WO2013000375A1 - 一种极片卷绕方法及极片卷绕装置 - Google Patents

一种极片卷绕方法及极片卷绕装置 Download PDF

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Publication number
WO2013000375A1
WO2013000375A1 PCT/CN2012/077293 CN2012077293W WO2013000375A1 WO 2013000375 A1 WO2013000375 A1 WO 2013000375A1 CN 2012077293 W CN2012077293 W CN 2012077293W WO 2013000375 A1 WO2013000375 A1 WO 2013000375A1
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Prior art keywords
mandrel
pole piece
diaphragm
winding
core rod
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PCT/CN2012/077293
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English (en)
French (fr)
Inventor
曾令中
阳如坤
余志光
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深圳市吉阳自动化科技有限公司
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Publication of WO2013000375A1 publication Critical patent/WO2013000375A1/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
    • H01M10/0409—Machines for assembling batteries for cells with wound 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of batteries, and in particular to a pole piece winding method and a pole piece winding device.
  • the method of artificially adhering the diaphragm and the mandrel reduces the speed of the winding of the battery core, resulting in low battery production efficiency; on the other hand, it may be affected by factors such as operation mode and objective environment, resulting in weak bonding or Problems such as positional shift will cause poor quality or low yield of the battery to a certain extent.
  • the main technical problem to be solved by the present application is to provide a pole piece winding method and a pole piece winding device which improve production efficiency and improve process quality.
  • the present application provides a pole piece winding method, including the following steps:
  • Step A placing the diaphragm close to the mandrel and in a relative position with the mandrel;
  • Step B bonding the separator to the surface of the mandrel by means of heat welding
  • Step C The positive and negative electrode sheets are placed close to the core rod and separated by the separator, and the positive and negative electrode sheets are brought into a front-back state to start winding.
  • the present application also provides a pole piece winding device including a winder for winding a positive and negative electrode sheets on a mandrel, and a heating fusing member for when the diaphragm is in close proximity and mounted on the winding After the mandrel on the machine is in a relative position, the diaphragm is bonded to the surface of the mandrel by means of heat welding.
  • the present invention improves the pole piece winding process in the production process of the existing lithium ion battery, not only improves the process speed of the battery core winding, but also improves the battery production efficiency, and the double-sided glue
  • the method of bonding the membrane to the mandrel by means of heat fusion is directly integrated by melting one or two materials, and the membrane is firmly and accurately bonded to the mandrel. Effectively guarantees the quality of the battery and improves its pass rate.
  • FIG. 1 is a flow chart of a pole piece winding method according to an embodiment of the present application.
  • FIG. 2 is a schematic view of a pole piece winding device according to an embodiment of the present application.
  • FIG. 3 is a schematic view showing a trace of a weld on a core rod according to an embodiment of the present application
  • FIG. 4 is a schematic view showing a trace of a weld on a core rod according to another embodiment of the present application.
  • Figure 5 is a cross-sectional view showing the structure of a mandrel of the first embodiment of the present application
  • Figure 6 is a right side view of the mandrel structure of the first embodiment of the present application.
  • Figure 7 is a cross-sectional view showing the structure of a mandrel of a second embodiment of the present application.
  • Figure 8 is a right side view of the mandrel structure of the second embodiment of the present application.
  • Figure 9 is a cross-sectional view showing the structure of a mandrel of a third embodiment of the present application.
  • Figure 10 is a right side elevational view of the mandrel structure of the third embodiment of the present application.
  • the invention improves the pole piece winding process in the production process of a large cylindrical lithium ion battery and the like, and replaces the positive and negative electrode sheets by means of heat welding instead of the manual double-sided glue in the prior art.
  • the diaphragm is bonded to the surface of the mandrel to improve the pole piece winding efficiency and process quality.
  • a pole piece winding method of the embodiment shown in FIG. 1 includes the following steps:
  • Step S100 When it is necessary to form a battery core by pole piece winding, as shown in FIG. 2, the winder drives the diaphragm 20 to move under the control of a controller such as a PLC, and preferably the diaphragm 20 is kept constant by the transition nip roller 30. The tension moves smoothly, eventually bringing it close to and opposite the position of the mandrel 10.
  • a controller such as a PLC
  • Step S101 The controller controls the heating driving mechanism such as the cylinder to automatically feed the hot stamping knife 40 according to the direction of the arrow in FIG. 2, and the hot stamping knife 40 can be installed on a welding frame independent of the winding machine, and one end is set.
  • the heating tube and the other end are the blanching end, and the hot stamping knife 40 of this step is automatically fed until the blanching end approaches or contacts the diaphragm 20.
  • Step S102 Using the welded end of the hot stamping knives 40, the membrane 20 is bonded to the surface of the mandrel 10 to form a firm connection.
  • the blanching end of the hot stamping knife 40 can be provided with different shapes of contacts as needed, so that the separator 20 of the present step is bonded to the welded portion of the surface of the mandrel 10 to form different shapes of the traces 50, for example, the contacts can be continuous strips.
  • the contacts are either non-continuous plurality of point contacts having the same length as the diaphragm 20, and finally strip and dot weld lines 50 are formed in the embodiment of Figures 3 and 4, respectively.
  • the temperature of the heat fusion that is, the heating temperature of the heating pipe should at least be able to surface the separator 20 and/or the mandrel 10.
  • the material is melted, for example, the heating temperature is 150 to 200 ° C, and the embodiment is 165 ° C. Since different core rods 10 may have different materials, the heat generation temperature may be different.
  • the core rod 10 is entirely made of plastic material, which has good resistance to electrolyte corrosion and can be combined with the separator.
  • the heating temperature may be greater than or equal to the melting point of the diaphragm 20 or the plastic mandrel; in the embodiment shown in Figures 9 and 10, the mandrel is a metal mandrel having a surface covering the plastic film 12, The plastic film 12 is resistant to electrolyte corrosion and can be well adhered to the separator, so the heating temperature can be greater than or equal to the melting point of the membrane or plastic film 12.
  • Step S103 The controller again controls the heating drive mechanism such as the cylinder to automatically retract the hot stamping knife 40 to the original position.
  • Step S104 The winder presses the positive and negative electrode sheets close to the core rod 10 and is separated by the separator 20, and the positive and negative electrode sheets are placed in a front-rear direction, and then ready to be wound.
  • Step S105 The rotating shaft of the winder rotates to drive the positive and negative electrode sheets to start winding on the core rod 10 to form a battery core.
  • the mandrel 10 may have different shapes depending on the shape of the battery, for example, the core rod 10 of the large cylindrical lithium ion battery, which has a cylindrical shape as shown in FIGS. 5 and 6, and may of course be as needed. Other shapes are made to apply the present application to battery manufacturing processes of other shapes.
  • a positioning structure may be disposed on the mandrel 10, and the mandrel 20 may be positioned by the positioning portion in step S100.
  • the positioning portion shown in FIG. 7 to FIG. 10 may be a positioning groove 11 disposed at two ends of the core rod 10.
  • the positioning portion may also be a polygonal inner wall disposed on the core rod 10 (instead of the cylindrical inner wall in the prior art).
  • the present application also provides a pole piece winding device for achieving pole piece winding by the above method, As shown in FIG. 2, the device mainly comprises a heating fusing member and a winder for winding the positive and negative electrode sheets on the mandrel 10, and the heating fusing member may be a hot stamping knife 40 for when the diaphragm 20 is close to After aligning the mandrel 10 mounted on the winder, the separator 20 is bonded to the surface of the mandrel 10 by heat welding.
  • the heating fusing member may be a hot stamping knife 40 for when the diaphragm 20 is close to After aligning the mandrel 10 mounted on the winder, the separator 20 is bonded to the surface of the mandrel 10 by heat welding.
  • the heating fusion splicing of the embodiment adopts the automatic feeding method to realize the heating welding, and of course, the manual feeding can be adopted.
  • the heating fusion splicing piece can adopt the same controller and control program as the winding machine. It is realized by controller, welding frame and heating drive mechanism.
  • the heating driving mechanism may adopt a linear driving mechanism such as a cylinder, and the controller is connected to the cylinder for driving according to the winding control program; the hot stamping knife 40 is mounted on the welding frame and connected to the power output end of the cylinder or the like. .
  • the cylinder drives the hot stamping knife 40 under the control of the controller to automatically feed until the blanching end approaches or contacts the diaphragm 20, and the hot stamping knife 40 bonds the diaphragm 20 to the core.
  • the cylinder drives the hot stamping knife 40 to automatically retract under the control of the controller, and then the positive and negative electrode sheets can be placed to start the pole piece winding. After the winding is completed, the next core rod 10 is replaced by the heat again.
  • the hot knife 40 automatically feeds and the like, and sequentially completes the production of a plurality of batteries.
  • the present invention improves the existing pole piece winding process, not only improves the process speed of the battery core winding, but also improves the battery production efficiency, and utilizes the heat fusion welding as compared with the way in which the double-sided glue bonds the diaphragm and the core rod.
  • the method is that the diaphragm and the mandrel are directly integrated by melting one or two materials, and the diaphragm is firmly and accurately bonded to the mandrel, thereby effectively ensuring the quality of the battery core and improving the pass rate.

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  • Secondary Cells (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Replacement Of Web Rolls (AREA)

Abstract

一种极片卷绕方法及极片卷绕装置，极片卷绕方法包括以下步骤：步骤A：将隔膜贴近芯棒并与芯棒成相对位置；步骤B：利用加热熔接的方式将所述隔膜粘结在所述芯棒表面；步骤C：将正、负极片贴近所述芯棒并利用所述隔膜隔开，使所述正、负极片成前后相对状态后，开始卷绕。本申请对现有的极片卷绕工艺进行改进，不仅提高了电芯卷绕的工艺速度，提高了电池生产效率，而且与双面胶粘结隔膜与芯棒的方式相比，利用加热熔接的方式使隔膜与芯棒之间通过一种或两种材料熔融而直接连为一体，将隔膜牢固、准确地粘结在芯棒上，有效保证了电芯的品质，提高了其合格率。

Description

一种极片卷绕方法及极片卷绕装置 技术领域
本申请涉及电池领域，尤其涉及一种极片卷绕方法及极片卷绕装置。
 背景技术
现有的大圆柱锂离子蓄电池等电池的生产过程中，通过极片卷绕工艺形成电芯时，首先需要人工利用双面胶将隔膜与电池芯棒粘连在一起，接着放入正负极片开始进行极片卷绕，且每个电芯的卷绕都采用这种处理方式逐一处理。
然而，这种人工粘连隔膜与芯棒的方式一方面降低了电芯卷绕的工艺速度，导致电池生产效率低下；另一方面可能受到操作方式、客观环境等因素的影响造成粘结不牢固或位置偏移等问题，会在一定程度上导致电芯的品质不良或合格率低下。
 技术问题
本申请要解决的主要技术问题是，提供一种提高生产效率、改善工艺质量的极片卷绕方法及极片卷绕装置。
 技术解决方案
为解决上述技术问题，本申请提供一种极片卷绕方法,包括以下步骤：
步骤A：将隔膜贴近芯棒并与芯棒成相对位置；
步骤B：利用加热熔接的方式将所述隔膜粘结在所述芯棒表面；
步骤C：将正、负极片贴近所述芯棒并利用所述隔膜隔，使所述正、负极片成前后相对状态，开始卷绕。
本申请还提供一种极片卷绕装置,包括用于将正、负极片卷绕在芯棒上的卷绕机，还包括加热熔接件，用于当隔膜贴近并与安装在所述卷绕机上的芯棒成相对位置后，利用加热熔接的方式将所述隔膜粘结在所述芯棒表面。
 有益效果
本申请的有益效果是：本申请对现有的锂离子电池生产过程中的极片卷绕工艺进行改进，不仅提高了电芯卷绕的工艺速度，提高了电池生产效率，而且与双面胶粘结隔膜与芯棒的方式相比，利用加热熔接的方式使隔膜与芯棒之间通过一种或两种材料熔融而直接连为一体，将隔膜牢固、准确地粘结在芯棒上，有效保证了电芯的品质，提高了其合格率。
附图说明
图1为本申请一种实施例的极片卷绕方法流程图；
图2为本申请一种实施例的极片卷绕装置示意图；
图3为本申请一种实施例芯棒上熔接处的痕纹示意图；
图4为本申请另一种实施例芯棒上熔接处的痕纹示意图；
图5为本申请第一种实施例的芯棒结构剖面图；
图6为本申请第一种实施例的芯棒结构右视图；
图7为本申请第二种实施例的芯棒结构剖面图；
图8为本申请第二种实施例的芯棒结构右视图；
图9为本申请第三种实施例的芯棒结构剖面图；
图10为本申请第三种实施例的芯棒结构右视图。
 本发明的最佳实施方式
本发明的实施方式
下面通过具体实施方式结合附图对本申请作进一步详细说明。
本申请对大圆柱锂离子蓄电池等电池生产过程中的极片卷绕工艺进行改进，利用加热熔接的方式替代现有技术中手工粘贴双面胶的方式，将用于隔开正、负极片的隔膜粘结在芯棒表面，从而提高极片卷绕效率和工艺质量。
具体地，如图1所示实施例的一种极片卷绕方法,包括以下步骤：
步骤S100：需要通过极片卷绕成型一个电芯时，如图2所示，卷绕机在PLC等控制器的控制下驱动隔膜20运动，优选还可借助过渡夹辊30使隔膜20保持一定的张力平稳移动，最终使其贴近并与芯棒10的位置相对。
步骤S101：控制器控制气缸等加热驱动机构，使热烫刀40按照图2的箭头方向自动进给一定距离，该热烫刀40可安装在与卷绕机独立的一个熔接架上，一端设置加热管，另一端为热烫端，本步骤的热烫刀40自动进给直到热烫端靠近或者接触隔膜20。
步骤S102: 利用热烫刀40的熔接端，将隔膜20粘结在芯棒10表面从而形成牢固的连接。热烫刀40的热烫端可根据需要设置不同形状的触点，使本步骤隔膜20粘结在芯棒10表面的熔接处形成不同形状的痕纹50，例如触点可为连续的条形触点或者为非连续的多个点状触点，长度与隔膜20的宽度相同，最终在图3和图4的实施方式中分别形成条状和点状的熔接痕纹50。
为了使本步骤中隔膜20与芯棒10之间形成稳定、可靠的粘结而保证电芯的品质，加热熔接的温度即发热管的发热温度应至少能够将隔膜20和/或芯棒10表面的材料熔融，例如加热温度可取150～200℃，本实施方式选165℃。由于不同芯棒10可能具有不同材质，因此发热温度可能不同，例如图5至图8所示的实施方式中，芯棒10整体为塑料材质，其具有良好的耐电解液腐蚀性能并能与隔膜20很好地相熔粘连，因此加热温度可大于或等于隔膜20或塑料芯棒的熔点；如图9和图10所示的实施方式中，芯棒为表面覆盖塑料薄膜12的金属芯棒，该塑料薄膜12能够耐电解液腐蚀并能与隔膜很好地相熔粘，因此加热温度可大于或等于隔膜或塑料薄膜12的熔点。
步骤S103: 控制器再次控制气缸等加热驱动机构，使热烫刀40自动回退至原始位置。
步骤S104:卷绕机将正、负极片贴近芯棒10并利用隔膜20隔开，使正、负极片成前后相对状态后，准备进行卷绕。
步骤S105:卷绕机的旋转轴旋转而带动正、负极片开始在芯棒10上卷绕形成电芯。
本实施方式中，根据电池形状的不同，芯棒10可能具有不同的形状，例如为大圆柱锂离子蓄电池的芯棒10，呈图5和图6所示的圆筒状，当然也可根据需要制成其他形状，使本申请应用于其他形状的蓄电池制造工艺。
优选地，为了便于加热熔接的顺利进行，芯棒10上还可设置定位结构，步骤S100中可利用定位部对芯棒20进行定位。例如图7至图10所示定位部可为设置在芯棒10两端的定位槽11，当然定位部还可为设置在芯棒10上的多边形内壁（替代现有技术中的圆筒状内壁），当芯棒10安装在卷绕机的旋转轴上时，其定位部与旋转轴上相应的结构形成紧配合，避免其绕旋转轴自由转动而导致加热熔接的位置偏移。
本申请还提供了利用以上方法实现极片卷绕的一种极片卷绕装置, 如图2所示，该装置主要包括加热熔接件和用于将正、负极片卷绕在芯棒10上的卷绕机，加热熔接件可为热烫刀40，用于当隔膜20贴近并对齐安装在卷绕机上的芯棒10后，利用加热熔接的方式将隔膜20粘结在芯棒10表面。
优选地，本实施方式的加热熔接件采用自动进给的方式实现加热熔接，当然可采用手工进给，例如自动进给的方式中，加热熔接件可与卷绕机采用同一控制器和控制程序，通过控制器、熔接架和加热驱动机构实现。例如，加热驱动机构可采用气缸等直线驱动机构，控制器与气缸相连，用于按照卷绕控制程序对其进行驱动；热烫刀40安装在熔接架上，且与气缸等的动力输出端相连。当控制器控制隔膜20贴近并对齐芯棒10后，气缸在控制器的控制下驱动热烫刀40自动进给直到热烫端靠近或者接触隔膜20，热烫刀40将隔膜20粘结在芯棒10表面后，气缸在控制器的控制下驱动热烫刀40自动回退，接着即可放入正、负极片而开始极片卷绕，卷绕完成后换上下一芯棒10再次重复热烫刀40自动进给等动作，依次完成多个电芯的制作。
本申请对现有的极片卷绕工艺进行改进，不仅提高了电芯卷绕的工艺速度，提高了电池生产效率，而且与双面胶粘结隔膜与芯棒的方式相比，利用加热熔接的方式使隔膜与芯棒之间通过一种或两种材料熔融而直接连为一体，将隔膜牢固、准确地粘结在芯棒上，有效保证了电芯的品质，提高了其合格率。
应该理解，以上实施方式只是用于帮助理解本申请，而不应理解为对本申请的限制。对于本领域的技术人员，依据本申请的思想，可以对上述具体实施方式进行变化。
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Claims (10)

  1. 一种极片卷绕方法,其特征在于，包括以下步骤：
    步骤A：将隔膜贴近芯棒并与芯棒成相对位置；
    步骤B：利用加热熔接的方式将所述隔膜粘结在所述芯棒表面；
    步骤C：将正、负极片贴近所述芯棒并利用所述隔膜隔开，使所述正、负极片成前后相对状态后，开始卷绕。
  2. 如权利要求1所述的方法，其特征在于，所述步骤B具体包括以下子步骤：
    步骤B1:通过加热驱动机构使热烫刀自动进给，利用所述热烫刀的熔接端将所述隔膜粘结在所述芯棒表面；
    步骤B2:通过加热驱动机构使所述热烫刀自动回退。
  3. 如权利要求2所述的方法，其特征在于，所述热烫刀中设置加热管。
  4. 如权利要求1所述的方法，其特征在于，所述芯棒上还设置定位部，所述步骤A中，还包括利用所述定位部对所述芯棒进行定位的步骤。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，所述芯棒为塑料芯棒或表面覆盖塑料薄膜的金属芯棒。
  6. 如权利要求1至4中任一项所述的方法，其特征在于，所述步骤B中，所述隔膜粘结在所述芯棒表面的熔接处的痕纹呈点状或条状。
  7. 如权利要求5所述的方法，其特征在于，所述步骤B中，加热熔接的温度大于或等于所述隔膜、塑料芯棒或塑料薄膜的熔点。
  8. 一种极片卷绕装置,包括用于将正、负极片卷绕在芯棒上的卷绕机，其特征在于，还包括加热熔接件，用于当隔膜贴近并与安装在所述卷绕机上的芯棒成相对位置后，利用加热熔接的方式将所述隔膜粘结在所述芯棒表面。
  9. 如权利要求8所述的装置，其特征在于，所述加热熔接件为带有热烫端的热烫刀，所述热烫刀中设置发热管。
  10. 如权利要求9所述的装置，其特征在于，还包括控制器、熔接架和加热驱动机构，所述控制器与所述加热驱动机构连接，所述热烫刀安装在所述熔接架上且与所述加热驱动机构的动力输出端相连。
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