Battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a battery device and electric equipment. In the embodiment of the invention, the meshing parts are arranged on the end faces of the two ends of the expansion beam in the lengthwise direction and the matching surfaces, matched with the end faces, of the box body, so that the meshing parts located on the end faces are meshed with the meshing parts located on the corresponding matching surfaces, and approximately embedded connection can be formed; the connection tightness of the expansion beam and the box body is improved, so that the degree of freedom of the expansion beam and the box body can be limited, and the risk that the expansion beam is loosened and even separated from the box body can be reduced when the battery box body is subjected to related acting force. Therefore, the reliability of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and an electric equipment. BACKGROUND

[0002] In the development of battery technology, in addition to improving the performance of the battery device, the reliability of the battery device is also a problem that cannot be ignored. If the reliability of the battery device is low, it will directly affect the reliability, use cost and user experience of the terminal product. Therefore, how to enhance the reliability of the battery device is a technical problem to be solved in the battery technology. SUMMARY

[0003] Therefore, the present application provides a battery device and an electric equipment, which can improve the reliability of the battery device.

[0004] In a first aspect, the present application provides a battery device, comprising: a box body comprising a box main body and an expansion beam, the expansion beam being arranged in the box main body and defining a containing space together with the box main body; and a battery monomer arranged in the containing space; wherein the expansion beam has two end faces arranged opposite along the longitudinal direction of the expansion beam, and the box main body has two matching faces arranged opposite corresponding to the two end faces; the end face and the matching face are both provided with engagement parts; the engagement part on the end face and the engagement part on the corresponding matching face are engaged with each other to limit the degrees of freedom of the expansion beam and the box main body.

[0005] In the technical scheme of the present application, the engagement parts are arranged on the end faces of the two ends of the expansion beam along the longitudinal direction and the matching faces of the box main body corresponding to the end faces, so that the engagement parts on the end faces and the engagement parts on the corresponding matching faces are engaged with each other to form a roughly embedded connection, which improves the tightness of the connection between the expansion beam and the box main body, thereby limiting the degrees of freedom of the expansion beam and the box main body, and reducing the risk of loosening or even separating of the expansion beam from the box main body when the battery box is subjected to relevant forces. Therefore, the reliability of the battery device can be improved.

[0006] In some embodiments, the box main body has a bottom wall, and the end face and the matching face are both provided with a plurality of engagement parts; all the engagement parts on the same face are arranged in a direction away from the bottom wall.

[0007] Since all the engagement parts on the same face are arranged in a direction away from the bottom wall, a multi-layer engagement and matching structure can be formed in the direction away from the bottom wall, thereby forming a multi-layer structure for limiting the movement of the expansion beam in the direction away from the bottom wall, and further limiting the movement of the expansion beam when the battery device is subjected to external forces and vibrates, thereby improving the stability and reliability of the connection between the expansion beam and the box main body.

[0008] In some embodiments, the engagement portions have roots connected to the faces on which the engagement portions are located, and top edges spaced apart from the roots; the bottom wall has a first side located in the accommodation space, and a second side disposed opposite the first side; for at least some of the engagement portions located on the same mating face, in a direction from the second side to the first side, the top edge of a previous engagement portion is closer to the center of the bottom wall than the top edge of a subsequent engagement portion.

[0009] In this way, the top edges of the engagement portions on the same mating face are not aligned in the direction from the second side to the first side, and the closer to the bottom wall, the closer to the center of the bottom wall in the part of the end face and the corresponding mating face that is in contact, thereby forming engagement portions that are partially inclined, and further supporting the expansion beam. In this way, both ends of the expansion beam in the longitudinal direction can be further supported, further improving the stability and reliability of the connection between the expansion beam and the box body.

[0010] In some embodiments, for all the engagement portions located on the same mating face, in a direction from the second side to the first side, the top edge of a previous engagement portion is closer to the center of the bottom wall than the top edge of a subsequent engagement portion.

[0011] In this way, the engagement portions on the same mating face can be both multi-layered and multi-supported, and together form a support structure that is contracted towards the bottom wall on both sides of the expansion beam in the longitudinal direction, further improving the support of the expansion beam, thereby improving the stability and reliability of the connection between the expansion beam and the box body.

[0012] In some embodiments, the engagement portions have roots connected to the faces on which the engagement portions are located, and top edges spaced apart from the roots; the engagement portions have front edges and rear edges between the roots and the faces on which the engagement portions are located; the front edges are closer to the bottom wall than the rear edges; there is a target engagement portion among all the engagement portions located on the same mating face; the front edge of the target engagement portion is closer to the center of the bottom wall than the rear edge of the target engagement portion.

[0013] In this way, the root of the target engagement portion is inclined, so that the root of the target engagement portion can be used to support the expansion beam, thereby improving the stability and reliability of the connection between the expansion beam and the box body.

[0014] In some embodiments, the front edge of the target engagement portion points in the direction of the rear edge of the target engagement portion, and is disposed at a first preset angle with the thickness direction of the bottom wall; the first preset angle is less than or equal to 5°.

[0015] In this way, by controlling the size of the first preset angle, not only the contact area between the end face and the corresponding mating face can be increased, but also the assembly and connection of the box body and the expansion beam can be facilitated.

[0016] In some embodiments, at least one of the end face and the mating face is defined as a target face; for all the engagement portions located on the same target face, there are two engagement portions adjacent and spaced apart in a direction away from the bottom wall.

[0017] By arranging the engagement portions spaced apart, the end face and the corresponding mating face can be directly abutted at the spacing, thereby facilitating the transmission of the external force received by the expansion beam to the box body more quickly, reducing the influence of the external force on the expansion beam, and improving the stability and reliability of the expansion beam.

[0018] In some embodiments, between the two engagement portions located on the same target face and adjacent and spaced apart in a direction away from the bottom wall, a connecting face is defined; the connecting face is configured as a plane.

[0019] Since the connecting face is configured as a plane, it is more conducive to support the expansion beam and more conducive to the external force received by the expansion beam to be dispersed more evenly on the connecting face and transmitted to the box body more quickly, thereby improving the stability of the expansion beam.

[0020] In some embodiments, the connecting face located on the same target face is provided with a plurality of connecting faces; among all the connecting faces located on the same target face, there are a plurality of connecting faces parallel to each other; and / or, among all the connecting faces located on the same target face, there are a plurality of connecting faces located on the same plane.

[0021] When the plurality of connecting faces are parallel to each other and / or located on the same plane, the plurality of connecting faces can support the expansion beam in the same direction, and at the same time, when the expansion beam receives an external force, the external force can be transmitted to the box body in the same direction, so that the direction of the force transmitted by each connecting face in the plurality of connecting faces can tend to be consistent, which is conducive to more evenly dispersing stress and improving the situation of stress concentration. In this way, it is not only conducive to assembling and supporting the expansion beam, but also conducive to more effectively transmitting the external force received by the expansion beam to the box body.

[0022] In some embodiments, in the thickness direction of the bottom wall, the connecting face has a starting edge closer to the bottom wall and a terminal edge farther away from the bottom wall; the orthogonal projection of the starting edge on the bottom wall is closer to the center of the bottom wall than the orthogonal projection of the terminal edge on the bottom wall.

[0023] Thus, since the connecting surfaces are arranged to be substantially inclined, and the connecting surfaces on the two mating surfaces can substantially constitute a shrinkage structure that is closer to each other as closer to the bottom wall, the expansion beam can be further supported by the connecting surfaces.

[0024] In some embodiments, the connecting surface is arranged at a second preset angle with the thickness direction of the bottom wall, and the second preset angle is less than or equal to 5°.

[0025] Thus, by controlling the size of the second preset angle, not only can the contact area between the end surface and the corresponding mating surface be increased, which is beneficial for stress conduction and supporting the expansion beam, but also facilitates the assembly and connection of the box body and the expansion beam.

[0026] In some embodiments, the box body has a bottom wall; the end surface has a first edge away from the bottom wall and arranged spaced apart from the bottom wall, and the end surface includes a first extension surface arranged to extend from the first edge towards the bottom wall; the mating surface has a second edge away from the bottom wall and arranged spaced apart from the bottom wall, and the mating surface includes a second extension surface arranged to extend from the second edge towards the bottom wall; and the first extension surface and the corresponding second extension surface abut each other.

[0027] Since the end surface and the corresponding mating surface abut each other at the edge away from the bottom wall by means of the first extension surface and the second extension surface, that is, no engagement is formed at the edge away from the bottom wall, it is beneficial for assembling the expansion beam and the box body, and also beneficial for quickly conducting to the box body when subjected to external force at the edge away from the bottom wall. In this process, the force can be directly applied to the engagement portion, thereby more beneficially improving the stability and reliability of the expansion beam.

[0028] In some embodiments, the first extension surface and the second extension surface are both configured as planes.

[0029] Since the first extension surface and the second extension surface are both configured as planes, it is not only beneficial to realize the abutting cooperation of the end surface and the corresponding mating surface, but also beneficial to use the planes to more stably and uniformly disperse stress, making the overall structure more stable and reliable.

[0030] In some embodiments, the first extension surface has a third edge arranged opposite to the first edge; the orthographic projection of the third edge on the bottom wall is closer to the center of the bottom wall than the orthographic projection of the first edge on the bottom wall; and the second extension surface has a fourth edge arranged opposite to the second edge; the orthographic projection of the fourth edge on the bottom wall is closer to the center of the bottom wall than the orthographic projection of the second edge on the bottom wall.

[0031] In this way, since the first extension surface and the second extension surface are arranged to be inclined, it is beneficial to increase the contact area between the end surface and the corresponding mating surface. By controlling the inclination direction of the first extension surface and the second extension surface, a structure capable of supporting the expansion beam is formed, which is beneficial to improve the stability of the expansion beam.

[0032] In some embodiments, the third edge is directed at an angle to the thickness direction of the bottom wall, and the fourth edge is directed at an angle to the thickness direction of the bottom wall, both angles being a third preset angle; the third preset angle is less than or equal to 5°.

[0033] In this way, by controlling the size of the third preset angle, not only can the contact area of the first extension surface and the corresponding second extension surface be conducive to stress conduction and support of the expansion beam, but also the assembly and connection of the box body and the expansion beam can be facilitated.

[0034] In some embodiments, at least one of the end surface and the mating surface is defined as a target surface; two engagement portions located on the same target surface and adjacent and spaced apart in a direction away from the bottom wall define a connecting surface; for the same target surface, the connecting surface is spaced apart from the orthographic projection of the second extension surface on the bottom wall.

[0035] Since the connecting surface and the second extension surface are spaced apart, the engagement portion can extend longer relative to the second extension surface, the strength near the mating surface can be improved, and thus the support of the box body to the expansion beam can be improved, and the stability and reliability of the expansion beam can be improved.

[0036] In some embodiments, the mating surface is the target surface; for the same mating surface, the distance between the orthographic projection of the connecting surface on the bottom wall and the orthographic projection of the second extension surface on the bottom wall is greater than or equal to 3 mm.

[0037] In this way, by controlling the distance between the connecting surface and the second extension surface, a box body with different support strengths can be obtained, so as to meet different use requirements.

[0038] In some embodiments, two engagement portions located on the same mating surface and adjacent and spaced apart in a direction away from the bottom wall define a connecting surface; wherein, for the same mating surface, the connecting surface and the second extension surface are both configured as planes; the connecting surface and the second extension surface are parallel to each other or located on the same plane; and / or, for the same mating surface, the orthographic projection of the connecting surface on the bottom wall is closer to the center of the bottom wall than the orthographic projection of the second extension surface on the bottom wall.

[0039] In this way, not only is it conducive to assembly and support of the expansion beam, but also it is conducive to more effectively transmitting external forces received by the expansion beam to the box body.

[0040] In some embodiments, the box body comprises: a plate body; a frame body surrounding an edge of the plate body and defining a containing space together with the plate body and the expansion beam; two mounting holes formed on a wall surface of the frame body facing the containing space; and two fitting members respectively inserted into the two mounting holes; and a side surface of the two fitting members facing the containing space respectively forms at least part of two fitting surfaces.

[0041] In this way, by arranging the fitting members, different fitting members can be used according to actual use requirements, and the box body is also convenient to maintain.

[0042] In some embodiments, the fitting member comprises a plug-in part and an abutting part; the plug-in part is inserted into the mounting hole, and the plug-in part has a first surface facing the containing space; the abutting part is arranged on a side of the first surface away from the plate body and abuts against the wall surface of the frame body facing the containing space; and the first surface and a side surface of the abutting part facing the containing space form at least part of the fitting surface.

[0043] In this way, by arranging the fitting member as the plug-in part and the abutting part, the fitting member is convenient to install, and the abutting part can be used to improve the tightness of the connection between the fitting member and the frame body, thereby improving the stability of the overall structure.

[0044] In some embodiments, the tensile strength of the fitting member is greater than the tensile strength of the frame body; and / or the material of the fitting member comprises aluminum alloy.

[0045] In this way, the support and connection stability of the expansion beam are improved, and the frame body is also lightened. By arranging the material of the fitting member to comprise aluminum alloy, the fitting member has high strength, thereby improving the reliability of the connection between the fitting member and the expansion beam.

[0046] In some embodiments, the engagement part is longitudinally arranged on a surface where the engagement part is located; the longitudinal extension direction of the engagement part, the longitudinal direction of the expansion beam and the bearing direction of the box body intersect with each other; and the bearing direction of the box body is the direction in which the box body bears the battery monomer.

[0047] In this way, by arranging the engagement part as a longitudinal component, external forces received by the engagement part can be more evenly distributed to the frame body, the situation that the structure is damaged due to excessive local stress is improved, and the overall bearing capacity and stability of the structure are improved. At the same time, when subjected to external forces, the structure has higher stability and is less likely to deform or displace, thereby improving the overall reliability of the structure.

[0048] In some embodiments, the longitudinal direction of the expansion beam and the load bearing direction of the box body are both perpendicular to the longitudinal extension direction of the engagement portion; and / or, along the longitudinal extension direction of the engagement portion on the end face, the end face has oppositely arranged first and second side edges, and the engagement portion on the end face is arranged to extend from the first side edge to the second side edge; and / or, along the longitudinal extension direction of the engagement portion on the fitting face, the fitting face has oppositely arranged third and fourth side edges, and the engagement portion on the fitting face is arranged to extend from the third side edge to the fourth side edge.

[0049] Since the longitudinal direction of the expansion beam and the load bearing direction of the box body are both perpendicular to the longitudinal extension direction of the engagement portion, when the expansion beam is subjected to external force, the transverse force can be more efficiently transmitted through the engagement portion, and the stress can be more uniformly distributed. Since the engagement portion on the end face is arranged to extend from the first side edge to the second side edge, the end face can be more effectively utilized, so that the end face can be tightly connected to the corresponding fitting face by means of the engagement portion, the contact area of the end face and the corresponding fitting face is increased, and thus the stability and reliability of the overall structure are improved. Since the engagement portion on the fitting face is arranged to extend from the third side edge to the fourth side edge, the fitting face can be more effectively utilized, so that the fitting face can be tightly connected to the corresponding end face by means of the engagement portion, the contact area of the fitting face and the corresponding end face is increased, and thus the stability and reliability of the overall structure are improved.

[0050] In some embodiments, the engagement portion has a root connected to the face where the engagement portion is located, and a top edge spaced apart from the root; along the direction from the root to the top edge, the cross-sectional area of the engagement portion in the direction from the root to the top edge decreases.

[0051] In this way, not only is it beneficial to form an engagement structure, but also the flexibility of the connection can be improved, facilitating the assembly of the expansion beam and the box body. In addition, by appropriately reducing the cross-section of the engagement portion, the stress can be more uniformly distributed between the engagement portions, improving the reliability and stability of the entire connection structure.

[0052] In some embodiments, along the direction from the root to the top edge, the cross-sectional area of the engagement portion in the direction from the root to the top edge decreases successively.

[0053] In this way, the cross-sectional area of the engagement portion changes in a certain regularity, not only facilitating the manufacture of the engagement portion and reducing the processing cost, but also further improving the uniformity of stress distribution through the continuously decreasing cross-sectional area.

[0054] In some embodiments, a profile of a cross section of the engagement portion in a preset direction comprises at least one of a straight line segment and a curved line segment; or, a cross section shape of the engagement portion in the preset direction comprises at least one of a triangle, a trapezoid, a rectangle, a semicircle, and a semi-ellipse; wherein the preset direction, a longitudinal direction of the expansion beam, and a bearing direction of the box body are pairwise intersected; the bearing direction of the box body is a direction in which the box body bears the battery cell.

[0055] In this way, the engagement portion can be flexibly constructed according to the use requirement, which is not specifically limited here.

[0056] In some embodiments, the end face and the corresponding mating face are welded.

[0057] In this way, the end face of the expansion beam and the mating face of the frame body are connected by welding, which can further improve the connection strength between the expansion beam and the frame body. Since the engagement portion on the end face and the engagement portion on the corresponding mating face are engaged with each other, the reliability of the weld is also improved.

[0058] In a second aspect, the application provides a power-using device comprising the battery device in any of the above embodiments.

[0059] The power-using device also has the advantages of the battery device in any of the above embodiments, which will not be repeated here.

[0060] The above description is only a summary of the technical solutions of the application. In order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more apparent and easy to understand, the following specific embodiments of the application are described in detail. BRIEF DESCRIPTION OF DRAWINGS

[0061] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the embodiments. The accompanying drawings are included to provide a description of the embodiments and are not meant to limit the scope of the application. Moreover, the same reference numerals in different drawings represent the same or similar elements. In the drawings:

[0062] Figure 1 A structural schematic diagram of a vehicle in some embodiments of the application;

[0063] Figure 2 An exploded structural schematic diagram of a battery device in some embodiments of the application;

[0064] Figure 3 An exploded structural schematic diagram of a battery cell in some embodiments of the application;

[0065] Figure 4 A perspective structural schematic diagram of a part of a box body in some embodiments of the application;

[0066] Figure 5 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0067] Figure 6 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 5 A partially enlarged view of a part of the structure in G;

[0068] Figure 7 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 6 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0069] Figure 8 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 6 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0070] Figure 9 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0071] Figure 10 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 9 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0072] Figure 11 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0073] Figure 12 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 11 A partially enlarged view of a part of the structure in H;

[0074] Figure 13 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0075] Figure 14 A cross-sectional view of a part of the structure of the case in some embodiments of the present application;

[0076] Figure 15 A cross-sectional view of a part of the structure of the case in some embodiments of the present application; Figure 14 A partially enlarged view of a part of the structure in I.

[0077] Explanation of Reference Numerals:

[0078] Vehicle 1;

[0079] Battery device 10, controller 20, motor 30;

[0080] Battery cell 100, case 110, end cap 120, electrode terminal et, electrode assembly 130;

[0081] Box 200, first part 201, second part 202, box body 210, plate body 211, bottom wall d, first side s1, second side s2, frame body 212, side wall c, mounting hole k, fitting piece 213, plug-in part 213a, abutting part 213b, fitting surface P, second extension surface W2, second edge b2, fourth edge b4, third side edge u3, fourth side edge u4, expansion beam 220, end surface D, first extension surface W1, first edge b1, third edge b3, first side edge u1, second side edge u2, containing space Q, engagement part y, root y1, top edge y2, front edge y3, rear edge y4, connecting surface L;

[0082] First preset angle a1, second preset angle a2, third preset angle a3, interval g;

[0083] First direction F1, second direction F2, third direction F3. DETAILED DESCRIPTION

[0084] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0085] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0086] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly and specifically limited.

[0087] In this paper, "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0088] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0089] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0090] In the description of the embodiments of the present application, the technical 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 indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does 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 a limitation on the embodiments of the present application.

[0091] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0092] At present, from the development of market situation, the application of power battery is more and more extensive. The power battery is not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as military equipment, aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0093] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery device mentioned in the present application can include a battery module or a battery pack, etc.

[0094] The battery device can include a box for packaging one or more battery cells. For example, a plurality of battery cells can be placed in the battery box after being connected in series, in parallel, or in a hybrid manner. For another example, a plurality of battery cells can be placed in the box after being connected in series, in parallel, or in a hybrid manner to form a battery module. During charging and discharging, the embedding and extraction of ions in the active material of the electrode will cause the battery cell to expand and contract accordingly. Ideally, the expansion and contraction of the battery cell caused by the embedding and extraction of ions are reversible, but this ideal situation is difficult to achieve. In actual use, due to changes in the balance of the battery cell, some ions are difficult to extract or deposit on the surface of the anode as insoluble byproducts, causing irreversible expansion of the battery cell. An expansion beam is usually provided in the box, and the battery cell abuts against one side of the expansion beam. In the case that the expansion beam can limit the battery cell, the expansion of the battery cell can be improved to some extent. In addition, by using the box, the influence of liquid or other foreign matter on the charging or discharging of the battery cell can be reduced. That is, the structural reliability of the box can affect the performance of the battery cell, and further affect the reliability of the battery.

[0095] Therefore, in order to further improve the reliability of the battery device, the embodiments of the present application provide a battery device, which improves the reliability of the battery device by improving the structural reliability of the box. Specifically, by improving the structure of the box and the connection mode of the expansion beam, the reliability of the expansion beam is improved, and the reliability of the battery cell is improved, and the reliability of the box is improved. In the case that the reliability of the box and the battery cell is improved, the reliability of the battery is further improved.

[0096] The battery disclosed in the embodiments of the present application can be used in, but is not limited to, an electric device such as a vehicle, a ship, or an aircraft. The power supply system of the electric device can be composed of the battery disclosed in the embodiments of the present application and other components. In this way, the problem of affecting the reliability of the battery due to the reliability of the battery box can be improved.

[0097] The embodiments of the present application provide an electric device using the battery device as a power supply. The electric device is a device that uses electric energy as a source of energy and realizes a corresponding function by consuming electric energy. For example, the electric device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0098] The power consuming device in the embodiments of the present application can include a device body and a power supply device, the power supply device is used to supply power to the device body, and the power supply device can include a battery monomer or a battery pack. The device body refers to the main structure that consumes power to realize corresponding functions. For example, the power consuming device can be a mobile phone, and the device body is the part that can realize communication functions, and the part that can realize communication functions is powered by the battery monomer or the battery pack. For example, the power consuming device can be a car, and the device body is the part that can be used by people to ride and can run on the road, and the part that can be used by people to ride and can run on the road is powered by the battery monomer or the battery pack. The power supply device refers to a device that can output power. For example, the battery pack composed of the battery monomer can output power.

[0099] The following embodiments are described by taking a power consuming device in an embodiment of the present application as a vehicle for example for convenience of description.

[0100] Please refer to Figure 1 , Figure 1 is a schematic structural diagram of a vehicle 1 in some embodiments of the present application. The vehicle 1 can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extended car. The vehicle 1 is internally provided with a battery device 10, which can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1, for example, the battery device 10 can be used as an operating power source of the vehicle 1. The vehicle 1 can also include a controller 20 and a motor 30, and the controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, to meet the power demand of the vehicle 1 during starting, navigation and driving.

[0101] In some embodiments of the present application, the battery device 10 can not only be used as an operating power source of the vehicle 1, but also be used as a driving power source of the vehicle 1, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1.

[0102] In order to meet different power consumption requirements, the battery device 10 can include a plurality of battery monomers 100, and the battery monomer 100 refers to the smallest unit of a battery module or a battery pack. The plurality of battery monomers 100 can be connected in series and / or in parallel via electrode terminals et to be applied to various application occasions. The battery mentioned in the present application includes a battery module or a battery pack. Among them, the plurality of battery monomers 100 can be connected in series or in parallel or in a mixed manner. The mixed connection refers to a mixture of series connection and parallel connection. The battery device 10 can also be referred to as a battery pack. In the embodiments of the present application, the plurality of battery monomers 100 can directly constitute a battery pack, or first constitute a battery module, and then the battery module constitutes a battery pack.

[0103] Please refer to Figure 2 , Figure 2A schematic diagram of an exploded structure of the battery device 10 in some embodiments of the present application. Figure 2 In some embodiments, the battery device 10 can include a plurality of battery modules and a box 200, and the plurality of battery modules are accommodated inside the box 200. The box 200 is used to accommodate the battery monomer 100 to avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomer 100. The box 200 can be a simple cuboid or a cylinder or a sphere or the like, or a complex cuboid composed of a simple cuboid or a cylinder or a sphere or the like, and the embodiments of the present application are not limited thereto. The material of the box 200 can be an alloy material such as an aluminum alloy or a ferrous alloy, a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited thereto.

[0104] In some embodiments, the box 200 can include a first part 201 and a second part 202, and the first part 201 and the second part 202 are mutually covered. The first part 201 and the second part 202 jointly define a space for accommodating the battery monomer 100. The second part 202 can be a hollow structure with one end open, and the first part 201 can be a plate-shaped structure, and the first part 201 covers the open side of the second part 202 to jointly define the space for accommodating the battery monomer 100 with the second part 202. The first part 201 and the second part 202 can also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202.

[0105] The battery module can include a plurality of battery monomers 100, and the plurality of battery monomers 100 can be connected in series or in parallel or in a mixed manner to form a battery module, and a plurality of battery modules are connected in series or in parallel or in a mixed manner to form a battery. In the present application, the battery monomer 100 can include a lithium ion battery, a sodium ion battery or a magnesium ion battery device, and the embodiments of the present application are not limited thereto. The battery monomer 100 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited thereto. The battery monomer 100 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited thereto. However, for the sake of simplicity, the following embodiments will be described by taking the square battery monomer 100 as an example.

[0106] Please refer to Figure 3 , Figure 3 A schematic diagram of an exploded structure of the battery monomer 100 in some embodiments of the present application. The battery monomer 100 refers to the smallest unit that constitutes the battery device 10. As shown in Figure 4 , the battery monomer 100 includes a shell 110, an end cover 120, an electrode assembly 130 and other functional components.

[0107] The shell 110 is a component for cooperating with the end cover 120 to form an internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 130, electrolyte (not shown in the figure) and other components. The shell 110 and the end cover 120 can be independent components, and an opening can be provided on the shell 110, and the end cover 120 is made to cover the opening to form the internal environment of the battery cell 100. Without limitation, the end cover 120 and the shell 110 can also be integrated, specifically, the end cover 120 and the shell 110 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 110, the end cover 120 is made to cover the shell 110. The shell 110 can be various shapes and various sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 110 can be determined according to the specific shape and size of the electrode assembly 130. The material of the shell 110 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations on this. The opening of the shell 110 can be located on the side or bottom of the shell 110, and the embodiments of the present application do not make limitations on this.

[0108] The end cover 120 refers to a component that can be coupled to the opening of the shell 110 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the end cover 120 can be adapted to the shape of the shell 110 to fit the shell 110. Optionally, the end cover 120 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 120 is less likely to deform when subjected to a pressing impact, and the battery cell 100 can have higher structural strength and improved safety performance. The end cover 120 can be provided with functional components such as electrode terminals et. The electrode terminals et can be used to electrically connect with the electrode assembly 130 for outputting or inputting the electric energy of the battery cell 100. In some embodiments, the end cover 120 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value. In some embodiments, the end cover 120 can also be provided with a liquid injection hole for injecting electrolyte into the interior of the battery cell 100. The material of the end cover 120 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 120, which can be used to isolate the electrically connected components in the shell 110 from the end cover 120 to reduce the risk of short circuit. For example, the material of the insulating member can be plastic, rubber, etc. In some embodiments, the shell 110 and / or the end cover 120 can also be provided with a pressure relief mechanism. The pressure relief mechanism is used to relieve the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value, to improve the safety performance of the battery cell 100. The threshold value is different according to different design requirements. The threshold value can depend on the material of one or more of the electrode assembly 130 and the separator in the battery cell 100. The pressure relief mechanism can take the form of a relief valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature of the battery cell 100 reaches the threshold value, the pressure relief mechanism performs an action or the weak structure provided in the pressure relief mechanism is damaged, thereby forming an opening or passage for the internal pressure or temperature to be relieved.

[0109] The electrode assembly 130 is a component in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 130 can be included in the case 110. The electrode assembly 130 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and an insulator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 130, and portions without active materials of the positive electrode sheet and the negative electrode sheet each constitute a tab (not shown in the drawings). The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body, and can be located at the top of the main body or at the side wall of the main body, without being specifically limited here. During charging and discharging of the battery device 10, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal et to form a current loop. The insulator is used to separate the positive electrode sheet and the negative electrode sheet, and to prevent the electrons in the battery cell 100 from freely passing through, so that the ions in the electrolyte can freely flow between the positive electrode sheet and the negative electrode sheet. The insulator can be a thin film made of PE (polyethylene), PP (polypropylene), or the like.

[0110] According to some embodiments of the present application, please continue to refer to Figure 2 , and refer to Figure 4 , Figure 4 is a perspective view of a part of the box in some embodiments of the present application, Figure 4 illustrates the second part 202 of the box 200 in some embodiments described above. Of course, according to actual use requirements, the first part 201 of the box 200 in some embodiments described above can be set as the structure shown in Figure 4 , and the embodiments of the present application do not make specific limitations. Hereinafter, the second part 202 of the box 200 is taken as an example to illustrate the related embodiments.

[0111] As shown in the drawings, in combination with referring to Figure 4 , the first direction F1 is the width direction of the box 200, the second direction F2 is the length direction of the box 200, and the third direction F3 is the height direction of the box 200. The first direction F1, the second direction F2 and the third direction F3 are perpendicular to each other. It can be understood that the first direction F1, the second direction F2 and the third direction F3 are only for the convenience of description, and are not a limitation on the embodiments of the present application. For example, in some other embodiments, the first direction F1 can be the length direction of the box 200, and the second direction F2 can be the width direction of the box 200. The lengths of the box 200 in the first direction F1 and the second direction F2 can be equal or not equal.

[0112] According to some embodiments of the present application, please continue to refer to Figure 4 , and refer toFigure 5 and Figure 6 , Figure 5 is a sectional structure schematic view of a part structure of the box 200 in some embodiments of the present application, Figure 6 is Figure 5 is a local enlarged structure schematic view at G in FIG. 1. The battery device 10 includes a box 200 and a battery cell 100. The box 200 includes a box body 210 and an expansion beam 220, which is arranged in the box body 210 and cooperates with the box body 210 to define a containing space Q. The battery cell 100 is arranged in the containing space Q. The expansion beam 220 has two end faces D oppositely arranged along the longitudinal direction of the expansion beam 220, and the box body 210 has two mating faces P oppositely arranged in one-to-one correspondence with the two end faces D. The end face D and the mating face P are both provided with an engagement part y. The engagement part y on the end face D and the engagement part y on the corresponding mating face P are engaged with each other to limit the degrees of freedom of the expansion beam 220 and the box body 210.

[0113] The box body 210 is a component having a containing cavity. The expansion beam 220 is arranged in the box body 210, that is, the expansion beam 220 is arranged in the containing cavity of the box body 210. Exemplarily, in combination with reference to Figure 4 , the containing cavity has a bottom wall d and a side wall c surrounding the bottom wall d. The material of the box body 210 can take into account a certain rigidity and a certain deformability to meet the use environment inside the battery device 10 and the lightweight requirement. The material of the box body 210 can be a metal such as aluminum, steel, etc. that is relatively easy to process. The box body 210 can be a one-piece structure or a structure assembled in parts. It can be set according to the specific use, which is not specifically limited here.

[0114] The expansion beam 220 is a beam structure for bearing the expansion force of the battery cell 100, which can limit the deformation of the battery cell 100 and inhibit the expansion of the battery cell 100. The expansion beam 220 is generally longitudinal. The arrangement direction and position of the expansion beam 220 can be determined according to the arrangement of the battery cell 100, and the number of the expansion beam 220 can be set according to the use requirement. The battery cell 100 can abut against one side of the expansion beam 220 along the expansion beam 220, or have a gap between the battery cell 100 and the expansion beam 220, as long as the deformation of the battery cell 100 can be limited by the expansion beam 220, which is not specifically limited here. For example, one wall of the largest area of the shell 110 of the battery cell 100 can abut against one side of the expansion beam 220.

[0115] Exemplarily, in combination with reference to Figure 4For example, three expansion beams 220 can be provided, and the three expansion beams 220 are arranged at intervals along the second direction F2. Two expansion beams 220 adjacent along the second direction F2 and the box body 210 define a space, which is the aforementioned accommodation space Q. The battery cell 100 is located in and limited by the accommodation space Q. For example, the longitudinal extension direction of the expansion beam 220 can be parallel to the first direction F1. Figure 4 For example, the longitudinal extension direction of the expansion beam 220 can be parallel to the first direction F1.

[0116] Engagement refers to two surfaces with unevenness on the surfaces, which can be in contact and clamped with each other, so that the relative displacement between the two surfaces is limited, and the freedom of the two surfaces is limited. The engagement portion y refers to the portion on the two surfaces that is engaged, clamped, or closely fitted with each other. For example, referring to Figure 6 , the end face D and the mating face P are uneven, and the protruding portion on the end face D and the mating face P is the engagement portion y. The recessed portion is defined between two adjacent engagement portions y on the same face. For example, a plurality of protruding portions on the end face D can constitute the engagement portion y, and a plurality of recessed portions on the mating face P can define the protruding engagement portion y. Alternatively, a plurality of recessed portions on the end face D can define the protruding engagement portion y, and a plurality of protruding portions on the mating face P can constitute the engagement portion y. As long as the engagement relationship can be formed, the specific limitation is not made herein. For example, referring to Figure 6 For example, a plurality of protruding portions on the end face D constitute the engagement portion y, and a plurality of recessed portions on the mating face P define the protruding engagement portion y. The engagement portion y on the end face D and the engagement portion y on the mating face P are engaged with each other. The remaining portions on the end face D except the engagement portion y and the remaining portions on the mating face P except the engagement portion y can be in abutment with each other.

[0117] Therefore, by providing the engagement portion y on the end face D of the expansion beam 220 at both ends in the longitudinal direction and the mating face P of the box body 210 that cooperates with the end face D, the engagement portion y on the end face D and the engagement portion y on the corresponding mating face P are engaged with each other, and the engagement connection can be formed, the tightness of the connection between the expansion beam 220 and the box body 210 is improved, so that the freedom of the expansion beam 220 and the box body 210 can be limited, and when the battery box 200 is subjected to the relevant force, the risk of loosening or even separation of the expansion beam 220 from the box body 210 can be reduced. Therefore, the reliability of the battery device 10 can be improved.

[0118] According to some embodiments of the present application, please continue to refer to Figure 4 to Figure 6 , and refer to Figure 7 and Figure 8 , Figure 7 For Figure 6 the cross-sectional structure diagram of the partial structure of the box body 200 shown in Figure 8 For Figure 6As shown in the cross-sectional structure schematic view of the partial structure of the expansion beam 220, the box body 210 has a bottom wall d, an end face D and a plurality of engagement portions y arranged on the mating face P. All the engagement portions y on the same face are arranged in a direction away from the bottom wall d.

[0119] The bottom wall d is a wall located at the bottom of the accommodating cavity. The bottom wall d is used to bear the battery monomer 100. In the embodiment of the present application, the direction away from the bottom wall d is the third direction F3.

[0120] Since all the engagement portions y on the same face are arranged in a direction away from the bottom wall d, a plurality of layers of engagement matching structures can be formed in the direction away from the bottom wall d, so that a plurality of layers of structures limiting the movement of the expansion beam 220 can be formed in the direction away from the bottom wall d, thereby limiting the movement of the expansion beam 220 when the battery device 10 is vibrated by external force, and improving the stability and reliability of the connection between the expansion beam 220 and the box body 210.

[0121] According to some embodiments of the present application, please continue to refer to Figure 5 to Figure 8 The engagement portion y has a root y1 connected to the face where the engagement portion y is located, and a top edge y2 spaced from the root y1. The bottom wall d has a first side s1 located in the accommodating space Q, and a second side s2 arranged opposite to the first side s1. For at least part of the engagement portions y on the same mating face P, in the direction from the second side s2 to the first side s1, the orthographic projection of the top edge y2 of the previous engagement portion y on the bottom wall d is closer to the center of the bottom wall d than the orthographic projection of the top edge y2 of the later engagement portion y on the bottom wall d.

[0122] The at least part of the engagement portions y in “for at least part of the engagement portions y on the same mating face P” can be adjacent engagement portions y, or non-adjacent engagement portions y, or both adjacent and non-adjacent engagement portions y. As long as the top edges y2 of the part of the engagement portions y are generally arranged obliquely, it is not limited here. In the embodiment of the present application, the direction from the second side s2 to the first side s1 is the third direction F3. The previous engagement portion y is closer to the bottom wall d than the later engagement portion y.

[0123] In this way, since the top edges y2 of the engagement portions y on the same mating face P are not aligned in the direction from the second side s2 to the first side s1, and the part of the engagement portions y is generally arranged obliquely, the part of the engagement portions y is arranged obliquely, thereby further supporting the expansion beam 220. In this way, both ends of the expansion beam 220 in the longitudinal direction can be further supported, thereby further improving the stability and reliability of the connection between the expansion beam 220 and the box body 210.

[0124] According to some embodiments of the present application, please continue to refer to Figure 5 to Figure 8 , for all the occlusal y located on the same mating surface P, in the direction of the second side s2 pointing to the first side s1, the top edge y2 of the previous occlusal y on the bottom wall d is more close to the center of the bottom wall d than the top edge y2 of the latter occlusal y on the bottom wall d.

[0125] In this way, the occlusal y on the same mating surface P can form multi-layer limiting to the expansion beam 220 while supporting the expansion beam 220 in multiple layers, and together with the two sides of the expansion beam 220 along the longitudinal direction, it forms a support structure that shrinks towards the bottom wall d, which further improves the support of the expansion beam 220, thereby facilitating the stability and reliability of the expansion beam 220 connected to the box body 210.

[0126] According to some embodiments of the present application, please continue to refer to Figure 5 to Figure 8 , the occlusal y has a root y1 connected to the surface where the occlusal y is located, and a top edge y2 spaced from the root y1. The root y1 of the occlusal y and the surface where the occlusal y is located define a leading edge y3 and a trailing edge y4 of the occlusal y. The leading edge y3 is closer to the bottom wall d than the trailing edge y4. Among all the occlusal y located on the same mating surface P, there is a target occlusal. The projection of the leading edge y3 of the target occlusal on the bottom wall d is closer to the center of the bottom wall d than the projection of the trailing edge y4 of the target occlusal on the bottom wall d.

[0127] The top edge y2 of the occlusal y is determined according to the shape of the occlusal y. For example, the top edge y2 of the occlusal y can be a point, a line, or a surface. For example, Figure 7 , the top edge y2 is a line, in the perspective of Figure 7 , the top edge y2 can be regarded as a point; for example, Figure 8 , the top edge y2 is a surface, in the perspective of Figure 8 , the top edge y2 can be regarded as a line. It can be set according to the specific use, which is not specifically limited here. Among the two adjacent occlusal y, the leading edge y3 of one of the occlusal y and the trailing edge y4 of one of the occlusal y can coincide with each other, or can be spaced from each other. For example, Figure 7 , the leading edge y3 of one of the two adjacent occlusal y and the trailing edge y4 of one of the occlusal y are spaced from each other; for example, Figure 8 , the leading edge y3 of one of the two adjacent occlusal y and the trailing edge y4 of one of the occlusal y coincide with each other. It can be set according to the specific use, which is not specifically limited here.

[0128] All the occlusions y on the same mating surface P are target occlusions, that is, at least one of the occlusions y on the same mating surface P is a target occlusion. For example, Figure 7 For example, a case where all the occlusions y on the mating surface P are target occlusions is illustrated.

[0129] In this way, the root y1 of the target occlusion is roughly inclined, so that the root y1 of the target occlusion can be used to support the expansion beam 220, thereby improving the stability and reliability of the connection of the expansion beam 220 to the box body 210.

[0130] According to some embodiments of the present application, please continue to refer to Figure 7 The leading edge y3 of the target occlusion is arranged at a first preset angle a1 with the thickness direction of the bottom wall d in the direction of the trailing edge y4 of the target occlusion. The first preset angle a1 is less than or equal to 5°. For example, the first preset angle a1 can be 5°, 4°, 3°, 2° or 1°. The first preset angle a1 can be any value within the range of less than or equal to 5°, which is not limited herein. In the embodiments of the present application, the thickness direction of the bottom wall d is the third direction F3.

[0131] In this way, by controlling the size of the first preset angle a1, not only can the contact area between the end face D and the corresponding mating surface P be increased, but also the assembly and connection of the box body 210 and the expansion beam 220 can be facilitated.

[0132] According to some embodiments of the present application, please continue to refer to Figure 5 to Figure 8 At least one of the end face D and the mating surface P is defined as a target face, and for all the occlusions y on the same target face, there are two occlusions y arranged adjacent and spaced apart in the direction away from the bottom wall d.

[0133] For example, a case where the mating surface P is the target face is illustrated. Figure 6 to Figure 8

[0134] By arranging the spaced apart occlusions y, the end face D and the corresponding mating surface P can be directly abutted at the spacing, thereby facilitating the expansion beam 220 to be more quickly transmitted to the box body 210 when subjected to external forces, thereby reducing the influence of external forces on the expansion beam 220 and improving the stability and reliability of the expansion beam 220.

[0135] According to some embodiments of the present application, please continue to refer to Figure 5 to Figure 8 On the same target face, between the two occlusions y arranged adjacent and spaced apart in the direction away from the bottom wall d, a connecting surface L is defined. The connecting surface L is configured as a plane.

[0136] For example, a case where the mating surface P is the target face is illustrated.​Figure 6 and Figure 7 For example, the mating surface P is taken as the target surface, and each of the adjacent two occlusal portions y defines a connecting surface L. Specifically, the connecting surface L is connected between the leading edge y3 of one of the occlusal portions y and the side edge of the other occlusal portion y.

[0137] Since the connecting surface L is configured as a plane, it is not only more conducive to supporting the expansion beam 220, but also more conducive to the external force received by the expansion beam 220 being more evenly dispersed on the connecting surface L and more quickly transmitted to the box body 210, thereby improving the stability of the expansion beam 220.

[0138] Of course, in other embodiments, the connecting surface L can also be configured as an arc surface or other surfaces, which are not specifically limited here.

[0139] According to some embodiments of the present application, please continue to refer to Figure 6 and Figure 7 The connecting surfaces L located on the same target surface are provided in plurality. Among all the connecting surfaces L located on the same target surface, there are multiple connecting surfaces L that are parallel to each other; and / or, among all the connecting surfaces L located on the same target surface, there are multiple connecting surfaces L that are located on the same plane.

[0140] Taking the mating surface P as the target surface, there can be multiple connecting surfaces L that are parallel to each other, or multiple connecting surfaces L that are located on the same plane, or multiple connecting surfaces L that are parallel to each other and multiple connecting surfaces L that are located on the same plane. For example, Figure 7 For example, it is illustrated that all the connecting surfaces L on the mating surface P are located on the same plane.

[0141] When the multiple connecting surfaces L are parallel to each other and / or located on the same plane. The multiple connecting surfaces L can support the expansion beam 220 in the same direction, and at the same time, when the expansion beam 220 receives external forces, the external forces can be transmitted to the box body 210 in the same direction, so that the direction of the force transmitted by each of the multiple connecting surfaces L can tend to be consistent, which is conducive to more evenly dispersing stress and improving the situation of stress concentration. In this way, it is not only conducive to assembling and supporting the expansion beam 220, but also conducive to more effectively transmitting the external forces received by the expansion beam 220 to the box body 210.

[0142] According to some embodiments of the present application, please continue to refer to Figure 7The connecting surface L has a starting edge closer to the bottom wall d and a terminal edge farther away from the bottom wall d along the thickness direction of the bottom wall d. The orthogonal projection of the starting edge on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the terminal edge on the bottom wall d. That is, the starting edge and the terminal edge in the same connecting surface L are arranged at an angle with respect to the third direction F3. That is, the connecting surface L is arranged at an angle.

[0143] Therefore, since the connecting surface L is arranged at an angle, and the connecting surfaces L on the two mating surfaces P can form a converging structure that is closer to each other as closer to the bottom wall d, the expansion beam 220 can be further supported by the connecting surface L.

[0144] According to some embodiments of the present application, please continue to refer to Figure 7 The connecting surface L is arranged at a second preset angle a2 with respect to the thickness direction of the bottom wall d, and the second preset angle a2 is less than or equal to 5°. The second preset angle a2 is less than or equal to 5°. For example, the second preset angle a2 can be 5°, 4°, 3°, 2° or 1°. The second preset angle a2 can be any value within the range of less than or equal to 5°, which is not limited herein. In the embodiments of the present application, the thickness direction of the bottom wall d is the third direction F3.

[0145] Therefore, by controlling the size of the second preset angle a2, not only can the contact area between the end surface D and the corresponding mating surface P be increased, which is beneficial for stress conduction and supporting the expansion beam 220, but also facilitates the assembly and connection of the box body 210 and the expansion beam 220.

[0146] According to some embodiments of the present application, please continue to refer to Figure 4 to Figure 8 The box body 210 has a bottom wall d. The end surface D has a first edge b1 away from the bottom wall d and spaced apart from the bottom wall d, and the end surface D includes a first extension surface W1 extending from the first edge b1 towards the bottom wall d. The mating surface P has a second edge b2 away from the bottom wall d and spaced apart from the bottom wall d, and the mating surface P includes a second extension surface W2 extending from the second edge b2 towards the bottom wall d. The first extension surface W1 and the corresponding second extension surface W2 abut each other.

[0147] The first extension surface W1 can be connected to the edge of the corresponding engagement portion y, or can not be adjacent. The second extension surface W2 can also be considered similarly, which is not described herein.

[0148] Since the end face D and the corresponding mating face P can be abutted by means of the first extension face W1 and the second extension face W2 at the edge away from the bottom wall d, that is, no undercut is formed at the edge away from the bottom wall d, it is beneficial for the assembly of the expansion beam 220 and the box body 210, and it is also beneficial for the rapid conduction to the box body 210 when an external force is applied at the edge away from the bottom wall d. In this process, it can be improved that the force acts directly on the undercut y, thereby more beneficially improving the stability and reliability of the expansion beam 220.

[0149] According to some embodiments of the present application, please continue to refer to Figure 6 to Figure 8 The first extension face W1 and the second extension face W2 are both configured as planes.

[0150] Since the first extension face W1 and the second extension face W2 are both configured as planes, it is not only beneficial to realize the abutment of the end face D and the corresponding mating face P, but also beneficial to use the plane to more stably and uniformly disperse stress, so that the overall structure is more stable and reliable.

[0151] Of course, in other embodiments, the first extension face W1 and the second extension face W2 can also be configured as arc surfaces, which are not specifically limited here.

[0152] According to some embodiments of the present application, please continue to refer to Figure 6 to Figure 8 The first extension face W1 has a third edge b3 oppositely arranged with the first edge b1. The orthogonal projection of the third edge b3 on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the first edge b1 on the bottom wall d. The second extension face W2 has a fourth edge b4 oppositely arranged with the second edge b2. The orthogonal projection of the fourth edge b4 on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the second edge b2 on the bottom wall d.

[0153] That is, the direction of the first edge b1 pointing to the third edge b3 is angularly arranged with the third direction F3, so that the first extension face W1 is approximately inclined. The two first extension faces W1 approximately form a structure that the side facing the bottom wall d is close to each other, and the side away from the bottom wall d is far away from each other, which can be approximately regarded as an inverted eight. The direction of the second edge b2 pointing to the fourth edge b4 is angularly arranged with the third direction F3, so that the second extension face W2 is approximately inclined. The two second extension faces W2 approximately form a structure that the side facing the bottom wall d is close to each other, and the side away from the bottom wall d is far away from each other, which can be approximately regarded as an inverted eight.

[0154] In this way, since the first extension face W1 and the second extension face W2 are inclined, it is beneficial to increase the contact area between the end face D and the corresponding mating face P. By controlling the inclination direction of the first extension face W1 and the second extension face W2, a structure capable of supporting the expansion beam 220 is formed, which is beneficial to improve the stability of the expansion beam 220.

[0155] It can be understood that, in the case that the first extension surface W1 and the second extension surface W2 are both configured as a plane and substantially form the aforementioned inverted V-shape structure, if the top side and / or the bottom side of the battery device 10 is subjected to an external force, when the expansion beam 220 has a tendency to move towards the bottom wall d, the expansion beam 220 and the box body 210 can further form a more closely fitted (for example, an interference fit) connection under the guidance of the first extension surface W1. In this way, the connection between the expansion beam 220 and the box body 210 is more reliable.

[0156] According to some embodiments of the present application, please continue to refer to Figure 7 and Figure 8 , the angle between the direction in which the third edge b3 points to the first edge b1 and the thickness direction of the bottom wall d is a third preset angle a3, and the angle between the direction in which the fourth edge b4 points to the second edge b2 and the thickness direction of the bottom wall d is also a third preset angle a3. The third preset angle a3 is less than or equal to 5°. For example, the third preset angle a3 can be 5°, 4°, 3°, 2° or 1°. The third preset angle a3 can be any value within the range of less than or equal to 5°, which is not limited herein. In the embodiments of the present application, the thickness direction of the bottom wall d is the third direction F3.

[0157] In this way, by controlling the size of the third preset angle a3, not only can the contact area of the first extension surface W1 and the corresponding second extension surface W2 be controlled to facilitate the conduction of stress and the support of the expansion beam 220, but also the assembly and connection of the box body 210 and the expansion beam 220 can be facilitated.

[0158] According to some embodiments of the present application, please continue to refer to Figure 6 to Figure 8 , at least one of the end surface D and the mating surface P is defined as a target surface. Two engagement portions y located on the same target surface and adjacent to each other in a direction away from the bottom wall d define a connection surface L. For the same target surface, the orthographic projection of the connection surface L on the bottom wall d is spaced apart from the orthographic projection of the second extension surface W2 closer to the target surface on the bottom wall d.

[0159] For example, in the case of Figure 7 , the mating surface P is the target surface, and the second extension surface W2 closer to the mating surface P is the second extension surface W2 on the mating surface P. It can be understood that, in the case that the end surface D is the target surface, the second extension surface W2 closer to the end surface D is the second extension surface W2 on the mating surface P that cooperates with the end surface D.

[0160] Since the connection surface L and the second extension surface W2 are substantially spaced apart, the engagement portion y can extend longer relative to the second extension surface W2, the strength near the mating surface P can be improved, and thus the support of the box body 210 to the expansion beam 220 can be improved, and the stability and reliability of the expansion beam 220 can be improved.

[0161] According to some embodiments of the present application, please continue to refer to Figure 7 The mating surface P is a target surface. For the same mating surface P, the spacing between the orthographic projection of the connection surface L on the bottom wall d and the orthographic projection of the second extension surface W2 on the bottom wall d is greater than or equal to 3 mm. For example, the spacing can be 3 mm, 4 mm, 6 mm, or 10 mm.

[0162] Specifically, for example, Figure 7 in combination with the content shown in some of the foregoing embodiments, when the second extension surface W2 and the connection surface L are both configured as planes and parallel to each other, the greater the spacing g between the second extension surface W2 and the connection surface L, the longer the engagement portion y extends relative to the second extension surface W2. The size of the spacing g can be determined according to the use case, which is not specifically limited here. The orthographic projection of the spacing g on the bottom wall d is the aforementioned "spacing between the orthographic projection of the connection surface L on the bottom wall d and the orthographic projection of the second extension surface W2 on the bottom wall d". The "spacing between the orthographic projection of the connection surface L on the bottom wall d and the orthographic projection of the second extension surface W2 on the bottom wall d" is determined by the minimum spacing of the "orthographic projection of the connection surface L on the bottom wall d" and the "orthographic projection of the second extension surface W2 on the bottom wall d" in the first direction F1. The size can be determined according to the shapes of the connection surface L and the second extension surface W2, which is not described here.

[0163] In this way, by controlling the spacing between the connection surface L and the second extension surface W2, the box body 210 with different support strengths can be obtained, so as to meet different use requirements.

[0164] According to some embodiments of the present application, please continue to refer to Figure 7 The two engagement portions y located on the same mating surface P and adjacent and spaced apart in a direction away from the bottom wall d define a connection surface L. Among them, for the same mating surface P, the connection surface L and the second extension surface W2 are both configured as planes. The connection surface L and the second extension surface W2 are parallel to each other or located on the same plane; and / or, for the same mating surface P, the orthographic projection of the connection surface L on the bottom wall d is closer to the center of the bottom wall d than the orthographic projection of the second extension surface W2 on the bottom wall d.

[0165] In the case that the connecting surface L and the second extending surface W2 are parallel to each other or located in the same plane, the connecting surface L and the second extending surface W2 can support the expansion beam 220 in the same direction, and at the same time, when the expansion beam 220 is subjected to external force, the external force can be transmitted to the box body 210 in the same direction, so that the direction of the force transmitted by each of the plurality of connecting surfaces L can tend to be consistent, which is beneficial to more evenly disperse stress and improve the situation of stress concentration. In the case that the orthogonal projection of the connecting surface L on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the second extending surface W2 on the bottom wall d, the support performance of the box body 210 to the expansion beam 220 can be improved. In the case that the connecting surface L and the second extending surface W2 are parallel to each other or located in the same plane, and the orthogonal projection of the connecting surface L on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the second extending surface W2 on the bottom wall d, the aforementioned advantages are all possessed.

[0166] In this way, it is not only beneficial to assemble and support the expansion beam 220, but also beneficial to more effectively transmit the external force received by the expansion beam 220 to the box body 210.

[0167] According to some embodiments of the present application, please refer to Figure 9 to Figure 12 , Figure 9 is a perspective structural schematic view of part of the box body 200 in some embodiments of the present application, Figure 10 is Figure 9 is a perspective structural schematic view of the structure shown in Figure 11 is a sectional structural schematic view of part of the box body 200 in some embodiments of the present application, Figure 12 is Figure 11 is a local enlarged structural schematic view of H in The box body 210 includes a plate body 211, a frame body 212 and two cooperating pieces 213.

[0168] The plate body 211 is a component substantially in the shape of a plate. In the case that the plate body 211 constitutes the aforementioned first part 201, the plate body 211 can be regarded as a top wall. For example, Figure 4 and Figure 9 in the case that the plate body 211 constitutes the aforementioned second part 202, the plate body 211 can be regarded as a bottom wall d, and the plate body 211 is used to carry the battery monomer 100. The thickness direction of the plate body 211 is parallel to the third direction F3.

[0169] The frame 212 surrounds the edge of the plate 211 and, together with the plate 211 and the expansion beam 220, defines an accommodating space Q. The material of the frame 212 can balance a certain degree of rigidity and deformability to meet the requirements of the battery's internal operating environment and lightweight design. The material of the frame 212 can be a relatively easy-to-process metal, such as aluminum or steel. The frame 212 can be a one-piece structure or a modular assembly structure. The frame 212 can be constructed using a beam structure.

[0170] Two mounting holes k are provided on the wall surface of the frame 212 facing the receiving space Q. Two mating parts 213 are inserted into the two mounting holes k in a corresponding manner. The side surfaces of the two mating parts 213 facing the receiving space Q correspond to at least a portion of the two mating surfaces P. The material of the mating parts 213 and the frame 212 can be the same or different, and no specific restrictions are imposed here.

[0171] In this way, by setting the mating parts 213, not only can different mating parts 213 be used according to actual usage needs, but it is also beneficial to maintain the housing 200.

[0172] Of course, in some other embodiments of this application, Figure 4 to Figure 6 For example, mating part 213 can also be omitted, and no specific restrictions are imposed here.

[0173] Based on some embodiments of this application, please continue to refer to Figure 10 to Figure 12 and in conjunction with reference Figure 13 , Figure 13 This is a three-dimensional structural diagram of the mating member 213 in some embodiments of this application. The mating member 213 includes an insertion portion 213a and an abutment portion 213b. The insertion portion 213a is inserted into the mounting hole k and has a first surface (not shown) facing the receiving space Q. The abutment portion 213b is located on the side of the first surface away from the plate 211 and abuts against the wall surface of the frame 212 facing the receiving space Q. The first surface and the side surface of the abutment portion 213b facing the receiving space Q constitute at least a portion of the mating surface P.

[0174] For example, with Figure 12 For example, the first surface and the side surface of the abutment portion 213b facing the receiving space Q constitute part of the mating surface P. (Refer to reference...) Figure 9 A portion of the wall surface of the frame 212 facing the receiving space Q (that is, the side wall c of the frame 212 facing the receiving space Q) constitutes another portion of the mating surface P. In other words, a portion of the wall surface of the frame 212 facing the receiving space Q constitutes the second extended surface W2 mentioned in some of the aforementioned embodiments, but it can also be other surfaces. No specific limitations are made here.

[0175] In this way, by arranging the fitting part 213 as the insertion part 213a and the abutting part 213b, not only the installation of the fitting part 213 is facilitated, but also the abutting part 213b can be used to improve the tightness of the connection between the fitting part 213 and the frame 212, thereby facilitating the improvement of the stability of the overall structure.

[0176] According to some embodiments of the present application, please continue to refer to Figure 10 to Figure 13 The tensile strength of the fitting part 213 is greater than the tensile strength of the frame 212.

[0177] In this way, not only the support and connection stability of the expansion beam 220 are improved, but also the light weight of the frame 212 is achieved.

[0178] According to some embodiments of the present application, please continue to refer to Figure 10 to Figure 13 The material of the fitting part 213 includes aluminum alloy.

[0179] For example, the material of the fitting part 213 can be 7-series aluminum alloy, such as 7050 aluminum alloy, 7150 aluminum alloy or 7050 aluminum alloy, which is not limited here.

[0180] In this way, by arranging the material of the fitting part 213 to include aluminum alloy, the fitting part 213 has high strength, thereby facilitating the improvement of the reliability of the connection between the fitting part 213 and the expansion beam 220.

[0181] In some embodiments of the present application, a functional layer made of composite material can also be arranged on the surface of the fitting part 213 to improve the surface performance of the fitting part 213, thereby facilitating the tight fit between the fitting surface P on the fitting part 213 and the corresponding end surface D. Of course, the mechanical properties of the fitting part 213 can also be improved by related heat treatment technology, which is not limited here.

[0182] According to some embodiments of the present application, please continue to refer to Figure 13 , and refer to Figure 14 and Figure 15 , Figure 14 is a schematic view of the three-dimensional structure of the expansion beam 220 in some embodiments of the present application, Figure 15 is a schematic view of the enlarged structure at I in Figure 14 The occlusion part y is arranged longitudinally on the surface where the occlusion part y is located. The longitudinal extension direction of the occlusion part y, the longitudinal direction of the expansion beam 220 and the bearing direction of the box body 210 intersect with each other. The bearing direction of the box body 210 is the direction in which the box body 210 bears the battery monomer 100.

[0183] In the embodiments of the present application, for example Figure 9 to Figure 12 , and refer to Figure 13 to Figure 15The longitudinal extension direction of the interlocking part y is parallel to the second direction F2, the longitudinal direction of the expansion beam 220 is parallel to the first direction F1, and the bearing direction of the box body 210 is the third direction F3. That is, the longitudinal extension direction of the interlocking part y, the longitudinal direction of the expansion beam 220, and the bearing direction of the box body 210 are perpendicular.

[0184] Thus, by setting the interlocking part y as a longitudinal component, the external forces can be distributed more evenly across the frame 212, improving the situation where structural damage is caused by excessive local stress and enhancing the overall load-bearing capacity and stability of the structure. Simultaneously, it exhibits higher stability under external forces and is less prone to deformation or displacement, thereby improving the overall reliability of the structure.

[0185] Based on some embodiments of this application, please continue to refer to Figure 10 , Figure 13 to Figure 15 The longitudinal direction of the expansion beam 220 and the bearing direction of the box body 210 are both perpendicular to the longitudinal extension direction of the interlocking part y.

[0186] For example, with Figure 10 , Figure 13 to Figure 15 For example, the longitudinal direction of the expansion beam 220 is parallel to the first direction F1, the bearing direction of the box body 210 is the third direction F3, and the longitudinal extension direction of the interlocking part y is parallel to the second direction F2.

[0187] In this way, when the expansion beam 220 is subjected to external forces, the lateral force can be transmitted more efficiently through the interlocking part y, which is also conducive to a more uniform distribution of stress.

[0188] Based on some embodiments of this application, please continue to refer to Figure 14 and Figure 15 Along the longitudinal extension direction of the occlusal portion y on the end face D, the end face D has a first side edge u1 and a second side edge u2 that are disposed opposite to each other, and the occlusal portion y on the end face D extends from the first side edge u1 to the second side edge u2.

[0189] In this way, the end face D can be utilized more effectively, allowing it to achieve a tight connection with the corresponding mating surface P through the interlocking part y, thereby increasing the contact area between the end face D and the corresponding mating surface P, and thus improving the overall stability and reliability of the structure.

[0190] Based on some embodiments of this application, please continue to refer to Figure 13 Along the longitudinal extension direction of the occlusal portion y on the mating surface P, the mating surface P has a third side edge u3 and a fourth side edge u4 that are disposed opposite to each other, and the occlusal portion y on the mating surface P extends from the third side edge u3 to the fourth side edge u4.

[0191] In this way, the fitting surface P can be more effectively utilized, the fitting surface P can be tightly connected with the corresponding end surface D by means of the engagement portion y, the contact area of the fitting surface P and the corresponding end surface D is increased, and the stability and reliability of the whole structure are improved.

[0192] According to some embodiments of the present application, please continue to refer to 6 to Figure 8 、 Figure 12 、 Figure 13 and Figure 15 , the engagement portion y has a root y1 connected with the surface where the engagement portion y is located, and a top edge y2 spaced apart from the root y1. In the direction of the root y1 pointing to the top edge y2, the cross-sectional area of the engagement portion y in the direction of the root y1 pointing to the top edge y2 has a decreasing trend.

[0193] The "decreasing trend" means that it can be always decreasing, or first decreasing, then constant, then decreasing, or first constant, then decreasing, etc. As long as the cross-sectional area of the engagement portion y is generally decreasing, it is acceptable.

[0194] In this way, not only is it beneficial to form the engagement structure, but also the flexibility of the connection is improved, and the expansion beam 220 and the box body 210 are convenient to assemble. In addition, by appropriately reducing the cross section of the engagement portion y, the stress can be more evenly distributed between the engagement portions y, and the reliability and stability of the whole connection structure are improved.

[0195] According to some embodiments of the present application, please continue to refer to 6 to Figure 8 、 Figure 12 、 Figure 13 and Figure 15 , in the direction of the root y1 pointing to the top edge y2, the cross-sectional area of the engagement portion y in the direction of the root y1 pointing to the top edge y2 decreases in turn.

[0196] In this way, the cross-sectional area of the engagement portion y has a certain regularity of change, which not only facilitates the manufacture of the engagement portion y and reduces the processing cost, but also further improves the uniformity of stress distribution through the continuously decreasing cross-sectional area.

[0197] According to some embodiments of the present application, please continue to refer to 6 to Figure 8 、 Figure 12 、 Figure 13 and Figure 15 , the profile of the cross section of the engagement portion y in the preset direction includes at least one of a straight line segment and a curved line segment; or the cross-sectional shape of the engagement portion y in the preset direction includes at least one of a triangle, a trapezoid, a rectangle, a semicircle, and a semi-ellipse. The preset direction, the longitudinal direction of the expansion beam 220, and the bearing direction of the box body 210 intersect with each other in pairs. The bearing direction of the box body 210 is the direction in which the box body 210 bears the battery monomer 100.

[0198] For example,Figure 7 For example, the cross-sectional shape of the engagement portion y in the preset direction is triangular. Figure 8 For example, the cross-sectional shape of the engagement portion y in the preset direction is trapezoidal. Figure 7 and Figure 8 In the illustrated cases, the profile of the cross-section of the engagement portion y in the preset direction includes a plurality of straight line segments. In the embodiments of the present application, the preset direction is parallel to the second direction F2, the longitudinal direction of the expansion beam 220 is parallel to the first direction F1, and the bearing direction of the box body 210 is the third direction F3.

[0199] In this way, the engagement portion y can be flexibly constructed according to the use requirements, which is not specifically limited here.

[0200] According to some embodiments of the present application, please continue to refer to Figure 4 to Figure 6 , Figure 9 to Figure 12 The end face D is welded to the corresponding mating surface P.

[0201] For example, the welding process includes at least one of a friction stir welding process and a laser welding process. In this way, the welding quality can be improved by more accurately controlling the heat input, reducing welding deformation and welding defects. After welding is completed, the weld can be heat treated and surface treated to eliminate the residual stress of welding and improve the corrosion resistance of the weld, thereby improving the reliability of the weld.

[0202] In this way, the end face D of the expansion beam 220 and the mating surface P of the frame 212 are connected by welding, which can further improve the connection strength between the expansion beam 220 and the frame 212. Since the engagement portion y located on the end face D and the engagement portion y located on the corresponding mating surface P are engaged with each other, the reliability of the weld is also improved.

[0203] It should be noted that in some of the foregoing embodiments illustrated, the Figure 13 and Figure 15 For example, by providing the engagement portion y, the length of the weld is also increased, which is also beneficial to improve the reliability of the weld. In addition, in some of the above embodiments, the first preset angle α1, the second preset angle α2 and the third preset angle α3 are illustrated. Figure 7 In the structure illustrated in

[0204] According to some embodiments of the present application, the present application also provides a power consumption device, which includes the battery device 10 in any of the above embodiments, and the battery device 10 is used to power the power consumption device. The power consumption device can be any of the devices or systems using the battery device 10.

[0205] According to some embodiments of the present application, please refer to Figure 9 to Figure 15 The battery device 10 provided by the embodiments of the present application includes a box body 210 and an expansion beam 220. The box body 210 includes a plate body 211, a frame body 212, and two matching pieces 213. The frame body 212 is arranged around the edge of the plate body 211 and defines a containing space Q together with the plate body 211 and the expansion beam 220. The plate body 211 constitutes a bottom wall d. Two mounting holes k are arranged on the wall surface of the frame body 212 facing the containing space Q. The two matching pieces 213 are correspondingly inserted into the two mounting holes k. The battery cell 100 is arranged in the containing space Q. The expansion beam 220 has two end faces D oppositely arranged along the longitudinal direction of the expansion beam 220. The box body 210 has two matching faces P oppositely arranged corresponding to the two end faces D. The end face D and the matching face P are both provided with engagement portions y. The engagement portion y on the end face D and the engagement portion y on the corresponding matching face P are engaged with each other to limit the degrees of freedom of the expansion beam 220 and the box body 210. The side surface of the two matching pieces 213 facing the containing space Q constitutes part of the two matching faces P. The end face D and the matching face P are both provided with a plurality of engagement portions y. All the engagement portions y on the same face are arranged along a third direction F3. For all the engagement portions y on the same matching face P, the top edge y2 of the previous engagement portion y is closer to the center of the bottom wall d than the top edge y2 of the latter engagement portion y in the orthogonal projection on the bottom wall d. For all the engagement portions y on the matching face P, the front edge y3 of the engagement portion y is closer to the center of the bottom wall d than the rear edge y4 of the target engagement portion in the orthogonal projection on the bottom wall d. The two adjacent engagement portions y on the same face are spaced from each other along the third direction F3 and define a connecting face L. The engagement portion y is longitudinally arranged along a second direction F2. The end face D has a first edge b1 away from and spaced from the bottom wall d. The end face D includes a first extension face W1 extending from the first edge b1 toward the bottom wall d. The matching face P has a second edge b2 away from and spaced from the bottom wall d. The matching face P includes a second extension face W2 extending from the second edge b2 toward the bottom wall d. The first extension face W1 and the corresponding second extension face W2 abut each other. For the same matching face P, the connecting face L and the second extension face W2 are both configured as planes. The connecting face L and the second extension face W2 are parallel to each other. The orthogonal projection of the connecting face L on the bottom wall d is closer to the center of the bottom wall d than the orthogonal projection of the second extension face W2 on the bottom wall d. The connecting face L and the second extension face W2 are obliquely arranged relative to the third direction F3 at an oblique angle of 5°. The spacing between the connecting face L and the second extension face W2 is greater than 3 mm.

[0206] Of course, in other embodiments of the present application, in combination with the above description Figure 4 to Figure 8The matching piece can also not be arranged, and no specific limitation is made herein.

[0207] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. In particular, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device (10) characterized by, The battery pack comprises: a box body (210) and an expansion beam (220) arranged in the box body (210) and defining a containing space (Q) together with the box body (210); and a battery cell (100) arranged in the containing space (Q); wherein the expansion beam (220) has two end faces (D) oppositely arranged along the longitudinal direction of the expansion beam (220), and the box body (210) has two matching faces (P) oppositely arranged one by one corresponding to the two end faces (D); the end face (D) and the matching face (P) are both provided with a clamping part (y); the clamping part (y) located on the end face (D) and the clamping part (y) located on the corresponding matching face (P) are clamped with each other to limit the degrees of freedom of the expansion beam (220) and the box body (210).

2. The battery device (10) according to claim 1, characterized in that The box body (210) has a bottom wall (d), and the end face (D) and the matching face (P) are both provided with a plurality of clamping parts (y). All the clamping parts (y) located on the same face are arranged in a direction away from the bottom wall (d).

3. The battery device (10) according to claim 2, characterized in that The clamping part (y) has a root (y1) connected with the face where the clamping part (y) is located, and a top edge (y2) spaced apart (g) from the root (y1); the bottom wall (d) has a first side (s1) located in the containing space (Q), and a second side (s2) oppositely arranged from the first side (s1); For at least part of the clamping parts (y) located on the same matching face (P), in a direction from the second side (s2) to the first side (s1), the orthogonal projection of the top edge (y2) of the former clamping part (y) on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthogonal projection of the top edge (y2) of the latter clamping part (y) on the bottom wall (d).

4. The battery device (10) according to claim 3, characterized in that For all the clamping parts (y) located on the same matching face (P), in a direction from the second side (s2) to the first side (s1), the orthogonal projection of the top edge (y2) of the former clamping part (y) on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthogonal projection of the top edge (y2) of the latter clamping part (y) on the bottom wall (d).

5. The battery device (10) according to claim 2, characterized in that The clamping part (y) has a root (y1) connected with the face where the clamping part (y) is located, and a top edge (y2) spaced apart (g) from the root (y1); the root (y1) of the clamping part (y) and the face where the clamping part (y) is located define a leading edge (y3) and a trailing edge (y4) of the clamping part (y); the leading edge (y3) is closer to the bottom wall (d) than the trailing edge (y4); There is a target clamping part among all the clamping parts (y) located on the same matching face (P); The orthogonal projection of the leading edge (y3) of the target clamping part on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthogonal projection of the trailing edge (y4) of the target clamping part on the bottom wall (d).

6. The battery device (10) according to claim 5, characterized in that A front edge (y3) of the target occlusal portion is arranged in a direction pointing to a rear edge (y4) of the target occlusal portion, and is arranged at a first preset angle (α1) with the thickness direction of the bottom wall (d); the first preset angle (α1) is less than or equal to 5°.

7. The battery device (10) according to claim 2, characterized in that At least one of the end face (D) and the mating face (P) is defined as a target face; for all the occlusal portions (y) located on the same target face, there are two adjacent and spaced (g) occlusal portions (y) in a direction away from the bottom wall (d).

8. The battery device (10) according to claim 7, characterized in that Between two adjacent and spaced (g) occlusal portions (y) located on the same target face and in a direction away from the bottom wall (d), a connecting face (L) is defined; the connecting face (L) is configured as a plane.

9. The battery device (10) according to claim 8, characterized in that The connecting face (L) located on the same target face is provided with a plurality of Among all the connecting faces (L) located on the same target face, there are a plurality of connecting faces (L) parallel to each other; and / or Among all the connecting faces (L) located on the same target face, there are a plurality of connecting faces (L) located on the same plane.

10. The battery device (10) according to claim 8, characterized in that In the thickness direction of the bottom wall (d), the connecting face (L) has a starting edge closer to the bottom wall (d), and a terminal edge farther away from the bottom wall (d); The orthographic projection of the starting edge on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthographic projection of the terminal edge on the bottom wall (d).

11. The battery device (10) according to claim 10, characterized in that The connecting face (L) is arranged at a second preset angle (α2) with the thickness direction of the bottom wall (d), and the second preset angle (α2) is less than or equal to 5°.

12. The battery device (10) according to any one of claims 1-11, characterized in that The box body (210) has a bottom wall (d); The end face (D) has a first edge (b1) away from and spaced from the bottom wall (d), and the end face (D) includes a first extension face (W1) extending from the first edge (b1) towards the bottom wall (d); The mating face (P) has a second edge (b2) away from and spaced from the bottom wall (d), and the mating face (P) includes a second extension face (W2) extending from the second edge (b2) towards the bottom wall (d); The first extension face (W1) and the corresponding second extension face (W2) abut each other.

13. The battery device (10) according to claim 12, characterized in that The first extension face (W1) and the second extension face (W2) are both configured as planes.

14. The battery device (10) according to claim 12, characterized in that The first extension face (W1) has a third edge (b3) arranged opposite to the first edge (b1); the orthographic projection of the third edge (b3) on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthographic projection of the first edge (b1) on the bottom wall (d); The second extension face (W2) has a fourth edge (b4) arranged opposite to the second edge (b2); the orthographic projection of the fourth edge (b4) on the bottom wall (d) is closer to the center of the bottom wall (d) than the orthographic projection of the second edge (b2) on the bottom wall (d).

15. The battery device (10) according to claim 14, characterized in that The third edge (b3) is directed at an angle to the thickness direction of the bottom wall (d) in the direction of the first edge (b1), and the fourth edge (b4) is directed at an angle to the thickness direction of the bottom wall (d) in the direction of the second edge (b2), both angles being a third preset angle (a3); The third preset angle (a3) is less than or equal to 5°.

16. The battery device (10) according to claim 12, characterized in that At least one of the end face (D) and the mating face (P) is defined as a target face; Two adjacent and spaced occlusions (y) on the same target face define a connecting face (L) in the direction away from the bottom wall (d); For the same target face, the connecting face (L) on the bottom wall (d) and the second extension face (W2) on the bottom wall (d) are spaced apart.

17. The battery device (10) according to claim 16, characterized in that The mating face (P) is the target face; for the same mating face (P), the distance between the connecting face (L) on the bottom wall (d) and the second extension face (W2) on the bottom wall (d) is greater than or equal to 3mm.

18. The battery device (10) according to claim 12, characterized in that Two adjacent and spaced occlusions (y) on the same mating face (P) define a connecting face (L) in the direction away from the bottom wall (d); Wherein, for the same mating face (P), the connecting face (L) and the second extension face (W2) are both configured as planes; the connecting face (L) and the second extension face (W2) are parallel to each other or located in the same plane; and / or For the same mating face (P), the connecting face (L) on the bottom wall (d) is closer to the center of the bottom wall (d) than the second extension face (W2) on the bottom wall (d).

19. The battery device (10) according to any one of claims 1-11, characterized by The box body (210) comprises: a plate body (211); a frame body (212) surrounding the edge of the plate body (211) and defining the containing space (Q) with the plate body (211) and the expansion beam (220); the frame body (212) is provided with two mounting holes (k) on the wall surface facing the containing space (Q); and two matching pieces (213) are inserted into the two mounting holes (k) one by one; the side surface of the two matching pieces (213) facing the containing space (Q) one by one constitutes at least part of the two mating faces (P).

20. The battery device (10) according to claim 19, characterized in that The matching piece (213) comprises a plug-in part (213a) and an abutting part (213b); The plug-in part (213a) is inserted into the mounting hole (k), and the plug-in part (213a) has a first surface facing the containing space (Q); the abutting part (213b) is provided on the side of the first surface away from the plate body (211) and abuts against the wall surface of the frame body (212) facing the containing space (Q); The first surface and the side surface of the abutting part (213b) facing the containing space (Q) constitute at least part of the mating face (P).

21. The battery device (10) according to claim 19, characterized in that The tensile strength of the fitting part (213) is greater than the tensile strength of the frame body (212); and / or The material of the fitting part (213) comprises an aluminum alloy.

22. The battery device (10) according to any one of claims 1-11, characterized by The engagement portion (y) is longitudinally arranged on the surface where the engagement portion (y) is located. The longitudinal extension direction of the engagement portion (y), the longitudinal direction of the expansion beam (220), and the bearing direction of the box body (210) intersect with each other; the bearing direction of the box body (210) is the direction in which the box body (210) bears the battery monomer (100).

23. The battery device (10) according to claim 22, characterized in that The longitudinal direction of the expansion beam (220) and the bearing direction of the box body (210) are both perpendicular to the longitudinal extension direction of the engagement portion (y); and / or Along the longitudinal extension direction of the engagement portion (y) on the end surface (D), the end surface (D) has oppositely arranged first and second side edges (u1) and (u2), and the engagement portion (y) on the end surface (D) is arranged from the first side edge (u1) to the second side edge (u2); and / or Along the longitudinal extension direction of the engagement portion (y) on the fitting surface (P), the fitting surface (P) has oppositely arranged third and fourth side edges (u3) and (u4), and the engagement portion (y) on the fitting surface (P) is arranged from the third side edge (u3) to the fourth side edge (u4).

24. The battery device (10) according to any one of claims 1-11, characterized by The engagement portion (y) has a root portion (y1) connected to the surface where the engagement portion (y) is located, and a top edge (y2) spaced apart from the root portion (y1); In the direction of the root portion (y1) pointing to the top edge (y2), the cross-sectional area of the engagement portion (y) in the direction of the root portion (y1) pointing to the top edge (y2) shows a decreasing trend.

25. The battery device (10) according to claim 24, characterized in that In the direction of the root portion (y1) pointing to the top edge (y2), the cross-sectional area of the engagement portion (y) in the direction of the root portion (y1) pointing to the top edge (y2) decreases in turn.

26. The battery device (10) according to claim 24, characterized in that The profile of the cross section of the engagement portion (y) in a predetermined direction includes at least one of a straight line segment and a curved line segment; or The cross-sectional shape of the engagement portion (y) in a predetermined direction includes at least one of a triangle, a trapezoid, a rectangle, a semicircle, and a semi-ellipse. The predetermined direction, the longitudinal direction of the expansion beam (220), and the bearing direction of the box body (210) intersect with each other; the bearing direction of the box body (210) is the direction in which the box body (210) bears the battery monomer (100).

27. The battery device (10) according to any one of claims 1-11, characterized by The end surface (D) and the corresponding fitting surface (P) are welded together.

28. An electrical device, comprising: The battery device (10) as claimed in any one of claims 1-27. The battery device (10) as claimed in any one of claims 1-27.

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