Tab, battery device and electric equipment

Abstract

The tab comprises a first connecting part and a second connecting part, the first connecting part comprises a first surface, a first surface and a second surface, the first surface is suitable for being connected with a current collector, the first surface and the second surface are oppositely arranged in a first direction, and the first surface and the second surface are both connected with the first surface; the second connecting part is connected with the first connecting part in a second direction, and the second direction intersects with the first direction; the second connecting part comprises a third face and a fourth face, the third face and the first face face the same direction, the fourth face and the second face face the same direction, and the average distance between the first face and the second face is smaller than the average distance between the third face and the fourth face. By arranging the first connecting part of which the size is smaller than that of the second connecting part in the first direction, the extrusion force of the tab on the current collector can be reduced, and the fracture risk of the current collector is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole ear, a battery device and electrical equipment. Background Art

[0002] In existing battery devices, the tabs are welded to the surface of the current collector, and the sides of the tabs are in close contact with the current collector. When used in scenarios with larger currents, the tabs are larger in size, and after the battery is charged and discharged, the pole pieces expand. At this time, there is a cutting force between the edge of the tab and the current collector, especially in cylindrical batteries or wound button batteries, where the cutting force is greater and the current collector is at risk of breaking. Utility Model Content

[0003] The utility model aims to provide a pole ear, a battery device and an electrical equipment, so as to solve the problem that the pole ear may cause the current collector to break.

[0004] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0005] In the first aspect, the utility model provides a pole ear, including a first connecting portion and a second connecting portion, the first connecting portion including a first surface, a first face and a second face, the first surface is suitable for connecting to a current collector, the first face and the second face are arranged opposite to each other in a first direction, and the first face and the second face are both connected to the first surface; the second connecting portion is connected to the first connecting portion in a second direction, and the second direction intersects with the first direction; the second connecting portion includes a third face and a fourth face, the third face is oriented in the same direction as the first face, the fourth face is oriented in the same direction as the second face, and the average distance between the first face and the second face is smaller than the average distance between the third face and the fourth face.

[0006] In one embodiment, the orthographic projection of the first connecting portion in the second direction is located within the orthographic projection of the second connecting portion in the second direction.

[0007] In one embodiment, the first surface is directly connected to the third surface; or, the tab further includes a first connecting surface, and the first connecting surface connects the first surface and the third surface.

[0008] In one embodiment, in the second direction, from an end of the first connection portion close to the second connection portion to an end of the first connection portion far from the second connection portion, a distance from the first surface to the second surface tends to decrease.

[0009] In one embodiment, the first connecting portion also includes a second surface opposite to the first surface in a third direction, and the third direction intersects with the first direction; the second connecting portion also includes a third surface and a fourth surface, the third surface and the first surface are oriented in the same direction, the fourth surface and the second surface are oriented in the same direction, and the average distance from the first surface to the second surface is smaller than the average distance from the third surface to the fourth surface.

[0010] In one embodiment, the first surface is directly connected to the third surface; or, the tab further includes a second connecting surface, and the second connecting surface connects the first surface and the third surface.

[0011] In one embodiment, a size of the first surface in the second direction is greater than a size of the third surface in the second direction.

[0012] In one embodiment, the first connecting portion further includes a third connecting surface, and the third connecting surface connects the first surface and the first surface.

[0013] In a second aspect, the utility model further provides a battery device, comprising a battery cell and a tab as described in any one of the various embodiments of the first aspect, wherein the tab is suitable for connecting to a current collector of the battery cell.

[0014] In a third aspect, the utility model further provides an electrical equipment, comprising an electrical device and a battery device as described in the second aspect, wherein the battery device supplies power to the electrical device.

[0015] By setting the pole ear to include a first connecting part and a second connecting part, the first connecting part is suitable for connecting with the current collector, the first connecting part includes a first surface and a second surface arranged opposite to each other in a first direction, the second connecting part includes a third surface facing the same direction as the first surface and a fourth surface facing the same direction as the second surface, the average distance between the first surface and the second surface is smaller than the average distance between the third surface and the fourth surface, and the size of the first connecting part in the first direction is smaller, which can reduce the squeezing force of the pole ear on the current collector and reduce the risk of breakage of the current collector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a front view of a tab of an embodiment;

[0018] Figure 2 is a front view of a pole ear of another embodiment;

[0019] Figure 3 is a side view of a tab of an embodiment;

[0020] Figure 4 is a side view of a tab of another embodiment;

[0021] Figure 5 is a top view of a first connecting portion of an embodiment;

[0022] Figure 6 is a top view of a first connecting portion of another embodiment;

[0023] Figure 7 It is a front view of a pole ear of another embodiment.

[0024] Description of reference numerals:

[0025] 100-ear;

[0026] 10-first connecting portion, 11-first surface, 12-first face, 13-second face, 14-second surface, 15-third connecting face;

[0027] 20-second connecting portion, 21-third surface, 22-third surface, 23-fourth surface, 24-fourth surface;

[0028] 30- first connecting surface;

[0029] 40- second connecting surface;

[0030] 50-guide needle;

[0031] 60-Base. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in this utility model have the same meaning as those commonly understood by technicians in the technical field of this utility model. The terms used in the specification of this utility model are only for the purpose of describing specific embodiments and are not intended to limit this utility model. The term "and / or" used in this utility model includes any and all combinations of one or more related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] An embodiment of the utility model provides an electric device, including an electric device and a battery device in the embodiment of the utility model, and the battery device supplies power to the electric device.

[0037] Optionally, the electrical device may be an electric vehicle, a hybrid vehicle, a base station, a household electrical load, etc.

[0038] Optionally, the battery device may be a power battery device, an energy storage battery device, etc., without specific limitation.

[0039] The electrical equipment adopts the battery device in the embodiment of the utility model, and the battery device has a long service life and low safety risk.

[0040] The embodiment of the utility model further provides a battery device, comprising a battery cell and a tab in the embodiment of the utility model, wherein the tab is connected to a current collector of the battery cell.

[0041] Optionally, the battery cell can be a square laminated battery cell, a wound battery cell, etc., without limitation.

[0042] Optionally, the battery cell includes a positive electrode sheet, a negative electrode sheet and a separator, and the positive electrode sheet, the separator and the negative electrode sheet are stacked in sequence. The positive electrode sheet includes a positive electrode collector, and the negative electrode sheet includes a negative electrode collector. The tab in the embodiment of the utility model can be connected to the positive electrode collector as a positive electrode tab, and can also be connected to the negative electrode collector as a negative electrode tab, without specific limitation.

[0043] Optionally, the positive electrode tab and the negative electrode tab may be disposed at one end of the battery cell in the length direction, or may be disposed at two opposite or adjacent ends of the battery cell, without specific limitation.

[0044] Optionally, the connection method between the electrode tab and the current collector can be welding, bonding, clamping, screwing, etc., without specific limitation.

[0045] Optionally, the battery device further comprises a shell, the shell comprising a bottom plate and a plurality of side plates, the side plates are connected to the bottom plate and enclosed to form a receiving cavity. The receiving cavity is open at one end opposite to the bottom plate, and the battery cell is received in the receiving cavity.

[0046] Optionally, the shell is a material with high structural strength, specifically metal materials, high-strength plastics, ceramics, etc., and metal materials such as aluminum, aluminum alloys, magnesium alloys, iron and iron alloys, etc. The shell can be an integrated structure, that is, the bottom plate and the side plates are an integrated structure made by an integrated molding process, and the integrated molding process can be specifically stamping, casting, etc., without limitation. The shell can also be a split structure, and the side plates and the bottom plate can be connected and fixed by welding, bonding, clamping, screwing, etc. The wall thickness of the shell can be roughly uniform everywhere, that is, the thickness of the side plates can be roughly uniform, and the thickness of the bottom plate and the side plates can also be roughly the same.

[0047] Optionally, the battery device further comprises a cover plate, which is connected to the opening of the shell to close the accommodating cavity. The connection between the cover plate and the shell can be welding, bonding, clamping, screwing, etc., without limitation. The shape of the cover plate can be substantially the same as that of the bottom plate.

[0048] The battery device in the embodiment of the utility model can reduce the risk of the current collector in the battery device being broken by adopting the pole ear in the embodiment of the utility model, thereby improving the safety of the battery.

[0049] The pole ear in the embodiment of the utility model is described in detail below.

[0050] Please refer to Figure 1 An embodiment of the utility model provides a tab 100 including a first connecting portion 10 and a second connecting portion 20 .

[0051] First define the direction. Figure 1 As shown, X is the first direction, Y is the second direction, and Z is the third direction.

[0052] Optionally, the first connecting portion 10 includes a first surface 11 , a first face 12 and a second face 13 , the first surface 11 is suitable for connecting to the current collector, the first face 12 and the second face 13 are arranged opposite to each other in the first direction X, and the first face 12 and the second face 13 are both connected to the first surface 11 .

[0053] Optionally, the first direction X is the width direction of the tab 100 .

[0054] Optionally, the first surface 11 and the current collector may be connected by welding, bonding, clamping, screwing, etc., without specific limitation.

[0055] Optionally, the first surface 12 and the first surface 11 as well as the second surface 13 and the first surface 11 may be connected directly or indirectly, and there is no specific limitation thereto.

[0056] Optionally, the first surface 12 and the second surface 13 may be planes, curved surfaces, folded surfaces, etc. The first surface 12 and the second surface 13 may be parallel, or there may be an angle between the first surface 12 and the second surface 13, and the above methods are all possible and are not specifically limited.

[0057] Optionally, the second connection portion 20 is connected to the first connection portion 10 in a second direction Y, and the second direction Y intersects the first direction X. The second connection portion 20 includes a third surface 22 and a fourth surface 23 , the third surface 22 and the first surface 12 face the same direction, and the fourth surface 23 and the second surface 13 face the same direction.

[0058] Optionally, the second direction Y is perpendicular to the first direction X. The second direction Y is the length direction of the tab 100 .

[0059] Optionally, the third surface 22 and the fourth surface 23 are arranged opposite to each other in the first direction X, and the shapes and positional relationship between the third surface 22 and the fourth surface 23 are similar to the shapes and positional relationship between the aforementioned first surface 12 and the second surface 13, which can be used for reference and will not be repeated.

[0060] Optionally, the tab 100 may be an integrated structure, that is, the first connection portion 10 and the second connection portion 20 are an integrated structure made by an integrated molding process, and the integrated molding process may be stamping, casting, etc., without limitation. The tab 100 may also be a split structure, and the first connection portion 10 and the second connection portion 20 may be connected and fixed by welding, bonding, clamping, screwing, etc.

[0061] Optionally, the material of the tab 100 can be aluminum, nickel, copper-plated nickel, etc., without specific limitation.

[0062] Optionally, an average distance between the first surface 12 and the second surface 13 is smaller than an average distance between the third surface 22 and the fourth surface 23 .

[0063] Optionally, L1 is defined as the average distance between the first surface 12 and the second surface 13, and L2 is defined as the average distance between the third surface 22 and the fourth surface 23, satisfying: L1<L2.

[0064] Among them, L1=(L1max+L1min) / 2, L2=(L2max+L2min) / 2, L1max is the maximum distance from the first surface 12 to the second surface 13, L1min is the minimum distance from the first surface 12 to the second surface 13, L2max is the maximum distance from the third surface 22 to the fourth surface 23, L2min is the minimum distance from the third surface 22 to the fourth surface 23.

[0065] Optionally, in one embodiment, as Figure 1As shown, the first surface 12 is parallel to the second surface 13 , the third surface 22 is parallel to the fourth surface 23 , and the distance between the first surface 12 and the second surface 13 is smaller than the distance between the third surface 22 and the fourth surface 23 .

[0066] Optionally, in another embodiment, there is an angle between the first surface 12 and the second surface 13, the third surface 22 is parallel to the fourth surface 23, and the distance from the third surface 22 to the fourth surface 23 is L2, and L1<L2 is satisfied, and there is no specific limitation.

[0067] In existing battery devices, the tab 100 is connected to the surface of the current collector, and the edge of the tab 100 is relatively sharp. After winding, the side of the tab 100 is in close contact with the current collector. After the battery device is charged and discharged, the pole piece expands. At this time, there is a cutting force between the edge of the tab 100 and the current collector. Especially in cylindrical batteries or wound button batteries, the cutting force is greater, and there is a risk of the current collector breaking.

[0068] In addition, in the case of a larger current application scenario, the width or thickness of the tab 100 needs to be increased to increase the current carrying capacity of the battery device; however, after increasing the width or thickness of the tab 100, the tab 100 squeezes the foil more severely, which is more likely to cause the current collector to rupture. If the shape of the tab 100 is not changed, in order to meet the large current carrying capacity, it is necessary to replace the metal with better conductivity, such as copper and silver, which is costly and not conducive to widespread application.

[0069] The pole ear 100 in the embodiment of the utility model is provided with a first connecting portion 10 and a second connecting portion 20. The average distance between the first surface 12 and the second surface 13 of the first connecting portion 10 is smaller than the average distance between the third surface 22 and the fourth surface 23 of the second connecting portion 20. The size of the first connecting portion 10 in the first direction X is relatively small as a whole, which can reduce the squeezing force of the pole ear 100 on the current collector and reduce the risk of breakage of the current collector.

[0070] Optionally, the orthographic projection of the first connecting portion 10 in the second direction Y is located within the orthographic projection of the second connecting portion 20 in the second direction Y.

[0071] Optionally, in the orthographic projection in the second direction Y, the edge of the first connecting portion 10 may be entirely located inside the edge of the second connecting portion 20; or, a portion of the edge of the first connecting portion 10 may overlap with the edge of the second connecting portion 20, without specific limitation.

[0072] By arranging that the orthographic projection of the first connection part 10 in the second direction Y is located within the orthographic projection of the second connection part 20 in the second direction Y, the connection stability between the first connection part 10 and the second connection part 20 is ensured.

[0073] Optionally, in one embodiment, as Figure 2As shown, the first surface 12 is directly connected to the third surface 22, and the second surface 13 is directly connected to the fourth surface 23, which has a simple structure and is easy to process.

[0074] Optionally, in another embodiment, as Figure 1 As shown, the tab 100 further includes a first connecting surface 30 , and the first connecting surface 30 connects the first surface 12 and the third surface 22 .

[0075] Optionally, the first connecting surface 30 may be any one of a plane, a curved surface, and a folded surface, or a combination of multiple surfaces. Figure 1 As shown, the first connecting surface 30 is a concave curved surface; alternatively, the first connecting surface 30 is a plane, and the first connecting surface 30 may be parallel to the first direction X, or may have an angle with the first direction X, and there is no specific limitation.

[0076] Similarly, the second surface 13 and the fourth surface 23 are connected via another corresponding first connecting surface 30 , without any specific limitation.

[0077] By setting the pole tab 100 to also include a first connecting surface 30, the first connecting surface 30 connects the first surface 12 and the third surface 22, so that a smooth transition is made between the first connecting portion 10 and the second connecting portion 20, and it can also be avoided that the connection between the first connecting portion 10 and the second connecting portion 20 is too sharp, causing the pole tab 100 to cut the surface of the collector during the winding process.

[0078] Optionally, in the second direction Y, from an end of the first connection portion 10 close to the second connection portion 20 to an end of the first connection portion 10 far from the second connection portion 20 , the distance from the first surface 12 to the second surface 13 tends to decrease.

[0079] Optionally, the distance from the first surface 12 to the second surface 13 may be decreased suddenly or may be decreased gradually continuously, and there is no specific limitation thereto.

[0080] For example, Figure 2 As shown, the orthographic projection of the first connecting portion 10 in the third direction Z is an isosceles trapezoidal shape, the angle between the first surface 12 and the second direction Y is the same as the angle between the second surface 13 and the second direction Y, and at the edge of the first connecting portion 10 away from the second connecting portion 20, the distance from the first surface 12 to the second surface 13 is the shortest.

[0081] By being arranged in the second direction Y, the distance from the first surface 12 to the second surface 13 decreases from the end of the first connecting portion 10 close to the second connecting portion 20 to the end of the first connecting portion 10 away from the second connecting portion 20. While reducing the squeezing of the pole tab 100 on the current collector, the current carrying capacity of the pole tab 100 is not affected, and the demand for large current carrying of the pole tab 100 can be met.

[0082] Optionally, the first connecting portion 10 further includes a second surface 14 opposite to the first surface 11 in a third direction Z, and the third direction Z intersects with the first direction X.

[0083] Optionally, the third direction Z is perpendicular to both the first direction X and the second direction Y. The third direction Z is the thickness direction of the tab 100 .

[0084] Optionally, the second connecting portion 20 further includes a third surface 21 and a fourth surface 24 , the third surface 21 faces the same direction as the first surface 11 , the fourth surface 24 faces the same direction as the second surface 14 , and the third surface 21 and the fourth surface 24 are disposed opposite to each other in the third direction Z.

[0085] Optionally, an average distance between the first surface 11 and the second surface 14 is smaller than an average distance between the third surface 21 and the fourth surface 24 .

[0086] Optionally, L3 is defined as the average distance between the first surface 11 and the second surface 14, and L4 is defined as the average distance between the third surface 21 and the fourth surface 24, satisfying: L3<L4;

[0087] Among them, L3=(L3max+L3min) / 2, L4=(L4max+L4min) / 2, L3max ​​is the maximum distance from the first surface 11 to the second surface 14, L3min is the minimum distance from the first surface 11 to the second surface 14, L4max is the maximum distance from the third surface 21 to the fourth surface 24, L4min is the minimum distance from the third surface 21 to the fourth surface 24.

[0088] Optionally, in one embodiment, as Figure 3 As shown, the first surface 11 is parallel to the second surface 14 , the third surface 21 is parallel to the fourth surface 24 , and the distance between the first surface 11 and the second surface 14 is smaller than the distance between the third surface 21 and the fourth surface 24 .

[0089] Optionally, in another embodiment, the first surface 11 is parallel to the second surface 14, an angle is formed between the third surface 21 and the fourth surface 24, and the distance between the first surface 11 and the second surface 14 is L3, and L3<L4 is satisfied, without specific limitation.

[0090] By setting the second connecting portion 20 to also include a third surface 21 and a fourth surface 24, the third surface 21 is oriented in the same direction as the first surface 11, and the fourth surface 24 is oriented in the same direction as the second surface 14, and the average distance from the first surface 11 to the second surface 14 is smaller than the average distance from the third surface 21 to the fourth surface 24, the squeezing force of the pole ear 100 on the current collector can be reduced, the risk of the current collector being broken can be reduced, and at the same time, the large current flow requirements of the pole ear 100 can be met.

[0091] Optionally, the first surface 11 is directly connected to the third surface 21 ; or, the tab 100 further includes a second connecting surface 40 , and the second connecting surface 40 connects the first surface 11 and the third surface 21 .

[0092] Optionally, in one embodiment, as Figure 4 As shown, the first surface 11 is directly connected to the third surface 21, and the second surface 14 is directly connected to the fourth surface 24, which has a simple structure and is easy to process.

[0093] Optionally, in another embodiment, as Figure 3 As shown, the tab 100 further includes a second connecting surface 40 , and the second connecting surface 40 connects the first surface 11 and the third surface 21 .

[0094] Optionally, the second connecting surface 40 may be any one of a plane, a curved surface, and a folded surface, or a combination of multiple surfaces. For example, the second connecting surface 40 is a concave curved surface; or, the second connecting surface 40 is a plane, and the first connecting surface 30 may be parallel to the first direction X, such as Figure 4 As shown, it may also have an angle with the first direction X, and there is no specific limitation.

[0095] Similarly, the second surface 14 and the fourth surface 24 are connected via another corresponding second connecting surface 40 , which is not specifically limited.

[0096] By directly connecting the first surface 11 and the third surface 21 to simplify the process, or connecting the first surface 11 and the third surface 21 via the second connecting surface 40, it is possible to avoid the connection between the first connecting portion 10 and the second connecting portion 20 being too sharp, causing the tab 100 to cut the surface of the current collector during the winding process.

[0097] Optionally, the size of the first surface 11 in the second direction Y is greater than the size of the third surface 21 in the second direction Y. The size of the first surface 11 in the second direction Y is the length of the first connecting portion 10 in the second direction Y. The longer length of the first connecting portion 10 in the second direction Y can make the connection between the first surface 11 and the current collector more stable and reduce the squeezing force of the tab 100 on the current collector.

[0098] Optionally, the first connecting portion 10 further includes a third connecting surface 15 , and the third connecting surface 15 connects the first surface 11 and the first surface 12 .

[0099] Optionally, the second connecting surface 40 may be any one of a plane, a curved surface, and a folded surface, or a combination of multiple thereof, without specific limitation.

[0100] Optionally, any one or more combinations of the first surface 11 and the second surface 13 , the first surface 12 and the second surface 14 , and the second surface 13 and the second surface 14 may also be connected via the corresponding third connecting surface 15 , without specific limitation.

[0101] Exemplarily, in one embodiment, Figure 5 As shown, the third connecting surface 15 is a plane, the first surface 11 and the first surface 12 are connected via one third connecting surface 15, and the first surface 11 and the second surface 13 are connected via another third connecting surface 15. The first surface 12 and the second surface 14, and the second surface 13 and the second surface 14 are directly connected.

[0102] In another embodiment, Figure 6 As shown, the third connecting surface 15 is a concave curved surface, and the first surface 11 and the first surface 12, the first surface 11 and the second surface 13, the first surface 12 and the second surface 14, and the second surface 13 and the second surface 14 are respectively connected through the third connecting surface 15.

[0103] By setting the first connecting part 10 to also include a third connecting surface 15, the third connecting surface 15 connects the first surface 11 and the first surface 12, so that the middle thickness of the first connecting part 10 is greater than the edge thickness. When the first connecting part 10 is connected to the current collector, the edge of the first connecting part 10 does not contact the current collector, or only slightly contacts the current collector, which helps to reduce the squeezing effect of the edge of the pole ear 100 on the current collector, and can alleviate the phenomenon of pole piece breakage during the cycle process.

[0104] Optionally, the tab 100 further includes a connecting terminal, which is connected to a section of the second connecting portion 20 in the second direction Y away from the first connecting portion 10 .

[0105] Optionally, the connection terminal and the second connection portion 20 may be connected and fixed by welding, bonding, clamping, screwing, etc., without limitation.

[0106] Optional, such as Figure 7 As shown, the connection terminal includes a guide pin 50 and a base 60 , the base 60 is connected to one end of the second connection part 20 away from the first connection part 10 and extends out of the end of the collector, and the guide pin 50 is connected to one end of the base 60 away from the second connection part 20 .

[0107] Optionally, the material of the guide needle 50 can be a metal with high hardness such as stainless steel, copper, etc., and there is no specific limitation.

[0108] Optionally, the shapes of the guide needle 50 and the base 60 may be cylinders, prisms, etc., without specific limitation.

[0109] For example, Figure 7As shown, the guide needle 50 and the base 60 are cylindrical in shape, and the diameter of the base 60 is greater than the diameter of the guide needle 50 .

[0110] Optionally, the guide pin 50 and the base 60 may be connected and fixed by welding, bonding, clamping, screwing, etc., without limitation.

[0111] By configuring the tab 100 to further include a connecting terminal, the connecting terminal is connected to the second connecting portion 20 to complete the electrical connection between the tab 100 and the outside.

[0112] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0113] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A tab, characterized in that: include: A first connecting portion, comprising a first surface, a first face and a second face, wherein the first surface is suitable for connecting with a current collector, the first face and the second face are arranged opposite to each other in a first direction, and the first face and the second face are both connected to the first surface; A second connecting portion is connected to the first connecting portion in a second direction, and the second direction intersects with the first direction; the second connecting portion includes a third surface and a fourth surface, the third surface is oriented in the same direction as the first surface, the fourth surface is oriented in the same direction as the second surface, and the average distance between the first surface and the second surface is smaller than the average distance between the third surface and the fourth surface.

2. The tab according to claim 1, characterized in that: An orthographic projection of the first connection portion in the second direction is located within an orthographic projection of the second connection portion in the second direction.

3. The tab according to claim 1, characterized in that: The first surface is directly connected to the third surface; or, the tab further includes a first connecting surface, and the first connecting surface connects the first surface and the third surface.

4. The tab according to claim 3, characterized in that: In the second direction, from an end of the first connection portion close to the second connection portion to an end of the first connection portion far from the second connection portion, the distance from the first surface to the second surface tends to decrease.

5. The tab according to claim 1, characterized in that: The first connecting portion also includes a second surface opposite to the first surface in a third direction, and the third direction intersects with the first direction; the second connecting portion also includes a third surface and a fourth surface, the third surface and the first surface are oriented in the same direction, the fourth surface and the second surface are oriented in the same direction, and the average distance from the first surface to the second surface is smaller than the average distance from the third surface to the fourth surface.

6. The tab according to claim 5, characterized in that: The first surface is directly connected to the third surface; or, the tab further includes a second connecting surface, and the second connecting surface connects the first surface and the third surface.

7. The tab according to claim 6, characterized in that: A size of the first surface in the second direction is greater than a size of the third surface in the second direction.

8. The tab according to claim 1, characterized in that: The first connection portion further includes a third connection surface, and the third connection surface connects the first surface and the first surface.

9. A battery device, characterized in that: The invention comprises a battery cell and a pole tab as claimed in any one of claims 1 to 8, wherein the pole tab is suitable for being connected to a current collector of the battery cell.

10. An electrical device, characterized in that: It comprises an electric device and the battery device as claimed in claim 9, wherein the battery device supplies power to the electric device.

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