Liquid cooling plate for double-layer energy storage battery

Abstract

The liquid cooling plate comprises a plate body, a liquid storage layer, a flow channel layer and a phase change layer, the liquid storage layer, the flow channel layer and the phase change layer are arranged in the plate body from top to bottom, and a liquid storage cavity is formed in the liquid storage layer; a runner group is arranged in the runner layer and consists of a plurality of parallel horizontal linear runners which are arranged in the horizontal direction; the phase change layer is provided with a horizontal cavity, and the horizontal cavity is filled with a phase change material; and the liquid outlet end of the flow channel group is communicated with the liquid storage cavity in the liquid storage layer. The liquid cooling plate is provided with the phase change layer, and the phase change material is subjected to phase change when absorbing heat, so that the temperature of each part of the battery can be effectively balanced, and the local overheating phenomenon is avoided. Besides, the independent liquid storage layer design not only increases the storage capacity of the cooling liquid, but also slows down the fire or extinguishes the fire through the cooling liquid under the unforeseen circumstances of battery fire and the like, so that the safety of the battery system is improved.

Description

Technical Field

[0001] This application relates to the field of energy storage batteries, and particularly to a liquid cooling plate for a double-layer energy storage battery. Background Art

[0002] Existing battery liquid cooling technologies mainly achieve battery cooling through single-layer liquid cooling plates. These liquid cooling plates are usually made of metal materials and dissipate heat through the coolant flowing inside. However, the existing technologies have significant deficiencies in terms of temperature uniformity heat transfer and safety. Due to the strong thermal conductivity of metal materials but insufficient heat dissipation uniformity, the battery overheats in local areas, thus affecting the battery performance and lifespan. In addition, the design of the single-layer liquid cooling plate limits its coolant storage capacity. Once an accident such as a battery fire occurs, the existing liquid cooling plates are difficult to effectively handle, increasing the safety risks.

[0003] The deficiencies of the existing technologies mainly stem from the following aspects. First, the traditional liquid cooling plate has a simple structure and lacks effective means for temperature uniformity heat transfer, resulting in uneven temperature distribution inside the battery. Second, the coolant storage capacity in the existing liquid cooling plates is limited and cannot provide enough coolant to effectively slow down or extinguish the fire in case of overheating or fire in the battery. Finally, the structural design of the single-layer liquid cooling plate cannot effectively control the fire in case of emergencies such as battery fire, which may lead to greater potential safety hazards. These deficiencies greatly limit the application and development of battery liquid cooling technologies.

[0004] To overcome the above deficiencies of the existing technologies, a new technology has developed a liquid cooling plate for a double-layer energy storage battery. Utility Model Content

[0005] The purpose of this application aims to at least overcome one deficiency existing in the prior art, and provides a liquid cooling plate for a double-layer energy storage battery. The liquid cooling plate has a phase change layer, and the phase change material undergoes a phase change when absorbing heat, which can effectively balance the temperatures of various parts of the battery and avoid the occurrence of local overheating. In addition, the independent liquid storage layer design not only increases the coolant storage capacity but also, in case of accidents such as battery fire, slows down the fire or extinguishes the fire through the coolant, improving the safety of the battery system.

[0006] To achieve the above purpose, this application discloses a liquid cooling plate for a double-layer energy storage battery, including a plate body, a liquid storage layer, a flow channel layer, and a phase change layer which are respectively arranged in the plate body from top to bottom. Among them, a liquid storage cavity is provided in the liquid storage layer; a flow channel group is provided in the flow channel layer, and the flow channel group is composed of a number of parallel horizontal straight flow channels arranged in the horizontal direction; the phase change layer has a horizontal cavity, and a phase change material is filled in the horizontal cavity; the liquid outlet end of the flow channel group is connected and communicated with the liquid storage cavity in the liquid storage layer.

[0007] Furthermore, a first liquid inlet assembly and a first liquid outlet assembly are provided on one side of the flow channel group, and a second liquid inlet assembly and a second liquid outlet assembly are provided on the opposite side. The first liquid inlet assembly and the second liquid outlet assembly are relatively matched to form a first cooling circuit, and the second liquid inlet assembly and the first liquid outlet assembly are relatively matched to form a second cooling circuit; the horizontal straight flow channels in the flow channel group are sequentially and alternately connected and communicated with the first cooling circuit and the second cooling circuit to form sequential forward and reverse liquid inlet in the flow channel group; the first liquid inlet assembly and the second liquid inlet assembly are jointly connected to the first liquid inlet end, and the first liquid outlet assembly and the second liquid outlet assembly are jointly connected to the liquid outlet end.

[0008] Furthermore, the cross-section of the horizontal straight flow channel is trapezoidal with a wider bottom and a narrower top.

[0009] Furthermore, the size of the horizontal cavity in the phase change layer is adapted to the size of the flow channel group in the flow channel layer.

[0010] Compared with the prior art, the present application has at least the following beneficial effects:

[0011] 1. Significantly improve the temperature equalization and heat transfer effect: The liquid cooling plate for the double-layer energy storage battery realizes the uniform distribution and flow of the coolant by designing alternating cooling circuits in the flow channel layer, thereby significantly improving the uniform heat exchange effect. At the same time, the phase change material in the phase change layer undergoes a phase change when absorbing heat, further balancing the temperature of each part of the battery, avoiding the occurrence of local overheating, and improving the performance and lifespan of the battery.

[0012] 2. Increase the storage capacity of the coolant: The independent liquid storage layer design significantly increases the storage capacity of the coolant, enabling the liquid cooling plate to provide sufficient coolant for effective fire mitigation or extinguishing in case of emergencies such as overheating or fire of the battery, greatly improving the safety of the battery system.

[0013] The beneficial effects listed above do not exhaust all the advantages. Other potential beneficial effects and detailed technical implementation manners will be further disclosed in the embodiments or other description parts of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] After reading the following specific implementation manners in conjunction with the drawings, various aspects of the present disclosure will be better understood. The positions, sizes, and ranges of the various structures shown in the drawings, etc., sometimes do not represent the actual positions, sizes, and ranges, etc. In the drawings:

[0015] Figure 1 is a schematic structural diagram of an embodiment disclosed in the present application.

[0016] Figure 2 is a schematic internal structure diagram of the plate body in an embodiment disclosed in the present application.

[0017] Figure 3 Yes Figure 2 It is an enlarged view of area A in the figure.

[0018] Figure 4 It is a schematic structural view of an embodiment disclosed in the present application from another perspective. Detailed implementation manners

[0019] The present disclosure will be described below with reference to the accompanying drawings, in which several embodiments of the present disclosure are shown. However, it should be understood that the present disclosure can be presented in many different ways and is not limited to the embodiments described below; in fact, the embodiments described below are intended to make the disclosure of the present disclosure more complete and fully explain the protection scope of the present disclosure to those skilled in the art. It should also be understood that the embodiments disclosed herein can be combined in various ways to provide more additional embodiments.

[0020] It should be understood that in all the drawings, the same reference numerals represent the same elements. In the drawings, for the sake of clarity, the dimensions of some features may be deformed.

[0021] It should be understood that the terms used in the specification are only for describing specific embodiments and are not intended to limit the present disclosure. All terms used in the specification (including technical terms and scientific terms) have the meanings commonly understood by those skilled in the art unless otherwise defined. For the sake of simplicity and / or clarity, technologies, methods, and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but in appropriate cases, the said technologies, methods, and devices should be regarded as part of the authorized specification.

[0022] The singular forms "a", "the", and "said" used in the specification include the plural forms unless clearly specified. The terms "including", "comprising", and "containing" used in the specification indicate the presence of the claimed features, but do not exclude the presence of one or more other features. The phrase "and / or" used in the specification includes any and all combinations of one or more of the related listed items. Embodiment

[0023] As Figures 1 to 4 shown, the embodiment relates to an exemplary structure of a liquid cooling plate for a double-layer energy storage battery, including a plate body 1, in which a liquid storage layer 2, a flow channel layer 3, and a phase change layer 4 are sequentially arranged from top to bottom. The plate body 1 is made of aluminum alloy material and has excellent thermal conductivity and structural strength. The liquid storage layer 2 is fixed in the plate body 1 by welding or bonding, and a liquid storage cavity is provided inside it. The liquid storage cavity is filled with a coolant, and the coolant can be water or other highly thermally conductive liquids, such as ethylene glycol solution.

[0024] In this embodiment, the flow channel layer 3 is located below the liquid storage layer 2. A flow channel group is provided in the flow channel layer 3, and the flow channel group is composed of a plurality of parallel horizontal linear flow channels 5 arranged in the horizontal direction. The cross-section of the flow channel 5 is trapezoidal with a wider bottom and a narrower top. This design helps to increase the flow rate of the coolant and improve the heat exchange efficiency. A first liquid inlet assembly 7 and a first liquid outlet assembly 9 are provided on one side of the flow channel group, and a second liquid inlet assembly 8 and a second liquid outlet assembly 10 are provided on the other side. The first liquid inlet assembly 7 and the second liquid outlet assembly 10 cooperate to form a first cooling circuit, and the second liquid inlet assembly 8 and the first liquid outlet assembly 9 cooperate to form a second cooling circuit. By this way of alternately feeding liquid in opposite directions, uniform distribution of the coolant in the flow channel 5 can be achieved, thus maintaining a high heat exchange efficiency.

[0025] In this embodiment, the phase change layer 4 is located below the flow channel layer 3. The phase change layer 4 has a horizontal cavity, and a phase change material 6 is filled in the horizontal cavity. The phase change material 6 can be paraffin or metal alloy, which has good phase change latent heat and stability. The phase change material 6 undergoes a phase change when absorbing heat, thereby balancing the temperature of each part of the battery and avoiding the occurrence of local overheating.

[0026] When the battery is working, the coolant enters from the liquid inlet end 11 and enters the horizontal linear flow channel 5 in the flow channel group through the first liquid inlet assembly 7. The coolant absorbs the heat of the battery in the flow channel 5, and uniform heat exchange effect is achieved through the alternating flow of the first cooling circuit and the second cooling circuit. This design of alternately feeding liquid in opposite directions is to overcome the problem that the heat exchange efficiency decreases due to the gradual increase of the coolant temperature in the prior art. In the traditional liquid cooling plate design, during the flow of the coolant from the liquid inlet to the liquid outlet, it continuously absorbs heat, resulting in a gradual increase in its temperature and a weakened heat absorption capacity. However, by the way of alternately feeding liquid in opposite directions, the coolant can be evenly distributed in the flow channel 5, and the coolant in each section of the flow channel can be effectively cooled, thus maintaining a high heat exchange efficiency.

[0027] This design not only balances the temperature distribution of the coolant, but also effectively improves the overall heat dissipation performance of the liquid cooling plate, avoids the problem of local overheating, and thus extends the service life of the battery. At the same time, the phase change material 6 in the phase change layer 4 undergoes a phase change when absorbing heat, further balancing the temperature of each part of the battery and avoiding the occurrence of local overheating.

[0028] For example, in actual use, when the energy storage battery is used in an electric vehicle, the liquid cooling plate for the double-layer energy storage battery can effectively maintain the operating temperature of the battery within a safe range, ensuring the running stability of the vehicle. In hot summer or under high-load operation conditions, the phase change material 6 in the liquid cooling plate can quickly absorb the excessive heat generated by the battery, prevent the battery temperature from being too high, and extend the service life of the battery. At the same time, in extreme cases, such as when the battery is short-circuited or damaged and catches fire, the coolant storage capacity in the liquid cooling plate can quickly provide coolant for fire extinguishing, avoid the spread of fire, and ensure the safety of the vehicle and passengers.

[0029] Through the structural design of the double-layer liquid cooling plate, not only the deficiencies of traditional liquid cooling technology in uniform temperature heat transfer and safety are solved, but also the overall performance and safety of the battery system are significantly improved by increasing the coolant storage capacity and utilizing the phase change material 6. This design is not only applicable to energy storage batteries, but also can be widely applied to other electronic devices that require efficient cooling and safety protection.

[0030] Although the exemplary embodiments of the present disclosure have been described, those skilled in the art should understand that various changes and modifications can be made to the exemplary embodiments of the present disclosure without departing from the spirit and scope of the present disclosure in essence. Therefore, all changes and modifications are included within the protection scope of the present disclosure defined by the claims. The present disclosure is defined by the appended claims, and equivalents of these claims are also included.

Claims

1. A liquid cooling plate for a double-layer energy storage battery, characterized in that, Comprising: A plate body, a liquid storage layer, a flow channel layer, and a phase change layer which are respectively arranged in the plate body from top to bottom. Among them, a liquid storage cavity is provided in the liquid storage layer; a flow channel group is provided in the flow channel layer, and the flow channel group is composed of a plurality of parallel horizontal linear flow channels arranged in a horizontal direction; the phase change layer has a horizontal cavity, and a phase change material is filled in the horizontal cavity; the liquid outlet end of the flow channel group is connected and communicated with the liquid storage cavity in the liquid storage layer.

2. The liquid cooling plate for a double-layer energy storage battery as described in claim 1, wherein: A first liquid inlet assembly and a first liquid outlet assembly are provided on one side of the flow channel group, and a second liquid inlet assembly and a second liquid outlet assembly are provided on the opposite side. The first liquid inlet assembly and the second liquid outlet assembly are relatively matched to form a first cooling circuit, and the second liquid inlet assembly and the first liquid outlet assembly are relatively matched to form a second cooling circuit; the horizontal linear flow channels in the flow channel group are sequentially and alternately connected and communicated with the first cooling circuit and the second cooling circuit to form sequential forward and reverse liquid inlet in the flow channel group; the first liquid inlet assembly and the second liquid inlet assembly are jointly connected to the first liquid inlet end, and the first liquid outlet assembly and the second liquid outlet assembly are jointly connected to the liquid outlet end.

3. A liquid cooling plate for a double-layer energy storage battery as described in claim 1, characterized in that: The cross-section of the horizontal linear flow channel is trapezoidal with a wider bottom and a narrower top.

4. The liquid cooling plate for a double-layer energy storage battery as described in claim 1, wherein: The size of the horizontal cavity in the phase change layer is adapted to the size of the flow channel group in the flow channel layer.

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