Tab structure

Abstract

The utility model relates to the field of batteries, and particularly discloses a tab structure which is provided with an embedded part and an exposed part, one end of the embedded part is connected with the electrode core, and the extending end of the embedded part is welded with the exposed part; an auxiliary welding part is arranged on the extending end; the welding part comprises a welding plate, a first auxiliary plate and a second auxiliary plate, and the two sides of the welding plate are fixed to the first auxiliary plate and the second auxiliary plate respectively; one end of the welding plate is fixed on the upper surface of the extension part, and the other end of the welding plate is in contact with the upper surface of the exposed part; the welding plate, the extending end and the end of the exposed part form an auxiliary welding area, and the structure of the first auxiliary plate and the structure of the second auxiliary plate are matched with the auxiliary welding area.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the battery field, especially relate to the tab structure. BACKGROUND

[0002] In the battery manufacturing process, the welding quality of the tab is crucial to the overall performance of the battery. As a key component connecting the internal electrode of the battery and the external circuit, the design and manufacturing process of the tab directly relates to the energy density, charge and discharge efficiency, and safety performance of the battery. Traditionally, the tail of the tab is directly connected to the electrode core body by welding, but this design has some inherent challenges and limitations; for example, the significant thickness difference between the tab tail and the electrode core body is a major problem. Due to the difference in physical properties, especially the thermal conductivity and melting point of metal materials, uneven heat distribution may occur during welding. This not only affects the quality and reliability of the welding, but also increases the risk of producing defective welds (such as cold or cold welds), which can weaken the stability of the electrical connection and potentially cause local resistance to increase, leading to heat generation, power loss, and even safety risks. SUMMARY

[0003] The utility model provides tab structure, solve above -mentioned problem.

[0004] To solve the above problems, the technical scheme provided by the utility model is as follows: a tab structure; the connection of the electrode core and the tab; the tab is provided with an embedded part and an exposed part; one end of the embedded part is connected to the electrode core, and the extension end of the embedded part is welded to the exposed part; an auxiliary welding part is provided on the extension end; the welding part includes a welding plate, a first auxiliary plate and a second auxiliary plate, and the first auxiliary plate and the second auxiliary plate are fixed on both sides of the welding plate; one end of the welding plate is fixed on the upper surface of the extension end, and the other end of the welding plate is in contact with the upper surface of the exposed part; the welding plate, the extension end and the end part of the exposed part form an auxiliary welding area, and the structure of the first auxiliary plate and the structure of the second auxiliary plate match the auxiliary welding area.

[0005] Preferred technical scheme; one end of the welding plate is flexibly connected to the upper surface of the extension end.

[0006] Preferred technical scheme; when the other end of the welding plate is in contact with the upper surface of the end part of the exposed part, the other end of the welding plate is misaligned with the upper surface of the exposed part.

[0007] Preferred technical scheme; the first auxiliary plate is combined with the welding plate through a flexible part; the second auxiliary plate is combined with the welding plate through a flexible part.

[0008] Preferably, a middle part of the other end of the extending end is provided with a notch when being welded with the exposed part.

[0009] Preferably, the outer surface of the welding plate is wrapped with a protective layer, and the material of the protective layer is nickel.

[0010] Preferably, the outer surface layers of the first auxiliary plate and the second auxiliary plate successively comprise a base layer, a first coating layer and a second coating layer; the base layer is an aluminum layer, the first coating layer is a nickel layer, and the second coating layer is a tin layer.

[0011] Compared with the prior art, the beneficial effects are that, by adopting the above scheme, the extending end is aligned with the lower surface of the exposed part for welding, and the welding plate is aligned with the upper surface of the exposed part for welding, so as to solve the transverse bonding strength of the welding between the embedded part and the exposed part; the first auxiliary plate and the second auxiliary plate are respectively welded at both sides of the joint between the welding plate and the extending end, so as to enhance the longitudinal bonding strength of the embedded part and the exposed part. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the embedded part in use of the utility model;

[0015] Figure 3 It is a schematic diagram of the embedded part of the utility model not in use;

[0016] Figure 4 It is a schematic diagram of the welding between the welding plate and the exposed part of the utility model;

[0017] According to the above legend: electrode core-1; extending end-2; exposed part-3; welding part-4; welding plate-41; first auxiliary plate-42; flexible part-43; second auxiliary plate-44. DETAILED DESCRIPTION

[0018] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] It should be noted that when a component is described as being "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is described as being "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "fixed," "integral," "left," "right," and similar expressions used in this specification are for illustrative purposes only, and in the figures, structurally similar units are labeled with the same reference numerals.

[0020] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0021] like Figures 1-4 As shown, one embodiment of this utility model is as follows: the electrode tab structure is provided with an electrode core 1 connected to the electrode tab; the electrode tab is provided with an embedded part and an exposed part 3; one end of the embedded part is connected to the electrode core 1, and the extended end 2 of the embedded part is welded to the exposed part 3; an auxiliary welding part 4 is provided on the extended end 2; the welding part 4 includes a welding plate 41, a first auxiliary plate 42 and a second auxiliary plate 44, which are fixed to the first auxiliary plate 42 and the second auxiliary plate 44 on both sides of the welding plate 41 respectively; one end of the welding plate 41 is fixed to the upper surface of the extended end, and the other end of the welding plate 41 is in contact with the upper surface of the exposed part 3; the ends of the welding plate 41, the extended end 2 and the exposed part 3 together form an auxiliary welding area, and the structures of the first auxiliary plate 42 and the second auxiliary plate 44 match the auxiliary welding area.

[0022] It should be noted that when welding the extension end 2 of the embedded part to one end of the exposed part 3, since the thickness of the extension end 2 is less than the thickness of the exposed part 3, the lower surfaces of the end of the extension end 2 and the end of the exposed part 3 need to be aligned and welded first. Then, the welding end of the welding part 4 is aligned and welded to the upper surface of the end of the exposed part 3. Then, the first auxiliary plate 42 is welded to one side of the joint between the welding plate 41 and the extension end 2, and the second auxiliary plate 44 is welded to the opposite side of the joint between the welding plate 41 and the extension end 2. By aligning and welding the lower surface of the extension end 2 and the upper surface of the exposed part 3, and aligning and welding the upper surface of the welding plate 41 and the exposed part 3, the transverse bonding strength of the embedded part and the exposed part 3 is solved. By welding the first auxiliary plate 42 and the second auxiliary plate 44 to both sides of the joint between the welding plate 41 and the extension end 2, the longitudinal bonding strength of the embedded part and the exposed part 3 is enhanced.

[0023] Example 2: One end of the welding plate 41 is flexibly connected to the upper surface of the extension end.

[0024] It should be noted that, in order to facilitate the welding of the extension end 2 of the embedded part and the end of the exposed part 3, since one end of the welding plate 41 is flexibly connected to the extension part, the welding plate 41 can be flipped first, so as not to affect the welding of the extension end and the exposed part 3.

[0025] Example 3: When the other end of the welding plate 41 is attached to the upper surface of the end of the exposed part 3, the other end of the welding plate 41 is misaligned with the upper surface of the exposed part 3.

[0026] It should be noted that in order to ensure a firm bond between the welding plate 41 and the exposed part 3, the upper surfaces of the welding plate 41 and the exposed part 3 are misaligned to form a welding bevel. This makes the welding process easier and ensures a firm weld, reducing the likelihood of false welds.

[0027] Furthermore, the first auxiliary plate 42 is combined with the welding plate 41 through the flexible part 43; the second auxiliary plate 44 is combined with the welding plate 41 through the flexible part 43.

[0028] It should be noted that: Similarly, when welding the lower surface of the extension end 2 and the exposed part 3, if the welding plate 41 is simply flipped, the material of the flexible connection is too soft and cannot meet the input of the corresponding current specification. This limits the flipping angle and the material of the flexible connection. Therefore, the above problems can only be solved by flipping the first auxiliary plate 42 and the second auxiliary plate 44 in the same way.

[0029] Furthermore, a notch is provided in the middle of the other end of the extension 2 that is welded to the exposed portion 3.

[0030] It should be noted that by setting a notch on the extension end 2, only the joint between the two parts is welded during the welding process. The joint is often quite tight, which can easily cause false welding. By setting the notch, the strength of the welding machine is guaranteed.

[0031] Example 4: The outer surface of the welding plate 41 is covered with a protective layer, and the material of the protective layer is nickel.

[0032] The outer surfaces of the first auxiliary plate 42 and the second auxiliary plate 44 sequentially include a base layer, a first cladding layer, and a second cladding layer; the base layer is an aluminum layer, the first cladding layer is a nickel layer, and the second cladding layer is a tin layer.

[0033] It should be noted that the above-mentioned technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification; and, for those skilled in the art, improvements or modifications can be made based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims of this utility model.

Claims

1. A tab structure, characterized in that; The electrode core is connected to the electrode tab; the electrode tab has an embedded part and an exposed part; one end of the embedded part is connected to the electrode core, and the extended end of the embedded part is welded to the exposed part; an auxiliary welding part is provided on the extended end; the welding part includes a welding plate, a first auxiliary plate and a second auxiliary plate, which are fixed to the first auxiliary plate and the second auxiliary plate on both sides of the welding plate respectively; one end of the welding plate is fixed to the upper surface of the extended end, and the other end of the welding plate is in contact with the upper surface of the exposed part; the welding plate, the extended end and the end of the exposed part together form an auxiliary welding area, and the structure of the first auxiliary plate and the structure of the second auxiliary plate are matched with the auxiliary welding area.

2. The electrode structure according to claim 1, characterized in that; One end of the welding plate is flexibly connected to the upper surface of the extension end.

3. The electrode structure according to claim 2, characterized in that; When the other end of the welding plate is attached to the upper surface of the exposed part, the other end of the welding plate is misaligned with the upper surface of the exposed part.

4. The electrode structure according to claim 1, characterized in that; The first auxiliary plate is combined with the welding plate through a flexible part; the second auxiliary plate is combined with the welding plate through a flexible part.

5. The electrode structure according to claim 1, characterized in that; A notch is provided in the middle of the other end of the extension which is welded to the exposed portion.

6. The electrode structure according to claim 1, characterized in that; The outer surface of the welding plate is covered with a protective layer, which is made of nickel.

7. The electrode structure according to claim 1, characterized in that; The outer surfaces of the first auxiliary plate and the second auxiliary plate sequentially include a base layer, a first cladding layer, and a second cladding layer; the base layer is an aluminum layer, the first cladding layer is a nickel layer, and the second cladding layer is a tin layer.

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