Collecting plate, single battery and electric device

Abstract

The utility model relates to the field of batteries, and discloses a current collecting plate, a single battery and an electric device, the current collecting plate comprises a plate body, a stretching part and a bending part, a stretching groove is formed in the end face of the plate body in a penetrating manner, the stretching part is formed by stretching in the direction away from the plate body relative to the stretching groove, and the bending part is formed by bending the joint of the stretching part and the plate body. The stretching part can be stretched or contracted on the disc body in the axial direction through the bending part, when the roll core in the single battery has upward and downward falling force under the action of gravity in the shell, the stretching part is stretched or contracted to buffer the falling force, damage to the welding position is reduced, the reliability of the welding position is effectively protected, and the service life of the battery is prolonged. And the phenomena of tearing and falling off of the tabs or internal open circuit and the like are avoided.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a current collector, a single cell, and an electrical device. Background Technology

[0002] Cylindrical batteries are highly favored in portable and home energy storage due to their advantages such as high capacity, long cycle life, and wide operating temperature range. To improve battery performance, reduce internal resistance, and achieve high-power charging and discharging, all-tab current collector welding technology has become the preferred choice for many battery manufacturers. However, in the current collector design of steel-cased cylindrical batteries, the conventional approach is to connect the current collector to the cell via through-welding, while the negative electrode of the current collector contacts the steel casing via a V-shaped spring. While this design meets the battery's usage requirements to a certain extent, after prolonged use, the V-shaped spring may experience poor contact with the steel casing due to material fatigue, deformation, or corrosion, thus affecting the battery's stability and safety. Poor contact not only reduces the battery's charging and discharging efficiency but may also lead to risks such as overheating, short circuits, and open circuits. Utility Model Content

[0003] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a current collector, a single battery cell, and an electrical device.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] This application provides:

[0006] A collector disk, the collector disk comprising:

[0007] The disc body has a through-hole stretching groove on its end face;

[0008] A stretching portion is formed by stretching the stretching groove in a direction away from the disc body;

[0009] The bending portion is formed by bending at the connection between the stretching portion and the disc body.

[0010] Furthermore, the stretching groove has a spiral shape when viewed from above.

[0011] Furthermore, the top view shape of the stretch groove is one or a combination of a polygonal spiral shape and a circular spiral shape.

[0012] Furthermore, the stretching section includes a first stretching segment and a second stretching segment, wherein the first stretching segment and the second stretching segment are parallel to each other.

[0013] Furthermore, the distance between the first stretching segment and the second stretching segment is L, which satisfies: 2mm≤L≤5mm.

[0014] Furthermore, the bending portion includes a first bending segment and a second bending segment, wherein the first bending segment is formed at the bend of the first stretching segment and the bend of the disc body, and the second bending segment is formed at the bend of the first stretching segment and the second stretching segment.

[0015] Furthermore, a first preset angle is formed between the first bending segment and the disc body, and a second preset angle is formed between the second bending segment and the first stretching segment.

[0016] Furthermore, the end face of the second stretching section has a through hole extending through it.

[0017] This application provides a single-cell battery, comprising:

[0018] Any of the above-mentioned collector disks;

[0019] A housing having a receiving cavity;

[0020] The core is placed in the receiving cavity;

[0021] A first cover plate is connected to the winding core, and the collector plate is provided between the first cover plate and the winding core.

[0022] The pole post is fixedly installed on the end face of the first cover plate away from the winding core.

[0023] A second cover plate is connected to the end of the winding core away from the first cover plate, and the collector plate is provided between the second cover plate and the winding core.

[0024] This application provides an electrical device, including the single battery described above.

[0025] This application enables the stretching part to be stretched or contracted along the axial direction on the disc body through the bending part. When the core in the single cell is subjected to upward and downward downward forces under the action of gravity in the shell, the stretching part is stretched or contracted to buffer the downward force, reduce damage to the welding position, effectively protect the reliability of the welding position, and avoid phenomena such as the tab tearing and falling off or causing internal open circuit.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This paper shows a three-dimensional structure of the collector disk in which the surface of the second stretching section of this application is planar;

[0029] Figure 2 This shows a top view of the collector plate with a planar surface in the second stretching section of this application;

[0030] Figure 3 This paper shows a three-dimensional structural diagram of the collector plate with through holes on the surface of the second stretching section of this application.

[0031] Figure 4 This shows a top view of the manifold with through holes on the surface of the second stretching section of this application;

[0032] Figure 5 This application shows that Figure 1 Or a schematic diagram of the three-sided view;

[0033] Figure 6 A schematic diagram of the structure of a single cell in the explosion state of this application is shown.

[0034] Explanation of main component symbols: 100-Collector; 110-Collector body; 111-Stretch groove; 120-Stretch section; 121-First stretch section; 122-Second stretch section; 130-Bending section; 131-First bending section; 132-Second bending section; 140-Through hole; 200-Housing shell; 300-Core; 400-First cover plate; 500-Pole post; 600-Second cover plate. Detailed Implementation

[0035] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0036] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0040] Existing cylindrical batteries typically employ a V-shaped spring and a steel shell structure. However, the V-shaped spring may experience poor contact with the steel shell due to material fatigue, uneven surface, or other reasons, thus affecting the battery's stability and safety. To address this, this application replaces the V-shaped spring with a circular disc 110, and creates a stretching groove 111 on the disc 110. The stretching part 120 is formed by bending along the trajectory of the stretching groove 111. The stretching part 120 can move closer to or further away from the disc 110, meaning it can contract. Furthermore, the surface of the connection position of the stretching part 120 is flat, increasing the connection area with the steel shell and making the connection more stable. Moreover, when the winding core 300 inside the battery moves axially, the contraction or stretching of the stretching part 120 can provide cushioning, thereby reducing damage to the welding position and preventing adverse phenomena such as tab tearing and welding position damage.

[0041] Specifically, this application provides a manifold, which includes a manifold 100 comprising a manifold body 110, a stretching portion 120, and a bending portion 130.

[0042] Specifically, a stretching groove 111 is provided through the end face of the disc body 110, the stretching part 120 is stretched about the stretching groove 111 in a direction away from the disc body 110, and the bending part 130 is bent at the connection between the stretching part 120 and the disc body 110.

[0043] See Figure 1 and Figure 2 As shown, in this embodiment, the stretching groove 111 is formed on the disc body 110 by a stamping process. The lines of the stretching groove 111 are then bent and stretched, and the stretching part 120 is stretched in a direction away from the disc body 110, thereby forming the stretching part 120 and the bending part 130.

[0044] Please continue reading. Figure 1 and Figure 2 As shown, if the stretching part 120 receives an external force, the stretching part 120 can be stretched or compressed in the direction of the disc body 110. That is, the distance between the stretching part 120 and the disc body 110 can be increased or decreased. Thus, when the core 300 in the battery moves axially in the housing 200, the stretching or compression of the stretching part 120 can compensate for the movement distance, thereby avoiding the occurrence of phenomena such as the tabs of the core 300 being torn or falling off, and improving the stability and reliability of the single battery cell.

[0045] Furthermore, since the stretching portion 120 can contract towards the disk body 110, the thickness of the current collector structure can be reduced, resulting in a smaller height. This allows for a larger space to accommodate the winding core 300 within the cell housing 200, thereby increasing the overall capacity of the cell.

[0046] In this embodiment, the disk body 110 can be made of copper, aluminum, nickel, or other metal materials and alloys. Specifically, it can be designed according to actual needs, and there are no restrictions here.

[0047] The top view of the stretching groove 111 is spiral-shaped. For example, the top view of the stretching groove 111 is one or a combination of a polygonal spiral shape and a circular spiral shape.

[0048] Please continue reading. Figure 1 and Figure 2 As shown, the stretching groove 111 is formed by stamping. For mass production, stamping is highly efficient and can improve the utilization rate of raw materials and reduce waste by arranging them reasonably. In this application, the stretching groove 111 runs through the disc 110, which can be understood as a circular plate. The stretching groove 111 has a simple structure and can meet the structural and precision requirements with a single stamping process.

[0049] For example, the stretch groove 111 can be a triangular spiral shape (not shown), a quadrilateral spiral shape (not shown), a pentagonal spiral shape (not shown), etc., and can also be a circular spiral shape, specifically, such as Figure 2 As shown, in this embodiment, the stretching groove 111 is a circular spiral shape.

[0050] In this embodiment, by opening the stretching groove 111, only part of the stretching part 120 is connected to the disc body 110. This allows the stretching part 120 to be away from the disc body 110 at a certain distance. Combined with the bending angle of the bending part 130, the surface of the stretching part 120 is made parallel, which meets the welding requirements.

[0051] The stretching portion 120 includes a first stretching segment 121 and a second stretching segment 122, wherein the first stretching segment 121 and the second stretching segment 122 are parallel to each other.

[0052] See Figure 5 As shown, in order to meet the welding requirements, in this embodiment, the second stretching section 122 is arranged in parallel with the first stretching section 121. Specifically, the first stretching section 121 and the second stretching section 122 are integrally formed, and a second bending section 132 is provided between the first stretching section 121 and the second stretching section 122. The first stretching section 121 and the second stretching section 122 are arranged in parallel through the second bending section 132.

[0053] Furthermore, the first stretching section 121, the second stretching section 122, and the disc body 110 can also be arranged in parallel to each other.

[0054] The distance between the first stretching segment 121 and the second stretching segment 122 is L, which satisfies: 2mm≤L≤5mm.

[0055] Please continue reading. Figure 5 As shown, the stretching distance L between the first stretching segment 121 and the second stretching segment 122 is between 2mm and 5mm. For example, the distance between the first stretching segment 121 and the second stretching segment 122 can be a parameter value such as 2mm, 3mm, 4mm, or 5mm. In practice, the spacing parameter can be selected and designed according to the battery of different sizes. In this embodiment, the parameter value is not limited here.

[0056] The bending portion 130 includes a first bending segment 131 and a second bending segment 132. The first bending segment 131 is formed at the bending point of the first stretching segment 121 and the disc body 110, and the second bending segment 132 is formed at the bending point of the first stretching segment 121 and the second stretching segment 122.

[0057] The first bending segment 131 forms a first preset angle with the disc body 110, and the second bending segment 132 forms a second preset angle with the first stretching segment 121.

[0058] Please continue reading. Figure 1 As shown, in order to meet the overall stretching distance of the stretching section 120, the stretching section 120 is divided into two parts: the first stretching section 121 and the second stretching section 122. Similarly, it also needs to be bent twice. Specifically, a first bending section 131 is provided at the connection between the first stretching section 121 and the disc body 110, and a second bending section 132 is provided at the connection between the first stretching section 121 and the second stretching section 122.

[0059] In this embodiment, in order to satisfy the condition that the first stretching segment 121 and the second stretching segment 122 are arranged parallel to each other, the first bending segment 131 and the second bending segment 132 are both inclined. Thus, the first bending segment 131 and the disc body 110 form a first preset angle, and the second bending segment 132 and the first stretching segment 121 form a second preset angle. Through the relationship between the first preset angle and the second preset angle, the first stretching segment 121 and the second stretching segment 122 are made to be parallel to each other. The specific values ​​of the first preset angle and the second preset angle are not limited here, as long as the first stretching segment 121 and the second stretching segment 122 are arranged parallel to each other.

[0060] See Figure 3 and Figure 4 As shown, in this embodiment, in order to meet the connection between the collector plate 100 and the pole post 500, a through hole 140 is provided on the end face of the second stretching section 122. During installation, the pole post 500 is riveted and fixedly connected to the through hole 140, thereby meeting the installation requirements through the through hole 140.

[0061] This application also provides a single-cell battery, which includes the aforementioned current collector 100, housing 200, core 300, first cover plate 400, terminal post 500, and second cover plate 600.

[0062] See Figure 6 As shown, the housing 200 has a receiving cavity, the core 300 is placed in the receiving cavity, the first cover plate 400 is connected to the core 300, and the current collector 100 is disposed between the first cover plate 400 and the core 300. The pole post 500 is fixedly installed on the end face of the first cover plate 400 away from the core 300. The second cover plate 600 is connected to the end of the core 300 away from the first cover plate 400, and the current collector 100 is disposed between the second cover plate 600 and the core 300.

[0063] For details, please continue reading. Figure 6 As shown, a through hole 140 is opened in the second stretching section 122 of the collector plate 100 provided between the first cover plate 400 and the core 300. Then, the surface of the second stretching section 122 in the collector plate 100 provided between the core 300 and the second cover plate 600 is a plane, that is, no through hole 140 is opened on the second stretching section 122 at this position.

[0064] Furthermore, before welding, the positive and negative tabs of the core 300 need to be flattened. Specifically, the tab at the end of the core 300 near the first cover plate 400 is the positive tab, i.e., the positive end, and the tab at the end of the core 300 near the second cover plate 600 is the negative tab, i.e., the negative end.

[0065] In this embodiment, at the positive end, a through hole 140 is opened in the second stretching section 122 of the current collector 100 at the position of the first cover plate 400. Specifically, the through hole 140 is riveted and fixed to the pole post 500. Furthermore, the plate body 110 is welded to the flattened positive electrode tab, and then the second stretching section 122 is welded to the first cover plate 400.

[0066] In this embodiment, at the negative terminal, the second stretching section 122 of the collector plate 100 at the second cover plate 600 position does not have a through hole 140, that is, the surface of the second stretching section 122 is a plane. The plate body 110 at this position is welded to the flattened negative electrode ear, and the second stretching section 122 is welded and fixed to the second cover plate 600.

[0067] In this embodiment, the first cover plate 400 is welded to the housing 200, and the second cover plate 600 is welded to the housing 200 to form a cylindrical single cell.

[0068] This application also provides an electrical device, including the single battery described above.

[0069] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A collector disk, characterized in that, The collector panel (100) includes: The disc body (110) has a through-hole stretching groove (111) on its end face; A stretching portion (120) is formed by stretching the stretching groove (111) in a direction away from the disc body (110); A bending portion (130) is formed by bending at the connection between the stretching portion (120) and the disc body (110).

2. The collector disk according to claim 1, characterized in that, The stretching groove (111) has a spiral shape when viewed from above.

3. The collector disk according to claim 1 or 2, characterized in that, The top view of the stretching groove (111) is either a polygonal spiral shape or a circular spiral shape or a combination thereof.

4. The collector disk according to claim 1, characterized in that, The stretching section (120) includes a first stretching segment (121) and a second stretching segment (122), wherein the first stretching segment (121) and the second stretching segment (122) are parallel to each other.

5. The collector disk according to claim 4, characterized in that, The distance between the first stretching segment (121) and the second stretching segment (122) is L, which satisfies: 2mm≤L≤5mm.

6. The collector disk according to claim 4, characterized in that, The bending portion (130) includes a first bending segment (131) and a second bending segment (132). The first bending segment (131) is formed at the bend between the first stretching segment (121) and the disc body (110), and the second bending segment (132) is formed at the bend between the first stretching segment (121) and the second stretching segment (122).

7. The collector disk according to claim 6, characterized in that, The first bending segment (131) forms a first preset angle with the disc body (110), and the second bending segment (132) forms a second preset angle with the first stretching segment (121).

8. The collector disk according to claim 4, characterized in that, The end face of the second stretching section (122) is provided with a through hole (140) that penetrates through it.

9. A single-cell battery, characterized in that, include: The collector plate (100) according to any one of claims 1 to 8; A housing (200) having a receiving cavity; A core (300) is placed in the receiving cavity; A first cover plate (400) is connected to the core (300), and a collector plate (100) is provided between the first cover plate (400) and the core (300); A pole post (500) is fixedly installed on the end face of the first cover plate (400) in the direction away from the core (300); The second cover plate (600) is connected to the end of the core (300) away from the first cover plate (400), and the collector plate (100) is provided between the second cover plate (600) and the core (300).

10. An electrical device, characterized in that, Includes the single-cell battery as described in claim 9.

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