Battery pack and battery cluster

Abstract

Disclosed in the present application are a battery pack and a battery cluster. The battery pack comprises: a box body, a plurality of battery cells, a plurality of vapor chambers, and an air exhaust member; the box body is provided with an accommodating cavity, the plurality of battery cells being arranged in the accommodating cavity at intervals; each battery cell comprises main side surfaces and a main top surface, the main side surfaces of adjacent battery cells being opposite to each other, and the main top surfaces being surfaces through which posts of the battery cells pass; the plurality of vapor chambers are all attached to ends of the main side surfaces close to the main top surfaces, and at least part of each vapor chamber extends beyond the main top surfaces; a heat dissipation member is connected to the extending parts of the vapor chambers; the air exhaust member is arranged in the accommodating cavity, an air exhaust port of the air exhaust member being arranged opposite to the heat dissipation member.

Description

A battery pack and battery cluster

[0001] This application claims priority to Chinese patent applications filed on October 25, 2024, with application numbers 202411501107.4 and 202422603043.0, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a battery pack and battery cluster. Background Technology

[0003] For high-power battery clusters, whether in energy storage or power batteries, achieving gentle heat dissipation remains a persistent challenge for the industry. Traditional battery cooling methods include immersion liquid cooling systems and double-sided liquid cooling solutions. Technical issues

[0004] Immersion liquid cooling systems have compatibility issues and are costly. In double-sided liquid cooling solutions, the top liquid cooling design has limited heat dissipation because the heat sink can only contact the aluminum radiator, and condensation may occur. Technical solutions

[0005] In a first aspect, this application provides a battery pack, which includes: a housing, multiple individual cells, multiple heat spreaders, and an exhaust fan. The housing has a receiving cavity. The multiple individual cells are spaced apart in the receiving cavity. Each individual cell includes a main side surface and a main top surface. The main side surfaces of adjacent individual cells face each other, and the main top surface is the surface through which the terminal post of the individual cell passes. The multiple heat spreaders are attached to the end of the main side surface near the main top surface, and at least some of the heat spreaders extend relative to the main top surface. The heat dissipation fan is connected to the extended portion of the heat spreader. The exhaust fan is disposed in the receiving cavity, and the exhaust port of the exhaust fan is disposed opposite to the heat dissipation fan.

[0006] Secondly, this application provides a battery cluster, including any of the battery packs described above. Beneficial effects

[0007] The beneficial effects provided by this application are as follows: A single cell includes a main side surface and a main top surface. The main side surfaces of adjacent single cells face each other, and the main top surface is where the terminal of the single cell passes through. A portion of the heat spreader directly contacts the end of the main side surface near the main top surface, while the other portion of the heat spreader contacts the heat sink. Heat from the end of the single cell near the terminal is smoothly transferred to the heat sink through the heat spreader. Under the action of the exhaust fan, the air around the heat sink moves directionally, carrying away the heat. This process repeats effectively, dissipating heat from the terminal of the single cell and preventing excessive temperature differences across the entire single cell. Furthermore, compared to liquid cooling, heat dissipation via the exhaust fan effectively prevents condensation at the terminal of the single cell, thus avoiding short circuits. Attached Figure Description

[0008] Figure 1 is a schematic diagram of the structure of the battery cluster provided in an embodiment of this application;

[0009] Figure 2 is a cross-sectional schematic diagram of the battery pack provided in the embodiment of this application in the first direction;

[0010] Figure 3 is a cross-sectional schematic diagram of the battery pack provided in the embodiment of this application in the second direction;

[0011] Figure 4 is a schematic diagram of the structure of two single cells, two heat dissipation plates, a first elastic element, and a second elastic element assembled together according to an embodiment of this application.

[0012] Figure 5 is a cross-sectional schematic diagram along the IV-IV direction in Figure 4 provided in an embodiment of this application;

[0013] Figure 6 is a schematic diagram of the heat spreader provided in an embodiment of this application;

[0014] Figure 7 is a partially enlarged schematic diagram of region A in Figure 5 provided in an embodiment of this application.

[0015] Explanation of reference numerals in the attached figures:

[0016] Battery pack 100, casing 10, housing cavity 101, casing cover 12, bottom shell 14, air-cooling cavity 102;

[0017] Liquid cooling cavity 103, single cell 20, main side surface 21, main top surface 23, heat dissipation plate 30;

[0018] Main body 31, extension 32, bending part 33, heat dissipation component 40, base 41, fins 42, air duct 43;

[0019] Ventilation component 50, first elastic component 60, second elastic component 70.

[0020] Implementation methods of this application

[0021] Please refer to Figure 1, which is a schematic diagram of the structure of the battery cluster provided in an embodiment of this application.

[0022] 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. There can be multiple battery packs 100, which can be stacked together. The multiple battery packs 100 can be stacked together along their thickness direction, or they can be arranged together simultaneously along their thickness direction, length direction, and width direction.

[0023] Referring to Figures 1 to 3, Figure 2 is a cross-sectional view of the battery pack provided in the embodiment of this application in the first direction, and Figure 3 is a cross-sectional view of the battery pack provided in the embodiment of this application in the second direction. The first direction and the second direction are perpendicular to each other.

[0024] The battery pack 100 includes a housing 10, multiple individual batteries 20, multiple heat spreaders 30, a heat sink 40, and an exhaust fan 50.

[0025] Multiple individual cells 20 are spaced apart in the receiving cavity 101. The individual cells 20 are spaced apart by a certain distance. Each individual cell 20 includes a main side surface 21 and a main top surface 23. The main top surface 23 is the side through which the electrode post of the individual cell 20 passes. 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 peripheral wall of the individual cell 20. The main side surfaces 21 of adjacent individual cells 20 are opposite to each other and spaced apart.

[0026] The vapor chamber 30 is a vacuum cavity with a finely structured inner wall, typically made of copper. When heat is conducted from the heat source to the evaporation zone, the coolant in the cavity, heated in a low-vacuum environment, begins to vaporize. It absorbs heat and expands rapidly, quickly filling the cavity with the gaseous cooling medium. When the gaseous working fluid comes into contact with a cooler area, condensation occurs. This condensation releases the heat accumulated during evaporation. The condensed coolant then returns to the evaporation heat source through capillary channels in the microstructure, and this process repeats continuously within the cavity.

[0027] A heat spreader 30 is attached to the end of the main side surface 21 near the main top surface 23, and at least a portion of the heat spreader 30 extends relative to the main top surface 23. This extension means that a portion of the heat spreader 30 is higher than the main top surface 23 and does not contact the individual battery cell 20. The heat sink 40 is connected to the extended portion of the heat spreader 30. The heat spreader 30 is positioned between individual batteries 20, and the heat spreaders 30 on adjacent individual batteries 20 can be in contact with each other or spaced apart. The heat spreader 30 abuts against the main side surface 21 of the individual battery cell 20. The heat generated by the individual battery cell 20 during operation can be transferred to the heat spreader 30 and dissipated to the heat sink 40 through the extended portion of the heat spreader 30, thereby achieving good heat dissipation for the individual battery cell 20. The heat spreader 30 is located at the cold end near the heat sink 40 and at the hot end near the battery cell, flowing from top to bottom. The liquid reflux within the heat spreader 30 is in the direction of gravity, which is beneficial for achieving higher thermal conductivity in the heat spreader 30.

[0028] In practical applications, the area around the terminals of the single-cell battery 20 generates the most heat, thus the high-temperature region of the single-cell battery 20 is mainly concentrated near the terminals. Therefore, the heat spreader 30 is attached to the end of the main side surface 21 near the main top surface 23. The heat spreader 30 can better conduct the heat generated around the terminals of the single-cell battery 20 away, reducing the temperature around the terminals of the single-cell battery 20. Therefore, it can effectively cool the high-temperature region of the single-cell battery 20, keeping the single-cell battery 20 in a good thermal equilibrium state.

[0029] An exhaust fan 50 is disposed in the receiving cavity 101. The exhaust fan 50 can be a fan or a blower. The exhaust port of the exhaust fan 50 is positioned opposite to the heat sink 40. The exhaust fan 50 is used to drive the air in the receiving cavity 101 to move in a specific direction, so as to remove the heat from the heat sink 40. The exhaust fan 50 can blow air towards the heat sink 40 to directly remove the heat, or it can blow air away from the heat sink 40, so that the air around the heat sink 40 moves in a specific direction and can also remove the heat from the heat sink 40.

[0030] In this 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 face each other. The main top surface 23 is the surface through which the terminals of the single cell 20 pass. 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 the other portion of the heat spreader 30 is in contact with the heat sink 40. Heat from the end of the single cell 20 near the terminals is smoothly transferred to the heat sink 40 through the heat spreader 30. Under the action of the exhaust fan 50, the air around the heat sink 40 moves in a directional manner to carry away the heat. This process repeats effectively to dissipate heat from the terminals of the single cell 20, preventing excessive temperature differences in the single cell 20. In addition, the heat dissipation method using the exhaust fan 50, compared to liquid cooling, can effectively prevent condensation at the terminals of the single cell 20, thus avoiding short circuits.

[0031] The housing 10 includes a cover 12 and a bottom shell 14. The cover 12 and the bottom shell 14 are connected to form a receiving cavity 101. Multiple individual batteries 20 are disposed on the bottom shell 14. The cover 12 covers the multiple individual batteries 20. The bottom shell 14 has air-cooled cavities 102 and liquid-cooled cavities 103 spaced apart from each other. Both air-cooled cavities 102 and liquid-cooled cavities 103 extend in a direction perpendicular to the main side 21. The air-cooled cavities 102 and liquid-cooled cavities 103 can be disposed on different layers or on the same layer. The air-cooled cavities 102 and the receiving cavity 101 are connected. The air-cooled cavities 102 are part of the air circulation channel. The air in the receiving cavity 101 and the air in the air-cooled cavities 102 can communicate with each other. The liquid-cooled cavities 103 are used to inject coolant. When hot air flows through the air-cooled cavity 102, the coolant in the liquid-cooled cavity 103 absorbs some of the heat, thereby reducing the air temperature in the air-cooled cavity 102. The coolant is connected to an external circulation machine, and the coolant is continuously circulated, injected, and extracted, thereby reducing the temperature of the coolant.

[0032] Multiple battery packs 100 are stacked together, and the cover 12 of the battery pack 100 is connected to the bottom shell 14 of the adjacent battery pack 100. The liquid cooling cavity 103 on the same battery pack 100 not only cools the air cooling cavity 102 on itself, but can also contact the cover 12 of the adjacent battery pack 100, thereby directly absorbing heat and cooling the air in the adjacent housing cavity 101.

[0033] In this embodiment, multiple battery packs 100 are stacked together along their thickness direction. Each battery pack 100 contains air cooling at the top of the individual battery cell 20 and liquid cooling at the bottom of the individual battery cell 20. The air cooling and liquid cooling work together to control the temperature of the individual battery cell 20 without condensation at the top of the individual battery cell 20. In addition, since 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 cover 12, the heat exchange between the bottom shell 14 and the cover 12 realizes the heat exchange between the liquid cooling cavity 103 and the air in the receiving cavity 101, so as to reuse the liquid cooling cavity 103 in the adjacent battery pack 100 for heat dissipation and cooling.

[0034] In one embodiment, the air-cooled cavity 102 and the liquid-cooled cavity 103 are arranged along the thickness direction of the bottom shell 14, with the air-cooled cavity 102 located between the individual battery 20 and the liquid-cooled cavity 103. In this embodiment, the air-cooled cavity 102 and the liquid-cooled cavity 103 are located on different layers, with the air-cooled cavity 102 on the upper layer and the liquid-cooled cavity 103 on the lower layer. The air-cooled cavity 102 is closer to the individual battery 20, and the liquid-cooled cavity 103 is closer to the 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, preventing uneven temperature distribution in the individual battery 20. It also increases the surface area of ​​the liquid-cooled cavity 103, thereby improving the cooling effect on the air-cooled cavity 102.

[0035] Please refer to Figures 4 and 5. Figure 4 is a structural schematic diagram of two single-cell batteries 20, two heat dissipation plates 30, a first elastic member 60, and a second elastic member 70 assembled together according to an embodiment of this application. Figure 5 is a cross-sectional schematic diagram in the IV-IV direction of Figure 4 according to an embodiment of this application.

[0036] The battery pack 100 also includes a first elastic element 60, which is disposed between adjacent heat spreaders 30. The first elastic element 60 has good elasticity and can deform during application. In practical applications, the first elastic element 60 can be made of materials such as foam or rubber.

[0037] It is understandable that during the production of individual battery cells 20, there are tolerances in the thickness of different individual battery cells 20. Therefore, by providing a first elastic member 60 between the heat spreaders 30, the tolerances between individual battery cells 20 can be absorbed during the assembly of the battery pack 100, ensuring that the initial mechanical state of each individual battery cell 20 remains consistent. If thermal runaway occurs during use, causing the individual battery cell 20 to expand, the first elastic member 60 can also create expansion space for the individual battery cell 20, preventing it from catching fire. Therefore, the battery pack 100 of this embodiment, by providing the first elastic member 60 to absorb the tolerances between individual battery cells 20 and to create expansion space for thermal runaway of individual battery cells 20, can 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 heat crosstalk between adjacent heat spreaders 30.

[0038] The battery pack 100 also includes a second elastic element 70. The second elastic element 70 is disposed between adjacent individual cells 20 and is attached to the main side surface 21. The second elastic element 70 can be attached to any area of ​​the main side surface 21 where the heat spreader 30 is not attached, or it can be partially attached. The second elastic element 70 has good elasticity and can deform during application. In practical applications, the second elastic element 70 can also be made of materials such as foam or rubber. In addition, the second elastic element 70 also has a certain heat insulation effect, which can block heat crosstalk between adjacent individual cells 20.

[0039] Understandably, the battery pack 100 includes a second elastic element 70, and the second elastic element 70 is positioned between adjacent individual cells 20. This allows it to fill the heat spreader 30, resulting in a large gap between the individual cells 20, thus making the overall structure of the battery pack 100 more stable. Furthermore, the second elastic element 70 has good elasticity, which can also absorb tolerances between individual cells 20 and create expansion space for bulging of the individual cells 20, thereby improving the stability and reliability of the battery pack 100.

[0040] On the other hand, the heat spreader 30 is only provided at one end of the main side 21 near the main top surface 23, while the second elastic member 70 is provided at the other positions of the main side 21. Therefore, it is not necessary to use the heat spreader 30 on the entire large surface between the individual cells 20, thereby reducing the amount of material used in the heat spreader 30 and reducing the overall cost of the battery pack 100, making the battery pack 100 of this application cost-effective.

[0041] In some embodiments, as shown in FIG5, the sum of the thicknesses of the heat spreader 30, the first elastic member 60, and the second elastic member 70 is the same as the thickness of the heat spreader 30. Therefore, it can be ensured that the spacing between the individual cells 20 is the same, so that the heat spreader 30 can be tightly attached to the main side 21.

[0042] In some embodiments, the first elastic element 60 and the second elastic element 70 are formed as an integral structure. It is understood that, in practical applications, forming the first elastic element 60 and the second elastic element 70 as an integral structure allows for the simultaneous processing of two elastic elements, eliminating the need to process the first elastic element 60 and the second elastic element 70 separately. This simplifies the overall processing procedure and improves production efficiency.

[0043] In some embodiments, the height ratio of the first elastic member 60 to 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 heat spreader 30, and the second elastic member 70 can better protect the individual battery cells 20.

[0044] In some embodiments, the thickness of the heat spreader 30 is D5, where 0.4mm≤D5≤4mm. 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 individual battery 20 and will not occupy too much installation space of the individual battery 20, thereby not reducing the energy density of the battery cluster.

[0045] Please refer to Figures 1 to 6. Figure 6 is a schematic diagram of the structure of the heat spreader 30 provided in the embodiment of this application.

[0046] The heat spreader 30 includes a main body 31, an extension 32, and a bent portion 33. The main body 31 is located between adjacent individual cells 20. The extension 32 extends beyond the main top surface 23 in a direction away from the individual cells 20. The bent portion 33 is bent relative to the extension 32. The angle between the bent portion 33 and the extension 32 can be 90 degrees or 80 degrees, etc. The bent portion 33 is in contact with the heat sink 40. The heat on the individual cells 20 is first transferred to the main body 31, then to the extension 32, then to the bent portion 33, and finally to the heat sink 40.

[0047] Understandably, the extension 32 extends beyond the main top surface 23 and is located outside the single cell 20. The bent portion 33 bends relative to the extension 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.

[0048] In an optional embodiment, the height of the main body 31 is H1, where H1 is the dimension of the main body 31 marked in Figure 6, and the height of the main side 21 is H2, where H2 is the dimension of the main side 21 marked in Figure 4. 0.2 ≤ H1 / H2 ≤ 0.5, where H1 / H2 can be 0.2, 0.3, 0.4, 0.5, etc. This value represents the proportion of the main body 31 to the main side 21 in the height direction of the single cell 20. Within this range, the heat dissipation plate 30 can effectively dissipate heat from the terminal end of the single cell 20 without requiring excessive heat dissipation plate 30. When the heat dissipation is less than this range, the heat dissipation effect of the heat dissipation plate 30 on the terminal end of the single cell 20 will significantly decrease; when the heat dissipation is greater than this range, the heat dissipation effect of the heat dissipation plate 30 on the single cell 20 will not significantly improve. Therefore, this solution can achieve heat dissipation of the single cell 20 while maximizing the conservation of heat dissipation plate 30 material.

[0049] In an optional embodiment, the height of the extension 32 is H3, where 1mm ≤ H3 ≤ 20mm. H3 is the dimension of the extension 32 marked in Figure 6, and the value of H3 can be 1mm, 3mm, 5mm, 8mm, 9mm, 12mm, 13mm, 15mm, 18mm, 20mm, etc. As shown in Figure 6, the height of the extension 32 is the distance between the bent portion and the main body 31. That is, the extension 32 raises the distance between the bent portion and the single cell 20, thereby avoiding interference between the bent portion and parts such as the electrode post and aluminum busbar, and ensuring that the single cell 20 can be assembled normally.

[0050] In an optional embodiment, the width of the extension 32 is D1, which is the dimension of the extension 32 marked in Figure 6, and the width of the main side 21 is D2, which is the dimension of the main side 21 marked in Figure 4. 0.5 ≤ D1 / D2 ≤ 0.8, where D1 / D2 can be 0.5, 0.6, 0.7, 0.8, etc. This value represents the proportion of the extension 32 relative to the main side 21 in the width direction of the single cell 20. The extension 32 has a gap relative to the main side 21. Within this range, the extension 32 can effectively transfer heat, allowing the heat spreader 30 to effectively dissipate heat from the terminal end of the single cell 20 without obstructing the connecting tabs of adjacent single cells 20. When the width is smaller than this range, the heat transfer capacity of the extension 32 is limited, resulting in a significant decrease in the heat dissipation effect of the heat spreader 30 on the terminal end of the single cell 20.

[0051] Please refer to Figures 1 to 7. Figure 7 is a partially enlarged schematic diagram of region A in Figure 5 provided in the embodiment of this application.

[0052] The heat sink 40 includes a base 41 and multiple fins 42. The base 41 contacts the extended portion of the heat spreader 30, and the multiple fins 42 are spaced apart on the side of the base 41 away from the heat spreader 30. The fins 42 are thin and form air ducts 43 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 a liquid cooling plate or other high heat absorption components. Optionally, the fins 42 extend in a direction perpendicular to the main side 21, and the exhaust fan 50 is opposite to the air duct 43 formed by adjacent fins 42. After the exhaust fan 50 is activated, the directional airflow formed can directly enter the air duct 43 and carry away the hot air in the air duct 43, thereby ensuring efficient air circulation.

[0053] In an optional embodiment, the thickness of the fin 42 is D3, where D3 is the dimension of the fin 42 marked in Figure 7, and the spacing of the fin 42 is D4, where D4 is the dimension of the fin 42 marked in Figure 7. 3≤D4 / D3≤7, where D4 / D3 is the ratio of the width of the air duct 43 to the thickness of the fin 42. The value of D4 / D3 can be 3, 4, 5, 6, or 7. Within this range, the airflow in the air duct 43 is smoother, the wind resistance is significantly reduced, thereby increasing the air circulation efficiency.

[0054] In an optional embodiment, the height of the base 41 is H4, where H4 is the dimension of the base 41 marked in Figure 7, and the height of the fin 42 is H5, where H5 is the dimension of the fin 42 marked in Figure 7. 2≤H5 / H4≤10, where H5 / H4 is the multiple relationship between 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 deformation. In addition, the fin 42 can maximize the contact area with air to improve heat dissipation efficiency.

Claims

A battery pack, comprising: The box body has a receiving cavity; Multiple individual cells are spaced apart in the receiving cavity. Each individual cell includes a main side surface and a main top surface. The main side surfaces of adjacent individual cells face each other. The main top surface is the side through which the terminal of the individual cell passes. Multiple heat spreaders are attached to one end of the main side surface near the main top surface, and at least a portion of the heat spreaders extend relative to the main top surface; A heat sink is connected to the extended portion of the heat spreader. An exhaust fan is disposed in the receiving cavity, and the exhaust port of the exhaust fan is disposed opposite to the heat dissipation fan. The battery pack according to claim 1, wherein: The battery pack includes a first elastic element disposed between adjacent heat spreaders. According to claim 2, the battery pack, wherein, The battery pack includes a second elastic element disposed between adjacent individual cells and in contact with the main side surface. The battery pack according to claim 3, wherein, The first elastic element and the second elastic element are formed as an integral structure. The battery pack according to claim 3, wherein, The ratio of the height of the first elastic element to the height of the second elastic element is α, where 0.5 ≤ α ≤ 1. 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 individual cells. The extension extends beyond the main top surface. The bent portion is bent relative to the extension and is in contact with the heat sink. The battery pack according to claim 6, wherein, The height of the main body is H1, and the height of the main side is H2, where 0.2 ≤ H1 / H2 ≤ 0.

5. The battery pack according to claim 6, wherein, The height of the extension is H3, where 1mm ≤ H3 ≤ 20mm. The battery pack according to claim 6, wherein, The width of the extension is D1, and the width of the main side is D2, where 0.5 ≤ D1 / D2 ≤ 0.

8. According to claim 1, the battery pack, wherein, The thickness of the heat spreader is D5, where 0.4mm ≤ D5 ≤ 4mm. According to claim 1, the battery pack, wherein, The heat sink includes a base and a plurality of fins. The base and the extended portion of the heat spreader are in contact. The plurality of fins are spaced apart on the side of the base away from the heat spreader. The battery pack according to claim 11, wherein, The thickness of the fin is D3, and the spacing between adjacent fins is D4, where 3≤D4 / D3≤7. 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. The battery pack according to claim 11, wherein, The fins extend in a direction perpendicular to the main side surface, and the exhaust port of the exhaust component is opposite to the air duct formed by the adjacent fins. A battery cluster comprising a battery pack as described in any one of claims 1 to 14. According to claim 15, the battery cluster, wherein, The housing includes a lid and a bottom shell. The lid and the bottom shell are connected to form the receiving cavity. The plurality of individual batteries are disposed on the bottom shell. The bottom shell has an air-cooling cavity and a liquid-cooling cavity spaced apart from each other. The air-cooling cavity and the liquid-cooling cavity both extend in a direction perpendicular to the main side. The air-cooling cavity and the receiving cavity are connected. The liquid-cooling cavity is used to inject coolant. Multiple battery packs are stacked together, and the cover of the battery pack is connected to the bottom shell of the adjacent battery pack. According to the battery cluster of claim 16, wherein, The air-cooled cavity and the liquid-cooled cavity are arranged along the thickness direction of the bottom shell, with the air-cooled cavity located between the individual battery cell and the liquid-cooled cavity.

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