Battery pack and electric equipment

Abstract

The utility model relates to the field of battery packs, in particular to a battery pack and electric equipment. The battery pack comprises a box body, a heat dissipation structure and a battery cell, the battery cell is arranged in the box body; the battery cell is of a prism structure, and chamfers are arranged at the edges; a plurality of battery cells are arranged in an array, the chamfers of a plurality of adjacent battery cells enclose to form a mounting cavity, and / or the chamfers of two adjacent battery cells and the box body enclose to form a mounting cavity, and / or the chamfers of the battery cells and the corners of the box body enclose to form a mounting cavity; the heat dissipation structure comprises a first heat dissipation pipe and a heat dissipation fin assembly. The first heat dissipation pipe penetrates through and is fixedly installed in the installation cavity, and the heat dissipation fin assembly is arranged between the first heat dissipation pipe and the hole wall of the installation cavity and arranged in the extending direction of the first heat dissipation pipe. Therefore, the overall occupied space of the heat dissipation structure and the battery cells can be reduced, the space in the box body can be saved, and the energy density in the battery pack is improved while the heat dissipation capability of the battery pack is ensured.

Description

Technical Field

[0001] This application relates to the field of battery packs, and more particularly to a battery pack and an electrical device. Background Technology

[0002] Existing power batteries generate a significant amount of heat during high-power charging and discharging. To address this, engineers typically incorporate liquid cooling systems into the batteries. However, these systems require considerable space within the battery. For the same volume, power batteries with liquid cooling systems have lower energy densities than those without. Reducing the size of the liquid cooling system, on the other hand, severely impacts its heat dissipation efficiency and effectiveness. Therefore, how to rationally plan the space allocated to a liquid cooling system while ensuring its heat dissipation efficiency and effectiveness is a pressing technical problem that needs to be solved in this field. Utility Model Content

[0003] To address the aforementioned problems, this utility model provides a battery pack and an electrical device.

[0004] In a first aspect, this application provides a battery pack, which includes a housing, a heat dissipation structure, and battery cells;

[0005] The battery cell is disposed inside the housing; the battery cell has a prism structure and side edges, and the battery cell has chamfers at two adjacent side edges; multiple battery cells are disposed and arranged in an array, the chamfers of adjacent multiple battery cells form a mounting cavity, and / or the chamfers of two adjacent battery cells and the housing form a mounting cavity; and / or the chamfers of the battery cells and the corners of the housing form the mounting cavity;

[0006] The heat dissipation structure includes a first heat dissipation pipe and a heat sink assembly; the first heat dissipation pipe passes through and is disposed within the mounting cavity, and the heat sink assembly is disposed between the first heat dissipation pipe and the wall of the mounting cavity and is arranged along the extension direction of the first heat dissipation pipe.

[0007] Optionally, the heat sink assembly includes a first heat sink; the first heat sink is fixedly disposed on the first heat sink pipe, and multiple first heat sinks are arranged at intervals along the extension direction of the first heat sink pipe; the first heat sink is in contact with the chamfered bevel.

[0008] Optionally, the heat sink assembly includes a second heat sink, which is fixedly disposed on the chamfered surface, and multiple second heat sinks are arranged at intervals along the extension direction of the first heat sink; the second heat sink is in contact with the first heat sink.

[0009] Optionally, the heat sink assembly includes a plurality of first heat sinks and a plurality of second heat sinks, wherein the plurality of first heat sinks are fixedly disposed at intervals on the first heat pipe, and the plurality of second heat sinks are fixedly disposed at intervals on the chamfered inclined surface; the plurality of first heat sinks and the plurality of second heat sinks are arranged alternately along the extension direction of the first heat pipe.

[0010] Optionally, the second heat sink is provided with a clearance notch, and the clearance notch located on at least two adjacent cells encloses a clearance space for the first heat sink tube to pass through.

[0011] Optionally, the interval between two adjacent first heat sinks in the extension direction of the first heat pipe is equal, and the interval between two adjacent second heat sinks in the extension direction of the first heat pipe is equal.

[0012] Optionally, the heat dissipation structure includes a second heat dissipation pipe and a third heat dissipation pipe; along the extending direction of the first heat dissipation pipe, the first heat dissipation pipe has a first end and a second end, the second heat dissipation pipe is connected to the first end of the first heat dissipation pipe, and the third heat dissipation pipe is connected to the second end of the first heat dissipation pipe.

[0013] Optionally, the second heat dissipation pipe is arranged above the third heat dissipation pipe, the second heat dissipation pipe having an outlet for refrigerant to flow out; the third heat dissipation pipe having an inlet for refrigerant to flow in.

[0014] Optionally, the battery pack further includes a heat sink, the battery cell has a side surface, a top surface and a bottom surface, and the heat sink is fixed to the side surface and the bottom surface of the battery cell and is fixedly connected to at least one of the first heat sink, the second heat sink and the third heat sink.

[0015] Secondly, embodiments of this application also provide an electrical device, which includes any of the battery packs described above.

[0016] In some implementations of this application, the battery pack includes a housing, a heat dissipation structure, and battery cells. The battery cells are prismatic with chamfered edges, and multiple cells are arranged in an array within the housing. The chamfers of adjacent cells form a mounting cavity, and / or the chamfers of two adjacent cells and the housing form a mounting cavity, and / or the chamfers of the cells and the corners of the housing form a mounting cavity. The heat dissipation structure specifically includes a first heat dissipation pipe and a heat sink assembly. The first heat dissipation pipe passes through and is fixedly installed in the mounting cavity, and the heat sink assembly is disposed between the first heat dissipation pipe and the wall of the mounting cavity and extends radially along the first heat dissipation pipe. The battery pack of this application utilizes the chamfers of the battery cells to create space for the first heat dissipation pipe, that is, utilizing the unused areas between the cells to set up a heat dissipation structure for cooling the cells. This reduces the overall space occupied by the heat dissipation structure and the battery cells, saving space within the housing. With the same housing volume, this can increase the energy density within the battery pack while ensuring its heat dissipation capacity. Meanwhile, the battery pack described in this application utilizes the space between the chamfers of two adjacent cells and the casing, and the space between the chamfers of the cells and the corners of the casing, to form an installation cavity, increasing the space available for the first heat dissipation pipe within the battery pack. This helps to increase the heat exchange area between the cells and the heat dissipation structure within the battery pack, thereby giving the battery pack superior heat dissipation capabilities.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is an isometric view of the battery pack described in one embodiment of this application;

[0020] Figure 2 yes Figure 1 Top view;

[0021] Figure 3 yes Figure 1 A bottom view;

[0022] Figure 4 yes Figure 1 Axonometric view of the battery cell and heat dissipation assembly;

[0023] Figure 5 yes Figure 4 Axonometric view from another perspective;

[0024] Figure 6 yes Figure 4 Top view;

[0025] Figure 7 This is an isometric view of the first heat sink and the first heat sink in one embodiment of this application;

[0026] Figure 8 yes Figure 7 The front view;

[0027] Figure 9 yes Figure 7 Top view;

[0028] Figure 10 This is a top view of the first heat pipe and the first heat sink in one embodiment of this application;

[0029] Figure 11 yes Figure 10 A schematic diagram of the structure after being combined with the battery cell;

[0030] Figure 12 yes Figure 11 Top view;

[0031] Figure 13 This is a schematic diagram of the structure of the electrical equipment described in this application;

[0032] Reference numerals: 1. Battery pack; 11. Heat dissipation structure; 111. First heat dissipation pipe; 112. Heat dissipation fin assembly; 112a. First heat dissipation fin; 112b. Second heat dissipation fin; 1121. Clearance notch; 113. Second heat dissipation pipe; 1131. Outlet; 114. Third heat dissipation pipe; 1141. Inlet; 12. Battery cell; 12a. First side; 12b. Second side; 12c. Third side; 121. Chamfer; 13. Mounting cavity; 14. Heat dissipation plate; 2. Electrical equipment; 21. Heat exchanger; 22. Motor; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0033] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0034] In existing battery packs, battery cells are typically prismatic or cylindrical in structure. For prismatic cells, the outer casing usually has chamfers due to the internal winding. For example, one type of cell has an overall shape close to a tetrahedral prism, i.e., a cube. Chamfers are formed at the four edges extending along its height, so that the cross-sectional shape of the cell in the height direction is actually an octagon. In a battery pack, multiple cells are usually stacked within the pack. In this case, a certain amount of unused space is formed between the chamfers of the cells. This unused space results in a large overall space occupied by the stacked cells, leading to wasted space within the battery pack and thus hindering the improvement of the energy density within the battery pack.

[0035] To ensure adequate heat dissipation for the battery cells, a heat dissipation structure is required within the battery pack to cool the cells. This heat dissipation structure further occupies space within the battery pack, reducing the number of battery cells that can be placed within a given battery pack volume, thus lowering the battery pack's energy density.

[0036] In order to ensure heat dissipation of the battery cells while reducing the overall space occupied by the heat dissipation structure and the battery cells within the battery pack, embodiments of this application provide a battery pack and an electrical device.

[0037] refer to Figure 1 , Figure 2 and Figure 3 Firstly, this application provides a battery pack 1. The battery pack 1 provided by this application specifically includes a housing, Figure 1 The heat dissipation structure 11 and the battery cell 12 are shown. The housing is the structural component used to house the battery cell 12, and its shape and dimensions can be determined according to actual needs. Typically, the housing is cubic in shape, and its interior also has a cubic cavity to accommodate the battery cell 12.

[0038] refer to Figure 4 , Figure 5 and Figure 6The battery cell 12 has a prism structure and side edges, and the battery cell 12 has chamfers 121 at two adjacent side edges. Multiple battery cells 12 are arranged in an array inside the housing, and the chamfers 121 of the multiple battery cells 12 form a mounting cavity 13. For battery cells 12 adjacent to the inner wall of the housing, the chamfers 121 of two adjacent battery cells 12 and the inner wall of the housing form a mounting cavity 13. In this embodiment, the battery cell 12 can be an octagonal prism structure. Specifically, the battery cell 12 has two first side surfaces 12a arranged at intervals along a first direction X, and two second side surfaces 12b arranged at intervals along a second direction Y. The height direction of the battery cell 12 is arranged along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are orthogonal to each other and not coplanar. A third side surface 12c connects adjacent first side surfaces 12a and second side surfaces 12b to form the chamfers 121 of the battery cell 12. The edges where the first side 12a and the third side 12c meet, and the edges where the second side 12b and the third side 12c meet, are the side edges of the battery cell 12. The third side 12c is the bevel of the chamfer 121. The angle between the third side 12c and the first side 12a and the second side 12b can be set according to specific needs. Preferably, the angle between the third side 12c and the first side 12a and the second side 12b is 135 degrees. In other embodiments, for example, the angle between the third side 12c and the first side 12a can be 120 degrees, and the angle between the third side 12c and the second side 12b can be 150 degrees.

[0039] refer to Figure 2 The battery cells 12 can be arranged in an array within the housing along a first direction X and a second direction Y. In this case, the first side surfaces 12a of adjacent battery cells 12 in the first direction X remain in contact, and the second side surfaces 12b of adjacent battery cells 12 in the second direction Y remain in contact. The third side surfaces 12c of four adjacent battery cells 12 form a cubic cavity extending along a third direction Z; this cavity is the mounting cavity 13. For a battery cell 12 adjacent to the housing, the third side surfaces 12c of two adjacent battery cells 12 form a groove extending along a third direction Z, and the groove has a V-shaped cross-section. This groove and the inner wall of the housing form a cavity extending along a third direction Z; this cavity is the mounting cavity 13. For a battery cell 12 adjacent to a corner of the housing, the third side surface 12c of this battery cell 12 and the corner of the housing form the mounting cavity 13. The corner of the housing is the corner formed by the intersection of two adjacent inner walls of the housing.

[0040] refer to Figure 7 , Figure 8 and Figure 9The heat dissipation structure 11 specifically includes a first heat dissipation pipe 111 and a heat sink assembly 112. The first heat dissipation pipe 111 is a pipe structure for supplying coolant or cold air. It is preferably made of materials with good heat dissipation capabilities, such as copper, copper alloy, or aluminum alloy. The first heat dissipation pipe 111 passes through and is fixedly installed within the mounting cavity 13, with its extension direction aligned with the penetration direction of the mounting cavity 13. The heat sink assembly 112 is disposed between the first heat dissipation pipe 111 and the wall of the mounting cavity 13, and is arranged along the extension direction of the first heat dissipation pipe 111. During heat dissipation, the coolant within the first heat dissipation pipe 111 can carry away the heat dissipated by the battery cell 12. The heat sink assembly 112 increases the heat dissipation area between the first heat dissipation pipe 111 and the battery cell 12, thereby improving the heat dissipation efficiency between the battery cell 12 and the first heat dissipation pipe 111.

[0041] Since the mounting cavity 13 is formed by the chamfer 121 of the battery cell 12, the space can be effectively utilized when the first heat dissipation pipe 111 and the heat sink assembly 112 are arranged in the mounting cavity 13. This satisfies the heat dissipation requirements of the battery cell 12 while avoiding an increase in the total space occupied by the battery cell 12 and the heat dissipation structure 11. This saves space inside the casing, allowing for a larger number of battery cells 12 to be arranged within the same volume, thereby increasing the energy density inside the battery pack 1. Simultaneously, by using the space between the chamfer 121 of two adjacent battery cells 12 and the casing, and the space between the chamfer 121 of the battery cell 12 and the corner of the casing to form the mounting cavity 13, the battery pack 1 increases the space available for arranging the first heat dissipation pipe 111 inside the battery pack 1. This helps to increase the heat exchange area between the battery cell 12 and the heat dissipation structure 11 inside the battery pack 1, thus giving the battery pack 1 a better heat dissipation capacity.

[0042] It should be noted that for battery cells 12 arranged in an array only along the first direction X or the second direction Y, the mounting cavity 13 is formed by two adjacent battery cells 12 and the inner wall of the housing. For battery cells 12 arranged in an array along both the first direction X and the second direction Y, the mounting cavity 13 can be formed by only four adjacent battery cells 12, or it can have a mounting cavity 13 formed by two battery cells 12 and the inner wall of the housing, or a mounting cavity 13 formed by four adjacent battery cells 12. Among the arrayed battery cells 12, the third side 12c of the battery cells 12 located at the four corners can form a mounting cavity 13 separately with the corner of the housing.

[0043] In this embodiment, the octagonal prism structure of the battery cell 12 is merely an exemplary implementation. In other embodiments, the battery cell 12 may also adopt other prism structures such as pentagonal prisms or hexagonal prisms, in which case the direction of the array arrangement of the battery cell 12 will also change. For example, when the battery cell 12 adopts a hexagonal prism structure, it is preferable that the cross-section of the battery cell 12 in the height direction is a regular hexagon, and chamfers 121 are provided at the two side edges of the battery cell 12 extending in the height direction. When the battery cell 12 is arrayed in the housing, six adjacent battery cells 12 form the aforementioned mounting cavity 13. In other words, the specific prism structure adopted by the battery cell 12 depends on the actual needs. Correspondingly, the array arrangement of the battery cell 12 in the housing can be specifically set according to the specific prism structure adopted by the battery cell 12. At this time, the number of battery cells 12 forming the mounting cavity 13 will also change accordingly, and this embodiment does not strictly limit this.

[0044] refer to Figure 4 , Figure 5 In some embodiments of this application, the heat sink assembly 112 includes a first heat sink 112a. The first heat sink 112a is fixedly disposed on the first heat sink pipe 111, and multiple first heat sinks 112a are spaced apart along the extension direction of the first heat sink pipe 111. The first heat sink 112a contacts the beveled surface of the chamfer 121 to improve the heat exchange efficiency between the first heat sink 112a and the battery cell 12. In other words, the first heat sink 112a and the first heat sink pipe 111 form a finned tube structure, where the first heat sink 112a is the fin in the finned tube structure, and the first heat sink pipe 111 is the tube body used for circulating refrigerant. The arrangement of the first heat sink 112a can increase the heat exchange area between the first heat sink pipe 111 and the battery cell 12, improving the heat exchange efficiency between the first heat sink pipe 111 and the battery cell 12, so that the heat on the battery cell 12 can be carried away by the refrigerant in the first heat sink pipe 111 in a timely manner, preventing the battery cell 12 from overheating during operation and avoiding dangerous accidents such as fire or explosion of the battery cell 12. In this application, the first heat sink 112a may have an outer shape of Figure 10 , Figure 11 and Figure 12 The rectangular sheet shown, or Figure 7 , Figure 8 and Figure 9 The specific structure of the circular sheet shown depends on the actual needs.

[0045] refer to Figure 4 , Figure 5In some embodiments of this application, the heat sink assembly 112 includes a second heat sink 112b. The second heat sink 112b is fixedly disposed on the chamfered surface 121 of the battery cell 12, and multiple second heat sinks 112b are spaced apart along the extending direction of the first heat sink 111. The second heat sink 112b contacts the first heat sink 111 to improve the heat exchange efficiency between the second heat sink 112b and the first heat sink 111. The arrangement of the second heat sink 112b also increases the heat exchange area between the first heat sink 111 and the battery cell 12, improving the heat exchange efficiency between the first heat sink 111 and the battery cell 12, so that the heat on the battery cell 12 can be carried away by the refrigerant in the first heat sink 111 in a timely manner, preventing the battery cell 12 from overheating during operation and avoiding dangerous accidents such as fire or explosion of the battery cell 12.

[0046] refer to Figure 4 , Figure 5 In some embodiments of this application, the heat sink assembly 112 includes multiple first heat sinks 112a and multiple second heat sinks 112b. The first heat sinks 112a are fixedly disposed on the first heat sink 111, and multiple such heat sinks are arranged at intervals along the extension direction of the first heat sink 111. In other words, the multiple first heat sinks 112a and the first heat sink 111 form a finned tube structure, where the first heat sinks 112a are the fins in the finned tube structure, and the first heat sink 111 is the tube body used for circulating refrigerant. The second heat sinks 112b are fixedly disposed on the chamfered surface 121 of the battery cell 12, and multiple second heat sinks 112b are arranged at intervals along the extension direction of the first heat sink 111. The multiple first heat sinks 112a and multiple second heat sinks 112b are arranged alternately along the extension direction of the first heat sink 111. The arrangement of the first heat sink 112a and the second heat sink 112b can also increase the heat exchange area between the first heat pipe 111 and the battery cell 12, and improve the heat exchange efficiency between the first heat pipe 111 and the battery cell 12, so that the heat on the battery cell 12 can be carried away by the refrigerant in the first heat pipe 111 in time, preventing the battery cell 12 from overheating during operation and avoiding dangerous accidents such as fire or explosion of the battery cell 12.

[0047] refer to Figure 4 , Figure 5In some embodiments of this application, a clearance notch 1121 is provided on the second heat sink 112b. The clearance notch 1121 on at least two adjacent battery cells 12 encloses a clearance space. This clearance space allows the first heat pipe 111 to pass through. Specifically, the clearance notch 1121 on the second heat sink 112b can be rectangular. When the battery cells 12 adopt the aforementioned quadrangular prism structure and are arranged in an array along the first direction X and the second direction Y, the clearance notches 1121 on four adjacent battery cells 12 form a clearance space. This clearance space penetrates the second heat sink 112b along the extension direction of the first heat pipe 111, and its cross-section in the extension direction of the first heat pipe 111 is rectangular. Of course, the clearance notch 1121 on the second heat sink 112b can also be fan-shaped, semi-circular, etc. The specific shape of the clearance notch 1121 depends on the actual needs and will not be listed in detail here. The avoidance notch 1121 prevents interference between the second heat sink 112b and the first heat pipe 111, allowing the cells 12 to be arranged more closely together without being affected by the second heat sink 112b. This further reduces the overall space occupied by the heat dissipation structure 11 and the cells 12, thereby saving space inside the casing and allowing more cells 12 to be arranged in the same volume, significantly improving the energy density inside the battery pack 1.

[0048] In some embodiments of this application, the spacing between two adjacent first heat sinks 112a in the extension direction of the first heat sink 111 is equal, and the spacing between two adjacent second heat sinks 112b in the extension direction of the first heat sink 111 is equal. In other words, the first heat sinks 112a and the second heat sinks 112b are arranged at equal intervals in the extension direction of the first heat sink 111. This helps to ensure that the spacing between adjacent first heat sinks 112a and adjacent second heat sinks 112b remains equal. When the battery cell 12 is transferred from the second heat sink 112b to the first heat sink 112a, the heat dissipation efficiency and effect between any pair of adjacent first heat sinks 112a and second heat sinks 112b are the same. This helps to ensure uniform heat dissipation of the battery cell 12 and prevent poor heat dissipation in some areas of the battery cell 12.

[0049] refer to Figure 1 , Figure 2 , Figure 3In some embodiments of this application, the heat dissipation structure 11 includes a second heat dissipation pipe 113 and a third heat dissipation pipe 114. The first heat dissipation pipe 111 has a first end and a second end along its extension direction. The second heat dissipation pipe 113 communicates with the first end of the first heat dissipation pipe 111, and the third heat dissipation pipe 114 communicates with the second end of the first heat dissipation pipe 111. The second heat dissipation pipe 113 and the third heat dissipation pipe 114 can respectively contact two opposite sides of the battery cell 12 arranged along the extension direction of the first heat dissipation pipe 111, thereby increasing the heat dissipation area between the heat dissipation structure 11 and the battery cell 12 and improving the heat exchange efficiency between them. This further prevents the battery cell 12 from overheating during operation and avoids dangerous accidents such as fire or explosion of the battery cell 12.

[0050] refer to Figure 1 In some embodiments of this application, the second heat dissipation pipe 113 is arranged above the third heat dissipation pipe 114. In other words, relative to the ground, the second heat dissipation pipe 113 is positioned higher than the third heat dissipation pipe 114 in the battery pack 1. The second heat dissipation pipe 113 has an outlet 1131 for refrigerant to flow out, and the third heat dissipation pipe 114 has an inlet 1141 for refrigerant to flow in. The refrigerant flows from the lower-positioned third heat dissipation pipe 114 into the first heat dissipation pipe 111, then from the first heat dissipation pipe 111 into the second heat dissipation pipe 113, and finally flows out from the outlet 1131 in the second heat dissipation pipe 113. This ensures sufficient heat exchange between the refrigerant and the battery cell 12, avoiding waste of the refrigerant's cooling capacity.

[0051] refer to Figure 3 In some embodiments of this application, the battery pack 1 includes a heat sink 14. The battery cell 12 has a side surface, a top surface, and a bottom surface. The heat sink 14 is fixedly connected to the side surface and bottom surface of the battery cell 12 for heat exchange. The heat sink 14 and the battery cell 12 can be connected by thermally conductive adhesive or by a structure such as fasteners. Simultaneously, the heat sink 14 is fixedly connected to at least one of the first heat sink 111, the second heat sink 113, and the third heat sink 114 for heat exchange. The connection between the heat sink 14 and the first heat sink 111, the second heat sink 113, and the third heat sink 114 can be any of the following methods: adhesive bonding, welding, or structural connection. The heat sink 14 can increase the heat dissipation area of ​​the battery pack 1, thereby significantly improving the heat dissipation efficiency of the battery pack 1.

[0052] The heat sink 14 is preferably a vapor chamber. A vapor chamber is a highly efficient heat dissipation device, typically made of copper, aluminum, or other materials with high thermal conductivity. It achieves rapid and uniform heat distribution and efficient heat dissipation by utilizing the principle of phase change heat transfer. The vapor chamber contains a working fluid that circulates within it, transferring heat through evaporation and condensation. This gives the heat sink 14 highly efficient heat dissipation capabilities, while also ensuring uniform heat dissipation, thus preventing localized overheating of the battery pack 1.

[0053] Secondly, this application embodiment also provides an electrical device 2, which includes a battery pack 1 as described above.

[0054] The electrical equipment 2 described in this application embodiment can be a vehicle, or a large mechanical device, electronic device, etc., that requires power from the battery pack 1. This application does not limit the specific type of electrical equipment 2. The battery pack 1 provides electrical energy to the electrical equipment 2 to ensure its normal operation. Taking a vehicle as an example, refer to... Figure 12 The vehicle is equipped with a battery pack that powers the vehicle's motor 22. The vehicle also features a water pump and heat exchanger 21 to cool the battery pack using coolant.

[0055] This application embodiment employs any of the battery packs 1 described above to reduce the space occupied by the battery pack 1 within the electrical device 2, while simultaneously increasing the energy density of the battery pack 1. (Reference) Figure 1 , Figure 2 , Figure 3Specifically, the battery pack 1 includes a housing, a heat dissipation structure 11, and battery cells 12. In this embodiment, the housing is a structural component for accommodating the battery cells 12. The housing is cubic in shape, and its interior also has a cubic cavity to accommodate the battery cells 12. The battery cells 12 have a prism structure and side edges, and the battery cells 12 have chamfers 121 at two adjacent side edges. Multiple battery cells 12 are arranged in an array inside the housing, and the chamfers 121 of the multiple battery cells 12 form a mounting cavity 13. For battery cells 12 adjacent to the inner wall of the housing, the chamfers 121 of two adjacent battery cells 12 and the inner wall of the housing form a mounting cavity 13. In this embodiment, the battery cells 12 can be an octagonal prism structure. Specifically, the battery cells 12 have two first side edges 12a arranged at intervals along a first direction X, and two second side edges 12b arranged at intervals along a second direction Y. The height direction of the battery cells 12 is arranged along a third direction Z, and the first direction X, the second direction Y, and the third direction Z are orthogonal to each other and not coplanar. A third side 12c connects adjacent first side 12a and second side 12b to form a chamfer 121 of the battery cell 12. The edges where the first side 12a and third side 12c meet, and the edges where the second side 12b and third side 12c meet, are the side edges of the battery cell 12. The battery cells 12 are arranged in an array within the housing along the first direction X and the second direction Y. At this time, the first side 12a of adjacent battery cells 12 in the first direction X remain in contact, and the second side 12b of adjacent battery cells 12 in the second direction Y remain in contact. The third side 12c of four adjacent battery cells 12 form a cubic cavity extending along the third direction Z, which is the mounting cavity 13. For a battery cell 12 adjacent to the housing, the third side 12c of two adjacent battery cells 12 form a groove extending along the third direction Z, and the cross-section of the groove is V-shaped. The groove and the inner wall of the housing form a through cavity extending in the third direction Z, which is the mounting cavity 13. For the battery cell 12 adjacent to the corner of the housing, the third side 12c of the battery cell 12 and the corner of the housing form a mounting cavity. The corner of the housing is the corner formed by the intersection of two adjacent inner walls of the housing.

[0056] refer to Figure 4 , Figure 5The heat dissipation structure 11 specifically includes a first heat dissipation pipe 111 and a heat sink assembly 112. The first heat dissipation pipe 111 is a pipe structure for supplying coolant or cold air. It is preferably made of materials with good heat dissipation capabilities, such as copper, copper alloy, or aluminum alloy. The first heat dissipation pipe 111 passes through and is fixedly installed within the mounting cavity 13, with its extension direction aligned with the penetration direction of the mounting cavity 13. The heat sink assembly 112 is disposed between the first heat dissipation pipe 111 and the wall of the mounting cavity 13 and extends radially along the first heat dissipation pipe 111. During heat dissipation, the coolant within the first heat dissipation pipe 111 can carry away the heat dissipated by the battery cell 12. The heat sink assembly 112 increases the heat dissipation area between the first heat dissipation pipe 111 and the battery cell 12, thereby improving the heat dissipation efficiency between the battery cell 12 and the first heat dissipation pipe 111.

[0057] The heat sink assembly 112 includes a first heat sink 112a. The first heat sink 112a is fixedly disposed on the first heat dissipation pipe 111, and multiple first heat sinks 112a are arranged at intervals along the extending direction of the first heat dissipation pipe 111. In other words, the first heat sink 112a and the first heat dissipation pipe 111 form a finned tube structure, wherein the first heat sink 112a is the fin in the finned tube structure, and the first heat dissipation pipe 111 is the pipe body used for circulating refrigerant. In this application, the first heat sink 112a can be a rectangular or circular plate, and its specific structure depends on the actual needs.

[0058] Alternatively, the heat sink assembly 112 includes a second heat sink 112b. The second heat sink 112b is fixedly disposed on the chamfered surface 121 of the battery cell 12, and multiple second heat sinks 112b are spaced apart along the extending direction of the first heat pipe 111. The arrangement of the second heat sink 112b can also increase the heat exchange area between the first heat pipe 111 and the battery cell 12, thereby improving the heat exchange efficiency between them.

[0059] refer to Figure 4 , Figure 5 Alternatively, the heat sink assembly 112 may include multiple first heat sinks 112a and multiple second heat sinks 112b. The first heat sinks 112a are fixedly mounted on the first heat sink 111, and multiple such sinks are spaced apart along the extension direction of the first heat sink 111. In other words, the first heat sinks 112a and the first heat sink 111 form a finned tube structure, where the first heat sinks 112a are the fins in the finned tube structure, and the first heat sink 111 is the tube body used for circulating refrigerant. The second heat sinks 112b are fixedly mounted on the chamfered surface 121 of the battery cell 12, and multiple second heat sinks 112b are spaced apart along the extension direction of the first heat sink 111. The multiple first heat sinks 112a and multiple second heat sinks 112b are arranged alternately along the extension direction of the first heat sink 111.

[0060] The arrangement of the first heat sink 112a and the second heat sink 112b can increase the heat exchange area between the first heat pipe 111 and the battery cell 12, and improve the heat exchange efficiency between the first heat pipe 111 and the battery cell 12, so that the heat on the battery cell 12 can be carried away by the refrigerant in the first heat pipe 111 in time, preventing the battery cell 12 from overheating during operation and avoiding dangerous accidents such as fire or explosion of the battery cell 12.

[0061] When the heat sink assembly 112 includes a second heat sink 112b, the second heat sink 112b may be provided with a clearance notch 1121. The clearance notch 1121 of the second heat sink 112b located on at least two adjacent cells 12 encloses a clearance space. This clearance space allows the first heat dissipation pipe 111 to pass through, so as to avoid interference between the second heat sink 112b and the first heat dissipation pipe 111, thereby allowing the cells 12 to be arranged more closely without being affected by the second heat sink 112b. This can further reduce the overall space occupied by the heat dissipation structure 11 and the cells 12, thereby saving space in the casing and allowing more cells 12 to be arranged in the same volume, so as to significantly improve the energy density in the battery pack 1.

[0062] When the heat sink assembly 112 includes both a first heat sink 112a and a second heat sink 112b, the spacing between two adjacent first heat sinks 112a in the extension direction of the first heat pipe 111 is equal, and the spacing between two adjacent second heat sinks 112b in the extension direction of the first heat pipe 111 is also equal. In other words, the first heat sinks 112a and the second heat sinks 112b are arranged at equal intervals in the extension direction of the first heat pipe 111. This helps to ensure that the spacing between adjacent first heat sinks 112a and adjacent second heat sinks 112b remains equal. When the battery cell 12 is transferred from the second heat sink 112b to the first heat sink 112a, the heat dissipation efficiency and effect between any pair of adjacent first heat sinks 112a and second heat sinks 112b are the same. This helps to ensure uniform heat dissipation of the battery cell 12 and prevent poor heat dissipation in some areas of the battery cell 12.

[0063] refer to Figure 1 , Figure 2 , Figure 3The heat dissipation structure 11 includes a second heat dissipation pipe 113 and a third heat dissipation pipe 114. The first heat dissipation pipe 111 has a first end and a second end along its extension direction. The second heat dissipation pipe 113 is connected to the first end of the first heat dissipation pipe 111, and the third heat dissipation pipe 114 is connected to the second end of the first heat dissipation pipe 111. The second heat dissipation pipe 113 and the third heat dissipation pipe 114 can respectively contact two opposite sides of the battery cell 12 arranged along the extension direction of the first heat dissipation pipe 111. The first heat dissipation pipes 111 are distributed among the battery cells 12, the second heat dissipation pipe 113 connects the first end of the first heat dissipation pipe 111, and the third heat dissipation pipe 114 connects the second end of the first heat dissipation pipe 111, so that the first heat dissipation pipe 111, the second heat dissipation pipe 113, and the third heat dissipation pipe 114 form a frame structure covering all the battery cells 12. This can significantly improve the heat exchange area and heat exchange efficiency between the heat dissipation structure 11 and the battery cells 12.

[0064] refer to Figure 1 , Figure 2 , Figure 3 Based on this, the casing of battery pack 1 can be composed of multiple heat dissipation plates 14. Alternatively, battery pack 1 may also include heat dissipation plates 14, which are disposed within the casing. The heat dissipation plates 14 are bonded to the battery cells 12 with thermally conductive adhesive and fixedly connected to the first heat dissipation pipe 111, the second heat dissipation pipe 113, and the third heat dissipation pipe 114 by welding, thereby increasing the heat dissipation area of ​​battery pack 1. The second heat dissipation pipe 113 has an outlet 1131 for refrigerant outflow, and the third heat dissipation pipe 114 has an inlet 1141 for refrigerant inflow. The refrigerant flows from the lower-positioned third heat dissipation pipe 114 into the first heat dissipation pipe 111, then from the first heat dissipation pipe 111 into the second heat dissipation pipe 113, and finally outflows from the outlet 1131 in the second heat dissipation pipe 113. This ensures sufficient heat exchange between the refrigerant and the battery cells 12, preventing waste of refrigerant cooling capacity.

[0065] In the above configuration, the battery cells 12 of the battery pack 1 form a mounting cavity 13 by utilizing the chamfered corners 121 of the cells 12. When the first heat dissipation pipe 111 and the heat sink assembly 112 are arranged in the mounting cavity 13, this space can be effectively utilized. In this way, while meeting the heat dissipation requirements of the cells 12, the total space occupied by the cells 12 and the heat dissipation structure 11 can be avoided from increasing. This saves space inside the casing, allowing more cells 12 to be arranged in the casing of the same volume, thereby increasing the energy density inside the battery pack 1. Therefore, by using the above-mentioned battery pack 1, the battery life of the electrical device 2 can be improved without changing the volume of the battery pack 1. At the same time, the battery pack 1 uses the space between the chamfered corners 121 of two adjacent cells 12 and the casing, and the space between the chamfered corners 121 of the cells 12 and the corners of the casing to form the mounting cavity 13, increasing the space where the first heat dissipation pipe 111 can be arranged inside the battery pack 1. This helps to increase the heat exchange area between the battery cell 12 and the heat dissipation structure 11 inside the battery pack 1, thereby giving the battery pack 1 a better heat dissipation capacity.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0067] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or at least two of the features. In the description of this utility model, unless otherwise stated, "at least two" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0068] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "left", "right", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0069] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0070] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or at least two embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A battery pack, characterized by, The battery cell (12) is arranged in the box body; the battery cell (12) is in a prismatic structure and has side edges, and the battery cell (12) has chamfers (121) at two adjacent side edges; the battery cell (12) is arranged in an array and has the chamfers (121) of adjacent battery cells (12) surrounding an installation cavity (13), and / or the chamfers (121) of two adjacent battery cells (12) and the box body surround the installation cavity (13), and / or the chamfers (121) of the battery cell (12) and the corner position of the box body surround the installation cavity (13). The heat dissipation structure (11) comprises a first heat dissipation pipe (111) and a heat dissipation fin assembly (112); the first heat dissipation pipe (111) passes through and is arranged in the installation cavity (13), and the heat dissipation fin assembly (112) is arranged between the first heat dissipation pipe (111) and the hole wall of the installation cavity (13) and is arranged along the extension direction of the first heat dissipation pipe (111). The heat dissipation fin assembly (112) comprises a first heat dissipation fin (112a); the first heat dissipation fin (112a) is fixedly arranged on the first heat dissipation pipe (111), and a plurality of first heat dissipation fins (112a) are arranged at intervals along the extension direction of the first heat dissipation pipe (111); the first heat dissipation fin (112a) is in contact with the inclined surface of the chamfer (121).

2. The battery pack of claim 1, wherein, The heat dissipation fin assembly (112) comprises a second heat dissipation fin (112b), the second heat dissipation fin (112b) is fixedly arranged on the inclined surface of the chamfer (121), and a plurality of second heat dissipation fins (112b) are arranged at intervals along the extension direction of the first heat dissipation pipe (111); the second heat dissipation fin (112b) is in contact with the first heat dissipation pipe (111).

3. The battery pack of claim 1, wherein, The heat dissipation fin assembly (112) comprises a plurality of first heat dissipation fins (112a) and a plurality of second heat dissipation fins (112b), a plurality of first heat dissipation fins (112a) are fixedly arranged at intervals on the first heat dissipation pipe (111), and a plurality of second heat dissipation fins (112b) are fixedly arranged at intervals on the inclined surface of the chamfer (121); the plurality of first heat dissipation fins (112a) and the plurality of second heat dissipation fins (112b) are alternately arranged along the extension direction of the first heat dissipation pipe (111).

4. The battery pack of claim 1, wherein, The second heat dissipation fin (112b) is provided with a avoiding gap (1121), and the avoiding gaps (1121) on at least two adjacent battery cells (12) surround an avoiding space for the first heat dissipation pipe (111) to pass through.

5. The battery pack of claim 3 or 4, wherein, The interval of two adjacent first heat dissipation fins (112a) in the extension direction of the first heat dissipation pipe (111) is equal, and the interval of two adjacent second heat dissipation fins (112b) in the extension direction of the first heat dissipation pipe (111) is equal.

6. The battery pack of claim 4, wherein, ​ 7. The battery pack of any one of claims 1-4, wherein, The heat dissipation structure (11) comprises a second heat dissipation pipe (113) and a third heat dissipation pipe (114); along the extension direction of the first heat dissipation pipe (111), the first heat dissipation pipe (111) has a first end and a second end, the second heat dissipation pipe (113) is in communication with the first end of the first heat dissipation pipe (111), and the third heat dissipation pipe (114) is in communication with the second end of the first heat dissipation pipe (111).

8. The battery pack of claim 7, wherein, The second heat dissipation pipe (113) is arranged above the third heat dissipation pipe (114), the second heat dissipation pipe (113) has an outlet (1131) for the refrigerant to flow out, and the third heat dissipation pipe (114) has an inlet (1141) for the refrigerant to flow in.

9. The battery pack of claim 7, wherein, The battery pack further comprises a heat dissipation plate (14), the electric core (12) has a side surface, a top surface and a bottom surface, the heat dissipation plate (14) is fixed on the side surface and the bottom surface of the electric core (12) and is fixedly connected with at least one of the first heat dissipation pipe (111), the second heat dissipation pipe (113) and the third heat dissipation pipe (114).

10. An electric device, characterized by The power utilization equipment comprises the battery pack (1) of any one of claims 1-9.

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