Liquid cooling plate and battery pack

Abstract

The utility model provides a kind of liquid cooling plate and battery pack, wherein, liquid cooling plate includes flow channel plate, plane plate and turbulence protrusion, flow channel cavity is provided with to one side protruding on flow channel plate, plane plate is attached with flow channel plate and is formed flow channel with flow channel cavity, plane plate includes the flow channel groove being set to flow channel cavity;Flow channel groove is set in the corresponding position of flow channel on plane plate, flow channel groove is communicated with flow channel cavity, turbulence protrusion is linearly spaced and set in flow channel groove, turbulence protrusion is obliquely set along the direction of plane plate length or width direction.The utility model provides a kind of liquid cooling plate, in the process that refrigerant realizes heat dissipation by phase change mode, vaporized refrigerant meets turbulence protrusion, because of possessing bubble nucleation point, refrigerant liquefaction efficiency is higher, liquid cooling plate radiates more evenly, can avoid the flow channel dry of liquid cooling plate, improve the thermal management efficiency of battery pack, guarantee the safety and reliability of battery pack.

Description

Technical Field

[0001] This utility model relates to the field of new energy heat dissipation, and in particular to a liquid cooling plate and battery pack. Background Technology

[0002] In current power battery heat dissipation technologies, two stamped aluminum plates are often welded together to form a direct cooling plate with internal flow channels, through which the coolant flowing within the channels exchanges heat with the battery cells. Currently, the internal flow channels of these direct cooling plates typically have smooth surfaces, which suffers from low boiling heat transfer efficiency, poor temperature uniformity, and low critical heat flux density. With advancements in heat dissipation technology combining liquid cooling plates with phase change materials, the smooth surface of the flow channels lacks bubble nucleation points, making it difficult for the refrigerant to initiate phase change and resulting in insufficient heat transfer intensity. Furthermore, due to uneven heat distribution within the battery cells during use, localized gas phase accumulation easily occurs within the flow channels, forming an insulating gas film that can lead to localized overheating of the battery pack, affecting battery life and safety. Simultaneously, with the increase in battery cell energy density and under high-temperature, high-rate charging conditions, the liquid cooling plate is prone to rapid heat dissipation failure due to liquid film drying, leading to thermal runaway and significantly impacting operational safety. Therefore, there is an urgent need for a liquid cooling plate with high heat dissipation efficiency and low cost to improve performance and reliability. Utility Model Content

[0003] The purpose of this invention is to provide a liquid cooling plate and battery pack, which have the advantages of simple structure, high reliability, fast heat dissipation and low manufacturing cost.

[0004] According to one aspect of the present invention, a liquid cooling plate is provided, comprising:

[0005] A flow channel plate, wherein the flow channel plate is provided with a flow channel cavity protruding to one side;

[0006] A planar plate, wherein the planar plate is fitted to the flow channel plate and forms a flow channel with the flow channel cavity, and the planar plate includes a flow channel groove disposed relative to the flow channel cavity;

[0007] The flow channel groove is provided at the corresponding position of the flow channel on the flat plate, and the flow channel groove is in communication with the flow channel cavity;

[0008] The turbulence protrusions are arranged linearly at intervals within the flow channel groove, and are obliquely arranged along the length or width of the planar plate.

[0009] By setting flow channel grooves and turbulence protrusions on the flat plate, the vaporized refrigerant has a higher liquefaction efficiency when encountering turbulence protrusions during the refrigerant phase change heat dissipation process, and the heat dissipation of the liquid cooling plate is more uniform.

[0010] Preferably, the turbulence protrusion is shaped as a straight line, a curve, or a dashed line.

[0011] Preferably, the turbulence protrusion intersects with one side or both sides of the flow channel cavity.

[0012] Preferably, the height of the turbulence protrusion is greater than 0.1 mm and less than 0.8 mm.

[0013] Preferably, the height of the turbulence protrusion is lower than the height of the flow channel groove, and the distance between two adjacent turbulence protrusions is greater than 1.5 times the height of the turbulence protrusion and less than 5 times the height of the turbulence protrusion.

[0014] Preferably, the cross-section of the turbulence protrusion is conical, trapezoidal, or arc-shaped.

[0015] Preferably, the planar plate is further provided with a liquid inlet and a liquid outlet, the diameter of the liquid inlet is smaller than the diameter of the liquid outlet, and the water inlet is located on the other side of the planar plate where the flow channel groove is located.

[0016] Preferably, the flow channel includes a liquid inlet, the liquid inlet is disposed at the end of the liquid inlet, and the liquid outlet is disposed on the flow channel corresponding to the periphery of the liquid inlet.

[0017] The liquid cooling plate provided by this utility model, by setting flow channel grooves and turbulence protrusions on the flat plate, provides a large number of stable bubble nucleation points during the heat dissipation process, which can significantly reduce the boiling temperature of the refrigerant and improve the heat transfer coefficient. At the same time, the inclined linear turbulence protrusions can effectively guide and separate the airflow and liquid flow of the refrigerant, avoid the gas phase covering the heat transfer surface, ensure that the flow channel is continuously wetted by the liquid, thereby delaying the drying of the flow channel and significantly improving the critical heat flux density.

[0018] The embodiment also provides a battery pack including a liquid cooling plate as described in any of the above embodiments. The battery pack provided by this utility model uses a phase-liquid change mode for heat dissipation, resulting in more uniform heat dissipation and advantages such as high safety and reliability, and light weight. Attached Figure Description

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] Figure 1 A schematic diagram of a liquid cooling plate structure provided by this utility model.

[0021] Figure 2 This is a cross-sectional schematic diagram of a liquid cooling plate provided by this utility model.

[0022] Figure 3 for Figure 2 Enlarged schematic diagram of part B.

[0023] Figure 4A schematic diagram of a planar plate provided by this utility model.

[0024] Figure 5 for Figure 4 Enlarged schematic diagram of part C.

[0025] Explanation of icon numbers:

[0026] 100-Liquid cooling plate; 10-Flow channel plate; 11-Flow channel cavity; 12-Liquid inlet; 13-Liquid outlet; 20-Flat plate; 21-Flow channel; 22-Flow channel groove; 221-First side; 222-Second side; 22a-Liquid inlet groove; 23-Turbulence protrusion; 30-Water inlet interface. Detailed Implementation

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0029] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0033] See Figures 1 to 5 As shown, the embodiment provides a liquid cooling plate that uses phase change heat dissipation to achieve heat dissipation of the power battery. The liquid cooling plate includes a flow channel plate 10 and a flat plate 20. One side of the flat plate 20 is bonded to the battery cell. The flow channel plate 10 has a flow channel cavity 11 protruding to one side. The flat plate 20 is bonded to the flow channel plate 10, and a flow channel is formed between the flat plate 20 and the flow channel cavity 11 on the flow channel plate 10. During the heat dissipation of the battery cell, the refrigerant flows in the flow channel to achieve heat exchange. The flat plate 20 also includes a flow channel groove 22, which is located on the side of the flat plate 20 that is bonded to the flow channel plate 10. The position of the flow channel groove 22 on the flat plate 20 corresponds to the position of the flow channel cavity 11, and the flow channel groove 22 communicates with the flow channel cavity 11. The flow channel plate 10 and the flat plate 20 are bonded together by stamping and brazing to ensure the airtightness of the flow channel cavity 11. The flow channel 22 is also provided with turbulence protrusions 23. The turbulence protrusions 23 are linear and uniformly arranged in the flow channel 22. The turbulence protrusions 23 are obliquely arranged along the length or width direction of the flat plate 20. The turbulence protrusions 23 are distributed in the flow channel 22 along the direction of the flow channel, thereby achieving their function within the entire flow channel of the liquid cooling plate and ensuring the reliability of heat exchange. In this embodiment, the flat plate 20 is formed by stamping with a specific mold to form the flow channel 22 and the turbulence protrusions 23. To prevent the position from shifting with the flow channel cavity 11 on the flow channel plate 10 during brazing, positioning pins are used to fix the mold to the flat plate 20 during the stamping process. In other forming methods of the flat plate 20, it can also be formed by roll forming, chemical etching, laser processing, etc. The advantage of using mold stamping is that it can avoid the burrs generated in roll forming and laser processing that cause subsequent flow channel blockage. In addition, when using chemical etching, the etching solution may not be cleaned properly and react with the refrigerant, affecting the heat dissipation effect. The advantage of setting the turbulence protrusion 23 is that it turbulents the refrigerant flowing in the flow channel, so that it can fully vaporize and absorb heat during the heat dissipation process of the battery cell. At the same time, it can also provide stable bubble nucleation points for the refrigerant, significantly reduce the boiling initiation superheat, greatly promote nucleation boiling, and improve the heat transfer coefficient.

[0034] In specific embodiments, the turbulence protrusion 23 is arranged in the shape of a straight line, a curve, or a dashed line. In the flow channel, the function of the turbulence protrusion 23 is to improve boiling heat transfer efficiency, ensure uniform heat transfer temperature within the liquid cooling plate, and prevent localized gas accumulation within the flow channel, which could lead to the formation of an insulating gas film and localized overheating of the liquid cooling plate. When the turbulence protrusion 23 is a straight line, it effectively guides and separates the airflow and liquid flow, preventing gas from covering the heating surface and ensuring the wall surface remains continuously wetted by the liquid, thereby delaying drying and significantly increasing the critical heat flux density. When the shape of the turbulence protrusion 23 is set as a curve, the refrigerant flowing in the flow channel slows down as it passes over the turbulence protrusion 23, thereby ensuring that the refrigerant fully absorbs the heat from the battery cell and improves heat dissipation efficiency. When the turbulence protrusion 23 is set in a dashed line shape, it is equivalent to a uniformly distributed dot array. Therefore, when the refrigerant passes through, it can ensure that there are a sufficient number of bubble nucleation points, thereby improving the refrigerant liquefaction rate and ensuring the heat exchange efficiency of the battery pack. In a specific embodiment, the turbulence protrusion 23 intersects with one side or both sides of the flow channel cavity 11. The flow channel groove 22 is set as the bottom of the flow channel groove 22, with a first side 221 and a second side 222. The turbulence protrusion 23 is set on the bottom of the flow channel groove 22. In an optional embodiment, the two sides of the turbulence protrusion 23 are connected to the first side 221 and the second side 222. In this case, the refrigerant has the most bubble nucleation points when passing through the flow channel, resulting in the best heat exchange efficiency. In another optional embodiment, only one end of the turbulence protrusion 23 is connected to the first side 221, or only one end is connected to the second side 222. When the refrigerant passes through the turbulence protrusion 23, the heat dissipation effect is also improved due to the presence of some bubble nucleation points. Furthermore, within the flow channel 22, the turbulence protrusion 23 can also be configured as a combination or region where one end of the turbulence protrusion 23 is connected to the first side 221 and the other end is connected to the second side 222. In this configuration, the refrigerant can remain sufficiently within the flow channel to ensure improved heat dissipation. Preferably, the cross-section of the turbulence protrusion 23 is conical, trapezoidal, or arc-shaped. When configured with the geometry described above, sufficient contact interface between the turbulence protrusion 23 and the refrigerant can be ensured, thereby improving heat exchange efficiency.

[0035] In the implementation, when the height of the turbulence protrusion 23 is set to be between 0.1 mm and 0.8 mm, the heat exchange efficiency can be increased by up to 20%, and the height of the turbulence protrusion 23 is lower than the height of the flow channel groove 22; when the distance between two adjacent turbulence protrusions 23 is greater than 1.5 times the height of the turbulence protrusion 23 and less than 5 times the height of the turbulence protrusion 23, the heat exchange efficiency can also be increased by up to 20%.

[0036] Example 1:

[0037]

[0038]

[0039] Example 1 illustrates that when the height of the turbulence protrusion 23 and the spacing between two adjacent turbulence protrusions 23 are consistent, changing the shape of the turbulence protrusion 23 can also improve heat dissipation efficiency. The heat dissipation efficiency is maximized when the shape of the turbulence protrusion 23 is curved. Example 1 also illustrates the improvement in heat dissipation efficiency when the turbulence protrusion 23 is not connected to the first side 221 and the second side 222 of the flow channel 22. In this case, since the width portion of the flow channel 22 has bubble nucleation points, heat dissipation efficiency can also be improved.

[0040] Example 2:

[0041]

[0042] Example 2 illustrates the improvement in heat dissipation when the spacing between two adjacent turbulence protrusions 23 is adjusted. When the height and shape of the turbulence protrusions 23 remain unchanged, a 20% improvement in heat dissipation efficiency can be achieved when the spacing between two adjacent turbulence protrusions 23 is doubled.

[0043] Example 3:

[0044]

[0045]

[0046] Example 3 illustrates that when the turbulence protrusions 23 have the same shape and the distance between two adjacent turbulence protrusions 23 is twice the height of the turbulence protrusion 23, the heat dissipation efficiency can be improved by 20% when the height of the turbulence protrusion 23 is 0.1 mm.

[0047] The liquid cooling plate 100 provided in this embodiment is further provided with a liquid inlet 12 and a liquid outlet 13. The liquid inlet 12 and the liquid outlet 13 are disposed on the flat plate 20. The water inlet 30 is connected to the liquid inlet 12 and the liquid outlet 13, and the water inlet 30 is disposed on the other side of the flow channel groove 22 on the flat plate 20. Due to the high gas pressure in the flow channel and the fast refrigerant flow rate at the lower temperature, in order to maintain the liquid inlet and outlet balance in the flow channel, the diameter of the liquid inlet 12 is smaller than the diameter of the liquid outlet 13 to ensure that the flow channel is always kept moist and to avoid thermal runaway of the battery pack. The flow channel groove 22 is provided with a liquid inlet groove 22a. The liquid inlet 12 is disposed at the end of the liquid inlet groove 22a so that the flat plate 20 can contact the battery cells and arrange more battery cells. The liquid outlet 13 is disposed on the flow channel groove 22 surrounding the liquid inlet 12 so as to facilitate the placement of the water inlet 30 and reduce the space occupied by the water inlet 30 for battery cell placement.

[0048] The liquid cooling plate 100 provided in this embodiment of the invention achieves uniform heat dissipation and improves the heat exchange efficiency of the liquid cooling plate 100 by setting flow channel grooves 22 on the flat plate 20 corresponding to the flow channel cavity 11, and uniformly distributing turbulence protrusions 23 within the flow channel grooves 22. The turbulence protrusions 23, inclinedly arranged within the flow channel grooves 22, can effectively guide and separate the airflow and liquid flow of the refrigerant, ensuring that the flow channel is continuously wetted by liquid, thereby increasing the critical heat flux density while providing bubble nucleation points. When the liquid cooling plate 100 provided in this invention is applied to a battery pack, it can make the heat dissipation of the battery cells uniform, avoid thermal runaway, and significantly improve the safety of the battery pack. At the same time, since the liquid cooling plate 100 uses a phase-liquid change mode for heat dissipation, it reduces the amount of liquid refrigerant added, thus reducing the mass of the battery pack.

[0049] It will be apparent to those skilled in the art that various modifications and variations can be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention cover modifications and variations falling within the scope of the appended claims and their equivalents.

Claims

1. A liquid-cooled plate, characterized in that, include: A flow channel plate, wherein the flow channel plate is provided with a flow channel cavity protruding to one side; A planar plate, wherein the planar plate is fitted to the flow channel plate and forms a flow channel with the flow channel cavity, and the planar plate includes a flow channel groove disposed relative to the flow channel cavity; The flow channel groove is provided at the corresponding position of the flow channel on the flat plate, and the flow channel groove is in communication with the flow channel cavity; The turbulence protrusions are arranged linearly at intervals within the flow channel groove, and are obliquely arranged along the length or width of the planar plate.

2. A liquid-cooled plate as described in claim 1, characterized in that, The turbulence protrusions are configured in the shape of straight lines, curves, or dashed lines.

3. A liquid cooling plate as described in claim 2, characterized in that, The turbulence protrusion intersects with one side or both sides of the flow channel cavity.

4. A liquid-cooled plate as described in claim 3, characterized in that, The height of the turbulence protrusion is greater than 0.1 mm and less than 0.8 mm.

5. A liquid-cooled plate as described in claim 4, characterized in that, The height of the turbulence protrusion is lower than the height of the flow channel groove, and the distance between two adjacent turbulence protrusions is greater than 1.5 times the height of the turbulence protrusion and less than 5 times the height of the turbulence protrusion.

6. A liquid-cooled plate as described in claim 5, characterized in that, The cross-section of the turbulence protrusion is conical, trapezoidal, or arc-shaped.

7. A liquid-cooled plate as described in claim 6, characterized in that, The flat plate is also provided with a liquid inlet and a liquid outlet. The diameter of the liquid inlet is smaller than the diameter of the liquid outlet. The water inlet is located on the other side of the flat plate where the flow channel groove is located.

8. A liquid cooling plate as described in claim 7, characterized in that, The flow channel includes an inlet channel, the inlet is located at the end of the inlet channel, and the outlet is located on the flow channel corresponding to the periphery of the inlet.

9. A battery pack, characterized in that, Including the liquid cooling plate as described in any one of claims 1-8 above.

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