Collecting plate, cylindrical battery and battery pack

Abstract

The utility model provides a collector plate, a cylindrical battery and a battery pack, and relates to the technical field of batteries, and the collector plate is characterized in that a terminal is arranged in the center of the top surface of the collector plate; the bottom surface of the current collecting plate is an arc-shaped curved surface, and the radian of the arc-shaped curved surface is consistent with that of a pole lug at the upper end of the folded pole piece in the cylindrical battery; the thickness of the flow collecting disc is sequentially reduced from the center to the edge; the utility model further provides a battery pack which comprises a plurality of cylindrical batteries, and each cylindrical battery comprises the current collecting plate. The collector plate has the beneficial effects that the bottom surface of the collector plate is the arc-shaped curved surface, and the curved surface is attached to the arc-shaped curved surface formed at the upper end of the folded full tab, so that the attaching degree can be improved, the contact area can be increased, and the contact resistance can be reduced; the cross section of the collector plate is thick in the middle and thin in the edge, so that the problem of heating caused by the confluence effect that current of the collector plate converges to the middle can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a current collecting plate, a cylindrical battery and a battery pack. Background Art

[0002] The core function of the collector plate, as an indispensable precision component in the electronics field, is to cleverly use the flat metal plate and precision contact structure to seamlessly connect the various components in the circuit network, thereby efficiently promoting the flow and integration of signals. In battery technology, especially in the construction of high-performance battery systems, the collector plate plays a vital role. It ensures the stability of circuit connections and long-term reliability through advanced welding processes, such as the precise operation of the collector plate welding machine, laying a solid foundation for the efficient conversion and storage of energy.

[0003] However, the design of traditional collector plates is often limited to a single planar structure and uniform thickness, which reveals certain limitations when faced with specific application scenarios, such as the full-ear design of cylindrical batteries. For cylindrical batteries, if the ear is simply flattened, it is very easy to cause blockage in the gap between the pole pieces, which in turn hinders the smooth circulation of the electrolyte and affects the overall performance and life of the battery. Although the use of folded cylindrical full-ears has alleviated the above problems to a certain extent, its curved planar structure is difficult to achieve a perfect fit with the traditional planar collector plate, which undoubtedly increases the contact resistance and affects the smooth transmission of current.

[0004] More importantly, during the battery charge and discharge cycle, due to the uniform design of the collector plate's plane thickness, the current tends to converge in the middle of the collector plate and then be transmitted to the battery terminals. This uneven current distribution not only increases the current density in the middle area, but may also cause overheating in the area, thus affecting the stability and safety of the collector plate and even the entire battery system.

[0005] Therefore, in response to the above challenges, the design of current collector plates in the future needs to pay more attention to structural innovation and material optimization to adapt to the evolving battery technology needs. For example, explore the design of current collector plates with non-uniform thickness or special geometric features to optimize current distribution and reduce local overheating; or use high-performance thermal conductive materials to improve the heat dissipation capacity of the current collector plate to ensure that the battery system can maintain stable temperature control while operating efficiently. Utility Model Content

[0006] In view of the problems existing in the prior art, the utility model provides a current collecting plate, which is applied to a cylindrical battery; the characteristic is that the current collecting plate cover is arranged on the pole piece of the cylindrical battery;

[0007] The bottom surface of the current collecting plate is an arc-shaped curved surface, and the curvature of the arc-shaped curved surface is consistent with the curvature of the upper end pole ear of the folded pole piece in the cylindrical battery.

[0008] Preferably, a terminal is provided on the top surface of the collecting plate.

[0009] Preferably, the terminal is arranged at the center of the top surface of the current collecting plate;

[0010] Preferably, the thickness of the collecting plate gradually decreases from the center to the edge.

[0011] Preferably, a plurality of openings are formed on the top surface of the collecting plate.

[0012] Preferably, each of the openings is V-shaped.

[0013] Preferably, the top angle of the V-shaped opening faces the center of the collecting plate.

[0014] Preferably, the spacings between adjacent openings are equal.

[0015] The utility model also provides a cylindrical battery, wherein the pole piece upper cover of the cylindrical battery is provided with the current collecting disk as described above.

[0016] The utility model also provides a battery pack, in which the plurality of cylindrical batteries as described above are integrated.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] 1) The bottom surface of the current collecting plate in the utility model is an arc-shaped surface, which fits the arc-shaped surface formed at the upper end after the full pole ear is folded, so as to improve the fit, increase the contact area and reduce the contact resistance;

[0019] 2) The cross section of the collector plate is thick in the middle and thin at the edges, which can solve the heating problem caused by the convergence effect of the current in the collector plate converging to the middle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a current collecting plate in a preferred embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional schematic diagram of a current collecting plate in a preferred embodiment of the utility model;

[0022] Figure 3 This is a schematic diagram of the bonding of the folded pole ear and the traditional current collecting plate in a preferred embodiment of the utility model;

[0023] Figure 4 This is a schematic diagram of the folded pole ear and the current collecting plate being attached in a preferred embodiment of the utility model;

[0024] Figure 5 This is a top view of the current collecting plate in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. The present invention is not limited to the implementation mode, and other implementation modes may also fall within the scope of the present invention as long as they meet the purpose of the present invention.

[0026] In a preferred embodiment of the present utility model, based on the above problems existing in the prior art, a current collecting plate of a cylindrical battery is provided. Figure 1 and Figure 2 As shown, including:

[0027] The bottom surface of the current collecting plate 1 is an arc-shaped curved surface, and the curvature of the arc-shaped curved surface is consistent with the curvature of the upper end pole ear 4 of the folded pole piece 3 in the cylindrical battery.

[0028] Specifically, in this embodiment, Figure 3 The figure shows a schematic diagram of a structure in which a conventional planar collector plate is used and the tabs are flattened and then bonded together; Figure 4 It is a schematic structural diagram of the folded upper pole ear 4 and the current collecting plate 1 in this embodiment.

[0029] like Figure 3 As shown in the figure, if a traditional planar collector plate is used, the full pole ear of the cylindrical battery needs to be flattened. After flattening, the pole ear is easy to block the gap between the pole pieces, affecting the electrolyte reflux. In addition, the flattening method will cause the pole ear thickness to be different at different places, which will cause uneven stress at different places after the planar collector plate is installed, which is easy to cause structural damage. If the cylindrical full pole ear is folded, the upper end pole ear 4 after folding will present a curved plane structure, which may not fit the planar collector plate. Figure 4 As shown, the current collecting plate 1 in this embodiment is used when the cylindrical full pole ear is in a folded form, which allows the pole ear 4 to be folded to form a full pole ear structure without additional cutting design of the pole ear, and there is no need to flatten the pole ear 4, which simplifies the manufacturing process of the full pole ear 4 and avoids the flattened structure of the pole ear 4 affecting the electrolyte reflux; the curvature of the arc-shaped surface of the bottom surface of the current collecting plate 1 in this embodiment is consistent with the curvature of the upper end pole ear 4 after the pole piece 3 in the cylindrical battery is folded, and can fit the folded full pole ear surface, thereby increasing the contact area between the pole ear and the current collecting plate and reducing the contact resistance;

[0030] In a preferred embodiment of the present invention, the thickness of the current collecting plate 1 decreases from the center to the edge.

[0031] Specifically, the current collecting plate 1 in this embodiment adopts a design of being thick in the middle and thin at the edges, allowing a larger current to pass through the center position, which can solve the convergence effect caused by the current converging to the middle of the current collecting plate 1 and solve the heating problem caused by excessive current passing through the middle position of the current collecting plate 1.

[0032] In a preferred embodiment of the present invention, a terminal 2 is provided at the center of the top surface of the current collecting plate 1 .

[0033] Specifically, the current collecting plate 1 in this embodiment can be covered on both ends of the pole piece 3, with one end retaining the terminal 2 on the current collecting plate 1 as the positive electrode, and the other end removing the terminal 2 as the negative electrode.

[0034] In a preferred embodiment of the present invention, a plurality of openings 5 ​​are formed on the top surface of the collecting plate 1. Each opening 5 is V-shaped, with the top angle of the V-shaped opening 5 facing the terminal 2 at the center of the collecting plate, and the spacing between adjacent openings 5 ​​is equal.

[0035] Specifically, in this embodiment, Figure 1 and Figure 5 As shown, a plurality of openings 5 ​​are provided on the top surface of the collecting plate 1. Each opening 5 is V-shaped. It can be seen that the opening has a certain width, which can reserve a certain space for deformation. By evenly providing a plurality of such openings 5 ​​on the collecting plate 1, the deformation resistance of the collecting plate 1 can be improved.

[0036] The utility model also provides a battery pack, comprising a plurality of cylindrical batteries, each of which comprises the above-mentioned current collecting plate.

[0037] Specifically, in this embodiment, a cylindrical battery including the current collecting plate 1 described above is used in a battery pack, which can reduce the contact resistance in the battery pack and solve the problem of current collection heating.

[0038] The above are only preferred embodiments of the present invention, and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the content of this specification and illustrations should be included in the protection scope of the present invention.

Claims

1. A current collecting plate, applied to cylindrical batteries; characterized in that: The current collecting plate cover is arranged on the pole piece of the cylindrical battery; The bottom surface of the current collecting plate is an arc-shaped curved surface, and the curvature of the arc-shaped curved surface is consistent with the curvature of the upper end pole ear of the folded pole piece in the cylindrical battery.

2. The collecting plate according to claim 1, characterized in that: The top surface of the current collecting plate is provided with a terminal.

3. The collecting plate according to claim 2, characterized in that: The terminal is disposed at the center of the top surface of the current collecting plate.

4. The collecting plate according to claim 1, characterized in that: The thickness of the collecting plate gradually decreases from the center to the edge.

5. The collecting plate according to claim 1, characterized in that: The top surface of the current collecting plate is provided with a plurality of openings.

6. The collecting plate according to claim 5, characterized in that: Each of the openings is V-shaped.

7. The collecting plate according to claim 6, characterized in that: The top angle of the V-shaped opening faces the center of the collecting plate.

8. The collecting plate according to claim 5, characterized in that: The spacings between adjacent openings are equal.

9. A cylindrical battery, characterized in that: The pole piece cover of the cylindrical battery is provided with a current collecting plate as described in any one of claims 1-8.

10. A battery pack, characterized in that: The battery pack integrates a plurality of cylindrical batteries as described in claim 9.

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