A cold plate

Abstract

A cold plate relates to the technical field of power battery heat dissipation, and is used for increasing the contact area of cooling liquid and ensuring the uniformity of cooling liquid flow. The cold plate comprises an upper plate body, a lower plate body and a flow channel arranged between the upper plate body and the lower plate body, the upper plate body and the lower plate body are sealingly connected, the flow channel is arranged on the plate surface of the lower plate body facing the upper plate body, and the two ends of the flow channel pass through one side of the lower plate body to form a liquid inlet and a liquid outlet; further comprising a strip-shaped groove arranged on the plate surface of the upper plate body facing the lower plate body, the strip-shaped groove is arranged in multiple, the multiple strip-shaped grooves are distributed at intervals, the strip-shaped groove is communicated with the flow channel, and the strip-shaped groove is used for increasing the contact area between the upper plate body and the cooling liquid flowing in the flow channel. According to the scheme, the cooling liquid can flow into the strip-shaped groove through the flow channel, the contact area between the upper plate body and the cooling liquid is increased, and the heat dissipation effect is improved.

Description

Technical Field

[0001] This application relates to the field of power battery heat dissipation technology, and in particular to a cold plate. Background Technology

[0002] With the development of high-power and miniaturization of power batteries, the heat generated during their operation has increased dramatically. If the heat cannot be dissipated in time, it will lead to increased component temperature, performance degradation, or even damage.

[0003] Cold plates, as highly efficient heat dissipation components, remove heat through the circulation of coolant within the flow channels and are widely used in various electronic devices. Existing cold plates mostly employ a flat plate + flow channel structure, resulting in limited contact area between the coolant and the cold plate body and low thermal conductivity. Utility Model Content

[0004] This application provides a cold plate for increasing the contact area between the coolant and the cold plate.

[0005] This application provides a cooling plate, including an upper plate, a lower plate, and a flow channel disposed between the upper plate and the lower plate. The upper plate and the lower plate are sealed together. The flow channel is formed on the plate surface of the lower plate facing the upper plate, and the two ends of the flow channel pass through one side of the lower plate to form a liquid inlet and a liquid outlet. It also includes a strip groove disposed on the plate surface of the upper plate facing the lower plate. The strip groove is provided in multiple ways and is distributed at intervals. The strip groove is connected to the flow channel and is used to increase the contact area between the upper plate and the coolant flowing in the flow channel.

[0006] This application uses a sealing design to prevent coolant leakage from the gaps between the plates, ensuring that the coolant can form a stable circulation within the flow channel, providing a basis for heat dissipation; the flow channel provides a dedicated flow path for the coolant, avoiding disorderly flow of coolant between the plates; the inlet and outlet are concentrated on the same side, facilitating connection with external coolant pipelines.

[0007] Multiple strip grooves are set on the upper plate, and after the strip grooves are connected to the flow channel, the coolant can enter the groove, so that the heat of the upper plate can be transferred to the coolant through the groove wall, groove bottom and flow channel in multiple dimensions, which greatly increases the contact area and directly improves the heat exchange effect.

[0008] The upper plate has a strip groove machined on its surface facing the lower plate, and the groove is connected to the flow channel. By changing the cross-sectional area in the direction of coolant flow, the laminar flow of coolant is broken, and turbulence is actively induced. This can increase the local flow velocity and expand the effective area of ​​heat exchange, thereby simultaneously increasing the contact area between the upper plate and the coolant and the heat exchange efficiency of the coolant flow, thus improving the heat dissipation effect.

[0009] In some embodiments of this application, the flow channel includes multiple strip regions extending along the opening direction of the liquid inlet and a connecting area connecting two adjacent strip regions. The multiple strip regions are parallel and spaced apart, and the strip grooves extend along the opening direction of the liquid inlet. Each strip region corresponds to at least one strip groove.

[0010] Multiple parallel strip areas can distribute the coolant, ensuring that the coolant evenly covers the entire surface of the lower plate and preventing dead zones caused by insufficient coolant flow in certain areas. The spaced distribution balances the flow area and the strength of the lower plate, avoiding insufficient thickness and easy deformation of the lower plate due to overly dense flow channels. After entering from the inlet, the coolant is evenly distributed to each strip area through the connecting area, and then flows to the outlet through the connecting area at the other end, ensuring that the flow rate of each strip area is consistent.

[0011] In some embodiments of this application, the two ends of multiple strip regions are connected along the opening direction perpendicular to the liquid inlet to form two parallel strip connecting areas, and the ends of the strip grooves extend to the connecting areas.

[0012] The inner wall of the flow channel in the strip-shaped connection area is smoother, and the flow resistance is smaller when the coolant turns, which can reduce the flow loss caused by excessive resistance and ensure the stability of the coolant flow rate; the strip-shaped connection area can also increase the contact area between the flow channel and the upper plate, and improve the heat dissipation effect.

[0013] In some embodiments of this application, one strip region corresponds to four strip grooves. One strip region corresponding to four grooves can significantly increase the contact area through dense arrangement, without causing the upper plate to be too thin due to too many grooves; combined with the width of the strip region, the space of the strip region can be fully filled, avoiding blank areas in the flow channel and maximizing heat exchange efficiency.

[0014] In some embodiments of this application, the four strip grooves corresponding to each strip region are identical, and the width of the strip grooves is the same. Identical grooves with consistent width simplify the CNC milling process and facilitate machining. Simultaneously, grooves with the same width ensure consistent flow resistance of the coolant in each groove, avoiding differences in flow velocity between wide and narrow grooves, thus balancing the heat exchange efficiency of each groove and preventing uneven heat dissipation caused by abnormal local flow velocities.

[0015] In some embodiments of this application, one strip region corresponds to four strip grooves, namely a first groove, a second groove, a third groove, and a fourth groove. The distance between the first groove and the second groove is the same as the distance between the third groove and the fourth groove. The second groove and the third groove are adjacent to each other, and the distance between the second groove and the third groove is greater than the distance between the first groove and the second groove.

[0016] The small spacing between the first and second tanks and the third and fourth tanks allows for dense arrangement of tanks on both sides of the strip area, maximizing the contact area. The large spacing between the second and third tanks allows for structural blanking in the middle of the strip area, preventing the two middle tanks from being too close and resulting in thinner tank walls. The spacing difference ensures that the four tanks are independently formed and do not interfere with each other, allowing the coolant to flow stably in each tank and further improving the uniformity of heat dissipation.

[0017] In some embodiments of this application, the opening widths of the first, second, third, and fourth grooves on the upper plate are all the same, and the distance between the second and third grooves is greater than the width of the second groove on the upper plate. The greater distance between the second and third grooves than the opening width can improve the local strength of the upper plate and avoid the risk of slight deformation of the plate during assembly or use.

[0018] In some embodiments of this application, the width of the groove is the same or gradually decreases along the depth direction of the groove. The contact area with the vertical groove wall is stable, and the heat exchange effect is predictable; the gradually smaller groove opening can enhance the turbulence effect of the coolant and improve the heat dissipation efficiency.

[0019] In some embodiments of this application, the strip groove is a square groove. Square grooves are easy to process and have easily controllable precision, which can reduce the processing cost per unit product. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0021] Figure 1 This is a schematic diagram of a cold plate provided in an embodiment of this application.

[0022] Figure 2 This is a part drawing of the lower plate of the cold plate provided in an embodiment of this application.

[0023] Figure 3 This is a part drawing of the upper plate of the cold plate provided in the embodiments of this application.

[0024] Figure 4 This is a cross-sectional schematic diagram of the cold plate provided in an embodiment of this application.

[0025] Figure 5 Provided for the embodiments of this application Figure 4 A magnified view of part A in the diagram.

[0026] Reference numerals: 1-Upper plate; 11-Strip groove; 111-First groove; 112-Second groove; 113-Third groove; 114-Fourth groove; 2-Lower plate; 21-Inlet; 22-Outlet; 23-Flow channel; 231-Strip area; 232-Connection area. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0031] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0032] With the development of high-power and miniaturization of power batteries, the heat generated during their operation has increased dramatically. If the heat cannot be dissipated in time, it will lead to increased component temperature, performance degradation, or even damage.

[0033] Cold plates, as highly efficient heat dissipation components, remove heat through the circulation of coolant within the flow channels and are widely used in various electronic devices. Existing cold plates mostly employ a flat plate + flow channel structure, resulting in limited contact area between the coolant and the cold plate body and low thermal conductivity.

[0034] Therefore, this application provides a cold plate, please refer to... Figure 1 It includes an upper plate 1, a lower plate 2, and a flow channel 23 disposed between the upper plate 1 and the lower plate 2. The upper plate 1 and the lower plate 2 are sealed together. Please refer to [reference needed]. Figure 2 The flow channel 23 is opened on the plate surface of the lower plate 2 facing the upper plate 1, and the two ends of the flow channel 23 pass through one side of the lower plate 2 to form an inlet 21 and an outlet 22.

[0035] Please refer to Figure 3 The cold plate also includes a strip groove 11 disposed on the plate surface of the upper plate 1 facing the lower plate 2. Multiple strip grooves 11 are provided and distributed at intervals. The strip grooves 11 are connected to the flow channel 23. The strip grooves 11 are used to increase the contact area between the upper plate 1 and the coolant flowing in the flow channel 23.

[0036] Please refer to Figure 1-3 This application uses a sealing design to prevent coolant leakage from the gaps between the plates, ensuring that the coolant in the flow channel 23 can form a stable circulation, providing a basis for heat dissipation; the flow channel 23 provides a dedicated flow path for the coolant, avoiding disorderly flow of coolant between the plates; the inlet and outlet ports 22 are concentrated on the same side, which facilitates connection with external coolant pipelines.

[0037] Please refer to Figure 3 Multiple slots 11 are provided on the upper plate 1, please refer to... Figure 4 Furthermore, after the strip groove 11 is connected to the flow channel 23, the coolant can enter the tank, allowing the heat of the upper plate 1 to be transferred to the coolant through the tank wall, tank bottom, and flow channel 23 in multiple dimensions, greatly increasing the contact area and directly improving the heat exchange effect.

[0038] Please refer to Figure 4 The upper plate 1 has a strip groove 11 machined on its surface facing the lower plate 2, and the groove is connected to the flow channel 23. By changing the cross-sectional area in the direction of coolant flow, the laminar flow state of the coolant is broken, and turbulence is actively induced. This can increase the local flow velocity and expand the effective area of ​​heat exchange, thereby simultaneously increasing the contact area between the upper plate 1 and the coolant and the heat exchange efficiency of the coolant flow, thus improving the heat dissipation effect.

[0039] For example, the cold plate is mostly installed inside the battery box of the power battery, and the battery cells of the power battery are in contact with the surface of the upper plate 1 of the cold plate, thereby ensuring the heat exchange effect.

[0040] Please refer to Figure 1 Both the upper plate 1 and the lower plate 2 need to be made of materials with good thermal conductivity, such as metal materials, like aluminum alloy. The upper plate 1 and the lower plate 2 need to be sealed together. Therefore, the surfaces of the upper plate 1 and the lower plate 2 can be attached together and welded around the edge to ensure the sealing effect. Welding grooves can be reserved during welding, or corresponding recesses and protrusions can be set between the upper plate 1 and the lower plate 2 to ensure stable positioning and good welding effect.

[0041] Please refer to Figure 1 For example, both the inlet 21 and the outlet 22 can be circular or square holes. The inlet 21 and the outlet 22 can be located only on the lower plate 2, or the strip groove 11 on the upper plate 1 located in the area of ​​the inlet 21 and the outlet 22 can extend to the inlet 21 and the outlet 22. The inlet 21 and the outlet 22 can be located on the same side wall of the lower plate 2, and they are distributed at intervals.

[0042] Furthermore, the area connected to the cold plate flow channel 23 should be limited to the inlet 21 and outlet 22, as well as the strip groove 11 that may extend to the area of ​​the inlet 21 or outlet 22. The flow channels 23 or strip grooves 11 in other areas should be located inside the upper plate 1 and the lower plate 2 to ensure the coolant flows in a sealed manner.

[0043] For example, the function of the cold plate can be heat dissipation and heating. Therefore, the coolant flowing in the flow channel 23 can have both cooling and heating functions, that is, preheating the battery and cell when the temperature is low to ensure the working environment temperature of the power battery.

[0044] Please refer to Figure 2 In some examples, the flow channel 23 includes multiple strip regions 231 extending along the opening direction of the inlet 21 and a connecting area 232 connecting two adjacent strip regions 231. The multiple strip regions 231 are parallel and spaced apart. The strip grooves 11 extend along the opening direction of the inlet 21. One strip region 231 corresponds to at least one strip groove 11.

[0045] Multiple parallel strip regions 231 can distribute the coolant, ensuring that the coolant evenly covers the entire surface of the lower plate 2, preventing local areas from having no coolant flow and forming heat dissipation dead zones; the spaced distribution balances the flow area and the strength of the lower plate 2, avoiding the lower plate 2 from being too thin and easily deformed due to overly dense flow channels 23; after entering from the inlet 21, the coolant is evenly distributed to each strip region 231 through the connecting area 232, and then flows to the outlet 22 through the other connecting area 232, ensuring that the flow rate of each strip region 231 is consistent.

[0046] For example, the strip regions 231 can be S-shaped and connected end to end, or they can be grid-like or multiple strip structures that are connected end to end, so as to ensure that the coolant can flow to each strip region 231.

[0047] Please refer to Figure 2 Multiple strip regions 231 can be identical, and one end of two of the spaced strip regions 231 can penetrate the surface of the lower plate 2 to form a liquid inlet 21 and a liquid outlet 22. These two strip regions 231 can be located at two ends of the strip regions 231, or they can be other strip regions 231. In this case, the flow channel 23 needs to be further designed to ensure the flow and circulation of coolant in each strip region 231.

[0048] Please refer to Figure 2 In some examples, along the opening direction perpendicular to the inlet 21, the two ends of multiple strip regions 231 are connected to form two parallel strip connecting areas 232, and the ends of the strip groove 11 extend to the connecting area 232.

[0049] The inner wall of the flow channel 23 in the strip-shaped connection area 232 is smoother, and the flow resistance is smaller when the coolant turns, which can reduce the flow loss caused by excessive resistance and ensure the stability of the coolant flow rate; the strip-shaped connection area 232 can also increase the contact area between the flow channel 23 and the upper plate 1, and improve the heat dissipation effect.

[0050] Please refer to Figure 2 For example, the width of the strip connection area 232 can be equal to or greater than the width of the strip area 231. The inlet 21 and the outlet 22 can be connected to the same strip connection area 232, or they can be connected to two different strip connection areas 232 respectively.

[0051] In some other examples, a through area is provided in the middle of the strip region 231, which is another strip connecting area 232, thereby further increasing the contact area between the flow channel 23 and the upper plate 1.

[0052] Please refer to Figure 5 In some examples, one strip region 231 corresponds to four strip slots 11. One strip region 231 corresponds to four slots, which can greatly increase the contact area through dense arrangement, and avoid the upper plate 1 being too thin due to too many slots; combined with the width of the strip region 231, the space of the strip region 231 can be fully filled, avoiding the existence of blank areas in the flow channel 23, and maximizing the heat exchange efficiency.

[0053] Alternatively, one strip region 231 can correspond to two strip slots 11, or three strip slots 11, or five strip slots 11.

[0054] Please refer to Figure 5 In some examples, the four strip grooves 11 corresponding to each strip region 231 are identical, and the width of the strip grooves 11 is the same. The identical grooves and consistent widths simplify the CNC milling process and facilitate machining. At the same time, the grooves with the same width ensure that the flow resistance of the coolant in each groove is consistent, avoiding the difference in flow rate between wide grooves and narrow grooves, so as to balance the heat exchange efficiency of each groove and prevent uneven heat dissipation caused by abnormal local flow rates.

[0055] For example, the fact that the four strip grooves 11 are the same here can mean that the strip grooves 11 have the same cross-sectional shape, the same length, the same width, the same depth, or all of the above features are the same.

[0056] Please refer to Figure 5 In some examples, one strip region 231 corresponds to four strip grooves 11, namely the first groove 111, the second groove 112, the third groove 113 and the fourth groove 114. The distance between the first groove 111 and the second groove 112 is the same as the distance between the third groove 113 and the fourth groove 114. The second groove 112 and the third groove 113 are adjacent, and the distance between the second groove 112 and the third groove 113 is greater than the distance between the first groove 111 and the second groove 112.

[0057] The small spacing between the first and second tanks and the third and fourth tanks allows for dense arrangement of tanks on both sides of the strip area 231, maximizing the contact area. The large spacing between the second and third tanks allows for a structural blank space to be reserved in the middle of the strip area 231, preventing the two middle tanks from being too close together and resulting in excessively thin tank walls. The spacing difference ensures that the four tanks are independently formed and do not interfere with each other, allowing the coolant to flow stably in each tank and further improving the uniformity of heat dissipation.

[0058] Please refer to Figure 5 For example, the first tank 111, the second tank 112, the third tank 113 and the fourth tank 114 can be four strip grooves 11 distributed sequentially along the width direction of the strip groove 11. This direction can be from the liquid inlet 21 to the liquid outlet 22, or from the liquid outlet 22 to the liquid inlet 21.

[0059] Please refer to Figure 5 In some examples, the opening widths of the first groove 111, the second groove 112, the third groove 113, and the fourth groove 114 on the surface of the upper plate 1 are all the same. The distance between the second groove 112 and the third groove 113 is greater than the width of the second groove 112 on the surface of the upper plate 1. The distance between the second and third grooves being greater than the opening width of the grooves can improve the local strength of the upper plate 1 and avoid the risk of slight deformation of the plate during assembly or use.

[0060] For example, the width between the first groove 111 and the second groove 112, and between the third groove 113 and the fourth groove 114, can be less than or equal to the width of the second groove 112 on the surface of the upper plate 1.

[0061] The opening width of the groove on the upper plate 1 is the same as the width of the groove on the upper plate 1, both being the opening size of the groove along the vertical and extension directions.

[0062] Please refer to Figure 5 In some examples, the width of the groove 11 is the same or gradually decreases along the depth direction of the groove 11. The contact area with the vertical groove wall is stable, and the heat exchange effect is predictable; the gradually smaller opening of the groove 11 can enhance the turbulence effect of the coolant and improve the heat dissipation efficiency.

[0063] For example, the strip groove 11 can be square, or it can be an arc groove, a semi-circular groove, or a V-shaped groove.

[0064] Please refer to Figure 5 In some examples, the strip groove 11 is a square groove. Square grooves are easy to process and have easy precision control, which can reduce the processing cost per unit product.

[0065] In some examples, a cold plate includes an upper plate body 1, a lower plate body 2, a flow channel 23, and a strip groove 11.

[0066] The upper plate 1 can be made of aluminum alloy with a thermal conductivity ≥160W / (m・K) (such as 6061 or 5052 aluminum alloy), and its shape can be a rectangular flat plate with a flat surface to fit the components to be cooled (such as the heat dissipation surface of electronic components or the cells of power batteries). A strip groove 11 is machined on the side of the upper plate 1 facing the lower plate 2. The groove and the flow channel 23 of the lower plate 2 form a communicating space for conducting the heat absorbed by the upper plate 1 to the coolant, or transferring the heat in the coolant to the upper cooling plate.

[0067] The lower plate 2 can be made of the same material as the upper plate 1 (to ensure consistent thermal conductivity), and its shape matches that of the upper plate 1. A flow channel 23 is provided on one side of the plate facing the upper plate 1. Both ends of the flow channel 23 are connected along the same edge of the lower plate 2 to form a square liquid inlet 21 and a liquid outlet 22.

[0068] The lower plate 2 and the upper plate 1 are fixed by a sealed connection. The edges can be sealed by laser welding and can also be fastened by bolts. A fluororubber sealing gasket can be installed between the bolts and the plate.

[0069] The flow channel 23 is the flow channel for coolant, and its overall distribution can be in a "U" shape, including multiple strip areas 231 and two connecting areas 232. The strip areas 231 extend along the opening direction of the inlet 21, and the number can be 5-15. The strip areas 231 are parallel and spaced apart. The connecting areas 232 can be strip structures, extending perpendicular to the opening direction of the inlet 21, and are located at both ends of the strip areas 231, connecting all the strip areas 231 to form a flow path. After the coolant enters from the inlet 21, it is distributed to each strip area 231 through one end of the connecting area 232, and then flows to the outlet 22 through the other end of the connecting area 232, ensuring that the coolant evenly covers the entire surface of the lower plate 2.

[0070] The strip groove 11 is formed on the surface of the upper plate 1 facing the lower plate 2 and is connected to the flow channel 23 (when the upper plate 1 and the lower plate 2 are sealed together, the groove opening of the strip groove 11 and the groove wall of the flow channel 23 form a continuous contact space), which is used to increase the contact area between the upper plate 1 and the coolant.

[0071] The number of strip grooves 11 matches the number of strip regions 231 of the flow channel 23. Each strip region 231 can correspond to 4 strip grooves 11 (which can be the first groove 111, the second groove 112, the third groove 113, and the fourth groove 114, respectively). Each strip groove 11 extends along the opening direction of the liquid inlet 21 and is distributed at intervals.

[0072] The distance between the first groove 111 and the second groove 112 is equal to the distance between the third groove 113 and the fourth groove 114. The second groove 112 and the third groove 113 are adjacent and the distance between them is greater than the distance between the first groove 111 and the second groove 112. The opening width of each strip groove 11 is the same, and the distance between the second groove 112 and the third groove 113 is greater than the opening width of the groove. The width of the groove can be set to be the same along the depth direction of the strip groove 11.

[0073] In some examples, this application provides an embodiment 1 in which the upper plate 1 and the lower plate 2 of the cold plate are both made of 6061 aluminum alloy and are rectangular flat plates with a shape of 250mm×200mm. The upper plate 1 has a thickness of 10mm and the lower plate 2 has a thickness of 12mm.

[0074] A flow channel 23 is formed on the surface of the lower plate 2 facing the upper plate 1 by CNC milling. The flow channel 23 includes 6 strip-shaped areas 231 and 2 connecting areas 232. The strip-shaped areas 231 extend horizontally (in the direction of the opening of the liquid inlet 21), each strip-shaped area 231 is 10mm wide, and the distance between adjacent strip-shaped areas 231 is 6mm. The connecting areas 232 extend vertically, are 8mm wide, are located at the left and right ends of the strip-shaped areas 231, and connect adjacent strip-shaped areas 231. The flow channel 23 is 5mm deep, and its two ends pass through the left edge of the lower plate 2 to form a liquid inlet 21 and a liquid outlet 22. The diameter of the liquid inlet 21 and the liquid outlet 22 is 8mm, and the inner wall is machined with M10 internal threads.

[0075] A strip groove 11 is milled on the surface of the upper plate 1 facing the lower plate 2. Each strip area 231 corresponds to 4 square strip grooves 11 (with the same width in the depth direction). The opening width of the strip groove 11 is 3mm and the depth is 4mm. The distance between the first groove 111 and the second groove 112 is 2mm, the distance between the third groove 113 and the fourth groove 114 is 2mm, the distance between the second groove 112 and the third groove 113 is 5mm, and the distance between the second groove 112 and the third groove 113 (5mm) is greater than the opening width of the groove (3mm).

[0076] The upper plate 1 and the lower plate 2 are sealed by laser welding. The weld seam is set along the perimeter of the plate and is 1.5mm wide. After welding, an airtightness test is performed (pressure 0.8MPa, pressure holding for 30 minutes without leakage).

[0077] The coolant (ethylene glycol aqueous solution with a thermal conductivity of 0.58 W / (m·K)) enters from the inlet 21, is distributed to six strip regions 231 via the left connecting area 232, and flows in the strip regions 231 to fully contact the walls and bottom of the strip grooves 11, absorbing the heat transferred from the upper plate 1. After converging in the right connecting area 232, it flows out from the outlet 22, completing the heat dissipation cycle.

[0078] In some examples, this application provides a second embodiment, which differs from the first embodiment in the shape of the strip groove 11, the sealing connection method, and some parameters, while the rest of the structure is the same as the first embodiment.

[0079] The strip groove 11 is designed as a trapezoidal groove with a width that gradually decreases along the depth direction (opening width 3mm, bottom width 2mm) and a depth of 4mm. This design can enhance the turbulence effect of the coolant in the groove, improve the heat exchange efficiency, and make it easier to remove chips during the processing of the trapezoidal groove, thus reducing the processing difficulty.

[0080] The upper plate 1 and the lower plate 2 are connected by bolts and gaskets. Six bolt holes with a diameter of 5 mm are evenly opened around the perimeter of the upper plate 1 and the lower plate 2 (the center of the hole is 10 mm away from the edge of the plate). M4 stainless steel bolts are used to pass through the bolt holes. Fluororubber gaskets with a thickness of 1.2 mm are installed between the bolts and the upper plate 1 and the lower plate 2 respectively. The bolt tightening torque is 8 N·m to ensure reliable sealing.

[0081] O-rings are installed at the ends of the inlet 21 and outlet 22. When connecting coolant lines, the sealing rings further enhance the sealing of the lines and interfaces, preventing coolant leakage.

[0082] In this embodiment, the trapezoidal strip groove 11 allows for more thorough contact between the coolant and the groove wall, and the bolt connection method facilitates disassembly and maintenance in the future, making it suitable for scenarios where the interior of the cold plate needs to be inspected regularly (such as industrial control equipment).

[0083] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0084] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A cold-rolled steel plate, characterized in that, It includes an upper plate, a lower plate, and a flow channel disposed between the upper plate and the lower plate. The upper plate and the lower plate are sealed together. The flow channel is opened on the plate surface of the lower plate facing the upper plate, and the two ends of the flow channel pass through one side of the lower plate to form an inlet and an outlet. It also includes strip grooves disposed on the surface of the upper plate facing the lower plate. There are multiple strip grooves, which are distributed at intervals. The strip grooves are connected to the flow channel and are used to increase the contact area between the upper plate and the coolant flowing in the flow channel.

2. The cold-rolled plate according to claim 1, characterized in that, The flow channel includes multiple strip-shaped regions extending along the opening direction of the liquid inlet and a connecting area connecting two adjacent strip-shaped regions. The multiple strip-shaped regions are parallel and spaced apart. The strip groove extends along the opening direction of the liquid inlet, and each strip region corresponds to at least one strip groove.

3. The cold-rolled plate according to claim 2, characterized in that, Along the opening direction perpendicular to the liquid inlet, the two ends of the plurality of strip regions are connected to form two parallel strip connecting areas, and the ends of the strip grooves extend to the connecting areas.

4. The cold-rolled plate according to claim 2, characterized in that, One strip region corresponds to four strip grooves.

5. The cold-rolled plate according to claim 4, characterized in that, Each strip region has four identical strip grooves, and the width of each strip groove is the same.

6. The cold-rolled plate according to claim 4, characterized in that, One strip region corresponds to four strip grooves, namely a first groove, a second groove, a third groove, and a fourth groove. The distance between the first groove and the second groove is the same as the distance between the third groove and the fourth groove. The second groove and the third groove are adjacent to each other, and the distance between the second groove and the third groove is greater than the distance between the first groove and the second groove.

7. The cold-rolled plate according to claim 6, characterized in that, The opening widths of the first groove, the second groove, the third groove, and the fourth groove on the upper plate are all the same, and the distance between the second groove and the third groove is greater than the width of the second groove on the upper plate.

8. The cold-rolled plate according to any one of claims 1 to 7, characterized in that, Along the depth direction of the groove, the width of the groove is the same or gradually decreases.

9. The cold plate according to claim 8, characterized in that, The strip groove is a square groove.

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