Battery device and electric equipment

Abstract

The utility model relates to the related technical field of batteries, and discloses a battery device and electric equipment, the battery device comprises a box body and a battery monomer, the box body comprises a top wall, a bottom wall and a circumferential side wall, the circumferential side wall is connected between the top wall and the bottom wall, the circumferential side wall, the top wall and the bottom wall define a containing cavity, and the battery monomer is arranged in the containing cavity; the circumferential side wall comprises a first wall part of an integrally-formed structure, the first wall part comprises at least one first bent part, a first sub-wall part and a second sub-wall part, the first sub-wall part and the second sub-wall part are connected to the two sides of the first bent part respectively, and the first sub-wall part and the second sub-wall part connected with the same first bent part are adjacent in the circumferential direction of the circumferential side wall and are arranged at an angle. And at least part of the first bending part extends in an arc shape in the direction from the first sub-wall part to the second sub-wall part. The assembling convenience, the structural strength and the sealing performance of the box body are improved, and the performance of the battery device is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and in particular to a battery device and an electrical equipment. Background Art

[0002] This section merely provides background information related to the present application and is not necessarily prior art.

[0003] As the demand for clean energy increases, battery devices have been widely developed. Battery devices usually include a box and battery cells arranged in the box. The performance of the box is of great significance to the battery device. How to improve the performance of the box has always been a continuous concern in the research and development of battery devices. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device to at least improve the convenience of box assembly and structural strength of the battery device.

[0005] The first aspect of the present application proposes a battery device, including a box body and a battery cell, the box body including a top wall, a bottom wall and a circumferential side wall, the circumferential side wall is connected between the top wall and the bottom wall, and is surrounded by the top wall and the bottom wall to form a accommodating cavity, and the battery cell is arranged in the accommodating cavity; the circumferential side wall includes a first wall portion of an integrally formed structure, the first wall portion includes at least one first bending portion and a first sub-wall portion and a second sub-wall portion respectively connected to both sides of the first bending portion, the first sub-wall portion and the second sub-wall portion connected to the same first bending portion are adjacent to each other along the circumference of the circumferential side wall and are arranged at an angle, and the first bending portion at least partially extends in an arc shape from the first sub-wall portion to the second sub-wall portion.

[0006] In the technical solution of the embodiment of the present application, the circumferential side wall includes a first wall portion of an integrally formed structure, and the first wall portion includes a first sub-wall portion and a second sub-wall portion that are adjacent and arranged at an angle and connected by a first bending portion. In this way, at least two adjacent and angled wall portions of the circumferential side wall are arranged to be integrally formed, the processing of the circumferential side wall is convenient, and the assembly and splicing positions between the wall portions of the circumferential side wall are reduced, the structural strength and sealing performance of the circumferential side wall are improved, the assembly convenience, structural strength, and sealing performance of the box body are improved, and the performance of the battery device is improved.

[0007] In addition, the battery device according to the present application may also have the following additional technical features:

[0008] In some embodiments of the present application, the first wall portion is an integrally formed structure of a sheet material roll-bent. During the roll-forming process, the first wall portion of the circumferential side wall forms a first bent portion that extends at least partially in an arc shape at the corner. Compared with the angular bending form, the wrinkles at the corners of the first wall portion of this embodiment are dispersed, reducing the possibility of wrinkle concentration at the corners, making the corners smoother, so that two adjacent and angled wall portions can have better structural integrity after roll-bending integrally formed, thereby improving the strength and sealing performance of the circumferential side wall.

[0009] In some embodiments of the present application, the first bending portion at least partially extends in a circular arc or an elliptical arc from the first sub-wall portion to the second sub-wall portion. The first bending portion is partially set to be in a circular arc or an elliptical arc shape, which has a simple structure and is easy to process, and can better disperse structures such as wrinkles at corners and improve structural strength.

[0010] In some embodiments of the present application, in the direction from the first sub-wall portion to the second sub-wall portion, the first bending portion includes a first arc segment, a straight segment, and a second arc segment arranged in sequence, the end of the first arc segment facing away from the straight segment is connected to the first sub-wall portion, and the end of the second arc segment facing away from the straight segment is connected to the second sub-wall portion. Wherein, in the direction from the first sub-wall portion to the second sub-wall portion, the first arc segment and the second arc segment extend in an arc shape respectively, and the straight segment extends in a straight line. The two ends of the first bending segment are set as the first arc segment and the second arc segment, and the first arc segment and the second arc segment are set as a straight segment, which can better disperse the wrinkles at the corners, reduce the possibility of wrinkle concentration at the corners, so that two adjacent and angled wall portions can be formed as one piece, and can have good structural integrity, and improve the strength and sealing performance of the circumferential side wall.

[0011] In some embodiments of the present application, in the direction from the first sub-wall portion to the second sub-wall portion, the first arc segment extends in a circular arc or an elliptical arc and / or the second arc segment extends in a circular arc or an elliptical arc. Setting the first arc segment and the second arc segment in a circular arc or an elliptical arc has a simple structure and is easy to process, and can better disperse wrinkles at corners and improve structural strength.

[0012] In some embodiments of the present application, the diameter of the arc of the first arc segment and / or the second arc segment ranges from 150 mm to 280 mm; and / or, the extension length of the straight segment from the first sub-wall portion to the second sub-wall portion is 20 mm to 40 mm. Limiting the value of the arc diameter of the first arc segment or the second arc segment to 150 mm to 280 mm can take into account both the curvature change and the angle change of the arc segment, wherein the curvature change rate is relatively gentle, which can make the angle change of the arc segment relatively gentle, thereby better dispersing the wrinkles at the corners; at the same time, the arc segment can meet the angle of the corner within a shorter arc length range, reducing the impact on the shape of the circumferential side wall. Limiting the extension length of the straight segment to 20 mm to 40 mm can reduce the length of the first bending segment on the basis of better dispersing the wrinkles at the corners, thereby reducing the impact on the shape of the circumferential side wall.

[0013] In some embodiments of the present application, in the direction from the first sub-wall portion to the second sub-wall portion, the extension length of the first arc segment is set to be the same as the extension length of the second arc segment; and / or, the tangent of the end of the first arc segment connected to the straight segment is the same as the extension direction of the straight segment; and / or, the tangent of the end of the second arc segment connected to the straight segment is the same as the extension direction of the straight segment. By setting the first arc segment and the second arc segment to have the same extension length, the wrinkles at both ends of the first bending portion can be evenly dispersed, reducing the possibility of wrinkles concentrating in a certain place, improving the overall consistency, and improving the structural strength. By making the tangent of the end of the first arc segment or the second arc segment connected to the straight segment the same as the extension direction of the straight segment, the first arc segment (or the second arc segment) and the straight segment can be smoothly transitioned, reducing the possibility of unevenness (i.e. wrinkles) at the connection between the first arc segment (or the second arc segment) and the straight segment, improving the overall consistency of the first bending portion, and improving its structural strength.

[0014] In some embodiments of the present application, the angle between the extension direction of the straight segment and the extension direction of the first sub-wall portion is 120 to 150 degrees; and / or, the angle between the straight segment and the second sub-wall portion is 120 to 150 degrees. This can make a smoother transition between the straight segment and the first arc segment between the first sub-wall portion. Similarly, for the angle limit between the straight segment and the second sub-wall portion, a smoother transition between the straight segment and the second arc segment between the first sub-wall portion can be made. The possibility of wrinkle concentration at the corner is reduced, making the corner smoother, so that two adjacent and angled wall portions can be integrally formed and have better structural integrity, thereby improving the strength and sealing performance of the circumferential side wall.

[0015] In some embodiments of the present application, the angle between the extension direction of the straight line segment and the extension direction of the first sub-wall portion is 135 degrees; and / or the angle between the extension direction of the straight line segment and the extension direction of the second sub-wall portion is 135 degrees.

[0016] In some embodiments of the present application, the first wall portion includes two first bending portions arranged at intervals, wherein the first sub-wall portion connected to one of the first bending portions and the first sub-wall portion connected to another of the first bending portions have the same extension direction and are arranged opposite to each other, and the second sub-wall portion connected to one of the first bending portions and the second sub-wall portion connected to another of the first bending portions are connected to each other. The two corners of the circumferential side wall are arranged as an integral part through the first bending portions, which facilitates the processing of the circumferential side wall, reduces the assembly and splicing positions between the wall portions of the circumferential side wall, improves the structural strength and sealing performance of the circumferential side wall, improves the assembly convenience, structural strength, and sealing performance of the box, and improves the performance of the battery device.

[0017] In some embodiments of the present application, the circumferential side wall further includes a second wall portion of an integrally formed structure, and along the circumference of the circumferential side wall, the two ends of the second wall portion are respectively a first end and a second end, and the first end and the second end are respectively connected to the two ends of the first wall portion. The circumferential side wall is formed by splicing the first wall portion and the second wall portion which are integrally formed. The circumferential side wall has fewer assembly parts, reduces the splicing positions of the circumferential side wall, improves the integrity of the circumferential side wall, thereby improving the sealing and structural strength of the circumferential side wall and the overall box body, and reduces the welding process, improves production efficiency, and reduces production costs.

[0018] In some embodiments of the present application, the connection between the first end and the first wall portion is at a right angle or in a straight line to improve the convenience of connecting the first wall portion and the second wall portion.

[0019] In some embodiments of the present application, from the first end to the second end, the second wall portion is arranged in a straight line; or, the second wall portion includes at least one second bending portion and a third sub-wall portion and a fourth sub-wall portion respectively connected to both sides of the second bending portion, the third sub-wall portion and the fourth sub-wall portion connected to the same second bending portion are adjacent to each other along the circumference of the circumferential side wall and arranged at an angle, and the second bending portion at least partially extends in an arc shape from the third sub-wall portion to the fourth sub-wall portion. The second wall portion is arranged in a straight line structure or an integral structure with a second bending portion, so that the second wall portion can be integrally formed, and the second wall portion has good structural strength. Wherein, in the case where the second wall portion has corners, the corners can be arranged as the second bending portion, and the arc portion of the second bending portion is conducive to the structural dispersion at the corners (corners), reducing the possibility of wrinkle concentration at the corners, making the corners smoother, so that two adjacent and angled wall portions can be integrally formed, and can have good structural integrity, and improve the strength and sealing performance of the circumferential side wall.

[0020] In some embodiments of the present application, the first wall portion includes a first bent portion, the second wall portion includes a second bent portion, the first sub-wall portion is opposite to and spaced from the third sub-wall portion, the second sub-wall portion is opposite to and spaced from the fourth sub-wall portion, an end of the first sub-wall portion away from the first bent portion is connected to an end of the fourth sub-wall portion away from the second bent portion, and an end of the second sub-wall portion away from the first bent portion is connected to an end of the third sub-wall portion away from the second bent portion;

[0021] Alternatively, the first wall portion includes two first bent portions arranged at intervals, wherein the first sub-wall portion connected to one of the first bent portions and the first sub-wall portion connected to another of the first bent portions have the same extension direction and are arranged opposite to each other, the second sub-wall portion connected to one of the first bent portions and the second sub-wall portion connected to another of the first bent portions are connected to each other, and the second wall portion is arranged in a straight line from the first end to the second end, the second wall portion is arranged opposite to the second sub-wall portion, and the first end and the second end are respectively connected to one end of the two first sub-wall portions away from the first bent portion;

[0022] Alternatively, the first wall portion includes two spaced-apart first bending portions, wherein the first sub-wall portion connected to one of the first bending portions and the first sub-wall portion connected to the other first bending portion have the same extension direction and are arranged opposite to each other, the second sub-wall portion connected to one of the first bending portions and the second sub-wall portion connected to the other first bending portion are connected to each other, and the second wall portion includes two spaced-apart second bending portions, wherein the third sub-wall portion connected to one of the second bending portions and the third sub-wall portion connected to the other second bending portion have the same extension direction and are arranged opposite to each other, the fourth sub-wall portion connected to one of the second bending portions and the fourth sub-wall portion connected to the other second bending portion are connected to each other, the second sub-wall portion and the fourth sub-wall portion are arranged opposite to each other, and the ends of the two first sub-wall portions facing away from the first bending portion are respectively connected one-to-one with the ends of the two third sub-wall portions facing away from the second bending portion.

[0023] A second aspect of the present application provides an electrical device, comprising a battery device provided in the present application or any embodiment of the present application.

[0024] The electrical equipment of this embodiment has the same beneficial effects as the battery device proposed in this application or any embodiment of this application.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0028] Figure 2 A schematic diagram of the structure of a battery device proposed in some embodiments of the present application;

[0029] Figure 3 A schematic diagram of a battery cell according to some embodiments of the present application;

[0030] Figure 4 A schematic diagram of a circumferential side wall from one perspective provided in some embodiments of the present application;

[0031] Figure 5 for Figure 4 A1 enlarged view of the

[0032] Figure 6 A schematic diagram of the structure of the circumferential side wall proposed in some embodiments of the present application;

[0033] Figure 7 for Figure 6 A2 enlarged view of the

[0034] Figure 8 Schematic diagram of circumferential side walls proposed in some other embodiments of the present application;

[0035] Fig. 9 Schematic diagram of the circumferential side wall proposed in some further embodiments of the present application.

[0036] The reference numerals in the specific implementation manner are as follows:

[0037] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0038] 10. Box body; 101. First side wall; 102. Second side wall; 103. Third side wall; 104. Fourth side wall; 105. Accommodating chamber; 110. Top wall; 120. Bottom wall; 130. Circumferential side wall; 131. First wall portion; 1311. First bending portion; 1312. First sub-wall portion; 1313. Second sub-wall portion; 1314. First arc segment; 1315. Straight segment; 1316. Second arc segment; 132. Second wall portion; 1321. Second bending portion; 1322. Third sub-wall portion; 1323. Fourth sub-wall portion;

[0039] 20. Battery cell; 21. Shell; 211. Shell; 212. End cover; 213. Electrode terminal; 22. Electrode assembly; 221. Tab. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0042] 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 clearly and specifically defined.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] Battery devices can store electrical energy and supply power to electrical equipment. With the development of new energy, the use of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields.

[0049] The battery device may include a housing and battery cells, and the housing is used to accommodate the battery cells. The structural strength of the housing is not only important for the battery device to resist external destructive forces, but also has a great impact on the performance of the battery device. For example, during the use of the battery device, the battery cells may expand due to charging and discharging or other factors. If the structural strength of the housing is insufficient, the housing is prone to deformation or cracking due to the expansion of the internal battery cells, affecting the reliability of the battery device, and may even affect the normal use of the battery device due to damage to the housing.

[0050] In some technologies, the box of the battery device can be set to be square, and the frame (circumferential side wall) of the box is set to be welded by multiple extruded parts of different lengths. Usually, the corners of the frame are welded at an angle by two parts. For example, the frame is formed by welding four extruded plates end to end. Studies have found that this kind of frame with multiple parts welded together not only has a complicated welding process, but also the strength of the welding at the joint is lower than the strength of the parts themselves. Usually, the strength of the welded joint can only reach about 60% of the strength of the parts themselves. The multiple splicing positions of the box form weak positions respectively, which makes the overall structural strength of the box low. At the same time, due to the large number of splicing positions, welding sealing problems are prone to occur at the splicing positions, resulting in a decrease in the overall airtightness of the box.

[0051] Based on the above problems, during the research process, we considered further improving the integral molding rate of the frame to reduce the splicing positions of the frame and improve the overall strength and airtightness of the frame. However, further research found that directly extruding the corners of the frame can easily lead to wrinkles on the inside of the corners. In this way, at the corners, the wrinkles destroy the integrity of the parts, causing the parts to yield at that location, and the strength of the frame at these locations will still be low.

[0052] Based on the above research, the present application proposes a battery device, wherein the circumferential side wall (i.e., frame) of the box includes a first wall portion, the first wall portion includes a first sub-wall portion and a second sub-wall portion that are adjacent and arranged at an angle along the circumference of the circumferential side wall, the first sub-wall portion and the second sub-wall portion are connected by a first bending portion, the first wall portion is arranged as an integrally formed structure, and the first bending portion at least partially extends in an arc shape. In other words, the circumferential side wall has at least two adjacent and angled wall portions that are arranged as an integrally formed structure, and the two adjacent and angled wall portions are transitionally connected by a first bending portion that at least partially extends in an arc shape.

[0053] Two adjacent angularly arranged wall portions are transitionally connected by a first bent portion that extends at least partially in an arc shape. The arc portion of the first bent portion can disperse the wrinkles at the corners, reducing the possibility of wrinkle concentration at the corners, so that the two adjacent angularly arranged wall portions can be integrally formed and have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall. Since the circumferential side wall has at least two adjacent angularly arranged wall portions that are integrally formed, the circumferential side wall is easy to process, and the assembly and splicing positions between the wall portions of the circumferential side wall are reduced, thereby improving the structural strength of the circumferential side wall, thereby improving the assembly convenience, structural strength, and airtightness of the box body, and improving the performance of the battery device.

[0054] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system for electrical equipment.

[0055] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0057] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the working power demand of the vehicle 1000 during startup, navigation and driving.

[0058] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000 , but also serve as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0059] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of a battery device proposed in some embodiments of the present application. The battery device 100 mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells 20, and the multiple battery cells 20 are connected in series, in parallel, or in mixed connection through a busbar component.

[0060] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 20 .

[0061] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells 20 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 20 by a cable tie.

[0062] In some embodiments, the battery device 100 may be a battery pack. The battery device 100 includes a case 10 and one or more battery cell assemblies. The battery cell assemblies are accommodated in the case 10 .

[0063] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box body 10 by fixing the battery module in the box body 10 .

[0064] As an example, the battery cell assembly may also be accommodated in the case 10 by directly fixing the plurality of battery cells 20 to the case 10 .

[0065] As an example, the box body 10 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space (ie, the accommodating chamber 105) is formed inside the box body 10 to accommodate the battery monomer assembly.

[0066] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0067] In the embodiment of the present application, the battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell 20 that can be continuously used by activating active materials by charging after the battery cell 20 is discharged.

[0068] The battery cell 20 may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, or the like.

[0069] like Figure 3 As shown, Figure 3 This is a schematic diagram of a battery cell proposed in some embodiments of the present application. The battery cell 20 may include an electrode assembly 22 and a shell 21. The electrode assembly 22 is arranged in the shell 21, including a positive electrode, a negative electrode and a separator, and the separator is arranged between the negative electrode and the positive electrode; the electrode assembly 22 is provided with a pole ear 221, and the pole ear 221 can lead the current from the electrode assembly 22. The pole ear 221 includes a positive pole ear and a negative pole ear. At least one electrode terminal 213 is arranged on the shell 21, and the electrode terminal 213 is electrically connected to the pole ear 221. The electrode terminal 213 can be directly connected to the pole ear 221, and can also be indirectly connected to the pole ear 221 through a current collecting member. The shell 21 includes a shell 211 with an opening and an end cover 212 covering the opening. The electrode terminal 213 can be arranged on the end cover 212 or on the shell 211.

[0070] refer to Figure 2 , and combined with Figures 4 to 9 As shown, Figure 4 A schematic diagram of a circumferential side wall from one perspective proposed in some embodiments of the present application, Figure 5 for Figure 4 A1 enlarged view of Figure 6 This is a schematic diagram of the structure of the circumferential side wall proposed in some embodiments of the present application. Figure 7 for Figure 6 A2 enlarged view of Figure 8 Schematic diagram of the circumferential side wall proposed in some other embodiments of the present application, Fig. 9 Schematic diagram of the circumferential side wall proposed in some embodiments of the present application. The present embodiment provides a battery device 100, including a battery cell 20 and a box body 10. The box body 10 includes a top wall 110, a bottom wall 120 and a circumferential side wall 130. The circumferential side wall 130 is connected between the top wall 110 and the bottom wall 120, and is surrounded by the top wall 110 and the bottom wall 120 to form a receiving cavity 105. The battery cell 20 is arranged in the receiving cavity 105. The circumferential side wall 130 includes a first wall portion 130 of an integrally formed structure. 31. The first wall portion 131 includes at least one first bending portion 1311 and a first sub-wall portion 1312 and a second sub-wall portion 1313 respectively connected to both sides of the first bending portion 1311. The first sub-wall portion 1312 and the second sub-wall portion 1313 connected to the same first bending portion 1311 are adjacent to each other along the circumference of the circumferential side wall 130 and are arranged at an angle. In the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the first bending portion 1311 at least partially extends in an arc shape.

[0071] The battery cell 20 may be provided in one or more.

[0072] The top cover of the box body 10 can be used as the top wall 110, the bottom plate of the box body 10 can be used as the bottom wall 120, and the frame of the box body 10 can be arranged in an annular shape and serve as the circumferential side wall 130. The top wall 110, the bottom wall 120 and the circumferential side wall 130 can be made of the same material or different materials. For example, the top wall 110, the bottom wall 120 and the circumferential side wall 130 can be made of metal materials that are ductile and can be roll-formed, for example, any one of aluminum, aluminum alloy, steel and steel alloy.

[0073] The box 10 is a structure with at least one corner, and specifically, may be a polygonal structure. Figure 2 as well as Figures 4 to 9 As shown, the box body 10 can be roughly a square structure, and the circumferential side wall 130 includes four side walls connected end to end in sequence, and the four side walls are respectively a first side wall 101, a second side wall 102, a third side wall 103 and a fourth side wall 104, wherein the first side wall 101 and the third side wall 103 are arranged opposite to each other, and the second side wall 102 and the fourth side wall 104 are arranged opposite to each other.

[0074] The first wall portion 131 of the integrally molded structure can be understood as the main part of the first wall portion 131 is an integrally molded structure, including each first bending portion 1311 and the first sub-wall portion 1312 and the second sub-wall portion 1313 corresponding to each bending portion are all integrally molded structures, that is, the first wall portion 131 is an integrally molded component.

[0075] Exemplarily, the first wall portion 131 may be an integral injection-molded structure, or the first wall portion 131 may be a structure formed by integrally rolling and bending a plate.

[0076] The circumferential side wall 130 and the top wall 110 may be connected and fixed by at least one of welding, gluing, screws, riveting, etc. The circumferential side wall 130 and the bottom wall 120 may be connected and fixed by at least one of welding, gluing, screws, riveting, etc. The circumferential side wall 130 may also include other wall portions connected to the first wall portion 131, and the other wall portions and the first wall portion 131 may be fixedly connected by welding, gluing, etc.

[0077] The direction from the first sub-wall portion 1312 to the second sub-wall portion 1313 can be roughly understood as the circumferential extension direction of the circumferential side wall 130 corresponding to the first bending portion 1311 area, that is, the circumferential extension direction of the first bending portion 1311 along the circumferential side wall 130 .

[0078] The first bending portion 1311 can be understood as the area corresponding to the corner of the box body 10. The first bending portion 1311 can be extended in an arc shape as a whole, or partially in an arc shape. For example, the first bending portion 1311 can be extended in a circular arc shape, an elliptical arc shape, a parabolic arc shape, etc. at least in part. The first wall portion 131 includes at least one first bending portion 1311. It can be understood that the first wall portion 131 includes at least one corner of the box body 10, and the first sub-wall portion 1312 and the second sub-wall portion 1313 are wall portions connected to the corresponding corners.

[0079] Along the circumference of the circumferential side wall 130, the first sub-wall portion 1312 is connected to one side of the first bending portion 1311, and the second sub-wall portion 1313 is connected to the other side of the first bending portion 1311. The angle setting between the first sub-wall portion 1312 and the second sub-wall portion 1313 means that the angle between the extension directions of the first sub-wall portion 1312 and the second sub-wall portion 1313 is greater than zero and less than 180 degrees, that is, the first sub-wall portion 1312 and the second sub-wall portion 1313 are not colinear or parallel.

[0080] The first sub-wall portion 1312 may be one of the side walls of the box body 10, or a part of the corresponding side wall. The second sub-wall portion 1313 may be one of the side walls of the box body 10, or a part of the corresponding side wall.

[0081] When the first wall portion 131 includes a plurality of first bent portions 1311, each first bent portion 1311 is arranged at intervals along the circumference of the circumferential side wall 130, and the two sides of any first bent portion 1311 are respectively connected to the first sub-wall portion 1312 and the second sub-wall portion 1313. It should be noted that the side wall between two adjacent first bent portions 1311 can be a common and integrated structure of the two first bent portions 1311.

[0082] For example, Figure 4 and Figure 6 As shown, the first wall portion 131 can be roughly an L-shaped structure, and the first wall portion 131 includes a first bending portion 1311. The main portion of the first side wall 101 can serve as the first sub-wall portion 1312 of the first bending portion 1311, and the main portion of the second side wall 102 can serve as the second sub-wall portion 1313 of the first bending portion 1311.

[0083] It should be noted that the main part of the side wall refers to the part of the side wall that extends roughly in a straight line. Specifically, the main part of the first side wall 101 can be understood as the part of the first side wall 101 that extends roughly in a straight line, the main part of the second side wall 102 can be understood as the part of the second side wall 102 that extends roughly in a straight line, and the main part of the third side wall 103 can be understood as the part of the third side wall 103 that extends roughly in a straight line. The main part of the fourth side wall 104 mentioned later can be understood as the part of the fourth side wall 104 that extends roughly in a straight line.

[0084] In the battery device 100 of this embodiment, two adjacent and angled wall portions are transitionally connected by a first bent portion 1311 that extends at least partially in an arc shape. The arc portion of the first bent portion 1311 is conducive to the structural dispersion at the corner (edge), reducing the possibility of wrinkle concentration at the corner, making the corner smoother, so that the two adjacent and angled wall portions can be integrally formed and have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall 130. Since the circumferential side wall 130 has at least two adjacent and angled wall portions that are integrally formed, the circumferential side wall 130 is easy to process, and the assembly and splicing positions between the wall portions of the circumferential side wall 130 are reduced, thereby improving the structural strength of the circumferential side wall 130, thereby improving the assembly convenience, structural strength, and airtightness of the box 10, and improving the performance of the battery device 100.

[0085] According to some embodiments of the present application, optionally, the first wall portion 131 is an integrally formed structure of a sheet material roll-bent.

[0086] The sheet material rolling bending can be understood as the sheet material being rolled to form the first bending portion 1311 , the first sub-wall portion 1312 and the second sub-wall portion 1313 , that is, to form the first wall portion 131 .

[0087] The sheet material may be a ductile metal sheet material.

[0088] In the battery device 100 of the present embodiment, during the roll-forming process, the first wall portion 131 of the circumferential side wall 130 forms a first bent portion 1311 extending at least partially in an arc shape at the corner. Compared with the angular bending form, the wrinkles at the corners of the first wall portion 131 of the present embodiment are dispersed, which reduces the possibility of wrinkle concentration at the corners, making the corners smoother. In this way, the two adjacent and angled wall portions can have better structural integrity after being roll-bent into one piece, thereby improving the strength and sealing performance of the circumferential side wall 130.

[0089] According to some embodiments of the present application, optionally, reference Figures 4 to 9 As shown, in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313 , the first bending portion 1311 at least partially extends in a circular arc shape or an elliptical arc shape.

[0090] In the direction from the first sub-wall portion 1312 to the second sub-wall, the first bending portion 1311 may be in an arc shape with the middle portion bulging outward (the side away from the accommodating cavity 105 is the outside).

[0091] Exemplarily, in the direction from the first sub-wall portion 1312 to the second sub-wall portion, the first bending portion 1311 extends in a circular arc shape or an elliptical arc shape as a whole.

[0092] Exemplarily, in a direction from the first sub-wall portion 1312 to the second sub-wall portion, the first bending portion 1311 includes two circular arcs or two elliptical arcs that are spaced apart.

[0093] The first bending portion 1311 is partially configured to be an arc shape or an elliptical arc shape, which has a simple structure and is easy to process. It can also better disperse structures such as wrinkles at corners and improve structural strength.

[0094] According to some embodiments of the present application, optionally, Figures 4 to 9 As shown, in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the first bending portion 1311 includes a first arc segment 1314, a straight segment 1315 and a second arc segment 1316 which are arranged in sequence, and the end of the first arc segment 1314 facing away from the straight segment 1315 is connected to the first sub-wall portion 1312, and the end of the second arc segment 1316 facing away from the straight segment 1315 is connected to the second sub-wall portion 1313.

[0095] In the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the first arc segment 1314 and the second arc segment 1316 extend in an arc shape, and the straight segment 1315 extends in a straight line. The extension direction of the straight segment 1315 can be set to be inclined relative to the corresponding first sub-wall portion 1312 and second sub-wall portion 1313.

[0096] The shapes of the first arc segment 1314 and the second arc segment 1316 may be the same or different.

[0097] The two ends of the first bending section are arranged as a first arc segment 1314 and a second arc segment 1316, and a straight segment 1315 is arranged between the first arc segment 1314 and the second arc segment 1316, which can better disperse the wrinkles at the corners and reduce the possibility of wrinkle concentration at the corners, so that two adjacent and angled wall portions can be integrally formed and have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall 130.

[0098] According to some embodiments of the present application, optionally, Figures 4 to 9As shown, in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313 , the first arc segment 1314 extends in a circular arc shape or an elliptical arc shape and / or the second arc segment 1316 extends in a circular arc shape or an elliptical arc shape.

[0099] Exemplarily, the first arc segment 1314 and the second arc segment 1316 both extend in an arc shape. The first arc segment 1314 and the second arc segment 1316 may be configured to have the same arc diameter, arc angle or arc length.

[0100] Exemplarily, the first arc segment 1314 and the second arc segment 1316 both extend in an elliptical arc shape.

[0101] The first arc segment 1314 and the second arc segment 1316 are configured to be circular arcs or elliptical arcs, which has a simple structure and is easy to process. The wrinkles at the corners can be better dispersed to improve the structural strength.

[0102] According to some embodiments of the present application, optionally, the diameter of the arc of the first arc segment 1314 and / or the second arc segment 1316 ranges from 150 mm to 280 mm; and / or, the extension length H of the straight line segment 1315 in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313 is 20 mm to 40 mm.

[0103] When the first arc segment 1314 is set to be an arc shape, the diameter of the arc of the first arc segment 1314 refers to the diameter of the circle where the first arc segment 1314 is located, and the diameter of the first arc segment 1314 ranges from 150 mm to 280 mm. It can be understood that the diameter of the circle where the first arc segment 1314 is located can be any value from 150 mm to 280 mm, for example, it can be 150 mm, 160 mm, 175 mm, 200 mm, 250 mm, 280 mm, etc.

[0104] When the first arc segment 1314 is set to an elliptical arc, the diameter of the arc of the first arc segment 1314 refers to the chord length passing through the center of the ellipse where the first arc segment 1314 is located. The diameter of the first arc segment 1314 ranges from 150 mm to 280 mm. It can be understood that the major axis and the minor axis of the ellipse where the first arc segment 1314 is located range from 150 mm to 280 mm, that is, the major axis of the ellipse where the first arc segment 1314 is located ranges from greater than 150 mm to less than or equal to 280 mm, and the minor axis of the ellipse where the first arc segment 1314 is located ranges from greater than or equal to 150 mm to less than 280 mm. For example, the major axis of the ellipse where the first arc segment 1314 is located can be 160 mm, and the minor axis can be 150 mm; for another example, the major axis of the ellipse where the first arc segment 1314 is located can be 280 mm, and the minor axis can be 160 mm.

[0105] When the second arc segment 1316 is set to be an arc shape, the diameter of the arc of the second arc segment 1316 refers to the diameter of the circle where the second arc segment 1316 is located, and the diameter of the second arc segment 1316 ranges from 150 mm to 280 mm. It can be understood that the diameter of the circle where the second arc segment 1316 is located can be any value from 150 mm to 280 mm, for example, it can be 150 mm, 160 mm, 175 mm, 280 mm, etc. When the second arc segment 1316 is set to an elliptical arc, the diameter of the arc of the second arc segment 1316 refers to the chord length passing through the center of the ellipse where the second arc segment 1316 is located. The diameter of the second arc segment 1316 ranges from 150 mm to 280 mm. It can be understood that the value range of the major axis of the ellipse where the second arc segment 1316 is located is greater than 150 mm and less than or equal to 280 mm, and the value range of the minor axis of the ellipse where the second arc segment 1316 is located is greater than or equal to 150 mm and less than 280 mm. For example, the major axis of the ellipse where the second arc segment 1316 is located can be 160 mm, and the value of the minor axis can be 150 mm; for another example, the major axis of the ellipse where the second arc segment 1316 is located can be 280 mm, and the value of the minor axis can be 160 mm.

[0106] Limiting the arc diameter of the first arc segment 1314 or the second arc segment 1316 to a value of 150 mm to 280 mm can take into account both the curvature change and the angle change of the arc segment. The curvature change rate is relatively gentle, which can make the angle change of the arc segment relatively gentle, thereby better dispersing the wrinkles at the corners; at the same time, the arc segment can meet the angle of the corner within a shorter arc length range, reducing the impact on the shape of the circumferential side wall 130.

[0107] The extension length H of the straight segment 1315 can be 20 mm, 21 mm, 25 mm, 29 mm, 30 mm, 31 mm, 35 mm, 40 mm, etc.

[0108] By limiting the extension length H of the straight segment 1315 to 20 mm to 40 mm, the length of the first bending segment can be reduced on the basis of better dispersing the wrinkles at the corners, thereby reducing the impact on the shape of the circumferential side wall 130 .

[0109] According to some embodiments of the present application, optionally, in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the extension length of the first arc segment 1314 and the extension length of the second arc segment 1316 are set to be the same; and / or, the tangent of the end portion of the first arc segment 1314 connected to the straight line segment 1315 is the same as the extension direction of the straight line segment 1315; and / or, the tangent of the end portion of the second arc segment 1316 connected to the straight line segment 1315 is the same as the extension direction of the straight line segment 1315.

[0110] Exemplarily, in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the extension length of the first arc segment 1314 and the extension length of the second arc segment 1316 are set to be the same. The extension length of the first arc segment 1314 can be understood as the arc length of the first arc segment 1314; the extension length of the second arc segment 1316 can be understood as the arc length of the second arc segment 1316.

[0111] Optionally, the curvature of the first arc segment 1314 and the second arc segment 1316 may also be set to be the same. Figures 4 to 9 As shown, the first arc segment 1314 and the second arc segment 1316 can be arranged in a mirror-symmetrical manner with respect to the center of the straight segment 1315 .

[0112] By setting the first arc segment 1314 and the second arc segment 1316 to have the same extension length, wrinkles can be evenly dispersed at both ends of the first bending portion 1311, reducing the possibility of wrinkles concentrating in a certain place, improving overall consistency, and improving structural strength.

[0113] Exemplarily, the tangent of the end portion where the first arc segment 1314 and the straight segment 1315 are connected is in the same direction as the extension direction of the straight segment 1315. Optionally, the ends of the first arc segment 1314 and the straight segment 1315 that are close to each other can be aligned and connected as a whole. By making the tangent of the end portion where the first arc segment 1314 and the straight segment 1315 are connected in the same direction as the extension direction of the straight segment 1315, a smooth transition can be made between the first arc segment 1314 and the straight segment 1315, reducing the possibility of unevenness (i.e., wrinkles) at the connection between the first arc segment 1314 and the straight segment 1315, improving the overall consistency of the first bent portion 1311, and improving its structural strength.

[0114] Exemplarily, the tangent of the end portion where the second arc segment 1316 is connected to the straight segment 1315 is in the same direction as the extension direction of the straight segment 1315. Optionally, the ends of the second arc segment 1316 and the straight segment 1315 that are close to each other can be aligned and connected as a whole. By making the tangent of the end portion where the second arc segment 1316 is connected to the straight segment 1315 in the same direction as the extension direction of the straight segment 1315, the second arc segment 1316 and the straight segment 1315 can have a smooth transition, reducing the possibility of unevenness (i.e., wrinkles) at the connection between the second arc segment 1316 and the straight segment 1315, improving the overall consistency of the first bent portion 1311, and improving its structural strength.

[0115] According to some embodiments of the present application, optionally, Figures 4 to 9As shown, the angle α between the extension direction of the straight segment 1315 and the extension direction of the first sub-wall portion 1312 is 120 degrees to 150 degrees; and / or, the angle β between the extension direction of the straight segment 1315 and the extension direction of the second sub-wall portion 1313 is 120 degrees to 150 degrees.

[0116] The angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 can be set to be the same or different. The angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 minus 180 degrees is the first angle value, and the first angle value is the same as the angle between the first sub-wall portion 1312 and the second sub-wall portion 1313.

[0117] Exemplarily, the angle between the first sub-wall portion 1312 and the second sub-wall portion 1313 is approximately a right angle, that is, the first sub-wall portion 1312 and the second sub-wall portion 1313 are arranged approximately perpendicularly; the sum of the angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313, minus 180 degrees, is 90 degrees, so as to meet the angle requirement between the first sub-wall portion 1312 and the second sub-wall portion 1313. Exemplarily, the angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 may be 120 degrees, and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 may be 150 degrees; alternatively, the angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 may be 130 degrees, and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 may be 140 degrees; alternatively, the angle α between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 may be 135 degrees, and the angle β between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 may be 135 degrees.

[0118] In this embodiment, the angle between the straight segment 1315 and the first sub-wall portion 1312 can make a relatively gentle transition between the straight segment 1315 and the first arc segment 1314 between the first sub-wall portion 1312. Similarly, the angle between the straight segment 1315 and the second sub-wall portion 1313 can make a relatively gentle transition between the straight segment 1315 and the second arc segment 1316 between the first sub-wall portion 1312. The possibility of wrinkle concentration at the corner is reduced, making the corner smoother, so that two adjacent and angled wall portions can be integrally formed and have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall 130.

[0119] According to some embodiments of the present application, optionally, the angle between the extension direction of the straight line segment 1315 and the extension direction of the first sub-wall portion 1312 is 135 degrees; and / or, the angle between the extension direction of the straight line segment 1315 and the extension direction of the second sub-wall portion 1313 is 135 degrees.

[0120] For example, Figures 4 to 9 As shown, the first arc segment 1314 and the second arc segment 1316 can be arranged in mirror symmetry with respect to the center of the straight segment 1315, the first arc segment 1314 and the second arc segment 1316 are arranged at the same angle, the angle α between the extension direction of the straight segment 1315 and the extension direction of the first sub-wall portion 1312 and the angle β between the extension direction of the straight segment 1315 and the extension direction of the second sub-wall portion 1313 are both set to 135 degrees.

[0121] The first arc segment 1314 and the second arc segment 1316 are set at the same angle, which can better disperse the wrinkles at the corners and reduce the possibility of wrinkle concentration at the corners, so that two adjacent and angled wall portions can be formed as one piece and have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall 130.

[0122] According to some embodiments of the present application, optionally, Figure 8 and Fig. 9 As shown, the first wall portion 131 includes two first bending portions 1311 arranged at intervals, wherein the first sub-wall portion 1312 connected to one first bending portion 1311 and the first sub-wall portion 1312 connected to the other first bending portion 1311 have the same extension direction and are arranged opposite to each other, and the second sub-wall portion 1313 connected to one first bending portion 1311 and the second sub-wall portion 1313 connected to the other first bending portion 1311 are connected to each other.

[0123] For example, in some implementations, such as Figure 8As shown, the first wall portion 131 can be roughly a U-shaped structure, the first wall portion 131 includes two first bending portions 1311, the main portion of the second side wall 102 between the two first bending portions 1311 can serve as the second sub-wall portion 1313 of the two first bending portions 1311, the main portion of the first side wall 101 constitutes the first sub-wall portion 1312 of one of the first bending portions 1311, and the main portion of the third side wall 103 constitutes the first sub-wall portion 1312 of the other first bending portion 1311.

[0124] For example, in some other implementations, Fig. 9 As shown, the first wall portion 131 can be roughly a U-shaped structure, the first wall portion 131 includes two first bending portions 1311, the main portion of the second side wall 102 between the two first bending portions 1311 can serve as the second sub-wall portion 1313 of the two first bending portions 1311, the partial length area of ​​the first side wall 101 extending from one end connected to the corresponding first bending portion 1311 to the other end can serve as the first sub-wall portion 1312 of the first bending portion 1311, and the partial length area of ​​the third side wall 103 extending from one end connected to the corresponding first bending portion 1311 to the other end can serve as the first sub-wall portion 1312 of the first bending portion 1311.

[0125] The two corners of the circumferential side wall 130 are respectively arranged to be integrally formed through the first bending portion 1311, so that the circumferential side wall 130 is easy to process and the assembly and splicing positions between the wall portions of the circumferential side wall 130 are reduced, thereby improving the structural strength and sealing performance of the circumferential side wall 130, thereby improving the assembly convenience, structural strength and sealing performance of the box body 10, and improving the performance of the battery device 100.

[0126] According to some embodiments of the present application, optionally, Figures 4 to 9 As shown, the circumferential side wall 130 also includes a second wall portion 132 of an integrally formed structure. Along the circumference of the circumferential side wall 130 , the two ends of the second wall portion 132 are respectively a first end and a second end, and the first end and the second end are respectively connected to the two ends of the first wall portion 131 .

[0127] The second wall portion 132 may be an integrally formed structure formed by injection molding or rolling.

[0128] The second wall portion 132 and the first wall portion 131 may be connected end to end to form a circumferential side wall 130 , and surround the accommodating cavity 105 in a circumferential direction.

[0129] Exemplarily, the first wall portion 131 and the second wall portion 132 may be connected by welding.

[0130] The circumferential side wall 130 is formed by splicing together two parts of an integrally formed first wall portion 131 and a second wall portion 132. The circumferential side wall 130 has fewer assembly parts, which reduces the splicing positions of the circumferential side wall 130 and improves the integrity of the circumferential side wall 130, thereby improving the sealing and structural strength of the circumferential side wall 130 and the overall box body 10, and reduces the welding process, thereby improving production efficiency and reducing production costs.

[0131] According to some embodiments of the present application, optionally, the connection between the first end (the first end of the second wall portion 132) and the first wall portion 131 is at a right angle or in a straight line, and / or the connection between the second end (the second end of the second wall portion 132) and the first wall portion 131 is at a right angle or in a straight line.

[0132] Among them, the straight-line docking means that the connection and the areas on both sides adjacent to the connection extend roughly in a straight line. The first end (the first end of the second wall portion 132) is in a straight-line docking with the connection of the first wall portion 131, which means that the connection of the first end with the first wall portion 131, the area adjacent to the connection and close to the first end, and the area adjacent to the connection and close to the first wall portion 131 extend roughly in a straight line, and the position of the first wall portion 131 used to connect with the first end can face and splice with the first end. The second end (the second end of the second wall portion 132) is in a straight-line docking with the connection of the first wall portion 131, which means that the connection of the second end with the first wall portion 131, the area adjacent to the connection and close to the second end, and the area adjacent to the connection and close to the first wall portion 131 extend roughly in a straight line, and the position of the first wall portion 131 used to connect with the second end can face and splice with the second end.

[0133] For example, Fig. 9 As shown, one end of one of the first sub-wall portions 1312 away from the first bending portion 1311 is connected to the first end (one end of one of the third sub-wall portions 1322 away from the second bending portion 1321 forms the first end) in a straight line, and another end of the first sub-wall portion 1312 of the first wall portion 131 away from the first bending portion 1311 is connected to the second end (one end of the other third sub-wall portion 1322 away from the second bending portion 1321 forms the second end) in a straight line.

[0134] Among them, right-angle docking means that the two parts forming the connection are roughly perpendicular to each other at the connection. The first end (the first end of the second wall portion 132) is connected to the first wall portion 131 at a right angle, which means that the position where the first wall portion 131 is connected to the first end is roughly set at a right angle to the first end, and the position where the first wall portion 131 is used to connect to the first end is perpendicular to the first end and spliced. The second end (the second end of the second wall portion 132) is connected to the first wall portion 131 at a right angle, which means that the position where the first wall portion 131 is connected to the second end is roughly set at a right angle to the second end, and the position where the first wall portion 131 is used to connect to the first end is perpendicular to the second end and spliced.

[0135] For example, Figure 4 and Figure 6 As shown, the first sub-wall portion 1312 and the fourth sub-wall portion 1323 (the end of the fourth sub-wall portion 1323 away from the second bending portion 1321 forms the first end) are approximately perpendicular and butted at a right angle, and the second sub-wall portion 1313 and the third sub-wall portion 1322 (the end of the third sub-wall portion 1322 away from the second bending portion 1321 forms the second end) are approximately perpendicular and butted at a right angle.

[0136] For example, Figure 8 As shown, the two first sub-wall portions 1312 are both arranged perpendicular to the second wall portion 132, wherein one end of the first sub-wall portion 1312 facing away from the first bending portion 1311 is connected to the first end of the second wall portion 132 at a right angle, and the other end of the first sub-wall portion 1312 facing away from the first bending portion 1311 is connected to the second end of the second wall portion 132 at a right angle.

[0137] The connection between the first wall portion 131 and the second wall portion 132 is set to be a right-angle connection or a straight-line connection, which facilitates the alignment and assembly of the first wall portion 131 and the second wall portion 132, improves assembly convenience, and can improve connection stability.

[0138] According to some embodiments of the present application, optionally, the second wall portion 132 is arranged in a straight line from the first end to the second end; or, the second wall portion 132 includes at least one second bending portion 1321 and a third sub-wall portion 1322 and a fourth sub-wall portion 1323 respectively connected to both sides of the second bending portion 1321, and the third sub-wall portion 1322 and the fourth sub-wall portion 1323 connected to the same second bending portion 1321 are adjacent to each other along the circumference of the circumferential side wall 130 and are arranged at an angle, and the second bending portion 1321 at least partially extends in an arc shape from the third sub-wall portion 1322 to the fourth sub-wall portion 1323.

[0139] like Figure 8 As shown, the second wall portion 132 may be arranged in a straight line. The second wall portion 132 may be arranged in a straight line, which may be understood as the second wall portion 132 being substantially an I-shaped structure and having no corners.

[0140] When the second wall portion 132 includes the second bending portion 1321 , its structure may refer to the description of the first wall portion 131 . It is particularly noted that the structure of the second bending portion 1321 may refer to the first bending portion 1311 .

[0141] The second wall portion 132 is set to a linear structure or an integral structure with a second bending portion 1321, so that the second wall portion 132 can be integrally formed, and the second wall portion 132 has good structural strength. Wherein, in the case where the second wall portion 132 has corners, the corners can be set to the second bending portion 1321, and the arc portion of the second bending portion 1321 is conducive to the structural dispersion at the corners (corners), reducing the possibility of wrinkle concentration at the corners, making the corners smoother, so that two adjacent and angled wall portions can be integrally formed, and can have good structural integrity, thereby improving the strength and sealing performance of the circumferential side wall 130.

[0142] According to some embodiments of the present application, optionally, Figure 4 and Figure 6 As shown, the first wall portion 131 includes a first bending portion 1311, the second wall portion 132 includes a second bending portion 1321, the first sub-wall portion 1312 and the third sub-wall portion 1322 are opposite and spaced apart, the second sub-wall portion 1313 and the fourth sub-wall portion 1323 are opposite and spaced apart, the end of the first sub-wall portion 1312 away from the first bending portion 1311 is connected to the end of the fourth sub-wall portion 1323 away from the second bending portion 1321, and the end of the second sub-wall portion 1313 away from the first bending portion 1311 is connected to the end of the third sub-wall portion 1322 away from the second bending portion 1321. Or, as Figure 8 As shown, the first wall portion 131 includes two first bending portions 1311 arranged at intervals, wherein the first sub-wall portion 1312 connected to one of the first bending portions 1311 and the first sub-wall portion 1312 connected to the other first bending portion 1311 have the same extension direction and are arranged opposite to each other, the second sub-wall portion 1313 connected to one of the first bending portions 1311 and the second sub-wall portion 1313 connected to the other first bending portion 1311 are connected to each other, and the second wall portion 132 is arranged in a straight line from the first end to the second end, the second wall portion 132 and the second sub-wall portion 1313 are arranged opposite to each other, and the first end and the second end are respectively connected to one end of the two first sub-wall portions 1312 away from the first bending portion 1311. Or, as Fig. 9As shown, the first wall portion 131 includes two first bending portions 1311 arranged at intervals, wherein a first sub-wall portion 1312 connected to one of the first bending portions 1311 and a first sub-wall portion 1312 connected to another first bending portion 1311 have the same extension direction and are arranged opposite to each other, a second sub-wall portion 1313 connected to one of the first bending portions 1311 and a second sub-wall portion 1313 connected to another first bending portion 1311 are connected to each other, and the second wall portion 132 includes two second bending portions 1321 arranged at intervals, wherein one of the second bending portions 1321 is connected to The third sub-wall portion 1322 connected to the second bending portion 1321 has the same extension direction and is arranged opposite to each other, a fourth sub-wall portion 1323 connected to one second bending portion 1321 and a fourth sub-wall portion 1323 connected to another second bending portion 1321 are connected to each other, the second sub-wall portion 1313 and the fourth sub-wall portion 1323 are arranged opposite to each other, and the ends of the two first sub-wall portions 1312 facing away from the first bending portion 1311 are respectively connected one-to-one with the ends of the two third sub-wall portions 1322 facing away from the second bending portion 1321.

[0143] For example, the first wall portion 131 and the second wall portion 132 may both be substantially L-shaped structures, and the two L-shaped structures are spliced ​​to form the circumferential side wall 130. Figure 4 and Figure 6 As shown, the first wall portion 131 includes a first bending portion 1311, the main portion of the first side wall 101 can be used as the first sub-wall portion 1312 of the first bending portion 1311, and the main portion of the second side wall 102 can be used as the second sub-wall portion 1313 of the first bending portion 1311; the second wall portion 132 includes a second bending portion 1321, the main portion of the third side wall 103 can be used as the third sub-wall portion 1322 of the second bending portion 1321, and the main portion of the fourth side wall 104 can be used as the fourth sub-wall portion 1323 of the second bending portion 1321.

[0144] For example, in some implementations, Figure 8 As shown, the second wall portion 132 is arranged in a straight line, the first wall portion 131 is roughly a U-shaped structure, the first wall portion 131 includes two first bending portions 1311, the main part of the second side wall 102 between the two first bending portions 1311 can be used as the second sub-wall portion 1313 of the two first bending portions 1311, the main part of the first side wall 101 constitutes the first sub-wall portion 1312 of one of the first bending portions 1311, the main part of the third side wall 103 constitutes the first sub-wall portion 1312 of the other first bending portion 1311, the second wall portion 132 serves as the fourth side wall 104, and is connected to the first side wall 101 and the third side wall 103 at one end facing away from the second side wall 102.

[0145] Exemplarily, in some other implementations, the first wall portion 131 and the second wall portion 132 are arranged in mirror symmetry, and both the first wall portion 131 and the second wall portion 132 are approximately U-shaped structures, and the two U-shaped structures are joined and spliced ​​to form the circumferential side wall 130 .

[0146] For example, Fig. 9 As shown, the first wall portion 131 includes two first bending portions 1311, the main body portion of the second side wall 102 between the two first bending portions 1311 can serve as the second sub-wall portion 1313 of the two first bending portions 1311, the half-length area of ​​the first side wall 101 extending from one end connected to the corresponding first bending portion 1311 to the other end can serve as the first sub-wall portion 1312 of the first bending portion 1311, and the partial length area of ​​the third side wall 103 extending from one end connected to the corresponding first bending portion 1311 to the other end can serve as the first sub-wall portion 1312 of the first bending portion 1311. The second wall portion 132 includes two second bending portions 1321, the main part of the fourth side wall 104 between the two second bending portions 1321 can be used as the fourth sub-wall portion 1323 of the two second bending portions 1321, the half-length area of ​​the first side wall 101 extending from one end connected to the corresponding second bending portion 1321 to the other end can be used as the third sub-wall portion 1322 of the second bending portion 1321, and the half-length area of ​​the third side wall 103 extending from one end connected to the corresponding second bending portion 1321 to the other end can be used as the third sub-wall portion 1322 of the second bending portion 1321. In other words, one of the third sub-wall portions 1322 is spliced ​​with the first sub-wall portion 1312 on the corresponding side to form the main part of the first side wall 101; the other third sub-wall portion 1322 is spliced ​​with the first sub-wall portion 1312 on the corresponding side to form the main part of the third side wall 103.

[0147] It should be noted that, when both the first wall portion 131 and the second wall portion 132 are substantially U-shaped structures, the lengths of the first sub-wall portion 1312 and the third sub-wall portion 1322 may be the same or different. The lengths of the two first sub-wall portions 1312 of the first wall portion 131 may be the same or different, and the lengths of the two third sub-wall portions 1322 of the second wall portion 132 may be the same or different.

[0148] In this embodiment, the circumferential side wall 130 is spliced ​​by the first wall portion 131 and the second wall portion 132 , and has a simple structure and is easy to prepare.

[0149] like Figure 2 , Figures 4 to 7As shown, this embodiment provides a battery device 100, including a battery cell 20 and a box body 10, the box body 10 includes a top wall 110, a bottom wall 120 and a circumferential side wall 130, the circumferential side wall 130 is connected between the top wall 110 and the bottom wall 120, and is surrounded by the top wall 110 and the bottom wall 120 to form a accommodating cavity 105, and the battery cell 20 is arranged in the accommodating cavity 105; the circumferential side wall 130 is roughly square in shape, including a first wall portion 131 of an integrally formed structure and a second wall portion 132 of an integrally formed structure. The first wall portion 131 and the second wall portion 132 may both be roughly L-shaped structures, and the two L-shaped structures are spliced ​​to form the circumferential side wall 130, the first wall portion 131 includes a first bending portion 1311, the main portion of the first side wall 101 serves as the first sub-wall portion 1312 of the first bending portion 1311, and the main portion of the second side wall 102 serves as the second sub-wall portion 1313 of the first bending portion 1311; the second wall portion 132 includes a second bending portion 1321, the main portion of the third side wall 103 serves as the third sub-wall portion 1322 of the second bending portion 1321, and the main portion of the fourth side wall 104 serves as the fourth sub-wall portion 1323 of the second bending portion 1321. One end of the first sub-wall portion 1312 away from the first bending portion 1311 is connected to one end of the fourth sub-wall portion 1323 away from the second bending portion 1321 by welding through a weld B1, and one end of the second sub-wall portion 1313 away from the first bending portion 1311 is connected to one end of the third sub-wall portion 1322 away from the second bending portion 1321 by welding through a weld B2 to form the circumferential side wall 130. In the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the first bending portion 1311 includes a first arc segment 1314, a straight segment 1315, and a second arc segment 1316 arranged in sequence, and one end of the first arc segment 1314 away from the straight segment 1315 is connected to the first sub-wall portion 1312, and one end of the second arc segment 1316 away from the straight segment 1315 is connected to the second sub-wall portion 1313, and in the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the first arc segment 1314 is connected to one end of the first sub-wall portion 1314 away from the straight segment 1315, and the second arc segment 1316 is connected to one end of the second sub-wall portion 1313 away from the straight segment 1315. An arc segment 1314 and a second arc segment 1316 extend in an arc shape respectively, and the straight segment 1315 extends in a straight line. From the first sub-wall portion 1312 to the second sub-wall portion 1313, the first arc segment 1314 and the second arc segment 1316 extend in an arc shape. The diameter of the arc of the first arc segment 1314 and the second arc segment 1316 is 230 mm. From the first sub-wall portion 1312 to the second sub-wall portion 1313, the extension length H of the straight segment 1315 is 30 mm. In the direction from the first sub-wall portion 1312 to the second sub-wall portion 1313, the extension length of the first arc segment 1314 and the extension length of the second arc segment 1316 are set to be the same; the tangent of the end portion where the first arc segment 1314 is connected to the straight line segment 1315 is in the same extension direction as the straight line segment 1315; the tangent of the end portion where the second arc segment 1316 is connected to the straight line segment 1315 is in the same extension direction as the straight line segment 1315.The angle between the extension direction of the straight segment 1315 and the extension direction of the first sub-wall portion 1312 is 135 degrees; the angle between the straight segment 1315 and the second sub-wall portion 1313 is 135 degrees. The structure of the second bending portion 1321 is the same as that of the first bending portion 1311, and the first wall portion 131 and the second wall portion 132 can be arranged in mirror symmetry with respect to the diagonal line of the circumferential side wall 130.

[0150] like Figure 8 As shown, this embodiment provides a battery device 100, which differs from the battery device 100 of the previous embodiment in that the first wall portion 131 is roughly U-shaped, the two corners of the first wall portion 131 are respectively arranged as first bending portions 1311, the second wall portion 132 is arranged in a straight line, and the opening end of the U-shaped structure of the first wall portion 131 is welded to the two ends of the second wall portion 132 by a weld B3 to form a circumferential side wall 130.

[0151] like Fig. 9 As shown, this embodiment provides a battery device 100, which differs from the battery device 100 of the previous embodiment in that the first wall portion 131 and the second wall portion 132 are both roughly U-shaped, the two corners of the first wall portion 131 are respectively set as the first bending portion 1311, and the two corners of the second wall portion 132 are respectively set as the second bending portion 1321, and the open ends of the two U-shaped structures are correspondingly welded to form a circumferential side wall 130, and the welding position thereof refers to the weld B4.

[0152] An embodiment of the present application further provides an electrical device, comprising the battery device 100 proposed in the present application or any embodiment of the present application.

[0153] The battery device 100 is used to store or provide electrical energy.

[0154] The power-consuming device may be any of the above-mentioned devices or systems powered by the battery device 100 .

[0155] The electric device of this embodiment has the same beneficial effects as the battery device 100 proposed in this application or any embodiment of this application.

[0156] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0157] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0158] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: Battery cells; A box body, the box body comprising a top wall, a bottom wall and a circumferential side wall, the circumferential side wall is connected between the top wall and the bottom wall, and is surrounded by the top wall and the bottom wall to form a receiving cavity, and the battery cell is arranged in the receiving cavity; The circumferential side wall includes a first wall portion of an integrally formed structure, the first wall portion includes at least one first bending portion and a first sub-wall portion and a second sub-wall portion respectively connected to both sides of the first bending portion, the first sub-wall portion and the second sub-wall portion connected to the same first bending portion are adjacent to each other along the circumference of the circumferential side wall and are arranged at an angle, and the first bending portion at least partially extends in an arc shape from the first sub-wall portion to the second sub-wall portion.

2. The battery device according to claim 1, characterized in that: The first wall portion is an integrally formed structure formed by rolling a plate.

3. The battery device according to claim 1, characterized in that: In a direction from the first sub-wall portion to the second sub-wall portion, the first bending portion at least partially extends in a circular arc shape or an elliptical arc shape.

4. The battery device according to claim 1, characterized in that: In the direction from the first sub-wall portion to the second sub-wall portion, the first bending portion includes a first arc segment, a straight segment and a second arc segment arranged in sequence, the end of the first arc segment facing away from the straight segment is connected to the first sub-wall portion, and the end of the second arc segment facing away from the straight segment is connected to the second sub-wall portion.

5. The battery device according to claim 4, characterized in that: In a direction from the first sub-wall portion to the second sub-wall portion, the first arc segment extends in a circular arc shape or an elliptical arc shape, and / or the second arc segment extends in a circular arc shape or an elliptical arc shape.

6. The battery device according to claim 5, characterized in that: The diameter of the arc of the first arc segment and / or the second arc segment ranges from 150 mm to 280 mm; And / or, in a direction from the first sub-wall portion to the second sub-wall portion, an extension length of the straight line segment is 20 mm to 40 mm.

7. The battery device according to claim 4, characterized in that: In the direction from the first sub-wall portion to the second sub-wall portion, the extension length of the first arc segment and the extension length of the second arc segment are set to be the same; and / or, a tangent line of an end portion where the first arc segment is connected to the straight line segment is in the same extension direction as the straight line segment; And / or, a tangent line of an end portion where the second arc segment is connected to the straight line segment has the same extension direction as the straight line segment.

8. The battery device according to claim 4, characterized in that: The angle between the extension direction of the straight line segment and the extension direction of the first sub-wall portion is 120 degrees to 150 degrees; And / or, the included angle between the straight line segment and the second sub-wall portion is 120 degrees to 150 degrees.

9. The battery device according to claim 8, characterized in that: The angle between the extension direction of the straight line segment and the extension direction of the first sub-wall portion is 135 degrees; And / or, the angle between the extension direction of the straight line segment and the extension direction of the second sub-wall portion is 135 degrees.

10. The battery device according to claim 1, characterized in that: The first wall portion includes two first bending portions arranged at intervals, wherein the first sub-wall portion connected to one of the first bending portions and the first sub-wall portion connected to the other first bending portion have the same extension direction and are arranged opposite to each other, and the second sub-wall portion connected to one of the first bending portions and the second sub-wall portion connected to the other first bending portion are interconnected.

11. The battery device according to any one of claims 1 to 10, characterized in that: The circumferential side wall also includes a second wall portion of an integrally formed structure. Along the circumference of the circumferential side wall, two ends of the second wall portion are respectively a first end and a second end, and the first end and the second end are respectively connected to two ends of the first wall portion.

12. The battery device according to claim 11, characterized in that: The first end is connected to the first wall portion at a right angle or in a straight line, and / or the second end is connected to the first wall portion at a right angle or in a straight line.

13. The battery device according to claim 11, characterized in that: The second wall portion is arranged in a straight line from the first end to the second end; Alternatively, the second wall portion includes at least one second bending portion and a third sub-wall portion and a fourth sub-wall portion respectively connected to both sides of the second bending portion, the third sub-wall portion and the fourth sub-wall portion connected to the same second bending portion are adjacent to each other along the circumference of the circumferential side wall and are arranged at an angle, and the second bending portion at least partially extends in an arc shape in the direction from the third sub-wall portion to the fourth sub-wall portion.

14. The battery device according to claim 13, characterized in that: The first wall portion includes a first bent portion, the second wall portion includes a second bent portion, the first sub-wall portion is opposite to and spaced from the third sub-wall portion, the second sub-wall portion is opposite to and spaced from the fourth sub-wall portion, an end of the first sub-wall portion away from the first bent portion is connected to an end of the fourth sub-wall portion away from the second bent portion, and an end of the second sub-wall portion away from the first bent portion is connected to an end of the third sub-wall portion away from the second bent portion; Alternatively, the first wall portion includes two first bent portions arranged at intervals, wherein the first sub-wall portion connected to one of the first bent portions and the first sub-wall portion connected to another of the first bent portions have the same extension direction and are arranged opposite to each other, the second sub-wall portion connected to one of the first bent portions and the second sub-wall portion connected to another of the first bent portions are connected to each other, and the second wall portion is arranged in a straight line from the first end to the second end, the second wall portion is arranged opposite to the first sub-wall portion, and the first end and the second end are respectively connected to one end of the two first sub-wall portions away from the first bent portion; Alternatively, the first wall portion includes two spaced-apart first bending portions, wherein the first sub-wall portion connected to one of the first bending portions and the first sub-wall portion connected to the other first bending portion have the same extension direction and are arranged opposite to each other, the second sub-wall portion connected to one of the first bending portions and the second sub-wall portion connected to the other first bending portion are connected to each other, and the second wall portion includes two spaced-apart second bending portions, wherein the third sub-wall portion connected to one of the second bending portions and the third sub-wall portion connected to the other second bending portion have the same extension direction and are arranged opposite to each other, the fourth sub-wall portion connected to one of the second bending portions and the fourth sub-wall portion connected to the other second bending portion are connected to each other, the second sub-wall portion and the fourth sub-wall portion are arranged opposite to each other, and the ends of the two first sub-wall portions facing away from the first bending portion are respectively connected one-to-one with the ends of the two third sub-wall portions facing away from the second bending portion.

15. An electrical equipment, characterized in that: A battery device comprising any one of claims 1-14.

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