Heat dissipation device, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a heat dissipation device, a battery pack and electric equipment. The heat dissipation device is used for dissipating heat of a battery cell and a control assembly. The heat dissipation device comprises a cooling plate, a first heat pipe and a second heat pipe, the first end of the first heat pipe and the first end of the second heat pipe are connected with the cooling plate, the second end of the first heat pipe is connected with the battery cell, and the second end of the second heat pipe is connected with the control assembly. According to the heat dissipation device in the embodiment of the invention, the cooling effect on the battery cell and the control assembly can be improved, so that the thermal stability and the thermal reliability of the battery pack are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a heat dissipation device, a battery pack, and an electrical device. Background Technology

[0002] With the rapid development of economy and technology, battery packs are being used more and more widely. A battery pack is a power source that provides power to electrical equipment. It consists of battery cells and control components, both of which generate heat during operation. To shorten the fast charging time of the battery pack, this is usually achieved by increasing the charging current while keeping the voltage constant, especially at high rates like 6C / 7C. In these cases, the heat generation of the battery cells and control components increases dramatically, requiring cooling to extend the lifespan of the battery cells at high rates and ensure the normal operation of the control components. However, poor cooling of the battery cells and control components results in poor thermal stability and reliability of the battery pack. Utility Model Content

[0003] This application provides a heat dissipation device, a battery pack, and an electrical device to improve the cooling effect of the battery cells and control components, thereby improving the thermal stability and thermal reliability of the battery pack.

[0004] In a first aspect, embodiments of this application provide a heat dissipation device for dissipating heat from a battery cell and control components. The heat dissipation device includes: a cooling plate, a first heat pipe, and a second heat pipe.

[0005] The first end of the first heat pipe and the first end of the second heat pipe are both connected to the cooling plate, the second end of the first heat pipe is connected to the battery cell, and the second end of the second heat pipe is connected to the control component.

[0006] In some possible implementations, the second end of the first heat pipe is attached to the housing of the battery cell and at least partially surrounds the tab of the battery cell.

[0007] In some possible implementations, the second end of the first heat pipe has a clearance groove through which the tab passes.

[0008] In some possible implementations, the first heat pipe includes a first tube body and a second tube body connected together, and the interior of the first tube body and the second tube body forms a closed first cavity for containing a first heat transfer medium.

[0009] The first tube is connected to the cooling plate, the second tube is connected to the battery cell, and the end of the second tube away from the first tube forms the clearance groove.

[0010] In some possible implementations, the end of the first tube connected to the cooling plate is higher than the end of the second tube connected to the battery cell, and the first heat transfer medium is a gas-liquid phase change material.

[0011] In some possible implementations, the second tube body includes a first segment and at least two second segments;

[0012] One end of the first segment is connected to the first pipe body, and the other end of the first segment is connected to the at least two second segments. The clearance groove is formed between the ends of two adjacent second segments that are away from the first segment.

[0013] In some possible implementations, the heat dissipation device further includes a first thermally conductive adhesive or a first thermally conductive pad disposed between the second segment and the battery cell.

[0014] In some possible implementations, the control component includes a first control box and a second control box disposed opposite to each other;

[0015] The second end of the second heat pipe extends between the first control box and the second control box.

[0016] In some possible implementations, the second heat pipe includes a third tube body, a fourth tube body, and a fifth tube body connected in sequence, wherein the interior of the third tube body, the fourth tube body, and the fifth tube body forms a closed second cavity for containing a second heat transfer medium;

[0017] The third tube is connected to the cooling plate, and at least part of the fifth tube is located between the first control box and the second control box.

[0018] In some possible implementations, the end of the third tube connected to the cooling plate is higher than the end of the fifth tube located between the first control box and the second control box, and the second heat transfer medium is a gas-liquid phase change material.

[0019] In some possible implementations, the heat dissipation device further includes a second thermally conductive adhesive or a second thermally conductive pad disposed between the second end of the second heat pipe and the first control box;

[0020] And / or, the heat dissipation device further includes a third thermally conductive adhesive or a third thermally conductive pad disposed between the second end of the second heat pipe and the second control box;

[0021] And / or, one of the first control box and the second control box is a battery management system, and the other of the first control box and the second control box is a battery pack circuit breaker unit.

[0022] In some possible implementations, multiple battery cells are provided, and each battery cell has tabs on opposite sides.

[0023] The first heat pipe is provided in multiple ways, and each tab is provided with one first heat pipe.

[0024] This application embodiment also provides a battery pack, including: a bottom shell, battery cells, control components, and a heat dissipation device;

[0025] The heat dissipation device includes: a cooling plate, a first heat pipe and a second heat pipe, the cooling plate and the bottom shell forming a receiving cavity, and the battery cell, the control component, the first heat pipe and the second heat pipe are all disposed in the receiving cavity;

[0026] The first end of the first heat pipe and the first end of the second heat pipe are both connected to the cooling plate, the second end of the first heat pipe is connected to the battery cell, and the second end of the second heat pipe is connected to the control component.

[0027] This application also provides an electrical device, including the battery pack described above.

[0028] The heat dissipation device, battery pack, and electrical equipment provided in this application embodiment are connected to a cooling plate via the first ends of a first heat pipe and the first ends of a second heat pipe. The second end of the first heat pipe is connected to the battery cell, and the second end of the second heat pipe is connected to the control component. This improves the cooling efficiency of high-temperature components such as the battery cell and control component under fast charging conditions, thereby increasing the charging current of the battery pack and extending its charging life. Furthermore, the cooling plate can simultaneously cool the battery cell and the control component, achieving overall cooling of the battery pack and improving the overall temperature uniformity of the battery pack. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0030] Figure 1 A schematic diagram of the battery pack provided in this application;

[0031] Figure 2 An exploded view of the battery pack provided in this application;

[0032] Figure 3 Another exploded view of the battery pack provided in this application;

[0033] Figure 4 A schematic diagram of the heat dissipation device provided in this application;

[0034] Figure 5A schematic diagram of the heat dissipation device and battery cell provided in this application;

[0035] Figure 6 A schematic diagram of the first heat pipe provided for this application;

[0036] Figure 7 A partial schematic diagram of the heat dissipation device and control components provided in this application;

[0037] Figure 8 A schematic diagram of the second heat pipe provided for this application;

[0038] Figure 9 A schematic diagram of the second heat pipe and control assembly provided in this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 10-Battery Pack;

[0041] 20 - Heat dissipation device; 21 - First heat pipe; 22 - Second heat pipe; 23 - Cooling plate;

[0042] 30 - Bottom shell; 31 - Mounting port;

[0043] 40 - Battery cell; 41 - Electrode; 42 - Connecting piece;

[0044] 50 - Control component; 51 - First control box; 52 - Second control box;

[0045] 61 - Positive electrode outlet; 62 - Negative electrode outlet;

[0046] 71-First thermal pad; 72-Second thermal pad; 73-Third thermal pad;

[0047] 81-First tube body; 82-Second tube body; 83-First segment; 84-Second segment; 85-Avoidance groove; 86-First cavity;

[0048] 91-The third tube body; 92-The fourth tube body; 93-The fifth tube body; 94-The second cavity. Detailed Implementation

[0049] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0050] Battery cells and control components generate heat during operation and require cooling. Cooling of the tabs within the battery cell is typically achieved through methods such as shaped cold plates, large-area cooling, and phase change material cooling. Shaped cold plates are formed by bending to fit the tabs; large-area cooling refers to cooling the tabs by attaching the cold plate to the large surface of the battery cell; and phase change material cooling utilizes a structure filled with phase change material for cooling.

[0051] Of the cooling methods mentioned above, irregularly shaped cold plates are difficult to process, requiring high flatness and perpendicularity, and are difficult to assemble after cell stacking. Large-area cooling can improve cell temperature uniformity, but due to the high thermal resistance of the cell perpendicular to the large area, the thermal conductivity is poor, resulting in poor cooling effect. Phase change material cooling has high requirements for material packaging, and the phase change material itself has a small heat capacity, resulting in poor actual cooling effect.

[0052] Cooling of the control components is achieved through air cooling, liquid cooling, thermoelectric cooling, and bonding to a cold plate. Air cooling utilizes natural convection. Liquid cooling typically involves connecting a cooling pipe and a cold plate in parallel from the main cooling channel. Thermoelectric cooling utilizes the Boldt effect. Cooling by bonding to the cold plate involves directly attaching the component to the cold plate using thermal pads or adhesive.

[0053] Among these methods, air cooling and semiconductor cooling are simple but have poor cooling performance, especially for rapid temperature rises at high speeds. Liquid cooling requires connection to a cold plate, resulting in complex piping and potential leaks within the battery pack. Using a glued cold plate requires control components to be placed close to the cold plate.

[0054] The heat dissipation device provided in this application connects the battery cell and the cooling plate via a first heat pipe and the control component and the cooling plate via a second heat pipe. This improves the cooling efficiency of high-temperature components such as the battery cell and control component under fast charging conditions, thereby increasing the charging current of the battery pack and extending its charging life. Furthermore, the cooling plate can simultaneously cool the battery cell and the control component, achieving overall cooling of the battery pack and improving the overall temperature uniformity of the battery pack.

[0055] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0056] This application provides an embodiment of an electrical device, including electric vehicles, electric trains, electric bicycles, golf carts, mobile phones, portable devices, laptops, electric toys, power tools, and ships. Electric vehicles include pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles. See also... Figure 1The electrical device includes a battery pack 10 for storing and providing electrical energy. For example, the battery pack 10 may be a lithium-ion battery.

[0057] Please refer to Figures 1 to 9 The battery pack 10 specifically includes a bottom shell 30, battery cells 40, control components 50, and a heat dissipation device 20. The bottom shell 30 can be in the form of a tray, having a bottom plate and side plates surrounding the edge of the bottom plate. The heat dissipation device 20 is fastened to the bottom shell 30 and forms a receiving cavity with the bottom shell 30 to accommodate the battery cells 40, control components 50, etc.

[0058] The battery cell 40 can be shaped like a cuboid, for example, a blade battery cell. Multiple battery cells 40 can be arranged at least along a first direction, where the first direction is the width direction of the battery cell 40. Figure 2 The X direction is shown. For example, as... Figure 2 As shown, multiple battery cells 40 are arranged along a first direction to form a column. Alternatively, multiple battery cells 40 are arranged along both the first and second directions to form at least two columns arranged along the second direction, which intersects the first direction. The second direction is the length direction of the battery cell 40. Figure 2 Y direction shown in .

[0059] Multiple battery cells 40 are connected by connecting pieces 42, for example, two adjacent battery cells 40 are welded together by connecting pieces 42. Figure 2 and Figure 3 As shown, after being connected, the multiple battery cells 40 can also be connected to the control component 50 via the positive terminal lead 61 and the negative terminal lead 62. Both the positive terminal lead 61 and the negative terminal lead 62 can be copper-aluminum busbars. The multiple battery cells 40 can be integrated into a battery module, which is then formed into a battery pack 10, i.e., the battery pack 10 is in CTB (Cell to Module) form. Alternatively, the multiple battery cells 40 can be directly integrated into the battery pack 10, i.e., the battery pack 10 is in CTP (Cell to Pack) form. The integration method of the battery cells 40 is not limited in this embodiment.

[0060] The battery cell 40 includes a housing and tabs 41 extending from the housing, which allow for external connection of the battery cell 40. In some possible examples, the tabs 41 are located on the side of the housing, meaning the battery cell 40 has polarity on both sides. Specifically, such as... Figure 2 As shown, each battery cell 40 includes two tabs 41 disposed opposite each other along a second direction, one of which is a positive tab and the other is a negative tab. Multiple positive tabs are arranged in a row along a first direction, and multiple negative tabs are arranged in a row along the first direction.

[0061] See Figure 2 and Figure 3The control component 50 is located beside the battery cell 40, and a mounting port 31 may be provided in the area of ​​the bottom shell 30 opposite to the control component 50. The mounting port 31 penetrates the bottom shell 30 and exposes the control component 50, allowing the control component 50 to pass through. For example, the mounting port 31 is located at the front of the bottom shell 30, that is, the control component 50 is located at the head of the bottom shell 30, so that the control component 50 can be installed or removed from the front of the bottom shell 30, thereby facilitating the removal, placement, and maintenance of the control component 50.

[0062] In some possible examples, the control component 50 includes a first control box 51 and a second control box that are positioned opposite each other. For example, the first control box 51 and the second control box 52 are positioned opposite each other along a third direction, which intersects both the first and second directions. For example, the first direction, the second direction and the third direction are perpendicular to each other. The third direction is the height direction of the battery pack 10, which is also the thickness direction.

[0063] In this system, one of the first control box 51 and the second control box 52 is a Battery Management System (BMS), and the other is a Battery Distribution Unit (BDU). For example, the first control box 51 is the Battery Management System, and the second control box 52 is the Battery Distribution Unit. The Battery Management System monitors the state of the battery cells 40 to control the charging and discharging process of the entire battery pack 10, ensuring the safety and stability of the battery pack 10. The Battery Distribution Unit controls the current and voltage to ensure the safety and stability of the battery pack 10.

[0064] like Figure 2 and Figure 3 As shown, the battery management system and the battery pack circuit breaker unit are arranged vertically, with the battery management system located above the battery pack circuit breaker unit, meaning it is closer to the heat dissipation device 20. A partition is also provided between the battery management system and the battery pack circuit breaker unit. This partition creates a certain distance between them, allowing the heat dissipation device 20 to simultaneously cool both the battery management system and the battery pack circuit breaker unit. The partition is arranged circumferentially along the battery pack circuit breaker unit and has an opening, for example, facing the battery cell 40. The partition can be an integral part of either the battery pack circuit breaker unit or the battery management system.

[0065] Continue reading Figures 1 to 9The heat dissipation device 20 is used to dissipate heat from the battery cell 40 and the control component 50. The heat dissipation device 20 includes a cooling plate 23, a first heat pipe 21, and a second heat pipe 22. The cooling plate 23 and the bottom shell 30 enclose a receiving cavity, within which the battery cell 40, control component 50, first heat pipe 21, and second heat pipe 22 are all disposed. Thus, the bottom shell 30, battery cell 40, and cooling plate 23 form a sandwich structure, with the cooling plate 23 at the top, the battery cell 40 in the middle, and the bottom shell 30 at the bottom. The cooling plate 23 can be a liquid-cooled plate to primarily cool the area of ​​the battery cell 40. Cooling pipes are provided inside or on one side of the cooling plate 23, and coolant, such as water, is placed within the cooling pipes, resulting in good cooling performance.

[0066] The first end of the first heat pipe 21 and the first end of the second heat pipe 22 are both connected to the cooling plate 23. The second end of the first heat pipe 21 is connected to the battery cell 40, and the second end of the second heat pipe 22 is connected to the control component 50. Connecting the battery cell 40 to the cooling plate 23 using the first heat pipe 21 and connecting the control component 50 to the cooling plate 23 using the second heat pipe 22 improves the cooling efficiency of high-temperature components such as the battery cell 40 and the control component 50 under fast charging conditions, thereby increasing the charging current of the battery pack 10 and extending its charging life. Furthermore, the cooling plate 23 can simultaneously cool the battery cell 40 and the control component 50, achieving overall cooling of the battery pack 10 and improving the overall temperature uniformity of the battery pack 10.

[0067] Both the first heat pipe 21 and the second heat pipe 22 are closed structures, and after being evacuated, they are filled with a first heat transfer medium and a second heat transfer medium, respectively. At least one of the first heat transfer medium and the second heat transfer medium is made of phase change material (PCM). By utilizing the phase change heat transfer of the first heat pipe 21 and the second heat pipe 22 and contacting the heat-generating component, the heat exchange efficiency is high and leakage is not easily detected.

[0068] See Figure 4 and Figure 5 The second end of the first heat pipe 21 is attached to the casing of the battery cell 40 and at least partially surrounds the tab 41 of the battery cell 40. This allows the first heat pipe 21 to be closer to the tab 41 and have a larger contact area, improving heat transfer efficiency and thus enhancing the cooling effect near the tab 41. The material of the first heat pipe 21 includes copper.

[0069] In some possible examples, the second end of the first heat pipe 21 may completely surround the tab 41, for example, the second end of the first heat pipe 21 may have a clearance hole that fits over the tab 41. In other possible examples, see [reference needed]. Figure 5 and Figure 6The second end of the first heat pipe 21 partially surrounds the tab 41. For example, the second end of the first heat pipe 21 has a relief groove 85, and the tab 41 passes through the relief groove 85. In this way, the tab 41 can be inserted from the relief groove 85, so that the second end of the first heat pipe 21 and the tab 41 can be installed vertically, which facilitates the assembly of the heat dissipation device 20.

[0070] The number of first heat pipes 21 is matched with the number of tabs 41. Specifically, multiple battery cells 40 are provided, and tabs 41 are provided on opposite sides of each battery cell 40. Multiple first heat pipes 21 are provided, and each tab 41 is associated with one first heat pipe 21. In this way, each tab 41 has a corresponding first heat pipe 21 for heat dissipation, which can reduce the temperature difference between all tabs 41 and improve temperature uniformity.

[0071] For details, please refer to Figure 4 and Figure 5 Multiple battery cells 40 are arranged in a row, with tabs 41 at both ends of each cell 40. Tabs 41 on the same side of each cell 40 are also arranged in a row, forming two rows of tabs. Multiple first heat pipes 21 are also arranged in two rows, with one row of first heat pipes 21 corresponding to one row of tabs 41, and the other row of first heat pipes 21 corresponding to the other row of tabs 41.

[0072] See Figures 4 to 6 The first heat pipe 21 includes a first tube body 81 and a second tube body 82 connected together. The interiors of the first tube body 81 and the second tube body 82 form a closed first cavity 86, which is used to contain a first heat transfer medium. The first tube body 81 is connected to a cooling plate 23, and the second tube body 82 is connected to a battery cell 40. A clearance groove 85 is formed at the end of the second tube body 82 away from the first tube body 81. In this way, the first heat pipe 21 forms a hollow, closed cavity. The first cavity can be filled with the first heat transfer medium and then sealed to prevent leakage of the first heat transfer medium.

[0073] One end of the first tube 81 is connected to one end of the second tube 82, for example, the first tube 81 and the second tube 82 are an integral structure. The side of the first tube 81 is flush with the corresponding side of the second tube 82, for example, as... Figure 6 As shown, the two opposite ends of the first tube 81 are aligned with the opposite ends of the second tube 82. The first tube 81 and the second tube 82 are generally L-shaped and formed by bending, i.e., the first heat pipe 21 is irregularly shaped. The first tube 81 forms the short side of the first heat pipe 21, which is attached to the cooling plate 23 to connect the low-temperature region. The second tube 82 forms the long side of the first heat pipe 21, which is attached to the surface where the tab 41 in the shell is located to connect the high-temperature region.

[0074] In some possible examples, the end of the first tube 81 connected to the cooling plate 23 is higher than the end of the second tube 82 connected to the battery cell 40, and the first heat transfer medium is a gas-liquid phase change material. Thus, the first end of the first heat pipe 21 is higher than the second end of the first heat pipe 21, and the first end of the first heat pipe 21 is connected to the low-temperature region, while the second end of the first heat pipe 21 is connected to the high-temperature region. The gas-liquid phase change material can be any existing phase change material capable of transitioning between liquid and gaseous states, which will not be elaborated further here.

[0075] With this configuration, the first heat transfer medium in the high-temperature region will evaporate into a gaseous state. The gaseous first heat transfer medium has a lower density and will rise to the higher low-temperature region and condense into a liquid state. The liquid first heat transfer medium has a higher density and will flow to the lower high-temperature region. This repeated cycle can achieve the purpose of heat transfer and cooling, thereby cooling the tab 41.

[0076] Continue reading Figure 6 The second tube 82 includes a first segment 83 and at least two second segments 84. One end of the first segment 83 is connected to the first tube 81, and the other end of the first segment 83 is connected to at least two second segments 84. The ends of two adjacent second segments 84 away from the first segment 83 form a clearance groove 85. In this way, the end of the second tube 82 away from the first tube 81 can be branched, thereby forming a clearance groove 85 to avoid the tab 41.

[0077] For example, the second tube 82 includes a first segment 83 and two second segments 84. The first tube 81, the first segment 83, and the second segment 84 are connected sequentially, and the first segment 83 and the second segment 84 form a flat plate. The two second segments 84 are spaced apart, for example, equally spaced, so that the second tube 82 is U-shaped overall, providing a large space between the two second segments 84. The end faces of the two second segments 84 that are far from each other are flush with the opposite end faces of the first segment 83. Alternatively, the ends of the two second segments 84 adjacent to the first segment 83 are in contact, while the ends far from the first segment 83 are far apart, making the second tube 82 Y-shaped overall.

[0078] As another example, the second pipe body 82 includes a first segment 83 and a plurality of second segments 84, wherein the plurality of second segments 84 are spaced apart, or some of the second segments 84 are spaced apart, or the plurality of second segments 84 are in contact with each other. A clearance groove 85 is formed between the ends of two second segments 84 that are away from the first segment 83.

[0079] See Figure 3 and Figure 5The heat dissipation device 20 also includes a first thermally conductive adhesive or a first thermally conductive pad 71 disposed between the second segment 84 and the battery cell 40. The first thermally conductive adhesive enables a fixed connection between the first heat pipe 21 and the battery cell 40, and ensures effective heat conduction between the first heat pipe 21 and the tab 41. The first thermally conductive pad 71 improves the heat conduction efficiency between the first heat pipe 21 and the tab 41. The first thermally conductive adhesive or the first thermally conductive pad 71 can also be disposed between the first segment 83 and / or the first tube body 81, and the shape of the first thermally conductive adhesive or the first thermally conductive pad 71 may be adapted to, for example, the shape of the second tube body 82.

[0080] Specifically, a first thermally conductive adhesive is provided between the second segment 84 and the battery cell 40 to bond the first heat pipe 21 to the battery cell 40, thus fixing the first heat pipe 21 and the battery cell 40 together. Alternatively, a first thermally conductive pad 71, which can be a metal pad, can be provided between the second segment 84 and the battery cell 40 to improve heat conduction efficiency. The first thermally conductive pad 71 and the second segment 84 are fixed together by means of snap-fit ​​or other methods. After the first heat pipe 21 and the battery cell 40 are relatively fixed, the first heat pipe 21 abuts against the cooling plate 23 to achieve adhesion between the first heat pipe 21 and the cooling plate 23. Of course, the first heat pipe 21 and the cooling plate 23 can also be fixed together by the first thermally conductive adhesive or by other methods.

[0081] See Figures 7 to 9 In some possible embodiments, the control assembly 50 includes a first control box 51 and a second control box 52 disposed opposite to each other; a second end of a second heat pipe 22 extends between the first control box 51 and the second control box 52. Thus, the second heat pipe 22 can simultaneously cool the first control box 51 and the second control box 52, reducing the temperature difference between them. The second heat pipe 22 is made of copper.

[0082] In some possible implementations, such as Figure 7 and Figure 8 As shown, the second heat pipe 22 includes a third pipe body 91, a fourth pipe body 92, and a fifth pipe body 93 connected in sequence. The interiors of the third pipe body 91, the fourth pipe body 92, and the fifth pipe body 93 form a closed second cavity 94 for containing the second heat transfer medium. The third pipe body 91 is connected to the cooling plate 23, and at least a portion of the fifth pipe body 93 is located between the first control box 51 and the second control box 52. In this way, the second heat pipe 22 forms a hollow, closed cavity. The second cavity 94 can be filled with the second heat transfer medium and then sealed to prevent leakage of the second heat transfer medium.

[0083] Among them, such as Figure 8 and Figure 9As shown, one end of the third tube 91 is connected to one end of the fourth tube 92, and the other end of the fourth tube 92 is connected to one end of the fifth tube 93. The other end of the fifth tube 93 is inserted between the first control box 51 and the second control box 52. The fifth tube 93 can be entirely or mostly located between the first control box 51 and the second control box 52 to increase the heat transfer area between the second heat pipe 22 and the first control box 51 and the second control box 52.

[0084] The third tube 91, fourth tube 92, and fifth tube 93 can be an integral structure. The corresponding sides of the third tube 91, fourth tube 92, and fifth tube 93 are flush; for example, the opposite ends of the third tube 91, fourth tube 92, and fifth tube 93 are aligned. The third tube 91, fourth tube 92, and fifth tube 93 are Z-shaped as a whole and are formed by bending, i.e., the irregular shape of the second heat pipe 22. The third tube 91 forms the short side of the second heat pipe 22, which is attached to the cooling plate 23 to connect the low-temperature region. The fifth tube 93 forms the long side of the second heat pipe 22, which is attached to the surface where the tab 41 in the casing is located to connect the high-temperature region.

[0085] In some possible examples, the end of the third tube 91 connected to the cooling plate 23 is higher than the end of the fifth tube 93 located between the first control box 51 and the second control box 52, and the second heat transfer medium is a gas-liquid phase change material. The first end of the second heat pipe 22 is higher than the second end of the second heat pipe 22, and the first end of the second heat pipe 22 is connected to the low-temperature region, while the second end of the second heat pipe 22 is connected to the high-temperature region.

[0086] With this configuration, the second heat transfer medium in the high-temperature region will evaporate into a gaseous state. The gaseous second heat transfer medium, with its lower density, will rise to a higher, lower-temperature region and condense into a liquid state. The liquid second heat transfer medium, with its higher density, will flow to a lower, higher-temperature region. This reciprocating cycle achieves heat transfer and cooling, thus cooling the control component 50.

[0087] In other possible embodiments, the control assembly 50 includes a first control box 51 and a second control box 52 disposed opposite to each other, and at least two second heat pipes 22 are provided, with at least one second heat pipe 22 corresponding to each of the first control box 51 and the second control box 52. For example, a second end of a second heat pipe 22 is respectively provided on the surfaces of the first control box 51 and the second control box 52 that are opposite to each other. Alternatively, a second end of a second heat pipe 22 is respectively provided on the same side surfaces of the first control box 51 and the second control box 52. Or, a second end of a second heat pipe 22 is provided on both the surfaces of the first control box 51 and the second control box 52 that are opposite to each other, and between the first control box 51 and the second control box 52. The first ends of at least two second heat pipes 22 can be stacked on the cooling plate 23, or they can both be in contact with the cooling plate 23. The arrangement of the first control box 51, the second control box 52, and the at least two second heat pipes 22 is not limited in this application embodiment.

[0088] Continue reading Figure 9 The heat dissipation device 20 further includes a second thermally conductive adhesive or a second thermally conductive pad disposed between the second end of the second heat pipe 22 and the first control box 51; and / or, the heat dissipation device 20 further includes a third thermally conductive adhesive or a third thermally conductive pad 73 disposed between the second end of the second heat pipe 22 and the second control box 52.

[0089] The second thermally conductive adhesive is used to securely connect the second heat pipe 22 to the first control box 51, ensuring effective heat conduction between them. The second thermally conductive pad 72 is used to improve the heat conduction efficiency between the second heat pipe 22 and the first control box 51. The third thermally conductive adhesive is used to securely connect the second heat pipe 22 to the second control box 52, ensuring effective heat conduction between them. The third thermally conductive pad 73 is used to improve the heat conduction efficiency between the second heat pipe 22 and the second control box 52.

[0090] For example, a second thermally conductive adhesive is provided between the fifth tube 93 and the first control box 51, and the second heat pipe 22 is bonded to the first control box 51 using the second thermally conductive adhesive to achieve relative fixation between the two. At this time, the fifth tube 93 and the second control box 52 are in direct contact, and their surfaces are in contact; or, a third thermally conductive adhesive is provided between the fifth tube 93 and the second control box 52, and the second heat pipe 22 is bonded to the second control box 52 using the third thermally conductive component, thereby achieving fixation.

[0091] For example, a second thermal pad 72 is disposed between the fifth tube 93 and the first control box 51, and a third thermal pad 73 is disposed between the fifth tube 93 and the second control box 52. The second and third thermal pads 72 and 73 can be metal pads to improve thermal conductivity. The shape and size of the second and third thermal pads 72 and 73 can be adapted to the fifth tube 93, for example, their outer circumferences can be aligned. The first and second control boxes 51 are fixedly connected, thereby pressing the second thermal pad 72, the fifth tube 93, and the third thermal pad 73 together, thus fixing the second thermal pad 72, the second heat pipe 22, the third thermal pad 73, and the control assembly 50. After the second heat pipe 22 and the control assembly 50 are relatively fixed, the second heat pipe 22 abuts against the cooling plate 23 to achieve adhesion between the second heat pipe 22 and the cooling plate 23. Of course, the second heat pipe 22 and the cooling plate 23 can also be bonded or fixed by other means.

[0092] The heat dissipation device 20 in this embodiment is used to dissipate heat from the battery cell 40 and the control component 50. The heat dissipation device 20 includes a cooling plate 23, a first heat pipe 21, and a second heat pipe 22. The first end of the first heat pipe 21 and the first end of the second heat pipe 22 are both connected to the cooling plate 23. The second end of the first heat pipe 21 is connected to the battery cell 40, and the second end of the second heat pipe 22 is connected to the control component 50. On the one hand, it improves the cooling efficiency of high-temperature components such as the battery cell 40 and the control component 50 under fast charging conditions, thereby increasing the charging current of the battery pack 10 and extending the charging life of the battery pack 10. On the other hand, the cooling plate 23 can simultaneously cool the battery cell 40 and the control component 50, thereby achieving overall cooling of the battery pack 10 and improving the overall temperature uniformity of the battery pack 10.

[0093] The embodiments or implementation methods described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0094] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat dissipation device, characterized in that, The heat dissipation device (20) is used to dissipate heat from the battery cell (40) and the control assembly (50). The heat dissipation device (20) includes: a cooling plate (23), a first heat pipe (21), and a second heat pipe (22). The first end of the first heat pipe (21) and the first end of the second heat pipe (22) are both connected to the cooling plate (23), the second end of the first heat pipe (21) is connected to the battery cell (40), and the second end of the second heat pipe (22) is connected to the control component (50).

2. The heat dissipation device according to claim 1, characterized in that, The second end of the first heat pipe (21) is attached to the housing of the battery cell (40) and at least partially surrounds the tab (41) of the battery cell (40).

3. The heat dissipation device according to claim 2, characterized in that, The second end of the first heat pipe (21) has a relief groove (85), through which the tab (41) passes.

4. The heat dissipation device according to claim 3, characterized in that, The first heat pipe (21) includes a first tube body (81) and a second tube body (82) connected to each other. The interior of the first tube body (81) and the second tube body (82) forms a closed first cavity (86), which is used to contain a first heat transfer medium. The first tube (81) is connected to the cooling plate (23), the second tube (82) is connected to the battery cell (40), and the end of the second tube (82) away from the first tube (81) forms the clearance groove (85).

5. The heat dissipation device according to claim 4, characterized in that, The end of the first tube (81) connected to the cooling plate (23) is higher than the end of the second tube (82) connected to the battery cell (40), and the first heat transfer medium is a gas-liquid phase change material.

6. The heat dissipation device according to claim 4, characterized in that, The second tube (82) includes a first segment (83) and at least two second segments (84); One end of the first segment (83) is connected to the first tube body (81), and the other end of the first segment (83) is connected to the at least two second segments (84). The clearance groove (85) is formed between the ends of two adjacent second segments (84) away from the first segment (83).

7. The heat dissipation device according to claim 6, characterized in that, The heat dissipation device (20) further includes a first thermally conductive adhesive or a first thermally conductive pad (71) disposed between the second segment (84) and the battery cell (40).

8. The heat dissipation device according to any one of claims 1-7, characterized in that, The control component (50) includes a first control box (51) and a second control box (52) disposed opposite to each other; The second end of the second heat pipe (22) extends between the first control box (51) and the second control box (52).

9. The heat dissipation device according to claim 8, characterized in that, The second heat pipe (22) includes a third tube body (91), a fourth tube body (92) and a fifth tube body (93) connected in sequence. The interior of the third tube body (91), the fourth tube body (92) and the fifth tube body (93) forms a closed second cavity (94), which is used to contain the second heat transfer medium. The third tube (91) is connected to the cooling plate (23), and at least part of the fifth tube (93) is located between the first control box (51) and the second control box (52).

10. The heat dissipation device according to claim 9, characterized in that, The end of the third tube (91) connected to the cooling plate (23) is higher than the end of the fifth tube (93) located between the first control box (51) and the second control box (52), and the second heat transfer medium is a gas-liquid phase change material.

11. The heat dissipation device according to claim 8, characterized in that, The heat dissipation device (20) further includes a second thermally conductive adhesive or a second thermally conductive pad (72) disposed between the second end of the second heat pipe (22) and the first control box (51). And / or, the heat dissipation device (20) further includes a third thermally conductive adhesive or a third thermally conductive pad (73) disposed between the second end of the second heat pipe (22) and the second control box (52). And / or, one of the first control box (51) and the second control box (52) is a battery management system, and the other of the first control box (51) and the second control box (52) is a battery pack (10) circuit breaker unit.

12. The heat dissipation device according to any one of claims 2-7, characterized in that, Multiple battery cells (40) are provided, and each battery cell (40) has tabs (41) on its opposite sides. The first heat pipe (21) is provided in multiple ways, and each tab (41) is provided with one first heat pipe (21).

13. A battery pack, characterized in that, include: The bottom shell (30), the battery cell (40), the control assembly (50), and the heat dissipation device (20); The heat dissipation device (20) includes: a cooling plate (23), a first heat pipe (21) and a second heat pipe (22). The cooling plate (23) and the bottom shell (30) enclose a cavity. The battery cell (40), the control component (50), the first heat pipe (21) and the second heat pipe (22) are all disposed in the cavity. The first end of the first heat pipe (21) and the first end of the second heat pipe (22) are both connected to the cooling plate (23), the second end of the first heat pipe (21) is connected to the battery cell (40), and the second end of the second heat pipe (22) is connected to the control component (50).

14. An electrical appliance, characterized in that, Includes the battery pack (10) as described in claim 13.

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