Battery casing, battery, battery pack, and electrical device

Abstract

A battery casing, a battery, a battery pack, and an electrical device. The battery casing comprises a casing body, a flange edge, and a terminal assembly. The flange edge is arranged on a circumferential edge of the casing body, the terminal assembly is arranged on the casing body, and at least part of the terminal assembly is located on an outer side of a first surface of the casing body. The projection of the terminal assembly towards the first surface at least partially overlaps with the projection of the flange edge towards the first surface, and a clearance portion is arranged on the side of the terminal assembly close to the flange edge of the casing body.

Description

Battery casing, battery, battery pack and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202420862995.1, filed on April 23, 2024, entitled “Battery Casing, Battery, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of battery technology, specifically, it relates to a battery casing, a battery, a battery pack, and an electrical device. Background Technology

[0004] The battery casing is composed of upper and lower shells welded together. A terminal post assembly is located on the outer side of the battery casing for electrical connection with the internal battery cells, allowing current from the cells to be output to the outside through the terminal post assembly. Currently, the terminal post assemblies on the outer side of the battery casing are designed to protrude from the edge of the casing. In this structure, when laser welding is performed on the edges of the upper and lower shells, the protruding part formed by the terminal post assembly blocks the laser beam, preventing a sealed connection in that area of ​​the battery casing. Summary of the Invention

[0005] The purpose of this application is to provide a new technical solution for a battery casing, a battery, a battery pack, and an electrical device.

[0006] According to a first aspect of this application, a battery housing is provided. The battery housing includes:

[0007] case;

[0008] A flange edge, said flange edge being disposed at the circumferential edge of the housing; and

[0009] A terminal assembly is disposed on the housing, at least a portion of the terminal assembly is located outside a first surface of the housing, 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 clearance portion is provided on the side of the terminal assembly near the flange edge of the housing.

[0010] Optionally, the housing includes a main body and a cover plate. The main body has an open end, and the cover plate is disposed 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 disposed at the circumferential edge of the open end of the main body, and the second flange edge is disposed at the circumferential edge of the cover plate. The first flange edge and the second flange edge are sealed together.

[0011] Optionally, the terminal assembly includes a terminal and a pole disposed on the terminal;

[0012] The terminal is disposed on the cover plate, the electrode post is used for electrical connection with the battery cell, and the battery cell is sealed inside the housing.

[0013] Optionally, the terminal assembly further includes an insulating element that wraps around the outside of the terminal to isolate the terminal from the cover plate.

[0014] Optionally, the clearance portion is provided on the side wall of the terminal near the flange edge.

[0015] Optionally, the clearance portion is a chamfered structure formed on the side wall and near the flange edge, the chamfered structure being used to allow external laser light to be directed from the chamfered structure toward the flange edge.

[0016] Optionally, the chamfered structure is an oblique chamfer, and the oblique surface of the oblique chamfer extends obliquely from the side wall toward the connection position between the terminal and the housing.

[0017] Optionally, the oblique surface of the oblique angle forms a set angle D1 with the first surface of the method, where 0 < D1 < 90°.

[0018] Optionally, the set included angle D1 is: 30°≤D1≤75°.

[0019] Optionally, on the plane where the height and length directions of the battery casing intersect, the beveled surface of the beveled angle is inclined, and the length of the beveled surface is H. The straight distance between the circumferential edge A of the flange and the end B of the beveled surface is L. H, L and D1 satisfy the following relationship: L≥H*cosD1; wherein, the flange is a straight structure extending outward along the circumferential edge of the casing.

[0020] Optionally, the straight-line distance L between the circumferential edge A of the flange and the end B of the chamfered surface is: 0 < L < 3 mm.

[0021] Optionally, the insulating element covers the beveled surface of the beveled angle on the plane where the height and length directions of the battery casing intersect. The insulating element is inclined and has a length of H1. The following relationship is satisfied between H1 and D1: H1*cosD1≥0.5mm.

[0022] Optionally, the flange edge is bent toward the side opposite to the chamfer angle.

[0023] Optionally, the bent end of the flange edge does not extend beyond the sidewall of the terminal.

[0024] Optionally, the distance from the end B of the beveled surface to the starting end C of the flange bend is L1, the length of the flange edge is L2, and the distance from the circumferential edge A of the flange edge to the end D of the flange bend is L3. L1, L2, L3 and D1 and H satisfy the following relationship: L1+L2+L3-H*cosD1≥2.

[0025] Optionally, the bending angle formed by the flange edge bending away from the oblique angle is D2, and D2 satisfies the following relationship with L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0026] According to a second aspect of this application, a battery is provided, the battery comprising:

[0027] The battery casing as described in the first aspect; and

[0028] The battery cell is disposed inside the battery casing.

[0029] According to a third aspect of this application, a battery pack is provided, the battery pack comprising the batteries as described in the second aspect.

[0030] Optionally, the battery pack includes at least two of the batteries, and the battery pack further includes a bus that connects to at least two of the batteries.

[0031] According to a fourth aspect of this application, an electrical appliance is provided, the electrical appliance comprising:

[0032] The battery pack as described in the third aspect.

[0033] One beneficial effect of this application is that:

[0034] The battery proposed in this application provides a clearance portion on the welding side of the flange edge of the housing when the flange edge of the housing is sealed and welded by a laser beam. The laser beam can be directly directed to the welding side of the housing through the clearance portion provided on the terminal assembly, thereby successfully achieving the welding of the housing.

[0035] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0036] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0037] Figure 1 is a first-view structural schematic diagram of a battery casing provided in an embodiment of this application;

[0038] Figure 2 is a structural schematic diagram of a battery casing provided in an embodiment of this application from a second perspective.

[0039] Figure 3 is a structural schematic diagram of a battery casing provided in an embodiment of this application from a third perspective;

[0040] Figure 4 is a structural schematic diagram of a battery casing provided in an embodiment of this application from a fourth perspective;

[0041] Figure 5 is a schematic diagram of the structure of a battery casing provided in another embodiment of this application;

[0042] Figure 6 is a second schematic diagram of the structure of a battery casing provided in another embodiment of this application;

[0043] Figure 7 is a schematic diagram from another perspective of Figure 6;

[0044] Figure 8 is a schematic diagram of the dimension annotations in Figure 3;

[0045] Figure 9 is a schematic diagram of the dimensioning in Figure 4;

[0046] Figure 10 is a schematic diagram of the dimensioning in Figure 6.

[0047] Explanation of reference numerals in the attached drawings: 10, housing; 11, main body; 111, first flange edge; 12, cover plate; 121, second flange edge; 13, flange edge; 20, terminal assembly; 21, clearance part; 22, terminal; 221, side wall; 23, pole; 24, insulating component. Detailed Implementation

[0048] 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, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0049] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0050] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0051] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0053] The battery casing, battery, battery pack, and electrical equipment provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0054] According to one aspect of the present application, a battery casing is provided. Referring to Figures 1 to 4, the battery pack includes a housing 10, a flange 13, and a terminal assembly 20. The flange 13 is disposed on the circumferential edge of the housing 10, and the terminal assembly 20 is disposed on the housing 10. At least a portion of the terminal assembly 20 is located outside a first surface of the housing 10. The projection of the terminal assembly 20 toward the first surface at least partially overlaps with the projection of the flange 13 toward the first surface. An avoidance portion 21 is provided on the side of the terminal assembly 20 near the flange 13 of the housing 10.

[0055] According to the battery casing provided in the embodiments of this application, the laser welding process of the casing 10 can be optimized by redesigning its included housing 10, flange edge 13 and terminal assembly 20.

[0056] Referring to Figures 1 to 4, the above-mentioned technical solution provided in the embodiments of this application provides a special avoidance part 21 on the welding side of the terminal assembly 20 located on the flange edge 13. When the housing 10 is sealed and welded with a laser beam, the laser beam can be directly directed to the welding side of the housing 10 through the avoidance part 21 provided on the terminal assembly 20, thereby successfully achieving the welding of the housing 10.

[0057] Based on the design of the clearance portion 21 on the terminal assembly 20, even if the terminal assembly 20 extends beyond the edge of the housing 10, it will not affect the welding connection of the housing 10.

[0058] Laser welding is a commonly used connection method in the production process of battery casings.

[0059] When laser welding is performed on the flange edge 13 using a laser beam emitted by a laser, the laser can be tilted at a certain angle, directing the laser beam directly from the clearance 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.

[0060] In this embodiment of the application, by reasonably arranging the position of the terminal assembly 20 and designing the avoidance part 21 thereon, it is ensured that the laser beam can reach the part to be welded without obstruction or blockage during laser welding, thereby improving the welding quality and efficiency.

[0061] In this embodiment, the design of the avoidance part 21 prevents welding defects such as weak welds or over-welding caused by the terminal assembly 20 obstructing the welding area of ​​the housing 10 during laser welding. This greatly improves the precision and reliability of welding, ensuring the safety and performance of the battery.

[0062] In this embodiment of the application, the avoidance part 21 avoids the need for additional adjustments during the laser welding process, such as adjusting the welding angle / position, thereby simplifying the production process.

[0063] In this embodiment, the flange edge 13 is disposed on the circumferential edge of the housing 10. The flange edge 13 not only facilitates the sealing connection of the housing 10, but also enhances the structural stability of the housing 10, so that the battery can have better resistance when subjected to external forces.

[0064] The terminal assembly 20 is a key component of the battery, used for the input or output of electrical energy. In embodiments of this application, the terminal assembly 20 is disposed on the housing 10, and at least a portion of the terminal assembly 20 is located outside the first surface of the housing 10. Referring to FIG1, the first surface of the housing 10 is the upper surface shown in FIG1, which is a large plane, and the terminal assembly 20 is disposed on this plane.

[0065] It should be noted that battery casings typically have multiple surfaces, such as the top, bottom, and sides. Here, "first surface" refers to either the top or bottom surface.

[0066] 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. This means that the terminal assembly 20 intersects with the flange edge 13 at a set angle or line of sight.

[0067] In summary, the technical solution for the battery casing provided in this application can optimize the laser welding process of the battery casing, improve welding accuracy and reliability, and simplify the production process.

[0068] In some examples of this application, referring to Figures 1 to 4, the housing 10 includes a body 11 and a cover plate 12. The body 11 has an open end, and the cover plate 12 is disposed at the open end of the body 11. The flange edge 13 includes a first flange edge 111 and a second flange edge 121. The first flange edge 111 is disposed at the circumferential edge of the open end of the body 11, and the second flange edge 121 is disposed at the circumferential edge of the cover plate 12. The first flange edge 111 and the second flange edge 121 are sealed together.

[0069] According to the battery provided in the embodiments of this application, the housing 10 is mainly composed of a main body 11 and a cover plate 12 covering the open end of the main body 11. The cover plate 12 can be used to close the open end of the main body 11, so that the housing 10 forms a sealed structure.

[0070] The main body 11 has a first flange edge 111 around its circumferential edge at the opening end, and the cover plate 12 has a second flange edge 121 around its circumferential edge. In order not to affect the internal space of the housing 10, the first flange edge 111 and the second flange edge 121 are designed to be sealed together to form the housing 10.

[0071] 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 effectively prevents moisture, dust, and other contaminants from entering the interior of the battery housing 10, thereby protecting the electronic components and chemicals inside the battery casing from damage and ensuring the normal operation and lifespan of the entire battery.

[0072] According to an example of this application, the first flange edge 111 and the second flange edge 121 are sealed together to form the flange edge 13. The design of the flange edge 13 not only enhances the overall structural strength of the housing, but also allows the housing to better disperse and resist pressure when subjected to external forces. This design helps reduce the risk of housing deformation or damage, improving the safety and reliability of the battery.

[0073] The first flange edge 111 and the second flange edge 121 are sealed together, for example, by welding.

[0074] For example, the first flange edge 111 and the second flange edge 121 are laser welded together.

[0075] Furthermore, the main body 11 and the first flange edge 111 can be integrally formed, and the cover plate 12 and the second flange edge 121 can be integrally formed.

[0076] The main body 11 and the cover plate 12 are made of metal.

[0077] The main body 11 and the cover plate 12 can be made of the same material, such as stainless steel or aluminum alloy.

[0078] According to the housing 10 provided in the embodiments of this application, the main body 11 and the cover plate 12 constituting the housing 10 can be welded together by a laser beam shot from the cover plate 12 toward the main body 11, namely the first flange edge 111 and the second flange edge 121, thereby sealing the battery cell assembly inside the housing 10. The sealing of the housing 10 prevents the risk of internal short circuits and electrolyte leakage of the battery, improving the safety and reliability of the battery.

[0079] In some examples of this application, referring to Figures 1 to 4, the terminal assembly 20 includes a terminal 22 and a pole post 23 disposed on the terminal 22; wherein, the terminal 22 is disposed on the cover plate 12, the pole post 23 is used for electrical connection with the battery cell, and the battery cell is sealed and disposed within the housing 10.

[0080] Referring to Figure 1, the terminal assembly 20 is fixed on the cover plate 12. The terminal assembly 20 includes a terminal 22 and a pole post 23 riveted to the terminal 22. The pole post 23 includes a positive pole and a negative pole. The pole post 23 is used to make an electrical connection with the battery cell encapsulated in the housing 10, so that the current of the battery cell can be output to the outside through the terminal assembly 20.

[0081] Optionally, referring to Figure 1, two pole posts 23 can be symmetrically arranged on the terminal 22. This design takes into account that the terminal 22 itself is relatively wide, and symmetrical arrangement of two pole posts 23 on it can ensure balance.

[0082] The terminal 22 and the pole post 23 can be made of materials with high electrical conductivity.

[0083] Specifically, the terminal 22 and the electrode post 23 can be made of high-conductivity materials such as nickel, aluminum and copper.

[0084] According to the above example, the terminal post 23 in the terminal assembly 20 is used to make an electrical connection with the battery cell inside the battery. This direct connection ensures that the current can be transmitted stably and efficiently, reducing resistance and energy loss.

[0085] The terminal assembly 20 is mounted on the cover plate 12, making battery maintenance, repair, and future expansion easier. Furthermore, by integrating the terminal assembly 20 onto the cover plate 12, this design optimizes the use of internal battery space, which helps improve the cell's energy density.

[0086] Referring to Figures 1 to 4, the first flange edge 111 and the second flange edge 121 can be straight, and neither the first flange edge 111 nor the second flange edge 121 extends beyond the side of the terminal 22 where the clearance portion 21 is provided.

[0087] In some examples of this application, referring to Figures 1 to 4, the terminal assembly 20 further includes an insulating member 24 that wraps around the outside of the terminal 22 to isolate the terminal 22 from the cover plate 12.

[0088] The insulating component 24 is, for example, made of plastic material.

[0089] Specifically, the insulating element 24 is made of materials such as PPS and PP.

[0090] The insulating element 24 is used to insulate the flange edge (including the first flange edge 111 and the second flange edge 121) of the housing 10 from the terminal 22 (e.g., an aluminum block) to prevent the two from communicating with each other so that the housing 10 can be connected to the terminal assembly 20.

[0091] The primary function of the insulating element 24 is to provide electrical isolation, ensuring that no electrical short circuit occurs between the terminal 22 and the cover plate 12. This isolation measure is an important component of battery safety, preventing current from flowing through unintended paths and thus avoiding potential fire or explosion risks.

[0092] The insulating element 24 wraps around the outside of the terminal 22, preventing the terminal 22 from accidentally coming into contact with other metal parts or other potentially conductive materials on the cover plate 12, thereby avoiding damage to the internal components of the battery.

[0093] The insulating component 24 is typically made of weather-resistant and chemically resistant materials that can maintain their insulating properties in harsh environments, thereby enhancing the battery's durability and long-term stability.

[0094] In summary, the design of the insulating component 24 provides important technical protection for the performance and safety of the battery by providing electrical isolation.

[0095] In some examples of this application, referring to Figures 2 and 3, the clearance portion 21 is partially provided on the side wall 221 of the terminal 22 near the flange edge 13.

[0096] Specifically, referring to Figures 2 and 3, a clearance portion 21 is provided on the lower part of the sidewall 221 of the terminal 22 near the second flange edge 121 of the cover plate 12. This clearance portion 21 corresponds to the welding side of the housing and does not obstruct the welding side; instead, it creates space for the laser beam to enter. Thus, when welding the first flange edge 111 and the second flange edge 121 on this side of the terminal 22, the laser beam can directly pass through the clearance portion 21 to the welding position on the two flange edges for welding. With this structural design, even if the terminal 22 extends beyond the edge of the housing 10, it will not affect the welding connection of the housing 10.

[0097] In some examples of this application, referring to FIG3, the clearance portion 21 is a chamfered structure formed on the side wall 221 and near the flange edge 13, the chamfered structure being used to allow external laser light to be directed from the chamfered structure toward the flange edge 13.

[0098] Because the clearance part 21 adopts a chamfered structure, the external laser beam can be directed to the flange edge 13 from the chamfered structure without obstruction, 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.

[0099] It should be noted that, in this embodiment of the application, by reasonably setting the position of the chamfered structure on the terminal 22, it can be ensured that the laser beam can accurately irradiate the part to be welded, thereby improving the welding accuracy. This helps to reduce errors in the welding process and ensure the welding quality and strength.

[0100] The chamfered structure can be formed by removing a portion at the corner of the terminal 22.

[0101] In some examples of this application, referring to Figures 3 to 5, the chamfered structure is a beveled angle, and the beveled surface of the beveled angle extends obliquely from the sidewall 221 toward the connection position between the terminal 22 and the housing 10.

[0102] The beveled surface of the beveled 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 and ensure that the laser can irradiate the part to be welded more directly and accurately, which helps to improve the accuracy and uniformity of welding.

[0103] The beveled angle design also has a certain degree of versatility, adapting to lasers at different angles. Due to the inclined extension of the beveled surface, it provides sufficient space for laser welders at different angles, allowing the laser beam to be incident on the welding side at the optimal angle.

[0104] It should be noted that the avoidance part is a chamfered structure, which includes, but is not limited to, the aforementioned beveled angle. Adding an extra portion to the beveled angle is also possible, and this application does not impose any limitations on this. For example, other structures can be provided on the beveled surface to prevent laser beam reflection and splashing.

[0105] In some examples of this application, the beveled surface of the beveled angle forms a set angle D1 with the first surface, where 0 < D1 < 90°.

[0106] The first surface, which is also the plane where the flange edge 13 is located, can be seen in the cover plate 12 shown in Figure 1.

[0107] Laser welding spatter can be reduced when the inclination of the oblique cut angle does not exceed 90°.

[0108] Furthermore, the beveled surface of the beveled angle forms a set angle D1 with the plane where the flange edge 13 is located, where D1 is: 30°≤D1≤75°.

[0109] During laser welding, the high energy concentration of the laser beam often generates spatter, which can negatively impact weld quality. By designing the angle of the beveled surface and controlling the incident angle of the laser beam, the laser energy is distributed more evenly on the welding side, thus reducing spatter generation. Reduced spatter contributes to improved laser welding stability, as spatter can cause laser beam scattering or reflection, affecting the stability of the welding process.

[0110] In summary, when the angle of the bevel does not exceed 90°, it not only guides the laser beam, improving welding accuracy and efficiency, but also effectively reduces laser welding spatter, protects the welded area, and improves welding stability and equipment lifespan. This is of great significance for improving the overall quality and reliability of laser welding processes for battery casings.

[0111] In some examples of this application, referring to Figure 8, on the intersecting plane of the height and length directions of the battery casing, the beveled surface of the beveled angle is inclined, and the length of the beveled surface is H. The straight-line distance between the circumferential edge A of the flange 13 and the end B of the beveled surface is L. H, L and D1 satisfy the following relationship: L≥H*cosD1; wherein, the flange 13 is a straight structure extending outward along the circumferential edge of the casing 10.

[0112] The intersecting plane of the battery casing's height and length directions describes a specific virtual plane. The height direction of the battery casing refers to the vertical direction from bottom to top. The length direction refers to the direction of the battery casing's major axis, typically the longer side of the casing. For many battery casings, this direction is horizontal and perpendicular to the height direction.

[0113] In three-dimensional space, the intersection of two non-parallel planes forms a cross plane. Here, we consider the cross plane defined by the height and length directions. This description helps define a specific region in three-dimensional space, facilitating the description of the dimensional relationship between the beveled surface H of the chamfered angle and the battery casing.

[0114] Figure 8 is a dimensioned diagram of Figure 3; where D1 is the angle between the beveled surface of the chamfered angle and the first surface (or the flange edge 13 in a straight state), and the range of D1 is, for example, 0 < D1 < 90°, further, 30° ≤ D1 ≤ 75°, and more 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 connection difficulty between 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.

[0115] The first flange edge 111 and the second flange edge 121 are of the same length, that is, the circumferential edges of the first flange edge 111 and the second flange edge 121 are flush.

[0116] The shorter the length of the flange edge 13, the higher the cell volume utilization rate. This is because the length of the flange edge directly affects the battery casing volume. A shorter flange edge allows for more internal space, accommodating larger cells. Furthermore, when multiple cells form a battery pack, an excessively long flange edge for a single cell results in an excessively large battery pack. This reduces the cell volume for the same volume requirements, thus decreasing the energy storage capacity of the battery pack.

[0117] In some examples of this application, referring to Figure 8, the straight-line distance L between the circumferential edge A of the flange 13 and the end B of the chamfered surface satisfies: 0 < L < 3 mm.

[0118] This design meets the requirements for sealed welding without affecting the size of the battery cell, and is also beneficial for improving the yield of laser welding. Preferably, the straight-line distance L between the circumferential edge A of the flange 13 and the end B of the beveled surface is 2.5 mm.

[0119] In some examples of this application, referring to Figures 4 and 9, the insulating member 24 covers the beveled surface of the beveled angle on the plane where the height and length directions of the battery casing intersect. 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.

[0120] Since the insulating element 24 covers the beveled surface of the beveled angle, its tilt direction is the same as the beveled angle of the beveled surface.

[0121] Figure 4 shows a cross-sectional view of a battery provided in an embodiment of this application. The insulating member 24 is wrapped around the outside of the terminal 22. 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, preventing them from communicating so that the housing 10 can be electrically connected to the terminal assembly 20.

[0122] Figure 9 shows the dimensions of Figure 4. D1 is the angle formed by the beveled surface of the beveled angle and the first surface (or when the flange edge 13 is straight). H1 is the length of the insulating component 24 covering the beveled surface. To prevent molten metal from being generated during welding of the second flange edge 121 of the cover plate 12 and the first flange edge 111 of the body 11, which would then connect the terminal 22 to the cover plate 12, H1 must satisfy the constraint: H1*cosD1≥0.5mm.

[0123] In some examples of this application, see Figures 5 to 7, the flange edge 13 is bent toward the side away from the chamfer angle.

[0124] Referring to Figure 5, the lengths of the first flange edge 111 and the second flange edge 121 in their straight state extend beyond the terminal 22. Based on this, and due to the beveled angle design on the terminal 22, the laser beam can be laser-welded away from the terminal 22, reducing the probability of the laser beam being blocked by the terminal 22, thereby improving the welding yield between the body 11 and the cover plate 12.

[0125] Referring to Figures 6 and 7, 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 flange edge 13 extending beyond the terminal 22 can be bent.

[0126] In some examples of this application, referring to Figures 6 and 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.

[0127] This design allows for connection between the bus (not shown) and the terminal assembly 20 without interfering with the connection.

[0128] In some examples of this application, referring to Figures 6 and 10, the distance from the end B of the beveled surface to the starting end C of the bend of the flange edge 13 is L1, the length of the flange edge 13 is L2, and the distance from the circumferential edge A of the flange edge 13 to the end D of the bend of the flange edge 13 is L3. L1, L2, L3 and D1 and H satisfy the following relationship: L1+L2+L3-H*cosD1≥2.

[0129] Furthermore, the bending angle formed by the flange edge 13 bending away from the oblique angle is D2, and D2 satisfies the following relationship with L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0130] Figure 10 shows the dimensioning of Figure 6. D1 is the angle formed by the beveled surface of the beveled angle and the plane where the flange edge 13 is located (or the flange edge 13 in a straight state). D2 is the bending angle of the flange edge 13. L1 is the distance from the end B of the beveled surface of the beveled angle 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 bending end D. H is the length of the beveled surface of the beveled angle. In view of this, in order to improve the welding yield, this application proposes that L1, L2, L3, D1 and H satisfy the following constraint relationship: L1+L2+L3-H*cos D1≥2. Meanwhile, in order to reduce the difficulty of connecting the busbar to the terminal assembly 20, it is proposed that L1, L2, D1, D2 and H should satisfy the following constraint relationship: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0131] 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 welding first and then bending, or by bending first and then welding.

[0132] In one example, the first flange edge 111 and the second flange edge 121 can be implemented by welding first and then bending. 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, as shown in Figure 5. After the two are assembled, the flange edge will extend beyond the terminal 22 of the terminal assembly 20. After the cover plate 12 and the main body 11 are welded, the extended flange edge is bent using a tooling fixture to satisfy the formula H*cos D1≥sinD2*L2*180 / D2+L2*cosD2+L1.

[0133] In one example, the first flange edge 111 and the second flange edge 121 are implemented by bending them first and then welding them: the first flange edge 111 of the main body 11 and the second flange edge 121 of the cover plate 12 are both bent, and they are directly welded after assembly.

[0134] It should be noted that the first flange edge 111 and the second flange edge 121 are of the same length, but due to their different positions, after they are bent together, the bent ends of the first flange edge 111 and the bent ends of the second flange edge 121 are offset by a certain distance.

[0135] According to another aspect of the embodiments of this application, a battery is provided, the battery including a battery casing and a battery cell as described above, the battery cell being disposed inside the battery casing.

[0136] According to another aspect of the embodiments of this application, a battery pack is provided, the battery pack comprising the batteries as described in any of the preceding claims.

[0137] In some examples of this application, the battery pack includes at least two of the batteries, and the battery pack also includes a bus that connects the at least two of the batteries.

[0138] It should be noted that the battery pack is, for example, a battery module or a battery pack.

[0139] According to another aspect of this application, an electrical device is provided, the electrical device comprising: a battery pack as described above. The battery pack is used to provide electrical energy to the electrical device.

[0140] The electrical equipment can be vehicles, various electronic devices, spacecraft, electric toys, and power tools, etc. Electronic devices include mobile phones, tablets, laptops, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0141] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A battery casing, characterized in that, include: Shell (10); Flange edge (13), said flange edge (13) is disposed at the circumferential edge of the housing (10); and Terminal assembly (20) is disposed on the housing (10). At least a portion of the terminal assembly (20) is located outside the first surface of the housing (10). 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. A clearance portion (21) is provided on the side of the terminal assembly (20) near the flange edge (13) of the housing (10).

2. The battery casing according to claim 1, characterized in that, The 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 disposed at the open end of the main body (11). The flange edge (13) includes a first flange edge (111) and a second flange edge (121). The first flange edge (111) is disposed on the circumferential edge of the opening end of the body (11), and the second flange edge (121) is disposed on the circumferential edge of the cover plate (12). The first flange edge (111) and the second flange edge (121) are sealed together.

3. The battery casing according to claim 2, characterized in that, The terminal assembly (20) includes a terminal (22) and a pole post (23) disposed on the terminal (22); The terminal (22) is disposed on the cover plate (12), the pole (23) is used to electrically connect with the battery cell, and the battery cell is sealed inside the housing (10).

4. The battery casing according to claim 3, characterized in that, The terminal assembly (20) further includes an insulating element (24) that wraps around the outside of the terminal (22) to isolate the terminal (22) from the cover plate (12).

5. The battery casing according to claim 4, characterized in that, The clearance portion (21) is provided on the side wall (221) of the terminal (22) near the flange edge (13).

6. The battery casing according to claim 5, characterized in that, The clearance portion (21) is a chamfered structure formed on the side wall (221) and near the flange edge (13), which allows external laser light to be directed from the chamfered structure toward the flange edge (13).

7. The battery casing according to claim 6, characterized in that, The chamfered 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 beveled surface of the beveled angle forms a set angle D1 with the first surface, where 0 < D1 < 90°.

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

10. The battery casing according to claim 8 or 9, characterized in that, On the plane where the height and length directions of the battery casing intersect, the beveled surface of the beveled angle is inclined, and the length of the beveled surface is H; The straight distance between the circumferential edge A of the flange edge (13) and the end B of the oblique surface is L. H, L and D1 satisfy the following relationship: 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 casing 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 oblique surface is: 0 < L < 3 mm.

12. The battery casing according to claim 10, characterized in that, The insulating element (24) covers the oblique surface of the oblique angle on the plane where the height and length directions of the battery casing intersect. The insulating element (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 casing according to claim 10, characterized in that, The flange edge (13) is bent toward the side away from the chamfer angle.

14. The battery casing 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 casing according to claim 13, characterized in that, The distance from the end B of the oblique cut surface to the starting end C of the bending of the flange edge (13) is L1, the length of the flange edge (13) is L2, and 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. L1, L2, L3 and D1 and H satisfy the following relationship: L1+L2+L3-H*cosD1≥2.

16. The battery casing according to claim 15, characterized in that, The bending angle formed by the flange edge (13) bending away from the oblique angle is D2. D2 satisfies the following relationship with L1, L2, D1 and H: H*cosD1≥sinD2*L2*180 / D2+L2*cosD2+L1.

17. A battery, characterized in that, include: Battery casing as described in any one of claims 1-16; and The battery cell is disposed inside the battery casing.

18. A battery pack, characterized in that, Includes the battery as described in 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 that connects to at least two of the batteries.

20. An electrical appliance, characterized in that, include: The battery pack as described in claim 18 or claim 19.

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