WO2010111852A1 - 电池极片加工方法、电池极片及电池 - Google Patents

电池极片加工方法、电池极片及电池 Download PDF

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Publication number
WO2010111852A1
WO2010111852A1 PCT/CN2009/072833 CN2009072833W WO2010111852A1 WO 2010111852 A1 WO2010111852 A1 WO 2010111852A1 CN 2009072833 W CN2009072833 W CN 2009072833W WO 2010111852 A1 WO2010111852 A1 WO 2010111852A1
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Prior art keywords
current collector
battery
pole piece
tab
processing
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PCT/CN2009/072833
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English (en)
French (fr)
Inventor
许光宁
徐国根
李建强
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深圳市吉阳自动化科技有限公司
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Publication of WO2010111852A1 publication Critical patent/WO2010111852A1/zh

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • H01M50/536Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Definitions

  • the present invention relates to a battery manufacturing technique, and more particularly to a method of processing a tab having good performance.
  • the battery pole piece and the tab are relatively independent, and the ear processing requires a single roll of the tab discharge, mechanical cutting into a strip shape, and then welding to the current collector of the battery pole piece. The corresponding position on it.
  • FIGs 1 and 2 show the situation after the tab 2 is welded to the current collector 10. Before the winding of the cell, it is necessary to perform mechanical cutting of the tab 2, soldering the tab 2 to the current collector 10, soldering the tab 2 to the current collector 10, and then attaching the protective tape. On the one hand, many processes affect the improvement of production efficiency, and also bring some unstable quality influence factors, such as poor soldering, virtual soldering, false soldering, leakage of protective tape, bubbles on the protective tape, etc., to ensure battery performance. Stability is very unfavorable.
  • the main object of the present invention is: Firstly, an efficient and reliable pole piece processing method is provided; secondly, a battery pole piece and a battery having stable and reliable performance are provided.
  • the present invention provides a battery pole piece processing method, including steps
  • the laser is used for cutting.
  • the present invention proposes a battery pole piece comprising a current collector which extends at the edge to a raised portion for use as a tab. Or a battery pole piece, comprising a current collector, the current collector extending from the edge at the edge for achieving a welded connection with the current collector of the other battery pole piece.
  • the present invention provides a battery including a polarity lead and a pole piece, the pole piece including a current collector, the current collector extending a convex portion at an edge; the convex portion and the convex portion The polar bow I line is connected.
  • the beneficial effects of the present invention are: ⁇ Using the pole piece processing method of the present invention, the convex portion is directly processed on the current collector as a tab, and the tab is a part of the current collector, completely avoiding the possibility of the conventional processing. Process defects such as poor soldering, soldering, false soldering, protective tape leakage, and air bubbles on the protective tape appear to improve the stability and reliability of the battery performance.
  • the processing method of the invention simplifies the processing process, and the processes of mechanical cutting of the ear in the prior art, welding of the tabs to the current collector, welding of the tabs to the current collector, and the protection of the tape are completely eliminated. It avoids the process defects that may occur in the traditional processing process; improves production efficiency and saves costs.
  • the battery of the present invention directly processes the convex portion on the current collector as a tab, and the tab is a part of the current collector, which improves the stability and reliability of the battery. Since the processing process in the prior art is omitted, the process defects that may occur in the conventional processing process are completely avoided, and the overall performance of the battery is improved; the production efficiency is improved and the cost is saved.
  • the present invention can be implemented by adding a laser cutting device to a corresponding position on an existing winding line, so that the pole piece processing and the core winding can be continuously performed on the same line.
  • Figure 1 is a front elevational view of a pole piece obtained by a prior art processing method
  • Figure 2 is a plan view of the pole piece shown in Figure 1;
  • FIG. 3 is a plan view of a pole piece before laser cutting in a pole piece processing process according to an embodiment of the present invention
  • FIG. 4 is a plan view of the pole piece of FIG. 3 after laser cutting
  • Figure 5 is a front elevational view of the pole piece shown in Figure 4.
  • the basic structure and working principle of the lithium ion battery are basically the same as those in the prior art, including: a battery pole piece, an electrolyte, a separator, a positive electrode lead, a negative electrode lead, a center terminal, a safety valve, a sealing port, and Battery case, etc.
  • the battery pole piece includes a positive electrode sheet including a positive electrode current collector and a positive electrode active material coated on the positive electrode current collector, and the negative electrode plate includes a negative electrode current collector and a negative current collector A negative electrode active material on the body.
  • the main difference between the lithium ion battery in this example and the prior art is that, in this example, the structure of the positive electrode sheet and the negative electrode sheet is not separately connected to the structure of the tab, but is formed by the current collector at the edge. As a connection point for connecting and extracting the polarity leads of the pole pieces, the part realizes the function of the ear in the prior art.
  • the plurality of positive electrode sheets are connected to each other through the convex portion on the positive electrode current collector and are in contact with the positive electrode lead, and the plurality of negative electrode sheets are brought into contact with the convex portion on the negative electrode current collector and are in contact with the negative electrode lead.
  • the convex part processed at the edge of the current collector may be referred to as the conventional ear, and is still called the polar ear.
  • the specific process of processing the tabs of this example includes:
  • a certain width of the tab processing belt 12 is determined at the lower edge of the current collector 10, the width of the tab processing belt 12 is d, and the upper region of the tab processing belt 12 is non-polar.
  • the processing belt is coated with the active material 11;
  • the torch is used to cut the current collecting strip 10 of the current collector 10 to obtain a tab 13 with the current collector 10, see Figs. 4 and 5.
  • the current collector 10 is a unitary body, and the current collector 10 is divided into two regions: a strip-shaped region near the edge position is a tab processing belt 12, and a tabular processing belt 12 is above the non-ear tab.
  • the processing belt is a slurry coating zone for coating the active material 11.
  • six tabs 13 are formed directly on the tab processing strip 12 on the current collector 10 (see Figure 4). Comparing Figures 3 and 4, the laser cuts the current collector foil at the corresponding position of the tab processing belt 12, and the remainder is the processed tabs 13 .
  • the tab 13 is integral with the current collector 10, that is, the tab 13 is actually a convex portion extending from the edge of the current collector 10, it can be said that the battery pole piece in this example does not need to be additionally provided with a tab.
  • the electrical connection can be made directly by welding the raised portions on the current collector.
  • Laser processing is different from mechanical cutting in that the processed tab 13 is free of burrs, which helps to improve the core quality; since the tab 13 is directly processed on the current collector 10, the tab 13 is processed, eliminating the prior art.
  • the mechanical cutting of the ear, the welding of the tabs to the current collector, the welding of the tabs to the current collector and the application of the protective tape avoiding the process defects that may occur in the conventional process, simplifying the processing, and facilitating the production efficiency. , save costs.
  • the above-mentioned polar processing can be achieved by adding a laser cutting device to the corresponding position on the existing winding line, which allows the processing of the tabs and the winding of the cells on the same line.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

电池极片加工方法、 电池极片及电池
技术领域
[1] 本发明涉及电池制造技术, 尤其是一种性能良好的极耳加工方法。
背景技术
[2] 现有技术中, 电池极片和极耳是相对独立的, 极耳加工中需要经过单独成卷的 极耳放料, 机械切割成片条状, 再焊接到电池极片的集流体上的相应位置。
[3] 图 1和图 2示出了极耳 2焊接到集流体 10上之后的情形。 在电芯卷绕之前, 需要 进行极耳 2的机械切割、 将极耳 2焊接到集流体 10上、 极耳 2焊接到集流体 10上后 贴保护胶布等工序。 工序繁多一方面影响生产效率的提高, 另外会带来一些不 稳定的质量影响因素, 例如焊接不良、 虚焊、 假焊、 保护胶带漏贴、 保护胶带 上有气泡等工艺缺陷, 对保证电池性能稳定非常不利。
对发明的公开
技术问题
[4] 本发明的主要发明目的是: 首先, 提供一种高效可靠的极片加工方法; 其次, 提供一种性能稳定可靠的电池极片和电池。
技术解决方案
[5] 为解决上述技术问题, 首先, 本发明提出了一种电池极片加工方法, 包括步骤
: 11) 在集流体的边缘处预留一定宽度的极耳加工带; 12) 按照需要的位置、 尺寸和形状, 切割集流体的极耳加工带, 得到与集流体一体的极耳。
[6] 上述的电池极片加工方法, 在所述步骤 11) 之前, 在所述步骤 12) 之后, 还包 括以下步骤: 在集流体上的非极耳加工带涂布活性物质; 或在所述步骤 12) 之 后, 还包括以下步骤: 在集流体上的非极耳加工带涂布活性物质。
上述的电池极片加工方法, 在所述步骤 12) 中, 釆用激光切割。
次之, 本发明提出了一种电池极片, 包括集流体, 该集流体于边缘处延伸出凸 起部, 该凸起部用于作为极耳。 或一种电池极片, 包括集流体, 该集流体于边 缘处延伸出凸起部, 该凸起部用于实现与其他电池极片的集流体的焊接连接。 [9] 再次, 本发明提出了一种电池, 包括极性引线和极片, 所述极片包括集流体, 所述集流体于边缘处延伸出凸起部; 所述凸起部与所述极性弓 I线相接。
有益效果
[10] 本发明的有益效果是: 釆用本发明极片加工方法, 在集流体上直接加工出凸起 部作为极耳, 极耳是集流体的一部分, 完全避免了传统的加工过程中可能出现 的焊接不良、 虚焊、 假焊、 保护胶带漏贴、 保护胶带上有气泡等工艺缺陷, 提 高了电池性能的稳定性与可靠性。
[11] 本发明的加工方法, 加工过程简化, 省去了现有技术中极耳的机械切割、 将极 耳焊接到集流体上、 极耳焊接到集流体上后贴保护胶布等工序, 完全避免了传 统的加工过程中可能出现的工艺缺陷; 提高生产效率, 节约成本。
[12] 同理, 本发明的电池, 将集流体上直接加工出凸起部作为极耳, 极耳是集流体 的一部分, 提高了电池的稳定性与可靠性。 由于省去了现有技术中极耳的加工 工序, 完全避免了传统的加工过程中可能出现的工艺缺陷, 使电池的整体性能 得到提高; 同吋生产效率提高, 节约成本。
[13] 本发明可以在现有卷绕生产线上的相应位置增加激光切割设备, 即可实施, 这 样可以使极片加工和电芯卷绕在同一条生产线上连续进行。
附图说明
[14] 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:
[15] 图 1是现有技术加工方法得到的极片的主视图;
[16] 图 2是图 1所示极片的俯视图;
[17] 图 3是釆用本发明实施例中极片加工过程中, 在激光切割之前极片的俯视图; [18] 图 4是图 3中的极片在激光切割之后的俯视图;
[19] 图 5是图 4所示极片的主视图。
本发明的实施方式
[20] 本实施方式中, 锂离子电池的基本结构与工作原理, 与现有技术基本相同, 包 括: 电池极片、 电解质、 隔膜、 正极引线、 负极引线、 中心端子、 安全阀、 密 封圏和电池壳等。 电池极片包括正极片和负极片, 正极片包括正极集流体和涂 覆在正极集流体上的正极活性物质, 负极片包括负极集流体和涂覆在负极集流 体上的负极活性物质。 本例中的锂离子电池与现有技术的主要不同之处在于, 本例中, 正极片、 负极片的结构没有另行连接极耳的结构, 而是由集流体于边 缘处加工出来的凸起部作为各极片相接和引出极性引线的连接接点, 实现现有 技术中极耳的功能。 多个正极片通过正极集流体上的凸起部相接并与正极引线 相接, 多个负极片通过负极集流体上的凸起部相接并与负极引线相接。
[21] 本例中, 对于集流体 (正极或负极) 于边缘处加工出来的凸起部, 不妨按传统 意义的称谓, 仍称之为极耳。 本例的对极耳的加工的具体过程包括:
[22] a.如图 3所示, 在集流体 10的下边缘确定一定宽度的极耳加工带 12, 极耳加工带 12的宽度为 d, 极耳加工带 12的上方区域即非极耳加工带则涂布有活性物质 11 ;
[23] b.按照需要的位置、 尺寸和形状, 用激光切割集流体 10的极耳加工带 12, 得到 与集流体 10—体的极耳 13, 参见图 4和图 5。
[24] 如图 3所示, 集流体 10为一个整体, 集流体 10上划分了两个区域: 靠近边缘位 置的条形区域为极耳加工带 12, 极耳加工带 12的上方非极耳加工带为涂布活性 物质 11的浆料涂布区。 釆用本例的方法, 不用另行制作极耳, 而是直接在集流 体 10上的极耳加工带 12加工出 6个极耳 13 (参见图 4) 。 对比图 3和图 4, 激光将 极耳加工带 12相应位置上的集流体箔材切除, 剩余部分即为加工得到的各极耳 1 3。 由于极耳 13与集流体 10是一体的, 即实际上, 极耳 13是集流体 10的边缘处延 伸出来的凸起部, 也可以表述为本例中的电池极片无须另外设置极耳, 直接可 通过焊接集流体上的凸起部, 实现电性连接。 激光加工与机械切割不同, 加工 出的极耳 13无毛边, 有助于提高卷芯质量; 由于直接在集流体 10上的极耳加工 带 12加工出极耳 13, 省去了现有技术中极耳的机械切割、 将极耳焊接到集流体 上、 极耳焊接到集流体上后贴保护胶布等工序, 避免了传统工序中可能出现的 工艺缺陷, 加工过程得到简化, 有利于提供生产效率, 节约成本。
[25] 上述极耳加工过程, 可以在现有卷绕生产线上的相应位置增加激光切割设备即 可实现, 可以使极耳加工和电芯卷绕在同一条生产线上连续进行。
[26] 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, 在具体实施本发明吋, 极耳 13的数 量和位置可根据需要进行设置; 切割可以在浆料涂布区涂布活性物质 11之前进 行, 也可以在浆料涂布区涂布活性物质 11之后进行。

Claims

权利要求书
[I] 一种电池极片加工方法, 包括步骤: 11) 在集流体的边缘处预留一定宽度 的极耳加工带; 12) 按照需要的位置、 尺寸和形状, 切割集流体的极耳加 工带, 得到与集流体一体的极耳。
[2] 如权利要求 1所述的电池极片加工方法, 其特征在于: 在所述步骤 11) 之前
、 所述步骤 12) 之后, 还包括以下步骤: 在集流体上的非极耳加工带涂布 活性物质;
[3] 如权利要求 1所述的电池极片加工方法, 其特征在于: 在所述步骤 12) 之后
, 还包括以下步骤: 在集流体上的非极耳加工带涂布活性物质。
[4] 如权利要求 1所述的电池极片加工方法, 其特征在于: 在所述步骤 12) 中, 釆用激光切割。
[5] 如权利要求 2所述的电池极片加工方法, 其特征在于: 在所述步骤 12) 中, 釆用激光切割。
[6] 如权利要求 3所述的电池极片加工方法, 其特征在于: 在所述步骤 12) 中, 釆用激光切割。
[7] 一种电池极片, 包括集流体, 该集流体于边缘处延伸出凸起部, 该凸起部 用于作为极耳。
[8] 一种电池极片, 包括集流体, 该集流体于边缘处延伸出凸起部, 该凸起部 用于实现与其他电池极片的集流体的焊接连接。
[9] 一种电池, 包括极性引线和极片, 所述极片包括集流体, 所述集流体于边 缘处延伸出凸起部; 所述凸起部与所述极性弓 I线相接。
[10] 如权利要求 9所述的电池, 其特征是: 所述极性引线为负极引线, 所述极片 为负极片。
[I I] 如权利要求 9所述的电池, 其特征是: 所述极性引线为正极引线, 所述极片 为正极片。
PCT/CN2009/072833 2009-03-31 2009-07-20 电池极片加工方法、电池极片及电池 WO2010111852A1 (zh)

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