Special tab for lithium-ion battery composite current collector

Abstract

The utility model discloses a special-shaped tab suitable for lithium ion battery composite current collector, including body and tab rubber, the other end of body has the second welding part that is in conduction with the composite current collector and outwardly extends, the second welding part is two settings, two second welding parts are in conduction with the two welding surfaces of composite current collector respectively, and cooperate two second welding parts to be in conduction with the outside through the first welding part, when it is connected with the composite current collector, can be in conduction with the upper and lower surfaces of composite current collector respectively through two second welding parts, and is in conduction with the external circuit of battery through the first welding part, thereby satisfy its connection process with the composite current collector, and the use limited nature is smaller.

Description

Technical Field

[0001] This utility model relates to the field of lithium-ion batteries, and in particular to a non-circular electrode tab adapted to a composite current collector in lithium-ion batteries. Background Technology

[0002] A lithium-ion battery is a rechargeable battery that primarily functions by the movement of lithium ions between the positive and negative electrodes. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, leaving the negative electrode in a lithium-rich state; the reverse occurs during discharging. A lithium-ion battery is electrically connected to the outside world through contact between the current collector and the electrode tabs.

[0003] The current collector is made of pure aluminum foil (positive electrode) or pure copper foil (negative electrode). Positive and negative electrode sheets are formed by coating both sides of the current collector with a layer of positive and negative electrode material. Currently, the tab only needs one contact point to conduct electricity with the current collector. With the development of lithium-ion batteries, current current collectors have evolved into composite current collectors. Composite current collectors have a three-layer structure, with a PET film (or other plastic film) in the middle. Aluminum or copper is plated on both sides of the composite current collector. After plating, the top and bottom sides are insulating, and cannot conduct electricity after the positive and negative electrode paste is applied. Therefore, the existing tab cannot achieve simultaneous contact and conduction between the positive and negative electrodes of the composite current collector, limiting the use of the current tab structure. Therefore, it is necessary to further improve the existing tab structure. Utility Model Content

[0004] In view of this, the present invention addresses the deficiencies of the existing technology, and its main purpose is to provide a non-circular electrode tab that is adapted to the composite current collector of lithium-ion batteries, which can effectively solve the problem that the existing lithium-ion battery electrode tabs cannot be applied to composite current collectors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A non-circular tab adapted to a lithium-ion battery composite current collector includes a body and tab adhesive; one end of the body extends outward with a first welding part that contacts and conducts with the external circuit of the battery; the other end of the body extends outward with a second welding part that conducts with the composite current collector, and two second welding parts are provided, the two second welding parts respectively contacting and conducting with the upper and lower surfaces of the composite current collector, and the two second welding parts are connected to the outside through the first welding part; the tab adhesive is disposed on the body and located on the first welding part.

[0007] As a preferred embodiment, the outer end of the body facing the composite current collector is formed with a through groove, which isolates one end of the body facing the composite current collector to form two second welding parts.

[0008] As a preferred embodiment, the body is made of pure aluminum, pure nickel, pure copper, or copper plated with nickel.

[0009] As a preferred embodiment, one of the second welding parts is integrally formed with the first welding part, and one end of the other second welding part is connected and conductive to the first welding part.

[0010] As a preferred embodiment, one end of the second welded part is connected to the first welded part by laser spot welding or ultrasonic welding.

[0011] As a preferred embodiment, the main body consists of two bodies arranged vertically at intervals, each body including an integrally formed first welding part and a second welding part; the tab adhesive is disposed on the first welding part of the two bodies and connects the two bodies together.

[0012] As a preferred embodiment, each body has a tab adhesive on its first welding part, and the two bodies are bonded together by the two tab adhesives.

[0013] As a preferred embodiment, the main bodies are two arranged at intervals on the same plane, and each main body includes an integrally formed first welding part and a second welding part; the tab adhesive is simultaneously applied to the upper and lower surfaces of the first welding parts of the two main bodies and connects the two main bodies together.

[0014] Compared with the prior art, this utility model has obvious advantages and beneficial effects. Specifically, as can be seen from the above technical solution:

[0015] Two second welding parts extend outward from the other end of the main body and are in contact with the composite current collector. The two second welding parts are respectively in contact with the two welding surfaces of the composite current collector and are connected to the outside through the first welding part. When connected to the composite current collector, the two second welding parts can be in contact with the upper and lower surfaces of the composite current collector and connected to the external circuit of the battery through the first welding part. This satisfies the connection process with the composite current collector and reduces the limitations of its use.

[0016] To more clearly illustrate the structural features and effects of this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a top view of the first preferred embodiment of the present utility model;

[0018] Figure 2 This is a schematic diagram of the usage state of the first preferred embodiment of this utility model;

[0019] Figure 3 This is a top view of the first preferred embodiment of the present invention in its usage state;

[0020] Figure 4 This is a top view of another usage state of the first preferred embodiment of this utility model;

[0021] Figure 5 This is a top view of the second preferred embodiment of the present invention;

[0022] Figure 6 This is a bottom view of the second preferred embodiment of the present invention;

[0023] Figure 7 This is a cross-sectional view of the second preferred embodiment of the present invention;

[0024] Figure 8 This is a cross-sectional view of the third preferred embodiment of the present invention;

[0025] Figure 9 This is another cross-sectional view of the third preferred embodiment of the present invention;

[0026] Figure 10 This is a top view of the fourth preferred embodiment of the present invention;

[0027] Figure 11 This is a cross-sectional view of the fourth preferred embodiment of the present invention.

[0028] Explanation of reference numerals in the attached diagram:

[0029] 10. Body 101, slot

[0030] 11. First welding section 12. Second welding section

[0031] 20. Electrode adhesive 30. Composite current collector. Detailed Implementation

[0032] Please refer to Figures 1 to 4 As shown, it illustrates the specific structure of the first preferred embodiment of the present invention, which includes a body 10 and tab adhesive 20.

[0033] One end of the body 10 extends outward with a first welding portion 11 that is in contact with and connected to the external circuitry of the battery; the other end of the body 10 extends outward with a second welding portion 12 that is in contact with and connected to the composite current collector 30. Two second welding portions 12 are provided, each contacting and connecting to the upper and lower surfaces of the composite current collector 30 respectively. The two second welding portions 12 are connected to the outside through the first welding portion 11, thus simultaneously connecting both welding surfaces of the composite current collector 30 to the outside. In this embodiment, a through groove 101 is formed inward from the outer end of the body 10 facing the composite current collector 30. The through groove 101 isolates the end of the body 10 facing the composite current collector 30, forming two second welding portions 12, which are integrally formed with the first welding portion 11. During processing, the two second welding portions 12 can be directly formed by cutting or trimming from the existing electrode structure. The body 10 is made of pure aluminum, pure nickel, pure copper, or copper-plated nickel.

[0034] The tab adhesive 20 is disposed on the body 10 and located on the first welding part 11. The tab adhesive 20 is located on the first welding part 11 near the end of the second welding part 12. The tab adhesive 20 is divided into upper and lower pieces, which are hot-pressed onto the upper and lower surfaces of the body 10 and overlapped.

[0035] Please refer to Figures 5 to 7 As shown, it illustrates the specific structure of the second preferred embodiment of the present invention, which is basically the same as the structure of the aforementioned first preferred embodiment, except that:

[0036] In this embodiment, one of the second welding parts 12 is integrally formed with the first welding part 11, and one end of the other second welding part 12 is connected and conductively connected to the first welding part 11. This allows for the addition of another second welding part 12 to an existing electrode structure. One end of the other second welding part 12 is connected and conductively connected to the first welding part 11 by laser spot welding or ultrasonic welding. In other embodiments, the second welding part 12 can also be formed on the first welding part 11 by other means, as long as the structural strength and the conductivity between the second welding part 12 and the first welding part 11 are satisfied.

[0037] Please refer to Figures 8 to 9 As shown, it illustrates the specific structure of the third preferred embodiment of the present invention, which is basically the same as the structure of the aforementioned first preferred embodiment, except that:

[0038] In this embodiment, there are two bodies 10 arranged vertically at intervals. Each body 10 includes an integrally formed first welding part 11 and a second welding part 12. The two second welding parts 12 are respectively connected to the upper and lower surfaces of the composite current collector. By setting two first welding parts 11, the contact area with the outside can be ensured while reducing the size of the first welding parts 11. This allows the two smaller first welding parts 11 to be welded to the outside, which satisfies the welding process of PCB boards with small welding areas. Thus, the external circuit is connected to the upper and lower surfaces of the composite current collector through the two first welding parts 11 and the two second welding parts 12. This allows it to be applied to more products and application scenarios.

[0039] The tab adhesive 20 is disposed on the first welding portion 11 of the two bodies 10 and connects the two bodies 10 together. Further, each body 10 has a tab adhesive 20 disposed on its first welding portion 11, and the two bodies 10 are bonded together by two tab adhesives 20. The tab adhesive 20 is divided into three parts, located on the upper surface of the upper body 10, between the two bodies 10, and on the lower surface of the lower body 10, with the three parts of the tab adhesive 20 overlapping each other. The portion between the two bodies 10 can use a single piece of tab adhesive 20 (e.g., ...). Figure 8 As shown), a two-piece tab adhesive solution can also be used (e.g. Figure 9 (As shown).

[0040] Please refer to Figures 10 to 11 As shown, it illustrates the specific structure of the fourth preferred embodiment of the present invention, which is basically the same as the structure of the aforementioned first preferred embodiment, except that:

[0041] In this embodiment, the two bodies 10 are arranged at intervals on the same plane, and each body 10 includes an integrally formed first welding part 11 and a second welding part 12; the tab adhesive 20 is simultaneously disposed on the upper and lower surfaces of the first welding parts 11 of the two bodies 10 and connects the two bodies 10 together. This structure can effectively improve the overall width of the tab and the high-current charging and discharging performance, thereby meeting the usage requirements in some special scenarios.

[0042] The key design feature of this invention is that a second welding part extends outward from the other end of the main body and is in communication with the composite current collector. There are two second welding parts, which respectively contact and communicate with the two welding surfaces of the composite current collector. In conjunction with the two second welding parts, they are connected to the outside through the first welding part. When connected to the composite current collector, the two second welding parts can contact and communicate with the upper and lower surfaces of the composite current collector respectively, and are connected to the external circuit of the battery through the first welding part. This satisfies the connection process with the composite current collector and reduces the limitations of its use.

[0043] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A shaped tab adapted for a lithium-ion battery composite current collector, comprising a body and a tab adhesive; characterized in that: One end of the body outwardly extends a first welding part in contact with the external circuit of the battery; the other end of the body outwardly extends a second welding part in contact with the composite current collector, the second welding part is provided in two, the two second welding parts are respectively in contact with the upper and lower surfaces of the composite current collector, and the two second welding parts are in contact with the external circuit through the first welding part; the tab rubber is arranged on the body and located on the first welding part.

2. The shaped tab adapted for a lithium-ion battery composite current collector of claim 1, wherein: The body is inwardly formed with a through groove towards the outer end surface of the composite current collector, and the through groove separates the one end of the body towards the composite current collector to form the two second welding parts.

3. The shaped tab adapted for a lithium-ion battery composite current collector of claim 1, wherein: The body is made of pure aluminum material, pure nickel material, pure copper material or copper plated nickel material.

4. The shaped tab adapted for a lithium-ion battery composite current collector of claim 1, wherein: One of the second welding parts is integrally formed with the first welding part, and the other second welding part is connected in contact with the first welding part at one end.

5. The shaped tab adapted for a lithium-ion battery composite current collector of claim 4, wherein: The other second welding part is connected in contact with the first welding part at one end through laser spot welding or ultrasonic welding.

6. The shaped tab adapted for a lithium-ion battery composite current collector of claim 1, wherein: The body is arranged in two in an upper and lower interval, and each body comprises an integrally formed first welding part and a second welding part; the tab rubber is arranged on the first welding parts of the two bodies and connects the two bodies together.

7. The shaped tab adapted for a lithium-ion battery composite current collector of claim 6, wherein: The first welding part of each body is provided with a tab rubber, and the two bodies are bonded together through the two tab rubbers.

8. The shaped tab adapted for a lithium-ion battery composite current collector of claim 1, wherein: The body is arranged in two in the same plane, and each body comprises an integrally formed first welding part and a second welding part; the tab rubber is arranged on the upper and lower surfaces of the first welding parts of the two bodies and connects the two bodies together.

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