Battery shell, battery, battery pack and electric equipment

Abstract

The embodiment of the utility model discloses a battery shell, a battery, a battery pack and electric equipment. The battery shell comprises a shell body, a flange edge and a terminal assembly, the flange edge is arranged on the circumferential edge of the shell, the terminal assembly is arranged on the shell, at least part of the terminal assembly is located on the outer side of the first surface of the shell, and the projection, facing the first surface, of the terminal assembly is at least partially overlapped with the projection, facing the first surface, of the flange edge. And one side, close to the flange edge of the shell, of the terminal assembly is provided with an avoiding part.

Description

Technical Field

[0001] The present application belongs to the field of battery technology. Specifically, the present application relates to a battery casing, a battery, a battery pack and an electrical device. Background Art

[0002] The battery shell is composed of upper and lower shells welded together. A pole assembly is arranged on the outside of the battery shell for electrically connecting to the internal battery cell so that the current of the battery cell can be output to the outside through the pole assembly. At present, the pole assembly arranged on the outside of the battery shell is designed to protrude from the edge of the battery shell. Under this structure, when the edges of the upper and lower shells are laser welded, the protruding part formed by the pole assembly will block the laser beam, resulting in the inability to achieve a sealed connection in this area of ​​the battery shell. Utility Model Content

[0003] The purpose of the present application is to provide a new technical solution for a battery casing, a battery, a battery pack and an electrical device.

[0004] According to a first aspect of the present application, a battery housing is provided. The battery housing comprises:

[0005] case;

[0006] A flange edge, the flange edge is arranged on a circumferential edge of the shell; and

[0007] A terminal assembly, wherein the terminal assembly is arranged in the shell, at least part of the terminal assembly is located outside the first surface of the shell, the projection of the terminal assembly toward the first surface at least partially overlaps with the projection of the flange edge toward the first surface, and a avoidance portion is provided on the side of the terminal assembly close to the flange edge of the shell.

[0008] Optionally, the shell includes a main body and a cover plate, the main body has an open end, and the cover plate is arranged at the open end of the main body; the flange edge includes a first flange edge and a second flange edge, the first flange edge is arranged at the circumferential edge of the open end of the main body, and the second flange edge is arranged at the circumferential edge of the cover plate, and the first flange edge is sealed and connected to the second flange edge.

[0009] Optionally, the terminal assembly includes a terminal and a pole arranged on the terminal;

[0010] The terminal is arranged on the cover plate, the pole is used to be electrically connected to the battery cell, and the battery cell is sealed in the shell.

[0011] Optionally, the terminal assembly further includes an insulating member, which is wrapped around the outside of the terminal to isolate the terminal from the cover plate.

[0012] Optionally, the avoidance portion is provided on a side wall of the terminal close to the flange edge.

[0013] Optionally, the avoidance portion is a cut-angle structure formed on the side wall and close to the flange edge, and the cut-angle structure is used to allow external laser energy to be emitted from the cut-angle structure to the flange edge.

[0014] Optionally, the cut angle structure is a beveled angle, and a beveled surface of the beveled angle extends obliquely from the side wall toward a connection position between the terminal and the housing.

[0015] Optionally, the chamfered surface of the chamfered angle forms a set angle D1 with the first normal surface, 0<D1<90°.

[0016] Optionally, the set angle D1 is: 30°≤D1≤75°.

[0017] Optionally, on the intersection plane of the height direction and the length direction of the battery shell, the chamfered surface of the chamfer angle is inclined, and the length of the chamfered surface is H, the straight-line distance between the circumferential edge A of the flange edge and the end B of the chamfered surface is L, and the following relationship is satisfied between H, L and D1: L≥H*cosD1; wherein the flange edge is a straight structure extending outward along the circumferential edge of the shell.

[0018] Optionally, a straight-line distance L between a circumferential edge A of the flange and an end B of the chamfered surface is: 0<L<3mm.

[0019] Optionally, the insulating member covers the bevel surface of the bevel angle, and on the intersection plane of the height direction and the length direction of the battery housing, the insulating member is inclined and has a length of H1, and the following relationship is satisfied between H1 and D1: H1*cosD1≥0.5mm.

[0020] Optionally, the flange edge is bent toward a side away from the chamfered angle.

[0021] Optionally, the bent end of the flange edge does not extend beyond the side wall of the terminal.

[0022] Optionally, the distance from the end B of the beveled surface to the starting end C of the flange edge bend is L1, the length of the flange edge is L2, the distance from the circumferential edge A of the flange edge to the end D of the flange edge bend is L3, and the following relationship is satisfied between L1, L2, L3 and D1 and H: L1+L2+L3-H*cosD1≥2.

[0023] Optionally, the bending angle formed by the flange edge bending toward the side away from the bevel angle is D2, and the following relationship is satisfied between D2 and L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0024] According to a second aspect of the present application, a battery is provided, comprising:

[0025] The battery housing as described in the first aspect; and

[0026] The battery cell is arranged inside the battery shell.

[0027] According to a third aspect of the present application, a battery pack is provided, comprising the battery as described in the second aspect.

[0028] Optionally, the battery pack includes at least two of the batteries, and the battery pack further includes a bus bar connecting the at least two batteries.

[0029] According to a fourth aspect of the present application, an electric device is provided, the electric device comprising:

[0030] A battery pack as described in the third aspect.

[0031] One beneficial effect of this application is:

[0032] The battery proposed in the embodiment of the present application has a avoidance portion provided on the welding side of the terminal assembly on the flange edge of the shell. When a laser beam is used to perform sealing welding on the flange edge of the shell, the laser beam can be directly emitted to the welding side of the shell through the avoidance portion provided on the terminal assembly, thereby smoothly realizing the welding of the shell.

[0033] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0035] Figure 1 A schematic structural diagram of a battery housing provided by an embodiment of the present application from a first perspective;

[0036] Figure 2 A schematic structural diagram of a battery housing from a second perspective provided in an embodiment of the present application;

[0037] Figure 3 A schematic structural diagram of a battery housing from a third perspective provided in an embodiment of the present application;

[0038] Figure 4 A schematic structural diagram of a battery housing from a fourth viewing angle provided in an embodiment of the present application;

[0039] Figure 5 One of the structural schematic diagrams of a battery housing provided in another embodiment of the present application;

[0040] Figure 6 A second structural schematic diagram of a battery housing provided in another embodiment of the present application;

[0041] Figure 7 for Figure 6 A schematic diagram from another perspective;

[0042] Figure 8 for Figure 3 Dimensioning diagram of

[0043] Fig. 9 for Figure 4 Dimensioning diagram of

[0044] Fig.10 for Figure 6 Dimensioning diagram.

[0045] Description of reference numerals:

[0046] 10. Shell; 11. Main body; 111. First flange edge; 12. Cover plate; 121. Second flange edge; 13. Flange edge; 20. Terminal assembly; 21. Avoidance portion; 22. Terminal; 221. Side wall; 23. Pole; 24. Insulator. DETAILED DESCRIPTION

[0047] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0048] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0049] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0050] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0051] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] The battery housing, battery, battery pack and electrical equipment provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0053] According to one aspect of the embodiments of the present application, a battery housing is provided. Figures 1 to 4 The battery pack includes a shell 10, a flange 13 and a terminal assembly 20, wherein the flange 13 is arranged on the circumferential edge of the shell 10, the terminal assembly 20 is arranged on the shell 10, at least part of the terminal assembly 20 is located outside the first surface of the shell 10, the projection of the terminal assembly 20 toward the first surface and the projection of the flange 13 toward the first surface at least partially overlap, and a avoidance portion 21 is arranged on the side of the terminal assembly 20 close to the flange 13 of the shell 10.

[0054] According to the battery casing provided in the embodiment of the present application, the laser welding process of the shell 10 can be optimized by redesigning the shell 10, flange edge 13 and terminal assembly 20 included therein.

[0055] See also Figures 1 to 4 The above-mentioned technical solution provided in the embodiment of the present application is to set a special avoidance portion 21 on the welding side of the terminal assembly 20 located on the flange edge 13. When a laser beam is used to perform sealing welding on the shell 10, the laser beam can be directly emitted to the welding side of the shell 10 through the avoidance portion 21 set on the terminal assembly 20, thereby smoothly realizing the welding of the shell 10.

[0056] Based on the design of the avoidance portion 21 on the terminal assembly 20 , even if the terminal assembly 20 exceeds the edge of the housing 10 , the welding connection of the housing 10 will not be affected.

[0057] In the production process of battery casing, laser welding is a commonly used connection method.

[0058] When the laser beam emitted by the laser is used to laser weld the flange 13, the laser can be tilted at a certain angle to emit the laser beam directly from the avoidance portion 21 on the terminal assembly 20 to the welding side of the housing 10, thereby completing the welding of the housing 10. After the welding of the housing 10 is completed, the housing 10 can form a sealed structure.

[0059] In the embodiment of the present application, by rationally arranging the position of the terminal assembly 20 and designing the avoidance portion 21 thereon, it is ensured that during laser welding, the laser beam can reach the part requiring welding without hindrance or obstruction, thereby improving the welding quality and efficiency.

[0060] In the embodiment of the present application, the design of the avoidance portion 21 prevents the occurrence of poor welding or defects such as loose welding and excessive welding due to the terminal assembly 20 shielding the welding part of the housing 10 during laser welding. This can greatly improve the accuracy and reliability of welding, and provide a guarantee for the safety and performance of the battery.

[0061] In the embodiment of the present application, the provision of the avoidance portion 21 avoids the need for additional adjustment steps during the laser welding process, such as adjusting the welding angle / position, etc., thereby simplifying the production process.

[0062] In the embodiment of the present application, the flange edge 13 is arranged on the circumferential edge of the shell 10. The setting of the flange edge 13 not only facilitates the sealing connection of the shell 10, but also enhances the structural stability of the shell 10, so that the battery can have better resistance when subjected to external forces.

[0063] The terminal assembly 20 is a key component of the battery and is used for input or output of electric energy. In the embodiment of the present application, the terminal assembly 20 is arranged on the housing 10, and at least part of the terminal assembly 20 is located outside the first surface of the housing 10. Figure 1 , the first surface of the housing 10 is Figure 1 The upper surface shown in FIG. 1 is an entire large plane, and the terminal assembly 20 is arranged on this plane.

[0064] It should be noted that the battery housing generally has multiple surfaces, such as a top, a bottom, a side, etc. Here, the "first surface" refers to one of the top surface or the bottom surface.

[0065] The projection of the terminal assembly 20 toward the first surface at least partially overlaps with the projection of the flange edge 13 toward the first surface, which means that the terminal assembly 20 intersects with the flange edge 13 at a set angle or line of sight.

[0066] In summary, the technical solution of the battery shell provided in the embodiment of the present application can optimize the laser welding process of the battery shell, improve the welding accuracy and reliability, and simplify the production process.

[0067] In some examples of this application, see Figures 1 to 4The housing 10 includes a main body 11 and a cover plate 12. The main body 11 has an open end, and the cover plate 12 is arranged at the open end of the main body 11. The flange 13 includes a first flange 111 and a second flange 121. The first flange 111 is arranged at the circumferential edge of the open end of the main body 11, and the second flange 121 is arranged at the circumferential edge of the cover plate 12. The first flange 111 and the second flange 121 are sealed and connected.

[0068] According to the battery provided in the embodiment of the present application, the shell 10 is mainly composed of a main body 11 and a cover plate 12 covering the open end of the main body 11, and the cover plate 12 can be used to close the open end of the main body 11, so that the shell 10 forms a closed structure.

[0069] Among them, a circle of first flange edge 111 is provided at the circumferential edge of the open end of the main body 11, and a circle of second flange edge 121 is provided at the circumferential edge of the cover plate 12. In order not to affect the space inside the shell 10, the first flange edge 111 and the second flange edge 121 are designed to be sealed and connected to form the shell 10.

[0070] By establishing a sealed connection between the first flange edge 111 and the second flange edge 121, this design significantly improves the sealing performance of the housing 10. The sealed connection can effectively prevent moisture, dust and other pollutants from entering the interior of the battery housing 10, thereby protecting the electronic components and chemicals inside the battery housing from damage, and ensuring the normal operation and service life of the entire battery.

[0071] According to the example of the present application, the first flange edge 111 and the second flange edge 121 are sealed and connected to form the flange edge 13. The design of the flange edge 13 not only enhances the overall structural strength of the shell, but also enables the shell to better disperse and resist pressure when subjected to external force. This design helps to reduce the risk of deformation or damage of the shell and improves the safety and reliability of the battery.

[0072] The first flange edge 111 and the second flange edge 121 are sealed and connected by welding, for example.

[0073] For example, the first flange edge 111 and the second flange edge 121 are laser welded.

[0074] In addition, the main body 11 and the first flange edge 111 may be integrally formed, and the cover plate 12 and the second flange edge 121 may be integrally formed.

[0075] The main body 11 and the cover plate 12 are made of metal materials.

[0076] The main body 11 and the cover plate 12 may be made of the same material, such as metal materials such as stainless steel or aluminum alloy.

[0077] According to the housing 10 provided in the embodiment of the present application, the main body 11 and the cover plate 12 constituting the housing 10 can be welded to the flange edges of the two, namely the first flange edge 111 and the second flange edge 121, by laser irradiation from the cover plate 12 to the main body 11, so as to seal the battery cell assembly in the housing 10. The sealing of the housing 10 prevents the risks of internal short circuit and electrolyte leakage of the battery, and improves the safety and reliability of the battery.

[0078] In some examples of this application, see Figures 1 to 4 The terminal assembly 20 includes a terminal 22 and a pole 23 arranged on the terminal 22; wherein the terminal 22 is arranged on the cover plate 12, the pole 23 is used to be electrically connected to the battery cell, and the battery cell is sealed in the shell 10.

[0079] See also Figure 1 The terminal assembly 20 is fixed on the cover plate 12. The terminal assembly 20 includes a terminal 22 and a pole 23 riveted on the terminal 22. The pole 23 includes a positive pole and a negative pole. The pole 23 is used to electrically connect with the battery cell encapsulated in the shell 10 so that the current of the battery cell can be output to the outside through the terminal assembly 20.

[0080] Optionally, please continue to see Figure 1 , two poles 23 can be symmetrically arranged on the terminal 22. This design is based on the fact that the terminal 22 itself is relatively wide, and the balance can be ensured by symmetrically arranging two poles 23 thereon.

[0081] The terminal 22 and the pole 23 may be made of materials with high electrical conductivity.

[0082] Specifically, the terminal 22 and the pole 23 may be made of a material with high electrical conductivity, such as nickel, aluminum, and copper.

[0083] According to the above example, the pole 23 in the terminal assembly 20 is used to electrically connect to the battery cell inside the battery. This direct connection ensures that the current can be transmitted stably and efficiently, reducing resistance and energy loss.

[0084] The terminal assembly 20 is arranged on the cover plate 12, so that the maintenance, repair and possible future expansion of the battery become easier. In addition, by integrating the terminal assembly 20 on the cover plate 12, this design realizes the optimal utilization of the internal space of the battery, which helps to improve the energy density of the battery cell.

[0085] See also Figures 1 to 4 The first flange edge 111 and the second flange edge 121 may be in a straight state, and the first flange edge 111 and the second flange edge 121 do not exceed the side of the terminal 22 where the avoidance portion 21 is provided.

[0086] In some examples of this application, see Figures 1 to 4 The terminal assembly 20 further includes an insulating member 24 , which is wrapped around the outside of the terminal 22 to isolate the terminal 22 from the cover plate 12 .

[0087] The insulating member 24 is made of plastic material, for example.

[0088] Specifically, the insulating member 24 is made of materials such as PPS and PP.

[0089] The insulating member 24 is used to insulate the flange edge of the housing 10 (including the first flange edge 111 and the second flange edge 121 ) from the terminal 22 (eg, an aluminum block) to prevent the two from being connected so that the housing 10 is connected to the terminal assembly 20 .

[0090] The main function of the insulating member 24 is to provide electrical isolation to ensure that no electrical short circuit occurs between the terminal 22 and the cover plate 12. This isolation measure is an important part of battery safety, which can prevent current from flowing through unintended paths, thereby avoiding potential fire or explosion risks.

[0091] The insulating member 24 is wrapped around the outside of the terminal 22 to prevent the terminal 22 from accidentally contacting other metal parts or other potential conductive materials on the cover plate 12, thereby avoiding damage to the internal components of the battery.

[0092] The insulating member 24 is generally made of weather-resistant and chemical-resistant materials that can maintain their insulating properties in harsh environments, thereby enhancing the durability and long-term stability of the battery.

[0093] In summary, the design of the insulating member 24 provides important technical guarantee for the performance and safety of the battery by providing electrical isolation.

[0094] In some examples of this application, see Figure 2 and Figure 3 The avoidance portion 21 is partially provided on the side wall 221 of the terminal 22 close to the flange edge 13 .

[0095] Specifically, see Figure 2 and Figure 3The side wall 221 of the terminal 22 close to the second flange 121 of the cover plate 12 is provided with a relief portion 21 at the lower part. The relief portion 21 corresponds to the welding side of the shell. It does not block the welding side, but can form a space for the laser beam to enter. In this way, when welding the first flange 111 and the second flange 121 on this side of the terminal 22, the laser beam can directly pass through the relief portion 21 to the welding position on the two flanges for welding. Under this structural design, even if the terminal 22 exceeds the edge of the shell 10, it will not affect the welding connection of the shell 10.

[0096] In some examples of this application, see Figure 3 The avoidance portion 21 is a cut-angle structure formed on the side wall 221 and close to the flange edge 13 , and the cut-angle structure is used to allow external laser energy to be emitted from the cut-angle structure to the flange edge 13 .

[0097] Since the avoidance portion 21 adopts a cut-angle structure, the external laser beam can be emitted from the cut-angle structure to the flange edge 13 without obstacles, avoiding poor welding or defects caused by the side wall 221 of the terminal 22 blocking the laser beam, thereby improving the quality and efficiency of laser welding.

[0098] It should be noted that in the embodiment of the present application, by reasonably setting the position of the angle cutting structure on the terminal 22, it can be ensured that the laser beam can accurately irradiate the part that needs to be welded, thereby improving the welding accuracy, which helps to reduce errors in the welding process and ensure the welding quality and strength.

[0099] The corner cutting structure may be formed by removing a portion of the corner position of the terminal 22 .

[0100] In some examples of this application, see Figures 3 to 5 The cut angle structure is a beveled angle, and the beveled surface of the beveled angle extends obliquely from the side wall 221 toward the connection position between the terminal 22 and the housing 10.

[0101] The beveled surface of the bevel angle extends obliquely from the side wall 221 of the terminal 22 toward the connection position between the terminal 22 and the housing 10. This design can better guide the laser beam, ensuring that the laser can be more directly and accurately irradiated to the part that needs to be welded, which helps to improve the accuracy and uniformity of welding.

[0102] The bevel angle design also has a certain versatility and can adapt to lasers at different angles. Due to the inclined extension of the bevel surface, it can provide enough space for laser welders at different angles, so that the laser beam can be incident on the welding side at the best angle.

[0103] It should be noted that the avoidance structure is a cutting structure, which includes but is not limited to the above-mentioned bevel angle, and it is also possible to cut more parts on the bevel angle, and this application does not limit this. For example, other structures can be set on the bevel surface to prevent laser beam reflection and splashing.

[0104] In some examples of the present application, the chamfered surface of the chamfered angle forms a set angle D1 with the first surface, 0<D1<90°.

[0105] The first surface is also the plane where the flange edge 13 is located, which can be seen from Figure 1 The cover plate 12 is shown in FIG.

[0106] When the inclination of the oblique cutting angle does not exceed 90°, laser welding spatter can be reduced.

[0107] Furthermore, the chamfered surface of the chamfered angle forms a set angle D1 with the plane where the flange edge 13 is located, and D1 is: 30°≤D1≤75°.

[0108] During the laser welding process, spatter is often generated due to the high energy concentration of the laser beam, which may have an adverse effect on the welding quality. For the design of the angle of the bevel, by controlling the incident angle of the laser beam, the laser energy is more evenly distributed on the welding side, thereby reducing the generation of spatter. The reduction of spatter helps to improve the stability of laser welding, because spatter may cause the scattering or reflection of the laser beam, thereby affecting the stability of the welding process.

[0109] In summary, when the angle of the bevel does not exceed 90°, it can not only guide the laser beam and improve welding accuracy and efficiency, but also effectively reduce the generation of laser welding spatter, protect the welding site, and improve welding stability and equipment life. This is of great significance for improving the overall quality and reliability of the laser welding process of the battery shell.

[0110] In some examples of this application, see Figure 8 , on the intersection plane of the height direction and the length direction of the battery shell, the chamfered surface of the chamfer angle is inclined, and the length of the chamfered surface is H, the straight-line distance between the circumferential edge A of the flange edge 13 and the end B of the chamfered surface is L, and the following relationship is satisfied between H, L and D1: L≥H*cosD1; wherein the flange edge 13 is a straight structure extending outward along the circumferential edge of the shell 10.

[0111] The intersection plane of the height direction and the length direction of the battery shell, which describes a specific virtual plane. The height direction of the battery shell refers to the vertical direction from the bottom to the top of the battery shell. The length direction of the battery shell refers to the long axis direction of the battery shell, usually the longer side of the battery shell. For many battery shells, this direction is horizontal, perpendicular to the height direction.

[0112] In three-dimensional space, the intersection of two non-parallel planes will form an intersection plane. Here, the intersection plane determined by the height direction and the length direction is considered. Such a description helps to define a specific area in three-dimensional space and facilitates the description of the dimensional relationship between the chamfered surface H of the chamfer angle and the battery housing.

[0113] Figure 8 for Figure 3 ; wherein D1 is the angle between the chamfered surface of the chamfered angle and the first surface (or the flange edge 13 is in a straight state), and the range of D1 is, for example, 0<D1<90°, further 30°≤D1≤75°, and preferably D1 is 45°; L is the straight-line distance between the circumferential edge A of the flange edge 13 and the end B of the chamfered surface; H is the length of the chamfered surface of the chamfered angle. In order to facilitate the electrical connection between the busbar and the terminal assembly 20 and reduce the difficulty of connecting the busbar and the terminal assembly 20, the length H of the chamfered surface of the chamfered angle must satisfy the constraint relationship: L≥H*cosD1.

[0114] The first flange edge 111 and the second flange edge 121 have the same length, that is, the circumferential edges of the first flange edge 111 and the second flange edge 121 are flush.

[0115] The shorter the length of the flange 13 is designed to be, the higher the volume utilization rate of the battery cell will be. This is because the length of the flange will directly affect the volume of the battery shell. If the length of the flange is designed to be small, there will be more space inside the shell, so that larger batteries can be accommodated. In addition, after multiple batteries form a battery pack, if the flange length of a single battery is too long, the size of the formed battery pack will be too large. In this way, under the same volume requirement, the volume of the battery cell will be reduced, thereby reducing the energy storage capacity of the battery pack.

[0116] In some examples of this application, see Figure 8 , the straight-line distance L between the circumferential edge A of the flange edge 13 and the end B of the chamfered surface satisfies: 0<L<3mm.

[0117] This design can meet the requirements of sealing welding, will not affect the volume of the battery cell, and is also beneficial to improving the laser welding yield. Preferably, the straight line distance L between the circumferential edge A of the flange edge 13 and the end B of the chamfered surface is 2.5 mm.

[0118] In some examples of this application, see Figure 4 and Fig. 9 The insulating member 24 is covered on the bevel surface of the bevel angle, and on the intersection plane of the height direction and the length direction of the battery housing, the insulating member 24 is inclined and has a length of H1, and the following relationship is satisfied between H1 and D1: H1*cosD1≥0.5mm.

[0119] Since the insulating member 24 covers the chamfered surface of the chamfered angle, its inclination direction is the same as the chamfered angle of the chamfered surface.

[0120] Figure 4 A cross-sectional view from one perspective of the battery provided in an embodiment of the present application is shown, wherein the insulating member 24 is wrapped around the outside of the terminal 22, and the insulating member 24 is, for example, plastic. The insulating member 24 is used to insulate, for example, the second flange edge 121 from the terminal 22 to prevent the two from being connected so that the shell 10 and the terminal assembly 20 are electrically connected.

[0121] Fig. 9 for Figure 4 D1 is the angle formed by the chamfered surface of the chamfered angle and the first surface (or the flange edge 13 is in a straight state), and H1 is the length of the insulating member 24 covering the chamfered surface. In order to prevent the second flange edge 121 of the cover plate 12 and the first flange edge 111 of the main body 11 from generating molten metal to conduct the terminal 22 and the cover plate 12 when welding, H1 needs to satisfy the constraint relationship: H1*cosD1≥0.5mm.

[0122] In some examples of this application, see Figures 5 to 7 , the flange edge 13 is bent toward the side away from the chamfered angle.

[0123] See also Figure 5 , the lengths of the first flange edge 111 and the second flange edge 121 in a straight state exceed the terminal 22. On this basis, based on the chamfer design on the terminal 22, the laser beam can be away from the terminal 22 for laser welding, which reduces the probability of the laser beam being blocked by the terminal 22, thereby improving the welding yield between the main body 11 and the cover plate 12.

[0124] See also Figure 6 and Figure 7In order to facilitate the electrical connection between the busbar and the terminal assembly 20 and reduce the difficulty of connecting the busbar and the terminal assembly 20, the flange edge 13 extending beyond the terminal 22 can be bent.

[0125] In some examples of this application, see Figure 6 and Figure 7 The bent end of the flange edge 13 does not extend beyond the straight wall structure on the side wall 221 of the terminal 22 .

[0126] Such a design does not interfere with the connection between the busbar (not shown) and the terminal assembly 20 .

[0127] In some examples of this application, see Figure 6 and Fig.10 , the distance from the end B of the chamfer to the starting end C of the bending of the flange edge 13 is L1, the length of the flange edge 13 is L2, the distance from the circumferential edge A of the flange edge 13 to the end D of the bending of the flange edge 13 is L3, and the following relationship is satisfied between L1, L2, L3 and D1 and H: L1+L2+L3-H*cosD1≥2.

[0128] Furthermore, the bending angle formed by the flange edge 13 bending toward the side away from the chamfer angle is D2, and the following relationship is satisfied between D2 and L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0129] Fig.10 for Figure 6 The dimension marking is as follows: D1 is the angle formed by the chamfer of the chamfer and the plane where the flange edge 13 is located (or the flange edge 13 is in a straight state), D2 is the bending angle of the flange edge 13, L1 is the distance from the end B of the chamfer of the chamfer to the starting end C of the bending of the flange edge 13, L2 is the length of the flange edge 13, L3 is the distance from the circumferential edge A of the flange edge 13 to the bent end D, and H is the length of the chamfer of the chamfer. In view of this, in order to improve the welding yield, this application proposes that L1, L2, L3, D1 and H satisfy the constraint relationship: L1+L2+L3-H*cosD1≥2. At the same time, in order to reduce the difficulty of connecting the busbar and the terminal assembly 20, it is also proposed that L1, L2, D1, D2 and H should satisfy the constraint relationship: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0130] For the first flange edge 111 of the main body 11 and the second flange edge 121 of the cover plate 12, the first flange edge 111 and the second flange edge 121 can be connected by first welding and then bending, or by first bending and then welding.

[0131] In one example, the first flange edge 111 and the second flange edge 121 can be welded first and then bent. Specifically, the first flange edge 111 of the main body 11 and the second flange edge 121 of the cover plate 12 are both in a straight state. Figure 5 After the two are assembled, the flange edge will exceed the terminal 22 of the terminal assembly 20. After the cover plate 12 and the main body 11 are welded, the flange edge that exceeds the limit is bent using a tooling fixture to satisfy the formula H*cos D1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0132] In one example, the first flange edge 111 and the second flange edge 121 are first bent and then welded: the first flange edge 111 of the main body 11 and the second flange edge 121 of the cover plate 12 are both in a bent state, and the two are directly welded after assembly.

[0133] It should be noted that the first flange edge 111 and the second flange edge 121 have the same length, but due to the different positions, after the two are bent together, the bent end of the first flange edge 111 is offset from the bent end of the second flange edge 121.

[0134] According to another aspect of an embodiment of the present application, a battery is provided, comprising a battery casing and a battery cell as described above, wherein the battery cell is disposed inside the battery casing.

[0135] According to another aspect of an embodiment of the present application, a battery pack is provided, comprising a battery as described in any one of the above items.

[0136] In some examples of the present application, the battery pack includes at least two of the batteries, and the battery pack further includes a bus bar connecting the at least two of the batteries.

[0137] It should be noted that the battery pack is, for example, a battery module or a battery pack.

[0138] According to another aspect of the present application, an electric device is provided, the electric device comprising: the battery pack as described above. The battery pack is used to provide electric energy for the electric device.

[0139] The electrical equipment may be vehicles, various electronic devices, spacecraft, electric toys, electric tools, etc. Electronic devices include mobile phones, tablet computers, laptop computers, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc. Electric toys include fixed or mobile electric toys. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.

[0140] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery casing, characterized in that: include: Housing (10); A flange edge (13), wherein the flange edge (13) is arranged on a circumferential edge of the housing (10); and A terminal assembly (20), wherein the terminal assembly (20) is arranged on the shell (10), at least a portion of the terminal assembly (20) is located outside a first surface of the shell (10), a projection of the terminal assembly (20) toward the first surface at least partially overlaps with a projection of the flange edge (13) toward the first surface, and a relief portion (21) is provided on a side of the terminal assembly (20) close to the flange edge (13) of the shell (10).

2. The battery housing according to claim 1, characterized in that: The housing (10) comprises a main body (11) and a cover plate (12), the main body (11) having an open end, and the cover plate (12) being arranged at the open end of the main body (11); The flange edge (13) comprises a first flange edge (111) and a second flange edge (121); the first flange edge (111) is arranged at the circumferential edge of the opening end of the main body (11); the second flange edge (121) is arranged at the circumferential edge of the cover plate (12); the first flange edge (111) and the second flange edge (121) are sealed and connected.

3. The battery housing according to claim 2, characterized in that: The terminal assembly (20) comprises a terminal (22) and a pole (23) arranged on the terminal (22); The terminal (22) is arranged on the cover plate (12), the pole (23) is used to be electrically connected to the battery cell, and the battery cell is sealed in the shell (10).

4. The battery housing according to claim 3, characterized in that: The terminal assembly (20) further comprises an insulating member (24), wherein the insulating member (24) is wrapped around the outside of the terminal (22) to isolate the terminal (22) from the cover plate (12).

5. The battery housing according to claim 4, characterized in that: The avoidance portion (21) is provided on a side wall (221) of the terminal (22) close to the flange edge (13).

6. The battery housing according to claim 5, characterized in that: The avoidance portion (21) is a cut-angle structure formed on the side wall (221) at a position close to the flange edge (13), and the cut-angle structure is used to allow external laser energy to be emitted from the cut-angle structure toward the flange edge (13).

7. The battery housing according to claim 6, characterized in that: The cut angle structure is a beveled angle, and the beveled surface of the beveled angle extends obliquely from the side wall (221) toward the connection position between the terminal (22) and the housing (10).

8. The battery casing according to claim 7, characterized in that: The chamfered surface of the chamfered angle forms a set angle D1 with the first surface, 0<D1<90°.

9. The battery casing according to claim 8, characterized in that: The set angle D1 is: 30°≤D1≤75°.

10. The battery casing according to claim 8 or 9, characterized in that: On the intersection plane of the height direction and the length direction of the battery housing, the chamfered surface of the chamfered angle is inclined, and the length of the chamfered surface is H; The straight-line distance between the circumferential edge A of the flange edge (13) and the end B of the chamfered surface is L, and the following relationship is satisfied between H, L and D1: L≥H*cosD1; wherein the flange edge (13) is a straight structure extending outward along the circumferential edge of the shell (10).

11. The battery housing according to claim 10, characterized in that: The straight-line distance L between the circumferential edge A of the flange edge (13) and the end B of the chamfered surface is: 0<L<3mm.

12. The battery housing according to claim 10, characterized in that: The insulating member (24) covers the chamfered surface of the chamfered angle. On the intersection plane of the height direction and the length direction of the battery housing, the insulating member (24) is inclined and has a length of H1. The following relationship is satisfied between H1 and D1: H1*cosD1≥0.5mm.

13. The battery housing according to claim 10, characterized in that: The flange edge (13) is bent toward a side away from the chamfered angle.

14. The battery housing according to claim 13, characterized in that: The bent end of the flange edge (13) does not extend beyond the side wall (221) of the terminal (22).

15. The battery housing according to claim 13, characterized in that: The distance from the end B of the chamfered surface to the starting end C of the flange edge (13) is L1, the length of the flange edge (13) is L2, the distance from the circumferential edge A of the flange edge (13) to the end D of the flange edge (13) is L3, and the following relationship is satisfied between L1, L2, L3 and D1 and H: L1+L2+L3-H*cosD1≥2.

16. The battery housing according to claim 15, characterized in that: The flange edge (13) is bent to form a bending angle D2 toward a side away from the chamfered angle, and the following relationship is satisfied between D2 and L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

17. A battery, characterized in that: include: The battery housing according to any one of claims 1 to 16; and The battery cell is arranged inside the battery shell.

18. A battery pack, characterized in that: Comprising the battery of claim 17.

19. The battery pack according to claim 18, characterized in that: The battery pack includes at least two of the batteries, and the battery pack also includes a bus bar connecting the at least two of the batteries.

20. An electrical equipment, characterized in that: include: A battery pack as claimed in claim 18 or claim 19.

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