WO2023000702A1 - 热复合叠片设备及热复合叠片方法 - Google Patents

热复合叠片设备及热复合叠片方法 Download PDF

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Publication number
WO2023000702A1
WO2023000702A1 PCT/CN2022/082795 CN2022082795W WO2023000702A1 WO 2023000702 A1 WO2023000702 A1 WO 2023000702A1 CN 2022082795 W CN2022082795 W CN 2022082795W WO 2023000702 A1 WO2023000702 A1 WO 2023000702A1
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WIPO (PCT)
Prior art keywords
sheet
polar
rolling
component
conveying
Prior art date
Application number
PCT/CN2022/082795
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English (en)
French (fr)
Inventor
赵凯
汪常
王晓
李昆芃
Original Assignee
蜂巢能源科技股份有限公司
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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
Priority to EP22844874.2A priority Critical patent/EP4376151A1/en
Publication of WO2023000702A1 publication Critical patent/WO2023000702A1/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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • 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
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or 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
    • 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 field of battery manufacturing equipment, for example, to a thermal lamination lamination equipment and a thermal lamination lamination method.
  • Lithium-ion batteries have the advantages of high energy density, wide operating temperature range, excellent cycle performance, and no toxic and harmful substances, and are widely used as power batteries for automobiles.
  • it is necessary to separate the opposite polarity sheets with separators, and use hot pressing to combine the polar sheets and separators together to form strips, and then combine the strips according to Z Type lamination technology stacked together.
  • the polar sheet and the diaphragm are heat-pressed together
  • the polar sheet is usually covered on the diaphragm (or the diaphragm is covered on the polar sheet), and then the overlapped polar sheet and diaphragm are heat-pressed.
  • the process of heating and pressing in order to ensure that the separator and the polar sheet can be well adhered together, it is necessary to ensure a sufficiently long heating length of the strip and a sufficiently large heating power. Large heating power It will lead to more heat loss, and the longer heating length of the strip will lead to insufficient compactness of the composite lamination equipment and low production efficiency.
  • the application proposes a heat-composite lamination equipment, which has less energy loss, compact structure and high production efficiency.
  • the present application proposes a thermal composite lamination method, which leads to less energy loss and high efficiency during the composite lamination process, and is conducive to the compact structure of the thermal composite lamination equipment.
  • a heat-composite lamination device comprising:
  • the main conveying mechanism is configured to convey the paired diaphragms along a preset trajectory, so that the paired diaphragms pass through the first rolling mechanism and the second rolling mechanism in sequence;
  • the first conveying mechanism is configured to feed the preheated first polar sheet with a preset size into the first rolling mechanism, and sandwich the first polar sheet between the paired between the diaphragms;
  • the heating conveying mechanism is arranged between the first rolling mechanism and the second rolling mechanism, and is configured to combine the paired separators and the first polar sheet into an intermediate composite;
  • the second conveying mechanism is configured to feed the preheated second polar sheet with a preset size into the second rolling mechanism, and make the second polar sheet positioned on the paired separators On the outside, the second rolling mechanism is configured to press-bond the second polarity sheet and the intermediate composite into a strip.
  • a thermal lamination method comprising:
  • the strip is folded so that the units of the strip are stacked sequentially, wherein the membrane segments are located at both ends of the units.
  • An electric core is manufactured by the above-mentioned heat-composite lamination method.
  • Fig. 1 is a schematic structural view of a heat-composite lamination equipment provided in an embodiment of the present application
  • Figure 2 is an enlarged view of A in Figure 1;
  • Fig. 3 is a partial schematic diagram of a stacking mechanism provided by an embodiment of the present application.
  • Fig. 4 is a flow chart of a heat-composite lamination method provided by an embodiment of the present application.
  • 6-heating conveying mechanism 61-conveyor belt; 62-heating element;
  • connection should be understood in a broad sense, for example, it can 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 intermediary, it can be the internal communication of two components or the interaction relationship between two components.
  • connection can 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 intermediary, it can be the internal communication of two components or the interaction relationship between two components.
  • a first feature being "on” or “under” a second feature may include that the first and second features are in direct contact, and may also include that the first and second features are not in direct contact. contact but through additional feature contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature.
  • "Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • thermocomposite lamination equipment includes a first rolling mechanism 1, a second rolling mechanism 2, a main conveying mechanism 3, a first conveying mechanism 4, a heating conveying mechanism 6, and a second conveying mechanism 5
  • the main conveying mechanism 3 can transport the paired diaphragm 300 along the preset trajectory, and the paired diaphragm 300 passes through the first rolling mechanism 1 and the second rolling mechanism 2 until it is located above the stacking mechanism 7,
  • the first conveying mechanism 4 can feed the preheated first polar sheet 100 with a preset size into the first rolling mechanism 1 , and sandwich the first polar sheet 100 between the paired separators 300
  • the heating and conveying mechanism 6 can composite the separator 300 and the first polar sheet 100 into an intermediate composite 400, and the second conveying mechanism 5
  • the second conveying mechanism 5 The second conveying mechanism 5
  • the material tape 500 includes diaphragm segments 501 and unit pieces 502 arranged alternately.
  • the inner side of the diaphragm 300 refers to the side of the paired diaphragm 300 facing each other, and the outer side of the diaphragm 300 refers to the side of the diaphragm 300 facing away from the other diaphragm 300 .
  • Both sides of the diaphragm 300 are coated with a glue layer. When the diaphragm 300 is heated, the viscosity of the glue layer is greatly increased by heating, so that the first polar sheet 100 and the second polar sheet 200 can be adhered.
  • the first polar sheet 100 before the first polar sheet 100 is sent into the first rolling mechanism 1, the first polar sheet 100 is preheated, then when the first polar sheet 100 and After the diaphragm 300 contacts, the first polar plate 100 starts to heat the glue layer inside the diaphragm 300.
  • the heating and conveying mechanism 6 assists in heating the diaphragm 300 from the outside of the diaphragm 300, so that The diaphragm 300 can become hot and viscous more rapidly, thereby shortening the length of the heating and conveying mechanism 6, reducing the heating power required by the heating and conveying mechanism 6, making the overall structure of the thermal composite lamination equipment more compact and higher in production efficiency;
  • the bipolar sheet 200 is also preheated before entering the second rolling mechanism 2, and the second polar sheet 200 can heat the diaphragm 300 on the basis of heating the glue layer on the outside of the diaphragm 300 by the heating and conveying mechanism 6.
  • the intermediate composite body 400 and the second polar sheet 200 can be directly compounded into the material strip 500 at the second rolling mechanism 2, so the second rolling mechanism 2 does not need to be provided with a heating structure, thereby ensuring thermal lamination
  • the overall structure of the equipment is compact; in addition, the preheated first polar plate 100 heats the separator 300 from the inside to the outside, and the power reduction of the intermediate composite 400 during the hot pressing process is beneficial to reduce the overall hot pressing heat loss in the process.
  • the heating temperature is 40-150 degrees Celsius.
  • the hot-pressing plate needs to be high-temperature-resistant and processed from materials that are not easy to deform at high temperatures and have a high ignition point.
  • the heating time from room temperature to working temperature is 5-30 minutes.
  • the first polar sheet 100 is a negative electrode sheet
  • the second polar sheet 200 is a positive electrode sheet
  • the material tape 500 pressed by the second rolling mechanism 2 is Z
  • the shape is folded to form a stack.
  • the dies 502 are stacked sequentially from top to bottom, and the diaphragm segments 501 are located at both ends of the dies 502 and connect two adjacent dies 502 up and down.
  • the battery is a lithium iron phosphate battery or a ternary battery or a cobalt-free battery, the battery needs to ensure that the negative pole piece covers the positive pole piece.
  • the unit piece 502 includes two types, and the first type of unit piece 5021 only includes A pair of diaphragms 300 and a first polar sheet 100 sandwiched between the pair of diaphragms 300, the second type of unit sheet 5022 includes the second polar sheet 200, the diaphragm 300, the first polar sheet 100, the diaphragm 300 (or sequentially include the separator 300, the first polar sheet 100, the separator 300, and the second polar sheet 200), the first type of unit sheet 5021 is arranged on the uppermost or lowermost layer of the entire stack, thereby ensuring that the entire stack is A structure in which the negative electrode wraps the positive electrode.
  • the first polarity sheet 100 may also be a positive electrode sheet
  • the second polarity sheet 200 may be a negative electrode sheet, which can be flexibly selected according to the specific type of the battery.
  • Adjacent polarity sheets with opposite polarities have different surrounding dimensions. 0.5-5mm, and the width of the diaphragm in the tape running direction is 1-10mm larger than the width of the pole piece.
  • the thermal compound lamination equipment includes two sets of first conveying mechanisms 4 , and the two sets of first conveying mechanisms 4 can alternately feed the first polar sheet 100 into the first conveying mechanisms 4 .
  • first conveying mechanisms 4 When one set of first conveying mechanisms 4 is in the process of heating and cutting the first polar sheet 100 to a preset size, another set of first conveying mechanisms 4 can preheat and cut the first polar sheet 100 to a preset size.
  • the first polar sheet 100 is transported into the first rolling mechanism 1, thereby greatly improving the working efficiency of the thermal lamination lamination equipment.
  • the structures of the two sets of first transporting mechanisms 4 are completely the same.
  • the thermal composite lamination equipment includes two sets of second conveying mechanisms 5, and the two sets of second conveying mechanisms 5 are arranged on both sides of the intermediate composite body 400, and can alternately feed the second polar sheet 200 into the second conveying mechanisms 5, and
  • the second polar sheets 200 delivered by the two second delivery mechanisms 5 are respectively located outside the two separators 300 .
  • the second polarity sheets 200 are discontinuously distributed on both surfaces of the intermediate composite body 400
  • the second polarity sheets 200 are distributed asymmetrically on both sides of the intermediate composite body 400 .
  • the "one positive and one reverse alternate arrangement" of the second type of unit sheet 5022 means that the second polarity sheet 200 of a second type of unit sheet 5022 is located on the upper side (that is, from top to bottom: the second polarity sheet 200, Diaphragm 300, first polar sheet 100, diaphragm 300), then the second polar sheet 200 of the second type unit sheet 5022 adjacent to it is located on the lower side (that is, from top to bottom: diaphragm 300, first pole polarity sheet 100, separator 300, and second polarity sheet 200), the rolling pressure is 100-1200kg, the roller diameter is greater than 80mm and less than 350mm, and the surface of the pressing roller needs to be treated with anti-sticking coating.
  • the main conveying mechanism 3 includes a membrane discharge roller arranged upstream of the first rolling mechanism 1 and a driving roller (not shown) arranged downstream of the second rolling mechanism 2, and the driving roller and the membrane discharging roller work together to realize The diaphragm 300 (including the intermediate complex 400 formed by the diaphragm 300 and the material belt 500 ) is driven to move along a preset track.
  • the main conveying mechanism 3 includes two diaphragm discharge rollers, the two diaphragm discharge rollers are located on both sides of the first polar sheet 100 respectively, and each diaphragm discharge roller corresponds to conveying one diaphragm.
  • the heating conveyor mechanism 6 includes two conveyor belts 61 respectively arranged on both sides of the paired diaphragm 300.
  • the two conveyor belts 61 rotate in opposite directions to assist in driving the movement of the diaphragm 300.
  • the conveyor belt 61 is provided with a heating element 62 for heating.
  • the element 62 can realize the heating of the diaphragm 300 , and the heating element 62 can be any one of related technologies, which is not limited here.
  • the first conveying mechanism 4 includes a first conveying roller 41, a first heating assembly 42, a first cutting assembly 43 and a first manipulator, and the first conveying roller 41 is set to continuously
  • the first polar sheet 100 is transported to the first cutting assembly 43, the first cutting assembly 43 is configured to cut the first polar sheet 100 to a preset size, and the first manipulator is configured to cut the first polar sheet 100 of the preset size
  • the polar sheet 100 is sent into the first rolling mechanism 1
  • the first heating assembly 42 is arranged between the first conveying roller 41 and the first cutting assembly 43 and is configured to heat at least one side of the first polar sheet 100, thereby
  • the first conveying mechanism 4 conveys the preheated first polar sheet 100 with a preset size into the first rolling mechanism 1 .
  • the upstream position of the first cutting assembly 43 is provided with a first clamping assembly, the first clamping assembly can clamp the first polar sheet 100, so as to cooperate with the first conveying roller 41 to carry out the first polar sheet 100 transport, and can ensure that the position of the first polar sheet 100 is stable during the cutting process of the first cutting assembly 43 .
  • the second conveying mechanism 5 includes a second conveying roller 51, a second heating assembly 52, a second cutting assembly 53 and a second manipulator, and the second conveying roller 51 is configured to convey the continuous second polar sheet 200 to At the second cutting assembly 53, the second cutting assembly 53 is configured to cut the second polar sheet 200 into a preset size, and the second manipulator is configured to send the second polar sheet 200 of the preset size into the second roller
  • the second heating assembly 52 is arranged between the second conveying roller 51 and the second cutting assembly 53 and is arranged to heat at least one side of the second polar sheet 200, so as to realize the second conveying mechanism 5 to the first
  • the second polarity sheet 200 with a pre-heated and preset size is conveyed in the second rolling mechanism 2 .
  • the upstream of the second cutting assembly 53 is provided with a second clamping assembly, the second clamping assembly can clamp the second polar sheet 200, so as to cooperate with the second conveying roller 51 to transport the second polar sheet 200 , and can ensure that the position of the second polarity sheet 200 is stable during the cutting process of the second cutting assembly 53 .
  • the first heating assembly 42 includes two heating plates, and the two heating plates are respectively located on both sides of the first polar sheet 100, so that both sides of the first polar sheet 100 can be heated evenly, so that the first polar sheet 100
  • the two diaphragms 300 can be heated separately.
  • the second heating assembly 52 includes two heating plates, and the two heating plates are respectively located on both sides of the second polar sheet 200, so that the second polar sheet 200 can quickly reach the preset temperature and improve the heating efficiency. , also makes the structure of the second conveying mechanism 5 more compact.
  • the first conveying mechanism 4 also includes a first defect detection component 44, a first marking component 46, a first identification component 47 and a first grasping mechanism, and the first defect detection component 44 can detect defects on the continuous first polarity sheet 100 , the first marking assembly 46 can mark the defects on the first polarity sheet 100, and the first identification assembly 47 can identify the mark on the first polarity sheet 100, and make the first grabbing mechanism in the first cutting After the component 43 cuts the first polar piece 100, it takes away the first polar piece 100 with the mark, that is, before the first polar piece 100 and the separator 300 are combined, the first polar piece 100 with defects is rejected .
  • the first defect detection assembly 44 includes two detection parts, and the two detection parts are respectively located on both sides of the first polarity sheet 100 to detect both sides of the first polarity sheet 100 respectively to ensure that the first polarity sheet 100 No defects on either side.
  • the first marking component 46 can be an inkjet component, a marking component, etc., to mark the defect position of the first polarity sheet 100.
  • the first identification component 47 can be a color mark recognition sensor, which can identify the first polarity Whether there is a mark made by the first marking component 46 on the polarity sheet 100 to judge whether the first polarity sheet 100 is defective, when the first identification component 47 recognizes the mark, the first cutting component 43 first cuts the first polarity The sheet 100 is cut, and the defective first polar sheet 100 is taken away by the first grabbing component and placed in the waste recycling position.
  • the defect detection component needs to be illuminated with positive light, and the defect detection camera is 300-1600mm away from the detection position. In one embodiment, the camera pixels range from 4k to 32k.
  • the first marking component 46 is disposed upstream of the first heating component 42
  • the first identifying component 47 is disposed downstream of the first heating component 42 and upstream of the first cutting component 43 .
  • the first conveying mechanism 4 includes two first marking assemblies 46, and the two first marking assemblies 46 are respectively located on both sides of the first polar sheet 100, so as to respectively mark defects on both sides.
  • the first conveying mechanism 4 also includes two first identification components 47, and the two first identification components 47 are respectively located on both sides of the first polarity sheet 100, so as to identify the marks of the two first marking components 46 correspondingly.
  • the first conveying mechanism 4 may not be provided with a first grasping component, and the removal process of the defective first polarity sheet 100 may be realized by the first manipulator.
  • the second conveying mechanism 5 also includes a second defect detection component 54, a second marking component 56, a second identification component 57 and a second grasping mechanism, and the second defect detection component 54 can detect the continuous second polarity sheet 200, the second marking assembly 56 can mark the defects on the second polarity sheet 200, and the second identification assembly 57 can identify the mark on the second polarity sheet 200, and make the second grabbing mechanism
  • the second cutting component 53 cuts the second polarity sheet 200 and takes away the second polarity sheet 200 with the mark. That is, before the second polar sheet 200 and the separator 300 are combined, the defective second polar sheet 200 is removed.
  • the second defect detection assembly 54 includes two detection parts, and the two detection parts are respectively located on both sides of the second polarity sheet 200 to detect both sides of the second polarity sheet 200 respectively to ensure that the second polarity sheet 200 No defects on either side.
  • the second marking component 56 can be an inkjet component, a marking component, etc., to mark the defect position of the second polarity sheet 200.
  • the second identification component 57 can be a color mark sensor, which can identify Whether there is a mark made by the second marking assembly 56 on the sheet 200 to judge whether the second polar sheet 200 is defective, when the second identification assembly 57 recognizes the mark, the second cutting assembly 53 first cuts the second polar sheet 200 cutting, and the second grabbing component takes the defective second polarity sheet 200 away to the waste recycling position.
  • the second marking component 56 is disposed upstream of the second heating component 52
  • the second identifying component 57 is disposed downstream of the second heating component 52 and upstream of the second cutting component 53 .
  • the second conveying mechanism 5 includes two second marking assemblies 56, and the two second marking assemblies 56 are respectively located on both sides of the second polarity sheet 200, so as to respectively mark the defects on both sides.
  • the second conveying mechanism 5 also includes two second identification components 57, the two second identification components 57 are respectively located on both sides of the second polarity sheet 200, so as to identify the marks of the two second marking components 56 correspondingly.
  • the second conveying mechanism 5 may not be provided with a second grasping component, and the removal process of the defective second polarity sheet 200 may be realized by the second manipulator.
  • the first deviation correction assembly 45 is provided on the first conveying mechanism 4, and the first deviation correction assembly 45 can correct the position of the first polar sheet 100 to prevent the continuous first polar sheet 100 from occurring during the conveying process. Skew of position.
  • the second deflection correction assembly 55 is provided on the second conveying mechanism 5 , and the second deflection correction assembly 55 can correct the position of the second polarity sheet 200 to prevent the position deviation of the continuous second polarity sheet 200 during the conveying process.
  • the first deflection correcting component 45 and the second deflection correcting component 55 can be any one of related technologies, which is not limited here.
  • the first rolling mechanism 1 includes two relatively rotatable first pressing rollers 11 , and the diaphragm 300 passes between the two first pressing rollers 11 .
  • the thermal composite lamination equipment also includes a rolling dust sticking mechanism 10 , which is configured to clean the first pressure roller 11 .
  • the first pressure roller 11 can adhere to the dust on the surface of the diaphragm 300, and the dust sticking mechanism 10 can adhere to the dust on the first pressure roller 11, thereby ensuring the cleanliness of the diaphragm 300, and then it is unnecessary to set polyethylene terephthalate.
  • PET Polyethylene glycol terephthalate
  • the rolling dust sticking mechanism 10 includes a primary dust sticking roller 101 and a secondary dust sticking roller 102, and the primary dust sticking roller 101 is a soft dust sticking roller, such as soft silica gel, sticky dust The effect is good, but the viscosity is low.
  • the primary dust-adhesive roller 101 abuts against the first pressure roller 11 and rotates in the opposite direction.
  • the linear speed of the primary dust-adhesive roller 101 and the first pressure roller 11 is the same or there is a small speed difference , so as to stick the dust on the first pressure roller 11 to the primary dust-sticking roller 101;
  • the secondary dust-sticking roller 102 is a hard dust-sticking roller, and the secondary dust-sticking roller 102 is wrapped with dozens of layers of high-viscosity dust-sticking paper,
  • the secondary dust-sticking roller 102 abuts against the primary dust-sticking roller 101 and rotates in the opposite direction, thereby sticking the dust on the primary dust-sticking roller 101 to the dust-sticking paper. Dust paper is enough, the dust removal effect is good, and the operation is convenient.
  • the second rolling mechanism 2 includes two relatively rotatable second pressing rollers 21, the second polar sheet 200 and the intermediate composite 400 pass between the two second pressing rollers 21, the second A rolling dust sticking mechanism 10 is also provided at the pressing roller 21 , and the rolling dust sticking mechanism 10 can clean the second pressing roller 21 .
  • the second pressing roller 21 can adhere to the dust on the surface of the second polar sheet 200 and the debris attached to the second polar sheet 200 when the second polar sheet 200 is cut, and the rolling dust sticking mechanism 10 can adhere to the second polar sheet 200. Dust and debris on the second pressure roller 21 can ensure the cleanliness of the second polar sheet 200, and it is not necessary to provide PET film, which simplifies the structure of the thermal lamination lamination equipment.
  • the structure and working principle of the rolling dust sticking mechanism 10 at the second press roller 21 and the rolling dust sticking mechanism 10 at the first press roller 11 are the same, and will not be repeated here.
  • the stacking mechanism 7 includes a material box 71 and an air blowing assembly 72, the upper end of the material box 71 is provided with an opening, and the main conveying mechanism 3 drives the material belt 500 to enter the material from the opening of the material box 71 vertically.
  • Box 71, the air blowing assembly 72 is arranged on one side of the magazine 71, as shown in Figure 3, when the end of the material tape 500 enters the upper end of the magazine 71, the air blowing assembly 72 blows to the other side of the magazine 71.
  • the material tape 500 falls freely and realizes Z-shaped folding, so that the unit pieces 502 are stacked in the magazine 71 in sequence, and when the unit pieces 502 are stacked to the preset number, the material belt 500 can be cut.
  • the magazine 71 filled with unit chips 502 leaves the bottom of the material belt 500, and the empty magazine 71 moves to the bottom of the material belt 500, thereby ensuring the continuous lamination process, reducing waiting time and improving production efficiency.
  • the stacking mechanism 7 also includes a reflective mirror 73 and a position detection assembly 74
  • the reflective mirror 73 is arranged on the upper side of the material box 71 and is positioned at both sides of the material belt 500
  • the position detection assembly 74 can emit a detection light source to detect The light source is reflected by the reflective mirror 73 and irradiates on the unit chip 502.
  • the position detection component 74 can detect the position of the edge of the unit chip 502, thereby judging whether the problem of deflection occurs in the unit chip 502.
  • the position detection component can be flexibly set 74, to avoid positional interference between the position detection component 74 and the material strip 500 before stacking, and to ensure the accuracy of detection.
  • the position detection assembly 74 can be a charge-coupled device (Charge-coupled Device, CCD) camera or a position sensor, and the position detection assembly 74 can send out a detection light source in the horizontal direction, and the mirror 73 is inclined at an angle of 45°, so that The detection light source is vertically irradiated on the unit chip 502.
  • the inclination angle of the mirror 73 can be flexibly adjusted according to the actual placement position of the detection component and the direction of the detection light source, which is not limited here.
  • the heat-composite lamination equipment further includes a rejecting mechanism configured to reject die 502 with defects.
  • the rejecting mechanism includes a third defect detection component 81, a diaphragm cutting component and a reject component 82.
  • the third defect detection component 81 is arranged between the second rolling mechanism 2 and the stacking mechanism 7.
  • the third defect detection component 81 can detect For the defect of the unit piece 502, the diaphragm cutting assembly is arranged on the upper side of the magazine 71.
  • the diaphragm cutting assembly can cut off the diaphragm segment 501 downstream of the unit piece 502 with the defect, and the reject assembly 82 can cut off the section upstream of the unit piece 502 with the defect.
  • the diaphragm segment 501 drives the defective unit piece 502 away from the magazine 71 , thereby preventing the defective unit piece 502 from being stacked into the magazine 71 .
  • the third defect detection component 81 includes a panoramic detection part 811 and a short circuit detection part 812.
  • the panoramic detection part 811 is set to detect defects such as the shape and position accuracy of the cell 502, and the short circuit detection part 812 detects whether there is a short circuit problem in the cell 502. As long as the panoramic If any one of the detection part 811 and the short circuit detection part 812 is unqualified, the die 502 is marked as a defective die 502 .
  • the diaphragm cutting assembly is a telescopic structure. When not in use, the diaphragm cutting assembly retracts and leaves the top of the material box 71 to avoid the material belt 500. When in use, the diaphragm cutting structure stretches out to the top of the material box 71 and closes the diaphragm. Segment 501 is trimmed.
  • the reject assembly 82 includes a retractable stage and a cutting assembly arranged on the stage. When it is necessary to reject the defective unit piece 502, and after the diaphragm cutting assembly cuts off the diaphragm segment 501 downstream of the unit piece 502, the stage extends out. To the bottom of the defective die 502 , the cutting assembly cuts off the diaphragm segment 501 upstream of the defective die 502 . At this time, the defective die 502 falls on the stage, and the stage retracts to remove the defective die 502 .
  • the number of stacked layers of the stacked body finally formed in the magazine 71 is predetermined, and the arrangement order of the first type of die 5021 and the second type of die 5022 on the tape 500 is also corresponding, when there is a defective die 502 After being rejected, if the material tape 500 continues to be stacked directly into the material box 71 , it cannot be guaranteed that the final stacked body has a structure in which the negative electrode covers the positive electrode.
  • the heat-composite lamination equipment also includes a patch mechanism 9 , which can supplement the prepared unit sheets 502 into the magazine 71 . After the defective die 502 is rejected, corresponding dies 502 of the same type as the rejected defective die 502 can be replenished into the magazine 71 , so as to ensure that the subsequent stacking of the tape 500 can proceed smoothly.
  • the patch mechanism 9 includes a feeding clip 91, an alignment platform 92 and a patch manipulator, the feeding clip 91 is provided with a unit piece 502, and the patch manipulator can grab the unit piece 502 from the feeding clip 91 and place it On the alignment platform 92, the alignment platform 92 can identify the location of the unit piece 502, and then the patch manipulator grabs the positioned unit piece 502 on the alignment platform 92 and adjusts the posture of the unit piece 502 before putting it into the magazine 71 Within, the placement accuracy of the die 502 is ensured.
  • the patch mechanism 9 includes two feeding clips 91, wherein a first type of unit piece 5021 is placed in one of the feeding clips 91, and a second type of unit piece is placed in the other filling clip 91. 5022 , when the defective unit piece 502 on the material tape 500 is removed, the patch manipulator grabs the unit piece 502 of the same type as the removed unit piece 502 from the corresponding magazine 71 to replenish.
  • this embodiment also provides a method for thermally laminating laminated sheets, including:
  • a preheated first polar sheet 100 with a preset size provide a pair of separators 300, and make the paired separators 300 respectively located on both sides of the first polar sheet 100; heat the separator 300 and The separator 300 and the first polar sheet 100 are combined into an intermediate composite body 400; a second polar sheet 200 with preheating treatment and a preset size is provided to one side of the intermediate composite body 400; the second polar sheet 200 and the middle
  • the composite body 400 is pressed into a strip 500, which has diaphragm segments 501 and unit pieces 502 arranged alternately;
  • the first polar sheet 100 is preheated before the separator 300 and the first polar sheet 100 are thermally combined, and the intermediate composite 400 and the second polar sheet 200 are pressed.
  • the second polar sheet 200 is preheated, it is possible to reduce the hot pressing length and heating power in the step of hot pressing the intermediate composite 400, making the thermal lamination equipment more compact; in addition, after preheating
  • the heat-treated first polar sheet 100 heats the separator 300 from the inside to the outside, and the power reduction of the intermediate composite body 400 during the hot-pressing process is beneficial to reduce the heat loss during the whole hot-pressing lamination process.
  • Thermal lamination method further comprising:
  • the die 502 is additionally placed on top of the already stacked die 502 .
  • the prepared complete die 502 should also include the first-type die 5021 and the second-type die 5022. Two, through the elimination of defective unit chips 502 and the supplementation of intact unit chips 502, it is ensured that the stacking order of the first type of unit chips 5021 and the second type of unit chips 5022 in the finally formed stack remains unchanged, thereby ensuring that the formed
  • the stacked body can be a structure in which the negative electrode covers the positive electrode.
  • This embodiment also provides an electric core, which is manufactured by the above-mentioned heat-composite stacking method.
  • the electric core includes two layers of continuous diaphragms arranged oppositely, and a plurality of first polar plates 100 arranged at intervals are sandwiched between the two layers of continuous diaphragms, so as to form a plurality of intermediate polar plates 100 arranged at intervals on the continuous diaphragm.
  • Composite body 400, the second polar sheet 200 is discontinuously distributed on the first surface or the second surface of the intermediate composite body 400, and the second polar sheet 200 is on the first surface and the second surface of the intermediate composite body 400 It is asymmetrically distributed, and the battery core is obtained by sequentially performing Z-folding with the intermediate complex 400 as a unit.

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Abstract

本文公开了一种热复合叠片设备及热复合叠片方法。该设备包括第一辊压机构、第二辊压机构、主输送机构、第一输送机构、加热输送机构及第二输送机构；主输送机构设置为沿预设轨迹输送成对的隔膜以使成对的隔膜依次经过第一辊压机构和第二辊压机构；第一输送机构设置为向第一辊压机构内送入经预热处理且具有预设尺寸的第一极性片并使第一极性片夹设于成对的隔膜之间；加热输送机构设置在第一辊压机构和第二辊压机构之间，设置为将成对的隔膜和第一极性片复合为中间复合体；第二输送机构设置为向第二辊压机构内送入经预热处理且具有预设尺寸的第二极性片，并使第二极性片位于成对的隔膜外侧，第二辊压机构设置为将第二极性片和中间复合体压合为料带。

Description

热复合叠片设备及热复合叠片方法
本申请要求在2021年07月23日提交中国专利局、申请号为202110839242.X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
本申请涉及电池制造设备领域，例如涉及一种热复合叠片设备及热复合叠片方法。
背景技术
锂离子电池具有能量密度大、工作温度范围宽、循环性能优越、不含有毒有害物质等优点，被广泛应用为汽车的动力电池。锂离子电池在制造过程中，需要将采用隔膜分隔开异性的极性片，并采用热压的方式将极性片和隔膜复合在一起形成料带，接着将复合在一起的料带按照Z型叠片技术堆叠在一起。
相关技术中，在将极性片与隔膜热压在一起时，通常先将极性片覆盖在隔膜上(或将隔膜覆盖于极性片上)，再将重叠后的极性片和隔膜加热压合在一起，这种方式中，在加热压合过程中，为了保证隔膜和极性片能良好地粘附在一起，需要保证足够长的料带加热长度和足够大的加热功率，大加热功率会导致较多的热量损失，较长的料带加热长度会导致复合叠片设备体积不够紧凑、生产效率低。
发明内容
本申请提出一种热复合叠片设备，使得能量损失少、结构紧凑且生产效率高。
本申请提出一种热复合叠片方法，使得在复合叠片过程中能量损失少、效率高，且有利于热复合叠片设备的结构紧凑。
一种热复合叠片设备，包括：
第一辊压机构；
第二辊压机构；
主输送机构，设置为沿预设轨迹输送成对的隔膜，以使所述成对的隔膜依次经过所述第一辊压机构和所述第二辊压机构；
第一输送机构，设置为向所述第一辊压机构内送入经预热处理且具有预设 尺寸的第一极性片，并使所述第一极性片夹设于所述成对的隔膜之间；
加热输送机构，设置在所述第一辊压机构和所述第二辊压机构之间，设置为将所述成对的隔膜和所述第一极性片复合为中间复合体；
第二输送机构，设置为向所述第二辊压机构内送入经预热处理且具有预设尺寸的第二极性片，并使所述第二极性片位于所述成对的隔膜外侧，所述第二辊压机构设置为将所述第二极性片和所述中间复合体压合为料带。
一种热复合叠片方法，包括：
提供经过预热处理且具有预设尺寸的第一极性片；
提供成对的隔膜，并使所述成对的隔膜分别位于所述第一极性片的两侧；
对所述成对的隔膜加热并将所述成对的隔膜和所述第一极性片复合为中间复合体；
向所述中间复合体的一侧提供预热处理并具有预设尺寸的第二极性片；
将所述第二极性片和所述中间复合体压合为料带，其中，所述料带具有交替设置的隔膜段和单元片；
折叠所述料带，使所述料带的单元片依次堆叠，其中，所述隔膜段位于所述单元片的两端。
一种电芯，通过上述的热复合叠片方法制造而成。
附图说明
图1是本申请实施例提供的一种热复合叠片设备的结构示意图；
图2是图1中的A处放大图；
图3是本申请实施例提供的一种叠片机构的局部示意图；
图4是本申请实施例提供的一种热复合叠片方法的流程图。
图中：
100-第一极性片；200-第二极性片；300-隔膜；400-中间复合体；500-料带；501-隔膜段；502-单元片；5021-第一种单元片；5022-第二种单元片；
1-第一辊压机构；11-第一压辊；
2-第二辊压机构；21-第二压辊；
3-主输送机构；
4-第一输送机构；41-第一输送辊；42-第一加热组件；43-第一裁切组件；44- 第一缺陷检测组件；45-第一纠偏组件；46-第一标记组件；47-第一识别组件；
5-第二输送机构；51-第二输送辊；52-第二加热组件；53-第二裁切组件；54-第二缺陷检测组件；55-第二纠偏组件；56-第二标记组件；57-第二识别组件；
6-加热输送机构；61-传送带；62-加热件；
7-叠片机构；71-料盒；72-吹气组件；73-反光镜；74-位置检测组件；
81-第三缺陷检测组件；811-全景检测件；812-短路检测件；82-剔废组件；
9-补片机构；91-补料弹夹；92-对位平台；
10-辊压粘尘机构；101-一次粘尘辊；102-二次粘尘辊。
具体实施方式
下面结合附图和实施例对本申请进行说明。此处所描述的具体实施例仅用于解释本申请。为了便于描述，附图中仅示出了与本申请相关的部分。
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。
在本实施例的描述中，术语“上”、“下”、“右”、等方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述和简化操作，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，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
本实施例提供了一种热复合叠片设备，其可应用于锂离子电池生产过程中。如图1和图2所示，热复合叠片设备包括第一辊压机构1、第二辊压机构2、主输送机构3、第一输送机构4、加热输送机构6、第二输送机构5及叠片机构7， 主输送机构3能够沿预设轨迹输送成对的隔膜300，成对的隔膜300依次经过第一辊压机构1、第二辊压机构2直至位于叠片机构7上方，第一输送机构4能够向第一辊压机构1内送入经预热处理且具有预设尺寸的第一极性片100，并使第一极性片100夹设于成对的隔膜300之间，加热输送机构6设置在第一辊压机构1和第二辊压机构2之间，加热输送机构6能将隔膜300和第一极性片100复合为中间复合体400，第二输送机构5能够向第二辊压机构2内送入经预热处理且具有预设尺寸的第二极性片200，并使第二极性片200位于隔膜300外侧，第二辊压机构2将第二极性片200和中间复合体400压合为料带500。其中，料带500包括交替设置的隔膜段501和单元片502。本实施例中，隔膜300的内侧表示成对的隔膜300朝向彼此的一侧，隔膜300的外侧表示隔膜300背离另一个隔膜300的一侧。隔膜300的两侧涂布有胶水层，当对隔膜300加热时，胶水层受热粘性大大增加，从而可以粘附第一极性片100和第二极性片200。
本实施例的热复合叠片设备，在将第一极性片100送入第一辊压机构1之前，先对第一极性片100进行预热处理，则当第一极性片100与隔膜300接触后第一极性片100即开始对隔膜300内侧的胶水层进行加热，当隔膜300到达加热输送机构6处时，加热输送机构6再辅助从隔膜300外侧对隔膜300进行加热，使隔膜300能更加快速地变热变粘，从而缩短加热输送机构6的长度、减小加热输送机构6所需要的加热功率，使热复合叠片设备的整体结构更加紧凑、生产效率更高；第二极性片200在进入第二辊压机构2之前也先进行预热处理，在加热输送机构6对隔膜300外侧的胶水层加热的基础上，第二极性片200能对隔膜300进行加热，从而使中间复合体400和第二极性片200可以在第二辊压机构2处直接复合成为料带500，故第二辊压机构2后续不必再设置加热结构，从而保证热复合叠片设备整体结构的紧凑性；此外，经预热处理后的第一极性片100从内向外对隔膜300进行加热、中间复合体400热压过程的功率减小等均有利于降低整个热压复合过程中的热量损失。其中，加热温度为40～150摄氏度，热压板需耐高温且由高温下不易变形、燃点高的材质加工而成，常温到工作温度的升温时间为5～30分钟。
本实施例中，如图1和图2所示，第一极性片100为负极片，第二极性片200为正极片，经第二辊压机构2压合好的料带500以Z型进行折叠形成堆叠体。其中，单元片502从上至下依次堆叠，隔膜段501位于单元片502的两端并连接上下相邻的两个单元片502。当电池为磷酸铁锂电池或三元电池或无钴电池时，电芯需要保证负极极片包覆正极极片，本实施例中，单元片502包括两种，第一种单元片5021仅包括成对的隔膜300和夹设在成对的隔膜300之间的第一极性片100，第二种单元片5022依次包括第二极性片200、隔膜300、第一极性片100、隔膜300(或者依次包括隔膜300、第一极性片100、隔膜300、第二极 性片200)，第一种单元片5021设置在整个堆叠体的最上层或最下层，从而保证整个堆叠体为负极包覆正极的结构。其他实施例中，也可以是第一极性片100为正极片，第二极性片200为负极片，根据电池的具体种类灵活选择即可，相邻极性相反的极片，四周尺寸差为0.5～5mm，隔膜在走带方向的宽度大于极片宽度1～10mm。
热复合叠片设备包括两组第一输送机构4，两组第一输送机构4能交替向第一输送机构4内送入第一极性片100。当一组第一输送机构4在对第一极性片100进行加热、裁切为预设尺寸的过程中，另一组第一输送机构4可以将已预热处理并裁切为预设尺寸的第一极性片100输送至第一辊压机构1内，从而能够大大提高热复合叠片设备的工作效率，本实施例中，两组第一输送机构4的结构完全相同。热复合叠片设备包括两组第二输送机构5，两组第二输送机构5设置在中间复合体400的两侧，并能交替向第二输送机构5送入第二极性片200，且两个第二输送机构5输送的第二极性片200分别位于两个隔膜300的外侧。本实施例中，第二极性片200在中间复合体400的两个表面上均不连续分布，且第二极性片200在中间复合体400的两侧不对称分布。一方面，当一组第二输送机构5在对第二极性片200进行加热、裁切为预设尺寸的过程中，另一组第二输送机构5可以将已预热处理并裁切为预设尺寸的第二极性片200输送至第二辊压机构2内，从而能够大大提高热复合叠片设备的工作效率；另一方面，两个第二输送机构5分别向中间复合体400的两侧输送第二极性片200，进而使形成的第二种单元片5022的朝向一正一反交替设置，最终保证料带500经Z型折叠后，所有的第二单元片502朝向一致。第二种单元片5022的“一正一反交替设置”表示，一个第二种单元片5022的第二极性片200位于上侧(即从上至下依次为：第二极性片200、隔膜300、第一极性片100、隔膜300)，则与其相邻的第二种单元片5022的第二极性片200位于下侧(即从上至下依次为：隔膜300、第一极性片100、隔膜300、第二极性片200)，辊压压力为100～1200kg，压辊辊径大于80mm且小于350mm，压辊表面需进行防粘涂层处理。
主输送机构3包括设置在第一辊压机构1上游的隔膜放料辊和设置在第二辊压机构2下游的驱动辊(未图示)，驱动辊和隔膜放料辊共同作用，从而实现驱动隔膜300(包括隔膜300形成的中间复合体400、料带500)沿预设轨迹运动。主输送机构3包括两个隔膜放料辊，两个隔膜放料辊分别位于第一极性片100的两侧，每个隔膜放料辊对应输送一个隔膜。
加热输送机构6包括两个分别设置在成对的隔膜300的两侧的传送带61，两个传送带61以相反的方向转动，从而能辅助驱动隔膜300运动，传送带61内设置有加热件62，加热件62可以实现对隔膜300的加热，加热件62可以为相关技术中的任意一种，在此不做限定。
本实施例中，如图1所示，第一输送机构4包括第一输送辊41、第一加热组件42、第一裁切组件43及第一机械手，第一输送辊41设置为将连续的第一极性片100输送至第一裁切组件43处，第一裁切组件43设置为将第一极性片100裁断为预设尺寸，第一机械手设置为将预设尺寸的第一极性片100送入第一辊压机构1，第一加热组件42设置在第一输送辊41和第一裁切组件43之间并设置为对第一极性片100的至少一侧加热，从而实现第一输送机构4向第一辊压机构1内输送经过预热处理且具有预设尺寸的第一极性片100。第一裁切组件43的上游位置设置有第一夹持组件，第一夹持组件能夹持住第一极性片100，以便于与第一输送辊41配合对第一极性片100进行输送，并能保证第一裁切组件43裁切过程中第一极性片100的位置稳定。
同样地，第二输送机构5包括第二输送辊51、第二加热组件52、第二裁切组件53及第二机械手，第二输送辊51设置为将连续的第二极性片200输送至第二裁切组件53处，第二裁切组件53设置为将第二极性片200裁断为预设尺寸，第二机械手设置为将预设尺寸的第二极性片200送入第二辊压机构2，第二加热组件52设置在第二输送辊51和第二裁切组件53之间并设置为对第二极性片200的至少一侧加热，从而实现第二输送机构5向第二辊压机构2内输送经过预热处理且具有预设尺寸的第二极性片200。第二裁切组件53的上游设置有第二夹持组件，第二夹持组件能夹持住第二极性片200，以便于与第二输送辊51配合对第二极性片200进行输送，并能保证第二裁切组件53裁切过程中第二极性片200的位置稳定。
第一加热组件42包括两个加热板，两个加热板分别位于第一极性片100的两侧，从而能均匀地对第一极性片100的两侧加热，使第一极性片100能分别对两个隔膜300进行加热。同样地，第二加热组件52包括两个加热板，两个加热板分别位于第二极性片200的两侧，从而使第二极性片200能快速地达到预设的温度，提高加热效率，也使第二输送机构5的结构更为紧凑。
第一输送机构4还包括第一缺陷检测组件44、第一标记组件46第一识别组件47及第一抓取机构，第一缺陷检测组件44能检测连续的第一极性片100上的缺陷，第一标记组件46能对第一极性片100上的缺陷进行标记，第一识别组件47能识别第一极性片100的上的标记，并使第一抓取机构在第一裁切组件43裁断第一极性片100后将具有标记的第一极性片100取走，即在第一极性片100与隔膜300进行复合前，将具有缺陷的第一极性片100进行剔除。第一缺陷检测组件44包括两个检测件，两个检测件分别位于第一极性片100的两侧，以分别对第一极性片100的两侧进行检测，保证第一极性片100两侧均没有缺陷。第一标记组件46可以为喷墨部件、打标部件等，以在第一极性片100的缺陷位置进行标记，相应的，第一识别组件47可以为色标识别传感器，通过识别第一 极性片100上是否有第一标记组件46所打的标记来判别第一极性片100是否有缺陷，当第一识别组件47识别到标记时，第一裁切组件43先将第一极性片100裁断，第一抓取组件再将有缺陷的第一极性片100取走并放置到废料回收位置，缺陷检测组件需打正光，缺陷检测相机距检测位置300～1600mm。一实施例中，相机像素为4k～32k。
本实施例中，第一标记组件46设置在第一加热组件42的上游，第一识别组件47设置在第一加热组件42的下游且位于第一裁切组件43的上游。第一输送机构4包括两个第一标记组件46，两个第一标记组件46分别位于第一极性片100的两侧，以分别对两侧的缺陷进行标记，相应的，第一输送机构4也包括两个第一识别组件47，两个第一识别组件47分别位于第一极性片100的两侧，以对应识别两个第一标记组件46的标记。
在一些实施例中，第一输送机构4可以不设置第一抓取组件，具有缺陷的第一极性片100的取走过程可以由第一机械手实现。
同样的，第二输送机构5还包括第二缺陷检测组件54、第二标记组件56、第二识别组件57及第二抓取机构，第二缺陷检测组件54能检测连续的第二极性片200上的缺陷，第二标记组件56能对第二极性片200上的缺陷进行标记，第二识别组件57能识别第二极性片200的上的标记，并使第二抓取机构在第二裁切组件53裁断第二极性片200后将具有标记的第二极性片200取走。即在第二极性片200与隔膜300进行复合前，将具有缺陷的第二极性片200进行剔除。第二缺陷检测组件54包括两个检测件，两个检测件分别位于第二极性片200的两侧，以分别对第二极性片200的两侧进行检测，保证第二极性片200两侧均没有缺陷。第二标记组件56可以为喷墨部件、打标部件等，以在第二极性片200的缺陷位置进行标记，相应的，第二识别组件57可以为色标传感器，通过识别第二极性片200上是否有第二标记组件56所打的标记来判别第二极性片200是否有缺陷，当第二识别组件57识别到标记时，第二裁切组件53先将第二极性片200裁断，第二抓取组件再将有缺陷的第二极性片200取走致废料回收位置。
本实施例中，第二标记组件56设置在第二加热组件52的上游，第二识别组件57设置在第二加热组件52的下游且位于第二裁切组件53的上游。第二输送机构5包括两个第二标记组件56，两个第二标记组件56分别位于第二极性片200的两侧，以分别对两侧的缺陷进行标记，相应的，第二输送机构5也包括两个第二识别组件57，两个第二识别组件57分别位于第二极性片200的两侧，以对应识别两个第二标记组件56的标记。
在一些实施例中，第二输送机构5可以不设置第二抓取组件，具有缺陷的第二极性片200的取走过程可以由第二机械手实现。
如图1所示，第一输送机构4上设置有第一纠偏组件45，第一纠偏组件45能纠正第一极性片100的位置，防止连续的第一极性片100在输送过程中发生位置的偏斜。第二输送机构5上设置有第二纠偏组件55，第二纠偏组件55能纠正第二极性片200的位置，防止连续的第二极性片200在输送过程中发生位置的偏斜。第一纠偏组件45和第二纠偏组件55可以为相关技术中的任意一种，在此不做限定。
本实施例中，如图1所示，第一辊压机构1包括两个可相对转动的第一压辊11，隔膜300从两个第一压辊11间穿过。热复合叠片设备还包括辊压粘尘机构10，辊压粘尘机构10设置为清洁第一压辊11。第一压辊11可以粘附隔膜300表面的灰尘，辊压粘尘机构10能粘附第一压辊11上的灰尘，从而保证隔膜300的清洁，进而可以不必设置聚对苯二甲酸乙二醇酯(polyethylene glycol terephthalate，PET)膜，简化了热复合叠片设备的结构。本实施例中，如图1所示，辊压粘尘机构10包括一次粘尘辊101和二次粘尘辊102，一次粘尘辊101为软质粘尘辊，比如软质硅胶，粘尘效果好，但粘性低，工作时一次粘尘辊101与第一压辊11抵接并沿相反的方向转动，一次粘尘辊101与第一压辊11线速度相同或存在较小的速度差，从而将第一压辊11上的粉尘粘到一次粘尘辊101上；二次粘尘辊102为硬质粘尘辊，二次粘尘辊102外包裹数十层高粘性粘尘纸，工作时二次粘尘辊102与一次粘尘辊101抵接并沿相反的方向转动，从而将一次粘尘辊101上的粉尘粘到粘尘纸上，后期清洁时只需撕掉一层粘尘纸即可，除尘效果好，且操作方便。
如图2所示，第二辊压机构2包括两个可相对转动的第二压辊21，第二极性片200和中间复合体400从两个第二压辊21间穿过，第二压辊21处也设置辊压粘尘机构10，辊压粘尘机构10能够清洁第二压辊21。第二压辊21可以粘附第二极性片200表面的灰尘及裁切第二极性片200时附着在第二极性片200上的碎屑，辊压粘尘机构10能粘附第二压辊21上的灰尘、碎屑，从而保证第二极性片200的清洁，进而可以不必设置PET膜，简化了热复合叠片设备的结构。第二压辊21处的辊压粘尘机构10与第一压辊11处的辊压粘尘机构10的结构、工作原理相同，在此不再赘述。
如图1和图3所示，叠片机构7包括料盒71和吹气组件72，料盒71的上端设置开口，主输送机构3驱动料带500沿竖向从料盒71的开口进入料盒71，吹气组件72设置在料盒71的一侧，如图3所示，当料带500的端部进入到料盒71上端时，吹气组件72向料盒71的另一侧吹气，从而将料带500的端部吹至与料盒71的另一侧抵接，接着料带500抵接着料盒71向下继续运动，实现首片单元片502的定位，接着吹气组件72停止吹气，料带500自由下落并实现以Z型折叠，使单元片502依次堆叠于料盒71，当单元片502堆叠至预设的数 量后，将料带500裁断即可，此时，装满单元片502的料盒71离开料带500的下方，空的料盒71再运动至料带500的下方，从而保证叠片过程连续进行，减少等待时间，提高生产效率。
如图1所示，叠片机构7还包括反光镜73和位置检测组件74，反光镜73设置在料盒71上侧并位于料带500的两侧，位置检测组件74能发出检测光源，检测光源经反光镜73反射后照射在单元片502上，位置检测组件74能够检测单元片502边缘的位置，从而判断单元片502是否出现放偏的问题，通过借助反光镜73可以灵活设置位置检测组件74的位置，避免位置检测组件74与堆叠前的料带500发生位置干涉，保证检测的准确性。本实施例中，位置检测组件74可以为电荷耦合元件(Charge-coupled Device，CCD)相机或者位置传感器，位置检测组件74能发出水平方向的检测光源，反光镜73以45°角倾斜设置，从而使检测光源垂直照射在单元片502上，其他实施例中，反光镜73的倾斜角度可以根据检测组件的实际放置位置和发出的检测光源的方向灵活调整，在此不做限定。
热复合叠片设备还包括剔除机构，剔除机构设置为剔除具有缺陷的单元片502。剔除机构包括第三缺陷检测组件81、隔膜裁切组件及剔废组件82，第三缺陷检测组件81设置在第二辊压机构2与叠片机构7之间，第三缺陷检测组件81能检测单元片502的缺陷，隔膜裁切组件设置在料盒71上侧，隔膜裁切组件能裁断具有缺陷的单元片502下游的隔膜段501，剔废组件82能裁断具有缺陷的单元片502上游的隔膜段501，并带动具有缺陷的单元片502离开料盒71上方，从而避免具有缺陷的单元片502堆叠入料盒71内。第三缺陷检测组件81包括全景检测件811和短路检测件812，全景检测件811设置为检测单元片502的形状、位置精度等缺陷，短路检测件812检测单元片502是否出现短路问题，只要全景检测件811和短路检测件812中的任意一个检测结果为不合格，则将该单元片502标记为具有缺陷的单元片502。
隔膜裁切组件为伸缩式结构，当不使用时，隔膜裁切组件缩回并离开料盒71上方以避让料带500，当使用时，隔膜裁切结构伸出至料盒71上方并对隔膜段501进行裁切。剔废组件82包括可伸缩的载台及设置在载台上的裁剪组件，当需要剔除缺陷单元片502，且在隔膜裁切组件将单元片502下游的隔膜段501切断之后，载台伸出至该缺陷单元片502的下方，裁剪组件将该缺陷单元片502上游的隔膜段501切断，此时缺陷单元片502落在载台上，载台缩回可以将缺陷单元片502取走。
由于料盒71内最终形成的堆叠体的堆叠层数是预定的，且料带500上第一种单元片5021和第二种单元片5022的排布次序也是对应的，当有缺陷单元片 502被剔除后，若料带500直接继续向料盒71内堆叠则无法保证最终形成的堆叠体为负极包覆正极的结构。
热复合叠片设备还包括补片机构9，补片机构9能够向料盒71内补充预备好的单元片502。当有缺陷单元片502被剔除后，可以向料盒71内对应补充与剔除的缺陷单元片502种类相同的单元片502，从而保证料带500后续的堆叠能够顺利进行。补片机构9包括补料弹夹91、对位平台92及补片机械手，补料弹夹91内设置有单元片502，补片机械手能从补料弹夹91内抓取单元片502并放置在对位平台92上，对位平台92能够对单元片502进行定位识别，接着补片机械手抓取对位平台92上经过定位的单元片502并调整单元片502的姿态后放入料盒71内，保证单元片502的位置放置精度。本实施例中，补片机构9包括两个补料弹夹91，其中一个补料弹夹91内放置有第一种单元片5021，另一个补料弹夹91内放置有第二种单元片5022，当料带500上有缺陷单元片502被剔除后，补片机械手从对应的料盒71内抓取与剔除单元片502种类一致的单元片502进行补料。
如图4所示，本实施例还提供了一种热复合叠片方法，包括：
提供经过预热处理且具有预设尺寸的第一极性片100；提供成对的隔膜300，并使成对的隔膜300分别位于第一极性片100的两侧；对隔膜300加热并将隔膜300和第一极性片100复合为中间复合体400；向中间复合体400的一侧提供预热处理并具有预设尺寸的第二极性片200；将第二极性片200和中间复合体400压合为料带500，料带500具有交替设置的隔膜段501和单元片502；折叠料带500，使单元片502依次堆叠，隔膜段501位于单元片502的两端。
本实施例的热复合叠片方法分别在隔膜300与第一极性片100热复合前先对第一极性片100进行预热处理、在将中间复合体400与第二极性片200压合之前对第二极性片200先进行预热处理，故可以使中间复合体400热压的步骤中的热压长度减小、加热功率降低，使得热复合设备更为紧凑；此外，经预热处理后的第一极性片100从内向外对隔膜300进行加热、中间复合体400热压过程的功率减小等均有利于降低整个热压复合过程中的热量损失。
热复合叠片方法，还包括：
在折叠料带500前，检测单元片502是否有缺陷，当检测到具有缺陷的单元片502时，在折叠料带500时将有缺陷的单元片502裁切并剔除，并将预备的完好的单元片502补充放置在已堆叠的单元片502上。
由于料带500上的单元片502包括第一种单元片5021和第二种单元片5022两种，则预备的完好的单元片502也应该包括第一种单元片5021和第二种单元 片5022两种，通过缺陷单元片502的剔除及完好的单元片502的补充，保证最终形成的堆叠体中第一种单元片5021和第二种单元片5022的堆叠次序保持不变，进而保证形成的堆叠体能够为负极包覆正极的结构。
本实施例还提供了一种电芯，电芯通过上述的热复合叠片方法制造而成。所述电芯包括相对设置的两层连续式隔膜，所述两层连续式隔膜之间夹着间隔设置的多个第一极性片100，以在连续式隔膜上形成多个间隔设置的中间复合体400，第二极性片200在中间复合体400的第一表面或第二表面是不连续分布的，同时第二极性片200在中间复合体400的第一表面和第二表面上是不对称分布的，以中间复合体400为单位依次进行Z型折叠得到所述电芯。

Claims (11)

  1. 一种热复合叠片设备，包括：
    第一辊压机构(1)；
    第二辊压机构(2)；
    主输送机构(3)，设置为沿预设轨迹输送成对的隔膜(300)，以使所述成对的隔膜(300)依次经过所述第一辊压机构(1)和所述第二辊压机构(2)；
    第一输送机构(4)，设置为向所述第一辊压机构(1)内送入经预热处理且具有预设尺寸的第一极性片(100)，并使所述第一极性片(100)夹设于所述成对的隔膜(300)之间；
    加热输送机构(6)，设置在所述第一辊压机构(1)和所述第二辊压机构(2)之间，设置为将所述成对的隔膜(300)和所述第一极性片(100)复合为中间复合体(400)；
    第二输送机构(5)，设置为向所述第二辊压机构(2)内送入经预热处理且具有预设尺寸的第二极性片(200)，并使所述第二极性片(200)位于所述成对的隔膜(300)外侧，所述第二辊压机构(2)设置为将所述第二极性片(200)和所述中间复合体(400)压合为料带(500)。
  2. 如权利要求1所述的热复合叠片设备，其中，满足以下至少之一：
    所述第一输送机构(4)包括第一输送辊(41)、第一加热组件(42)、第一裁切组件(43)及第一机械手，所述第一输送辊(41)设置为输送连续的第一极性片(100)，所述第一裁切组件(43)设置为将所述连续的第一极性片(100)裁断为预设尺寸，所述第一机械手设置为将预设尺寸的第一极性片(100)送入所述第一辊压机构(1)，所述第一加热组件(42)设置在所述第一输送辊(41)和所述第一裁切组件(43)之间并设置为对所述连续的第一极性片(100)的至少一侧加热；
    所述第二输送机构(5)包括第二输送辊(51)、第二加热组件(52)、第二裁切组件(53)及第二机械手，所述第二输送辊(51)设置为输送连续的第二极性片(200)，所述第二裁切组件(53)设置为将所述连续的第二极性片(200)裁断为预设尺寸，所述第二机械手设置为将预设尺寸的第二极性片(200)送入所述第二辊压机构(2)，所述第二加热组件(52)设置在所述第二输送辊(51)和所述第二裁切组件(53)之间并设置为对所述连续的第二极性片(200)的至少一侧加热。
  3. 如权利要求2所述的热复合叠片设备，其中，满足以下至少之一：
    所述第一输送机构(4)还包括第一缺陷检测组件(44)、第一标记组件(46)、 第一识别组件(47)及第一抓取机构，所述第一缺陷检测组件(44)设置为检测所述连续的第一极性片(100)上的缺陷，所述第一标记组件(46)设置为对所述连续的第一极性片(100)上的缺陷进行标记，所述第一识别组件(47)设置为识别所述连续的第一极性片(100)的上的标记，并使所述第一抓取机构在所述第一裁切组件(43)裁断所述连续的第一极性片(100)后将具有标记的第一极性片(100)取走；
    所述第二输送机构(5)还包括第二缺陷检测组件(54)、第二标记组件(56)、第二识别组件(57)及第二抓取机构，所述第二缺陷检测组件(54)设置为检测所述连续的第二极性片(200)上的缺陷，所述第二标记组件(56)设置为对所述连续的第二极性片(200)上的缺陷进行标记，所述第二识别组件(57)设置为识别所述连续的第二极性片(200)的上的标记，并使所述第二抓取机构在所述第二裁切组件(53)裁断所述连续的第二极性片(200)后将具有标记的第二极性片(200)取走。
  4. 如权利要求1所述的热复合叠片设备，其中，满足以下至少之一：
    所述第一辊压机构(1)包括两个可相对转动的第一压辊(11)，所述成对的隔膜(300)从所述两个第一压辊(11)间穿过；所述热复合叠片设备还包括辊压粘尘机构(10)，所述辊压粘尘机构(10)设置为清洁所述第一压辊(11)；
    所述第二辊压机构(2)包括两个可相对转动的第二压辊(21)，所述第二极性片(200)和所述中间复合体(400)从所述两个第二压辊(21)间穿过；所述热复合叠片设备还包括辊压粘尘机构(10)，所述辊压粘尘机构(10)设置为清洁所述第二压辊(21)。
  5. 如权利要求1-4任一项所述的热复合叠片设备，其中，所述料带(500)包括交替设置的隔膜段(501)和单元片(502)；所述热复合叠片设备还包括设置在所述第二辊压机构(2)下游的叠片机构(7)，所述叠片机构(7)包括：
    料盒(71)，所述料盒(71)上端设置开口，所述主输送机构(3)还设置为驱动所述料带(500)沿竖向从所述开口进入所述料盒(71)；
    吹气组件(72)，设置在所述料盒(71)的一侧，所述吹气组件(72)设置为向所述料盒(71)的另一侧吹气，以使所述料带(500)的端部与所述另一侧抵接，在所述吹气组件(72)停止吹气后所述料带(500)以Z型折叠，并使所述料带(500)的单元片(502)依次堆叠于所述料盒(71)。
  6. 如权利要求5所述的热复合叠片设备，其中，所述叠片机构(7)还包括：
    反光镜(73)，设置在所述料盒(71)上侧并位于所述料带(500)的两侧；
    位置检测组件(74)，设置为发出检测光源，所述检测光源经所述反光镜(73)反射后照射在所述单元片(502)上，所述位置检测组件(74)设置为检测所述单元片(502)的位置。
  7. 如权利要求5所述的热复合叠片设备，还包括剔除机构，所述剔除机构设置为剔除具有缺陷的单元片(502)；
    所述剔除机构包括：
    第三缺陷检测组件(81)，设置在所述第二辊压机构(2)与所述叠片机构(7)之间，所述第三缺陷检测组件(81)设置为检测所述料带(500)的单元片(502)的缺陷；
    隔膜裁切组件，设置在所述料盒(71)上侧，所述隔膜裁切组件设置为裁断具有缺陷的单元片(502)下游的隔膜段(501)；
    剔废组件(82)，设置为裁断所述具有缺陷的单元片(502)上游的隔膜段(501)，并带动所述具有缺陷的单元片(502)离开所述料盒(71)上方。
  8. 如权利要求5所述的热复合叠片设备，还包括补片机构(9)，所述补片机构(9)设置为向所述料盒(71)内补充预备好的单元片(502)；
    所述补片机构(9)包括：
    补料弹夹(91)，所述补料弹夹(91)内设置有单元片(502)；
    对位平台(92)，设置为对放置于所述对位平台(92)上的单元片(502)进行定位；
    补片机械手，设置为从所述补料弹夹(91)内抓取单元片(502)并放置在所述对位平台(92)上进行定位，且抓取所述对位平台(92)上的所述单元片(502)并调整所述单元片(502)的姿态后放入所述料盒(71)内。
  9. 一种热复合叠片方法，包括：
    提供经过预热处理且具有预设尺寸的第一极性片(100)；
    提供成对的隔膜(300)，并使所述成对的隔膜(300)分别位于所述第一极性片(100)的两侧；
    对所述成对的隔膜(300)加热并将所述成对的隔膜(300)和所述第一极性片(100)复合为中间复合体(400)；
    向所述中间复合体(400)的一侧提供预热处理并具有预设尺寸的第二极性片(200)；
    将所述第二极性片(200)和所述中间复合体(400)压合为料带(500)， 其中，所述料带(500)具有交替设置的隔膜段(501)和单元片(502)；
    折叠所述料带(500)，使所述料带(500)的单元片(502)依次堆叠，其中，所述隔膜段(501)位于所述单元片(502)的两端。
  10. 如权利要求9所述的热复合叠片方法，在所述折叠所述料带(500)之前，还包括：
    检测所述料带(500)的单元片(502)是否有缺陷；
    所述折叠所述料带(500)，包括：
    在检测到具有缺陷的单元片(502)的情况下，将所述具有缺陷的单元片(502)裁切并剔除，将预备的完好的单元片(502)补充放置在已堆叠的单元片(502)上。
  11. 一种电芯，通过权利要求9-10任一项所述热复合叠片方法制备而成。
PCT/CN2022/082795 2021-07-23 2022-03-24 热复合叠片设备及热复合叠片方法 WO2023000702A1 (zh)

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