Cylindrical battery monomer and battery module

Abstract

The utility model relates to the technical field of batteries, particularly provides a cylindrical battery monomer and a battery module, and aims to solve the technical problems of small effective welding area and poor circuit break protection effect of an anti-explosion valve caused by unreasonable position arrangement of a welding area of the anti-explosion valve and a roll core on a cover plate. Therefore, the cylindrical battery monomer provided by the utility model comprises a shell with an opening; the electrode assembly is arranged in the shell; the cover plate is arranged at the opening and comprises a first convex part which is electrically connected with the electrode assembly; and the weak part is arranged on the cover plate and is positioned between the first convex part and the edge of the cover plate, so that the valve opening area of the weak part and the welding area of the first convex part and the electrode assembly are ensured, a circuit can be quickly disconnected for circuit break protection, and the safety characteristic of the battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and specifically provides a cylindrical battery monomer and a battery module. Background Art

[0002] Lithium-ion batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and small self-discharge coefficient. They are one of the most widely used batteries in the world today and an important part of the development of new energy.

[0003] With the continuous upgrading of market demand, cylindrical batteries have developed from 18650 and 21700 to the larger and more energy-dense 4680 series cylindrical batteries. Compared with 18650 and 21700 cylindrical cells, the 4680 cylindrical battery adopts a full-ear design, which effectively shortens the current path, promotes smoother movement of electrons inside the battery, reduces the internal resistance of the cell itself, and significantly reduces Joule heat loss. In addition, cylindrical batteries are made of stainless steel, have higher mechanical strength, and can effectively absorb the pressure caused by the expansion of the negative electrode, so they are more suitable for high-silicon and high-nickel systems.

[0004] In order to improve the space utilization of large cylindrical batteries in the height direction and the energy density of the batteries, and at the same time reduce the number of structural parts of the batteries, the existing technology is to cancel the negative electrode collector plate welded to the winding core and the shell, and weld the cover plate to the winding core and the shell, which puts higher requirements on the structural design of the cover plate. The problem with the structure of the cover plate in the existing technology is that the relative position of the explosion-proof valve on the cover plate and the welding area of ​​the winding core is not set reasonably, resulting in a small effective welding area between the cover plate and the pole ear, and the explosion-proof valve fails to disconnect quickly and completely and play a role in circuit breaker protection. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the technical problem that the unreasonable position setting of the explosion-proof valve and the coil core welding area on the cover plate leads to a small effective welding area and poor circuit breaker protection effect of the explosion-proof valve.

[0006] In a first aspect, the utility model provides a cylindrical battery cell, comprising: a shell having an opening; an electrode assembly disposed in the shell; a cover plate disposed at the opening, the cover plate comprising: a first protrusion electrically connected to the electrode assembly; a weak portion disposed on the cover plate, and the weak portion is located between the first protrusion and the edge of the cover plate.

[0007] In the above technical solution, the weak part is arranged between the first protrusion and the edge of the cover plate. Compared with the prior art in which the weak part is arranged on the inner side of the first protrusion, the valve opening area of ​​the weak part is larger. In the event of thermal runaway of the battery, the weak part can be detached from the first protrusion at the moment of explosion, thereby promptly disconnecting the electrical connection between the first protrusion and the electrode assembly, thereby achieving rapid circuit-breaking protection.

[0008] In some embodiments, the weak portion is arc-shaped; or, the weak portion is circular, and the diameter of the weak portion accounts for a percentage greater than or equal to 65% and less than or equal to 95% of the diameter of the cover plate.

[0009] In some embodiments, the weakened portion is circular, and a diameter of the weakened portion is greater than or equal to 30 mm and less than or equal to 44 mm.

[0010] In the above technical solution, if the diameter of the weak portion is set too large, it will affect the welding effect of the cover plate and the shell, and if the diameter of the weak portion is set too small, it will affect the welding area of ​​the cover plate and the electrode assembly.

[0011] In some embodiments, the cover plate further includes a second protrusion, the second protrusion is electrically connected to the shell, the first protrusion and the second protrusion are connected via a connecting portion, and the weak portion is provided at the connecting portion.

[0012] In some embodiments, the connecting portion is plate-shaped, and the weak portion is a notch located on the connecting portion toward and / or away from the electrode assembly.

[0013] In some embodiments, the cover plate has a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged along the radial direction of the cover plate and connected to the second protrusion.

[0014] In the above technical solution, a plurality of reinforcing ribs are provided on the cover plate, which can enhance the overall strength of the cover plate and ensure the flatness of the cover plate during the welding process.

[0015] In some embodiments, the cover plate and the side wall of the shell are interference fit, and the second protrusion abuts against the side wall of the shell.

[0016] In the above technical solution, the interference fit can increase the connection strength between the shell and the cover plate and improve the sealing performance.

[0017] In some embodiments, the shell also includes a top wall, which is arranged opposite to the opening and connected to the side wall, and has an electrode lead-out hole; a pole is arranged in the electrode lead-out hole and is electrically connected to the electrode assembly.

[0018] In the above technical solution, the top wall and the pole can be used as two output poles of the cylindrical battery cell, which can simplify the structure of the cylindrical battery cell and ensure the flow capacity of the cylindrical battery cell. The top wall and the pole are located at the same end of the cylindrical battery cell, so that the converging component can be assembled to the same side of the cylindrical battery cell, simplifying the assembly process and improving the efficiency of assembling multiple cylindrical battery cells into groups.

[0019] In some embodiments, the second protrusion includes a vertical portion, and in the thickness direction of the cover plate, the end of the vertical portion away from the electrode assembly is a first outer end surface, and the side wall surrounding the opening is a second outer end surface, and the first outer end surface is flush with the second outer end surface.

[0020] In the above technical solution, the first outer end face and the second outer end face are arranged flush so that the edge of the cover plate is flush with the bottom wall of the shell. In this way, when the cylindrical battery cell is assembled into the battery module, the height of the cylindrical battery cell is consistent and will not tilt, which is also conducive to the installation and welding of the busbar.

[0021] In some embodiments, the second protrusion further includes a guide portion, which is connected to one end of the vertical portion close to the electrode assembly, and the guide portion is arc-shaped to guide the second protrusion to be installed on the shell.

[0022] In the above technical solution, by providing a guide portion on the second protrusion, the second protrusion can be guided to be installed on the shell when the cover is assembled, thereby simplifying the assembly process and improving the assembly efficiency.

[0023] In some embodiments, in the thickness direction, the first protrusion is closer to the electrode assembly than the second protrusion; and / or the connecting portion is closer to the electrode assembly than the end of the side wall.

[0024] In some embodiments, the first protrusion is welded to the electrode lug of the electrode assembly to form a welding area, and the minimum distance between the welding area and the center of the cover plate is greater than or equal to 10 mm and less than or equal to 20 mm, and the maximum distance is greater than or equal to 28 mm and less than or equal to 39 mm.

[0025] In the above technical solution, if the minimum distance between the welding area and the center of the cover plate is set too small, the cover plate and the electrode assembly cannot be welded, and if the minimum distance is set too large, the effective welding area of ​​the cover plate and the electrode assembly will be lost; if the maximum distance between the welding area and the center of the cover plate is set too small, the effective welding area of ​​the cover plate and the electrode assembly will be lost, and if the maximum distance is set too large, the cover plate and the electrode assembly cannot be welded.

[0026] In a second aspect, the utility model further provides a battery module, wherein the battery module comprises a plurality of the above-mentioned cylindrical battery cells.

[0027] The advantages of the battery module and the cylindrical battery cell described above over the prior art are the same, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a cross-sectional view of a cylindrical battery cell provided by an embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of a cover plate provided by an embodiment of the utility model;

[0031] Figure 3 It is a partial cross-sectional view of a cylindrical battery cell provided by an embodiment of the utility model;

[0032] Figure 4 yes Figure 3 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0033] List of reference numerals:

[0034] 1. Shell; 11. Side wall; 111. Second outer end surface; 12. Top wall; 13. Pole; 2. Electrode assembly; 3. Cover plate; 31. First protrusion; 32. Weak portion; 33. Second protrusion; 331. Vertical portion; 3311. First outer end surface; 332. Guide portion; 34. Connecting portion; 4. Reinforcing ribs. DETAILED DESCRIPTION

[0035] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0036] It should be noted that in the description of the present invention, the terms "inside", "outside", "top", "bottom" and other terms indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0039] In the prior art, in order to improve the space utilization rate of large cylindrical batteries in the height direction and the energy density of the battery, and at the same time reduce the number of structural parts of the battery, the specific method is to cancel the negative electrode collector plate welded to the winding core and the shell, and weld the cover plate to the winding core and the shell. The inventor found that since the cover plate is also provided with a weak structure for timely explosion to prevent thermal runaway, the weak structure is usually arranged at the center of the cover plate. At the same time, in order to ensure a stable valve opening area, the weak part occupies a large area at the center of the cover plate. In addition, after the negative electrode collector plate is cancelled, the cover plate is welded to the electrode assembly. Due to the relative position relationship between the weak structure and the cover plate, the welding area between the cover plate and the electrode assembly is small, which increases the internal resistance of the cylindrical battery cell, reduces the overcurrent efficiency, and seriously affects the performance of the cylindrical battery cell. Based on this, the inventor provides a cylindrical battery cell that can solve the above-mentioned technical problems. The specific embodiments of the cylindrical battery cell of the utility model are described in detail below in conjunction with the accompanying drawings.

[0040] Please refer to Figures 1 to 4 , Figures 1 to 4 This is a schematic structural diagram of a cylindrical battery cell and a cover plate 3 provided in an embodiment of the utility model.

[0041] like Figure 1 to Figure 2As shown, the cylindrical battery cell of the embodiment of the present application includes: a shell 1, which has an opening; an electrode assembly 2, which is arranged in the shell 1; a cover plate 3, which is arranged at the opening of the shell 1; the cover plate 3 includes a first convex portion 31, which is electrically connected to the electrode assembly 2; and a weak portion 32, which is arranged between the first convex portion 31 and the edge of the cover plate 3. The shell 1 is a hollow structure with an opening on one side. The cover plate 3 covers the opening of the shell 1 and forms a sealed connection, which is used to accommodate the electrode assembly 2 and the electrolyte. The shape of the shell 1 can be determined according to the specific shape of the electrode assembly 2. In this embodiment, the electrode assembly 2 is a cylindrical structure, and the shell 1 is selected as a cylindrical shell 1. The shell 1 can be positively charged, negatively charged, or uncharged. In this embodiment, the shell 1 is directly connected to the electrode assembly 2, and the shell 1 is charged. Optionally, the cover plate 3 and the shell 1 can be connected by welding, so that the cover plate 3 and the shell 1 can have substantially the same potential. The cover plate 3 and the shell 1 can be made of the same material, for example, the base material of the cover plate 3 and the shell 1 is the same, both are steel, so that the welding strength of the shell 1 and the cover plate 3 can be ensured and the sealing of the cylindrical battery cell can be improved; they can also be made of different materials.

[0042] In the present embodiment, the cover plate 3 is a plate-like structure, which forms inner and outer surfaces that are opposite and parallel to each other in the thickness direction. The first protrusion 31 is processed on the cover plate 3, that is, it protrudes relative to the cover plate 3 in the direction of the electrode assembly 2. When the cover plate 3 is installed on the shell 1, the first protrusion 31 is in close contact with the electrode assembly 2. In order to ensure that the effective welding area between the cover plate 3 and the electrode assembly 2 is large enough, the first protrusion 31 is set on the cover plate 3 to cover the length of the diameter direction of the electrode assembly 2. The first protrusion 31 can be set as a single or multiple, and there is no limitation here. In the present embodiment, the first protrusion 31 is set as three. In some embodiments, the surface of the cover plate 3 is processed with a notch that is less than the thickness of the cover plate 3, facing the electrode assembly 2 or away from the electrode assembly 2, or both sides are processed, so that when the thermal runaway pressure increases inside the cylindrical battery cell, the pressure can be quickly exploded to release pressure and protect the safety of the cylindrical battery cell. In this embodiment, the weak portion 32 is arranged on one side of the first protrusion 31 close to the edge of the cover plate 3. Compared with the existing weak portion 32 arranged in the central area, on the one hand, the influence on the welding area between the cover plate 3 and the electrode assembly 2 can be reduced. On the other hand, while increasing the valve opening area of ​​the weak portion 32, the weak portion 32 can pull the first protrusion 31 away from the cover plate 3 at the moment of bursting, and disconnect from the electrode assembly 2 in time, with higher safety performance. Further, the shape of the weak portion 32 can be an arc, such as a C shape, or a circle. In the case where the shape of the weak portion 32 is circular, the diameter of the weak portion 32 accounts for a percentage of the diameter of the cover plate 3 greater than or equal to 65% and less than or equal to 95%. Furthermore, the diameter of the weak portion 32 is greater than or equal to 30 mm and less than or equal to 44 mm. In this way, the welding area of ​​the first protrusion 31 and the electrode assembly 2 is guaranteed, and the welding effect of the cover plate 3 and the shell 1 is not affected. In this embodiment, the first protrusion 31 and the pole ear of the electrode assembly 2 are welded to form a welding area, and the minimum distance of the welding area from the center of the cover plate 3 is greater than or equal to 10 mm and less than or equal to 20 mm, and the maximum distance is greater than or equal to 28 mm and less than or equal to 39 mm. Thus, both the effective welding area of ​​the cover plate 3 and the electrode assembly 2 is guaranteed, and the welding effect of the cover plate 3 and the electrode assembly 2 is also guaranteed. In some embodiments, the cover plate 3 has a plurality of reinforcing ribs 4, and the plurality of reinforcing ribs 4 are arranged radially along the cover plate 3 and connected to the second protrusion 33. In this embodiment, the number of reinforcing ribs 4 is three, and the angle between each two is 120°. In this way, the setting of the reinforcing ribs 4 can ensure the overall strength of the cover plate 3. At the same time, when the cover plate 3 is welded to the shell 1 or to the electrode assembly 2, the reinforcing ribs 4 can also play a role in enhancing the welding flatness of the cover plate 3.

[0043] like Figure 3 to Figure 4As shown, the cover plate 3 in this embodiment also includes a second protrusion 33, the second protrusion 33 is electrically connected to the shell 1, the second protrusion 33 and the first protrusion 31 are connected through a connecting portion 34, and the weak portion 32 is provided at the connecting portion 34. In this embodiment, the second protrusion 33 is an annular structure surrounding the outside of the cover plate 3, and the second protrusion 33 is processed on the cover plate 3, and protrudes relative to the cover plate 3 facing the electrode assembly 2. In some embodiments, the cover plate 3 and the side wall 11 of the shell 1 are interference fit, and the second protrusion 33 abuts against the side wall 11 of the shell 1. The interference fit can increase the connection strength between the shell 1 and the cover plate 3 and improve the sealing performance. At the same time, the shell 1 and the cover plate 3 are interference fit, and no external equipment is required to fix the cover plate 3, which simplifies the assembly process. Optionally, the second protrusion 33 and the shell 1 are connected by laser welding. When welding the second protrusion 33 and the side wall 11 of the shell 1, the laser is irradiated at the connection between the second protrusion 33 and the side wall 11, and the laser partially melts and connects them together to achieve sealing and reduce the risk of electrolyte leakage from the connection. In some embodiments, the second protrusion 33 includes a vertical portion 331. In the thickness direction of the cover plate 3, the end of the vertical portion 331 away from the electrode assembly 2 is the first outer end face 3311, and the side wall 11 surrounding the opening is the second outer end face 111. The first outer end face 3311 and the second outer end face 111 are flush. The first outer end face 3311 and the second outer end face 111 are set flush, so that the edge of the cover plate 3 is flush with the bottom wall of the shell 1, so that when the cylindrical battery cell is assembled into the battery module, the height of the cylindrical battery cell is consistent and will not tilt, which is also conducive to the installation and welding of the busbar. Furthermore, the second protrusion 33 also includes a guide portion 332, which is connected to one end of the vertical portion 331 close to the electrode assembly 2, and the guide portion 332 is arc-shaped to guide the second protrusion 33 to be installed on the shell 1. The guide portion 332 is spaced apart from the side wall 11, and the distance between the surface of the guide portion 332 close to the side wall 11 along the radial direction of the cover plate 3 gradually increases. By providing an arc-shaped guide portion 332, the second protrusion 33 can be guided to be inserted into the shell 1 when assembling the cover plate 3 and the shell 1, simplifying the assembly process and improving the assembly efficiency. Furthermore, in the thickness direction of the cover plate 3, the first protrusion 31 is closer to the electrode assembly 2 than the second protrusion 33; and / or, the connecting portion 34 is closer to the electrode assembly 2 than the end of the side wall 11. In this way, it is beneficial to the assembly of the cover plate 3 and the integration of the cylindrical battery cell into the battery module.

[0044] like Figures 1 to 4As shown, in this embodiment, the shell 1 includes a side wall 11 and a top wall 12, and the top wall 12 is arranged opposite to the opening and connected to the side wall 11. The side wall 11 and the top wall 12 can be an integrally formed structure, that is, the shell 1 is an integrally formed component. In addition, the side wall 11 and the top wall 12 can also be two components arranged separately, and then connected together by welding or the like, which is not limited here. The side wall 11 is a cylindrical structure, and the top wall 12 is a plate-like structure, and its shape corresponds to the shape of the side wall 11. An opening is formed at one end of the side wall 11, and the top wall 12 is connected to the other end of the side wall 11 away from the opening. In some embodiments, the top wall 12 has an electrode lead-out hole, and the pole 13 is insulated and arranged on the top wall 12. The pole 13 can be fixed as a whole on the outside of the top wall 12, or it can extend into the interior of the shell 1 through the electrode lead-out hole. In this embodiment, an electrode lead-out hole for installing the pole 13 is formed on the top wall 12 by a hole-opening process. The top wall 12 is formed by processing the shell 1. The setting of the electrode lead-out hole will not affect the flatness of the top wall 12, and enhance the connection strength between the top wall 12 and the busbar. The top wall 12 and the pole 13 can be used as two output poles of the cylindrical battery cell, simplifying the structure of the cylindrical battery cell and ensuring the current capacity of the cylindrical battery cell. The top wall 12 and the pole 13 are arranged at the same end of the cylindrical battery terminal, so that the busbar can be assembled to the same side, simplifying the assembly process and improving the efficiency of assembling multiple cylindrical battery cells into groups. In some embodiments, the electrode assembly 2 has a positive pole ear and a negative pole ear, the positive pole ear is connected to the pole 13, and the negative pole ear is connected to the cover plate 3; it is also possible that the positive pole ear is connected to the cover plate 3 and the negative pole ear is connected to the pole 13. When the positive pole tab is connected to the pole 13 and the negative pole tab is connected to the cover plate 3, the pole 13 is the positive output pole of the cylindrical battery cell and the cover plate 3 is the negative output pole of the cylindrical battery cell; when the positive pole tab is connected to the cover plate 3 and the negative pole tab is connected to the pole 13, the pole 13 is the negative output pole of the cylindrical battery cell and the cover plate 3 is the positive output pole of the cylindrical battery cell. The positive pole tab and the negative pole tab are arranged at both ends of the electrode assembly 2, which can reduce the risk of conduction between the positive and negative pole tabs and increase the flow area of ​​the positive pole tab and the flow area of ​​the negative pole tab.

[0045] The utility model also provides a battery module having a plurality of cylindrical battery cells. The beneficial effects of the battery module are the same as the advantages of the cylindrical battery cells in this embodiment over the prior art, which will not be described in detail here.

[0046] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A cylindrical battery cell, characterized in that: include: a housing having an opening; An electrode assembly is disposed in the housing; A cover plate is provided at the opening, and the cover plate includes: a first convex portion, and a first protrusion, Electrical connection; The weak portion is disposed on the cover plate, and the weak portion is located between the first protrusion and the edge of the cover plate.

2. The cylindrical battery cell according to claim 1, characterized in that: The weak portion is arc-shaped; or, The weak portion is circular, and the percentage of the diameter of the weak portion to the diameter of the cover plate is greater than or equal to 65% and less than or equal to 95%.

3. The cylindrical battery cell according to claim 1, characterized in that: The weak portion is circular, and a diameter of the weak portion is greater than or equal to 30 mm and less than or equal to 44 mm.

4. The cylindrical battery cell according to claim 1, characterized in that: The cover plate further includes a second protrusion, the second protrusion is electrically connected to the shell, the first protrusion and the second protrusion are connected via a connecting portion, and the weak portion is provided at the connecting portion.

5. The cylindrical battery cell according to claim 4, characterized in that: The connecting portion is plate-shaped, and the weak portion is a notch located on the connecting portion toward and / or away from the electrode assembly.

6. The cylindrical battery cell according to claim 4, characterized in that: The cover plate has a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged along the radial direction of the cover plate and connected to the second protrusion.

7. The cylindrical battery cell according to claim 4, characterized in that: The cover plate and the side wall of the shell are interference fit, and the second protrusion abuts against the side wall of the shell.

8. The cylindrical battery cell according to claim 7, characterized in that: The shell also includes a top wall, which is arranged opposite to the opening and connected to the side wall, and has an electrode lead-out hole; a pole, which is arranged in the electrode lead-out hole and is electrically connected to the electrode assembly.

9. The cylindrical battery cell according to claim 7, characterized in that: The second convex portion includes a vertical portion, and in the thickness direction of the cover plate, the end of the vertical portion away from the electrode assembly is a first outer end surface, and the side wall surrounding the opening is a second outer end surface, and the first outer end surface is flush with the second outer end surface.

10. The cylindrical battery cell according to claim 9, characterized in that: The second protrusion also includes a guide portion, which is connected to one end of the vertical portion close to the electrode assembly, and the guide portion is arc-shaped to guide the second protrusion to be installed on the shell.

11. The cylindrical battery cell according to claim 10, characterized in that: In the thickness direction, the first protrusion is closer to the electrode assembly than the second protrusion; and / or the connecting portion is closer to the electrode assembly than the end of the side wall.

12. The cylindrical battery cell according to claim 1, characterized in that: The first protrusion is welded to the electrode ear of the electrode assembly to form a welding area, and the minimum distance between the welding area and the center of the cover plate is greater than or equal to 10 mm and less than or equal to 20 mm, and the maximum distance is greater than or equal to 28 mm and less than or equal to 39 mm.

13. A battery module, characterized in that: The invention comprises a plurality of cylindrical battery cells according to any one of claims 1 to 12.

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