Battery pack and battery cluster

Abstract

The utility model provides a battery pack and a battery cluster, the battery pack comprises a box body, a plurality of single batteries, a plurality of vapor chambers and an exhaust piece, and the box body is provided with a containing cavity; the plurality of single batteries are arranged in the accommodating cavity at intervals, each single battery comprises a main side surface and a main top surface, the main side surfaces of the adjacent single batteries are opposite to each other, and the main top surface is one surface through which the pole columns of the single batteries penetrate; the vapor chambers are attached to the ends, close to the main top face, of the main side faces, and at least part of the vapor chambers extend out relative to the main top face. The heat dissipation piece is connected with the extending part of the vapor chamber; the air exhaust piece is arranged in the containing cavity, and an air exhaust opening of the air exhaust piece is opposite to the heat dissipation piece. A circulating heat dissipation passage is formed under the action of the air exhaust part, air around the heat dissipation part moves directionally to take away heat, the pole ends of the single batteries can be effectively cooled, most of heat is absorbed when hot air passes through the liquid cooling cavity at the bottom, and the heat dissipation efficiency of the single batteries is improved. And the phenomenon of short circuit caused by condensation of the pole terminal of the single battery can be effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and a battery cluster. Background Art

[0002] For high-power battery clusters, whether in energy storage or power batteries, uniform heat dissipation remains a persistent challenge in the industry. Traditional battery cooling methods include immersion liquid cooling systems and double-sided liquid cooling solutions.

[0003] Immersion liquid cooling systems have compatibility issues and are expensive. In double-sided liquid cooling solutions, top-side liquid cooling has limited cooling effectiveness and can cause condensation, as the heat sink only contacts the aluminum ribs. Summary of the Invention

[0004] The embodiments of the present application provide a battery pack and a battery cluster, which can improve the heat dissipation efficiency of the pole ends of the single cells and prevent condensation at the pole ends of the single cells.

[0005] An embodiment of the present application provides a battery pack, which includes: a box body, multiple single cells, multiple heat spreaders and an exhaust piece, the box body is provided with a accommodating cavity; the multiple single cells are arranged in the accommodating cavity at intervals, the single cells include a main side surface and a main top surface, the main side surfaces of adjacent single cells are opposite to each other, and the main top surface is a surface through which the poles of the single cells are passed; the multiple heat spreaders are attached to one end of the main side surface close to the main top surface, and at least part of the heat spreaders protrudes relative to the main top surface; the heat sink is connected to the protruding part of the heat spreader; the exhaust piece is arranged in the accommodating cavity, and the exhaust port of the exhaust piece is arranged opposite to the heat sink.

[0006] Optionally, the battery pack includes a first elastic member, and the first elastic member is arranged between adjacent heat spreaders.

[0007] Optionally, the battery pack includes a second elastic member, which is disposed between adjacent single batteries and is in contact with the main side surface.

[0008] Optionally, the first elastic member and the second elastic member are formed into an integral structure.

[0009] Optionally, a ratio of a height of the first elastic member to a height of the second elastic member is α, and 0.5≤α≤1.

[0010] Optionally, the heat spreader includes: a main body, an extension and a bending portion connected in sequence, the main body is located between adjacent single cells, the extension extends beyond the main top surface, the bending portion is bent relative to the extension, and the bending portion is in contact with the heat sink.

[0011] Optionally, the height of the main body is H1, the height of the main side surface is H2, and 0.2≤H1 / H2≤0.5.

[0012] Optionally, the height of the extension portion is H3, 1mm≤H3≤20mm.

[0013] Optionally, the width of the extension portion is D1, the width of the main side surface is D2, and 0.5≤D1 / D2≤0.8.

[0014] Optionally, the thickness of the vapor chamber is D5, 0.4 mm ≤ D5 ≤ 4 mm.

[0015] Optionally, the heat sink includes a base and a plurality of fins, the base is in contact with a portion of the heat spreader extending therefrom, and the plurality of fins are spaced apart on a side of the base away from the heat spreader.

[0016] Optionally, the thickness of the fin is D3, the spacing between the fins is D4, and 3≤D4 / D3≤7.

[0017] Optionally, the height of the base is H4, the height of the fin is H5, and 2≤H5 / H4≤10.

[0018] Optionally, the fins extend in a direction perpendicular to the main side surface, and the air outlet of the air exhaust member is opposite to the air duct formed by adjacent fins.

[0019] An embodiment of the present application further provides a battery cluster, comprising any of the above-mentioned battery packs.

[0020] Optionally, the box body includes a box cover and a bottom shell, the box cover and the bottom shell are connected to form a accommodating cavity, multiple single batteries are arranged on the bottom shell, and an air-cooling cavity and a liquid-cooling cavity spaced apart from each other are opened in the bottom shell, the air-cooling cavity and the liquid-cooling cavity both extend in a direction perpendicular to the main side surface, the air-cooling cavity and the accommodating cavity are connected, and the liquid-cooling cavity is used to inject coolant; multiple battery packs are stacked together, and the box cover of the battery pack is connected to the bottom shell of the adjacent battery pack.

[0021] Optionally, the air cooling cavity and the liquid cooling cavity are arranged along the thickness direction of the bottom shell, and the air cooling cavity is between the single battery and the liquid cooling cavity.

[0022] In the present application, a single cell includes a main side surface and a main top surface. The main side surfaces of adjacent single cells are opposite to each other, and the main top surface is the side where the pole of the single cell is passed through. A portion of the heat spreader is in direct contact with the end of the main side surface close to the main top surface, and another portion of the heat spreader is in contact with the heat sink. The heat from the end of the single cell close to the pole is smoothly transferred to the heat sink through the heat spreader. Under the action of the exhaust element, the air around the heat sink moves in a direction to take away the heat. This reciprocating process can effectively dissipate heat from the pole end of the single cell and prevent the overall temperature difference of the single cell from being too large. In addition, the heat dissipation method of the exhaust element can effectively avoid the phenomenon of condensation at the pole end of the single cell and causing a short circuit compared to the liquid cooling method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0024] Figure 1 A schematic diagram of the structure of a battery cluster provided in an embodiment of the present application;

[0025] Figure 2 A schematic cross-sectional view of a battery pack in a first direction provided in an embodiment of the present application;

[0026] Figure 3 A schematic cross-sectional view of a battery pack in a second direction provided in an embodiment of the present application;

[0027] Figure 4 A schematic diagram of the structure of two single cells, two vapor chambers, a first elastic member, and a second elastic member assembled together according to an embodiment of the present application;

[0028] Figure 5 Provided in the embodiments of this application Figure 4 Schematic diagram of the cross section along the IV-IV direction;

[0029] Figure 6 A schematic diagram of the structure of a heat sink provided in an embodiment of the present application;

[0030] Figure 7 Provided in the embodiments of this application Figure 5 A partial enlarged schematic diagram of area A in the middle.

[0031] Description of reference numerals:

[0032] Battery pack 100, box body 10, accommodating cavity 101, box cover 12, bottom shell 14, air cooling cavity 102;

[0033] Liquid cooling chamber 103, single battery 20, main side surface 21, main top surface 23, heat sink 30;

[0034] The main body 31 , the extension portion 32 , the bending portion 33 , the heat dissipation element 40 , the base 41 , the fins 42 , the air duct 43 ; the air exhaust element 50 , the first elastic element 60 , and the second elastic element 70 . DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0036] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of the battery cluster provided in an embodiment of the present application.

[0037] The battery cluster includes a battery pack 100 and a control unit. The control unit is electrically connected to the battery pack 100 and is used to control the temperature and conductivity of the battery pack 100. Multiple battery packs 100 can be stacked together, either stacked along their thickness or arranged along their thickness, length, and width.

[0038] refer to Figures 1 to 3 , Figure 2 A schematic cross-sectional view of a battery pack in a first direction provided in an embodiment of the present application is shown. Figure 3 This is a schematic cross-sectional view of the battery pack provided in an embodiment of the present application in the second direction, where the first direction and the second direction are perpendicular to each other.

[0039] The battery pack 100 includes a housing 10 , a plurality of battery cells 20 , a plurality of vapor chambers 30 , a heat sink 40 , and an exhaust member 50 .

[0040] Multiple single cells 20 are arranged in the accommodating cavity 101 at intervals, and the single cells 20 are spaced a certain distance apart. The single cells 20 include a main side surface 21 and a main top surface 23. The main top surface 23 is the side through which the pole of the single cell 20 is passed. The main side surface 21 is adjacent to the main top surface 23. The main side surface 21 can be the largest side surface in the surrounding wall of the single cell 20. The main side surfaces 21 of adjacent single cells 20 are opposite to each other and spaced apart from each other.

[0041] The vapor chamber 30 is a vacuum chamber with a microstructured inner wall, typically made of copper. When heat is transferred from the heat source to the evaporation zone, the coolant in the chamber begins to vaporize in the low vacuum environment. This process absorbs heat energy and rapidly expands, rapidly filling the entire chamber. When the gaseous coolant comes into contact with a cooler area, it condenses. This condensation releases the heat accumulated during evaporation, and the condensed coolant then returns to the evaporation heat source via the microstructured capillaries. This process repeats itself within the chamber.

[0042] The vapor chamber 30 is attached to one end of the main side surface 21 near the main top surface 23, with at least a portion of the vapor chamber 30 extending relative to the main top surface 23. Extended here means that the portion of the vapor chamber 30 is higher than the main top surface 23 and does not contact the individual cells 20. The heat sink 40 is connected to the extended portion of the vapor chamber 30. The vapor chamber 30 is positioned between the individual cells 20. The vapor chambers 30 on adjacent individual cells 20 can be in contact or spaced apart. The vapor chamber 30 abuts the main side surface 21 of the individual cells 20. Heat generated by the individual cells 20 during operation can be transferred to the vapor chamber 30 and dissipated to the heat sink 40 through the extended portion of the vapor chamber 30, thereby achieving good heat dissipation for the individual cells 20. The vapor chamber 30 near the heat sink 40 is the cold end, and the portion near the battery is the hot end. Liquid in the vapor chamber 30 flows downward from the cold end to the hot end, following gravity, which helps the vapor chamber 30 achieve higher thermal conductivity.

[0043] In actual applications, the areas around the poles of the individual cells 20 generate the most heat, so the high-temperature areas of the individual cells 20 are primarily concentrated near the poles. Therefore, the vapor chamber 30 is attached to one end of the main side surface 21 near the main top surface 23. The vapor chamber 30 can effectively conduct heat generated around the poles of the individual cells 20, thereby reducing the temperature around the poles of the individual cells 20. This effectively cools the high-temperature areas of the individual cells 20, maintaining a well-balanced heat distribution within the individual cells 20.

[0044] An exhaust member 50 is disposed within the accommodating cavity 101. The exhaust member 50 can be a fan or a blower. The exhaust port of the exhaust member 50 is disposed opposite the heat sink 10. The exhaust member 50 is configured to drive the air within the accommodating cavity 101 to move in a directional manner, thereby removing heat from the heat sink 40. The exhaust member 50 can blow air toward the heat sink 40 to directly remove the heat. Alternatively, the exhaust member 50 can blow air away from the heat sink 40, thereby causing the air surrounding the heat sink 40 to follow the directional movement and also remove the heat from the heat sink 40.

[0045] In the present application, a single cell 20 includes a main side surface 21 and a main top surface 23. The main side surfaces 21 of adjacent single cells 20 face each other, and the main top surface 23 is the side through which the poles of the single cells 20 are inserted. A portion of the heat spreader 30 is in direct contact with the end of the main side surface 21 near the main top surface 23, and another portion of the heat spreader 30 is in contact with the heat sink 40. The heat from the end of the single cell 20 near the pole is smoothly transferred to the heat sink 40 through the heat spreader 30. Under the action of the exhaust member 50, the air around the heat sink 40 moves in a direction to carry away the heat. This reciprocating process can effectively dissipate heat from the pole end of the single cell 20 and prevent excessive temperature differences across the single cell 20. In addition, the heat dissipation method through the exhaust member 50 can effectively avoid condensation at the pole end of the single cell 20 and cause a short circuit, compared to the liquid cooling method.

[0046] The box body 10 includes a box cover 12 and a bottom shell 14. The box cover 12 and the bottom shell 14 are connected to form a accommodating chamber 101. Multiple single batteries 20 are arranged on the bottom shell 14. The box cover 12 covers multiple single batteries 20. The bottom shell 14 has an air-cooling chamber 102 and a liquid-cooling chamber 103 spaced apart from each other. The air-cooling chamber 102 and the liquid-cooling chamber 103 both extend in a direction perpendicular to the main side 21. The air-cooling chamber 102 and the liquid-cooling chamber 103 can be arranged on different layers or on the same layer. The air-cooling chamber 102 is connected to the accommodating chamber 101. The air-cooling chamber 102 is part of the air circulation flow channel. The air in the accommodating chamber 101 and the air in the air-cooling chamber 102 can communicate with each other. The liquid-cooling chamber 103 is used to inject coolant. When hot air flows through the air cooling chamber 102, the coolant in the liquid cooling chamber 103 absorbs part of the heat, thereby reducing the air temperature in the air cooling chamber 102. The coolant is connected to an external circulator, and the coolant is continuously injected and extracted in a cycle, thereby reducing the temperature of the coolant.

[0047] Multiple battery packs 100 are stacked together, with the lid 12 of one battery pack 100 connected to the bottom shell 14 of an adjacent battery pack 100. The liquid cooling chamber 103 in one battery pack 100 not only cools its own air cooling chamber 102 but also contacts the lid 12 of an adjacent battery pack 100, directly absorbing heat and cooling the air in the adjacent accommodating chamber 101.

[0048] In this embodiment, multiple battery packs 100 are stacked together along their thickness. Each battery pack 100 includes air cooling at the top of the individual cells 20 and liquid cooling at the bottom of the individual cells 20. The air cooling and liquid cooling work together to control the temperature of the individual cells 20 without condensation forming on the top of the individual cells 20. Furthermore, because the liquid cooling chamber 103 in each battery pack 100 is located on the bottom shell 14, when the bottom shell 14 contacts the adjacent case cover 12, heat exchange between the bottom shell 14 and the case cover 12 facilitates heat exchange between the liquid cooling chamber 103 and the air in the accommodating chamber 101, thereby reusing the liquid cooling chamber 103 in the adjacent battery pack 100 for heat dissipation and temperature reduction.

[0049] In one embodiment, the air-cooling chamber 102 and the liquid-cooling chamber 103 are arranged along the thickness of the bottom case 14, with the air-cooling chamber 102 located between the individual cells 20 and the liquid-cooling chamber 103. In this embodiment, the air-cooling chamber 102 and the liquid-cooling chamber 103 are located on different layers, with the air-cooling chamber 102 located on the upper layer and the liquid-cooling chamber 103 located on the lower layer. The air-cooling chamber 102 is closer to the individual cells 20, while the liquid-cooling chamber 103 is closer to the lid 12 of the adjacent battery pack 100. This arrangement provides a uniform temperature across the upper and lower layers of the bottom case 14, preventing temperature unevenness within the individual cells 20. It also increases the surface area of ​​the liquid-cooling chamber 103, enhancing the cooling effect on the air-cooling chamber 102.

[0050] See also Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of two single cells 20, two heat spreaders 30, a first elastic member 60, and a second elastic member 70 provided in an embodiment of the present application assembled together. Figure 5 Provided in the embodiments of this application Figure 4 Schematic diagram of the cross section along the IV-IV direction.

[0051] The battery pack 100 also includes a first elastic member 60, which is disposed between adjacent vapor chambers 30. The first elastic member 60 has good elasticity and can deform during use. In actual applications, the first elastic member 60 can be made of materials such as foam or rubber.

[0052] It is understandable that during the production of the individual cells 20, there are thickness tolerances between the individual cells 20. Therefore, by providing a first elastic member 60 between the heat spreaders 30, the tolerances between the individual cells 20 can be absorbed by the first elastic member 60 during the assembly of the battery pack 100, so that the initial mechanical state of each individual cell 20 remains consistent. If a thermal runaway occurs during use of the individual cells 20, causing the individual cells 20 to expand, the first elastic member 60 can also create expansion space for the individual cells 20 to prevent the individual cells 20 from catching fire. Therefore, the battery pack 100 of the embodiment of the present application, by providing the first elastic member 60, can absorb the tolerances between the individual cells 20 and create expansion space for thermal runaway between the individual cells 20, thereby improving the stability and reliability of the battery pack 100. In addition, the first elastic member 60 also has a certain thermal insulation effect, which can block heat crosstalk between adjacent heat spreaders 30.

[0053] The battery pack 100 also includes a second elastic member 70. The second elastic member 70 is arranged between adjacent single cells 20, and the second elastic member 70 is in contact with the main side surface 21. The second elastic member 70 can be affixed to the area on the main side surface 21 that is not in contact with the heat spreader 30, or the second elastic member 70 can be partially affixed. The second elastic member 70 has good elasticity and can be deformed during application. In actual applications, the second elastic member 70 can also be made of materials such as foam, rubber, etc. In addition, the second elastic member 70 also has a certain heat insulation effect, which can block the heat crosstalk on adjacent single cells 20.

[0054] As will be appreciated, the battery pack 100 includes the second elastic member 70, which is positioned between adjacent cells 20. This fills the large gaps between the cells 20 created by the vapor chamber 30, thereby enhancing the overall structural stability of the battery pack 100. Furthermore, the second elastic member 70 exhibits excellent elasticity, accommodating any tolerances between the cells 20 and creating space for expansion of any bulging cells 20, further enhancing the stability and reliability of the battery pack 100.

[0055] On the other hand, the heat spreader 30 is only arranged at one end of the main side surface 21 close to the main top surface 23, and the second elastic member 70 is arranged at the remaining position of the main side surface 21. Therefore, there is no need to use the heat spreader 30 on the entire large surface between the single cells 20 and the single cells 20, thereby reducing the material usage of the heat spreader 30 and reducing the overall cost of the battery pack 100, so that the battery pack 100 of the present application has a cost advantage.

[0056] In some embodiments, as Figure 5 As shown, the sum of the thicknesses of the vapor chamber 30, the first elastic member 60, and the vapor chamber 30 is the same as the thickness of the second elastic member 70. Therefore, the spacing between the battery cells 20 can be kept uniform, allowing the vapor chamber 30 to be tightly attached to the main side surface 21.

[0057] In some embodiments, the first elastic member 60 and the second elastic member 70 are formed into an integral structure. It is understood that in actual applications, forming the first elastic member 60 and the second elastic member 70 into an integral structure allows two elastic members to be processed at one time, eliminating the need to process the first elastic member 60 and the second elastic member 70 separately, thereby simplifying the overall processing technology and improving production efficiency.

[0058] In some embodiments, the ratio of the height of the first elastic member 60 to the height of the second elastic member 70 is α, where 0.5≤α≤1, and α can be 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, etc. Within this range, the first elastic member 60 can better protect the vapor chamber 30, and the second elastic member 70 can better protect the battery cells 20.

[0059] In some embodiments, the thickness of the heat spreader 30 is D5, 0.4 mm ≤ D5 ≤ 4 mm, and the value of D5 can be 0.4, 0.8, 1.0, 1.5, 1.8, 2.2, 2.6, 3.0, 3.4, 3.6, 3.8, 4.0, etc. Within this range, the heat spreader 30 has a good heat dissipation effect on the single battery 20, and will not occupy too much installation space of the single battery 20, thereby not reducing the energy density of the battery cluster.

[0060] please Figures 1 to 6 , Figure 6This is a schematic structural diagram of the heat spreader 30 provided in an embodiment of the present application.

[0061] The vapor chamber 30 includes a main portion 31, an extension portion 32, and a bend portion 33. The main portion 31 is positioned between adjacent battery cells 20. The extension portion 32 extends beyond the main top surface 23, away from the battery cells 20. The extension portion 32 extends beyond the main top surface 23. The bend portion 33 is bent relative to the extension portion 32. The angle between the bend portion 33 and the extension portion 32 can be 90 degrees, 80 degrees, or other angles. The bend portion 33 is in contact with the heat sink 40. Heat from the battery cells 20 is first transferred to the main portion 31, then to the extension portion 32, then to the bend portion 33, and finally to the heat sink 40.

[0062] It can be understood that the extension portion 32 extends beyond the main top surface 23 and is located outside the single cell 20. The bent portion 33 is bent relative to the extension portion 32 toward the single cell 20, which can increase the heat exchange area between the heat spreader 30 and the heat sink 40 and improve the heat dissipation performance of the heat spreader 30 to the outside world.

[0063] In an optional embodiment, the height of the main body 31 is H1, and H1 is the height of the main body 31 at the Figure 6 The dimensions marked above are as follows: the height of the main side 21 is H2, and H2 is the height of the main side 21 at the side. Figure 4 The dimensions marked on the top. 0.2≤H1 / H2≤0.5, the value of H1 / H2 can be 0.2, 0.3, 0.4, 0.5, etc. What this value means is the proportion range of the main body 31 to the main side surface 21 in the height direction of the single cell 20. Within this range, the heat spreader 30 can dissipate heat well to the pole end of the single cell 20, and there is no need for too many heat spreaders 30. When it is less than this range, the heat dissipation effect of the heat spreader 30 on the pole end of the single cell 20 will be significantly reduced; when it is greater than this range, the heat dissipation effect of the heat spreader 30 on the single cell 20 will not be significantly improved. Therefore, this solution can complete the heat dissipation of the single cell 20 under the premise of maximizing the conservation of the material of the heat spreader 30.

[0064] In an optional embodiment, the height of the extension portion 32 is H3, 1mm≤H3≤20mm, and H3 is the height of the extension portion 32 at the adjacent Figure 6 The value of H3 can be 1mm, 3mm, 5mm, 8mm, 9mm, 12mm, 13mm, 15mm, 18mm, 20mm, etc. Figure 6 As shown, the height of the extension portion 32 is the distance between the bent portion and the main portion 31, that is, the extension portion 32 raises the distance between the bent portion and the single battery 20, thereby avoiding interference between the bent portion and parts such as the pole and aluminum busbar, ensuring that the single battery 20 can be assembled normally.

[0065] In an optional embodiment, the width of the extension portion 32 is D1, and D1 is the width of the extension portion 32 at the adjacent Figure 6 The dimensions marked above are as follows: the width of the main side 21 is D2, which is the width of the main side 21 at the attached Figure 4 The dimensions marked above are 0.5≤D1 / D2≤0.8, and the values ​​of D1 / D2 can be 0.5, 0.6, 0.7, 0.8, etc. These values ​​represent the ratio of the extension portion 32 to the main side surface 21 in the width direction of the single cell 20. The extension portion 32 has a gap relative to the main side surface 21. Within this range, the extension portion 32 can effectively transfer heat, and the heat spreader 30 can effectively dissipate heat from the terminal ends of the single cell 20 without blocking the connecting tabs connecting adjacent single cells 20. When the range is smaller than this, the heat transfer capacity of the extension portion 32 is limited, and the heat spreader 30's heat dissipation effect on the terminal ends of the single cell 20 is significantly reduced.

[0066] please Figures 1 to 7 , Figure 7 Provided in the embodiments of this application Figure 5 A partial enlarged schematic diagram of area A in the middle.

[0067] The heat sink 40 includes a base 41 and a plurality of fins 42. The base 41 is in contact with the portion extending from the heat spreader 30. The plurality of fins 42 are spaced apart on the side of the base 41 away from the heat spreader 30. The fins 42 are in the shape of thin sheets, and air ducts 43 are formed between adjacent fins 42, thereby increasing the contact area between the heat sink 40 and the air to improve the heat dissipation effect. The heat sink 40 can also be other high heat absorption parts such as a liquid cooling plate. Furthermore, the fins 42 extend in a direction perpendicular to the main side surface 21, and the exhaust member 50 is opposite to the air duct 43 formed by adjacent fins 42. The directional airflow formed after the exhaust member 50 is started can directly enter the air duct 43 and take away the hot air in the air duct 43, thereby ensuring the efficiency of air circulation.

[0068] In an optional embodiment, the thickness of the fin 42 is D3, where D3 is the thickness of the fin 42 at the side. Figure 7 The dimensions marked above are as follows: the spacing between the fins 42 is D4, which is the spacing between the fins 42 and the adjacent Figure 7 The dimensions marked above are 3≤D4 / D3≤7, where D4 / D3 is a multiple of the width of the air duct 43 and the thickness of the fin 42. The value of D4 / D3 can be 3, 4, 5, 6, or 7. Within this range, the air flow in the air duct 43 is smoother, and the wind resistance is significantly reduced, thereby increasing the air circulation efficiency.

[0069] In an optional embodiment, the height of the base 41 is H4, and H4 is the height of the base 41 at the adjacent Figure 7 The dimensions marked above are as follows: the height of the fin 42 is H5, which is the height of the fin 42 at the bottom. Figure 7The dimensions marked above are 2≤H5 / H4≤10, where H5 / H4 is a multiple of the height of the fin 42 and the height of the base 41. The values ​​of H5 / H4 can be 2, 3, 4, 5, 6, 7, 8, 9, or 10. Within this range, the base 41 can better support the weight of the fin 42 without deformation. In addition, the fin 42 can maximize the contact area with the air to improve heat dissipation efficiency.

[0070] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0071] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the present invention and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0072] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0073] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0074] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized in that: include: The box body is provided with a receiving cavity; A plurality of single cells are arranged in the accommodating cavity at intervals, wherein the single cells include a main side surface and a main top surface, wherein the main side surfaces of adjacent single cells face each other, and the main top surface is a surface through which the poles of the single cells are passed; a plurality of vapor chambers, attached to one end of the main side surface close to the main top surface, with at least a portion of the vapor chambers extending relative to the main top surface; a heat sink connected to the extended portion of the vapor chamber; An exhaust member is arranged in the accommodating cavity, and an exhaust port of the exhaust member is arranged opposite to the heat dissipation member.

2. The battery pack according to claim 1, wherein: The battery pack includes a first elastic member, which is disposed between adjacent heat spreaders.

3. The battery pack according to claim 2, wherein: The battery pack includes a second elastic member, which is disposed between adjacent single batteries and is in contact with the main side surface.

4. The battery pack according to claim 3, characterized in that: The first elastic member and the second elastic member are formed into an integral structure.

5. The battery pack according to claim 3, wherein: The ratio of the height of the first elastic member to the height of the second elastic member is α, and 0.5≤α≤1.

6. The battery pack according to claim 1, wherein: The heat spreader includes: a main body, an extension and a bent portion connected in sequence, the main body is located between adjacent single cells, the extension extends beyond the main top surface, the bent portion is bent relative to the extension, and the bent portion is in contact with the heat sink.

7. The battery pack according to claim 6, characterized in that: The height of the main body is H1, the height of the main side surface is H2, and 0.2≤H1 / H2≤0.

5.

8. The battery pack according to claim 6, wherein: The height of the extension portion is H3, 1mm≤H3≤20mm.

9. The battery pack according to claim 6, wherein: The width of the extension portion is D1, the width of the main side surface is D2, and 0.5≤D1 / D2≤0.

8.

10. The battery pack according to claim 1, wherein: The thickness of the heat spreader is D5, 0.4 mm ≤ D5 ≤ 4 mm.

11. The battery pack according to claim 1, wherein: The heat sink includes a base and a plurality of fins. The base contacts a portion of the heat spreader extending therefrom. The plurality of fins are spaced apart and arranged on a side of the base away from the heat spreader.

12. The battery pack according to claim 11, wherein: The thickness of the fin is D3, the distance between adjacent fins is D4, and 3≤D4 / D3≤7.

13. The battery pack according to claim 11, wherein: The height of the base is H4, the height of the fin is H5, and 2≤H5 / H4≤10.

14. The battery pack according to claim 11, wherein: The fins extend in a direction perpendicular to the main side surface, and the air outlet of the air exhaust member is opposite to the air duct formed by the adjacent fins.

15. A battery cluster, characterized in that: The battery cluster includes the battery pack according to any one of claims 1 to 14.

16. The battery cluster according to claim 15, characterized in that The box body includes a box cover and a bottom shell, the box cover and the bottom shell are connected to form the accommodating cavity, the multiple single batteries are arranged on the bottom shell, and the bottom shell is provided with an air cooling cavity and a liquid cooling cavity spaced apart from each other, the air cooling cavity and the liquid cooling cavity both extending in a direction perpendicular to the main side surface, the air cooling cavity and the accommodating cavity are in communication, and the liquid cooling cavity is used to inject a coolant; A plurality of battery packs are stacked together, and the box cover of the battery pack is connected to the bottom shell of the adjacent battery pack.

17. The battery cluster according to claim 16, characterized in that: The air cooling cavity and the liquid cooling cavity are arranged along the thickness direction of the bottom shell, and the air cooling cavity is located between the single battery and the liquid cooling cavity.

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