Double-conveying direct cooling plate with spiral capillary channels

Abstract

The utility model discloses a double-conveying direct cooling plate with a spiral capillary channel, the direct cooling plate comprises a structure substrate and a heat exchange cover plate which is overlapped and fixed on the structure substrate, the heat exchange cover plate is provided with a groove, and the groove is sealed by the structure substrate to form a heat exchange flow channel; the groove face of the heat exchange cover plate is provided with a plurality of spiral capillary conveying grooves in the flowing direction of a flow channel, the depth of each capillary conveying groove is 0.1-0.5 mm, and the width of each capillary conveying groove is 0.1-0.3 mm. And the runner is provided with a heat insulation layer on one surface of the structural substrate. According to the direct cooling plate, the spiral capillary channel structure is introduced to the wall face of the flow channel, the contact area of cooling liquid and the wall face is increased, a second conveying mode except the flow channel is provided, and therefore the heat transfer efficiency is remarkably improved. Meanwhile, the design can effectively relieve the formation of an air plug and avoid the occurrence of a heat dissipation dead point so as to adapt to battery packs of different types and powers and meet the temperature control requirements of the battery packs.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange temperature control, and particularly relates to a double-conveying straight cooling plate with spiral capillary channels. BACKGROUND

[0002] The existing straight cooling plate technology is widely used in the temperature control systems of energy storage batteries and power batteries. Generally, the straight cooling plate realizes the flow of the cooling liquid by designing multiple parallel or serial flow channels inside the plate body to achieve heat conduction and heat dissipation. These flow channels are usually smooth straight lines or curves, which rely on the flow of the cooling liquid to take away the heat generated by the battery to control the temperature of the battery. However, with the continuous advancement of battery technology, the energy density of the battery pack is continuously improved, and the heat generated is also increasing, and the heat dissipation effect of the traditional straight cooling plate gradually cannot meet the temperature control needs of high-performance batteries.

[0003] One of the significant problems of the traditional straight cooling plate is the limitation of heat dissipation efficiency. Since the flow channel design is relatively simple, the flow pattern of the cooling liquid in the flow channel is relatively simple, mainly relying on the speed and flow of the cooling liquid to improve the heat dissipation effect. However, this design is prone to uneven cooling in some local areas of the flow channel when facing high-power battery packs, which leads to the inability to timely dissipate heat, thereby affecting the overall performance and safety of the battery. In addition, the smooth structure of the flow channel is prone to form a laminar flow of the cooling liquid in the flow channel. In this flow mode, the contact area between the liquid and the flow channel wall is relatively small, and the heat transfer efficiency is low, making it difficult to effectively take away a large amount of heat.

[0004] More seriously, the working medium (refrigerant) used in the straight cooling plate is prone to vaporization when heated, thereby forming a gas plug in the flow channel. The presence of the gas plug will block the normal flow of the working medium, causing the cooling liquid in some areas of the flow channel to be unable to circulate effectively, forming so-called "heat dissipation dead points". These heat dissipation dead points cannot timely dissipate the heat generated by the battery, further increasing the risk of local temperature rise, and ultimately may lead to thermal runaway of the battery. This problem is particularly prominent in high-energy-density battery packs, because the rapid accumulation of heat and the lag of heat dissipation will greatly threaten the safety of the battery.

[0005] The reason for the above-mentioned deficiencies is that the flow channel design of the traditional straight cooling plate lacks sufficient detail optimization, especially in the treatment of wall surface structure and flow channel layout. Although the smooth wall surface helps to reduce flow resistance, it is difficult for heat to be transferred to the cooling liquid through the limited contact area under high temperature conditions. In addition, the single mode of flow channel design cannot fully utilize the space in the flow channel, resulting in the limitation of cooling effect. The gas plug problem further highlights the shortcomings of the existing flow channel design in dealing with refrigerant vaporization. Therefore, when facing high-heat-output battery packs, the design of the traditional straight cooling plate gradually shows its limitations, and it is difficult to meet higher heat dissipation needs.

[0006] In order to overcome the deficiencies of the prior art, it is of great significance to develop a double-conveying straight cooling plate with a spiral capillary channel. Content of the utility model

[0007] The purpose of the present application is to at least overcome one deficiency of the prior art, provide a double-conveying straight cooling plate with a spiral capillary channel, which introduces a spiral capillary channel structure on the wall surface of the flow channel, not only increases the contact area of the cooling liquid with the wall surface, but also provides a second conveying form in addition to the flow channel, thereby significantly improving the heat transfer efficiency. At the same time, this design can effectively alleviate the formation of gas plugs and avoid the occurrence of heat dissipation dead points, so as to adapt to different types and powers of battery packs and meet their temperature control requirements.

[0008] To achieve the above-mentioned purpose, the present application discloses a double-conveying straight cooling plate with a spiral capillary channel, which comprises a structural substrate and a heat exchange cover plate stacked and fixed on the structural substrate, the heat exchange cover plate has a groove, and the structural substrate plate seals the groove to form a heat exchange flow channel; the groove surface of the heat exchange cover plate has a plurality of spiral capillary conveying grooves along the flow channel; the depth of a single capillary conveying groove is 0.1-0.5 mm, and the width is 0.1-0.3 mm; and the flow channel is provided with a heat insulation layer on one side of the structural substrate.

[0009] In some embodiments, the cross section of the capillary conveying groove is one or a combination of inverted V type, inverted omega type, inverted trapezoidal type, and rectangular type.

[0010] In some embodiments, at least one turbulence protrusion is provided on the heat insulation layer.

[0011] In some embodiments, the cross section of the groove is one of inverted trapezoidal, arc, and rectangular.

[0012] Compared with the prior art, the present application has at least one of the following beneficial effects:

[0013] 1. By designing a spiral capillary conveying groove on the wall surface of the flow channel, the contact area of the cooling liquid with the wall surface is increased, and the heat transfer efficiency is significantly improved.

[0014] 2. The design of the double-conveying form effectively alleviates the formation of gas plugs in the flow channel and avoids the occurrence of heat dissipation dead points, thereby improving the temperature control performance.

[0015] 3. The application of the heat insulation layer further reduces the conduction of heat to the structural substrate, and improves the overall heat insulation effect.

[0016] The above-listed beneficial effects are not exhaustive of all advantages. Other potential beneficial effects and detailed technical implementation methods will be further disclosed in the embodiments or other description parts of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0017] Aspects of the present disclosure will become more fully understood from the detailed description and accompanying drawings. The drawings are intended for illustrative purposes only and the dimensions, positions, and / or relative sizes of the structures shown therein are not necessarily to scale. In the drawings:

[0018] Figure 1 is a structural schematic diagram of an embodiment of the present disclosure.

[0019] Figure 2 is an exploded structural view of an embodiment of the present disclosure.

[0020] Figure 3 is a structural schematic diagram of a heat exchange cover plate in an embodiment of the present disclosure.

[0021] Figure 4 is a structural schematic diagram of a heat exchange cover plate in an embodiment of the present disclosure from another perspective. DETAILED DESCRIPTION

[0022] The present disclosure will be described with respect to the drawings in which only a few embodiments of the present disclosure are shown. These embodiments are described in sufficient detail to enable those skilled in the art to make and use the present disclosure, and it is understood that the disclosure can take many different forms and the disclosure is to be considered in a descriptive sense only and not for purposes of limitation. The present disclosure is also understood to encompass various combinations of embodiments described herein.

[0023] It is understood that, in all the drawings, the same reference numerals will be used to represent the same elements throughout the several views. In the drawings, the sizes of certain features can be exaggerated for clarity.

[0024] It is understood that the phraseology and terminology used herein is for the purpose of description and not of limitation. All technical terms used herein are to be understood to be common usage of terms by those skilled in the art unless otherwise defined. For the purposes of the present disclosure, the following terms are defined with the following meanings. For simplicity and / or clarity, techniques, methods, and apparatuses known to be employed by those of ordinary skill in the relevant art are not necessarily described in detail.

[0025] As used in the description of the disclosure, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. The use of the term "includes" or "containing" means that other elements can also be present. The use of the term "and / or" includes all combinations of one or more of the associated listed items. EMBODIMENTS

[0026] As Figures 1 to 4As shown, this embodiment discloses a dual-conveying direct cooling plate with spiral capillaries. Its structure includes a structural base plate 1, a heat exchange cover plate 2 superimposed and fixed on the structural base plate 1, and a thermal insulation layer 3. The entire direct cooling plate system is designed to effectively control the temperature of the battery and avoid local overheating by improving the flow efficiency of the refrigerant and the efficiency of heat transfer.

[0027] The heat exchange cover 2 is made of a metal material with high thermal conductivity, such as aluminum alloy (thermal conductivity of 230 W / m·K) or copper alloy (thermal conductivity of 385 W / m·K). These materials ensure that the heat generated by the battery is quickly transferred to the refrigerant, achieving rapid heat dissipation. Aluminum alloy not only has good thermal conductivity, but also has the advantages of light weight and low cost. Copper alloy has a higher thermal conductivity and is suitable for high heat load scenarios. The structural substrate 1 is made of high-strength, corrosion-resistant materials such as stainless steel (tensile strength of 550 MPa) or composite materials. Stainless steel is not only corrosion-resistant but also has high mechanical strength, ensuring long-term stability and durability of the structure. It is particularly suitable for use in high-temperature and high-humidity environments.

[0028] The heat exchange cover plate 2 is designed with grooves 4 along the direction of the working medium. These grooves are enclosed by the structural base plate 1 to form heat exchange channels 5. The cross-sectional shape of the heat exchange channels can be selected from an inverted trapezoid, an arc, or a rectangle depending on the application scenario. The inverted trapezoidal design helps maintain a stable flow of the refrigerant, the arc design enhances the fluidity of the refrigerant in the channel, and the rectangular design provides a larger contact area, significantly improving heat exchange efficiency.

[0029] The thermal insulation layer 3 is located on the side of the structural substrate 1 located on the heat exchange flow channel 5 and is made of a high-temperature resistant, low-thermal conductivity material, such as ceramic fiber or high-density foam material. The thermal conductivity of these materials is as low as 0.03-0.1 W / m·K, which can effectively prevent heat from being transferred from the cooling area to the structural substrate 1, ensuring that the heat is concentrated in the heat exchange flow channel 5 for effective heat dissipation, avoiding ineffective heat transfer, and thus improving the overall heat dissipation efficiency.

[0030] A number of spiral capillary conveying grooves 6 are arranged on the wall surface of the groove 4, and the depth of each capillary groove is 0.1-0.5 mm and the width is 0.1-0.3 mm. The main design purpose of the spiral capillary groove is to transport the refrigerant through the wall surface, increase the contact area between the refrigerant and the wall surface of the heat exchange flow channel 5, and effectively improve the heat dissipation effect. These capillary grooves can prevent the gas plug problem caused by the vaporization of the refrigerant, ensure the uniform flow of the refrigerant in the flow channel, and avoid the temperature control dead point problem caused by gas plug. Under high heat load conditions, the spiral capillary groove design can continuously ensure the smooth flow of the refrigerant and further improve the uniformity of temperature control.

[0031] The cross-sectional shape of the groove 4 can be an inverted trapezoid, an arc or a rectangle, which are suitable for different flow scenarios. For example, the inverted trapezoid can guide the refrigerant to flow effectively and reduce the formation of vortices. The arc cross-section helps the refrigerant to form a stable laminar flow on the wall surface, while the rectangle increases the heat transfer contact area, which is suitable for scenarios with efficient heat exchange requirements.

[0032] To further enhance refrigerant flow efficiency, thermal insulation layer 3 may also be provided with flow-disrupting projections (not shown). These projections are 0.5-1.5 mm high and spaced 10-15 mm apart. These flow-disrupting projections create minute disturbances during refrigerant flow, disrupting laminar flow and creating turbulent flow. This further enhances contact between the refrigerant and the wall, improving heat exchange efficiency, and reducing the likelihood of air locks forming within the flow channel, ensuring uniform distribution of the cooling liquid.

[0033] This direct cooling plate uses refrigerant as a working fluid and is compatible with a variety of refrigerants, such as R134a and R1234yf. The high heat capacity and low viscosity of these refrigerants ensure rapid flow within the heat exchange channel and effectively absorb heat generated by the battery. If the refrigerant encounters high-temperature vaporization during flow, the spiral capillary grooves 6 ensure uniform flow along the wall, preventing vaporization and ensuring continued efficient operation of the cooling system.

[0034] When the refrigerant enters the heat exchange channel 5, it initially flows rapidly along the main channel. Simultaneously, due to the presence of the spiral capillary grooves 6, the refrigerant also undergoes a secondary flow along the channel walls. The spiral capillary grooves not only increase the contact time between the refrigerant and the wall, but also enhance the turbulence of the fluid within the channel through the spiral design, thereby improving heat exchange efficiency. Even when the battery pack is operating at high power, the cooling system maintains a uniform temperature distribution, preventing the formation of air locks, effectively ensuring the heat dissipation requirements of the battery and preventing thermal runaway.

[0035] The spiral capillary grooves (6) in the direct cooling plate effectively address localized overheating under high heat loads, particularly in high-power battery packs. The cooling system effectively mitigates gas locks caused by refrigerant vaporization, ensuring uniform temperature control. The turbulent flow design within the insulation layer further enhances refrigerant flow efficiency, preventing gas stagnation within the flow channel and ensuring continued efficient operation of the cooling system.

[0036] This design is particularly well-suited for cooling systems in high-power battery packs, such as those found in electric vehicles. During extended periods of operation or high temperatures, the direct cooling plate effectively controls battery temperature, preventing localized overheating and thermal runaway.

[0037] Although exemplary embodiments of the present disclosure have been described, it will be understood by those skilled in the art that various changes and modifications may be made to the exemplary embodiments of the present disclosure without departing substantially from the spirit and scope of the present disclosure. Therefore, all such changes and modifications are intended to be within the scope of protection of the present disclosure as defined by the appended claims. The present disclosure is defined by the appended claims, and equivalents of these claims are intended to be included therein.

Claims

1. A double-conveying direct cooling plate with spiral capillary channels, characterized in that: The direct cooling plate includes: a structural substrate, a heat exchange cover plate superimposed and fixed on the structural substrate, the heat exchange cover plate has a groove, the structural substrate plate seals the groove to form a heat exchange flow channel; the groove surface of the heat exchange cover plate has a plurality of spiral capillary conveying grooves along the flow channel, and the depth of a single capillary conveying groove is 0.1-0.5 mm and the width is 0.1-0.3 mm; the flow channel is provided with a heat insulation layer on one side of the structural substrate.

2. A double-conveying direct cooling plate with spiral capillaries as claimed in claim 1, characterized in that: The cross section of the capillary conveying groove is one or more combinations of an inverted V shape, an inverted Ω shape, an inverted trapezoid, and a rectangle.

3. A double-conveying direct cooling plate with spiral capillaries as claimed in claim 1, characterized in that: At least one spoiler protrusion is provided on the heat insulation layer.

4. A double-conveying direct cooling plate with spiral capillaries as claimed in claim 1, characterized in that: The cross section of the groove is one of an inverted trapezoid, an arc, and a rectangle.

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