WO2023137724A1 - 极片输送机构及极片成型系统 - Google Patents

极片输送机构及极片成型系统 Download PDF

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Publication number
WO2023137724A1
WO2023137724A1 PCT/CN2022/073302 CN2022073302W WO2023137724A1 WO 2023137724 A1 WO2023137724 A1 WO 2023137724A1 CN 2022073302 W CN2022073302 W CN 2022073302W WO 2023137724 A1 WO2023137724 A1 WO 2023137724A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
roller
conveying roller
cylinder
conveying
Prior art date
Application number
PCT/CN2022/073302
Other languages
English (en)
French (fr)
Inventor
张聪
文志华
郭益泰
张永力
史云茹
黄国达
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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Publication date
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 CN202280016804.3A priority Critical patent/CN116888804A/zh
Priority to PCT/CN2022/073302 priority patent/WO2023137724A1/zh
Publication of WO2023137724A1 publication Critical patent/WO2023137724A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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 technical field of batteries, in particular to a pole piece conveying mechanism and a pole piece forming system.
  • the battery includes an electrode assembly, and the electrode assembly can be a positive pole piece and a negative pole piece wound.
  • the purpose of this application is to provide a pole piece conveying mechanism and a pole piece forming system, which can improve the utilization rate of materials and reduce production costs.
  • the present application provides a pole piece conveying mechanism, including: a first conveying roller, used to convey the pole piece; and a negative pressure providing unit, arranged at at least one end of the first conveying roller, along the axial direction of the first conveying roller, the negative pressure providing unit is spaced apart from the first conveying roller, and the negative pressure providing unit is used to form a negative pressure around the tab of the pole piece, so as to prevent the tab from turning over.
  • a negative pressure providing unit is provided at at least one end of the first conveying roller, and a negative pressure is formed around the tab of the pole piece through the negative pressure providing unit to reduce air resistance, thereby reducing the probability of the tab being folded.
  • the negative pressure providing unit is arranged at intervals from the first conveying roller to avoid friction with the pole lug to generate dust, ensure product quality, thereby improving material utilization and reducing production costs.
  • the negative pressure providing unit is an air amplifier
  • the air amplifier includes a drainage chamber, an amplification chamber communicated with the drainage chamber, and an air inlet for delivering compressed gas to the amplification chamber
  • the drainage chamber is close to the first conveying roller relative to the amplification chamber
  • the drainage chamber has a suction port facing the first conveying roller
  • the amplification chamber has an exhaust port facing away from the first conveying roller.
  • the negative pressure supply unit is an air amplifier, and a small part of compressed gas is input through the air inlet, so that the drainage chamber can introduce dozens of times the external air into the amplification chamber through the suction port and discharge it, forming a functional area that blows on one side and sucks on the other side.
  • the air around the tabs can be drained to the exhaust port of the amplification chamber, forming a local negative pressure around the tabs, reducing air resistance, thereby reducing the probability of tabs being folded, and improving the utilization rate of materials.
  • the air amplifier has a simple structure, occupies a small space, is only driven by compressed gas, has low energy consumption, and is safe to use.
  • the air amplifier includes a first cylinder and a second cylinder, part of the first cylinder is sleeved outside the second cylinder, the inside of the second cylinder forms the amplification chamber, the part of the first cylinder that is not sleeved on the second cylinder forms the drainage chamber, the air inlet is arranged on the outer peripheral surface of the first cylinder and runs through the first cylinder, the end of the first cylinder far away from the second cylinder forms the suction port, and the end of the second cylinder far away from the first cylinder forms the suction port.
  • an annular airflow chamber is formed between the inner peripheral surface of the first cylinder and the outer peripheral surface of the second cylinder, and the compressed gas input from the air inlet enters the amplifying chamber after passing through the annular airflow chamber.
  • the first cylinder is sleeved on the outside of the second cylinder, which has a simple structure and is easy to assemble.
  • the first cylinder is rotatably sleeved on the outside of the second cylinder, the inner wall of the first cylinder is formed with an annular boss, and an annular gap is formed between the end of the second cylinder located in the first cylinder and the annular boss, the annular gap communicates with the annular airflow chamber, and the compressed gas in the annular airflow chamber enters the amplification chamber through the annular gap.
  • the size of the annular gap can be adjusted, and then the negative pressure value in the tab area can be adjusted, that is, the degree of smoothing the tab can be adjusted to adapt to tabs of different thicknesses and shapes, and to adapt to first conveying rollers of different diameters.
  • the pole piece conveying mechanism further includes: a first bracket and a second bracket, the second bracket is movably connected to the first bracket, the first conveying roller is rotatably connected to the first bracket, and the negative pressure providing unit is movably connected to the second bracket.
  • the positioning support of the first conveying roller is realized by the first support to ensure the stable conveyance of the first conveying roller to the pole piece
  • the positioning support of the negative pressure providing unit is realized by the second support so as to form a stable negative pressure environment around the tab.
  • the second bracket is provided with a first strip-shaped hole extending along the thickness direction of the pole piece
  • the pole piece conveying mechanism further includes: a first adjustment piece, the first adjustment piece is connected to the negative pressure providing unit, and the first adjustment piece can be movably inserted in the first strip-shaped hole; a first locking piece, the first locking piece is used to connect with the first adjustment piece, so as to lock the negative pressure supply unit to the second bracket.
  • the position of the negative pressure providing unit in the thickness direction of the pole piece is adjusted to adapt to pole pieces of different thicknesses and shapes, and to adapt to first conveying rollers of different diameters.
  • the second support is provided with a second strip-shaped hole extending axially along the first conveying roller
  • the pole piece conveying mechanism further includes: a second adjustment member, the second adjustment member is connected to the first support, and the second adjustment member can be movably passed through the second strip-shaped hole; a second locking member, the second locking member is used to connect with the second adjustment member, so as to lock the first support to the second support.
  • the position of the negative pressure providing unit relative to the first support along the axial direction of the first conveying roller is adjusted to adapt to pole pieces of different thicknesses and shapes, and to adapt to first conveying rollers of different diameters.
  • the pole piece includes a main body and a pole lug protruding from the main body
  • the first conveying roller includes a first roller section and a second roller section sequentially connected along its axial direction, the diameter of the first roller section is larger than the diameter of the second roller section, the first roller section is used to transport the main body, and the second roller section is used to correspond to the pole ear.
  • the diameter of the second roll section corresponding to the tab is smaller than the diameter of the first roll section corresponding to the main body, and the tab does not contact the second roll section.
  • the tab will not impact the roll surface of the second roll section, and will not damage the tab.
  • the tab passes through the first conveying roller, the tab will not scrape against the roll surface of the second roll section, and will not generate dust, which improves the quality of the electrode assembly formed by the pole piece.
  • the diameter difference between the first roll segment and the second roll segment is 2-10mm.
  • the diameter difference between the first roll section and the second roll section is 2-10 mm, and a step is formed between the first roll section and the second roll section.
  • the pole piece enters the roll it can prevent the tab from impacting the roll surface of the second roll section;
  • the pole piece conveying mechanism further includes: a second conveying roller disposed opposite to the first conveying roller and forming a gap therebetween for the pole piece to pass through.
  • the pole piece is conveyed through the cooperation of the second conveying roller and the first conveying roller, so as to ensure stable conveyance of the pole piece.
  • the central axis of the negative pressure providing unit is parallel to the central axis of the first conveying roller, and is located between the first conveying roller and the second conveying roller.
  • the central axis of the negative pressure supply unit is located between the first conveying roller and the second conveying roller, so as to ensure balanced force on both sides in the thickness direction of the tab and prevent the tab from turning over.
  • the length of the second conveying roller is shorter than the length of the first conveying roller, and the projection of the second conveying roller on the pole piece coincides with the first roller section.
  • the length of the second conveying roller is shorter than the length of the first conveying roller, and the projection of the second conveying roller on the first conveying roller overlaps with the first roller section, so that the second conveying roller cooperates with the first conveying roller to ensure stable pole piece conveying, and the second conveying roller is not in contact with the tab, so as to prevent the tab from scraping the surface of the second conveying roller and damage the tab.
  • the second conveying roller includes a third roller section corresponding to the first roller section and a fourth roller section corresponding to the second roller section, the fourth roller section is connected to the third roller section, the diameter of the fourth roller section is smaller than the diameter of the third roller section, the third roller section is used to transport the main body, and the fourth roller section is used to correspond to the tab.
  • the structure of the second conveying roller is the same as that of the first conveying roller, the space formed between the fourth roller section and the second roller section is used to accommodate the tab, and the tab is not in contact with the second roller section and the fourth roller section, but when the air flow at the tab is too large, the second roller section and the fourth roller section can support the tab and prevent the tab from being folded.
  • At least one of the first conveying roller and the second conveying roller is a driven roller.
  • At least one of the first conveying roller and the second conveying roller is a driven roller, which facilitates the conveyance of the pole piece.
  • the present application provides a pole piece conveying device, which includes: an unwinding mechanism for unwinding the pole piece; a winding mechanism for winding the pole piece; the pole piece conveying mechanism according to any of the above solutions, the conveying mechanism is arranged between the unwinding mechanism and the winding mechanism.
  • Fig. 1 is a schematic structural diagram of a pole piece conveying mechanism provided by some embodiments of the present application
  • Fig. 2 is a working principle diagram of the negative pressure providing unit provided by some embodiments of the present application.
  • Fig. 3 is a cross-sectional view of a negative pressure providing unit provided by some embodiments of the present application.
  • Fig. 4 is a partial enlarged view of place A in Fig. 3;
  • Fig. 5 is a schematic diagram of the assembly of the first bracket and the second bracket provided by some embodiments of the present application;
  • Fig. 6 is a schematic diagram of the assembly of the negative pressure adjustment unit and the second bracket provided by some embodiments of the present application;
  • Fig. 7 is a schematic structural diagram of a pole piece conveying mechanism provided by other embodiments of the present application.
  • Fig. 8 is a schematic diagram of cooperation between the second conveying roller and the first conveying roller provided in some embodiments of the present application;
  • Marking description 100-electrode conveying mechanism; 10-first conveying roller; 11-first roller section; 12-second roller section; 20-negative pressure supply unit; 21-drainage cavity; 22-amplification cavity; -Adjustment ring; 31-the first bracket; 311-the first bottom plate; 312-the first side plate; 32-the second bracket; 321-the second bottom plate; 322-the second side plate; 323-the first strip hole; Locking member; 50-second conveying roller; 51-third roller section; 52-fourth roller section; P-pole piece; P1-main body; P2-pole ear.
  • orientations or positional relationships indicated by the terms “center”, “length”, “width”, “thickness”, “bottom”, “inner”, “outer”, and “circumferential” are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and therefore cannot be construed as limiting the application.
  • first and “second” in the specification and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific sequence, and may include one or more of these features explicitly or implicitly.
  • “plurality” means two or more.
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediary, or it may be an internal connection between two components.
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive pole piece, a negative pole piece and a diaphragm.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector that is not coated with the positive electrode active material layer protrudes from the current collector that has been coated with the positive electrode active material layer.
  • the current collector that is not coated with the positive electrode active material layer serves as the positive electrode ear.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector that is not coated with the negative electrode active material layer protrudes from the current collector that has been coated with the negative electrode active material layer.
  • the current collector that is not coated with the negative electrode active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the diaphragm can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the wound electrode assembly includes a positive pole piece and a negative pole piece wound in layers, and a separator is arranged between the positive pole piece and the negative pole piece to insulate and isolate the positive pole piece and the negative pole piece.
  • the positive pole piece and the negative pole piece are roll materials. During the winding and forming process of the electrode assembly, both the positive pole piece and the negative pole piece need to be transported to the winding equipment.
  • the pole piece includes a main body and a pole ear protruding from the main body.
  • the pole piece Before the electrode assembly is wound and formed, the pole piece needs to be transported over a long distance. During the transportation process, it needs to be transported by several pole piece conveying mechanisms. During the high-speed transmission of the pole piece (the linear speed is greater than 1.5m/s), the tabs on the outside of the pole piece are affected by other external forces such as centrifugal force and eddy current wind resistance, and are prone to folding, which in turn affects the quality of the electrode assembly and even scraps it.
  • anti-tab folding or tab smoothing devices are designed for tab folding; however, most of the existing anti-tab folding or tab smoothing devices are smoothed by guide blocks or guide wheel mechanisms, or the negative pressure suction in the roller absorbs and smoothes the pole pieces, but the light and thin tabs are very easy to collide with the guide device in the state of high-speed transmission of the pole piece. Even cause the electrode assembly to be scrapped, resulting in higher production costs.
  • the pole piece conveying mechanism includes a first conveying roller and a negative pressure providing unit.
  • the first conveying roller is used to convey the pole piece.
  • the negative pressure providing unit is arranged at at least one end of the first conveying roller.
  • the negative pressure providing unit and the first conveying roller are arranged at intervals. The air pressure around the tab is changed by the negative pressure supply unit to reduce the fold of the tab.
  • a negative pressure supply unit is provided at at least one end of the first conveying roller, and a negative pressure is formed around the tab of the pole piece through the negative pressure providing unit to reduce air resistance, thereby reducing the probability of the tab being folded.
  • the negative pressure providing unit is arranged at intervals from the first conveying roller to avoid friction with the pole lug to generate dust, ensure the quality of the product, thereby improving the utilization rate of materials and reducing production costs.
  • the battery cells used in the electrode assembly composed of pole pieces described in the embodiments of the present application may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • FIG. 1 shows a schematic structural diagram of a pole piece conveying mechanism 100 provided by some embodiments of the present application.
  • the present application provides a pole piece conveying mechanism 100 , which includes a first conveying roller 10 and a negative pressure providing unit 20 .
  • the first conveying roller 10 is used for conveying the pole piece P.
  • the negative pressure providing unit 20 is arranged on at least one end of the first conveying roller 10. Along the axial direction X of the first conveying roller 10, the negative pressure providing unit 20 is spaced apart from the first conveying roller 10.
  • the negative pressure providing unit 20 is used to form a negative pressure around the tab P2 of the pole piece P to prevent the tab P2 from turning over.
  • the direction indicated by the letter X is the axial direction of the first conveying roller 10
  • the direction indicated by the letter Y is the tape running direction of the pole piece P
  • the direction indicated by the letter Z is the thickness direction Z of the pole piece P
  • the axial direction X of the first conveying roller 10 the belt running direction Y of the pole piece P, and the thickness direction ZZ of the pole piece P are perpendicular to each other.
  • the first conveying roller 10 is a roller for conveying the pole piece P, which can carry the pole piece P, and assist the belt movement of the pole piece P.
  • the negative pressure providing unit 20 is arranged on at least one end of the first conveying roller 10. It can be that the negative pressure providing unit 20 is arranged on one end of the first conveying roller 10, or it can also be that the negative pressure providing unit 20 is arranged on opposite ends of the first conveying roller 10.
  • the pole piece P includes a main body P1 and a pole P2 protruding from the main body P1. When the pole piece P has one pole P2, the pole P2 is located on one side edge of the main body P1, and the negative pressure providing unit 20 can be arranged on the end of the first conveying roller 10 corresponding to the position of the pole P2. When the tab P2 has two tabs P2 and the tabs P2 are located on opposite side edges of the main body P1 , the negative pressure providing unit 20 may be disposed at both ends of the first conveying roller 10 to correspond to the two tabs P2 .
  • the negative pressure providing unit 20 is a component for forming a negative pressure around the tab P2 of the pole piece P.
  • the negative pressure providing unit 20 can extract air around the tab P2 along the axial direction X of the first conveying roller 10, and guide the air flow around the tab P2, so that the forces on both sides of the tab P2 in the thickness direction Z are balanced to prevent the tab P2 from turning over.
  • the central axis of the negative pressure supply unit 20 is coplanar with the conveying plane of the pole piece P.
  • the gas flow direction is perpendicular to the tape running direction Y of the pole piece P, and the center of the gas flow path is located on the conveying plane of the pole piece P. That is, when the negative pressure supply unit 20 works, the air around the tab P2 is drawn to the negative pressure supply unit 20, so that the tab P2 is in a flattened state, and the corners of the tab P2 will not be folded.
  • the negative pressure providing unit 20 is spaced apart from the first conveying roller 10 , and an area for guiding air flow is formed between the first conveying roller 10 and the negative pressure providing unit 20 , so that a negative pressure is formed around the tab P2 .
  • At least one end of the first conveyor roller 10 is set to provide a negative pressure providing unit 20 at least one end, and the negative pressure provides a negative pressure around the polar ear P2 of the polar P2 through the negative pressure to reduce the air resistance, thereby reducing the probability of the polar ear P2 folding.
  • Ear P2 friction produces dust to ensure product quality, thereby improving the utilization of materials and reducing production costs.
  • FIG. 2 shows a working principle diagram of the negative pressure providing unit 20 provided by some embodiments of the present application.
  • FIG. 3 shows a cross-sectional view of the negative pressure providing unit 20 provided by some embodiments of the present application.
  • FIG. 3 shows the airflow distribution
  • FIG. 4 is a partial enlarged view of A in FIG. 3 .
  • the negative pressure providing unit 20 is an air amplifier.
  • the air amplifier includes a drainage cavity 21, an amplification cavity 22 communicating with the drainage cavity 21, and an air inlet 23 for delivering compressed gas to the amplification cavity 22.
  • the drainage cavity 21 is close to the first delivery roller 10 relative to the amplification cavity 22.
  • the drainage cavity 21 has a suction port 24 facing the first delivery roller 10.
  • the amplification cavity 22 has an exhaust port 25 away from the first delivery roller 10, and the compressed gas It is used to establish a negative pressure so that the drainage cavity 21 introduces external air into the amplification cavity 22 through the suction port 24 .
  • the working principle of the air amplifier is based on the basic principle of fluid mechanics - the Coanda effect. Only a small amount of compressed gas is used as the power source to form a negative pressure at the intersection of the drainage chamber 21 and the amplification chamber 22, which drives the surrounding air flow, so that the drainage chamber 21 introduces the outside air into the amplification chamber 22 through the suction port 24, and forms a high-pressure, high-speed airflow at the exhaust port 25.
  • the negative pressure supply unit 20 is an air amplifier, and a small part of compressed gas is input through the air inlet 23, so that the drainage chamber 21 introduces dozens of times the external air into the amplification chamber 22 through the suction port 24 and discharges it, forming a functional area that blows on one side and sucks on the other side.
  • the air around the tab P2 can be drained to the exhaust port 25 of the amplification chamber 22, forming a local negative pressure around the tab P2, reducing air resistance, thereby reducing the probability of folding the tab P2, and improving the utilization rate of materials.
  • the negative pressure supply unit 20 is an air amplifier, which has a simple structure, occupies a small space, is only driven by compressed gas, has low energy consumption, and is safe to use.
  • the air amplifier includes a first cylinder 26 and a second cylinder 27.
  • Part of the first cylinder 26 is sleeved outside the second cylinder 27, and the inside of the second cylinder 27 forms an amplification chamber 22.
  • the part of the first cylinder 26 that is not sleeved on the second cylinder 27 forms a drainage cavity 21.
  • the air inlet 23 is arranged on the outer peripheral surface of the first cylinder 26 and runs through the first cylinder 26. The part of the first cylinder 26 is far away from the second cylinder 27.
  • An air inlet 24 is formed at one end of the second cylindrical body 27, an exhaust port 25 is formed at an end far away from the first cylindrical body 26, and an annular air flow chamber 261 is formed between the inner peripheral surface of the first cylindrical body 26 and the outer peripheral surface of the second cylindrical body 27, and the compressed gas input by the air inlet 23 enters the amplifying chamber 22 after passing through the annular air flow chamber 261.
  • Both the first cylinder 26 and the second cylinder 27 are cylindrical structures with open ends. One end of the first cylinder 26 is sheathed outside the second cylinder 27 so that part of the first cylinder 26 and part of the second cylinder 27 overlap. The opening of the end of the first cylinder 26 away from the second cylinder 27 is the suction port 24 , and the opening of the end of the second cylinder 27 away from the first cylinder 26 is the exhaust port 25 .
  • An outer peripheral surface of one end of the second cylinder 27 located in the first cylinder 26 may be formed with a concave portion, so that an annular airflow chamber 261 is formed between the outer peripheral surface of the second cylinder 27 and the inner peripheral surface of the first cylinder 26 .
  • the annular airflow chamber 261 communicates with the air inlet 23 and the amplifying chamber 22. Compressed gas enters the annular airflow chamber 261 through the air inlet 23, and flows from the annular airflow chamber 261 to the amplifying chamber 22. After the compressed gas flows out of the annular airflow chamber 261, a negative pressure area is formed in the area between the amplifying chamber 22 and the drainage chamber 21, and the gas around the suction port 24 is guided into the amplifying chamber 22 through the drainage chamber 21.
  • the first cylindrical body 26 is sheathed on the outside of the second cylindrical body 27 , which has a simple structure and is easy to assemble.
  • the first cylindrical body 26 is rotatably sleeved on the outside of the second cylindrical body 27 , the inner wall of the first cylindrical body 26 is formed with an annular boss 262 , and an annular gap 263 is formed between the end of the second cylindrical body 27 located in the first cylindrical body 26 and the annular boss 262 . 22.
  • the annular gap 263 is the gap formed between the end of the second cylinder 27 located in the first cylinder 26 and the annular boss 262 , which can be understood as the area between the end of the second cylinder 27 and the annular boss 262 in the axial direction of the first cylinder 26 .
  • the annular gap 263 is located between the amplification cavity 22 and the drainage cavity 21 .
  • the compressed gas flows out from the annular gap 263 and flows toward the amplifying chamber 22 , the area between the amplifying chamber 22 and the drainage chamber 21 forms a negative pressure environment, and the ambient air around the drainage port is guided into the drainage chamber 21 and flows toward the amplifying chamber 22 .
  • the size of the annular gap 263 can be adjusted, and then the negative pressure value in the area of the tab P2 can be adjusted, that is, the degree of smoothing of the tab P2 can be adjusted to adapt to the tabs P2 of different thicknesses and shapes, and to adapt to the first conveying roller 10 of different diameters.
  • first cylinder 26 and the second cylinder 27 are in a rotationally sealed fit.
  • the compressed gas entering the annular air flow chamber 261 through the air inlet 23 can only enter the amplifying chamber 22 through the annular gap 263 .
  • the air amplifier further includes an adjustment ring 28, the adjustment ring 28 is sleeved on the second cylinder 27 and connected with the first cylinder 26, and the adjustment ring 28 is screwed to the second cylinder 27.
  • Rotating the adjusting ring 28 can drive the first cylinder 26 to rotate relative to the second cylinder 27 , and at the same time, can change the size of the annular gap 263 , and then change the air output of the annular gap 263 , thereby adjusting the air intake of the air inlet 24 .
  • FIG. 5 shows a schematic diagram of assembly of the first bracket 31 and the second bracket 32 provided by some embodiments of the present application
  • FIG. 6 shows a schematic diagram of the assembly of the negative pressure adjustment unit 20 and the second bracket 32 provided by some embodiments of the present application
  • the pole piece conveying mechanism 100 further includes: a first bracket 31 and a second bracket 32 , the second bracket 32 is movably connected to the first bracket 31 , the first conveying roller 10 is rotatably connected to the first bracket 31 , and the negative pressure providing unit 20 is movably connected to the second bracket 32 .
  • the first bracket 31 is a component used to provide support for the first conveying roller 10 , the first conveying roller 10 is rotatably connected to the first bracket 31 , and the first conveying roller 10 can rotate relative to the first bracket 31 . Both ends of the first conveying roller 10 can be respectively connected to the first support 31 , or one end of the first conveying roller 10 can be connected to the first support 31 .
  • the first bracket 31 can be a U-shaped structure, the first bracket 31 includes a first bottom plate 311 and first side plates 312 connected to opposite ends of the first bottom plate 311, the first conveying roller 10 is located between the two first side plates 312, and the first conveying roller 10 is rotatably connected to the two first side plates 312.
  • the first side plate 312 and the first bottom plate 311 can be set separately, and connected together by connecting parts (bolts, rivets, etc.), or fixed together by welding; the first side plate 312 and the first bottom plate 311 can also be integrally formed, such as integrally formed by casting, or formed by bending a plate, which is not limited in this application.
  • the second bracket 32 is a component used to provide support for the negative pressure providing unit 20.
  • the negative pressure providing unit 20 is movably connected to the second bracket 32, and the negative pressure providing unit 20 can move relative to the second bracket 32 to change the position of the negative pressure providing unit 20 relative to the first conveying roller 10.
  • the second bracket 32 is movably connected to the first bracket 31 , and the second bracket 32 can move relative to the first bracket 31 to change the position of the negative pressure providing unit 20 relative to the first conveying roller 10 .
  • the second bracket 32 includes a second bottom plate 321 and a second side plate 322 connected to the second bottom plate 321 , the second side plate 322 is arranged parallel to the first side plate 312 , the second bottom plate 321 is connected to the first bottom plate 311 , and the negative pressure providing unit 20 is arranged on the second side plate 322 .
  • the second side plate 322 and the second bottom plate 321 form an L-shaped structure.
  • the second side plate 322 and the second bottom plate 321 can be arranged separately, and connected together by connecting parts (bolts, rivets, etc.), or fixed together by welding; the second side plate 322 and the second bottom plate 321 can also be integrally formed, such as integrally formed by casting, or formed by bending a plate, which is not limited in this application.
  • the negative pressure supply unit 20 is connected to the second support 32 through the mounting seat 34 .
  • the negative pressure providing unit 20 is fixed on the mounting base 34 , and the mounting base 34 is connected to the second side plate 322 .
  • the mounting seat 34 may be a flat plate, which is arranged parallel to the second side plate 322 .
  • the positioning and support of the first conveying roller 10 is realized by the first bracket 31 to ensure stable conveyance of the first conveying roller 10 to the pole piece P, and the positioning and support of the negative pressure providing unit 20 is realized by the second support 32, so as to form a stable negative pressure environment around the tab P2.
  • pole pieces P of different thicknesses and shapes, and first conveying rollers 10 of different roller diameters will affect the smoothing effect of the negative pressure supply unit 20 on the tab P2. It is necessary to adjust the relative position of the negative pressure supply unit 20 and the pole tab P2 according to different thicknesses and running pole pieces P and the first conveyor roller 10 of different roll diameters, so as to ensure that the negative pressure provided by the negative pressure supply unit 20 can prevent the tab P2 from turning over.
  • the following embodiments describe the manner of adjusting the position of the negative pressure supply unit 20 .
  • the second bracket 32 is provided with a first strip-shaped hole 323 extending along the thickness direction Z of the pole piece P
  • the pole piece conveying mechanism 100 also includes: a first adjustment member 411, which is connected to the negative pressure supply unit 20, and the first adjustment member 411 can be movably passed through the first strip-shaped hole 323; The pressure providing unit 20 is locked to the second bracket 32 .
  • the first strip-shaped hole 323 extends along the thickness direction Z of the pole piece P, and the first adjusting member 411 is movably inserted in the first strip-shaped hole 323.
  • the first adjusting member 411 can move relative to the second bracket 32 along the thickness direction Z of the pole piece P, thereby changing the position of the negative pressure providing unit 20 connected to the first adjusting member 411 along the thickness direction Z of the pole piece P, thereby changing the distance between the negative pressure providing unit 20 and the first conveying roller 10 in the thickness direction of the tab P2.
  • the position of the negative pressure providing unit 20 in the thickness direction Z of the pole piece P is adjusted to adapt to pole pieces P of different thicknesses and shapes, and to adapt to first conveying rollers 10 of different diameters.
  • the first strip-shaped hole 323 is arranged on the second side plate 322, the number of the first strip-shaped hole 323 is two, and the two first strip-shaped holes 323 are distributed at intervals along the tape running direction Y of the pole piece P.
  • the first adjustment member 411 can be a rod with a threaded section, and the first locking member 412 can be a nut.
  • the first adjustment member 411 has a first end and a second end oppositely arranged. The second end passes through the first strip hole 323 and is threadedly connected with the first locking member 412 , which has a simple structure and is convenient for assembly.
  • the second bracket 32 is provided with a second strip-shaped hole 324 extending along the axial direction X of the first conveying roller 10, and the pole piece conveying mechanism 100 also includes: a second adjustment member 421, the second adjustment member 421 is connected to the first bracket 31, and the second adjustment member 421 is movably passed through the second strip-shaped hole 324; 31 is locked to the second bracket 32 .
  • the second strip-shaped hole 324 extends along the axial direction X of the first conveying roller 10, and the second regulating member 421 is movably inserted in the second strip-shaped hole 324.
  • the second regulating member 421 can move relative to the second support 32 along the axial direction X of the first conveying roller 10, thereby changing the position of the first support 31 connected to the second regulating member 421 along the axial direction X of the first conveying roller 10, thereby changing the distance between the negative pressure providing unit 20 and the first conveying roller 10 in the axial direction X of the first conveying roller 10.
  • the position of the negative pressure providing unit 20 relative to the first support 31 along the axial direction X of the first conveying roller 10 is adjusted to adapt to pole pieces P of different thicknesses and shapes, and to adapt to first conveying rollers 10 of different diameters.
  • the second strip-shaped hole 324 is arranged on the second bottom plate 321, and there are two second strip-shaped holes 324, and the two second strip-shaped holes 324 are arranged at intervals along the tape running direction Y (see FIG. 1 ) of the pole piece P.
  • the second adjusting member 421 can be a rod with a threaded section
  • the second locking member 422 can be a nut.
  • the plate 311 is at least provided with a threaded section at the fourth end, and the fourth end passes through the second strip hole 324 and is threadedly connected with the second locking member 422 , the structure is simple and the assembly is convenient.
  • the pole piece P includes a main body P1 and a pole P2 protruding from the main body P1.
  • the first conveying roller 10 includes a first roller segment 11 and a second roller segment 12 sequentially connected along the axial direction thereof.
  • the first roller section 11 and the second roller section 12 are two parts of the first conveying roller 10 distributed sequentially along the axial direction X of the first conveying roller 10, the first roller section 11 and the second roller section 12 are coaxially arranged, the diameters of the first roller section 11 and the second roller section 12 are different, and a step is formed between the first roller section 11 and the second roller section 12.
  • the main body P1 is carried by the first roller segment 11 , and since the diameter of the second roller segment 12 is smaller than that of the first roller segment 11 , the tab P2 does not contact the second roller segment 12 .
  • the diameter of the second roll section 12 corresponding to the tab P2 is smaller than the diameter of the first roll section 11 corresponding to the main body P1, and the tab P2 does not contact the second roll section 12.
  • the tab P2 will not impact the roller surface of the second roll section 12 and will not damage the tab P2.
  • the diameter difference between the first roll segment 11 and the second roll segment 12 is 2-10 mm.
  • the diameter difference between the first roll segment 11 and the second roll segment 12 is 2-10 mm, and a step is formed between the first roll segment 11 and the second roll segment 12.
  • the pole piece P enters the roll it can prevent the tab P2 from impacting the roll surface of the second roll segment 12;
  • the diameter difference between the first roll segment 11 and the second roll segment 12 is small, the tab P2 is more likely to impact the roll surface of the second roll segment 12 when the pole piece P enters the roll, which may easily cause damage to the tab P2.
  • FIG. 7 shows a schematic structural diagram of a pole piece conveying mechanism 100 provided in other embodiments of the present application.
  • the pole piece conveying mechanism 100 further includes: a second conveying roller 50 disposed opposite to the first conveying roller 10 and forming a gap therebetween for the pole piece P to pass through.
  • the second conveying roller 50 is arranged opposite to the first conveying roller 10, and the second conveying roller 50 and the first conveying roller 10 are located on both sides of the thickness direction Z of the pole piece P.
  • the distance between the second conveying roller 50 and the first conveying roller 10 is adjustable, so as to facilitate the threading of the pole piece P, or the removal of the pole piece P.
  • the pole piece P is transported through the cooperation of the second conveying roller 50 and the first conveying roller 10 , so as to ensure stable conveyance of the pole piece P.
  • the pole piece conveying mechanism 100 further includes a third support 33, the third support 33 is connected to the first support 31, and the second conveying roller 50 is rotatably connected to the third support 33, so as to realize the positioning support of the second conveying roller 50.
  • the third support 33 is a U-shaped structure.
  • the third support 33 includes a top plate 331 and a third side plate 332 connected to opposite ends of the top plate 331.
  • One of the third side plates 332 is connected to the first side plate 312.
  • the second conveying roller 50 is located between the two third side plates 332.
  • the top plate 331 is located on the side of the second conveying roller 50 away from the first conveying roller 10. Plate 332 rotates.
  • the third side plate 332 and the top plate 331 can be arranged separately, and connected together by connecting parts (bolts, rivets, etc.), or fixed together by welding; the third side plate 332 and the top plate 331 can also be integrally formed, such as integrally formed by casting, or formed by bending a plate, which is not limited in the present application.
  • the size of the third side plate 332 connected to the first side plate 312 is greater than the size of the other third side plate 332, for example, the length, width and thickness of the third side plate 332 connected to the first side plate 312 are larger than the size of the other third side plate 332, so as to facilitate the connection strength between the third side plate 332 and the first side plate 312.
  • the central axis of the negative pressure providing unit 20 is parallel to the central axis of the first conveying roller 10 and located between the first conveying roller 10 and the second conveying roller 50 .
  • the central axis of the negative pressure supply unit 20 refers to the central axis of the flow path of the airflow when the negative pressure supply unit 20 provides negative pressure, and may also be the central axis of the suction port 24 of the negative pressure supply unit 20 .
  • the central axis of the negative pressure providing unit 20 is located between the first conveying roller 10 and the second conveying roller 50, and the distance from the central axis of the negative pressure providing unit 20 to the central axis of the first conveying roller 10 can be the same as the distance to the central axis of the second conveying roller 50, or the distance from the central axis of the negative pressure providing unit 20 to the central axis of the first conveying roller 10 can be smaller than the distance from the central axis of the negative pressure providing unit 20 to the central axis of the second conveying roller 50, or it can also be the central axis of the negative pressure providing unit 20
  • the distance to the central axis of the first conveying roller 10 is greater than the central axis of the negative pressure supply unit
  • the central axis of the negative pressure supply unit 20 is located between the first conveying roller 10 and the second conveying roller 50, so as to ensure that the force on both sides in the thickness direction of the tab P2 is balanced and prevent the tab P2 from being folded.
  • the length of the second conveying roller 50 is shorter than that of the first conveying roller 10 , and the projection of the second conveying roller 50 on the pole piece P coincides with the first roller segment 11 .
  • the length of the second conveying roller 50 is shorter than the length of the first conveying roller 10, and the projection of the second conveying roller 50 on the first conveying roller 10 coincides with the first roller section 11, so that the second conveying roller 50 cooperates with the first conveying roller 10 to ensure stable conveyance of the pole piece P, and the second conveying roller 50 does not contact the pole piece P2, so as to prevent the pole ear P2 from scraping the roller surface of the second conveying roller 50 and damage the pole piece P2.
  • the second conveying roller 50 includes a third roller section 51 corresponding to the first roller section 11 and a fourth roller section 52 corresponding to the second roller section 12, the fourth roller section 52 is connected to the third roller section 51, the diameter of the fourth roller section 52 is smaller than the diameter of the third roller section 51, the third roller section 51 is used for conveying the main body part P1, and the fourth roller section 52 is used for corresponding to the tab P2.
  • the structure of the second conveying roller 50 is the same as that of the first conveying roller 10.
  • the space formed between the fourth roller section 52 and the second roller section 12 is used to accommodate the tab P2, and the tab P2 is not in contact with the second roller section 12 and the fourth roller section 52.
  • the second roller section 12 and the fourth roller section 52 can support the tab P2 and prevent the tab P2 from turning over.
  • At least one of the first conveying roller 10 and the second conveying roller 50 is a driven roller.
  • first conveying roller 10 and the second conveying roller 50 can be a driven roller, and the other is a driving roller with a power-driven structure.
  • first conveying roller 10 can be a driven roller
  • second conveying roller 50 can be a driving roller.
  • Both the first conveying roller 10 and the second conveying roller 50 may be driven rollers, and both the first conveying roller 10 and the second conveying roller 50 are driven by the pole piece P to rotate.
  • At least one of the first conveying roller 10 and the second conveying roller 50 is a driven roller, so as to facilitate the conveyance of the pole piece P.
  • first conveying roller 10 and the second conveying roller 50 can also be driving rollers, but it is necessary to ensure that the first conveying roller 10 and the second conveying roller 50 have the same diameter and rotational speed, so as to avoid wrinkling of the pole piece P.
  • the present application also provides a pole piece forming device, which includes an unwinding mechanism, a winding mechanism, and the pole piece conveying mechanism 100 provided in any of the foregoing embodiments.
  • the unwinding mechanism is used for unwinding the pole piece P
  • the winding mechanism is used for winding the pole piece P
  • the pole piece conveying mechanism 100 is arranged between the unwinding mechanism and the winding mechanism.
  • the number of the pole piece conveying mechanism 100 can be multiple, so as to ensure the stable transportation of the pole piece P, ensure the conveying quality of the pole piece P, and prevent the tab P2 from turning over.
  • the present application provides a pole piece conveying mechanism 100 , which includes a first conveying roller 10 , a negative pressure providing unit 20 , a first support 31 and a second support 32 .
  • the first conveying roller 10 is used for conveying the pole piece P, and the pole piece P includes a main body P1 and a pole ear P2 protruding from the main body P1 .
  • the first conveying roller 10 includes a first roller section 11 and a second roller section 12, the diameter of the first roller section 11 is greater than the diameter of the second roller section 12, the first roller section 11 is used to convey the main body part P1, the second roller section 12 is used to correspond to the tab P2, and the tab P2 is not in contact with the second roller section 12.
  • the negative pressure supply unit 20 is an air amplifier.
  • the air amplifier is arranged at one end of the first conveying roller 10 corresponding to the tab P2. Along the axial direction X of the first conveying roller 10 , the air amplifier is spaced apart from the first conveying roller 10 .
  • the first conveying roller 10 is rotatably connected to the first bracket 31
  • the air amplifier is movably connected to the second bracket 32
  • the second bracket 32 is movably connected to the first bracket 31 .
  • the air amplifier can move relative to the second bracket 32 along the thickness direction Z of the pole piece P to change the distance between the air amplifier and the tab P2 in the thickness direction of the tab P2.
  • the second bracket 32 can move relative to the first bracket 31 along the axial direction X of the first conveying roller 10 to change the distance between the air amplifier and the tab P2 in the axial direction X of the first conveying roller 10 .
  • an air amplifier is installed at the end of the first conveying roller 10 corresponding to the tab P2.
  • a negative pressure is formed around the tab P2 of the pole piece P to reduce air resistance, thereby reducing the probability of the tab P2 being folded.
  • the negative pressure supply unit 20 is spaced apart from the first conveying roller 10 to avoid friction with the tab P2 to generate dust, ensure product quality, improve material utilization, and reduce production. Cost; at the same time, the negative pressure providing unit 20 is an air amplifier, which has a simple structure, occupies a small space, is only driven by compressed gas, has low energy consumption, and is safe to use.

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Abstract

本申请实施例提供一种极片输送机构及极片成型系统。该极片输送机构包括：第一输送辊，用于输送极片；以及负压提供单元，设置在所述第一输送辊的至少一端，沿所述第一输送辊的轴向，所述负压提供单元与所述第一输送辊间隔设置，所述负压提供单元用于在所述极片的极耳周围形成负压，以阻止所述极耳翻折。本申请实施例的方案，能够提高材料的利用率，降低生产成本。

Description

极片输送机构及极片成型系统 技术领域
本申请涉及电池技术领域，特别是涉及一种极片输送机构及极片成型系统。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。电池包括电极组件，电极组件可以为正极极片和负极极片卷绕而成。
在电池技术的发展中，除了提高电池的性能外，生产成本也是一个不可忽视的问题。因此，如何降低生产成本，是电池技术中一个亟待解决的技术问题。
发明内容
本申请的目的在于提供一种极片输送机构及极片成型系统，能够提高材料的利用率，降低生产成本。
本申请是通过如下技术方案实现的：
第一方面，本申请提供了一种极片输送机构，包括：第一输送辊，用于输送极片；以及负压提供单元，设置在所述第一输送辊的至少一端，沿所述第一输送辊的轴向，所述负压提供单元与所述第一输送辊间隔设置，所述负压提供单元用于在所述极片的极耳周围形成负压，以阻止所述极耳翻折。
根据本申请实施例的极片输送机构，在第一输送辊的至少一端设置负压提供单元，通过负压提供单元在极片的极耳周围形成负压，减少空气阻力，进而减少极耳翻折的概率，另外，沿第一输送辊的轴向，负压提供单元与第一输送辊间隔设置，避免与极耳发生摩擦产生粉尘，保证产品质量，从而提高材料的利用率，降低生产成本。
根据本申请的一些实施例，所述负压提供单元为空气放大器，所述空气放大器包括引流腔、与所述引流腔连通的放大腔以及用于向所述放大腔输送压缩气体的进气口，所述引流腔相对于所述放大腔靠近所述第一输送辊，所述引流腔具有面向所述第一输送辊的吸气口，所述放大腔具有背离所述第一输送辊的排气口，所述压缩气体用于建立负压以使所述引流腔通过所述吸气口将外界气体引入所述放大腔。
在上述方案中，负压提供单元为空气放大器，通过进气口输入小部分压缩气体，使得引流腔通过吸气口将数十倍的外界气体引入放大腔排出，形成一侧吹、另一侧吸的功能区，利用空气放大器的特性，可将极耳周围的空气引流至放大腔的排气口，在极耳周围形成局部负压，减少空气阻力，进而减少极耳翻折的概率，提高材料的利用率。空气放大器，结构简单，空间占地小，仅靠压缩气体驱动，能耗小，使用安全。
根据本申请的一些实施例，所述空气放大器包括第一筒体和第二筒体，部分所 述第一筒体套设于所述第二筒体的外部，所述第二筒体的内部形成所述放大腔，所述第一筒体的未套设于所述第二筒体的部分形成所述引流腔，所述进气口设置于所述第一筒体的外周面且贯穿所述第一筒体，所述第一筒体的远离所述第二筒体的一端形成所述吸气口，所述第二筒体的远离所述第一筒体的一端形成所述排气口，所述第一筒体的内周面与所述第二筒体的外周面之间形成环形气流室，所述进气口输入的所述压缩气体经由所述环形气流室后进入所述放大腔。
在上述方案中，第一筒体套设于第二筒体的外部，结构简单，便于装配。
根据本申请的一些实施例，所述第一筒体可转动地套设于所述第二筒体的外部，所述第一筒体的内壁形成有环形凸台，所述第二筒体的位于所述第一筒体内的端部与所述环形凸台之间形成有环形缝隙，所述环形缝隙与所述环形气流室连通，所述环形气流室内的所述压缩气体经由所述环形缝隙进入所述放大腔。
在上述方案中，通过转动第一筒体，改变第一筒体和第二筒体在第一筒体的轴向上的装配长度，能够调整环形缝隙的大小，进而调整极耳区域的负压值，也即调整对极耳的抚平力度，适应不同厚度和形状的极耳，适应不同直径的第一输送辊。
根据本申请的一些实施例，所述极片输送机构还包括：第一支架和第二支架，所述第二支架可活动地连接于所述第一支架，所述第一输送辊可转动地连接于所述第一支架，所述负压提供单元可活动地连接于所述第二支架。
在上述方案中，通过第一支架实现对第一输送辊的定位支撑，保证第一输送辊对极片的输送平稳，通过第二支架实现负压提供单元的定位支撑，以便于对极耳周围形成稳定的负压环境。
根据本申请的一些实施例，所述第二支架设置有沿所述极片的厚度方向延伸的第一条形孔，所述极片输送机构还包括：第一调节件，所述第一调节件连接于所述负压提供单元，所述第一调节件可活动地穿设于所述第一条形孔；第一锁紧件，所述第一锁紧件用于与所述第一调节件连接，以将所述负压提供单元锁定于所述第二支架。
在上述方案中，通过改变第一调节件在第一条形孔内的位置，调节负压提供单元在极片的厚度方向上的位置，以适应不同厚度和形状的极片，适应不同直径的第一输送辊。
根据本申请的一些实施例，所述第二支架设置有沿所述第一输送辊的轴向延伸的第二条形孔，所述极片输送机构还包括：第二调节件，所述第二调节件连接于所述第一支架，所述第二调节件可活动地穿设于所述第二条形孔；第二锁紧件，所述第二锁紧件用于与所述第二调节件连接，以将所述第一支架锁定于所述第二支架。
在上述方案中，通过改变第二调节件在第二条形孔的位置，调节负压提供单元沿第一输送辊的轴向相对于第一支架的位置，以适应不同厚度和形状的极片，适应不同直径的第一输送辊。
根据本申请的一些实施例，所述极片包括主体部和凸出于所述主体部的极耳，所述第一输送辊包括沿其轴向依次连接的第一辊段和第二辊段，所述第一辊段的直径大于所述第二辊段的直径，所述第一辊段用于输送所述主体部，所述第二辊段用于与所述极耳对应。
在上述方案中，与极耳对应的第二辊段的直径小于与主体部对应的第一辊段的直径，极耳不与第二辊段接触，在极片入辊时，极耳不会冲击第二辊段的辊面，不会损伤极耳，极耳经过第一输送辊时，极耳不会与第二辊段的辊面刮擦，不会产生粉尘，提高了极片构成的电极组件的质量。
根据本申请的一些实施例，所述第一辊段与所述第二辊段的直径差为2-10mm。
在上述方案中，第一辊段与第二辊段的直径差为2-10mm，第一辊段和第二辊段之间形成台阶，一方面，在极片入辊时，能够防止极耳冲击第二辊段的辊面；另一方面，在极耳处气流过大时，第二辊段能够对极耳起到支撑作用，防止极耳朝向第二辊段的辊面翻折。
根据本申请的一些实施例，所述极片输送机构还包括：第二输送辊，与所述第一输送辊相对设置且两者之间形成供所述极片穿过的间隙。
在上述方案中，通过第二输送辊与第一输送辊配合对极片进行输送，保证极片输送稳定。
根据本申请的一些实施例，所述负压提供单元的中心轴线与所述第一输送辊的中心轴线平行，且位于所述第一输送辊和所述第二输送辊之间。
在上述方案中，负压提供单元的中心轴线位于第一输送辊和第二输送辊之间，以便于保证极耳厚度方向的两侧受力均衡，防止极耳翻折。
根据本申请的一些实施例，所述第二输送辊的长度小于所述第一输送辊的长度，所述第二输送辊在所述极片上的投影与所述第一辊段重合。
在上述方案中，第二输送辊的长度小于第一输送辊的长度，并且第二输送辊在第一输送辊上的投影与第一辊段重合，以使第二输送辊与第一输送辊配合保证极片输送稳定，并且第二输送辊不与极耳接触，避免极耳刮擦第二输送辊的辊面，避免损伤极耳。
根据本申请的一些实施例，所述第二输送辊包括与所述第一辊段对应的第三辊段和与所述第二辊段对应的第四辊段，所述第四辊段连接于所述第三辊段，所述第四辊段的直径小于所述第三辊段的直径，所述第三辊段用于输送所述主体部，所述第四辊段用于与所述极耳对应。
在上述方案中，第二输送辊的结构与第一输送辊的结构形式相同，第四辊段与第二辊段之间形成的空间用于容纳极耳，并且极耳不与第二辊段和第四辊段接触，但是，当极耳处气流过大时，第二辊段和第四辊段能够对极耳起到支撑作用，防止极耳翻折。
根据本申请的一些实施例，所述第一输送辊和所述第二输送辊中至少一者为从动辊。
在上述方案中，第一输送辊和第二输送辊中至少一者为从动辊，便于实现对极片的输送。
第二方面，本申请提供了一种极片输送设备，其包括：放卷机构，用于放卷极片；收卷机构，用于收卷所述极片；如上述任一方案所述的极片输送机构，所述输送机构设置于所述放卷机构与所述收卷机构之间。
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
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请一些实施例提供的极片输送机构的结构示意图；
图2为本申请一些实施例提供的负压提供单元的工作原理图；
图3为本申请一些实施例提供的负压提供单元的剖视图；
图4为图3的A处局部放大图；
图5为本申请一些实施例提供的第一支架与第二支架的装配示意图；
图6为本申请一些实施例提供的负压调节单元与第二支架的装配示意图；
图7为本申请另一些实施例提供的极片输送机构的结构示意图；
图8为本申请一些实施例提供的第二输送辊与第一输送辊的配合示意图；
在附图中，附图并未按照实际的比例绘制。
标记说明：100-极片输送机构；10-第一输送辊；11-第一辊段；12-第二辊段；20-负压提供单元；21-引流腔；22-放大腔；23-进气口；24-吸气口；25-排气口；26-第一筒体；261-环形气流室；262-环形凸台；263-环形缝隙；264-倒圆角；27-第二筒体；28-调节环；31-第一支架；311-第一底板；312-第一侧板；32-第二支架；321-第二底板；322-第二侧板；323-第一条形孔；324-第二条形孔；33-第三支架；331-顶板；332-第三侧板；34-安装座；411-第一调节件；412-第一锁紧件；421-第二调节件；422-第二锁紧件；50-第二输送辊；51-第三辊段；52-第四辊段；P-极片；P1-主体部；P2-极耳。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
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；本文中在申请的说明书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，意图在于覆盖不排它的包含。
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。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请的描述中，需要理解的是，术语“中心”、“长度”、“宽度”、“厚度”、“底”、“内”、“外”、“周向”等指示的方位或者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的限制。此外，本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序，可以明示或者隐含地包括一个或者更多个该特征。在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；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。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件由正极极片、负极极片和隔膜组成。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的集流体凸出于已涂覆正极活性物质层的集流体，未涂敷正极活性物质层的集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的集流体凸出于已涂覆负极活性物质层的集流体，未涂敷负极活性物质层的集流体作为负 极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
卷绕式的电极组件包括层叠卷绕设置的正极极片和负极极片，隔膜设置于正极极片和负极极片之间，以绝缘隔离正极极片和负极极片。正极极片和负极极片为卷材，在电极组件卷绕成型的过程中，正极极片和负极极片均需要输送至卷绕设备。极片包括主体部和凸出于主体部的极耳。
电极组件在卷绕成型前，极片需要经过较长距离的输送，输送过程中需要经过若干极片输送机构的传输，在极片高速(线速度大于1.5m/s)传输过程中，极片外侧的极耳受到离心力及涡流风阻等其他外力影响，极易产生翻折，继而影响电极组件质量乃至报废。
虽然现有技术中，针对极耳的翻折，设计有防极耳翻折或极耳抚平装置；但是，现有的防极耳翻折或极耳抚平装置大多是通过导向块或导向轮机构进行抚平，或通过辊内负压吸力对极片吸附抚平，但是轻而薄的极耳在极片高速传输的状态下极易与导向装置碰撞导致极耳开裂受损，或与导向块相互摩擦产生粉尘，粉尘粘附于极片的表面，影响电极组件质量，甚至造成电极组件报废，导致生产成本较高。
鉴于此，为了解决电极组件生产成本较高的问题，发明人经过深入研究，设计了一种极片输送机构，该极片输送机构包括第一输送辊以及负压提供单元，第一输送辊用于输送极片，负压提供单元设置在所述第一输送辊的至少一端，沿第一输送辊的轴向，负压提供单元与第一输送辊间隔设置，负压提供单元用于在极片的极耳周围形成负压，以阻止极耳翻折。通过负压提供单元改变极耳周围的空气压力，来减少极耳翻折。
采用本申请实施例提供的极片输送机构，在第一输送辊的至少一端设置负压提供单元，通过负压提供单元在极片的极耳周围形成负压，减少空气阻力，进而减少极耳翻折的概率，另外，沿第一输送辊的轴向，负压提供单元与第一输送辊间隔设置，避免与极耳发生摩擦产生粉尘，保证产品的质量，从而提高材料的利用率，降低生产成本。
本申请的实施例描述的极片构成的电极组件所使用的电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。
根据本申请的一些实施例，请参照图1，图1示出了本申请一些实施例提供的极片输送机构100的结构示意图。如图1所示，本申请提供了一种极片输送机构100，其包括第一输送辊10以及负压提供单元20。第一输送辊10用于输送极片P。负压提供单元20设置在第一输送辊10的至少一端，沿第一输送辊10的轴向X，负压提供单元20与第一输送辊10间隔设置，负压提供单元20用于在极片P的极耳P2周围形成负压，以阻止极耳P2翻折。
图中，字母X所指示的方向为第一输送辊10的轴向，字母Y所指示的方向为 极片P的走带方向，字母Z所指示的方向为极片P的厚度方向Z，第一输送辊10的轴向X、极片P的走带方向Y以及极片P的厚度方向ZZ两两垂直。
第一输送辊10为用于输送极片P的辊，其能够承载极片P，辅助极片P的走带。
负压提供单元20设置在第一输送辊10的至少一端，可以为，负压提供单元20设置在第一输送辊10的一端，或者，也可以为，负压提供单元20设置在第一输送辊10的相对的两端。极片P包括主体部P1和凸出于主体部P1的极耳P2，极片P具有一个极耳P2时，极耳P2位于主体部P1的一侧边缘，负压提供单元20可以设置在第一输送辊10的与极耳P2位置对应的一端。极耳P2具有两个极耳P2、且极耳P2位于主体部P1的相对的两侧边缘时，负压提供单元20可以设置在第一输送辊10的两端，以与两个极耳P2对应。
负压提供单元20为用于在极片P的极耳P2周围形成负压的部件，例如，负压提供单元20可以沿第一输送辊10的轴向X抽取极耳P2周围的空气，引导极耳P2周围的空气流动，使得极耳P2的厚度方向Z两侧受力均衡，以阻止极耳P2翻折，换句话说，负压提供单元20能够通过在极耳P2的周围制造负压，通过气流抚平极耳P2。需要指出的是，负压提供单元20的中心轴线与极片P的输送平面共面，换句话说，负压提供单元20提供负压时，气体的流动方向与极片P的走带方向Y垂直，并且气体的流动路径的中心位于极片P的输送平面，也即，负压提供单元20工作时，极耳P2周围的空气被抽向负压提供单元20，使得极耳P2处于展平的状态，极耳P2的边角不会翻折。
负压提供单元20与第一输送辊10间隔设置，在第一输送辊10与负压提供单元20之间形成便于引导空气流动的区域，以使极耳P2周围形成负压。
根据本申请实施例的极片输送机构100，在第一输送辊10的至少一端设置负压提供单元20，通过负压提供单元20在极片P的极耳P2周围形成负压，减少空气阻力，进而减少极耳P2翻折的概率，另外，沿第一输送辊10的轴向X，负压提供单元20与第一输送辊10间隔设置，避免与极耳P2发生摩擦产生粉尘，保证产品质量，从而提高材料的利用率，降低生产成本。
请参照图2至图4，图2示出了本申请一些实施例提供的负压提供单元20的工作原理图，图3示出了本申请一些实施例提供的负压提供单元20的剖视图，图3中示出了气流分布情况，图4为图3的A处局部放大图。根据本申请的一些实施例，可选地，如图2至图4所示，负压提供单元20为空气放大器，空气放大器包括引流腔21、与引流腔21连通的放大腔22以及用于向放大腔22输送压缩气体的进气口23，引流腔21相对于放大腔22靠近第一输送辊10，引流腔21具有面向第一输送辊10的吸气口24，放大腔22具有背离第一输送辊10的排气口25，压缩气体用于建立负压以使引流腔21通过吸气口24将外界气体引入放大腔22。
空气放大器的工作原理为根据流体力学的基本原理-附壁效应，只用少量压缩气体作为动力源，在引流腔21与放大腔22交汇处形成负压，带动周围空气流动，以使引流腔21通过吸气口24将外界气体引入放大腔22，在排气口25形成高压、高速气流，空气放大器的排气口25的流量可以为进气口23输入的压缩气体的数十倍。
负压提供单元20为空气放大器，通过进气口23输入小部分压缩气体，使得引流腔21通过吸气口24将数十倍的外界气体引入放大腔22排出，形成一侧吹、另一侧吸的功能区，利用空气放大器的特性，可将极耳P2周围的空气引流至放大腔22的排气口25，在极耳P2周围形成局部负压，减少空气阻力，进而减少极耳P2翻折的概率，提高材料的利用率。负压提供单元20为空气放大器，结构简单，空间占地小，仅靠压缩气体驱动，能耗小，使用安全。
根据本申请的一些实施例，可选地，如图2至图4所示，空气放大器包括第一筒体26和第二筒体27，部分第一筒体26套设于第二筒体27的外部，第二筒体27的内部形成放大腔22，第一筒体26的未套设于第二筒体27的部分形成引流腔21，进气口23设置于第一筒体26的外周面且贯穿第一筒体26，第一筒体26的远离第二筒体27的一端形成吸气口24，第二筒体27的远离第一筒体26的一端形成排气口25，第一筒体26的内周面与第二筒体27的外周面之间形成环形气流室261，进气口23输入的压缩气体经由环形气流室261后进入放大腔22。
第一筒体26和第二筒体27均为两端开口的筒状结构，第一筒体26的一端套设于与第二筒体27的外部，使得部分第一筒体26与部分第二筒体27重叠。第一筒体26的远离第二筒体27的一端的开口为吸气口24，第二筒体27的远离第一筒体26的一端的开口为排气口25。
第二筒体27的位于第一筒体26内的一端的外周面可以形成有凹陷部，以使第二筒体27的外周面与第一筒体26的内周面之间形成环形气流室261。环形气流室261连通进气口23和放大腔22，压缩气体经由进气口23进入环形气流室261，并从环形气流室261流向放大腔22，压缩气体在从环形气流室261流出后，在放大腔22与引流腔21之间的区域形成负压区域，引导吸气口24周围的气体经由引流腔21进入放大腔22内。
第一筒体26套设于第二筒体27的外部，结构简单，便于装配。
根据本申请的一些实施例，可选地，如图2至图4所示，第一筒体26可转动地套设于第二筒体27的外部，第一筒体26的内壁形成有环形凸台262，第二筒体27的位于第一筒体26内的端部与环形凸台262之间形成有环形缝隙263，环形缝隙263与环形气流室261连通，环形气流室261内的压缩气体经由环形缝隙263进入放大腔22。
环形缝隙263为第二筒体27的位于第一筒体26内的端部与环形凸台262之间形成的缝隙，可以理解为，在沿第一筒体26的轴向，第二筒体27的端部与环形凸台262之间的区域。环形缝隙263位于放大腔22和引流腔21之间。
压缩气体从环形缝隙263流出后朝向放大腔22流动，放大腔22与引流腔21之间的区域形成负压环境，引流口周围的外界气体被引导进入引流腔21并朝向放大腔22流动。
通过转动第一筒体26，改变第一筒体26和第二筒体27在第一筒体26的轴向上的装配长度，能够调整环形缝隙263的大小，进而调整极耳P2区域的负压值，也即调整对极耳P2的抚平力度，适应不同厚度和形状的极耳P2，适应不同直径的第一输 送辊10。
需要指出的是，第一筒体26与第二筒体27为转动密封配合，换句话说，进气口23进入环形气流室261的压缩气体只能从环形缝隙263进入放大腔22。
可选地，第二筒体27位于第一筒体26内的一端的端面与内表面之间具有倒圆角264，以便于从环形缝隙263流出的气体朝向放大腔22内流动。
根据本申请的一些实施例，可选地，如图2和图3所示，空气放大器还包括调节环28，调节环28套设于第二筒体27且与第一筒体26连接，调节环28与第二筒体27螺纹连接。
转动调节环28能够驱动第一筒体26相对于第二筒体27转动，同时，能够改变环形缝隙263的大小，进而改变环形缝隙263的出气量，从而调整吸气口24的进气量。
请参照图5和图6，图5示出了本申请一些实施例提供的第一支架31与第二支架32的装配示意图，图6示出了本申请一些实施例提供的负压调节单元20与第二支架32的装配示意图。根据本申请的一些实施例，可选地，如图1、图5和图6所示，极片输送机构100还包括：第一支架31和第二支架32，第二支架32可活动地连接于第一支架31，第一输送辊10可转动地连接于第一支架31，负压提供单元20可活动地连接于第二支架32。
第一支架31为用于为第一输送辊10提供支撑的部件，第一输送辊10可转动地连接于第一支架31，第一输送辊10能够相对于第一支架31转动。第一输送辊10的两端可以分别连接于第一支架31，或者，第一输送辊10的一端连接于第一支架31。
可选地，如图1和图5所示，第一支架31可以为U字形结构，第一支架31包括第一底板311和连接于第一底板311的相对的两端的第一侧板312，第一输送辊10位于两个第一侧板312之间，第一输送辊10与两个第一侧板312可转动地连接。第一侧板312与第一底板311可以为分体设置，并通过连接件(螺栓、铆钉等)连接于一体，或者通过焊接固定于一体；第一侧板312与第一底板311也可以一体成型，例如铸造一体成型，或者板材折弯成型，本申请对此不作限定。
第二支架32为用于为负压提供单元20提供支撑的部件，负压提供单元20可活动地连接于第二支架32，负压提供单元20能够相对于第二支架32移动，以改变负压提供单元20相对于第一输送辊10的位置。第二支架32可活动地连接于第一支架31，第二支架32能够相对于第一支架31移动，以改变负压提供单元20相对于第一输送辊10的位置。
可选地，如图1、图5和图6所示，第二支架32包括第二底板321和连接于第二底板321的第二侧板322，第二侧板322与第一侧板312平行设置，第二底板321连接于第一底板311，负压提供单元20设置于第二侧板322。第二侧板322与第二底板321构成L字形结构。第二侧板322与第二底板321可以分体设置，并通过连接件(螺栓、铆钉等)连接于一体，或者通过焊接固定于一体；第二侧板322与第二底板321也可以一体成型，例如铸造一体成型，或者板材折弯成型，本申请对此不作限定。
为了便于实现负压提供单元20与第二支架32的连接，负压提供单元20通过 安装座34连接于第二支架32。如图所示，负压提供单元20固定于安装座34，安装座34与第二侧板322连接。
为了减少空间占用，安装座34可以为平板，该平板与第二侧板322平行设置。
通过第一支架31实现对第一输送辊10的定位支撑，保证第一输送辊10对极片P的输送平稳，通过第二支架32实现负压提供单元20的定位支撑，以便于对极耳P2周围形成稳定的负压环境。
在电极组件的制造过程中，不同厚度和形状的极片P、不同辊径的第一输送辊10都会影响负压提供单元20对极耳P2的抚平效果，需要根据不同厚度和行走的极片P、不同辊径的第一输送辊10来调整负压提供单元20与极耳P2的相对位置，以保证负压提供单元20提供的负压，能够阻止极耳P2翻折。以下实施例描述了负压提供单元20的位置调整方式。
根据本申请的一些实施例，可选地，如图1和图6所示，第二支架32设置有沿极片P的厚度方向Z延伸的第一条形孔323，极片输送机构100还包括：第一调节件411，第一调节件411连接于负压提供单元20，第一调节件411可活动地穿设于第一条形孔323；第一锁紧件412，第一锁紧件412用于与第一调节件411连接，以将负压提供单元20锁定于第二支架32。
第一条形孔323沿极片P的厚度方向Z延伸，第一调节件411可活动地穿设于第一条形孔323，第一调节件411能够相对于第二支架32沿极片P的厚度方向Z移动，从而改变连接于第一调节件411的负压提供单元20沿极片P的厚度方向Z上的位置，进而改变负压提供单元20与第一输送辊10在极耳P2的厚度方向上的距离。
通过改变第一调节件411在第一条形孔323内的位置，调节负压提供单元20在极片P的厚度方向Z上的位置，以适应不同厚度和形状的极片P，适应不同直径的第一输送辊10。
根据本申请的一些实施例，可选地，如图6所示，第一条形孔323设置于第二侧板322，第一条形孔323的数量为两个，两个第一条形孔323沿极片P的走带方向Y间隔分布，第一调节件411可以为具有螺纹段的杆件，第一锁紧件412可以为螺母，第一调节件411具有相对设置的第一端和第二端，第一端固定于安装座34，螺纹段至少设置于第二端，第二端穿过第一条形孔323后与第一锁紧件412螺纹连接，结构简单，装配便捷。
根据本申请的一些实施例，可选地，如图5和图6所示，第二支架32设置有沿第一输送辊10的轴向X延伸的第二条形孔324，极片输送机构100还包括：第二调节件421，第二调节件421连接于第一支架31，第二调节件421可活动地穿设于第二条形孔324；第二锁紧件422，第二锁紧件422用于与第二调节件421连接，以将第一支架31锁定于第二支架32。
第二条形孔324沿第一输送辊10的轴向X延伸，第二调节件421可活动地穿设于第二条形孔324，第二调节件421能够相对于第二支架32沿第一输送辊10的轴向X移动，从而改变连接于第二调节件421的第一支架31沿第一输送辊10的轴向X上的位置，进而改变负压提供单元20与第一输送辊10在第一输送辊10的轴向X上的距离。
通过改变第二调节件421在第二条形孔324的位置，调节负压提供单元20沿第一输送辊10的轴向X相对于第一支架31的位置，以适应不同厚度和形状的极片P，适应不同直径的第一输送辊10。
根据本申请的一些实施例，可选地，如图6所示，第二条形孔324设置于第二底板321，并且第二条形孔324设置有两个，两个第二条形孔324沿极片P的走带方向Y(请参见图1)间隔设置，第二调节件421可以为具有螺纹段的杆件，第二锁紧件422可以为螺母，第二调节件421具有相对设置的第三端和第四端，第三端固定于第一支架31的第一底板311，螺纹段至少设置于第四端，第四端穿过第二条形孔324后与第二锁紧件422螺纹连接，结构简单，装配便捷。
根据本申请的一些实施例，可选地，如图1所示，极片P包括主体部P1和凸出于主体部P1的极耳P2，第一输送辊10包括沿其轴向依次连接的第一辊段11和第二辊段12，第一辊段11的直径大于第二辊段12的直径，第一辊段11用于输送主体部P1，第二辊段12用于与极耳P2对应。
第一辊段11和第二辊段12为第一输送辊10的沿第一输送辊10的轴向X依次分布的两个部分，第一辊段11与第二辊段12同轴设置，第一辊段11和第二辊段12的直径不同，第一辊段11与第二辊段12之间形成台阶。
当极片P输送至第一输送辊10时，主体部P1被第一辊段11承载，由于第二辊段12的直径小于第一辊段11的直径，极耳P2与第二辊段12不接触。
与极耳P2对应的第二辊段12的直径小于与主体部P1对应的第一辊段11的直径，极耳P2不与第二辊段12接触，在极片P入辊时，极耳P2不会冲击第二辊段12的辊面，不会损伤极耳P2，极耳P2经过第一输送辊10时，极耳P2不会与第二辊段12的辊面刮擦，不会产生粉尘，提高了极片P构成的电极组件的质量。
根据本申请的一些实施例，可选地，第一辊段11与第二辊段12的直径差为2-10mm。
第一辊段11与第二辊段12的直径差为2-10mm，第一辊段11和第二辊段12之间形成台阶，一方面，在极片P入辊时，能够防止极耳P2冲击第二辊段12的辊面；另一方面，在极耳P2处气流过大时，第二辊段12能够对极耳P2起到支撑作用，防止极耳P2朝向第二辊段12的辊面翻折。当第一辊段11与第二辊段12的直径差较小时，在极片P入辊时，极耳P2更容易冲击第二辊段12的辊面，容易导致极耳P2损伤。当第一辊段11与第二辊段12的直径差较大时，在极耳P2处气流过大时，由于极耳P2与第二辊段12的距离较大，极耳P2由于得不到第二辊段12的支撑而更容易朝向第二辊段12的辊面翻折。
请参照图7，图7示出了本申请另一些实施例提供的极片输送机构100的结构示意图。根据本申请的一些实施例，可选地，如图7所示，极片输送机构100还包括：第二输送辊50，与第一输送辊10相对设置且两者之间形成供极片P穿过的间隙。
第二输送辊50与第一输送辊10相对设置，第二输送辊50与第一输送辊10位于极片P的厚度方向Z的两侧，换句话说，第二输送辊50与第一输送辊10平行设置，第二输送辊50与第一输送辊10之间具有间隙，以供极片P穿过。可选地，第二 输送辊50与第一输送辊10之间的间距可调，以便于极片P的穿带，或者极片P的取出。
通过第二输送辊50与第一输送辊10配合对极片P进行输送，保证极片P输送稳定。
可选地，如图7所示，极片输送机构100还包括第三支架33，第三支架33连接于第一支架31，第二输送辊50可转动地连接于第三支架33，以便于实现第二输送辊50的定位支撑。第三支架33为U字形结构，第三支架33包括顶板331和连接于顶板331的相对两端的第三侧板332，其中一个第三侧板332与第一侧板312连接，第二输送辊50位于两个第三侧板332之间，顶板331位于第二输送辊50的远离第一输送辊10的一侧，第二输送辊50与两个第三侧板332可转动地连接，以使第二输送辊50能够相对于两个第三侧板332转动。第三侧板332与顶板331可以分体设置，并通过连接件(螺栓、铆钉等)连接于一体，或者通过焊接固定于一体；第三侧板332与顶板331也可以一体成型，例如铸造一体成型，或者板材折弯成型，本申请对此不作限定。
需要指出的是，与第一侧板312连接的第三侧板332的尺寸大于另一个第三侧板332的尺寸，例如，与第一侧板312连接的第三侧板332的长度、宽度及厚度尺寸均大于另一个第三侧板332的尺寸，以便于第三侧板332与第一侧板312的连接强度。
根据本申请的一些实施例，可选地，负压提供单元20的中心轴线与第一输送辊10的中心轴线平行，且位于第一输送辊10和第二输送辊50之间。
负压提供单元20的中心轴线是指负压提供单元20所提供负压时气流的流动路径的中心线，也可以为负压提供单元20的吸气口24的中心轴线。负压提供单元20的中心轴线位于第一输送辊10和第二输送辊50之间，可以为负压提供单元20的中心轴线到第一输送辊10的中心轴线的距离与到第二输送辊50的中心轴线的距离相同，或者，也可以为负压提供单元20的中心轴线到第一输送辊10的中心轴线的距离小于负压提供单元20的中心轴线到第二输送辊50的中心轴线的距离，又或者，也可以为负压提供单元20的中心轴线到第一输送辊10的中心轴线的距离大于负压提供单元20的中心轴线到第二输送辊50的中心轴线。
负压提供单元20的中心轴线位于第一输送辊10和第二输送辊50之间，以便于保证极耳P2厚度方向的两侧受力均衡，防止极耳P2翻折。
根据本申请的一些实施例，可选地，如图7所示，第二输送辊50的长度小于第一输送辊10的长度，第二输送辊50在极片P上的投影与第一辊段11重合。
第二输送辊50的长度小于第一输送辊10的长度，并且第二输送辊50在第一输送辊10上的投影与第一辊段11重合，以使第二输送辊50与第一输送辊10配合保证极片P输送稳定，并且第二输送辊50不与极耳P2接触，避免极耳P2刮擦第二输送辊50的辊面，避免损伤极耳P2。
请参照图8，图8示出了本申请一些实施例提供的第二输送辊50与第一输送辊10的配合示意图。根据本申请的一些实施例，可选地，如图8所示，第二输送辊 50包括与第一辊段11对应的第三辊段51和与第二辊段12对应的第四辊段52，第四辊段52连接于第三辊段51，第四辊段52的直径小于第三辊段51的直径，第三辊段51用于输送主体部P1，第四辊段52用于与极耳P2对应。
第二输送辊50的结构与第一输送辊10的结构形式相同，第四辊段52与第二辊段12之间形成的空间用于容纳极耳P2，并且极耳P2不与第二辊段12和第四辊段52接触，但是，当极耳P2处气流过大时，第二辊段12和第四辊段52能够对极耳P2起到支撑作用，防止极耳P2翻折。
根据本申请的一些实施例，可选地，第一输送辊10和第二输送辊50中至少一者为从动辊。
第一输送辊10和第二输送辊50中一者可以为从动辊，另一者为带有动力驱动结构的主动辊，例如，第一输送辊10可以为从动辊，第二输送辊50可以为主动辊，第二输送辊50能够带动极片P移动，而第一输送辊10则在极片P的带动下绕自身的中心轴线转动。第一输送辊10和第二输送辊50可以都为从动辊，第一输送辊10和第二输送辊50均在极片P的带动下转动。
第一输送辊10和第二输送辊50中至少一者为从动辊，便于实现对极片P的输送。
在其他实施例中，第一输送辊10和第二输送辊50也可以均为主动辊，但是，需要保证第一输送辊10与第二输送辊50的直径以及转速均相同，以避免使得极片P褶皱。
根据本申请的一些实施例，本申请还提供了一种极片成型设备，其包括放卷机构、收卷机构以及前述任一实施例提供的极片输送机构100。放卷机构用于放卷极片P，收卷机构用于收卷极片P，极片输送机构100设置于放卷机构与收卷机构之间。
极片输送机构100的数量可以为多个，以便于保证极片P输送稳定，保证极片P的输送质量，避免极耳P2翻折。
根据本申请的一些实施例，请参见图1至图8，本申请提供了一种极片输送机构100，其包括第一输送辊10、负压提供单元20、第一支架31及第二支架32。第一输送辊10用于输送极片P，极片P包括主体部P1和凸出于主体部P1的极耳P2。第一输送辊10包括第一辊段11和第二辊段12，第一辊段11的直径大于第二辊段12的直径，第一辊段11用于输送主体部P1，第二辊段12用于与极耳P2对应，极耳P2不与第二辊段12接触。负压提供单元20为空气放大器，空气放大器设置于第一输送辊10的对应极耳P2的一端，沿第一输送辊10的轴向X，空气放大器与第一输送辊10间隔设置。第一输送辊10可转动地连接于第一支架31，空气放大器可活动地连接于第二支架32，第二支架32可活动地连接于第一支架31。空气放大器能够相对于第二支架32沿极片P的厚度方向Z移动，以改变空气放大器与极耳P2在极耳P2的厚度方向上的距离。第二支架32能够相对于第一支架31沿第一输送辊10的轴向X移动，以改变空气放大器与极耳P2在第一输送辊10的轴向X上的距离。
根据本申请实施例的极片输送机构100，在第一输送辊10的对应极耳P2的端部设置空气放大器，通过空气放大器的特性，在极片P的极耳P2周围形成负压，减 少空气阻力，进而减少极耳P2翻折的概率，另外，沿第一输送辊10的轴向X，负压提供单元20与第一输送辊10间隔设置，避免与极耳P2发生摩擦产生粉尘，保证产品质量，从而提高材料的利用率，降低生产成本；同时，负压提供单元20为空气放大器，结构简单，空间占地小，仅靠压缩气体驱动，能耗小，使用安全。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。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 (15)

  1. 一种极片输送机构，包括：
    第一输送辊，用于输送极片；以及
    负压提供单元，设置在所述第一输送辊的至少一端，沿所述第一输送辊的轴向，所述负压提供单元与所述第一输送辊间隔设置，所述负压提供单元用于在所述极片的极耳周围形成负压，以阻止所述极耳翻折。
  2. 根据权利要求1所述的极片输送机构，其中，所述负压提供单元为空气放大器，所述空气放大器包括引流腔、与所述引流腔连通的放大腔以及用于向所述放大腔输送压缩气体的进气口，所述引流腔相对于所述放大腔靠近所述第一输送辊，所述引流腔具有面向所述第一输送辊的吸气口，所述放大腔具有背离所述第一输送辊的排气口，所述压缩气体用于建立负压以使所述引流腔通过所述吸气口将外界气体引入所述放大腔。
  3. 根据权利要求2所述的极片输送机构，其中，所述空气放大器包括第一筒体和第二筒体，部分所述第一筒体套设于所述第二筒体的外部，所述第二筒体的内部形成所述放大腔，所述第一筒体的未套设于所述第二筒体的部分形成所述引流腔，所述进气口设置于所述第一筒体的外周面且贯穿所述第一筒体，所述第一筒体的远离所述第二筒体的一端形成所述吸气口，所述第二筒体的远离所述第一筒体的一端形成所述排气口，所述第一筒体的内周面与所述第二筒体的外周面之间形成环形气流室，所述进气口输入的所述压缩气体经由所述环形气流室后进入所述放大腔。
  4. 根据权利要求3所述的极片输送机构，其中，所述第一筒体可转动地套设于所述第二筒体的外部，所述第一筒体的内壁形成有环形凸台，所述第二筒体的位于所述第一筒体内的端部与所述环形凸台之间形成有环形缝隙，所述环形缝隙与所述环形气流室连通，所述环形气流室内的所述压缩气体经由所述环形缝隙进入所述放大腔。
  5. 根据权利要求1-4中任一项所述的极片输送机构，其中，所述极片输送机构还包括：
    第一支架和第二支架，所述第二支架可活动地连接于所述第一支架，所述第一输送辊可转动地连接于所述第一支架，所述负压提供单元可活动地连接于所述第二支架。
  6. 根据权利要求5所述的极片输送机构，其中，所述第二支架设置有沿所述极片的厚度方向延伸的第一条形孔，所述极片输送机构还包括：
    第一调节件，所述第一调节件连接于所述负压提供单元，所述第一调节件可活动地穿设于所述第一条形孔；
    第一锁紧件，所述第一锁紧件用于与所述第一调节件连接，以将所述负压提供单元锁定于所述第二支架。
  7. 根据权利要求5或6所述的极片输送机构，其中，所述第二支架设置有沿所述第一输送辊的轴向延伸的第二条形孔，所述极片输送机构还包括：
    第二调节件，所述第二调节件连接于所述第一支架，所述第二调节件可活动地穿设于所述第二条形孔；
    第二锁紧件，所述第二锁紧件用于与所述第二调节件连接，以将所述第一支架锁定于所述第二支架。
  8. 根据权利要求1-7中任一项所述的极片输送机构，其中，所述极片包括主体部和凸出于所述主体部的极耳，所述第一输送辊包括沿其轴向依次连接的第一辊段和第二辊段，所述第一辊段的直径大于所述第二辊段的直径，所述第一辊段用于输送所述主体部，所述第二辊段用于与所述极耳对应。
  9. 根据权利要求8所述的极片输送机构，其中，所述第一辊段与所述第二辊段的直径差为2-10mm。
  10. 根据权利要求8或9所述的极片输送机构，其中，所述极片输送机构还包括：
    第二输送辊，与所述第一输送辊相对设置且两者之间形成供所述极片穿过的间隙。
  11. 根据权利要求10所述的极片输送机构，其中，所述负压提供单元的中心轴线与所述第一输送辊的中心轴线平行，且位于所述第一输送辊和所述第二输送辊之间。
  12. 根据权利要求10或11所述的极片输送机构，其中，所述第二输送辊的长度小于所述第一输送辊的长度，所述第二输送辊在所述极片上的投影与所述第一辊段重合。
  13. 根据权利要求10或11所述的极片输送机构，其中，所述第二输送辊包括与所述第一辊段对应的第三辊段和与所述第二辊段对应的第四辊段，所述第四辊段连接于所述第三辊段，所述第四辊段的直径小于所述第三辊段的直径，所述第三辊段用于输送所述主体部，所述第四辊段用于与所述极耳对应。
  14. 根据权利要求10-13中任一项所述的极片输送机构，其中，所述第一输送辊和所述第二输送辊中至少一者为从动辊。
  15. 一种极片成型设备，包括：
    放卷机构，用于放卷极片；
    收卷机构，用于收卷所述极片；
    如权利要求1-14中任一项所述的极片输送机构，所述极片输送机构设置于所述放卷机构与所述收卷机构之间。
PCT/CN2022/073302 2022-01-21 2022-01-21 极片输送机构及极片成型系统 WO2023137724A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209056564U (zh) * 2018-10-31 2019-07-02 宁德时代新能源科技股份有限公司 传送辊以及卷绕机
CN211088438U (zh) * 2019-12-25 2020-07-24 江苏智泰新能源科技有限公司 一种防止锂离子电池极耳褶皱的卷绕装置
CN215236887U (zh) * 2021-05-14 2021-12-21 欣旺达电动汽车电池有限公司 过辊机构和极片加工设备
CN216015617U (zh) * 2021-08-31 2022-03-11 东莞市雅康精密机械有限公司 一种轴式极耳防翻折抚平装置

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* Cited by examiner, † Cited by third party
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CN209056564U (zh) * 2018-10-31 2019-07-02 宁德时代新能源科技股份有限公司 传送辊以及卷绕机
CN211088438U (zh) * 2019-12-25 2020-07-24 江苏智泰新能源科技有限公司 一种防止锂离子电池极耳褶皱的卷绕装置
CN215236887U (zh) * 2021-05-14 2021-12-21 欣旺达电动汽车电池有限公司 过辊机构和极片加工设备
CN216015617U (zh) * 2021-08-31 2022-03-11 东莞市雅康精密机械有限公司 一种轴式极耳防翻折抚平装置

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