WO2018205414A1 - 一种复合叠片方法 - Google Patents

一种复合叠片方法 Download PDF

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Publication number
WO2018205414A1
WO2018205414A1 PCT/CN2017/094356 CN2017094356W WO2018205414A1 WO 2018205414 A1 WO2018205414 A1 WO 2018205414A1 CN 2017094356 W CN2017094356 W CN 2017094356W WO 2018205414 A1 WO2018205414 A1 WO 2018205414A1
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separator
unit
positive electrode
layer
layer unit
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PCT/CN2017/094356
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English (en)
French (fr)
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鲁树立
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深圳市格林晟科技有限公司
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Publication of WO2018205414A1 publication Critical patent/WO2018205414A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat 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

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  • the present invention relates to a lithium battery production method, and more particularly to a composite laminate method.
  • the main method of lithium battery production is lamination and winding.
  • the laminating machine automatically realizes the lamination of the positive and negative sheets by the Z-shaped diaphragm of the diaphragm, and the winding machine clamps the pole piece and the diaphragm layer by layer. Rotating and winding on the mandrel, and finally getting the bare cell.
  • the lamination method is easy to be misaligned when it is handled after laminating, and the production efficiency is low; the winding method is complicated and expensive, and the battery capacity is low.
  • the technical problem to be solved by the present invention is to provide a composite lamination method, which effectively solves the problem that the efficiency of the simple lamination is low, and the requirements for the pole piece are high and misaligned.
  • Preparing a first multi-layer unit wherein the first multi-layer unit comprises, in order from bottom to top, a separator, a positive electrode sheet, a separator, and a negative electrode sheet;
  • the second multi-layer unit comprises a separator, a positive electrode sheet, and a separator in order from bottom to top;
  • one of the second multi-layer cells is stacked on the plurality of stacked first multi-layer cells, and the thermocompression bonding all the layers into a whole to obtain bare cells.
  • preparing the first multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator, the positive electrode sheet, the separator and the negative electrode sheet into a whole body during the thermocompression bonding process. unit.
  • the first multi-layer unit is integrally thermoformed to form an integral unit.
  • preparing the second multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator, the positive electrode sheet and the separator into an integral unit during the thermocompression bonding process.
  • Preparing a first multi-layer unit wherein the first multi-layer unit comprises, in order from bottom to top, a separator, a positive electrode sheet and a separator;
  • Preparing a second multi-layer unit wherein the second multi-layer unit comprises a separator and a positive electrode sheet in order from bottom to top;
  • the third multi-layer unit comprises a separator and a positive electrode sheet in order from bottom to top;
  • a second multi-layer unit, an intermediate layer unit and a third multi-layer unit are sequentially stacked from bottom to top, and then thermocompression bonding is performed to bond all the layers into a whole to obtain a bare cell.
  • preparing the first multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked three layers of the separator, the positive electrode sheet and the separator into an integral unit during the thermocompression bonding process.
  • preparing the second multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator and the positive electrode sheet into one integral unit during the thermocompression bonding process.
  • preparing the third multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator and the positive electrode sheet into one integral unit during the thermocompression bonding process.
  • the second multi-layer unit and the third multi-layer unit are integrally thermocompression bonded to form an integral unit.
  • the invention has the beneficial effects that the complicated method for removing the pole piece and the diaphragm is eliminated, and the positive and negative electrode sheets and the diaphragm are directly unrolled and then directly formed into a multi-layer unit or an upper multi-layer unit or a lower multi-layer unit, and a plurality of multi-layer units are stacked.
  • the upper multi-layer unit is thermocompression-bonded to obtain a bare cell, or a plurality of multi-layer cells and a pole piece and a lower/upper layer unit are stacked, and then the bare cell is obtained by thermocompression bonding, the method flow is simplified, and the efficiency is high. .
  • Figure 1 is a schematic illustration of a first embodiment of a composite laminate process of the present invention
  • Figure 3 is a schematic view showing the preparation of the multilayer unit of the first embodiment of the composite lamination method of the present invention
  • FIG. 4 is a schematic view showing the preparation of the upper multi-layer unit of the first embodiment of the composite lamination method of the present invention.
  • Figure 5 is a schematic view showing the stacking principle of the first embodiment of the composite lamination method of the present invention.
  • Figure 2 is a schematic view showing a second embodiment of the composite lamination method of the present invention.
  • Figure 6 is a schematic view showing the preparation of the multilayer unit of the second embodiment of the composite lamination method of the present invention.
  • Figure 7 is a schematic view showing the preparation of the lower multi-layer unit of the second embodiment of the composite lamination method of the present invention.
  • Figure 8 is a schematic view showing the stacking principle of the second embodiment of the composite lamination method of the present invention.
  • Figure 9 is a schematic view showing the preparation of the upper multi-layer unit of the second embodiment of the composite lamination method of the present invention.
  • Figure 10 is a schematic view showing the method of thermal lamination of the multi-layer unit, the lower multi-layer unit and the upper multi-layer unit of the composite lamination method of the present invention.
  • the present invention provides a composite lamination method, the method comprising the steps of: preparing a first multi-layer unit, wherein the first multi-layer unit comprises, in order from bottom to top, a separator, a positive electrode sheet, a separator, and a negative electrode sheet; Preparing a second multi-layer unit, wherein the second multi-layer unit includes a separator, a positive electrode sheet, a separator in order from bottom to top; stacking a plurality of the first multi-layer units; and further one of the second plurality of layers The cells are stacked on top of the plurality of stacked first multi-layer cells, and the thermocompression bonding all the layers into a single body to obtain bare cells.
  • preparing the first multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator, the positive electrode sheet, the separator and the negative electrode sheet into an integral unit in the thermal compression bonding process.
  • the first multi-layer unit is integrally thermoformed to form an integral unit.
  • the preparation of the second multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator, the positive electrode sheet and the separator into an integral unit during the thermocompression bonding process.
  • the present invention provides another composite lamination process, the method comprising the steps of: preparing a first multilayer a unit, wherein the first multilayer unit comprises, in order from bottom to top, a separator, a positive electrode sheet and a separator; and a second multilayer unit, wherein the second multilayer unit comprises a separator and a positive electrode in order from bottom to top.
  • a third multi-layer unit wherein the third multi-layer unit comprises a separator and a positive electrode sheet in order from bottom to top; and a plurality of the first multi-layer unit and the negative electrode sheet are alternately stacked to form an intermediate layer unit; A second multi-layer unit, an intermediate layer unit and a third multi-layer unit are sequentially stacked in the bottom up, and then thermocompression bonding is performed to bond all the layers into a whole to obtain a bare cell.
  • preparing the first multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked three layers of the separator, the positive electrode sheet and the separator into an integral unit during the thermocompression bonding process.
  • the preparation of the second multilayer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator and the positive electrode sheet into one integral unit during the thermocompression bonding process.
  • the preparation of the third multi-layer unit comprises coating a hot melt adhesive on the separator, and bonding the stacked separator and the positive electrode sheet into one integral unit during the thermocompression bonding process.
  • the second multi-layer unit and the third multi-layer unit are integrally thermocompression bonded to form an integral unit.
  • the apparatus for realizing the composite lamination method includes a multi-layer unit preparation mechanism 100, 500, an upper multi-layer unit preparation mechanism 200, 800, and a lower multi-layer unit preparation mechanism 600.
  • the multi-layer unit preparing mechanism 100 is used to prepare a multi-layer unit (or referred to as a first multi-layer unit), which mainly includes a positive sheet unwinding mechanism 101, and a negative sheet unwinding mechanism 102.
  • the multi-layer unit cutting mechanism 106 is responsible for cutting off the preparation of the multi-layer unit in the first embodiment.
  • the separator, the positive electrode sheet, the separator, and the negative electrode sheet are sequentially ordered to the pole piece cutting mechanism 105, and the positive electrode sheet and the negative electrode sheet are respectively cut by the pole piece cutting mechanism 105, and the cut positive electrode sheet and negative electrode sheet are driven by the separator to
  • the thermocompression bonding mechanism 104 the pole piece is bonded to the diaphragm and continues to advance, and the diaphragm is cut at the cutting position of the multilayer unit cutting mechanism 106, so that the multilayer unit 301 is fabricated.
  • the upper multi-layer unit preparation mechanism 200 prepares an upper multi-layer unit (also referred to as a second multi-layer unit), which mainly includes a positive electrode sheet unwinding mechanism 201, a diaphragm unwinding mechanism 202, a positive electrode sheet cutting mechanism 203, and hot pressing
  • the mechanism 204 is an upper multi-layer unit cutting mechanism 205. After the unwinding, the separator, the positive electrode sheet, and the separator are in the order of the positive electrode sheet cutting mechanism 203, the positive electrode sheet is cut by the positive electrode sheet cutting mechanism 203, and the cut positive electrode sheet is driven by the separator to the thermocompression bonding mechanism 204.
  • the upper multi-layer unit 302 is formed by bonding the sheet to the separator and continuing to the cutting position of the upper multi-layer unit cutting mechanism 205 to cut the diaphragm.
  • the multi-layer unit 301 is continuously stacked to the required number of layers, and the uppermost layer of the upper multi-layer unit 302 is stacked, and then enters the thermal compression bonding step 400, after thermocompression bonding.
  • the entire stacked layer is formed in one piece, and the entire lamination process is completed.
  • the multi-layer unit preparing mechanism 500 mainly includes a positive electrode unwinding mechanism 501, a diaphragm unwinding mechanism 502, a positive electrode sheet cutting mechanism 505, a thermal press-fitting mechanism 503, and a multi-layer unit cutting mechanism 504.
  • the positive electrode sheet is transported to the positive electrode sheet cutting mechanism 505, and the cut positive electrode sheet is driven by the diaphragm to the thermal compression mechanism 503.
  • the diaphragm is bonded together and continues to the cutting position of the multilayer unit cutting mechanism 504 to cut the diaphragm, so that the multilayer unit 703 is fabricated.
  • the upper multi-layer unit preparing mechanism 800 mainly includes a single-sided coated positive electrode unwinding mechanism 801, a diaphragm unwinding mechanism 802, a positive electrode sheet cutting mechanism 805, a thermal compression mechanism 803, and an upper multi-layer unit cutting mechanism 804.
  • the positive electrode sheet 801 of the single-sided coating is applied to the positive electrode sheet cutting mechanism 805 according to the separator 802, where the single-sided coated positive electrode sheet is cut, and the cut positive electrode sheet is driven by the separator to hot pressing.
  • the pressed positive electrode sheet is bonded to the separator and continues to the cutting position of the upper multilayer unit cutting mechanism 804 to cut the separator, and the upper multilayer unit 704 is formed.
  • the lower multilayer unit preparation mechanism 600 mainly includes a single-sided coating which is a positive electrode unwinding mechanism 601, a diaphragm unwinding mechanism 602, a positive electrode sheet cutting mechanism 605, a thermal compression mechanism 603, and a lower multilayer unit cutting mechanism 604.
  • a single-sided coating which is a positive electrode unwinding mechanism 601, a diaphragm unwinding mechanism 602, a positive electrode sheet cutting mechanism 605, a thermal compression mechanism 603, and a lower multilayer unit cutting mechanism 604.
  • the film is transported to the positive electrode sheet cutting mechanism 605 in the order of the separator and the single-sided coated positive electrode sheet, the single-sided coated positive electrode sheet is cut, and the cut positive electrode sheet is driven by the separator to the thermocompression bonding mechanism.
  • the pressed positive electrode sheet is bonded to the separator and continues to the cutting position of the lower multilayer unit cutting mechanism 604 to cut the separator, and the lower multilayer unit 701 is formed. Referring to FIG.
  • the lower multi-layer unit 701 is first placed at the bottom layer, and then the negative electrode sheet 702 is alternately placed.
  • the upper multi-layer unit 704 is stacked on the uppermost layer and then enters the existing thermal compression bonding process 400, and the entire stacked layer is formed into a whole after thermocompression bonding. The lamination process is completed.
  • the preparation of the upper multi-layer unit 302 and the multi-layer unit 703 can be made by the two methods shown in FIG. 10, that is, the peripheral thermocompression bonding 901 or the integral thermal compression bonding 902.
  • the multi-layer unit 301, the upper multi-layer unit 704, and the lower multi-layer unit 701 can only be made by integral thermal compression 902. That is to say, the two layers of the separator plus the one pole piece can be made by the peripheral thermal compression 901 or the integral thermal compression 902, and the other structural layers can only be made by the integral thermal compression 902.
  • the invention discards the complicated zigzag lamination method and the winding method, and the pole piece and the diaphragm are formed into a unit of a multi-layer structure by stacking and heat-sealing, and the cells are formed by stacking the units.
  • the utility model has the advantages of simple method, less intermediate links, less land occupation and high production efficiency.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

一种复合叠片方法，该方法包括如下步骤：制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片、隔膜、负极片；制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜、正极片、隔膜；将多个所述第一多层单元堆叠；再将一个所述第二多层单元堆叠在多个已堆叠的所述第一多层单元之上，热压合使所有层粘结成一整体得到裸电芯。所述方法具有制备容易，精度高，转移第一多层单元和第二多层单元堆叠工序容易，容易控制堆叠工序整齐度，消除隔膜张力缺陷，效率高的优点。

Description

一种复合叠片方法 技术领域
本发明涉及锂电池生产方法，尤其是指一种复合叠片方法。
背景技术
目前，锂电池生产主要方法是叠片和卷绕，叠片机将隔膜Z字型摆放自动实现正负极片的叠片，卷绕机则将极片及隔膜按层夹持好后在芯轴上旋转卷绕，最后得到裸电芯。然而叠片方法在叠完贴胶后搬运时容易错位，生产效率较低；卷绕方法设备复杂昂贵，电池容量低。
发明内容
本发明要解决的技术问题在于提供一种复合叠片方法，有效解决了单纯叠片效率较低，对极片要求高，对不齐的问题。
本发明的技术问题是通过以下一种技术方案实现的：提供一种复合叠片方法，该方法包括如下步骤：
制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片、隔膜、负极片；
制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜、正极片、隔膜；
将多个所述第一多层单元堆叠；
再将一个所述第二多层单元堆叠在多个已堆叠的所述第一多层单元之上，热压合使所有层粘结成一整体得到裸电芯。
较佳地，制备所述第一多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜、负极片四层粘结成一个整体单元。
较佳地，所述第一多层单元用整体热压合形成一个整体单元。
较佳地，制备所述第二多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。
本发明的技术问题是通过以下另一种技术方案实现的：提供一种复合叠片方法，该方法包括如下步骤：
制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片及隔膜；
制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜和正极片；
制备第三多层单元，其中，所述第三多层单元从下往上依次包括隔膜和正极片；
将多个所述第一多层单元和负极片交替堆叠形成中间层单元；
从下往上依次将一个第二多层单元、中间层单元及一个第三多层单元堆叠，再热压合使所有层粘结成一整体得到裸电芯。
较佳地，制备所述第一多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。
较佳地，制备所述第二多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。
较佳地，制备所述第三多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。
较佳地，所述第二多层单元及所述第三多层单元用整体热压合形成一个整体单元。
本发明有益效果为：免去输送极片，隔膜的复杂方法，正负极片、隔膜放卷后被直接制成多层单元或上多层单元或下多层单元，堆叠多个多层单元和一个上多层单元后经热压合得到裸电芯，或者堆叠多个多层单元和极片及一个下/上多层单元后经热压合得到裸电芯，方法流程简化，效率高。
附图说明
图1是本发明复合叠片方法的第一实施例的示意图；
图3是本发明复合叠片方法的第一实施例的多层单元制备示意图；
图4是本发明复合叠片方法的第一实施例的上多层单元制备示意图；
图5是本发明复合叠片方法的第一实施例的堆叠原理示意图；
图2是本发明复合叠片方法的第二实施例的示意图；
图6是本发明复合叠片方法的第二实施例的多层单元制备示意图；
图7是本发明复合叠片方法的第二实施例的下多层单元制备示意图；
图8是本发明复合叠片方法的第二实施例的堆叠原理示意图；
图9是本发明复合叠片方法的第二实施例的上多层单元制备示意图；
图10是本发明复合叠片方法多层单元，下多层单元，上多层单元热压合方法示意图。
具体实施方式
本发明提供了一种复合叠片方法，该方法包括如下步骤：制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片、隔膜、负极片；制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜、正极片、隔膜；将多个所述第一多层单元堆叠；再将一个所述第二多层单元堆叠在多个已堆叠的所述第一多层单元之上，热压合使所有层粘结成一整体得到裸电芯。此外，制备所述第一多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜、负极片四层粘结成一个整体单元。所述第一多层单元用整体热压合形成一个整体单元。制备所述第二多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。
本发明提供了另一种复合叠片方法，该方法包括如下步骤：制备第一多层 单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片及隔膜；制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜和正极片；制备第三多层单元，其中，所述第三多层单元从下往上依次包括隔膜和正极片；将多个所述第一多层单元和负极片交替堆叠形成中间层单元；从下往上依次将一个第二多层单元、中间层单元及一个第三多层单元堆叠，再热压合使所有层粘结成一整体得到裸电芯。其中，制备所述第一多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。制备所述第二多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。制备所述第三多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。所述第二多层单元及所述第三多层单元用整体热压合形成一个整体单元。
如图1至图10所示，实现该复合叠片方法的装置包括：多层单元制备机构100,500，上多层单元制备机构200，800，下多层单元制备机构600。多层单元和上多层单元堆叠方式300，下多层单元\多层单元\极片及上多层单元堆叠方式700，热压合工序400。
在第一实施例中，该多层单元制备机构100用于制备多层单元(或称为第一多层单元)，其主要包括，正极片放卷切断机构101，负极片放卷切断机构102，隔膜放卷机构103，极片切断机构105，热压合机构104，以及多层单元切断机构106。该多层单元切断机构106负责切断制备第一实施例中的多层单元。放卷后依隔膜，正极片，隔膜，负极片的次序至该极片切断机构105，正极片和负极片分别被该极片切断机构105切断，切断后的正极片和负极片被隔膜带动到该热压合机构104，极片与隔膜粘结在一起并继续前行，至该多层单元切断机构106的切断位置切断隔膜，这样，该多层单元301被制成。
该上多层单元制备机构200制备上多层单元(或称为第二多层单元)，其主要包括正极片放卷机构201，隔膜放卷机构202，正极片切断机构203，热压 合机构204，上多层单元切断机构205。放卷后依隔膜，正极片，隔膜的次序至该正极片切断机构203处，正极片被该正极片切断机构203切断，切断后的正极片被隔膜带动到热压合机构204处，该正极片与隔膜粘结在一起并继续前行至该上多层单元切断机构205的切断位置将隔膜切断，该上多层单元302被制成。在该多层单元和上多层单元堆叠方式300中，该多层单元301被连续堆叠到要求层数，最上一层叠一片该上多层单元302后进入热压合工序400，热压合后整个堆叠层形成一个整体，整个叠片工序完成。
在第二实施例中，该多层单元制备机构500主要包括正极片放卷机构501，隔膜放卷机构502，正极片切断机构505，热压合机构503，多层单元切断机构504。放卷后依隔膜，正极片，隔膜的次设置，该正极片被输送至该正极片切断机构505处被切断，切断后的正极片被隔膜带动到热压合机构503处，该正极片与隔膜粘结在一起并继续前行至该多层单元切断机构504的切断位置将隔膜切断，这样，该多层单元703被制成。
该上多层单元制备机构800主要包括单面涂布的正极片放卷机构801，隔膜放卷机构802，正极片切断机构805，热压合机构803，上多层单元切断机构804。放卷后依隔膜802，单面涂布的正极片801的次序至该正极片切断机构805，在此处该单面涂布的正极片被切断，切断后的正极片被隔膜带动到热压合机构803处，压合后的该正极片与隔膜粘结在一起并继续前行至该上多层单元切断机构804的切断位置将隔膜切断，该上多层单元704被制成。
该下多层单元制备机构600主要包括单面涂布是正极片放卷机构601，隔膜放卷机构602，正极片切断机构605，热压合机构603，下多层单元切断机构604。放卷后依隔膜、单面涂布的正极片的次序输送至该正极片切断机构605处，该单面涂布的正极片被切断，切断后的正极片被隔膜带动到该热压合机构603处，压合后的该正极片与隔膜粘结在一起并继续前行至该下多层单元切断机构604的切断位置将隔膜切断，该下多层单元701被制成。参见图8，在堆叠方式700中，先在最底层放置该下多层单元701，接着交替放置负极片702 和多层单元703并堆叠在一起，达到要求的层数后，在最上面叠放该上多层单元704后进入现有的热压合工序400中，热压合后整个堆叠层形成一个整体，叠片工序完成。
该上多层单元302、多层单元703的制备可以采用图10所示两种方法，即周边热压合901或整体热压合902的方式制成。该多层单元301、该上多层单元704以及下多层单元701只能用整体热压合902的方式制成。也就是说，两层隔膜加上一层极片可以用周边热压合901或整体热压合902的方式制成，其他结构层只能用整体热压合902的方式制成。
本发明舍弃复杂的Z字型叠片方法和卷绕方法，将极片和隔膜通过堆叠和热合制成一个个多层结构的单元，再通过堆叠这些单元的方式形成电芯。具有方法简单，中间环节少，占地少，生产效率高的优点。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明，不能认定本发明的具体实施只局限于这些说明。对于本发明所属技术领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干简单推演或替换，都应当视为属于本发明的保护范围。如正负极与隔膜的不同次序，如极片不放卷而是在其它工序制备好，直接自动夹取放在隔膜中间进入热压合形成多层单元或上/下多层单元都属于本发明的保护范围。

Claims (9)

  1. 一种复合叠片方法，该方法包括如下步骤：
    制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片、隔膜、负极片；
    制备第二多层单元，其中，所述第二多层单元从下往上依次包括隔膜、正极片、隔膜；
    将多个所述第一多层单元堆叠；
    再将一个所述第二多层单元堆叠在多个已堆叠的所述第一多层单元之上，热压合使所有层粘结成一整体得到裸电芯。
  2. 如权利要求1所述的一种复合叠片方法，其特征在于，制备所述第一多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜、负极片四层粘结成一个整体单元。
  3. 如权利要求2所述的一种复合叠片方法，其特征在于，所述第一多层单元用整体热压合形成一个整体单元。
  4. 如权利要求1所述的一种复合叠片方法，其特征在于，制备所述第二多层单元包括在隔膜均上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。
  5. 一种复合叠片方法，该方法包括如下步骤：
    制备第一多层单元，其中，所述第一多层单元从下往上依次包括：隔膜、正极片及隔膜；
    制备第二多层单元，其中，所述第二多层单元从下往上依次包括正极片和隔膜；
    制备第三多层单元，其中，所述第三多层单元从下往上依次包括隔膜和正极片；
    将多个所述第一多层单元和负极片交替堆叠形成中间层单元；
    从下往上依次将一个第二多层单元、中间层单元及一个第三多层单元堆叠， 再热压合使所有层粘结成一整体得到裸电芯。
  6. 如权利要求5所述的一种复合叠片方法，其特征在于，制备所述第一多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片、隔膜三层粘结成一个整体单元。
  7. 如权利要求5所述的一种复合叠片方法，其特征在于，制备所述第二多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。
  8. 如权利要求5所述的一种复合叠片方法，其特征在于，制备所述第三多层单元包括在隔膜上涂覆热熔胶，在热压合过程中将所堆叠后的隔膜、正极片两层粘结成一个整体单元。
  9. 如权利要求1所述的一种复合叠片方法，其特征在于，所述第二多层单元及所述第三多层单元用整体热压合形成一个整体单元。
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