CN104218208B - 一种全极耳集流盘 - Google Patents

一种全极耳集流盘 Download PDF

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CN104218208B
CN104218208B CN201410371930.8A CN201410371930A CN104218208B CN 104218208 B CN104218208 B CN 104218208B CN 201410371930 A CN201410371930 A CN 201410371930A CN 104218208 B CN104218208 B CN 104218208B
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CN104218208A (zh
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刘艺
靳承铀
薛驰
赵映军
缪永华
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Jiangsu Zhongtian Technology Co Ltd
Zhongtian Energy Storage Technology Co Ltd
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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
    • 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
    • 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
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    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Electrochemistry (AREA)
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Abstract

本发明公开了一种全极耳集流盘与焊接设计，解决了动力电池全极耳大倍率放电极耳引出电流不均匀，极耳处散热慢，极化析晶的问题。全极耳集流盘由两部分组成，绝缘层与导电层，绝缘层上有与电芯卷绕同纹路的狭缝，狭缝之间均匀分布有供电解液进入的细小的长方形小口，绝缘层狭缝上边缘镀1.5mm宽的导电铜线；焊接时，把卷绕好的电芯留白穿过集流盘狭缝，高出1.5mm，然后折边，覆盖在导电铜带上，采用连续激光焊接技术焊接，如此，实现全极耳全部焊接，电流密度均匀，电阻低，散热快，电池一致性高。

Description

一种全极耳集流盘
技术领域
本发明涉及锂离子电池设计领域，特别是一种全极耳集流盘及焊接工艺。
背景技术
随着动力电车对电流输出与功率输出性能要求的进一步提高，对提供动力的单体电池提出了更高的要求：高功率，高倍率。传统的电池在高倍率（大于3C）放电时，发热严重，容易造成电池鼓胀，电池循环性能差，一致性差，原因在于采用单极耳引出，电流分布不均，电流传输路径长，电阻大，效率低，散热慢，同时容易在极耳处产生极化与金属枝晶，造成电池短路，引发事故。
为了实现大电流输出，同时电阻低，电流密度均匀，散热良好，发展了多极耳与全极耳，虽然得到改善，但是电阻还是比较高，稳定性差，探究原因出在极耳焊接上，焊接时采用点焊，容易虚焊，而且全极耳中各焊点存在内部应力，焊接时易造成其他焊点断开，导致电阻稳定性差，电池一致性差。
为了改善全极耳这种焊接缺陷，有人采用了端面焊接，即制作极片时留白，卷绕后抿平留白，焊接在集流盘上，虽然电阻小了，但是存在问题：抿平虽然可以得到面接触，但焊接时肯定会存在缝隙，即极耳存在堆叠，有的极耳没焊接上，就好比把长方形卷成空心圆筒状，然后把一小段抿平成圆柱端面，然后封住端面，其中肯定存在缝隙，这就达不到完全面接触焊接。
发明内容
为了克服上述现有技术的不足，解决上述技术问题本发明提供了一种全极耳集流盘，包括绝缘层与导电层，绝缘层在下，导电层在上，叠加构成全极耳集流盘，绝缘层上有与电芯卷绕同纹路的狭缝。
进一步的，绝缘层狭缝之间均匀分布有供电解液进入的细小的长方形小口
进一步的，所述绝缘层狭缝上边缘镀宽度为0.2-0.3mm，厚度为0.2-0.5mm的导电铜线。
与现有技术相比，本发明的有益效果是：
（1）电流密度均匀，电阻小，散热快，电阻稳定，可以提高电池一致性；
（2）提高电芯位置的稳定性，防止电解液漏液。
附图说明
图1为本发明的结构示意图；
图2为本发明的侧视图；
图3为极片结构示意图。
具体实施方式
下面结合附图对本发明进一步说明。
如图1-3所示，全极耳集流盘包括导电层1与绝缘层2，绝缘层在下2，导电层1在上，叠加构成全极耳集流盘；
导电层1为常规结构的圆盘形铜带。导电层1覆在绝缘层2上表面。
绝缘层2刻有与极片6卷绕相同的狭缝3，狭缝呈喇叭状，供极片6留白5引出，在狭缝3之间有供电解液进入的通口4，呈长方形；上部分为导电层1，采用金属镀膜的方法在狭缝3小口边沿镀1.5mm宽的铜膜。
用本发明的集流盘与电芯常规组合形成锂电池电化学储能转换装置。电芯极片6上的留白5穿过狭缝3引出，高出导电层1.5mm，高出部分经折边后经连续激光焊接到狭缝3小口边沿的铜膜上，实现全极耳全部焊接，电流密度均匀，电阻低，散热快，电池一致性高。

Claims (2)

1.一种全极耳集流盘，包括绝缘层与导电层，所述绝缘层在下，导电层在上，叠加构成圆盘形薄圆柱片状全极耳集流盘，其特征在于：所述绝缘层上有设与电芯卷绕同纹路的螺纹状狭缝，所述狭缝与绝缘层以狭缝壁隔离，狭缝穿透绝缘层。
2.根据权利要求1所述的全极耳集流盘，其特征在于：所述绝缘层狭缝两两之间分布有供电解液进入的细小的长方形小口，所述长方形小口穿透绝缘层。
CN201410371930.8A 2014-07-31 2014-07-31 一种全极耳集流盘 Active CN104218208B (zh)

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CN106410104B (zh) * 2016-08-25 2023-03-24 合肥国轩高科动力能源有限公司 一种圆柱形多极耳电池及其制造方法
CN112038090A (zh) * 2020-09-08 2020-12-04 宁国市奇博电器有限公司 喷金面不易脱落的金属化薄膜及其制备方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2665940Y (zh) * 2003-11-11 2004-12-22 深圳佳士德电池有限公司 可有效汇集电流的碱性二次电池
JP2007265846A (ja) * 2006-03-29 2007-10-11 Sanyo Electric Co Ltd 円筒形電池およびその製造方法
CN201046465Y (zh) * 2007-05-10 2008-04-16 西峡龙成特种材料有限公司 内冷式热轧输送辊
CN103730624A (zh) * 2013-12-19 2014-04-16 周培荣 锂电端面焊集流体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2665940Y (zh) * 2003-11-11 2004-12-22 深圳佳士德电池有限公司 可有效汇集电流的碱性二次电池
JP2007265846A (ja) * 2006-03-29 2007-10-11 Sanyo Electric Co Ltd 円筒形電池およびその製造方法
CN201046465Y (zh) * 2007-05-10 2008-04-16 西峡龙成特种材料有限公司 内冷式热轧输送辊
CN103730624A (zh) * 2013-12-19 2014-04-16 周培荣 锂电端面焊集流体

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