Battery pack and battery cluster

Abstract

The invention 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 the field of energy storage batteries or power batteries, the problem of uniform heat dissipation has always been a challenge that the industry has difficulty in overcoming. Traditional battery heat dissipation methods include immersion liquid cooling systems and double-sided liquid cooling solutions.

[0003] Immersion liquid cooling systems have compatibility issues and are expensive. In the double-sided liquid cooling solution, the top liquid cooling design has limited heat dissipation effect because the heat sink can only contact the aluminum row, and there may be condensation problems. 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 end of the single battery and prevent condensation at the pole end of the single battery.

[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 protrude 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 disposed 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 as 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 heat spreader 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 channel 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 an 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, the 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. The main top surface is the side where the pole of the single cell is passed through. A part of the heat spreader is in direct contact with one end of the main side surface close to the main top surface, and the other part 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 directional manner to take away the heat. This reciprocating process can effectively dissipate the heat from the pole end of the single cell to prevent the overall temperature difference of the single cell from being too large. In addition, the heat dissipation method through the exhaust element can effectively avoid the phenomenon of condensation at the pole end of the single cell and cause a short circuit compared to the liquid cooling method. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without creative work.

[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 provided in an embodiment of the present application in a first direction;

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

[0027] Figure 4 A schematic diagram of a structure in which two single cells, two vapor chambers, a first elastic member, and a second elastic member are 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 spreader 30;

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

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] See also Figure 1 , Figure 1 A schematic diagram of the structure of a 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 the control unit is used to control the temperature and conductivity of the battery pack 100. There can be multiple battery packs 100, and multiple battery packs 100 are stacked together. Multiple battery packs 100 can be stacked together along the thickness direction, or can be arranged together along the thickness direction, length direction, and width direction at the same time.

[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, Figure 3 This is a schematic cross-sectional view of a battery pack provided in an embodiment of the present application in the second direction, wherein the first direction and the second direction are perpendicular to each other.

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

[0040] A plurality of single cells 20 are arranged in the accommodating cavity 101 at intervals, and the single cells 20 are spaced a certain distance apart from each other. The single cells 20 include a main side surface 21 and a main top surface 23. The main top surface 23 is a surface 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 may be the largest side surface in the peripheral 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 heat spreader 30 is a vacuum cavity with a microstructured inner wall, usually made of copper. When heat is conducted from the heat source to the evaporation zone, the coolant in the cavity begins to vaporize after being heated in a low vacuum environment. At this time, it absorbs heat energy and expands rapidly in volume. The gas phase cooling medium quickly fills the entire cavity. When the gas phase working medium contacts a relatively cold area, condensation will occur. The heat accumulated during evaporation is released through the condensation phenomenon, and the condensed coolant will return to the evaporation heat source through the microstructured capillary channel. This operation will be repeated in the cavity.

[0042] The heat spreader 30 is attached to one end of the main side surface 21 close to the main top surface 23, and at least part of the heat spreader 30 extends relative to the main top surface 23. The extension here means that part of the heat spreader 30 is higher than the main top surface 23 and does not contact the single cell 20. The heat sink 40 is connected to the extended part of the heat spreader 30. The heat spreader 30 is arranged between the single cell 20 and the single cell 20. The heat spreaders 30 on adjacent single cells 20 can contact each other or be spaced apart from each other. The heat spreader 30 is in contact with the main side surface 21 of the single cell 20. The heat generated by the single cell 20 during operation can be transferred to the heat spreader 30, and the heat can be dissipated to the heat sink 40 through the extended part of the heat spreader 30, thereby achieving good heat dissipation of the single cell 20. The heat spreader 30 close to the heat sink 40 is the cold end, and close to the battery is the hot end. From the cold end to the hot end, the liquid reflux in the heat spreader 30 is in the direction of gravity, which is conducive to the heat spreader 30 to achieve higher thermal conductivity.

[0043] In actual applications, the area around the pole of the single battery 20 generates more heat, so the high-temperature area of ​​the single battery 20 is mainly concentrated near the pole. Therefore, the heat spreader 30 is attached to one end of the main side surface 21 close to the main top surface 23, and the heat spreader 30 can better conduct the heat generated around the pole of the single battery 20, thereby reducing the temperature around the pole of the single battery 20. Therefore, the high-temperature area of ​​the single battery 20 can be well cooled, so that the single battery 20 can maintain a good heat-dissipating state.

[0044] The exhaust member 50 is disposed in the accommodating cavity 101. The exhaust member 50 may be a fan or a blower. The exhaust port of the exhaust member 50 is disposed opposite to the heat sink 10. The exhaust member 50 is used to drive the air in the accommodating cavity 101 to move in a directional manner to remove the heat from the heat sink 40. The exhaust member 50 may blow air toward the heat sink 40 to directly remove the heat. The exhaust member 50 may also blow air in a direction away from the heat sink 40, so that the air around the heat sink 40 can also remove the heat from the heat sink 40 by following the directional movement.

[0045] In the present application, the 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 are opposite to each other. The main top surface 23 is a side where the pole of the single cell 20 is penetrated. A part of the heat spreader 30 is in direct contact with one end of the main side surface 21 close to the main top surface 23, and another part of the heat spreader 30 is in contact with the heat sink 40. The heat of the end of the single cell 20 close to 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 directional manner to take away the heat. In this way, the pole end of the single cell 20 can be effectively dissipated to prevent the overall temperature difference of the single cell 20 from being too large. In addition, the heat dissipation method through the exhaust member 50 can effectively avoid the phenomenon of condensation at the pole end of the single cell 20 and causing a short circuit compared to the liquid cooling method.

[0046] The box body 10 includes a box cover 12 and a bottom shell 14, which are connected to form a accommodating chamber 101. A plurality of single cells 20 are arranged on the bottom shell 14. The box cover 12 covers a plurality of single cells 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 surface 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, and the cover 12 of a battery pack 100 is connected to the bottom shell 14 of an adjacent battery pack 100. The liquid cooling chamber 103 on the same battery pack 100 not only cools the air cooling chamber 102 on itself, but also contacts the cover 12 of the adjacent battery pack 100, thereby 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 the thickness direction. In each battery pack 100, there is air cooling at the top of the single battery 20 and liquid cooling at the bottom of the single battery 20. The air cooling and liquid cooling cooperate with each other to control the temperature of the single battery 20 without condensation at the top of the single battery 20. In addition, because the liquid cooling cavity 103 in each battery pack 100 is located on the bottom shell 14, when the bottom shell 14 contacts the adjacent box cover 12, the bottom shell 14 realizes heat exchange between the liquid cooling cavity 103 and the air in the accommodating cavity 101 through heat exchange with the box cover 12, so as to reuse the liquid cooling cavity 103 in the adjacent battery pack 100 to dissipate heat and cool down.

[0049] In one embodiment, the air cooling chamber 102 and the liquid cooling chamber 103 are arranged along the thickness direction of the bottom shell 14, and the air cooling chamber 102 is between the single battery 20 and the liquid cooling chamber 103. In this embodiment, the air cooling chamber 102 and the liquid cooling chamber 103 are located in different layers, the air cooling chamber 102 is located in the upper layer, and the liquid cooling chamber 103 is located in the lower layer. The air cooling chamber 102 is closer to the single battery 20, and the liquid cooling chamber 103 is closer to the box cover 12 of the adjacent battery pack 100. The advantage of this arrangement is that the upper and lower layers of the bottom shell 14 are in a uniform temperature state, and the single battery 20 will not have uneven temperature. The surface area of ​​the liquid cooling chamber 103 can also be increased to improve the cooling effect of the air cooling chamber 102.

[0050] See also Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of a structure in which two single cells 20, two heat spreaders 30, a first elastic member 60, and a second elastic member 70 are assembled together according to an embodiment of the present application. 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 further includes a first elastic member 60, which is disposed between adjacent heat spreaders 30. The first elastic member 60 has good elasticity and can be deformed during application. In practical applications, the first elastic member 60 can be made of materials such as foam, rubber, etc.

[0052] It is understandable that in the process of producing the single cell 20, there is a tolerance in the thickness of different single cells 20. Therefore, by setting the first elastic member 60 between the heat spreader 30 and the heat spreader 30, the tolerance between the single cells 20 can be eliminated by the first elastic member 60 during the assembly process of the battery pack 100, so that the initial mechanical state of each single cell 20 remains consistent. During the use of the single cell 20, if thermal runaway occurs and causes the single cell 20 to expand, the first elastic member 60 can also be used to create an expansion space for the single cell 20 to prevent the single cell 20 from catching fire. Therefore, the battery pack 100 of the embodiment of the present application, by setting the first elastic member 60, can eliminate the tolerance between the single cell 20 and the single cell 20, and create an expansion space for the thermal runaway of the single cell 20 and the single cell 20, so as to improve the stability and reliability of the battery pack 100. In addition, the first elastic member 60 also has a certain heat insulation effect, which can block the heat crosstalk on the 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 attached to the main side surface 21. The second elastic member 70 can be attached to the area on the main side surface 21 that is not attached to the heat spreader 30, or the second elastic member 70 can be partially attached. 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] It is understandable that the battery pack 100 includes the second elastic member 70, and the second elastic member 70 is disposed between adjacent single cells 20, which can fill the heat spreader 30 and cause a large gap between the single cells 20, making the overall structure of the battery pack 100 more stable. In addition, the second elastic member 70 has good elasticity, so the second elastic member 70 can also be used to absorb the tolerance between the single cells 20 and the single cells 20, and create expansion space for the bulging of the single cells 20, thereby further improving 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, Figure 5 As shown, the sum of the thickness 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 single cells 20 can be ensured to be the same, so that the vapor chamber 30 can 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 understandable that in practical applications, the first elastic member 60 and the second elastic member 70 are formed into an integral structure, so that two elastic members can be processed at one time, without 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, 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 heat spreader 30, and the second elastic member 70 can better protect the single battery 20.

[0059] In some embodiments, the thickness of the heat spreader 30 is D5, 0.4mm≤D5≤4mm, 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 diagram of the structure of the heat sink 30 provided in an embodiment of the present application.

[0061] The heat spreader 30 includes a main body 31, an extension 32, and a bend 33. The main body 31 is located between adjacent single cells 20, the extension 32 extends to the outside of the main top surface 23 in a direction away from the single cell 20, the extension 32 exceeds the main top surface 23, the bend 33 is bent relative to the extension 32, the angle between the bend 33 and the extension 32 can be 90 degrees, 80 degrees, etc., and the bend 33 fits the heat sink 40. The heat on the single cell 20 is first transferred to the main body 31, then to the extension 32, then to the bend 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 side. Figure 6 The dimensions marked above are as follows: the height of the main side surface 21 is H2, and H2 is the height of the main side surface 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. This value means 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 at 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 savings in 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 size marked on the top, 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 bending portion and the main body 31, that is, the extension portion 32 raises the distance between the bending portion and the single battery 20, thereby avoiding interference between the bending portion and parts such as the pole and the aluminum bar, 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 surface 21 is D2, and D2 is the width of the main side surface 21 at the side. Figure 4 The dimensions marked on the top are 0.5≤D1 / D2≤0.8, and the values ​​of D1 / D2 can be 0.5, 0.6, 0.7, 0.8, etc. This value is intended to express the proportion range of the extension portion 32 to the main side surface 21 in the width direction of the single battery 20. The extension portion 32 has a gap relative to the main side surface 21. Within this range, the extension portion 32 can transfer heat well, and then the heat spreader 30 can dissipate heat well at the pole end of the single battery 20, and there is no need to cover the connecting piece connecting the adjacent single battery 20. When it is less than this range, the ability of the extension portion 32 to transfer heat is limited, and then the heat spreader 30 will significantly reduce the heat dissipation effect of the pole end of the single battery 20.

[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 contacts the extended portion of the heat spreader 30, and 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 form 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 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 adjacent Figure 7 The dimensions marked on the top are as follows: the spacing between the fins 42 is D4, and D4 is the spacing between the fins 42 and the Figure 7 The dimensions marked above are 3≤D4 / D3≤7, D4 / D3 is a multiple of the width of the air duct 43 and the thickness of the fin 42, and the value of D4 / D3 can be 3, 4, 5, 6, or 7. Within this range, the air flows more smoothly in the air duct 43, 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, where H4 is the height of the base 41 at the bottom. Figure 7 The dimensions marked on the top are as follows: the height of the fin 42 is H5, and H5 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 value 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 deforming. In addition, the fin 42 can maximize the contact area with the air to improve the 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, further definition and explanation thereof is not required in subsequent drawings.

[0071] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, or are the orientation or positional relationship in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0072] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0073] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that 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, 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 arranged; A plurality of 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 extend 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, characterized in that: The battery pack includes a first elastic member, and the first elastic member is disposed between adjacent heat spreaders.

3. The battery pack according to claim 2, characterized in that: 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, characterized in that: 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.

6. The battery pack according to claim 1, characterized in that: 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 is 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.

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, characterized in that: The height of the extension portion is H3, 1mm≤H3≤20mm.

9. The battery pack according to claim 6, characterized in that: 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, characterized in that: The thickness of the heat spreader is D5, 0.4 mm≤D5≤4 mm.

11. The battery pack according to claim 1, characterized in that: The heat sink comprises a base and a plurality of fins. The base contacts a portion of the heat spreader extending therefrom. The plurality of fins are arranged at intervals on a side of the base away from the heat spreader.

12. The battery pack according to claim 11, characterized in that: 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, characterized in that: 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, characterized in that: 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 channel formed by the adjacent fins.

15. A battery cluster, characterized in that: The battery cluster comprises 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 comprises 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, the bottom shell is provided with an air cooling cavity and a liquid cooling cavity spaced from each other, the air cooling cavity and the liquid cooling cavity both extend in a direction perpendicular to the main side surface, the air cooling cavity is connected to the accommodating cavity, and the liquid cooling cavity is used to inject a coolant; A plurality of the 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 chamber and the liquid cooling chamber are arranged along the thickness direction of the bottom shell, and the air cooling chamber is between the single battery and the liquid cooling chamber.

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