WO2016037355A1 - 极片涂层的移除装置 - Google Patents

极片涂层的移除装置 Download PDF

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Publication number
WO2016037355A1
WO2016037355A1 PCT/CN2014/086410 CN2014086410W WO2016037355A1 WO 2016037355 A1 WO2016037355 A1 WO 2016037355A1 CN 2014086410 W CN2014086410 W CN 2014086410W WO 2016037355 A1 WO2016037355 A1 WO 2016037355A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
coating
laser
disposed
removal
Prior art date
Application number
PCT/CN2014/086410
Other languages
English (en)
French (fr)
Inventor
张玢
赵义
陈木贵
何平
方宏新
Original Assignee
东莞新能源科技有限公司
宁德新能源科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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 EP14901535.6A priority Critical patent/EP3190645A4/en
Priority to CN201480081502.XA priority patent/CN106797014A/zh
Priority to JP2017508670A priority patent/JP2017533537A/ja
Priority to PCT/CN2014/086410 priority patent/WO2016037355A1/zh
Priority to KR1020177004930A priority patent/KR20170036004A/ko
Publication of WO2016037355A1 publication Critical patent/WO2016037355A1/zh
Priority to US15/444,196 priority patent/US20170170456A1/en

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Classifications

    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • 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
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • 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 device 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 8, there is a continuous coating 82, 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 8, the electrode area to be soldered on the pole piece 8 is first removed ( Or referred to as coating 82 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 82 on the pole piece 8 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 8 of the battery)
  • the fluid 81 is generally a copper foil and an aluminum foil having a thickness of several micrometers to ten micrometers.
  • the stress of the coating 82 is changed due to heat, which causes the pole piece 8 to be deformed, and the residual stress is removed after the coating 82 is removed.
  • the release pole piece 8 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 8 by ejecting a gas stream to effect cleaning and cooling of the pole piece 8.
  • 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.
  • Another object of the present application is to provide a pole piece coating removal apparatus that avoids pole piece deformation.
  • Another object of the present application is to provide a pole piece coating removal apparatus that can improve the energy utilization of laser cleaning, the quality of cleaning, and the efficiency of cleaning.
  • the present application provides a pole piece coating removing device, the pole piece comprising a current collector and a coating coated on at least one surface of the current collector, the pole piece coating removing device
  • the invention comprises: a transmission system for transmitting a pole piece of a coating to be removed; at least one wetting mechanism, each wetting mechanism being disposed on a surface of the pole piece to be removed of the pole piece conveyed by the conveying system, using a solvent wetting pole a coating on the surface of the sheet to be removed; a laser removal system; and a control system, a communication connection transmission system, a full wetting mechanism, a laser removal system.
  • the laser removal system includes: at least a laser emitting head that emits a laser beam and projects onto a coating on the pole piece that is wetted by the wetting mechanism on the corresponding surface to be removed, such that the area to be removed on the corresponding surface of the wetted pole piece is coated
  • the solvent of the layer is vaporized to break the coating of the area to be removed on the corresponding surface of the pole piece, thereby exposing the current collector at the area to be removed on the corresponding surface of the pole piece.
  • the coating on the pole piece to be removed is wetted in advance using a solvent, and the laser beam in the laser removing system is irradiated to the wetting.
  • the solvent present in the pole piece can directly or indirectly absorb the energy of the laser beam and instantaneously vaporize, or the particle of the coating absorbs the energy of the laser, and transfers the particles and the solvent through the interface.
  • the instantaneous temperature rise at the interface far exceeds the vaporization (evaporation) temperature of the solvent, forming an explosive evaporation of the solvent, which generates a strong transient pressure.
  • the particles of the coating are peeled off from the current collector, thereby reaching the shift.
  • the instantaneous pressure does not damage the pole piece, and the energy of the laser is absorbed directly or indirectly by the solvent, and the current collector of the pole piece is not damaged, and at the same time, since the coating on the pole piece is
  • the stress released after the coating is peeled off is small, thereby avoiding the deformation of the pole piece; in addition, the utilization of the energy of the laser cleaning and the quality of the cleaning can be improved. And the efficiency of cleaning.
  • FIG. 1 is a top plan view of an embodiment of a pole piece in a pole piece coating removal apparatus in accordance with 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 pole piece coating removal apparatus in accordance with the present application
  • Figure 4 is a front elevational view of Figure 3;
  • Figure 5 is a top plan view of an embodiment of a pole piece in a pole piece coating removal apparatus in accordance with the present application
  • Figure 6 is a front elevational view of Figure 5;
  • FIG. 7 is a schematic structural view of an embodiment of a pole piece coating removing device according to the present application.
  • FIG. 8 is a schematic structural view of an embodiment of a pole piece coating removing device according to the present application.
  • FIG. 9 is a schematic structural view of an embodiment of a pole piece coating removing device according to the present application.
  • Figure 10 is a schematic view showing the structure of an embodiment of a pole piece coating removing device according to the present application.
  • the pole piece 8 includes a current collector 81 and a coating 82 coated on at least one surface of the current collector 81
  • the pole piece The coating removal device comprises: a transport system 1 for transporting the pole pieces 8 of the coating 82 to be removed; at least one wetting mechanism 2, each wetting mechanism 2 being arranged in the pole piece 8 transported by the transport system 1 Removing a surface of the coating 82, using a solvent to wet the coating 82 of the region R to be removed on the one surface of the pole piece 8; the laser removal system 3; and the control system 4, the communication connection transmission system 1, Wet mechanism 2, laser removal system 3.
  • the laser removal system 3 comprises: at least one laser emitting head 31 that emits a laser beam and projects onto a coating 82 on the pole piece 8 that is to be removed on a corresponding surface wetted by the wetting mechanism 2 to infiltrate
  • the solvent of the coating 82 of the region R to be removed on the corresponding surface of the pole piece 8 is vaporized to break the coating 82 of the region R to be removed on the corresponding surface of the pole piece 8, thereby making the pair of pole pieces 8
  • the current collector 81 at the region R to be removed on the surface should be exposed.
  • the coating 82 of the region R to be removed on the pole piece 8 is wetted in advance using a solvent, in the laser removal system 3 After the laser beam is irradiated onto the wetted pole piece 8, the solvent present in the pole piece 8 can directly or indirectly absorb the energy of the laser beam and instantaneously vaporize, or the particles of the coating 82 absorb the energy of the laser and pass through the interface.
  • the heat causes the instantaneous temperature rise at the interface between the particles of the coating 82 and the solvent to exceed the vaporization (evaporation) temperature of the solvent, forming an explosive evaporation of the solvent, generating a strong transient pressure, and under the action of a large pressure, the coating
  • the particles of 82 are stripped from the current collector 81 to effect the removal of the particles of the coating 82.
  • the instantaneous pressure does not damage the pole piece 8, and the energy of the laser light is directly or indirectly absorbed by the solvent, and the current collector 81 of the pole piece 8 is not damaged, and at the same time, due to the pole piece 8
  • the coating 82 is removed by the pressure generated by the instantaneous vaporization of the solvent, and the stress released by the coating 82 after being peeled off is small, thereby avoiding deformation of the pole piece 8; in addition, the energy of the laser is solvent Absorbing directly or indirectly, can improve the utilization of energy for laser cleaning; explosive evaporation of a solvent that directly or indirectly absorbs laser energy can improve the quality of cleaning and the efficiency of cleaning.
  • the current collector 81 exposed from the coating 82 removal area of the pole piece 8 can be used to weld the tabs.
  • the pole piece material may be a pole piece of a supercapacitor, a pole piece of a lithium ion battery, the coating layer may be a positive electrode active material layer or a negative electrode active material layer
  • the coating layer may be a positive electrode active material layer or a negative electrode active material layer
  • the transport system 1 can include a unwinding roller 11 disposed upstream of the laser removal system 3 to provide and output a pole piece of the coating 82 to be removed. 8; a winding roller 12 disposed downstream of the laser removing system 3 to wind up the pole piece 8 of the removal coating 82; and a plurality of fixed rollers 13 disposed between the unwinding roller 11 and the winding roller 12 For guiding and conveying the pole piece 8.
  • the transport system 1 may further comprise a correcting mechanism 14 disposed downstream of the unwinding roller 11 for positioning the pole piece 8 of the coating 82 to be removed. Transfer location.
  • the laser removal system 3 may further include an inductor 32 disposed upstream of the wetting mechanism 2 for positioning a corresponding one of the pole pieces 8. The region R of the coating 82 on the surface to be removed.
  • the laser removal system 3 may further comprise: an adsorption fixing mechanism 33, the laser beam illuminating the pole piece 8 disposed in the laser removal system 3 to be moved
  • the area to be removed of the coating 82 on the corresponding one surface of the pole piece 8 is fixed except on the opposite surface of the corresponding one surface of the coating 82. Since the adsorption fixing mechanism 33 fixes the region R to be removed of the coating 82 on the corresponding one surface of the pole piece 8, the deformation problem of the pole piece 8 during laser removal is suppressed.
  • the laser removal system 3 may further comprise: a cooling mechanism 34, the laser beam illuminating the pole piece 8 disposed in the laser removal system 3 to be removed
  • the opposite surface of the corresponding surface of the coating 82 serves to absorb heat generated during the irradiation of the laser beam. Thereby, the problem of deformation of the pole piece 8 due to heat of the pole piece 8 during laser removal can be avoided.
  • the adsorption fixing mechanism 33 and the cooling mechanism 34 may be integrally formed, the adsorption fixing mechanism 33 may be a vacuum platform, and the cooling mechanism 34 may be disposed on the vacuum platform.
  • the pole piece coating removing device may further include: a dust removing mechanism 5 disposed on the pole piece 8 and Between the laser removal systems 3, on both sides of the region 82 of the coating 82 disposed on a corresponding surface of the pole piece 8, for removing the coating 82 particles generated during the laser removal process.
  • the dust removing mechanism 5 may be a vacuum suction type dust removing mechanism. Under the action of the suction type dust removing mechanism with a certain negative pressure, the removed particles enter the particle discharge pipe (not shown) of the dust removing mechanism 5, thereby ensuring that the particles do not remain on the pole piece 8 to avoid affecting the use of the pole piece.
  • the performance of 8 products such as supercapacitors or lithium-ion batteries) and prevents particles from polluting the environment.
  • the laser removal system 3 may further include a beam shaping mechanism 35 disposed between the laser emitting head 31 and the pole piece 8 and electrically connected to the laser.
  • the emitter 31 is used to homogenize the energy of the laser beam emitted by the laser emitting head 31.
  • the beam shaping mechanism 35 is capable of homogenizing the energy of the laser beam, thereby not damaging the current collector 81 of the pole piece 8, thereby improving the welding quality of the tabs; and not causing the residual of the coating 82, thereby improving the removal quality, and
  • the high energy and low energy in the laser beam can be effectively utilized, thereby maximizing the utilization of laser energy, thereby improving energy utilization, improving removal efficiency and removing quality.
  • Beam shaping mechanism 35 It is also possible to convert the spot into beams of different sizes and shapes, such as rectangles, squares, circles, ellipses and trapezoids.
  • the output laser beam can have different energy densities simply by adjusting the area of the spot according to the difficulty of removing the dirt or particles, thereby making it extremely removable.
  • the laser removal system 3 may further include a galvanometer scanning mechanism 36 disposed between the beam shaping mechanism 35 and the pole piece 8, electrically connected to Beam shaping mechanism 35.
  • the advantage of using the galvanometer scanning mechanism 36 is that the removal of the graphics is flexible, the scanning speed is high, the speed is stable, and the resolution of the movement is also high, which can make the positioning more accurate, can complete the fine removal, and improve the movement.
  • the removal quality is improved. Specifically, since the laser beam needs to be continuously accelerated and decelerated at the corner during the removal process, the moving speed of the laser beam is high during the removal process, and the galvanometer scanning mechanism 36 can realize the mobile positioning quickly and accurately. The dimensional accuracy, positioning accuracy, removal quality and stability of the removal are improved, and the laser system of the fixed laser emitting head cannot achieve such speed and accuracy. Therefore, the present application can be mass-produced in high quality and high speed in industrial applications.
  • the laser removal system 3 may further include a focusing mirror 37 disposed between the galvanometer scanning mechanism 36 and the pole piece 8.
  • the wetting mechanism 2 may be one corresponding to the pole piece 8 of the coating 82 to be removed which is transported by the transport system 1. a surface; and a laser emitting head 31, correspondingly disposed downstream of the one wetting mechanism 2, emitting a laser beam and projecting onto the corresponding piece of the surface of the pole piece 8 wetted by the wetting mechanism 2 to be moved In addition to the coating 82 of the region R.
  • This embodiment can be used for the work of removing the coating only on one surface of the pole piece 8, and the result of removing the coated pole piece 8 is as shown in Figs. 1 and 2. It can also be used for jobs that require removal of the coating on the opposite faces of the pole piece 8. The results of removing the coated pole piece 8 are shown in Figures 3 and 4, Figure 5 and Figure 6, but need Implemented through two processes.
  • the wetting mechanism 2 may be two, corresponding to the pole pieces of the coating 82 to be removed which are disposed on the conveying system 1 respectively.
  • This embodiment can be used for the work of removing the coating on the opposite surfaces of the pole piece 8, and the result of removing the pole piece 8 after coating is as shown in the figure. 3 and Figure 4, Figure 5 and Figure 6, and only need one process to achieve.
  • the wetting mechanism 2 may be two, respectively corresponding to the coating 82 to be removed which is disposed on the conveying system 1.
  • the two opposite surfaces of the pole piece 8; and the laser emitting head 31 are one; the laser removing system 3 may further include: at least one optical path switching mechanism 38 disposed between the laser emitting head 31 and the pole piece 8, For changing the transmission direction of the laser beam, so that the laser beam emitted from the laser emitting head 31 is sequentially or simultaneously projected onto the corresponding two opposite surfaces of the pole piece 8 wetted by the wetting mechanism 2 to be removed.
  • Coating 82 This embodiment can be used for the work of removing the coating on the opposite faces of the pole piece 8, and the result of removing the coated pole piece 8 is shown in Figures 3 and 4, 5 and 6, and It can be achieved in a single process.
  • the transport system 1 may further comprise a guide roller 15 for guiding and transporting the pole pieces 8 such that the opposite surfaces of the pole piece 8 are Flip, and the inverted pole piece 8 passes through the laser removal system 3; and the buffer roller 16 is disposed between the two wetting mechanisms 2, so that the opposite two surfaces of the pole piece 8 are subjected to the pole piece coating removal The transfer of the transitional pole piece 8 is smooth.
  • the guide roller 15 may be disposed such that the inverted pole piece 8 passed through the laser removing system 3 is again inverted to be conveyed to the winding roller 12.
  • the pole piece coating removing device may further include: a dust removing mechanism 6 disposed on the laser removing device Downstream of the system 3, a communication connection control system 4 is provided for removing particles and impurities remaining on the pole piece 8 removed by the coating 82.
  • the dusting mechanism 6 can be a sticky roller.
  • the pole piece coating removing device may further include: a quality monitoring system 7 disposed at the laser removing Downstream of the system 3, a communication connection control system 4 is provided for detecting the removal quality of the coating 82 of the pole piece 8 and feeding back the detection information to the control system 4. If the feedback to the control system 4 is not satisfactory, the next process or manual processing can be performed.
  • the communication connection may be a wired connection or a wireless connection.

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Abstract

一种极片涂层的移除装置，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，极片涂层的移除装置包括：传输系统，传输待移除涂层的极片；至少一个润湿机构，各润湿机构设置于传输系统输送的极片的待移除涂层的一个表面，使用溶剂润湿极片的该一个表面上的待移除区域的涂层；激光移除系统；控制系统，通信连接传输系统、全部润湿机构、激光移除系统。激光移除系统包括：至少一个激光发射头，发射激光束并投射到极片上的经过润湿机构润湿的对应表面上的待移除区域的涂层，使浸润极片的对应表面上的该待移除区域的涂层的溶剂气化，以击溃极片的对应表面上的待移除区域的涂层，使极片的对应表面上的该待移除区域处的集流体露出。

Description

极片涂层的移除装置 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装置。
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8上是连续的涂层82，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8上的焊接，首先要移除极片8上待焊接极耳区域(或者称之为待移除区域R)上的涂层82。而且，在一些特殊的电池生产工艺中，还需要在电池的极片8的不同位置移除不同形状的涂层82。例如，如图3和图4、图5和图6所示，有时还需要在极片8的两个表面上的对应位置移除待移除区域R上的涂层82。
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8上的涂层82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8的集流体81一般为铜箔和铝箔，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8的涂层82的过程中，在激光的作用下涂层82因受热，应力会发生变化，进而导致极片8变形，涂层82被去除后由于残余应力的释放极片8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8的移除后的区域，以实现对极片8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装置，其能避免极片受到损伤。
本申请的另一目的在于提供一种极片涂层的移除装置，其能避免极片变形。
本申请的另一目的在于提供一种极片涂层的移除装置，其能提高激光清洁的能量的利用率、清洁的质量、以及清洁的效率。
为了实现上述目的，本申请提供了一种极片涂层的移除装置，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，所述极片涂层的移除装置包括：传输系统，用于传输待移除涂层的极片；至少一个润湿机构，各润湿机构设置于传输系统输送的极片的待移除涂层的一个表面，使用溶剂润湿极片的该一个表面上的待移除区域的涂层；激光移除系统；以及控制系统，通信连接传输系统、全部润湿机构、激光移除系统。激光移除系统包括：至少 一个激光发射头，发射激光束并投射到极片上的经过润湿机构润湿的对应表面上的待移除区域的涂层，以使浸润极片的对应表面上的该待移除区域的涂层的溶剂气化，以击溃极片的对应表面上的待移除区域的涂层，从而使极片的对应表面上的该待移除区域处的集流体露出。
本申请的有益效果如下：
在根据本申请的极片涂层的移除装置中，通过设置润湿机构，使用溶剂提前将极片上的待移除区域的涂层润湿，在激光移除系统的激光束照射到润湿的极片上后，存在于极片中的溶剂能够直接或者间接地吸收激光束的能量而瞬间气化，或者涂层的颗粒吸收激光的能量，通过界面传热，使涂层的颗粒与溶剂的界面处的瞬间温升远超过溶剂的汽化(蒸发)温度,形成溶剂的爆炸性蒸发,产生很强的瞬态压力，在巨大压力的作用下，涂层的颗粒从集流体上剥离，从而达到移除涂层的颗粒的作用。由于压力是瞬间产生的，所以瞬时的压力不会伤到极片，并且激光的能量被溶剂直接或间接地吸收，极片的集流体不会受到损伤，同时，由于极片上的涂层是在溶剂瞬间气化产生的压力的作用下被移除的，涂层被剥离后释放出的应力很小，从而避免了极片的变形；此外，能提高激光清洁的能量的利用率、清洁的质量、以及清洁的效率。
附图说明
图1为根据本申请的极片涂层的移除装置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装置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装置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装置的一实施例的结构示意图；
图8为根据本申请的极片涂层的移除装置的一实施例的结构示意图；
图9为根据本申请的极片涂层的移除装置的一实施例的结构示意图；
图10为根据本申请的极片涂层的移除装置的一实施例的结构示意图。
其中，附图标记说明如下：
1传输系统      35光束整形机构
11放卷辊       36振镜扫描机构
12收卷辊       37聚焦镜
13固定辊       38光路切换机构
14纠偏机构     4控制系统
15导向辊       5除尘机构
16缓冲辊       6粘尘机构
2润湿机构      7质量监控系统
3激光移除系统  8极片
31激光发射头   81集流体
32感应器       82涂层
33吸附固定机构 R待移除区域
34冷却机构
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装置。
参照图1至图10，在根据本申请的极片涂层的移除装置中，极片8包括集流体81和涂覆在集流体81的至少一个表面上的涂层82，所述极片涂层的移除装置包括：传输系统1，用于传输待移除涂层82的极片8；至少一个润湿机构2，各润湿机构2设置于传输系统1输送的极片8的待移除涂层82的一个表面，使用溶剂润湿极片8的该一个表面上的待移除区域R的涂层82；激光移除系统3；以及控制系统4，通信连接传输系统1、润湿机构2、激光移除系统3。激光移除系统3包括：至少一个激光发射头31，发射激光束并投射到极片8上的经过润湿机构2润湿的对应表面上的待移除区域R的涂层82，以使浸润极片8的对应表面上的该待移除区域R的涂层82的溶剂气化，以击溃极片8的对应表面上的待移除区域R的涂层82，从而使极片8的对 应表面上的该待移除区域R处的集流体81露出。
在根据本申请的极片涂层的移除装置中，通过设置润湿机构2，使用溶剂提前将极片8上的待移除区域R的涂层82润湿，在激光移除系统3的激光束照射到润湿的极片8上后，存在于极片8中的溶剂能够直接或者间接地吸收激光束的能量而瞬间气化，或者涂层82的颗粒吸收激光的能量，通过界面传热，使涂层82的颗粒与溶剂的界面处的瞬间温升远超过溶剂的汽化(蒸发)温度,形成溶剂的爆炸性蒸发,产生很强的瞬态压力，在巨大压力的作用下，涂层82的颗粒从集流体81上剥离，从而达到移除涂层82的颗粒的作用。由于压力是瞬间产生的，所以瞬时的压力不会伤到极片8，并且激光的能量被溶剂直接或间接地吸收，极片8的集流体81不会受到损伤，同时，由于极片8上的涂层82是在溶剂瞬间气化产生的压力的作用下被移除的，涂层82被剥离后释放出的应力很小，从而避免了极片8的变形；此外，激光的能量被溶剂直接或间接地吸收，能提高激光清洁的能量的利用；被直接或间接地吸收激光能量的溶剂的爆炸性蒸发，可以提高清洁的质量以及清洁的效率。
在根据本申请的极片涂层中，极片8的涂层82移除区域露出的集流体81可用于焊接极耳。
在实际使用时，可以根据极片材料(极片可以为超级电容器的极片、锂离子电池的极片，涂层可以为正极活性材料层或负极活性材料层)的不同，采用本领域公知的不同系列的激光发射头31。
在传输系统1的一实施例中，参照图7至图10，传输系统1可包括：放卷辊11，设置在激光移除系统3的上游，提供并输出待移除涂层82的极片8；收卷辊12，设置在激光移除系统3的下游，将移除涂层82的极片8收卷；以及多个固定辊13，设置在放卷辊11和收卷辊12之间，用于导引并输送极片8。
在传输系统1的一实施例中，参照图7至图10，传输系统1还可包括：纠偏机构14，设置在放卷辊11下游，用于定位待移除涂层82的极片8的传输位置。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：感应器32，设置于润湿机构2的上游，用于定位极片8的对应一个 表面上的涂层82的待移除区域R。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：吸附固定机构33，设置在激光移除系统3的激光束照射极片8的待移除涂层82的对应一个表面的相反表面上，将极片8的该对应一个表面上的涂层82的待移除区域R固定。由于吸附固定机构33将极片8的该对应一个表面上的涂层82的待移除区域R固定，从而抑制极片8在激光移除过程中的变形问题。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：冷却机构34，设置在激光移除系统3的激光束照射极片8的待移除涂层82的对应一个表面的相反表面上，用于吸收激光束照射过程中产生的热量。从而，可以避免由于激光移除过程中极片8受热导致的极片8的变形的问题。
在根据本申请的极片涂层的移除装置的一实施例中，吸附固定机构33和冷却机构34可一体成型，吸附固定机构33可为真空平台，冷却机构34可为设置在该真空平台中的冷却管道。
在根据本申请的极片涂层的移除装置的一实施例中，参照图7至图10，所述极片涂层的移除装置还可包括：除尘机构5，设置于极片8和激光移除系统3之间，设置于极片8的对应一个表面上的涂层82的待移除区域R的两侧，用于清除在激光移除过程中产生的涂层82颗粒。在一实施例中，除尘机构5可为负压抽风式除尘机构。在有一定负压的抽风式除尘机构的作用下，被去除的颗粒进入除尘机构5的颗粒排出管道(未示出)，从而可以保证颗粒不会残留在极片8上以避免影响使用极片8的产品(例如超级电容器或锂离子电池)的性能且能防止颗粒污染环境。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：光束整形机构35，设置在激光发射头31与极片8之间，电连接于激光发射头31，用于匀化激光发射头31发射的激光束的能量。光束整形机构35能够将激光束的能量均匀化，既不会伤害极片8的集流体81，从而提高极耳的焊接质量；又不会造成涂层82的残留，从而提高移除质量，而且激光束中的高能量和低能量能够被有效的利用，从而实现激光能量的最大化利用，进而提高能量的利用率，提高移除效率和移除质量。光束整形机构35 还可以将光斑转化为不同尺寸、不同形状的光束，例如长方形、正方形、圆形、椭圆形和梯形等。当能量一定时，可以根据污物或微粒被移除的难易程度，简单的通过调整光斑的面积来使输出的激光束具有不同的能量密度，从而使其具有极高的移除能力。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：振镜扫描机构36，设置于光束整形机构35和极片8之间，电连接于光束整形机构35。采用振镜扫描机构36的优点是：移除图形柔性较大，能达到的扫描速度大、速度稳定，移动的分辨率也较高，能够使定位更加的准确，能够完成精细移除，提高移除尺寸的精度和稳定性，提高移除质量。具体而言，由于在移除过程中激光束在拐角处需要不停的加速、减速，移除过程中激光束的移动速度较高，振镜扫描机构36能够快速准确的实现移动定位，这样能够提高移除的尺寸精度、定位精度、移除质量和稳定性，而固定激光发射头的激光系统无法达到这样的速度和精度。所以本申请能在工业应用中高质量、高速度地量产化。
在激光移除系统3的一实施例中，参照图7至图10，激光移除系统3还可包括：聚焦镜37，设置在振镜扫描机构36和极片8之间。
在根据本申请的极片涂层的移除装置的一实施例中，参照图7，润湿机构2可为一个，对应设置于传输系统1输送的待移除涂层82的极片8的一个表面；以及激光发射头31为一个，对应设置在该一个润湿机构2的下游，发射激光束并投射到极片8上的经过润湿机构2润湿的该对应一个表面上的待移除区域R的涂层82。本实施例可用于只需要在极片8的一个表面上移除涂层的作业，移除涂层后的极片8的结果如图1和图2所示。也可以用于需要在极片8的两个相反表面上移除涂层的作业，移除涂层后的极片8的结果如图3和图4、图5和图6所示，但是需要经过两次流程实现。
在根据本申请的极片涂层的移除装置的一实施例中，参照图8，润湿机构2可为两个，分别对应设置于传输系统1输送的待移除涂层82的极片8的两个相反的表面；以及激光发射头31为两个，分别对应设置在两个润湿机构2的下游，分别发射激光束并投射到极片8上的经过润湿机构2润湿的对应的两个相反表面上的待移除区域R的涂层82。本实施例可用于需要在极片8的两个相反表面上移除涂层的作业，移除涂层后的极片8的结果如图 3和图4、图5和图6所示，而且仅需要一次流程即能实现。
在根据本申请的极片涂层的移除装置的一实施例中，参照图9和图10，润湿机构2可为两个，分别对应设置于传输系统1输送的待移除涂层82的极片8的两个相反的表面；以及激光发射头31为一个；所述激光移除系统3还可包括：至少一个光路切换机构38，设置于激光发射头31与极片8之间，用于改变激光束的传输方向，以使激光发射头31发射的激光束依次或同时投射到极片8上的经过润湿机构2润湿的对应的两个相反表面上的待移除区域R的涂层82。本实施例可用于需要在极片8的两个相反表面上移除涂层的作业，移除涂层后的极片8的结果如图3和图4、图5和图6所示，而且仅需要一次流程即能实现。
在传输系统1的一实施例中，参照图7至图10，传输系统1还可包括：导向辊15，用于导引并输送极片8，以使极片8的相反的两个表面进行翻转，并使翻转后的极片8通过激光移除系统3；以及缓冲辊16，设置在两个润湿机构2之间，使极片8的相反的两个表面进行极片涂层移除时平缓过渡极片8的输送。此外，参照图8，导向辊15还可以设置成使通过激光移除系统3的翻转后的极片8再次进行翻转，以向收卷辊12输送。
在根据本申请的极片涂层的移除装置的一实施例中，参照图7至图10，所述极片涂层的移除装置还可包括：粘尘机构6，设置于激光移除系统3的下游，通信连接控制系统4，用于清除涂层82移除的极片8上残留的颗粒及杂质。在一实施例中，粘尘机构6可为粘尘辊。
在根据本申请的极片涂层的移除装置的一实施例中，参照图7至图10，所述极片涂层的移除装置还可包括：质量监控系统7，设置在激光移除系统3的下游，通信连接控制系统4，用于检测极片8的涂层82移除质量并将检测信息反馈给控制系统4。如果反馈给控制系统4的移除效果不理想，则可以进行下一次流程或进行人工处理。
在根据本申请的极片涂层的移除装置中，通信连接可为有线连接或无线连接。

Claims (21)

  1. 一种极片涂层的移除装置，极片(8)包括集流体(81)和涂覆在集流体(81)的至少一个表面上的涂层(82)，其特征在于，所述极片涂层的移除装置包括：
    传输系统(1)，用于传输待移除涂层(82)的极片(8)；
    至少一个润湿机构(2)，各润湿机构(2)设置于传输系统(1)输送的极片(8)的待移除涂层(82)的一个表面，使用溶剂润湿极片(8)的该一个表面上的待移除区域(R)的涂层(82)；
    激光移除系统(3)，包括：
    至少一个激光发射头(31)，发射激光束并投射到极片(8)上的经过润湿机构(2)润湿的对应表面上的待移除区域(R)的涂层(82)，以使浸润极片(8)的对应表面上的该待移除区域(R)的涂层(82)的溶剂气化，以击溃极片(8)的对应表面上的待移除区域(R)的涂层(82)，从而使极片(8)的对应表面上的该待移除区域(R)处的集流体(81)露出；以及
    控制系统(4)，通信连接传输系统(1)、全部润湿机构(2)、激光移除系统(3)。
  2. 根据权利要求1所述的极片涂层的移除装置，其特征在于，传输系统(1)包括：
    放卷辊(11)，设置在激光移除系统(3)的上游，提供并输出待移除涂层(82)的极片(8)；
    收卷辊(12)，设置在激光移除系统(3)的下游，将移除涂层(82)的极片(8)收卷；以及
    多个固定辊(13)，设置在放卷辊(11)和收卷辊(12)之间，用于导引并输送极片(8)。
  3. 根据权利要求1所述的极片涂层的移除装置，其特征在于，传输系统(1)还包括：
    纠偏机构(14)，设置在放卷辊(11)下游，用于定位待移除涂层(82)的极片(8)的传输位置。
  4. 根据权利要求1所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    感应器(32)，设置于润湿机构(2)的上游，用于定位极片(8)的对应一个表面上的涂层(82)的待移除区域(R)。
  5. 根据权利要求1所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    吸附固定机构(33)，设置在激光移除系统(3)的激光束照射极片(8)的待移除涂层(82)的对应一个表面的相反表面上，将极片(8)的该对应一个表面上的涂层(82)的待移除区域(R)固定。
  6. 根据权利要求1所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    冷却机构(34)，设置在激光移除系统(3)的激光束照射极片(8)的待移除涂层(82)的对应一个表面的相反表面上，用于吸收激光束照射过程中产生的热量。
  7. 根据权利要求5所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：冷却机构(34)，设置在激光移除系统(3)的激光束照射极片(8)的待移除涂层(82)的对应一个表面的相反表面上，用于吸收激光束照射过程中产生的热量。
  8. 根据权利要求7所述的极片涂层的移除装置，其特征在于，吸附固定机构(33)和冷却机构(34)一体成型，吸附固定机构(33)为真空平台，冷却机构(34)为设置在该真空平台中的冷却管道。
  9. 根据权利要求1所述的极片涂层的移除装置，其特征在于，所述极片 涂层的移除装置还包括：
    除尘机构(5)，设置于极片(8)和激光移除系统(3)之间，设置于极片(8)的对应一个表面上的涂层(82)的待移除区域(R)的两侧，用于清除在激光移除过程中产生的涂层(82)颗粒。
  10. 根据权利要求9所述的极片涂层的移除装置，其特征在于，除尘机构(5)为负压抽风式除尘机构。
  11. 根据权利要求1所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    光束整形机构(35)，设置在激光发射头(31)与极片(8)之间，电连接于激光发射头(31)，用于匀化激光发射头(31)发射的激光束的能量。
  12. 根据权利要求11所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    振镜扫描机构(36)，设置于光束整形机构(35)和极片(8)之间，电连接于光束整形机构(35)。
  13. 根据权利要求12所述的极片涂层的移除装置，其特征在于，激光移除系统(3)还包括：
    聚焦镜(37)，设置在振镜扫描机构(36)和极片(8)之间。
  14. 根据权利要求1所述的极片涂层的移除装置，其特征在于，
    润湿机构(2)为一个，对应设置于传输系统(1)输送的待移除涂层(82)的极片(8)的一个表面；以及
    激光发射头(31)为一个，对应设置在该一个润湿机构(2)的下游，发射激光束并投射到极片(8)上的经过润湿机构(2)润湿的该对应一个表面上的待移除区域(R)的涂层(82)。
  15. 根据权利要求1所述的极片涂层的移除装置，其特征在于，
    润湿机构(2)为两个，分别对应设置于传输系统(1)输送的待移除涂层(82)的极片(8)的两个相反的表面；以及
    激光发射头(31)为两个，分别对应设置在两个润湿机构(2)的下游，分别发射激光束并投射到极片(8)上的经过润湿机构(2)润湿的对应的两个相反表面上的待移除区域(R)的涂层(82)。
  16. 根据权利要求1所述的极片涂层的移除装置，其特征在于，
    润湿机构(2)为两个，分别对应设置于传输系统(1)输送的待移除涂层(82)的极片(8)的两个相反的表面；以及
    激光发射头(31)为一个；
    所述激光移除系统(3)还包括：
    至少一个光路切换机构(38)，设置于激光发射头(31)与极片(8)之间，用于改变激光束的传输方向，以使激光发射头(31)发射的激光束依次或同时投射到极片(8)上的经过润湿机构(2)润湿的对应的两个相反表面上的待移除区域(R)的涂层(82)。
  17. 根据权利要求15或16所述的极片涂层的移除装置，其特征在于，传输系统(1)还包括：
    导向辊(15)，用于导引并输送极片(8)，以使极片(8)的相反的两个表面进行翻转，并使翻转后的极片(8)通过激光移除系统(3)；以及
    缓冲辊(16)，设置在两个润湿机构(2)之间，使极片(8)的相反的两个表面进行极片涂层移除时平缓过渡极片(8)的输送。
  18. 根据权利要求1所述的极片涂层的移除装置，其特征在于，所述极片涂层的移除装置还包括：
    粘尘机构(6)，设置于激光移除系统(3)的下游，通信连接控制系统(4)，用于清除涂层(82)移除的极片(8)上残留的颗粒及杂质。
  19. 根据权利要求18所述的极片涂层的移除装置，其特征在于，粘尘机构(6)为粘尘辊。
  20. 根据权利要求1所述的极片涂层的移除装置，其特征在于，所述极片涂层的移除装置还包括：
    质量监控系统(7)，设置在激光移除系统(3)的下游，通信连接控制系统(4)，用于检测极片(8)的涂层(82)移除质量并将检测信息反馈给控制系统(4)。
  21. 根据权利要求1、18或20所述的极片涂层的移除装置，其特征在于，通信连接为有线连接或无线连接。
PCT/CN2014/086410 2014-09-12 2014-09-12 极片涂层的移除装置 WO2016037355A1 (zh)

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