Battery cell structure and full-tab cylindrical battery

Abstract

The utility model provides a battery cell structure and a full-tab cylindrical battery. The battery cell structure comprises a diaphragm, two current collecting plates and two pole pieces. And the empty foil areas of the two pole pieces are respectively arranged at two ends of the roll core in a protruding manner. The two current collecting disc bodies cover the empty foil areas of the corresponding pole pieces respectively, each vortex-shaped crimping piece is connected to the side, away from the winding core, of the current collecting disc body, the thread pitch of each vortex-shaped receding hole is the same as the thread pitch of the vortex-shaped crimping piece, each vortex-shaped crimping piece is arranged close to the vortex-shaped receding hole, and the vortex-shaped receding hole is communicated with the corresponding vortex-shaped crimping piece. Each empty foil area penetrates through the vortex-shaped clearance hole and is arranged close to the vortex-shaped crimping sheet, each vortex-shaped crimping sheet is collected at one side, far away from the winding core, of the current collecting disc body, and at least part of each empty foil area is clamped between the current collecting disc body and the vortex-shaped crimping sheet. According to the battery cell structure, accumulation of metal scraps generated by the tabs can be reduced, and stable contact between any tab and the collector plate during welding can be well ensured, so that the performance of the lithium ion battery is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery core structure and a full-ear cylindrical battery. Background Art

[0002] Lithium-ion batteries are widely used in mobile power devices due to their high energy density, high voltage and long cycle life.

[0003] In the traditional lithium-ion battery preparation process, the positive electrode ear is welded on the positive electrode sheet, and the negative electrode ear is welded on the negative electrode sheet. The positive and negative electrode ear structure facilitates connection with the outside world for charging and discharging. However, the positive and negative electrode ears are often welded at the beginning and end of the corresponding positive and negative electrode sheets. Therefore, the electron transmission path is longer, resulting in a large internal resistance of the assembled battery, which reduces the performance of the lithium-ion battery. In this way, full-ear positive and negative electrode sheets have been developed, such as the Chinese invention patent application with application number 202210614515.5, which discloses a lithium-ion battery with full-ear positive and negative electrode sheets, but the electrode ears need to be flattened to form a plane before the current collecting plate can be welded. In the process of flattening the electrode ears, metal debris is easily generated. Once the generated metal debris accumulates, it will cause the lithium-ion battery to short-circuit and fail, such as the Chinese invention patent application with application number 202310452143.5 The invention patent application provides at least one circle of annular grooves on the surface of the current collecting disk facing the winding core, and the annular groove is provided with a guide groove surface. The end of the pole ear away from the winding core is bent and forms a curved portion whose surface is in contact with the corresponding guide groove surface, so that when the pole ear enters the annular groove, it can naturally bend along the direction of the guide groove surface and keep in contact with the guide groove surface, thereby making the top of the pole ear bend to form a curved portion, and the curved portion of the pole ear is in contact with the guide groove surface, so that the pole ear can maintain good contact with the current collecting disk and have a large contact area. However, it is actually difficult to ensure that any pole ear can have a large contact area with the current collecting disk. For example, the pole ear corresponding to the outermost side of the guide groove surface is not in contact with the current collecting disk, or the contact area is small, which makes it difficult to ensure that all the pole ears can be in stable contact with the current collecting disk during welding, thereby affecting the performance of the lithium-ion battery. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a battery cell structure and a full-ear cylindrical battery that can reduce the accumulation of metal debris generated by the pole ear and better ensure the stable contact between any pole ear and the collecting plate during welding, thereby ensuring the performance of the lithium-ion battery.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A battery core structure, comprising a diaphragm, two current collecting disks and two pole pieces, each of the pole pieces comprising a linearly connected empty foil area and a coated area, wherein the coated area of ​​one pole piece, the diaphragm and the coated area of ​​the other pole piece are sequentially stacked and spirally wound to form a winding core, the empty foil areas of the two pole pieces are respectively protrudingly arranged at the two ends of the winding core, each of the current collecting disks comprises a current collecting disk body and a spiral pressing piece, the current collecting disk bodies of the two current collecting disks are respectively arranged at the two ends of the winding core in a one-to-one correspondence and are respectively covered on the empty foil areas of the corresponding pole pieces, the spiral pressing piece of each current collecting disk is connected to the side of the corresponding current collecting disk body away from the winding core, and each A vortex air-avoiding hole is provided on the collecting disk body of a current collecting disk, the pitch of the vortex air-avoiding hole of the collecting disk body of each current collecting disk is the same as the pitch of the corresponding vortex pressing piece, the vortex pressing piece of each current collecting disk is arranged adjacent to the corresponding vortex air-avoiding hole, the empty foil area of ​​each pole piece is penetrated through the corresponding vortex air-avoiding hole and arranged adjacent to the corresponding vortex pressing piece, the vortex pressing piece of each current collecting disk is converged to the side of the corresponding current collecting disk body away from the winding core, and the empty foil area of ​​each pole piece is at least partially sandwiched between the corresponding current collecting disk body and the corresponding vortex pressing piece.

[0007] In one embodiment, the spirally crimped sheet is a spirally crimped nickel foil or a spirally crimped aluminum foil.

[0008] In one embodiment, the empty foil area of ​​each pole piece is cut to form a plurality of closely arranged pole ears, one end of each of the pole ears is connected to the same side of the corresponding coating area, the plurality of pole ears of the empty foil area of ​​each pole piece are independently passed through the corresponding vortex air avoidance holes and are arranged adjacent to the corresponding vortex crimping sheet, and the plurality of pole ears of the empty foil area of ​​each pole piece are at least partially sandwiched between the corresponding current collecting plate body and the corresponding vortex crimping sheet.

[0009] In one embodiment, a slurry layer is attached to at least one of the two opposite side surfaces of the coating area of ​​each pole piece.

[0010] In one embodiment, slurry layers are attached to two opposite sides of the coating area of ​​each pole piece.

[0011] In one of the embodiments, the slurry layer attached to the coating area of ​​one of the pole pieces is a positive electrode active slurry layer, and the slurry layer attached to the coating area of ​​the other pole piece is a negative electrode active slurry layer.

[0012] In one embodiment, the spiral pressing piece of each current collecting disk is riveted to the corresponding current collecting disk body, so that the spiral pressing piece of each current collecting disk is gathered at a side of the corresponding current collecting disk body away from the winding core.

[0013] In one embodiment, the current collecting plate body of each current collecting plate and the corresponding vortex pressing piece are an integrally formed structure.

[0014] In one embodiment, the hollow foil area and the corresponding coating area of ​​each pole piece are an integrally formed structure.

[0015] A full-ear cylindrical battery comprises an outer shell and a battery cell structure as described in any of the above embodiments, wherein the winding core is arranged in the outer shell, and a side of the current collecting plate body of the two current collecting plates away from the winding core and a side of the corresponding spiral crimping sheet away from the winding core are both insulated and connected to the inner wall of the outer shell, and the current collecting plate bodies of the two current collecting plates are respectively at least partially exposed at both ends of the outer shell.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] The battery cell structure of the utility model allows the empty foil area of ​​each pole piece to serve as a full pole ear, thereby better ensuring the performance of the lithium-ion battery. Furthermore, the empty foil area of ​​each pole piece is penetrated through the corresponding spiral air-avoiding hole and arranged adjacent to the corresponding spiral crimping sheet, so that the full pole ear of each pole piece is at least partially protruded through the spiral air-avoiding hole and arranged on the side of the current collecting disk body away from the winding core. Furthermore, the spiral crimping sheet of each current collecting disk is converged on the side of the corresponding current collecting disk body away from the winding core, and the empty foil area of ​​each pole piece is at least partially sandwiched between the corresponding current collecting disk body and the corresponding spiral crimping sheet, so that the full pole ear protruding from the current collecting disk body is pressed against the side surface of the current collecting disk body away from the winding core through the spiral crimping sheet, thereby better ensuring the stable contact between any pole ear and the current collecting disk during welding, and only the full pole ear on the side of the current collecting disk body away from the winding core is flattened, which better reduces the accumulation of metal debris generated by the full pole ear at the winding core, thereby better ensuring the performance of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1This is a schematic structural diagram of a battery cell structure according to one embodiment of the utility model;

[0020] Figure 2 for Figure 1 A partial view of the cell structure shown;

[0021] Figure 3 for Figure 1 A partial cross-sectional view of the cell structure shown;

[0022] Figure 4 for Figure 1 A schematic diagram of the structure of the battery cell structure before riveting;

[0023] Figure 5 for Figure 4 A cross-sectional view of the cell structure shown. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] The present application provides a battery cell structure. The battery cell structure includes a diaphragm, two current collecting plates and two pole pieces. Each pole piece includes a linearly connected empty foil area and a coated area, wherein the coated area of ​​one pole piece, the diaphragm and the coated area of ​​the other pole piece are sequentially stacked and spirally wound to form a winding core, and the empty foil areas of the two pole pieces are respectively protrudingly arranged at both ends of the winding core. Each current collecting disk includes a current collecting disk body and a spiral pressing sheet. The current collecting disk bodies of the two current collecting disks are respectively arranged at the two ends of the winding core and respectively cover the empty foil areas of the corresponding pole pieces. The spiral pressing sheet of each current collecting disk is connected to the side of the corresponding current collecting disk body away from the winding core, and a spiral air-avoiding hole is opened on the current collecting disk body of each current collecting disk. The pitch of the spiral air-avoiding hole of the current collecting disk body of each current collecting disk is the same as the pitch of the corresponding spiral pressing sheet. The spiral pressing sheet of each current collecting disk is arranged adjacent to the corresponding spiral air-avoiding hole, the empty foil area of ​​each pole piece is penetrated through the corresponding spiral air-avoiding hole and arranged adjacent to the corresponding spiral pressing sheet. The spiral pressing sheet of each current collecting disk is converged to the side of the corresponding current collecting disk body away from the winding core, and the empty foil area of ​​each pole piece is at least partially sandwiched between the corresponding current collecting disk body and the corresponding spiral pressing sheet.

[0028] The above-mentioned battery cell structure allows the empty foil area of ​​each pole piece to serve as a full pole ear, thereby better ensuring the performance of the lithium-ion battery. Furthermore, the empty foil area of ​​each pole piece is passed through the corresponding spiral air-avoiding hole and is arranged adjacent to the corresponding spiral crimping sheet, so that the full pole ear of each pole piece is at least partially protruded through the spiral air-avoiding hole on the side of the current collecting disk body away from the winding core. Furthermore, the spiral crimping sheet of each current collecting disk is converged on the side of the corresponding current collecting disk body away from the winding core, and the empty foil area of ​​each pole piece is at least partially sandwiched between the corresponding current collecting disk body and the corresponding spiral crimping sheet, so that the full pole ear protruding from the current collecting disk body is pressed against the side surface of the current collecting disk body away from the winding core through the spiral crimping sheet, thereby better ensuring the stable contact between any pole ear and the current collecting disk during welding, and only the full pole ear on the side of the current collecting disk body away from the winding core is flattened, which better reduces the accumulation of metal debris generated by the full pole ear at the winding core, thereby better ensuring the performance of the lithium-ion battery.

[0029] In order to better understand the battery cell structure of the present application, the battery cell structure of the present application is further explained below:

[0030] Please also read Figures 1 to 5The cell structure 10 of one embodiment includes a diaphragm 100, two current collecting plates 200 and two pole pieces 300. Each pole piece 300 includes a linearly connected empty foil area 310 and a coated area 320, wherein the coated area 320 of one pole piece 300, the diaphragm 100 and the coated area 320 of the other pole piece 300 are sequentially stacked and spirally wound to form a winding core 10A, and the empty foil areas 310 of the two pole pieces 300 are respectively protrudingly arranged at both ends of the winding core 10A. Each current collecting disk 200 includes a current collecting disk body 210 and a spiral pressing piece 220. The current collecting disk bodies 210 of the two current collecting disks 200 are respectively arranged at the two ends of the winding core 10A and are respectively covered on the empty foil area 310 of the corresponding pole piece 300. The spiral pressing piece 220 of each current collecting disk 200 is connected to the side of the corresponding current collecting disk body 210 away from the winding core 10A, and the current collecting disk body 210 of each current collecting disk 200 is provided with a spiral avoiding hole 201. The pitch of the spiral avoiding hole 201 of the current collecting disk body 210 of each current collecting disk 200 is The spiral crimping sheet 220 of each current collecting disk 200 has the same pitch as the corresponding spiral crimping sheet 220, and is arranged adjacent to the corresponding spiral air-avoiding hole 201. The empty foil area 310 of each pole piece 300 passes through the corresponding spiral air-avoiding hole 201 and is arranged adjacent to the corresponding spiral crimping sheet 220. The spiral crimping sheet 220 of each current collecting disk 200 is converged to the side of the corresponding current collecting disk body 210 away from the winding core 10A, and the empty foil area 310 of each pole piece 300 is at least partially sandwiched between the corresponding current collecting disk body 210 and the corresponding spiral crimping sheet 220.

[0031] The above-mentioned battery cell structure 10 allows the empty foil area 310 of each pole piece 300 to serve as a full pole ear, which better ensures the performance of the lithium-ion battery. Further, the empty foil area 310 of each pole piece 300 is penetrated through the corresponding spiral air-avoiding hole 201 and is arranged adjacent to the corresponding spiral pressing piece 220, that is, the full pole ear of each pole piece 300 is at least partially protruded through the spiral air-avoiding hole 201 and is arranged on the side of the collecting disk body 210 away from the winding core 10A. Further, the spiral pressing piece 220 of each collecting disk 200 is converged on the side of the corresponding collecting disk body 210 away from the winding core 10A, and each The empty foil area 310 of the pole piece 300 is at least partially sandwiched between the corresponding current collecting disk body 210 and the corresponding spiral crimping sheet 220, that is, the full pole ear protruding from the current collecting disk body 210 is further pressed against the side surface of the current collecting disk body 210 away from the winding core 10A through the spiral crimping sheet 220, which better ensures the stable contact between any pole ear and the current collecting disk 200 during welding, and only the full pole ear on the side of the current collecting disk body 210 away from the winding core 10A is flattened, which better reduces the accumulation of metal debris generated by the full pole ear at the winding core 10A, thereby better ensuring the performance of the lithium-ion battery.

[0032] In one embodiment, the spirally crimped sheet is a spirally crimped nickel foil or a spirally crimped aluminum foil, which better ensures stable electrical contact between the empty foil area of ​​each pole piece and the corresponding current collecting disk, thereby better ensuring the performance of the lithium-ion battery.

[0033] Please also read Figures 1 to 5 In one embodiment, the empty foil area 310 of each pole piece 300 is cut to form a plurality of closely arranged pole ears 311, one end of each of the plurality of pole ears 311 is connected to the same side of the corresponding coating area 320, and the plurality of pole ears 311 of the empty foil area 310 of each pole piece 300 are independently passed through the corresponding vortex-shaped air-avoiding hole 201 and are arranged adjacent to the corresponding vortex-shaped pressing sheet 220, and the plurality of pole ears 311 of the empty foil area 310 of each pole piece 300 are at least partially sandwiched between the corresponding current collecting plate body 210 and the corresponding vortex-shaped pressing sheet 220. It should be noted that the plurality of pole ears 311 are arranged along the extension direction of the spiral air-avoiding groove, that is, the empty foil area 310 is cut in a cutting direction perpendicular to the length direction of the empty foil area 310, so that the empty foil area 310 is cut to form a plurality of pole ears 311, and one end of the plurality of pole ears 311 close to the coating area 320 is connected to the coating area 320, and any pole ear 311 is independently inserted into any adjacent spiral air-avoiding groove, so that any pole ear 311 is independently protruded and arranged on the side of the collecting disk body 210 away from the winding core 10A, at this time, the spiral crimping sheet 220 During the closing process, that is, when the spiral crimping sheet 220 is riveted to the side of the collecting disc body 210 away from the winding core 10A, all the pole ears 311 protruding from the side of the collecting disc body 210 away from the winding core 10A are gradually pressed together on the side surface of the collecting disc body 210 away from the winding core 10A, thereby better ensuring the pressing stability of all the pole ears 311 on the collecting disc body 210, and further better ensuring the stable electrical contact between all the pole ears 311 of each pole piece 300 and the corresponding collecting disc 200, thereby better ensuring the performance of the lithium-ion battery.

[0034] In one embodiment, at least one of the two opposite sides of the coating area of ​​each pole piece is attached with a slurry layer. Further, the two opposite sides of the coating area of ​​each pole piece are attached with a slurry layer, which better ensures the energy density of the lithium-ion battery. Further, the slurry layer attached to the coating area of ​​one pole piece is a positive electrode active slurry layer, and the slurry layer attached to the coating area of ​​the other pole piece is a negative electrode active slurry layer.

[0035] In one of the embodiments, the spiral crimping sheet of each current collecting disk is riveted to the corresponding current collecting disk body so that the spiral crimping sheet of each current collecting disk is gathered on the side of the corresponding current collecting disk body away from the winding core, thereby better ensuring the spiral crimping sheet's pressing effect on the empty foil area of ​​the corresponding pole piece on the current collecting disk body, thereby ensuring stable electrical contact between the empty foil area of ​​each pole piece and the corresponding current collecting disk, thereby better ensuring the performance of the lithium-ion battery.

[0036] In one of the embodiments, the collector body of each collector disc and the corresponding spiral crimping sheet are an integrally formed structure, which effectively improves the connection stability between the collector body and the spiral crimping sheet, thereby improving the stable electrical contact between the empty foil area of ​​each pole piece and the corresponding collector disc, thereby effectively ensuring the performance of the lithium-ion battery.

[0037] In one of the embodiments, the hollow foil area and the corresponding coating area of ​​each pole piece are an integrally formed structure, which improves the connection stability between the hollow foil area and the coating area.

[0038] The present application also provides a full-ear cylindrical battery. The full-ear cylindrical battery comprises a housing and a cell structure of any of the above embodiments, the winding core is arranged in the housing, the side of the current collecting plate body of the two current collecting plates away from the winding core and the side of the corresponding spiral crimping sheet away from the winding core are both insulated and connected to the inner wall of the housing, and the current collecting plate bodies of the two current collecting plates are at least partially exposed at the two ends of the housing.

[0039] Compared with the prior art, the utility model has at least the following advantages:

[0040] The battery cell structure 10 of the utility model allows the empty foil area 310 of each pole piece 300 to serve as a full pole ear, thereby better ensuring the performance of the lithium-ion battery. Furthermore, the empty foil area 310 of each pole piece 300 is arranged through the corresponding spiral air-avoiding hole 201 and is arranged adjacent to the corresponding spiral pressing piece 220, that is, the full pole ear of each pole piece 300 is at least partially protruded through the spiral air-avoiding hole 201 and is arranged on the side of the current collecting disk body 210 away from the winding core 10A. Furthermore, the spiral pressing piece 220 of each current collecting disk 200 is converged on the side of the corresponding current collecting disk body 210 away from the winding core 10A, and The empty foil area 310 of each pole piece 300 is at least partially sandwiched between the corresponding current collecting disk body 210 and the corresponding spiral crimping sheet 220, that is, the full pole ear protruding from the current collecting disk body 210 is further pressed against the side surface of the current collecting disk body 210 away from the winding core 10A through the spiral crimping sheet 220, which better ensures the stable contact between any pole ear and the current collecting disk 200 during welding, and only the full pole ear on the side of the current collecting disk body 210 away from the winding core 10A is flattened, which better reduces the accumulation of metal debris generated by the full pole ear at the winding core 10A, thereby better ensuring the performance of the lithium-ion battery.

[0041] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A battery cell structure, comprising a diaphragm, two current collecting plates and two pole pieces, each of the pole pieces comprising a linearly connected empty foil area and a coated area, wherein the coated area of ​​one pole piece, the diaphragm and the coated area of ​​the other pole piece are sequentially stacked and spirally wound to form a winding core, and the empty foil areas of the two pole pieces are respectively protrudingly arranged at both ends of the winding core, characterized in that: Each of the current collecting disks comprises a current collecting disk body and a spiral pressing piece, the current collecting disk bodies of the two current collecting disks are respectively arranged at the two ends of the winding core and respectively covered on the empty foil area of ​​the corresponding pole piece, the spiral pressing piece of each current collecting disk is connected to the side of the corresponding current collecting disk body away from the winding core, and a spiral air-avoiding hole is opened on the current collecting disk body of each current collecting disk, and the pitch of the spiral air-avoiding hole of the current collecting disk body of each current collecting disk is the same as that of the corresponding pole piece. The spiral pitches of the spiral pressing sheets are the same, the spiral pressing sheets of each current collecting disk are arranged adjacent to the corresponding spiral air avoidance holes, the empty foil area of ​​each pole piece is penetrated through the corresponding spiral air avoidance holes and arranged adjacent to the corresponding spiral pressing sheets, the spiral pressing sheets of each current collecting disk are converged to the side of the corresponding current collecting disk body away from the winding core, and the empty foil area of ​​each pole piece is at least partially sandwiched between the corresponding current collecting disk body and the corresponding spiral pressing sheet.

2. The battery cell structure according to claim 1, characterized in that: The spirally pressed sheet is a spirally pressed nickel foil sheet or a spirally pressed aluminum foil sheet.

3. The battery cell structure according to claim 1, characterized in that: The empty foil area of ​​each pole piece is cut to form a plurality of closely arranged pole ears, one end of each of the pole ears is connected to the same side of the corresponding coating area, the plurality of pole ears of the empty foil area of ​​each pole piece are independently passed through the corresponding vortex-shaped air-avoiding holes and are arranged adjacent to the corresponding vortex-shaped crimping sheets, and the plurality of pole ears of the empty foil area of ​​each pole piece are at least partially sandwiched between the corresponding current collecting plate body and the corresponding vortex-shaped crimping sheet.

4. The battery cell structure according to claim 1, characterized in that: A slurry layer is attached to at least one of the two opposite side surfaces of the coating area of ​​each pole piece.

5. The battery cell structure according to claim 1, characterized in that: The two opposite sides of the coating area of ​​each pole piece are attached with slurry layers.

6. The battery cell structure according to claim 4 or 5, characterized in that: The slurry layer attached to the coating area of ​​one of the pole pieces is a positive electrode active slurry layer, and the slurry layer attached to the coating area of ​​the other pole piece is a negative electrode active slurry layer.

7. The battery cell structure according to claim 1, characterized in that: The spiral pressing piece of each current collecting disk is riveted on the corresponding current collecting disk body, so that the spiral pressing piece of each current collecting disk is gathered at a side of the corresponding current collecting disk body away from the winding core.

8. The battery cell structure according to claim 1, characterized in that: The current collecting disc body of each current collecting disc and the corresponding vortex pressing piece are an integrally formed structure.

9. The battery core structure according to claim 1, characterized in that: The hollow foil area and the corresponding coating area of ​​each pole piece are an integrally formed structure.

10. A full-ear cylindrical battery, characterized in that: It comprises an outer shell and a battery cell structure as described in any one of claims 1 to 9, wherein the winding core is arranged in the outer shell, and a side of the collecting plate body of the two collecting plates away from the winding core and a side of the corresponding spiral crimping piece away from the winding core are both insulated and connected to the inner wall of the outer shell, and the collecting plate bodies of the two collecting plates are respectively at least partially exposed at two ends of the outer shell.

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