Connecting piece and battery
By setting multiple concave and convex structures on the surface of the electrode connection part, the light absorption rate of the welding area is enhanced, which solves the problem of unreliable welding between the lithium battery connector and the electrode, and achieves a more stable connection.
Patent Information
- Application Number
- CN202422463060.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-10-11
AI Technical Summary
The existing lithium battery connector and the pole are not welded firmly and are easy to fall off.
A connecting piece is designed with multiple recesses and protrusions on the surface of the electrode connection part. The recesses and protrusions have different sizes and shapes, which increases the surface refractive index and absorptivity of the welding area, improves the laser absorptivity, and enables the electrode connection part in the welding area to melt and connect quickly.
It improves the connection strength between the electrode post and the electrode post, reduces the welding difficulty and the probability of detachment, and extends the service life of the connecting piece.
Smart Images
Figure CN223451139U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a battery technical field, concretely relates to a connecting piece and battery. BACKGROUND
[0002] In the related art, the secondary battery adopts a metal connecting piece to realize the conduction of the current of a bare cell from the inside to the outside of the bare cell. In general, one side of the metal connecting piece is connected with a core package tab, and the other side is connected with a top cover assembly. The connecting piece and the top cover assembly are often connected by laser welding process, and the connection mode mainly adopts laser penetration welding to weld the connecting piece to the surface of the pole. However, the materials of the connecting piece and the pole are different, and due to the different materials, the reflectivity and absorption rate of laser are different in the laser welding process, which causes the materials to be unable to be quickly melted, and high reflection is easily formed, resulting in unstable connection of the connecting piece and the pole and the risk of falling off. SUMMARY
[0003] Embodiments of the utility model provide a connecting piece and battery, and aim to solve the technical problem of unstable welding of the connecting piece and the pole of the existing lithium battery.
[0004] In a first aspect, embodiments of the utility model provide a connecting piece for connecting a pole and a tab of a battery, comprising:
[0005] a tab connecting part; and
[0006] a pole connecting part connected to one side of the tab connecting part, the pole connecting part being provided with a welding area, the welding area being used to contact with welding laser, the surface of the pole connecting part of the welding area being provided with a plurality of recesses and a plurality of protrusions, the vertical distance from the bottom of the recess to the surface of the pole connecting part being H1, 0 < H1 ≤ 0.1 mm, and the vertical distance from the top end of the protrusion to the surface of the pole connecting part being H2, 0 < H2 ≤ 0.1 mm.
[0007] In an embodiment, along the thickness direction of the tab connecting part, the plurality of protrusions include a first protrusion, the height of the first protrusion being higher than the height of the other protrusions, the plurality of recesses include a first recess, the groove depth of the first recess being greater than the groove depth of the other recesses, and the included angle between the virtual connection line between the groove bottom of the first recess and the top of the first protrusion and the horizontal plane being θ, 0° < θ ≤ 20°.
[0008] In an embodiment, the sizes of the plurality of recesses are different, and the sizes of the plurality of protrusions are different.
[0009] In an embodiment, heights of the plurality of protrusions are arranged in a decreasing manner, and depths of the plurality of recesses are arranged in a decreasing manner in a direction pointing from the lug connecting portion to the pole connecting portion.
[0010] In an embodiment, shapes of the plurality of recesses are different, and shapes of the plurality of protrusions are different.
[0011] In an embodiment, the shape of the recess includes at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon; and / or,
[0012] The shape of the protrusion includes at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon.
[0013] In an embodiment, the thickness of the lug connecting portion is H3, and 0.5mm<H3<1.5mm.
[0014] In an embodiment, the pole connecting portion is further provided with a non-welding area, and the non-welding area is arranged around the welding area.
[0015] In an embodiment, the welding area includes an annular welding area, a surface area of the annular welding area is S1, and a surface area of the non-welding area is S2, wherein (21.75π)mm 2 ≤S1≤(S1+S2); or,
[0016] The welding area includes at least one rectangular welding area, a surface area of the rectangular welding area is S3, and a surface area of the non-welding area is S2, wherein 24mm 2 ≤S3≤(S3+S2).
[0017] In a second aspect, embodiments of the utility model provide a battery, which comprises the connecting sheet. The connecting sheet comprises:
[0018] A lug connecting portion; and,
[0019] A pole connecting portion connected to one side of the lug connecting portion, the pole connecting portion is provided with a welding area, the welding area is used to contact with a welding laser, a surface of the pole connecting portion of the welding area is provided with a plurality of recesses and a plurality of protrusions, a vertical distance from the bottom of the recess to the surface of the pole connecting portion is H1, and 0<H1≤0.1mm, a vertical distance from the top of the protrusion to the surface of the pole connecting portion is H2, and 0<H2≤0.1mm.
[0020] The embodiment of the utility model has the beneficial effects that:
[0021] In the technical scheme of the utility model, the tab connecting part is used to connect with the tab, the pole connecting part is provided with a welding area, the welding area is used to connect with the pole, the welding mode is adopted to connect, and the connecting strength of the pole connecting part and the pole can be improved. Meanwhile, the surface of the pole connecting part in the welding area is provided with a plurality of recesses and a plurality of convex parts, the plurality of convex parts and the plurality of recesses can increase the surface refractive index of the welding area, improve the absorption rate of the welding area to laser, make the pole connecting part in the welding area be able to be quickly melted and connected, thereby improving the processability of the pole connecting part and the pole, reducing the welding difficulty of the pole connecting part and the pole, further improving the connecting strength of the pole connecting part and the pole, and reducing the probability of the pole connecting part and the pole falling off. The depth of the recess is 0-0.1mm, the height of the convex part is 0-0.1mm, within the above size range, the surface roughness of the welding area can be increased, and meanwhile the connecting strength of the pole connecting part can be ensured. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.
[0023] Figure 1 It is the structure schematic view of one embodiment of the connecting piece provided by the utility model,
[0024] Figure 2 It is Figure 1 the enlarged view of A in
[0025] Figure 3 It is Figure 1 the front view of
[0026] Figure 4 It is Figure 3 the enlarged view of B in
[0027] Figure 5 It is the structure schematic view of another embodiment of the connecting piece provided by the utility model,
[0028] Figure 6 It is the structure schematic view of still another embodiment of the connecting piece provided by the utility model,
[0029] Figure 7 It is the structure schematic view of still another embodiment of the connecting piece provided by the utility model.
[0030] EXPLANATION OF DRAWINGS
[0031]
[0032] DETAILED DESCRIPTION
[0033] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model. In addition, it should be understood that the specific embodiments described herein are only used for illustrating and explaining the utility model, and are not used for limiting the utility model. In the utility model, the orientation words such as 'upper' and 'lower' generally refer to the upper and lower of the device in the actual use or working state, and the specific is the drawing direction in the drawings. And 'inner' and 'outer' refer to the outline of the device.
[0034] In the related art, the secondary battery adopts a metal connecting piece to realize the conduction of the current of the bare battery cell from the inside to the outside of the bare battery cell. Usually, one side of the metal connecting piece is connected with the core bag tab, and the other side is connected with the top cover assembly. The connecting piece and the top cover assembly are often connected by laser welding process, and the connection mode mainly adopts laser penetration welding to weld the connecting piece to the surface of the pole. However, the materials of the connecting piece and the pole are different, and due to the different materials, the reflectivity and absorption rate of laser are different in the laser welding process, which causes the material to be unable to be quickly melted, and high reflection is easily formed, which causes the connecting piece and the pole to be unstable in connection, and the risk of falling off is easily caused.
[0035] Therefore, the utility model provides a connecting piece 100, Figures 1 to 7 The connecting piece 100 provided by the utility model has a large refractive index to laser, can absorb a large amount of energy generated by laser, reduces the welding difficulty with the pole, increases the connection strength, and reduces the risk of falling off. The connecting piece 100 will be described in detail below in combination with the main drawings.
[0036] Please refer to Figure 1 and Figure 2The connecting sheet 100 is used for connecting the pole and the tab of the battery, and comprises a tab connecting part 1 and a pole connecting part 2 connected to one side of the tab connecting part 1, wherein the pole connecting part 2 is provided with a welding area 10 used for contacting with a welding laser, and the surface of the pole connecting part 2 of the welding area 10 is provided with a plurality of recesses 211 and a plurality of convex parts 212, wherein the vertical distance from the bottom of the recess 211 to the surface of the pole connecting part is H1, and 0 < H1 < 0.1 mm, and the vertical distance from the top end of the convex part 212 to the surface of the pole connecting part is H2, and 0 < H2 < 0.1 mm.
[0037] In the technical scheme of the utility model, the tab connecting part 1 is used for connecting with the tab, the pole connecting part 2 is provided with the welding area 10 used for connecting with the pole, and the welding mode is adopted to connect, so that the connecting strength of the pole connecting part 2 and the pole can be improved. Meanwhile, the surface of the pole connecting part 2 in the welding area 10 is provided with a plurality of recesses 211 and a plurality of convex parts 212, the plurality of convex parts 212 and the plurality of recesses 211 can increase the surface refractive index of the welding area 10, improve the absorption rate of the welding area 10 to the laser, so that the pole connecting part 2 in the welding area 10 can be quickly melted and connected, thereby improving the processability of the pole connecting part 2 and the pole, reducing the welding difficulty of the pole connecting part 2 and the pole, further improving the connecting strength of the pole connecting part 2 and the pole, and reducing the probability of the pole connecting part 2 and the pole falling off. The depth of the recess 211 is 0-0.1 mm, and the height of the convex part 212 is 0-0.1 mm, within the above size range, the surface roughness of the welding area 10 can be increased, and the connecting strength of the pole connecting part 2 can be ensured at the same time.
[0038] It should be noted that when the depth of the recess 211 is greater than 0.1 mm, the deformation amount of the pole connecting part 2 is too large, which causes the overall deformation of the connecting sheet 100 to be serious, and the service life of the connecting sheet 100 is reduced. Specifically, the depth of the recess 211 can be 0.01 mm, 0.012 mm, 0.015 mm, 0.018 mm, 0.02 mm, 0.022 mm, 0.025 mm, 0.028 mm, 0.029 mm, 0.03 mm, 0.031 mm, 0.035 mm, 0.036 mm, 0.039 mm, 0.04 mm, 0.041 mm, 0.042 mm, 0.043 mm, 0.045 mm, 0.048 mm, 0.049 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm or other data not listed.
[0039] Similarly, when the height of the convex part 212 is greater than 0.1 mm, the deformation amount of the pole post connecting part 2 is too large, which leads to serious deformation of the connecting sheet 100 as a whole, and reduces the service life of the connecting sheet 100. Specifically, the height of the convex part 212 can be 0.01 mm, 0.012 mm, 0.015 mm, 0.018 mm, 0.02 mm, 0.022 mm, 0.025 mm, 0.028 mm, 0.029 mm, 0.03 mm, 0.031 mm, 0.035 mm, 0.036 mm, 0.039 mm, 0.04 mm, 0.041 mm, 0.042 mm, 0.043 mm, 0.045 mm, 0.048 mm, 0.049 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, or other data not listed.
[0040] Specifically, in the present embodiment, the material of the connecting sheet 100 is aluminum, and the material of the pole post is copper. Since the surfaces of copper and aluminum are too smooth, in the welding process, the surface is prone to large laser refraction, and the absorption rate is too low, which cannot make the material melt quickly, form high reflection, and lead to the risk of falling of the pole post connecting part 2 and the pole post. A plurality of convex parts 212 and a plurality of concave parts 211 are arranged in the welding area 10, which can improve the absorption rate of the welding area 10 to laser in the welding process, so that the welding area 10 and the pole post can be quickly melted, the processability of the pole post connecting part 2 can be improved, the welding difficulty of the pole post connecting part 2 and the pole post can be reduced, and the connection strength of the pole post connecting part 2 and the pole post can be improved.
[0041] It should be noted that, in order to ensure the connection strength, the tab connecting part 1 is welded to the tab, and the pole post connecting part 2 is welded to the pole post. The tab connecting part 1 includes a main body part and two connecting sub-parts, one side of the main body part is connected to the pole post connecting part 2, the other side of the main body part is connected to the two connecting sub-parts, and the two connecting sub-parts are arranged at intervals.
[0042] It should be noted that the forming process of the rough surface is not limited, and can be selected according to the actual situation. In the present embodiment, a plurality of convex parts 212 and a plurality of concave parts 211 are formed on the surface of the pole post connecting part 2 in the welding area 10 by stamping process.
[0043] Please refer to Figure 3 and Figure 4The plurality of protrusions 212 includes a first protrusion 212 having a height higher than those of the other protrusions 212, and the plurality of recesses 211 includes a first recess 211 having a groove depth greater than those of the other recesses 211. A virtual line connecting the bottom of the first recess 211 and the top of the first protrusion 212 forms an angle θ with the horizontal plane, where 0° < θ ≤ 20°. This arrangement causes the welding area 10 of the tab connecting portion 2 to have a certain inclination angle, which can form a reflection angle with the incident angle of the welding laser, thereby increasing the surface refractive index of the welding area 10, improving the absorption rate of the welding area 10 to the laser, and enabling the tab connecting portion 2 in the welding area 10 to be quickly melted and connected, thereby improving the processability of the tab connecting portion 2 and the tab, reducing the welding difficulty of the tab connecting portion 2 and the tab, further improving the connection strength of the tab connecting portion 2 and the tab, and reducing the probability of the tab connecting portion 2 and the tab falling off.
[0044] Specifically, θ can be 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, or other unlisted data.
[0045] In some embodiments, the plurality of recesses 211 have different sizes, and the plurality of protrusions 212 have different sizes. More specifically, each recess 211 has a different depth, and each protrusion 212 has a different height. In other embodiments, the recesses 211 have a first size L1 (the first size is the distance between two parallel planes virtually abutting the groove walls of the recess 211, where virtually abutting means that, when measuring the size of the recess 211, the two ends of the size line coincide with the straight line on which the groove walls of the recess 211 are located), and the protrusions 212 have a second size L2 (the second size is the distance between two parallel planes virtually abutting the side walls of the protrusion 212, where virtually abutting means that, when measuring the size of the protrusion 212, the two ends of the size line coincide with the straight line on which the side walls of the protrusion 212 are located). Each recess 211 has a different first size L1, and each protrusion 212 has a different second size L2. In other embodiments, the distance between adjacent two recesses 211 is different, and the distance between adjacent two protrusions 212 is also different. In this way, the structure can have different depths, the roughness of the welding area 10 can be improved, the light reflection phenomenon of the welding area 10 can be improved, the welding difficulty of the tab connecting portion 2 and the tab can be reduced, and the connection strength of the tab connecting portion 2 and the tab can be improved.
[0046] It should be noted that the forming manner of θ is not limited. In some embodiments, the heights of the plurality of protrusions 212 are arranged in a decreasing manner, and the depths of the plurality of recesses 211 are arranged in a decreasing manner along a direction in which the tab connecting portion 1 points to the post connecting portion 2. In this way, the first protrusion 212 is located on a side close to the tab connecting portion 1, and the first recess 211 is located on a side away from the tab connecting portion 1.
[0047] Please refer to Figure 1 and Figure 2 The shapes of the recesses 211 and the protrusions 212 are not limited, and specifically, the recesses 211 and the protrusions 212 are arranged in a random manner. The purpose of this arrangement is to improve the roughness of the welding area 10, so that the welding area 10 can better cope with high laser reflection. Specifically, in some embodiments, the shapes of the recesses 211 include at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon; and the shapes of the protrusions 212 include at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon. More specifically, in an embodiment, the shapes of the recesses 211 include a circle, an ellipse, a triangle, a square, and a rectangle; the circle, the ellipse, the triangle, the rectangle, and the square are arranged in a random manner; and the shapes of the protrusions 212 include a circle, an ellipse, a triangle, a square, and a rectangle; the circle, the ellipse, the triangle, the rectangle, and the square are arranged in a random manner. It should be noted that please refer to Figure 2 , Figure 2 The figure is a magnified schematic view of a part of the welding area 10. As can be seen from Figure 2 , in actual production, the shapes of the recesses 211 and the protrusions 212 are more irregular.
[0048] In some embodiments, the thickness of the tab connecting portion 1 is H3, and 0.5mm<H3<1.5mm. Specifically, the thickness of the tab connecting portion 1 can be 0.51mm, 0.53mm, 0.6mm, 0.62mm, 0.65mm, 0.68mm, 0.7mm, 0.75mm, 0.77mm, 0.8mm, 0.82mm, 0.88mm, 0.9mm, 0.91mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.49mm, or other data not listed.
[0049] In some embodiments, the thickness of the pole connecting part 2 is H4, wherein 0.5mm
[0050] Please refer to Figure 5 , Figure 6 and Figure 7 In some embodiments, the pole connecting part 2 is further provided with a non-welding area 20, which is arranged around the welding area 10. It should be noted that in this embodiment, the welding area 10 is arranged on the pole connecting part 2 by stamping forming, which will change the structural strength of the pole connecting part 2 itself. By arranging the non-welding area 20, only part of the pole connecting part 2 forms the welding area 10, which will only change the strength of part of the pole connecting part 2. The structural strength of the other part of the pole connecting part 2 (i.e. the non-welding area 20) remains unchanged, thereby avoiding the situation that the strength of the pole connecting part 2 is not enough.
[0051] More specifically, the non-welding area 20 can be a smooth surface, or regular embossing can be arranged on the surface of the pole connecting part 2 in the non-welding area 20 to improve the surface roughness of the entire pole connecting part 2.
[0052] It should be noted that the shape of the welding area 10 is not limited, which can be circular, annular, rectangular or square, and can be selected according to actual conditions.
[0053] In some embodiments, please refer to Figure 5 The welding area 10 includes an annular welding area 10, the surface area of the annular welding area 10 is S1, and the surface area of the non-welding area 20 is S2, wherein (21.75π)mm 2 ≤S1≤(S1+S2); when S1 is less than 21.75πmm 2When S1 is less than 24mm, the area of the welding area 10 is small, and the area with low laser light reflection is small, which leads to high laser light reflection of the welding area 10, and the welding of the welding area 10 and the pole post is difficult, which leads to low connection strength of the connecting sheet 100 and the pole post, and the connecting sheet 100 is prone to falling off.
[0054] In some embodiments, the welding area 10 includes at least one rectangular welding area 10, please refer to Figure 6 and Figure 7 The welding area 10 includes two rectangular welding areas 10, and the two rectangular welding areas 10 can be oppositely arranged along the width direction of the tab connecting part 1, or oppositely arranged along the length direction of the tab connecting part 1, which can be selected according to actual conditions.
[0055] Further, the surface area of the rectangular welding area 10 is S3, and the surface area of the non-welding area 20 is S2, wherein 24mm 2 ≤ S3 ≤ (S3 + S2). When S3 is less than 24mm 2 , the area of the welding area 10 is small, and the area with low laser light reflection is small, which leads to high laser light reflection of the welding area 10, and the welding of the welding area 10 and the pole post is difficult, which leads to low connection strength of the connecting sheet 100 and the pole post, and the connecting sheet 100 is prone to falling off. When S3 is greater than (S3 + S2), the welding area 10 occupies the entire pole post connecting part 2, and the roughness of the entire pole post connecting part 2 is reduced, so that the pole post connecting part 2 is easily corroded by water vapor in the air, which leads to low service life of the connecting sheet 100, and is not worth the loss.
[0056] In a second aspect, the utility model also provides a battery, battery includes pole post, tab and above-mentioned connecting sheet 100. Connecting sheet 100 is connected between pole post and tab, and the specific structure of connecting sheet 100 refers to the above-mentioned embodiment, because the battery adopts all technical solutions of the above-mentioned all embodiments, so at least has all beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.
[0057] In a third aspect, the utility model also provides a battery pack, and the battery pack includes a box body and a plurality of batteries as described above. The plurality of batteries are arranged in the box body. The specific structure of the battery is as described above. Since the battery pack adopts all technical solutions of the above-mentioned all embodiments, it at least has all beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.
[0058] In a fourth aspect, the utility model further provides a kind of electric equipment, and electric equipment includes above-mentioned battery pack.The specific structure of battery pack refers to above-mentioned embodiment, since the utility model electric equipment has adopted all technical solutions of above-mentioned embodiment, at least has all beneficial effects brought by the technical solution of above-mentioned embodiment, here no longer one by one elaboration.
[0059] It can be understood that the electric device includes, but is not limited to, electric toys, power tools, electric vehicles, cars, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc. The car can be a fuel car, a gas car, and a new energy car.
[0060] The above has carried out detailed introduction to the embodiment of the utility model, the principle and implementation mode of the utility model have been described in this paper by applying specific examples; The above embodiment is only used to help understand the method of the utility model and its core idea; At the same time, for those skilled in the art, according to the idea of the utility model, the specific implementation mode and application range will be changed; As described above, the content of the specification should not be understood as a limitation of the utility model.
Claims
1. A connecting piece for connecting a battery pole and a battery tab, characterized in that: Comprising: Tab connection part (1); and, Terminal connection part (2), connected to one side of the tab connection part (1), the terminal connection part (2) is provided with a welding area (10), the welding area (10) is used to contact the welding laser, and the surface of the terminal connection part (2) of the welding area (10) is provided with a plurality of recesses (211) and a plurality of protrusions (212). In the thickness direction of the terminal connection part, the vertical distance from the bottom of the recess (211) to the surface of the terminal connection part is H1, 0 < H1 ≤ 0.1 mm, and the vertical distance from the top of the protrusion (212) to the surface of the terminal connection part is H2, 0 < H2 ≤ 0.1 mm.
2. The connecting piece according to claim 1, characterized in that In the thickness direction of the tab connection part (1), the plurality of protrusions (212) include a first protrusion, the height of the first protrusion is higher than the height of the other protrusions (212), the plurality of recesses (211) include a first recess, the groove depth of the first recess is greater than the groove depth of the other recesses (211), and the included angle between the virtual connection line between the groove bottom of the first recess and the top of the first protrusion and the horizontal plane is θ, 0° < θ ≤ 20°.
3. The connecting piece according to claim 2, characterized in that: The sizes of the plurality of recesses (211) are different, and the sizes of the plurality of protrusions (212) are different.
4. The connecting piece according to claim 3, characterized in that Along the direction from the tab connection part (1) to the terminal connection part (2), the heights of the plurality of protrusions (212) are arranged in a decreasing manner, and the depths of the plurality of recesses (211) are arranged in a decreasing manner.
5. The connecting piece according to any one of claims 1 to 4, characterized in that: The shapes of the plurality of recesses (211) are different, and the shapes of the plurality of protrusions (212) are different.
6. The connecting piece according to claim 5, characterized in that The shape of the recess (211) includes at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon; and / or, The shape of the protrusion (212) includes at least two of a circle, an ellipse, an irregular circle, a polygon, and an irregular polygon.
7. The connecting piece according to any one of claims 1 to 4, characterized in that: The thickness of the tab connection part (1) is H3, 0.5 mm < H3 < 1.5 mm.
8. The connecting piece according to any one of claims 1 to 4, characterized in that: The terminal connection part (2) is further provided with a non-welding area (20), and the non-welding area (20) is arranged around the welding area (10).
9. The connecting piece according to claim 8, characterized in that: The welding area (10) includes an annular welding area, the surface area of the annular welding area is S1, and the surface area of the non-welding area (20) is S2, wherein (21.75π) mm 2 ≤S1≤(S1+S2); or, The welding area (10) includes at least one rectangular welding area, the surface area of the rectangular welding area is S3, the surface area of the non-welding area (20) is S2, wherein 24mm 2 ≤S3≤(S3+S2).
10. A battery, characterized in that: Including the connecting piece (100) according to any one of claims 1-9.