Double-conveying direct cooling plate with side wall capillary liquid absorption grooves

Abstract

The utility model discloses a double-conveying direct cooling plate with side wall capillary liquid absorption grooves, and relates to the field of battery heat dissipation, the direct cooling plate comprises a base plate and a heat exchange plate, the heat exchange plate is bent to form a heat exchange groove, and the outer bottom surface of the heat exchange groove is flat and serves as a heat exchange surface; a plurality of capillary liquid suction grooves are formed in the groove face of the heat exchange groove in the circumferential direction of a groove channel, and the capillary liquid suction grooves are arranged in the axial direction of the groove channel. The base plate is connected with the heat exchange plate and seals the heat exchange groove to form a heat exchange runner; the width of the capillary liquid absorption groove is 0.1-0.3 mm, and the depth-to-width ratio of the capillary liquid absorption groove is 1-5. The direct cooling plate is provided with the side wall capillary liquid suction grooves, wall face conveying except channel conveying is achieved, heat exchange efficiency is improved, meanwhile, continuous liquid supply and heat exchange can still be achieved through wall face conveying when air is blocked, and the working efficiency and safety of the direct cooling plate are improved.

Description

Technical Field

[0001] The present application relates to the field of battery heat dissipation, and in particular to a double-transport direct cooling plate with side wall capillary liquid absorption grooves. Background Art

[0002] Existing direct cooling plate technology has been widely used in the temperature control systems of energy storage batteries and power batteries. It designs multiple parallel or series flow channels inside the plate body to allow the refrigerant to flow through the flow channels, thereby achieving heat conduction and dissipation. The refrigerant takes away the heat generated by the battery through the flow of the flow channels to control the battery temperature. These flow channels are usually straight or curved, and the smooth structural design allows the refrigerant to pass with low resistance. However, with the continuous development of battery technology, the energy density of battery packs has gradually increased, and the heat generated has increased significantly. The traditional direct cooling plate design has shown shortcomings in the temperature control of high energy density battery packs, and it is difficult to cope with the increasing heat dissipation needs.

[0003] A key problem facing traditional direct cooling plates is the limitation of heat dissipation efficiency. Since the design of the flow channel is relatively simple, the flow pattern of the refrigerant inside the flow channel is relatively simple, and it mainly relies on the flow rate and flow rate of the refrigerant to improve the heat dissipation efficiency. However, when faced with high-power batteries, this design can easily lead to uneven distribution of the refrigerant in the flow channel, resulting in problems of insufficient local cooling. As the heat generated in the battery pack increases, the design of the traditional direct cooling plate cannot dissipate the heat in a timely and effective manner, which in turn affects the overall performance of the battery and may even cause safety problems. In addition, the smooth structure of the traditional flow channel design makes it easy for the refrigerant to form laminar flow, resulting in a small contact area between the liquid and the flow channel wall, limited heat transfer efficiency, and unable to fully take away the large amount of heat generated by the battery.

[0004] What is more serious is that when the direct cooling plate uses refrigerant as the working fluid, it is easy to cause gas plugs due to the phenomenon of heat vaporization. The formation of gas plugs will block the normal flow of the refrigerant, resulting in the inability of the refrigerant in the flow channel to circulate effectively, thus forming "heat dissipation dead spots" in some areas. These heat dissipation dead spots cannot dissipate the heat of the battery in time, causing the local temperature to rise sharply, which may eventually cause thermal runaway of the battery, seriously threatening the safety of the battery. This problem is particularly prominent in high-energy density battery packs. The rapidly accumulated heat and delayed heat dissipation effect will greatly increase the risk of battery failure.

[0005] The main reasons for these deficiencies lie in the limitations of the traditional direct cooling plate flow channel design. First of all, although the smooth design of the flow channel wall reduces the flow resistance, it also limits the contact area between the refrigerant and the wall, resulting in low heat transfer efficiency. Secondly, the flow channel design is too single, failing to make full use of the space inside the flow channel and unable to effectively improve the cooling effect. In addition, the gas plug problem highlights the deficiencies of the existing direct cooling plate in dealing with refrigerant gasification and fails to effectively prevent and alleviate the impact of refrigerant gasification on the refrigerant circulation in the flow channel. Therefore, in the face of high-power and high-energy-density battery packs, the design of traditional direct cooling plates is gradually difficult to meet higher heat dissipation requirements. Summary of the Invention

[0006] The purpose of this application is to overcome the deficiencies of the prior art and provide a dual-conveyance direct cooling plate with capillary liquid absorption grooves on the side walls. The direct cooling plate has capillary liquid absorption grooves on the side walls to achieve wall conveyance in addition to channel conveyance. While improving the heat transfer efficiency, it can still achieve continuous liquid supply and heat exchange through wall conveyance during gas plugging, improving the working efficiency and safety of the direct cooling plate.

[0007] To achieve the above purpose, this application discloses a dual-conveyance direct cooling plate with capillary liquid absorption grooves on the side walls. The direct cooling plate includes a base plate and a heat exchange plate. Among them, a heat exchange groove is formed by bending on the heat exchange plate, and the outer bottom surface of the heat exchange groove is flat and serves as the heat exchange surface; there are several capillary liquid absorption grooves arranged along the circumferential direction of the groove on the groove surface of the heat exchange groove, and each capillary liquid absorption groove is arranged along the axial direction of the groove; the base plate is connected to the heat exchange plate and seals the heat exchange groove to form a heat exchange flow channel; the capillary liquid absorption groove is 0.1 - 0.3 mm wide, and the depth-width ratio of the capillary liquid absorption groove is 1 - 5.

[0008] In some embodiments, the cross-section of the heat exchange flow channel is one of a trapezoid, a triangle, a polygon, or an ellipse;

[0009] In some embodiments, the maximum groove width of the capillary liquid absorption groove is 3 mm - 50 mm.

[0010] In some embodiments, a heat insulation layer is provided on the back of the base plate.

[0011] In some embodiments, the capillary liquid absorption grooves in the heat exchange groove are spaced non-equidistantly, and the spacing distance is adjusted to increase the number of capillary liquid absorption grooves in a local area of the heat exchange groove.

[0012] In some embodiments, the capillary liquid absorption grooves in the heat exchange groove are connected and conduct.

[0013] Compared with the prior art, this application has at least the following beneficial effects:

[0014] 1. Improve heat transfer efficiency: By setting capillary liquid absorption grooves on the side wall of the heat exchange tank, the contact area between the refrigerant and the wall surface is enhanced, effectively improving the heat transfer efficiency and overcoming the problem of insufficient contact between the refrigerant and the wall surface in the traditional flow channel design. The capillary liquid absorption grooves not only increase the heat transfer area but also enable the refrigerant to conduct heat more effectively, improving the heat dissipation effect, and are particularly suitable for the temperature control of high-energy density battery packs.

[0015] 2. Solve the air plug problem: The present application realizes a dual delivery mechanism through the side wall capillary liquid absorption grooves. When the refrigerant vaporizes to generate an air plug, the capillary liquid absorption grooves can still continue to deliver the refrigerant, preventing the interruption of the refrigerant cycle, avoiding the occurrence of heat dissipation dead spots, ensuring the effective control of the temperature in the local area, thereby reducing the risk of battery thermal runaway and significantly improving the safety of the system.

[0016] 3. Optimize the structural design: By adjusting the depth-width ratio and non-uniform spacing design of the capillary liquid absorption grooves, the present application effectively utilizes the space inside the heat exchange tank and further improves the local heat transfer capacity of the heat exchange tank. The flexible structural design enables the heat exchange tank to be optimized according to different application requirements and adapt to a variety of battery cooling scenarios.

[0017] 4. Enhance stability and safety: The heat insulation layer on the back of the substrate not only isolates the external heat transfer but also improves the stability of the entire structure, further ensuring the normal operation of the battery in a high-temperature environment and reducing the impact of high temperature on the cooling system.

[0018] The beneficial effects listed above do not exhaust all the advantages. Other potential beneficial effects and detailed technical implementation manners will be further revealed in the embodiments or other description parts of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] After reading the following specific implementation manners in conjunction with the drawings, various aspects of the present disclosure will be better understood. Sometimes, the positions, dimensions, and ranges of the various structures shown in the drawings, etc., do not represent the actual positions, dimensions, and ranges, etc. In the drawings:

[0020] Figure 1 is a schematic structural diagram of an embodiment disclosed in the present application.

[0021] Figure 2 is a schematic structural diagram of an embodiment disclosed in the present application from another perspective.

[0022] Figure 3 is an exploded view of the structure of an embodiment disclosed in the present application.

[0023] Figure 4 is a schematic structural diagram of a heat exchange plate in an embodiment to be applied and disclosed.

[0024] Figure 5 isFigure 4 Enlarged view of part A Detailed implementation manners

[0025] 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.

[0026] It should be understood that in all the drawings, the same reference numerals denote the same elements. In the drawings, for the sake of clarity, the dimensions of some features may be deformed.

[0027] 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 art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorized specification.

[0028] The singular forms "a", "the", and "said" used in the specification include the plural forms unless clearly specified. The terms "comprising", "including", 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 term "and / or" used in the specification includes any and all combinations of one or more of the related listed items. Embodiment

[0029] As Figures 1 to 5 shown, this embodiment provides a double-delivery direct cooling plate applicable to a high energy density battery pack, which has a specially designed capillary liquid absorption groove structure, significantly improves the heat dissipation efficiency, ensures the stable operation of the battery pack in a high-temperature environment, and prevents performance degradation or safety hazards caused by heat accumulation.

[0030] The direct cooling plate is composed of a base plate 1, a heat exchange plate 2, and a capillary liquid absorption groove 5, with a compact overall structure and strong functionality. The base plate 1 is the main part of the direct cooling plate and is made of a material with excellent thermal conductivity, such as aluminum alloy or copper alloy. These materials not only have good thermal conductivity but also can provide sufficient structural strength to ensure the durability and reliability of the direct cooling plate during long-term use. An insulating layer 7 is designed on the back of the base plate 1, usually made of a high heat-resistant insulating material such as polyimide or silicone rubber, which effectively isolates the heat from the external environment and ensures stable temperature control inside the cooling system.

[0031] The heat exchange plate 2 is formed into a plurality of heat exchange grooves 3 through a bending process. The outer bottom surface 4 of each heat exchange groove 3 is flat and fits tightly with the battery surface. As a heat exchange surface, it directly absorbs the heat conducted from the battery surface. A plurality of capillary absorption grooves 5 are arranged on the inner wall of the heat exchange groove 3. These grooves are arranged along the axial direction of the groove, with a width of 0.1-0.3mm and a depth-to-width ratio of 1-5. The size is fine and can absorb the refrigerant to every corner of the heat exchange groove through capillary action, effectively increasing the contact area between the refrigerant and the inner wall. The design of the capillary absorption groove 5 expands the delivery range of the refrigerant, especially in areas that the heat exchange groove cannot effectively cover, ensuring that the refrigerant is evenly distributed and enhancing the heat dissipation effect.

[0032] The base plate 1 and the heat exchange plate 2 are sealed and connected by high-precision machining or welding technology, and the opening of the heat exchange groove 3 is completely closed to form a complete heat exchange channel 6. After the refrigerant flows in from the channel inlet, it can flow smoothly in the closed channel and directly contact the inner wall surface of the heat exchange plate 2 to achieve efficient heat exchange. The refrigerant takes away most of the heat through the heat exchange channel 6 to keep the temperature of the battery pack within a safe range.

[0033] When the battery pack is working, the high energy density batteries will generate a lot of heat, so the heat dissipation requirements are high. Through the design of the direct cooling plate, the refrigerant can quickly absorb heat when flowing through the heat exchange channel 6, and take the heat away through the heat exchange surface. In order to further improve the heat dissipation efficiency, the present embodiment designs capillary absorption grooves 5 in the heat exchange groove 3. These grooves can not only adsorb the refrigerant through capillary action, but also transport the refrigerant along the wall of the heat exchange groove to expand the heat dissipation area. The role of the capillary absorption groove is similar to providing an additional transport channel for the refrigerant, allowing the refrigerant to enter every corner of the heat exchange groove 3, avoiding local overheating or uneven refrigerant delivery.

[0034] The capillary absorption grooves 5 are recessed along the circumference of the heat exchange groove 3 and are interconnected, which means that the refrigerant can flow freely between multiple grooves. The purpose of this design is to avoid excessive accumulation or deficiency of refrigerant in certain areas, and to ensure that the coolant can be evenly distributed on the inner wall surface of the entire heat exchange groove 3. After flowing through a groove, the refrigerant can enter other grooves through the conductive path, thereby achieving uniform distribution of the liquid throughout the heat exchange groove 3. This flow mechanism of the refrigerant not only improves the heat dissipation efficiency, but also avoids excessive temperature in local areas, ensuring the stability and consistency of the heat dissipation process.

[0035] Under high-temperature working conditions, the refrigerant may partially vaporize due to excessive temperature, forming a gas plug. In the traditional direct cooling plate design, when a gas plug forms, it often leads to the interruption of the refrigerant circulation, causing the heat in a local area to not be dissipated in time, and then forming a "heat dissipation dead zone". In this embodiment, through the design of the capillary liquid suction groove 5, even when a gas plug forms, the refrigerant can still continue to flow along the wall surface of the heat exchange groove through capillary adsorption, maintaining the continuous delivery of the refrigerant and avoiding the generation of heat dissipation dead zones. Even if the gas plug obstructs the flow in some areas, the capillary liquid suction groove can still adsorb and transfer the refrigerant along the wall surface to ensure that the refrigerant flow in the heat exchange channel 6 is not interrupted.

[0036] In actual use scenarios, direct cooling plates are widely used in the temperature control and heat dissipation management of high-energy-density battery packs. Especially in electric vehicles and large-scale energy storage systems, the battery packs are often in a high-power working state, generating a large amount of heat and having extremely stringent heat dissipation requirements. In these scenarios, the direct cooling plate is in close contact with the battery surface, and the refrigerant quickly removes heat through the heat exchange channel 6 and the capillary liquid suction groove 5, avoiding performance degradation or safety hazards caused by overheating of the battery pack. This dual refrigerant delivery mechanism ensures that the refrigerant can evenly cover the heat exchange surface, and even under extreme working conditions, it can maintain stable heat dissipation performance, further improving the working efficiency and safety of the battery pack.

[0037] Through the refined design of the capillary liquid suction groove 5, this embodiment not only transfers heat through the heat exchange channel, but also uses the capillary liquid suction groove to conduct additional delivery of the refrigerant along the wall surface, greatly improving the heat exchange efficiency. The refrigerant can achieve a larger heat exchange area in the heat exchange groove, while avoiding the gas plug problem caused by refrigerant vaporization in the traditional direct cooling plate, ensuring the efficient heat dissipation and safe operation of the battery pack.

[0038] 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 substantially departing from the spirit and scope of the present disclosure. 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 double-delivery direct cooling plate with capillary liquid suction grooves on the side walls, characterized in that, The direct cooling plate includes: a base plate and a heat exchange plate. Among them, heat exchange grooves are formed by bending on the heat exchange plate, and the outer bottom surface of the heat exchange groove is flat and serves as the heat exchange surface; there are several capillary liquid suction grooves arranged along the circumferential direction of the groove on the groove surface of the heat exchange groove, and each capillary liquid suction groove is arranged along the axial direction of the groove; the base plate is connected to the heat exchange plate and seals the heat exchange groove to form a heat exchange flow channel; the capillary liquid suction groove is 0.1-0.3 mm wide, and the depth-width ratio of the capillary liquid suction groove is 1-5.

2. The double-conveyance direct cooling plate with sidewall capillary liquid absorption grooves as described in claim 1, wherein: The cross-section of the heat exchange flow channel is one of a trapezoid, a triangle, a polygon or an ellipse.

3. The dual-delivery direct cooling plate with sidewall capillary liquid suction grooves as described in claim 1, wherein: The maximum groove width of the capillary liquid suction groove is 3 mm - 50 mm.

4. A dual-delivery direct cooling plate with sidewall capillary liquid absorption grooves as described in claim 1, characterized in that: A heat insulation layer is provided on the back surface of the base plate.

5. A double-delivery direct cooling plate with capillary liquid suction grooves on the side walls as described in claim 1, characterized in that: The capillary liquid suction grooves in the heat exchange groove are spaced non-equidistantly, and the spacing distance is adjusted to increase the number of capillary liquid suction grooves in the local area of the heat exchange groove.

6. The double-delivery direct cooling plate with sidewall capillary liquid suction grooves as described in claim 1, wherein: The capillary liquid suction grooves in the heat exchange groove are connected and conduct.

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