Battery

Abstract

The utility model relates to the technical field of batteries, in particular to a battery which comprises a pole group and a connecting piece, the connecting piece comprises a body and a pole welding protrusion part which are connected, the pole welding protrusion part is arranged on the body, the body abuts against a pole lug of the pole group, and at least one pole lug welding printing group is formed on the body through welding connection. And the tab welding print group comprises a plurality of welding prints which are sequentially arranged along the periphery of the pole welding lug boss. Therefore, after the connecting sheet is welded with the pole lugs of the pole group, the plurality of welding marks which are sequentially arranged around the periphery of the pole column welding lug boss are formed, so that compared with a linear welding mark group in the prior art, the integration level of the welding marks is high, the area utilization rate is improved, and the welding area of the pole group and the connecting sheet is increased in a limited area; therefore, the connection stability between the connecting sheet and the pole group is high, and the over-current capability and reliability of the battery are improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] At present, lithium-ion batteries mostly use connecting plates to connect the poles and the ears of the pole group. However, after the ears and the connecting plates are welded, a straight-line weld mark group is formed on the connecting plates. This welding area is small, the connection stability is poor, and the battery's current capacity and reliability are low. Utility Model Content

[0003] The purpose of the present application is to provide a battery which, to a certain extent, solves the technical problems existing in the prior art that after the electrode ear and the connecting piece are welded, a straight-line weld mark group is formed on the connecting piece, the welding area is small, the connection stability is poor, and the battery's current capacity and reliability are low.

[0004] The present application provides a battery, comprising: a pole group, a pole column and a connecting piece; wherein the connecting piece comprises a main body and a pole column welding protrusion connected to each other, the main body abuts against the pole lug of the pole group and is connected by welding to form at least one pole lug weld mark group on the main body, the pole lug weld mark group comprises a plurality of weld marks, and is sequentially arranged along the periphery of the pole column welding protrusion.

[0005] In the above technical solution, further, there are multiple electrode tab weld mark groups, wherein the weld marks in any two adjacent electrode tab weld mark groups are staggered.

[0006] In any of the above technical solutions, further, the tab weld mark group is ring-shaped.

[0007] In any of the above technical solutions, further, the tab weld mark group is in the form of a circular ring, an elliptical ring or a polygonal ring.

[0008] In any of the above technical solutions, further, the tab weld mark group is U-shaped.

[0009] In any of the above technical solutions, further, the number of the pole lug weld mark group is one and is in a spiral shape, and the pole lug weld mark group is arranged in a spiral shape around the pole welding protrusion.

[0010] In any of the above technical solutions, further, the welding grooves between two adjacent spiral parts of the tab weld mark group are arranged in a staggered manner.

[0011] In any of the above technical solutions, further, the maximum length of the weld mark is 0.05 to 0.2 mm.

[0012] In any of the above technical solutions, further, the pole welding protrusion is located at the center of the body.

[0013] In any of the above technical solutions, further, the main body is a square plate.

[0014] In any of the above technical solutions, further, the main body and the pole welding protrusion are an integrated structure.

[0015] In any of the above technical solutions, further, the connecting piece is made of aluminum or copper.

[0016] In any of the above technical solutions, further, the battery also includes a shell and a cover plate; wherein the electrode group is installed in the shell, and the cover plate is sealed on the open end of the shell; the pole is installed on the cover plate, and the pole passes through the cover plate and is sleeved on the pole welding protrusion of the battery, and is connected by welding.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] In the battery provided in the present application, after the connecting piece is welded to the pole ear of the pole group, a plurality of weld marks are sequentially arranged around the periphery of the welding protrusion of the pole column. Compared with the straight-line weld mark group in the prior art, the weld marks have a high degree of integration, which improves the area utilization rate. In a limited area, the welding area between the pole group and the connecting piece is increased, so that the connection stability between the connecting piece and the pole group is high, thereby improving the current carrying capacity and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic structural diagram of an assembly diagram of a connecting piece and a pole group provided in an embodiment of the present application;

[0021] Figure 2 for Figure 1 A schematic diagram of the structure of the connecting piece provided in the embodiment of the present application;

[0022] Figure 3 A cross-sectional view of the assembled connecting piece and the electrode group provided in an embodiment of the present application;

[0023] Figure 4 A cross-sectional view of a battery provided in an embodiment of the present application;

[0024] Figure 5 for Figure 4 A partial cross-sectional view of .

[0025] Reference numerals:

[0026] 1-pole group, 11-pole ear, 2-connecting piece, 21-body, 22-pole welding protrusion, 23-pole ear welding mark group, 231-welding mark, 3-pole, 4-shell, 5-cover plate. DETAILED DESCRIPTION

[0027] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0028] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0029] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are 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, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0032] Refer to the following Figures 1 to 5 A battery according to some embodiments of the present application is described.

[0033] See also Figures 1 to 5As shown, an embodiment of the present application provides a battery, comprising: a pole group 1, a pole column 3 and a connecting piece 2; wherein the connecting piece 2 comprises a main body 21 and a pole column welding protrusion 22 connected to each other, the main body 21 abuts against the pole ear 11 of the pole group 1, and is connected by welding to form at least one pole ear weld mark group 23 on the main body 21, the pole ear weld mark group 23 comprises a plurality of weld marks 231, and is sequentially arranged along the periphery of the pole column welding protrusion 22.

[0034] According to the structure described above, in the battery provided by the present application, after the connecting piece 2 is welded to the pole ear 11 of the pole group 1, a plurality of weld marks 231 are sequentially arranged around the periphery of the pole welding protrusion 22. Compared with the straight-line weld mark group in the prior art, the weld mark 231 has a high degree of integration, which improves the area utilization rate. In a limited area, the welding area between the pole group 1 and the connecting piece 2 is increased, so that the connection stability between the connecting piece 2 and the pole group 1 is high, thereby improving the current carrying capacity and reliability of the battery.

[0035] In this embodiment, preferably, Figure 2 As shown, any electrode tab weld mark group 23 is annular and is arranged around the electrode welding protrusion 22, which greatly improves the utilization rate of the area and facilitates the design of more electrode tab weld mark groups 23.

[0036] Further, preferably, Figure 2 As shown, any electrode ear weld mark group 23 is in the form of a circular ring with regular arrangement, which is convenient for arranging more weld marks 231. Of course, it is not limited to this. The electrode ear weld mark group 23 can also be in the form of an elliptical ring or a polygonal ring such as a square ring, etc., which is designed according to actual needs.

[0037] In this embodiment, preferably, Figure 2 As shown, there are multiple pole lug weld mark groups 23, and multiple welding pole lug 11 groups are arranged in a circular array in sequence with the pole welding protrusion 22 as the center, and the weld marks 231 in any two adjacent pole lug weld mark groups 23 are staggered, which improves the area utilization rate and ensures that the weld marks 231 are covered more evenly, further improves the connection stability between the connecting piece 2 and the pole group 1, and can also avoid stress concentration.

[0038] Of course, the weld marks 231 in any two adjacent tab weld mark groups 23 are not limited to being staggered, and can be designed based on actual needs.

[0039] It should be noted that any pole ear weld mark group 23 is not limited to the above-mentioned annular setting. The pole ear weld mark group 23 can also be U-shaped or spiral. When the pole ear weld mark group 23 is U-shaped and the number of the pole ear weld mark groups 23 is multiple, the pole column welding protrusion 22 can be taken as the center and arranged in sequence along the radial rays, or the U-shaped pole ear weld mark group 23 openings can be relatively arranged, etc., specifically designed according to actual needs. Of course, a combination structure of a U-shaped pole ear 11 welding group and a ring-shaped welding pole ear 11 can also be adopted, which is selected according to actual needs.

[0040] When the electrode tab weld mark group 23 is in a spiral shape, preferably, the number of the electrode tab weld mark group 23 is one, and the electrode tab weld mark group 23 is spirally arranged around the electrode welding protrusion 22 .

[0041] On the basis of the aforementioned structure, preferably, the welding grooves between two adjacent spiral parts of the spiral-shaped pole ear weld mark group 23 are staggered to improve the area utilization rate and ensure that the weld mark 231 is covered more evenly, further improve the connection stability between the connecting plate 2 and the pole group 1, and avoid stress concentration.

[0042] In this embodiment, preferably, Figure 2 As shown, the maximum length dimension of the weld mark 231 is 0.05 to 0.2 mm.

[0043] According to the structure described above, the size of the weld mark 231 is selected in the above-mentioned range of 0.05 to 0.2 mm, which is compatible with the diameter size of the laser.

[0044] In this embodiment, preferably, Figure 2 As shown, the pole welding protrusion 22 is located at the center of the body 21 .

[0045] According to the structure described above, the pole welding protrusion 22 is designed at the center of the body 21, so that the overall structure is more regular, and the structure of the periphery of the pole welding protrusion 22 is symmetrical, ensuring the uniformity of the distribution of the welding mark 231. Of course, it is not limited to the above-mentioned pole welding protrusion 22 being located at the center of the body 21, and the pole welding protrusion 22 can also be designed at other non-central positions, which is specifically designed according to actual needs.

[0046] In this embodiment, preferably, Figure 2 As shown, the body 21 is a square plate and is arranged parallel to the top of the pole group 1 .

[0047] According to the structure described above, the main body 21 is a square plate, which has a sufficient contact area with the tab 11, which helps to increase the number of weld marks, thereby improving the stability and reliability of welding.

[0048] It should be noted that the shape of the main body 21 is not limited to this, and can also be a circular plate, or a polygon with less than four sides such as a triangle, or a polygon with more than four sides such as a pentagon or hexagon, etc., and the specific design is based on actual needs.

[0049] In this embodiment, preferably, Figure 2 As shown, the pole welding protrusion 22 is cylindrical and regular in shape, which is convenient for processing and manufacturing and easy to assemble with the pole 3.

[0050] In this embodiment, preferably, Figure 2 As shown, the body 21 and the pole welding protrusion 22 are an integrated structure, which has high overall strength, is not easy to damage, and is easy to manufacture. Of course, the body 21 and the pole welding protrusion 22 are not limited to being an integrated structure, and the body 21 and the pole 3 can also be a split structure, and the two can be connected by welding, etc.

[0051] In this embodiment, preferably, the connecting piece 2 is made of aluminum or copper.

[0052] According to the structure described above, when the connecting piece 2 is used to connect the positive electrode column 3 and the pole ear 11 of the pole group 1, the material of the connecting piece 2 can be selected as aluminum. Aluminum, as a positive electrode material, has a high oxidation potential, which means that it can carry more reactions and electrons, providing a good foundation for the performance of the battery; when the connecting piece 2 is used to connect the negative electrode column 3 and the pole ear 11 of the pole group 1, the material of the connecting piece 2 can be selected as copper. Copper material has excellent electrical conductivity, which is much higher than other metals such as iron, zinc, etc., and is corrosion-resistant.

[0053] In this embodiment, preferably, Figure 2 As shown, the weld mark 231 is circular or quasi-circular, but is not limited thereto and can be designed based on actual needs.

[0054] In this embodiment, preferably, Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, the pole welding protrusion 22 is arranged on the upper surface of the body 21 and extends toward one side of the pole 3 . The body 21 can be installed on the top of the pole lug 11 and welded to the pole lug 11 .

[0055] In this embodiment, preferably, Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the battery also includes a shell 4, a cover plate 5 and a pole 3; wherein the pole group 1 is installed in the shell 4, and the cover plate 5 is sealed on the open end of the shell 4; the pole 3 is installed on the cover plate 5, and the pole 3 passes through the cover plate 5 and is sleeved on the pole welding protrusion 22, and is connected by welding. That is, the cover plate 5 is formed with a mounting through hole, the pole 3 is installed in the mounting through hole, and the top and bottom ends of the pole 3 extend to the top and bottom of the cover plate 5 respectively, the pole 3 is provided with a welding through hole, and the pole welding protrusion 22 of the connecting piece 2 is inserted into the welding through hole, and can be connected by welding, so that the connection between the pole 3 and the welding protrusion is more stable.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: include: A pole group and a connecting piece; wherein the connecting piece includes a main body and a pole welding protrusion connected to each other, the main body abuts against the pole ear of the pole group and is connected by welding to form at least one pole ear weld mark group on the main body, the pole ear weld mark group includes a plurality of weld marks, and is sequentially arranged along the periphery of the pole welding protrusion.

2. The battery according to claim 1, characterized in that There are multiple electrode tab weld mark groups, and the weld marks in any two adjacent electrode tab weld mark groups are arranged alternately.

3. The battery according to claim 1, characterized in that The electrode ear welding mark group is ring-shaped.

4. The battery according to claim 3, characterized in that The tab weld mark group is in the form of a circular ring, an elliptical ring or a polygonal ring.

5. The battery according to claim 1, characterized in that The electrode ear welding mark group is U-shaped.

6. The battery according to claim 1, characterized in that The number of the electrode lug welding mark group is one and the electrode lug welding mark group is in a spiral shape, and the electrode lug welding mark group is spirally arranged around the electrode column welding protrusion.

7. The battery according to claim 6, characterized in that The welding grooves between two adjacent spiral parts of the electrode tab welding mark group are arranged in a staggered manner.

8. The battery according to claim 1, characterized in that The maximum length of the weld mark is 0.05-0.2 mm.

9. The battery according to claim 1, characterized in that The pole welding protrusion is located at the center of the body; and / or The body is a square plate; and / or The main body and the pole welding protrusion are an integrated structure; and / or The connecting piece is made of aluminum or copper.

10. The battery according to any one of claims 1 to 9, characterized in that The battery also includes a shell, a cover plate and a pole; wherein the pole group is installed in the shell, and the cover plate is sealed on the open end of the shell; the pole is installed on the cover plate, and the pole passes through the cover plate and is sleeved on the pole welding protrusion of the battery, and is connected by welding.

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