Cathode collector plate of cylindrical battery

Abstract

The utility model discloses a cylindrical battery cathode collector plate which comprises a cathode collector plate body and a battery shell, a first connecting part is arranged on the cathode collector plate body, a through hole is formed in the circle center of the first connecting part, and a second connecting part is arranged in the through hole. An elastic buffering piece is installed on the end face of one end of the first connecting part, the other end of the elastic buffering piece is installed on the end face of one end of the second connecting part, a liquid guide groove is formed in the end face of the first connecting part, and an elastic buffering rib is installed on the end face of one end of the first connecting part. According to the utility model, the situation that the negative collector plate body is deformed due to welding stress generated when the negative collector plate body and the battery shell are welded can be avoided, and the deformation of the negative collector plate body is avoided when the battery roll core is subjected to thermal runaway expansion; and the situation that the battery roll core cannot well release expansion pressure due to the fact that the negative collector plate body hinders the battery roll core which expands in a thermal runaway mode is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of cylindrical battery structural parts, in particular to a negative electrode current collecting disc of a cylindrical battery. Background Art

[0002] Among existing new energy power battery types, cylindrical batteries are the mainstream in the market. Typical cylindrical battery components include a housing, cover, coil, and negative electrode collector plate. The negative electrode collector plate is a key component of cylindrical batteries, primarily providing an electrical connection between the cell's tabs and housing, and providing a channel for electrolyte flow during cell injection. The structure of the negative electrode collector plate directly impacts the performance of the electrical connection, as well as the cell's injection efficiency and wetting ability.

[0003] A search revealed patent publication number CN219917505U, which discloses a negative electrode collector tray for a battery, a battery, a battery pack, and a vehicle. The negative electrode collector tray includes a negative electrode collector tray body, one side of which has a first connection portion for connection to a cover plate of the battery pack. A reinforcement structure is provided on the side of the first connection portion facing away from the cover plate. When the cover plate and the negative electrode collector tray body are connected via the first connection portion, the reinforcement structure is provided on the side of the first connection portion facing away from the cover plate to enhance the structural strength and local thickness of the negative electrode collector tray body. This prevents connection failure of the negative electrode collector tray body when the first connection portion is connected to the cover plate, potentially impacting battery safety.

[0004] When the negative electrode current collector disc in the above technical solution is actually used, a certain welding stress will be generated when welding the negative electrode current collector disc to the battery shell. When the welding stress acts on the negative electrode current collector disc, it is easy to cause the negative electrode current collector disc to deform, affecting normal use. In addition, when the battery is in use, the battery core will expand to a certain extent. When the battery core undergoes thermal runaway expansion, the negative electrode current collector disc will hinder the thermally runaway expanding battery core, resulting in the battery core being unable to release the expansion pressure well. Therefore, a negative electrode current collector disc for a cylindrical battery is designed. Utility Model Content

[0005] In response to the defects or shortcomings of the negative electrode collector disk of cylindrical batteries, the purpose of the present invention is to provide a negative electrode collector disk for cylindrical batteries, which can not only avoid the deformation of the negative electrode collector disk body caused by the welding stress generated when welding between the negative electrode collector disk body and the battery shell, but also avoid the situation where the negative electrode collector disk body hinders the thermally runaway expansion of the battery core when the battery core undergoes thermal runaway expansion, resulting in the battery core being unable to release the expansion pressure well.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical solutions:

[0007] The utility model provides a negative electrode current collector for a cylindrical battery, comprising a negative electrode current collector body and a battery housing. The negative electrode current collector body is provided with a first connecting portion, a through hole is formed at the center of the first connecting portion, a second connecting portion is provided in the through hole, an elastic buffer is installed on the end surface of one end of the first connecting portion, and the other end of the elastic buffer is installed on the end surface of one end of the second connecting portion;

[0008] A liquid guide groove is provided on the end surface of the first connecting portion, and an elastic buffer rib is installed on the end surface of one end of the first connecting portion;

[0009] A central hole is formed at the center of the second connecting portion;

[0010] The battery housing is provided with an upper end cover and a lower end cover at both ends, and the battery housing, the upper end cover and the lower end cover are enclosed to form a receiving cavity, and the positive electrode current collecting disk, the battery coil core and the negative electrode current collecting disk body are sequentially arranged inside the receiving cavity from top to bottom.

[0011] Preferably, there is a clearance fit between the outer wall of the second connecting portion and the hole wall of the through hole.

[0012] Preferably, there are six elastic buffer members, and the six elastic buffer members are distributed in a ring array along the circumferential direction of the first connecting portion.

[0013] Preferably, a folded edge is provided on the first connecting portion, one end of the folded edge is connected to the outer edge of the first connecting portion, the other end of the folded edge extends toward the center of the first connecting portion, and the folded edge and the first connecting portion are integrated into one design.

[0014] Preferably, a stress release groove is provided on the folded peripheral edge, and the stress release groove extends along the outer edge of the folded peripheral edge toward the inner edge of the folded peripheral edge.

[0015] Preferably, there are six liquid-conducting grooves and six elastic buffer ribs, and the six liquid-conducting grooves and the six elastic buffer ribs are distributed in a ring array along the circumferential direction of the first connecting portion.

[0016] Preferably, the six liquid-conducting grooves, the six elastic buffer ribs and the six elastic buffer members are staggered in distribution.

[0017] Preferably, the first connection portion and the elastic buffer are fixed by welding, the second connection portion and the elastic buffer are fixed by welding, and the elastic buffer rib and the first connection portion are fixed by welding.

[0018] Compared with the existing technology, one or more of the above technical solutions have the following beneficial effects:

[0019] 1. In the present invention, elastic buffer ribs are provided on the first connecting portion, and the elastic buffer ribs are distributed in a ring array along the circumferential direction of the first connecting portion. When the welding stress generated by welding between the outer wall of the first connecting portion on the negative electrode current collecting disc body and the inner wall of the battery shell is transmitted to the first connecting portion, the elastic buffer ribs not only strengthen the mechanical strength of the first connecting portion, but also improve the deformation resistance of the first connecting portion when subjected to welding stress. Therefore, the present invention can avoid the deformation of the negative electrode current collecting disc body caused by the welding stress generated when welding between the negative electrode current collecting disc body and the battery shell, and enhance the mechanical strength and welding quality of the first connecting portion on the negative electrode current collecting disc body, thereby improving the stability and reliability of the battery.

[0020] 2. In the present invention, through the provision of an elastic buffer, the first connecting portion is connected to the second connecting portion through the elastic buffer, and the elastic buffer is distributed in a ring array along the circumferential direction of the first connecting portion. When the battery core undergoes thermal runaway expansion, the thermal runaway expansion of the battery core will act on the second connecting portion. The force exerted on the second connecting portion will be transmitted to the elastic buffer. The elastic buffer will produce elastic deformation to absorb the pressure generated by the expansion of the battery core, thereby avoiding the situation where the negative electrode current collecting disc body obstructs the thermally expanded battery core when the battery core undergoes thermal runaway expansion, resulting in the battery core being unable to release the expansion pressure well, thereby further improving the stability and reliability of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the negative electrode current collector body of the utility model Figure 1 .

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the negative electrode current collector body of the utility model Figure 2 .

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the first connecting part of the utility model.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the second connecting part of the utility model.

[0026] Figure 5 This is a schematic diagram of the overall split structure of the utility model Figure 1 .

[0027] Figure 6This is a schematic diagram of the overall split structure of the utility model Figure 2 .

[0028] In the picture:

[0029] 100. Negative electrode current collecting plate body;

[0030] 110, first connecting portion; 111, folded edge; 1111, stress relief groove; 112, liquid guide groove; 113, elastic buffer rib; 114, through hole;

[0031] 120. Elastic buffer;

[0032] 130. Second connecting portion; 131. Center hole;

[0033] 200, upper end cover;

[0034] 300, positive electrode current collecting plate;

[0035] 400, battery housing;

[0036] 500, battery coil;

[0037] 600. Lower end cover. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] It should be noted that the following detailed descriptions are exemplary and are 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 skilled in the art to which the present invention belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] like Figure 1-6As shown, a negative electrode current collector disc for a cylindrical battery includes a negative electrode current collector disc body 100 and a battery housing 400. A first connecting portion 110 is provided on the negative electrode current collector disc body 100. A through hole 114 is formed at the center of the first connecting portion 110. A second connecting portion 130 is provided in the through hole 114. An elastic buffer 120 is mounted on the end surface of one end of the first connecting portion 110, and the other end of the elastic buffer 120 is mounted on the end surface of one end of the second connecting portion 130. The elastic buffer 120 absorbs the pressure generated by the expansion of the battery core 500 through its own elastic deformation and rebound, so that the expansion pressure of the battery core 500 can be fully released.

[0042] A liquid guide groove 112 is formed on the end surface of the first connecting portion 110. The liquid guide groove 112 is provided to provide a channel for the electrolyte to pass through when the electrolyte is injected. An elastic buffer rib 113 is installed on the end surface of one end of the first connecting portion 110. The elastic buffer rib 113 is used to enhance the mechanical strength of the first connecting portion 110 and improve the deformation resistance of the first connecting portion 110 when subjected to welding stress.

[0043] A central hole 131 is formed at the center of the second connecting portion 130. The central hole 131 is provided to provide a passage for injecting a large flow of electrolyte.

[0044] An upper end cover 200 and a lower end cover 600 are respectively installed at both ends of the battery shell 400. The battery shell 400, the upper end cover 200 and the lower end cover 600 are internally enclosed to form a accommodating cavity, and the interior of the accommodating cavity is sequentially provided with a positive electrode current collecting disc 300, a battery coil core 500 and a negative electrode current collecting disc body 100 from top to bottom.

[0045] There is a clearance fit between the outer wall of the second connecting portion 130 and the wall of the through hole 114. Due to the clearance fit between the outer wall of the second connecting portion 130 and the wall of the through hole 114, when the second connecting portion 130 is subjected to the expansion pressure of the battery roll core 500, the force exerted on it will be directly transmitted to the elastic buffer 120.

[0046] There are six elastic buffer members 120, and the six elastic buffer members 120 are distributed in a ring array along the circumference of the first connecting portion 110. Because the six elastic buffer members 120 are distributed in a ring array along the circumference of the first connecting portion 110, they can effectively absorb the expansion pressure generated by the battery roll core 500, so that the expansion pressure generated by the battery roll core 500 is fully released.

[0047] The first connection part 110 is provided with a folded edge 111, one end of the folded edge 111 is connected to the outer edge of the first connection part 110, and the other end of the folded edge 111 extends toward the center of the first connection part 110, and the folded edge 111 and the first connection part 110 are integrated into one design. A stress release groove 1111 is provided on the folded edge 111, and the stress release groove 1111 extends along the outer edge of the folded edge 111 toward the inner edge of the folded edge 111. The setting of the folded edge 111 increases the thickness of the outer edge of the first connection part 110, and when the first connection part 110 is welded to the battery shell 400, the first connection part 110 is prevented from being welded through.

[0048] There are six liquid-conducting grooves 112 and six elastic buffer ribs 113 , and the six liquid-conducting grooves 112 and the six elastic buffer ribs 113 are distributed in a ring array along the circumferential direction of the first connecting portion 110 .

[0049] The six liquid-conducting grooves 112 , the six elastic buffer ribs 113 and the six elastic buffer members 120 are staggered in distribution.

[0050] The first connection portion 110 and the elastic buffer member 120 are fixed by welding, the second connection portion 130 and the elastic buffer member 120 are fixed by welding, and the elastic buffer rib 113 and the first connection portion 110 are fixed by welding.

[0051] In summary, when the outer wall of the first connecting portion 110 on the negative electrode current collecting disc body 100 is welded to the inner wall of the battery shell 400, the welding stress generated is transmitted to the first connecting portion 110. At this time, the elastic buffer rib 113 not only strengthens the mechanical strength of the first connecting portion 110, but also improves the deformation resistance of the first connecting portion 110 when subjected to welding stress. Therefore, the present invention can avoid the deformation of the negative electrode current collecting disc body 100 caused by the welding stress generated when welding between the negative electrode current collecting disc body 100 and the battery shell 400, and enhances the mechanical strength and welding resistance of the first connecting portion 110 on the negative electrode current collecting disc body 100. Quality, improve the stability and reliability of the battery. When the battery core 500 expands due to thermal runaway, the thermal runaway expansion of the battery core 500 will act on the second connecting part 130. The force exerted on the second connecting part 130 will be transmitted to the elastic buffer 120. The elastic buffer 120 generates elastic deformation to absorb the pressure generated by the expansion of the battery core 500, thereby avoiding the negative electrode current collecting disc body 100 hindering the thermally expanded battery core 500 when the battery core 500 expands due to thermal runaway, resulting in the battery core 500 being unable to release the expansion pressure well, thereby further improving the stability and reliability of the battery.

[0052] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A negative electrode current collector for a cylindrical battery, comprising a negative electrode current collector body (100) and a battery housing (400), characterized in that: The negative electrode current collecting disc body (100) is provided with a first connecting portion (110), a through hole (114) is opened at the center of the first connecting portion (110), a second connecting portion (130) is provided in the through hole (114), an elastic buffer (120) is installed on the end surface of one end of the first connecting portion (110), and the other end of the elastic buffer (120) is installed on the end surface of one end of the second connecting portion (130); The end surface of the first connecting portion (110) is provided with a liquid guide groove (112), and the end surface of one end of the first connecting portion (110) is provided with an elastic buffer rib (113); A central hole (131) is provided at the center of the second connecting portion (130); An upper end cover (200) and a lower end cover (600) are respectively installed at both ends of the battery housing (400), and an accommodating cavity is formed by the battery housing (400), the upper end cover (200) and the lower end cover (600), and the interior of the accommodating cavity is sequentially provided with a positive electrode current collecting disc (300), a battery winding core (500) and a negative electrode current collecting disc body (100) from top to bottom.

2. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: There is a clearance fit between the outer wall of the second connecting portion (130) and the hole wall of the through hole (114).

3. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: There are six elastic buffer members (120), and the six elastic buffer members (120) are distributed in a ring array along the circumferential direction of the first connecting portion (110).

4. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: The first connecting portion (110) is provided with a folded edge (111), one end of the folded edge (111) is connected to the outer edge of the first connecting portion (110), and the other end of the folded edge (111) extends toward the center of the first connecting portion (110), and the folded edge (111) and the first connecting portion (110) are integrated.

5. The negative electrode current collector of a cylindrical battery according to claim 4, characterized in that: A stress release groove (1111) is provided on the folded peripheral edge (111), and the stress release groove (1111) extends along the outer edge of the folded peripheral edge (111) toward the inner edge of the folded peripheral edge (111).

6. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: There are six liquid-conducting grooves (112) and six elastic buffer ribs (113), and the six liquid-conducting grooves (112) and the six elastic buffer ribs (113) are distributed in a ring array along the circumferential direction of the first connecting portion (110).

7. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: The six liquid-conducting grooves (112), the six elastic buffer ribs (113) and the six elastic buffer members (120) are distributed in a staggered manner.

8. The negative electrode current collector of a cylindrical battery according to claim 1, characterized in that: The first connecting portion (110) and the elastic buffer member (120) are fixed by welding, the second connecting portion (130) and the elastic buffer member (120) are fixed by welding, and the elastic buffer rib (113) and the first connecting portion (110) are fixed by welding.

Images