WO2016037390A1 - 极片涂层的移除方法 - Google Patents

极片涂层的移除方法 Download PDF

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Publication number
WO2016037390A1
WO2016037390A1 PCT/CN2014/087647 CN2014087647W WO2016037390A1 WO 2016037390 A1 WO2016037390 A1 WO 2016037390A1 CN 2014087647 W CN2014087647 W CN 2014087647W WO 2016037390 A1 WO2016037390 A1 WO 2016037390A1
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WO
WIPO (PCT)
Prior art keywords
coating
pole piece
current collector
electrode plate
region
Prior art date
Application number
PCT/CN2014/087647
Other languages
English (en)
French (fr)
Inventor
张玢
赵义
何平
方宏新
程文强
Original Assignee
东莞新能源科技有限公司
宁德新能源科技有限公司
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Publication date
Application filed by 东莞新能源科技有限公司, 宁德新能源科技有限公司 filed Critical 东莞新能源科技有限公司
Priority to KR1020177004935A priority Critical patent/KR20170036007A/ko
Priority to EP14901573.7A priority patent/EP3193391A4/en
Priority to JP2017508669A priority patent/JP2017532721A/ja
Publication of WO2016037390A1 publication Critical patent/WO2016037390A1/zh
Priority to US15/444,189 priority patent/US20170170455A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/361—Removing material for deburring or mechanical trimming
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • 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 energy storage devices, and more particularly to a method for removing a pole piece coating.
  • Lithium-ion batteries have received wide attention due to their high energy density and environmental friendliness. They have been widely used in electronic devices such as mobile phones and notebook computers, and with the development of electric vehicle technology, lithium-ion batteries are in the field of electric vehicles. The application is also getting more and more attention.
  • the manufacturing speed of high-energy-density lithium-ion batteries is difficult to improve. This is because, in the process of manufacturing lithium-ion batteries, an important process that affects the manufacturing speed of lithium-ion batteries is to solder the tabs on the pole pieces of lithium-ion batteries, as shown in Figures 1 and 2, due to the coating, On the sheet 1 is a continuous coating 12, or the welding of the tabs needs to be welded in the middle of the pole piece. In order to achieve the welding of the tabs on the pole piece 1, the electrode area to be soldered on the pole piece 1 is first removed ( Or referred to as the coating 12 on the region R to be removed.
  • the principle of laser removal is that under the action of the laser, the coating absorbs a certain amount of energy, and the coating particles are vaporized, sublimated, and vibrated, thereby being removed. Since the energy distribution of the laser beam emitted by the laser is generally Gaussian, the distributed laser beam has high intermediate energy and low edge energy. The removal of the coating 12 on the pole piece 1 requires a certain range of energy, so in the laser beam in which the energy is Gaussian, the middle portion of the higher energy is likely to damage the foil (because of the set of the pole piece 1 of the battery)
  • the fluid 11 is generally a copper foil and an aluminum foil having a thickness of a few micrometers to a dozen micrometers.
  • the stress of the coating 12 is changed due to heat, which causes the pole piece 1 to be deformed, and the residual stress is removed after the coating 12 is removed.
  • the release pole piece 1 also produces a slight amount of deformation, which in turn affects the welding of subsequent tabs.
  • an inert gas is blown toward the removed region of the pole piece 1 by ejecting a gas stream to effect cleaning and cooling of the pole piece 1.
  • this method does not completely remove the particles on the removed area, leaving the particles to remain around the removed area, affecting the performance of the battery.
  • the present application provides a method for removing a pole piece coating, the pole piece comprising a current collector and a coating coated on at least one surface of the current collector, comprising the steps of: (1) placing the pole piece The area to be removed is fixed by vacuum adsorption from the opposite surface of the current collector surface where the area to be removed is located; (2) the laser beam is irradiated onto the pole piece from the side of the current collector surface where the area to be removed is located Coating the area to be removed to defeat the coating of the area to be removed on the pole piece, thereby exposing the current collector at the area to be removed on the pole piece; and (3) removing the generated portion in step (2) Coating residue.
  • the area to be removed on the pole piece is fixed by vacuum adsorption, and then the coating of the area to be removed is removed by a laser beam. Since the pole piece is fixed, the laser removal process can be avoided. The deformation of the pole piece caused by the heat generated by the laser due to the action of the laser and the residual stress released after the coating is removed.
  • FIG. 1 is a top plan view of an embodiment of a pole piece in a method of removing a pole piece coating according to the present application
  • Figure 2 is a front elevational view of Figure 1;
  • FIG. 3 is a top plan view of an embodiment of a pole piece in a method of removing a pole piece coating according to the present application;
  • Figure 4 is a front elevational view of Figure 3;
  • FIG. 5 is a top plan view of an embodiment of a pole piece in a method of removing a pole piece coating according to the present application
  • Figure 6 is a front elevational view of Figure 5;
  • FIG. 7 is a top plan view of an embodiment of a pole piece in a method of removing a pole piece coating according to the present application.
  • Figure 8 is a front elevational view of Figure 7.
  • the pole piece 1 in the method of removing a pole piece coating according to the present application, includes a current collector 11 and a coating 12 coated on at least one surface of the current collector 11, including the steps of: a) the opposite surface of the surface of the current collector 11 where the region to be removed R on the pole piece 1 is fixed by vacuum adsorption; (2) from the region R to be removed The laser beam on the surface of the current collector 11 illuminates the coating 12 of the region to be removed R on the pole piece 1 to break the coating 12 of the region R to be removed on the pole piece 1, so that the pole piece 1 is The current collector 11 at the region R to be removed is exposed; and (3) the coating residue generated in the step (ii) is removed.
  • the region R to be removed on the pole piece 1 is fixed by vacuum adsorption, and then the coating 12 of the region R to be removed is removed by using a laser beam. Since the pole piece 1 is fixed, the deformation of the pole piece 1 caused by the stress of the coating 12 due to the action of the laser and the residual stress released after the coating 12 is removed can be avoided during the laser removal.
  • the degree of vacuum of vacuum adsorption may be -20 KPa to -100 KPa.
  • one surface of the current collector 11 may be coated with a coating 12.
  • the coating 12 of the region to be removed R on the pole piece 1 is shown in one place, but in practice, the position of the coating 12 of the region R to be removed on the pole piece is shown.
  • the shape, the number, and the number are not limited thereto, and may be changed as needed.
  • the steps (1) to (3) may be carried out stepwise or simultaneously.
  • both surfaces of the current collector 11 may be coated with the coating 12.
  • both surfaces of the current collector 11 are coated with a coating 12 which is mirror symmetrical about the current collector 11.
  • the two surfaces of the current collector 11 are coated with the coating 12 not mirror symmetrical about the current collector 11.
  • the two surfaces of the current collector 11 are coated with the coating 12 not mirror-symmetrically centered on the current collector 11.
  • the two surfaces of the current collector 11 are coated with a coating 12 portion which is mirror symmetrical about the current collector 11.
  • the position, shape, and number of the coating layers 12 of the region R to be removed, respectively, on both surfaces of the current collector 11 of the pole piece are not limited thereto, and may be changed as needed. Meanwhile, for the coating 12 of the region R to be removed of different positions, shapes and numbers, the steps (1) to (3) may be carried out stepwise or simultaneously.
  • the pole piece 1 is a positive electrode piece or a negative electrode piece.
  • the pole piece 1 may be a pole piece of a lithium ion battery.
  • the thickness of the coating layer 12 coated on one surface of the current collector 11 is from 30 ⁇ m to 200 ⁇ m.
  • the laser beam may be a flat top beam.
  • the energy distribution of the laser beam of the flat-top light source is flat and uniform, and the occurrence of the unremoved region R of the to-be-removed region on the pole piece 1 caused by the uneven energy of the laser beam can be avoided, and the laser beam can be avoided.
  • the energy distribution is uneven, resulting in deformation of the pole piece 1 due to uneven heating. All of the energy of the flat-top beam is utilized in an optimal manner. The closer the flatness is to 1, the better.
  • the power of the laser may be from 20 W to 500 W. If the power of the laser is too low, the coating 12 of the region R to be removed on the pole piece 1 cannot be effectively removed, and if the power is too low, multiple removals are required to remove the coating 12, and the pole piece 1 is added. Thermal denaturation, if the power of the laser is too high, too much heat will cause the pole piece 1 to generate an excessive heat affected zone, and may also damage the current collector 11.
  • the laser beam can strike the coating 12 of the region R to be removed on the pole piece 1 by galvanometer scanning.
  • the galvanometer scan ensures that the laser head does not move, thereby improving the quality of the laser beam to be removed, removing the stability, removing the size accurately, and easily achieving mass production.
  • the step (3) may be at least one of a vacuum suction and a gas flow. Thereby, the particles on the coating removal area can be completely removed.
  • the negative pressure of the vacuum suction may be -5 Kpa to -50 KPa.
  • the step (3) further comprises the step of removing the coating residue by a dusty method to assist in further cleaning.
  • the current collector 11 exposed from the removal region of the coating 12 can be used to weld the tabs.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Secondary Cells (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laser Beam Processing (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请提供了一种极片涂层的移除方法，极片包括集流体和涂覆在集流体的至少一个表面上的涂层，包括步骤：（一）将极片上的待移除区域从该待移除区域所处的集流体表面的相反的表面采用真空吸附方式固定；（二）从该待移除区域所处的集流体表面一侧激光束照射极片上的该待移除区域的涂层，以击溃极片上的该待移除区域的涂层，从而使极片上该待移除区域处的集流体露出；以及（三）清除在步骤（二）中产生的涂层残留物。首先将极片上的待移除区域采用真空吸附方式固定，然后采用激光束移除该待移除区域的涂层，由于极片被固定，所以可避免在激光移除的过程中涂层由于激光作用受热产生的应力以及涂层被移除后释放的残余应力导致的极片的变形。

Description

极片涂层的移除方法 技术领域
本申请涉及储能器件领域，尤其涉及一种极片涂层的移除方法。
背景技术
锂离子电池因其具有能量密度高、环境友好等优点而受到广泛的关注，在手机、笔记本电脑等电子设备中得到了广泛应用，并且随着电动汽车技术的发展，锂离子电池在电动汽车领域的应用也越来越受到关注。
尽管市场对锂离子电池的需求越来越大，高能量密度的锂离子电池的制造速度却很难得到提高。这是因为：在制造锂离子电池的工序中，影响锂离子电池制造速度的一个重要工序就是在锂离子电池的极片上焊接极耳，如图1和图2所示，由于涂布时，极片1上是连续的涂层12，或者极耳的焊接需要在极片的中间部位焊接，为了实现极耳在极片1上的焊接，首先要移除极片1上待焊接极耳区域(或者称之为待移除区域R)上的涂层12。而且，在一些特殊的电池生产工艺中，还需要在电池的极片1的不同位置移除不同形状的涂层12。例如，如图3和4所示，有时还需要在极片1的两个表面上的对应位置移除待移除区域R上的涂层12。
目前常用的移除方法包括机械刮除移除法和化学移除法，但两种移除方法存在着很多问题：机械移除难以保证移除的洁净度，特别是在薄极片中还容易刮伤极片；化学移除则对环境造成了一定的伤害，存在着工作环境差和生产效率低等缺点。针对以上两种方法存在的不足，于2012年11月13日授权公告的美国专利号为US8309880B2的专利文献公开了一种采用激光移除极片上的涂层的方法，解决了上述两种移除方法存在的问题。
但是，该专利中的方法存在以下不足：
第一，激光移除的原理是：在激光的作用下，涂层吸收一定的能量，涂层颗粒发生气化、升华和振动等，从而被移除。由于激光器发出的激光束的能量分布一般都是高斯分布，这种分布的激光束中间能量高、边缘能量较低。 而移除极片1上的涂层12需要一定范围内的能量，所以这种能量呈高斯分布的激光束中，能量较高的中间部分容易伤害到箔材(因为电池的极片1的集流体11一般为铜箔和铝箔，厚度为几微米到十几微米，这部分高能量很容易将铜箔或铝箔穿透)，影响移除质量和极耳的焊接质量；而边缘的能量又低于移除需要的能量，这样就造成涂层的残留，也同样影响了移除的质量。同时这些高能量和低能量由于不能被有效的利用而使得能量的利用率很低。
第二，采用激光移除极片1的涂层12的过程中，在激光的作用下涂层12因受热，应力会发生变化，进而导致极片1变形，涂层12被去除后由于残余应力的释放极片1也会产生微量变形，进而影响后续极耳的焊接。
第三，该专利中通过喷出气流的方式将惰性气体吹向极片1的移除后的区域，以实现对极片1的清洁和冷却。但是，这种方法不能完全的清除移除后的区域上的颗粒，从而会使颗粒残留在移除后的区域的周围，影响电池的性能。
第四，在移除过程中激光在拐角处要不停的加速、减速，从而导致激光头移动进行移除的品质不稳定、移除的尺寸不精准，所以这种方法很难实现量产化。
发明内容
鉴于背景技术中存在的问题，本申请的目的在于提供一种极片涂层的移除方法，其能避免极片变形。
为了实现上述目的，本申请提供了一种极片涂层的移除方法，极片包括集流体和涂覆在集流体的至少一个表面上的涂层，包括步骤：(一)将极片上的待移除区域从该待移除区域所处的集流体表面的相反的表面采用真空吸附方式固定；(二)从该待移除区域所处的集流体表面一侧激光束照射极片上的该待移除区域的涂层，以击溃极片上的该待移除区域的涂层，从而使极片上该待移除区域处的集流体露出；以及(三)清除在步骤(二)中产生的涂层残留物。
本申请的有益效果如下：
首先将极片上的待移除区域采用真空吸附方式固定，然后采用激光束移除该待移除区域的涂层，由于极片被固定，所以可避免在激光移除的过程中 涂层由于激光作用受热产生的应力以及涂层被移除后释放的残余应力导致的极片的变形。
附图说明
图1为根据本申请的极片涂层的移除方法中的极片的一实施例的俯视图；
图2为图1的正视图；
图3为根据本申请的极片涂层的移除方法中的极片的一实施例的俯视图；
图4为图3的正视图；
图5为根据本申请的极片涂层的移除方法中的极片的一实施例的俯视图；
图6为图5的正视图；
图7为根据本申请的极片涂层的移除方法中的极片的一实施例的俯视图；
图8为图7的正视图。
其中，附图标记说明如下：
1极片                 12涂层
11集流体              R待移除区域
具体实施方式
下面参照附图来详细说明根据本申请的极片涂层的移除方法。
参照图1至图8，在根据本申请的极片涂层的移除方法中，极片1包括集流体11和涂覆在集流体11的至少一个表面上的涂层12，包括步骤：(一)将极片1上的待移除区域R从该待移除区域R所处的集流体11表面的相反的表面采用真空吸附方式固定；(二)从该待移除区域R所处的集流体11表面一侧激光束照射极片1上的该待移除区域R的涂层12，以击溃极片1上的该待移除区域R的涂层12，从而使极片1上该待移除区域R处的集流体11露出；以及(三)清除在步骤(二)中产生的涂层残留物。
在根据本申请的极片涂层的移除方法中，首先将极片1上的待移除区域R采用真空吸附方式固定，然后采用激光束移除该待移除区域R的涂层12，由于极片1被固定，所以可避免在激光移除的过程中涂层12由于激光作用受热产生的应力以及涂层12被移除后释放的残余应力导致的极片1的变形。
在根据本申请的极片涂层的移除方法中，真空吸附的真空度可为-20KPa～-100KPa。
在根据本申请的极片涂层的移除方法中，参照图1和图2，集流体11的一个表面可涂覆有涂层12。在图1和图2示出的例子中，极片1上的待移除区域R的涂层12示出为一处，但实际中，待移除区域R的涂层12在极片上的位置、形状、及数量不限于此，均可以根据需要改变。同时，对于不同位置、形状及数量的待移除区域R的涂层12，可以分步或同时进行步骤(一)～(三)。
在根据本申请的极片涂层的移除方法中，参照图3和图4、图5和图6、图7和图8，集流体11的两个表面可涂覆有涂层12。
在图3和图4示出的例子中，集流体11的两个表面涂覆有涂层12以集流体11为中心呈镜像对称。在图5和图6示出的例子中，集流体11的两个表面涂覆有涂层12不以集流体11为中心呈镜像对称。在图7和图8示出的例子中，集流体11的两个表面涂覆有涂层12不以集流体11为中心呈镜像对称。在图7和图8示出的例子中，集流体11的两个表面涂覆有涂层12部分以集流体11为中心呈镜像对称。在实际中，待移除区域R的涂层12分别在极片的集流体11的两个表面上的位置、形状、及数量均不限于此，均可以根据需要改变。同时，对于不同位置、形状及数量的待移除区域R的涂层12，可以分步或同时进行步骤(一)～(三)。
在根据本申请的极片涂层的移除方法中，极片1为正极极片或负极极片。
在根据本申请的极片涂层的移除方法中，在一实施例中，极片1可为锂离子电池的极片。
在根据本申请的极片涂层的移除方法中，涂覆在集流体11的一个表面上的涂层12的厚度为30μm～200μm。
在根据本申请的极片涂层的移除方法中，在一实施例中，激光束可为平顶光束。
平顶光源激光束的能量分布呈平坦曲线状、分布均匀，可避免激光束能量不均匀导致的极片1上的待移除区域R移除不干净的情况的发生，同时可避免因激光束能量分布不均匀，导致的极片1因受热不均匀产生的变形。所述平顶光束的所有能量都以最佳方式被充分利用。平顶率(Flatness)越接近1越好。
在根据本申请的极片涂层的移除方法中，在一实施例中，激光的功率可为20W-500W。如果激光的功率过低，不能有效地将极片1上的待移除区域R的涂层12移除干净，而且功率过低的话需要多次移除才能去除涂层12，增加极片1的热变性，如果激光的功率过高，产生的热量过多会使极片1产生过大的热影响区域，同时也可能会伤害到集流体11。
在根据本申请的极片涂层的移除方法中，在一实施例中，激光束可通过振镜扫描的方式击溃极片1上待移除区域R的涂层12。振镜扫描可保证激光头不动，从而提高激光束进行移除的品质，移除稳定、移除尺寸精准，易实现量产化。
在根据本申请的极片涂层的移除方法中，在一实施例中，步骤(三)可采取的方式是负压吸除、气流吹扫中的至少一种。由此，能够完全地清除涂层移除区域上的颗粒。在一实施例中，负压吸除的负压可为-5Kpa～-50KPa。
在根据本申请的极片涂层的移除方法中，步骤(三)之后还包括步骤：通过粘尘方式清除涂层残留物，以起到辅助的进一步的清洁作用。
在根据本申请的极片涂层的移除方法中，涂层12移除区域露出的集流体11可用于焊接极耳。

Claims (10)

  1. 一种极片涂层的移除方法，极片(1)包括集流体(11)和涂覆在集流体(11)的至少一个表面上的涂层(12)，其特征在于，包括步骤：
    (一)将极片(1)上的待移除区域(R)从该待移除区域(R)所处的集流体(11)表面的相反的表面采用真空吸附方式固定；
    (二)从该待移除区域(R)所处的集流体(11)表面一侧激光束照射极片(1)上的该待移除区域(R)的涂层(12)，以击溃极片(1)上的该待移除区域(R)的涂层(12)，从而使极片(1)上该待移除区域(R)处的集流体(11)露出；以及
    (三)清除在步骤(二)中产生的涂层残留物。
  2. 根据权利要求1所述的极片涂层的移除方法，其特征在于，真空吸附的真空度为-20KPa～-100KPa。
  3. 根据权利要求1所述的极片涂层的移除方法，其特征在于，涂覆在集流体(11)的一个表面上的涂层(12)的厚度为30μm～200μm。
  4. 根据权利要求1所述的极片涂层的移除方法，其特征在于，激光束为平顶光束。
  5. 根据权利要求1所述的极片涂层的移除方法，其特征在于，激光的功率为20W-500W。
  6. 根据权利要求1所述的极片涂层的移除方法，其特征在于，激光束通过振镜扫描的方式击溃极片(1)上待移除区域(R)的涂层(12)。
  7. 根据权利要求1所述的极片涂层的移除方法，其特征在于，步骤(三)采取的方式是负压吸除、气流吹扫中的至少一种。
  8. 根据权利要求7所述的极片涂层的移除方法，其特征在于，负压吸除的负压为-5Kpa～-50KPa。
  9. 根据权利要求1所述的极片涂层的移除方法，其特征在于，步骤(三)之后还包括步骤：
    通过粘尘方式清除涂层残留物。
  10. 根据权利要求1所述的极片涂层的移除方法，其特征在于，涂层(12)移除区域露出的集流体(11)用于焊接极耳。
PCT/CN2014/087647 2014-09-12 2014-09-28 极片涂层的移除方法 WO2016037390A1 (zh)

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