High-magnification cylindrical battery cover plate assembly and battery

Abstract

The utility model provides a high magnification cylindrical battery cover plate assembly and battery, relates to battery technical field, high magnification cylindrical battery cover plate assembly, including confluence disc, lower plastic cement, upper cover plate, negative pole and upper plastic cement, the confluence disc whole is disc shape, the confluence disc includes light and thin disc body and thickened disc body, the thickness of the thickened disc body is larger than that of the light and thin disc body, the thickened disc body is arranged in the radial direction of the disc, the convergence disc is arranged to be composed of the light and thin disc body and the thickened disc body, the light and thin disc body guarantees the welding efficiency and the welding quality when the convergence disc is welded with a roll core tab, and in the subsequent shell entering process, the light and thin disc body is easy to bend and low in welding difficulty; therefore, the production efficiency and the production yield are improved. The flow passing area of the thickened disc body is large, the large-multiplying-power flow passing capacity is guaranteed, the problem that the internal resistance is large due to the narrow and long design of a traditional confluence disc is solved, meanwhile, the thickened disc body plays a role of a reinforcing rib, and welding deformation of the light and thin disc body is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a high-rate cylindrical battery cover assembly and a battery. Background Art

[0002] High-rate cylindrical batteries have the ability of high-current charging and discharging, and are particularly applied to scenarios that require instantaneous or continuous high-power charging and discharging, such as vehicle start-stop batteries, unmanned aerial vehicles, and power tools.

[0003] The cover assembly in the battery is used to connect the internal winding core, and is welded to the shell to play a role in sealing protection and port connection. The existing cover assembly mainly consists of a pole column, a top cover sheet, a sealing ring, a current collector plate, a lower plastic, an upper plastic, and a terminal.

[0004] The current collector plate is integrally connected to the top cover and the terminal through a riveting process. The narrow and long design of the current collector plate results in a large internal resistance. Especially in high-rate applications, this high-internal-resistance current collector plate design will cause serious heat generation, obvious temperature rise of the battery, thus affecting the power performance of the battery core, and having potential safety problem risks.

[0005] At the same time, for the current collector plate used in high-rate current charging and discharging applications, due to the high requirement for overcurrent capacity, the thickness and width of the current collector plate are generally designed to be large. This thickening and widening conventional design causes difficulties in the subsequent assembly and manufacturing process of the battery. During the subsequent process of inserting into the shell, it is difficult to bend the thick current collector plate even if it is locally thinned, and even if the welding area is thinned, the welding difficulty increases significantly, resulting in poor manufacturability, low production efficiency and low production yield. In view of the above defects, this application is proposed. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a high-rate cylindrical battery cover assembly and a battery, which solve the temperature rise effect caused by too large internal resistance of the existing structural parts and large ohmic heat generation, and at the same time optimize the design to improve the manufacturability of the battery core assembly, and improve the production efficiency and yield.

[0007] To solve the above problems, the utility model provides a high-rate cylindrical battery cover assembly, including a current collector plate, a lower plastic, an upper cover, a negative pole column and an upper plastic. The current collector plate is integrally in a disc shape. The current collector plate includes a thin and light plate body and a thickened plate body. The thickness of the thickened plate body is greater than that of the thin and light plate body. The thickened plate body is arranged along the radial direction of the disc. A pole column connecting collar is arranged on the thickened plate body. The thickened plate body ensures the high-rate overcurrent capacity and plays a role of a reinforcing rib.

[0008] According to an embodiment of the utility model, the thickened plate body is arranged in a cross shape.

[0009] According to an embodiment of the utility model, a support structure is arranged at the thickened plate body, and the support structure is used to support the upper cover.

[0010] According to an embodiment of the present utility model, the support structure is formed by bending a partially thickened disk body.

[0011] According to an embodiment of the present utility model, a vertical step structure is provided on the upper plastic.

[0012] According to an embodiment of the present utility model, a plurality of groove structures are provided on the outer circumferential surface of the negative electrode post.

[0013] According to an embodiment of the present utility model, the electrode post connecting collar is composed of a plurality of groups of fan-shaped structures.

[0014] According to an embodiment of the present utility model, a plurality of ventilation holes are provided on the current collecting plate.

[0015] According to an embodiment of the present utility model, the thickened disk body and the thin disk body are of an integral structure or a split structure.

[0016] A battery is provided with the above-mentioned high-rate cylindrical battery cover plate assembly.

[0017] The beneficial effect of the present utility model is that by setting the current collecting plate to be composed of a thin disk body and a thickened disk body, the thin disk body ensures the welding efficiency and welding quality when welding with the tab of the wound core. During the subsequent process of inserting into the shell, the thin disk body is easy to bend, and the welding difficulty is low, thereby improving the production efficiency and production yield. The thickened disk body has a large current-carrying area, ensuring the large-rate current-carrying capacity, solving the problem of large internal resistance caused by the narrow and long design of the traditional current collecting plate. At the same time, the thickened disk body acts as a reinforcing rib to prevent the welding deformation of the thin disk body. Brief Description of the Drawings

[0018] The present utility model will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 is an exploded structural schematic diagram of the high-rate cylindrical battery cover plate assembly;

[0020] Figure 2 is a structural schematic diagram of the current collecting plate and the negative electrode post;

[0021] Figure 3 is a cross-sectional view of the high-rate cylindrical battery cover plate assembly;

[0022] Figure 4 is a front view of the current collecting plate and the negative electrode post. Detailed Embodiments

[0023] The following description is only for disclosing the present utility model so that those skilled in the art can implement the present utility model. The embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present utility model can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other schemes that do not depart from the spirit and scope of the present utility model.

[0024]

Embodiment 1

[0025] A high-rate cylindrical battery cover assembly, as Figure 1 , includes a current collector plate 5, a lower plastic 4, an upper cover plate 3, a negative electrode post 2, and an upper plastic 1. After assembly, the structure is as Figure 3 shown. The negative electrode post 2 is connected to the current collector plate 5, and the lower plastic 4, the upper cover plate 3, and the upper plastic 1 are sequentially arranged on the upper side of the current collector plate 5.

[0026] Specifically, as Figure 2 , the current collector plate 5 is integrally disc-shaped. The current collector plate 5 includes a thin and light plate body 5.1 and a thickened plate body 5.2. The thickness of the thickened plate body 5.2 is greater than that of the thin and light plate body 5.1. Among them, the thin and light plate body 5.1 constitutes the base of the disc, and the thin and light plate body 5.1 ensures the welding efficiency and welding quality when welding with the tab of the wound core. The thickened plate body 5.2 is arranged along the radial direction of the disc. As Figure 4 , a pole connection collar 5.4 is arranged on the thickened plate body 5.2. The thickened plate body 5.2 has a large current-carrying area, ensuring a large-rate current-carrying capacity, and acting as a reinforcing rib to prevent the welding deformation problem of the thin and light plate body 5.1, and solving the problem of large internal resistance caused by the narrow and long design of the traditional current collector plate.

[0027] A number of thickened plate bodies 5.2 can be arranged and are arranged along the radial direction of the disc. In this embodiment, as Figure 2 , the thickened plate body 5.2 is arranged in a cross shape. This structure ensures a large-rate current-carrying capacity while not affecting the bending performance of the thin and light plate body 5.1. During the subsequent process of inserting into the shell, the thin and light plate body 5.1 is easily bent, and the welding difficulty is low, thereby improving the production efficiency and production yield.

[0028] Optionally, the thickened plate body 5.2 and the thin and light plate body 5.1 are of an integral stamping structure or a split welding combination.

[0029] As Figure 4 , the pole connection collar 5.4 is used for connecting the negative electrode post 2. In this embodiment, the negative electrode post 2 is composed of four groups of symmetrically arranged fan-shaped structures, and the negative electrode post 2 is connected by circumferential welding.

[0030] At the thickened disc body 5.2, a support structure 5.3 is provided. The support structure 5.3 is used to support the upper cover plate 3, playing a role in supporting, preventing vibration and dissipating heat. Further, the support structure 5.3 is formed by bending a part of the thickened disc body 5.2, which improves the processing efficiency and reduces the cost.

[0031] In this embodiment, a vertical step structure 1.1 is provided on the upper plastic 1. This design can increase the amount of injected glue and the yield rate of the injection molding and demolding process.

[0032] As Figure 2 , a number of vertical groove structures 2.1 are evenly distributed on the outer cylindrical surface of the negative electrode post 2 to increase the injection molding contact surface. The upper plastic 1 is sleeved outside the negative electrode post 2. Compared with the traditional riveting process, the contact internal resistance is reduced, and the injection molding strength is improved. Specifically, the traditional riveting process is to pressurize and expand the electrode post to connect the upper pressing block, the electrode post and the bus bar together. The vertical groove structures 2.1 can increase the injection molding contact surface, improve the injection molding strength and the anti-torsion strength of the structure. Since the injection molding process itself does not require the clearance fit between the electrode post and the pressing block, the internal resistance can be reduced compared with the traditional riveting.

[0033] As Figure 2 , a number of ventilation holes 5.5 are provided on the bus bar 5. The ventilation holes 5.5 can be integrally stamped, playing a role in increasing the electrolyte infiltration and explosion-proof ventilation.

[0034] A battery is provided with the above-mentioned high-rate cylindrical battery cover assembly, which has excellent rate performance. The over-current capacity of the battery core reaches more than 10C, and the temperature rise during the 10C rate discharge test at room temperature does not exceed 15°C.

[0035] Those skilled in the art should understand that the above description and the embodiments of the present invention shown in the drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The function and structural principle of the present invention have been shown and described in the embodiments. Without departing from the said principle, the embodiments of the present invention can have any deformation and modification.

Claims

1. A high-rate cylindrical battery cover assembly, characterized in that: The invention comprises a busbar (5), a lower plastic (4), an upper cover plate (3), a negative pole (2) and an upper plastic (1); the busbar (5) is in the shape of a disc as a whole; the busbar (5) comprises a thin disc body (5.1) and a thickened disc body (5.2); the thickness of the thickened disc body (5.2) is greater than that of the thin disc body (5.1); the thickened disc body (5.2) is arranged along the radial direction of the disc; a pole connecting ring (5.4) is arranged on the thickened disc body (5.2); the thickened disc body (5.2) ensures a high-rate current capacity and acts as a reinforcing rib.

2. The high-rate cylindrical battery cover assembly according to claim 1, characterized in that: The thickened disc body (5.2) is arranged in a cross shape.

3. The high-rate cylindrical battery cover assembly according to claim 2, characterized in that: A supporting structure (5.3) is provided at the thickened disc body (5.2), and the supporting structure (5.3) is used to support the upper cover plate (3).

4. The high-rate cylindrical battery cover assembly according to claim 3, characterized in that: The supporting structure (5.3) is formed by bending a part of the thickened disc body (5.2).

5. The high-rate cylindrical battery cover assembly according to any one of claims 1 to 4, characterized in that: The upper plastic (1) is provided with a vertical step structure (1.1).

6. The high-rate cylindrical battery cover assembly according to claim 5, characterized in that: A plurality of groove structures (2.1) are arranged on the outer circumferential surface of the negative electrode column (2).

7. The high-rate cylindrical battery cover assembly according to any one of claims 1 to 4, characterized in that: The pole connecting ring (5.4) is composed of a plurality of groups of fan-shaped structures.

8. The high-rate cylindrical battery cover assembly according to any one of claims 1 to 4, characterized in that: The confluence plate (5) is provided with a plurality of air holes (5.5).

9. The high-rate cylindrical battery cover assembly according to any one of claims 1 to 4, characterized in that: The thickened disc body (5.2) and the thin disc body (5.1) are of an integrated structure or a split structure.

10. A battery, characterized in that: The battery is provided with a high-rate cylindrical battery cover assembly as described in any one of claims 1 to 9.

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