Battery pack and electric equipment

Abstract

The utility model provides a battery pack and electric equipment. Relates to the technical field of batteries. The battery pack comprises a box body, the box body comprises a first frame and a second frame, and an included angle is formed between the extension direction of the first frame and the extension direction of the second frame. Part of the first frame is connected with the second frame, and the other part of the first frame is connected with the second frame through a welding piece. By connecting part of the first frame and the second frame, the number and complexity of welding procedures during connection of the first frame and the second frame are reduced. Therefore, less welding operation needs to be carried out in the production process, so that the production time is shortened, and the production efficiency is improved. The welding part is used for connecting the parts, which cannot be directly butted, of the first frame and the second frame, so that the flexibility in design and manufacturing is provided, and the production efficiency of the box body is improved.

Description

Technical Field

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

[0002] The battery pack housing is used to protect the battery modules.

[0003] In related technologies, due to the limitations of the vehicle frame's enveloping space, the battery pack housing's frame is often an irregularly shaped structure with corners. During the manufacturing process of the battery pack housing, multiple frames are positioned one by one using tooling, and the joints are then welded together.

[0004] However, existing battery pack housings suffer from low manufacturing efficiency. Utility Model Content

[0005] This application provides a battery pack and electrical device to solve the problem of low efficiency in the manufacture of the battery pack housing.

[0006] On one hand, embodiments of this application provide a battery pack, including:

[0007] The box body includes a first side frame and a second side frame, and there is an angle between the extending directions of the first side frame and the extending directions of the second side frame.

[0008] A portion of the first frame is connected to the second frame, and another portion of the first frame is connected to the second frame via a welded component.

[0009] In some embodiments of this application, the first border includes a first plate and a second plate that are connected to each other.

[0010] The first plate is connected to the second frame; the second plate is connected to the second frame via welded parts.

[0011] In some embodiments of this application, the second border includes a third plate and a fourth plate that are connected to each other.

[0012] The first plate and the third plate are integrally formed; the second plate is connected to the fourth plate through welded parts.

[0013] In some embodiments of this application, the second plate body includes a first plate segment, a second plate segment, and a third plate segment connected in sequence.

[0014] Along the first direction, the first plate segment and the third plate segment are arranged opposite to each other, and the first plate segment and the third plate segment are respectively connected to the first plate body.

[0015] Along the second direction, the second plate segment and the first plate body are arranged opposite each other; the second direction and the first direction intersect.

[0016] The first plate, the first plate segment, the second plate segment, and the third plate segment are connected end to end to form the first frame.

[0017] In some embodiments of this application, the fourth plate body includes a fourth plate segment, a fifth plate segment, and a sixth plate segment connected in sequence.

[0018] Along the first direction, the fourth plate segment and the sixth plate segment are arranged opposite to each other, and the fourth plate segment and the sixth plate segment are respectively connected to the third plate body.

[0019] Along the third direction, the fourth plate segment and the third plate body are set opposite each other; the third direction and the first direction intersect.

[0020] The third, fourth, fifth, and sixth panels are connected end to end to form the second frame.

[0021] In some embodiments of this application, the angle between the extension direction of the cross section of the first frame near the second frame and the extension direction of the first frame is an acute angle.

[0022] In some embodiments of this application, the angle between the extension direction of the cross section of the second frame near the first frame and the extension direction of the second frame is an acute angle.

[0023] In some embodiments of this application, the area of ​​the cross-section of the first frame near the second frame is equal to the area of ​​the cross-section of the second frame near the first frame.

[0024] In some embodiments of this application, the angle between the extension direction of the first border and the extension direction of the second border is A, where A satisfies: 135°≤A≤180°.

[0025] On the other hand, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0026] This application provides a battery pack and an electrical device. The battery pack includes a housing, which includes a first frame and a second frame. An angle exists between the extending directions of the first and second frames. A portion of the first frame is connected to the second frame, and another portion of the first frame is connected to the second frame via a welded component. By connecting a portion of the first frame to the second frame, the number and complexity of welding steps during the connection are reduced. This means fewer welding operations are required during production, thereby shortening production time and improving production efficiency. Using welded components to connect portions of the first and second frames that cannot be directly joined provides design and manufacturing flexibility and improves the production efficiency of the housing. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of this application when the first and second borders are not connected;

[0029] Figure 2 This is a schematic diagram of the structure of the battery pack after the first and second borders are connected, as provided in an embodiment of this application.

[0030] Explanation of reference numerals in the attached figures:

[0031] 100: First border; 110: First panel; 120: Second panel; 121: First panel segment; 122: Second panel segment; 123: Third panel segment;

[0032] 200: Second border; 210: Third panel; 220: Fourth panel;

[0033] 300: V-groove.

[0034] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0035] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0036] In related technologies, irregularly shaped box designs with corners are generally more complex than simple rectangular box designs. This complexity increases the difficulty of design and manufacturing, as each corner and bevel of the box requires precise machining and assembly.

[0037] Currently, the irregularly shaped box with corners is manufactured by positioning multiple completely disjointed individual frame structures one by one using tooling, and then connecting adjacent individual frame structures. A ring of welding is then performed at the connection point of adjacent frame structures to connect them.

[0038] Each frame structure needs to be individually manufactured to ensure precise dimensions and shape. This complexity increases the difficulty and time required for manufacturing.

[0039] Because each frame structure is completely disconnected, the assembly process requires multiple repetitive steps to connect each frame structure together. This multi-step process increases assembly time and complexity. When dealing with irregularly shaped and corner-shaped structures, ensuring precise alignment and fixation of all frame structures during assembly is a challenge, potentially leading to additional adjustment and correction steps.

[0040] A ring of welding is performed at the joints between adjacent frame structures to connect them. This requires a high level of welding skill and precise control to ensure weld quality and structural integrity. The welding process can cause thermal deformation and stress concentration in the material, necessitating additional processing steps to correct and release stress, further increasing the complexity of the process.

[0041] The individual machining, positioning, connection, and welding of each frame component increases the number of process steps. Each step requires time and resources, resulting in low overall manufacturing efficiency.

[0042] In summary, the current method for manufacturing irregularly shaped boxes with corners suffers from low production efficiency.

[0043] Therefore, this application provides a battery pack and an electrical device. The battery pack includes a housing, which includes a first frame and a second frame. An angle exists between the extending directions of the first and second frames. A portion of the first frame is connected to the second frame, and another portion of the first frame is connected to the second frame via a welded component. By directly connecting a portion of the first frame to the second frame, the number and complexity of welding processes when connecting the first and second frames are reduced. This means fewer welding operations are required during production, thereby shortening production time and improving production efficiency. Using welded components to connect portions of the first and second frames that cannot be directly joined provides design and manufacturing flexibility and improves the production efficiency of the housing.

[0044] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0045] On the one hand, refer to Figure 1 and Figure 2 As shown, this application embodiment provides a battery pack, including:

[0046] The box body includes a first side frame 100 and a second side frame 200, and there is an angle between the extending direction of the first side frame 100 and the extending direction of the second side frame 200.

[0047] A portion of the first frame 100 is connected to the second frame 200, and another portion of the first frame 100 is connected to the second frame 200 via a welded component.

[0048] For example, when the battery pack housing is an irregularly shaped structure with corners, such as when the connection between the first side frame 100 and the second side frame 200 is a corner structure, the extension direction of the first side frame 100 and the extension direction of the second side frame 200 intersect to form a corner structure at the connection between the first side frame 100 and the second side frame 200.

[0049] In this configuration, a portion of the first frame 100 is connected to the second frame 200, and another portion of the first frame 100 is connected to the second frame 200 via a welded component.

[0050] In this way, the direct connection between the first frame 100 and the second frame 200 reduces the number and complexity of welding processes. This connection method is generally more robust and reliable because it does not depend on the quality of the weld. By reducing the number of welding points, potential errors and defects during the welding process are reduced, thereby improving production efficiency and product quality.

[0051] The other part of the first frame 100 and the part of the second frame 200 connected by a welded component are used to form a corner structure. The welded component is used to connect the parts of the first frame 100 and the second frame 200 that cannot be directly connected.

[0052] Welded components offer design and manufacturing flexibility, allowing for more complex and diverse structural designs. By using welded components, irregular designs can be more easily realized, adapting to different application requirements.

[0053] By directly connecting the first frame 100 to the second frame 200, the number and complexity of welding processes are reduced. This means fewer welding operations are required during production, thus shortening production time and improving efficiency. Reducing the number of welding points also reduces potential errors and defects during the welding process. This not only improves the quality of the enclosure but also reduces the need for rework and repairs, thereby increasing overall production efficiency.

[0054] By using welded components to connect the parts of the first frame 100 and the second frame 200 that cannot be directly connected, design and manufacturing flexibility is provided, and the production efficiency of the enclosure is improved.

[0055] For example, refer to Figure 1As shown, when the first border 100 and the second border 200 do not form a corner structure, i.e., in their initial state, the first border 100 and the second border 200 are integrally molded parts. To form a corner structure on this integrally molded part, a V-groove 300 is provided. The V-groove 300 divides the integrally molded part into the first border 100 and the second border 200.

[0056] When connecting the first frame 100 and the second frame 200 to form a corner structure, bending is performed at the V-groove 300 opening using a bending tool, and another part of the first frame 100 and the second frame 200 are connected by a welding component.

[0057] A bending knife is a tool used for processing sheet metal, typically used in bending machines, to bend sheet metal.

[0058] A bending die consists of an upper die (upper cutter) and a lower die (lower cutter). The upper die (upper cutter) is a wedge-shaped or other specifically shaped tool used to apply downward pressure. The shape of the upper die determines the bending angle and radius. The lower die (lower cutter) is a tool with grooves used to support the metal sheet. The shape of the lower die mates with the upper die to form the desired bending shape.

[0059] The working principle of the bending machine is as follows: A metal sheet, such as the first frame 100 and the second frame 200 mentioned in the embodiments of this application, is placed on the worktable of the bending machine and positioned in the groove of the lower die. The bending machine drives the upper die downwards via a hydraulic, mechanical, or electric system. The upper die applies pressure, causing the metal sheet to undergo plastic deformation in the groove of the lower die. Under the pressure of the upper die, the metal sheet bends along the groove line of the lower die. The bending angle and radius are determined by the shapes of the upper and lower dies and the applied pressure. Once the desired bending angle is reached, the upper die returns to its initial position, releasing the pressure. The metal sheet retains its new shape, completing the bending process.

[0060] Furthermore, in traditional enclosures, the first frame 100 and the second frame 200 are connected by a full weld around the perimeter. In this embodiment, another portion of the first frame 100 and the second frame 200 are connected by welded components. That is, in this embodiment, only partial welding is required, reducing the use of welding materials and welding time, thereby lowering production costs. Due to the reduced welding area, the heat-affected zone is also correspondingly smaller, reducing the risk of material deformation and performance changes. The partial welding process is relatively simple, easy to control and execute, and improves production efficiency.

[0061] The other part of the first frame 100 and the second frame 200 can be connected by welding rods.

[0062] The welding electrode melts during the welding process, fills the weld seam, and forms a welded part.

[0063] As one feasible implementation method, refer to Figure 2 As shown, the first frame 100 includes a first plate 110 and a second plate 120 that are connected to each other.

[0064] The first plate 110 is connected to the second frame 200; the second plate 120 is connected to the second frame 200 via a welded component.

[0065] For example, the first plate 110 is directly connected to the second frame 200. This direct connection reduces the number of welding steps, lowers production complexity, and improves the stability and reliability of the connection.

[0066] The second plate 120 is connected to the second frame 200 by a welded component. The use of a welded component provides design and manufacturing flexibility, allowing for complex structural designs when needed. While ensuring the connection strength between the first frame 100 and the second frame 200, the size of the corner between the first frame 100 and the second frame 200 can be flexibly adjusted.

[0067] As one possible implementation, the second plate 120 includes a first plate segment 121, a second plate segment 122, and a third plate segment 123 connected in sequence.

[0068] Along the first direction, the first plate segment 121 and the third plate segment 123 are arranged opposite to each other, and the first plate segment 121 and the third plate segment 123 are respectively connected to the first plate body 110.

[0069] Along the second direction, the second plate segment 122 and the first plate 110 are arranged opposite to each other; the second direction and the first direction intersect.

[0070] The first plate 110, the first plate segment 121, the second plate segment 122, and the third plate segment 123 are connected end to end to form the first frame 100.

[0071] Among them, the first direction reference Figure 2 The direction shown in the middle Z direction, the second direction is referenced Figure 2 The direction indicated by Y in the middle. The second direction is the direction from the first plate 110 to the second plate segment 122.

[0072] For example, along the first direction, the first plate segment 121 and the third plate segment 123 are arranged opposite to each other and are respectively connected to the first plate body 110. This arrangement forms a closed structure, increasing the overall strength of the first frame 100.

[0073] Along the second direction, the second plate segment 122 is positioned opposite to the first plate 110. The second direction intersects the first direction, and this intersecting arrangement provides additional structural support and stability.

[0074] The first plate 110, the first plate segment 121, the second plate segment 122, and the third plate segment 123 are connected end to end in sequence to form the first frame 100. This surrounding structure ensures the integrity and strength of the first frame 100.

[0075] By setting the first frame 100 as a first plate 110, a first plate segment 121, a second plate segment 122 and a third plate segment 123 connected end to end in sequence, the precise arrangement and connection of multiple plate segments form a stable frame, and the first frame 100 can withstand external pressure and internal load.

[0076] As one possible implementation, the second frame 200 includes a third plate 210 and a fourth plate 220 that are interconnected.

[0077] The first plate 110 and the third plate 210 are integrally formed parts; the second plate 120 is connected to the fourth plate 220 by welding parts.

[0078] For example, the interconnected third plate 210 and fourth plate 220 provide the necessary support and structural integrity for the second frame 200.

[0079] The first plate 110 and the third plate 210 are integrally molded parts. This design reduces the number of connection points between the first frame 100 and the second frame 200, thereby improving the overall strength and stability of the structure at the connection between the first frame 100 and the second frame 200. Integral molded parts are typically manufactured through mold processing or other molding processes, ensuring high precision and consistency.

[0080] The second plate 120 is connected to the fourth plate 220 by welded components. The use of welded components provides flexibility to allow for the formation of complex structures within the enclosure.

[0081] By designing the first plate 110 and the third plate 210 as a single molded part, the number of connection points between the first frame 100 and the second frame 200 is reduced, thereby lowering assembly complexity and the risk of potential connection failures. The single-molded design improves the structural strength and durability of the connection between the first frame 100 and the second frame 200, eliminating weak points in traditional connection methods.

[0082] By using welded components to connect the first frame 100 and the second frame 200, the use of welded components allows the housing to be designed and adjusted to suit different application needs and structural requirements.

[0083] As one possible implementation, the fourth plate 220 includes a fourth plate segment, a fifth plate segment, and a sixth plate segment connected in sequence.

[0084] Along the first direction, the fourth plate segment and the sixth plate segment are arranged opposite to each other, and the fourth plate segment and the sixth plate segment are respectively connected to the third plate body 210.

[0085] Along the third direction, the fourth plate segment and the third plate body 210 are positioned opposite each other; the third direction intersects with the first direction. The third direction is the direction from the fourth plate segment to the third plate body 210.

[0086] The third plate 210, the fourth plate segment, the fifth plate segment, and the sixth plate segment are connected end to end to form the second frame 200. The third direction is the direction from the fourth plate segment to the third plate.

[0087] For example, along the first direction, the fourth and sixth plate segments are arranged opposite to each other and are respectively connected to the third plate 210. This arrangement forms a closed structure, increasing the overall strength of the second frame 200.

[0088] Along the third direction, the fourth plate segment is positioned opposite the third plate 210. The third direction intersects with the first direction, and this intersecting arrangement provides additional structural support and stability.

[0089] The third plate 210, the fourth plate segment, the fifth plate segment, and the sixth plate segment are connected end to end in sequence to form the second frame 200. This surrounding structure ensures the integrity and strength of the second frame 200.

[0090] By setting the second frame 200 as a third plate 210, a fourth plate segment, a fifth plate segment, and a sixth plate segment connected end to end in sequence, the precise arrangement and connection of multiple plate segments form a stable frame, and the second frame 200 can withstand external pressure and internal load.

[0091] As one feasible implementation, the angle between the extension direction of the cross section of the first frame 100 near the second frame 200 and the extension direction of the first frame 100 is an acute angle.

[0092] For example, by setting the extension direction of the first frame 100 near the cross-section of the second frame 200 to an acute angle with the extension direction of the first frame 100, this acute angle design allows the first frame 100 and the second frame 200 to fit more tightly when they are joined, reducing the gap at the connection. This tight fit helps improve the stability and integrity of the overall structure. The tight connection between the first frame 100 and the second frame 200 helps improve sealing performance, preventing dust, moisture, or other external factors from entering the interior.

[0093] Sharp-angle designs typically increase the contact area between the first frame 100 and the second frame 200, thereby improving the strength of the connection between the first frame 100 and the second frame 200.

[0094] As one feasible implementation, the angle between the extension direction of the cross section of the second frame 200 on the side closer to the first frame 100 and the extension direction of the second frame 200 is an acute angle.

[0095] For example, the sharp-angled design allows the first frame 100 and the second frame 200 to fit more tightly when they are joined, reducing gaps at the joint. This tight fit helps improve the stability and integrity of the overall structure. The tight connection between the first frame 100 and the second frame 200 helps improve sealing performance, preventing dust, moisture, or other external factors from entering the interior.

[0096] Sharp-angled designs typically increase the contact area between the borders, thereby improving the strength at the connection between the first border 100 and the second border 200.

[0097] As one feasible implementation, the area of ​​the cross-section of the first frame 100 near the second frame 200 is equal to the area of ​​the cross-section of the second frame 200 near the first frame 100.

[0098] For example, the area of ​​the cross-section of the first frame 100 near the second frame 200 is equal to the area of ​​the cross-section of the second frame 200 near the first frame 100. This design ensures symmetry and balance between the two frames at the connection point.

[0099] Equal cross-sectional area design provides structural symmetry, which helps achieve uniform stress distribution at frame joints, thereby improving the overall structural stability and durability. This design can achieve mechanical balance at frame joints, reducing deformation or damage that could result from asymmetrical stress distribution. Equal cross-sectional area design may simplify manufacturing and assembly processes, as identical cross-sectional dimensions can utilize the same machining and assembly techniques.

[0100] As one feasible implementation, the angle between the extension direction of the first border 100 and the extension direction of the second border 200 is A, where A satisfies: 135°≤A≤180°.

[0101] For example, the included angle between the extending directions of the first frame 100 and the second frame 200 is designed to be between 135 degrees and 180 degrees. This means that the connection between the first frame 100 and the second frame 200 forms an obtuse angle, which helps to create a wider structural layout for the enclosure. By setting the angle at the connection between the first frame 100 and the second frame 200 to 135°-180°, this angle allows for greater utilization of internal space, making it suitable for applications that need to accommodate larger components or multiple battery cells.

[0102] The obtuse angle design at the junction of the first frame 100 and the second frame 200 helps to form a more stable structure, because the larger angle can provide better support and a more uniform stress distribution.

[0103] The larger included angle provides greater design flexibility, allowing for more complex geometries and functional integration between the first border 100 and the second border 200.

[0104] When the angle between the extending directions of the first frame 100 and the second frame 200 is between 135° and 180°, a larger angle generally means better structural stability because it provides a wider support surface, reduces stress concentration, and disperses the effects of external forces. A larger angle allows for more internal space, which is highly advantageous for designs that need to accommodate larger components or multiple units, such as battery packs. A larger angle helps to distribute stress more evenly, reducing localized stress concentration, thereby improving the structure's durability and lifespan. A larger angle provides greater design flexibility, allowing for more complex geometries and functional integration between the frames. Larger angles generally make assembly and maintenance easier because there is more space for manipulation.

[0105] When the angle between the extending directions of the first frame 100 and the second frame 200 is less than 135°, a smaller angle may lead to reduced structural stability because a smaller support surface may not effectively distribute external forces, increasing the risk of structural deformation. A smaller angle limits the utilization of internal space and may not be suitable for designs that need to accommodate larger components or multiple units. A smaller angle may cause stress concentration at corners or connection points, increasing the risk of material fatigue and damage. A smaller angle may limit design flexibility, making it difficult to achieve complex geometries and functional integration.

[0106] Therefore, in this embodiment of the application, the angle between the extension direction of the first border 100 and the extension direction of the second border 200 is A, and A satisfies: 135°≤A≤180°.

[0107] On the other hand, embodiments of this application provide an electrical device including the aforementioned battery pack.

[0108] It is understood that since the electrical equipment of this application adopts the technical solution of the battery pack of the above embodiments, it has at least the beneficial effects brought about by the technical solution of the above embodiments, which will not be described in detail here.

[0109] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0110] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery pack, characterized in that, include: The box body includes a first side frame (100) and a second side frame (200), and there is an angle between the extending direction of the first side frame (100) and the extending direction of the second side frame (200); A portion of the first frame (100) is connected to the second frame (200), and another portion of the first frame (100) is connected to the second frame (200) by a welded component.

2. The battery pack according to claim 1, characterized in that, The first frame (100) includes a first plate (110) and a second plate (120) that are connected to each other; The first plate (110) and the second frame (200) are connected; the second plate (120) is connected to the second frame (200) through the welded parts.

3. The battery pack according to claim 2, characterized in that, The second frame (200) includes a third plate (210) and a fourth plate (220) that are connected to each other; The first plate (110) and the third plate (210) are integrally formed parts; the second plate (120) is connected to the fourth plate (220) through the welded parts.

4. The battery pack according to claim 3, characterized in that, The second plate (120) includes a first plate segment (121), a second plate segment (122), and a third plate segment (123) connected in sequence; Along the first direction, the first plate segment (121) and the third plate segment (123) are arranged opposite to each other, and the first plate segment (121) and the third plate segment (123) are respectively connected to the first plate body (110); Along the second direction, the second plate segment (122) and the first plate body (110) are arranged opposite to each other; the second direction and the first direction intersect. The first plate (110), the first plate segment (121), the second plate segment (122), and the third plate segment (123) are connected end to end to form the first frame (100).

5. The battery pack according to claim 4, characterized in that, The fourth plate (220) includes a fourth plate segment, a fifth plate segment, and a sixth plate segment connected in sequence; Along the first direction, the fourth plate segment and the sixth plate segment are arranged opposite to each other, and the fourth plate segment and the sixth plate segment are respectively connected to the third plate body (210); Along a third direction, the fourth plate segment and the third plate body (210) are arranged opposite to each other; the third direction intersects the first direction; The third plate (210), the fourth plate segment, the fifth plate segment, and the sixth plate segment are connected end to end to form the second frame (200).

6. The battery pack according to any one of claims 1-5, characterized in that, The angle between the extension direction of the cross section of the first frame (100) near the second frame (200) and the extension direction of the first frame (100) is an acute angle.

7. The battery pack according to any one of claims 1-5, characterized in that, The angle between the extension direction of the cross section of the second frame (200) near the first frame (100) and the extension direction of the second frame (200) is an acute angle.

8. The battery pack according to any one of claims 1-5, characterized in that, The area of ​​the cross section of the first border (100) near the second border (200) is equal to the area of ​​the cross section of the second border (200) near the first border (100).

9. The battery pack according to any one of claims 1-5, characterized in that, The angle between the extension direction of the first border (100) and the extension direction of the second border (200) is A, and A satisfies: 135°≤A≤180°.

10. An electrical appliance, characterized in that, The battery pack includes any one of claims 1-9.

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