Collector plate and battery

Abstract

The utility model discloses a collector plate and a battery. The collector plate comprises a central part, the annular part surrounds the central part, and the annular part and the central part are arranged at an interval; the connecting parts are located between the central part and the annular part, one end of each connecting part is connected with the central part, the other end of each connecting part is connected with the annular part, and the multiple connecting parts are arranged in the circumferential direction of the central part at intervals; the connecting part allows the central part to move in a plane perpendicular to the axis of the annular part relative to the annular part and allows the central part to move in the axis direction of the annular part relative to the annular part. According to the collector plate disclosed by the utility model, the connection between the collector plate and the pole group is more stable, and the reliability, the safety and the yield of the battery are improved.

Description

Technical Field

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

[0002] In the related technologies, as lithium-ion power batteries are increasingly used in electric vehicles and large energy storage power stations, the industry has put forward higher and higher requirements on the technical performance, reliability and safety of lithium-ion batteries. When assembling cylindrical lithium-ion batteries, a collector plate is usually used to connect the electrode group and the cover plate so that the battery forms a current loop. The collector plate and the electrode group are fixed after welding, which makes it impossible to center the collector plate and the cover plate, and the battery ears are pulled, resulting in poor reliability. When the internal pressure of the battery is too high and the explosion-proof valve opens, the cover plate often cannot explode because it is welded to the collector plate, and there is a risk of battery temperature loss and explosion. At the same time, the battery has no effective fuse mechanism, and the risk factor is high when thermal runaway occurs, affecting product performance and circuit safety. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a current collecting plate, the connection between the current collecting plate and the electrode group is more stable, and the reliability, safety and yield rate of the battery are improved.

[0004] The utility model also provides a battery, which comprises the above-mentioned current collecting plate.

[0005] According to the collecting plate of the embodiment of the utility model, it includes: a central part; an annular part, which surrounds the central part and is spaced apart from the central part; a connecting part, which is located between the central part and the annular part, one end of the connecting part is connected to the central part, and the other end is connected to the annular part, and the connecting parts are multiple and spaced apart along the circumferential direction of the central part, and the connecting parts allow the central part to move relative to the annular part in a plane perpendicular to the axis of the annular part and allow the central part to move relative to the annular part along the axial direction of the annular part.

[0006] According to the current collecting disk of the embodiment of the utility model, the annular portion surrounds the central portion and is spaced apart from the central portion, the connecting portion is located between the central portion and the annular portion, one end of the connecting portion is connected to the central portion, and the other end is connected to the annular portion, and the connecting portions are multiple and spaced apart along the circumferential direction of the central portion, and the connecting portions allow the central portion to move relative to the annular portion in a plane perpendicular to the axis of the annular portion and allow the central portion to move relative to the annular portion along the axial direction of the annular portion. In this way, the performance of the current collecting disk body and the connection stability between the current collecting disk and the pole group can be ensured, the battery performance and yield rate can be improved, and at the same time, it is beneficial for the explosion-proof valve to open and release pressure, reduce the safety risk of the battery, and thus ensure the safety performance of the battery. In addition, multiple connecting portions are spaced apart along the circumferential direction of the central portion, and the outer periphery of the central portion is partially connected to the inner periphery of the annular portion. The width of a single connecting portion along the circumferential direction is narrow, and it is easy to fuse when the battery is overheated to play an over-temperature protection role, thereby improving the safety of the battery.

[0007] According to the current collecting plate of the embodiment of the utility model, the connecting portion is I-shaped, Z-shaped, U-shaped, W-shaped or wavy.

[0008] According to the current collecting plate of the embodiment of the utility model, one side of the central portion in the thickness direction has a central column.

[0009] According to some embodiments of the present invention, a groove is provided on a side of the central portion facing away from the central column, and the groove is opposite to the central column and extends onto the central column.

[0010] According to the current collecting plate of the embodiment of the utility model, reinforcing ribs are provided on the annular portion.

[0011] According to some embodiments of the present utility model, the reinforcing rib is a protrusion provided on the annular portion, and the protrusion protrudes toward one side in the thickness direction of the annular portion.

[0012] According to some embodiments of the present invention, the reinforcing ribs are multiple and spaced apart along the circumferential direction of the annular portion.

[0013] According to the battery of the embodiment of the utility model, the battery comprises: a shell, one axial end of which is open; a pole group, which is arranged in the shell; a cover plate, which is arranged to cover the open mouth of the shell; the above-mentioned current collecting disk, which is arranged between the cover plate and the pole group, the annular portion is welded to the pole group, and the central portion is welded to the cover plate.

[0014] According to the battery of the embodiment of the utility model, one axial end of the shell is open, the pole group is arranged in the shell, the cover plate is arranged at the open mouth of the shell, the current collecting plate is arranged between the cover plate and the pole group, the annular part is welded to the pole group, and the central part is welded to the cover plate. The structure is simple and the battery assembly process is streamlined, thereby improving the production efficiency of the battery and the product qualification rate. By providing the above-mentioned current collecting plate, the electrical connection stability between the current collecting plate and the cover plate and the pole group can be guaranteed, and the battery performance and yield rate can be improved. At the same time, when the internal thermal runaway of the battery occurs, the connection part of the current collecting plate can be melted to cause the internal circuit of the battery to be broken, which plays a role of overheat protection, improves the safety of the battery, and further effectively protects the safety of the entire circuit in which the battery is located.

[0015] In some embodiments of the present invention, an explosion-proof notch is provided on the cover plate, the explosion-proof notch extends along the circumferential direction of the cover plate, and the central portion is connected to a portion of the cover plate located radially inside the explosion-proof notch.

[0016] In some embodiments of the present invention, the battery is a cylindrical battery.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a three-dimensional diagram of a current collecting plate according to an embodiment of the utility model;

[0020] Figure 2 is a top view of a current collecting plate according to an embodiment of the utility model;

[0021] Figure 3 is along Figure 2 Sectional view along line AA;

[0022] Figure 4 is an exploded diagram of a battery according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] 10. Collecting plate;

[0025] 1. Center; 11. Center column; 12. Groove;

[0026] 2. annular portion; 21. reinforcing ribs;

[0027] 3. Connecting part;

[0028] 20. Battery;

[0029] 4. Shell;

[0030] 5. Pole group;

[0031] 6. Cover plate; 61. Explosion-proof notch. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference below Figure 1-Figure 4 A current collecting plate 10 according to an embodiment of the present invention is described.

[0036] like Figure 1 and Figure 2 As shown, the current collecting plate 10 according to the embodiment of the utility model includes a central portion 1 , an annular portion 2 , and a connecting portion 3 .

[0037] Specifically, Figure 1 As shown, combined Figure 2 and Figure 3 The annular portion 2 surrounds the central portion 1 and is spaced apart from the central portion 1. The connecting portion 3 is located between the central portion 1 and the annular portion 2. One end of the connecting portion 3 is connected to the central portion 1, and the other end is connected to the annular portion 2. The connecting portions 3 are multiple and spaced apart along the circumferential direction of the central portion 1. The connecting portions 3 allow the central portion 1 to move relative to the annular portion 2 in a plane perpendicular to the axis of the annular portion 2 and allow the central portion 1 to move relative to the annular portion 2 along the axial direction of the annular portion 2.

[0038] Among them, the connecting portion 3 is located between the central portion 1 and the annular portion 2 and is arranged at intervals along the circumferential direction of the central portion 1. A hollow area of ​​a certain range is defined between two adjacent connecting portions 3, thereby partially connecting the outer periphery of the central portion 1 and the inner periphery of the annular portion 2. The connecting portion 3 allows a certain displacement between the central portion 1 and the annular portion 2 in a plane perpendicular to the axial direction, compensating for the assembly error existing in the welding assembly process, thereby ensuring the performance of the collecting plate 10. At the same time, the central portion 1 and the annular portion 2 can be electrically connected.

[0039] For example, Figure 4 As shown, when the current collecting plate 10 is arranged in the battery 20, the bottom of the annular portion 2 is welded to the pole group 5, and the top of the central portion 1 is welded to the cover plate 6. After the pole lugs of the battery 20 are welded, the central portion 1 and the cover plate 6 of the battery 20 are easy to generate torque. The connecting portion 3 of the current collecting plate 10 allows the central portion 1 to move relative to the annular portion 2 in a plane perpendicular to the axis of the annular portion 2, thereby effectively alleviating the pulling force on the pole lugs of the battery 20 caused by the incomplete axial symmetry between the central portion 1 and the cover plate 6, thereby ensuring the electrical connection stability between the current collecting plate 10 and the pole group 5, and improving the performance and yield rate of the battery 20. On the other hand, the central portion 1 is connected to the explosion-proof valve. When thermal runaway occurs inside the battery 20, a large amount of high-temperature and high-pressure gas will be generated. Since the connecting portion 3 allows the central portion 1 to move relative to the annular portion 2 along the axial direction of the annular portion 2, it is convenient for the explosion-proof valve to open and release pressure, avoiding the explosion of the battery 20, thereby reducing the safety risk of the battery 20 and ensuring the safety performance of the battery 20. In addition, when the battery 20 is in severe conditions such as overcharge and over-discharge, the large current of the battery 20 will cause the current collecting plate 10 to generate a large amount of heat. The multiple connection parts 3 of the current collecting plate 10 are arranged at intervals along the circumferential direction of the central part 1, and there is a hollow area between two adjacent connection parts 3. The width of a single connection part 3 along the circumferential direction is relatively narrow. When the battery 20 is overheated, it can melt to cause an internal short circuit in the battery 20, thereby providing over-temperature protection for the battery 20, avoiding the risks of overheating, burning, and explosion of the battery 20, and improving the safety of the battery 20.

[0040] According to the collector disk 10 of the embodiment of the utility model, the annular portion 2 surrounds the central portion 1 and is spaced from the central portion 1, the connecting portion 3 is located between the central portion 1 and the annular portion 2, one end of the connecting portion 3 is connected to the central portion 1, and the other end is connected to the annular portion 2, and the connecting portions 3 are multiple and spaced along the circumferential direction of the central portion 1, and the connecting portions 3 allow the central portion 1 to move relative to the annular portion 2 in a plane perpendicular to the axis of the annular portion 2 and allow the central portion 1 to move relative to the annular portion 2 along the axial direction of the annular portion 2. In this way, the performance of the collector disk 10 body and the connection stability between the collector disk 10 and the pole group 5 can be guaranteed, the performance and yield rate of the battery 20 can be improved, and at the same time, it is conducive to the opening of the explosion-proof valve to release pressure, reduce the safety risk of the battery 20, and thus ensure the safety performance of the battery 20. In addition, multiple connecting parts 3 are arranged at intervals along the circumferential direction of the central part 1, partially connecting the outer periphery of the central part 1 with the inner periphery of the annular part 2. The width of a single connecting part 3 along the circumferential direction is relatively narrow, and the battery 20 is easily melted when it is overheated to provide over-temperature protection, thereby improving the safety of the battery 20.

[0041] In some embodiments of the present invention, the connecting portion 3 is I-shaped, Z-shaped, U-shaped, W-shaped or wavy, so that the connecting portion 3 has telescopic capabilities in all directions, thereby allowing the central portion 1 to move relative to the annular portion 2 in a plane perpendicular to the axis of the annular portion 2 and allowing the central portion 1 to move relative to the annular portion 2 along the axial direction of the annular portion 2.

[0042] For example, Figure 1 As shown, there are four connecting parts 3, and the connecting parts 3 are of a Z-shaped structure. The Z-shaped structure includes a first section, a second section, and a third section connected in sequence. The end of the first section away from the second section is connected to the outer periphery of the center part 1, and the end of the third section away from the second section is connected to the inner periphery of the annular portion 2. The first section and the third section extend in the radial direction of the center part 1, and the second section extends in the circumferential direction of the center part 1. The four connecting parts 3 are equidistantly spaced along the circumferential direction of the center part 1. The Z-shaped structure of the connecting parts 3 enables the center part 1 and the annular portion 2 to have a certain relative displacement ability in the axial direction and in a plane perpendicular to the axial direction, thereby compensating for assembly errors existing in the welding assembly process, thereby ensuring the flexibility and product performance of the collecting plate 10.

[0043] Of course, the present invention is not limited thereto, and the connection portion 3 of the current collecting plate 10 may also be I-shaped, U-shaped, W-shaped or wavy. In addition, the number of the connection portions 3 is greater than or equal to 2, and the specific number may be 2, 3, 4, 5, etc. It is understandable that in the specific implementation process, the shape and number of the connection portions 3 of the current collecting plate 10 may be adjusted according to actual needs, and the present application does not make specific limitations on this.

[0044] In some embodiments of the present invention, Figure 1As shown, one side of the center portion 1 in the thickness direction has a center column 11. The center column 11 is arranged at the axial center of the center portion 1. The protrusion of the center column 11 facilitates the effective welding connection between the top of the center column 11 and the cover plate 6, thereby improving the welding effect of the current collecting plate 10 and the cover plate 6, thereby ensuring the connection stability of the current collecting plate 10 in the battery 20 and improving the yield rate of the battery 20.

[0045] In some embodiments of the present invention, Figure 3 As shown, a groove 12 is provided on the side of the center portion 1 away from the center column 11, and the groove 12 is opposite to the center column 11 and extends to the center column 11. During the welding process of the battery 20, if the thickness of the collector plate 10 body is too thick, it is easy to cause the risk of cold welding. If the thickness of the collector plate 10 is too thin, it is easy to cause the risk of welding through or even causing a short circuit. The groove 12 is provided on the center portion 1 at the relative position of the center column 11, so that the thickness of the position where the center column 11 and the cover plate 6 are axially welded can be moderate, so that the collector plate 10 can meet the overcurrent requirements and have sufficient strength, thereby ensuring the welding effect and improving the stability and yield rate of the battery 20.

[0046] The central column 11 may be formed by a portion of the collecting plate 10 protruding toward the cover plate 6 .

[0047] In some embodiments of the utility model, a reinforcing rib 21 is provided on the annular portion 2. This can enhance the strength of the collector plate 10 body, thereby ensuring the performance of the collector plate 10 and the battery 20. The reinforcing rib 21 is provided on the outer periphery of the annular portion 2, and the edge of the reinforcing rib 21 away from the center of the annular portion 2 is flush with the outer edge of the annular portion 2, thereby further increasing the structural strength at the outer edge of the annular portion 2.

[0048] In some embodiments of the utility model, the reinforcing rib 21 is a protrusion provided on the annular portion 2, the protrusion protrudes toward one side in the thickness direction of the annular portion 2, and a recessed portion is provided at a position opposite to the protrusion on the other side in the thickness direction of the annular portion 2, i.e., the side of the annular portion 2 in the thickness direction away from the protrusion, and the protrusion can be formed by a portion of the annular portion 2 protruding toward one side in the thickness direction of the annular portion 2. The reinforcing rib 21 of the protrusion has a simple structure and is easy to process, and the structural strength of the collecting plate 10 can be strengthened without setting up other components. Furthermore, a recessed portion can be provided at a position opposite to the protrusion on the side of the annular portion 2 in the thickness direction away from the protrusion, or it can be flush with the side of the annular portion 2 in the thickness direction away from the protrusion.

[0049] In some embodiments of the present invention, the reinforcing ribs 21 are multiple and spaced apart along the circumferential direction of the annular portion 2. For example, Figure 1 and Figure 2As shown, the three reinforcing ribs 21 are evenly arranged along the outer periphery of the annular portion 2 , thereby making the collecting plate 10 evenly stressed along the circumferential direction, thereby improving the structural strength of the collecting plate 10 .

[0050] Optionally, the projection of the reinforcing rib 21 on the collecting plate 10 may be square, rectangular or fan-shaped, etc., wherein the number and specific shape of the reinforcing rib 21 may be adjusted according to the specific structure of the battery 20 and actual needs, and this application does not make any specific limitations on this.

[0051] The battery 20 according to the embodiment of the present invention is described below.

[0052] The battery 20 according to the embodiment of the present utility model comprises: a housing 4, an electrode group 5, a cover plate 6 and the above-mentioned current collecting plate 10.

[0053] Specifically, Figure 4 As shown, one axial end of the housing 4 is open, the pole group 5 is disposed in the housing 4, and the cover plate 6 is disposed at the open opening of the housing 4, so as to facilitate the assembly of the pole group 5 and the current collecting plate 10. The current collecting plate 10 may be a positive current collecting plate 10, which is disposed between the cover plate 6 and the pole group 5, the annular portion 2 is welded to the pole group 5, and the central portion 1 is welded to the cover plate 6, thereby achieving electrical connection between the current collecting plate 10, the cover plate 6 and the pole group 5, and the structure is simple, thereby streamlining the assembly process of the battery 20, and improving the production efficiency of the battery 20 and the product qualification rate.

[0054] Among them, when the battery 20 is welded, the current collecting plate 10, the cover plate 6 and the pole group 5 will be incompletely axially symmetrical. The connection portion 3 structure of the current collecting plate 10 allows the central portion 1 to move relative to the annular portion 2 in a plane perpendicular to the axis of the annular portion 2, thereby effectively alleviating the torque force generated by the incomplete axial symmetry of the current collecting plate 10, the cover plate 6 and the pole group 5, thereby ensuring the electrical connection stability between the current collecting plate 10 and the cover plate 6 and the pole group 5, and improving the performance and yield rate of the battery 20. In addition, when the battery 20 is in severe conditions such as overcharge and over-discharge, the large current of the battery 20 will cause a large amount of heat accumulation. The connection portion 3 of the current collecting plate 10 can be melted when overheated to cause an internal short circuit in the battery 20, avoiding the risk of overheating, burning, and explosion of the battery 20, improving the safety of the battery 20, and then effectively protecting the safety of the entire circuit in which the battery 20 is located.

[0055] According to the battery 20 of the embodiment of the utility model, one axial end of the shell 4 is open, the pole group 5 is arranged in the shell 4, the cover plate 6 is covered at the open mouth of the shell 4, the current collecting plate 10 is arranged between the cover plate 6 and the pole group 5, the annular portion 2 is welded to the pole group 5, and the central portion 1 is welded to the cover plate 6. The structure is simple, and the assembly process of the battery 20 is streamlined, thereby improving the production efficiency and product qualification rate of the battery 20. By providing the above-mentioned current collecting plate 10, the electrical connection stability between the current collecting plate 10 and the cover plate 6 and the pole group 5 can be guaranteed, and the performance and yield rate of the battery 20 can be improved. At the same time, when the internal thermal runaway of the battery 20 occurs, the connection part 3 of the current collecting plate 10 can be melted to cause the internal circuit of the battery 20 to be broken, which plays a role in overheat protection, improves the safety of the battery 20, and further effectively protects the safety of the entire circuit in which the battery 20 is located.

[0056] In some embodiments of the present invention, Figure 4 As shown, the cover plate 6 is provided with an explosion-proof notch 61, which extends in the circumferential direction of the cover plate 6, and the central portion 1 is connected to the portion of the cover plate 6 located radially inside the explosion-proof notch 61. The battery 20 may generate high-temperature and high-pressure gas during use, and the structure at the explosion-proof notch 61 is weak. When thermal runaway occurs inside the battery 20, the explosion-proof notch 61 will be disconnected, so that the part inside the explosion-proof notch 61 is separated from the part outside, and the central portion 1 of the current collecting plate 10 can move along the axial direction, which can facilitate the part inside the explosion-proof notch 61 to bounce and release pressure, avoid the phenomenon of explosion and fire of the battery 20, thereby reducing the safety risk of the battery 20 and ensuring the safety performance of the battery 20.

[0057] In some embodiments of the present invention, Figure 4 As shown, the battery 20 is a cylindrical battery 20. The cylindrical battery 20 has good mechanical properties. Compared with the square and soft-pack batteries 20, the closed cylinder can obtain the highest bending strength under similar size. At the same time, the existing technology of the cylindrical battery 20 is mature and low in cost.

[0058] Other components of the battery 20 according to the embodiment of the present invention, such as the electrode group 5 including a positive electrode sheet, a negative electrode sheet and a separator, are known to those skilled in the art and will not be described in detail here.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A collecting plate, characterized in that: include: Central Department; an annular portion, the annular portion surrounds the central portion and is spaced apart from the central portion; A connecting portion, wherein the connecting portion is located between the central portion and the annular portion, wherein one end of the connecting portion is connected to the central portion and the other end is connected to the annular portion, wherein the connecting portion is a plurality of connecting portions spaced apart along the circumferential direction of the central portion, and wherein the connecting portion allows the central portion to move relative to the annular portion in a plane perpendicular to the axis of the annular portion and allows the central portion to move relative to the annular portion along the axial direction of the annular portion.

2. The collecting plate according to claim 1, characterized in that: The connecting portion is I-shaped, Z-shaped, U-shaped, W-shaped or wavy.

3. The collecting plate according to claim 1, characterized in that: The central portion has a central column on one side in the thickness direction.

4. The collecting plate according to claim 3, characterized in that: A groove is provided on a side of the central portion away from the central column. The groove is opposite to the central column and extends onto the central column.

5. The collecting plate according to claim 1, characterized in that: The annular portion is provided with reinforcing ribs.

6. The collecting plate according to claim 5, characterized in that: The reinforcing rib is a protrusion arranged on the annular portion, and the protrusion protrudes toward one side in the thickness direction of the annular portion.

7. The collecting plate according to claim 5, characterized in that: The reinforcing ribs are multiple and spaced apart from each other along the circumferential direction of the annular portion.

8. A battery, characterized in that: include: A housing, wherein one axial end of the housing is open; A pole group, the pole group is arranged in the shell; A cover plate, the cover plate is arranged on the open opening of the shell; According to any one of claims 1 to 7, the current collecting disk is arranged between the cover plate and the pole group, the annular portion is welded to the pole group, and the central portion is welded to the cover plate.

9. The battery according to claim 8, characterized in that The cover plate is provided with an explosion-proof notch, which extends along the circumferential direction of the cover plate, and the central portion is at least connected to a portion of the cover plate located radially inside the explosion-proof notch.

10. The battery according to claim 8, characterized in that The battery is a cylindrical battery.

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