Tab structure and sodium ion battery

Abstract

The utility model provides a tab structure and a sodium ion battery. The tab structure is used for being connected with a collector plate structure; the tab structure comprises a nickel strip body and an aluminum strip body which are stacked, the nickel strip body is provided with a first connecting part used for being welded with the shell structure, the aluminum strip body is provided with a second connecting part used for being welded with the collector plate structure, and the first connecting part and the second connecting part are diagonally arranged. According to the tab structure, the connection stability between the collector plate structure and the roll core structure is relatively good.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sodium ion batteries, and in particular to a tab structure and a sodium ion battery. Background Art

[0002] Sodium-ion batteries (SIBs) are secondary batteries that rely on the movement of sodium ions between positive and negative electrodes. They are widely used in electric vehicles, energy storage devices, electronics, drones, smartwatches, and aerospace applications. They consist of a tab structure and a current collector plate, with the tabs connected to the collector plate.

[0003] In the prior art, the traditional tab structure includes a nickel strip and an aluminum strip. The nickel strip is provided with a nickel connecting portion for welding to the shell structure. The nickel connecting portion is provided with an installation cavity. The aluminum strip is provided with a connecting boss. The connecting boss passes through the installation cavity and is connected to the nickel connecting portion, so that the nickel strip and the aluminum strip are connected in a long strip shape. The end of the aluminum strip away from the connecting boss is provided with an aluminum connecting portion for welding to the collecting plate structure, such as the Chinese patent No. CN202323385269.X.

[0004] However, since the end of the aluminum strip body away from the connecting boss is provided with an aluminum connecting portion for welding to the collecting plate structure, the tab structure is used for welding to the collecting plate structure, and the nickel strip body is connected to the aluminum strip body in a long strip shape, that is, the tab structure is a long strip, which makes the overall length of the tab structure longer, so that the tab structure needs to cover a larger area of ​​space when welded to the collecting plate structure, as shown in the accompanying drawings of the specification. Figure 1 As shown, the welding area of ​​the collecting disc structure that can be welded to the core structure is smaller, so that the number of connection welding points between the collecting disc structure and the core structure is smaller, resulting in poor welding strength between the collecting disc structure and the core structure, and further poor connection stability between the collecting disc structure and the core structure. Utility Model Content

[0005] The purpose of the present disclosure is to overcome the deficiencies in the prior art and provide a tab structure and a sodium ion battery that have better connection stability between the current collecting disc structure and the winding core structure.

[0006] The purpose of this disclosure is achieved through the following technical solutions:

[0007] A tab structure is used to connect to a current collecting plate structure. The tab structure includes a stacked nickel strip and an aluminum strip. The nickel strip is provided with a first connecting portion for welding to a shell structure, and the aluminum strip is provided with a second connecting portion for welding to the current collecting plate structure. The first connecting portion and the second connecting portion are arranged diagonally.

[0008] In one embodiment, the nickel strip is further provided with a first adhesive layer, and the aluminum strip is further provided with a second adhesive layer, and the first adhesive layer and the second adhesive layer are bonded to each other so that the nickel strip and the aluminum strip are laminated and bonded.

[0009] In one embodiment, the first adhesive layer and the second adhesive layer are both epoxy resin adhesive layers.

[0010] In one embodiment, the tab structure is configured to be tilted at a predetermined angle to the current collecting plate structure.

[0011] In one embodiment, the predetermined angle is 15° to 45°.

[0012] In one embodiment, the predetermined angle is 30°.

[0013] In one embodiment, the length of the tab structure is 2 mm to 4 mm.

[0014] In one embodiment, the nickel strip and the first connecting portion are an integrally formed structure.

[0015] In one embodiment, the aluminum strip and the second connecting portion are an integrally formed structure.

[0016] A sodium ion battery comprises a shell structure, a current collecting disc structure, a winding core structure, and the tab structure described in any of the above embodiments, wherein the winding core structure is located within the shell structure and connected to the shell structure, the current collecting disc structure is welded to the winding core structure, and the tab structure is respectively welded to the shell structure and the current collecting disc structure.

[0017] Compared with the prior art, the present disclosure has at least the following advantages:

[0018] Since the aluminum strip is provided with a second connection portion for welding to the current collecting disk structure, the pole ear structure is used to weld to the current collecting disk structure through the second connection portion. The pole ear structure includes a nickel strip and an aluminum strip that are stacked, so that the pole ear structure is stacked, which increases the overall thickness of the pole ear structure and reduces the overall length of the pole ear structure, so that the overall length of the pole ear structure is shorter, so that the pole ear structure needs to cover a smaller space area when welded to the current collecting disk structure, so that the current collecting disk structure can have a larger welding area for welding to the core structure, so that the number of connecting welding points between the current collecting disk structure and the core structure is larger, so that the welding strength between the current collecting disk structure and the core structure is better, and further the connection stability between the current collecting disk structure and the core structure is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a structural schematic diagram of the welding of the tab structure and the collecting plate structure in the background art;

[0021] Figure 2 This is a schematic structural diagram of a tab structure according to an embodiment;

[0022] Figure 3 for Figure 2 A schematic structural diagram of the tab structure from another perspective is shown. DETAILED DESCRIPTION

[0023] To facilitate understanding of the present disclosure, a more comprehensive description of the present disclosure will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present disclosure. However, the present disclosure 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 comprehensive understanding of the disclosure.

[0024] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are intended only to describe specific embodiments and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] The present disclosure provides a tab structure for connecting with a current collecting plate structure.

[0027] Furthermore, the tab structure includes a stacked nickel strip and an aluminum strip, the nickel strip is provided with a first connection portion for welding to the shell structure, and the aluminum strip is provided with a second connection portion for welding to the collecting plate structure, and the first connection portion and the second connection portion are arranged diagonally.

[0028] The above-mentioned pole lug structure is provided with a second connecting portion for welding to the collecting disk structure on the aluminum strip, so that the pole lug structure is used to be welded to the collecting disk structure through the second connecting portion. The pole lug structure includes a nickel strip and an aluminum strip arranged in a stacked manner, so that the pole lug structure is stacked, the overall thickness of the pole lug structure is increased, and the overall length of the pole lug structure is reduced, so that the overall length of the pole lug structure is shorter, so that the pole lug structure needs to cover a smaller space area when welded to the collecting disk structure, so that the collecting disk structure can have a larger welding area for welding to the core structure, so that the number of connecting welding points between the collecting disk structure and the core structure is larger, so that the welding strength between the collecting disk structure and the core structure is better, and further the connection stability between the collecting disk structure and the core structure is better.

[0029] In order to better understand the technical solutions and beneficial effects of the present disclosure, the present disclosure is further described in detail below with reference to specific embodiments:

[0030] like Figures 2 to 3 As shown, the tab structure 10 of one embodiment is used to connect with the current collecting plate structure 20 .

[0031] Furthermore, the tab structure 10 includes a stacked nickel strip 100 and an aluminum strip 200. The nickel strip 100 is provided with a first connection portion 110 for welding to the shell structure, and the aluminum strip 200 is provided with a second connection portion 210 for welding to the collecting plate structure 20. The first connection portion 110 and the second connection portion 210 are arranged diagonally.

[0032] In this embodiment, the nickel strip 100 is provided with a first connection portion 110 for welding to the shell structure, so that the tab structure 10 is welded to the shell structure through the first connection portion 110; the aluminum strip 200 is provided with a second connection portion 210 for welding to the current collecting plate structure 20, so that the tab structure 10 is welded to the current collecting plate structure 20 through the second connection portion 210.

[0033] The above-mentioned tab structure 10 is provided with a second connecting portion 210 for welding to the current collecting disk structure 20 on the aluminum strip 200, so that the tab structure 10 is used to be welded to the current collecting disk structure 20 through the second connecting portion 210. The tab structure 10 includes a nickel strip 100 and an aluminum strip 200 that are stacked, so that the tab structure 10 is in a stacked shape, which increases the overall thickness of the tab structure 10 and reduces the overall length of the tab structure 10, so that the overall length of the tab structure 10 is shorter, so that the tab structure 10 needs to cover a smaller area of ​​space when welded to the current collecting disk structure 20, so that the current collecting disk structure 20 can be welded to the core structure with a larger welding area, so that the number of connecting welds 201 between the current collecting disk structure 20 and the core structure is larger, so that the welding strength between the current collecting disk structure 20 and the core structure is better, and thus the connection stability between the current collecting disk structure 20 and the core structure is better.

[0034] like Figure 3 As shown, in one embodiment, the nickel strip 100 is further provided with a first adhesive layer 120, and the aluminum strip 200 is further provided with a second adhesive layer 220. The first adhesive layer 120 and the second adhesive layer 220 are bonded to each other so that the nickel strip 100 and the aluminum strip 200 are laminated and bonded, making the connection between the nickel strip 100 and the aluminum strip 200 more convenient.

[0035] In one embodiment, the first adhesive layer 120 and the second adhesive layer 220 are both epoxy resin adhesive layers. The epoxy resin adhesive layers have high strength, so that the first adhesive layer 120 and the second adhesive layer 220 can maintain a stable connection for a long time, thereby improving the structural stability of the tab structure 10.

[0036] like Figure 2 As shown, in one embodiment, the tab structure 10 is configured to be tilted at a predetermined angle to the current collecting plate structure 20. In one embodiment, the predetermined angle is 15° to 45°. In this embodiment, the predetermined angle is 30°.

[0037] like Figures 2 to 3 As shown, in one embodiment, the length L of the tab structure 10 is 2 mm to 4 mm.

[0038] like Figure 3 As shown, in one embodiment, the nickel strip 100 and the first connecting portion 110 are integrally formed, so that the structural strength between the nickel strip 100 and the first connecting portion 110 is relatively high.

[0039] like Figure 3 As shown, in one embodiment, the aluminum strip 200 and the second connecting portion 210 are integrally formed, so that the structural strength between the aluminum strip 200 and the second connecting portion 210 is relatively high.

[0040] The present disclosure also provides a sodium ion battery, including a shell structure, a current collecting disk structure 20, a winding core structure and a tab structure 10 of any of the above embodiments, wherein the winding core structure is located within the shell structure and connected to the shell structure, the current collecting disk structure 20 is welded to the winding core structure, and the tab structure 10 is welded to the shell structure and the current collecting disk structure 20, respectively.

[0041] Compared with the prior art, the present disclosure has at least the following advantages:

[0042] Since the aluminum strip 200 is provided with a second connecting portion 210 for welding to the current collecting disk structure 20, the pole tab structure 10 is used to be welded to the current collecting disk structure 20 through the second connecting portion 210. The pole tab structure 10 includes a nickel strip 100 and an aluminum strip 200 that are stacked, so that the pole tab structure 10 is stacked, which increases the overall thickness of the pole tab structure 10 and reduces the overall length of the pole tab structure 10, so that the overall length of the pole tab structure 10 is shorter, so that the pole tab structure 10 needs to cover a smaller space area when welded to the current collecting disk structure 20, so that the welding area of ​​the current collecting disk structure 20 that can be welded to the core structure is larger, so that the number of connecting welding points 201 between the current collecting disk structure 20 and the core structure is larger, so that the welding strength between the current collecting disk structure 20 and the core structure is better, and thus the connection stability between the current collecting disk structure 20 and the core structure is better.

[0043] The above-described embodiments merely represent several implementation methods of the present disclosure. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the scope of the present disclosure, all of which fall within the scope of protection of the present disclosure. Therefore, the scope of protection of the disclosed patent shall be determined by the appended claims.

Claims

1. A tab structure for connecting to a current collecting plate structure, characterized in that: The tab structure includes a stacked nickel strip and an aluminum strip. The nickel strip is provided with a first connection portion for welding to the shell structure, and the aluminum strip is provided with a second connection portion for welding to the collecting plate structure. The first connection portion and the second connection portion are arranged diagonally.

2. The tab structure according to claim 1, characterized in that: The nickel strip is further provided with a first adhesive layer, and the aluminum strip is further provided with a second adhesive layer. The first adhesive layer and the second adhesive layer are bonded to each other, so that the nickel strip and the aluminum strip are laminated and bonded.

3. The tab structure according to claim 2, characterized in that: The first adhesive layer and the second adhesive layer are both epoxy resin adhesive layers.

4. The tab structure according to claim 1, characterized in that: The tab structure is configured to be tilted at a predetermined angle to the current collecting plate structure.

5. The tab structure according to claim 4, characterized in that: The predetermined angle is 15° to 45°.

6. The tab structure according to claim 5, characterized in that: The predetermined angle is 30°.

7. The tab structure according to claim 1, characterized in that: The length of the tab structure is 2 mm to 4 mm.

8. The tab structure according to claim 1, characterized in that: The nickel strip and the first connecting portion are an integrally formed structure.

9. The tab structure according to claim 1, characterized in that: The aluminum strip body and the second connecting portion are an integrally formed structure.

10. A sodium ion battery, characterized in that: It includes a shell structure, a current collecting disk structure, a winding core structure and a pole lug structure as described in any one of claims 1 to 9, the winding core structure is located in the shell structure and connected to the shell structure, the current collecting disk structure is welded to the winding core structure, and the pole lug structure is respectively welded to the shell structure and the current collecting disk structure.

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