WO2024011703A1 - 辊压装置、复合极片、电池单体及用电装置 - Google Patents

辊压装置、复合极片、电池单体及用电装置 Download PDF

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Publication number
WO2024011703A1
WO2024011703A1 PCT/CN2022/112355 CN2022112355W WO2024011703A1 WO 2024011703 A1 WO2024011703 A1 WO 2024011703A1 CN 2022112355 W CN2022112355 W CN 2022112355W WO 2024011703 A1 WO2024011703 A1 WO 2024011703A1
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WIPO (PCT)
Prior art keywords
pole piece
rolling
rolling surface
separator
lamination
Prior art date
Application number
PCT/CN2022/112355
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English (en)
French (fr)
Inventor
林嘉
时欢
林江
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to CN202280068044.0A priority Critical patent/CN118103152A/zh
Publication of WO2024011703A1 publication Critical patent/WO2024011703A1/zh

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
    • B21B27/02—Shape or construction of rolls
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to a rolling device, composite pole piece, battery cell and electrical device.
  • a composite lamination process is required, that is, the pole pieces and separators are laminated by rolling, and then subsequent multi-layer lamination and shaping processes are performed.
  • the pressure roller structure can easily damage the adhesive coating on the surface of pole pieces or separators, resulting in poor adhesion between the separator and pole pieces during subsequent lamination and shaping processes.
  • this application provides a rolling device for rolling pole pieces and diaphragms into composite pole pieces.
  • the rolling device includes a first pressure roller and a second pressure roller.
  • the first pressure roller is rotatably arranged. , and has a first rolling surface;
  • the second pressure roller is rotatably arranged, and is arranged side by side on one side of the first pressure roller along the radial direction of the first pressure roller, and the second pressure roller has a surface facing the first roller.
  • the second rolling surface of the surface, a rolling channel for rolling the composite pole piece and the separator is formed between the first rolling surface and the second rolling surface; wherein, between the first rolling surface and the second rolling surface At least one of them is provided with a convex portion and/or a concave portion, so that a plurality of rolling gaps with different gap sizes are formed between the first rolling surface and the second rolling surface, so that laminations of different thicknesses are formed on the composite pole piece. area.
  • a convex portion and/or a concave portion are provided on at least one of the first rolling surface and the second rolling surface, so that when the pole piece and the separator pass through the rolling channel, the pole piece and the separator are Different positions of the diaphragm receive different pressures from the first pressure roller and the second pressure roller, thereby forming laminated areas with different thicknesses on the composite pole piece.
  • the area on the pole piece and the separator that is subject to greater roller pressure has a smaller bonding force after forming the composite pole piece, while the area on the pole piece and separator that is subject to smaller roller pressure has a larger adhesive force after forming the composite pole piece. of adhesion.
  • the composite pole piece still maintains good adhesion in subsequent processes.
  • the first rolling surface is provided with a plurality of convex portions and/or a plurality of concave portions.
  • the arrangement of multiple convex portions and multiple concave portions can make the distribution range of the laminated areas of different thicknesses on the composite pole piece after rolling and compounding wider, so that the composite pole piece has different adhesive properties.
  • the regional locations of knot strength are more widely distributed.
  • At least one of the plurality of convex portions and the plurality of concave portions is evenly distributed on the first rolling surface along the circumferential direction of the first pressing roller.
  • the areas on the pole piece and the diaphragm corresponding to the convex portion and the concave portion respectively are evenly distributed along the circumferential direction of the first pressure roller.
  • the structure of the pole piece and the diaphragm is more stable, and on the other hand, the structure of the pole piece and the diaphragm is more stable.
  • At least one of the plurality of convex portions and the plurality of concave portions is evenly distributed on the first rolling surface along the axial direction of the first pressing roller.
  • the areas on the pole piece and the diaphragm corresponding to the convex portion and the concave portion respectively are evenly distributed along the axial direction of the first pressure roller.
  • the structure of the pole piece and the diaphragm is more stable, and on the other hand, the structure of the pole piece and the diaphragm is more stable.
  • the second rolling surface is provided with a plurality of convex portions and/or a plurality of concave portions.
  • the arrangement of multiple convex portions and multiple concave portions can make the distribution range of the laminated areas of different thicknesses on the composite pole piece after rolling and compounding wider, so that the composite pole piece has different adhesive properties.
  • the regional locations of knot strength are more widely distributed.
  • At least one of the plurality of convex portions and the plurality of concave portions is evenly distributed on the second rolling surface along the circumferential direction of the second pressing roller.
  • the areas on the pole piece and the diaphragm corresponding to the convex surface and the concave surface respectively are evenly distributed along the circumferential direction of the second pressure roller.
  • the structure of the pole piece and the diaphragm is more stable, and on the other hand, the structure of the pole piece and the diaphragm is more stable.
  • At least one of the plurality of convex portions and/or the plurality of concave portions is evenly distributed on the second rolling surface along the axial direction of the second pressing roller.
  • the areas on the pole piece and the diaphragm corresponding to the convex surface and the concave surface respectively are evenly distributed along the axial direction of the second pressure roller.
  • the structure of the pole piece and the diaphragm is more stable, and on the other hand, the structure of the pole piece and the diaphragm is more stable.
  • the ratio range of the total area of the position where the convex portion and/or the concave portion is not provided on at least one of the first rolling surface and the second rolling surface to the total area of the convex portion and/or the concave portion is: 0.1-10.
  • the total area of the positions where the pole piece and the separator are squeezed and bonded to each other and the space between the two is not squeezed or
  • the ratio between the total areas of slightly squeezed positions with good bonding ability is fixed, thereby ensuring stable bonding between the pole pieces and the separator. It also ensures that the composite pole pieces formed by rolling can be stacked or shaped in the subsequent It has good adhesion with the external structure during other processes.
  • the first rolling surface includes a first curved portion and a plurality of convex portions and/or a plurality of concave portions connected with the first curved portion in a smooth transition, that is, the first curved portion and the plurality of convex portions and/or Or the concave portions together form the first rolling surface.
  • the portion of the first rolling surface except for all the convex portions is configured as a first curved portion.
  • a height difference is formed between the convex portion and the first curved portion, that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface and the second rolling surface.
  • the convex portion and the first curved portion exert different roller pressures on the pole pieces and the separator passing through the rolling channel. The convex portion exerts greater roller pressure on the pole pieces and the separator, while the first curved portion exerts greater roller pressure on the pole pieces and the separator. Apply less roller pressure.
  • the peeling force between the pole piece and the separator is greater at the convex surface position, and the peeling force at the first curved surface position is smaller, that is, the adhesion force between the pole piece and the separator is greater at the part corresponding to the convex surface position.
  • the composite pole piece formed by rolling the pole piece and the separator has a small adhesive force at the part corresponding to the position of the first curved surface, but can form a good bond with the external structure.
  • the portion of the first rolling surface except all the concave portions is configured as the first curved portion.
  • a height difference is formed between the concave portion and the first curved portion, that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface and the second rolling surface.
  • the concave portion and the first curved portion exert different roller pressures on the pole pieces and the separator passing through the rolling channel. The first curved portion exerts greater roller pressure on the pole pieces and the separator, while the concave portion exerts greater roller pressure on the pole pieces and the separator. Apply less roller pressure.
  • the peeling force between the pole piece and the separator at the first curved surface is greater, while the peeling force at the concave surface is smaller, that is, the adhesive force between the pole piece and the separator is stronger at the part corresponding to the first curved surface. large to ensure good bonding between the pole piece and the diaphragm.
  • the composite pole piece formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the concave portion, but can form a good bond with the external structure. Thereby, on the basis of ensuring good bonding between the pole piece and the separator, the bonding ability of the composite pole piece in subsequent processes is improved.
  • the second rolling surface includes a second curved portion and a plurality of convex portions and/or a plurality of concave portions that are smoothly transitionally connected to the second curved portion, that is, the second curved portion and the plurality of convex portions and/or Or multiple concave portions jointly form a second rolling surface.
  • the portion of the second rolling surface except for all the convex portions is configured as a second curved portion.
  • a height difference is formed between the convex portion and the second curved portion, that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface and the second rolling surface.
  • the convex portion and the second curved portion exert different roller pressures on the pole pieces and the separator passing through the rolling channel. The convex portion exerts greater roller pressure on the pole pieces and the separator, while the second curved portion exerts greater roller pressure on the pole pieces and the separator. Apply less roller pressure.
  • the peeling force between the pole piece and the separator is greater at the convex surface position, and the peeling force at the second curved surface position is smaller, that is, the adhesion force between the pole piece and the separator is greater at the part corresponding to the convex surface position.
  • the composite pole piece formed by rolling the pole piece and the separator has a small adhesive force at the part corresponding to the position of the second curved surface, but can form a good bond with the external structure.
  • the portion of the second rolling surface except for all the concave portions is configured as a second curved portion.
  • a height difference is formed between the concave portion and the second curved portion, that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface and the second rolling surface.
  • the concave portion and the second curved portion exert different roller pressures on the pole pieces and the separator passing through the rolling channel.
  • the second curved portion exerts greater roller pressure on the pole pieces and the separator, while the concave portion exerts greater roller pressure on the pole pieces and the separator. Apply less roller pressure.
  • the peeling force between the pole piece and the separator at the second curved surface is greater, while the peeling force at the concave surface is smaller, that is, the adhesive force between the pole piece and the separator at the part corresponding to the second curved surface is stronger. large to ensure good bonding between the pole piece and the diaphragm.
  • the composite pole piece formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the concave portion, but can form a good bond with the external structure. Thereby, on the basis of ensuring good bonding between the pole piece and the separator, the bonding ability of the composite pole piece in subsequent processes is improved.
  • the convex portion is a convex curved surface structure.
  • the convex portion rolls the pole piece and the separator, it can avoid the sharp edges or burrs on the edge of the convex portion from damaging the surfaces of the pole piece and the separator during the rolling process, so that the pole piece can be
  • the rolling process with the diaphragm is smoother.
  • the concave portion is a concave curved surface structure.
  • the concave portion rolls the pole pieces and the separator respectively, it can avoid the sharp edges or burrs on the edges of the concave portion from damaging the surfaces of the pole pieces and the separator during the rolling process, and the pole pieces can be made
  • the rolling process of the sheet and separator is smoother.
  • one of the first rolling surface and the second rolling surface includes a convex portion, and the other includes a concave portion, and the convex portion and the concave portion are staggered along the axis direction of the first pressing roller. layout.
  • a convex portion is provided on one of the first rolling surface and the second rolling surface, and a concave portion is provided on the other, which can improve the relationship between the first rolling surface and the second rolling surface.
  • the height difference between the rolling surfaces strengthens the bonding strength between the pole piece and the diaphragm corresponding to the convex part, and on this basis, ensures that the pole piece and the diaphragm maintain good adhesion at the position corresponding to the concave part.
  • this application provides a composite pole piece.
  • the composite pole piece is rolled and formed by the rolling device as described above.
  • the composite pole piece includes:
  • the diaphragm is laminated and pressed on the pole piece to form a composite pole piece;
  • lamination regions with different lamination thicknesses are formed on the composite pole piece.
  • lamination regions with different lamination thicknesses include:
  • the lamination thickness of the first lamination region is smaller than the lamination thickness of the second lamination region, and the peeling force between the pole piece and the separator in the first lamination region is greater than the peeling force between the pole piece and the separator in the second lamination region.
  • the first lamination area is the area corresponding to the higher position on the first rolling surface and the second rolling surface.
  • the pole piece and the separator are subject to greater stress.
  • the roller pressure results in greater peeling force between the pole piece and the separator, and higher bonding strength between the pole piece and the separator.
  • the second lamination area is the area corresponding to the lower height position of the first rolling surface and the second rolling surface.
  • the pole piece and the separator are subject to smaller roller pressure. Therefore, the pole piece and the separator are The peeling force between separators is smaller.
  • the composite pole piece formed by rolling the pole piece and the separator has good bonding ability in this area, so that it can be bonded to the external structure in subsequent processes.
  • the lamination thickness of the first lamination region is less than or equal to 90% of the lamination thickness of the second lamination region.
  • the lamination thickness difference between the first lamination region and the second lamination region is too large, resulting in the pole piece and the separator being affected by the rollers of the first lamination region and the second lamination region.
  • the pole piece and the separator When pressed, cracks develop between the two areas, causing structural damage to the pole piece and diaphragm.
  • it can ensure that after the pole piece and the separator are rolled, the pole piece and the separator are well bonded at the position corresponding to the second lamination area, and the position corresponding to the first lamination area has a structure that can be connected with the external structure. Bonding ability for stable bonding.
  • the peeling force between the pole piece and the separator in the first lamination region is greater than or equal to 150% of the peeling force between the pole piece and the separator in the second lamination region.
  • the technical solution of the embodiment of the present application can ensure good bonding between the pole piece and the separator, and avoid delamination of the composite pole piece during subsequent processing.
  • the present application provides a battery cell, including the composite pole piece as described above.
  • the present application provides an electrical device, including the battery cell as described above, and the battery cell is used to provide electric energy.
  • the above-mentioned rolling device, composite pole piece, battery cell and electrical device are provided with a convex portion and/or a concave portion on at least one of the first rolling surface and the second rolling surface, so that the pole piece and the separator pass through
  • the roller pressure exerted on the pole piece and the diaphragm is greater at the smaller rolling gap formed between the first rolling surface and the second rolling surface.
  • the gap between the pole piece and the diaphragm is at this position.
  • the sticky coating is squeezed, and the bond between the pole piece and the diaphragm is stronger at this position.
  • the roller pressure exerted on the pole piece and the separator is small or no roller pressure. Therefore, the gap between the pole piece and the separator is The adhesive coating at this position is slightly squeezed or not squeezed, so that the composite pole piece formed by rolling has good bonding ability at this position, so that it can be easily connected to the external structure during subsequent lamination or shaping processes. Carry out bonding.
  • Figure 1 is a schematic structural diagram of a rolling device according to an embodiment of the present application.
  • Figure 2 is a schematic side view of the first pressure roller according to an embodiment of the present application.
  • Figure 3 is a schematic side view of the second pressure roller according to an embodiment of the present application.
  • Figure 4 is a schematic side view of the first pressure roller or the second pressure roller in an embodiment of the present application
  • Figure 5 is a schematic side view of the first pressure roller or the second pressure roller in another embodiment of the present application.
  • Figure 6 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to an embodiment of the present application
  • Figure 7 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to another embodiment of the present application.
  • Figure 8 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to an embodiment of the present application.
  • Figure 9 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to another embodiment of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the pole pieces and separators need to be compositely stacked to form composite pole pieces. Specifically, a layer of adhesive coating is applied to the surface of the separator, and the pole pieces and the separator are laminated, and the pole pieces and the separator are compounded after being rolled.
  • the inventor designed a rolling device after in-depth research.
  • the surface of the pressure roller is The first rolling part presses the partial area of the pole piece and the separator, and the entire pole piece and the separator are stably bonded through the area corresponding to the first rolling part.
  • the area corresponding to the pole piece and separator and the second rolling part on the surface of the pressure roller is not subjected to extrusion force. Therefore, the adhesive coating in this part of the area is well preserved to improve the performance of the pole piece and separator in subsequent lamination or shaping processes. medium bonding strength. As a result, the overall bonding firmness after the battery cells are completed is improved, thereby improving the overall safety performance of the battery.
  • the battery usually includes a case and a battery cell, and the battery cell is accommodated in the case.
  • a battery there can be multiple battery cells, and multiple battery cells can be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, parallel, or mixed together, and then the whole composed of multiple battery cells can be accommodated in the box.
  • the battery can also be in the form of a battery module in which multiple battery cells are connected in series, parallel, or mixed, and then multiple battery modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box.
  • the battery may also include other structures, for example, it may also include a bus component for electrical connection between multiple battery cells.
  • Each battery cell may be a secondary battery or a primary battery, or may be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.
  • the battery cell can be in the shape of cylinder, flat body, rectangular parallelepiped or other shapes.
  • a battery cell is the smallest unit that makes up a battery.
  • a battery cell it includes end caps, casings, cell components and other functional components.
  • the end cover and the housing together form a storage space for accommodating battery core components and other functional components.
  • the battery cell component is the component that undergoes electrochemical reactions in the battery cell, and one or more battery cell components can be accommodated in the accommodation space.
  • the battery core assembly is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets.
  • the portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the cell assembly, and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material each constitute the tabs.
  • the positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body.
  • the positive active material and negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.
  • Figure 1 is a schematic structural diagram of a rolling device according to an embodiment of the present application
  • Figure 2 is a schematic side view of a first pressing roller according to an embodiment of the present application
  • Figure 3 is a schematic diagram of an implementation of the present application.
  • An embodiment of the present application provides a rolling device 100 for rolling pole pieces and separators into composite pole pieces 201, including a first pressure roller 10 and a second pressure roller 20.
  • the first pressing roller 10 is rotatably arranged and has a first rolling surface 11 .
  • the second pressure roller 20 is rotatably arranged and arranged side by side on one side of the first pressure roller 10 along the radial direction of the first pressure roller 10 .
  • the second pressing roller 20 has a second rolling surface 21 facing the first rolling surface 11.
  • a rolling channel for rolling the composite pole piece and the separator is formed between the first rolling surface 11 and the second rolling surface 21.
  • at least one of the first rolling surface 11 and the second rolling surface 21 is provided with a convex portion 12 and/or a concave portion 13 so that a gap between the first rolling surface 11 and the second rolling surface 21 is formed.
  • a plurality of rolling gaps with different gap sizes are used to form laminated areas of different thicknesses on the composite pole piece 201 .
  • first pressure roller 10 and the second pressure roller 20 are each configured as a cylindrical pressure roller structure, and both the first pressure roller 10 and the second pressure roller 20 are rotatably arranged.
  • the axes of the first pressure roller 10 and the second pressure roller 20 are parallel to each other, and they can be respectively arranged on the external structure, so that the first pressure roller 10 and the second pressure roller 20 are arranged side by side in the radial direction, so that A rolling channel 30 is formed between the two.
  • the spacing of the rolling channel 30 can be set according to the actual use situation, for example, it can be set according to the final thickness of the composite pole piece 201 formed by rolling, so that the pole piece and the separator are separated after passing through the rolling channel 30.
  • the formed composite pole piece 201 meets the target thickness.
  • the convex portion 12 can be provided on the first rolling surface 11 or the second rolling surface 21
  • the concave portion 13 can also be provided on the first rolling surface 11 or the second rolling surface 21
  • the convex portion 12 can be provided on the first rolling surface 11 and the second rolling surface 21 at the same time, or the concave portion 13 can be provided on the first rolling surface 11 and the second rolling surface 21 at the same time.
  • the convex portion 12 and the concave portion 13 can also be provided on the first rolling surface 11 and the second rolling surface 21 respectively.
  • the convex portion 12 and the concave portion 13 are provided on the first rolling surface 11 and the second rolling surface 21 at the same time, the convex portion 12 on the first rolling surface 11 should be consistent with the second rolling surface 21 The convex portion 12 on the first rolling surface 11 should be opposite to the concave portion 13 on the second rolling surface 21 .
  • the pole pieces and the separator when the pole pieces and the separator pass through the rolling channel 30 , the pole pieces Different positions of the sheet and the separator receive different pressures from the first pressure roller 10 and the second pressure roller 20 , thereby forming laminated areas of different thicknesses on the composite pole piece 201 .
  • the area on the pole piece and the separator that is subject to greater roller pressure has a smaller bonding force after the composite pole piece 201 is formed, while the area on the pole piece and the separator that is subject to smaller roller pressure has a smaller adhesive force after the composite pole piece 201 is formed. Greater adhesion. As a result, the composite pole piece 201 still maintains good adhesion in subsequent processes.
  • the roller pressure exerted on the pole pieces and the separator at the smaller rolling gap formed between the first rolling surface 11 and the second rolling surface 21 Larger, the sticky coating between the pole piece and the separator at this position is squeezed, and the bonding between the pole piece and the separator at this position is stronger. However, the larger rolling gap formed between the first rolling surface 11 and the second rolling surface 21 exerts less or no roller pressure on the pole piece and the separator. Therefore, the gap between the pole piece and the separator is The adhesive coating at this position is slightly squeezed or not squeezed, so that the composite pole piece 201 formed by rolling has good bonding ability at this position to facilitate subsequent lamination or shaping processes. Bonded to external structure.
  • the first rolling surface 11 is provided with a plurality of convex portions 12 and/or a plurality of concave portions 13 .
  • the arrangement of a plurality of convex portions 12 and a plurality of concave portions 13 can make the distribution range of the lamination areas of different thicknesses on the composite pole piece 201 after roll lamination wider, so that the composite pole piece 201 has different adhesive forces. Regional locations are more widely distributed.
  • At least one of the plurality of convex portions 12 and the plurality of concave portions 13 is evenly distributed on the first rolling surface 11 along the circumferential direction of the first pressing roller 10 .
  • the areas on the pole piece and the diaphragm corresponding to the convex portion 12 and the concave portion 13 respectively are evenly distributed along the circumferential direction of the first pressure roller 10 .
  • the composite pole piece 201 formed by rolling the pole piece and the separator is more stable when it is subsequently bonded to other structures.
  • At least one of the plurality of convex portions 12 and the plurality of concave portions 13 is evenly distributed on the first rolling surface 11 along the axial direction of the first pressing roller 10 .
  • the areas on the pole piece and the diaphragm corresponding to the convex portion 12 and the concave portion 13 respectively are evenly distributed along the axial direction of the first pressure roller 10 .
  • a plurality of convex portions 12 and/or a plurality of concave portions 13 are provided on the second rolling surface 21 .
  • the arrangement of a plurality of convex portions 12 and a plurality of concave portions 13 can make the distribution range of the lamination areas of different thicknesses on the composite pole piece 201 after roll lamination wider, so that the composite pole piece 201 has different adhesive forces. Regional locations are more widely distributed.
  • At least one of the plurality of convex portions 12 and the plurality of concave portions 13 is evenly distributed on the second rolling surface 21 along the circumferential direction of the second pressing roller 20 .
  • the areas on the pole piece and the diaphragm corresponding to the convex portion 12 and the concave portion 13 respectively are evenly distributed along the circumferential direction of the second pressure roller 20 .
  • the composite pole piece 201 formed by rolling the pole piece and the separator is more stable when it is subsequently bonded to other structures.
  • At least one of the plurality of convex portions 12 and the plurality of concave portions 13 is evenly distributed on the second rolling surface 21 along the axial direction of the second pressing roller 20 .
  • the areas on the pole piece and the diaphragm corresponding to the convex portion 12 and the concave portion 13 respectively are evenly distributed along the axial direction of the second pressure roller 20 .
  • the total area of the position where the convex portion 12 and/or the concave portion 13 is not provided on at least one of the first rolling surface 11 and the second rolling surface 21 is equal to the total area of the convex portion 12 and/or the concave portion 13
  • the ratio of total area ranges from 0.1-10.
  • the ratio of the total area of the position where the convex portion 12 is not provided on the first rolling surface 11 to the total area of the convex portion 12 ranges from 0.1 to 10.
  • the ratio of the total area of the position where the concave portion 13 is not provided on the first rolling surface 11 to the total area of the concave portion 13 ranges from 0.1 to 10.
  • the ratio of the total area of the position where the convex portion 12 is not provided on the second rolling surface 21 to the total area of the convex portion 12 ranges from 0.1 to 10.
  • the ratio of the total area of the position where the concave portion 13 is not provided on the second rolling surface 21 to the total area of the concave portion 13 ranges from 0.1 to 10.
  • Figure 4 is a schematic side view of the first pressure roller or the second pressure roller in an embodiment of the present application.
  • the ratio of the total area of the position to the total area of the convex portion 12 is When it is 1, the diameter of the convex portion 12 is 5.94 millimeters (mm), and the distance between the center points of each two adjacent convex portions 12 is 8mm.
  • Figure 5 is a schematic side view of the first pressure roller or the second pressure roller in another embodiment of the present application.
  • the concave portion 13 is provided on the first rolling surface 11 and/or the second rolling surface 21, and the concave portion 13 is not provided, the total area of the position and the total area of the concave portion 13 are When the ratio is 1, the diameter of the concave portion 13 is 5.94mm, and the distance between the center points of each two adjacent concave portions 13 is 8mm.
  • the total area of the locations where the convex portion 12 and/or the concave portion 13 are not provided on the first rolling surface 11 and/or the second rolling surface 21 is different from the total area of the convex portion 12 and/or the concave portion 13 .
  • the area ratio can be adjusted according to actual needs and will not be described in detail here.
  • the height of the convex portion 12 or the depth of the concave portion 13 can be adjusted accordingly according to actual rolling requirements to obtain the composite pole piece 201 with regions of different thicknesses.
  • the total area of the positions where the pole piece and the separator are squeezed and bonded to each other and the space between the two is not squeezed or slightly squeezed.
  • the ratio between the total area of the position with good bonding ability is fixed, thereby ensuring stable bonding between the pole piece and the separator, and also ensuring that the separator in the composite pole piece 201 formed by rolling remains good during the subsequent shaping process.
  • the bonding force allows the various parts of the composite pole piece 201 to be stably bonded during the subsequent shaping process.
  • the first rolling surface 11 includes a first curved portion 111 and a plurality of convex portions 12 and/or a plurality of concave portions 13 that are smoothly transitionally connected to the first curved portion 111 , that is, the first curved portion 111 and The plurality of convex portions 12 and/or concave portions 13 jointly form the first rolling surface 11,
  • the first curved portion 111 and the plurality of convex portions 12 jointly form the first rolling surface 11 .
  • first curved portion 111 and the plurality of concave portions 13 jointly form the first rolling surface 11 .
  • first curved portion 111 and the plurality of concave portions 13 jointly form the first rolling surface 11 .
  • the portion of the first rolling surface 11 except for all the convex portions 12 is configured as a first curved portion 111 .
  • a height difference is formed between the convex portion 12 and the first curved portion 111 , that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface 11 and the second rolling surface 21 .
  • the convex portion 12 and the first curved portion 111 exert different roller pressures on the pole pieces and the separator passing through the rolling channel 30 .
  • the convex portion 12 exerts greater roller pressure on the pole pieces and the separator, while the first curved portion 111
  • the roller pressure exerted on the pole piece and diaphragm is small.
  • the peeling force between the pole piece and the separator at the position of the convex portion 12 is greater, while the peeling force at the first curved portion 111 is smaller, that is, the partial bonding force between the pole piece and the separator corresponding to the position of the convex portion 12 Larger to ensure good bonding between the pole piece and the diaphragm.
  • the composite pole piece 201 formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the position of the first curved portion 111, but can form a good bond with the external structure. Thereby, on the basis of ensuring good bonding between the pole piece and the separator, the bonding ability of the composite pole piece 201 in subsequent processes is improved.
  • the portion of the first rolling surface 11 except all the concave portions 13 is configured as the first curved portion 111 .
  • a height difference is formed between the concave portion 13 and the first curved portion 111 , that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface 11 and the second rolling surface 21 .
  • the concave portion 13 and the first curved portion 111 exert different roller pressures on the pole pieces and the diaphragm passing through the rolling channel 30 .
  • the first curved portion 111 exerts greater roller pressure on the pole pieces and the separator, while the concave portion 13 exerts less roller pressure on the pole pieces and the separator.
  • the peeling force between the pole piece and the separator at the position of the first curved portion 111 is greater, while the peeling force at the concave portion 13 is smaller, that is, the pole piece and the separator are adhered to each other at the portion corresponding to the position of the first curved portion 111.
  • the bonding force is greater, thereby ensuring good bonding between the pole piece and the diaphragm.
  • the composite pole piece 201 formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the concave portion 13, but can form a good bond with the external structure.
  • the separator in the composite pole piece 201 can exert good bonding force during the subsequent shaping process, so that the various parts of the composite pole piece 201 can maintain good bonding force during the subsequent shaping process. Stable bonding.
  • the shape of the convex portion 12 can be any shape, and the specific shape can be selected according to actual needs.
  • this embodiment takes a circular convex surface as an example. It is understood that in some other embodiments, the convex portion can also be configured as an oval convex portion, a square convex portion, or a convex portion of other structures, which will not be described again here.
  • the convex portion 12 can be provided as a plurality of convex structures spaced and evenly arranged along the circumferential direction of the first pressure roller 10 and/or the second pressure roller 20 , or can also be provided as a plurality of convex structures along the circumferential direction of the first pressure roller 10 and/or the second pressure roller 20 .
  • the specific structure of the convex strips continuously distributed in the circumferential direction of the second pressing roller 20 can be adjusted accordingly according to actual needs, and will not be described again here.
  • the convex portion 12 can be provided as a plurality of convex structures spaced and evenly arranged along the axial direction of the first pressure roller 10 and/or the second pressure roller 20 , or can also be provided as a plurality of convex structures along the first pressure roller 10 and/or the second pressure roller 10 and/or the axially continuously distributed ridges of the second pressure roller 20.
  • the specific structure can be adjusted accordingly according to actual needs, and will not be described again here.
  • the second rolling surface 21 includes a second curved portion 211 and a plurality of convex portions 12 and/or a plurality of concave portions 13 that are smoothly transitionally connected to the second curved portion 211 , that is, the second curved portion 211 and The plurality of convex portions 12 and/or the plurality of concave portions 13 jointly form the second rolling surface 21 .
  • the second curved portion 211 and the plurality of convex portions 12 jointly form the second rolling surface 21 .
  • the second curved portion 211 and the plurality of concave portions 13 jointly form the second rolling surface 21 .
  • the second curved portion 211 and the plurality of convex portions 12 and concave portions 13 jointly form the second rolling surface 21 .
  • the portion of the second rolling surface 21 except for all the convex portions 12 is configured as a second curved portion 211 .
  • a height difference is formed between the convex portion 12 and the second curved portion 211 , that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface 11 and the second rolling surface 21 .
  • the convex portion 12 and the second curved portion 211 exert different roller pressures on the pole pieces and the separator passing through the rolling channel 30 .
  • the convex portion 12 exerts greater roller pressure on the pole pieces and the separator, while the second curved portion 211
  • the roller pressure exerted on the pole piece and diaphragm is small.
  • the peeling force between the pole piece and the separator at the position of the convex portion 12 is greater, while the peeling force at the second curved portion 211 is smaller, that is, the partial bonding force between the pole piece and the separator corresponding to the position of the convex portion 12 Larger to ensure good bonding between the pole piece and the diaphragm.
  • the composite pole piece 201 formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the position of the second curved portion 211, but can form a good bond with the external structure.
  • the separator in the composite pole piece 201 can exert a good bonding force during the subsequent shaping process, so that the various parts of the composite pole piece 201 can maintain good bonding force during the subsequent shaping process. Stable bonding.
  • the portion of the second rolling surface 21 except for all the concave portions 13 is configured as a second curved portion 211 .
  • a height difference is formed between the concave portion 13 and the second curved portion 211 , that is, a plurality of rolling gaps with different gap sizes are formed between the first rolling surface 11 and the second rolling surface 21 .
  • the concave portion 13 and the second curved portion 211 exert different roller pressures on the pole pieces and the separator passing through the rolling channel 30 .
  • the second curved portion 211 exerts greater roller pressure on the pole pieces and the separator, while the concave portion 13
  • the roller pressure exerted on the pole piece and diaphragm is small. Therefore, the peeling force between the pole piece and the separator at the position of the second curved portion 211 is greater, and the peeling force at the concave portion 13 is smaller, that is, the pole piece and the separator are adhered to each other at the portion corresponding to the second curved portion 211.
  • the bonding force is greater, thereby ensuring good bonding between the pole piece and the diaphragm.
  • the composite pole piece 201 formed by rolling the pole piece and the separator has a small adhesive force at the portion corresponding to the concave portion 13, but can form a good bond with the external structure. Therefore, on the basis of ensuring the stable bonding between the pole piece and the separator, the separator in the composite pole piece 201 can exert a good bonding force during the subsequent shaping process, so that the various parts of the composite pole piece 201 can maintain good bonding force during the subsequent shaping process. Stable bonding.
  • the shape of the concave portion 13 can be any shape, and the specific shape can be selected according to actual needs.
  • this embodiment takes a circular concave portion as an example, that is, the concave portion is configured as a circular groove structure. It is understood that in some other embodiments, the concave portion 13 can also be configured as an elliptical concave portion, a square concave portion, or a concave portion of other structures, which will not be described again here.
  • the concave portion 13 may be provided as a plurality of concave structures that are spaced and evenly arranged along the circumferential direction of the first pressure roller 10 and/or the second pressure roller 20 , or may be provided as a plurality of concave structures along the circumferential direction of the first pressure roller 10 and/or the second pressure roller 20 .
  • the specific structure of the groove channels continuously distributed in the circumferential direction of the pressure roller 20 can be adjusted accordingly according to actual needs, and will not be described again here.
  • the concave portion 13 may be provided as a plurality of concave structures spaced and evenly arranged along the axial direction of the first pressure roller 10 and/or the second pressure roller 20 , or may be provided as a plurality of concave structures along the first pressure roller 10 and/or the second pressure roller 20 . /or the groove channels continuously distributed in the axial direction of the second pressure roller 20.
  • the specific structure can be adjusted accordingly according to actual needs, and will not be described again here.
  • Figure 8 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to one embodiment of the present application.
  • Figure 9 is a partial cross-sectional view of the first pressure roller or the second pressure roller according to another embodiment of the present application. Partial cutaway view.
  • the convex portion 12 is a convex curved surface structure. Therefore, when the convex portion 12 rolls the pole pieces and the separator, it can avoid the sharp edges or burrs on the edges of the convex portion 12 from damaging the surfaces of the pole pieces and the separator during the rolling process, so that the rollers between the pole pieces and the separator can be prevented from being damaged.
  • the pressing process is smoother.
  • the concave portion 13 is a concave curved surface structure. Therefore, when the concave portion 13 rolls the pole pieces and the separator, the sharp edges or edge burrs of the concave portion 13 can be prevented from damaging the surfaces of the pole pieces and the separator during the rolling process, and the rollers between the pole pieces and the separator can be made The pressing process is smoother.
  • one of the first rolling surface 11 and the second rolling surface 21 includes a convex portion 12 and the other includes a concave portion 13 , and the convex portion 12 and the concave portion 13 are formed along the first rolling surface 11 and the second rolling surface 21 .
  • the axial directions of the pressure rollers 10 are staggered.
  • the convex portion 12 cooperates with the surface of the other pressure roller to squeeze the upper part of the pole piece and the separator, so that the pole piece and the separator are bonded in this area.
  • the concave portion 13 cooperates with the surface of the other pressing roller so that the corresponding areas of the pole piece and the diaphragm are not subject to extrusion force during the rolling process, or are subject to a smaller extrusion force. Therefore, the adhesive coating in this area of the pole piece and the separator maintains good bonding ability, so that the composite pole piece 201 formed by rolling can be bonded to the external structure again later.
  • the relationship between the first rolling surface 11 and the second rolling surface 21 can be improved.
  • the height difference between the pole pieces and the diaphragm is thereby enhanced to strengthen the bonding strength between the pole piece and the separator at the position corresponding to the convex portion 12, and on this basis, it is ensured that good bonding force is maintained between the pole piece and the diaphragm at the position corresponding to the concave portion 13.
  • this application provides a composite pole piece 201, which is formed by rolling with the above-mentioned rolling device.
  • the composite pole piece 201 includes a pole piece and a separator laminated on the pole piece.
  • the pole piece and the separator together form the composite pole piece 201.
  • lamination regions with different lamination thicknesses are formed on the composite pole piece 201 .
  • the lamination regions with different lamination thicknesses include a first lamination region and a second lamination region.
  • the lamination thickness of the first lamination region is smaller than the lamination thickness of the second lamination region, and the peeling force between the pole piece and the separator in the first lamination region is greater than the peeling force between the pole piece and the separator in the second lamination region.
  • the first lamination area is the area corresponding to the higher position on the first rolling surface 11 and the second rolling surface 21. In this area, the pole piece and the separator are subject to greater roller pressure, so that the pole piece The peeling force between the pole piece and the separator is greater, and the bonding strength between the pole piece and the separator itself is higher.
  • the second lamination area is the area corresponding to the lower height position on the first rolling surface 11 and the second rolling surface 21. In this area, the pole piece and the separator are subject to smaller roller pressure. Therefore, the extremely The peeling force between the sheet and separator is smaller. As a result, the separator in the composite pole piece 201 exerts good bonding force during the subsequent shaping process, so that the various parts of the composite pole piece 201 can be stably bonded during the subsequent shaping process.
  • the lamination thickness of the first lamination region is less than or equal to 90% of the lamination thickness of the second lamination region.
  • the lamination thickness difference between the first lamination region and the second lamination region is too large, causing the pole piece and the separator to be formed between the two regions when they are rolled by the first lamination region and the second lamination region. Cracks, causing structural damage to the pole piece and diaphragm.
  • the pole piece and the separator can ensure that after the pole piece and the separator are rolled, the pole piece and the separator are well bonded at the position corresponding to the second lamination area, and the position corresponding to the first lamination area has a structure that can be connected with the external structure. Bonding ability for stable bonding.
  • the peeling force between the pole piece and the separator in the first lamination region is greater than or equal to 150% of the peeling force between the pole piece and the separator in the second lamination region.
  • this application provides a battery cell, including the composite pole piece 201 as described above.
  • the composite pole piece 201 Since the composite pole piece 201 has regions with different thicknesses that meet the requirements, when the composite pole piece 201 is used in a battery cell, the integrity of the overall structure of the battery cell can be improved, thereby improving the safety performance of the battery cell.
  • the present application provides an electrical device, including the above-mentioned battery cell, and the battery cell is used to provide electric energy.
  • the stacked pole pieces and separators pass through the rolling channel 30, and the small gap formed between the first rolling surface 11 and the second rolling surface 21 is at the rolling gap between the pole pieces and the diaphragm.
  • the roller pressure exerted on the separator is greater, and the sticky coating between the pole piece and the separator at this position is squeezed, and the bonding between the pole piece and the separator at this position is stronger.
  • the rolling pressure exerted on the pole piece and the separator is small or no rolling pressure.
  • the adhesive coating at this position between the pole piece and the separator is slightly squeezed or not squeezed, so that the separator in the composite pole piece 201 exerts good adhesion during the subsequent shaping process, so that the composite pole piece 201
  • the various parts can be stably bonded during the subsequent shaping process.

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Abstract

本申请涉及一种辊压装置、复合极片、电池单体以及用电装置，辊压装置包括：第一压辊(10)，具有第一辊压面(11)；第二压辊(20)，具有朝向第一辊压面(11)的第二辊压面(21)；第一辊压面(11)和第二辊压面(21)中至少一者上设置有凸面部(12)和/或凹面部(13)。

Description

辊压装置、复合极片、电池单体及用电装置
交叉引用
本申请引用于2022年7月12日递交的名称为“辊压装置、复合极片、电池单体以及用电装置”的第202221784788.6号中国专利申请，其通过引用被全部并入本申请。
技术领域
本申请涉及电池技术领域，特别是涉及一种辊压装置、复合极片、电池单体以及用电装置。
背景技术
电池制备过程中，需要进行复合叠片工艺，即将极片和隔膜经过辊压进行复合，然后进行后续的多层叠片及整形处理。
在极片和隔膜的辊压复合过程中，压辊结构容易破坏极片或隔膜表面的粘性涂层，从而导致后续叠片及整形过程中隔膜与极片粘结不良。
发明内容
基于此，有必要针对极片及隔膜经过辊压后表面粘性涂层受到破坏而导致粘结不良的问题，提供一种辊压装置、复合极片、电池单体以及用电装置。
第一方面，本申请提供了一种辊压装置，用于将极片与隔膜辊压成复合极片，辊压装置包括第一压辊及第二压辊，第一压辊可转动地设置，且具有第一辊压面；第二压辊可转动地设置，且沿第一压辊的径向方向，并排布置于第一压辊的一侧，第二压辊具有朝向第一辊压面的第二辊压面，第一辊压面与第二辊压面之间形成用于辊压复合极片与隔膜的辊压通道；其中，第一辊压面和第二辊压面中至少一者上设置有凸面部和/或凹面部，以使得第一辊压面与第二辊压面之间形成多个间隙大小不同的辊压缝隙，以使复合极片上形成不同厚度的层叠区域。
本申请实施例的技术方案中，通过在第一辊压面和第二辊压面中至少一者上设置凸面部和/或凹面部，使得极片与隔膜经过辊压通道时，极片与隔膜的不同位置所受到的第一压辊及第二压辊的辊压力大小不同，从而在复合极片上形成不同厚度的层叠区域。其中，极片与隔膜上受到较大辊压力的区域在形成复合极片后具有较小的粘结力，而极片与隔膜上受到较小辊压力的区域在形成复合极片后具有较大的粘结力。由此，使得复合极片在后续工序中仍然保持良好的粘结力。
在一些实施例中，第一辊压面上设置有多个凸面部和/或多个凹面部。
本申请实施例的技术方案中，多个凸面部及多个凹面部的设置，能够使经过辊压复合后的复合极片上不同厚度的层叠区域的分布范围更广，使复合极片上具有不同粘结力的区域位置分布更广。
在一些实施例中，多个凸面部和多个凹面部中至少一者沿第一压辊的周向均匀分布于第一辊压面上。
本申请实施例的技术方案中，极片与隔膜上分别与凸面部及凹面部对应的区域均沿第一压辊的周向均匀分布，一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片在后续与其他结构进行粘结时更加稳定。
在一些实施例中，多个凸面部和多个凹面部中至少一者沿第一压辊的轴向均匀分布于第一辊压面上。
本申请实施例的技术方案中，极片与隔膜上分别与凸面部及凹面部对应的区域均沿第一压辊的轴向均匀分布，一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片在后续与其他结构进行粘结时更加稳定。
在一些实施例中，第二辊压面上设置有多个凸面部和/或多个凹面部。
本申请实施例的技术方案中，多个凸面部及多个凹面部的设置，能够使经过辊压复合后的复合极片上不同厚度的层叠区域的分布范围更广，使复合极片上具有不同粘结力的区域位置分布更广。
在一些实施例中，多个凸面部和多个凹面部中至少一者沿第二压辊的周向均匀分布于第二辊压面上。
本申请实施例的技术方案中，极片与隔膜上分别与凸面部及凹面部对应的区域均沿第二压辊的周向均匀分布，一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片在后续与其他结构进行粘结时更加稳定。
在一些实施例中，多个凸面部和/多个凹面部中至少一者沿第二压辊的轴向均匀分布于第二辊压面上。
本申请实施例的技术方案中，极片与隔膜上分别与凸面部及凹面部对应的区域均沿第二压辊的轴向均匀分布，一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片在后续与其他结构进行粘结时更加稳定。
在一些实施例中，第一辊压面和第二辊压面中至少一者上未设置凸面部和/或凹面部的位置总面积与凸面部和/或凹面部的总面积的比值范围为0.1-10。
本申请实施例的技术方案中，当极片与隔膜经过辊压通道时，使得极片与隔膜之间被挤压而相互粘结的位置的总面积和两者之间未被挤压或被轻微挤压而具有良好粘结能力的位置的总面积之间的比值固定，从而确保极片与隔膜之间粘结稳定之外，还能够确保辊压形成的复合极片在后续叠片或者整形等工序时与外部结构之间具有良好的粘结力。
在一些实施例中，第一辊压面包括第一曲面部以及与第一曲面部圆滑过渡连接的多个凸面部和/或多个凹面部，即第一曲面部与多个凸面部和/或凹面部共同形成第一辊压面。
本申请实施例的技术方案中，当第一辊压面上设置有多个凸面部时，第一辊压面上除全部凸面部之外的部分被构造为第一曲面部。由此，凸面部与第一曲面部之间形成高度差，即在第一辊压面与第二辊压面之间形成多个间隙大小不同的辊压缝隙。此外，凸面部与第一曲面部对经过辊压通道的极片与隔膜施加大小不同的辊压力，凸面部对极片与隔膜施加的辊压力更大，而第一曲面部对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在凸面部位置的剥离力更大，而在第一曲面部位置的剥离力更小，即极片和隔膜在与凸面部位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片在与第一曲面部位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜良好粘结的基础上，提高复合极片在后续工序中的粘结能力。
同理，当第一辊压面上设置有多个凹面部时，第一辊压面上除全部凹面部之外的部分被构造为第一曲面部。由此，凹面部与第一曲面部之间形成高度差，即在第一辊压面与第二辊压面之间形成多个间隙大小不同的辊压缝隙。此外，凹面部与第一曲面部对经过辊压通道的极片与隔膜施加大小不同的辊压力，第一曲面部对极片与隔膜施加的辊压力更大，而凹面部对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在第一曲面部位置的剥离力更大，而在凹面部位置的剥离力更小，即极片和隔膜在与第一曲面部位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片在与凹面部位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜良好粘结的基础上，提高复合极片在后续工序中的粘结能力。
在一些实施例中，第二辊压面包括第二曲面部以及与第二曲面部圆滑过渡连接的多个凸面部和/或多个凹面部，即第二曲面部与多个凸面部和/或多个凹面部共同形成第二辊压面。
本申请实施例的技术方案中，当第二辊压面上设置有多个凸面部时，第二辊压面上除全部凸面部之外的部分被构造为第二曲面部。由此，凸面部与第二曲面部之间形成高度差，即在第一辊压面与第二辊压面之间形成多个间隙大小不同的辊压缝隙。此外，凸面部与第二曲面部对经过辊压通道的极片与隔膜施加大小不同的辊压力，凸面部对极片与隔膜施加的辊压力更大，而第二曲面部对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在凸面部位置的剥离力更大，而在第二曲面部位置的剥离力更小，即极片和隔膜在与凸面部位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片在与第二曲面部位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜良好粘结的基础上，提高复合极片在后续工序中的粘结能力。
同理，当第二辊压面上设置有多个凹面部时，第二辊压面上除全部凹面部之外的部分被构造为第二曲面部。由此，凹面部与第二曲面部之间形成高度差，即在第一辊压面与第二辊压面之间形成多个间隙大小不同的辊压缝隙。此外，凹面部与第二曲面部对经过辊压通道的极片与隔膜施加大小不同的辊压力，第二曲面部对极片与隔膜施加的辊压力更大，而凹面部对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在第二曲面部位置的剥离力更大，而在凹面部位置的剥离力更小，即极片和隔膜在与第二曲面部位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片在与凹面部位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜良好粘结的基础上，提高复合极片在后续工序中的粘结能力。
在一些实施例中，凸面部为凸起的曲面结构。
本申请实施例的技术方案中，当凸面部对极片和隔膜进行辊压时，能够避免凸面部的锋利边缘或边缘的毛刺在辊压过程中损伤极片与隔膜的表面，可使极片与隔膜的辊压过程更加顺利。
在一些实施例中，凹面部为凹陷的曲面结构。
本申请实施例的技术方案中，当凹面部分别对极片和隔膜进行辊压时，能够避免凹面部的锋利边缘或边缘的毛刺在辊压过程中损伤极片与隔膜的表面，可使极片与隔膜的辊压过程更加顺利。
在一些实施例中，第一辊压面和第二辊压面中的一者上包括有凸面部，另一者上包括有凹面部，凸面部与凹面部沿第一压辊的轴线方向错开布置。
本申请实施例的技术方案中，分别在第一辊压面与第二辊压面中一者上设置凸面部，并在另一者上设置凹面部，能够提高第一辊压面与第二辊压面之间的高度差，从而加强极片和隔膜上与凸面部对应位置的粘结强度，并且在此基础上，确保极片和隔膜上与凹面部对应位置保持良好的粘结力。
第二方面，本申请提供一种复合极片，复合极片通过如上所述的辊压装置辊压形成，复合极片包括：
极片；
隔膜，层叠压合于极片上，以形成复合极片；
其中，复合极片上形成具有不同层叠厚度的层叠区域。
在一些实施例中，具有不同层叠厚度的层叠区域包括：
第一层叠区域；
第二层叠区域，第一层叠区域的层叠厚度小于第二层叠区域的层叠厚度，第一层叠区域处极片与隔膜之间的剥离力大于第二层叠区域处极片与隔膜之间的剥离力。
本申请实施例的技术方案中，第一层叠区域即为与第一辊压面及第二辊压面上高度较 高的位置所对应的区域，在该区域处，极片与隔膜受到更大的辊压力，从而极片与隔膜之间的剥离力更大，极片与隔膜自身粘结强度更高。第二层叠区域即为与第一辊压面及第二辊压面上高度较低的位置所对应的区域，在该区域处，极片与隔膜受到较小的辊压力，因此，极片与隔膜之间的剥离力更小。由此，由极片与隔膜辊压形成的复合极片在该区域处具有良好的粘结能力，以便于在后续工序中与外部结构进行粘结。
在一些实施例中，第一层叠区域的层叠厚度小于或等于第二层叠区域的层叠厚度的90％。
本申请实施例的技术方案中，一方面，能够避免第一层叠区域与第二层叠区域之间的层叠厚度差过大，导致极片与隔膜在受到第一层叠区域及第二层叠区域的辊压时在两个区域之间产生裂缝，导致极片与隔膜的结构受到损坏。另一方面，能够确保极片与隔膜受辊压之后，与第二层叠区域对应的位置上极片与隔膜之间粘结良好，并且在与第一层叠区域对应的位置上具有能够与外部结构稳定粘结的粘结能力。
在一些实施例中，第一层叠区域处极片与隔膜之间的剥离力大于或等于第二层叠区域处极片与隔膜之间的剥离力的150％。
本申请实施例的技术方案中，能够确保极片与隔膜之间自身粘结良好，避免复合极片在后续加工过程中出现分层现象。
第三方面，本申请提供一种电池单体，包括如上所述的复合极片。
第四方面，本申请提供一种用电装置，包括如上所述的电池单体，电池单体用于提供电能。
上述辊压装置、复合极片、电池单体以及用电装置，通过在第一辊压面和第二辊压面中至少一者上设置凸面部和/或凹面部，使得极片与隔膜经过辊压通道时，第一辊压面与第二辊压面之间形成的间隙较小的辊压缝隙处对极片与隔膜所施加的辊压力更大，极片与隔膜之间在该位置的粘性涂层被挤压，极片与隔膜在该位置的粘结更加牢固。而第一辊压面与第二辊压面之间形成的间隙较大的辊压缝隙处对极片与隔膜所施加的辊压力较小或者无辊压力，因此，极片与隔膜之间在该位置的粘性涂层被轻微挤压或者未被挤压，使得辊压所形成的复合极片在该位置处具有良好的粘结能力，以便于在后续叠片或者整形等工序时与外部结构进行粘结。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
通过阅读对下文实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人 员将变得清楚明了。附图仅用于示出实施方式的目的，而并不认为是对本申请的限制。而且在全部附图中，用相同的附图标号表示相同的部件。在附图中：
图1为本申请一实施例的辊压装置的结构示意图；
图2为本申请一实施例的第一压辊的侧面示意图；
图3为本申请一实施例的第二压辊的侧面示意图；
图4为本申请一实施例中第一压辊或第二压辊的侧面示意图；
图5为本申请另一实施例中第一压辊或第二压辊的侧面示意图；
图6为本申请一实施例的第一压辊或第二压辊的局部剖视图；
图7为本申请另一实施例的第一压辊或第二压辊的局部剖视图；
图8为本申请一实施例的第一压辊或第二压辊的局部剖视图；
图9为本申请另一实施例的第一压辊或第二压辊的局部剖视图。
附图标记说明：100、辊压装置；201、复合极片；10、第一压辊；20、第二压辊；30、辊压通道；11、第一辊压面；12、凸面部；13、凹面部；21、第二辊压面；111、第一曲面部；211、第二曲面部。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组” 指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
电池在制作过程中，需要将极片和隔膜进行复合叠片工艺，以形成复合极片。具体地，在隔膜表面涂覆一层粘性涂层，并将极片与隔膜层叠，使极片与隔膜经过辊压后进行复合。
将极片与隔膜复合后，还需要进行后续的多层叠片及整形等一系列工序。在后续工序中，例如在叠片过程中，需要对极片或隔膜再次进行粘结。然而，在对极片和隔膜进行辊压的过程中，压辊对极片和隔膜的所有位置进行辊压，导致辊压后的极片与隔膜上的粘性涂层被破坏而失去粘性。由此，在后续叠片或者整形等工序中，极片与隔膜上的粘性涂层无法发挥作用，导致电池单体整体粘接不良，从而影响电池的安全性能。
基于以上考虑，为了提高极片与隔膜上粘性涂层的粘结强度，发明人经过深入研究，设计了一种辊压装置，在对极片和隔膜进行辊压的过程中，使压辊表面的第一辊压部对极片与隔膜的部分区域进行压辊，通过第一辊压部所对应的区域使极片与隔膜整体稳定粘结。而极片和隔膜与压辊表面第二辊压部所对应的区域未受到挤压力，因此，该部分区域的粘性涂层保存完好，以便提高极片和隔膜在后续叠片或整形等工序中的粘结强度。由此，提高电池单体制作完成后整体的粘结牢固度，进而提高电池整体的安全性能。
需要说明的是，电池通常包括箱体和电池单体，电池单体容纳于箱体内。在电池中，电池单体可以是多个，多个电池单体之间可串联或并联或混联，混联是指多个电池单体中既有串联又有并联。多个电池单体之间可直接串联或并联或混联在一起，再将多个电池单体构成的整体容纳于箱体内。当然，电池也可以是多个电池单体先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体内。电池还可以包 括其他结构，例如，还可以包括汇流部件，用于实现多个电池单体之间的电连接。
其中，每个电池单体可以为二次电池或一次电池，还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。电池单体可呈圆柱体、扁平体、长方体或其它形状等。
电池单体是组成电池的最小单元，对于电池单体而言，其包括端盖、壳体、电芯组件以及其他功能性部件。其中，端盖与壳体共同围合形成用于容纳电芯组件和其他功能性部件的容纳空间。而电芯组件是电池单体中发生电化学反应的部件，容纳空间内可以容纳一个或更多个电芯组件。
具体地，电芯组件主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电芯组件的主体部，正极片和负极片不具有活性物质的部分各自构成极耳。正极极耳和负极极耳可以共同位于主体部的一端或是分别位于主体部的两端。在电池的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳连接电极端子以形成电流回路。
参阅图1、图2以及图3，图1为本申请一实施例的辊压装置的结构示意图，图2为本申请一实施例的第一压辊的侧面示意图，图3为本申请一实施例的第二压辊的侧面示意图。本申请一实施例提供了一种用于将极片与隔膜辊压成复合极片201的辊压装置100，包括第一压辊10及第二压辊20。其中，第一压辊10可转动地设置，且具有第一辊压面11。第二压辊20可转动地设置，且沿第一压辊10的径向方向，并排布置于第一压辊10的一侧。第二压辊20具有朝向第一辊压面11的第二辊压面21，第一辊压面11与第二辊压面21之间形成用于辊压复合极片与隔膜的辊压通道30。此外，第一辊压面11和第二辊压面21中至少一者上设置有凸面部12和/或凹面部13，以使得第一辊压面11与第二辊压面21之间形成多个间隙大小不同的辊压缝隙，以使复合极片201上形成不同厚度的层叠区域。
需要说明的是，第一压辊10与第二压辊20分别被构造为圆柱体压辊结构，且第一压辊10和第二压辊20均为可转动地设置。具体地，第一压辊10和第二压辊20的轴线相互平行，并且可将两者分别设置于外部结构上，使得第一压辊10和第二压辊20沿径向并排设置，以便于在两者之间形成辊压通道30。可以理解地，辊压通道30的间距大小可根据实际使用情况进行设定，例如可根据辊压形成的复合极片201的最终厚度进行设定，使得极片与隔膜经过辊压通道30后所形成的复合极片201符合目标厚度。
具体地，可以在第一辊压面11或者第二辊压面21上设置凸面部12，也可以在第一辊压面11或者第二辊压面21上设置凹面部13。同样可以在第一辊压面11与第二辊压面21上同时设置凸面部12，或者在第一辊压面11与第二辊压面21上同时设置凹面部13。当然，也可以在第一辊压面11与第二辊压面21上分别设置凸面部12与凹面部13。需要注意的是，当第一辊压面11与第二辊压面21上同时设置凸面部12与凹面部13时，第一辊压面11上的凸面部12应与第二辊压面21上的凸面部12正对设置，第一辊压面11上的凹面部13应与第 二辊压面21上的凹面部13正对设置。
然而，由于第一压辊10与第二压辊20设置时的机械误差，导致第一辊压面11上的凸面部12与第二辊压面21上的凸面部12之间可能存在一定的偏移，同样地，第一辊压面11上的凹面部13与第二辊压面21上的凹面部13之间也可能存在一定的偏移。基于此，作为一种优选的实施例，可在第一辊压面11和第二辊压面21中的一者上设置凸面部12或者凹面部13。由此，可使凸面部12或凹面部13与极片和隔膜上对应位置之间的压合更加准确。
在一些实施例中，通过在第一辊压面11和第二辊压面21中至少一者上设置凸面部12和/或凹面部13，使得极片与隔膜经过辊压通道30时，极片与隔膜的不同位置所受到的第一压辊10及第二压辊20的辊压力大小不同，从而在复合极片201上形成不同厚度的层叠区域。其中，极片与隔膜上受到较大辊压力的区域在形成复合极片201后具有较小的粘结力，而极片与隔膜上受到较小辊压力的区域在形成复合极片201后具有较大的粘结力。由此，使得复合极片201在后续工序中仍然保持良好的粘结力。
当层叠设置的极片与隔膜经过辊压通道30时，第一辊压面11与第二辊压面21之间形成的间隙较小的辊压缝隙处对极片与隔膜所施加的辊压力更大，极片与隔膜之间在该位置的粘性涂层被挤压，极片与隔膜在该位置的粘结更加牢固。而第一辊压面11与第二辊压面21之间形成的间隙较大的辊压缝隙处对极片与隔膜所施加的辊压力较小或者无辊压力，因此，极片与隔膜之间在该位置的粘性涂层被轻微挤压或者未被挤压，使得辊压所形成的复合极片201在该位置处具有良好的粘结能力，以便于在后续叠片或者整形等工序时与外部结构进行粘结。
在一些实施例中，第一辊压面11上设置有多个凸面部12和/或多个凹面部13。
多个凸面部12及多个凹面部13的设置，能够使经过辊压复合后的复合极片201上不同厚度的层叠区域的分布范围更广，使复合极片201上具有不同粘结力的区域位置分布更广。
在一些实施例中，多个凸面部12和多个凹面部13中至少一者沿第一压辊10的周向均匀分布于第一辊压面11上。
由此，极片与隔膜上分别与凸面部12及凹面部13对应的区域均沿第一压辊10的周向均匀分布。一方面，使极片与隔膜自身结构更加稳定。另一方面，使得极片与隔膜经过辊压形成的复合极片201在后续与其他结构进行粘结时更加稳定。
在一些实施例中，多个凸面部12和多个凹面部13中至少一者沿第一压辊10的轴向均匀分布于第一辊压面11上。
由此，极片与隔膜上分别与凸面部12及凹面部13对应的区域均沿第一压辊10的轴向均匀分布。一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片201在后续与其他结构进行粘结时更加稳定。
在一些实施例中，第二辊压面21上设置有多个凸面部12和/或多个凹面部13。
多个凸面部12及多个凹面部13的设置，能够使经过辊压复合后的复合极片201上不同厚度的层叠区域的分布范围更广，使复合极片201上具有不同粘结力的区域位置分布更广。
在一些实施例中，多个凸面部12和多个凹面部13中至少一者沿第二压辊20的周向均匀分布于第二辊压面21上。
由此，极片与隔膜上分别与凸面部12及凹面部13对应的区域均沿第二压辊20的周向均匀分布。一方面，使极片与隔膜自身结构更加稳定。另一方面，使得极片与隔膜经过辊压形成的复合极片201在后续与其他结构进行粘结时更加稳定。
在一些实施例中，多个凸面部12和多个凹面部13中至少一者沿第二压辊20的轴向均匀分布于第二辊压面21上。
由此，极片与隔膜上分别与凸面部12及凹面部13对应的区域均沿第二压辊20的轴向均匀分布。一方面，使极片与隔膜自身结构更加稳定，另一方面，使得极片与隔膜经过辊压形成的复合极片201在后续与其他结构进行粘结时更加稳定。
在一些实施例中，第一辊压面11和第二辊压面21中至少一者上未设置凸面部12和/或凹面部13的位置总面积与凸面部12和/或凹面部13的总面积的比值范围为0.1-10。
当第一辊压面11上设置凸面部12时，第一辊压面11上未设置凸面部12的位置的总面积与凸面部12的总面积的比值范围为0.1-10。当第一辊压面11上设置凹面部13时，第一辊压面11上未设置凹面部13的位置的总面积与凹面部13的总面积的比值范围为0.1-10。
同样地，当第二辊压面21上设置凸面部12时，第二辊压面21上未设置凸面部12的位置的总面积与凸面部12的总面积的比值范围为0.1-10。当第二辊压面21上设置凹面部13时，第二辊压面21上未设置凹面部13的位置的总面积与凹面部13的总面积的比值范围为0.1-10。
如图4所示，图4为本申请一实施例中第一压辊或第二压辊的侧面示意图。作为一种具体的实施例，当第一辊压面11和/或第二辊压面21上设置凸面部12，且未设置凸面部12的位置的总面积与凸面部12的总面积的比值为1时，凸面部12的直径为5.94毫米(mm)，每两个相邻凸面部12中心点之间的间距为8mm。
如图5所示，图5为本申请另一实施例中第一压辊或第二压辊的侧面示意图。作为另一种具体地实施例，当第一辊压面11和/或第二辊压面21上设置凹面部13，且未设置凹面部13的位置的总面积与凹面部13的总面积的比值为1时，凹面部13的直径为5.94mm，每两个相邻凹面部13中心点之间的间距为8mm。
由此，可以理解地，第一辊压面11和/或第二辊压面21上未设置凸面部12和/或凹面部13的位置总面积与凸面部12和/或凹面部13的总面积的比值可根据实际需求进行调整，在此不做赘述。
此外，凸面部12的高度或者凹面部13的深度均可以根据实际辊压需求进行相应的调 整，以获得具有不同厚度区域的复合极片201。
由此，当极片与隔膜经过辊压通道30时，使得极片与隔膜之间被挤压而相互粘结的位置的总面积和两者之间未被挤压或被轻微挤压而具有良好粘结能力的位置的总面积之间的比值固定，从而确保极片与隔膜之间粘结稳定之外，还能够确保辊压形成的复合极片201中的隔膜在后续整形过程中保持良好的粘结力，从而使得复合极片201的各部分之间在后续整形过程中能够稳定粘合。
请一并参看图6，图6为本申请一实施例的第一压辊或第二压辊的局部剖视图。在一些实施例中，第一辊压面11包括第一曲面部111以及与第一曲面部111圆滑过渡连接的多个凸面部12和/或多个凹面部13，即第一曲面部111与多个凸面部12和/或凹面部13共同形成第一辊压面11，
当第一辊压面11上设置多个凸面部12时，第一曲面部111与多个凸面部12共同形成第一辊压面11。当第一辊压面11上设置多个凹面部13时，第一曲面部111与多个凹面部13共同形成第一辊压面11。当第一辊压面11上同时设置多个凸面部12及多个凹面部13时，第一曲面部111与多个凸面部12和凹面部13共同形成第一辊压面11。
当第一辊压面11上设置有多个凸面部12时，第一辊压面11上除全部凸面部12之外的部分被构造为第一曲面部111。由此，凸面部12与第一曲面部111之间形成高度差，即在第一辊压面11与第二辊压面21之间形成多个间隙大小不同的辊压缝隙。此外，凸面部12与第一曲面部111对经过辊压通道30的极片与隔膜施加大小不同的辊压力，凸面部12对极片与隔膜施加的辊压力更大，而第一曲面部111对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在凸面部12位置的剥离力更大，而在第一曲面部111位置的剥离力更小，即极片和隔膜在与凸面部12位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片201在与第一曲面部111位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜良好粘结的基础上，提高复合极片201在后续工序中的粘结能力。
同理，当第一辊压面11上设置有多个凹面部13时，第一辊压面11上除全部凹面部13之外的部分被构造为第一曲面部111。由此，凹面部13与第一曲面部111之间形成高度差，即在第一辊压面11与第二辊压面21之间形成多个间隙大小不同的辊压缝隙。此外，凹面部13与第一曲面部111对经过辊压通道30的极片与隔膜施加大小不同的辊压力。第一曲面部111对极片与隔膜施加的辊压力更大，而凹面部13对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在第一曲面部111位置的剥离力更大，而在凹面部13位置的剥离力更小，即极片和隔膜在与第一曲面部111位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片201在与凹面部13位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜稳定粘结的 基础上，使得复合极片201中的隔膜在后续整形过程中粘结力发挥良好，以使复合极片201的各部分之间在后续整形过程中能够稳定粘合。
需要说明的是，凸面部12的形状可以是任意形状，具体形状可根据实际需求进行选择。为了便于说明，本实施例中以圆形凸面部为例进行展示。可以理解地，在一些其他的实施例中，凸面部也可以设置为椭圆形凸面部或方形凸面部或其他结构的凸面部，在此不做赘述。
此外，凸面部12可以设置为沿第一压辊10和/或第二压辊20的周向间隔且均匀设置的多个凸起结构，也可以设置为沿第一压辊10和/或第二压辊20的周向连续分布的凸条，具体结构可根据实际需求进行相应的调整，在此不做赘述。
在一些实施例中，凸面部12可以设置为沿第一压辊10和/或第二压辊20的轴向间隔且均匀设置的多个凸起结构，也可以设置为沿第一压辊10和/或第二压辊20的轴向连续分布的凸条，具体结构可根据实际需求进行相应的调整，在此不做赘述。
请参看图7，图7为本申请另一实施例的第一压辊或第二压辊的局部剖视图。在一些实施例中，第二辊压面21包括第二曲面部211以及与第二曲面部211圆滑过渡连接的多个凸面部12和/或多个凹面部13，即第二曲面部211与多个凸面部12和/或多个凹面部13共同形成第二辊压面21。
当第二辊压面21上设置多个凸面部12时，第二曲面部211与多个凸面部12共同形成第二辊压面21。当第二辊压面21上设置多个凹面部13时，第二曲面部211与多个凹面部13共同形成第二辊压面21。当第二辊压面21上同时设置多个凸面部12及多个凹面部13时，第二曲面部211与多个凸面部12和凹面部13共同形成第二辊压面21。
当第二辊压面21上设置有多个凸面部12时，第二辊压面21上除全部凸面部12之外的部分被构造为第二曲面部211。由此，凸面部12与第二曲面部211之间形成高度差，即在第一辊压面11与第二辊压面21之间形成多个间隙大小不同的辊压缝隙。此外，凸面部12与第二曲面部211对经过辊压通道30的极片与隔膜施加大小不同的辊压力，凸面部12对极片与隔膜施加的辊压力更大，而第二曲面部211对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在凸面部12位置的剥离力更大，而在第二曲面部211位置的剥离力更小，即极片和隔膜在与凸面部12位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片201在与第二曲面部211位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜稳定粘结的基础上，使得复合极片201中的隔膜在后续整形过程中粘结力发挥良好，以使复合极片201的各部分之间在后续整形过程中能够稳定粘合。
同理，当第二辊压面21上设置有多个凹面部13时，第二辊压面21上除全部凹面部13之外的部分被构造为第二曲面部211。由此，凹面部13与第二曲面部211之间形成高度差， 即在第一辊压面11与第二辊压面21之间形成多个间隙大小不同的辊压缝隙。此外，凹面部13与第二曲面部211对经过辊压通道30的极片与隔膜施加大小不同的辊压力，第二曲面部211对极片与隔膜施加的辊压力更大，而凹面部13对极片与隔膜施加的辊压力较小。因此，极片与隔膜之间在第二曲面部211位置的剥离力更大，而在凹面部13位置的剥离力更小，即极片和隔膜在与第二曲面部211位置对应的部分粘结力更大，从而确保极片与隔膜的良好粘结。此外，极片和隔膜经过辊压复合后形成的复合极片201在与凹面部13位置对应的部分自身粘结力较小，但能够与外部结构之间形成良好的粘结。从而在确保极片与隔膜稳定粘结的基础上，使得复合极片201中的隔膜在后续整形过程中粘结力发挥良好，以使复合极片201的各部分之间在后续整形过程中能够稳定粘合。
需要说明的是，凹面部13的形状可以是任意形状，具体形状可根据实际需求进行选择。为了便于说明，本实施例中以圆形凹面部为例进行展示，即凹面部被构造为圆形凹槽结构。可以理解地，在一些其他的实施例中，凹面部13也可以设置为椭圆形凹面部或方形凹面部或其他结构的凹面部，在此不做赘述。
此外，凹面部13可以设置为沿第一压辊10和/或第二压辊20的周向间隔且均匀设置的多个凹陷结构，也可以设置为沿第一压辊10和/或第二压辊20的周向连续分布的凹槽通道，具体结构可根据实际需求进行相应的调整，在此不做赘述。
在一些实施例中，凹面部13可以设置为沿第一压辊10和/或第二压辊20的轴向间隔且均匀设置的多个凹陷结构，也可以设置为沿第一压辊10和/或第二压辊20的轴向连续分布的凹槽通道，具体结构可根据实际需求进行相应的调整，在此不做赘述。
请参看图8及图9，图8为本申请一实施例的第一压辊或第二压辊的局部剖视图，图9为本申请另一实施例的第一压辊或第二压辊的局部剖视图。在一些实施例中，凸面部12为凸起的曲面结构。由此，当凸面部12对极片和隔膜进行辊压时，能够避免凸面部12的锋利边缘或边缘的毛刺在辊压过程中损伤极片与隔膜的表面，可使极片与隔膜的辊压过程更加顺利。
在一些实施例中，凹面部13为凹陷的曲面结构。由此，当凹面部13对极片和隔膜进行辊压时，能够避免凹面部13的锋利边缘或边缘的毛刺在辊压过程中损伤极片与隔膜的表面，可使极片与隔膜的辊压过程更加顺利。
在一些实施例中，第一辊压面11和第二辊压面21中的一者上包括有凸面部12，另一者上包括有凹面部13，凸面部12与凹面部13沿第一压辊10的轴线方向错开布置。
由此，凸面部12与另一压辊的表面相互配合，对极片与隔膜上部分区域进行挤压，使极片与隔膜在该区域位置进行粘结。凹面部13与另一压辊的表面相互配合，使极片与隔膜上对应的区域在辊压过程中不受挤压力，或者受到较小的挤压力。由此，极片与隔膜上该区域的粘性涂层保持良好的粘接能力，以便经过辊压形成的复合极片201在后续与外部结构再 次进行粘结。
分别在第一辊压面11和第二辊压面21中的一者上设置凸面部12，另一者上设置凹面部13，能够提高第一辊压面11和第二辊压面21之间的高度差，从而加强极片和隔膜上与凸面部12对应位置的粘结强度，并且在此基础上，确保极片和隔膜上与凹面部13对应位置保持良好的粘结力。
基于与上述辊压装置100相同的构思，本申请提供一种复合极片201，通过如上所述的辊压装置辊压形成。复合极片201包括极片及层叠压合于极片上的隔膜，极片与隔膜共同形成复合极片201。其中，复合极片201上形成具有不同层叠厚度的层叠区域。
在一些实施例中，具有不同层叠厚度的层叠区域包括第一层叠区域及第二层叠区域。第一层叠区域的层叠厚度小于第二层叠区域的层叠厚度，第一层叠区域处极片与隔膜之间的剥离力大于第二层叠区域处极片与隔膜之间的剥离力。
第一层叠区域即为与第一辊压面11及第二辊压面21上高度较高的位置所对应的区域，在该区域处，极片与隔膜受到更大的辊压力，从而极片与隔膜之间的剥离力更大，极片与隔膜自身粘结强度更高。第二层叠区域即为与第一辊压面11及第二辊压面21上高度较低的位置所对应的区域，在该区域处，极片与隔膜受到较小的辊压力，因此，极片与隔膜之间的剥离力更小。由此，使得复合极片201中的隔膜在后续整形过程中粘结力发挥良好，以使复合极片201的各部分之间在后续整形过程中能够稳定粘合。
在一些实施例中，第一层叠区域的层叠厚度小于或等于第二层叠区域的层叠厚度的90％。
一方面，能够避免第一层叠区域与第二层叠区域之间的层叠厚度差过大，导致极片与隔膜在受到第一层叠区域及第二层叠区域的辊压时在两个区域之间产生裂缝，导致极片与隔膜的结构受到损坏。
另一方面，能够确保极片与隔膜受辊压之后，与第二层叠区域对应的位置上极片与隔膜之间粘结良好，并且在与第一层叠区域对应的位置上具有能够与外部结构稳定粘结的粘结能力。
在一些实施例中，第一层叠区域处极片与隔膜之间的剥离力大于或等于第二层叠区域处极片与隔膜之间的剥离力的150％。
由此，能够确保极片与隔膜之间自身粘结良好，避免复合极片201在后续加工过程中出现分层现象。
基于与上述复合极片201相同的构思，本申请提供一种电池单体，包括如上所述的复合极片201。
由于上述复合极片201具有符合要求的不同厚度区域，当复合极片201应用于电池单体中时，可提高电池单体整体结构的完整性，从而提高电池单体的安全性能。
基于与上述电池单体相同的构思，本申请提供一种用电装置，包括如上所述的电池单体，电池单体用于提供电能。
本申请具体使用时，层叠设置的极片和隔膜从辊压通道30中经过，第一辊压面11与第二辊压面21之间形成的间隙较小的辊压缝隙处对极片与隔膜所施加的辊压力更大，极片与隔膜之间在该位置的粘性涂层被挤压，极片与隔膜在该位置的粘结更加牢固。而第一辊压面11与第二辊压面21之间形成的间隙较大的辊压缝隙处对极片与隔膜所施加的辊压力较小或者无辊压力。因此，极片与隔膜之间在该位置的粘性涂层被轻微挤压或者未被挤压，使得复合极片201中的隔膜在后续整形过程中粘结力发挥良好，以使复合极片201的各部分之间在后续整形过程中能够稳定粘合。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (19)

  1. 一种辊压装置，用于将极片与隔膜辊压成复合极片，所述辊压装置包括：
    第一压辊，所述第一压辊可转动地设置，所述第一压辊具有第一辊压面；及
    第二压辊，所述第二压辊可转动地设置，且沿所述第一压辊的径向方向，并排布置于所述第一压辊的一侧，所述第二压辊具有朝向所述第一辊压面的第二辊压面，所述第一辊压面与所述第二辊压面之间形成用于辊压复合所述极片与所述隔膜的辊压通道；
    其中，所述第一辊压面和所述第二辊压面中至少一者上设置有凸面部和/或凹面部，以使得所述第一辊压面与所述第二辊压面之间形成多个间隙大小不同的辊压缝隙，以使所述复合极片上形成不同厚度的层叠区域。
  2. 根据权利要求1所述的辊压装置，其中，所述第一辊压面上设置有多个所述凸面部和/或多个所述凹面部。
  3. 根据权利要求2所述的辊压装置，其中，多个所述凸面部和多个所述凹面部中至少一者沿所述第一压辊的周向均匀分布于所述第一辊压面上。
  4. 根据权利要求2或3所述的辊压装置，其中，多个所述凸面部和多个所述凹面部中至少一者沿所述第一压辊的轴向均匀分布于所述第一辊压面上。
  5. 根据权利要求1-4任一项所述的辊压装置，其中，所述第二辊压面上设置有多个所述凸面部和/或多个所述凹面部。
  6. 根据权利要求5所述的辊压装置，其中，多个所述凸面部和多个所述凹面部中至少一者沿所述第二压辊的周向均匀分布于所述第二辊压面上。
  7. 根据权利要求5或6所述的辊压装置，其中，多个所述凸面部和多个所述凹面部中至少一者沿所述第二压辊的轴向均匀分布于所述第二辊压面上。
  8. 根据权利要求1-7任一项所述的辊压装置，其中，所述第一辊压面和所述第二辊压面中至少一者上未设置所述凸面部和/或所述凹面部的位置总面积与所述凸面部和/或所述凹面部的总面积的比值范围为0.1-10。
  9. 根据权利要求1-8任一项所述的辊压装置，其中，所述第一辊压面包括第一曲面部以及与所述第一曲面部圆滑过渡连接的多个所述凸面部和/或多个所述凹面部。
  10. 根据权利要求1-9任一项所述的辊压装置，其中，所述第二辊压面包括第二曲面部以及与所述第二曲面部圆滑过渡连接的多个所述凸面部和/或多个所述凹面部。
  11. 根据权利要求1-10任一项所述的辊压装置，其中，所述凸面部为凸起的曲面结构。
  12. 根据权利要求1-11任一项所述的辊压装置，其中，所述凹面部为凹陷的曲面结构。
  13. 根据权利要求1-12任一项所述的辊压装置，其中，所述第一辊压面和所述第二辊压面中的一者上包括有所述凸面部，另一者上包括有所述凹面部，所述凸面部与所述凹面部沿 所述第一压辊的轴线方向错开布置。
  14. 一种复合极片，其中，所述复合极片通过权利要求1-13任意一项所述的辊压装置辊压形成，所述复合极片包括：
    极片；
    隔膜，层叠压合于所述极片上，以形成所述复合极片；
    其中，所述复合极片上形成有具有不同层叠厚度的层叠区域。
  15. 根据权利要求14所述的复合极片，其中，所述具有不同层叠厚度的层叠区域包括：
    第一层叠区域；
    第二层叠区域，所述第一层叠区域的层叠厚度小于所述第二层叠区域的层叠厚度，所述第一层叠区域处所述极片与所述隔膜之间的剥离力大于所述第二层叠区域处所述极片与所述隔膜之间的剥离力。
  16. 根据权利要求15所述的复合极片，其中，所述第一层叠区域的层叠厚度小于或等于所述第二层叠区域的层叠厚度的90％。
  17. 根据权利要求15或16所述的复合极片，其中，所述第一层叠区域处所述极片与所述隔膜之间的剥离力大于或等于所述第二层叠区域处所述极片与所述隔膜之间的剥离力的150％。
  18. 一种电池单体，其中，包括如权利要求14-17任意一项所述的复合极片。
  19. 一种用电装置，其中，包括如权利要求18所述的电池单体，所述电池单体用于提供电能。
PCT/CN2022/112355 2022-07-12 2022-08-15 辊压装置、复合极片、电池单体及用电装置 WO2024011703A1 (zh)

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JP2013069637A (ja) * 2011-09-26 2013-04-18 Nissan Motor Co Ltd 帯状電極の製造装置および製造方法
CN109244371A (zh) * 2018-10-16 2019-01-18 深圳吉阳智能科技有限公司 电池极片热复合设备
CN214957021U (zh) * 2021-04-16 2021-11-30 深圳吉阳智能科技有限公司 一种热复合辊组及热复合设备

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715360A (en) * 1980-07-02 1982-01-26 Matsushita Electric Ind Co Ltd Manufacture of electrode for lead battery
JP2013069637A (ja) * 2011-09-26 2013-04-18 Nissan Motor Co Ltd 帯状電極の製造装置および製造方法
CN109244371A (zh) * 2018-10-16 2019-01-18 深圳吉阳智能科技有限公司 电池极片热复合设备
CN214957021U (zh) * 2021-04-16 2021-11-30 深圳吉阳智能科技有限公司 一种热复合辊组及热复合设备

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