Lithium ion current collector

Abstract

The invention discloses a lithium ion current collector which comprises a current collector body, the current collector body is composed of a current collecting disc connected with a battery roll core tab and an extension handle connected with a battery cell cover plate, the current collecting disc is in a disc shape, and the extension handle is in a long strip shape; the current collecting piece is provided with a plurality of welding grooves in the circumferential direction of the current collecting disc, the welding grooves are sunken downwards, the current collecting piece is further provided with a plurality of through holes, the through holes are distributed in the current collecting disc and the extending handle, and the through holes formed in the current collecting disc are beneficial to electrolyte infiltration; the extension handle is provided with a reinforcing rib and a guide groove, so that the strength of a part of the extension handle area is enhanced. The current collector can be used for connection between the interior of a battery and a roll core tab and transmission of current from the roll core tab, is not easy to bend, does not affect welding with the tab, guides a bending position to be within a design range by utilizing strength change generated by width change when the current collector is bent, prevents the bent current collector from pressing a roll core, and reduces potential safety hazards.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a lithium ion current collector that can be used to connect the inside of a battery with a winding core tab to transmit current from the winding core tab. Background Art

[0002] The current collector is part of the battery structure, and its main function is to collect current from the winding core tab. The current collector is used in the battery process and is also a part of the battery. Its structure will have an important impact on the process and the safety performance of the battery. Existing current collectors are mostly thin sheets, which are easy to bend and deform, affecting the welding with the tab. When the current collector is bent, the bending position and fillet are difficult to control, which is easy to press the winding core and cause safety hazards. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a lithium ion current collector.

[0004] A lithium ion current collector proposed in the present invention comprises a current collector, which is composed of a current collector plate connected to a battery winding core pole ear and an extension handle connected to a battery cell cover plate, wherein the current collector plate is in a disc shape and the extension handle is in a strip shape; The current collecting sheet is provided with a plurality of welding grooves along the circumferential direction of the current collecting plate, and the welding grooves are concave downwards. The current collecting sheet is also provided with a plurality of through holes, and the through holes are distributed on the current collecting plate and the extension handle. The through holes provided on the current collecting plate are conducive to the infiltration of the electrolyte; The extension handle is provided with reinforcing ribs and guide grooves to strengthen the strength of the partial extension handle area and prevent bending outside the bending area. The guide groove is set at the bending position. Since the guide groove has low strength, the bending radius can be reduced and the space occupied by the collecting plate can be reduced.

[0005] Preferably, the battery housing is a steel shell with a grooved structure.

[0006] Preferably, the current collecting sheet is made of metal conductive material, such as aluminum or aluminum alloy.

[0007] Preferably, the current collecting plate is provided with a plurality of welding grooves along the circumferential direction of the current collecting plate, and the welding grooves are recessed downwards so that the welding positions are in full contact with the pole ears, which is beneficial to welding.

[0008] Preferably, the end of the extension handle is annular, and a through hole is provided to avoid the CID welding position, which also serves to reduce weight. The annular extension handle cooperates with the circular welding track, and the current conduction is more uniform.

[0009] Preferably, the welding grooves are arranged in a radial shape, and five welding grooves are evenly distributed, so that the current conduction is more uniform.

[0010] The beneficial effects of the present invention are: 1. The disc-shaped design of the collector increases the contact area with the tab and reduces the contact internal resistance; 2. The collector plate is provided with a welding groove, and the side wall of the groove can act as a reinforcing rib to enhance the strength of the collector plate, reduce bending during transportation and grabbing, and facilitate welding; 3. The current collecting plate is provided with multiple through holes, which is conducive to the infiltration of electrolyte; 4. The welding groove is concave downward, which increases the pressure between the collector plate and the pole ear, so that the welding position is in full contact with the pole ear, which is conducive to welding; 5. The welding grooves are evenly distributed in radiation. The closer the welding points are to the inner ring, the denser they are. The resistance of the inner ring is lower, which reduces the heat generated by the inner ring and alleviates the problem of heat generation and poor heat dissipation in the inner ring. 6. A guide groove is provided on the extension handle. The guide groove is set at the bending position. The strength change caused by the change in width is used to guide the bending position to be within the design range. Since the guide groove has a small strength, the bending fillet can be reduced, the space occupied by the collector plate can be reduced, and the bent collector plate can be prevented from pressing the winding core, thereby reducing safety hazards. 7. The extension handle is provided with reinforcing ribs to strengthen the strength of the extension handle area and prevent bending outside the bending area. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic structural diagram of a lithium ion current collector proposed in the present invention.

[0012] In the figure: 1. current collecting plate; 2. extension handle; 3. welding groove; 4. reinforcing rib; 5. guide groove; 6. through hole. DETAILED DESCRIPTION

[0013] The present invention will be further explained below in conjunction with specific embodiments. Example

[0014] refer to Figure 1 In this embodiment, a lithium ion current collector is provided, comprising a current collector, the current collector being composed of a current collector plate 1 connected to a battery winding core pole ear and an extension handle 2 connected to a battery cell cover plate, the current collector plate 1 being disc-shaped, and the extension handle 2 being strip-shaped; The current collecting sheet is provided with a plurality of welding grooves 3 along the circumferential direction of the current collecting plate 1, and the welding grooves 3 are concave downwards. The current collecting sheet is also provided with a plurality of through holes 6, and the through holes 6 are distributed on the current collecting plate 1 and the extension handle 2. The distribution positions of the through holes 6 are as follows: Figure 1 As shown, the through holes 6 provided on the current collecting plate 1 are conducive to the infiltration of the electrolyte; The extension handle 2 is provided with reinforcing ribs 4 and guide grooves 5 to strengthen the strength of the partial extension handle 2 area to prevent bending outside the bending area. The guide groove 3 is arranged at the bending position. Since the guide groove 3 is weak, the bending radius can be reduced and the space occupied by the current collecting plate 1 can be reduced. The battery shell is a steel shell with a rolling groove structure. The current collecting plate is made of metal conductive material, such as aluminum and aluminum alloy. The current collecting plate is provided with a plurality of welding grooves 3 along the circumferential direction of the current collecting plate 1. The welding grooves 3 are recessed downward so that the welding position is in full contact with the pole ear, which is conducive to welding. The end of the extension handle 2 is annular, and a through hole 6 is provided to avoid the CID welding position and also to reduce weight. The annular extension handle 2 cooperates with the circular welding trajectory, and the current conduction is more uniform. The welding grooves 3 are arranged radially, and the welding grooves 3 are evenly distributed into five lines, and the current conduction is more uniform.

[0015] In this embodiment, the current collecting disk 1 is designed in a disc shape to increase the contact area with the pole ear and reduce the contact internal resistance; the current collecting disk 1 is provided with a welding groove 3, and the side wall of the welding groove 3 can act as a reinforcing rib 4 to enhance the strength of the current collecting disk 1, reduce bending during transportation and grasping, and facilitate welding; the current collecting disk 1 is provided with a plurality of through holes 6, which are conducive to the infiltration of electrolyte; the welding groove 3 is concave downward to increase the pressure between the current collecting disk 1 and the pole ear, so that the welding position is fully in contact with the pole ear, which is conducive to welding; the welding groove 3 is evenly radiated and distributed, the closer the welding point is to the inner ring, the denser it is, the lower the resistance of the inner ring is, the heat generated by the inner ring is reduced, and the problem of heat generation and difficulty in heat dissipation of the inner ring can be alleviated; the extension handle 2 is provided with a guide groove 5, which is set at the bending position, and the strength change caused by the change in width is used to guide the bending position to be within the design range. Due to the small strength of the guide 5, the bending radius can be reduced, the space occupied by the current collecting disk 1 can be reduced, and the bending current collecting sheet can be prevented from pressing the winding core, reducing safety hazards; the extension handle 2 is provided with a reinforcing rib 4 to strengthen the strength of the extension handle 2 area to prevent bending outside the bending area.

[0016] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A lithium ion current collector, comprising a current collector, the current collector comprising a current collector plate (1) connected to a battery winding core tab and an extension handle (2) connected to a battery cell cover plate, characterized in that: The current collecting plate (1) is in the shape of a disc, the extension handle (2) is in the shape of a long strip, and the end of the extension handle (2) is in the shape of a circular ring; The current collecting sheet is provided with a plurality of welding grooves (3) along the circumferential direction of the current collecting plate (1), and the welding grooves (3) are recessed downwards; the current collecting sheet is also provided with a plurality of through holes (6), and the through holes (6) are distributed on the current collecting plate (1) and the extension handle (2); The extension handle (2) is provided with a reinforcing rib (4) and a guide groove (5), and the guide groove (5) is arranged at a bent position.

2. A lithium ion current collector according to claim 1, characterized in that: The welding grooves (3) are arranged in a radial shape, and the welding grooves (3) are evenly distributed into five.

3. A lithium ion current collector according to claim 1, characterized in that: The current collecting sheet is made of metal conductive material.

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