Liquid cooling system and battery pack

Abstract

The invention provides a liquid cooling system and a battery pack. The liquid cooling system comprises a liquid cooling plate and a liquid cooling pipe, a cavity is formed in the liquid cooling plate, a first liquid absorption core, a plurality of supporting columns and a working medium are arranged in the cavity, and the working medium is a phase change material; the liquid cooling pipe is arranged on one side of the liquid cooling plate, and the orthographic projection of the liquid cooling pipe on the liquid cooling plate is located in the area of the first inner wall. According to the liquid cooling plate, the cavity is formed in the liquid cooling plate, the first liquid absorption core, the supporting column and the working medium are arranged in the cavity, the working medium is a phase change material, the working medium absorbs heat of the first inner wall and then is converted into a gas state from a liquid state, and the gas-state working medium is condensed on the second inner wall and then flows back to the first inner wall along the surface of the supporting column; through circulation of evaporation and condensation of a working medium, heat is transferred from one side of the first inner wall to one side of the second inner wall, the liquid cooling pipe is arranged on one side of the second inner wall, the heat can be taken away, and therefore the technical problems that the temperature rise of a heat source is too high and temperature distribution is uneven are solved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid cooling system and a battery pack. Background Art

[0002] In the related technology, the liquid cooling system is usually made of aluminum metal plates, and a pipe is formed inside the aluminum metal plate. The coolant flows through the pipe. The heat generated by the heat source, such as the heat generated by the battery during operation, can be transferred to the liquid cooling pipe through the aluminum metal plate, thereby achieving heat dissipation of the heat source. The thermal conductivity of aluminum metal material is low. When the battery is in use, the heat transfer of the aluminum metal plate is limited, which will cause the battery temperature to rise too high and the temperature distribution to be uneven.

[0003] Therefore, it is urgent to solve the above technical problems. Summary of the invention

[0004] The embodiments of the present application provide a liquid cooling system and a battery pack, which can improve the technical problems of excessive temperature rise and uneven temperature distribution of the heat source.

[0005] In a first aspect, an embodiment of the present application provides a liquid cooling system, the liquid cooling system comprising:

[0006] A liquid cooling plate, wherein a cavity is provided inside the liquid cooling plate, a first liquid wick, a plurality of support columns and a working medium are provided in the cavity, the cavity is provided with a first inner wall and a second inner wall opposite to each other, the first liquid wick is provided on the first inner wall, a plurality of support columns are provided between the second inner wall and the first liquid wick, and the working medium is a phase change material;

[0007] A liquid cooling pipe is arranged on one side of the liquid cooling plate, and an orthographic projection of the liquid cooling pipe on the liquid cooling plate is located within the area of ​​the first inner wall.

[0008] In one embodiment, a plurality of protrusion structures are provided on one side surface of the liquid cooling plate, and a continuous channel is provided on the surface of the protrusion structure; the liquid cooling tube is embedded in the channel, and the surface of the channel is in contact with the outer wall of the liquid cooling tube.

[0009] In one embodiment, a second absorbent core is disposed in the cavity, the second absorbent core is disposed on the second inner wall, a side surface of the support column close to the first absorbent core abuts against the first absorbent core, and a side surface of the support column close to the second absorbent core abuts against the second absorbent core.

[0010] In one embodiment, a distance between two adjacent support pillars in a middle region of the cavity is less than or equal to a distance between two adjacent support pillars in an edge region of the cavity.

[0011] In one embodiment, a central angle of an arc length of a portion of the continuous arc surface of the liquid cooling tube is 60 degrees to 150 degrees, and a central angle of an arc length of another portion of the continuous arc surface is 120 degrees to 180 degrees.

[0012] In one embodiment, the liquid cooling tube includes a plurality of straight tubes arranged at intervals and a U-shaped tube connecting ends of two adjacent straight tubes, and the straight tube and the U-shaped tube are integrally arranged.

[0013] In one embodiment, a distance between two adjacent straight tubes located in a middle area of ​​the liquid cooling plate is smaller than a distance between two adjacent straight tubes located in an edge area of ​​the liquid cooling plate.

[0014] In one embodiment, the support column is a plate-like structure, and the extension direction of the long side of the plate-like structure is arranged parallel to the axial direction of the straight tube.

[0015] In one embodiment, the liquid cooling tube is a circular tube, the surface of the channel is an arc surface arranged concentrically with the circular tube, and the central angle of the arc length of the arc surface is greater than or equal to 60 degrees and less than or equal to 180 degrees.

[0016] In a second aspect, an embodiment of the present application provides a battery pack, which includes the above-mentioned liquid cooling system and a plurality of batteries, wherein the plurality of batteries are arranged on a side of the liquid cooling plate away from the liquid cooling tube.

[0017] Beneficial effects of the embodiments of the present application:

[0018] In an embodiment of the present application, a cavity is provided in the liquid cooling plate, and a first liquid absorption core, a support column and a working fluid are provided in the cavity. The working fluid is a phase change material. After the working fluid absorbs the heat from the first inner wall, it is converted from liquid to gas. The gaseous working fluid condenses on the second inner wall and then flows back to the first inner wall along the surface of the support column. Through the cycle of evaporation and condensation of the working fluid, the heat is transferred from one side of the first inner wall to the other side of the second inner wall. A liquid cooling pipe is provided on one side of the second inner wall to take away the heat, thereby improving the technical problems of excessive temperature rise and uneven temperature distribution of the heat source. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a three-dimensional structural schematic diagram of a liquid cooling system provided in an embodiment of the present application from one perspective;

[0021] Figure 2 yes Figure 1 A three-dimensional structural diagram of a liquid cooling system from another perspective;

[0022] Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at CC in FIG.

[0023] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at A in FIG.

[0024] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at B in FIG.

[0025] Figure 6 is a schematic diagram of a three-dimensional structure of a battery pack provided in an embodiment of the present application;

[0026] Figure 7 yes Figure 6 Schematic diagram of the disassembled structure of the battery pack.

[0027] Description of reference numerals:

[0028] Liquid cooling system 1;

[0029] Liquid cooling plate 10, first liquid wick 11, support column 12, first inner wall 13, second inner wall 14, second liquid wick 15, protruding structure 16, channel 17, first sub-plate 130, second sub-plate 140;

[0030] Liquid cooling tube 20, straight tube 21, U-shaped tube 22;

[0031] The distance L between two adjacent support columns 12, the distance L1 between two adjacent support columns 12 in the middle area, and the distance L2 between two adjacent support columns 12 in the edge area;

[0032] The distance S between two adjacent straight tubes 21, the distance S1 between two adjacent straight tubes 21 in the middle area, and the distance S2 between two adjacent straight tubes 21 in the edge area;

[0033] Battery pack 2, battery 3, shell 4, box cover 5. DETAILED DESCRIPTION

[0034] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application. The embodiments described herein with reference to the drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0035] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Furthermore, "fixed" in this article should also be understood in a broad sense. For example, "fixed" can be a direct fixation or an indirect fixation through an intermediate medium. Among them, "fixed connection" means that the relative position relationship after connection remains unchanged. "Rotational connection" means that the connection is made to each other and can rotate relative to each other after connection. "Sliding connection" means that the connection is made to each other and can slide relative to each other after connection. The directional terms mentioned in the embodiments of the present application, such as "up", "down", "left", "right", "inside", "outside", etc., are only reference directions of the drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, 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 cannot be understood as a limitation on the embodiments of the present application.

[0036] In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", "third", and "fourth" may explicitly or implicitly include one or more of the features.

[0037] In the embodiments of the present application, the term "plurality" refers to two or more than two. In addition, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0038] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0039] It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings.

[0040] First, as Figures 1 to 5 As shown, an embodiment of the present application provides a liquid cooling system 1. Figure 1 The figure mainly shows the surface of the liquid cooling system 1 facing the heat source. Figure 2 The surface of the liquid cooling system 1 that is away from the heat source is mainly shown. Figure 3 yes Figure 1 Schematic diagram of the cross-sectional structure at CC in FIG. Figure 4 yes Figure 3 The enlarged structural diagram of A in FIG. Figure 5 yes Figure 4 Schematic diagram of the enlarged structure at B in FIG.

[0041] The liquid cooling system 1 includes a liquid cooling plate 10 and a liquid cooling tube 20. A cavity is provided inside the liquid cooling plate 10, in which a first liquid absorption core 11, a plurality of support columns 12 and a working medium (not shown in the figure) are provided. The cavity is provided with a first inner wall 13 and a second inner wall 14 opposite to each other. The first liquid absorption core 11 is arranged on the first inner wall 13, and a plurality of support columns 12 are arranged between the second inner wall 14 and the first liquid absorption core 11. The working medium is a phase change material. The liquid cooling tube 20 is arranged on one side of the liquid cooling plate 10, and the orthographic projection of the liquid cooling tube 20 on the liquid cooling plate 10 is located in the area of ​​the first inner wall 13.

[0042] Optionally, the liquid cooling plate 10 may be made of metal material, such as aluminum, copper, etc., but is not limited thereto.

[0043] Optionally, the liquid cooling tube 20 may be made of metal material, such as aluminum, copper, etc., but is not limited thereto.

[0044] Alternatively, if Figures 3 to 5 As shown, the liquid cooling plate 10 may be a heat spreader. A cavity is provided inside the liquid cooling plate 10, and the cavity may be a vacuum cavity. Specifically, the liquid cooling plate 10 may include a first sub-plate 130 and a second sub-plate 140 opposite to each other, and the edges of the first sub-plate 130 and the second sub-plate 140 are connected to form a cavity. The edges of the first sub-plate 130 and the second sub-plate 140 may be connected by welding. The materials of the first sub-plate 130 and the second sub-plate 140 may be the same or different.

[0045] like Figure 5 As shown, the cavity is provided with a first inner wall 13 and a second inner wall 14 opposite to each other. The first inner wall 13 may be a side surface of the first sub-board 130 close to the second sub-board 140 , and the second inner wall 14 may be a side surface of the second sub-board 140 close to the first sub-board 130 .

[0046] Optionally, the second inner wall 14 is located on a side of the first inner wall 13 close to the liquid cooling tube 20 .

[0047] The first absorbent core 11 has a capillary structure (not shown in the figure), and the capillary can accommodate the working medium. The first absorbent core 11 can be a metal wire mesh, a sintered metal powder, etc. When the first absorbent core 11 is a sintered metal powder, the first absorbent core 11 can be sintered and fixed on the first inner wall 13.

[0048] The working fluid can be a phase change material, such as deionized water, alcohol or acetone, etc., which has a large latent heat of phase change. The working fluid is arranged in the cavity, wherein part of the working fluid can be stored in the capillary pores of the first liquid wick 11, and part of the working fluid can be stored in the gap between two adjacent support columns 12.

[0049] Alternatively, if Figure 5 As shown, the support column 12 is disposed in the cavity. The support column 12 can be integrally formed with one of the first sub-board 130 or the second sub-board 140 , or the support column 12 can be independently disposed.

[0050] Optionally, the support column 12 is a columnar structure or a plate-like structure. The axial direction of the columnar structure is perpendicular to the first inner wall 13. The extension direction of the plate-like structure is parallel to the first inner wall 13.

[0051] Optionally, the first liquid absorbent core 11 is disposed on the first inner wall 13 , and one end of the support column 12 may abut against the first liquid absorbent core 11 , and the other end may abut against the second inner wall 14 .

[0052] Optionally, the first liquid absorbent core 11 is disposed on the second inner wall 14 , one end of the support column 12 abuts against the first liquid absorbent core 11 , and the other end abuts against the first inner wall 13 .

[0053] Alternatively, if Figures 2 to 4 As shown, the liquid cooling pipe 20 is arranged on one side of the liquid cooling plate 10. A flowing coolant may be arranged in the liquid cooling pipe 20. The coolant takes away the heat of the liquid cooling plate 10, thereby cooling the liquid cooling plate 10 and preventing the liquid cooling plate 10 from over-temperature rise.

[0054] The liquid cooling plate 10 is a plate-like structure having at least six surfaces, wherein the surface areas of two opposing surfaces are larger than the surface areas of any other surfaces, and the two surfaces with the largest surface areas of the liquid cooling plate 10 are referred to as large end surfaces of the liquid cooling plate 10. The large end surface on one side of the liquid cooling plate 10 is arranged corresponding to the heat source, and the large end surface on the other side is arranged corresponding to the liquid cooling tube 20.

[0055] See also Figure 5The first inner wall 13 of the liquid cooling plate 10 is close to the heat source, and the working fluid evaporates after absorbing heat, and is converted from liquid to gas. The gaseous working fluid condenses on the second inner wall 14 of the liquid cooling plate 10, is converted into liquid, and flows back to the first inner wall 13 along the support column 12. Through the cycle of evaporation and condensation of the working fluid, the liquid cooling plate 10 can continuously transfer the heat of the first inner wall 13 to the second inner wall 14. The heat of the second inner wall 14 is then transferred to the liquid cooling tube 20 and is taken away by the coolant in the liquid cooling tube 20, thereby achieving uniform temperature of the heat source. Due to the use of the evaporation and condensation cycle of the working fluid to absorb heat, the thermal conductivity of the liquid cooling plate 10 is higher than that of ordinary metal materials, which can better improve the problems of excessive temperature rise and uneven temperature distribution of the heat source.

[0056] Alternatively, if Figure 2 and Figure 3 As shown, in order to allow the heat in the area corresponding to the first inner wall 13 to be taken away by the coolant in the liquid cooling pipe 20 , the liquid cooling pipe 20 can be arranged corresponding to the area of ​​the first inner wall 13 .

[0057] For the convenience of description, the cavity of the liquid cooling plate 10 and the structure in the cavity are referred to as a heat-dissipating structure. The heat-dissipating structure uses the evaporation-condensation cycle of the working fluid to absorb heat and has a high thermal conductivity.

[0058] Optionally, the liquid cooling tube 20 may also adopt a heat equalizing structure, that is, the liquid cooling tube 20 is set as a heat equalizing tube. Specifically, a cavity coaxially arranged with the tube wall of the liquid cooling tube 20 is set in the tube wall of the heat equalizing tube, and a liquid wick is set in the cavity along the thickness direction of the tube wall, and the cavity is filled with a working medium. The setting of the liquid wick can be similar to the setting of the first liquid wick 11, and will not be repeated here.

[0059] The working medium can be evaporated and condensed in a cycle along the extension direction of the pipe in the liquid cooling pipe 20. By setting the liquid cooling pipe 20 as a heat-averaging pipe, the thermal conductivity of the liquid cooling pipe 20 can be further improved.

[0060] In one embodiment, if Figures 2 to 4 As shown, a plurality of protrusion structures 16 are provided on one side surface of the liquid cooling plate 10 , and a continuous channel 17 is provided on the surface of the protrusion structure 16 ; the liquid cooling tube 20 is embedded in the channel 17 , and the surface of the channel 17 is in contact with the outer wall of the liquid cooling tube 20 .

[0061] The shape of the channel 17 may match the shape of the outer surface of the liquid cooling plate 10 , thereby increasing the contact area between the liquid cooling plate 10 and the liquid cooling tube 20 and improving the heat exchange efficiency between the liquid cooling plate 10 and the liquid cooling tube 20 .

[0062] In one embodiment, if Figure 4 As shown, the liquid cooling tube 20 is a circular tube, and the surface of the channel 17 is an arc surface arranged concentrically with the circular tube, and the central angle of the arc length of the arc surface is greater than or equal to 60 degrees and less than or equal to 180 degrees.

[0063] When the central angle corresponding to the arc length of the arc surface is greater than 180 degrees, it is difficult for the support tube to be inserted into the channel 17. By setting the central angle of the arc length of the arc surface to be less than or equal to 180 degrees, the channel 17 and the liquid cooling tube 20 can be formed separately, and then the liquid cooling tube 20 can be assembled into the channel 17, thereby reducing the difficulty of processing and assembly.

[0064] When the central angle of the arc length of the arc surface is less than 60 degrees, the contact area between the channel 17 and the liquid cooling tube 20 is small, and heat transfer is not easy.

[0065] like Figure 4 As shown, Figure 4 The case where the central angle of the arc length of the arc surface is equal to 180 degrees is shown.

[0066] In one embodiment, the center angle of the arc length of a portion of the continuous arc surface of the liquid cooling tube 20 is 60 degrees to 150 degrees, and the center angle of the arc length of another portion of the continuous arc surface is 120 degrees to 180 degrees. The coolant in the liquid cooling tube 20 is injected from the liquid inlet and flows out from the liquid outlet. The temperature rise near the liquid outlet of the liquid cooling tube 20 is higher, therefore, the center angle of the arc length of a portion of the continuous arc surface near the liquid outlet of the liquid cooling tube 20 is set to be larger, which makes it easier to reduce the temperature rise. The temperature rise near the liquid outlet of the liquid cooling tube 20 is lower, therefore, the center angle of the arc length of a portion of the continuous arc surface near the liquid inlet of the liquid cooling tube 20 can be set to be smaller.

[0067] For ease of description, the length of the path for the coolant to flow in the liquid cooling tube 20 is defined as L, and the center angle of the arc length of the arc surface corresponding to the L / 2 path near the liquid outlet in the liquid cooling tube 20 is set to be larger, and the center angle of the arc length of the arc surface corresponding to the other L / 2 path near the liquid inlet is set to be smaller. The path lengths of the coolant corresponding to the two different arc surfaces can also be allocated according to other proportions, not just limited to 1 / 2, and this application does not limit this.

[0068] In one embodiment, if Figure 5 As shown, a second absorbent core 15 is disposed in the cavity, and the second absorbent core 15 is disposed on the second inner wall 14 . A surface of the support column 12 close to the first absorbent core 11 abuts against the first absorbent core 11 , and a surface of the support column 12 close to the second absorbent core 15 abuts against the second absorbent core 15 .

[0069] Optionally, the configuration of the second absorbent core 15 may be similar to that of the first absorbent core 11 , which will not be repeated here.

[0070] The second absorbent core 15 has capillaries inside, and the working fluid can be stored in the capillaries inside the second absorbent core 15. Since the end of the support column 12 close to the second absorbent core 15 is in contact with the second absorbent core 15, when the working fluid condenses into liquid on the second inner wall 14, the liquid working fluid can flow back to the first inner wall 13 along the surface of the support column 12 under the capillary action. The end of the support column 12 away from the second absorbent core 15 is in contact with the first absorbent core 11, and the liquid working fluid can enter the capillary pores in the first absorbent core 11 under the capillary action to carry out the next evaporation and condensation cycle. By making the support column 12 abut against the first absorbent core 11, the circulation efficiency of the working fluid can be accelerated, and efficient heat transfer and temperature uniformity can be achieved.

[0071] In one embodiment, the distance L1 between two adjacent support pillars 12 in the middle area of ​​the cavity is less than or equal to the distance L2 between two adjacent support pillars 12 in the edge area of ​​the cavity.

[0072] like Figure 5 As shown, the distance L between two adjacent support pillars 12 is the minimum distance between the surfaces of two adjacent support pillars 12 that are close to each other. For ease of description, the distance between two adjacent support pillars 12 in the middle area is defined as L1, and the distance between two adjacent support pillars 12 in the edge area of ​​the cavity is defined as L2, L1≤L2.

[0073] The middle area of ​​the cavity is the area corresponding to the geometric center of the cavity, and the edge area of ​​the cavity is the area excluding the middle area. When the density of the support column 12 is higher, the distance L between two adjacent support columns 12 is smaller. When the density of the support column 12 is higher, it has a better thermal conductivity. Since the heat source is arranged on one side of the liquid cooling plate 10, the heat in the middle area of ​​the cavity is less likely to dissipate than the heat in the edge area of ​​the cavity, and the temperature rise in the middle area of ​​the cavity is higher during use. By setting the spacing L1 of the support columns 12 in the middle area of ​​the cavity to be smaller than the spacing L2 of the support columns 12 in the edge area of ​​the cavity, the heat dissipation in the middle area of ​​the cavity can be made faster than the heat dissipation in the edge area of ​​the cavity, thereby making the temperature distribution of the liquid cooling plate 10 uniform.

[0074] Optionally, the support column 12 may be a columnar structure. When the support column 12 is a columnar structure, the edge region of the cavity may be arranged around the middle region of the cavity, that is, the edge region of the cavity surrounds the middle region of the cavity.

[0075] Optionally, the support column 12 may be a plate-like structure. The support column 12 being a plate-like structure means that the support column 12 is similar to a support wall, and compared with a columnar structure, the plate-like structure has a larger contact area with the first inner wall 13 and the second inner wall 14, which can further improve the mechanical strength of the liquid cooling plate 10. The long side of the plate-like structure refers to the side in the extension direction of the plate-like structure.

[0076] When the support column 12 is a plate-like structure, the middle area and the edge area can be arranged in a direction perpendicular to the long side of the plate-like structure, and the edge area is located on both sides of the middle area. Figure 5 As shown, the middle area and the edge area can be arranged in a horizontal direction.

[0077] In one embodiment, nanopores are provided in the support column 12. By providing nanopores in the support column 12, the support column 12 can have a capillary effect, so that the working fluid can flow back along the nanopores of the support column 12 under the capillary effect, thereby improving the heat dissipation effect of the heat spreader.

[0078] In one embodiment, if Figure 2 As shown, the liquid cooling tube 20 includes a plurality of straight tubes 21 arranged at intervals and a U-shaped tube 22 connecting the ends of two adjacent straight tubes 21 , and the straight tube 21 and the U-shaped tube 22 are integrally arranged.

[0079] The central axis of the straight tube 21 extends in a straight direction. The central axis of the U-shaped tube 22 extends in a U shape. One end of the U-shaped tube 22 is connected to the end of a straight tube 21 close to the U-shaped tube 22, and the other end is connected to the end of another straight tube 21 close to the U-shaped tube 22. The U-shaped tube 22 is connected to the adjacent straight tubes 21 to form a continuous pipeline.

[0080] Alternatively, if Figure 2 As shown, both ends of the channel 17 extend to the edge of the liquid cooling plate 10, and the liquid cooling pipe 20 includes an inlet and an outlet, which are respectively arranged corresponding to one of the two ends of the channel 17, and the inlet and the outlet extend beyond the edge of the liquid cooling plate 10. The inlet is used for the inlet of the cooling liquid, and the outlet is used for the return of the cooling liquid.

[0081] In one embodiment, if Figure 4 As shown, the distance S1 between two adjacent straight tubes 21 located in the middle area of ​​the liquid cooling plate 10 is smaller than the distance S2 between two adjacent straight tubes 21 located in the edge area of ​​the liquid cooling plate 10 .

[0082] like Figure 4 As shown, the spacing S between two adjacent straight tubes 21 is the minimum spacing between the surfaces of the two adjacent straight tubes 21. For ease of description, the spacing between two adjacent straight tubes 21 in the middle area is defined as S1, and the spacing between two adjacent straight tubes 21 in the edge area of ​​the cavity is defined as S2, S1≤S2.

[0083] Since the heat in the middle area of ​​the liquid cooling plate 10 is easier to concentrate than the heat in the edge area of ​​the liquid cooling plate 10, the heat dissipation effect of the middle area of ​​the liquid cooling plate 10 can be improved by reducing the distance S1 between two adjacent straight tubes 21 in the middle area, thereby preventing the temperature in the middle area of ​​the liquid cooling plate 10 from rising too high.

[0084] In one embodiment, if Figure 4 As shown, the support column 12 is a plate-like structure, and the extension direction of the long side of the plate-like structure is arranged parallel to the axial direction of the straight tube 21. Through the above arrangement, the distribution of the support columns 12 can correspond to the distribution of the liquid cooling tube 20. After the working fluid evaporates, it is located between two adjacent support columns 12, and the heat of the working fluid can be taken away by the liquid cooling tube 20 arranged in the same direction, thereby improving the heat exchange efficiency between the working fluid and the liquid cooling tube 20, and further improving the uneven temperature distribution of the heat source.

[0085] Second, as Figure 6 and Figure 7 As shown, an embodiment of the present application provides a battery pack 2. Among them, Figure 6 The three-dimensional structure diagram of the battery box is shown in FIG. Figure 7 for Figure 6 The battery pack 2 includes the above-mentioned liquid cooling system 1 and a plurality of batteries 3, and the plurality of batteries 3 are arranged on a side of the liquid cooling plate 10 away from the liquid cooling tube 20.

[0086] Multiple batteries 3 can be arranged along the large end surface of the liquid cooling plate 10, and the same side surface of the multiple batteries 3 can be in contact with the side surface of the liquid cooling plate 10 facing away from the liquid cooling plate 10. The heat generated by the battery 3 during use can be transferred to the side surface of the liquid cooling plate 10 close to the battery 3, and transferred to the liquid cooling tube 20 on the other side of the liquid cooling plate 10 through evaporation and condensation of the working fluid inside the liquid cooling plate 10.

[0087] like Figure 6 and Figure 7 As shown, the battery pack 2 may include a shell 4 and a box cover 5, the shell 4 includes a bottom plate and a plurality of side plates connected to the bottom plate, the bottom plate and the side plates form a receiving cavity for receiving the liquid cooling tube 20. The shell 4 may protect the liquid cooling tube 20 to prevent the liquid cooling tube 20 from being damaged by collision. The box cover 5 may cooperate with the shell 4 to form a box body, and the battery 3 is arranged in the space inside the box body.

[0088] Since the liquid cooling system 1 has a high thermal conductivity, the heat of the battery 3 can be quickly dissipated, thereby reducing the temperature rise of the battery pack 2 in high-power application scenarios and extending the life of the battery pack 2.

[0089] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A liquid cooling system (1), characterized in that: include: A liquid cooling plate (10), wherein a cavity is provided inside the liquid cooling plate (10), a first liquid wick (11), a plurality of support columns (12) and a working medium are provided in the cavity, the cavity is provided with a first inner wall (13) and a second inner wall (14) opposite to each other, the first liquid wick (11) is provided on the first inner wall (13), the plurality of support columns (12) are provided between the second inner wall (14) and the first liquid wick (11), and the working medium is a phase change material; A liquid cooling pipe (20) is arranged on one side of the liquid cooling plate (10), and an orthographic projection of the liquid cooling pipe (20) on the liquid cooling plate (10) is located within the area of ​​the first inner wall (13).

2. The liquid cooling system (1) according to claim 1, characterized in that: A second absorbent core (15) is arranged in the cavity, and the second absorbent core (15) is arranged on the second inner wall (14); a side surface of the support column (12) close to the first absorbent core (11) abuts against the first absorbent core (11), and a side surface of the support column (12) close to the second absorbent core (15) abuts against the second absorbent core (15).

3. The liquid cooling system (1) according to claim 1, characterized in that: The distance (L1) between two adjacent support pillars (12) in the middle area of ​​the cavity is less than or equal to the distance (L2) between two adjacent support pillars (12) in the edge area of ​​the cavity.

4. The liquid cooling system (1) according to claim 1, characterized in that: The liquid cooling tube (20) comprises a plurality of straight tubes (21) arranged at intervals and a U-shaped tube (22) connecting the ends of two adjacent straight tubes (21); the straight tube (21) and the U-shaped tube (22) are integrally arranged.

5. The liquid cooling system (1) according to claim 4, characterized in that: The distance (S1) between two adjacent straight tubes (21) located in the middle area of ​​the liquid cooling plate (10) is smaller than the distance (S2) between two adjacent straight tubes (21) located in the edge area of ​​the liquid cooling plate (10).

6. The liquid cooling system (1) according to claim 4, characterized in that: The support column (12) is a plate-like structure, and the extension direction of the long side of the plate-like structure is arranged parallel to the axial direction of the straight tube (21).

7. The liquid cooling system (1) according to any one of claims 1 to 6, characterized in that: A plurality of protruding structures (16) are provided on one side surface of the liquid cooling plate (10), and a continuous channel (17) is provided on the surface of the protruding structure (16); the liquid cooling tube (20) is embedded in the channel (17), and the surface of the channel (17) is in contact with the outer wall of the liquid cooling tube (20).

8. The liquid cooling system (1) according to claim 7, characterized in that: The liquid cooling tube (20) is a circular tube, the surface of the channel (17) is an arc surface arranged concentrically with the circular tube, and the central angle of the arc length of the arc surface is greater than or equal to 60 degrees and less than or equal to 180 degrees.

9. The liquid cooling system (1) according to claim 8, characterized in that: The center angle of the arc length of a continuous arc surface of a portion of the liquid cooling tube (20) is 60 to 150 degrees, and the center angle of the arc length of a continuous arc surface of another portion is 120 to 180 degrees.

10. A battery pack (2), characterized in that: It comprises a liquid cooling system (1) as claimed in any one of claims 1 to 9 and a plurality of batteries (3), wherein the plurality of batteries (3) are arranged on a side of the liquid cooling plate (10) facing away from the liquid cooling tube (20).

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