Collector plate for cylindrical power battery and cylindrical power battery

Abstract

The utility model discloses a collector plate for a cylindrical power battery and the cylindrical power battery. Wherein the current collecting disc comprises a main body part, one position of the edge of the main body part extends outwards and is bent to form an extension part which is overlapped on the upper side of the main body part, one surface, back to the extension part, of the main body part is configured to be welded with the roll core, and the extension part is configured to be welded to the inner side of the shell bottom through laser penetration welding. When laser penetration welding is carried out, the shell bottom is welded with the extension part instead of being directly welded with the main body part, so that the problem that a roll core is damaged when a single-layer current collecting plate is welded is avoided, and the laser penetration welding with a relatively large welding area is used for assembling the current collecting plate of the battery, so that the overflowing area of the battery is increased.

Description

Technical Field

[0001] The present technology relates to the field of new energy batteries, and in particular to a current collecting plate for a cylindrical power battery and a cylindrical power battery. Background Art

[0002] At present, lithium-ion or sodium-ion cylindrical power batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charging and discharging. With the popularization of new energy vehicles, people have put forward higher and higher requirements for fast charging travel (i.e., high-rate fast charging of power batteries) and high-seismic working conditions. However, the existing cylindrical power batteries are complicated in design because the collector plates commonly used in cylindrical power batteries are used to improve seismic resistance and flexibility, resulting in high battery production costs. And for cylindrical power batteries, when the shell bottom laser penetration welding is adopted, the existing single-layer collector plate assembly cannot avoid the problem of damaging the core. In addition, due to the rigid connection between the core, the collector plate and the shell bottom, the core is prone to large beating during loading and vibration, which makes the welding position directly impacted and prone to falling off, resulting in the risk of open circuit failure of the battery. In addition, cylindrical power batteries usually use the core center hole resistance welding method to weld the core to the shell bottom to avoid the problem of laser penetration welding damaging the core. However, the small welding area of ​​resistance welding leads to poor battery overcurrent capacity, which can no longer meet the high-rate charging and discharging. Utility Model Content

[0003] The present application aims to provide a current collecting plate structure and a cylindrical power battery, which can solve the technical problem in the above-mentioned background technology that the current collecting plate cannot avoid damaging the winding core when adopting shell bottom laser penetration welding.

[0004] To achieve the above-mentioned purpose, the present application provides a current collecting plate for a cylindrical power battery, including a main body portion, a position of an edge of the main body portion extends outward and is bent to form an extension portion stacked on the upper side of the main body portion, and a side of the main body portion facing away from the extension portion is configured to be welded to the winding core, and the extension portion is configured to be welded to the inner side of the shell bottom by laser penetration welding.

[0005] Optionally, a connecting arm protrudes outward from a position on the edge of the main body, the end of the connecting arm is bent to form a bending portion, the end of the bending portion extends out of the extending portion, and the connecting arm and the bending portion are flexibly deformable.

[0006] Optionally, the bending portion is U-shaped.

[0007] Optionally, the portion of the extension portion facing the main body portion is configured to completely cover the through hole of the winding core.

[0008] Optionally, the main body portion is strip-shaped, and both ends of the main body portion in the length direction are configured as full-tab welding areas, and the extending portion is connected to one edge of the main body portion in the width direction.

[0009] To achieve the above object, the present application further provides a cylindrical power battery, including a wound core, a housing, and the above current collector plate; the housing sleeves the wound core, and the current collector plate is welded to one end of the wound core close to the bottom of the housing; the extending portion is welded to the inner side of the bottom of the housing by laser penetration welding.

[0010] To achieve the above object, the present application further provides a current collector plate for a cylindrical power battery, including a main body portion. A first position on the edge of the main body portion extends outward and bends to form a first extending portion stacked on the upper side of the main body portion, and a second position on the edge of the main body portion extends outward and bends to form a second extending portion stacked on the upper side of the first extending portion. One side of the main body portion facing away from the first extending portion is configured to be welded to the wound core, and the second extending portion is configured to be welded to the inner side of the bottom of the housing by laser penetration welding.

[0011] Optionally, a first connecting arm protrudes outward from the first position on the edge of the main body portion. The end of the first connecting arm bends to form a first bending portion, and the end of the first bending portion extends out of the first extending portion. The first connecting arm and the first bending portion can be flexibly deformed.

[0012] Optionally, the first bending portion is U-shaped.

[0013] Optionally, a second connecting arm protrudes outward from the second position on the edge of the main body portion. The end of the second connecting arm bends to form a second bending portion, and the end of the second bending portion extends out of the second extending portion. The second connecting arm and the second bending portion can be flexibly deformed.

[0014] Optionally, the second bending portion is U-shaped.

[0015] Optionally, the portions of the second extending portion, the first extending portion, and the main body portion facing each other are configured to completely cover the through hole of the wound core.

[0016] Optionally, the main body portion includes a first edge and a second edge arranged oppositely. The first position is located at the first edge, and the second position is located at the second edge. The first position and the second position are arranged oppositely, and the first extending portion and the second extending portion extend towards each other.

[0017] Optionally, the main body portion is strip-shaped, and both ends of the main body portion in the length direction are configured as full-tab welding areas; the first edge and the second edge are the two edges of the main body portion in the width direction.

[0018] To achieve the above object, the present application also discloses a cylindrical power battery, which includes a wound core, a housing, and the current collector plate as described above; the housing sleeves the wound core, and the current collector plate is welded to one end of the wound core close to the bottom of the housing; the second extension part is welded to the inner side of the bottom of the housing by laser penetration welding.

[0019] In the embodiment of the present application, at least one extension part is stacked on the upper side of the main body part of the current collector plate. When performing laser penetration welding, the bottom of the housing is welded to the uppermost extension part, rather than directly welded to the main body part. Since the extension part welded to the bottom of the housing is stacked on the upper side of the main body part, the thickness of the welding part can be increased, which can avoid the problem that the wound core is damaged during welding of a single-layer current collector plate. Thus, laser penetration welding with a larger welding area can be used for the assembly of the battery current collector plate, which is beneficial to increasing the over-current area of the battery. Description of the Drawings

[0020] Figure 1 is a perspective structural view of the current collector plate in the embodiment of the present application.

[0021] Figure 2 is Figure 1 a cross-sectional view taken along line A-A in

[0022] Figure 3 is Figure 1 a top view of the current collector plate in

[0023] Figure 4 is a perspective structural view of the cylindrical power battery in the embodiment of the present application.

[0024] Figure 5 is Figure 4 a cross-sectional view taken along line B-B in

[0025] Figure 6 is Figure 4 a top view of the cylindrical power battery after removing the housing in

[0026] Figure 7 is a perspective structural view of the current collector plate in another embodiment of the present application.

[0027] Figure 8 is Figure 7 a side view of the current collector plate in

[0028] Figure 9 is Figure 7 a front view of the current collector plate in

[0029] Figure 10 is Figure 7 a top view of the current collector plate in

[0030] Figure 11 is a perspective structural view of the cylindrical power battery in another embodiment of the present application.

[0031] Figure 12 is Figure 11 A sectional view along the C-C line in the [specific component].

[0032] Figure 13 is Figure 11 A top view of a cylindrical power battery after removing the housing in the [specific component]. Detailed implementation manners

[0033] In order to elaborate in detail the technical content, structural features, achieved objectives and effects of the present application, the following will be described in detail in conjunction with the implementation manners and with reference to the accompanying drawings.

[0034] Embodiment 1

[0035] Please refer to Figures 1 to 6 , the present application discloses a current collector plate 1 for a cylindrical power battery, including a main body portion 11. A position at the edge of the main body portion 11 extends outward and is bent to form an extension portion 12 stacked on the upper side of the main body portion 11. The surface of the main body portion 11 facing away from the extension portion 12 is configured to be welded to the winding core 2, and the extension portion 12 is configured to be welded to the inner side of the bottom 31 of the housing 3 by laser penetration welding. During welding, a jig can pass through the through hole 21 of the winding core 2 to press against the main body portion 11, so that the main body portion 11 and the extension portion 12 are in close contact, and the extension portion 12 and the bottom 31 are in close contact. It can be understood that the "extension portion 12" here is not limited to the single-layer structure in the drawings, and it does not exclude that the extension portion 12 is at least two layers of structures folded back and forth. During welding, the main body portion 11 and the extension portion 12, the extension portion 12 and the bottom 31, and the various layers of the extension portion 12 are in close contact with each other.

[0036] Please refer to Figure 2 , if the current collector plate 1 has a uniform thickness and the thickness of the main body portion 11 is t, then during laser penetration welding, the thickness when the main body portion 11 and the single-layer extension portion 12 are in contact with each other is approximately T = 2t.

[0037] Specifically, a connecting arm 13 protrudes outward from a position on the edge of the main body 11. The end of the connecting arm 13 is bent to form a bent portion 14, and an extending portion 12 extends from the end of the bent portion 14. The connecting arm 13 and the bent portion 14 can be flexibly deformed. When the current collector plate 1 is welded to the bottom shell 31 by laser penetration welding, a fixture can pass through the through hole 21 of the winding core 2 and abut against the main body 11, so that the main body 11 and the extending portion 12 are in close contact. Since the connecting arm 13 and the bent portion 14 can be flexibly deformed, during the process of the main body 11 and the extending portion 12 being in close contact, the position of the bent portion 14 can be adjusted adaptively (the position changes), preventing the bent portion 14 from being flattened and affecting its stress release function. After the fixture is removed after welding, if the extending portion 12 and the main body 11 have been welded together, the bent portion 14 will normally remain in the position after the above-mentioned adaptive adjustment. Of course, the extending portion 12 and the main body 11 may not be welded together. At this time, after the fixture is removed, the position of the bent portion 14 may still change. In either case, since during the process of the main body 11 and the extending portion 12 being in close contact, the bent portion 14 only changes its position and is not flattened, then during subsequent vehicle loading vibrations, the bent portion 14 can effectively play its role of releasing stress through flexible deformation, and can effectively reduce the risk of open circuit at the welding joint between the extending portion 12 and the bottom shell 31.

[0038] Please refer to Figure 2 , further, the bent portion 14 is U-shaped. Of course, the bent portion 14 is not limited to being U-shaped.

[0039] Please refer to Figure 3 , in a specific example, the distance between the starting end and the ending end of the connecting arm 13 is W≥1 mm.

[0040] Please refer to Figure 4 and Figure 5 , specifically, the portions of the extending portion 12 and the main body 11 facing each other are configured to completely cover the through hole 21 of the winding core 2. During welding, the welding fixture can abut against the main body 11 through the through hole 21 to make the extending portion 12 and the main body 11 fit together.

[0041] Please refer to Figure 3 and Figure 6 , specifically, the main body 11 is strip-shaped, and both ends of the main body 11 in the length direction are configured as full tab welding areas 111, and the extending portion 12 is connected to one edge of the main body 11 in the width direction.

[0042] Please refer to Figure 3 , optionally, the distance L between the projection of the end edge of the extending portion 12 on the main body 11 and the other edge of the main body 11 in the width direction is L≤1 mm.

[0043] Optionally, the material of the current collector plate 1 can be copper, nickel-plated copper, or copper-nickel composite tape, etc.

[0044] In an embodiment of the present application, the current collector plate 1 includes a main body portion 11. A position on the edge of the main body portion 11 extends outward and is bent to form an extension portion 12 stacked on the upper side of the main body portion 11. The side of the main body portion 11 facing away from the extension portion 12 is configured to be welded to the core 2, and the extension portion 12 is configured to be welded to the inner side of the bottom 31 of the shell by laser penetration welding. When performing laser penetration welding, the bottom 31 of the shell is welded to the extension portion 12, rather than directly welded to the main body portion 11. Since the extension portion 12 is stacked on the upper side of the main body portion 11, the thickness of the welding portion can be increased, and the problem that the core 2 is damaged during welding of a single-layer current collector plate can be avoided. Thus, laser penetration welding with a larger welding area can be used for the assembly of the battery current collector plate, which is beneficial to increasing the current-carrying area of the battery.

[0045] Embodiment Two

[0046] Please refer to Figures 1 to 6 , the present application also discloses a cylindrical power battery, including a core 2, a shell 3, and the above-mentioned current collector plate 1. The shell 3 sleeves the core 2, and one end of the core 2 close to the bottom 31 of the shell 3 is welded with the current collector plate 1. The extension portion 12 is welded to the inner side of the bottom 31 of the shell by laser penetration welding.

[0047] Optionally, the welding track between the extension portion 12 and the bottom 31 of the shell is one or more concentric rings. The concentric rings can be circular rings, rectangular rings, elliptical rings, etc., without limitation.

[0048] Optionally, the welding track of the full-tab welding area 111 is one or more strip-shaped welding tracks.

[0049] The following briefly describes the optional assembly process of the cylindrical power battery:

[0050] First, the copper foil full tab 22 (not limited to copper foil) of the core 2 is pre-treated by flattening or patting.

[0051] Then, the copper foil full tab 22 of the core 2 is attached to the main body portion 11, and the current collector plate 1 and the core through hole 21 are aligned.

[0052] Then, the full-tab welding area 111 and the copper foil full tab 22 are fixed by laser welding.

[0053] Then, the core 2 is inserted into the shell 3 so that the current collector plate 1 faces the bottom 31 of the shell.

[0054] Then, a welding fixture is used to hold the core 2 and pass through the core through hole 21 to hold the current collector plate 1, so that the extension portion 12 is attached to the bottom 31 of the shell and the extension portion 12 is attached to the main body portion 11. At this time, the connecting arm 13 and the bending portion 14 will be stressed and undergo flexible deformation, and the position of the bending portion 14 will change adaptively to prevent the bending portion 14 from being flattened.

[0055] Then, laser penetration welding is performed from the outside of the bottom case 31 to weld and fix the extension portion 12 to the bottom case 31.

[0056] Finally, other steps are carried out, which are well-known to those skilled in the art and will not be elaborated here.

[0057] In the embodiment of the present application, the current collector plate 1 includes a main body portion 11. A position on the edge of the main body portion 11 extends outward and is bent to form an extension portion 12 stacked on the upper side of the main body portion 11. The side of the main body portion 11 facing away from the extension portion 12 is welded to the winding core 2, and the extension portion 12 is welded to the inside of the bottom case 31 by laser penetration welding. When performing laser penetration welding, the bottom case 31 is welded to the extension portion 12, rather than directly welded to the main body portion 11. Since the extension portion 12 is stacked on the upper side of the main body portion 11, the thickness of the welding area can be increased, and the problem that the winding core 2 may be damaged during welding of a single-layer current collector plate can be avoided. Thus, laser penetration welding with a larger welding area can be used for the assembly of the battery current collector plate, which is beneficial to increasing the current-carrying area of the battery.

[0058] Embodiment Three

[0059] Please refer to Figures 7 to 12 , the present application also discloses a current collector plate 4 for a cylindrical power battery, including a main body portion 41. A first position 42 on the edge of the main body portion 41 extends outward and is bent to form a first extension portion 43 stacked on the upper side of the main body portion 41. A second position 44 on the edge of the main body portion 41 extends outward and is bent to form a second extension portion 45 stacked on the upper side of the first extension portion 43. The side of the main body portion 41 facing away from the first extension portion 43 is configured to be welded to the winding core 5, and the second extension portion 45 is configured to be welded to the inside of the bottom case 61 by laser penetration welding.

[0060] Please refer to Figure 8 and Figure 9 , if the current collector plate 4 has a uniform thickness and the thickness of the main body portion 41 is t, then when performing laser penetration welding, the thickness when the main body portion 11, the first extension portion 43, and the second extension portion 45 are attached together is approximately T = 3t.

[0061] Please refer to Figure 9 , specifically, a first connecting arm 46 protrudes outward from the first position 42 on the edge of the main body portion 41. The end of the first connecting arm 46 is bent to form a first bending portion 47, and the end of the first bending portion 47 extends to form the first extension portion 43. The first connecting arm 46 and the first bending portion 47 can be flexibly deformed.

[0062] Furthermore, the first bending portion 47 is U-shaped.

[0063] Please refer to Figure 10, optionally, the distance L between the projection of the end edge of the first extension portion 43 on the main body portion 41 and the second position 44 1 ≤ 1 mm.

[0064] Optionally, the distance between the starting end and the ending end of the first connecting arm 46 is W 1 ≥ 1 mm.

[0065] Please refer to Figure 9 , specifically, a second connecting arm 48 protrudes outward from the second position 44 on the edge of the main body portion 41. The end of the second connecting arm 48 is bent to form a second bending portion 49, and the end of the second bending portion 49 extends to form a second extension portion 45. The second connecting arm 48 and the second bending portion 49 can be flexibly deformed.

[0066] Specifically, the second bending portion 49 is U-shaped.

[0067] Optionally, the distance L between the projection of the end edge of the second extension portion 45 on the main body portion 41 and the first position 42 2 ≤ 1 mm.

[0068] Optionally, the distance between the starting end and the ending end of the second connecting arm 48 is W 2 ≥ 1 mm.

[0069] Specifically, the portions of the second extension portion 45, the first extension portion 43 and the main body portion 41 facing each other are configured to completely cover the through hole 51 of the core 5.

[0070] When performing laser welding, a welding fixture can pass through the through hole 51 of the core 5 and press against the main body portion 41, so that the second extension portion 45, the first extension portion 43 and the main body portion 41 are attached to each other. Since the first connecting arm 46, the first bending portion 47, the second connecting arm 48 and the second bending portion 49 can be flexibly deformed, during the process of attaching the second extension portion 45, the first extension portion 43 and the main body portion 41, the positions of the first bending portion 47 and the second bending portion 49 change adaptively, preventing the first bending portion 47 and the second bending portion 49 from being flattened and affecting their stress release function. After the fixture is removed after welding, if the second extension portion 45, the first extension portion 43 and the main body portion 41 have been welded together, the first bending portion 47 and the second bending portion 49 will normally remain in the position after the above-mentioned adaptive change. Of course, this is not limited to this. For example, it is also possible that only the second extension portion 45 and the first extension portion 43 are welded together. After the fixture is removed, the positions of the first bending portion 47 and the second bending portion 49 may still change. However, in any case, the first bending portion 47 and the second bending portion 49 only change their positions adaptively during the welding process and are not flattened. During subsequent vehicle loading and vibration, the first bending portion 47 and the second bending portion 49 can still play the role of releasing their own stress, effectively reducing the risk of an open circuit between the second extension portion 45 and the bottom of the shell 61.

[0071] Specifically, the main body portion 41 includes a first edge 411 and a second edge 412 which are oppositely arranged. The first position 42 is located at the first edge 411, the second position 44 is located at the second edge 412, the first position 42 and the second position 44 are oppositely arranged, and the first extension portion 43 and the second extension portion 45 extend towards each other.

[0072] Optionally, the material of the current collector plate 1 can be copper, nickel-plated copper, copper-nickel composite tape, etc.

[0073] Please refer to Figure 7 、 Figure 10 and Figure 13 , specifically, the main body portion 41 is strip-shaped, and both ends of the main body portion 41 in the length direction are configured as full-tab welding areas 413. The first edge 411 and the second edge 412 are the two edges of the main body portion 41 in the width direction.

[0074] In this application, the current collector plate 4 includes a main body portion 41. A first position 42 on the edge of the main body portion 41 extends outward and is bent to form a first extension portion 43 stacked on the upper side of the main body portion 41. A second position 44 on the edge of the main body portion 41 extends outward and is bent to form a second extension portion 45 stacked on the upper side of the first extension portion 43. One side of the main body portion 41 facing away from the first extension portion 43 is configured to be welded to the winding core 5, and the second extension portion 45 is configured to be welded to the inner side of the bottom case 61 by laser penetration welding. When performing laser penetration welding, the bottom case 31 is welded to the second extension portion 45, rather than directly welded to the main body portion 41. Stacking the second extension portion 45 and the first extension portion 43 on the upper side of the main body portion can increase the thickness of the welding area, avoiding the problem that the winding core 2 will be damaged during welding of a single-layer current collector plate. Thus, laser penetration welding with a larger welding area can be used for the assembly of the battery current collector plate, increasing the current-carrying area of the battery.

[0075] Embodiment 4

[0076] Please refer to Figures 7 to 13 , this application also discloses a cylindrical power battery, including a winding core 5, a housing 6, and the above-mentioned current collector plate 4. The housing 6 sleeves the winding core 5, and one end of the winding core 5 close to the bottom case 61 of the housing 6 is welded with the current collector plate 4. The second extension portion 45 is welded to the inner side of the bottom case 61 by laser penetration welding.

[0077] Optionally, the welding track between the second extension portion 45 and the bottom case 61 is one or more concentric rings. The concentric rings can be circular rings, rectangular rings, elliptical rings, etc., without limitation.

[0078] Optionally, the welding track of the full-tab welding area 413 is one or more strip-shaped welding tracks.

[0079] The following briefly describes the optional assembly process of the cylindrical power battery:

[0080] First, perform a flattening or patting pretreatment on the copper foil full tab 52 (not limited to copper foil) of the core 5.

[0081] Then, attach the copper foil full tab 52 of the core 5 to the main body 41, and align the current collector plate 4 with the core through hole 51.

[0082] Then, laser weld and fix the full tab welding area 413 to the copper foil full tab 52.

[0083] Then, insert the core 5 into the housing 6, with the current collector plate 4 facing the bottom 61 of the housing.

[0084] Then, use a welding fixture to press against the core 5 and pass through the core through hole 51 to press against the current collector plate 4, so that the second extension 45 is attached to the bottom 61 of the housing, and the main body 41, the first extension 43, and the second extension 45 are attached to each other. At this time, the first connecting arm 46 and the second connecting arm 48 will undergo flexible deformation under force, and the positions of the first bending portion 47 and the second bending portion 49 will change adaptively to prevent the first bending portion 47 and the second bending portion 49 from being flattened.

[0085] Then, perform laser penetration welding from the outside of the bottom 61 of the housing to weld and fix the second extension 45 to the bottom 61 of the housing.

[0086] Finally, perform other welding steps, which are well-known steps to those skilled in the art and will not be elaborated here.

[0087] In the embodiment of the present application, the current collector plate 4 includes a main body 41. The first position 42 on the edge of the main body 41 extends outward and bends to form a first extension 43 stacked on the upper side of the main body 41. The second position 44 on the edge of the main body 41 extends outward and bends to form a second extension 45 stacked on the upper side of the first extension 43. The side of the main body 41 facing away from the first extension 43 is welded to the core 5, and the second extension 45 is welded to the inner side of the bottom 61 of the housing through laser penetration welding. When performing laser penetration welding, the bottom 31 of the housing is welded to the second extension 45, rather than directly welded to the main body 41. Stacking the second extension 45 and the first extension 43 on the upper side of the main body can increase the thickness of the welding area, avoiding the problem that the single-layer current collector plate may damage the core 2 during welding. Thus, laser penetration welding with a larger welding area can be used for the assembly of the battery current collector plate, increasing the overcurrent area of the battery.

[0088] The above-disclosed are only the preferred examples of the present application and cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application all fall within the scope covered by the present application.

Claims

1. A current collecting plate for a cylindrical power battery, characterized in that: It includes a main body, a position of the edge of the main body extends outward and is bent to form an extension portion stacked on the upper side of the main body, the side of the main body facing away from the extension portion is configured to be welded to the winding core, and the extension portion is configured to be welded to the inner side of the shell bottom by laser penetration welding.

2. The collecting plate according to claim 1, characterized in that: A connecting arm protrudes outward from a position on the edge of the main body, the end of the connecting arm is bent to form a bent portion, the end of the bent portion extends out of the extending portion, and the connecting arm and the bent portion are flexibly deformable.

3. The collecting plate according to claim 1, characterized in that: The main body is in a strip shape, both ends of the main body in the length direction are configured as full-tab welding areas, and the extension portion is connected to an edge of the main body in the width direction.

4. A cylindrical power battery, characterized in that: It comprises a winding core, a shell and a collecting plate as described in any one of claims 1 to 3; the shell is sleeved with the winding core, and the collecting plate is welded to one end of the winding core close to the shell bottom of the shell; the extension is welded to the inner side of the shell bottom by laser penetration welding.

5. A current collecting plate for a cylindrical power battery, characterized in that: It includes a main body portion, a first position of an edge of the main body portion extends outward and is bent to form a first extension portion stacked on the upper side of the main body portion, a second position of an edge of the main body portion extends outward and is bent to form a second extension portion stacked on the upper side of the first extension portion, a side of the main body portion facing away from the first extension portion is configured to be welded to the winding core, and the second extension portion is configured to be welded to the inner side of the shell bottom by laser penetration welding.

6. The collecting plate according to claim 5, characterized in that: A first connecting arm protrudes outward from a first position of the edge of the main body, a terminal end of the first connecting arm is bent to form a first bending portion, a terminal end of the first bending portion extends out the first extending portion, and the first connecting arm and the first bending portion are flexibly deformable.

7. The collecting plate according to claim 5 or 6, characterized in that: A second connecting arm protrudes outward from a second position of the edge of the main body, the end of the second connecting arm is bent to form a second bending portion, the end of the second bending portion extends out the second extending portion, and the second connecting arm and the second bending portion are flexibly deformable.

8. The collecting plate according to claim 5, characterized in that: The main body includes a first edge and a second edge that are arranged opposite to each other, the first position is located at the first edge, the second position is located at the second edge, the first position and the second position are arranged opposite to each other, and the first extension portion and the second extension portion extend toward each other.

9. The collecting plate according to claim 8, characterized in that: The main body is in a strip shape, and both ends of the main body in the length direction are configured as full-ear welding areas; the first edge and the second edge are two edges of the main body in the width direction.

10. A cylindrical power battery, characterized in that: It comprises a winding core, a shell and a collecting plate as described in any one of claims 5 to 9; the shell is sleeved with the winding core, and the collecting plate is welded to one end of the winding core close to the shell bottom of the shell; the second extension is welded to the inner side of the shell bottom by laser penetration welding.

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