Collecting plate structure and lithium battery

Abstract

The utility model belongs to the technical field of current collecting plates, particularly relates to a current collecting plate structure and a lithium battery, and aims to solve the problems that in the prior art, when the diameter of the battery is gradually reduced, the width of a positive current collector is narrowed along with the diameter, the included angle of a second welding seam 2 mentioned in the patent is gradually reduced, and the current collecting effect is reduced; in order to solve the problem that a second welding seam 3 is gradually shortened and loses a fixing effect, the utility model provides the following scheme: the current collecting plate comprises a current collecting plate main body; the collector plate structure further comprises an extension handle and a bonding wire track. The left side and the right side of the extension handle are each provided with a first bending line and a second bending line. According to the utility model, the collector plate main body adopts a triangular and extension handle structure, when the collector plate main body is welded with the end surface of a roll core, the welding strength can be ensured, and meanwhile, the triangular welding shape can better gather batteries, reduce the internal resistance of the batteries and improve the rate capability of the batteries.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technology field of current collecting disc especially relates to a current collecting disc structure and lithium battery. BACKGROUND

[0002] In prior art, the current collecting disc is also a part of cylindrical battery, and the battery internal resistance is greatly reduced by increasing the tab conducting area and the connecting area of the connecting part and shortening the tab conducting distance through the structural design of the current collecting disc.

[0003] In the positive current collector structure mentioned in the publication number CN214336868U, it is found in actual application that when the diameter of the battery gradually decreases, the width of the positive current collector gradually narrows along with the diameter, at this time, the second weld 2 mentioned in the patent gradually decreases the included angle, reduces the current collecting effect, and at the same time, the second weld 3 gradually shortens and loses the fixing effect.

[0004] Therefore, the current collecting disc structure and lithium battery are provided to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of current collecting disc structure and lithium battery, to solve the shortcoming that when the diameter of battery gradually decreases in prior art, positive current collector width gradually narrows along with the diameter, at this time, the second weld 2 mentioned in the patent gradually decreases the included angle, reduces the current collecting effect;At the same time, the second weld 3 gradually shortens and loses the fixing effect.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] A kind of current collecting disc structure, including current collecting disc main body;

[0008] The current collecting disc structure further includes:

[0009] Extension handle and welding line track are set;

[0010] The left and right sides of the extension handle are each equipped with a first bending line and a second bending line;

[0011] A first recess is provided in the current collecting disc main body, and a second recess is provided in the extension handle;

[0012] The material of the current collecting disc main body is pure aluminum;

[0013] A central hole is provided in the current collecting disc main body, and the diameter of the central hole is greater than the hole diameter of the roll core.

[0014] As a preferred scheme of the utility model, the thickness of the current collecting disc main body is 0.1-0.5mm.

[0015] As a preferred scheme of the utility model, the current collector plate main body is triangular structure, and the welding area is three square areas, which are separated by 120 degrees in the circumferential direction.

[0016] As a preferred scheme of the utility model, the width between the extension handle and the square area below the current collector plate main body is 5-12mm.

[0017] As a preferred scheme of the utility model, the size of the second groove is located between the first bending line and the second bending line, which can strengthen the strength of the extension handle and make the extension handle bend at the predetermined bending line.

[0018] As a preferred scheme of the utility model, the opposite side of the first groove is a boss structure, which can better match the positive pole plane of the winding core and ensure the welding stability.

[0019] As a preferred scheme of the utility model, the welding line track is one of sinusoidal wave shape and straight line shape.

[0020] As a preferred scheme of the utility model, the current collector plate main body is provided with a first chamfer, which is a foolproof design and is mainly used for equipment loading positioning, so that the front and back of the current collector plate main body can be distinguished, and the extension handle is provided with a second chamfer, which is convenient for the next process and can be smoothly sleeved into the insulating sheet.

[0021] A lithium battery comprising the current collector plate structure. Advantages

[0022] In the utility model, the current collector plate main body adopts a triangular extension handle structure, which can ensure the welding strength when welding with the winding core end face, and the triangular welding shape can better collect the battery, reduce the internal resistance of the battery and improve the rate performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 It is a three-dimensional structure of the utility model;

[0024] Fig. 2 It is a front view of the utility model;

[0025] Fig. 3 It is a schematic view of the positive current collector structure and the welding line track in the authorized publication number CN214336868U of the comparative example 1 of the utility model.

[0026] In the figure: 1, current collector plate main body; 2, first chamfer; 3, welding line track; 4, center hole; 5, first groove; 6, second groove; 7, extension handle; 8, second chamfer; 9, first bending line; 10, second bending line. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be apparently and completely described in connection with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Embodiment

[0028] Referring to Figs. 1-3 A current collecting plate structure comprises a current collecting plate body 1.

[0029] The current collecting plate structure further comprises:

[0030] The extension handle 7 and the wire bonding track 3;

[0031] The extension handle 7 is provided with a first bending line 9 and a second bending line 10 on the left and right sides thereof;

[0032] The current collecting plate body 1 is provided with a first recess 5, and the extension handle 7 is provided with a second recess 6;

[0033] The material of the current collecting plate body 1 is pure aluminum;

[0034] The current collecting plate body 1 is provided with a center hole 4, and the diameter of the center hole 4 is greater than the hole diameter of the winding core.

[0035] As a preferred scheme of the utility model, the thickness of the current collecting plate body 1 is 0.1-0.5mm.

[0036] As a preferred scheme of the utility model, the current collecting plate body 1 is in a triangular structure, the welding area is three square areas, and the square areas are separated by 120° in the circumferential direction.

[0037] As a preferred scheme of the utility model, the width between the extension handle 7 and the square area below the current collecting plate body 1 is 5-12mm.

[0038] As a preferred scheme of the utility model, the size of the second recess 6 is located between the first bending line 9 and the second bending line 10, and the second recess 6 serves to strengthen the strength of the extension handle 7, so that the extension handle 7 can be bent at the predetermined bending line.

[0039] As a preferred scheme of the utility model, the opposite side of the first recess 5 is in a boss structure, so that the first recess 5 can better adhere to the positive pole plane of the winding core, and the welding stability is ensured.

[0040] As a preferred scheme of the utility model, the wire bonding track 3 is in one of a sine wave shape and a straight line shape.

[0041] As a preferred scheme of the utility model, the current collector plate main body 1 is internally provided with a first chamfer 2, which is a foolproof design, and is mainly used for positioning equipment loading, and can distinguish the front and back of the current collector plate main body 1, and the extension handle 7 is internally provided with a second chamfer 8, so as to facilitate the next process and smoothly fit into the insulating sheet.

[0042] A lithium battery comprising the current collector plate structure.

[0043] The working principle of the utility model is as follows: after the core is fed, the first groove 5 is outward, the back surface of the first groove 5 is in contact with the core;

[0044] Meanwhile, the center hole 4 is concentric with the hole of the core;

[0045] The tool clamp is pressed around the three first grooves 5, so that the back surface of the first groove 5 is in good contact with the core;

[0046] Then, the current collector plate main body 1 and the core end face are welded along the ring track 3 through laser welding;

[0047] And the extension handle 7 is bent 90° along the second bending line 10;

[0048] The core is rubber-coated, and the punched insulating sheet is fitted into the surface of the current collector plate main body 1 from the second chamfer 8;

[0049] The core is put into the shell;

[0050] The negative electrode point is welded;

[0051] The groove is rolled;

[0052] The liquid is injected, the cap is welded, the extension handle 7 is bent 180° along the first bending line 9, so that the cap is assembled into the shell, and the seal is performed;

[0053] The battery is oiled, shrunk, and coded;

[0054] The battery is subjected to formation, capacity distribution and other processes to complete the battery production.

[0055] Comparative example 1

[0056] Taking a 26650 small cylindrical battery as an example, the battery diameter is 26mm, and through design calculation, the thickness of the current collector plate is 0.3mm, and the width of the extension handle is 9mm; taking this as an example, the utility model and the battery with the positive current collector structure in the authorized number CN214336868U are compared.

[0057] 1. Core production: through homogenizing, coating, rolling, cutting, winding and rubbing processes, the core is obtained;

[0058] 2. Welding of negative electrode current collector sheet and core negative electrode end face;

[0059] 3. Welding of the positive current collector disc and the positive end face of the winding core;

[0060] 4. Bending the extended handle by 90°;

[0061] 5. Rubber coating of the winding core and placing of the insulating sheet;

[0062] 6. Putting the winding core into the shell;

[0063] 7. Welding of the negative point bottom;

[0064] 8. Rolling of the groove;

[0065] 9. Liquid injection, cap welding and sealing;

[0066] 10. Oil coating, heat shrinkage and code spraying of the battery;

[0067] The battery is subjected to formation, capacity distribution and other processes to complete the battery production.

[0068] The battery of the comparative example has the same production process as that of the example, and the positive current collector disc is produced by the method in the patent; as shown in the figure, the shape is a sheet material, and the wire welding track is shown in the figure. After welding of the positive current collector disc and the winding core, the tensile test is compared. After the battery is produced, the internal resistance is compared. After the battery is produced, the charge and discharge are compared. The comparison results are as follows:

[0069]

[0070] From the above table, it can be seen that the performance of the example is better than that of the comparative example.

[0071] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A collector disk structure, characterized in that, Including the main body of the collector plate (1); The collector plate structure also includes: Extension handle (7) and wire bonding trajectory (3); The extension handle (7) is provided with a first bending line (9) and a second bending line (10) on both the left and right sides. The main body (1) of the collector plate is provided with a first groove (5), and the extension handle (7) is provided with a second groove (6). The main body (1) of the collector plate is made of pure aluminum; The main body (1) of the collector plate is provided with a central hole (4).

2. The collector disk structure according to claim 1, characterized in that, The thickness of the main body (1) of the collector plate is 0.1~0.5mm.

3. The collector disk structure according to claim 1, characterized in that, The main body (1) of the collector plate is a triangular structure, and the welding area consists of three square areas, which are 120° apart in the circumferential direction.

4. The collector disk structure according to claim 1, characterized in that, The width between the extension handle (7) and the square area below the main body (1) of the collector plate is 5-12mm.

5. A collector disk structure according to claim 1, characterized in that, The length of the second groove (6) is located between the first bend line (9) and the second bend line (10).

6. The collector disk structure according to claim 1, characterized in that, The opposite side of the first groove (5) is a boss structure.

7. The current collector structure according to claim 1, characterized in that, The welding line trajectory (3) is either a sine wave shape or a straight line shape.

8. The collector disk structure according to claim 1, characterized in that, The main body (1) of the collector plate is provided with a first chamfer (2), and the extension handle (7) is provided with a second chamfer (8).

9. A lithium battery, characterized in that, The collector disk structure includes any one of claims 1-8.

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