WO2021008553A1 - 模切叠片系统及方法 - Google Patents

模切叠片系统及方法 Download PDF

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Publication number
WO2021008553A1
WO2021008553A1 PCT/CN2020/102124 CN2020102124W WO2021008553A1 WO 2021008553 A1 WO2021008553 A1 WO 2021008553A1 CN 2020102124 W CN2020102124 W CN 2020102124W WO 2021008553 A1 WO2021008553 A1 WO 2021008553A1
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WO
WIPO (PCT)
Prior art keywords
lamination
negative electrode
positive electrode
cutting
diaphragm
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PCT/CN2020/102124
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English (en)
French (fr)
Inventor
金省周
郑赫
赵凯
徐春龙
滕立杰
金正贤
王洋
Original Assignee
蜂巢能源科技有限公司
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Application filed by 蜂巢能源科技有限公司 filed Critical 蜂巢能源科技有限公司
Priority to EP20840055.6A priority Critical patent/EP4002542A4/en
Priority to KR1020227005228A priority patent/KR20220035211A/ko
Publication of WO2021008553A1 publication Critical patent/WO2021008553A1/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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • 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
    • H01M10/0463—Cells or batteries with horizontal or inclined electrodes
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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 disclosure belongs to the technical field of batteries, and particularly relates to a die-cutting lamination system and method.
  • Lithium-ion equipment technology is a key technology for the development of electric vehicles.
  • Square lamination technology is currently one of the most advanced lithium-ion battery manufacturing technologies, among which the lamination speed directly determines the production capacity of the entire line and the cost of cell manufacturing.
  • the second is that the traditional lamination method is first Stack the negative electrode, then wrap the separator on the negative electrode sheet, then stack the positive electrode, and then wrap the separator on the positive electrode.
  • the lamination unit of this lamination method is a single pole piece or a single diaphragm. Due to mechanical structure limitations, the lamination speed cannot be achieved. Substantial improvement. Therefore, the lamination process needs to be further improved.
  • the present disclosure aims to propose a die-cutting lamination system to improve lamination efficiency.
  • a die-cutting lamination system including:
  • the unwinding mechanism includes a negative unwinding mechanism, a diaphragm unwinding mechanism and a positive unwinding mechanism, and the negative unwinding mechanism and the positive unwinding mechanism are arranged on the upper and lower sides of the diaphragm unwinding mechanism ,
  • the negative electrode unwinding mechanism and the positive electrode unwinding mechanism operate alternately;
  • Pole roll cutting mechanism the pole roll cutting mechanism is arranged downstream of the unwinding mechanism, the pole roll cutting mechanism includes a negative electrode cutting mechanism and a positive electrode cutting mechanism, the negative electrode cutting mechanism cooperates with the negative electrode unwinding mechanism and cuts Cutting the negative electrode piece, the positive electrode cutting mechanism cooperates with the positive electrode unwinding mechanism and cuts the positive electrode piece to obtain a laminate in which the negative electrode piece and the positive electrode piece are alternately distributed on the upper and lower sides of the separator;
  • the preheating and rolling equipment includes a preheating device and a rolling device that are connected in sequence.
  • the preheating device is arranged between the unwinding mechanism and the rolling device.
  • the device is arranged downstream of the pole roll cutting mechanism, and the rolling device makes the laminated positive electrode sheet and the negative electrode sheet adhere to the separator, respectively, to obtain laminated sheets with alternately distributed positive electrode lamination units and negative electrode lamination units;
  • a detection device the detection device is arranged downstream of the preheating roller pressing equipment, and detects whether the laminate has defects;
  • a diaphragm cutting mechanism includes a first diaphragm cutting mechanism and a second diaphragm cutting mechanism, the first diaphragm cutting mechanism is located upstream of the second diaphragm cutting mechanism, and based on the detection result of the detection device, the The first diaphragm cutting mechanism cuts and discharges the defective positive/negative laminate unit and the adjacent negative/positive laminate unit in pairs, and the second diaphragm cutting mechanism compares the last qualified laminate based on the number of laminate layers.
  • a lamination device the lamination device is arranged downstream of the separator cutting mechanism, and the lamination device makes the positive electrode lamination unit and the negative electrode lamination unit alternately stacked.
  • the stacking device includes a clamping jaw, a first auxiliary roller, and a second auxiliary roller, and the clamping jaw is movable with the first auxiliary roller and cooperates with the second auxiliary roller to make the positive electrode laminate
  • the unit and the negative electrode lamination unit are spread in alignment and alternately stacked.
  • the negative electrode unwinding mechanism, the diaphragm unwinding mechanism and the positive electrode unwinding mechanism are distributed from top to bottom or from bottom to top.
  • the die-cutting lamination system further includes a plurality of tension rollers, the plurality of tension rollers are provided between the unwinding mechanism and the pole-roll cutting mechanism, and between the negative electrode sheet and the separator And the upper side and/or the lower side of the positive electrode sheet are spaced apart.
  • the cut length of the positive electrode sheet is smaller than the cut length of the negative electrode sheet; in the adjacent positive electrode lamination unit and the negative electrode lamination unit, the level between the positive electrode sheet and the negative electrode sheet The spacing is 1 ⁇ 6mm.
  • the die-cutting lamination system further includes a discharge machine, which is arranged downstream of the detection device and cooperates with the first diaphragm cutting mechanism to discharge defective lamination units.
  • the die-cutting lamination system described in the present disclosure has the following advantages:
  • the die-cutting lamination system described in the present disclosure integrates the die-cutting device and the lamination device.
  • the feeding elastic clip is eliminated, breaking through the restriction of the elastic clip feeding, and on the other hand, the pole piece is made by preheating and rolling.
  • the lamination feeding is coiled material instead of single-sheet feeding, continuous feeding can break through the mechanical structure limit, increase the lamination speed, reduce the system failure rate; (2) not only can greatly reduce the number of lamination machines , Reduce the equipment purchase cost and reduce the energy consumption of the equipment, and it can also make the theoretical lamination speed reach 0.25 ⁇ 0.6s/piece; (3) After the diaphragm is cut, the shape of the diaphragm edge cannot be guaranteed, and there are diaphragm wrinkles and external drain during the lamination process When the die-cutting lamination system is used for lamination, the diaphragm between the undefective lamination units is not cut, and only after the lamination is completed, the number of diaphragm cutting is extremely small, which greatly reduces To reduce the risk of diaphragm wrinkles and external drain plates; (4) If each lamination unit is individually cut and then inspected and laminated, the cut lamination unit needs to be transferred to the positioning platform and tested by the inspection device.
  • the lamination method of the system can be horizontal lamination, which can be more conducive to lamination alignment, and the system has a smaller space occupation rate in the vertical direction.
  • Another object of the present disclosure is to provide a method for die-cutting and lamination using the above-mentioned die-cutting lamination system to improve the efficiency of lamination.
  • the technical solution of the present disclosure is achieved as follows: A method for die-cutting laminated sheets is proposed, including:
  • the detection device is used to detect whether the lamination is defective, and the first separator cutting mechanism analyzes the defective positive/negative stack unit and the adjacent negative/positive stack based on the detection result of the detection device. Pieces are cut and discharged in pairs;
  • the length of the positive electrode sheet in the electrode group is less than the length of the negative electrode sheet, and the length of the negative electrode sheet is 0.5-3 mm shorter than the length of the separator.
  • the clamping jaws, the first auxiliary roller, and the second auxiliary roller that are used in conjunction to stack the lamination unit, so as to obtain the positive electrode lamination unit and the negative electrode lamination unit being spread and aligned And alternately stacked pole groups.
  • the negative electrode sheet is located above the separator, and the positive electrode sheet is located below the separator.
  • the negative electrode sheet is located above the separator, and the positive electrode sheet is located below the separator.
  • the method for die-cut lamination described in the present disclosure has the following advantages:
  • the lamination feeding is coil material instead of single piece feeding, continuous feeding can break through the mechanical structure limitation, increase the lamination speed, reduce the system failure rate; (2) simultaneously lamination of the pole piece and diaphragm, stacking The film speed is fast, and the theoretical lamination speed can reach 0.25 ⁇ 0.6s/sheet; (3) The number of cuts of the diaphragm is very small, which greatly reduces the risk of the diaphragm wrinkles and the external drain film; (4) Each laminated unit is separate Compared with lamination after cutting, the lamination unit does not need to be transported and the process is simpler; (5) The lamination method can be horizontal lamination, which is more conducive to lamination than the vertical lamination method. Aligned.
  • Fig. 1 is a schematic structural diagram of a die-cutting lamination system according to an embodiment of the present disclosure
  • FIG. 2 is a schematic diagram of a laminate structure in which positive electrode lamination units and negative electrode lamination units are alternately distributed according to an embodiment of the disclosure
  • FIG. 3 is a schematic diagram of transferring and stacking the laminated unit by using clamping jaws and auxiliary rollers according to an embodiment of the present disclosure
  • Fig. 4 is a schematic diagram of a die-cutting lamination system adopting a clamping jaw to clamp a lamination unit according to an embodiment of the disclosure.
  • the present disclosure proposes a die-cutting lamination system.
  • the system includes: an unwinding mechanism 100, a pole roll cutting mechanism 200, a preheating roller pressing device 300, a detection device 400, a diaphragm cutting mechanism 500 and a lamination device 600.
  • the unwinding mechanism 100 includes a negative unwinding mechanism 110, a diaphragm unwinding mechanism 120, and a positive unwinding mechanism 130, and the negative unwinding mechanism 110 and the positive unwinding mechanism 130 are arranged above and below the diaphragm unwinding mechanism 120 On both sides, the negative electrode unwinding mechanism 110 and the positive electrode unwinding mechanism 130 operate alternately; the pole coil cutting mechanism 200 is located downstream of the unwinding mechanism 100, the pole coil cutting mechanism 200 includes a negative electrode cutting mechanism 210 and a positive electrode cutting mechanism 220, and a negative electrode cutting mechanism 210 Cooperate with the negative electrode unwinding mechanism 110 and cut the negative electrode sheet, and the positive electrode cutting mechanism 220 cooperates with the positive electrode unwinding mechanism 130 and cut the positive electrode sheet to obtain a laminate with negative electrode sheets and positive electrode sheets alternately distributed on the upper and lower sides of the separator.
  • the positive electrode unwinding mechanism 130 suspends unwinding. After the cutting operation of the negative electrode cutting mechanism 210 is completed, the negative electrode unwinding mechanism 110 suspends unwinding, and the positive electrode unwinding mechanism 130 starts unwinding and goes to the positive electrode cutting mechanism 220 for cutting.
  • the positive electrode unwinding mechanism 130 pauses unwinding, and the negative electrode unwinding mechanism 110 starts to unwind to the negative electrode cutting mechanism 110 Perform cutting; alternately, so that the cut negative sheet and positive sheet are alternately distributed on the upper and lower sides of the separator, wherein the separator unwinding mechanism 120 is continuously performed relative to the negative electrode cutting mechanism 110 and/or the positive electrode cutting mechanism 130 .
  • the die-cutting lamination system may further include a plurality of tension rollers 700, and the plurality of tension rollers 700 are provided between the unwinding mechanism 100 and the pole-roll cutting mechanism 200, and The negative electrode sheet, the separator, and the upper side and/or the lower side of the positive electrode sheet are spaced apart, which can be more beneficial to realize the unwinding and start-stop of the electrode sheet and the separator.
  • the unwinding and cutting intervals of the positive electrode unwinding mechanism, the negative electrode unwinding mechanism, the positive electrode cutting mechanism and the negative electrode cutting mechanism can be comprehensively adjusted, so that the cut length of the positive electrode sheet is smaller than that of the negative electrode sheet.
  • the horizontal distance d between the positive electrode sheet and the negative electrode sheet in the adjacent positive electrode stack unit and the negative electrode stack unit is 1 to 6 mm (as shown in Figure 1), so that the final separator in the electrode group can be obtained .
  • the length of the negative electrode sheet and the positive electrode sheet are successively reduced.
  • the length of the negative electrode sheet can be 0.5-3mm shorter than the length of the separator to ensure that the electrode assembly has higher safety and stability. It should be noted that the length mentioned in this disclosure is based on the direction of movement of the pole piece, and can also be understood as the length of each side.
  • the negative electrode unwinding mechanism 110, the diaphragm unwinding mechanism 120, and the positive electrode unwinding mechanism 130 in the unwinding mechanism 100 can be distributed from top to bottom or bottom to top, where FIG. 2 is A schematic diagram of the alternating positive electrode lamination unit A and the negative electrode lamination unit B when the negative electrode unwinding mechanism 110, the diaphragm unwinding mechanism 120 and the positive electrode unwinding mechanism 130 are distributed from bottom to top.
  • the preheating and rolling equipment 300 includes a preheating device (not separately shown) and a rolling device (not separately shown) connected in sequence, and the preheating device is provided in the unwinding mechanism 100 and the rolling device.
  • the roller pressing device is arranged downstream of the pole roll cutting mechanism 200, and the roller pressing device makes the laminated positive electrode sheet and the negative electrode sheet adhere to the separator, respectively, to obtain a laminated sheet in which the positive electrode laminate unit A and the negative electrode laminate unit B are alternately distributed .
  • the preheating device can begin to preheat the separator and the positive and negative electrodes before the pole pieces are cut, which can make the preheating time longer, thereby further improving the adhesion effect of the pole pieces and the separator after rolling;
  • Unit A includes a layer of positive electrode sheet and a layer of separator, and negative electrode lamination unit B includes a layer of negative electrode sheet and a layer of film.
  • the detection device 400 is provided downstream of the preheating and rolling device 300, and detects whether the laminated sheet has defects.
  • the detection device 400 can be used to detect the pole piece position, size, wrinkles, tab wrinkles, folded edges, missing corners, etc., so as to discard defective laminated units in time; and when the detection device is used to detect the laminated units, The laminated unit does not need to be transported, and there is no need to separately add a positioning platform and a group of manipulators, and the structure is simpler.
  • the detection device 400 may be a CCD detection mechanism.
  • the diaphragm cutting mechanism 500 includes a first diaphragm cutting mechanism 510 and a second diaphragm cutting mechanism 520.
  • the first diaphragm cutting mechanism 510 is located upstream of the second diaphragm cutting mechanism 520.
  • a diaphragm cutting mechanism 510 cuts and discharges the defective positive/negative laminate unit and the adjacent negative/positive laminate unit in pairs, and the second diaphragm cutting mechanism 520 compares the last qualified laminate based on the number of laminate layers The unit performs diaphragm cutting.
  • the positive electrode lamination unit and the negative electrode lamination unit need to be discharged in pairs. For example, if a positive electrode lamination unit has a defect, it needs to be discarded at the same time.
  • a negative electrode lamination unit in addition, in the subsequent lamination process, the diaphragm between the laminate units without defects is not cut, and the second diaphragm cutting mechanism is used to cut the diaphragm only after the lamination is completed. The number of cutting is extremely small, which greatly reduces the risk of the diaphragm wrinkling the outer drain sheet during the lamination process.
  • the die-cutting lamination system may further include a discharge machine 800, which may be arranged downstream of the detection device 400 and cooperate with the first cutting mechanism 510. Based on the display of the detection device 400, the discharge machine Defective lamination unit.
  • the discharge machine 800 may be an NG discharge machine.
  • the lamination device 600 is provided downstream of the separator cutting mechanism 500, and the lamination device 600 alternately stacks the positive electrode lamination unit A and the negative electrode lamination unit B, thereby obtaining a multi-layer positive electrode sheet and a multilayer The pole group of the negative plate.
  • the lamination device 600 may include a clamping jaw 610, a first auxiliary roller 620 and a second auxiliary roller 630, and the clamping jaw 610 and the first auxiliary roller
  • the 620 is movable and cooperates with the second auxiliary roller 630 so that the positive electrode lamination unit A and the negative electrode lamination unit B are spread in alignment and alternately stacked.
  • the clamping jaws clamp the laminations from the upper and lower sides of the lamination unit (as shown in Figure 4, the clamping jaws can go up and down from both sides perpendicular to the direction of movement of the pole piece Pinch the laminate), the first auxiliary roller and the second auxiliary roller cooperate with the clamping jaws to realize the stacking of two adjacent lamination units and assist the alignment of the lamination units; wherein the position of the second auxiliary roller is relatively fixed and can be finely adjusted , By adjusting the first auxiliary roller and the second auxiliary roller to control the tension of the lamination unit to realize the alternate stacking and alignment of the lamination unit; in addition, the method of lamination by the clamping jaws and the auxiliary roller is horizontal lamination.
  • the clamping jaws are used in the present disclosure to replace the negative pressure manipulator to realize the transfer of the lamination unit , It can also effectively avoid the risk of the lower pole piece/diaphragm falling when the upper side of the lamination unit is sucked to transport the lamination unit.
  • the lamination device 600 includes two sets of first auxiliary rollers 620 and second auxiliary rollers 630, wherein one set is in working state, and the auxiliary rollers cooperate with the clamping jaws to realize two adjacent laminations
  • the stacking and alignment of the unit, the other group is in the ready state, ready to stack and align the next pair of lamination units, after the two adjacent lamination units are stacked and aligned, the auxiliary roller in the working state is removed Exit and enter the ready state.
  • the first auxiliary roller 620 is located at position 1
  • the second auxiliary roller 630 is located at position 2.
  • the negative electrode unwinding mechanism 110, the diaphragm unwinding mechanism 120, and the positive electrode unwinding mechanism 130 in the unwinding mechanism 100 are distributed from top to bottom, the negative electrode sheet is located above the separator, and the positive electrode sheet is located on the separator.
  • a plurality of negative electrode lamination units and a plurality of positive electrode lamination units can be stacked alternately, and then another layer of separator can be stacked;
  • the negative electrode unwinding mechanism 110, the separator unwinding mechanism 120 and the positive electrode unwinding mechanism 100 are When the winding mechanism 130 is distributed from bottom to top, the positive electrode sheet is located above the separator and the negative electrode sheet is located below the separator.
  • a layer of separator is stacked in advance, multiple positive electrode stack units and multiple negative electrode stack units can be alternately stacked.
  • the first-layer pole piece of each pole group is a negative electrode piece, taking the negative electrode unwinding mechanism 110, the diaphragm unwinding mechanism 120, and the positive electrode unwinding mechanism 130 from top to bottom as an example.
  • N is an odd number
  • the positive electrode is (N-1)/2 layer
  • the negative electrode is (N+1)/2 layer.
  • the positive unwinding mechanism stops unwinding, so that a separate section of diaphragm is reserved between the (N+1)/2th negative sheet and the (N+1)/2+1th negative sheet, waiting for (N+1) /2+1 pieces of negative electrode sheet are cut after the positive electrode unwinding mechanism continues to unwind.
  • the second diaphragm cutting mechanism performs diaphragm cutting, and the diaphragm cutting position is the right side of the (N+1)/2+1th negative electrode sheet, and the distance from the rightmost end of the electrode sheet is 0.5-3mm. After cutting, cover the last layer of separator reserved on the last negative plate. Then stick the fixing tape, and finally cut the material.
  • the die-cutting lamination system of the present disclosure has the following advantages: (1)
  • the die-cutting lamination system of the present disclosure integrates the die-cutting device and the lamination device, on the one hand, it eliminates the loading magazine and breaks through the magazine. Feeding limitation, on the other hand, the pole piece and the diaphragm are adhered by preheating and rolling, and the lamination feeding is coiled material instead of single piece feeding, which can break through the mechanical structure limitation and increase the lamination speed; (2) Not only can it greatly reduce The number of stackers can be continuously fed, which reduces equipment purchase costs and equipment energy consumption.
  • the number of times the diaphragm is cut is very small, which greatly reduces the risk of the diaphragm wrinkling the outer drain sheet; (4) If each laminated unit is individually cut and then inspected and laminated, it is necessary to transfer the cut laminated unit to The positioning platform is transferred to the lamination platform after being detected by the detection device, that is, a set of manipulators and a positioning platform need to be added, and when the die-cut lamination system in the present disclosure is used to detect the lamination unit, there is no need to separate the lamination unit Adding a positioning platform and a set of manipulators makes the structure simpler; (5) The stacking method of the system can be horizontal stacking, which can be more conducive to the alignment of the stacks, and the space occupation rate of the system in the vertical direction is higher. small.
  • the present disclosure proposes a method for die-cutting laminates using the above-mentioned die-cutting laminate system.
  • the method includes: (1) Utilizing an unwinding mechanism to provide pole pieces and a film, matching the negative electrode cutting mechanism with the negative electrode unwinding mechanism and cutting the negative electrode pieces, so that the positive electrode cutting mechanism and the positive electrode The unwinding mechanism cooperates and cuts the positive electrode sheet to obtain a stack of negative electrode sheets and positive electrode sheets alternately distributed on the upper and lower sides of the separator; (2) Preheat the separator and the positive electrode sheet before and after the cutting by using the preheating device, and Roll the laminate using a rolling device to make the laminated positive and negative sheets adhere to the separator respectively, to obtain alternately distributed laminates of positive and negative lamination units; (3) Use a detection device to detect the laminate Whether the sheet is defective, the first diaphragm cutting mechanism cuts and discharges the defective positive/negative electrode lamination unit and the adjacent negative
  • the clamping jaws, the first auxiliary roller, and the second auxiliary roller can be used in conjunction to stack the lamination unit, so as to obtain the positive electrode lamination unit and the negative electrode lamination unit being spread aligned and alternately stacked. Put the pole group.
  • the lamination method is horizontal lamination.
  • the pressing manipulator realizes the transfer of the lamination unit, and can also effectively avoid the risk of the lower pole piece/diaphragm falling when the upper side of the lamination unit is sucked to transfer the lamination unit.
  • the length of the positive electrode sheet in the finally obtained electrode assembly is smaller than the length of the negative electrode sheet, and the length of the negative electrode sheet may be 0.5-3 mm shorter than the length of the separator. This avoids the risk of exposed pole pieces.
  • a plurality of negative electrode laminate units and a plurality of positive electrode laminate units can be alternately stacked in advance, and then another layer of separator is stacked.
  • a layer of separator can be stacked in advance, and then multiple positive electrode lamination units and multiple negative electrode lamination units can be alternately stacked.
  • the die-cutting lamination method of the present disclosure has the following advantages: (1) In this method, the pole piece cutting and lamination are coupled, on the one hand, the loading magazine is cancelled and the magazine loading limitation is broken. On the other hand, preheating and rolling make the pole piece and the diaphragm adhere to form a laminated unit.
  • the laminated sheet feeding is a roll material rather than a single sheet feeding, which can be continuously fed, which can break through the mechanical structure limitation and increase the lamination speed; 2) Lamination of the pole piece and diaphragm at the same time, the lamination speed is fast, and the theoretical lamination speed can reach 0.25 ⁇ 0.6s/piece; (3) The number of cuts of the diaphragm is very small, which greatly reduces the risk of the diaphragm wrinkling the external drain plate (4) Compared with the detection and lamination of each lamination unit after individually cutting, the lamination unit does not need to be transported for inspection, and the process is simpler; (5) The lamination method can be horizontal lamination, Compared with the vertical lamination method, it is more conducive to lamination alignment. It should be noted that the features and effects described above for the die-cutting lamination system are also applicable to the die-cutting lamination method, and will not be repeated here.

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Abstract

提供了一种模切叠片系统及方法。该系统包括放卷机构、极卷裁断机构、预热辊压设备、检测装置、隔膜裁断机构和叠片装置，其中，负极裁断机构与负极放卷机构配合且裁切负极片，正极裁断机构与正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；预热辊压装置使叠层的正极片和负极片分别与隔膜粘连；检测装置检测叠片是否存在缺陷；第一隔膜裁断机构对有缺陷的叠片单元成对进行裁断和排出，第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断；叠片装置使正极叠片单元和负极叠片单元交替叠放。

Description

模切叠片系统及方法
优先权信息
本公开请求于2019年07月16日向中国国家知识产权局提交的、专利申请号为201910642631.6、申请名称为“模切叠片系统及方法”的中国专利申请的优先权，并且其全部内容通过引用结合在本公开中。
技术领域
本公开属于电池技术领域，特别涉及一种模切叠片系统及方法。
背景技术
在使用传统能源作为动力供给的汽车工业环境下，环境污染问题引起了人们对环境保护和资源利用的重视。积极发展新能源汽车，实现汽车工业的电气化，是实现我国对国外汽车工业“弯道超车”这一目标的战略性措施。锂离子设备技术是电动汽车发展的关键技术。方形叠片技术是目前最先进的锂离子电池制造技术之一，其中，叠片速度快慢直接决定整线产能与电芯制造成本。
目前大都采用z型叠片工艺，但已经量产的全球最快的叠片速度为0.6s/片，该叠片方法速度较慢，造成设备台数需求量大，占地面积大，购置成本高，后期维护成本、能源消耗大。而叠片速度慢的原因主要有两点：一是叠片采用弹夹式上料，上料过程中会有吸双张现象出现，故传统叠片机会有吹风、毛刷、抖片、双张检测等装置来防止吸双张，目前来看，无论采用何种方式都无法百分之百杜绝双张问题产生，并且这些装置极大地降低了机械手上料的速度；二是传统的叠片方式是先叠负极，再在负极片包覆隔膜，然后再叠正极，接着在正极包裹隔膜，该叠片方式的叠片单元为单个极片或单张隔膜，由于机械结构限制，导致叠片速度无法实现实质性的提升。因此，叠片工艺还有待进一步改进。
公开内容
有鉴于此，本公开旨在提出一种模切叠片系统，以提高叠片效率。
为达到上述目的，本公开的技术方案是这样实现的：提出一种模切叠片系统，包括：
放卷机构，所述放卷机构包括负极放卷机构、隔膜放卷机构和正极放卷机构，并且所述负极放卷机构和所述正极放卷机构设在所述隔膜放卷机构上下两侧，所述负极放卷机构和所述正极放卷机构交替运行；
极卷裁断机构，所述极卷裁断机构设在所述放卷机构下游，所述极卷裁断机构包括负极裁断机构和正极裁断机构，所述负极裁断机构与所述负极放卷机构配合且裁切负极片，所述正极裁断机构与所述正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；
预热辊压设备，所述预热辊压设备包括依次相连的预热装置和辊压装置，所述预热装置设在所述放卷机构和所述辊压装置之间，所述辊压装置设在所述极卷裁断机构的下游，所述辊压装置使所述叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元和负极叠片单元交替分布的叠片；
检测装置，所述检测装置设在所述预热辊压设备的下游，且检测所述叠片是否存在缺陷；
隔膜裁断机构，所述隔膜裁断机构包括第一隔膜裁断机构和第二隔膜裁断机构，所述第一隔膜裁断机构位于所述第二隔膜裁断机构上游，基于所述检测装置的检测结果，所述第一隔膜裁断机构对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出，所述第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断；
叠片装置，所述叠片装置设在所述隔膜裁断机构的下游，所述叠片装置使所述正极叠片单元和所述负极叠片单元交替叠放。
进一步地，所述叠片装置包括夹爪、第一辅助辊和第二辅助辊，所述夹爪与所述第一辅助辊可移动且与所述第二辅助辊配合使得所述正极叠片单元和所述负极叠片单元铺展对齐且交替叠放。
进一步地，所述放卷机构中，所述负极放卷机构、所述隔膜放卷机构和所述正极放卷机构自上而下分布或自下而上分布。
进一步地，所述模切叠片系统进一步包括多个张力辊，所述多个张力辊设在所述放卷机构和所述极卷裁断机构之间，且在所述负极片、所述隔膜以及所述正极片的上侧和/或下侧间隔分布。
进一步地，所述正极片裁切后的长度小于所述负极片裁切后的长度；相邻的正极叠片单元和负极叠片单元中，所述正极片和所述负极片之间的水平间距为1～6mm。
进一步地，所述模切叠片系统进一步包括排出机，所述排出机设在所述检测装置下游并与所述第一隔膜裁断机构配合，排出有缺陷的叠片单元。
相对于现有技术，本公开所述的模切叠片系统具有以下优势：
(1)本公开所述的模切叠片系统将模切装置和叠片装置集成，一方面取消了上料弹夹，突破弹夹上料限制，另一方面通过预热辊压使得极片与隔膜粘连，叠片上料为卷料而非单片上料，可连续上料，能够突破机械结构限制，提高叠片速度，降低系统故障率；(2)不仅可以大幅减少叠片机的数量，降低设备购置成本并减少设备能耗，还可以使理论叠片速度达到0.25～0.6s/片；(3)隔膜裁断后隔膜边部形态无法保证，在叠片过程中存在隔膜褶皱外漏极片风险，而采用该模切叠片系统进行叠片时，没有缺陷的叠片单元之间的隔膜是不裁断的，仅在叠片结束后才进行裁断，隔膜裁断的次数极少，大大降低了隔膜褶皱外漏极片风险；(4)若将每一个叠片单元均单独裁断后再进行检测和叠片，需要把裁断后的叠片单元转移到定位平台，并经检测装置检测后再转移到叠片平台，即需要再增设一组机械手和一个定位平台，而采用本公开中的模切叠片系统对叠片单元进行检测时，无需再单独增设一个定位平台和一组机械手，结构更为简单；(5)该系统的叠片方式可以为水平叠片，由此可以更有利于叠片对齐，并且系统在垂直方向上的空间占用率更小。
本公开的另一目的在于提出一种利用上述模切叠片系统进行模切叠片的方法，以提高叠片效率。为达到上述目的，本公开的技术方案是这样实现的：提出一种模切叠片的方法，包括：
(1)利用所述放卷机构提供极片和薄膜，使所述负极裁断机构与所述负极放卷机构配合且裁切负极片，使所述正极裁断机构与所述正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；
(2)利用所述预热装置对隔膜和裁切前后的正极片、负极片进行预热，并利用所述辊压装置对所述叠层进行辊压，以便使所述叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元和负极叠片单元交替分布的叠片；
(3)利用所述检测装置检测所述叠片是否存在缺陷，所述第一隔膜裁断机构基于所述检测装置的检测结果对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出；
(4)利用所述叠片装置使所述正极叠片单元和所述负极叠片单元交替叠放，并利用所 述第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断，以便得到极组。
进一步地，所述极组中正极片的长度小于负极片的长度，且负极片的长度比隔膜的长度小0.5～3mm。
进一步地，利用配合使用的所述夹爪、所述第一辅助辊和所述第二辅助辊对叠片单元进行叠放，以便得到所述正极叠片单元和所述负极叠片单元铺展对齐且交替叠放的极组。
进一步地，所述负极片位于所述隔膜上方，所述正极片位于所述隔膜下方，预先将多个所述负极叠片单元和多个所述正极叠片单元交替叠放后，再叠放一层隔膜；或者，所述正极片位于所述隔膜上方，所述负极片位于所述隔膜下方，预先叠放一层隔膜后，再将多个所述正极叠片单元和多个所述负极叠片单元交替叠放。
相对于现有技术，本公开所述的进行模切叠片的方法具有以下优势：
(1)该方法中将极片裁切和叠片耦合，一方面取消了上料弹夹，突破弹夹上料限制，另一方面通过预热辊压使得极片与隔膜粘连，形成叠片单元，叠片上料为卷料而非单片上料，可连续上料，能够突破机械结构限制，提高叠片速度，降低系统故障率；(2)同时对极片和隔膜进行叠片，叠片速度快，理论叠片速度可达到0.25～0.6s/片；(3)隔膜裁断的次数极少，大大降低了隔膜褶皱外漏极片风险；(4)与将每一个叠片单元均单独裁断后再进行检测和叠片相比，对叠片单元进行检测无需转运，工艺更为简单；(5)叠片方式可以为水平叠片，与垂直叠片方式相比，更有利于叠片对齐。
附图说明
构成本公开的一部分的附图用来提供对本公开的进一步理解，本公开的示意性实施例及其说明用于解释本公开，并不构成对本公开的不当限定。在附图中：
图1为本公开一个实施例的模切叠片系统的结构示意图；
图2为本公开一个实施例的正极叠片单元和负极叠片单元交替分布的叠片结构示意图；
图3为本公开一个实施例的采用夹爪和辅助辊对叠片单元进行转运和叠放的示意图；
图4为本公开一个实施例的模切叠片系统采用夹爪夹取叠片单元的示意图。
具体实施方式
需要说明的是，在不冲突的情况下，本公开中的实施例及实施例中的特征可以相互组合。
根据本公开的第一个方面，本公开提出一种模切叠片系统。根据本公开的实施例，如图1所示，该系统包括：放卷机构100、极卷裁断机构200、预热辊压设备300、检测装置400、隔膜裁断机构500和叠片装置600。
下面将参考附图1-4并结合实施例对上述模切叠片系统进行详细描述。
放卷机构100和极卷裁断机构200
根据本公开的实施例，放卷机构100包括负极放卷机构110、隔膜放卷机构120和正极放卷机构130，并且负极放卷机构110和正极放卷机构130设在隔膜放卷机构120上下两侧，负极放卷机构110和正极放卷机构130交替运行；极卷裁断机构200设在放卷机构100下游，极卷裁断机构200包括负极裁断机构210和正极裁断机构220，负极裁断机构210与负极放卷机构110配合且裁切负极片，正极裁断机构220与正极放卷机构130配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层。
根据本公开的实施例，当负极裁断机构110进行裁切作业时，正极放卷机构130暂停放卷，待负极裁断机构210裁切作业完成，负极放卷机构110暂停放卷，正极放卷机构130开始放卷，至正极裁断机构220处进行裁切，待正极裁断机构220完成裁切作业时，正极放卷机构130暂停放卷，负极放卷机构110开始放卷，至负极裁断机构110处进行裁切；如此交替进行，使裁切后的负极片和正极片在隔膜上下两侧交替分布，其中，隔膜放卷机构120相对于负极裁断机构110和/或正极裁断机构130是连续进行的。
根据本公开的一个具体实施例，如图1所示，模切叠片系统可以进一步包括多个张力辊700，多个张力辊700设在放卷机构100和极卷裁断机构200之间，且在负极片、隔膜以及正极片的上侧和/或下侧间隔分布，由此可以更有利于实现极片和隔膜的放卷与启停。
根据本公开的再一个具体实施例，可以综合调节正极放卷机构、负极放卷机构、正极裁断机构和负极裁断机构的放卷和裁切间隔，使得正极片裁切后的长度小于负极片裁切后的长度、相邻的正极叠片单元和负极叠片单元中正极片和负极片之间的水平间距d为1～6mm(如图1所示)，由此可以使最终获得极组中隔膜、负极片和正极片的长度依次减小，例如负极片的长度可以比隔膜的长度小0.5～3mm，确保极组具有较高的安全性和稳定性。需要说明的是，本公开中所述的长度是以极片的运动方向而言的，也可以理解为每个边的长度。
根据本公开的又一个具体实施例，放卷机构100中负极放卷机构110、隔膜放卷机构120和正极放卷机构130可以自上而下分布或自下而上分布，其中，图2为负极放卷机构 110、隔膜放卷机构120和正极放卷机构130自下而上分布时正极叠片单元A和负极叠片单元B交替的示意图。
预热辊压设备300
根据本公开的实施例，预热辊压设备300包括依次相连的预热装置(未单独示出)和辊压装置(未单独示出)，预热装置设在放卷机构100和辊压装置之间，辊压装置设在极卷裁断机构200的下游，辊压装置使叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元A和负极叠片单元B交替分布的叠片。其中，预热装置可以在极片裁切之前就开始对隔膜和正负极片进行预热，由此可以使预热时间更长，从而进一步提高辊压后极片和隔膜的粘连效果；正极叠片单元A包括一层正极片和一层隔膜，负极叠片单元B包括一层负极片和一层薄膜。
检测装置400
根据本公开的实施例，检测装置400设在预热辊压设备300的下游，且检测叠片是否存在缺陷。其中，采用检测装置400可以检测极片位置、尺寸、褶皱、极耳褶皱、折边、缺角等，以便及时舍弃有缺陷的叠片单元；并且，利用检测装置对叠片单元进行检测时，叠片单元无需转运，不用再单独增设一个定位平台和一组机械手，结构更为简单。其中，检测装置400可以为CCD检测机构。
隔膜裁断机构500
根据本公开的实施例，隔膜裁断机构500包括第一隔膜裁断机构510和第二隔膜裁断机构520，第一隔膜裁断机构510位于第二隔膜裁断机构520上游，基于检测装置400的检测结果，第一隔膜裁断机构510对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出，第二隔膜裁断机构520基于叠片层数对最后一个合格的叠片单元进行隔膜裁断。需要说明的是，为了确保后续叠片的准确性，在叠片单元存在缺陷时正极叠片单元和负极叠片单元需要成对排出，例如若一个正极叠片单元存在缺陷，则同时需要再舍弃一个负极叠片单元；另外，在后续叠片过程中，没有缺陷的叠片单元之间的隔膜是不裁断的，仅在叠片结束后才利用第二隔膜裁断机构进行隔膜裁断，由此隔膜裁断的次数极少，大大降低了在叠片过程中存在的隔膜褶皱外漏极片风险。
根据本公开的一个具体实施例，模切叠片系统可以进一步包括排出机800，排出机800可以设在检测装置400的下游并与第一裁断机构510配合，基于检测装置400的显示，排出有缺陷的叠片单元。其中排出机800可以为NG排出机。
叠片装置600
根据本公开的实施例，叠片装置600设在隔膜裁断机构500的下游，叠片装置600使 正极叠片单元A和负极叠片单元B交替叠放，从而得到包括多层正极片和多层负极片的极组。
根据本公开的一个具体实施例，如图1所示或图3所示，叠片装置600可以包括夹爪610、第一辅助辊620和第二辅助辊630，夹爪610与第一辅助辊620可移动且与第二辅助辊630配合使得正极叠片单元A和负极叠片单元B铺展对齐且交替叠放。采用叠片装置对叠片单元进行转运叠片时，夹爪从叠片单元的上下两侧夹取叠片(如图4所示其中，夹爪可以从垂直于极片运动方向的两侧上下夹取叠片)，第一辅助辊和第二辅助辊配合夹爪实现相邻两个叠片单元的叠放，并辅助叠片单元对齐；其中，第二辅助辊的位置相对固定且可以微调，通过调节第一辅助辊和第二辅助辊来控制叠片单元的张力，实现叠片单元的交替叠放和对齐；此外，本公开中采用夹爪配合辅助辊进行叠片的方式为水平叠片，与垂直叠片方式相比，不仅更有利于叠片对齐，而且系统在垂直方向上的空间占用率更小；进一步地，本公开中采用夹爪代替负压机械手实现叠片单元的转运，还可以有效避免吸住叠片单元上侧对叠片单元进行转运时下层极片/隔膜掉落的风险。
根据本公开的再一个具体实施例，叠片装置600中包括两组第一辅助辊620和第二辅助辊630，其中，一组处于工作状态，辅助辊配合夹爪实现相邻两个叠片单元的叠放和对齐，另一组处于准备状态，准备进行下一对叠片单元的叠放和对齐，待相邻两个叠片单元完成叠放和对齐后，处于工作状态的辅助辊撤出并进入准备状态。例如，如图3所示，辅助辊位于准备状态时，第一辅助辊620位于位置1处，第二辅助辊630位于位置2处；当夹爪610夹取叠片单元并将叠片单元转运至叠片位置时，这组辅助辊进入工作状态，第一辅助辊620转移至位置3处，第二辅助辊的位置基本不变，仅在原有位置上进行微调，辅助叠片单元对齐，此时，另一组辅助辊在位置1处和位置2处准备。
根据本公开的又一个具体实施例，当放卷机构100中负极放卷机构110、隔膜放卷机构120和正极放卷机构130自上而下分布时，负极片位于隔膜上方，正极片位于隔膜下方，可以预先将多个负极叠片单元和多个正极叠片单元交替叠放后，再叠放一层隔膜；当放卷机构100中负极放卷机构110、隔膜放卷机构120和正极放卷机构130自下而上分布时，正极片位于隔膜上方，负极片位于隔膜下方，可以预先叠放一层隔膜后，再将多个正极叠片单元和多个负极叠片单元交替叠放。
根据本公开的又一个具体实施例，每一个极组第一层极片均为负极片，以负极放卷机构110、隔膜放卷机构120和正极放卷机构130自上而下分布为例，假设极组共有N层(N为奇数)，则正极为(N-1)/2层，负极为(N+1)/2层，到裁切第(N+1)/2层负极片时正极放卷机构停止放卷，使第(N+1)/2片负极片和第(N+1)/2+1片负极片之间预留有单独 的一段隔膜，待(N+1)/2+1片负极片裁切完成后正极放卷机构继续放卷。叠片完成，第二隔膜裁断机构进行隔膜裁断，隔膜裁断位置为第(N+1)/2+1片负极片右边，距离该极片最右端0.5～3mm。裁断后，将预留的最后一层隔膜覆盖在最后一片负极片上。然后贴固定胶带，最后下料。
综上所述，本公开的模切叠片系统具有以下优势：(1)本公开的模切叠片系统将模切装置和叠片装置集成，一方面取消了上料弹夹，突破弹夹上料限制，另一方面通过预热辊压使得极片与隔膜粘连，叠片上料为卷料而非单片上料，能够突破机械结构限制，提高叠片速度；(2)不仅可以大幅减少叠片机的数量，可连续上料，降低设备购置成本并减少设备能耗，还可以使理论叠片速度达到0.25～0.6s/片；(3)隔膜裁断后隔膜边部形态无法保证，在叠片过程中存在隔膜褶皱外漏极片风险，而采用该模切叠片系统进行叠片时，没有缺陷的叠片单元之间的隔膜是不裁断的，仅在叠片结束后才进行裁断，隔膜裁断的次数极少，大大降低了隔膜褶皱外漏极片风险；(4)若将每一个叠片单元均单独裁断后再进行检测和叠片，需要把裁断后的叠片单元转移到定位平台，并经检测装置检测后再转移到叠片平台，即需要再增设一组机械手和一个定位平台，而采用本公开中的模切叠片系统对叠片单元进行检测时，无需再单独增设一个定位平台和一组机械手，结构更为简单；(5)该系统的叠片方式可以为水平叠片，由此可以更有利于叠片对齐，并且系统在垂直方向上的空间占用率更小。
根据本公开的第二个方面，本公开提出了一种利用上述模切叠片系统进行模切叠片的方法。根据本公开的实施例，参考图1，该方法包括：(1)利用放卷机构提供极片和薄膜，使负极裁断机构与负极放卷机构配合且裁切负极片，使正极裁断机构与正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；(2)利用预热装置对隔膜和裁切前后的正极片、负极片进行预热，并利用辊压装置对叠层进行辊压，以便使叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元和负极叠片单元交替分布的叠片；(3)利用检测装置检测叠片是否存在缺陷，第一隔膜裁断机构基于检测装置的检测结果对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出；(4)利用叠片装置使正极叠片单元和负极叠片单元交替叠放，并利用第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断，以便得到极组。
根据本公开的一个具体实施例，可以利用配合使用的夹爪、第一辅助辊和第二辅助辊对叠片单元进行叠放，以便得到正极叠片单元和负极叠片单元铺展对齐且交替叠放的极组。其中，该叠片方式为水平叠片，与垂直叠片方式相比，不仅更有利于叠片对齐，而且系统在垂直方向上的占用空间更小；进一步地，本公开中采用夹爪代替负压机械手实现叠片单 元的转运，还可以有效避免吸住叠片单元上侧对叠片单元进行转运时下层极片/隔膜掉落的风险。
根据本公开的再一个具体实施例，最终得到的极组中正极片的长度小于负极片的长度，且负极片的长度可以比隔膜的长度小0.5～3mm。由此可以避免极片裸露的风险。
根据本公开的又一个具体实施例，负极片位于隔膜上方，正极片位于隔膜下方时，可以预先将多个负极叠片单元和多个正极叠片单元交替叠放后，再叠放一层隔膜；当正极片位于隔膜上方，负极片位于隔膜下方时，可以预先叠放一层隔膜后，再将多个正极叠片单元和多个负极叠片单元交替叠放。
综上所述，本公开的模切叠片的方法具有以下优势：(1)该方法中将极片裁切和叠片耦合，一方面取消了上料弹夹，突破弹夹上料限制，另一方面通过预热辊压使得极片与隔膜粘连，形成叠片单元，叠片上料为卷料而非单片上料，可连续上料，能够突破机械结构限制，提高叠片速度；(2)同时对极片和隔膜进行叠片，叠片速度快，理论叠片速度可达到0.25～0.6s/片；(3)隔膜裁断的次数极少，大大降低了隔膜褶皱外漏极片风险；(4)与将每一个叠片单元均单独裁断后再进行检测和叠片相比，对叠片单元进行检测无需转运，工艺更为简单；(5)叠片方式可以为水平叠片，与垂直叠片方式相比，更有利于叠片对齐。需要说明的是，上述针对模切叠片系统所描述的特征和效果同样适用于该模切叠片的方法，此处不再一一赘述。
以上所述仅为本公开的较佳实施例而已，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (10)

  1. 一种模切叠片系统，其中，包括：
    放卷机构，所述放卷机构包括负极放卷机构、隔膜放卷机构和正极放卷机构，并且所述负极放卷机构和所述正极放卷机构设在所述隔膜放卷机构上下两侧，所述负极放卷机构和所述正极放卷机构交替运行；
    极卷裁断机构，所述极卷裁断机构设在所述放卷机构下游，所述极卷裁断机构包括负极裁断机构和正极裁断机构，所述负极裁断机构与所述负极放卷机构配合且裁切负极片，所述正极裁断机构与所述正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；
    预热辊压设备，所述预热辊压设备包括依次相连的预热装置和辊压装置，所述预热装置设在所述放卷机构和所述辊压装置之间，所述辊压装置设在所述极卷裁断机构的下游，所述辊压装置使所述叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元和负极叠片单元交替分布的叠片；
    检测装置，所述检测装置设在所述预热辊压设备的下游，且检测所述叠片是否存在缺陷；
    隔膜裁断机构，所述隔膜裁断机构包括第一隔膜裁断机构和第二隔膜裁断机构，所述第一隔膜裁断机构位于所述第二隔膜裁断机构上游，基于所述检测装置的检测结果，所述第一隔膜裁断机构对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出，所述第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断；
    叠片装置，所述叠片装置设在所述隔膜裁断机构的下游，所述叠片装置使所述正极叠片单元和所述负极叠片单元交替叠放。
  2. 根据权利要求1所述的模切叠片系统，其中，所述叠片装置包括夹爪、第一辅助辊和第二辅助辊，所述夹爪与所述第一辅助辊可移动且与所述第二辅助辊配合使得所述正极叠片单元和所述负极叠片单元铺展对齐且交替叠放。
  3. 根据权利要求1或2所述的模切叠片系统，其中，所述放卷机构中，所述负极放卷机构、所述隔膜放卷机构和所述正极放卷机构自上而下分布或自下而上分布。
  4. 根据权利要求1～3中任一项所述的模切叠片系统，其中，进一步包括多个张力辊，所述多个张力辊设在所述放卷机构和所述极卷裁断机构之间，且在所述负极片、所述隔膜以及所述正极片的上侧和/或下侧间隔分布。
  5. 根据权利要求1～4中任一项所述的模切叠片系统，其中，所述正极片裁切后的长度 小于所述负极片裁切后的长度；相邻的正极叠片单元和负极叠片单元中，所述正极片和所述负极片之间的水平间距为1～6mm。
  6. 根据权利要求1～5中任一项所述的模切叠片系统，其中，进一步包括排出机，所述排出机设在所述检测装置下游并与所述第一隔膜裁断机构配合，排出有缺陷的叠片单元。
  7. 一种利用权利要求1-6中任一项所述的系统进行模切叠片的方法，其中，包括：
    (1)利用所述放卷机构提供极片和薄膜，使所述负极裁断机构与所述负极放卷机构配合且裁切负极片，使所述正极裁断机构与所述正极放卷机构配合且裁切正极片，得到负极片和正极片在隔膜上下两侧交替分布的叠层；
    (2)利用所述预热装置对隔膜和裁切前后的正极片、负极片进行预热，并利用所述辊压装置对所述叠层进行辊压，以便使所述叠层的正极片和负极片分别与隔膜粘连，得到正极叠片单元和负极叠片单元交替分布的叠片；
    (3)利用所述检测装置检测所述叠片是否存在缺陷，所述第一隔膜裁断机构基于所述检测装置的检测结果对有缺陷的正/负极叠片单元及相邻的负/正极叠片单元成对进行裁断和排出；
    (4)利用所述叠片装置使所述正极叠片单元和所述负极叠片单元交替叠放，并利用所述第二隔膜裁断机构基于叠片层数对最后一个合格的叠片单元进行隔膜裁断，以便得到极组。
  8. 根据权利要求7所述的方法，其中，所述极组中正极片的长度小于负极片的长度，且负极片的长度比隔膜的长度小0.5～3mm。
  9. 根据权利要求7或8所述的方法，其中，利用配合使用的所述夹爪、所述第一辅助辊和所述第二辅助辊对叠片单元进行叠放，以便得到所述正极叠片单元和所述负极叠片单元铺展对齐且交替叠放的极组。
  10. 根据权利要求7～9中任一项所述的方法，其中，所述负极片位于所述隔膜上方，所述正极片位于所述隔膜下方，预先将多个所述负极叠片单元和多个所述正极叠片单元交替叠放后，再叠放一层隔膜；
    或者，所述正极片位于所述隔膜上方，所述负极片位于所述隔膜下方，预先叠放一层隔膜后，再将多个所述正极叠片单元和多个所述负极叠片单元交替叠放。
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