Collecting plate and cylindrical battery

Abstract

The utility model provides a current collecting plate and a cylindrical battery, relates to the technical field of batteries, and aims to optimize the structure of the current collecting plate to a certain extent and avoid the risk of short circuit caused by crushing a battery cell by penetrating and welding the current collecting plate. The collector plate provided by the utility model is used for a cylindrical battery cell and comprises a tab connecting part, a deformation part and a pole connecting part, the deformation part is positioned between the tab connecting part and the pole connecting part, and the horizontal heights of the tab connecting part, the deformation part and the pole connecting part towards one side of the cylindrical battery cell are gradually increased in sequence, so that a buffer space is formed between the corresponding position of the deformation part and the cylindrical battery cell.

Description

Technical Field

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

[0002] The connection methods between the collector plate and the pole of cylindrical battery cells are mostly torque welding, seam welding or penetration welding. Among them, the process of connecting the collector plate and the pole by "penetration welding" is one of the most widely used methods in the industry. It has the advantages of strong mass production, high efficiency and low requirements for equipment addressing accuracy.

[0003] However, the "penetration welding" process requires a high degree of fit between the battery cell structures. If there are gaps between welded parts, poor welding will occur, causing quality problems and a waste of manpower and material resources.

[0004] Therefore, during the manufacturing process of the battery cell, the collector plate is placed on the side end face of the battery cell ear, and then a force is applied on the other side to ensure that the welding point of the collector plate fits with the welding point of the pole. In order to ensure the yield rate of penetration welding, it is usually necessary to design the height of the collector plate with interference. Therefore, when pressure is applied on the other side to make the collector plate fit with the pole, the collector plate will apply a reaction force to the battery cell in the reverse direction, thereby causing the risk of crushing the battery cell and causing a short circuit.

[0005] Therefore, there is an urgent need to provide a current collecting plate and a cylindrical battery to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0006] The utility model aims to provide a current collecting plate and a cylindrical battery, so as to optimize the structure of the current collecting plate to a certain extent, and avoid the risk of penetrating the welding current collecting plate and crushing the battery cell to cause a short circuit.

[0007] The utility model provides a current collecting plate, which is arranged on the end face of the pole ear side of a cylindrical battery cell, and comprises a pole ear connecting portion, a deformation portion and a pole column connecting portion; the deformation portion is located between the pole ear connecting portion and the pole column connecting portion, and along the height direction of the cylindrical battery cell, the distance between the deformation portion and the end face of the pole ear side of the cylindrical battery cell is smaller than the distance between the pole column connecting portion and the end face of the pole ear side of the cylindrical battery cell, so that a buffer space is formed between the corresponding position of the deformation portion and the cylindrical battery cell.

[0008] Wherein, the area of ​​the deformation portion does not exceed 30% of the sum of the areas of the deformation portion, the pole lug connection portion and the pole connection portion.

[0009] Specifically, along the height direction of the cylindrical battery core, the thickness of the deformation portion is 0.15 mm-0.25 mm.

[0010] Furthermore, along the height direction of the cylindrical battery cell, the difference in height between the surface of the deformation portion facing the cylindrical battery cell and the surface of the pole ear connecting portion facing the cylindrical battery cell is 0.45mm-0.55mm; the difference in height between the surface of the pole ear connecting portion away from the cylindrical battery cell and the surface of the deformation portion away from the cylindrical battery cell is 1.05mm-1.15mm.

[0011] Wherein, a plurality of hollow portions are arranged on the deformation portion, and the plurality of hollow portions are evenly distributed along the circumference of the pole connecting portion, and two ends of the deformation portion are respectively connected to the pole lug connecting portion and the pole connecting portion.

[0012] Specifically, the area of ​​the plurality of hollow portions is not greater than 50% of the sum of the area of ​​the hollow portion and the area of ​​the deformation portion.

[0013] Specifically, the thickness of the deformation part is 0.35mm-0.45mm; the height difference between the surface of the deformation part facing the cylindrical battery cell and the surface of the pole ear connecting part facing the cylindrical battery cell is 0.25mm-0.35mm; the height difference between the surface of the pole ear connecting part away from the cylindrical battery cell and the surface of the deformation part away from the cylindrical battery cell is 1.05mm-1.15mm.

[0014] Furthermore, the pole lug connection portion, the deformation portion and the pole connection portion are integrally stamped, and a transition portion is formed between the deformation portion and the pole connection portion.

[0015] Furthermore, the current collecting plate provided by the utility model also includes reinforcing ribs, and the reinforcing ribs are multiple, and the multiple reinforcing ribs are formed on the side of the pole tab connecting portion away from the cylindrical battery core, and are evenly distributed along the circumference of the pole tab connecting portion.

[0016] Compared with the prior art, the collector provided by the utility model has the following advantages:

[0017] The current collecting plate provided by the utility model is arranged on the end face of the pole ear side of the cylindrical battery cell, and comprises a pole ear connecting part, a deformation part and a pole column connecting part; the deformation part is located between the pole ear connecting part and the pole column connecting part, and along the height direction of the cylindrical battery cell, the distance between the deformation part and the end face of the pole ear side of the cylindrical battery cell is smaller than the distance between the pole column connecting part and the end face of the pole ear side of the cylindrical battery cell, so that a buffer space is formed between the corresponding position of the deformation part and the cylindrical battery cell.

[0018] From this analysis, it can be seen that through the deformation portion formed between the pole ear connection portion and the pole post connection portion, and the distance between the deformation portion and the end face of the pole ear side of the cylindrical battery cell in the present application is smaller than the distance between the pole post connection portion and the end face of the pole ear side of the cylindrical battery cell, so that a buffer space can be formed between the deformation portion and the cylindrical battery cell. When the equipment push rod lifts the cylindrical battery cell from the side of the cylindrical battery cell away from the pole ear, the pole post connection portion can abut against the pole post. In order to ensure a close fit between the pole post connection portion and the pole post, it is usually necessary to lift it up a certain distance and perform welding. Once the upward lifting generates a counter-pressure force, the deformation part will produce a certain degree of deformation, and because a buffer space is formed between the deformation part and the end face on the ear side of the cylindrical battery cell in the present application, the deformation of the deformation part can not only ensure the close fit between the pole connecting part and the pole, but also prevent the deformation part from fitting to the end face on the ear side of the cylindrical battery cell through the buffer space, thereby avoiding the problem of damage to the cylindrical battery cell to a certain extent.

[0019] In addition, the utility model also provides a cylindrical battery, including a cylindrical battery cell, a pole, a shell and the above-mentioned current collecting plate; the battery cell is arranged in the shell, the pole is arranged on the shell, the pole connecting part of the current collecting plate is in contact with the pole; the pole ear of the battery cell is in contact with the pole ear connecting part.

[0020] The cylindrical battery using the current collecting plate provided in the present application can avoid to the greatest extent during assembly the problem that the current collecting plate excessively squeezes the cylindrical battery cell under the action of reverse pressure, causing damage to the cylindrical battery cell and short circuit, thereby improving the production yield of the cylindrical battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A cross-sectional view of the assembly of the current collecting plate and the positive electrode of the cylindrical battery cell provided in an embodiment of the utility model;

[0023] Figure 2 A schematic structural diagram of a first embodiment of a current collecting plate provided in an embodiment of the utility model from a first viewing angle;

[0024] Figure 3 A structural schematic diagram of a first implementation manner of a current collecting plate provided in an embodiment of the utility model from a second viewing angle;

[0025] Figure 4A schematic structural diagram of a second implementation mode of a current collecting plate provided in an embodiment of the utility model from a first viewing angle;

[0026] Figure 5 A schematic structural diagram of a second embodiment of a current collecting plate provided in an embodiment of the utility model from a second viewing angle.

[0027] In the figure: 1-ear connection part; 2-deformation part; 201-hollow part; 202-buffer space; 203-transition part; 3-pole connection part; 4-reinforcement rib; 5-battery cell; 501-ear; 6-shell; 7-pole. DETAILED DESCRIPTION

[0028] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0029] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "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 connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0033] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0034] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0035] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0036] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0037] like Figure 1As shown, the utility model provides a collecting plate, which is arranged on the end face of the pole ear 501 side of the cylindrical battery cell 5, and includes a pole ear connecting portion 1, a deformation portion 2 and a pole column connecting portion 3; the deformation portion 2 is located between the pole ear connecting portion 1 and the pole column connecting portion 3, and along the height direction of the cylindrical battery cell 5, the distance between the deformation portion 2 and the end face of the pole ear 501 side of the cylindrical battery cell 5 is smaller than the distance between the pole column connecting portion 3 and the end face of the pole ear 501 side of the cylindrical battery cell 5, so that a buffer space 202 is formed between the corresponding position of the deformation portion 2 and the cylindrical battery cell 5.

[0038] Compared with the prior art, the collector provided by the utility model has the following advantages:

[0039] The current collecting plate provided by the utility model has a deformation portion 2 formed between the pole ear connection portion 1 and the pole column connection portion 3, and the distance between the deformation portion 2 and the end face of the pole ear 501 side of the cylindrical battery cell 5 in the present application is smaller than the distance between the pole column connection portion 3 and the end face of the pole ear 501 side of the cylindrical battery cell 5, so that a buffer space 202 can be formed between the deformation portion 2 and the cylindrical battery cell 5. When the equipment push rod lifts the cylindrical battery cell 5 from the side of the cylindrical battery cell 5 away from the pole ear 501, the pole column connection portion 3 can abut against the pole 7. In order to ensure the close fit between the pole column connection portion 3 and the pole 7, it is usually necessary to lift it up a certain distance and perform welding. Once the upward lifting generates a counter-pressure force, the deformation part 2 will produce a certain degree of deformation, and because a buffer space 202 is formed between the deformation part 2 and the end face on the side of the pole ear 501 of the cylindrical battery cell 5 in the present application, the deformation of the deformation part 2 can not only ensure the close fit between the pole connecting part 3 and the pole 7, but also prevent the deformation part 2 from fitting to the end face on the side of the pole ear 501 of the cylindrical battery cell 5 through the buffer space 202, thereby avoiding the problem of damage to the cylindrical battery cell 5 to a certain extent.

[0040] Based on the above structure, Figure 2 Combination Figure 3 As shown, an embodiment of a current collecting plate is provided, wherein the area of ​​the deformation portion 2 does not exceed 30% of the sum of the areas of the deformation portion 2 , the pole lug connection portion 1 and the pole connection portion 3 .

[0041] By ensuring that the area of ​​the deformation portion 2 does not exceed 30% of the sum of the areas of the deformation portion 2, the pole lug connection portion 1 and the pole column connection portion 3, it is possible to ensure to a certain extent that there is sufficient welding area between the pole lug connection portion 1 and the pole lug 501 to ensure the welding stability between the pole lug connection portion 1 and the pole lug 501.

[0042] In this embodiment, the deformation portion 2 provided in the present application has a thickness of 0.15 mm to 0.25 mm along the height direction of the cylindrical battery core 5 .

[0043] like Figure 2As shown, in this embodiment, the deformation portion 2 is arranged along the circumference of the pole connecting portion 3 and is in a complete circular ring structure with higher strength and stability. Therefore, by reducing the thickness of the deformation portion 2 in this embodiment, it is possible to ensure the stability of the overall collecting plate and the softness of the deformation portion 2, so that the deformation portion 2 can produce better deformation when receiving pressure, thereby ensuring sufficient compression of the buffer space 202 and improving the stability of the cylindrical battery cell 5.

[0044] Preferably, in this embodiment, along the height direction of the cylindrical battery cell 5, the difference in height between the surface of the deformation portion 2 facing the cylindrical battery cell 5 and the surface of the pole tab connection portion 1 facing the cylindrical battery cell 5 is 0.45mm-0.55mm; the difference in height between the surface of the pole tab connection portion 1 away from the cylindrical battery cell 5 and the surface of the deformation portion 2 away from the cylindrical battery cell 5 is 1.05mm-1.15mm.

[0045] In this way, through the height difference formed by the deformation part 2 and the pole lug connection part 1, the pole post connection part 3, the deformation part 2 and the pole lug connection part 1 can be made to have a gradually decreasing structural form in the height direction, thereby satisfying both the stable fitting and welding between the pole lug connection part 1 and the pole lug 501 and the stable fitting and welding between the pole post connection part 3 and the pole 7, and also ensuring that there is sufficient spacing between the deformation part 2 and the end face of the pole lug 501 side of the cylindrical battery cell 5, thereby forming a buffer space 202 to ensure that the deformation part 2 is fully deformed when subjected to force.

[0046] The second implementation method provided by this application is as follows: Figure 4 Combination Figure 5 As shown, in this embodiment, a plurality of hollow portions 201 are provided on the deformation portion 2, and the plurality of hollow portions 201 are evenly distributed along the circumference of the pole connection portion 3, and the two ends of the deformation portion 2 are respectively connected to the pole lug connection portion 1 and the pole connection portion 3.

[0047] By forming a plurality of hollow portions 201 on the deformation portion 2 and evenly distributing the plurality of hollow portions 201 along the circumference of the pole connecting portion 3 , it is possible to ensure that the force on the collector plate is more uniform, and on the other hand, it is possible to reduce the overall weight of the collector plate.

[0048] Preferably, if Figure 4 As shown, the area of ​​the plurality of hollow portions 201 in the present application is not greater than 50% of the sum of the area of ​​the hollow portion 201 and the area of ​​the deformation portion 2 .

[0049] The sum of the area of ​​the hollow portion 201 and the area of ​​the deformation portion 2 refers to the total area of ​​the circumferential region of the deformation portion 2, that is, the total area of ​​the current collecting disk which is circular in a plane state minus the areas of the pole ear connection portion 1 and the pole connection portion 3, and the area of ​​the hollow portion 201 does not exceed 50% of the total area of ​​the circumferential region of the deformation portion 2. On the one hand, this can ensure the structural strength of the current collecting disk in this embodiment and ensure the stable deformation of the deformation portion 2; on the other hand, it can also meet the current requirements.

[0050] Alternatively, if Figure 4 Combination Figure 5 As shown, the thickness of the deformation portion 2 in this embodiment is 0.35mm-0.45mm; the height difference between the surface of the deformation portion 2 facing the cylindrical battery cell 5 and the surface of the pole ear connection portion 1 facing the cylindrical battery cell 5 is 0.25mm-0.35mm; the height difference between the surface of the pole ear connection portion 1 away from the cylindrical battery cell 5 and the surface of the deformation portion 2 away from the cylindrical battery cell 5 is 1.05mm-1.15mm.

[0051] Since in the present embodiment, the deformation part 2 is in a strip-shaped structure, in order to ensure the strength of the deformation part 2, the thickness needs to be relatively increased. Therefore, by making the thickness of the deformation part 2 0.35mm-0.45mm, the strength of the deformation part 2 can be ensured, and the deformation part 2 can also be sufficiently deformed to achieve the above-mentioned function.

[0052] The height difference generated between the deformation part 2 and the pole lug connection part 1 can also enable the pole column connection part 3, the deformation part 2 and the pole lug connection part 1 of the collector provided in this embodiment to form a structure that decreases in height direction, so as to ensure that the pole lug connection part 1 is tightly fitted with the pole lug 501, and the pole column connection part 3 is tightly fitted with the pole 7, while the deformation part 2 has sufficient buffer space 202 to realize the above functions.

[0053] Preferably, the pole lug connection portion 1 , the deformation portion 2 and the pole connection portion 3 in the present application are integrally stamped and formed, and a transition portion 203 is further formed between the deformation portion 2 and the pole connection portion 3 .

[0054] like Figure 3 Combination Figure 5 As shown, in the above two embodiments, a transition portion 203 is formed between the pole connecting portion 3 and the deformation portion 2. The transition portion 203 formed between the pole connecting portion 3 and the deformation portion 2 can avoid the distance between the deformation portion 2 and the end face of the pole ear 501 side of the cylindrical battery cell 5 being too large, and can also ensure a smooth transition between the deformation portion 2 and the pole connecting portion 3.

[0055] Preferably, if Figure 2-Figure 5As shown, the current collecting plate provided by the utility model further includes a reinforcing rib 4 , which is multiple and formed on a side of the pole tab connecting portion 1 away from the cylindrical battery core 5 and evenly distributed along the circumference of the pole tab connecting portion 1 .

[0056] By forming a plurality of reinforcing ribs 4 on the side of the pole tab connection part 1 away from the cylindrical battery cell 5 and along the circumference of the pole tab connection part 1, the structural strength of the pole tab connection part 1 can be improved to a certain extent, thereby avoiding the problem of deformation of the pole tab connection part 1 when the deformation part 2 is compressed and deformed and welded.

[0057] It is necessary to add that, if Figure 2 Combination Figure 4 As shown, the number of reinforcing ribs 4 in the present application is three, and this is only one of the preferred implementations. On the basis of ensuring the strength of the tab connection portion 1, other numbers of reinforcing ribs 4 are also acceptable.

[0058] In addition, the utility model also provides a cylindrical battery, including a cylindrical battery cell 5, a pole 7, a shell 6, and the above-mentioned current collecting plate; the battery cell 5 is arranged in the shell 6, the pole 7 is arranged on the shell 6, the pole ear connecting portion 1 of the current collecting plate is in contact with the pole 7; the pole ear 501 of the battery cell 5 is in contact with the pole ear connecting portion 1.

[0059] The cylindrical battery using the current collecting plate provided in the present application can avoid to the greatest extent during assembly the current collecting plate from excessively squeezing the cylindrical battery cell 5 under the action of reverse pressure, thereby damaging the cylindrical battery cell 5 and causing a short circuit, thereby improving the production yield of the cylindrical battery.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A current collecting plate, arranged on the end face of a cylindrical battery cell (5) on the side of the pole ear, characterized in that: It comprises a pole lug connection portion (1), a deformation portion (2) and a pole connection portion (3); The deformation portion (2) is located between the pole lug connection portion (1) and the pole column connection portion (3); along the height direction of the cylindrical battery cell (5), the distance between the deformation portion (2) and the end face of the pole lug side of the cylindrical battery cell (5) is smaller than the distance between the pole column connection portion (3) and the end face of the pole lug side of the cylindrical battery cell (5), so that a buffer space (202) is formed between the corresponding position of the deformation portion (2) and the cylindrical battery cell (5).

2. The collecting plate according to claim 1, characterized in that: The area of ​​the deformation portion (2) does not exceed 30% of the sum of the areas of the deformation portion (2), the pole lug connection portion (1) and the pole connection portion (3).

3. The collecting plate according to claim 1, characterized in that: Along the height direction of the cylindrical battery core (5), the thickness of the deformation portion (2) is 0.15 mm-0.25 mm.

4. The collecting plate according to claim 1, characterized in that: Along the height direction of the cylindrical battery core (5), the height difference between the surface of the deformable portion (2) facing the cylindrical battery core (5) and the surface of the tab connecting portion (1) facing the cylindrical battery core (5) is 0.45 mm to 0.55 mm; The height difference between the surface of the tab connection portion (1) facing away from the cylindrical battery core (5) and the surface of the deformation portion (2) facing away from the cylindrical battery core (5) is 1.05 mm to 1.15 mm.

5. The collecting plate according to claim 1, characterized in that: The deformation portion (2) is provided with a plurality of hollow portions (201), and the plurality of hollow portions (201) are evenly distributed along the circumference of the pole connecting portion (3), and the two ends of the deformation portion (2) are respectively connected to the pole lug connecting portion (1) and the pole connecting portion (3).

6. The collecting plate according to claim 5, characterized in that: The area of ​​the plurality of hollow portions (201) is not greater than 50% of the sum of the area of ​​the hollow portions (201) and the area of ​​the deformation portion (2).

7. The collecting plate according to claim 5, characterized in that: The thickness of the deformation portion (2) is 0.35 mm to 0.45 mm; The height difference between the surface of the deformed portion (2) facing the cylindrical battery core (5) and the surface of the tab connecting portion (1) facing the cylindrical battery core (5) is 0.25 mm to 0.35 mm; The height difference between the surface of the tab connection portion (1) facing away from the cylindrical battery core (5) and the surface of the deformation portion (2) facing away from the cylindrical battery core (5) is 1.05 mm to 1.15 mm.

8. The collecting plate according to claim 1, characterized in that: The pole lug connection portion (1), the deformation portion (2) and the pole connection portion (3) are integrally stamped and formed, and a transition portion (203) is formed between the deformation portion (2) and the pole connection portion (3).

9. The collecting plate according to claim 1, characterized in that: It also includes a reinforcing rib (4), wherein the reinforcing rib (4) is multiple, and the multiple reinforcing ribs (4) are formed on the side of the pole lug connection portion (1) away from the cylindrical battery core (5), and are evenly distributed along the circumference of the pole lug connection portion (1).

10. A cylindrical battery, characterized in that: It comprises a cylindrical battery cell (5), a pole, a shell (6), and a current collecting plate as claimed in any one of claims 1 to 9; The battery core (5) is arranged in the shell (6), the pole is arranged on the shell (6), and the pole connecting portion (3) of the collector plate is in contact with the pole; The tab of the battery cell (5) is in contact with the tab connecting portion (1).

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