Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment. The battery device comprises a first plate body, a battery cell and a second plate body, the battery cell is arranged on one side of the first plate body in the thickness direction and extends in the first direction, and the first direction is perpendicular to the thickness direction; the second plate body is connected to one side of the first plate body in the thickness direction, a first cavity is formed between the second plate body and the first plate body along at least one end of the first direction, and on a plane perpendicular to the thickness direction, the orthographic projection of the first cavity is at least partially overlapped with the orthographic projection of the end part of the battery cell. According to the battery device, the orthographic projection of the first cavity on the first plate body is at least partially overlapped with the orthographic projection of the end part of the battery cell, so that the stress of the end part of the battery cell can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to a battery device and an electrical equipment. Background Art

[0002] In the related art, the battery cells of the battery device are usually installed on a tray. When the battery device moves with the electrical equipment, the stress on the ends of the battery cells is relatively large, which can easily cause damage to the battery cells.

[0003] Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Utility Model Content

[0004] One object of the utility model is to provide a new technical solution for a battery device.

[0005] According to a first aspect of the present utility model, a battery device is provided. The battery device comprises:

[0006] A first plate body;

[0007] A battery cell, the battery cell is arranged on one side of the first plate in a thickness direction and extends along a first direction, the first direction being perpendicular to the thickness direction;

[0008] A second plate body connected to one side of the first plate body in the thickness direction, and having a first cavity between the second plate body and the first plate body along at least one end of the first direction;

[0009] On a plane perpendicular to the thickness direction, an orthographic projection of the first cavity at least partially overlaps with an orthographic projection of an end of the battery cell.

[0010] Optionally, along the first direction, the length of the overlapping portion of the orthographic projection of the first cavity and the orthographic projection of the end of the battery cell is L1, and the length of the battery cell is L2, satisfying: the ratio of L1 to L2 is 0.8% to 8%.

[0011] Optionally, the length of the battery core covered by the orthographic projection of the first cavity is L1, which satisfies: 8mm≤L1≤50mm.

[0012] Optionally, a reinforcement member is provided in the first cavity.

[0013] Optionally, the reinforcement comprises a corrugated sheet, and the corrugated sheet extends along the first direction or along a second direction, and the second direction is perpendicular to the first direction and the thickness direction respectively.

[0014] Optionally, the reinforcement member is a foam member.

[0015] Optionally, a recess is provided at at least one end of the second plate body along the first direction, and the recess and the first plate body define the first cavity.

[0016] Optionally, it also includes a first side panel and a second side panel, along the first direction, the first side panel is connected to the end of the first plate body, the second side panel is connected to the end of the second plate body, there is a second cavity between the first side panel and the second side panel, and the second cavity is connected to the first cavity.

[0017] Optionally, along the first direction, one end of the first side plate away from the first plate body is connected to a first side edge; one end of the second side plate away from the second plate body is connected to a second side edge, and the first side edge and the second side edge are fixedly connected.

[0018] Optionally, the first plate body, the first side plate, and the first side edge are an integrally formed part, and / or the second plate body, the second side plate, and the second side edge are an integrally formed part.

[0019] Optionally, a reinforcing rib is provided at a connection between the first side panel and the first panel body.

[0020] Optionally, a flow channel is provided between the first plate body and the second plate body, and the flow channel is located at one side of the first cavity.

[0021] Optionally, along the first direction, the second plate body has the first cavity between both ends of the first plate body, and the flow channel is located between the first cavities.

[0022] Optionally, an insulating member is further included, wherein the insulating member is arranged on the first plate body, and along the first direction, the insulating member corresponds to the end of the battery cell.

[0023] According to a second aspect of the utility model, an electric device is provided, which includes the battery device described in the above embodiment.

[0024] A technical effect of the present application is that the second plate body is connected to one side of the first plate body in the thickness direction, and a first cavity is provided between the first plate body and the second plate body along at least one end of the first direction. The battery cell is arranged on one side of the thickness direction of the first plate body and extends along the first direction, and the orthographic projection of the first cavity at least partially overlaps with the orthographic projection of the end of the battery cell, thereby reducing the stress at the end of the battery cell.

[0025] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0027] Figure 1 It is a schematic diagram of the structure of the battery device according to an embodiment of the present application.

[0028] Figure 2 is a top view of a battery device according to an embodiment of the present application.

[0029] Figure 3 yes Figure 2 A cross-sectional view taken along AA is shown.

[0030] Figure 4 yes Figure 3 An enlarged view of point B is shown.

[0031] Reference numerals:

[0032] 1. First plate body; 2. Second plate body; 21. Recess; 3. First cavity; 4. Battery cell; 5. Reinforcement member; 6. First side plate; 7. Second side plate; 8. Second cavity; 9. Reinforcement rib; 10. Flow channel; 11. Insulation member; 12. First side edge; 13. Second side edge. DETAILED DESCRIPTION

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0035] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0036] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0037] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] According to one embodiment of the present application, a battery device is provided. Figure 1 and Figure 4As shown, the battery device comprises: a first plate body 1, a battery cell 4 and a second plate body 2. The battery cell 4 is arranged on one side of the first plate body 1 in the thickness direction and extends along a first direction, wherein the first direction is perpendicular to the thickness direction. The second plate body 2 is connected to one side of the first plate body 1 in the thickness direction, and a first cavity 3 is provided between the second plate body 2 and the first plate body 1 along at least one end of the first direction. In particular, on a plane perpendicular to the thickness direction, the orthographic projection of the first cavity 3 at least partially overlaps with the orthographic projection of the end of the battery cell 4.

[0039] In this example, the battery cell 4 is arranged on one side of the first plate body 1 along the thickness direction, and along at least one end in the first direction, there is a first cavity 3 between the first plate body 1 and the second plate body 2. The battery device of the present application can reduce the stress at the end of the battery cell 4 by at least partially overlapping the orthographic projection of the first cavity 3 with the orthographic projection of the end of the battery cell 4.

[0040] like Figure 2 As shown, the first plate body 1 may be a rectangular structure, and the first direction may be the length direction of the first plate body 1 or the width direction of the first plate body 1 . In this application, the width direction of the first plate body 1 is referred to as the first direction.

[0041] In this example, the side of the first plate body 1 facing away from the second plate body 2 is set as a mounting surface, and there are multiple battery cells 4, which are arranged along the length direction of the first plate body 1 and bonded to the mounting surface. Along one end of the first direction, the first cavity 3 is a cavity channel between the first plate body 1 and the second plate body 2, so that the cavity channel can correspond to the multiple battery cells 4. That is, on a plane perpendicular to the thickness direction, the orthographic projection of the cavity channel can cover the orthographic projection of the ends of all battery cells 4, thereby reducing the end stress of the multiple battery cells 4 to increase the service life of the battery cells 4. Among them, the battery cells 4 can be fixed to the side of the first plate body 1 facing away from the second plate body 2 by adhesive bonding.

[0042] For example, the battery device can be used to power a vehicle, and the first cavity 3 can effectively reduce the stress generated at the end of the battery cell 4 when the vehicle is running.

[0043] In this example, the first plate body 1 and the second plate body 2 can be connected by bonding or welding. For example, there is a first cavity 3 between the first plate body 1 and the second plate body 2, and the other parts are in contact and connected by welding. Those skilled in the art can determine according to actual conditions, and no specific limitation is made here.

[0044] The first plate body 1 and the second plate body 2 may be made of copper, nickel, aluminum or alloy materials thereof, which can improve the thermal conductivity of the plates to facilitate heat dissipation of the battery core 4 .

[0045] In this example, the first cavity 3 is provided between the first plate 1 and the second plate 2 at both ends along the first direction. That is, there are two first cavities 3 between the first plate 1 and the second plate 2, respectively corresponding to the opposite ends of the battery cell 4. That is, the orthographic projections of the two first cavities 3 can respectively overlap with the orthographic projections of the two ends of the battery cell 4 at least partially, so as to reduce the stress at both ends of the battery cell 4. For example, the orthographic projection of the first cavity 3 can completely cover the orthographic projection of the end of the battery cell 4.

[0046] In an example, Figure 4 As shown, along the first direction, the length of the overlapping part of the orthographic projection of the first cavity 3 and the orthographic projection of the end of the battery cell 4 is L1, and the length of the battery cell 4 is L2, satisfying: the ratio of L1 to L2 is 0.8% to 8%.

[0047] In this example, the length of the overlapping part of the projection of the first cavity 3 and the orthographic projection of the end of the battery cell 4 is L1, and the length of the battery cell 4 along the first direction is L2. Then the ratio of L1 to L2 ranges from 0.8% to 8%. It can not only ensure that the projection of the first cavity 3 covers the end of the battery cell 4 and reduce the stress at the end of the battery cell 4, but also make the contact area between the first plate 1 and the second plate 2 larger and improve stability. At the same time, due to the limitation of the cavity formation process, the ratio of L1 to L2 needs to be greater than or equal to 0.8%, and in order to ensure the connection strength of the first plate 1 and the second plate 2 and thus ensure the overall strength of the battery device, the ratio of L1 to L2 needs to be less than or equal to 8%. It can be understood that a flow channel 10 can also be set between the first plate 1 and the second plate 2 for cooling the battery cell 4. In order to ensure the cooling effect of the flow channel 10, the ratio of L1 to L2 needs to be less than or equal to 8%. For example, the ratio of L1 to L2 can be 0.8%, 1%, 3%, 5% or 8%, etc., and those skilled in the art can determine it according to the actual situation, and it is not specifically limited here.

[0048] Among them, Figure 4 As shown, in actual measurement, along the first direction, the straight-line distance from the innermost side of the first cavity 3 to the end of the battery cell 4 is the value of L1. Alternatively, along the first direction, the value of L1 may also be the straight-line distance from the innermost side of the uniformly spaced section of the first cavity 3 to the end of the battery cell 4. The straight-line distance described here does not include the length of the pole at the end of the battery cell 4.

[0049] In an example, the length L1 of the orthographic projection of the first cavity 3 covering the battery core 4 satisfies: 8 mm ≤ L1 ≤ 50 mm.

[0050] The length of the orthographic projection of the first cavity 3 on the first plate 1 covering the battery cell 4 is set to L1. The range of L1 is 8mm to 50mm, which can not only ensure that the projection of the first cavity 3 covers the end of the battery cell 4 and reduce the stress at the end of the battery cell 4, but also make the contact area between the first plate 1 and the second plate 2 larger and improve stability. At the same time, limited by the formation process of the cavity, L1 needs to be greater than or equal to 8mm, and in order to ensure the connection strength of the first plate 1 and the second plate 2 and thus ensure the overall strength of the battery device, L1 needs to be less than or equal to 50mm. It is understandable that a flow channel 10 can also be set between the first plate 1 and the second plate 2 for cooling the battery cell 4. In order to ensure the cooling effect of the flow channel 10, L1 is less than or equal to 50mm. Among them, the value of L1 can be 8mm, 10mm, 20mm, 30mm, 40mm, or 50mm, etc. Those skilled in the art can determine according to actual conditions, and no specific limitation is made here.

[0051] In this example, the length of the projection of the first cavity 3 on the first plate body 1 is slightly larger than L1 , so as to accommodate the installation error of the battery cell 4 .

[0052] In an example, Figures 2 to 4 As shown, a reinforcing member 5 is provided in the first cavity 3. Providing the reinforcing member 5 in the first cavity 3 can improve the overall strength and rigidity of the battery device. When the battery device is used in a vehicle, the torsional rigidity of the battery system can be improved when the vehicle is driving.

[0053] In this example, the reinforcement member 5 includes a corrugated sheet, and the corrugated sheet extends along the first direction or along a second direction, and the second direction is perpendicular to the first direction and the thickness direction, respectively.

[0054] like Figure 2 As shown, the second direction is respectively perpendicular to the first direction and the thickness direction. For example, the first direction is the width direction of the first plate body 1 , and the second direction is the length direction of the first plate body 1 .

[0055] The reinforcement 5 is a corrugated sheet, which is filled in the first cavity 3, and the two ends of the corrugated sheet are respectively connected to the first plate body 1 and the second plate body 2 to improve the overall strength of the first plate body 1 and the second plate body 2. The corrugated sheet extends along the first direction or along the second direction so that the corrugated sheet fills the first cavity 3. The reinforcement may also be a structure such as honeycomb aluminum.

[0056] Alternatively, the reinforcing member 5 may also be a foamed member, which is filled in the first cavity 3. Alternatively, the reinforcing member 5 may also be a filler of other types or materials, such as a polypropylene foamed member, a rubber foamed member, etc. It may also be a metal foamed member, such as foamed aluminum, a foamed aluminum alloy, etc. Those skilled in the art may determine the method according to actual conditions, and no specific limitation is made here.

[0057] In an example, Figure 2 and Figure 4 As mentioned above, at least one end of the second plate body 2 along the first direction is provided with a recess 21 , and the recess 21 and the first plate body 1 define the first cavity 3 .

[0058] The second plate body 2 is provided with a recess 21 at at least one end along the first direction. For example, the first plate body 1 has a recess 21 at one end in the first direction, and the first plate body 1 and the recess 21 define a first cavity 3. Alternatively, recesses are provided at both ends in the first direction, and the first plate body 1 and the recess 21 can define two second cavities 8.

[0059] In this example, the first plate body 1 is located at the open end of the recess 21. After the first plate body 1 is connected to the second plate body 2, the first plate body 1 and the recess 21 can define a first cavity 3. By providing the recess 21 on the second plate body 2, the first plate body 1 can be kept flat, so as to facilitate the installation of the battery cell 4.

[0060] For example, a groove that is recessed away from the first plate body 1 is provided on one side of the second plate body 2. The first plate body 1 can form a first cavity 3 with the groove.

[0061] In an example, Figure 2 and Figure 4 As shown, the battery device further includes a first side plate 6 and a second side plate 7. Along the first direction, the first side plate 6 is connected to the end of the first plate body 1. The second side plate 7 is connected to the end of the second plate body 2, and a second cavity 8 is provided between the first side plate 6 and the second side plate 7, and the second cavity 8 is connected to the first cavity 3.

[0062] like Figure 2 and Figure 4 As shown, in this example, the battery device further includes a first side plate 6 and a second side plate 7. Along the first direction, the first side plate 6 is connected to the end of the first plate body 1. The second side plate 7 is connected to the end of the second plate body 2. A second cavity 8 is provided between the second side plate 7 and the first side plate 6. The second cavity 8 is connected to the first cavity 3, and the second cavity 8 is located on one side of the first cavity 3. The battery device of the present application can further reduce the stress at the end of the battery cell 4 by providing the second cavity 8.

[0063] In this example, there is a distance between the first side plate 6 and the second side plate 7 to form a second cavity 8 .

[0064] In this example, if Figures 2 to 4As shown, the first side panels 6 have two, which are respectively connected to the two ends of the first plate body 1, and the first side panels 6 and the first plate body 1 form a bending structure. The second side panels 7 have two, which are respectively connected to the two ends of the second plate body 2, and the second side panels 7 and the second plate body 2 form a bending structure. The bending directions of the first side panels 6 and the second side panels 7 are consistent, so that a second cavity 8 is formed between the first side panels 6 and the second side panels 7.

[0065] Among them, Figure 2 As shown, the cross-section of the first side plate 6 and the second side plate 7 may be a curved structure. Alternatively, the first side plate 6 and the second side plate 7 may also be a straight plate structure. Those skilled in the art may determine according to actual conditions, and no specific limitation is made here.

[0066] In this example, the first side panel 6 can be formed integrally with the first plate body 1. That is, the first side panel 6 is formed by a bending process at one end of the first plate body 1. By forming the first side panel 6 integrally with the first plate body 1, the stability of the connection between the first side panel 6 and the first plate body 1 can be improved. The second side panel 7 can also be formed integrally with the second plate body 2.

[0067] In this example, a third side panel is further provided on both sides adjacent to the first side panel 6. The third side panel is connected to one end of the first plate body 1. That is, the first plate body 1 is a rectangular structure, and the first side panel 6 and the third side panel are alternately connected to the four sides. The third side panel can be integrally formed with the first plate body 1 and the first side panel 6. The third side panel and the first plate body 1 form a bent structure.

[0068] like Figure 2 and Figure 4 As shown, in this example, along the first direction, one end of the first side plate 6 away from the first plate body 1 is connected to a first side edge 12. One end of the second side plate 7 away from the second plate body 2 is connected to a second side edge 13. The first side edge 12 and the second side edge 13 are fixedly connected.

[0069] For example, the first side edge 12 can be bonded, welded or screwed to the second side edge 13 so that the first side edge 12 is fixedly connected to the second side edge 13 and a second cavity 8 can be formed between the first side plate 6 and the second side plate 7 .

[0070] The first side edge 12 and the first side panel 6 can be integrally formed. That is, the first side edge 12 is formed at one end of the first side panel by a bending process. By integrally forming the first side panel 6 and the first side edge 12, the stability of the connection between the first side panel 6 and the first side edge 12 can be improved. The second side panel 7 and the second side edge 13 can also be integrally formed.

[0071] like Figure 2As shown, the first side edge 12 can be arranged parallel to the first board body 1, and the second side edge 13 is bonded to one side of the first side edge 12. The first side edge 12 and the second side edge 13 can be used to connect to a packaging structure, etc.

[0072] like Figure 1 As shown, in this example, the first side plates 6 are connected to the two opposite sides of the first plate body 1. The second side plates 7 are connected to the two opposite sides of the second plate body 2. That is, the second cavities are correspondingly arranged on the two opposite sides of the first plate body 1.

[0073] In one example, the first plate body 1, the first side plate 6, and the first side edge 12 are an integrally formed part. And / or, the second plate body 2, the second side plate 7, and the second side edge 13 are an integrally formed part.

[0074] In this example, the first plate body 1, the first side plate 6, and the first side edge 12 are integrally formed. That is, the plate body can be bent by a bending process to form the first plate body 1, the first side plate 6, and the first side edge 12. The integral molding process is simple and can improve the stability of the connection between the first plate body 1, the first side plate 6, and the first side edge 12.

[0075] Furthermore, the second plate body 2 , the second side plate 7 , and the second side edge 13 may also be an integrally formed part.

[0076] Of course, the first plate body 1, the first side plate 6, and the first side edge 12 can also be connected by welding. Also, the second plate body 2, the second side plate 7, and the second side edge 13 can also be connected by welding. Alternatively, the connection can be made by other fixing methods, which can be determined by those skilled in the art according to the actual situation and is not specifically limited here.

[0077] In an example, Figure 1 As shown, a reinforcing rib 9 is provided at the connection between the first side plate 6 and the first plate body 1. By providing the reinforcing rib 9 at the connection between the first side plate 6 and the first plate body 1, the structural strength of the first side plate 6 can be improved, and the connection strength between the first side plate 6 and the first plate body 1 can be improved, thereby improving the overall strength of the battery device.

[0078] Among them, a plurality of reinforcing ribs 9 can be provided, and a plurality of reinforcing ribs 9 are arranged at intervals on the first side plate 6 to further improve the strength of the first side plate 6. For example, three, four, five or six reinforcing ribs 9 can be provided, and those skilled in the art can determine according to actual conditions, and no specific limitation is made here.

[0079] In an example, the reinforcing rib 9 includes a stepped reinforcing rib 9 , and the reinforcing rib 9 is protruding in a direction away from the second side plate 7 .

[0080] In this example, the reinforcing ribs 9 can be set as a stepped structure, and the reinforcing ribs 9 of the stepped structure are protruding in the direction away from the second side plate 7 to improve the structural strength of the first side plate 6. Of course, the reinforcing ribs 9 can also be structures of other shapes, as long as they can strengthen the structural strength of the first side plate 6. Those skilled in the art can determine according to actual conditions, and no specific limitation is made here.

[0081] In an example, Figure 3 and Figure 4 As shown, a flow channel 10 is provided between the first plate body 1 and the second plate body 2 , and the flow channel 10 is located at one side of the first cavity 3 .

[0082] like Figure 3 and Figure 4 As shown, in this example, a flow channel 10 may be further provided between the first plate body 1 and the second plate body 2. The flow channel 10 is used to transport cooling liquid to dissipate heat from the battery core 4. The flow channel 10 is located at one side of the first cavity 3.

[0083] For example, a groove may be provided on the first plate 1, and the second plate 2 may be welded to the first plate 1, and the second plate 2 and the groove may form a flow channel 10. A plurality of flow channels 10 may be provided to improve the heat dissipation effect of the battery cell 4.

[0084] In this example, along the first direction, the first cavities 3 are provided between both ends of the second plate body 2 and the first plate body 1, and the flow channel 10 is located between the first cavities 3. There are multiple flow channels 10, and the multiple flow channels 10 are arranged between the two first cavities 3 to improve the heat dissipation effect on the battery cell 4.

[0085] In an example, Figure 1 and Figure 2 As shown, the battery device further includes an insulating member 11, and the insulating member 11 is disposed on the first plate body 1. Along the first direction, the insulating member 11 corresponds to the end of the battery cell 4.

[0086] like Figure 1 and Figure 2 As shown, the insulating member 11 is connected to the first plate 1, along the first direction, corresponding to the end position of the battery cell 4, so as to improve the insulation protection between the battery cell 4 and the first plate 1. The insulating member 11 is bonded to the first plate 1, and the end position of the battery cell 4 can be bonded to the insulating member 11.

[0087] In this example, insulating members 11 are provided on both sides of the first plate 1 along the first direction, and the battery cells 4 are bonded to the insulating members 11 along both ends to improve insulation protection between the battery cells 4 and the first plate 1 .

[0088] The insulating member 11 may be a PI film (polyimide film) with good insulation. The PI film may be connected to the first plate 1 by hot pressing or bonding. Of course, the insulating member 11 may also be other insulating materials, for example, the insulating member 11 may be other insulating plastics or silica gel, and those skilled in the art may determine the material according to the actual situation, and no specific limitation is made here.

[0089] According to another embodiment of the utility model, an electric device is provided. The electric device comprises the battery device described in the above embodiment. The battery device can be used to supply power to the electric device.

[0090] In this example, the battery device includes: a first plate body 1, a battery cell 4 and a second plate body 2. The battery cell 4 is arranged on one side of the first plate body 1 in the thickness direction and extends along a first direction, wherein the first direction is perpendicular to the thickness direction. The second plate body 2 is connected to one side of the first plate body 1 in the thickness direction, and a first cavity 3 is provided between the second plate body 2 and the first plate body 1 along at least one end of the first direction. Among them, on a plane perpendicular to the thickness direction, the orthographic projection of the first cavity 3 at least partially overlaps with the orthographic projection of the end of the battery cell 4. The battery device of the present application can reduce the stress at the end of the battery cell 4 by at least partially overlapping the orthographic projection of the first cavity 3 with the orthographic projection of the end of the battery cell 4, thereby increasing the service life of the battery device, thereby increasing the service life of the electrical equipment.

[0091] The electrical equipment of the present application may be a vehicle, such as an electric car, an electric motorcycle, etc. Alternatively, it may be other types of electrical equipment, such as an energy storage cabinet, an aircraft, a computer, etc. Those skilled in the art may determine the method according to the actual situation, and no specific limitation is made here.

[0092] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0093] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A battery device, characterized in that: include: A first plate body; A battery cell, the battery cell is arranged on one side of the first plate in a thickness direction and extends along a first direction, the first direction being perpendicular to the thickness direction; A second plate body connected to one side of the first plate body in the thickness direction, and having a first cavity between the second plate body and the first plate body along at least one end of the first direction; On a plane perpendicular to the thickness direction, an orthographic projection of the first cavity at least partially overlaps with an orthographic projection of an end of the battery cell.

2. The battery device according to claim 1, characterized in that: Along the first direction, the length of the overlapping portion of the orthographic projection of the first cavity and the orthographic projection of the end of the battery cell is L1, and the length of the battery cell is L2, satisfying: the ratio of L1 to L2 is 0.8% to 8%.

3. The battery device according to claim 1, characterized in that: The length of the battery core covered by the orthographic projection of the first cavity is L1, which satisfies: 8mm≤L1≤50mm.

4. The battery device according to claim 1, characterized in that: A reinforcement member is disposed in the first cavity.

5. The battery device according to claim 4, characterized in that: The reinforcement member includes a corrugated sheet extending along the first direction or along a second direction, wherein the second direction is perpendicular to the first direction and the thickness direction, respectively.

6. The battery device according to claim 4, characterized in that: The reinforcement member is a foam member.

7. The battery device according to claim 1, characterized in that: A recess is formed at at least one end of the second plate body along the first direction, and the recess and the first plate body define the first cavity.

8. The battery device according to claim 1, characterized in that: It also includes a first side plate and a second side plate. Along the first direction, the first side plate is connected to the end of the first plate body, and the second side plate is connected to the end of the second plate body. A second cavity is provided between the first side plate and the second side plate, and the second cavity is connected to the first cavity.

9. The battery device according to claim 8, characterized in that: Along the first direction, one end of the first side plate away from the first plate body is connected to a first side edge; one end of the second side plate away from the second plate body is connected to a second side edge, and the first side edge and the second side edge are fixedly connected.

10. The battery device according to claim 9, characterized in that: The first plate body, the first side plate, and the first side edge are an integrally formed part, and / or the second plate body, the second side plate, and the second side edge are an integrally formed part.

11. The battery device according to claim 8, characterized in that: A reinforcing rib is provided at a connection between the first side plate and the first plate body.

12. The battery device according to claim 1, characterized in that: A flow channel is provided between the first plate body and the second plate body, and the flow channel is located at one side of the first cavity.

13. The battery device according to claim 12, characterized in that: Along the first direction, the second plate body and both ends of the first plate body have the first cavities between them, and the flow channel is located between the first cavities.

14. The battery device according to claim 1, characterized in that: It also includes an insulating member, which is arranged on the first plate body. Along the first direction, the insulating member corresponds to the end of the battery cell.

15. An electrical equipment, characterized in that: Comprising a battery device as claimed in any one of claims 1 to 14.

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