Integrated cold plate based on phase change heat transfer

Abstract

The utility model relates to the technical field of battery cooling, and discloses an integrated cold plate based on phase change heat transfer, which comprises a cold plate, and the cold plate comprises a first contact surface and a second contact surface which are oppositely arranged; the heat conduction assembly comprises a first heat conduction plate and a second heat conduction plate, the first heat conduction plate is attached to the first contact surface, the second heat conduction plate is attached to the second contact surface, the first heat conduction plate can uniformly release heat to the first contact surface after being heated, and the second heat conduction plate can uniformly release heat to the second contact surface after being heated. And heat can be uniformly released to the second contact surface, and the temperature difference between the first contact surface and the second contact surface can be reduced. The integrated cold plate based on phase change heat transfer is simple in structure, good in temperature equalizing effect, easy to produce and maintain and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery cooling, and in particular relates to an integrated cold plate based on phase change heat transfer. Background Art

[0002] Since batteries generate a lot of heat when working under high load, if the heat cannot be effectively dissipated, it may lead to degraded battery performance, shortened lifespan, and even safety issues such as thermal runaway. Therefore, cold plates for battery cooling have been introduced on the market. Such cold plates are usually made of materials with good thermal conductivity (such as aluminum or copper), and are designed with flow channels inside to allow coolant (such as water or ethylene glycol mixture) to circulate. When the coolant flows through the cold plate, it absorbs and carries away the heat generated by the battery, thereby achieving a cooling effect.

[0003] Traditional battery cell heat dissipation cold plates have poor temperature uniformity due to the large temperature difference at the water inlet, which seriously affects the uniformity of the battery cell heat dissipation and, in turn, the service life of the battery cell. To address this problem, existing technologies use the principle of phase change heat transfer to improve the cold plate structure and add a heat exchange plate containing a phase change medium above the cold plate flow channel. This method improves the temperature uniformity between the cold plate and the battery cell to a certain extent, but because it is a one-sided temperature uniformity design, there is still a temperature difference on the side of the flow channel away from the heat exchange plate during the flow of the coolant. This not only limits the temperature uniformity of the cold plate, but may also affect the service life of the cold plate due to the temperature difference between the upper and lower sides. Utility Model Content

[0004] The purpose of the utility model is to address the above problems in the prior art and to provide an integrated cold plate based on phase change heat transfer with a simple structure, good temperature uniformity, easy production and maintenance, and long service life.

[0005] The purpose of the utility model can be achieved through the following technical solutions: an integrated cold plate based on phase change heat transfer, comprising:

[0006] a cold plate comprising a first contact surface and a second contact surface arranged opposite to each other;

[0007] A heat-conducting assembly, comprising a first heat-conducting plate and a second heat-conducting plate, wherein the first heat-conducting plate is in contact with the first contact surface, and the second heat-conducting plate is in contact with the second contact surface, wherein after the first heat-conducting plate is heated, it can evenly release heat to the first contact surface, and after the second heat-conducting plate is heated, it can evenly release heat to the second contact surface, and can reduce the temperature difference between the first contact surface and the second contact surface.

[0008] In the above-mentioned integrated cold plate based on phase change heat transfer, the first heat conducting plate and the second heat conducting plate are both made of phase change material, and when the first heat conducting plate and the second heat conducting plate are heated to a specified temperature, the strength of the second heat conducting plate is greater than that of the first heat conducting plate.

[0009] In the above-mentioned integrated cold plate based on phase change heat transfer, the integrated cold plate is used to cool the battery core, and when the integrated cold plate is assembled on the battery core, the side of the first heat conducting plate facing away from the first contact surface is in contact with the battery core.

[0010] In the above-mentioned integrated cold plate based on phase change heat transfer, a support structure is included. The support structure is provided on a side of the second heat conducting plate away from the second contact surface and is detachably connected to the second heat conducting plate.

[0011] In the above-mentioned integrated cold plate based on phase change heat transfer, the support structure includes a support frame, the support frame is detachably connected to the cold plate, and the size of the support frame is adapted to the size of the cold plate.

[0012] In the above-mentioned integrated cold plate based on phase change heat transfer, the support frame is provided with a placement groove for accommodating the second heat conducting plate, the placement groove is provided with a first positioning portion, and the second heat conducting plate is provided with a second positioning portion that forms a concave-convex fit with the first positioning portion.

[0013] In the above-mentioned integrated cold plate based on phase change heat transfer, the support structure further includes a plurality of transverse bars and longitudinal bars located in the placement grooves, the transverse bars and the longitudinal bars are arranged crosswise and form a plurality of through holes penetrating the placement grooves.

[0014] In the above-mentioned integrated cold plate based on phase change heat transfer, the horizontal bar and the vertical bar are in an X-shape, and the vertical bar protrudes in a direction higher than the upper surface of the horizontal bar to form the second positioning portion.

[0015] In the above-mentioned integrated cold plate based on phase change heat transfer, a heating film is further provided between the support structure and the second heat conducting plate. One side of the heating film is bonded to the support structure, and the other side is bonded to the second heat conducting plate.

[0016] In the above-mentioned integrated cold plate based on phase change heat transfer, a sealing structure is included. The sealing structure is detachably arranged on the side of the supporting structure away from the second heat conducting plate, and a cavity is formed between the sealing structure and the supporting structure. An insulation layer is provided on the sealing structure.

[0017] Compared with the prior art, the present invention has the following beneficial effects: by providing a first heat conducting plate that is bonded to the first contact surface of the cold plate, and a second heat conducting plate that is bonded to the second contact surface of the cold plate, and allowing the first and second heat conducting plates to release heat evenly to the first and second contact surfaces respectively after being heated, the temperature difference between the first and second contact surfaces is reduced. This design effectively reduces the temperature difference between the upper and lower sides of the cold plate during the flow of coolant. On the one hand, it ensures the uniformity of the cold plate itself, avoids local overheating of the cold plate and stress concentration caused by temperature gradients, and effectively extends the service life of the cold plate. On the other hand, by cooperating with the first heat conducting plate, it achieves uniform heat release from the battery cells, ensuring the heat dissipation effect of the battery cells while extending the service life of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the dust collecting cold plate according to an embodiment of the present invention.

[0019] Figure 2 This is an exploded view of the dust collecting cold plate according to an embodiment of the present invention.

[0020] Figure 3 for Figure 2 Schematic diagram of the structure from another perspective.

[0021] In all the drawings, the same figure marks represent the same technical features, specifically: 100, cold plate; 101, first contact surface; 102, second contact surface; 110, water inlet; 120, water outlet; 200, first heat conduction plate; 300, second heat conduction plate; 310, second positioning portion; 400, supporting structure; 410, supporting frame; 411, placement groove; 420, cross bar; 430, longitudinal bar; 431, first positioning portion; 440, through hole; 500, sealing structure. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] like Figures 1 to 3 As shown, an integrated cold plate based on phase change heat transfer includes:

[0025] The cold plate 100 includes a first contact surface 101 and a second contact surface 102 arranged opposite to each other;

[0026] The heat conduction assembly includes a first heat conduction plate 200 and a second heat conduction plate 300. The first heat conduction plate 200 is in contact with the first contact surface 101, and the second heat conduction plate 300 is in contact with the second contact surface 102. When heated, the first heat conduction plate 200 can evenly release heat to the first contact surface 101. When heated, the second heat conduction plate 300 can evenly release heat to the second contact surface 102, thereby reducing the temperature difference between the first contact surface 101 and the second contact surface 102. This design effectively reduces the temperature difference between the upper and lower sides of the cold plate 100 during the flow of coolant. On the one hand, it ensures the uniformity of the temperature of the cold plate 100 itself, avoids local overheating and stress concentration caused by temperature gradients on the cold plate 100, and effectively extends the service life of the cold plate 100. On the other hand, by cooperating with the first heat conduction plate 200, it achieves even heat release from the battery cells, ensuring the heat dissipation effect of the battery cells while extending the service life of the battery cells.

[0027] Specifically, if Figure 2 、 Figure 3 As shown, in this embodiment, the integrated cold plate is mainly used to cool the battery cell (not shown in the figure). It includes a first heat conducting plate 200, a cold plate 100, a second heat conducting plate 300, a heating film (not shown in the figure), a support structure 400, and a sealing structure 500 arranged in sequence from top to bottom. The first heat conducting plate 200, the cold plate 100, the second heat conducting plate 300, the heating film, the support structure 400, and the sealing structure 500 are sequentially attached and detachably connected by bolts or rivets. This design greatly improves the convenience of disassembly and maintenance of the integrated cold plate.

[0028] In this embodiment, the cold plate 100 is in the shape of a rectangular plate and has a hollow structure. It includes a first contact surface 101 and a second contact surface 102 arranged in an upper and lower structure, and a water inlet 110 and a water outlet 120 provided on the first contact surface 101. In addition, a plurality of flow channels (not shown in the figure) connected in parallel to each other and connected to the water inlet 110 and the water outlet 120 are provided between the first contact surface 101 and the second contact surface 102. When the coolant flows through the flow channel through the water inlet 110 and the water outlet 120, the heat of the battery cell connected to the cold plate 100 can be taken away, thereby cooling the battery cell.

[0029] Due to the large temperature difference between the water inlet 110 and the water outlet 120 of the cold plate 100, the temperature uniformity of the cold plate 100 itself is poor, thereby affecting the heat dissipation effect of the battery cell. Therefore, in this embodiment, a heat conduction component is provided, which includes a first heat conduction plate 200 and a second heat conduction plate 300 located on the upper and lower sides of the cold plate 100, wherein the first heat conduction plate 200 is in contact with the first contact surface 101. When the integrated cold plate is assembled on the battery cell, the first heat conduction plate 200 is in contact with the battery cell on the side facing away from the first contact surface 101, so that when the battery cell heats up, the first heat conduction plate 200 can quickly absorb the heat of the battery cell and release the heat quickly and evenly to various positions of the first contact surface 101, thereby achieving an efficient and uniform heat dissipation effect. This design not only effectively improves the heat dissipation efficiency of the battery cell, but also avoids the phenomenon of local high temperature in the battery cell, effectively extending the service life of the battery cell.

[0030] In this embodiment, the second heat conducting plate 300 is in contact with the second contact surface 102, and by cooperating with the first heat conducting plate 200, it realizes double-sided temperature treatment of the cold plate 100. When the coolant circulates in the flow channel, the second heat conducting plate 300 can quickly absorb the heat generated by the heat dissipation of the coolant in the flow channel, and quickly and evenly release the heat to various positions of the second contact surface 102, thereby achieving temperature uniformity of the coolant. This design effectively reduces the temperature difference between the upper and lower sides of the cold plate 100, avoids local overheating of the cold plate 100 and stress concentration caused by temperature gradients, and effectively extends the service life of the cold plate 100.

[0031] In this embodiment, the first heat conducting plate 200 and the second heat conducting plate 300 are rectangular and are both made of phase change material. When the first heat conducting plate 200 and the second heat conducting plate 300 are heated to a specified temperature, the strength of the second heat conducting plate 300 is greater than the strength of the first heat conducting plate 200. Specifically, the first heat conducting plate 200 is made of a phase change material such as a hydrogel, ion gel, or organogel, which can quickly absorb or release heat at a specific temperature and change from a solid state to a gel state; the second heat conducting plate 300 is made of a phase change material such as a shape memory alloy, an inorganic salt, a polymer-based material, or a metal alloy, which can quickly absorb or release heat at a specific temperature and change from a solid state to another solid state. This design allows the second heat conducting plate 300 located below the cold plate 100 to maintain good structural stability and thermal conductivity under high temperature conditions, effectively improving the stability of the overall structure.

[0032] To further ensure the structural rigidity of the integrated cold plate, this embodiment also includes a support structure 400. This support structure 400 is located on the side of the second heat conducting plate 300 facing away from the second contact surface 102 and is detachably connected to the second heat conducting plate 300. The design of this support structure 400 not only further increases the overall rigidity of the integrated cold plate, but also improves the ease of assembly and maintenance of the integrated cold plate through its detachable design.

[0033] Preferably, in this embodiment, the support structure 400 is rectangular and extruded from aluminum. It includes a support frame 410 that supports the entire structure. The support frame 410 is detachably connected to the cold plate 100, securely sandwiching the second heat conducting plate 300 therebetween. The size of the support frame 410 is adapted to the size of the cold plate 100. This design ensures the detachability, stability, and reliability of the entire structure.

[0034] In this embodiment, the support frame 410 is provided with a rectangular placement groove 411 for accommodating the second heat conducting plate 300. A first positioning portion 431 is provided within the placement groove 411, and the second heat conducting plate 300 is provided with a second positioning portion 310 that forms a concave-convex fit with the first positioning portion 431. The coordinated design of the placement groove 411, the first positioning portion 431, and the second positioning portion 310 ensures accurate positioning of the second heat conducting plate 300, effectively reducing installation errors and improving the installation accuracy and reliability of the integrated cold plate.

[0035] Preferably, in this embodiment, the first positioning portion 431 is a convex strip, and the second positioning portion 310 is a groove.

[0036] In this embodiment, the support structure 400 further includes a plurality of horizontal bars 420 and vertical bars 430 positioned within the placement slots 411. The horizontal bars 420 and vertical bars 430 are arranged in a cross pattern and form a plurality of rectangular through holes 440 extending through the placement slots 411. This design ensures the rigidity and stability of the support structure 400 while reducing its mass, thereby achieving a lightweight design for the dust collection cold plate 100.

[0037] In this embodiment, the horizontal bar 420 and the vertical bar 430 are in an "X" shape, with the vertical bar 430 protruding above the upper surface of the horizontal bar 420 to form the second positioning portion 310. Compared to a design with a single first positioning portion 431, this design increases the connection area between the support structure 400 and the second heat conducting plate 300, ensuring a secure connection, while also maximizing the use of the vertical bar 430 structure. Furthermore, the "X" shape not only further reduces the overall structural mass but also saves production costs.

[0038] In this embodiment, a heating film (not shown) is further provided between the support structure 400 and the second heat conducting plate 300. One side of the heating film is bonded to the support structure 400, and the other side is bonded to the second heat conducting plate 300. Preferably, the heating film is a PTC heating film. This design enables the heating film to quickly heat the cold plate 100 through the second heat conducting plate 300 when the battery cell needs to be heated, and finally transfers the heat to the battery cell through the first heat conducting plate 200, thereby achieving efficient and uniform heating of the battery cell, further enriching the function of the integrated cold plate.

[0039] This embodiment also includes a sealing structure 500, which is in the form of a rectangular groove and is removably mounted on the side of the support structure 400 facing away from the second heat conducting plate 300. A cavity is formed between the sealing structure 500 and the support structure 400. Furthermore, a thermal insulation layer (not shown) is provided on the side of the sealing structure 500 facing the support structure 400. This design not only encapsulates the second heat conducting plate 300 but also effectively prevents the external environment from affecting the cold plate 100, improving the thermal insulation performance of the overall structure and reducing heat loss.

[0040] Preferably, in this embodiment, the thermal insulation layer is a polyurethane spray coating, which cooperates with the cavity to enable the bottom of the integrated cold plate to achieve the functions of heat insulation and anti-condensation water.

[0041] It should be noted that, in the present utility model, descriptions such as "first", "second", "one", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly defined. The terms "connected", "fixed", etc. should be understood in a broad sense. For example, "fixed" can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0042] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. An integrated cold plate based on phase change heat transfer, characterized in that: include: a cold plate comprising a first contact surface and a second contact surface arranged opposite to each other; A heat-conducting assembly, comprising a first heat-conducting plate and a second heat-conducting plate, wherein the first heat-conducting plate is in contact with the first contact surface, and the second heat-conducting plate is in contact with the second contact surface, wherein after the first heat-conducting plate is heated, it can evenly release heat to the first contact surface, and after the second heat-conducting plate is heated, it can evenly release heat to the second contact surface, and can reduce the temperature difference between the first contact surface and the second contact surface.

2. The integrated cold plate based on phase change heat transfer according to claim 1, characterized in that: The first heat conducting plate and the second heat conducting plate are both made of phase change material, and when the first heat conducting plate and the second heat conducting plate are heated to a specified temperature, the strength of the second heat conducting plate is greater than the strength of the first heat conducting plate.

3. The integrated cold plate based on phase change heat transfer according to claim 1, characterized in that: The integrated cold plate is used to cool the battery core, and when the integrated cold plate is assembled on the battery core, the side of the first heat conducting plate facing away from the first contact surface is in contact with the battery core.

4. The integrated cold plate based on phase change heat transfer according to claim 1, characterized in that: It comprises a supporting structure, which is arranged on the side of the second heat conducting plate away from the second contact surface and is detachably connected to the second heat conducting plate.

5. The integrated cold plate based on phase change heat transfer according to claim 4, characterized in that: The support structure includes a support frame, which is detachably connected to the cold plate, and a size of the support frame is adapted to a size of the cold plate.

6. The integrated cold plate based on phase change heat transfer according to claim 5, characterized in that: The support frame is provided with a placement groove for accommodating the second heat conducting plate, the placement groove is provided with a first positioning portion, and the second heat conducting plate is provided with a second positioning portion that forms a concave-convex fit with the first positioning portion.

7. The integrated cold plate based on phase change heat transfer according to claim 6, characterized in that: The support structure further comprises a plurality of transverse bars and longitudinal bars located in the placement slots. The transverse bars and longitudinal bars are arranged crosswise and form a plurality of through holes penetrating the placement slots.

8. The integrated cold plate based on phase change heat transfer according to claim 7, characterized in that: The horizontal bar and the vertical bar are in a "F" shape, and the vertical bar protrudes toward a direction higher than the upper surface of the horizontal bar to form the second positioning portion.

9. The integrated cold plate based on phase change heat transfer according to claim 4, characterized in that: A heating film is further provided between the support structure and the second heat conducting plate. One side of the heating film is bonded and connected to the support structure, and the other side of the heating film is bonded and connected to the second heat conducting plate.

10. The integrated cold plate based on phase change heat transfer according to claim 4, characterized in that: It comprises a sealing structure, which is detachably arranged on a side of the supporting structure away from the second heat conducting plate, and forms a cavity between the sealing structure and the supporting structure, and an insulation layer is provided on the sealing structure.

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