Heat exchange plate and battery pack

Abstract

The invention discloses a heat exchange plate and a battery pack. The heat exchange plate comprises a plurality of flow channels which are sequentially arranged in the first direction and sequentially connected in series to form a heat exchange channel. The porous materials are arranged on the sides, close to the battery, of the inner walls of the flow channels, first parameters between the corresponding porous materials in the flow channels are gradually increased in the arrangement direction from the first area to the second area of the battery, and the first parameters comprise the porosity # imgabs 0 # and the pore average diameter # imgabs 1 # of the porous materials; wherein the calorific value of the first area is higher than that of the second area.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a heat exchange plate and a battery pack. Background Art

[0002] With the continuous increase in sales and penetration of new energy vehicles, power battery technology has also developed rapidly. To ensure efficient and sustainable battery operation and maintain an ideal state, necessary thermal management methods are required. Liquid-cooled / direct-cooled heat exchangers are widely used in the industry due to their compact structure and high cooling efficiency.

[0003] However, some areas of the battery cells and heat exchanger have high heat transfer efficiency, while others have low efficiency. This can lead to uneven and large temperature differences between different cells in the battery pack, affecting the performance and safety of the entire pack. While some have addressed this issue by designing complex cold plate flow channels, this approach is complex and lacks a unified design paradigm. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention proposes a heat exchange plate that modulates the heat exchange area of ​​the battery pack through a non-uniform porous material, thereby achieving a localized increase in heat exchange capacity, significantly improving the uniformity of the battery pack surface temperature distribution, and simplifying and standardizing the design process.

[0005] The present invention further provides a battery pack.

[0006] According to an embodiment of the first aspect of the present invention, a heat exchange plate comprises: a plurality of flow channels, wherein the plurality of flow channels are sequentially arranged along a first direction and sequentially connected in series to form a heat exchange channel; a porous material, wherein the porous material is provided on a side of the inner wall of the flow channel adjacent to the battery, and along the arrangement direction from the first region to the second region of the battery, a first parameter between the corresponding porous materials in the plurality of flow channels gradually increases, and the first parameter includes the porosity ε and the average pore diameter of the porous material. ; wherein the heat generation of the first area is higher than the heat generation of the second area.

[0007] According to the heat exchange plate of the embodiment of the present invention, the heat exchange area of ​​the battery is adjusted through non-uniform porous materials, thereby achieving a local improvement in heat exchange capacity, greatly improving the uniformity of the temperature distribution on the battery pack surface, and simplifying the design process.

[0008] According to some embodiments of the present invention, along the arrangement direction from the first area to the second area of ​​the battery, the specific surface area between the corresponding porous materials in the plurality of flow channels is gradually become smaller; Wherein, the specific surface area of ​​the porous material is Calculated from the first parameter, .

[0009] According to some embodiments of the present invention, along the arrangement direction from the first area to the second area of ​​the battery, the second parameter between the corresponding porous materials in the plurality of flow channels gradually decreases; The second parameter includes an average thickness H of the porous material.

[0010] According to some embodiments of the present invention, the height of the flow channel is The range of the average thickness H is: 0<H≤ .

[0011] According to some embodiments of the present invention, the average pore diameter The value range is: 50μm< <500μm.

[0012] According to some embodiments of the present invention, the arrangement direction from the first area to the second area is arranged parallel to the first direction, the flow channels at both ends of the heat exchange plate along the first direction are suitable for corresponding to the first area, and the flow channels between the two ends of the heat exchange plate along the first direction are suitable for corresponding to the second area.

[0013] According to some embodiments of the present invention, a straight line passing through the center of the heat exchange plate and perpendicular to the first direction is taken as the center line. From the center line to the direction away from the center line, the first parameter between the corresponding porous materials in the multiple flow channels gradually decreases.

[0014] According to some embodiments of the present invention, the plurality of flow channels are symmetrically arranged about the center line, and the corresponding porous materials in the plurality of flow channels are symmetrically arranged about the center line.

[0015] According to some embodiments of the present invention, the heat exchange plate includes a main board portion, and a plurality of protruding flow channel cavities are provided on the side of the main board portion facing away from the battery. The plurality of flow channel cavities are arranged in sequence along a first direction and extend along a second direction perpendicular to the first direction, and the flow channel cavities are configured as the flow channels.

[0016] According to some embodiments of the present invention, the heat exchange plate is provided with adjacent liquid inlet and liquid outlet in the middle portion of one side along the second direction, the flow channel at one end of the heat exchange plate along the first direction is a liquid inlet flow channel, and one end of the liquid inlet flow channel is bent and extended to communicate with the liquid inlet, and the flow channel at the other end of the heat exchange plate along the first direction is a liquid outlet flow channel, and one end of the liquid outlet flow channel is bent and extended to communicate with the liquid outlet.

[0017] According to some embodiments of the present invention, the porous material is a heat exchange material selected from the group consisting of aluminum alloy, copper alloy, aluminum-based composite material and copper-based composite material.

[0018] A battery pack according to an embodiment of the second aspect of the present invention includes: a battery, wherein the battery includes a plurality of battery cells, the plurality of battery cells are stacked in sequence along a second direction and extend along a first direction perpendicular to the second direction, the end of the battery tab is divided into the first area, and the middle part of the battery is the second area; the heat exchange plate, wherein the heat exchange plate is attached to one end of the battery along the third direction.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which: Figure 1 is a schematic structural diagram of a heat exchange plate from a first perspective according to an embodiment of the present invention; Figure 2 is a structural schematic diagram of a heat exchange plate according to an embodiment of the present invention from a second perspective; Figure 3 yes Figure 2 AA section view in; Figure 4 yes Figure 3 An enlarged schematic diagram of point C in FIG. Figure 5 yes Figure 2 BB cross-sectional view in; Figure 6 yes Figure 5 An enlarged schematic diagram of point D in FIG.

[0021] Reference numerals: 100. Heat exchange plate; 10. Flow channel; 11. Flow channel one; 12. Flow channel two; 13. Flow channel three; 14. Flow channel four; 15. Liquid inlet flow channel; 16. Liquid outlet flow channel; 20. Porous material; 21. Porous material one; 22. Porous material two; 23. Porous material three; 24. Porous material four; 30. Main board; 40. Flow channel cavity; 50. Liquid inlet; 60. Liquid outlet; 200. Battery; 210. Battery cell. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention will be described in detail below.

[0023] Reference below Figures 1-6A heat exchange plate and a battery according to embodiments of the present invention are described.

[0024] like Figures 1-6 As shown, the heat exchange plate 100 includes: a plurality of flow channels 10 and a porous material 20. The plurality of flow channels 10 are arranged in sequence along the first direction and are connected in series to form a heat exchange channel. Figure 1 and Figure 2 Multiple flow channels 10 are arranged in a sequentially spaced arrangement along the first direction and extend along the second direction, allowing the cooling medium to evenly cover the entire surface, ensuring more complete contact between the cooling medium and the battery 200, preventing the formation of hot spots and thereby improving heat dissipation efficiency. Furthermore, multiple flow channels 10 are connected in series to form a heat exchange channel, allowing the cooling medium to flow through each battery cell 210 in sequence. This ensures temperature uniformity throughout the battery 200 and prevents local overheating.

[0025] Furthermore, the porous material 20 is disposed on the side of the inner wall of the flow channel 10 adjacent to the battery 200. With this arrangement, the porous material 20 has a very large specific surface area, which means that within the same volume, they can provide a heat transfer area far exceeding that of a traditional smooth surface, allowing heat to be transferred through more surface areas, thereby improving the overall heat transfer efficiency of the heat exchange plate 100. Furthermore, the complex channel network inside the porous material 20 promotes the turbulent flow of the cooling medium, increases the degree of mixing between the cooling media, helps to break the boundary layer effect, reduces thermal resistance, and accelerates the transfer of heat from the heat source to the cooling medium. Furthermore, there are a large number of tiny pores inside the porous material 20. When the cooling medium passes through these pores, a strong convection effect is generated, further enhancing the heat transfer effect.

[0026] Furthermore, along the arrangement direction from the first area to the second area of ​​the battery 200, the first parameters between the corresponding porous materials 20 in the plurality of flow channels 10 gradually increase, and the first parameters include the porosity ε and the average pore diameter of the porous material 20 The heat generation of the first area is higher than that of the second area.

[0027] Since different areas of the battery 200 generate different amounts of heat, the temperature of different cells 210 in the battery pack 200 will still be uneven. Therefore, along the arrangement direction from the first area with high heat generation to the area with low heat generation of the battery 200, the first parameters of the corresponding porous materials 20 in the multiple flow channels 10, including the porosity ε and the average pore diameter, are adjusted. Gradually increases. In other words, along the arrangement direction from the first area with high heat generation to the second area with low heat generation, it means that within the same volume, the pores of the porous material 20 gradually become larger and the number becomes smaller, so that the surface area inside the porous material 20 gradually decreases. That is, the heat exchange capacity between the corresponding porous materials 20 in different flow channels 10 gradually decreases. With this arrangement, the heat exchange capacity of the heat exchange plate 100 area corresponding to the first area with high heat generation is stronger, and the heat exchange capacity of the heat exchange plate 100 area corresponding to the second area with low heat generation is weaker, so that the heat exchange plate 100 can effectively exchange heat with the areas of the battery 200 with different heat generation, thereby reducing the surface temperature of the battery 200 while better improving the uniformity of the temperature distribution, better avoiding overheating of local areas of the battery 200, increased energy loss, and serious reduction in the life and performance of the battery 200 module. Among them, the heat generation distribution ratio of the battery 200 is determined by the given battery cell 210, and a reasonable non-uniform layout of the porous material 20 is designed according to the actual situation.

[0028] For ease of understanding, the porosity ε of the porous material 20 refers to the ratio of the pore volume to the total volume of the porous material 20, usually expressed as a percentage. The porosity ε can be calculated using the following formula: ε = V1 / V, where V1 is the pore volume and V is the total volume of the porous material 20. The porosity range is 0 < ε < 1. The average pore diameter of the porous material 20 is Describes the average value of pore size, which can be calculated by layered CT scanning or measured by experimental methods such as gas adsorption or mercury intrusion. In addition, the porous material 20 itself also provides a certain heat absorption capacity. Wherein, ρ is the density of the porous material 20, in kg m-3; V is the total volume of the porous material 20, in m3; is the specific heat capacity of the porous material 20, in kJ kg-1 K-1; is the temperature of the porous material 20 after absorbing heat, is the temperature of the porous material 20 before absorbing heat, in K.

[0029] Therefore, the present invention adopts non-uniform porous material 20 to adjust the heat exchange area of ​​battery 200 for areas with different heat generation of battery 200, thereby achieving local improvement of heat exchange capacity, greatly improving the uniformity of surface temperature distribution of battery 200, and simplifying and standardizing the design process.

[0030] Furthermore, in this embodiment, along the arrangement direction from the first region to the second region of the battery 200, the specific surface area α between the corresponding porous materials 20 in the plurality of flow channels 10 gradually decreases; wherein the specific surface area α of the porous material 20 is calculated by the first parameter: .

[0031] Specifically, along the arrangement direction from the first area with high heat generation to the area with low heat generation of the battery 200, the porosity ε and the average pore diameter between the corresponding porous materials 20 in the multiple flow channels 10 are gradually increased, which means that within the same volume, the pores of the porous material 20 gradually become larger and the number becomes smaller, so that the channel network of the porous material 20 is reduced, that is, the specific surface area α of the porous material 20 gradually decreases. In addition, the value of the specific surface area α of the porous material 20 is determined by the porosity ε and the average pore diameter. Calculated, see the calculation formula for details: From the formula, it can be seen that the relationship between the specific surface area α and the porosity ε and the average pore diameter is inversely proportional.

[0032] See Figure 3 and Figure 4 As shown, along the arrangement direction from the first area with high heat generation to the area with low heat generation of the battery 200, the flow channel 11, the flow channel 2 12, the flow channel 3 13, and the flow channel 4 14 are arranged in sequence. In addition, the flow channel 1 11 is provided with a porous material 1 21, the flow channel 2 12 is provided with a porous material 2 22, the flow channel 3 13 is provided with a porous material 3 23, and the flow channel 4 14 is provided with a porous material 4 24. Among them, the specific surface areas of the porous material 1 21, the porous material 2 22, the porous material 3 23, and the porous material 4 24 are respectively , the following conditions are met: The porosity of porous material 1 21, porous material 2 22, porous material 3 23 and porous material 4 24 , average pore diameter The following relative relationships are satisfied respectively: .

[0033] Furthermore, along the arrangement direction from the first area to the second area of ​​the battery 200, the second parameter between the corresponding porous materials 20 in the plurality of flow channels 10 gradually decreases. The second parameter includes the average thickness H of the porous material 20.

[0034] See Figure 3 and Figure 4 As shown, along the arrangement direction from the first area to the second area of ​​the battery 200, the average thickness of the corresponding porous materials 20 within the multiple flow channels 10 gradually decreases. This means that the porous materials 20 gradually become thinner, resulting in a gradual decrease in the volume of the porous materials 20, and thus a gradual weakening of the heat exchange capacity. This arrangement further improves the non-uniformity of the porous materials 20. Different flow channels 10 locations on the heat exchange plate 100 have different porosity, average pore diameter, and average thickness. This is used to increase the specific surface area and heat exchange capacity in areas with higher heat flux density, further improving the uniformity of the surface temperature distribution of the battery 200.

[0035] In this embodiment, the average thicknesses of the porous material 1 21 , the porous material 2 22 , the porous material 3 23 , and the porous material 4 24 respectively satisfy the following conditions: .

[0036] like Figure 5 and Figure 6 As shown, the porous material 20 is processed on the wall side where the flow channel 10 contacts the battery 200. The dimension of the porous material 20 along the third direction is the thickness of the porous material 20. The dimension of the porous material 20 along the third direction may be inconsistent. Therefore, the average thickness can be obtained by using one of the calculation methods of arithmetic average method, weighted average method or integration method according to the actual situation of the porous material 20.

[0037] Furthermore, in this embodiment, the height of the flow channel 10 is The range of the average thickness H is: 0<H≤ In this configuration, the flow channel 10 may be filled with the porous material 20 (H>0) or completely filled with the porous material 20 (H=H0). The heat exchange area of ​​the battery 200 may be adjusted by using porous materials 20 of different average thicknesses according to different heat generation areas of the battery 200.

[0038] Furthermore, in this embodiment, the range of the average pore diameter is: 50 μm < <500μm. With such a configuration, the porous material 20 within this pore size range has good air permeability and permeability, which is conducive to the rapid transmission of the cooling medium. In addition, the porous material 20 within this pore size range also has good mechanical strength. If the pore size of the porous material 20 is too large, it may become a stress concentration point, thereby affecting the overall mechanical properties of the porous material 20. If the pore size of the porous material 20 is too small, it is not conducive to processing and makes it difficult for the cooling medium to pass through, affecting the flow properties of the cooling medium. Moreover, the porous material 20 within this pore size range has a moderate heat absorption capacity, and the thermal conductivity of the air in the pores is low, which helps to insulate heat, but when the pore size is larger, the radiation heat transfer may be enhanced. In addition, the porous material 20 within this pore size range can also be suitable for use as a packaging matrix for phase change materials. The phase change material can be accommodated in the porous material 20 to alleviate its volume change and increase the thermal response speed.

[0039] Furthermore, in this embodiment, the arrangement direction from the first area to the second area is set parallel to the first direction, the flow channels 10 at both ends of the heat exchange plate 100 along the first direction are suitable for corresponding to the first area, and the flow channels 10 between the two ends of the heat exchange plate 100 along the first direction are suitable for corresponding to the second area.

[0040] Specifically, the arrangement direction from the first region to the second region is parallel to the first direction. The flow channels 10 at the two ends of the first direction among the multiple flow channels 10 cover the first region of the battery 200, and the flow channels 10 between the two ends of the multiple flow channels 10 cover the second region of the battery 200. In other words, along the arrangement direction of the flow channels 10 at the two ends of the first direction to the flow channels 10 in the middle, the first parameter of the porous material 20 gradually increases, and the flow channels 10 at the two ends of the first direction have a stronger heat exchange capacity, while the flow channels 10 between the two ends have a weaker heat exchange capacity.

[0041] Furthermore, in this embodiment, a straight line passing through the center of the heat exchange plate 100 and perpendicular to the first direction is taken as the center line. From the center line to the direction away from the center line, the first parameter between the corresponding porous materials 20 in the multiple flow channels 10 gradually decreases.

[0042] See Figure 2-Figure 4 As shown, a straight line passing through the center of the heat exchange plate 100 and perpendicular to the first direction is the center line L. From the center line L in a direction away from the center line L, that is, in the arrangement direction from the second region of the battery 200 with low heat generation to the first region of the battery 200 with high heat generation, the first parameters between the corresponding porous materials 20 in the multiple flow channels 10 gradually decrease, allowing the heat exchange plate 100 to effectively exchange heat in the regions of the battery 200 with different heat generation, thereby further improving the uniformity of temperature distribution.

[0043] Furthermore, in this embodiment, the multiple flow channels 10 are symmetrically arranged about the centerline, and the corresponding porous materials 20 within the multiple flow channels 10 are symmetrically arranged about the centerline. Specifically, the multiple flow channels 10 on one side of the centerline are symmetrically arranged with the multiple flow channels 10 on the other side of the centerline, and the multiple porous materials 20 on one side of the centerline are symmetrically arranged with the multiple porous materials 20 on the other side of the centerline. This facilitates manufacturing and allows for uniform coverage of the surface of the battery 200, achieving effective heat dissipation in different areas of the battery 200.

[0044] Furthermore, in this embodiment, the heat exchange plate 100 includes a main plate portion 30, and a plurality of protruding flow channel cavities 40 are provided on the side of the main plate portion 30 facing away from the battery 200. The plurality of flow channel cavities 40 are arranged in sequence along a first direction and extend along a second direction perpendicular to the first direction. The flow channel cavities 40 are configured to form flow channels 10. Figure 4 As shown, the side of the main board portion 30 close to the battery 200 is attached to the surface of the battery 200, and the side of the main board portion 30 away from the battery 200 is provided with multiple protruding flow channel cavities 40, which are not only conducive to the flow of cooling medium, but also conducive to the dissipation of heat from the surface of the flow channel cavity 40.

[0045] Optionally, the main plate portion 30 and the flow channel cavity 40 are an integrally formed part and can be made of aluminum material.

[0046] Optionally, the cross section of the flow channel cavity 40 is substantially rectangular.

[0047] Optionally, the porous material 20 can be prepared by sintering, molding, printing, etc.

[0048] Optionally, the cooling medium may be a liquid working medium or a phase-change working medium.

[0049] Furthermore, in this embodiment, the heat exchange plate 100 is provided with adjacent liquid inlet 50 and liquid outlet 60 in the middle portion of one side along the second direction. The flow channel 10 at one end of the heat exchange plate 100 along the first direction is a liquid inlet channel 15, and one end of the liquid inlet channel 15 bends and extends to communicate with the liquid inlet 50. The flow channel 10 at the other end of the heat exchange plate 100 along the first direction is a liquid outlet channel 16, and one end of the liquid outlet channel 16 bends and extends to communicate with the liquid outlet 60. With this arrangement, the cooling medium flows into the liquid inlet through the liquid inlet 50, flows sequentially through the flow channel 10 between the liquid inlet channel 15 and the liquid outlet channel 16, and then flows into the liquid outlet 60, thereby removing heat from the battery 200.

[0050] Furthermore, in this embodiment, the porous material 20 is a heat exchange material selected from the group consisting of aluminum alloy, copper alloy, aluminum-based composite material, and copper-based composite material. This configuration effectively improves heat exchange efficiency by making the porous material 20 from aluminum alloy, copper alloy, aluminum-based composite material, and copper-based composite material into a porous material 20, due to their high thermal conductivity.

[0051] A battery pack 200 according to an embodiment of the second aspect of the present invention includes: a battery 200, wherein the battery 200 includes a plurality of battery cells 210, the plurality of battery cells 210 are arranged along a second direction and extend along a first direction perpendicular to the second direction, the tab end of the battery 200 is divided into a first area, and the middle part of the battery 200 is a second area; and a heat exchange plate 100, wherein the heat exchange plate 100 is attached to one end of the battery 200 along a third direction.

[0052] Specifically, the positive and negative ends of the battery 200 are regions with a high heat flux density, i.e., the first region. The middle portion of the battery 200 between the two ends is a region with a relatively low heat flux density, i.e., the second region. The heat flux density of the battery 200 gradually decreases from the first region to the second region. Optionally, the battery 200 may be a blade battery 200.

[0053] Therefore, in view of the fact that there are areas of different heat generation in the battery 200, the present invention proposes to fill the wall side of the flow channel 10 of the heat exchange plate 100 in contact with the battery cell 210 with non-uniformly distributed porous materials 20 to adapt to the non-uniform heat generation distribution characteristics. The non-uniform distribution of the porous material 20 is reflected in the non-uniform distribution of the average thickness, porosity and average pore diameter of the porous material 20. The present invention provides the arrangement of the flow channel 10 compared to the battery 200, as well as the relative relationship and boundary range of the structural parameters of the porous material 20 at different flow channels 10. While further reducing the temperature of the battery 200, it improves the uniformity of the temperature distribution, helps to weaken the concentration of thermal stress, and improves the overall structural performance of the system.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0056] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A heat exchange plate, characterized in that: include: A plurality of flow channels, wherein the plurality of flow channels are sequentially arranged along a first direction and sequentially connected in series to form a heat exchange channel; A porous material is provided on the side of the inner wall of the flow channel adjacent to the battery. Along the arrangement direction from the first area to the second area of ​​the battery, the first parameter between the corresponding porous materials in the plurality of flow channels gradually increases. The first parameter includes the porosity of the porous material. and the average pore diameter ; The heat generated by the first region is higher than the heat generated by the second region.

2. The heat exchange plate according to claim 1, characterized in that The specific surface area between the corresponding porous materials in the plurality of flow channels along the arrangement direction from the first area to the second area of ​​the battery gradually become smaller; Wherein, the specific surface area of ​​the porous material is Calculated from the first parameter, .

3. The heat exchange plate according to claim 1, characterized in that Along the arrangement direction from the first area to the second area of ​​the battery, the second parameter between the corresponding porous materials in the plurality of flow channels gradually decreases; The second parameter includes an average thickness H of the porous material.

4. The heat exchange plate according to claim 3, characterized in that The height of the flow channel is The range of the average thickness H is: 0<H≤ .

5. The heat exchange plate according to claim 1, characterized in that: The average pore diameter The value range is: 50μm< <500μm.

6. The heat exchange plate according to claim 1, characterized in that The arrangement direction from the first area to the second area is arranged parallel to the first direction, the flow channels at both ends of the heat exchange plate along the first direction are suitable for corresponding to the first area, and the flow channels between the two ends of the heat exchange plate along the first direction are suitable for corresponding to the second area.

7. The heat exchange plate according to claim 6, characterized in that A straight line passing through the center of the heat exchange plate and perpendicular to the first direction is taken as a center line. From the center line to a direction away from the center line, the first parameter between the corresponding porous materials in the plurality of flow channels gradually decreases.

8. The heat exchange plate according to claim 7, characterized in that: The plurality of flow channels are symmetrically arranged about the center line, and the corresponding porous materials in the plurality of flow channels are symmetrically arranged about the center line.

9. The heat exchange plate according to claim 1, characterized in that The heat exchange plate includes a main board portion, and a plurality of protruding flow channel cavities are provided on a side of the main board portion facing away from the battery. The plurality of flow channel cavities are arranged in sequence along a first direction and extend along a second direction perpendicular to the first direction. The flow channel cavities are configured as the flow channels.

10. The heat exchange plate according to claim 9, characterized in that: The heat exchange plate is provided with an adjacent liquid inlet and liquid outlet in the middle of one side along the second direction, the flow channel at one end of the heat exchange plate along the first direction is a liquid inlet flow channel, and one end of the liquid inlet flow channel is bent and extended to communicate with the liquid inlet, and the flow channel at the other end of the heat exchange plate along the first direction is a liquid outlet flow channel, and one end of the liquid outlet flow channel is bent and extended to communicate with the liquid outlet.

11. The heat exchange plate according to claim 1, characterized in that The porous material is a heat exchange material selected from aluminum alloy, copper alloy, aluminum-based composite material and copper-based composite material.

12. A battery pack, characterized in that: include: A battery, the battery comprising a plurality of battery cells, the plurality of battery cells being stacked sequentially along a second direction and extending along a first direction perpendicular to the second direction, the end portion of the battery tab being defined as the first region, and the middle portion of the battery being defined as the second region; The heat exchange plate according to any one of claims 1 to 11, wherein the heat exchange plate is attached to one end of the battery along the third direction.

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