Multilayer current collector tab structure

Abstract

The utility model discloses a multi-layer current collector tab structure, which relates to the technical field of batteries, and comprises a current collector, the current collector comprises a plurality of electrode plates, the end parts of the plurality of electrode plates are provided with metal sheets, the metal sheets are provided with outer side keys, and the outer side keys are connected with the outer walls of the adjacent electrode plates. And by arranging a multi-layer current collector connection mode, the operation of transfer welding is avoided, and the whole cell processing technology is more simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely is a kind of multilayer current collector tab structure. BACKGROUND

[0002] New energy lithium battery has been developed rapidly in recent years.A kind of material used in new energy battery is multilayer current collector.The current collector is composed of multilayer structure, generally PET, PP and other high molecular materials in the middle, and aluminum layer or copper layer is arranged on both sides respectively.It is used as a current collector inside the battery.Due to the multilayer current collector in the middle is PET, PP, PI and other high molecular materials as support layer, not conductive, so the current collector needs to be transferred during use.Welding is used in conventional technology to weld aluminum foil or copper foil on both sides of the multilayer current collector, and parallel leads out the current on both sides.

[0003] At present, the multilayer current collector tab structure needs to introduce a new processing procedure in the process route of the battery cell, and a transfer welding device is generally arranged after rolling, which occupies an area of about 6 meters by 2 meters, increases the processing procedure and reduces the output rate, wherein the transfer welding process introduces two layers of traditional aluminum foil and copper foil, which greatly increases the thickness of the tab position, increases the processing difficulty and increases the weight of the battery cell. SUMMARY

[0004] The utility model aims at providing a kind of multilayer current collector tab structure to solve the problem of increasing processing procedure of current multilayer current collector tab structure in prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of multilayer current collector tab structure, including current collector, the current collector includes a plurality of electrode sheets, a plurality of electrode sheet end is provided with metal sheet, the metal sheet is provided with outer key, the outer key is connected with the electrode sheet outer wall of similar.

[0006] Preferably, the current collector is provided with a battery body away from the metal sheet, the battery body includes a battery cell shell, the battery cell shell is provided with a battery cell wound by electrode sheet inside, the battery cell is provided with positive plate and negative plate on both sides.

[0007] Preferably, the battery body is provided with a shell outside, the shell includes two mirror image symmetrical shell plates, the two shell plates are provided with mounting groove on the side facing each other, the mounting groove is provided with clamping groove on one side, the clamping groove inner wall is fixedly connected with insulating sealing body, the two shell plates are provided with fixedly connected fixing assembly.

[0008] Preferably, the left side shell plate is fixedly connected with a frame-shaped rod at the corresponding position of the mounting groove, and the right side shell plate is provided with a frame-shaped groove in plug connection with the frame-shaped rod at the corresponding position of the mounting groove.

[0009] Preferably, the fixing assembly comprises four bolts, the right side shell plate is provided with four threaded grooves at one side of the frame-shaped groove, the four threaded grooves are respectively located at four corners of the shell plate, the threaded connection between the movable end of the bolt and the threaded groove, and the fixing port is provided at the corresponding position of each threaded groove on the left side shell plate.

[0010] Preferably, the fixing port is formed with a hidden groove away from the groove opening of the threaded groove, the nut fixedly connected to the end of the bolt is located in the cavity of the hidden groove, and the cross groove is formed in the side of the nut away from the bolt.

[0011] Compared with the prior art, the utility model has the advantages that:

[0012] 1、The application avoids the operation of adapter welding by setting a multi-layer current collector connection mode, so that the whole battery cell processing technology is more simplified.

[0013] 2、The application solves the problem that the outermost surface of the multi-layer current collector cannot be connected by setting an outer key on the metal sheet.

[0014] 3、The application can reduce the number of tabs and the weight of the battery cell by this process.

[0015] 4、The application sets two shell plates, so that only two shell plates need to be closed, and the battery body is placed between the two shell plates, the device is simple in structure and convenient to use, and the convenience of disassembly and assembly of the multi-layer current collector tab structure is improved.

[0016] 5、The application sets an insulating sealing body at the clamping groove and a sealing ring between the two shell plates, so that the sealing property of the multi-layer current collector tab structure as a whole is improved, especially at the joint between the shell plate and the electrode sheet. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a three-dimensional view of the assembly of the multi-layer current collector tab structure as a whole.

[0018] Figure 2 It is a three-dimensional view of the assembly of the multi-layer current collector tab structure as a whole.

[0019] Figure 3 It is a three-dimensional view of the shell plate of the multi-layer current collector tab structure.

[0020] Figure 4 This is a schematic diagram of the staggered structure of the multilayer current collector tabs in the multilayer current collector tab structure of this utility model.

[0021] Figure 5 This is a schematic diagram of the battery body and metal sheet mating structure of a multilayer current collector tab structure according to this utility model.

[0022] Figure 6 This is a top view schematic diagram of a battery cell with a multilayer current collector tab structure according to this utility model.

[0023] The following are the labels in the diagram: 1. Battery body; 101. Cell casing; 102. Positive electrode plate; 103. Negative electrode plate; 2. Current collector; 3. Shell plate; 4. Mounting groove; 5. Snap-fit ​​groove; 6. Insulating seal; 7. Fixing assembly; 701. Bolt; 702. Threaded groove; 703. Fixing port; 8. Frame rod; 9. Sealing ring; 10. Hidden groove; 11. External key; 12. Metal sheet; 13. Frame groove. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example: Figure 1 - Figure 6 As shown, this utility model provides a technical solution for a multi-layer current collector electrode structure, including a current collector 2, the current collector 2 including multiple electrode plates, the ends of the multiple electrode plates are provided with metal plates 12, the metal plates 12 are provided with outer keys 11, and the outer keys 11 are connected to the outer walls of adjacent electrode plates.

[0026] The rightmost electrode plate is integrally connected to the metal plate 12 on its right side. The lower half of the second electrode plate is connected to the right side of the rightmost electrode plate. The upper half of the second electrode plate is connected to the metal plate 12. Similarly, the lower right half of the third electrode plate is connected to the left side of the second electrode plate, and the upper right side of the third electrode plate is connected to the metal plate 12. The right side of the leftmost electrode plate is connected to the metal plate 12, and the outer key 11 is connected to the left side of the leftmost electrode plate. This ensures that both sides of all current collectors 2 are connected to the metal plate 12.

[0027] like Figure 6As shown, the current collector 2 is provided with a battery body 1 away from one end of the metal sheet 12, the battery body 1 includes a cell shell 101, the cell shell 101 is internally provided with a cell wound by electrode sheets, and the cell is provided with a positive electrode sheet 102 and a negative electrode sheet 103 on both sides of the cell symmetrically, the positive electrode sheet 102 is a positive electrode tab connection, and the negative electrode sheet 103 is a negative electrode tab connection;

[0028] This mode can reduce the number of electrode sheets, and one electrode sheet position can realize the current output of the positive electrode sheet 102 or the negative electrode sheet 103. In this way, at least two tab positions are avoided, and the problem that the current of the outermost layer of the multi-layer electrode sheet cannot be output is solved;

[0029] The blank width of the electrode sheet does not need to be designed differently. The metal sheet 12 of the cell is arranged at the middle position. The distance from the outermost tab to the metal sheet 12 is long, and the extended tab is short. The distance from the innermost tab to the metal sheet 12 is short, and the extended tab is long. In this way, the different positions of the metal sheet 12 are utilized to realize the staggered structure of the gil tab.

[0030] The entire cell is wound by electrode sheets, and the positive electrode sheet 102 and the negative electrode sheet 103 can be designed at two symmetrical positions respectively. The connection mode is the same as the above-mentioned scheme. This mode can reduce the number of tabs, and one tab position can realize the current output of the positive electrode or the negative electrode. In the traditional tab setting, at least two tab positions are needed, so the problem that the current of the outermost layer of the multi-layer current collector 2 cannot be output is solved.

[0031] As shown in Figure 1 - Figure 3 As shown, the battery body 1 is sleeved with a shell outside, the shell includes two mirror-symmetrically arranged shell plates 3, the facing sides of the two shell plates 3 are both provided with a mounting groove 4, one side of the mounting groove 4 is provided with a clamping groove 5, the inner wall of the clamping groove 5 is fixedly connected with an insulating sealing body 6, and the two shell plates 3 are provided with a fixedly connected fixing assembly 7;

[0032] Put the battery body 1 into the cavity of the mounting groove 4 between the two shell plates 3, and combine the two shell plates 3, then fix the two shell plates 3 by the fixing assembly 7, and the installation is completed; the insulating sealing body 6 is made of insulating soft plastic material, the thickness of the two insulating sealing bodies 6 combined is greater than the width of the combined cavities of the two clamping grooves 5, so that when the shell plates 3 are combined, the two insulating sealing bodies 6 will clamp the electrode sheets and be slightly deformed by being extruded, so as to increase the sealing performance at the clamping groove 5.

[0033] As shown in Figure 2 and Figure 3 As shown, the left shell plate 3 is fixedly connected with a frame-shaped rod 8 at the corresponding position of the mounting groove 4, the right shell plate 3 is provided with a frame-shaped groove 13 at the corresponding position of the mounting groove 4, the frame-shaped groove 13 is in plug connection with the frame-shaped rod 8, and the frame-shaped groove 13 is provided with a sealing ring 9;

[0034] The frame-shaped rod 8 is connected with the frame-shaped slot 13 in a plug-in manner, and the sealing ring 9 is pressed by the inner wall of the frame-shaped rod 8 and the frame-shaped slot 13, so as to increase the sealing property between the two shell plates 3.

[0035] As shown in Figure 2 The fixing assembly 7 comprises four bolts 701, four threaded grooves 702 are formed at one side of the frame-shaped slot 13 of the right shell plate 3, the four threaded grooves 702 are respectively located at four corners of the shell plate 3, the threaded connection between the movable end of the bolt 701 and the threaded groove 702, and the fixing hole 703 is formed at the corresponding position of the left shell plate 3 relative to each threaded groove 702, and the bolt 701 is connected with the fixing hole 703 in a plug-in manner.

[0036] The two shell plates 3 are fixed by the bolts 701.

[0037] As shown in Figure 1 and Figure 2 The hidden groove 10 is formed at the groove opening of the fixing hole 703 away from the threaded groove 702, the nut fixedly connected with the end of the bolt 701 is located in the cavity of the hidden groove 10, and the cross groove is formed at the side of the nut away from the bolt 701.

[0038] It is apparent for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, but rather can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-restrictive in any respect, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and range of equivalent elements of the claims are intended to be embraced in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A multi-layer current collector tab structure comprising a current collector (2), characterized in that: The current collector (2) comprises a plurality of electrode sheets, and metal sheets (12) are arranged at the ends of the plurality of electrode sheets, wherein the metal sheets (12) are provided with outer keys (11) connected with the outer walls of the adjacent electrode sheets.

2. The multi-layer current collector tab structure of claim 1, wherein: The current collector (2) is provided with a battery body (1) at one end away from the metal sheets (12), and the battery body (1) comprises an electrode core shell (101) provided with an electrode core wound by the electrode sheets, and the electrode core is provided with a positive electrode sheet (102) and a negative electrode sheet (103) on the two symmetrical sides.

3. The multi-layer current collector tab structure of claim 2, wherein: The battery body (1) is provided with a shell outside, and the shell comprises two mirror-symmetrically arranged shell plates (3), the two shell plates (3) are each provided with a mounting groove (4) on the side facing each other, the mounting groove (4) is provided with a clamping groove (5) on one side, the clamping groove (5) is fixedly connected with an insulating sealing body (6) on the inner wall, and the two shell plates (3) are provided with a fixedly connected fixing assembly (7).

4. The multi-layer current collector tab structure of claim 3, wherein: The left shell plate (3) is fixedly connected with a frame-shaped rod (8) at the corresponding position of the mounting groove (4), the right shell plate (3) is provided with a frame-shaped groove (13) at the corresponding position of the mounting groove (4) and is insertedly connected with the frame-shaped rod (8), and the frame-shaped groove (13) is provided with a sealing ring (9) in the cavity.

5. The multi-layer current collector tab structure of claim 4, wherein: The fixing assembly (7) comprises four bolts (701), the right shell plate (3) is provided with four threaded grooves (702) at one side of the frame-shaped groove (13), the four threaded grooves (702) are respectively arranged at the four corners of the shell plate (3), the bolt (701) is threadedly connected with the threaded groove (702) at the movable end, and the left shell plate (3) is provided with a fixing opening (703) at the corresponding position of each threaded groove (702).

6. The multi-layer current collector tab structure of claim 5, wherein: The fixing opening (703) is formed with a hidden groove (10) at the groove opening away from the threaded groove (702), and the nut fixedly connected with the end of the bolt (701) is arranged in the cavity of the hidden groove (10).

Images