WO2010111851A1 - 极片加工方法 - Google Patents

极片加工方法 Download PDF

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Publication number
WO2010111851A1
WO2010111851A1 PCT/CN2009/072829 CN2009072829W WO2010111851A1 WO 2010111851 A1 WO2010111851 A1 WO 2010111851A1 CN 2009072829 W CN2009072829 W CN 2009072829W WO 2010111851 A1 WO2010111851 A1 WO 2010111851A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutting
pole piece
electrode plate
current collector
processing method
Prior art date
Application number
PCT/CN2009/072829
Other languages
English (en)
French (fr)
Inventor
许光宁
徐国根
李建强
Original Assignee
深圳市吉阳自动化科技有限公司
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 深圳市吉阳自动化科技有限公司 filed Critical 深圳市吉阳自动化科技有限公司
Publication of WO2010111851A1 publication Critical patent/WO2010111851A1/zh

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Classifications

    • 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
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • 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 present invention relates to a battery manufacturing technique, and more particularly to a pole piece production and processing method.
  • the widely used battery cells need to cut the pole pieces of the battery core from the coil material by mechanical cutting to the length required for the lamination before lamination.
  • the pole piece is coated with a polar material such as graphite or lithium cobalt oxide, mechanical cutting causes the pole piece to generate dust after being cut.
  • the mechanical cutting will also produce burrs at the mouth of the pole piece. The burr may puncture the diaphragm between the positive and negative electrodes, causing the battery to short-circuit the positive and negative terminals, and the battery explosion may occur in severe cases.
  • the life of the mechanical cutter is affected by the material of the pole piece.
  • the mechanical cutter is not suitable for the cutting of the pole piece whose irregular shape is irregular.
  • the mechanical cutting method is used to deform the pole piece or to make the meandering curve large, and a great tangential force is generated at the moment of cutting to change the crystal phase structure of the pole piece, thereby affecting the performance of the battery.
  • the main object of the present invention is to provide a method for processing a pole piece that is stable and reliable in process.
  • the present invention proposes a pole piece processing method in which a pole piece or a current collector is cut along a predetermined cutting path by a laser.
  • the pole piece processing method comprises the steps of: coating a polar active material on the current collector; and performing cutting with a laser according to a predetermined size and shape.
  • the cutting process used in the invention is dust-free, and no burr is generated at the mouth of the pole piece after cutting, and is particularly suitable for cutting the pole piece with irregular shape of the fracture, and the pole during the cutting process No film It will be subjected to mechanical force, no mechanical stress will be generated inside the pole piece, and the crystal phase structure of the pole piece will not change.
  • the method of the invention can ensure the process stability of the pole piece cutting, and is beneficial to improve the quality of the battery and the battery. Pass rate.
  • FIG. 1 is a schematic view of the battery pole piece before it is cut
  • FIG. 2 is a schematic view showing a battery pole piece after cutting the battery pole piece shown in Fig. 1 by the method of the present invention.
  • the battery pole piece production process of this example includes: equipped with a polar active material, a current collector coated polar active material, baked, and cut according to the required size and shape to obtain a desired battery pole piece.
  • the pole piece cutting method uses a laser cutting device to cut the pole piece.
  • the battery pole piece shown in Fig. 1 is cut, and the laser cutting device is used to place the laser of the laser cutting device outside a certain distance of the pole piece, and the focal length of the laser is adjusted to focus the laser on the cutting position on the pole piece.
  • the driving mechanism drives the laser to operate according to a predetermined trajectory.
  • the trajectory of the laser running ie, the laser cutting route
  • the trajectory of the laser running is matched with the shape of the pole piece cutting fracture 3, and the pole piece is melted by the laser energy to obtain the pole piece opening 3 of a predetermined shape.
  • the starting point of the cutting may be started from the current collector 1 or from the polar active material layer 2, and the battery pole piece cut by the battery pole piece cutting method of this example is shown in Fig. 2.
  • the battery pole piece cutting method of this example is a non-physical contact cutting method, the cutting process is dust-free, and there is no burr at the pole piece mouth 3 after cutting, even if there is a burr, it is very small, and there is no mechanical cutting in the prior art.
  • the method causes a large burr in the cutting fracture and a battery short circuit in the rupture of the diaphragm; no mechanical force acts on the current collector 1 and the polar active material layer 2 during the cutting process, so the current collector 1 and the polar active material layer 2 are not Mechanical stress is generated, and the crystal phase structure in the polar active material layer 2 does not change; the pole piece is not deformed by the force.
  • the battery pole piece cutting method of this example improves the process stability of the battery pole piece production, directly improves the performance of the produced pole piece, and the battery yield rate can be greatly improved.
  • the battery pole piece production process of this example includes: equipped with a polar active material, according to the required size and shape
  • the current collector is cut, and the polar active material is coated on the cut current collector and baked to obtain a desired battery pole piece.
  • the current collector is cut with a laser cutting device.
  • the battery pole piece cutting method of this example improves the process stability of the battery pole piece production, directly improves the performance of the produced pole piece, and the battery yield rate can be greatly improved.
  • the trajectory of the laser operation can be set according to the specific shape of the required pole piece cutting fracture, which can be straight lines, rectangles, circles, and other irregular trajectories.
  • the method of the present invention is carried out, and laser cutting may be performed before the current collector coats the polar active material, or after the current collector coats the polar active material.
  • the laser cutting is carried out after the polar sheet is coated with the polar active material, and the cutting can be started from the polar active material layer or from the current collector.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Description

说明书 极片加工方法
技术领域
[1] 本发明涉及电池制造技术， 尤其是一种极片生产加工方法。
背景技术
[2] 目前广泛应用的电芯， 特别是动力电池的电芯叠片技术在叠片前都需要将电芯 的极片由成卷的材料通过机械切割方式切断成叠片需要的长度。 由于极片上涂 布有极性材料， 如石墨、 钴酸锂等， 机械切割会导致极片在被切断吋产生粉尘 。 除此之外， 机械切断也会在极片断口处产生毛刺， 毛刺可能扎破正负极片之 间的隔膜而导致电池正负极短路， 严重吋会发生电池爆炸。 而且机械切刀的寿 命会受极片材料的影响， 在使用一段吋间后需要维护， 维护和维修成本较高， 且机械切刀不适于断口为不规则的异形形状的极片的切割。 另外， 釆用机械切 割方法， 使极片产生变形或者使其蛇行弯变大， 在切断的瞬间还会产生极大的 切向力使极片的晶相组织产生变化， 从而影响电池的性能。
对发明的公开
技术问题
[3] 本发明的主要目的是： 提供一种工艺稳定可靠的极片加工方法。
技术解决方案
[4] 为此， 本发明提出一种极片加工方法， 釆用激光沿预定切割路线对极片或集流 体进行切割。
[5] 进一步地， 该极片加工方法， 包括如下步骤： 于集流体上涂布极性活性物质； 按预定尺寸形状要求用激光进行切割。
或包括如下步骤： 按预定尺寸形状要求用激光切割集流体， 在经切割后的集流 体上涂布极性活性物质。
有益效果
[6] 本发明的有益效果是： 本发明釆用的切割过程无粉尘， 切割后极片断口处不产 生毛刺， 尤其适于断口为不规则的异形形状的极片的切割， 切割过程中极片不 会受到机械力的作用， 极片内部不会产生机械应力， 也不会使极片的晶相组织 产生变化； 本发明方法可以保证极片切割的工艺稳定性， 有利于提高电芯质量 和电池合格率。
附图说明
[7] 下面通过具体实施方式并结合附图， 对本发明作进一步的详细说明：
[8] 图 1是电池极片未切割前的示意图；
[9] 图 2是釆用本发明方法对图 1所示电池极片进行切割后的电池极片示意图。
本发明的实施方式
[10] 实施例一
[11] 本例的电池极片生产工艺， 包括： 配备极性活性物质， 集流体涂布极性活性物 质， 烘烤， 按照所需要的尺寸和形状进行切割， 得到所需要的电池极片。 本例 的极片切割方法， 釆用激光切割设备进行极片的切割。
[12] 其中， 对图 1所示电池极片进行切割， 釆用激光切割设备， 将激光切割设备的 激光器置于极片一定距离之外， 调整激光器的焦距使激光聚焦到极片上的切割 位置， 驱动机构驱动激光器按照预定的轨迹运行， 激光器运行的轨迹 （即激光 切割路线） 与极片切割断口 3的形状相适配， 极片被激光能量熔断， 得到预定形 状的极片断口 3。 切割的起点可以由集流体 1处开始， 也可以由极性活性物质层 2 处开始， 釆用本例的电池极片切割方法切割得到的电池极片如图 2所示。
[13] 本例的电池极片切割方法为非物理接触的切割方式， 切割过程无粉尘， 切割后 极片断口 3处没有毛刺， 即使存在毛刺也非常小， 不会出现现有技术中机械切割 方式在切割断口产生大毛刺、 扎破隔膜发生电池短路的情况； 切割过程中没有 机械力作用到集流体 1和极性活性物质层 2上， 所以集流体 1和极性活性物质层 2 中不会产生机械应力， 极性活性物质层 2中的晶相组织不会发生变化； 极片不会 因受力而发生变形。
[14] 本例的电池极片切割方法提高了电池极片生产的工艺稳定性， 直接提高了所生 产出来的极片的性能， 使电池的合格率也能得到大幅度的提高。
[15] 实施例二
[16] 本例的电池极片生产工艺， 包括： 配备极性活性物质， 按照所需要的尺寸和形 状切割集流体， 在经切割后的集流体上涂布极性活性物质， 烘烤， 得到所需要 的电池极片。 本例釆用激光切割设备对集流体进行切割。
[17] 切割后集流体切割处没有毛刺， 即使存在毛刺也非常小， 不会出现现有技术中 机械切割方式在切割断口产生大毛刺、 扎破隔膜发生电池短路的情况； 切割过 程中没有机械力作用到集流体上， 所以集流体中不会产生机械应力， 不会因受 力而发生变形。
[18] 本例的电池极片切割方法提高了电池极片生产的工艺稳定性， 直接提高了所生 产出来的极片的性能， 使电池的合格率也能得到大幅度的提高。
[19] 以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不能认 定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通技术 人员来说， 在不脱离本发明构思的前提下， 还可以做出若干简单推演或替换， 都应当视为属于本发明的保护范围。 例如， 激光器运行的轨迹根据需要的极片 切割断口的具体形状设定， 可以是直线、 矩形、 圆形以及其它异形轨迹。 具体 实施本发明方法吋， 激光切割可在集流体涂布极性活性物质之前进行， 也可在 集流体涂布极性活性物质之后进行。 激光切割在极片涂布极性活性物质之后进 行吋， 可以由极性活性物质层处开始切割， 也可以由集流体处开始切割。

Claims

权利要求书
[1] 一种极片加工方法， 其特征在于： 釆用激光沿预定切割路线对极片或集流 体进行切割。
[2] 如权利要求 1所述的极片加工方法， 其特征在于： 包括如下步骤： 于集流体 上涂布极性活性物质； 釆用激光按预定尺寸形状要求对极片进行切割。
[3] 如权利要求 1所述的极片加工方法， 其特征在于： 包括如下步骤： 按预定尺 寸形状要求用激光切割集流体， 在经切割后的集流体上涂布极性活性物质
[4] 如权利要求
3所述的极片加工方法， 其特征在于： 所述切割路线的起点选择于极片的极 性活性物质层。
[5] 如权利要求 3所述的极片加工方法， 其特征在于： 所述切割路线的起点选择
PCT/CN2009/072829 2009-03-31 2009-07-20 极片加工方法 WO2010111851A1 (zh)

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CN110561553A (zh) * 2019-10-18 2019-12-13 深圳吉阳智能科技有限公司 一种极片隔膜袋切割装置和极片隔膜袋切割系统
CN114242952A (zh) * 2021-12-17 2022-03-25 蜂巢能源科技(无锡)有限公司 一种锂离子电池电极极片成型方法及成型装置

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CN102205469A (zh) * 2010-03-31 2011-10-05 深圳市先阳软件技术有限公司 一种对电池极片进行激光切割的控制方法及系统
KR101199161B1 (ko) * 2011-02-11 2012-11-12 삼성에스디아이 주식회사 전극 조립체 및 이를 이용한 이차 전지
CN102642091A (zh) * 2012-03-01 2012-08-22 宁波子煜自动化设备开发有限公司 一种用于电极涂布的切割方法
KR102261800B1 (ko) * 2017-11-20 2021-06-04 주식회사 엘지화학 비정형 전극의 제조 방법
CN108963318A (zh) * 2018-07-23 2018-12-07 深圳市聚和源科技有限公司 一种异形锂电池及其制备方法
CN109926737B (zh) * 2019-04-12 2021-06-08 无锡先导智能装备股份有限公司 极耳成型方法
DE102019209183A1 (de) * 2019-06-25 2020-12-31 Volkswagen Aktiengesellschaft Verfahren zur Herstellung von Batterieelektroden
CN114633035B (zh) * 2022-05-11 2022-08-12 东莞市盛雄激光先进装备股份有限公司 一种正极极片的制片方法、制片系统及正极极片

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CN110561553A (zh) * 2019-10-18 2019-12-13 深圳吉阳智能科技有限公司 一种极片隔膜袋切割装置和极片隔膜袋切割系统
CN110561553B (zh) * 2019-10-18 2024-02-02 深圳吉阳智能科技有限公司 一种极片隔膜袋切割装置和极片隔膜袋切割系统
CN114242952A (zh) * 2021-12-17 2022-03-25 蜂巢能源科技(无锡)有限公司 一种锂离子电池电极极片成型方法及成型装置
CN114242952B (zh) * 2021-12-17 2023-12-08 蜂巢能源科技(无锡)有限公司 一种锂离子电池电极极片成型方法及成型装置

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