WO2020057502A1 - 极片成型装置及极片成型方法 - Google Patents

极片成型装置及极片成型方法 Download PDF

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Publication number
WO2020057502A1
WO2020057502A1 PCT/CN2019/106194 CN2019106194W WO2020057502A1 WO 2020057502 A1 WO2020057502 A1 WO 2020057502A1 CN 2019106194 W CN2019106194 W CN 2019106194W WO 2020057502 A1 WO2020057502 A1 WO 2020057502A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
forming device
pole
roller
die
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PCT/CN2019/106194
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English (en)
French (fr)
Inventor
禹如初
张涛
廖能武
吴铁锋
黄相强
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2020057502A1 publication Critical patent/WO2020057502A1/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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to the field of battery production, in particular to a pole piece forming device and a pole piece forming method.
  • the pole piece of a secondary battery includes a base material and an active material layer coated on the surface of the base material.
  • it is usually necessary to cut the area of the base material not covered by the active material layer to form the pole piece. Ears.
  • the substrate is thin (usually more than ten microns), during the transport of the pole piece, the area of the substrate that is not covered by the active material layer is prone to bend and wrinkle, resulting in the cutting position. Error affects the quality of the pole piece.
  • an object of the present invention is to provide a pole piece forming device and a pole piece forming method, which can ensure the cutting quality of pole pieces and improve the excellent rate of pole pieces.
  • the present invention provides a pole piece forming device, which includes an unwinding mechanism, a rolling mechanism, a die cutting mechanism, and a winding mechanism.
  • the unwinding mechanism, the rolling mechanism, the die cutting mechanism, and the winding mechanism are arranged in order along the direction of the pole piece.
  • the unwinding mechanism is used to set the pole piece
  • the die cutting mechanism is used to cut the pole piece
  • the winding mechanism is used for winding.
  • the rolling mechanism includes a first pressing roller and a second pressing roller opposite to each other. The surface of the second pressing roller is provided with a protrusion, and the pole piece passes between the first pressing roller and the second pressing roller.
  • the second pressure roller is two and is arranged along the axial direction of the first pressure roller.
  • the second pressure roller is a spur gear.
  • the die cutting mechanism is a laser die cutting mechanism.
  • the die-cutting mechanism is a group and is opposite to two ends of the pole piece in the transverse direction.
  • the pole piece forming device further includes a slitting mechanism, which is arranged between the die cutting mechanism and the winding mechanism and is used to divide the pole piece into two.
  • the slitting mechanism includes a mounting frame and The first cutting roll and the second cutting roll of the mounting frame, and the pole pieces can pass between the first cutting roll and the second cutting roll.
  • the pole piece forming device further includes a CCD detection mechanism for detecting pole pieces cut by a die cutting mechanism and pole pieces cut by a slitting mechanism.
  • the pole piece forming device further includes a tension adjustment mechanism provided between the unwinding mechanism and the winding mechanism.
  • the tension adjustment mechanism includes a roller and a tension sensor provided on the roller.
  • the pole piece forming device further includes a wrinkle removing brush disposed between the unwinding mechanism and the die cutting mechanism; the wrinkle removing brush is opposite to the pole piece and is inclined with respect to the lateral direction of the pole piece.
  • the present invention also provides a method for forming a pole piece, which comprises: setting a pole piece with a blank area on a unwinding mechanism; and pulling the pole piece through a rolling mechanism, where the rolling mechanism is A convex rib is pressed in the blank area of the pole piece; the pressed pole piece is pulled through a die cutting mechanism, and the die cutting mechanism cuts the blank area of the pressed pole piece, thereby forming A pole piece; a winding mechanism rolls up a pole piece behind the pole piece.
  • the "pulling the pole piece through a rolling mechanism, said rolling mechanism pressing a convex rib in the blank area of the pole piece” includes: pulling the pole piece through two sets of the rolling mechanism The two sets of roller pressing mechanisms press out convex ribs protruding in opposite directions in the blank areas of the pole pieces.
  • the beneficial effects of the present invention are as follows: when the pole pieces need to be cut on the pole piece, the pole piece is first set on a unwinding mechanism, and then the free end of the traction pole piece passes through the rolling mechanism and the die cutting mechanism in order, and is finally fixed to the The winding shaft of the winding mechanism, the winding mechanism drives the pole piece to carry.
  • the pole piece passes between the first pressing roller and the second pressing roller, the protrusion of the second pressing roller squeezes the blank space along the lateral outer end of the pole piece, thereby pressing out the ribs in the blank area.
  • the die-cutting mechanism cuts a blank area of the pole piece, so as to form a pole ear of a desired shape on the pole piece.
  • the pole piece forming device of the present application can form convex ribs in the blank area of the pole piece, thereby improving the strength of the blank area, avoiding bending and wrinkling of the blank area, ensuring the cutting quality of the pole ear, and improving the superiority of the pole piece.
  • FIG. 1 is a schematic diagram of a pole piece forming apparatus according to the present invention.
  • FIG. 2 is a schematic diagram of a rolling mechanism of a pole piece forming apparatus according to the present invention.
  • FIG. 3 is a schematic diagram of the second pressing roller of FIG. 2.
  • FIG. 4 is a schematic diagram of pole pieces on a unwinding mechanism.
  • FIG. 5 is a cross-sectional view of a blank area of a pole piece after passing through a rolling mechanism.
  • FIG. 6 is a schematic diagram of a pole piece after passing through a die cutting mechanism.
  • FIG. 7 is a schematic diagram of a pole piece after passing through a slitting mechanism.
  • FIG. 8 is a schematic diagram of a pole piece and a wrinkle removing brush.
  • the first cutting roller P3 pole ears
  • the pole piece forming apparatus of the present application includes an unwinding mechanism 1, a rolling mechanism 2, a die cutting mechanism 3, and a winding mechanism 4.
  • the unwinding mechanism 1, the roll pressing mechanism 2, the die cutting mechanism 3, and the winding mechanism 4 are sequentially arranged along the direction of travel of the pole piece P.
  • the unwinding mechanism 1 is used to set the pole piece P
  • the die cutting mechanism 3 is used to cut the pole piece.
  • the sheet P and the winding mechanism 4 are used for winding the pole pieces P.
  • the rolling mechanism 2 includes a first pressing roller 21 and a second pressing roller 22 opposite to each other.
  • the surface of the second pressing roller 22 is provided with a protrusion 221, and the pole piece P is located between the first pressing roller 21 and the second pressing roller 22.
  • the unwinding mechanism 1 may include a unwinding roller, and the pole piece P to be processed may be wound on the unwinding roller.
  • the pole piece P to be processed generally includes a substrate and an active material layer coated on a surface of the substrate.
  • the substrate may be an aluminum foil or a copper foil.
  • the area covered by the active material layer of the base material and the active material layer together constitute the coating area P1 of the pole piece P.
  • the area of the base material not covered by the active material layer is the blank area P2, and the blank area P2 and The coating areas P1 are arranged at X intervals in the lateral direction.
  • two ends of the pole piece P in the transverse direction X are blank areas P2.
  • the pole piece P3 When the pole piece P3 needs to be cut on the pole piece P, the pole piece P is first set on the unwinding mechanism 1, and then the free end of the pole piece P is pulled through the rolling mechanism 2 and the die cutting mechanism 3 in order, and finally fixed to The winding shaft of the winding mechanism 4, the winding mechanism 4 drives the pole piece P to carry the tape.
  • the protrusion 221 of the second pressure roller 22 presses the blank area P2 of the outer end of the pole piece P in the lateral direction X, so that the blank area P
  • the convex rib T is pressed by P2 (the convex rib T is convex with respect to one surface of the blank area P2 and is concave with respect to one surface of the blank area P2).
  • the die-cutting mechanism 3 cuts a blank area P2 of the pole piece P, so as to form the pole piece P3 in a desired shape on the pole piece P.
  • the pole piece forming device of the present application can form a rib T in the blank area P2 of the pole piece P, thereby improving the strength of the blank area P2, avoiding bending and wrinkling of the blank area P2, ensuring the cutting quality of the pole ear P3, and improving the pole The probabilities of tablets P.
  • the second pressing roller 22 is two and is arranged along the axial direction of the first pressing roller 21. Each second pressing roller 22 is used for rolling a corresponding blank area P2.
  • the die-cutting mechanism 3 is a laser die-cutting mechanism.
  • the laser die-cutting mechanism emits laser light to the blank area P2 of the pole piece P, and the laser cuts a part of the blank area P2 to form a pole ear P3.
  • the rolling mechanism 2 is two sets and is arranged along the direction of the pole piece P, and the two surfaces of the pole piece P face the second pressing roller 22 of the two sets of rolling mechanism 2 respectively; when the pole piece P passes through the two sets of rollers, After pressing the mechanism 2, the protruding ribs T rolled out by the two sets of roller pressing mechanisms 2 protrude in opposite directions, respectively.
  • the rib T needs to have a large depth, which will easily damage the blank area P2.
  • the depth of the rib T is large, it will also cause the laser focal length The fluctuation is large, which affects the laser die cutting.
  • the use of two sets of rolling mechanisms 2 can reduce the depth requirements of the convex ribs T, make the convex ribs T more uniform, and facilitate the laser die cutting.
  • the second pressure roller 22 is a spur gear.
  • the spur gear can continuously press the rib T on the blank area P2.
  • the number of die-cutting mechanisms 3 depends on the demand.
  • the die-cutting mechanism 3 is a group, and the die-cutting mechanism 3 may have multiple laser heads.
  • the laser heads simultaneously emit laser light toward the blank areas P2 at both ends of the pole piece P in the transverse X direction, so that two are cut out simultaneously.
  • the die-cutting mechanisms 3 are two groups and are arranged in order along the direction of travel of the pole piece P.
  • the two sets of die-cutting mechanisms 3 are opposite to the two ends of the pole piece P in the transverse direction X;
  • the pole piece P is cut in steps, that is, a die cutting mechanism 3 first cuts out the pole ear P3 at one end of the pole piece P in the transverse X direction, and the other die cutting mechanism 3 then cuts the pole piece P in the transverse X direction. The other end is cut out of the pole ear P3.
  • the pole piece forming device further includes a slitting mechanism 5 disposed between the die cutting mechanism 3 and the winding mechanism 4.
  • the pole piece P passes through the slitting mechanism 5, the slitting mechanism 5
  • the pole piece P is divided into two; the winding mechanism 4 is divided into two groups, and is used to roll up the two pole pieces P, respectively.
  • Each pole piece P can be used to prepare a secondary battery.
  • the slitting mechanism 5 includes a mounting frame 51 and first and second cutting rollers 52 and 53 provided on the mounting frame 51.
  • the pole piece P can pass between the first and second cutting rollers 52 and 53.
  • Each of the first cutting roll 52 and the second cutting roll 53 has a cutter, and the cutter cuts from the middle of the coating area P1 of the pole piece P.
  • the die-cutting process of the pole P3 and the slitting process of the pole piece P are respectively implemented in different equipment, and the present application integrates the two processes to effectively improve production efficiency, save costs and time .
  • the pole piece forming device further includes a CCD (Charge Coupled Device) detection mechanism 6 for detecting the pole pieces P cut by the die cutting mechanism 3 and the pole pieces P cut by the slitting mechanism 5.
  • the CCD detection mechanism 6 can detect whether the pole ear P3 die-cut by the die-cutting mechanism 3 is accurate, so as to feedback control the pole piece forming device. Similarly, the CCD detection mechanism 6 can also detect whether the cutting position of the slitting mechanism 5 is accurate at the same time.
  • the die cutting process of the pole P3 and the slitting process of the pole piece P are respectively implemented in different equipment, and each process requires a corresponding CCD detection mechanism 6; and this application integrates the two processes together Therefore, a part of the CCD detection mechanism 6 can be saved.
  • the pole piece forming device further includes a tension adjustment mechanism 7 provided between the unwinding mechanism 1 and the winding mechanism 4.
  • the tension adjustment mechanism 7 includes a roller 71 and a tension sensor 72 provided on the roller 71.
  • the unwinding mechanism 1 and the rewinding mechanism 4 may be connected to the magnetic powder brake, and the tension sensor 72 and the magnetic powder brake form closed-loop control.
  • the tension sensor 72 detects a deviation in the tension of the pole piece P on the roller 71, it directly feedback controls the magnetic powder brake, and the magnetic powder brake adjusts the rotation speed of the unwinding shaft or the winding shaft, thereby adjusting the tension of the pole piece P.
  • the tension adjustment mechanism 7 of the present application has a simple structure and convenient layout. There may be a plurality of tension adjusting mechanisms 7 provided upstream of the rolling mechanism 2 and upstream of the winding mechanism 4 respectively.
  • the pole piece forming device further includes a wrinkle removing brush 8 disposed between the unwinding mechanism 1 and the die cutting mechanism 3; the wrinkle removing brush 8 is opposite to the pole piece P and is opposite to the pole piece
  • the lateral X of P is inclined. Specifically, when the pole piece P is transported, the wrinkle removing brush 8 is in contact with the blank area P2 of the pole piece P. Referring to FIG. 8, the contact area between the wrinkle removing brush 8 and the blank area P2 is inclined relative to the lateral X of the pole piece P . When the pole piece P passes through the wrinkle removing brush 8, the wrinkle removing brush 8 rolls the blank area P2, thereby achieving the wrinkle removing effect.
  • the pole piece forming device further includes a guide roller provided on a transport path of the pole piece P, a deviation correcting mechanism 9, a belt receiving platform A, and a dust removing brush B.
  • the guide rollers are plural and guide the pole pieces P to be transported.
  • the deviation correcting mechanism 9 corrects the pole piece P to ensure that the pole piece P is located at the center of each roller.
  • the tapping platform A is disposed downstream of the unwinding mechanism 1. When the pole piece P needs to be replaced, the new and old pole pieces P can be connected to the tapping platform A.
  • the dust removing brush B is disposed between the slitting mechanism 5 and the winding mechanism 4 and is used to remove impurities on the surface of the pole piece P.
  • the present application also provides a pole piece forming method, which can improve the superiority of the pole piece.
  • the pole piece forming method specifically includes the following steps:
  • the traction pole piece P passes through the rolling mechanism 2, and the rolling mechanism 2 presses the rib T in the blank area P2 of the pole piece P;
  • the winding mechanism 4 winds up the pole piece P after forming the pole ear P3.
  • the pole piece forming method provided in the present application can form convex ribs in the blank area of the pole piece, thereby improving the strength of the blank area, avoiding bending and wrinkling of the blank area, ensuring the cutting quality of the pole ear, and improving the superiority of the pole piece.
  • the “traction pole piece P passes through the rolling mechanism 2 and the rolling mechanism 2 presses the rib T in the blank area P2 of the pole piece P” includes: the traction pole piece P passes through two sets of the rolling mechanism 2, and the two The group rolling mechanism 2 presses the ribs T protruding in opposite directions in the blank area P2 of the pole piece P, respectively.
  • the rib T needs to have a large depth, which will easily damage the blank area P2. At the same time, if the depth of the rib T is large, it will also cause the laser focal length The fluctuation is large, which affects the laser die cutting.
  • the use of two sets of rolling mechanisms 2 can reduce the depth requirements of the ribs T, make the ribs T more uniform, and facilitate laser cutting.

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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)
  • Battery Electrode And Active Subsutance (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

一种极片成型装置及极片成型方法。极片成型装置包括放卷机构（1）、辊压机构（2）、模切机构（3）以及收卷机构（4）。放卷机构（1）、辊压机构（2）、模切机构（3）和收卷机构（4）沿极片（P）的走带方向依次设置，放卷机构（1）用于设置极片（P），模切机构（3）用于裁切极片（P），收卷机构（4）用于收卷极片（P）。辊压机构包括相对设置的第一压辊（21）和第二压辊（22），第二压辊（22）的表面设有突起，且极片（P）从第一压辊（21）和第二压辊（22）之间穿过。

Description

极片成型装置及极片成型方法 技术领域
本发明涉及电池生产领域，尤其涉及一种极片成型装置及极片成型方法。
背景技术
二次电池的极片包括基材和涂覆于基材表面的活性物质层，而在极片的成型过程中，通常需要裁切基材的未被活性物质层覆盖的区域，以形成极片的极耳。但是，由于基材较薄(通常为十几微米)，所以在极片的走带过程中，基材的未被活性物质层覆盖的区域容易出现弯折、打皱，导致裁切的位置出现误差，影响极片的质量。
发明内容
鉴于背景技术中存在的问题，本发明的目的在于提供一种极片成型装置及极片成型方法，其能保证极耳的裁切质量，提高极片的优率。
为了实现上述目的，本发明提供了一种极片成型装置，其包括放卷机构、辊压机构、模切机构以及收卷机构。放卷机构、辊压机构、模切机构和收卷机构沿极片的走带方向依次设置，放卷机构用于设置极片，模切机构用于裁切极片，收卷机构用于收卷极片。辊压机构包括相对设置的第一压辊和第二压辊，第二压辊的表面设有突起，且极片从第一压辊和第二压辊之间穿过。
第二压辊为两个且沿第一压辊的轴向布置。第二压辊为直齿轮。
辊压机构为两组且沿极片的走带方向设置，且极片的两个表面分别朝向两组辊压机构的第二压辊。
模切机构为激光模切机构。在一实施例中，模切机构为一组且与极片沿横向的两端相对。在另一实施例中，模切机构为两组且沿极片的走带方向依次设置，两组模切机构分别与极片沿横向的两端相对。
收卷机构为两组，所述极片成型装置还包括分切机构，设置于模切机构 和收卷机构之间且用于将极片分割为两条；分切机构包括安装架以及设置于安装架的第一切割辊和第二切割辊，极片能够从第一切割辊和第二切割辊之间穿过。
所述极片成型装置还包括CCD检测机构，用于检测经过模切机构裁切的极片以及经过分切机构裁切的极片。
所述极片成型装置还包括设置于放卷机构和收卷机构之间的张力调节机构，张力调节机构包括辊轮以及设置于辊轮的张力传感器。
所述极片成型装置还包括除皱毛刷，设置于放卷机构和模切机构之间；除皱毛刷与极片相对且相对于极片的横向倾斜。
为了实现上述目的，本发明还提供了一种极片成型方法，其包括：将具有空白区的极片设置于放卷机构；牵引所述极片穿过辊压机构，所述辊压机构在所述极片的所述空白区压制出凸筋；牵引所述压制后的极片穿过模切机构，所述模切机构裁切所述压制后的极片的所述空白区，从而形成极耳；收卷机构收卷形成所述极耳后的极片。
所述“牵引所述极片穿过辊压机构，所述辊压机构在所述极片的所述空白区压制出凸筋”包括：牵引所述极片穿过两组所述辊压机构，所述两组辊压机构在所述极片的空白区压制出分别朝相反的方向突出的凸筋。
本发明的有益效果如下：当需要在极片上裁切极耳时，先将极片设置在放卷机构，然后牵引极片的自由端依次穿过辊压机构和模切机构，最终固定到收卷机构的收卷轴，收卷机构带动极片走带。极片从第一压辊和第二压辊之间穿过时，第二压辊的突起挤压极片沿横向外端的空白区，从而在空白区压制出凸筋。极片穿过模切机构时，模切机构裁切极片的空白区，从而在极片上形成所需形状的极耳。本申请的极片成型装置能够在极片的空白区形成凸筋，从而提高空白区的强度，避免空白区弯折、打皱，保证极耳的裁切质量，提高极片的优率。
附图说明
图1为根据本发明的极片成型装置的示意图。
图2为根据本发明的极片成型装置的辊压机构的示意图。
图3为图2的第二压辊的示意图。
图4为放卷机构上的极片的示意图。
图5为极片的空白区在经过辊压机构后的断面图。
图6为极片经过模切机构之后的示意图。
图7为极片经过分切机构之后的示意图。
图8为极片和除皱毛刷的示意图。
其中，附图标记说明如下：
1放卷机构                      71辊轮
2辊压机构                      72张力传感器
21第一压辊                     8除皱毛刷
22第二压辊                     9纠偏机构
221突起                        A接带平台
3模切机构                      B除尘毛刷
4收卷机构                      P极片
5分切机构                      P1涂覆区
51安装架                       P2空白区
52第一切割辊                   P3极耳
53第二切割辊                   T凸筋
6CCD检测机构                   X横向
7张力调节机构                  Y纵向
具体实施方式
参照图1，本申请的极片成型装置包括放卷机构1、辊压机构2、模切机构3以及收卷机构4。放卷机构1、辊压机构2、模切机构3和收卷机构4沿极片P的走带方向依次设置，放卷机构1用于设置极片P，模切机构3用于裁切极片P，收卷机构4用于收卷极片P。辊压机构2包括相对设置的第一压辊21和第二压辊22，第二压辊22的表面设有突起221，且极片P从第一压辊21和第二压辊22之间穿过。
放卷机构1可包括放卷辊，待处理的极片P可卷绕在放卷辊上。所述待处理的极片P通常包括基材和涂覆于基材表面的活性物质层，基材可为铝箔或铜箔。参照图4，基材的被活性物质层覆盖的区域以及活性物质层共同组 成极片P的涂覆区P1，基材的未被活性物质层覆盖的区域即为空白区P2，空白区P2和涂覆区P1沿横向X间隔设置。优选地，极片P沿横向X的两端为空白区P2。
当需要在极片P上裁切极耳P3时，先将极片P设置在放卷机构1，然后牵引极片P的自由端依次穿过辊压机构2和模切机构3，最终固定到收卷机构4的收卷轴，收卷机构4带动极片P走带。
参照图5，极片P从第一压辊21和第二压辊22之间穿过时，第二压辊22的突起221挤压极片P沿横向X外端的空白区P2，从而在空白区P2压制出凸筋T(凸筋T相对于空白区P2的一个表面凸出，相对于空白区P2的一个表面凹陷)。参照图6，极片P穿过模切机构3时，模切机构3裁切极片P的空白区P2，从而在极片P上形成所需形状的极耳P3。
本申请的极片成型装置能够在极片P的空白区P2形成凸筋T，从而提高空白区P2的强度，避免空白区P2弯折、打皱，保证极耳P3的裁切质量，提高极片P的优率。
由于极片P沿横向X的两端均为空白区P2，因此，参照图2，第二压辊22为两个且沿第一压辊21的轴向布置。各第二压辊22用于辊压对应的一个空白区P2。
模切机构3为激光模切机构。激光模切机构向极片P的空白区P2发射激光，激光切除空白区P2的一部分，进而形成极耳P3。
辊压机构2为两组且沿极片P的走带方向设置，且极片P的两个表面分别朝向两组辊压机构2的第二压辊22；当极片P穿过两组辊压机构2后，两组辊压机构2辊压出的凸筋T分别朝相反的方向突出。如果采用单个辊压机构2，那么为了保证空白区P2的强度，凸筋T需要具有较大的深度，而这容易损伤空白区P2；同时，如果凸筋T深度较大，还会导致激光焦距的波动较大，影响激光模切。而采用两组辊压机构2，可以减小凸筋T的深度要求，使压制出凸筋T更为均匀，同时便于实现激光模切。
第二压辊22为直齿轮。直齿轮可在空白区P2上连续地压制凸筋T。
模切机构3的数量依需求而定。在一实施例中，模切机构3为一组，模切机构3可具有多个激光头，激光头同时向极片P沿横向X两端的空白区P2发射激光，从而同步裁切出两个极耳P3。在另一实施例中，参照图1，模 切机构3为两组且沿极片P的走带方向依次设置，两组模切机构3分别与极片P沿横向X的两端相对；本实施例对极片P进行分步裁切，即一个模切机构3先在极片P沿横向X的一端裁切出极耳P3，另一个模切机构3再在极片P沿横向X的另一端裁切出极耳P3。
参照图4，为了提高极片P的生产效率，极片P在涂布工艺(即在基材的表面涂覆活性物质层)中会形成一个具有较大宽度的涂覆区P1，涂覆区P1沿横向X的两端为空白区P2。参照图1和图7，所述极片成型装置还包括分切机构5，设置于模切机构3和收卷机构4之间，当极片P从分切机构5穿过时，分切机构5将极片P分割为两条；收卷机构4为两组，且分别用于收卷所述两条极片P。各条极片P均可用于制备二次电池。
具体地，分切机构5包括安装架51以及设置于安装架51的第一切割辊52和第二切割辊53，极片P能够从第一切割辊52和第二切割辊53之间穿过。第一切割辊52和第二切割辊53均具有切刀，切刀从极片P的涂覆区P1的中部进行切割。
在现有技术中，极耳P3的模切工序和极片P的分切工序分别在不同的设备中实现，而本申请将两个工序集成在一起，有效地提高生产效率、节省成本和时间。
参照图1，所述极片成型装置还包括CCD(Charge Coupled Device)检测机构6，用于检测经过模切机构3裁切的极片P以及经过分切机构5裁切的极片P。CCD检测机构6能够检测模切机构3模切出的极耳P3是否准确，从而反馈控制极片成型装置；同样地，CCD检测机构6还能同时检测分切机构5分切的位置是否准确。在现有技术中，极耳P3的模切工序和极片P的分切工序分别在不同的设备中实现，各工序都需要对应的CCD检测机构6；而本申请将两个工序集成在一起，从而可以节省部分的CCD检测机构6。
所述极片成型装置还包括设置于放卷机构1和收卷机构4之间的张力调节机构7，张力调节机构7包括辊轮71以及设置于辊轮71的张力传感器72。放卷机构1和收卷机构4可与磁粉制动器相连，张力传感器72与磁粉制动器形成闭环控制。当张力传感器72检测到辊轮71上极片P的张力出现偏差时，直接反馈控制磁粉制动器，磁粉制动器调整放卷轴或收卷轴的转速，从而调整极片P的张力。与传统的摆杆张力调节机构相比，本申请的张力调节 机构7结构简单，布局方便。张力调节机构7可为多个，分别设置在辊压机构2上游和收卷机构4上游。
参照图1和图8，所述极片成型装置还包括除皱毛刷8，设置于放卷机构1和模切机构3之间；除皱毛刷8与极片P相对且相对于极片P的横向X倾斜。具体地，极片P走带时，除皱毛刷8与极片P的空白区P2接触，参照图8，除皱毛刷8与空白区P2的接触区域相对于极片P的横向X倾斜。当极片P穿过除皱毛刷8时，除皱毛刷8滚刷空白区P2，从而达到除皱效果。
所述极片成型装置还包括设置于极片P走带路径上的导向辊、纠偏机构9、接带平台A和除尘毛刷B。导向辊为多个并引导极片P走带。纠偏机构9对极片P进行纠偏，保证极片P位于各个辊轮的中心。接带平台A设置于放卷机构1下游，当需要更换极片P时，新旧极片P可在接带平台A上连接。除尘毛刷B设置于分切机构5和收卷机构4之间，用于去除极片P表面的杂质。
本申请还提供一种极片成型方法，该方法能够提高极片的优率。参照图1至图8，所述极片成型方法具体包括以下步骤：
将具有空白区P2的极片P设置于放卷机构1；
牵引极片P穿过辊压机构2，辊压机构2在极片P的空白区P2压制出凸筋T；
牵引压制后的极片P穿过模切机构3，模切机构3裁切压制后的极片P的空白区P2，从而在压制后的极片P上形成极耳P3；
收卷机构4收卷形成极耳P3后的极片P。
本申请提供的极片成型方法能够在极片的空白区形成凸筋，从而提高空白区的强度，避免空白区弯折、打皱，保证极耳的裁切质量，提高极片的优率。
所述“牵引极片P穿过辊压机构2，辊压机构2在极片P的空白区P2压制出凸筋T”包括：牵引极片P穿过两组辊压机构2，所述两组辊压机构2在极片P的空白区P2压制出分别朝相反的方向突出的凸筋T。
如果采用单个辊压机构2，那么为了保证空白区P2的强度，凸筋T需要具有较大的深度，而这容易损伤空白区P2；同时，如果凸筋T深度较大，还会导致激光焦距的波动较大，影响激光模切。而采用两组辊压机构2，可以 减小凸筋T的深度要求，使压制出凸筋T更为均匀，同时便于实现激光模切。

Claims (12)

  1. 一种极片成型装置，其特征在于，包括放卷机构(1)、辊压机构(2)、模切机构(3)以及收卷机构(4)；
    放卷机构(1)、辊压机构(2)、模切机构(3)和收卷机构(4)沿极片(P)的走带方向依次设置，放卷机构(1)用于设置极片(P)，模切机构(3)用于裁切极片(P)，收卷机构(4)用于收卷极片(P)；
    辊压机构(2)包括相对设置的第一压辊(21)和第二压辊(22)，第二压辊(22)的表面设有突起(221)，且极片(P)从第一压辊(21)和第二压辊(22)之间穿过。
  2. 根据权利要求1所述的极片成型装置，其特征在于，第二压辊(22)为两个且沿第一压辊(21)的轴向布置。
  3. 根据权利要求1所述的极片成型装置，其特征在于，第二压辊(22)为直齿轮。
  4. 根据权利要求1所述的极片成型装置，其特征在于，辊压机构(2)为两组且沿极片(P)的走带方向设置，且极片(P)的两个表面分别朝向两组辊压机构(2)的第二压辊(22)。
  5. 根据权利要求1所述的极片成型装置，其特征在于，模切机构(3)为激光模切机构。
  6. 根据权利要求5所述的极片成型装置，其特征在于，
    模切机构(3)为一组且与极片(P)沿横向(X)的两端相对；或
    模切机构(3)为两组且沿极片(P)的走带方向依次设置，两组模切机构(3)分别与极片(P)沿横向(X)的两端相对。
  7. 根据权利要求1所述的极片成型装置，其特征在于，
    收卷机构(4)为两组，所述极片成型装置还包括分切机构(5)，设置于模切机构(3)和收卷机构(4)之间且用于将极片(P)分割为两条；
    分切机构(5)包括安装架(51)以及设置于安装架(51)的第一切割辊(52)和第二切割辊(53)，极片(P)能够从第一切割辊(52)和第二切割辊(53)之间穿过。
  8. 根据权利要求7所述的极片成型装置，其特征在于，所述极片成型装置还包括CCD检测机构(6)，用于检测经过模切机构(3)裁切的极片(P)以及经过分切机构(5)裁切的极片(P)。
  9. 根据权利要求1所述的极片成型装置，其特征在于，所述极片成型装置还包括设置于放卷机构(1)和收卷机构(4)之间的张力调节机构(7)，张力调节机构(7)包括辊轮(71)以及设置于辊轮(71)的张力传感器(72)。
  10. 根据权利要求1所述的极片成型装置，其特征在于，所述极片成型装置还包括除皱毛刷(8)，设置于放卷机构(1)和模切机构(3)之间；除皱毛刷(8)与极片(P)相对且相对于极片(P)的横向(X)倾斜。
  11. 一种极片成型方法，其特征在于，包括：
    将具有空白区(P2)的极片(P)设置于放卷机构(1)；
    牵引所述极片(P)穿过辊压机构(2)，所述辊压机构(2)在所述极片(P)的所述空白区(P2)压制出凸筋(T)；
    牵引所述压制后的极片(P)穿过模切机构(3)，所述模切机构(3)裁切所述压制后的极片(P)的所述空白区(P2)，从而在所述压制后的极片(P)上形成极耳(P3)；
    收卷机构(4)收卷形成所述极耳(P3)后的极片(P)。
  12. 根据权利要求11所述的极片成型方法，其特征在于，所述“牵引所述极片(P)穿过辊压机构(2)，所述辊压机构(2)在所述极片(P)的所述空白区(P2)压制出凸筋(T)”包括：
    牵引所述极片(P)穿过两组所述辊压机构(2)，所述两组辊压机构(2)在所述极片(P)的空白区(P2)压制出分别朝相反的方向突出的凸筋(T)。
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