Battery pack and electric device

Abstract

A battery pack (100) and an electric device. The battery pack (100) comprises: a plurality of batteries (1); a housing assembly (2), in a cavity of which the plurality of batteries (1) are sequentially arranged in a first direction; and a pressing plate (3), which is arranged in the cavity and connected to the housing assembly (2), and extends in the first direction and is arranged above the plurality of batteries (1) to constrain the plurality of batteries (1), wherein the size of the pressing plate (3) in a second direction is not greater than the size of the batteries (1) in the second direction, and the second direction is perpendicular to the first direction.

Description

Battery packs and power devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202311248429.8, entitled “Battery Pack and Electrical Device,” filed by BYD Co., Ltd. on September 25, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a battery pack and an electrical device. Background Art

[0004] In the related art, a pressure plate is provided in the battery pack, and the battery is limited and constrained by completely covering the pressure plate, which results in a large amount of structural adhesive being applied between the pressure plate and the battery to ensure the connection effect between the pressure plate and the battery. A large amount of glue is used in the battery pack; in addition, the size of the pressure plate is large, resulting in a large volume and weight of the pressure plate, which increases production costs.

[0005] Summary of the Invention

[0006] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] One purpose of the present application is to provide a battery pack in which a pressure plate can constrain the battery cells to meet the lightweight design of the battery pack.

[0008] According to the battery pack of the embodiment of the first aspect of the present application, it includes: a plurality of batteries; a shell assembly, and the plurality of batteries are arranged in sequence along a first direction in the cavity of the shell assembly; a pressure plate, the pressure plate is arranged in the cavity and connected to the shell assembly, and the pressure plate extends along the first direction and is arranged above the plurality of batteries to constrain the plurality of batteries; wherein the dimension of the pressure plate in the second direction is not larger than the dimension of the battery in the second direction, and the second direction is arranged perpendicular to the first direction.

[0009] In this application, a pressure plate is connected to the housing assembly and positioned above the multiple batteries to constrain them. Furthermore, the pressure plate is positioned only partially over the multiple batteries, thereby ensuring the effective restraint of the multiple batteries while reducing the size and weight of the pressure plate, thereby achieving a lightweight battery pack design. Furthermore, the reduced size of the pressure plate can reduce its production cost.

[0010] An electrical device according to an embodiment of the second aspect of the present application includes the above-mentioned battery pack.

[0011] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is an exploded view of a battery pack according to an embodiment of the present application;

[0013] FIG2 is a schematic diagram of the cooperation between the tray and the mounting block according to an embodiment of the present application;

[0014] FIG3 is a schematic diagram of the cooperation between the pressing plate and the insulating layer according to an embodiment of the present application;

[0015] FIG4 is an exploded view of a pressing plate and an insulating layer according to an embodiment of the present application;

[0016] FIG5 is a partially enlarged view of the circled portion A in FIG4 .

[0017] FIG6 is a top view of a battery pack according to an embodiment of the present application;

[0018] FIG7 is a schematic diagram of the cooperation between the positioning portion and the positioning cooperation portion according to an embodiment of the present application;

[0019] FIG8 is a schematic diagram of an anti-error protrusion according to an embodiment of the present application;

[0020] FIG9 is a second exploded view of the battery pack according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0022] A battery pack 100 according to an embodiment of the present application is described below with reference to FIG. 1 to FIG. 9 .

[0023] The battery pack 100 according to an embodiment of the present application includes: a case assembly 2 , a pressing plate 3 and a plurality of batteries 1 .

[0024] The shell assembly is provided with a cavity, and multiple batteries 1 are arranged in sequence along a first direction in the cavity. The pressure plate 3 is provided in the cavity and connected to the shell assembly 2. The pressure plate 3 extends along the first direction and is provided above the multiple batteries 1 to constrain the multiple batteries 1, improve the stability of the batteries 1 in the cavity, and improve the reliability and safety of the battery pack 100.

[0025] The battery pack 100 is an energy storage device that contains multiple batteries 1, which are electrically connected to each other. When placed within a cavity, these batteries 1 (i.e., the batteries 1) must be secured to ensure reliable connections between the batteries 1 and between the batteries 1 and the electrical components within the battery pack 100. The pressure plate 3 in this application is positioned above the batteries 1 to provide a vertical restraint on one side of the battery 1, enhancing the stability and reliability of the battery 1 within the cavity.

[0026] Referring to Figure 6 , multiple batteries 1 are arranged sequentially in a first direction, with a pressure plate 3 disposed above the batteries 1. The pressure plate 3 also extends along the first direction and is connected to the housing assembly 2. The dimension of the pressure plate 3 in a second direction is no greater than the dimension of the batteries 1 in the second direction, and the second direction is perpendicular to the first direction.

[0027] The first direction and the second direction correspond to the length direction and the width direction of the pressing plate 3 and the length direction and the width direction of the battery 1 respectively. The specific correspondence is related to the size of the pressing plate 3 and the size of the battery 1.

[0028] In conjunction with Figures 1 and 6 , in this application, the "first direction" corresponds to the length direction of the pressing plate 3, and the "second direction" corresponds to the width direction of the pressing plate 3; the battery 1 is constructed as a rectangular parallelepiped, and the "first direction" corresponds to the width direction of the battery 1 (which is also the arrangement direction of multiple batteries 1), and the "second direction" corresponds to the length direction of the battery 1. In other words, the width direction of the pressing plate 3 corresponds to the length direction of the battery 1, and the width dimension of the pressing plate 3 is no greater than the length dimension of the battery 1, so that the pressing plate 3 can fully correspond to part of the battery 1, thereby effectively restraining the battery 1.

[0029] When the battery pack 100 is applied to an electrical device (such as a vehicle), the "first direction" can be one of the X-direction, Y-direction, and Z-direction of the vehicle, and the "second direction" can be one of the other two of the X-direction, Y-direction, and Z-direction of the vehicle, such as: the first direction is the X-direction, and the second direction is the Y-direction; the first direction is the Y-direction, and the second direction is the X-direction.

[0030] In the prior art, a pressure plate 3 is provided in the battery pack 100 to completely cover the battery 1 and constrain the battery 1. This requires a large amount of structural adhesive to be applied between the pressure plate 3 and the battery 1 to ensure a secure connection between the pressure plate 3 and the battery 1. The large amount of adhesive used in the battery pack 100 results in a heavy weight of the battery pack 100, which does not meet the lightweight design requirements. Furthermore, the large size of the pressure plate 3 increases its volume and weight, increasing production costs.

[0031] In the present application, the pressure plate 3 is connected to the housing assembly 2 and arranged above the multiple battery cells 1 to constrain the battery cells 1. Furthermore, the pressure plate 3 is only partially located corresponding to the multiple battery cells 1. This ensures that the multiple battery cells 1 are constrained while reducing the size and weight of the pressure plate 3, thereby achieving a lightweight design for the battery pack 100. Furthermore, the reduced size of the pressure plate 3 can reduce the production cost of the pressure plate 3.

[0032] As shown in FIG. 2 , in some embodiments of the present application, the shell assembly 2 includes: a tray 21 and a mounting block 22 . The tray 21 is used to accommodate the battery 1 . The mounting block 22 is installed on the tray 21 and is used to install the pressure plate 3 .

[0033] The mounting block 22 serves as a mounting support for the pressure plate 3, eliminating the need for a mounting structure on the tray 21 that mates with the pressure plate 3, thereby reducing the difficulty in developing and designing the tray 21. Referring to Figure 2 , the mounting block 22 can be arranged on the inner wall of the tray 21 and fixed to the tray 21 by welding or other connection methods. The pressure plate 3 is disposed above the mounting block 22 to support the pressure plate 3, thereby reducing the difficulty in connecting and mating the pressure plate 3 and the mounting block 22.

[0034] The pressure plate 3 is fixedly connected to the mounting block 22 to fix the position of the pressure plate 3 in the battery pack 100 and ensure that the pressure plate 3 has a restraining effect on the battery 1. The pressure plate 3 and the mounting block 22 can be connected in various ways, such as fastening the pressure plate 3 to the mounting block 22 with connectors (such as bolts, screws, rivets, etc.), or fastening the pressure plate 3 to the mounting block 22 with a snap-fit ​​structure (such as a hook), etc., which are not specifically limited here.

[0035] In some optional embodiments of the present application, a card slot is provided on the side beam 212 of the tray 21 , and the card slot is engaged with the pressure plate 3 to fix the pressure plate 3 to the tray 21 .

[0036] In some optional embodiments of the present application, the tray 21 and the pressing plate 3 abut against each other and have an interference fit to fix the pressing plate 3 in the tray 21 .

[0037] Referring to Figure 1, taking fixation through a connecting piece as an example, a through hole is formed on the pressure plate 3 at the area corresponding to the mounting block 22, and a threaded matching hole that is threadedly matched with the connecting piece is formed on the mounting block 22. The pressure plate 3 can be fixedly connected to the mounting block 22 by threading the connecting piece with the threaded matching hole. The connection method is simple and reliable.

[0038] As shown in Figure 2, in some embodiments of the present application, the shell assembly 2 also includes a partition beam 4, which is arranged in the tray 21 and extends along the first direction. The partition beam 4 is used to separate the cavity of the shell assembly 2 to form two accommodating cavities 211 for arranging multiple batteries.

[0039] 2 , the two accommodating cavities 211 are arranged along the second direction, and the multiple batteries 1 in each accommodating cavity 211 are arranged in sequence along the first direction.

[0040] The cavity is divided by a partition beam 4, forming two adjacent accommodating cavities 211 arranged along the second direction. Multiple batteries 1 are arranged in each accommodating cavity 211, and the multiple batteries 1 are arranged along the first direction within the accommodating cavity 211. The provision of the partition beam 4 can enhance the structural strength of the shell assembly 2 and can also divide the cavity into multiple sub-cavities, thereby isolating the batteries 1 within the cavity.

[0041] To improve the energy storage performance of the battery pack 100, the number of batteries 1 can be increased if the battery pack 100 has the same number of batteries 1. However, due to the size of the battery pack 100, the number of batteries 1 that can be arranged in the first direction is limited. Therefore, multiple groups of batteries 1 arranged sequentially in the first direction can be provided to improve the energy storage performance of the battery pack 100 while meeting the design requirements of the battery pack 100 size. The provision of the partition beam 4 in this application can divide the space within the battery pack 100 and enhance the structural strength of the housing assembly 2.

[0042] In some embodiments of the present application, a plurality of mounting blocks 22 are provided in each accommodating cavity 211, and the mounting blocks 22 are provided on two oppositely arranged side beams 212 of the tray 21 in the first direction, and at least one of the plurality of mounting blocks 22 is provided with a positioning portion 221, and the pressure plate 3 is provided with a positioning matching portion 301, and the positioning matching portion 301 is positioned and matched with the positioning portion 221 to position and match the pressure plate 3 with the mounting block 22, thereby assisting in the assembly of the pressure plate 3.

[0043] The pressure plate 3 is assembled and fixed by the mounting block 22. The mounting block 22 can support the mounting plate and form a mounting point for the pressure plate 3. The pressure plate 3 is constructed as a plate-like structure. To meet the lightweight design, the volume of the mounting block 22 can be reduced. By providing multiple mounting blocks 22, the pressure plate 3 is supported.

[0044] 2 and 3 , the pressure plate 3 is constructed as a rectangular plate. Four mounting blocks 22 are disposed within each accommodating cavity 211. These four mounting blocks 22 are positioned adjacent to the four corners of the pressure plate 3 to enhance the support and securement provided by the mounting blocks 22 to the pressure plate 3. At least one of the four mounting blocks 22 is provided with a positioning portion 221, and a positioning mating portion 301 is provided on the pressure plate 3. The positioning portion 221 engages with the positioning mating portion 301 to position the pressure plate 3 and the mounting blocks 22, thereby simplifying assembly of the pressure plate 3.

[0045] Among them, the number of positioning portions 221 is the same as the number of positioning matching portions 301, that is, when one of the four mounting blocks 22 is provided with a positioning portion 221, correspondingly, a positioning matching portion 301 is provided on the pressure plate 3; when two of the four mounting blocks 22 are provided with positioning portions 221, correspondingly, two positioning matching portions 301 corresponding to the two mounting blocks 22 provided with the positioning portions 221 are provided on the pressure plate 3.

[0046] In some embodiments of the present application, one of the positioning portion 221 and the positioning and matching portion 301 is configured as a positioning protrusion, and the other of the positioning portion 221 and the positioning and matching portion 301 is configured as a positioning groove. When the positioning protrusion extends into the positioning groove, the pressure plate 3 and the mounting block 22 are positioned and matched, and a mistake-proofing effect can be achieved.

[0047] 2 and 3 , the positioning portion 221 is configured as a positioning groove, and the positioning mating portion 301 is configured as a positioning protrusion. When the pressing plate 3 is placed on the mounting seat, the positioning protrusion is located in the positioning groove, positioning and mating the pressing plate 3 with the mounting block 22. If the pressing plate 3 is reversed, the positioning protrusion will not fit in the positioning groove and will abut against the mounting block 22 where the positioning groove is not provided. At this time, the top corner of the pressing plate 3 where the positioning protrusion is provided will tilt up, providing a warning to the operator and thus preventing errors.

[0048] If positioning portions 221 are provided on all four positioning blocks, the shapes of the positioning protrusions and positioning grooves can be designed to meet positioning requirements. The shapes and sizes of the positioning protrusions and positioning grooves are not specifically limited herein.

[0049] As shown in Figures 3 and 8 , in some embodiments of the present application, at least one of the two pressure plates 3 is provided with an anti-error protrusion 33. The anti-error protrusion 33 is formed on the side of the pressure plate 3 facing away from the battery 1 and protrudes upward. During the assembly process of the pressure plate 3, the position of the anti-error protrusion 33 can be observed to determine whether the pressure plate 3 is anti-error, thereby achieving a good anti-error effect and helping to improve the assembly efficiency of the pressure plate 3.

[0050] As shown in Figure 3, in some embodiments of the present application, there are two pressure plates 3, and the two pressure plates 3 are respectively arranged corresponding to the multiple batteries 1 in the two accommodating cavities 211, and one of the two pressure plates 3 is provided with a first mounting portion 302, and the partition beam 4 is provided with a second mounting portion 41. The first mounting portion 302 and the second mounting portion 41 are spaced apart in the second direction and are used to install the distribution box 6. The distribution box 6 in the present application is installed and fixed by the partition beam 4 and the pressure plate 3, making full use of the components in the battery pack 100.

[0051] The battery pack 100 is provided with a distribution box 6. In this application, the distribution box 6 is arranged above the pressure plate 3 and secured by cooperating with the first mounting portion 302 and the second mounting portion 41. Placing the distribution box 6 in the upper area of ​​the battery pack 100 can fully utilize the spare space of the entire vehicle (the electrical devices used by the battery pack 100), ensuring the arrangement of the battery cells on the tray 21. The saved space can be used to accommodate more batteries 1, thereby improving the battery pack 100's battery life.

[0052] As shown in Figure 3, in an embodiment of the present application, the first mounting portion 302 is constructed as a mounting column, which is provided with a threaded hole. The mounting column is plugged into the shell of the distribution box 6 and threadedly engaged with the threaded connector to connect the shell to the pressure plate 3.

[0053] The distribution box 6 is formed with a mounting structure (e.g., a slot or hole) that cooperates with the mounting post, and a threaded connector can pass through the mounting structure and threadedly cooperate with the threaded hole to securely connect the distribution box 6 to the pressure plate 3. The mounting post can be positioned and cooperated with the housing of the distribution box 6 during assembly, reducing the difficulty of assembling the distribution box 6 and the pressure plate 3.

[0054] In some embodiments of the present application, the second mounting portion 41 is configured as a mounting seat that protrudes from the upper surface of the partition beam 4 toward one side of the distribution box 6 and is connected to the distribution box 6. The mounting seat can support the distribution box 6 and be fixedly connected to the distribution box 6. A connecting structure (e.g., a threaded hole, etc.) can be formed on the mounting seat.

[0055] Thus, the distribution box 6 can be assembled through the first mounting portion 302 and the second mounting portion 41 , and the distribution box 6 can be arranged in the area above the battery 1 .

[0056] As shown in Figure 9, in some embodiments of the present application, the shell assembly 2 also includes an upper cover 23, which is snap-fitted with the tray 21 to define a cavity, and a raised portion 231 is formed on the upper cover 23, and the raised portion 231 is arranged corresponding to the distribution box 6 to form a space for arranging the distribution box 6.

[0057] In some embodiments of the present application, in the projection of the bottom surface of the housing assembly 2 (i.e., the projection in the vertical direction), the projected area of ​​the multiple batteries 1 is S1, and the overlapping area of ​​the projection of the pressure plate 3 on the bottom surface of the housing assembly 2 and the projection of the multiple batteries 1 on the ground surface of the housing assembly 2 is S2, and the relationship is satisfied: 0.6S1≤S2<S1. Wherein, S2 is the overlapping area of ​​the pressure plate 3 and the multiple batteries 1, and the pressure plate 3 and the batteries 1 are arranged in a partially corresponding manner.

[0058] S2=0.6S1, so that the size and weight of the pressing plate 3 can be fully reduced while ensuring the restraining effect of the pressing plate 3 on the battery 1, meeting the lightweight design requirements.

[0059] In some embodiments of the present application, in the projection of the bottom surface of the shell assembly 2 , the pressing plate 3 has a first symmetry axis extending along the first direction, and the first symmetry axis coincides with the second symmetry axis of the plurality of batteries 1 extending along the first direction.

[0060] In the projection of the bottom surface of the housing assembly 2, the pressure plate 3 is rectangular, with two symmetry axes extending along a first direction and a second direction, respectively. The first symmetry axis is the one extending along the first direction. Multiple batteries have second symmetry axes extending along the first direction, and the first symmetry axis coincides with the second symmetry axes of the multiple batteries 1 arranged along the first direction. This ensures that the restraining force of the pressure plate 3 on the multiple batteries 1 is evenly distributed.

[0061] The projected shape of the pressing plate 3 is not limited to a rectangle, and may also be an isosceles trapezoid, an hourglass, or other axially symmetrical shape.

[0062] 6 , in some embodiments of the present application, in the second direction, the size ratio of the pressure plate 3 to the battery 1 is between 0.6 and 1, thereby fully corresponding the pressure plate 3 to the battery 1 and ensuring the restraining effect of the pressure plate 3 on the battery.

[0063] As shown in FIG6 , in the second direction, the size of the pressure plate 3 is the width of the pressure plate 3 , and the size of the battery 1 is the length of the battery 1 , that is, the ratio of the width of the pressure plate 3 to the length of the battery 1 is in the range of 0.6-1.

[0064] As shown in Figures 3 and 4, in some embodiments of the present application, the battery pack 100 also includes an insulating layer 5, which is arranged on the pressure plate 3, and at least part of the insulating layer 5 is arranged between the pressure plate 3 and the battery 1 to improve the insulation protection performance between the pressure plate 3 and the battery 1.

[0065] The pressure plate 3 is usually constructed of a metal pressure plate 3. The metal pressure plate 3 has high structural strength, but the metal pressure plate 3 is usually conductive, so insulation protection is required at the pressure plate 3. In this application, an insulating layer 5 is provided on the pressure plate 3 to improve the insulation performance of the pressure plate 3, prevent short circuits between the pressure plate 3 and the battery 1, and improve the safety of the battery pack 100.

[0066] 4 , in some embodiments of the present application, the insulating layer 5 includes: an insulating layer body 51 and an insulating edging 52 . The insulating layer body 51 is disposed on a surface of the pressure plate 3 opposite to the battery 1 , and at least a portion of the insulating layer body 51 is disposed in a corresponding area between the pressure plate 3 and the multiple batteries 1 to fully separate the pressure plate 3 from the multiple batteries 1 and enhance the insulation protection at the pressure plate 3 .

[0067] Referring to Figure 3 , the insulating edging 52 is connected to the insulating layer body 51 and is used to cover the edges of the pressing plate 3 on both sides in the second direction. The edges of the pressing plate 3 on both sides in the second direction fall within the vertical projection of the battery 1. Burrs may exist on the edges of the pressing plate 3, which may scratch the insulating material on the surface of the battery 1. By providing an insulating layer 5 to cover these burrs, the edges of the pressing plate 3 can be prevented from scratching the battery 1 and causing problems such as short circuits, thereby improving the safety of the battery pack 100.

[0068] As shown in Figure 6, in some embodiments of the present application, in the projection of the bottom surface of the shell assembly 2, the minimum distance between the pressure plate 3 and the edge of the battery on the same side of the second direction is L1, L2 and satisfies the relationship 70mm≤L1≤100mm, 70mm≤L2≤100mm.

[0069] The second direction includes two sides (a first side and a second side), so the distance between the edge of the pressing plate 3 and the battery 1 on the same side of the second direction includes two values ​​(i.e., L1 and L2). Referring to Figure 6, the minimum distance between the edge of the pressing plate 3 and the battery 1 on the first side and the edge of the battery 1 on the first side is L1, and satisfies the relationship 70mm≤L1≤100mm. The minimum distance between the edge of the pressing plate 3 on the second side and the edge of the battery 1 on the second side is L2, and satisfies the relationship 70mm≤L2≤100mm.

[0070] The first side and the second side are the two sides of the pressing plate 3 in the second direction. When the arrangement position relationship of the pressing plate 3 meets the above parameter range, the pressing plate 3 is arranged in the middle area of ​​the battery 1 in the second direction (also in the length direction of the battery 1), so that it can fully correspond to the battery 1 and play a good restraining role on the battery 1.

[0071] In some embodiments of the present application, L1 = L2, such as L1 = L2 = 70 mm. In this case, the pressing plate 3 is arranged in the middle of the battery 1, which has a good restraining effect on the battery 1.

[0072] In an embodiment of the present application, the insulating edging 52 includes: a first covering portion 521 and a second covering portion 522, the first covering portion 521 is connected to the insulating layer main body 51, and the first covering portion 521 is arranged opposite to the side wall of the pressure plate 3 in the second direction, and the second covering portion 522 is connected to the first covering portion 521 and extends along the second direction, and is arranged in contact with the surface of the side of the pressure plate 3 away from the battery 1, thereby forming two U-shaped insulating edging 52 structures with openings opposite to each other on both sides of the pressure plate 3 in the second direction. The insulating edging 52 structure can cover the edge of the pressure plate 3 to improve the insulation protection performance of the pressure plate 3.

[0073] As shown in FIG3 , in some embodiments of the present application, the width of the second covering portion 522 in the second direction is L3 and satisfies the relationship: 2 mm ≤ L3 ≤ 5 mm. L3 ≤ 3 mm improves the insulation protection performance at the edge of the pressing plate 3 while saving material for the insulating layer 5 and reducing costs.

[0074] In some embodiments of the present application, the insulating layer 5 is constructed as a PI film (Polyimide Film), which has good insulating properties.

[0075] In some embodiments of the present application, the battery pack 100 further includes an adhesive layer 7, which is used to bond the insulating layer body 51 and the battery 1 to fix the pressing plate 3 and the battery 1. The adhesive layer 7 is a structural adhesive with a thickness of 1 mm.

[0076] According to the battery pack 100 of the embodiment of the present application, the pressure plate 3 is fixed to the tray 21 by the mounting block 22, and an anti-error structure (i.e., the positioning fitting portion 301) is formed on the pressure plate 3, which can assist in the assembly of the pressure plate 3, and the pressure plate 3 only partially corresponds to the battery 1, thereby reducing the size of the pressure plate 3, reducing the amount of glue used, and reducing the production cost of the battery pack 100.

[0077] According to the electric device of the embodiment of the present application, the electric device includes the above-mentioned battery pack 100. The battery pack 100 is light in weight, meets the lightweight design requirements, and has low production costs.

[0078] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means more than two, unless otherwise specifically defined.

[0080] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0081] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0083] Although the embodiments of the present application have been shown and described above, the above embodiments are exemplary and should not be understood as limitations on the present application. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery pack, comprising: A plurality of batteries (1); A shell component (2), wherein a plurality of batteries (1) are arranged in sequence along a first direction in a cavity of the shell component (2); A pressing plate (3), the pressing plate (3) being arranged in the cavity and connected to the shell assembly (2), and the pressing plate (3) extending along the first direction and being arranged above the plurality of batteries (1) to constrain the plurality of batteries (1); The dimension of the pressing plate (3) in the second direction is not greater than the dimension of the battery (1) in the second direction, and the second direction is arranged perpendicular to the first direction.

2. The battery pack according to claim 1, wherein: The projection area of ​​the plurality of batteries (1) on the bottom surface of the shell component (2) is S1, the overlapping area of ​​the projection of the pressure plate (3) on the bottom surface of the shell component (2) and the projection of the plurality of batteries (1) on the bottom surface of the shell component (2) is S2, and the relationship is satisfied: 0.6S1≤S2<S1.

3. The battery pack according to claim 1 or 2, wherein: In the projection of the bottom surface of the shell assembly (2), the pressure plate (3) has a first symmetry axis extending along a first direction, and the plurality of batteries have a second symmetry axis extending along the first direction, and the first symmetry axis coincides with the second symmetry axis.

4. The battery pack according to any one of claims 1 to 3, wherein: In the second direction, the ratio of the size of the pressing plate (3) to the size of the battery (1) is between 0.6 and 1.

5. The battery pack according to any one of claims 1 to 4, wherein: The shell component (2) comprises: A tray (21), the tray (21) being used to accommodate the battery (1); A mounting block (22), wherein the mounting block (22) is mounted on the tray (21) and is used to mount the pressing plate (3).

6. The battery pack according to claim 5, wherein: The shell assembly (2) further comprises a partition beam (4), wherein the partition beam (4) is arranged in the tray (21) and extends along the first direction, and the partition beam (4) is used to partition the cavity of the shell assembly (2) to form two accommodating cavities (211) each for arranging a plurality of batteries (1).

7. The battery pack according to claim 6, wherein: A plurality of the mounting blocks (22) are provided in each of the accommodating cavities (211); the mounting blocks (22) are provided on two side beams (212) of the tray (21) that are arranged opposite to each other in the first direction; and at least one of the plurality of mounting blocks (22) is provided with a positioning portion (221); the pressure plate (3) is provided with a positioning matching portion (301), and the positioning matching portion (301) is positioned and matched with the positioning portion (221).

8. The battery pack according to claim 7, wherein: One of the positioning portion (221) and the positioning matching portion (301) is configured as a positioning protrusion, and the other of the positioning portion (221) and the positioning matching portion (301) is configured as a positioning groove.

9. The battery pack according to any one of claims 6 to 8, wherein: There are two pressing plates (3), and the two pressing plates (3) are respectively arranged corresponding to the plurality of batteries (1) in the two accommodating cavities (211), and one of the two pressing plates (3) is provided with a first mounting portion (302), and the partition beam (4) is provided with a second mounting portion (41), and the first mounting portion (302) and the second mounting portion (41) are arranged at intervals along the second direction and are used for installing a distribution box (6).

10. The battery pack according to claim 9, wherein: The first mounting portion (302) is configured as a mounting column, the mounting column being provided with a threaded hole, and the mounting column being plug-fitted with the housing of the distribution box (6) and threadedly engaged with a threaded connector to connect the housing to the pressing plate (3); And / or, the second mounting portion (41) is configured as a mounting seat, the mounting seat protruding from the upper surface of the partition beam (4) toward one side of the distribution box (6), and the mounting seat is connected to the distribution box (6).

11. The battery pack according to any one of claims 1 to 10, wherein: It also comprises an insulating layer (5), wherein the insulating layer (5) is arranged on the pressing plate (3), and at least a part of the insulating layer (5) is arranged between the pressing plate (3) and the battery (1).

12. The battery pack according to claim 11, wherein: The insulating layer (5) comprises: an insulating layer body (51), the insulating layer body (51) being arranged on a surface of a side of the pressing plate (3) opposite to the battery (1), and at least a portion of the insulating layer body (51) being arranged in a corresponding area between the pressing plate (3) and a plurality of the batteries (1); An insulating edging (52), the insulating edging (52) is connected to the insulating layer body (51) and is used to cover the edges of the pressing plate (3) on both sides in the second direction.

13. The battery pack according to claim 12, wherein: In the projection of the bottom surface of the shell assembly (2), the minimum distances between the edges of the pressure plate (3) and the battery (1) on the same side of the second direction are L1, L2, and satisfy the relationship 70mm≤L1≤100mm, 70mm≤L2≤100mm.

14. The battery pack according to claim 12 or 13, wherein: The insulating edge wrapping (52) comprises: a first covering portion (521), the first covering portion (521) being connected to the insulating layer body (51), and the first covering portion (521) being arranged opposite to a side wall of the pressing plate (3) in the second direction; A second covering portion (522), the second covering portion (522) is connected to the first covering portion (521), extends along the second direction, and is disposed in contact with a surface of a side of the pressing plate (3) facing away from the battery (1).

15. The battery pack according to claim 14, wherein: The width dimension of the second covering portion (522) in the second direction is L3, and satisfies the relationship: 2mm≤L3≤5mm.

16. An electrical device comprising the battery pack according to any one of claims 1 to 15.

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