate 11 is provided with a guide rail, and the heat insulating film 2 is unrolled along the guide rail and covered on the surface of the heat dissipation plate 11 of the battery box. The thermal insulation film 2 is connected with a motor, and is rolled and unrolled under the action of the traction force of the motor. Wherein, the unrolled length of the heat insulating film 2 is g...

Embodiment 2

[0024] This embodiment provides a thermal management method for a battery pack, setting the external environment temperature as T ai , the real-time temperature of the battery pack is T i , according to the ambient temperature T ai and the real-time temperature T of the battery pack i Adjust the unwinding or rewinding of the thermal insulation film 2.

[0025] When 20℃≤T i When ≤35℃, the insulation film 2 is unwound. The battery pack is insulated from the outside world.

[0026] When T i ai i , the insulation film 2 is unwound. The battery pack is insulated from the outside world.

[0027] When T i ai > T i , the thermal insulation film 2 is wound up. The battery pack is free to heat exchange with the outside world.

[0028] When T i >35℃, and T ai i , the thermal insulation film 2 is wound up. The battery pack is free to heat exchange with the outside world.

[0029] When T i >35℃, and T ai > T i , the insulation film 2 is unwound. The battery pack is insul...

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Abstract

The invention belongs to the technical field of battery thermal management, and particularly relates to a battery pack. The battery pack comprises a battery box and a heat insulation film. A heat dissipation plate is arranged on at least one face of the battery box. The heat insulation film is arranged on one side of the heat dissipation plate in a rolling and unrolling mode. The unrolled heat insulation film covers the surface of the heat dissipation plate. Rolling and unrolling of the heat insulation film are controlled by a battery heat management system. According to the battery pack provided by the invention, when the heat insulation film is wound, the battery pack performs free heat exchange with the outside; and when the heat insulation film is unwound, the heat exchange between thebattery pack and the outside is greatly reduced. According to the invention, whether the battery pack exchanges heat with the outside or insulates heat can be controlled only by determining winding or unwinding of the heat insulation film according to the actual temperature. The battery pack provided by the invention is simple in structure and easy to implement. The heat insulation film is lightand handy, and the overall weight of the battery pack is not affected.

Description

technical field [0001] The invention belongs to the technical field of battery heat management, and in particular relates to a battery pack and a heat management method thereof. Background technique [0002] As a green battery, lithium-ion battery has the advantages of high energy density, low pollution, high cycle life, no memory effect, fast charging, etc., and is widely used in new energy vehicles. [0003] The power battery required by new energy vehicles generally requires multiple cells to be used in parallel or in series. All the cells are stacked together and placed in the battery pack. During the working process of the cells, a lot of heat will be generated. [0004] In the prior art, due to the comprehensive requirements of power battery energy density, cost and protection level, etc., when a large amount of heat is generated in the battery pack, a natural cooling thermal management scheme is usually adopted. Among them, natural cooling refers to the heat generated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/10H01M10/6554H01M10/658H01M10/635H01M10/613H01M10/615H01M10/625H01M50/20
CPCH01M10/6554H01M10/658H01M10/635H01M10/613H01M10/615H01M10/625H01M50/20Y02E60/10
Inventor 王易玮许瑞王军
Owner 汇洋世纪新能源科技有限公司
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