Battery assembly, battery structure, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a battery assembly, a battery structure, a battery pack and electric equipment, the battery assembly comprises a battery cell and a collector plate, the battery cell is provided with a tab, and the tab is connected to the collector plate; a first connecting part is arranged on one side, close to the current collecting plate, of each tab; a second connecting part is arranged on one side, close to the current collecting plate, of each tab; a second connecting part is arranged on one side, close to the tab, of the collector plate, is opposite to the first connecting part, and is connected to the first connecting part; one of the first connecting part and the second connecting part is a groove, a welding agent is arranged in the groove, and the first connecting part is connected to the second connecting part through the welding agent. Therefore, the first connecting part or the second connecting part is provided with the groove, and the groove can be filled with the welding agent, so that the first connecting part and the second connecting part are welded through the welding agent, the requirement on the welding process is low, the convenience of product manufacturing is improved, and the stable and reliable connection between the tab of the battery cell and the collector plate is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a battery assembly, a battery structure, a battery pack and a power utilization device. BACKGROUND

[0002] Batteries are used to provide electric energy and are important power sources. With the development of science and technology and the improvement of people's living standards, people have put forward higher and higher requirements for the assembly structure of batteries.

[0003] In the prior art, a battery structure usually comprises a battery cell and a current collecting disc. The end of the battery cell has a tab, and the tab can be flattened and welded with the current collecting disc to realize assembly.

[0004] The tab is usually welded to the current collecting disc by spot welding technology. However, the surface flatness of the tab is poor after being flattened, and there is a cavity region between the tab and the current collecting disc. When the tab and the current collecting disc are spot welded, the current collecting disc may be penetrated, the tab may be burned, and virtual welding may occur, which leads to poor connection reliability of the battery cell and the current collecting disc and limited overcurrent area, thereby restricting the performance of the product. CONTENT OF THE UTILITY MODEL

[0005] In view of the above problems, the utility model is provided to overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the application is implemented as follows:

[0007] In a first aspect, an embodiment of the application provides a battery assembly, which comprises a battery cell and a current collecting disc, the battery cell has a tab, and the tab is connected to the current collecting disc.

[0008] The tab is provided with a first connecting portion on one side close to the current collecting disc.

[0009] The current collecting disc is provided with a second connecting portion on one side close to the tab, the second connecting portion is oppositely arranged with the first connecting portion, and the second connecting portion is connected to the first connecting portion.

[0010] One of the first connecting portion and the second connecting portion is a groove, the groove is provided with a welding agent, and the first connecting portion is connected to the second connecting portion through the welding agent.

[0011] Optionally, the first connecting portion is a protruding portion, and the second connecting portion is a groove.

[0012] Alternatively, the first connecting portion is a groove, and the second connecting portion is a protruding portion.

[0013] Optionally, the protrusion is a ring-shaped protrusion, the ring-shaped protrusion is arranged around the center of the current collecting plate, the groove is a ring-shaped groove, the ring-shaped groove is arranged around the center of the current collecting plate, and the ring-shaped protrusion is connected to the ring-shaped groove through the welding agent.

[0014] Optionally, the first connecting part is a flattened part, the second connecting part is a groove, the welding agent is filled in the groove, and the flattened part is connected to the second connecting part through the welding agent.

[0015] Optionally, the current collecting plate is provided with a thickening part on the side away from the tab, and the thickening part is arranged at a position corresponding to the second connecting part.

[0016] Optionally, the current collecting plate is provided with a weight-reducing hole, and the weight-reducing hole is arranged at a position away from the second connecting part.

[0017] Optionally, the second connecting part is a ring-shaped connecting part arranged around the center of the current collecting plate, and the number of the weight-reducing holes is a plurality, the plurality of weight-reducing holes are arranged at intervals along the side of the second connecting part away from the center of the current collecting plate, and the plurality of weight-reducing holes are arranged at intervals along the outer periphery of the second connecting part.

[0018] Optionally, the current collecting plate is provided with a first reinforcing rib on the side away from the tab, the first reinforcing rib extends in a direction from the edge of the current collecting plate to the center of the current collecting plate, and one end of the first reinforcing rib extends and is connected to the second connecting part.

[0019] Optionally, the number of the first reinforcing ribs is a plurality, and the plurality of first reinforcing ribs are arranged at intervals.

[0020] Optionally, the current collecting plate includes a tab lead-out sheet, the current collecting plate is provided with a bent edge, and the tab lead-out sheet is connected to the bent edge and bent to the side of the current collecting plate away from the tab.

[0021] Optionally, the current collecting plate is provided with a second reinforcing rib, the second reinforcing rib is arranged on the side of the current collecting plate away from the tab, and the second reinforcing rib is arranged opposite to the tab lead-out sheet to support the tab lead-out sheet when bent.

[0022] Optionally, the second reinforcing rib is an arc-shaped reinforcing rib, and the arc-shaped reinforcing rib extends around the outer periphery of the second connecting part.

[0023] Optionally, the welding agent is a brazing filler metal.

[0024] In a second aspect, an embodiment of the present application provides a battery structure, which includes a shell, a battery cell, a post, a cover plate, and the battery assembly.

[0025] The battery assembly is connected to an end of the battery cell, the pole is connected to a tab lead-out piece of the current collector of the battery assembly, and the cover plate is connected to the pole and the shell.

[0026] Optionally, the battery structure comprises a first spacer and a second spacer, the first spacer is connected between the cover plate and the pole, the second spacer is arranged in the shell, and the second spacer is arranged between the cover plate and the battery cell.

[0027] Optionally, the battery structure comprises a support, the support is abutted against the second spacer, and the support is abutted against the tab through the weight-reducing hole of the current collector.

[0028] In a third aspect, the embodiments of the present application provide a battery pack, which comprises the battery structure.

[0029] In a fourth aspect, the embodiments of the present application provide a power consumption device, which comprises the battery pack or the battery structure.

[0030] In the embodiments of the present application, the battery assembly comprises a battery cell and a current collector, the battery cell has a tab, the tab is connected to the current collector, one side of the tab close to the current collector is provided with a first connecting part, one side of the current collector close to the tab is provided with a second connecting part, the second connecting part is arranged opposite to the first connecting part, and the second connecting part is connected to the first connecting part, one of the first connecting part and the second connecting part is a groove, a welding agent is arranged in the groove, and the first connecting part is connected to the second connecting part through the welding agent. In this way, by arranging the groove in the first connecting part or the second connecting part, the welding agent can be filled in the groove, so that the first connecting part and the second connecting part are welded through the welding agent, for example, brazing, and the welding process has a lower requirement, the product manufacturing is improved in simplicity, and the connection between the tab of the battery cell and the current collector is more stable and reliable. The phenomenon that the current collector is fused through and the tab is burned, and the virtual welding phenomenon are avoided, the connection reliability of the battery cell and the current collector is improved, and the overcurrent area of the battery cell and the current collector is improved, and the product performance is improved.

[0031] Additional aspects and advantages of the present application will be made apparent from the following description of embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and be more readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0033] Figure 1 is a structural schematic view of a current collecting disc of a battery assembly according to an embodiment of the present application;

[0034] Figure 2 is another structural schematic view of a current collecting disc of a battery assembly according to an embodiment of the present application;

[0035] Figure 3 is a sectional structural schematic view of a current collecting disc of a battery assembly according to an embodiment of the present application;

[0036] Figure 4 is a structural schematic view of a tab of a battery assembly according to an embodiment of the present application;

[0037] Figure 5 is a top view of a battery structure according to an embodiment of the present application;

[0038] Figure 6 is a sectional structural schematic view of the battery structure according to an embodiment of the present application; Figure 5 of the battery structure according to an embodiment of the present application;

[0039] Figure 7 is an enlarged structural schematic view of the loop diagram M of the battery structure according to an embodiment of the present application; Figure 6

[0040] Figure 8 is a sectional structural schematic view of the battery structure according to an embodiment of the present application; Figure 5 of the battery structure according to an embodiment of the present application;

[0041] Figure 9 is an enlarged structural schematic view of the loop diagram N of the battery structure according to an embodiment of the present application; Figure 8

[0042] Figure 10 is a partially enlarged structural schematic view of a battery structure according to an embodiment of the present application.

[0043] Reference signs: 10 - tab; 20 - current collecting disc; 11 - first connecting portion; 21 - second connecting portion; 22 - thickened portion; 23 - weight-reducing hole; 24 - first reinforcing rib; 25 - tab lead-out piece; 26 - bent edge; 27 - second reinforcing rib; 30 - shell; 40 - battery cell; 41 - pole; 50 - cover plate; 51 - first spacer; 52 - second spacer; 53 - support member. DETAILED DESCRIPTION

[0044] ​​The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are intended to explain the present application, and are not to be understood as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0045] The terms "first", "second" in the description and claims of the present application can explicitly or implicitly include one or more features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in a "or" relationship.

[0046] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0047] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] Referring to Figures 1 to 7 , a schematic diagram of a battery assembly and its application in a battery structure is shown, the battery assembly can specifically include: an electric core 40 and a current collecting disc 20, the electric core 40 has a tab 10, and the tab 10 is connected to the current collecting disc 20;

[0049] The tab 10 is provided with a first connecting portion 11 on the side close to the current collecting disc 20;

[0050] The second connecting part 21 is arranged opposite to the first connecting part 11 and is connected to the first connecting part 11.

[0051] One of the first connecting part 11 and the second connecting part 21 is a groove, and the groove is filled with a welding agent, and the first connecting part 11 is connected to the second connecting part 21 through the welding agent.

[0052] In the embodiment, the groove is arranged on the first connecting part 11 or the second connecting part 21, the groove is filled with the welding agent, and the first connecting part 11 is welded to the second connecting part 21 through the welding agent, for example, brazing, and the welding process has low requirements, the product is easy to manufacture, the connection between the tab 10 and the current collecting plate 20 of the battery cell 40 is stable and reliable, the surface flatness of the tab 10 is not good after being rolled flat, and there is a cavity region between the tab 10 and the current collecting plate 20, the current collecting plate 20 is easily fused, the tab 10 is easily burned, and the phenomenon of false welding is easily formed when the tab 10 and the current collecting plate 20 are welded, the connection reliability of the battery cell 40 and the current collecting plate 20 is improved, the overcurrent area of the battery cell 40 and the current collecting plate 20 is improved, and the product performance is improved.

[0053] For example, in the embodiment, the battery assembly can be applied to a cylindrical battery cell, as shown in FIG. 1. Figure 4 As shown in FIG. 2, a protruding part can be arranged on the side of the tab 10 close to the current collecting plate 20 as the first connecting part 11. Figure 1 As shown in FIG. 3, a groove can be arranged on the side of the current collecting plate 20 close to the tab 10 as the second connecting part 21. Figure 3 As shown in FIG. 4, the protruding part on the tab 10 is embedded in the groove of the current collecting plate 20 and is welded through the welding agent, the connection between the tab 10 and the current collecting plate 20 is reliable, and the current transmission is realized.

[0054] In addition, in the embodiment, a groove can be arranged on the side of the tab 10 close to the current collecting plate 20 as the first connecting part 11, and a protruding part can be arranged on the side of the current collecting plate 20 close to the tab 10 as the second connecting part 21, the protruding part on the current collecting plate 20 is embedded in the groove of the tab 10 and is welded through the welding agent, the connection between the tab 10 and the current collecting plate 20 is reliable, and the current transmission is realized, and the embodiment is not limited in this regard.

[0055] Optionally, in the embodiment of the present application, the protruding part is a ring-shaped protruding part, which is arranged around the center of the current collecting plate 20; the groove is a ring-shaped groove, which is arranged around the center of the current collecting plate 20, and the ring-shaped protruding part is connected to the ring-shaped groove through the welding agent. In this way, the ring-shaped protruding part and the ring-shaped groove enable the tab 10 and the current collecting plate 20 to be connected at the circumferentially distributed circular ring positions. Compared with the point welding connection between the tab 10 and the current collecting plate 20 in the related art, the embodiment of the present application greatly increases the connection area between the tab 10 and the current collecting plate 20, and further improves the flow area therebetween, so that the flow heat generation of the battery assembly during the working process is more uniform.

[0056] Specifically, in the embodiment of the present application, the current collecting plate 20 is generally circular in the cylindrical battery structure, and therefore the center of the current collecting plate refers to the center of the circle. In addition, in other battery structures, the current collecting plate 20 can be other shapes, such as a rectangle or other polygons, etc., and the center of the current collecting plate is the geometric center.

[0057] In the embodiment of the present application, as an example, Figure 3 As shown in the figure, the radius of the ring-shaped groove is R2, which can be any value in the range of 20-22.5 mm, such as 20 mm, 21 mm, 22 mm or 22.5 mm, and can also be 18 mm or 25 mm, etc., which can be set according to actual needs, and the embodiment of the present application does not limit the specific value of the radius R2 of the ring-shaped groove. In the case of a circular current collecting plate 20, the radius of the current collecting plate 20 is R1, which can be any value in the range of 25-40 mm, such as 25 mm, 30 mm, 35 mm or 40 mm, and can also be 20 mm or 45 mm, etc., which can be set according to actual needs, and the embodiment of the present application does not limit the specific value of the radius R1 of the current collecting plate 20.

[0058] In other optional embodiments of the present application, the first connecting part 11 can also be a flattened part, the second connecting part 21 is a groove, the welding agent is filled in the groove, and the flattened part is connected to the second connecting part 21 through the welding agent, which can also achieve a more reliable connection and current transmission between the tab 10 and the current collecting plate 20.

[0059] Specifically, in the embodiment of the present application, the flattened part refers to the plane of the tab 10 after being flattened, and the welding agent can fill the entire groove, so that the plane of the flattened part of the tab 10 and the welding agent on the top of the groove are connected as an integral structure.

[0060] In the embodiment of the present application, the battery assembly comprises the battery cell 40, and the tab 10 is arranged at the end of the battery cell 40 and used to be connected with the current collector 20 to realize circuit conduction. For example, the tab 10 can be a positive tab 10 or a negative tab 10, and the specific type of the tab 10 is not limited in the embodiment of the present application. For example, the tab 10 can be subjected to a rubbing process and then be brazed with the current collector 20 to realize electrical connection between the tab 10 and the current collector 20. In addition, the tab 10 can also be laser spot welded with the current collector 20, and the specific connection mode of the tab 10 and the current collector 20 is not limited in the embodiment of the present application.

[0061] In the embodiment of the present application, for example, the second connecting portion 21 can be a circular ring, an ellipse, a rectangle, a segmented circular ring or a segmented ellipse, and the like, and the specific shape of the second connecting portion 21 is not limited in the embodiment of the present application. The shape of the first connecting portion 11 is matched with the shape of the second connecting portion 21, that is, the first connecting portion 11 can be a circular ring, an ellipse, a rectangle, a segmented circular ring or a segmented ellipse, and the like, and the specific shape of the first connecting portion 11 is not limited in the embodiment of the present application.

[0062] For example, in the embodiment of the present application, the depth of the groove can be any value in the range of 0.5-2 mm, such as 0.5 mm, 1 mm, 2 mm, 0.3 mm or 2.5 mm, and the like, which can be set according to actual needs, and the specific value of the depth of the groove is not limited in the embodiment of the present application. The width of the groove can be any value in the range of 1-3 mm, such as 1 mm, 2 mm, 3 mm, 0.5 mm or 3.5 mm, and the like, which can be set according to actual needs, and the specific value of the width of the groove is not limited in the embodiment of the present application.

[0063] For example, in the embodiment of the present application, the welding agent can be a brazing filler metal, so that the current collector 20 is brazed with the tab 10, which is convenient and reliable. In addition, the welding agent can also be other materials, and the specific type of the welding agent is not limited in the embodiment of the present application. For example, the thickness of the welding agent can be any value in the range of 0.5-1.5 mm, and the width of the welding agent can be any value in the range of 1-3 mm, and the specific thickness and width of the welding agent are not limited in the embodiment of the present application.

[0064] In the embodiment of the present application, optionally, a thickened portion 22 is provided on the side of the current collecting disc 20 facing away from the tab 10, and the thickened portion 22 is provided at a position corresponding to the second connecting portion 21. Specifically, the thickened portion 22 being provided at a position corresponding to the second connecting portion 21 means that the thickened portion 22 is provided at a position on the current collecting disc 20 where the second connecting portion 21 is provided, that is, the thickened portion 22 is provided on the back side of the second connecting portion 21. In this way, the structural strength of the second connecting portion 21 is enhanced by the thickened portion 22, thereby preventing the solder from melting through the current collecting disc 20 during welding. For example, in the case where the second connecting portion 21 of the current collecting disc 20 is a groove, the thickened portion 22 is connected to the bottom of the groove to provide structural reinforcement for the groove.

[0065] Optionally, in this embodiment of the present application, the current collecting tray 20 is provided with a weight-reducing hole 23, spaced apart from the second connecting portion 21. This hole 23 can be adapted to connect to the battery cover spacer. This reduces the weight of the current collecting tray 20, contributing to the lightweight design of the product. Furthermore, during battery assembly, the inner spacer of the battery cover can be inserted into the weight-reducing hole 23 to support the interior of the battery cell 40 and prevent shaking.

[0066] For example, in the embodiment of the present application, the weight-reducing hole 23 is spaced apart from the second connecting portion 21, such as Figure 3 As shown, the spacing between the lightening hole 23 and the second connecting portion 21 is L3, which is greater than 2 mm, such as 2.5 mm, 3 mm, or 3.5 mm, etc., and can be set according to actual needs. The embodiment of the present application does not limit the specific value of the spacing L3 between the lightening hole 23 and the second connecting portion 21. In addition, the distance between the lightening hole 23 and the edge of the current collecting plate 20 is L1, which can be used in the area where the sub-flat tab 10 may warp. L1 is greater than 2 mm, such as 2.5 mm, 3 mm, or 3.5 mm, etc., and can be set according to actual needs. The embodiment of the present application does not limit the specific value of the distance L1 between the lightening hole 23 and the edge of the current collecting plate 20.

[0067] Optionally, in the embodiment of the present application, the second connection portion 21 is an annular connection portion disposed around the center of the current collecting disc 20, and the number of weight-reducing holes 23 is multiple. The multiple weight-reducing holes 23 are spaced apart along a side of the second connection portion 21 away from the center of the current collecting disc 20, and the multiple weight-reducing holes 23 are spaced apart along the periphery of the second connection portion 21. In this way, the multiple weight-reducing holes 23 can enhance the weight-reducing effect on the current collecting disc 20, further improving lightweighting. In addition, the multiple weight-reducing holes 23 are spaced apart along the periphery of the second connection portion 21 to avoid interference between the weight-reducing holes 23 and the second connection portion 21. For example, the multiple weight-reducing holes 23 can be distributed symmetrically or evenly, and the embodiment of the present application does not limit the specific distribution method of the multiple weight-reducing holes 23.

[0068] In the embodiment of the present application, the weight-reducing hole 23 is optionally an annular hole, and the second connecting portion 21 is an annular connecting portion. The annular hole is disposed on the outer periphery of the annular connecting portion and is coaxial with the annular connecting portion. That is, the center of the annular hole and the center of the annular connecting portion coincide. This ensures a more rational layout of the weight-reducing hole 23 and the second connecting portion 21, and improves the structural strength of the collecting plate 20.

[0069] Optionally, in the embodiment of the present application, a first reinforcing rib 24 is provided on the side of the current collecting disk 20 facing away from the tab 10. The first reinforcing rib 24 extends from the edge of the current collecting disk 20 to the center of the current collecting disk 20, and one end of the first reinforcing rib 24 extends and is connected to the second connecting portion 21. For example, when the current collecting disk 20 is circular, elliptical, or annular, one end of the first reinforcing rib 24 can extend and connect to the thickened area, and the other end of the first reinforcing rib 24 can extend to the edge of the current collecting disk 20 or a position close to the edge, forming a strip-like structure. This structure strengthens the current collecting disk 20 in the radial direction, improves the structural strength of the current collecting disk 20, and can also be used to absorb the planar deformation generated by the tab lead 25 during the bending process.

[0070] For example, in the embodiment of the present application, the thickness of the first reinforcing rib 24 can be any value between 0.2 and 1 mm, such as 0.2 mm, 0.5 mm, 0.8 mm or 1 mm, or 1.5 mm, etc. The embodiment of the present application does not limit the specific thickness of the first reinforcing rib 24.

[0071] Optionally, in the embodiment of the present application, there are multiple first reinforcing ribs 24, and the multiple first reinforcing ribs 24 are arranged at intervals. The multiple first reinforcing ribs 24 enhance the structural reinforcement of the collecting plate 20. For example, Figure 2 As shown, the number of the first reinforcing ribs 24 is 4. In addition, the number of the first reinforcing ribs 24 can also be 3, 5, 6 or 8, etc., which can be set based on actual needs. The embodiment of the present application does not limit the specific number of the first reinforcing ribs 24.

[0072] In the embodiment of the present application, the current collecting plate 20 may optionally include a tab lead-out piece 25. The current collecting plate 20 may be provided with a bent edge 26. The tab lead-out piece 25 is connected to the bent edge 26 and bent to the side of the current collecting plate 20 away from the tab 10. The tab lead-out piece 25 is used to connect to the pole 41 of the battery structure. Figure 3 As shown, the tab lead-out piece 25 can be bent twice. In addition, the tab lead-out piece 25 can also be bent once or three times, etc., which can be set according to actual needs. The embodiment of the present application does not limit the specific bending method of the tab lead-out piece 25.

[0073] Optionally, in the embodiment of the present application, the current collecting plate 20 is provided with a second reinforcing rib 27, the second reinforcing rib 27 is connected to the side of the current collecting plate 20 away from the tab 10, and the second reinforcing rib 27 is arranged opposite to the tab lead-out sheet 25 to support the tab lead-out sheet 25 when it is bent. In this way, the second reinforcing rib 27 reliably supports the tab lead-out sheet 25, avoiding the tab lead-out sheet 25 from being recessed in the current collecting plate 20.

[0074] For example, in the embodiment of the present application, the second reinforcing rib 27 is an arc-shaped reinforcing rib extending around the outer periphery of the second connecting portion 21. Specifically, the arc-shaped reinforcing rib 27 means that the second reinforcing rib 27 has an arc, extending along the arc direction, so that the second reinforcing rib 27 is more fitted to the shape of the current collecting plate 20, and can have a better supporting effect on the tab lead-out sheet 25 in a larger range.

[0075] For example, in the embodiment of the present application, the specific assembly steps of the battery assembly can be: first, load the battery cell 40 into the flattening device to perform the flattening process on the tab 10, and extrude to form an annular protruding portion as the first connecting portion 11. Then, place the current collecting plate 20 on the brazing device and fix it, place the side of the current collecting plate 20 provided with the annular groove above, corresponding to the annular protruding portion of the tab 10. Then, put the filler metal into the annular groove, fix the battery cell 40 with the clamp, place the annular protruding portion of the tab 10 in the annular groove of the current collecting plate 20, start the brazing device, and braze and connect the tab 10 and the current collecting plate 20. Further, coat the battery cell 40 and put it into the shell, then perform the laser welding connection of the current collecting plate 20 and the pole 41, then fold the tab 10 of the battery cell 40 and assemble the cover plate 50 on the shell, and finally perform the shell cover sealing welding of the cover plate 50 and the shell 30, to complete the assembly of the battery assembly.

[0076] In summary, the battery assembly described in the embodiment of the present application can at least have the following advantages:

[0077] In the embodiment of the present application, the battery assembly comprises: an electric core and a current collector plate, the electric core has a tab, the tab is connected to the current collector plate, the tab is provided with a first connecting portion near one side of the current collector plate, the current collector plate is provided with a second connecting portion near one side of the tab, the second connecting portion is oppositely arranged with the first connecting portion, and the second connecting portion is connected to the first connecting portion, one of the first connecting portion and the second connecting portion is a groove, the groove is provided with a welding agent, and the first connecting portion is connected to the second connecting portion through the welding agent. In this way, by arranging a groove in the first connecting portion or the second connecting portion, the welding agent can be filled in the groove, so that the first connecting portion and the second connecting portion are welded through the welding agent, such as brazing, and the welding process has a lower requirement, the product manufacturing is improved in simplicity, and the connection between the tab of the electric core and the current collector plate is more stable and reliable. The surface flatness of the tab after rubbing is not good, and there is a cavity area between the tab and the current collector plate, which reduces the phenomenon that the current collector plate is melted through and the tab is burned when the two are welded, and forms a virtual welding, improves the connection reliability of the electric core and the current collector plate, and is also beneficial to improve the flow area of the two, and improve the product performance.

[0078] Reference Figures 8 to 10 , a schematic diagram of a battery structure is shown, the battery structure comprises a shell 30, an electric core 40, a pole 41, a cover plate 50 and the battery assembly; the electric core 40 is arranged in the shell 30, the tab 10 of the battery assembly is connected to the end of the electric core 40, the pole 41 is connected to the tab lead-out sheet 25 of the current collector plate 20 of the battery assembly, and the cover plate 50 is connected to the pole 41 and the shell 30. In this way, the electric core 40, the pole 41 and the battery assembly are protected and closed by the shell 30 and the cover plate 50, the pole 41 is connected to the tab lead-out sheet 25 of the current collector plate 20 of the battery assembly, and the reliable transmission of the circuit is realized.

[0079] For example, in the embodiment of the present application, the battery assembly comprises positive and negative electrode sheets and a diaphragm, and the positive and negative electrode sheets and the diaphragm are wound to form a cylindrical electric core. In addition, the electric core 40 can also be a square electric core or a soft package type electric core, etc., and the specific shape of the electric core 40 can not be limited in the embodiment of the present application. For example, the electric core 40 can be a lithium ion electric core, a polymer lithium electric core or a lithium iron phosphate electric core, etc., and the specific type of the electric core 40 can also not be limited in the embodiment of the present application.

[0080] Optionally, in the embodiment of the present application, the battery structure comprises a first spacer ring 51 and a second spacer ring 52, the first spacer ring 51 is connected between the cover plate 50 and the pole 41, and the second spacer ring 52 is arranged in the shell 30 and is arranged between the cover plate 50 and the battery cell 40. In this way, the first spacer ring 51 is used to insulate the cover plate 50 and the pole 41 to avoid conduction, and the second spacer ring 52 is used to insulate the inner side of the cover plate 50 in the shell 30 and the battery cell to avoid conduction. For example, the first spacer ring 51 and the second spacer ring 52 can be made of insulating materials, and the specific materials of the first spacer ring 51 and the second spacer ring 52 are not limited in the embodiment of the present application.

[0081] In the embodiment of the present application, the battery structure comprises a support 53, the support 53 abuts against the second spacer ring 52 and abuts against the tab 10 through the weight-reducing hole 23 of the current collector plate 20. In this way, the support 53 provides reliable support for the inside of the battery cell 40, avoiding the inside of the battery cell 40 from shaking. For example, the support 53 can be a support column or a support rod, and the specific type of the support 53 is not limited in the embodiment of the present application.

[0082] In summary, the battery structure in the embodiment of the present application can have at least the following advantages:

[0083] In the embodiment of the present application, the battery structure comprises a shell, a battery cell, a pole, a cover plate, and the battery assembly; the battery cell is arranged in the shell, the tab of the battery assembly is connected to the end of the battery cell, the pole is connected to the tab lead-out sheet of the current collector plate of the battery assembly, and the cover plate is connected to the pole and the shell. The battery assembly comprises a battery cell and a current collector plate, the battery cell has a tab, the tab is connected to the current collector plate, one side of the tab close to the current collector plate is provided with a first connecting part, one side of the current collector plate close to the tab is provided with a second connecting part, the second connecting part is arranged opposite to the first connecting part, and the second connecting part is connected to the first connecting part; one of the first connecting part and the second connecting part is a groove, a welding agent is arranged in the groove, and the first connecting part is connected to the second connecting part through the welding agent. In this way, by arranging a groove in the first connecting part or the second connecting part, the welding agent can be filled in the groove, and then the first connecting part and the second connecting part are welded through the welding agent, for example, brazing, which has a lower requirement for the welding process, improves the simplicity of product manufacturing, realizes a more stable and reliable connection between the tab of the battery cell and the current collector plate, avoids the poor surface flatness of the tab after rolling and the existence of a cavity area between the tab and the current collector plate, reduces the phenomenon that the current collector plate is melted through and the tab is burned when the two are welded, improves the connection reliability of the battery cell and the current collector plate, and is also beneficial to improving the overcurrent area of the two, and improving the performance of the product.

[0084] The battery pack according to the embodiments of the present application can at least have the following advantages.

[0085] The battery pack according to the embodiments of the present application can at least have the following advantages.

[0086] In the embodiments of the present application, the battery pack comprises the battery structure, the battery structure comprises a shell, a battery cell, a pole, a cover plate and the battery assembly; the battery cell is arranged in the shell, the tab of the battery assembly is connected to the end of the battery cell, the pole is connected to the tab lead-out sheet of the current collector of the battery assembly, and the cover plate is connected to the pole and the shell. The battery assembly comprises a battery cell and a current collector, the battery cell has a tab, the tab is connected to the current collector, one side of the tab close to the current collector is provided with a first connecting part, one side of the current collector close to the tab is provided with a second connecting part, the second connecting part is arranged opposite to the first connecting part, and the second connecting part is connected to the first connecting part; one of the first connecting part and the second connecting part is a groove, a welding agent is arranged in the groove, and the first connecting part is connected to the second connecting part through the welding agent. In this way, by arranging the groove in the first connecting part or the second connecting part, the welding agent can be filled in the groove, so that the first connecting part and the second connecting part are welded through the welding agent, for example, brazing, and the requirement for the welding process is low, the product manufacturing is simple, the connection between the tab of the battery cell and the current collector is stable and reliable, the surface flatness of the tab after rubbing is not good, and there is a cavity area between the tab and the current collector, the current collector is easily fused through and the tab is easily burned when the two are welded, and virtual welding and other phenomena are formed, the connection reliability of the battery cell and the current collector is improved, and the overcurrent area of the two is also improved, and the product performance is improved.

[0087] The power consumption equipment according to the embodiments of the present application can at least have the following advantages.

[0088] For example, in the embodiments of the present application, the power consumption equipment can be a vehicle, an energy storage cabinet or an aircraft, and the like, and the specific type of the power consumption equipment can not be limited in the embodiments of the present application. The vehicle can specifically include a small car, a medium car, a three-door car, a truck, a trailer, a CDV (CXr Derived VXn, a van based on a car platform), an MPV (multi-purpose vehicle), an SUV (sport utility vehicle), and the like. The embodiments of the present application can not be limited in this regard.

[0089] The power consumption equipment according to the embodiments of the present application can at least have the following advantages.

[0090] In the embodiment of the present application, the battery pack includes the battery structure, the battery structure includes the shell, the cell, the pole, the cover plate and the battery assembly; the cell is arranged in the shell, the tab of the battery assembly is connected to the end of the cell, the pole is connected to the tab lead-out sheet of the current collector of the battery assembly, and the cover plate is connected to the pole and the shell. The battery assembly includes: the cell and the current collector, the cell has the tab, the tab is connected to the current collector, one side of the tab close to the current collector is provided with a first connecting part, one side of the current collector close to the tab is provided with a second connecting part, the second connecting part is arranged opposite to the first connecting part, and the second connecting part is connected to the first connecting part; one of the first connecting part and the second connecting part is a groove, the groove is provided with a welding agent, and the first connecting part is connected to the second connecting part through the welding agent. In this way, by arranging the groove in the first connecting part or the second connecting part, the welding agent can be filled in the groove, so that the first connecting part and the second connecting part are welded through the welding agent, such as brazing, and the welding process requirement is low, the product manufacturing is simple, the stable and reliable connection between the tab of the cell and the current collector is realized. The surface flatness of the tab is not good after being rubbed, and there is a cavity area between the tab and the current collector, the current collector is easily fused through and the tab is easily burned when the two are welded, and the phenomenon of false welding is formed, the connection reliability of the cell and the current collector is improved, and the overcurrent area of the two is also improved, and the product performance is improved.

[0091] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0092] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery assembly, characterized in that: The battery assembly comprises: a battery cell and a current collecting plate, wherein the battery cell has a tab connected to the current collecting plate; A first connecting portion is provided on a side of the tab close to the current collecting plate; A second connecting portion is provided on a side of the current collecting plate close to the pole lug, the second connecting portion is arranged opposite to the first connecting portion, and the second connecting portion is connected to the first connecting portion; One of the first connecting portion and the second connecting portion is a groove, solder is provided in the groove, and the first connecting portion is connected to the second connecting portion through the solder.

2. The battery assembly according to claim 1, wherein: The first connecting portion is a protrusion, and the second connecting portion is a groove; Alternatively, the first connecting portion is a groove, and the second connecting portion is a protrusion.

3. The battery assembly according to claim 2, wherein: The protrusion is an annular protrusion, which is arranged around the center of the collecting disk. The groove is an annular groove, which is arranged around the center of the collecting disk. The annular protrusion is connected to the annular groove through the welding agent.

4. The battery assembly according to claim 1, wherein: The first connecting portion is a flattened portion, the second connecting portion is a groove, the welding agent is filled in the groove, and the flattened portion is connected to the second connecting portion through the welding agent.

5. The battery assembly according to claim 1, wherein: A thickened portion is provided on a side of the current collecting plate away from the electrode tab, and the thickened portion is arranged at a position corresponding to the second connecting portion.

6. The battery assembly according to claim 1, wherein: The collecting plate is provided with a weight-reducing hole, and the weight-reducing hole is spaced apart from the second connecting portion.

7. The battery assembly according to claim 6, characterized in that The second connecting portion is an annular connecting portion arranged around the center of the collecting disk. There are multiple weight-reducing holes, and the multiple weight-reducing holes are distributed at intervals along the side of the second connecting portion away from the center of the collecting disk, and the multiple weight-reducing holes are distributed at intervals along the outer periphery of the second connecting portion.

8. The battery assembly according to claim 7, characterized in that A first reinforcing rib is provided on a side of the current collecting disk away from the electrode tab. The first reinforcing rib extends from the edge of the current collecting disk to the center of the current collecting disk, and one end of the first reinforcing rib extends and is connected to the second connecting portion.

9. The battery assembly according to claim 8, characterized in that There are multiple first reinforcing ribs, and the multiple first reinforcing ribs are arranged at intervals.

10. The battery assembly according to claim 1, wherein: The current collecting disk includes a tab lead-out piece, the current collecting disk is provided with a bent edge, the tab lead-out piece is connected to the bent edge and bent to a side of the current collecting disk away from the tab.

11. The battery assembly according to claim 10, characterized in that The current collecting plate is provided with a second reinforcing rib connected to a side of the current collecting plate away from the tab, and the second reinforcing rib is arranged opposite to the tab lead-out piece to support the tab lead-out piece when it is bent.

12. The battery assembly according to claim 11, wherein: The second reinforcement rib is an arc-shaped reinforcement rib, and the arc-shaped reinforcement rib extends around the outer circumference of the second connecting portion.

13. The battery assembly according to any one of claims 1 to 12, characterized in that: The solder is a solder.

14. A battery structure, characterized in that: The battery structure comprises a shell, a battery cell, a terminal column, a cover plate and a battery assembly according to any one of claims 1 to 13; The battery cell is arranged in the shell, the tab of the battery assembly is connected to the end of the battery cell, the pole is connected to the tab lead-out piece of the current collecting disk of the battery assembly, and the cover is connected to the pole and the shell.

15. The battery structure according to claim 14, characterized in that: The battery structure includes a first spacer and a second spacer, wherein the first spacer is connected between the cover plate and the pole, and the second spacer is arranged in the shell and between the cover plate and the battery cell.

16. The battery structure according to claim 15, characterized in that: The battery structure includes a support member, which abuts against the second spacer and passes through the weight-reducing hole of the current collecting plate and abuts against the electrode tab.

17. A battery pack, characterized in that: The battery pack includes the battery structure according to any one of claims 14 to 16.

18. An electrical device, characterized in that: The electrical equipment includes the battery pack according to claim 17, or the battery structure according to any one of claims 14 to 16.

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