Convergence plate, battery, battery pack and electric device

Abstract

The invention discloses a confluence plate, a battery, a battery pack and a power utilization device, the confluence plate comprises a plate body, the diameter of the plate body is D1; the welding part is connected to the peripheral side of the disc body, the welding part comprises a welding section, the welding section extends in the circumferential direction of the disc body and is perpendicular to the disc body, the diameter of the cylindrical surface where the outer surface of the welding section is located is D2, and D2 / D1 is larger than or equal to 1 and smaller than or equal to 10. According to the confluence disc, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section is located and the diameter D1 of the disc body meets the condition that D2 / D1 is larger than or equal to 1 and smaller than or equal to 10, so that the size of a gap formed between the welding part and the inner peripheral wall of the shell can be increased; therefore, the electrolyte locally accumulated in the rolling groove area has larger space and chance to be communicated with the electrolyte at other positions in the shell, reverse flowing is realized, the electrolyte is prevented from being accumulated in the rolling groove, corrosion to a nickel layer of the battery shell is reduced, and the service life of the battery is prolonged.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a busbar, battery, battery pack and power supply device. Background Technology

[0002] In related technologies, the main body of the busbar in a lithium-ion battery is welded to the cell tab. The busbar is often designed with a vertical edge structure welded to the inner wall of the casing to form an electrical connection structure, enabling current to flow to the casing. In existing busbars, the vertical edge forms a certain gap with the casing sidewall. When the cell is exposed to high temperature for a long time, the cell expands, and the free electrolyte inside the cell flows into the grooved area inside the casing and accumulates.

[0003] However, due to the excessively small gap between the manifold vertical section and the casing, this gap provides a one-way channel for electrolyte accumulation in the grooved area. This means the electrolyte can flow downwards from the cell through the gap into the grooved area, but the electrolyte in the vertical edge area cannot flow back into the cell through this gap during later cycles. The residual electrolyte in the vertical edge of the grooved area accumulates over time, forming isolated electrolyte islands. During the cell's lifespan, this can corrode the nickel layer on the casing at these locations, leading to nickel ion dissolution and impacting the cell's long-term application. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a busbar that can increase the gap size formed between the welded part and the inner peripheral wall of the casing, reduce electrolyte accumulation at the groove, reduce corrosion of the nickel layer of the battery casing, and improve the battery's service life.

[0005] The present invention also proposes a battery comprising the aforementioned busbar.

[0006] The present invention also proposes a battery pack comprising the aforementioned busbar.

[0007] The present invention also proposes an electrical device, which includes the battery or battery pack described above.

[0008] According to an embodiment of the present invention, a busbar includes: a body with a diameter of D1; a welding portion connected to the outer periphery of the body, the welding portion including a welding segment extending along the circumferential direction of the body and perpendicular to the body, the diameter of the cylindrical surface of the outer surface of the welding segment being D2, and satisfying: 1≤D2 / D1≤10.

[0009] According to the present invention, by making the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welded section is located and the diameter D1 of the disk body satisfy 1≤D2 / D1≤10, the gap size formed between the welded part and the inner peripheral wall of the shell can be increased, so that the electrolyte locally accumulated in the groove area has more space and opportunity to communicate with the electrolyte in other locations in the shell, realizing reverse flow, avoiding the accumulation of electrolyte in the groove, reducing corrosion of the nickel layer of the battery shell, and improving the service life of the battery.

[0010] According to some embodiments of the present invention, the welding part further includes a connecting section, the two ends of which are respectively connected to the outer peripheral side of the disk body and the end of the welding section close to the disk body along the axial direction of the disk body.

[0011] In some embodiments of the present invention, the welding segment and the connecting line between the welding segment and the connecting segment are located on the same side in the axial direction of the disk body.

[0012] In some embodiments of the present invention, on a cross-section passing through the axis of the disk body, the angle between the line connecting the two ends of the connecting segment and the disk body is α, and satisfies: 90° < α < 180°.

[0013] In some embodiments of the present invention, the connecting segment is a flat plate structure, a curved plate structure, or a stepped structure.

[0014] In some embodiments of the present invention, the disk body is a holeless structure; or, the disk body is provided with a through hole that penetrates the disk body along the axial direction of the disk body, wherein the through hole is one or a plurality of holes spaced apart.

[0015] In some embodiments of the present invention, the total arc length of the outer surface of the welded section is L1, the circumference of the circle with diameter D2 is L2, and satisfies: 0.2≤L1 / L2≤1.

[0016] In some embodiments of the present invention, the welding segment is located on one side of the disk body in the axial direction. Along the axial direction of the disk body, the distance between the surface of the disk body away from the welding segment and the end of the welding segment away from the disk body is L3, and satisfies: 0.2mm≤L3≤5mm.

[0017] In some embodiments of the present invention, the welding portions are a plurality of portions spaced apart along the circumferential direction of the disc body.

[0018] In some embodiments of the present invention, the outer periphery of the disc body is provided with a notch, and the welded part is connected to the inner wall of the notch.

[0019] According to an embodiment of the present invention, a battery includes: a housing; a battery cell disposed within the housing; a busbar disposed within the housing; a welding section and the battery cell located on opposite sides of the busbar in the axial direction; the busbar and the battery cell being welded together; and the outer surface of the welding section being welded together with the inner peripheral wall of the housing. The outer peripheral wall of the housing has a groove extending in the circumferential direction of the housing, the groove being located on the side of the busbar facing away from the battery cell; one end of the welding section facing away from the busbar is bent toward the axis of the busbar under the action of the groove; a gap exists between the welding section and the inner peripheral wall of the housing, the gap being located on the side of the welding area between the welding section and the housing facing the battery cell.

[0020] According to the battery of the present invention, by setting the above-mentioned busbar, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welded section is located and the diameter D1 of the disk body satisfies 1≤D2 / D1≤10. This can increase the gap size formed between the welded part and the inner peripheral wall of the shell, so that the electrolyte locally accumulated in the groove area has more space and opportunity to communicate with the electrolyte in other positions in the shell, realize reverse flow, avoid the accumulation of electrolyte in the groove, reduce corrosion of the nickel layer of the battery shell, and improve the service life of the battery.

[0021] In some embodiments of the present invention, the gap is filled with an adhesive structural component.

[0022] The battery pack according to an embodiment of the present invention includes the battery described above.

[0023] According to the battery pack of the present invention, by setting the battery as described above, including the busbar as described above, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welded section is located and the diameter D1 of the disk body satisfies 1≤D2 / D1≤10. This can increase the gap size formed between the welded part and the inner peripheral wall of the shell, so that the electrolyte locally accumulated in the groove area has more space and opportunity to communicate with the electrolyte in other positions in the shell, realizing reverse flow, avoiding the accumulation of electrolyte in the groove, reducing corrosion of the nickel layer of the battery shell, improving the service life of the battery, and thus improving the service life and safety of the battery pack.

[0024] The electrical device according to an embodiment of the present invention includes the battery or the battery pack described above.

[0025] According to the embodiments of the present invention, by providing the above-mentioned battery pack or battery, including the above-mentioned busbar, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welded section is located and the diameter D1 of the disk body satisfies 1≤D2 / D1≤10. This can increase the gap size formed between the welded part and the inner peripheral wall of the shell, allowing the electrolyte locally accumulated in the groove area to have more space and opportunity to communicate with the electrolyte in other locations within the shell, achieving reverse flow, avoiding electrolyte accumulation at the groove, reducing corrosion of the nickel layer of the battery shell, and improving the battery's service life. This, in turn, improves the service life and safety of the battery pack, and further improves the service life and safety of the electrical device.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a perspective view of the busbar according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of the busbar according to an embodiment of the present invention; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a cross-sectional view of a battery according to an embodiment of the present invention; Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0029] Figure label: 100. Battery; 10. Busbar; 1. The trading range; 11. The gap; 2. Welding section; 21. Welding segment; 22. Connecting segment; 3. Gap; 20. Casing; 201. Casing body; 202. Groove; 203. Cover plate; 204. Seal; 30. Battery cells. Detailed Implementation

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] The following is for reference. Figures 1-5 The busbar 10 according to an embodiment of the present invention is described.

[0034] like Figures 1-3 As shown, the busbar 10 according to an embodiment of the present invention includes a disk body 1 and a welding part 2.

[0035] Specifically, the disk body 1 can be circular in shape, and the welding part 2 is connected to the outer periphery of the disk body 1. The welding part 2 includes a welding segment 21, which extends along the circumferential direction of the disk body 1 and is perpendicular to the disk body 1. Figure 4 As shown, when the busbar 10 is used for the battery 100, the battery 100 can be a cylindrical battery. The battery 100 can also include a housing 20 and a cell 30, wherein the cell 30 can be a wound core. The cell 30 and the busbar 10 are disposed inside the housing 20, and the cell 30 and the welding section 21 are located on both sides of the axial direction of the disk 1 (which can also be understood as the thickness direction of the disk 1). The disk 1 is welded to the tabs of the cell 30, and the outer surface of the welding section 21 is welded to the inner peripheral wall of the housing 20.

[0036] Furthermore, such as Figure 4 and Figure 5The housing 20 includes a housing body 201 and a cover plate 203. One axial end of the housing body 201 is open, and the cover plate 203 is adapted to cover the open end of the housing body 201. After the cover plate 203 is assembled onto the housing body 201, it is necessary to ensure the sealing between the housing body 201 and the cover plate 203. A sealing element 204 or similar structure needs to be provided between the cover plate 203 and the housing body 201. Typically, a groove 202 is provided at the end of the housing body 201 near the open end. The groove 202 is formed by a portion of the peripheral wall of the housing body 201 recessed inward. A protruding structure formed inside the housing body 201 corresponding to the position of the groove 202 can provide a precise positioning structure for the subsequent sealing of the battery cell 30. During the sealing process, the sealing element 204 and the cover plate 203 need to be tightly matched with the protruding structure of the groove 202 to ensure the sealing of the battery 100 and prevent electrolyte leakage or external moisture intrusion.

[0037] In this assembly, the battery cell 30 is located inside the casing 201, the busbar 10 is located on the side of the battery cell 30 facing the open end, and the welding section 21 is located on the side of the busbar 1 away from the battery cell 30. The welding section 21 is welded to the inner peripheral wall of the casing 201. During the assembly of the battery 100, the battery cell 30 and the busbar 10 are sequentially assembled into the casing 201. Then, a groove 202 is formed on the casing 201. Finally, the cover plate 203 and the seal 204 are assembled onto the casing 201. During the formation of the groove 202 on the casing 201, because part of the peripheral wall of the casing 201 is recessed towards the inside of the casing 20, the welding part 2 deforms, causing at least a portion of the end of the welding part 2 away from the busbar 1 to bend towards the inside of the casing 20. At the same time, a gap 3 is formed between the portion of the welding part 2 located on the side of the welding area between the welding section 21 and the inner peripheral wall of the casing 20, near the battery cell 30, and the inner peripheral wall of the casing 20.

[0038] In this application, the diameter of the disc 1 is D1, and the diameter of the cylindrical surface on which the outer surface of the welding section 21 is located is D2, satisfying: 1≤D2 / D1≤10. This allows adjustment of the deformable length of the portion between the welding section 21 and the disc 1, thereby adjusting the degree of deformation of the welding part 2 after the groove 202 is sealed. This adjusts the size of the gap 3 formed between the inner circumferential wall of the shell 20 and the welding section 21, and increases the size of the gap 3 between the welding part 2 and the inner circumferential wall of the shell 20. This provides more space and opportunity for the electrolyte locally accumulated in the groove 202 area to communicate with the electrolyte in other locations within the shell 20, achieving reverse flow. This prevents electrolyte accumulation in the groove 202, reduces corrosion of the nickel layer of the battery shell 20, and improves the service life of the battery 100.

[0039] Optionally, the ratio D2 / D1 between the diameter D2 of the cylindrical surface on which the outer surface of the welding section 21 is located and the diameter D1 of the disk 1 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, etc.

[0040] According to the embodiment of the present invention, the manifold 10, by making the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section 21 is located and the diameter D1 of the disk body 1 satisfy 1≤D2 / D1≤10, can increase the size of the gap 3 formed between the welding part 2 and the inner peripheral wall of the shell 20, so that the electrolyte locally accumulated in the groove 202 area has more space and opportunity to communicate with the electrolyte in other positions in the shell 20, realize reverse flow, avoid the accumulation of electrolyte in the groove 202, reduce the corrosion of the nickel layer of the shell 20 of the battery 100, and improve the service life of the battery 100.

[0041] In some embodiments of the present invention, such as Figures 1-3 As shown, the welding part 2 also includes a connecting section 22, the two ends of which are connected to the outer periphery of the disk body 1 and the end of the welding part 21 close to the disk body 1 along the axial direction of the disk body 1, respectively. This facilitates the connection of the welding part 21 to the disk body 1 and makes it easier to ensure that the diameter of the cylindrical surface of the outer surface of the welding part 21 is greater than or equal to the diameter of the disk body 1. It also facilitates the adjustment of the deformation length between the welding part 21 and the disk body 1, increasing the size of the gap 3 formed between the welding part 2 and the inner peripheral wall of the shell 20. This allows the electrolyte locally accumulated in the groove 202 area to have more space and opportunity to communicate with the electrolyte in other locations within the shell 20, achieving reverse flow, preventing electrolyte accumulation in the groove 202, reducing corrosion of the nickel layer of the shell 20 of the battery 100, and improving the service life of the battery 100.

[0042] Furthermore, such as Figures 1-3As shown, the welding section 21 and the connecting line between the welding section 21 and the connecting section 22 are located on one side of the axial direction of the disk body 1 and are on the same side. It can be understood that the end of the connecting section 22 connected to the welding section 21 is offset towards the axial direction of the disk body 1 relative to the end of the connecting section 22 connected to the disk body 1, and the connecting section 22 is inclined relative to the disk body 1 and the welding section 21. When the radial dimension of the disk body 1 is the same, the length of the connecting section 22 can be further increased, and the deformable length of the part between the welding section 21 and the disk body 1 can be better adjusted to adjust the degree of deformation of the welded part 2 after the groove 202 is sealed, thereby adjusting the size of the gap 3 formed between the inner peripheral wall of the shell 20 and the welding section 21. This increases the size of the gap 3 formed between the welded part 2 and the inner peripheral wall of the shell 20, allowing the electrolyte locally accumulated in the groove 202 area to have more space and opportunity to communicate with the electrolyte in other locations within the shell 20, achieving reverse flow, preventing electrolyte from accumulating in the groove 202, reducing corrosion of the nickel layer of the shell 20 of the battery 100, and improving the service life of the battery 100.

[0043] Furthermore, such as Figures 1-3 As shown, on the cross-section through the axis of the disk 1, the angle between the line connecting the two ends of the connecting section 22 and the disk 1 is α, and satisfies: 90° < α < 180°. Therefore, the bending angle of the connecting section 22 can be adjusted to adjust the deformation degree of the welded part 2 after the groove 202 is sealed, thereby adjusting the size of the gap 3 formed between the inner peripheral wall of the shell 20 and the welded section 21. This increases the size of the gap 3 formed between the welded part 2 and the inner peripheral wall of the shell 20, allowing the electrolyte locally accumulated in the groove 202 area to have more space and opportunity to communicate with the electrolyte in other locations within the shell 20, achieving reverse flow, preventing electrolyte accumulation in the groove 202, reducing corrosion of the nickel layer of the battery 100 shell 20, and improving the service life of the battery 100.

[0044] Optionally, the angle α between the line connecting the two ends of the connecting segment 22 and the disk body 1 can be 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, 150°, 155°, 160°, 165°, 170° or 175°, etc.

[0045] Specifically, when the connecting segment 22 is a flat plate structure, the angle between the line connecting the two ends of the connecting segment 22 and the disk 1 is the angle between the connecting segment 22 and the disk 1. When the connecting segment 22 is not a flat plate structure, this angle is measured according to the angle between the line connecting the two ends of the connecting segment 22 and the disk 1.

[0046] In some embodiments of the present invention, the connecting segment 22 is a flat plate structure, a curved plate structure, or a stepped structure. For example, in Figures 1-3In the example shown, the connecting segment 22 is a flat plate structure, extending along the circumferential direction of the disk body 1. Of course, the invention is not limited to this; as long as the welding between the manifold 10 and the inner wall of the housing 20 is ensured, the connecting segment 22 can also be a curved plate structure. For example, in the radially outward direction of the disk body 1, the connecting segment 22 can be an upwardly or downwardly convex arc-shaped plate structure. The connecting segment 22 can also be a stepped structure. For example, in the radially outward direction of the disk body 1, the connecting segment 22 can include one or more stepped structures, each extending along the circumferential direction of the disk body 1.

[0047] The deformation of the welded portion 2 after the groove 202 is sealed can be adjusted by changing the shape of the connecting section 22, thereby adjusting the size of the gap 3 formed between the inner peripheral wall of the housing 20 and the welded section 21. This increases the size of the gap 3 between the welded portion 2 and the inner peripheral wall of the housing 20, allowing the electrolyte locally accumulated in the groove 202 area to have more space and opportunity to communicate with the electrolyte in other locations within the housing 20, achieving reverse flow, preventing electrolyte accumulation in the groove 202, reducing corrosion of the nickel layer of the battery 100's housing 20, and improving the service life of the battery 100.

[0048] In some embodiments of the present invention, such as Figure 1 As shown, the disk body 1 has a non-perforated structure, meaning it is a complete plate-like structure without any through holes. This simplifies the structure and manufacturing process of the disk body 1, improves the production efficiency of the busbar 10, and reduces its processing cost.

[0049] In some other embodiments of the present invention, the disk body 1 is provided with a through hole that penetrates the disk body 1 along the axial direction of the disk body 1. The through hole facilitates the improvement of electrolyte flow capacity, facilitates the electrolyte to flow through the through hole to the side of the disk body 1 away from the battery cell 30, and also facilitates the electrolyte on the side of the disk body 1 away from the battery cell 30 to flow back to the battery cell 30 through the through hole.

[0050] Optionally, there may be one through hole or multiple through holes spaced apart. The number of through holes can be set as needed. When there is one through hole, it can be located at the center of the disc body 1. When the core has a mandrel, the through hole can also be used for the mandrel to pass through. When there are multiple through holes, they can be spaced apart along the circumferential direction of the disc body 1, or one through hole can be located at the center, and the remaining through holes can be spaced apart along the circumferential direction of the disc body 1.

[0051] The welding surface must meet the current-carrying capacity of the battery 100. This capacity is reflected in the area of ​​the welding region between the busbar 10 and the cell 30, as well as the design of the weld lines on the inner circumferential walls of the welding section 21 and the housing 20. In some embodiments of the present invention, the total arc length of the outer surface of the welding section 21 is L1, and the circumference of the circle with diameter D2 is L2, satisfying: 0.2 ≤ L1 / L2 ≤ 1. Therefore, in the circumferential direction of the busbar 1, the welding length between the welding section 21 and the housing 20 can be guaranteed, ensuring the current-carrying capacity between the busbar 10 and the housing 20.

[0052] When there is only one welding segment 21, the total arc length L1 of the outer surface of the welding segment 21 is the arc length of the outer surface of that one welding segment 21. When there are multiple welding segments 21 arranged along the circumferential direction of the disc body 1, the total arc length L1 of the outer surface of the welding segment 21 is the sum of the arc lengths of the outer surfaces of the multiple welding segments 21.

[0053] Optionally, the ratio L1 / L2 between the total arc length L1 of the outer surface of the welded section 21 and the circumference L2 of the circle with diameter D2 can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 or 1.

[0054] In some embodiments of the present invention, such as Figure 3 As shown, the welding section 21 is located on one side of the disk body 1 along the axial direction. Along the axial direction of the disk body 1, the distance between the surface of the disk body 1 facing away from the welding section 21 and the end of the welding section 21 facing away from the disk body 1 is L3, satisfying: 0.2mm ≤ L3 ≤ 5mm. Therefore, the size of the gap 3 formed between the inner peripheral wall of the housing 20 and the welding section 21 can be adjusted by adjusting the height and shape of the connecting section 22. This increases the size of the gap 3 formed between the welding section 2 and the inner peripheral wall of the housing 20, allowing more space and opportunity for the electrolyte locally accumulated in the groove 202 area to communicate with the electrolyte in other locations within the housing 20, achieving reverse flow, preventing electrolyte accumulation in the groove 202, reducing corrosion of the nickel layer of the battery 100's housing 20, and improving the service life of the battery 100.

[0055] Optionally, the distance L3 between the surface of the disk body 1 facing away from the welding section 21 and the end of the welding section 21 facing away from the disk body 1 can be 0.2mm, 0.5mm, 0.7mm, 1mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.7mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.7mm, or 5mm, etc.

[0056] In some embodiments of the present invention, such as Figure 1As shown, the welding parts 2 are multiple and spaced apart along the circumferential direction of the disk body 1. This reduces the area of ​​the welding parts 2 relative to a full circle, reduces the welding area between the welding parts 2 and the housing 20, improves welding efficiency, ensures the reliability of the connection between the busbar 10 and the housing 20, and ensures that the welding length between the busbar 10 and the housing 20 is not too short, thus ensuring the current carrying capacity of the battery 100.

[0057] exist Figure 1 In the example shown, there are three welded portions 2 spaced apart along the circumferential direction of the disk body 1. Of course, the present invention is not limited to this, and there may also be four or five welded portions 2, etc.

[0058] Optionally, the arc length of the outer surface of the welded section 21 can be 2mm-150mm. For example, it can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm or 150mm, etc.

[0059] In some embodiments of the present invention, such as Figure 1 As shown, the outer periphery of the disk 1 is provided with a notch 11, and the welded part 2 is connected to the inner wall of the notch 11. This allows the inner end of the welded part 2 in the radial direction of the disk 1 to be closer to the center of the disk 1. After the manifold 10 is welded to the housing 20 and when the groove 202 is sealed, the welded part 2 is more likely to deform. This allows adjustment of the size of the gap 3 formed between the inner peripheral wall of the housing 20 and the welded section 21. The size of the gap 3 formed between the welded part 2 and the inner peripheral wall of the housing 20 can be increased, giving the electrolyte locally accumulated in the groove 202 area more space and opportunity to communicate with the electrolyte in other locations in the housing 20, achieving reverse flow. This prevents the electrolyte from accumulating in the groove 202, reduces corrosion of the nickel layer of the housing 20 of the battery 100, and improves the service life of the battery 100.

[0060] Furthermore, such as Figure 1 As shown, along the circumferential direction of the disk 1, the two ends of the welded part 2 and the side wall of the notch 11 are spaced apart. Therefore, after the busbar 10 is welded to the housing 20 and when the groove 202 is sealed, the welded part 2 is more likely to deform. The size of the gap 3 formed between the inner peripheral wall of the housing 20 and the welded section 21 can be adjusted. The size of the gap 3 formed between the welded part 2 and the inner peripheral wall of the housing 20 can be increased, so that the electrolyte locally accumulated in the groove 202 area has more space and opportunity to communicate with the electrolyte in other positions in the housing 20, realizing reverse flow, avoiding the accumulation of electrolyte in the groove 202, reducing corrosion of the nickel layer of the housing 20 of the battery 100, and improving the service life of the battery 100.

[0061] The battery 100 according to an embodiment of the present invention is described below.

[0062] like Figure 4 and Figure 5 As shown, the battery 100 according to an embodiment of the present invention includes a housing 20, a battery cell 30, and the aforementioned busbar 10.

[0063] Specifically, the battery cell 30 is disposed within the housing 20, the busbar 10 is disposed within the housing 20, the welding section 21 and the battery cell 30 are located on opposite sides of the disk body 1 in the axial direction, the disk body 1 and the battery cell 30 are welded together, and the outer surface of the welding section 21 is welded together with the inner peripheral wall of the housing 20. The outer peripheral wall of the housing 20 is provided with a groove 202 extending in the circumferential direction of the housing 20, the groove 202 is located on the side of the disk body 1 away from the battery cell 30, the end of the welding section 21 away from the disk body 1 is bent toward the axis of the disk body 1 under the action of the groove 202, and there is a gap 3 between the welding part 2 and the inner peripheral wall of the housing 20, the gap 3 is located on the side of the welding area of ​​the welding section 21 and the housing 20 facing the battery cell 30.

[0064] Furthermore, the housing 20 includes a housing body 201 and a cover plate 203. One axial end of the housing body 201 is open, and the cover plate 203 is adapted to cover the open opening of the housing body 201. After the cover plate 203 is assembled onto the housing body 201, it is necessary to ensure the sealing between the housing body 201 and the cover plate 203. A sealing element 204 and other structures are required between the cover plate 203 and the housing body 201. Typically, a groove 202 is provided at the end of the housing body 201 near the open opening. The groove 202 is formed by a portion of the peripheral wall of the housing body 201 protruding inward. The protruding structure formed inside the housing body 201 can provide a high-precision positioning structure for the subsequent sealing of the battery cell 30. During the sealing process, the sealing element 204 and the cover plate 203 need to be tightly matched with the protruding structure of the groove 202 to ensure the sealing of the battery 100 and prevent electrolyte leakage or external moisture intrusion.

[0065] In this assembly, the battery cell 30 is located inside the casing 201, the busbar 10 is located on the side of the battery cell 30 facing the open end, and the welding section 21 is located on the side of the busbar 1 away from the battery cell 30. The welding section 21 is welded to the inner peripheral wall of the casing 201. During the assembly of the battery 100, the battery cell 30 and the busbar 10 are sequentially assembled into the casing 201. Then, a groove 202 is formed on the casing 201. Finally, the cover plate 203 and the seal 204 are assembled onto the casing 201. During the formation of the groove 202 on the casing 201, because part of the peripheral wall of the casing 201 is recessed towards the inside of the casing 20, the welding part 2 deforms, causing at least a portion of the end of the welding part 2 away from the busbar 1 to bend towards the inside of the casing 20. At the same time, a gap 3 is formed between the portion of the welding part 2 located on the side of the welding area between the welding section 21 and the inner peripheral wall of the casing 20, near the battery cell 30, and the inner peripheral wall of the casing 20.

[0066] In this application, the diameter of the disc 1 is D1, and the diameter of the cylindrical surface on which the outer surface of the welding section 21 is located is D2, satisfying: 1≤D2 / D1≤10. This allows adjustment of the deformable length of the portion between the welding section 21 and the disc 1, thereby adjusting the degree of deformation of the welding part 2 after the groove 202 is sealed. This adjusts the size of the gap 3 formed between the inner circumferential wall of the shell 20 and the welding section 21, and increases the size of the gap 3 between the welding part 2 and the inner circumferential wall of the shell 20. This provides more space and opportunity for the electrolyte locally accumulated in the groove 202 area to communicate with the electrolyte in other locations within the shell 20, achieving reverse flow. This prevents electrolyte accumulation in the groove 202, reduces corrosion of the nickel layer of the battery shell 20, and improves the service life of the battery 100.

[0067] According to the battery 100 of the present invention, by providing the above-mentioned manifold 10, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section 21 is located and the diameter D1 of the disk body 1 satisfies 1≤D2 / D1≤10. This can increase the size of the gap 3 formed between the welding part 2 and the inner peripheral wall of the shell 20, so that the electrolyte locally accumulated in the groove 202 area has more space and opportunity to communicate with the electrolyte in other positions in the shell 20, realize reverse flow, avoid the accumulation of electrolyte in the groove 202, reduce corrosion of the nickel layer of the shell 20 of the battery 100, and improve the service life of the battery 100.

[0068] In some embodiments of the present invention, the gap 3 is filled with an adhesive structural component. The adhesive structural component can be formed by applying adhesive to fill the gap 3. In this application, by increasing the gap 3 between the welded section 21 and the inner peripheral wall of the housing 20, it is easier to apply adhesive to fill the gap 3, thereby preventing electrolyte from flowing into the gap 3, preventing electrolyte from accumulating at the groove 202, reducing corrosion of the nickel layer of the housing 20 of the battery 100, and improving the service life of the battery 100.

[0069] The following describes a battery pack according to an embodiment of the present invention.

[0070] The battery pack according to an embodiment of the present invention includes the battery 100 described above.

[0071] According to the battery pack of the present invention, by setting the battery 100 as described above, including the busbar 10, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section 21 is located and the diameter D1 of the disk body 1 satisfies 1≤D2 / D1≤10. This can increase the size of the gap 3 formed between the welding part 2 and the inner peripheral wall of the shell 20, so that the electrolyte locally accumulated in the groove 202 area has more space and opportunity to communicate with the electrolyte in other positions in the shell 20, realize reverse flow, avoid the accumulation of electrolyte in the groove 202, reduce corrosion of the nickel layer of the shell 20 of the battery 100, improve the service life of the battery 100, and thus improve the service life and safety of the battery pack.

[0072] The following describes an electrical device according to an embodiment of the present invention.

[0073] The electrical device according to an embodiment of the present invention includes the battery pack or battery 100 described above.

[0074] According to the embodiments of the present invention, by providing the above-mentioned battery pack or battery 100, including the above-mentioned manifold 10, the ratio D2 / D1 between the diameter D2 of the cylindrical surface where the outer surface of the welding section 21 is located and the diameter D1 of the disk body 1 satisfies 1≤D2 / D1≤10. This can increase the size of the gap 3 formed between the welding part 2 and the inner peripheral wall of the housing 20, so that the electrolyte locally accumulated in the groove 202 area has more space and opportunity to communicate with the electrolyte in other positions in the housing 20, realizing reverse flow, avoiding the accumulation of electrolyte in the groove 202, reducing corrosion of the nickel layer of the housing 20 of the battery 100, improving the service life of the battery 100, thereby improving the service life and safety of the battery pack, and further improving the service life and safety of the electrical device.

[0075] In some embodiments of the present invention, the electrical device may be a vehicle, aircraft, watercraft, or household appliance, etc.

[0076] Other configurations and operations of the electrical device and battery pack according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0077] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0078] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A busbar, characterized in that, include: The disk body (1) has a diameter of D1; Welding part (2), the welding part (2) is connected to the outer periphery of the disk body (1), the welding part (2) includes a welding section (21), the welding section (21) extends along the circumferential direction of the disk body (1) and is perpendicular to the disk body (1), the diameter of the cylindrical surface on which the outer surface of the welding section (21) is located is D2, and satisfies: 1≤D2 / D1≤10.

2. The busbar according to claim 1, characterized in that, The welding part (2) further includes a connecting section (22), the two ends of which are respectively connected to the outer periphery of the disk body (1) and the end of the welding section (21) close to the disk body (1) along the axial direction of the disk body (1).

3. The busbar according to claim 2, characterized in that, The welding section (21) and the connecting line between the welding section (21) and the connecting section (22) are located on the same side of the axial direction of the disk body (1).

4. The busbar according to claim 3, characterized in that, On the cross section passing through the axis of the disk body (1), the angle between the line connecting the two ends of the connecting segment (22) and the disk body (1) is α, and satisfies: 90°<α<180°.

5. The busbar according to claim 2, characterized in that, The connecting section (22) is a flat plate structure, a curved plate structure, or a stepped structure.

6. The busbar according to any one of claims 1-5, characterized in that, The disk body (1) has a non-porous structure; Alternatively, the disk body (1) may have a through hole extending through the disk body (1) along the axial direction of the disk body (1), wherein the through hole is one or multiple holes spaced apart.

7. The busbar according to any one of claims 1-5, characterized in that, The total arc length of the outer surface of the welded section (21) is L1, and the circumference of the circle with diameter D2 is L2, and satisfies: 0.2≤L1 / L2≤1.

8. The busbar according to any one of claims 1-5, characterized in that, The welding section (21) is located on one side of the disk body (1) in the axial direction. Along the axial direction of the disk body (1), the distance between the surface of the disk body (1) away from the welding section (21) and the end of the welding section (21) away from the disk body (1) is L3, and satisfies: 0.2mm≤L3≤5mm.

9. The busbar according to any one of claims 1-5, characterized in that, The welding parts (2) are a plurality of those spaced apart along the circumferential direction of the disc body (1).

10. The busbar according to any one of claims 1-5, characterized in that, The outer periphery of the disc body (1) is provided with a notch (11), and the welding part (2) is connected to the inner wall of the notch (11).

11. A battery, characterized in that, include: Shell (20); A battery cell (30) is disposed within the housing (20); According to any one of claims 1-10, the busbar (10) is disposed inside the housing (20), the welding section (21) and the battery cell (30) are located on opposite sides of the disk body (1) in the axial direction, the disk body (1) is welded to the battery cell (30), and the outer surface of the welding section (21) is welded to the inner peripheral wall of the housing (20); The outer peripheral wall of the housing (20) is provided with a groove (202) extending along the circumferential direction of the housing (20). The groove (202) is located on the side of the disc (1) away from the battery cell (30). The end of the welding section (21) away from the disc (1) is bent toward the axis of the disc (1) under the action of the groove (202). There is a gap (3) between the welding part (2) and the inner peripheral wall of the housing (20). The gap (3) is located on the side of the welding area of ​​the welding section (21) and the housing (20) toward the battery cell (30).

12. The battery according to claim 11, characterized in that, The gap (3) is filled with a glue structure.

13. A battery pack, characterized in that, Includes the battery (100) according to claim 11 or 12.

14. An electrical appliance, characterized in that, Includes the battery (100) according to claim 11 or 12 or the battery pack according to claim 13.

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