Positive collector plate of cylindrical battery and cylindrical battery

Abstract

The invention discloses a cylindrical battery positive collector plate and a cylindrical battery, and belongs to the technical field of power batteries. The cylindrical battery positive collector plate comprises a collector plate body, wherein the collector plate body is provided with a central boss, a reinforcing rib, a fan ring sinking table and a hollow area; the protruding direction of the reinforcing ribs is opposite to the protruding direction of the center boss, and the protruding direction of the reinforcing ribs is consistent with the protruding direction of the fan-shaped ring sinking tables. A plurality of reinforcing ribs are arranged, and the reinforcing ribs and the fan-shaped sinking platforms are radially distributed around the central boss. Through the matching design of the characteristics of all the parts, the contact degree of the current collecting disc and the positive pole column is improved, self supporting can be achieved, no additional tool assistance is needed, the welding difficulty is reduced, and the production yield and the beat rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power batteries, and in particular to a positive electrode current collector for a cylindrical battery and a cylindrical battery. Background Art

[0002] The information disclosed in the background of the invention is only intended to enhance the understanding of the overall background of the invention and should not be necessarily regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art.

[0003] With the popularization of new energy vehicles, cylindrical batteries have attracted much attention due to their advantages such as high energy density, high compressive strength, low cost, high production efficiency and good safety performance. The positive collector plate is located inside the battery and is connected to the positive electrode of the battery cell. It is used to collect and conduct current and also plays a certain structural support role. At present, the positive collector plates of cylindrical batteries on the market are usually welded to the core in a flat sheet manner. In the actual assembly process, because the foil area of ​​the core ear is very thin and the thickness of the foil area is not completely uniform, the positive collector plate and the core will be deformed under the extrusion of the tooling. After the entire plane structure is deformed, a gap will appear on the fitting surface, which seriously affects the welding yield of the core and the collector plate. In addition, the welding of the positive collector plate and the pole requires external tooling to assist in the welding because there is no constraint. However, there are the following problems: the tooling needs to pass through the center of the core, which can easily damage the core; the welding area is limited by the tooling diameter, and the tooling is limited by the size of the center hole of the core, so it cannot meet the large overcurrent requirements; the welding auxiliary tooling can easily cause the collector plate welding surface to deform during work, and the yield is difficult to control; it poses a great challenge to the welding of the positive collector plate with the core and the pole. At the same time, cylindrical power batteries usually use the core center hole resistance welding method to weld / fix the core and the shell bottom. The small welding area of ​​resistance welding leads to poor overcurrent capacity, which can no longer meet the requirements of high-rate charging and discharging. Therefore, how to provide a cylindrical battery positive collector plate and cylindrical battery with a high degree of contact with the pole ear, low welding difficulty, high product yield and meeting the requirements of high-rate charging and discharging is an urgent problem to be solved. Summary of the invention

[0004] In view of this, the present invention provides a cylindrical battery positive electrode collector plate and a cylindrical battery. The cylindrical battery positive electrode collector plate of the present invention improves the contact degree between the collector plate and the pole ear through a special welding area structure, reduces the difficulty of welding, and improves the production yield.

[0005] In a first aspect, the present invention provides a positive electrode current collector for a cylindrical battery, comprising a current collector body, wherein the current collector body is provided with a central boss, a reinforcing rib, a fan ring sink and a hollow area;

[0006] Among them, the convex directions of the reinforcing rib and the central boss are opposite, and consistent with the convex direction of the fan ring sink; a plurality of reinforcing ribs are provided, and the reinforcing ribs and the fan ring sink are radially distributed around the central boss.

[0007] Preferably, the sinking depth of the reinforcing rib is 0.3-2 mm, the sinking depth of the fan ring sinking platform is 0.3-2 mm; and the protruding height of the center boss is 0.1-2 mm.

[0008] Preferably, the central angle of the fan ring sink is 30-90°, and the sinking area of ​​the fan ring sink includes the edge area of ​​the collecting plate body.

[0009] Preferably, the number of the reinforcing ribs is 3 to 6.

[0010] Preferably, the reinforcing rib is a rectangular reinforcing rib; the extension line of the line connecting the two wide upper center points of the rectangular reinforcing rib passes through the center of the collecting plate body.

[0011] Preferably, the rectangular reinforcing rib has a length of 10 to 23 mm and a width of 0.4 to 5 mm.

[0012] Preferably, the thickness of the reinforcing rib is 0.1-0.35 mm; the thickness of the central boss and the fan ring sink is the same as the thickness of the collecting plate body.

[0013] Preferably, an arc-shaped notch is provided at the edge of the collecting plate body corresponding to the hollow area; and a hollow area is provided between adjacent reinforcing ribs and between the reinforcing ribs and the fan ring sink.

[0014] Preferably, the shape of the hollow area is oval, oval or elliptical.

[0015] In a second aspect, the present invention provides a cylindrical battery, wherein the cylindrical battery comprises the cylindrical battery positive electrode current collecting disk.

[0016] Compared with the prior art, the present invention has achieved the following beneficial effects:

[0017] The collector body of the positive collector of the cylindrical battery provided by the present invention is provided with a central boss, a reinforcing rib, a fan ring sink and a hollow area, wherein the lifting of the middle area of ​​the central boss enables it to be interference fit with the positive pole, thereby improving the degree of fit of the contact surface, improving the welding window and improving the product's flow capacity; the present invention can not only enhance the self-rigidity of the positive collector through the design of the reinforcing ribs raised opposite to the central boss, so as to improve its anti-deformation ability, but also better fit with the winding core, effectively reducing the difficulty of welding and improving the welding yield; the design of the fan ring sink can not only provide more welding areas, but also provide sufficient margin for rework and repair welding in the production process of the battery cell; the design of the hollow area can strengthen the strength of the collector, reduce deformation, reduce deadweight, reduce costs, and facilitate the rapid circulation of gas inside the battery cell. The present invention improves the contact degree between the collector and the positive pole through the coordinated design of the features of each part, can support itself without the need for additional tooling assistance, reduces the difficulty of welding, and improves the production yield and beat. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is one of the structural schematic diagrams of the positive electrode current collector of a cylindrical battery according to an embodiment of the present invention;

[0020] Figure 2 This is the second structural schematic diagram of the positive electrode current collecting disk of a cylindrical battery according to an embodiment of the present invention;

[0021] Figure 3 1 is a schematic cross-sectional view of a reinforcing rib of a positive electrode current collector of a cylindrical battery according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of the cylindrical battery structure of an embodiment of the present invention;

[0023] In the figure, 101, current collecting plate body; 102, reinforcing ribs; 103, center boss; 104, hollow structure; 105, fan ring sink; 1, positive current collecting plate; 2, steel shell assembly; 3, winding core; 4, negative current collecting plate; 5, sealing nails; 6, negative cover plate; 7, sealing steel sheet. DETAILED DESCRIPTION

[0024] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In the specification and drawings, the same or similar reference numerals refer to the same or similar parts or components. For the sake of clarity, the drawings are not necessarily drawn to scale, and some well-known parts and structures may be omitted in the drawings.

[0025] Figure 1 and Figure 2 The present invention provides a schematic structural diagram of a positive electrode current collector of a cylindrical battery, which includes a current collector body 101, on which a center boss 103, reinforcing ribs 102, a fan-ring sink 105 and a hollow area 104 are provided; wherein the reinforcing ribs 102 and the center boss 103 have protruding directions opposite to each other, and are consistent with the protruding directions of the fan-ring sink 105; a plurality of reinforcing ribs 102 are provided, and the reinforcing ribs 102 and the fan-ring sink 105 are radially distributed around the center boss 103.

[0026] Conventional collector plates are not designed with reinforcing ribs 102, and additional tooling is required to compress them during assembly and welding. However, due to deformation during the compressing process, the welding area is partially hollow and cannot fit together as an ideal whole. It is easy to have defects such as cold welding and insufficient welding depth during welding. In the present invention, through the design of reinforcing ribs 102, during the assembly process, the tooling only needs to compress the outer area of ​​the surface of the ribs. The original flat collector plate becomes more rigid and less deformed under the action of the reinforcing ribs 102. At the same time, due to its sinking design, it can better fit with the winding core, with less welding surface gap, effectively reducing the difficulty of welding and improving the welding yield. In some embodiments of the present invention, the number of reinforcing ribs 102 is 3 to 6, and more preferably 4.

[0027] refer to Figure 3 In some embodiments of the present invention, the sinking depth c of the reinforcing rib 102 is 0.3-2 mm, and the sinking depth of the fan ring sink 105 is 0.3-2 mm; the protrusion height of the center boss 103 is 0.1-2 mm. The lifting height of the center boss 103 is interference fit with the positive pole. Conventional products are designed as integral flat sheets, which are difficult to fit with the positive pole and difficult to weld. The interference fit design in the present invention can improve the fit of the contact surface, and the adaptive self-matching improves the welding window, improves the product's current capacity, and increases the product yield. The above-mentioned sinking and protrusion of the present invention can be achieved by stamping. In addition, the center boss can increase the strength under the action of strain hardening, so the welding process of the positive collector and the coil core does not require additional tooling assistance, so the welding area is not affected by the size of the tooling (center hole); at the same time, the welding tooling is reduced, avoiding the possibility of damage to the coil core and the collector.

[0028] In some embodiments of the present invention, the central angle of the fan ring sink 105 is 30-90°, and the sinking area of ​​the fan ring sink 105 includes the edge area of ​​the collector plate body 101, such as Figure 1 and Figure 2 The fan ring sink 105 area can provide more welding areas. This area can provide sufficient design margins for products with different overcurrent requirements, and also provide sufficient margins for rework and repair welding during the cell production process, thereby improving product performance.

[0029] In some embodiments of the present invention, the reinforcing rib 102 is rectangular, such as Figure 2 As shown, the extension line of the line connecting the two wide upper center points passes through the center of the collecting plate body 101. Furthermore, the length (b) of the rectangular reinforcing rib 102 is 10-23 mm, and the width (a) is 0.4-5 mm.

[0030] In some embodiments of the present invention, the thickness d of the reinforcing rib 102 is 0.1-0.35 mm; the thickness of the central boss 103 and the fan ring sink 105 is the same as the thickness of the collecting plate body 101 .

[0031] In some embodiments of the present invention, an arc-shaped notch is provided at the edge of the collector plate body 101 corresponding to the hollow area 104. The arc-shaped notch is designed to improve the structural strength and reduce the possibility of deformation during transportation. A hollow area 104 is provided between adjacent reinforcing ribs 102 and between the reinforcing ribs 102 and the fan ring sink 105. This design makes the hollow area 104 more evenly distributed on the collector plate body 101.

[0032] In some embodiments of the present invention, the shape of the hollow area 104 is oval, oval or oval, and the size and number of the hollow area 104 are not particularly limited and can be selected according to actual needs. In conventional designs, there is no hollow area 104, which is prone to deformation during transportation, and it is difficult for the internal gas to be quickly discharged from the roll core during use. The design of the hollow area 104 of the present invention can strengthen the strength of the collecting plate, reduce deformation, reduce the difficulty of production and transportation, and reduce costs. At the same time, it forms a transmission channel for the internal gas, ensures the rapid circulation of the gas inside the battery cell, facilitates the opening of the explosion-proof valve, and ensures the safety of the battery cell.

[0033] The present invention also provides a cylindrical battery, such as Figure 4As shown, it includes a positive current collector plate 1, a steel shell assembly 2, a winding core 3, a negative current collector plate 4, a sealing nail 5, a negative cover plate 6 and a sealing steel sheet 7. The positive current collector plate used is the above-mentioned positive current collector plate. The structure of the cylindrical battery is mainly used for cylindrical batteries with larger sizes. Preferably, the diameter of the cylindrical battery is 40 to 60 mm, and the height of the cylindrical battery is 75 to 130 mm. The advantage of the battery using the above-mentioned positive current collector plate is that it reduces the difficulty of welding and improves the production yield during the production process of the cylindrical battery, while further improving the safety performance of the battery.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A positive electrode current collector for a cylindrical battery, characterized in that: It includes a collector plate body, on which a central boss, reinforcing ribs, a fan ring sink and a hollow area are arranged; Among them, the convex directions of the reinforcing rib and the central boss are opposite, and consistent with the convex direction of the fan ring sink; a plurality of reinforcing ribs are provided, and the reinforcing ribs and the fan ring sink are radially distributed around the central boss.

2. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The sinking depth of the reinforcing rib is 0.3-2 mm, the sinking depth of the fan ring sinking platform is 0.3-2 mm; the protruding height of the central boss is 0.1-2 mm.

3. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The central angle of the fan ring sink is 30-90 degrees, and the sinking area of ​​the fan ring sink includes the edge area of ​​the collecting plate body.

4. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The number of the reinforcing ribs is 3 to 6.

5. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The reinforcing rib is a rectangular reinforcing rib; the extension line of the line connecting the two wide upper center points of the rectangular reinforcing rib passes through the center of the collecting plate body.

6. The positive electrode current collector of a cylindrical battery according to claim 5, characterized in that: The rectangular reinforcing rib has a length of 10 to 23 mm and a width of 0.4 to 5 mm.

7. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The thickness of the reinforcing rib is 0.1-0.35 mm; the thickness of the central boss and the fan ring sink is the same as the thickness of the collecting plate body.

8. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: An arc-shaped notch is arranged at the edge of the collecting plate body corresponding to the hollow area; and a hollow area is arranged between adjacent reinforcing ribs and between the reinforcing ribs and the fan ring sink.

9. The positive electrode current collector of a cylindrical battery according to claim 1, characterized in that: The shape of the hollow area is oval, oval or elliptical.

10. A cylindrical battery, characterized in that: The cylindrical battery comprises the cylindrical battery positive electrode current collecting disk according to any one of claims 1 to 9.

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