Battery pack

Abstract

The embodiment of the utility model provides a battery pack which comprises a shell and a battery module, the shell is of a split structure and comprises a first plate body, a second plate body and two third plate bodies, the first plate body, the second plate body and the two third plate bodies are mutually independent, and the two third plate bodies are oppositely arranged in the first direction and connected. The first plate body and the second plate body are arranged on the two third plate bodies to define a containing cavity with openings in the two ends in the second direction, the first plate body and the second plate body are connected to the two sides, in the second direction, of the two third plate bodies respectively and block the openings, and the battery module is connected into the containing cavity. According to the battery pack provided by the embodiment of the invention, the four plate body parts of the shell are mutually independent, the single plate body is simple in structure and convenient to process, and the quality of a finished product is easier to control, so that the adverse risks of non-uniform thickness, warping deformation, stress concentration and the like caused by high processing difficulty of the shell are greatly reduced, the product yield is improved, and the production cost is reduced. And the mechanical property and the appearance effect of the product are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery pack. BACKGROUND

[0002] In the related art, there is a battery pack shell, which is divided into an upper shell and a lower shell, and the upper shell and the lower shell are both integrated structures and are assembled during the assembly of the battery pack. The upper shell and the lower shell of the integrated structure improve the structural strength of the shell.

[0003] Among them, the lower shell is usually composed of several parts, namely an arc-shaped bottom wall and a side wall connected to the arc-shaped bottom wall. In this structure, in order to form a sealed cavity for placing the battery module inside the shell, the side wall usually extends towards the upper shell and is connected to the upper shell, so that the lower shell finally forms a special-shaped structure with the side wall protruding from the bottom wall. The lower shell of such a special-shaped structure is difficult to process, and the finished product is prone to problems such as uneven thickness, warping deformation, stress concentration, etc., resulting in a low yield of the shell product, and also affecting the overall appearance and mechanical properties of the battery pack. CONTENT OF THE UTILITY MODEL

[0004] The application aims to provide a battery pack to solve the problem that the finished product of the lower shell of the existing battery pack is prone to problems such as uneven thickness, warping deformation, stress concentration, etc., resulting in a low yield of the shell product.

[0005] To solve the above technical problems, the application is implemented as follows:

[0006] The application discloses a battery pack, which includes first and second directions intersecting with each other, and comprises a shell and a battery module. The shell is a split structure and includes first and second plate bodies and two third plate bodies which are independent of each other. The two third plate bodies are oppositely arranged along the first direction and connected to enclose a containing cavity with openings at both ends along the second direction. The first and second plate bodies are connected on both sides of the two third plate bodies along the second direction and block the openings. The battery module is connected in the containing cavity.

[0007] Optionally, the third plate body includes a flat plate part and two arc-shaped parts which are arranged on both sides of the flat plate part along the third direction, and the third direction intersects with the first and second directions. The flat plate parts of the two third plate bodies are oppositely and spaced apart along the first direction, and the two third plate bodies are connected through the arc-shaped parts.

[0008] Optionally, the two arc-shaped parts are symmetrically arranged along the third direction.

[0009] Optionally, the arc-shaped part corresponds to a right angle.

[0010] Optionally, the battery pack further comprises a circuit board, a thickness direction of the circuit board extends along the second direction, the circuit board is arranged between the first plate body and the battery module along the second direction, and the circuit board is connected to the first plate body, wherein the first plate body is provided with a positioning portion for assembly positioning of the circuit board.

[0011] Optionally, the positioning portion is a positioning column extending along the second direction towards the battery module, the circuit board is provided with a positioning hole matched with the positioning column, and part of the positioning column passes through the positioning hole to achieve assembly positioning of the circuit board.

[0012] Optionally, the positioning column comprises a support portion and a guide portion, wherein the support portion is connected to the first plate body, and the guide portion is connected to an end of the support portion away from the first plate body, and the guide portion is used for passing through the positioning hole.

[0013] Optionally, the number of the positioning portions is multiple, and the multiple positioning portions are arranged at intervals on the first plate body.

[0014] Optionally, an edge of the circuit board is provided with a limiting groove, and the first plate body is further provided with a limiting portion, the limiting portion is at least partially embedded in the limiting groove to limit displacement of the circuit board along the second direction.

[0015] Optionally, the limiting portion comprises a limiting column and a buckle, the limiting column is connected to the first plate body, the buckle is connected to an end of the limiting column away from the first plate body, the limiting column is at least partially embedded in the limiting groove, and the buckle is clamped on a side of the circuit board away from the first plate body.

[0016] In the embodiment, the shell of the battery pack is a split structure and comprises a first plate body, a second plate body and two third plate bodies which are arranged opposite to each other along a first direction and connected, so as to form a containing cavity for placing the battery module, the containing cavity has openings at two ends along a second direction, and the first plate body and the second plate body are respectively connected to two sides of the two third plate bodies along the second direction and block the openings of the containing cavity, so that the shell meets the installation condition of containing the battery module. In the battery pack provided in the embodiment, the four plate body parts of the shell are independent of each other, the single plate body structure is simple and convenient to process, and the finished product quality is easier to control, which greatly reduces the adverse risks such as uneven thickness, warping deformation and stress concentration of the shell caused by large processing difficulty, improves the product yield, and improves the mechanical properties and appearance effect of the product.

[0017] Additional aspects and advantages of the present application will be made apparent from the following description, which, when taken in conjunction with the accompanying drawings, whores: BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood by considering the following detailed description, from which the embodiments emerge, in conjunction with the accompanying drawings.

[0019] Figure 1 is a schematic diagram of an explosion of a battery pack in the prior art;

[0020] Figure 2 is a side view of a lower shell of a battery pack in the prior art;

[0021] Figure 3 is a schematic diagram of an explosion of a battery pack in the embodiments of the present application;

[0022] Figure 4 is an assembly schematic diagram of a first plate body and a circuit board in the embodiments of the present application.

[0023] Reference signs: 10 - first plate body, 11 - positioning portion, 111 - support portion, 112 - guide portion, 12 - limiting portion, 121 - limiting column, 122 - buckle, 20 - second plate body, 30 - third plate body, 31 - flat plate portion, 32 - arc-shaped portion, 40 - battery module, 50 - circuit board, 51 - positioning hole, 52 - limiting groove, 101 - upper shell, 102 - lower shell, 1021 - arc-shaped bottom wall, 1022 - side wall, x - first direction, y - second direction, z - third direction. DETAILED DESCRIPTION

[0024] Embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0025] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally means that the front and rear associated objects are in an "or" relationship.

[0026] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0027] In the description of the present application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Referring to Figure 1 , Figure 2 , a schematic diagram of a battery pack structure in the prior art is shown in Figure 1 , in which the shell of the battery pack mainly includes two parts, an upper shell 101 and a lower shell 102, and the lower shell 102 further includes an arc-shaped bottom wall 1021 and a side wall 1022 connected to the side of the arc-shaped bottom wall 1021. The arc-shaped bottom wall 1021 includes a flat plate part in the middle along the third direction z and arc-shaped parts connected to both sides of the flat plate part, and the side wall 1022 is a planar structure and is integrally formed with the arc-shaped bottom wall 1021. The upper shell 101 in this battery pack structure is approximately symmetrical with the arc-shaped bottom wall 1021, so the side walls 1022 on both sides of the bottom wall need to extend towards the upper shell 101 and be connected to the upper shell 101, so that the upper shell 101 and the lower shell 102 can form an accommodation cavity for accommodating the battery module. In this case, the lower shell 102 forms a special-shaped structure as shown in Figure 1 , as shown in Figure 2 , in the side wall 1022 of the lower shell 102, the lower half along the first direction x is used to connect the arc-shaped bottom wall 1021, and the upper half protrudes from the arc-shaped part 32 of the bottom wall and extends towards the upper shell 101 for connection with the upper shell 101. In order to meet the connection condition with the upper shell 101, the side wall 1022 is Figure 2The arrow in the diagram indicates that the wall thickness changed at part A, resulting in poor smoothness of the overall structure. Furthermore, since the lower shell 102 is generally manufactured by injection molding, it is prone to defects such as uneven thickness, shrinkage, warping, and stress concentration during the injection molding process, which seriously affect the appearance and mechanical properties of the product.

[0029] Based on the above problems, this application provides a battery pack. Specifically, the battery pack provided in this application adopts a split structure design for its shell. The shell parts are independent of each other, have simple and smooth transitions, and do not have any special protruding structures. This also avoids risks such as uneven thickness, shrinkage, warping deformation, and stress concentration during processing and molding, which greatly improves the yield of the shell, enhances the practicality of mass production, and greatly improves the appearance, thereby enhancing product competitiveness.

[0030] The battery pack provided in the embodiments of this application will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0031] It should be noted that the battery pack provided in this application embodiment includes a first direction x, a second direction y, and a third direction z that intersect each other. Preferably, the first direction x, the second direction y, and the third direction z are perpendicular to each other. The perpendicularity includes a reasonable angle range with a certain fluctuation from 90°, which can achieve the technical effect required by this application, such as 90°±10°.

[0032] Reference Figure 3 , Figure 4 The diagram shows a schematic representation of the battery pack structure in an embodiment of this application. Figure 3 , Figure 4 As shown, the battery pack provided in this application embodiment may specifically include: a housing and a battery module 40. The housing is a split structure and includes a first plate 10, a second plate 20 and two third plates 30 that are independent of each other. The two third plates 30 are arranged opposite to each other along the first direction x and connected to form a receiving cavity with openings at both ends along the second direction y. The first plate 10 and the second plate 20 are respectively connected to the two third plates 30 on both sides along the second direction y and seal the receiving cavity. The battery module 40 is connected in the receiving cavity.

[0033] Specifically, the third plate body 30 is an arc-shaped plate body, and the edges of one third plate body 30 on both sides along the third direction z are bent towards the other third plate body 30, the two third plate bodies 30 are oppositely arranged along the first direction x and are connected to each other, and in the case where the two third plate bodies 30 are connected, an accommodating cavity with an opening is formed between the two third plate bodies 30, and the opening is formed on both sides of the two third plate bodies 30 along the second direction y, and the accommodating cavity can be used to accommodate the battery module 40, and further, on both sides of the whole formed by the two third plate bodies 30, the first plate body 10 and the second plate body 20 are connected respectively, and the structure and size of the first plate body 10 and the second plate body 20 are adapted to the opening of the accommodating cavity, so as to block the opening on both sides of the accommodating cavity along the second direction y and make the shell form a complete whole.

[0034] The shell structure described above includes four mutually independent plate body parts, the structure of a single plate body is simple and convenient to process, and the finished product quality is easier to control, which greatly reduces the risk of uneven thickness, warping deformation, stress concentration and other adverse risks caused by the difficulty of shell processing, improves the product yield, and improves the mechanical properties and appearance effect of the product.

[0035] It should be noted that in actual application, the battery pack shell is designed as an arc-shaped structure as shown in Figure 3 for example, as shown in Figure 3 the battery module 40 inside the battery pack is arranged and assembled by a plurality of cylindrical battery cells, and this structure of the shell can save the internal space of the battery pack and improve the space utilization, at the same time, due to the unique shape of the arc-shaped shell, the impact force can be better dispersed when the shell is subjected to external impact, reducing damage caused by excessive local stress, which helps to improve the safety and reliability of the battery pack.

[0036] Optionally, the third plate body 30 includes a flat plate part 31 and two arc-shaped parts 32, and the two arc-shaped parts 32 are arranged on both sides of the flat plate part 31 along the third direction z; the flat plate parts 31 of the two third plate bodies 30 are oppositely and spaced apart along the first direction x, and the two third plate bodies 30 are connected through the arc-shaped parts 32.

[0037] Specifically, in the embodiment of the present application, the flat plate part 31 and the two arc-shaped parts 32 of the third plate body 30 are integrally formed, and this design of combining the flat plate part 31 and the two arc-shaped parts 32 optimizes the structural performance of the battery pack shell. Specifically, the two arc-shaped parts 32 are arranged on both sides of the flat plate part 31 along the third direction z, which enhances the structural strength of the third plate body 30 itself, and also enables the two third plate bodies 30 to achieve a smoother and more stable transition when connected through the arc-shaped parts 32, effectively dispersing the stress concentration problem at the connection, and reducing the deformation and warping phenomenon caused by uneven stress.

[0038] In addition, the presence of the arc-shaped portion 32 also improves the rigidity and impact resistance of the shell as a whole, so that the battery pack can better maintain shape stability when subjected to external impact or vibration, thereby protecting the internal battery module 40 from damage.

[0039] In some embodiments of the present application, the two arc-shaped portions 32 are symmetrically arranged along the third direction z.

[0040] Specifically, the two arc-shaped portions 32 are structurally identical and symmetrically arranged with respect to the flat plate portion 31, and both arc-shaped portions 32 are curved toward the other third plate body 30. In practical applications, the two symmetrically arranged arc-shaped portions 32 can ensure that the two third plate bodies 30 have higher balance and stability when connected. Since the arc-shaped portions 32 are symmetrically arranged along the third direction z, the mechanical effects of the arc-shaped portions 32 on the third plate body 30 cancel each other out, reducing the distortion or deviation that may be caused by asymmetric design, thereby effectively preventing deformation of the shell during manufacturing and use. In addition, the symmetric design also enhances the overall aesthetics of the battery pack shell. Visually, the symmetric arc-shaped portions 32 make the lines of the shell smoother and more harmonious, which conforms to the aesthetic trend of modern industrial design. This aesthetic not only improves the market competitiveness of the product, but also enhances the user's favorability of the product.

[0041] In some embodiments of the present application, the central angle of the arc-shaped portion 32 is a right angle.

[0042] It can be understood that when the central angle of the arc-shaped portion 32 is a right angle, the two sides of the arc-shaped portion 32 are tangent to the flat plate portion 31 of the third plate body 30 and the arc-shaped portion 32 of the other third plate body 30, respectively, so that the outer surface of the shell including the two third plate bodies 30 is smoother and the structure is more aesthetically pleasing. In addition, the shape of the third plate body 30 is more regular, which facilitates subsequent assembly and debugging work, thereby improving production efficiency and product quality.

[0043] In some embodiments of the present application, the battery pack further includes a circuit board 50, the thickness direction of the circuit board 50 extends along the second direction y, and the circuit board 50 is arranged between the first plate body 10 and the battery module 40 along the second direction y. The circuit board 50 is connected to the first plate body 10, and further, the first plate body 10 is provided with a positioning portion 11 for assembly and positioning of the circuit board 50.

[0044] Specifically, the circuit board 50 is a printed circuit board (PCB) and provides battery management, energy conversion and distribution, etc. for the battery pack. The PCB is integrated with a battery management chip and related circuits, which can accurately control the charging and discharging of the battery, ensure that the battery works in a safe and efficient range, and also has overcharge, overdischarge, overcurrent and other protection functions. In addition, the circuits and electronic components on the PCB can convert voltage and current, convert the electrical energy provided by the battery module 40 into voltage and current suitable for the use of the device, and ensure the normal operation of the device.

[0045] In the embodiment of the present application, the positioning portion 11 is arranged on the first plate body 10 to provide a precise positioning reference for the assembly of the circuit board 50, thereby reducing the assembly difficulty and error of the circuit board 50 and making the installation process of the circuit board 50 simpler and more efficient. At the same time, the presence of the positioning portion 11 also enhances the connection strength between the circuit board 50 and the first plate body 10, preventing the circuit board 50 from loosening or falling off during use, and further improving the overall structural stability of the battery pack.

[0046] In addition, it should be noted that in the prior art, since the lower shell 102 is integrally formed, the side wall 1022 of the lower shell 102 interferes with the installation of the circuit board 50, and it is difficult for the operator to carefully observe the installation state of the circuit board 50, and there is a risk of crushing the circuit board 50. However, since the shell provided in the embodiment of the present application has a split structure, in actual application, the circuit board 50 can be assembled and fixed with the first plate body 10 first. During the assembly process of the circuit board 50 and the first plate body 10, the circuit board 50 can be carefully identified to avoid crushing the circuit board 50 during the assembly process, which affects the structural performance and use performance of the circuit board 50, greatly improves the product yield, avoids the cost waste caused by product rework, and improves the product competitiveness.

[0047] Optionally, the positioning portion 11 is a positioning column extending towards the battery module 40 along the second direction y, and the circuit board 50 is provided with a positioning hole 51 matched with the positioning column, and part of the positioning column passes through the positioning hole 51 to realize the assembly and positioning of the circuit board 50.

[0048] Specifically, the positioning column is a cylindrical structure, the positioning hole 51 is matched with the structure of the positioning column and is a circular hole structure with a diameter slightly larger than that of the positioning column, so that the positioning column can pass through the positioning hole 51 during assembly of the circuit board 50 and ensure the assembly accuracy.

[0049] It should be noted that the matching mode of the positioning column and the positioning hole 51 greatly improves the assembly accuracy and reliability of the circuit board 50, effectively prevents the offset or misplacement of the circuit board 50 during installation, thereby ensuring the compactness and consistency of the internal structure of the battery pack; in addition, this positioning mode simplifies the assembly process, improves the production efficiency, and the operator has small operation difficulty; after part of the positioning column passes through the positioning hole 51, the movement of the circuit board 50 can also be limited to a certain extent, thereby improving the stability of the circuit board 50 inside the battery pack.

[0050] Further, the positioning column includes a support part 111 and a guide part 112, wherein the support part 111 is connected to the first plate body 10, and the guide part 112 is connected to one end of the support part 111 away from the first plate body 10, and the guide part 112 is used to pass through the positioning hole 51.

[0051] Wherein, the positioning column and the first plate body 10 are an integral molding structure, the support part 111 is stably connected to the first plate body 10, providing a support basis for the entire positioning column, and the guide part 112 is connected to one end of the support part 111 away from the first plate body 10, and is designed to be a structure with a smaller diameter than the support part 111, so as to facilitate passing through the positioning hole 51 on the circuit board 50. In addition, the positioning column can also be bonded to the first plate body 10, and the embodiments of the present application do not make specific limitations thereto.

[0052] During assembly, the guide part 112 can guide the positioning hole 51 on the circuit board 50 to gradually approach and fit into the positioning column, so that the circuit board 50 can be easily and accurately installed at the predetermined position. This design not only simplifies the assembly process, improves production efficiency, but also reduces the failure rate caused by assembly errors.

[0053] Optionally, the number of positioning parts 11 is multiple, and the multiple positioning parts 11 are arranged at intervals on the first plate body 10. Wherein, the positioning part 11 is arranged on one side of the first plate body 10 close to the edge, and the multiple positioning parts 11 are arranged at intervals around the edge of the first plate body 10.

[0054] It can be understood that the arrangement of multiple positioning parts 11 helps to improve the assembly stability and reliability between the circuit board 50 and the first plate body 10. By increasing the number of positioning columns, the stress and deformation generated during the assembly of the circuit board 50 can be more effectively dispersed, and compared with arranging one positioning part 11, the risk of assembly deviation or looseness can also be reduced.

[0055] Further, the edge of the circuit board 50 is provided with a limiting groove 52, and the first plate body 10 is further provided with a limiting part 12, and the limiting part 12 is at least partially embedded in the limiting groove 52 to limit the displacement of the circuit board 50 along the second direction y.

[0056] Specifically, the limiting groove 52 is a notch formed at the edge of the circuit board 50, and the limiting groove 52 and the limiting portion 12 can be multiple, the multiple limiting grooves 52 are arranged at intervals on the edge of the circuit board 50, and the position and number of the limiting portion 12 are matched with the limiting groove 52. In the embodiment of the application, the limiting groove 52 and the limiting portion 12 can enhance the fixing effect of the circuit board 50 on the first plate body 10, and effectively limit the displacement of the circuit board 50 along the second direction y. Wherein, the opening size of the limiting groove 52 allows adjustment within a certain range, so that the limiting portion 12 can be smoothly embedded therein.

[0057] Optionally, the limiting portion 12 includes a limiting column 121 and a buckle 122, the limiting column 121 is connected to the first plate body 10, the buckle 122 is connected to the end of the limiting column 121 away from the first plate body 10, the limiting column 121 is at least partially embedded in the limiting groove 52, and the buckle 122 is clamped on the side of the circuit board 50 away from the first plate body 10.

[0058] Specifically, the buckle 122 extends towards the inside of the circuit board 50, after the circuit board 50 is connected to the first plate body 10, the limiting column 121 is at least partially embedded in the limiting groove 52, and the buckle 122 is located on the side of the circuit board 50 away from the first plate body 10, since the buckle 122 extends towards the inside of the circuit board 50, it plays a mechanical limiting effect, which can limit the circuit board 50 from being separated from the first plate body 10 along the second direction y. Further, the end of the buckle 122 away from the first plate body 10 is provided as a slope, which can be used as a guide surface, when the circuit board 50 is assembled with the first plate body 10, the operator only needs to align the circuit board 50 with the positioning column and press it gently, so that the buckle 122 is clamped on the side of the circuit board 50 away from the first plate body 10, which can realize the quick installation of the circuit board 50 without the need for additional fixing tools or complex operation steps. This not only reduces the assembly difficulty, but also reduces the assembly time, which is conducive to the implementation of large-scale production lines.

[0059] In summary, the battery pack provided by the embodiment of the application has at least the following advantages:

[0060] In the embodiments of the present application, the shell of the battery pack is a split structure, and comprises a first plate body, a second plate body and two third plate bodies which are independent of each other. When the two third plate bodies are arranged opposite to each other along a first direction and connected, an accommodating cavity for placing the battery module is formed. The two ends of the accommodating cavity along a second direction have openings. The first plate body and the second plate body are respectively connected to the two sides of the two third plate bodies along the second direction and block the openings of the accommodating cavity, so that the shell meets the installation condition of accommodating the battery module. In the battery pack provided by the embodiments of the present application, the four plate body parts of the shell are independent of each other. The single plate body has a simple structure, is easy to process, and the quality of the finished product is easy to control. The thickness of the shell is not uniform, is warped and deformed, and stress is concentrated due to the difficulty in processing, and other adverse risks are greatly reduced. The product yield is improved, and the mechanical properties and appearance effect of the product are improved.

[0061] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does 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.

[0062] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery pack comprising a first direction (x), a second direction (y) that intersect each other two by two, characterized in that, The battery pack comprises a shell and a battery module (40), the shell is a split structure and comprises a first plate body (10), a second plate body (20) and two third plate bodies (30) which are independent of each other, wherein the two third plate bodies (30) are oppositely arranged along a first direction (x) and connected to enclose a receiving cavity with openings at both ends along a second direction (y), the first plate body (10) and the second plate body (20) are respectively connected on both sides of the two third plate bodies (30) along the second direction (y) and block the openings, and the battery module (40) is connected in the receiving cavity.

2. The battery pack of claim 1, wherein, The third plate body (30) comprises a flat plate part (31) and two arc-shaped parts (32), the two arc-shaped parts (32) are respectively arranged on both sides of the flat plate part (31) along a third direction (z), and the third direction (z) intersects with the first direction (x) and the second direction (y) in pairs; the flat plate parts (31) of the two third plate bodies (30) are oppositely arranged along the first direction (x), and the two third plate bodies (30) are connected through the arc-shaped parts (32).

3. The battery pack of claim 2, wherein, The two arc-shaped parts (32) are symmetrically arranged along the third direction (z).

4. The battery pack of claim 2, wherein, The central angle of the arc-shaped part (32) is a right angle.

5. The battery pack of claim 1, wherein, The battery pack further comprises a circuit board (50), the thickness direction of the circuit board (50) extends along the second direction (y), the circuit board (50) is arranged between the first plate body (10) and the battery module (40) along the second direction (y), the circuit board (50) is connected to the first plate body (10), wherein the first plate body (10) is provided with a positioning part (11) for assembly positioning of the circuit board (50).

6. The battery pack of claim 5, wherein, The positioning part (11) is a positioning column extending towards the battery module (40) along the second direction (y), the circuit board (50) is provided with a positioning hole (51) matched with the positioning column, and part of the positioning column passes through the positioning hole (51) to realize assembly positioning of the circuit board (50).

7. The battery pack of claim 6, wherein, The positioning column comprises a supporting part (111) and a guide part (112), wherein the supporting part (111) is connected to the first plate body (10), the guide part (112) is connected to one end of the supporting part (111) away from the first plate body (10), and the guide part (112) is used for passing through the positioning hole (51).

8. The battery pack of claim 5, wherein, The number of the positioning parts (11) is multiple, and the multiple positioning parts (11) are arranged at intervals on the first plate body (10).

9. The battery pack of claim 5, wherein, The edge of the circuit board (50) is provided with a limiting groove (52), and the first plate body (10) is further provided with a limiting part (12), the limiting part (12) is at least partially embedded in the limiting groove (52) to limit the displacement of the circuit board (50) along the second direction (y).

10. The battery pack of claim 9, wherein, The limiting part (12) comprises a limiting column (121) connected to the first plate body (10) and a buckle (122) connected to one end of the limiting column (121) away from the first plate body (10), wherein the limiting column (121) is at least partially embedded in the limiting groove (52), and the buckle (122) is clamped on one side of the circuit board (50) away from the first plate body (10).

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