Hierarchical battery temperature control device of supercooled phase change material and temperature control method of hierarchical battery temperature control device

A phase change material, battery temperature control technology, applied in battery temperature control, secondary battery, battery pack components, etc., can solve the problems of limited application scenarios, inability to achieve multiple triggers, and inability to actively trigger

Pending Publication Date: 2022-04-05
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing battery temperature control methods may use electric heating. For example, the patent CN105186065A discloses a method for heating a battery with a resistance band, and CN204289674U discloses a heating method using the internal resistance of the battery. The system is complex; or phase change materials are used for thermal management. For example, patent CN113097599A discloses a passive battery thermal regulator based on phase change materials, and patent CN110416658A discloses a heat pipe-PCM coupled thermal management method with a temperature-controlled thermal switch , but they all belong to passive temperature adjustment methods. When the phase change material reaches the solidification temperature, the latent heat is released immediately, and the "supercooling" characteristic of the phase change material is not used to set an active adjustment method. Neither is a hierarchical structure, and the temperature cannot be adjusted. The interval is further subdivided to achieve a more reasonable and precise temperature adjustment purpose, and it cannot achieve the purpose of multiple triggers within a certain period of time
[0004] To sum up, the existing technology either does not use the "overcooling" characteristic of the phase change material, does not set an active trigger mechanism, and heats the battery when the phase change material solidifies, which is a passive trigger and cannot be actively triggered when needed; or does not use Phase change materials are set in stages, and the temperature cannot be precisely adjusted within a certain temperature range, and it cannot be actively triggered multiple times at multiple needed moments, and cannot flexibly adapt to climate changes in different seasons, which limits practical application scenarios

Method used

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  • Hierarchical battery temperature control device of supercooled phase change material and temperature control method of hierarchical battery temperature control device
  • Hierarchical battery temperature control device of supercooled phase change material and temperature control method of hierarchical battery temperature control device
  • Hierarchical battery temperature control device of supercooled phase change material and temperature control method of hierarchical battery temperature control device

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Embodiment 1

[0031] Such as figure 1 , image 3 As shown, this embodiment includes a battery 1 and a multi-stage cavity 2 sleeved outside the battery. The multi-stage cavity 2 is divided into two stages. Each stage of the cavity is filled with a supercooled phase change material, and the battery 1 is supercooled. Phase change material package. The two-stage chambers 2 are respectively a first-stage chamber 4 and a second-stage chamber 5 , and the first-stage chamber 4 and the second-stage chamber 5 overlap each other in the height direction. The supercooled phase change materials are all Na 2 S0 4 10H 2 0, the melting point is 32.4°C, and the supercooling degree is 20°C, filled in the two stages of the cavity 2. The two-stage bottoms of the cavity 2 are each provided with an active trigger mechanism to break the supercooled state of the supercooled phase change material and release latent heat to heat the battery. The top opening of each stage cavity 2 is sealed by a top cover 3 . T...

Embodiment 2

[0036] Such as figure 1 , image 3 As shown, this embodiment includes a battery 1 and a multi-stage cavity 2 sleeved outside the battery. The multi-stage cavity 2 is divided into two stages. Each stage of the cavity is filled with a supercooled phase change material, and the battery 1 is supercooled. Phase change material package. The two-stage chambers 2 are respectively a first-stage chamber 4 and a second-stage chamber 5 , and the first-stage chamber 4 and the second-stage chamber 5 overlap each other in the height direction. The supercooled phase change material is Na 2 S0 4 10H 2 0 and CaCl 6 ·6H 2 O, with melting points of 32.4°C and 29°C, and supercooling degrees of 20°C and 30°C, are respectively filled in the first-stage cavity 4 and the second-stage cavity 5 of the cavity 2 . The two-stage bottoms of the cavity 2 are each provided with an active trigger mechanism to break the supercooled state of the supercooled phase change material and release latent heat to...

Embodiment 3

[0041] Such as figure 2 , image 3 As shown, this embodiment includes a battery 1 and a multi-stage cavity 2 sheathed outside the battery, and the multi-stage cavity 2 is divided into three stages. Each cavity is filled with a supercooled phase change material, and the battery 1 is wrapped by the supercooled phase change material. The tertiary cavity 2 is respectively the first level cavity 4, the second level cavity 5 and the third level cavity 6, the first level cavity 4, the second level cavity 5 and the third level cavity 6 are at the height superimposed on each other. The supercooled phase change material is CaCl 2 ·6H 2 0, its melting point is 29°C, and its supercooling degree is 30°C, which are respectively filled in the three stages of the cavity 2. Each of the three bottoms of the cavity 2 is provided with an active trigger mechanism to break the supercooled state of the supercooled phase change material and release latent heat to heat the battery. The top open...

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Abstract

The invention belongs to the technical field of thermal management of power batteries, and particularly relates to a graded battery temperature control device of a supercooled phase change material and a temperature control method of the graded battery temperature control device. Each stage of cavity is filled with a supercooled phase change material, and the battery is wrapped by the supercooled phase change material; the supercooled phase change material can be in a supercooled non-solidification state in a low-temperature environment and absorbs heat to be melted in a high-temperature environment; an active triggering mechanism is arranged at the bottom of each stage of cavity and is used for triggering the solidification process of the supercooled phase change material in the cavity; and the controller is used for controlling the start and stop of the active triggering mechanism of the one-stage or multi-stage cavity according to the battery temperature. The working mode in winter is a preheating mode and a temperature control mode, the working mode in summer is a single temperature control mode, and by means of grading setting, refined temperature control over the battery is achieved, and the purpose of preventing the temperature of the battery from being too high is achieved.

Description

technical field [0001] The invention belongs to the technical field of thermal management of power batteries, and in particular relates to a temperature control device and a temperature control method for a graded battery of supercooled phase change materials. Background technique [0002] Most traditional cars use gasoline and diesel as fuel, and their combustion products have caused serious pollution to the ecological environment. In recent years, lithium-ion batteries have been widely used in electric vehicles due to their advantages of environmental protection, high energy density, and high power density, which has promoted the development of electric vehicles. However, temperature has a significant impact on the performance of lithium-ion batteries. Too high or too low temperature will have a great impact on the work of the battery. Under low temperature conditions, the battery will not be able to start the output, the heat capacity will be reduced, and the output perfo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/613H01M10/615H01M10/659H01M10/625H01M10/63H01M10/635H01M50/244H01M50/249
Inventor 廖志荣陈鹏嘉方永哲巨星徐超
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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