WO2022206195A1 - 叠片方法、电芯及叠片系统 - Google Patents

叠片方法、电芯及叠片系统 Download PDF

Info

Publication number
WO2022206195A1
WO2022206195A1 PCT/CN2022/076283 CN2022076283W WO2022206195A1 WO 2022206195 A1 WO2022206195 A1 WO 2022206195A1 CN 2022076283 W CN2022076283 W CN 2022076283W WO 2022206195 A1 WO2022206195 A1 WO 2022206195A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
tape
diaphragm
sheet
polar
Prior art date
Application number
PCT/CN2022/076283
Other languages
English (en)
French (fr)
Inventor
李乾坤
孙晓辉
Original Assignee
蜂巢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.)
Filing date
Publication date
Application filed by 蜂巢能源科技股份有限公司 filed Critical 蜂巢能源科技股份有限公司
Publication of WO2022206195A1 publication Critical patent/WO2022206195A1/zh

Links

Images

Classifications

    • 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
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of power battery manufacturing, for example, to a stacking method, a battery cell and a stacking system.
  • Laminated lithium batteries have been widely used in many fields.
  • the assembly process of laminated cells generally consists of lamination, gluing, preheating, hot pressing, pre-welding, main welding and other processes.
  • the function of the preheating process is to heat the battery cells completed by lamination, so that the temperature inside and outside the battery cells can be uniform;
  • the function of the hot pressing process is to press the electrodes of the battery cells and the diaphragm by means of high pressure and heating. , which is beneficial to improve the performance of the cell.
  • the preheating and hot pressing process takes a long time, which has become a bottleneck restricting the efficiency of the entire laminated cell assembly process.
  • the equipment size and space occupied by the preheating and hot pressing are caused. It increases the area of the workshop, and in order to ensure the same temperature between the center and the outside of the cell, it is necessary to set up preheating equipment before the hot pressing. There are many process steps, which reduces the production efficiency of the cell and increases the Energy consumption increases costs.
  • the present application provides a lamination method, a cell and a lamination system, which ensure the heating effect, reduce the temperature difference between the center and the outer side of the cell, do not need to set a preheating process before pressing the cell, and reduce the process steps.
  • the production efficiency of the battery cell is improved, the energy consumption is also reduced, and the cost is reduced.
  • a lamination method comprising:
  • the first unit sheet includes a first diaphragm sheet, a first polar sheet, a second diaphragm sheet and a second polar sheet distributed from top to bottom piece;
  • the second unit sheet includes a third diaphragm sheet, a first polar sheet and a fourth diaphragm sheet distributed from top to bottom;
  • An electric core is manufactured by applying the above-mentioned lamination method.
  • a lamination system configured to prepare the above-mentioned battery cells, the lamination system comprising a first sheet-making device configured to prepare a first unit sheet and a second sheet-making apparatus configured to prepare a second unit sheet, the
  • the first tableting equipment includes a first feeding component, a first heat sealing component, a first cutting component and a first detection component;
  • the second tableting device includes a second feeding component, a second heat sealing component, and a second cutting component and a second detection component;
  • the first feeding assembly includes a first diaphragm feeding roller, a first polar feeding roller, a second diaphragm feeding roller and a second polar feeding roller, and the first diaphragm feeding roller is configured to supply the first diaphragm feeding roller.
  • a diaphragm belt material, the second diaphragm belt material roller is configured to supply the second diaphragm belt material, the first polar belt material roller is configured to supply the first polar belt material, the second polar belt material roller Set to supply the second polarity tape;
  • the first feeding assembly further includes two first cutting knives, the two first cutting knives are respectively set to cut the first polarity tape and the second cutting knife. Bipolar tape to form a first polar sheet and a second polar sheet;
  • the first feeding component also includes four first discharge machines, one first discharge machine is set on both sides of the first diaphragm strip, and one first discharge machine is set on both sides of the second diaphragm strip.
  • a motor the first discharge motor is configured to perform corona treatment on the first diaphragm material and the second diaphragm material
  • the first feeding component further includes four first rectifiers, the four a first rectifier is set to perform rectification operations on the first diaphragm strip, the second diaphragm strip, the first polar strip, and the second polar strip, respectively;
  • the first heat sealing assembly is placed downstream of the first feeding assembly, and is configured to heat and press the first unit of tape material.
  • the first pre-pressing rollers are provided with two, which are respectively placed on both sides of the first unit strip material, and are arranged to face the first The first diaphragm strip, the second diaphragm strip, the first polar sheet and the second polar sheet in the unit strip are pre-pressed;
  • the first heating element is a heating plate
  • the structure is provided with two, two heating plates are respectively placed on both sides of the first unit belt material, set to heat the first unit belt material;
  • the first hot pressing roller is provided with two, respectively placed On both sides of the first unit tape, it is arranged to measure the first diaphragm tape, the second diaphragm tape, the first polar sheet and the The second polar sheet is pressed together, so that the first diaphragm strip, the second diaphrag
  • the first heat sealing assembly further includes two first polyethylene terephthalate PET film laying assemblies; one first PET film laying assembly is arranged above the first unit tape, and is configured to be the first PET film laying assembly. One unit of tape lays the PET film on the top layer, and another first PET film laying assembly is arranged below the first unit of tape, and is configured to lay the bottom PET film for the first unit of tape; each first PET film
  • the film laying assembly includes a first PET film unwinding roll and a first PET film unwinding roll, the first PET film unwinding roll is placed upstream of the first pre-pressing roll, and the first PET film unwinding roll is placed.
  • the feeding roller is placed downstream of the first hot pressing roller;
  • the first cutting assembly is placed downstream of the first heat sealing assembly, and is configured to cut off the first unit tape to form the first unit sheet;
  • the first cutting assembly includes a second cutting knife, which is arranged at cutting the first unit tape along the gap between two adjacent first polar sheets in the length direction of the first diaphragm tape to form the first unit sheet;
  • the first detection assembly is placed downstream of the first cutting assembly, and is configured to detect the first unit piece, and the first detection component includes a first unit configured to detect the appearance of the first unit piece. an appearance detector, and a first short-circuit detector configured to detect whether the first unit chip is short-circuited;
  • the second feeding assembly includes a third diaphragm feeding roller, a third polar feeding roller and a fourth diaphragm feeding roller; the third diaphragm feeding roller is configured to supply the third diaphragm feeding, and the third diaphragm feeding roller is configured to supply the third diaphragm feeding roller.
  • the four-diaphragm tape rollers are configured to supply the fourth diaphragm tape, and the third polar tape roller is configured to supply the first polar tape;
  • the second feed assembly further includes a third cutting knife, The third cutting knife is configured to cut the first polar tape material to form the first polar sheet;
  • the second feeding component further includes four second discharge machines, the third diaphragm tape Each of the two sides of the material is provided with a second discharger, and each of the two sides of the fourth diaphragm material is provided with a second discharger; the second discharger is set for the third diaphragm.
  • Corona treatment is carried out on the tape and the fourth diaphragm tape;
  • the second feeding component further includes three second rectifiers, and the three second rectifiers are respectively set for the third diaphragm tape.
  • the fourth diaphragm band material and the first polar band material perform a deviation correction operation;
  • the second heat sealing assembly is placed downstream of the second feeding assembly, and is configured to heat and press the second unit of tape material.
  • the second pre-pressing roller, the second heating element and the second hot-pressing roller; the second pre-pressing roller is provided with two, which are respectively placed on both sides of the second unit belt material, and are arranged to face the second pre-pressing roller.
  • the third diaphragm strip, the fourth diaphragm strip and the first polar sheet in the unit strip are pre-pressed;
  • the second heating element is a heating plate structure and is provided with two, two Two heating plates are respectively placed on both sides of the second unit of strip material, and are set to heat the second unit of strip material;
  • two second hot-pressing rollers are provided, which are respectively placed on the second unit of strip material
  • the third diaphragm belt, the fourth diaphragm belt, and the first polar sheet in the second unit belt are press-fitted, so that the third diaphragm belt , the fourth diaphragm strip and the first polar sheet form an integral strip;
  • the second heat sealing assembly further includes two second PET film laying assemblies; one second PET film laying assembly is arranged above the second unit tape, and is configured to lay a top layer of PET film for the second unit tape , another second PET film laying assembly is arranged below the second unit tape, and is configured to lay the bottom PET film for the second unit tape; each second PET film laying assembly includes a second PET film Film unwinding roll and a second PET film unwinding roll, the second PET film unwinding roll is placed upstream of the second pre-pressing roll, and the second PET film unwinding roll is placed on the second hot-pressing roll downstream of the roller;
  • the second cutting assembly is placed downstream of the second heat sealing assembly, and is configured to cut off the second unit tape to form the second unit sheet;
  • the second cutting assembly includes a fourth cutting knife, which is arranged at the cutting the second unit tape along the gap between two adjacent first polar sheets in the length direction of the third diaphragm tape to form the second unit sheet;
  • the second detection assembly is disposed downstream of the second cutting assembly, and is configured to detect the second unit piece, and the second detection unit includes a second unit configured to detect the appearance of the second unit piece. an appearance detection member, and a second short-circuit detection member configured to detect whether the second unit chip is short-circuited.
  • FIG. 1 is a schematic structural diagram of a lamination method provided by an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of a first unit chip provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a second unit chip provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a first production equipment provided in an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a second film-making device provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a stacking process of a stacking method provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an adhesive tape for a lamination method provided in an embodiment of the present application.
  • FIG. 9 is a flow chart of steps of another lamination method provided by an embodiment of the present application.
  • the first filming equipment 101, the first diaphragm feeding roller; 102, the first polar feeding roller; 103, the second diaphragm feeding roller; 104, the second polar feeding roller; 105, the first Cutting knife; 106, the first discharge machine; 107, the first rectifier; 108, the first pre-pressing roller; 109, the first heating element; 1010, the first hot pressing roller; 1011, the first PET film discharging roller; 1012, the first PET film take-up roller; 1013, the second cutting knife; 1014, the first appearance detection piece; 1015, the first short circuit detection piece;
  • the second filming equipment 201, the third diaphragm feeding roller; 202, the third polar feeding roller; 203, the fourth diaphragm feeding roller; 204, the third cutting knife; 205, the second discharge machine; 206, the second rectifier; 207, the second pre-pressing roller; 208, the second heating element; 209, the second hot pressing roller; 2010, the second PET film feeding roller; 2011, the second PET film receiving roller; 2012, the fourth cutting knife; 2013, the second appearance detection piece; 2014, the second short circuit detection piece;
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • connection may be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include the first and second features in direct contact, or may include the first and second features not directly in contact The contact is made through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the lamination method includes:
  • the first unit sheet 901 includes a first diaphragm sheet 1, a first polar sheet 5, a second diaphragm sheet 2 and a top-to-bottom distribution.
  • the second polar plate 6 is a first polar plate 6 .
  • the first diaphragm 1 and the second diaphragm 2 are composed of polyethylene or polypropylene base films, and both sides of the first diaphragm 1 and both sides of the second diaphragm 2 are coated with uniform polyvinylidene fluoride (poly (polyvinylidene fluoride).
  • the thickness of the first diaphragm 1 and the second diaphragm 2 are both 5-20 ⁇ ;
  • the first polar plate 5 is based on copper foil, and both sides of the copper foil are coated with
  • the first electrode layer the material of the first electrode layer includes graphite, silicon oxide, carboxymethyl cellulose, styrene-butadiene rubber, and polyacrylonitrile;
  • the second pole piece 6 is based on aluminum foil, and both sides of the aluminum foil are coated with a second electrode.
  • electrode layer, the material of the second electrode layer includes lithium iron phosphate, nickel cobalt lithium manganate, PVDF, and carbon nanotubes;
  • the heating temperature is 50-120 degrees Celsius, and the pressing pressure is 980-3920N.
  • the second unit sheet 902 includes the third diaphragm sheet 3 , the first polar sheet 5 and the fourth diaphragm sheet 4 distributed from top to bottom.
  • the pressing pressure is 49000-196000N.
  • the first polarity and the second polarity are opposite polarities, for example, the first polarity is a negative electrode, and the second polarity is a positive electrode. Then the first polar sheet 5 is a negative electrode sheet, and the second polar sheet 6 is a positive electrode sheet.
  • the first unit tape 70 and the second unit tape 80 are heated and pressed in advance, and the first unit tape can be used later.
  • the residual temperature on the sheet 901 and the second unit sheet 902 is directly pressed against the cell 90, and only the first unit tape 70 and the second unit tape 80 are heated, which reduces the thickness that needs to be heated, and reduces the size and occupation of the equipment.
  • the first unit sheet 901 and the second unit sheet can be realized Simultaneous processing of 902 saves processing time, and avoids the influence of the qualification rate of the first die 901 on the qualification rate of the second die 902, and the preparation processes of the two are independent of each other.
  • the first unit piece 901 places the pole piece at the bottom layer to avoid damage caused by friction between the diaphragm and the conveyor belt and other conveying structures, so as to ensure the integrity of the diaphragm, thereby avoiding the contact between the positive and negative electrodes, and ensuring safety.
  • the first unit sheet 901 and the second unit sheet 902 are directly used for lamination to form the cell 90, which improves the production efficiency of lamination. By using the form of corona treatment of the separator and heating during the lamination process, the qualified rate of the battery cell 90 is guaranteed, and the consistency of the performance of the plurality of battery cells 90 in mass production is improved.
  • the composite sequence of positive and negative electrode sheets with negative electrode sheets on both the outermost sides of the battery cell 90, it is ensured that lithium ions can completely enter the negative electrode after being deintercalated from the positive electrode, and the number of positive electrode sheets with higher cost is less than the number of negative electrode sheets, and The positive electrode sheet is fully utilized, and the manufacturing cost of the battery cell 90 is reduced.
  • the present application ensures the protection of the risk of scratching the diaphragm during the lamination process, and improves the safety performance of the battery cell 90 .
  • FIG. 5 is a schematic structural diagram of a first production equipment provided by an embodiment of the present application.
  • the first production equipment 100 is configured to prepare a first unit wafer 901 .
  • the first tableting apparatus 100 includes a first feeding assembly, a first heat sealing assembly, and a first cutting assembly.
  • the first feeding assembly includes a first diaphragm feeding roll 101 , a first polar feeding roll 102 , a second diaphragm feeding roll 103 and a second polar feeding roll 104 .
  • the first diaphragm stripping roller 101 is set to supply the first diaphragm strip 10
  • the second diaphragm stripping roller 103 is set to supply the second diaphragm strip 20
  • the first polarity stripping roller 102 is set to supply the first polarity strip
  • the second polar tape roll 104 is arranged to supply the second polar tape 60 .
  • the first feeding assembly further includes two first cutting knives 105 , which are respectively configured to cut the first polar tape 50 and the second polar tape 60 to form the first polar sheet 5 . and the second polarity sheet 6.
  • the first feeding assembly also includes four first dischargers 106 , one first discharger 106 is provided on both sides of the first diaphragm strip 10 , and one first discharger 106 is set on both sides of the second diaphragm strip 20 . .
  • the first discharge machine 106 is capable of corona treating the first separator web 10 and the second separator web 20 .
  • the diaphragm tape used in this embodiment is double-sided with tape, and the tape surface is a smooth surface.
  • the first discharge machine 106 makes the smooth tape surface a rough surface, which improves the adhesion between the diaphragm tape and the pole piece. Effect.
  • the first feeding assembly further includes four first rectifiers 107, and the four first rectifiers 107 are respectively arranged to align the first diaphragm material 10, the second diaphragm material 20, the first polar belt material 50 and the second diaphragm material 50.
  • the polar belt material 60 performs a deviation correction operation to ensure the conveying direction of the above four belt materials, so as to ensure the positive setting between the four belt materials in the first unit belt material 70, so as to avoid the risk of short circuit caused by the contact between the positive electrode and the negative electrode. Improved security.
  • the first diaphragm material 10 and the second diaphragm material 20 pass through the first discharge machine 106 and then pass through the first corrector 107 for correction.
  • the first polar tape 50 and the second polar tape 60 are corrected by the first rectifier 107, and then cut by two first cutting knives 105 to form the first polar sheet 5 and the second polar sheet 6. Only two first discharge machines 106 are shown in FIG. 5 .
  • the first heat-sealing assembly is placed downstream of the first feeding assembly, and the first heat-sealing assembly is configured to heat and press the first unit tape 70 .
  • first pre-pressing rollers 108 which are respectively placed on both sides of the first unit belt 70 , and are arranged to cover the first diaphragm belt 10 , the second diaphragm belt 20 , the first diaphragm belt material 20 , the second diaphragm belt material 20 and the The first polar sheet 5 and the second polar sheet 6 are pre-pressed to prevent the first unit tape 70 from moving between the inner polar sheet and the diaphragm tape during the subsequent heating and pressing process, thereby preventing the positive The contact between the negative electrodes ensures safety.
  • the first heating element 109 is a heating plate structure and is provided with two heating plates.
  • the two heating plates are respectively placed on both sides of the first unit tape 70 to heat the first unit tape 70 and increase the tape on the diaphragm tape. stickiness of the surface.
  • There are two first hot-pressing rollers 1010 which are respectively placed on both sides of the first unit belt 70 , and are arranged to cover the first diaphragm belt 10 , the second diaphragm belt 20 , the first diaphragm belt 20 , the first diaphragm belt.
  • the first polar sheet 5 and the second polar sheet 6 are pressed together, so that the first diaphragm tape 10, the second diaphragm tape 20, the first polar sheet 5 and the second polar sheet 6 form an integral strip, which is convenient for Subsequent cutting, and avoid the contact of positive and negative electrodes.
  • the first hot pressing roller 1010 has a heating function, which ensures that the first unit tape 70 is always heated during the pressing process, and ensures the adhesiveness of the adhesive surface of the diaphragm tape.
  • the hot-pressing roller is a related technology, which will not be repeated here.
  • the first heat sealing assembly further includes two first polyethylene terephthalate (Polyethylene glycol Terephthalate, PET) film laying assemblies. And one of the first PET film laying components is arranged above the first unit tape 70 to lay the top layer of PET film for the first unit tape 70, and the other first PET film laying component is arranged on the first unit tape 70. Below, it is arranged to lay the PET film of the bottom layer for the first unit tape 70 .
  • the PET film is set to protect the first unit tape 70 during the heat sealing process, so as to ensure the qualified rate of the battery cell 90 product.
  • each first PET film laying assembly includes a first PET film unwinding roll 1011 and a first PET film unwinding roll 1012, and the first PET film unwinding roll 1011 is placed on the first pre-pressing roll Upstream of 108 , a first PET film take-up roll 1012 is placed downstream of a first heat press roll 1010 .
  • the first cutting assembly is disposed downstream of the first heat sealing assembly, and is configured to cut the first unit tape 70 to form the first unit sheet 901 .
  • the first cutting assembly includes a second cutting knife 1013 , which is arranged to cut the first unit tape at a gap between two adjacent first polar sheets 5 along the length direction of the first diaphragm tape 10 .
  • the material 70 is formed to form the first die 901 .
  • the first cutting blade 105 and the second cutting blade 1013 are both related technologies, and will not be repeated here.
  • the first sheet-making apparatus 100 further includes a first detection assembly disposed downstream of the first cutting assembly, and the first detection assembly is configured to detect the first unit sheet 901 .
  • the first detection assembly includes a first appearance detection member 1014 configured to detect the appearance of the first die 901 , and a first short circuit detection member 1015 configured to detect whether the first die 901 is short-circuited.
  • the first appearance detection member 1014 and the first short circuit detection member 1015 are related technologies, and details are not described herein again.
  • FIG. 6 shows a second tableting apparatus 200 configured to prepare a second unit wafer 902 .
  • the second tableting device 200 is similar in structure to the first tableting device 100 .
  • the first tableting device 100 and the second tableting device 200 are arranged on the same level.
  • the second tableting apparatus 200 includes a second feeding assembly, a second heat sealing assembly, and a second cutting assembly.
  • the second feeding assembly includes a third membrane stripping roll 201 , a third polar stripping roll 202 and a fourth membrane stripping roll 203 .
  • the third diaphragm stripping roll 201 is set to supply the third membrane strip 30, the fourth membrane stripping roll 203 is set to supply the fourth membrane strip 40, and the third polarity stripping roll 202 is set to supply the first polarity strip Material 50.
  • the second feeding assembly further includes a third cutting knife 204 , and the third cutting knife 204 is configured to cut the first polar tape 50 to form the first polar sheet 5 .
  • the second feed assembly also includes four second dischargers 205 , one for each of the two sides of the third diaphragm strip 30 , and one for each of the two sides of the fourth diaphragm strip 40 A second discharger 205.
  • the second discharge machine 205 is capable of corona treating the third separator web 30 and the fourth separator web 40 .
  • the diaphragm tape used in this embodiment is double-sided with tape, and the tape surface is a smooth surface.
  • the second discharge machine 205 makes the smooth tape surface a rough surface, which improves the adhesion between the diaphragm tape and the pole piece. Effect.
  • the second feeding assembly further includes three second rectifiers 206 , and the three second rectifiers 206 are respectively configured to perform rectification operations on the third diaphragm tape 30 , the fourth diaphragm tape 40 and the first polar tape 50 . , to ensure the conveying direction of the above-mentioned three strips, so as to ensure that the three strips in the second unit strip 80 are set in the opposite direction, avoiding the negative pole in the first unit piece 901 and the positive pole in the second unit piece 902. Risk of short-circuit due to contact for increased safety.
  • the third diaphragm material 30 and the fourth diaphragm material 40 pass through the second discharge machine 205 first and then pass through the second corrector 206 for correction.
  • the first polarity tape 50 is corrected by the second deviation correcting device 206 , and then is cut by the third cutting knife 204 to form the first polarity sheet 5 . Only two second discharge machines 205 are shown in FIG. 6 .
  • the second heat sealing assembly is disposed downstream of the second feeding assembly, and the second heat sealing assembly is configured to heat and press the second unit tape 80 .
  • There are two second pre-pressing rollers 207 which are respectively placed on both sides of the second unit strip 80 , and are set to cover the third diaphragm strip 30 , the fourth diaphragm strip 40 and the third diaphragm strip 40 in the second unit strip 80 .
  • a polar sheet 5 is pre-pressed to prevent the second unit strip 80 from moving between the inner pole piece and the diaphragm strip during the subsequent heating and pressing process, thereby avoiding the negative electrode in the first unit sheet 901.
  • the second heating element 208 is a heating plate structure and is provided with two heating plates.
  • the two heating plates are respectively placed on both sides of the second unit tape 80 to heat the second unit tape 80 and increase the adhesive tape on the diaphragm tape. stickiness of the surface.
  • There are two second hot-pressing rollers 209 which are respectively placed on both sides of the second unit strip 80 , and are set to cover the third diaphragm strip 30 , the fourth diaphragm strip 40 and the third diaphragm strip 40 in the second unit strip 80 .
  • the second hot pressing roller 209 has a heating function, which ensures that the second unit tape 80 is always heated during the pressing process, and ensures the adhesiveness of the adhesive surface of the diaphragm tape.
  • the hot-pressing roller is a related technology, which will not be repeated here.
  • the second heat seal assembly also includes two second PET film lay-up assemblies. And one of the second PET film laying components is arranged above the second unit tape 80 to lay the top layer of PET film for the second unit tape 80 , and the other second PET film laying component is arranged on the second unit tape 80 . Below, it is arranged to lay the PET film of the bottom layer for the second unit tape 80 .
  • the PET film is set to protect the second unit tape 80 during the heat sealing process, so as to ensure the qualified rate of the battery cell 90 product.
  • each second PET film laying assembly includes a second PET film unwinding roll 2010 and a second PET film unwinding roll 2011, and the second PET film unwinding roll 2010 is placed on the second pre-press Upstream of the roll 207 , a second PET film take-up roll 2011 is placed downstream of the second heat and pressure roll 209 .
  • the second cutting assembly is disposed downstream of the second heat sealing assembly, and is configured to cut the second unit tape 80 to form the second unit sheet 902 .
  • the second cutting assembly includes a fourth cutting knife 2012 , which is arranged to cut the second unit tape in the gap between two adjacent first polar sheets 5 along the length direction of the third diaphragm tape 30 .
  • the material 80 is formed to form the second die 902 .
  • the third cutting blade 204 and the fourth cutting blade 2012 are related technologies, and are not repeated here.
  • the second tableting apparatus 200 also includes a second detection assembly positioned downstream of the second cutting assembly.
  • the second detection assembly is configured to detect the second die 902 .
  • the second detection assembly includes a second appearance detection member 2013 configured to detect the appearance of the second die 902, and a second short circuit detection member 2014 configured to detect whether the second die 902 is short-circuited.
  • the second appearance detecting element 2013 and the second short-circuit detecting element 2014 are related technologies, and details are not described herein again.
  • the first polarity is a negative electrode
  • the second polarity is a positive electrode
  • the first polarity tape material 50 is a negative electrode tape material
  • the second polarity tape material 60 is a negative electrode tape material.
  • FIG. 9 is a flow chart of steps of another lamination method provided in this embodiment.
  • the lamination process will be described below with reference to FIGS. 1 to 9 .
  • the lamination process includes:
  • step S1 of this embodiment
  • pre-compression is performed using two first pre-compression rolls 108 .
  • the first polar tape 50 and the second polar tape 60 are first corrected by the first rectifier 107, and then cut by the first cutting knife 105 to form the first polar sheet 5 and the second polar sheet 6, which is convenient for the actual situation.
  • the length of the first polar tape material 50 and the second polar tape material 60 needs to be cut, which expands the scope of application.
  • the deflection is corrected by the first deflection corrector 107 , which ensures the accuracy of the shape and size of the pole piece, and ensures the pass rate of the battery cell 90 .
  • a plurality of first polar sheets 5 and a plurality of second polar sheets 6 are arranged at intervals along the length direction of the first diaphragm tape 10, and the first diaphragm tape 10 It extends parallel to and in the same direction as the second membrane web 20 .
  • the plurality of first polar plates 5 and the plurality of second polar plates 6 are arranged in a one-to-one manner.
  • the method further includes: S10 , corona treating the first diaphragm material 10 and the second diaphragm material 20 .
  • S10 corona treating the first diaphragm material 10 and the second diaphragm material 20 .
  • Using the first discharge machine 106 to perform corona treatment on the first diaphragm material 10 and the second diaphragm material 20 increases the roughness of the adhesive surface of the diaphragm material, which is convenient for sticking with the pole piece, and also improves the separation of the diaphragm and the material. The firmness of the connection between the pole pieces.
  • the first rectifier 107 rectifies the deviation of the first diaphragm strip 10 and the second diaphragm strip 20 to ensure the position of the subsequent diaphragm, correct the change of the position of the diaphragm caused by the corona treatment, and ensure that the diaphragm can Covered on the pole piece, the contact between the positive and negative electrodes is avoided, and the safety is ensured.
  • the corona voltage is 2.0-4.0KV.
  • the first heating element 109 is used to heat the pre-pressed first unit tape 70 to make the adhesive surface of the diaphragm in the first unit tape 70 sticky, which facilitates the connection with the pole pieces.
  • the heating temperature is 50-120 degrees Celsius
  • the pressing pressure is 980-3920N.
  • step S13 pressing the heated first unit tape 70 .
  • the heated first unit tapes 70 are pressed together, so that the first unit tapes 70 are formed into an overall tape shape, which is convenient for subsequent cutting.
  • step S13 the first unit strip material 70 is pressed by the first hot pressing roller 1010, and the first hot pressing roller 1010 has a heating function to ensure that the first unit strip material 70 is always heated during the pressing process, ensuring that the diaphragm The stickiness of the adhesive side of the tape.
  • the first unit sheet 901 includes a first diaphragm sheet 1, a first polar sheet 5, a second diaphragm sheet 2 and a top-to-bottom distribution.
  • the second polar plate 6 is a first polar plate 6 .
  • the second cutting knife 1013 is arranged as two adjacent first polar pieces along the length direction of the first separator tape 10 The gap between 5 cuts the first unit tape 70 to form the first unit sheet 901 .
  • Step S3 includes:
  • the first polarity tape 50 is first corrected by the second rectifier 206, and then cut by the third cutting knife 204 to form the first polarity sheet 5, which is convenient for cutting the first polarity tape 50 according to the actual length requirements, and expands the application. scope. And before being cut by the third cutting blade 204 , the deflection is corrected by the second deflection corrector 206 , which ensures the accuracy of the shape and size of the pole piece, and ensures the pass rate of the battery cell 90 .
  • the second unit tape 80 a plurality of first polar sheets 5 are arranged at intervals along the length direction of the third diaphragm tape 30, and the third diaphragm tape 30 and the fourth diaphragm tape 40 are parallel and parallel to each other. extend in the same direction.
  • the method further includes: S30 , corona treating the third diaphragm material 30 and the fourth diaphragm material 40 .
  • the second discharge machine 205 is used to perform corona treatment on the third diaphragm material 30 and the fourth diaphragm material 40, which increases the roughness of the adhesive surface of the diaphragm material and is convenient for sticking with the pole piece. , which also improves the firmness of the connection between the diaphragm and the pole piece.
  • the second rectifier 206 rectifies the deviation of the third diaphragm strip 30 and the fourth diaphragm strip 40 to ensure the position of the subsequent diaphragm, correct the change of the position of the diaphragm caused by the corona treatment, and ensure that the diaphragm can Covered on the pole piece, the contact between the positive and negative electrodes is avoided, and the safety is ensured.
  • the second heating element 208 is used to heat the pre-pressed second unit tape 80, so that the adhesive surface of the diaphragm in the second unit tape 80 is viscous, so as to facilitate connection with the pole pieces.
  • step S33 pressing the heated second unit tape 80 , and pressing the heated second unit tape 80 to make the second unit tape 80 form an overall tape shape, which is convenient for subsequent cutting to form the second unit sheet 902 .
  • the second unit tape 80 is pressed with the second hot pressing roller 209.
  • the second hot pressing roller 209 can not only perform the pressing function but also play a heat preservation role, which further ensures the viscosity of the diaphragm tape.
  • the second unit sheet 902 includes the third diaphragm sheet 3 , the first polar sheet 5 and the fourth diaphragm sheet 4 distributed from top to bottom.
  • the second unit tape 80 is cut off to form the second unit piece 902 using a fourth cutting knife 2012 , which is arranged as two adjacent first polar pieces along the length direction of the third diaphragm tape 30 The gap between 5 cuts the second unit tape 80 to form the second unit sheet 902.
  • a second cell 902 is first placed on the stacking platform, and the first cell 901 is sequentially stacked on top of the second cell 902 to form the cell 90 .
  • the pole piece in the second cell piece 902 is the first polarity piece 5
  • the second pole piece 6 of the first cell piece 901 is placed downward and toward the second cell piece 902 , so that the first polar sheet 5 - the second polar sheet 6 - the first polar sheet 5 - the second polar sheet 6 are alternately arranged, and the number of the first unit sheets 901 is not limited.
  • each time the first cell 901 is stacked it also includes calibrating the first cell 901 , using the image capturing element 300 to be placed just above the cell 90 to facilitate observation and correction of the position of the first cell 901 .
  • the image capturing component 300 may be a charge coupled device (Charge Coupled Device, CCD) camera, etc., which is not limited herein.
  • a heating plate is arranged below the second unit sheet 902 , and the heating temperature of the heating plate is 50-90 degrees Celsius, and the heating plate can play a role of heat preservation. Since both the first unit tape 70 and the second unit tape 80 are heated during the pressing process, the first unit sheet 901 and the second unit sheet 902 are both left with residual temperature, and the provision of a heating plate can slow down the first unit The speed at which the temperature of the sheet 901 and the second unit sheet 902 decreases is convenient for the subsequent overall pressing of the cells 90 .
  • the heating plate is fixed on the lamination platform, and the second cell 902 of the battery cell 90 is placed on the heating plate.
  • the battery cells 90 are integrally pressed, so that the battery cells 90 are formed as a whole, which is convenient for transportation and storage. Further, during the pressing process, the battery cells 90 are always placed on the heating plate, so that the heating plate always plays a role of heat preservation during the pressing process and ensures the firmness of the connection between the pole piece and the diaphragm.
  • the device for pressing the battery cell 90 is a related art, and details are not described herein again.
  • the method further includes: S7 , sticking the adhesive tape 7 on the outside of the battery core 90 .
  • a sticking tape 7 is wound around the outside of the cell 90, and the tape 7 is used to bundle the cell 90 into an integral structure, which is convenient for transportation and transfer, ensures the alignment between the pole pieces in the cell 90, and ensures that the cell 90 is aligned. pass rate.
  • the adhesive tape 7 can be directly wrapped around the side wall of the battery core 90 to adhere a plurality of pole pieces and diaphragms to the adhesive tape 7 .
  • the adhesive tape 7 can be divided into multiple sections, each section is set in a U shape, the two straight sides are respectively attached to the diaphragm sheets at both ends of the cell 90 , and the connecting edge between the two straight sides is attached to the cell 90 side.
  • the method further includes: S8 , detecting the battery cell 90 .
  • the short circuit test and the detection of the outer thickness dimension are performed on the whole cell 90 . In other embodiments, other types of detection may also be performed on the battery cell 90 , which is not limited herein.
  • the detection battery 90 includes: detecting the resistance value of the battery 90, wherein the detection voltage is 50-300V, and the detection time is 3-5s; the thickness of the battery 90 is detected, wherein the pressure during detection is 490-4900N; The size of the core 90, wherein the width of the battery core 90 is 50-200mm, and the length of the battery core 90 is 100-1500mm.

Abstract

本文公开了一种叠片方法、电芯及叠片系统。叠片方法，包括：加热压合第一单元带料；裁切第一单元带料，以形成第一单元片；加热压合第二单元带料；裁切第二单元带料，以形成第二单元片；将一个第二单元片和至少一个第一单元片由下至上依次叠放，形成电芯；压合电芯。

Description

叠片方法、电芯及叠片系统
本申请要求在2021年03月31日提交中国专利局、申请号为202110352049.3的中国专利申请的优先权，该申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及动力电池制造技术领域，例如涉及一种叠片方法、电芯及叠片系统。
背景技术
叠片式锂电池在多个领域内得到了广泛应用，叠片电芯的装配工艺一般由叠片，贴胶，预热，热压，预焊，主焊等工序组成。其中，预热工序的作用为将叠片完成的电芯进行加热，使电芯内外能够温度均一；热压工序的作用为通过大压力与加热的方式，将电芯电极与隔膜之间压合，有利于提升电芯性能。但是预热以及热压工序的时间较长，成为制约整个叠片电芯装配工艺效率的瓶颈，而且由于将整个电芯进行预热、热压，导致预热和热压的设备尺寸及占用空间增大，加大了厂房面积，且为了保证电芯的中心与外侧之间的温度相同，需要在热压之前设置预热设备，工序步骤较多，降低了电芯的生产效率，也增加了能源的消耗，提高了成本。
发明内容
本申请提供一种叠片方法、电芯及叠片系统，保证了加热效果，且降低了电芯中心与外侧的温度差，无需在压合电芯之前设置预热工序，减少了工序步骤，提高了电芯的生产效率，也降低了能源的消耗，降低了成本。
一种叠片方法，包括：
加热压合第一单元带料；
裁切所述第一单元带料，以形成第一单元片，所述第一单元片包括由上至下分布的第一隔膜片、第一极性片、第二隔膜片和第二极性片；
加热压合第二单元带料；
裁切所述第二单元带料，以形成第二单元片，所述第二单元片包括由上至下分布的第三隔膜片、第一极性片和第四隔膜片；
将一个第二单元片和至少一个第一单元片由下至上依次叠放，形成电芯；
压合所述电芯。
一种电芯，应用上述的叠片方法制作而成。
一种叠片系统，设置为制备上述的电芯，所述叠片系统包括设置为制备第一单元片的第一制片设备和设置为制备第二单元片的第二制片设备，所述第一制片设备包括第一供料组件、第一热合组件、第一切断组件以及第一检测组件；所述第二制片设备包括第二供料组件、第二热合组件、第二切断组件以及第二检测组件；
所述第一供料组件包括第一隔膜带料辊、第一极性带料辊、第二隔膜带料辊和第二极性带料辊，所述第一隔膜带料辊设置为供给第一隔膜带料，所述第二隔膜带料辊设置为供给第二隔膜带料，所述第一极性带料辊设置为供给第一极性带料，所述第二极性带料辊设置为供给第二极性带料；所述第一供料组件还包括两个第一裁断刀，所述两个第一裁断刀分别设置为裁断所述第一极性带料和所述第二极性带料，以形成第一极性片和第二极性片；
所述第一供料组件还包括四个第一放电机，所述第一隔膜带料的两侧均设置一个第一放电机，所述第二隔膜带料的两侧均设置一个第一放电机；所述第一放电机设置为对所述第一隔膜带料和所述第二隔膜带料进行电晕处理；所述第一供料组件还包括四个第一纠偏器，所述四个第一纠偏器设置为分别对所述第一隔膜带料、所述第二隔膜带料、所述第一极性带料和所述第二极性带料进行纠偏操作；
所述第一热合组件置于所述第一供料组件的下游，设置为加热压合第一单元带料，所述第一热合组件包括沿所述第一单元带料的输送方向依次设置的第一预压辊、第一加热件和第一热压辊；所述第一预压辊设置有两个，分别置于所述第一单元带料的两侧，设置为对所述第一单元带料内的所述第一隔膜带料、所述第二隔膜带料、所述第一极性片和所述第二极性片进行预压合；所述第一加热件为加热板结构且设置有两个，两个加热板分别置于所述第一单元带料的两侧，设置为加热所述第一单元带料；所述第一热压辊设置有两个，分别置于所述第一单元带料的两侧，设置为对所述第一单元带料内的所述第一隔膜带料、所述第二隔膜带料、所述第一极性片和所述第二极性片进行压合，使得所述第一隔膜带料、所述第二隔膜带料、所述第一极性片和所述第二极性片形成整体带状；
所述第一热合组件还包括两个第一聚对苯二甲酸乙二醇酯PET膜铺设组件；一个第一PET膜铺设组件设置在所述第一单元带料上方，设置为为所述第一单元带料铺设顶层的PET膜，另一个第一PET膜铺设组件设置在所述第一单元带料下方，设置为为所述第一单元带料铺设底层的PET膜；每个第一PET膜铺设 组件包括一个第一PET膜放料辊和一个第一PET膜收料辊，所述第一PET膜放料辊置于所述第一预压辊的上游，所述第一PET膜收料辊置于所述第一热压辊的下游；
所述第一切断组件置于所述第一热合组件的下游，设置为切断所述第一单元带料形成所述第一单元片；所述第一切断组件包括第二裁断刀，设置为在沿所述第一隔膜带料的长度方向上的相邻两个第一极性片之间的间隙切断所述第一单元带料，以形成所述第一单元片；
所述第一检测组件置于所述第一切断组件的下游，设置为对所述第一单元片进行检测，所述第一检测组件包括设置为检测所述第一单元片的外观的第一外观检测件，以及设置为检测所述第一单元片是否短路的第一短路检测件；
所述第二供料组件包括第三隔膜带料辊、第三极性带料辊和第四隔膜带料辊；所述第三隔膜带料辊设置为供给第三隔膜带料，所述第四隔膜带料辊设置为供给第四隔膜带料，所述第三极性带料辊设置为供给所述第一极性带料；所述第二供料组件还包括一个第三裁断刀，所述第三裁断刀设置为裁断所述第一极性带料，以形成所述第一极性片；所述第二供料组件还包括四个第二放电机，所述第三隔膜带料的两侧中的每侧设置一个第二放电机，所述第四隔膜带料的两侧中的每侧设置一个第二放电机；所述第二放电机设置为对所述第三隔膜带料和所述第四隔膜带料进行电晕处理；所述第二供料组件还包括三个第二纠偏器，所述三个第二纠偏器分别设置为对所述第三隔膜带料、所述第四隔膜带料和所述第一极性带料进行纠偏操作；
所述第二热合组件置于所述第二供料组件的下游，设置为加热压合第二单元带料，所述第二热合组件包括沿所述第二单元带料的输送方向依次设置的第二预压辊、第二加热件和第二热压辊；所述第二预压辊设置有两个，分别置于所述第二单元带料的两侧，设置为对所述第二单元带料内的所述第三隔膜带料、所述第四隔膜带料和所述第一极性片进行预压合；所述第二加热件为加热板结构且设置有两个，两个加热板分别置于所述第二单元带料的两侧，设置为加热所述第二单元带料；所述第二热压辊设置有两个，分别置于所述第二单元带料的两侧，设置为对所述第二单元带料内的所述第三隔膜带料、所述第四隔膜带料和是第一极性片进行压合，使得所述第三隔膜带料、所述第四隔膜带料和所述第一极性片形成整体带状；
所述第二热合组件还包括两个第二PET膜铺设组件；一个第二PET膜铺设组件设置在所述第二单元带料上方，设置为为所述第二单元带料铺设顶层的PET膜，另一个第二PET膜铺设组件设置在所述第二单元带料下方，设置为为所述第二单元带料铺设底层的PET膜；每个第二PET膜铺设组件均包括一个第二 PET膜放料辊和一个第二PET膜收料辊，所述第二PET膜放料辊置于所述第二预压辊的上游，所述第二PET膜收料辊置于第二热压辊的下游；
所述第二切断组件置于所述第二热合组件的下游，设置为切断所述第二单元带料形成所述第二单元片；所述第二切断组件包括第四裁断刀，设置为在沿所述第三隔膜带料的长度方向上的相邻两个第一极性片之间的间隙切断所述第二单元带料，以形成所述第二单元片；
所述第二检测组件置于所述第二切断组件的下游，设置为对所述第二单元片进行检测，所述第二检测组件包括设置为检测所述第二单元片的外观的第二外观检测件，以及设置为检测所述第二单元片是否短路的第二短路检测件。
附图说明
图1是本申请实施例提供的一种叠片方法的结构示意图；
图2是本申请实施例提供的一种叠片方法的步骤流程图；
图3是本申请实施例提供的一种第一单元片的结构示意图；
图4是本申请实施例提供的一种第二单元片的结构示意图；
图5是本申请实施例提供的一种第一制片设备的结构示意图；
图6是本申请实施例提供的一种第二制片设备的结构示意图；
图7是本申请实施例提供的一种叠片方法的堆叠过程的结构示意图；
图8是本申请实施例提供的一种叠片方法的贴覆胶带的结构示意图；
图9是本申请实施例提供的另一种叠片方法的步骤流程图。
图中：
10、第一隔膜带料；20、第二隔膜带料；30、第三隔膜带料；40、第四隔膜带料；50、第一极性带料；60、第二极性带料；70、第一单元带料；80、第二单元带料；90、电芯；901、第一单元片；902、第二单元片；
1、第一隔膜片；2、第二隔膜片；3、第三隔膜片；4、第四隔膜片；5、第一极性片；6、第二极性片；7、胶带；
100、第一制片设备；101、第一隔膜带料辊；102、第一极性带料辊；103、第二隔膜带料辊；104、第二极性带料辊；105、第一裁断刀；106、第一放电机；107、第一纠偏器；108、第一预压辊；109、第一加热件；1010、第一热压辊；1011、第一PET膜放料辊；1012、第一PET膜收料辊；1013、第二裁断刀；1014、第一外观检测件；1015、第一短路检测件；
200、第二制片设备；201、第三隔膜带料辊；202、第三极性带料辊；203、第四隔膜带料辊；204、第三裁断刀；205、第二放电机；206、第二纠偏器；207、第二预压辊；208、第二加热件；209、第二热压辊；2010、第二PET膜放料辊；2011、第二PET膜收料辊；2012、第四裁断刀；2013、第二外观检测件；2014、第二短路检测件；
300、图像采集件。
具体实施方式
下面将结合附图对本申请实施例的技术方案进行描述，所描述的实施例仅仅是本申请一部分实施例。
在本申请的描述中，除非另有规定和限定，术语“相连”、“连接”、“固定”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；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，可以根据情况理解上述术语在本申请中的含义。
在本申请中，除非另有规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下面结合附图并通过具体实施方式来说明本申请的技术方案。
本实施例提供了一种叠片方法。如图1-图9所示，叠片方法包括：
S1、加热压合第一单元带料70。
S2、裁切第一单元带料70，以形成第一单元片901，第一单元片901包括由上至下分布的第一隔膜片1、第一极性片5、第二隔膜片2和第二极性片6。
第一隔膜片1、第二隔膜片2由聚乙烯或者聚丙烯的基膜组成，并第一隔膜片1的两边和第二隔膜片2的两边均涂有均匀的聚偏氟乙烯(poly(1,1-difluoroethylene)，PVDF)或者陶瓷层，第一隔膜片1和第二隔膜片2的厚度均为5-20μ；第一极性片5以铜箔为基体，铜箔两边涂覆有第一电极层，第一电极层的材料包含石墨、硅氧化物、羧甲基纤维素、丁苯橡胶、和聚丙烯腈；第二极片6以铝箔为基体，铝箔两边涂覆有第二电极层，第二电极层的材 料包含磷酸铁锂、镍钴锰酸锂、PVDF、和碳纳米管；
S3、加热压合第二单元带料80。
加热温度为50-120摄氏度，压合压力为980-3920N。
S4、裁切第二单元带料80，以形成第二单元片902，第二单元片902包括由上至下分布的第三隔膜片3、第一极性片5和第四隔膜片4。
S5、将一个第二单元片902和至少一个第一单元片901由下至上依次叠放，形成电芯90。
S6、压合电芯90。
压合压力为49000-196000N。
在本实施例中，第一极性与第二极性为两个相反极性，例如第一极性为负极，则第二极性为正极。那么第一极性片5为负极片，第二极性片6为正极片。
本实施例提供的叠片方法中，在制备第一单元片901和第二单元片902时，预先对第一单元带料70和第二单元带料80加热压合，后续能够利用第一单元片901与第二单元片902上的余温对电芯90直接压合，仅对第一单元带料70与第二单元带料80加热，缩小了需要加热的厚度，降低了设备尺寸及占用空间，也保证了加热效果，且降低了电芯90中心与外侧的温度差，无需在压合电芯90之前设置预热工序，减少了工序步骤，提高了电芯90的生产效率，也降低了能源的消耗，降低了成本。此外，使用第一单元带料70和第二单元带料80两个单独的带料裁切加工形成第一单元片901和第二单元片902，能够实现第一单元片901和第二单元片902的同时加工，节省了加工时间，且避免了第一单元片901的合格率对于第二单元片902的合格率的影响，二者的制备过程相互独立。而且第一单元片901将极片置于最下层，避免隔膜与传送带等传送结构摩擦导致破损，保证隔膜的完整性，从而避免了正负极相接触，保证了安全性。本实施例直接使用第一单元片901和第二单元片902进行叠片，形成电芯90，提高了叠片的生产效率。通过使用隔膜的电晕处理及在叠片的过程中加热的形式，保证了电芯90产品的合格率，提升了批量生产中多个电芯90性能的一致性。通过设置电芯90最外两侧均为负极片的正负极片复合顺序，保证锂离子从正极脱嵌后能够完全进入负极，造价较高的正极片的数量少于负极片的数量，并对正极片进行充分利用，并且降低了电芯90生产制造成本。本申请保证了复合叠片过程中对隔膜划伤风险的保护，提升了电芯90的安全性能。
图5是本申请实施例提供的一种第一制片设备的结构示意图，第一制片设备100设置为制备第一单元片901。第一制片设备100包括第一供料组件、第一热合组件以及第一切断组件。
第一供料组件包括第一隔膜带料辊101、第一极性带料辊102、第二隔膜带料辊103和第二极性带料辊104。第一隔膜带料辊101设置为供给第一隔膜带料10，第二隔膜带料辊103设置为供给第二隔膜带料20，第一极性带料辊102设置为供给第一极性带料50，第二极性带料辊104设置为供给第二极性带料60。第一供料组件还包括两个第一裁断刀105，两个第一裁断刀105分别设置为裁断第一极性带料50和第二极性带料60，以形成第一极性片5和第二极性片6。
第一供料组件还包括四个第一放电机106，第一隔膜带料10的两侧均设置一个第一放电机106，第二隔膜带料20的两侧均设置一个第一放电机106。第一放电机106能够对第一隔膜带料10和第二隔膜带料20进行电晕处理。本实施例中使用的隔膜带料双面带胶，带胶面为光滑表面，第一放电机106使得光滑的带胶面变为粗糙表面，提高了隔膜带料与极片之间的粘附效果。第一供料组件还包括四个第一纠偏器107，四个第一纠偏器107分别设置为对第一隔膜带料10、第二隔膜带料20、第一极性带料50和第二极性带料60进行纠偏操作，保证上述四个带料的输送方向，以保证第一单元带料70中四个带料之间的正对设置，避免了正极和负极接触导致的短路风险，提高了安全性。其中，第一隔膜带料10和第二隔膜带料20先经过第一放电机106再经过第一纠偏器107纠正。第一极性带料50和第二极性带料60先经过第一纠偏器107纠正，再使用两个第一裁断刀105裁断形成第一极性片5和第二极性片6。图5中仅示出两个第一放电机106。
第一热合组件置于第一供料组件的下游，第一热合组件设置为加热压合第一单元带料70，第一热合组件包括沿第一单元带料70的输送方向依次设置的第一预压辊108、第一加热件109和第一热压辊1010。第一预压辊108设置有两个，分别置于第一单元带料70的两侧，设置为对第一单元带料70内的第一隔膜带料10、第二隔膜带料20、第一极性片5和第二极性片6进行预压合，避免了第一单元带料70在后续加热压合的过程中内部极片与隔膜带料之间产生窜动，从而避免了正负极之间的接触，保证了安全性。第一加热件109为加热板结构且设置有两个，两个加热板分别置于第一单元带料70的两侧，设置为加热第一单元带料70，增大隔膜带料上带胶面的粘性。第一热压辊1010设置有两个，分别置于第一单元带料70的两侧，设置为对第一单元带料70内的第一隔膜带料10、第二隔膜带料20、第一极性片5和第二极性片6进行压合，使得第一隔膜带料10、第二隔膜带料20、第一极性片5和第二极性片6形成整体带状，便于后续裁切，且避免了正负极的接触。在本实施例中，第一热压辊1010具有加热功能，保证在压合过程中始终对于第一单元带料70进行加热，保证了隔膜带料的带胶面的粘性。其中，热压辊为相关技术，在此不再赘述。
第一热合组件还包括两个第一聚对苯二甲酸乙二醇酯(Polyethylene glycol  Terephthalate，PET)膜铺设组件。且其中一个第一PET膜铺设组件设置在第一单元带料70上方，设置为为第一单元带料70铺设顶层的PET膜，另一个第一PET膜铺设组件设置在第一单元带料70下方，设置为为第一单元带料70铺设底层的PET膜。PET膜设置为在热合过程中保护第一单元带料70，保证了电芯90产品的合格率。在本实施例中，每个第一PET膜铺设组件包括一个第一PET膜放料辊1011和一个第一PET膜收料辊1012，第一PET膜放料辊1011置于第一预压辊108的上游，第一PET膜收料辊1012置于第一热压辊1010的下游。
第一切断组件置于第一热合组件的下游，设置为切断第一单元带料70形成第一单元片901。第一切断组件包括第二裁断刀1013，第二裁断刀1013设置为在沿第一隔膜带料10的长度方向上的相邻两个第一极性片5之间的间隙切断第一单元带料70，以形成第一单元片901。其中第一裁断刀105和第二裁断刀1013均为相关技术，在此不再赘述。
第一制片设备100还包括第一检测组件，置于第一切断组件的下游，第一检测组件设置为对第一单元片901进行检测。第一检测组件包括设置为检测第一单元片901的外观的第一外观检测件1014，以及设置为检测第一单元片901是否短路的第一短路检测件1015。其中，第一外观检测件1014和第一短路检测件1015均为相关技术，在此不再赘述。
如图6所示为设置为制备第二单元片902的第二制片设备200，第二制片设备200与第一制片设备100的结构相似。第一制片设备100和所述第二制片设备200布置在同一水平面上。第二制片设备200包括第二供料组件、第二热合组件以及第二切断组件。
第二供料组件包括第三隔膜带料辊201、第三极性带料辊202和第四隔膜带料辊203。第三隔膜带料辊201设置为供给第三隔膜带料30，第四隔膜带料辊203设置为供给第四隔膜带料40，第三极性带料辊202设置为供给第一极性带料50。第二供料组件还包括一个第三裁断刀204，第三裁断刀204设置为裁断第一极性带料50，以形成第一极性片5。第二供料组件还包括四个第二放电机205，第三隔膜带料30的两侧中的每侧设置一个第二放电机205，第四隔膜带料40的两侧中的每侧设置一个第二放电机205。第二放电机205能够对第三隔膜带料30和第四隔膜带料40进行电晕处理。本实施例中使用的隔膜带料双面带胶，带胶面为光滑表面，第二放电机205使得光滑的带胶面变为粗糙表面，提高了隔膜带料与极片之间的粘附效果。第二供料组件还包括三个第二纠偏器206，三个第二纠偏器206分别设置为对第三隔膜带料30、第四隔膜带料40和第一极性带料50进行纠偏操作，保证上述三个带料的输送方向，以保证第二单元带料80中三个带料之间的正对设置，避免了第一单元片901中的负极与第二 单元片902中的正极接触导致的短路风险，提高了安全性。其中，第三隔膜带料30和第四隔膜带料40先经过第二放电机205再经过第二纠偏器206纠正。第一极性带料50先经过第二纠偏器206纠正，再使用第三裁断刀204裁断形成第一极性片5。图6中仅示出两个第二放电机205。
第二热合组件置于第二供料组件的下游，第二热合组件设置为加热压合第二单元带料80，第二热合组件包括沿第二单元带料80的输送方向依次设置的第二预压辊207、第二加热件208和第二热压辊209。第二预压辊207设置有两个，分别置于第二单元带料80的两侧，设置为对第二单元带料80内的第三隔膜带料30、第四隔膜带料40和第一极性片5进行预压合，避免了第二单元带料80在后续加热压合的过程中内部极片与隔膜带料之间产生窜动，从而避免了第一单元片901中的负极与第二单元片902中的正极接触导致的短路风险，保证了安全性。第二加热件208为加热板结构且设置有两个，两个加热板分别置于第二单元带料80的两侧，设置为加热第二单元带料80，增大隔膜带料上带胶面的粘性。第二热压辊209设置有两个，分别置于第二单元带料80的两侧，设置为对第二单元带料80内的第三隔膜带料30、第四隔膜带料40和第一极性片5进行压合，使得第三隔膜带料30、第四隔膜带料40和第一极性片5形成整体带状，便于后续裁切，且避免了正负极的接触。在本实施例中，第二热压辊209具有加热功能，保证在压合过程中始终对于第二单元带料80进行加热，保证了隔膜带料的带胶面的粘性。其中，热压辊为相关技术，在此不再赘述。
第二热合组件还包括两个第二PET膜铺设组件。且其中一个第二PET膜铺设组件设置在第二单元带料80上方，设置为为第二单元带料80铺设顶层的PET膜，另一个第二PET膜铺设组件设置在第二单元带料80下方，设置为为第二单元带料80铺设底层的PET膜。PET膜设置为在热合过程中保护第二单元带料80，保证了电芯90产品的合格率。在本实施例中，每个第二PET膜铺设组件均包括一个第二PET膜放料辊2010和一个第二PET膜收料辊2011，第二PET膜放料辊2010置于第二预压辊207的上游，第二PET膜收料辊2011置于第二热压辊209的下游。
第二切断组件置于第二热合组件的下游，设置为切断第二单元带料80形成第二单元片902。第二切断组件包括第四裁断刀2012，第四裁断刀2012设置为在沿第三隔膜带料30的长度方向上的相邻两个第一极性片5之间的间隙切断第二单元带料80，以形成第二单元片902。其中第三裁断刀204和第四裁断刀2012均为相关技术，在此不再赘述。
第二制片设备200还包括第二检测组件，置于第二切断组件的下游。第二检测组件设置为对第二单元片902进行检测。第二检测组件包括设置为检测第 二单元片902的外观的第二外观检测件2013，以及设置为检测第二单元片902是否短路的第二短路检测件2014。其中，第二外观检测件2013和第二短路检测件2014均为相关技术，在此不再赘述。
本实施例中，第一极性为负极，第二极性为正极，那么第一极性带料50为负极带料，第二极性带料60为负极带料。
图9为本实施例提供的另一种叠片方法的步骤流程图。下面参照图1-图9介绍叠片工艺。叠片工艺包括：
S1、加热压合第一单元带料70。
在本实施例的步骤S1中：
S11、预压合叠放后的第一隔膜带料10、第一极性片5、第二隔膜带料20和第二极性片6，形成第一单元带料70。使用两个第一预压辊108进行预压。
第一极性带料50和第二极性带料60先经过第一纠偏器107纠偏，再经过第一裁断刀105裁断形成第一极性片5和第二极性片6，便于根据实际长度需求裁切第一极性带料50和第二极性带料60，扩大了适用范围。且在经过第一裁断刀105裁切之前，经过第一纠偏器107纠偏，保证了极片外形和尺寸的准确性，保证了电芯90的合格率。本实施例中，第一单元带料70中，多个第一极性片5和多个第二极性片6沿第一隔膜带料10的长度方向间隔排布，第一隔膜带料10和第二隔膜带料20平行且沿同一方向延伸。多个第一极性片5和多个第二极性片6一一正对设置。
步骤S11之前，还包括：S10、电晕处理第一隔膜带料10和第二隔膜带料20。使用第一放电机106对第一隔膜带料10和第二隔膜带料20进行电晕处理，增大了隔膜带料带胶面的粗糙程度，便于与极片贴覆，也提高了隔膜与极片之间的连接牢固程度。在经过电晕处理后，第一纠偏器107对第一隔膜带料10和第二隔膜带料20进行纠偏，保证后续隔膜的位置，纠正电晕处理导致隔膜的位置的改变，保证了隔膜能够覆盖在极片上，避免了正负极接触，保证了安全性。其中，电晕电压为2.0-4.0KV。
S12、加热预压合后的第一单元带料70。使用第一加热件109对预压合后的第一单元带料70加热，使第一单元带料70内的隔膜的带胶面具有粘性，便于与极片之间的连接。其中，加热温度为50-120摄氏度，压合压力为980-3920N。
S13、压合加热后的第一单元带料70。将加热后的第一单元带料70进行压合，使第一单元带料70形成整体带状，便于后续裁切。步骤S13中，使用第一热压辊1010压合第一单元带料70，第一热压辊1010具有加热功能，保证在压合过程中始终对于第一单元带料70进行加热，保证了隔膜带料的带胶面的粘性。
S2、裁切第一单元带料70，以形成第一单元片901，第一单元片901包括由上至下分布的第一隔膜片1、第一极性片5、第二隔膜片2和第二极性片6。
使用第二裁断刀1013将第一单元带料70切断形成第一单元片901，第二裁断刀1013设置为在沿第一隔膜带料10的长度方向上的相邻两个第一极性片5之间的间隙切断第一单元带料70，以形成第一单元片901。
S3、加热压合第二单元带料80。
步骤S3包括：
S31、预压合叠放后的第三隔膜带料30、第一极性片5和第四隔膜带料40，形成第二单元带料80。
第一极性带料50先经过第二纠偏器206纠偏，再经过第三裁断刀204裁断形成第一极性片5，便于根据实际长度需求裁切第一极性带料50，扩大了适用范围。且在经过第三裁断刀204裁切之前，经过第二纠偏器206纠偏，保证了极片外形和尺寸的准确性，保证了电芯90的合格率。本实施例中，第二单元带料80中，多个第一极性片5沿第三隔膜带料30的长度方向间隔排布，第三隔膜带料30和第四隔膜带料40平行且沿同一方向延伸。
步骤S31之前，还包括：S30、电晕处理第三隔膜带料30和第四隔膜带料40。与步骤S10同理，使用第二放电机205对第三隔膜带料30和第四隔膜带料40进行电晕处理，增大了隔膜带料带胶面的粗糙程度，便于与极片贴覆，也提高了隔膜与极片之间的连接牢固程度。在经过电晕处理后，第二纠偏器206对第三隔膜带料30和第四隔膜带料40进行纠偏，保证后续隔膜的位置，纠正电晕处理导致隔膜的位置的改变，保证了隔膜能够覆盖在极片上，避免了正负极接触，保证了安全性。
S32、加热预压合后的第二单元带料80。使用第二加热件208对预压合后的第二单元带料80进行加热，使第二单元带料80内的隔膜的带胶面具有粘性，便于与极片之间的连接。
S33、压合加热后的第二单元带料80，将加热后的第二单元带料80进行压合，使第二单元带料80形成整体带状，便于后续裁切形成第二单元片902。步骤S33中，使用第二热压辊209压合第二单元带料80，第二热压辊209起到压合作用的同时也能够起到保温作用，进一步保证了隔膜带料的粘性。
S4、裁切第二单元带料80，以形成第二单元片902，第二单元片902包括由上至下分布的第三隔膜片3、第一极性片5和第四隔膜片4。
使用第四裁断刀2012将第二单元带料80切断形成第二单元片902，第四裁断刀2012设置为在沿第三隔膜带料30的长度方向上的相邻两个第一极性片5 之间的间隙切断第二单元带料80，以形成第二单元片902。
S5、将一个第二单元片902和至少一个第一单元片901由下至上依次叠放，形成电芯90。
在本实施例中，先将一个第二单元片902放置在叠片平台上，并在第二单元片902的上方依次叠放第一单元片901，形成电芯90。由于第二单元片902中的极片为第一极性片5，故第一单元片901在放置时，第一单元片901的第二极性片6向下并朝向第二单元片902放置，以使第一极性片5-第二极性片6-第一极性片5-第二极性片6交替排布，第一单元片901的数量不作限定。
在步骤S4中，每次叠放第一单元片901时，还包括校正第一单元片901，使用图像采集件300设置在电芯90的正上方，便于观察校正第一单元片901的位置。图像采集件300可为电荷耦合器件(Charge Coupled Device，CCD)相机等，在此不作限定。
步骤S5中，第二单元片902的下方设置有加热板，加热板的加热温度为50-90摄氏度，设置加热板能够起到保温的作用。由于第一单元带料70和第二单元带料80在压合的过程中均被加热，从而使得第一单元片901和第二单元片902均留有余温，设置加热板能够减缓第一单元片901和第二单元片902的温度降低的速度，便于后续电芯90的整体压合。加热板固定在叠片平台上，电芯90的第二单元片902置于加热板上。
S6、压合电芯90。
对电芯90进行整体压合，使得电芯90形成一个整体，便于运输和存储。进一步地，在压合过程中，电芯90始终放置在加热板上，使得压合的过程中加热板始终起到保温作用，保证极片与隔膜之间的连接的牢固程度。此外，对电芯90压合的装置为相关技术，在此不再赘述。
步骤S6之后，还包括：S7、在电芯90外部贴覆胶带7。
在电芯90外侧绕设贴覆胶带7，采用胶带7将电芯90捆扎为一个整体结构，便于运输和转移，保证了电芯90内的极片之间的对齐度，保证了电芯90的合格率。在本实施例中，可直接在电芯90的侧壁绕包胶带7将多个极片和隔膜粘接在胶带7上。在其他实施例中，胶带7可分为多段，每段均设置为U型，两直边分别贴附在电芯90两端的隔膜片上，两直边之间的连接边贴附在电芯90的侧面。
步骤S7之后，还包括：S8、检测电芯90。对电芯90整体进行短路测试以及外部厚度尺寸的检测。在其他实施例中，还可对电芯90进行其他种类的检测，在此不作限定。
检测电芯90，包括：检测电芯90的电阻值，其中，检测电压为50-300V，检测时间为3-5s；检测电芯90的厚度，其中，检测时压力为490-4900N；检测电芯90的尺寸，其中，电芯90的宽度为50-200mm，电芯90的长度为100-1500mm。

Claims (12)

  1. 一种叠片方法，包括：
    加热压合第一单元带料(70)；
    裁切所述第一单元带料(70)，以形成第一单元片(901)，其中，所述第一单元片(901)包括由上至下分布的第一隔膜片(1)、第一极性片(5)、第二隔膜片(2)和第二极性片(6)；
    加热压合第二单元带料(80)；
    裁切所述第二单元带料(80)，以形成第二单元片(902)，其中，所述第二单元片(902)包括由上至下分布的第三隔膜片(3)、第一极性片(5)和第四隔膜片(4)；
    将一个第二单元片(902)和至少一个第一单元片(901)由下至上依次叠放，形成电芯(90)；
    压合所述电芯(90)。
  2. 根据权利要求1所述的叠片方法，其中，所述一个第二单元片(902)的下方设置有加热板。
  3. 根据权利要求1所述的叠片方法，其中，所述加热压合第一单元带料(70)，包括：
    预压合叠放后的第一隔膜带料(10)、所述第一极性片(5)、第二隔膜带料(20)和所述第二极性片(6)，形成所述第一单元带料(70)；
    加热预压合后的所述第一单元带料(70)；
    压合加热后的所述第一单元带料(70)。
  4. 根据权利要求3所述的叠片方法，其中，所述压合加热后的所述第一单元带料(70)，包括：
    使用第一热压辊(1010)压合所述第一单元带料(70)。
  5. 根据权利要求3所述的叠片方法，在所述预压合叠放后的第一隔膜带料(10)、所述第一极性片(5)、第二隔膜带料(20)和所述第二极性片(6)，形成所述第一单元带料(70)之前，还包括：
    电晕处理所述第一隔膜带料(10)和所述第二隔膜带料(20)。
  6. 根据权利要求1所述的叠片方法，其中，所述加热压合第二单元带料(80)，包括：
    预压合叠放后的第三隔膜带料(30)、所述第一极性片(5)和第四隔膜带 料(40)，形成所述第二单元带料(80)；
    加热预压合后的所述第二单元带料(80)；
    压合加热后的所述第二单元带料(80)。
  7. 根据权利要求6所述的叠片方法，其中，所述压合加热后的所述第二单元带料(80)，包括：
    使用第二热压辊(209)压合所述第二单元带料(80)。
  8. 根据权利要求6所述的叠片方法，在所述预压合叠放后的第三隔膜带料(30)、所述第一极性片(5)和第四隔膜带料(40)，形成所述第二单元带料(80)之前，还包括：
    电晕处理所述第三隔膜带料(30)和所述第四隔膜带料(40)。
  9. 根据权利要求1-8任一项所述的叠片方法，在所述压合所述电芯(90)之后，还包括：
    在所述电芯(90)外部贴覆胶带(7)。
  10. 根据权利要求9所述的叠片方法，在所述在所述电芯(90)外部贴覆胶带(7)之后，还包括：
    检测所述电芯(90)。
  11. 一种电芯，应用如权利要求1-10任一项所述的叠片方法制作而成。
  12. 一种叠片系统，设置为制备权利要求11所述的电芯，所述叠片系统包括设置为制备第一单元片(901)的第一制片设备(100)和设置为制备第二单元片(902)的第二制片设备(200)，所述第一制片设备(100)包括第一供料组件、第一热合组件、第一切断组件以及第一检测组件；所述第二制片设备(200)包括第二供料组件、第二热合组件、第二切断组件以及第二检测组件；
    所述第一供料组件包括第一隔膜带料辊(101)、第一极性带料辊(102)、第二隔膜带料辊(103)和第二极性带料辊(104)，所述第一隔膜带料辊(101)设置为供给第一隔膜带料(10)，所述第二隔膜带料辊(103)设置为供给第二隔膜带料(20)，所述第一极性带料辊(102)设置为供给第一极性带料(50)，所述第二极性带料辊(104)设置为供给第二极性带料(60)；所述第一供料组件还包括两个第一裁断刀(105)，所述两个第一裁断刀(105)分别设置为裁断所述第一极性带料(50)和所述第二极性带料(60)，以形成第一极性片(5)和第二极性片(6)；
    所述第一供料组件还包括四个第一放电机(106)，所述第一隔膜带料(10) 的两侧均设置一个第一放电机(106)，所述第二隔膜带料(20)的两侧均设置一个第一放电机(106)；所述第一放电机(106)设置为对所述第一隔膜带料(10)和所述第二隔膜带料(20)进行电晕处理；所述第一供料组件还包括四个第一纠偏器(107)，所述四个第一纠偏器(107)设置为分别对所述第一隔膜带料(10)、所述第二隔膜带料(20)、所述第一极性带料(50)和所述第二极性带料(60)进行纠偏操作
    所述第一热合组件置于所述第一供料组件的下游，设置为加热压合第一单元带料(70)，所述第一热合组件包括沿所述第一单元带料(70)的输送方向依次设置的第一预压辊(108)、第一加热件(109)和第一热压辊(1010)；所述第一预压辊(108)设置有两个，分别置于所述第一单元带料(70)的两侧，设置为对所述第一单元带料(70)内的所述第一隔膜带料(10)、所述第二隔膜带料(20)、所述第一极性片(5)和所述第二极性片(6)进行预压合；所述第一加热件(109)为加热板结构且设置有两个，两个加热板分别置于所述第一单元带料(70)的两侧，设置为加热所述第一单元带料(70)；所述第一热压辊(1010)设置有两个，分别置于所述第一单元带料(70)的两侧，设置为对所述第一单元带料(70)内的所述第一隔膜带料(10)、所述第二隔膜带料(20)、所述第一极性片(5)和所述第二极性片(6)进行压合，使得所述第一隔膜带料(10)、所述第二隔膜带料(20)、所述第一极性片(5)和所述第二极性片(6)形成整体带状；
    所述第一热合组件还包括两个第一聚对苯二甲酸乙二醇酯PET膜铺设组件；一个第一PET膜铺设组件设置在所述第一单元带料(70)上方，设置为为所述第一单元带料(70)铺设顶层的PET膜，另一个第一PET膜铺设组件设置在所述第一单元带料(70)下方，设置为为所述第一单元带料(70)铺设底层的PET膜；每个第一PET膜铺设组件包括一个第一PET膜放料辊(1011)和一个第一PET膜收料辊(1012)，所述第一PET膜放料辊(1011)置于所述第一预压辊(108)的上游，所述第一PET膜收料辊(1012)置于所述第一热压辊(1010)的下游；
    所述第一切断组件置于所述第一热合组件的下游，设置为切断所述第一单元带料(70)形成所述第一单元片(901)；所述第一切断组件包括第二裁断刀(1013)，设置为在沿所述第一隔膜带料(10)的长度方向上的相邻两个第一极性片(5)之间的间隙切断所述第一单元带料(70)，以形成所述第一单元片(901)；
    所述第一检测组件置于所述第一切断组件的下游，设置为对所述第一单元片(901)进行检测，所述第一检测组件包括设置为检测所述第一单元片(901) 的外观的第一外观检测件(1014)，以及设置为检测所述第一单元片(901)是否短路的第一短路检测件(1015)；
    所述第二供料组件包括第三隔膜带料辊(201)、第三极性带料辊(202)和第四隔膜带料辊(203)；所述第三隔膜带料辊(201)设置为供给第三隔膜带料(30)，所述第四隔膜带料辊(203)设置为供给第四隔膜带料(40)，所述第三极性带料辊(202)设置为供给所述第一极性带料(50)；所述第二供料组件还包括一个第三裁断刀(204)，所述第三裁断刀(204)设置为裁断所述第一极性带料(50)，以形成所述第一极性片(5)；所述第二供料组件还包括四个第二放电机(205)，所述第三隔膜带料(30)的两侧中的每侧设置一个第二放电机(205)，所述第四隔膜带料(40)的两侧中的每侧设置一个第二放电机(205)；所述第二放电机(205)设置为对所述第三隔膜带料(30)和所述第四隔膜带料(40)进行电晕处理；所述第二供料组件还包括三个第二纠偏器(206)，所述三个第二纠偏器(206)分别设置为对所述第三隔膜带料(30)、所述第四隔膜带料(40)和所述第一极性带料(50)进行纠偏操作；
    所述第二热合组件置于所述第二供料组件的下游，设置为加热压合第二单元带料(80)，所述第二热合组件包括沿所述第二单元带料(80)的输送方向依次设置的第二预压辊(207)、第二加热件(208)和第二热压辊(209)；所述第二预压辊(207)设置有两个，分别置于所述第二单元带料(80)的两侧，设置为对所述第二单元带料(80)内的所述第三隔膜带料(30)、所述第四隔膜带料(40)和所述第一极性片(5)进行预压合；所述第二加热件(208)为加热板结构且设置有两个，两个加热板分别置于所述第二单元带料(80)的两侧，设置为加热所述第二单元带料(80)；所述第二热压辊(209)设置有两个，分别置于所述第二单元带料(80)的两侧，设置为对所述第二单元带料(80)内的所述第三隔膜带料(30)、所述第四隔膜带料(40)和是第一极性片(5)进行压合，使得所述第三隔膜带料(30)、所述第四隔膜带料(40)和所述第一极性片(5)形成整体带状；
    所述第二热合组件还包括两个第二PET膜铺设组件；一个第二PET膜铺设组件设置在所述第二单元带料(80)上方，设置为为所述第二单元带料(80)铺设顶层的PET膜，另一个第二PET膜铺设组件设置在所述第二单元带料(80)下方，设置为为所述第二单元带料(80)铺设底层的PET膜；每个第二PET膜铺设组件均包括一个第二PET膜放料辊(2010)和一个第二PET膜收料辊(2011)，所述第二PET膜放料辊(2010)置于所述第二预压辊(207)的上游，所述第二PET膜收料辊(2011)置于第二热压辊(209)的下游；
    所述第二切断组件置于所述第二热合组件的下游，设置为切断所述第二单 元带料(80)形成所述第二单元片(902)；所述第二切断组件包括第四裁断刀(2012)，设置为在沿所述第三隔膜带料(30)的长度方向上的相邻两个第一极性片(5)之间的间隙切断所述第二单元带料(80)，以形成所述第二单元片(902)；
    所述第二检测组件置于所述第二切断组件的下游，设置为对所述第二单元片(902)进行检测，所述第二检测组件包括设置为检测所述第二单元片(902)的外观的第二外观检测件(2013)，以及设置为检测所述第二单元片(902)是否短路的第二短路检测件(2014)。
PCT/CN2022/076283 2021-03-31 2022-02-15 叠片方法、电芯及叠片系统 WO2022206195A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110352049.3 2021-03-31
CN202110352049.3A CN112909351A (zh) 2021-03-31 2021-03-31 一种叠片工艺

Publications (1)

Publication Number Publication Date
WO2022206195A1 true WO2022206195A1 (zh) 2022-10-06

Family

ID=76109789

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2022/076283 WO2022206195A1 (zh) 2021-03-31 2022-02-15 叠片方法、电芯及叠片系统

Country Status (2)

Country Link
CN (1) CN112909351A (zh)
WO (1) WO2022206195A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112909351A (zh) * 2021-03-31 2021-06-04 蜂巢能源科技有限公司 一种叠片工艺
CN114050320A (zh) * 2021-11-11 2022-02-15 合肥国轩高科动力能源有限公司 一种极片热复合系统和方法
CN114583284A (zh) * 2022-03-08 2022-06-03 蜂巢能源科技股份有限公司 一种叠片设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108808110A (zh) * 2017-04-28 2018-11-13 长城汽车股份有限公司 层叠式电芯及其制备方法和锂离子电池
CN110391449A (zh) * 2019-07-16 2019-10-29 蜂巢能源科技有限公司 模切叠片系统及方法
CN112201772A (zh) * 2020-10-19 2021-01-08 昆山聚创新能源科技有限公司 电芯加工方法
CN112382797A (zh) * 2020-07-17 2021-02-19 万向一二三股份公司 一种复合叠片的方法
CN112909351A (zh) * 2021-03-31 2021-06-04 蜂巢能源科技有限公司 一种叠片工艺

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PL2772978T3 (pl) * 2012-05-23 2019-06-28 Lg Chem, Ltd. Zespół elektrodowy i zawierające go urządzenie elektromechaniczne
KR101749148B1 (ko) * 2014-10-23 2017-06-20 주식회사 엘지화학 고주파 유도 가열을 이용한 라미네이션 장치 및 이를 이용하여 생산되는 이차전지
CN108598594A (zh) * 2018-04-25 2018-09-28 东莞阿李自动化股份有限公司 一种高效的叠片电芯生产工艺
CN109148967A (zh) * 2018-07-26 2019-01-04 深圳吉阳智能科技有限公司 组合式叠片电芯及其叠片单元和叠片方法
KR20200095896A (ko) * 2019-02-01 2020-08-11 주식회사 엘지화학 전극 조립체 제조방법과, 이를 통해 제조된 전극 및 이차전지
CN109935915B (zh) * 2019-04-17 2024-02-27 深圳吉阳智能科技有限公司 一种叠片式电芯成型系统
CN110911761B (zh) * 2019-12-05 2021-10-26 湖南新敏雅新能源科技有限公司 叠片电芯的制作方法和系统
CN111430774A (zh) * 2020-04-30 2020-07-17 蜂巢能源科技有限公司 电芯极组的快速叠片方法、叠片工装和电芯极组
CN112117494A (zh) * 2020-10-09 2020-12-22 昆山聚创新能源科技有限公司 层叠体及其叠片方法和应用

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108808110A (zh) * 2017-04-28 2018-11-13 长城汽车股份有限公司 层叠式电芯及其制备方法和锂离子电池
CN110391449A (zh) * 2019-07-16 2019-10-29 蜂巢能源科技有限公司 模切叠片系统及方法
CN112382797A (zh) * 2020-07-17 2021-02-19 万向一二三股份公司 一种复合叠片的方法
CN112201772A (zh) * 2020-10-19 2021-01-08 昆山聚创新能源科技有限公司 电芯加工方法
CN112909351A (zh) * 2021-03-31 2021-06-04 蜂巢能源科技有限公司 一种叠片工艺

Also Published As

Publication number Publication date
CN112909351A (zh) 2021-06-04

Similar Documents

Publication Publication Date Title
WO2022206195A1 (zh) 叠片方法、电芯及叠片系统
US10020541B2 (en) Laminating method
US8313606B2 (en) Method and apparatus for manufacturing wound electrode assembly for battery
EP4160805A1 (en) Lithium ion battery
WO2022179621A1 (zh) 电芯及叠片装置
JP6103220B2 (ja) マーキング装置、検査装置、及び電極製造方法
JP6210352B2 (ja) 電極ガイドを含むラミネーション装置
WO2018097606A1 (ko) 전극조립체 제조 장치 및 그 전극조립체 제조 장치에 의한 전극조립체 제조 방법
JP6481258B2 (ja) 電気デバイスのセパレータ接合方法、電気デバイスのセパレータ接合装置、および電気デバイス
EP4120410A1 (en) Unit cell manufacturing device and method
CN112117494A (zh) 层叠体及其叠片方法和应用
JP2016181345A (ja) 二次電池の製造方法
CN104838523A (zh) 电气装置的隔膜输送装置及其输送方法
WO2022120557A1 (zh) 膜电极的制造方法
CN112652802B (zh) 一种叠片装置
TWI645598B (zh) 鋰離子二次電池及鋰離子二次電池之製造方法
US20230369630A1 (en) Unit Cell Preparation Apparatus and Method
CN217740729U (zh) 电芯成型设备及电芯
WO2022170779A1 (zh) 复合装置及叠片机
WO2017197754A1 (zh) 分体压延分体复合补锂装置
JP2019153427A (ja) リチウムイオン二次電池の製造方法および製造装置
CN218333912U (zh) 一种复合正极的制袋式叠片电芯及其生产设备
CN220367974U (zh) 一种复合正极的制袋式叠片电芯及生产设备
CN112864471B (zh) 一种电芯成型方法
WO2022173004A1 (ja) リチウムイオン電池用部材の製造方法及び製造装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 22778380

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2301005819

Country of ref document: TH

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 22778380

Country of ref document: EP

Kind code of ref document: A1