WO2019001299A1 - 带安全机构的电池串联片和配置该串联片的电池 - Google Patents

带安全机构的电池串联片和配置该串联片的电池 Download PDF

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Publication number
WO2019001299A1
WO2019001299A1 PCT/CN2018/091763 CN2018091763W WO2019001299A1 WO 2019001299 A1 WO2019001299 A1 WO 2019001299A1 CN 2018091763 W CN2018091763 W CN 2018091763W WO 2019001299 A1 WO2019001299 A1 WO 2019001299A1
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Prior art keywords
battery
ptc element
electrode sheet
safety mechanism
hole
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English (en)
French (fr)
Inventor
许玉林
龚晓冬
王爱淑
娄豫皖
顾江娜
张旭
许祎凡
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Suzhou Ankao Energy Co Ltd
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Suzhou Ankao Energy 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
    • 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
    • H01M10/058—Construction or manufacture
    • 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 battery technology, and more particularly to a battery tandem sheet with a safety mechanism and a battery configured with the tandem sheet.
  • Lithium-ion batteries are the most energy-efficient, long-life battery series in the world. What is more valuable is that it does not use toxic and harmful materials, is environmentally friendly, and has been used more and more widely. But it also has fundamental flaws, poor safety, and the danger of fire and explosion. Various research units and production plants have done a lot of work to improve their safety. The anode-free welding process of Suzhou Anyuan Power Supply Co., Ltd. is a successful example.
  • the core of the negative electrode no-welding process is to replace the common thin metal connecting piece with a metal piece (battery series piece) with a plurality of claws, and a plurality of claws of the metal piece are hung on the battery case to realize contact electrical connection.
  • the battery tandem sheet of the above structure has a strong overcurrent capability and a low electrical resistance. However, it does not block too much current and cannot withstand the damage of the battery caused by large current.
  • the purpose of the present application is: for the above technical problem, the present application proposes a battery tandem piece with a safety mechanism, and also proposes a battery for arranging such a series piece.
  • a battery serial piece with a safety mechanism comprising:
  • the PTC element includes an upper electrode sheet on an upper surface of the PTC element, a lower electrode sheet on a lower surface of the PTC element, and a thermistor layer connecting the upper electrode sheet and the lower electrode sheet;
  • the upper surface of the PTC element is provided with a blind hole extending downward to the upper surface of the lower electrode sheet, and the through film is provided with a through hole directly communicating with the blind hole, and the lower surface of the negative film is The upper surface of the electrode sheet is placed in close contact with each other and fixed by welding.
  • the application further includes the following preferred solutions:
  • the outer contour of the PTC element is circular.
  • blind hole Only one of the blind holes is provided, and the blind hole is disposed at a central position of the PTC element.
  • Only one of the through holes is provided, and the through hole is disposed at a center position of the film.
  • the blind holes are provided with at least two, and the blind holes are symmetrically distributed with a geometric center point of the PTC element as a center of symmetry.
  • a total of four blind holes are provided.
  • the through holes are provided in total, and the four through holes are arranged in one-to-one correspondence with the four blind holes.
  • the blind hole is a circular hole or a square hole.
  • a battery comprising a positive electrode terminal and a negative electrode terminal disposed at opposite ends of the battery, characterized by further comprising a battery series piece of the above structure, wherein the lower electrode piece is closely arranged with the positive electrode end or the negative electrode end and Solder fixed.
  • the battery is a cylindrical lithium ion battery, and the lower electrode sheet is placed in close contact with the positive electrode end and fixed by welding.
  • This application solders a PTC component on a battery tandem chip, and the battery serial sheet body structure and the PTC component are provided with a very clever through hole and blind hole structure, so that the PTC component can be welded to the battery very smoothly.
  • the PTC component is soldered on the battery tandem chip.
  • a large current passes through the battery, which may cause a risk of thermal runaway and fire.
  • PTC components block high currents to protect the battery. After the external short circuit and other faults are eliminated, the PTC component can automatically resume normal operation.
  • FIG. 1 is a schematic cross-sectional structural view of a battery tandem piece with a safety mechanism according to Embodiment 1 of the present application;
  • FIG. 2 is a schematic perspective structural view of a battery tandem piece with a safety mechanism according to Embodiment 1 of the present application;
  • FIG. 3 is a schematic perspective structural view of a PTC component according to Embodiment 1 of the present application.
  • FIG. 4 is a schematic perspective structural view of a battery tandem piece with a safety mechanism according to Embodiment 2 of the present application;
  • FIG. 5 is a schematic perspective structural view of a battery tandem piece with a safety mechanism according to Embodiment 3 of the present application;
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 1 and 2 illustrate a specific embodiment of a battery tandem sheet with a safety mechanism of the present application, comprising: a circular backsheet 1, a plurality of claws integrally formed around the backsheet and located on the upper side of the backsheet 2.
  • a PTC element 3 provided on the lower side of the film.
  • the backsheet 1 and the pawl 2 are typically of steel.
  • the PTC element 3 includes an upper electrode sheet 301 on the upper surface of the PTC element, a lower electrode sheet 302 on the lower surface of the PTC element, and a thermistor layer 303 (usually a thermopolymer) connecting the upper electrode sheet and the lower electrode sheet. ). In practical applications, current must pass through the thermistor layer 303 to flow from the lower electrode sheet 302 to the upper electrode sheet 301.
  • a key improvement of the embodiment is that the upper surface of the PTC element 3 is provided with a blind hole 3a extending downward to the upper surface of the lower electrode piece 3b, and the through hole 1a of the negative electrode 3a is directly penetrated through the negative electrode 1a.
  • the lower surface of the backsheet 1 is placed in close contact with the upper surface of the upper electrode sheet 301 and is fixed by welding.
  • the blind hole 3a and the through hole 1a are respectively disposed on the PTC element 3 and the negative film 1 for the purpose of facilitating the solder connection of the series piece to the battery.
  • the battery tandem sheet is arranged on the positive end (or the negative end, usually the positive end, the negative electrode is solderless) of the battery (usually a lithium ion battery with a cylindrical structure), and the PTC element 3 upper and lower electrode sheets 302 are provided.
  • the lower surface is closely arranged with the positive end of the battery, and the welding laser beam emitted from the laser welding machine passes through the through hole 1a and the blind hole 3a to illuminate the joint between the lower surface of the lower electrode piece 302 and the positive electrode end of the battery, thereby making the lower electrode
  • the lower surface of the sheet 302 is soldered to the positive end of the battery.
  • the negative end of the other battery is interposed between the respective claws 2 and is in contact with the claws 2.
  • the current passing through the negative film 1 and the claw 2 must pass through the circular PTC element to reach the other battery. If the current exceeds the critical current of the PTC element, the PTC element operates to block the current and protect the safety of the battery. After the large current is removed, the PTC component returns to conduction and the battery can resume normal operation.
  • the outer contour of the PTC element 3 is circular, and only one blind hole 3a is provided on the PTC element 3, and the blind hole 3a is disposed at the center position of the PTC element 3.
  • the blind hole 3a is a circular hole, and correspondingly, the through hole on the backsheet 2 is also a circular hole.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 4 shows a second embodiment of the battery tandem piece with safety mechanism of the present application, the structure of which is basically the same as that of the battery series piece in the first embodiment, the only difference being that the blind hole on the PTC element 3
  • the through holes on 3a and the backsheet 2 are square holes.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • FIG. 5 shows a third embodiment of the battery tandem piece with safety mechanism of the present application, the structure of which is basically the same as that of the battery series piece in the first embodiment, the only difference being that the blind hole on the PTC element 3 A total of four are provided in 3a, and the four blind holes 3a are symmetrically distributed with the geometric center point of the PTC element 3 as a center of symmetry.
  • a total of four through holes 1a are formed in the backsheet 1, and the four through holes 1a are provided in one-to-one correspondence with the four blind holes 3a.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了一种带安全机构的电池串联片，包括：底片，一体形成于所述底片四周、且位于所述底片上侧的若干个弹爪，设于在所述底片下侧的PTC元件；所述PTC元件包括位于该PTC元件上表面的上电极片、位于该PTC元件下表面的下电极片、连接所述上电极片和下电极片的热敏电阻层；所述PTC元件的上表面开设有向下延伸至所述下电极片上表面处的盲孔，所述底片上贯通开设有与所述盲孔直接连通的通孔，所述底片的下表面与所述上电极片的上表面紧贴布置且焊接固定。本申请在电池串联片上焊接PTC元件，而且电池串联片本体结构和PTC元件上设置了十分巧妙的通孔和盲孔结构，使得PTC元件能够十分顺利地与电池焊接。

Description

带安全机构的电池串联片和配置该串联片的电池 技术领域
本申请涉及电池技术领域，尤其是一种带安全机构的电池串联片和配置该串联片的电池。
背景技术
锂离子电池是当今世界上比能量最高，适用的条件宽广而使用寿命最长的电池系列。更可贵的是它不使用有毒有害的材料，对环境友善，得到了越来越广泛的应用。但是它也有根本的缺陷，安全性不好，有起火爆炸的危险。各研究单位和生产厂都做了大量工作改善其安全性。苏州安靠电源公司的负极免焊接工艺就是比较成功的一例。
负极免焊接工艺的核心是用带有多个弹爪的金属片(电池串联片)代替通用的薄金属连接片，金属片的多个弹爪抱住电池壳，实现接触电连接。从而取消了对电池壳底的焊接，消除了焊接热对靠近底的内部核心构件的伤害，提高了安全性。
然而，上述结构的电池串联片过流能力很强，电阻低。但是对太大的电流没有阻挡，不能抵御大电流对电池的伤害。
发明内容
本申请目的是：针对上述技术问题，本申请提出一种带安全机构的电池串联片，同时还提出一种配置这种串联片的电池。
本申请的技术方案是：一种带安全机构的电池串联片，包括：
底片，
一体形成于所述底片四周、且位于所述底片上侧的若干个弹爪，以及
设于在所述底片下侧的PTC元件；
所述PTC元件包括位于该PTC元件上表面的上电极片、位于该PTC元件下表面的下电极片、连接所述上电极片和下电极片的热敏电阻层；
所述PTC元件的上表面开设有向下延伸至所述下电极片上表面处的盲孔，所述底片上贯通开设有与所述盲孔直接连通的通孔，所述底片的下表面与所述上电极片的上表面紧贴布置且焊接固定。
本申请在上述技术方案的基础上，还包括以下优选方案：
所述PTC元件的外轮廓为圆形。
所述盲孔仅设置有一个，且该盲孔设置在所述PTC元件中心位置。
所述通孔仅设置有一个，且该通孔设置在所述底片中心位置。
所述盲孔设置有至少两个，并且这些盲孔以所述PTC元件的几何中心点为对称中心对称分布。
所述盲孔共设置四个。
所述通孔共设置有四个，且这四个通孔与四个所述盲孔一一对应设置。
所述盲孔为圆孔或方孔。
一种电池，包括设于该电池两相对端的正极端和负极端，其特征在于，还包括上述结构的电池串联片，所述下电极片与所述正极端或所述负极端紧贴布置且焊接固定。
该电池为圆柱形锂离子电池，所述下电极片与所述正极端紧贴布置且焊接固定。
本申请的优点是：
1、本申请在电池串联片上焊接PTC元件，而且电池串联片本体结构和PTC元件上设置了十分巧妙的通孔和盲孔结构，使得PTC元件能够十分顺利地与电池焊接。
2、本申请在电池串联片上焊接PTC元件，在发生外短路状态下，大电流通过电池，有引起热失控起火爆炸的危险。PTC元件可阻断大电流保护了电池的安全。外短路等故障消除后，PTC元件又能够自动恢复正常工作状态。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例一中带安全机构的电池串联片的剖面结构示意图；
图2为本申请实施例一中带安全机构的电池串联片的立体结构示意图；
图3为本申请实施例一中PTC元件的立体结构示意图；
图4为本申请实施例二中带安全机构的电池串联片的立体结构示意图；
图5为本申请实施例三中带安全机构的电池串联片的立体结构示意图；
其中：1-底片，1a-通孔，2-弹爪，3-PTC元件，301-上电极，302-下电极，303-热敏电阻层，3a-盲孔。
具体实施方式
以下结合具体实施例对上述方案做进一步说明。应理解，这些实施例是用于说明本申请而不限于限制本申请的范围。实施例中采用的实施条件可以根据具体厂家的条件做进一步调整，未注明的实施条件通常为常规实验中的条件。
实施例一：
图1和图2示出了本申请这种带安全机构的电池串联片的一个具体实施例，其包括：圆形的底片1，一体形成于底片四周、且位于底片上侧的多个弹爪2，设于底片下侧的PTC元件3。底片1和弹爪2通常为钢质。
PTC元件3包括位于该PTC元件上表面的上电极片301、位于该PTC元件下表面的下电极片302、连接所述上电极片和下电极片的热敏电阻层303(通常为热聚合物质)。实际应用时，电流必须经过热敏电阻层303才能由下电极片302流向上电极片301。
本实施例的关键改进在于：PTC元件3的上表面开设有向下延伸至下电极 片3b上表面处的盲孔3a，底片1上贯通开设有与所述盲孔3a直接连通的通孔1a，底片1的下表面与上电极片301的上表面紧贴布置且焊接固定。
之所以在PTC元件3和底片1上分别设置上述的盲孔3a和通孔1a，是为了方便该串联片与电池的焊接连接。实际应用时，将该电池串联片布置在电池(通常为圆柱形结构的锂离子电池)的正极端(或负极端，通常为正极端，负极免焊)，并使PTC元件3上下电极片302的下表面与电池的正极端紧贴布置，激光焊机发出的焊接激光束穿过上述通孔1a和盲孔3a而照射在下电极片302下表面和电池正极端的接合处，从而使下电极片302下表面和电池正极端焊接固定在一起。另一根电池的负极端插设在各弹爪2之间并与弹爪2接触连接。如此，通过底片1和弹爪2的电流必须经过圆形PTC元件才能到达另一个电池，如果电流超过PTC元件的临界电流，PTC元件动作，阻断电流，保护了电池的安全。大电流消除后，PTC元件恢复导通，电池又可回复正常工作。
如图3所示，本实施例中，PTC元件3的外轮廓为圆形，该PTC元件3上的盲孔3a仅设置有一个，且该盲孔3a设置在PTC元件3中心位置。该盲孔3a为圆孔，对应地，底片2上的通孔也为圆孔。
实施例二：
图4示出了本申请这种带安全机构的电池串联片的第二个具体实施例，其结构与实施例一中电池串联片的结构基本一致，唯一不同在于，PTC元件3上的盲孔3a以及底片2上的通孔均为方孔。
实施例三：
图5示出了本申请这种带安全机构的电池串联片的第三个具体实施例，其结构与实施例一中电池串联片的结构基本一致，唯一不同在于，PTC元件3上的盲孔3a共设置有四个，并且这四个盲孔3a以PTC元件3的几何中心点为对称中心对称分布。对应地，底片1上通孔1a也共设置有四个，且这四个通孔1a与四个盲孔3a一一对应设置。
上述实施例只为说明本申请的技术构思及特点，其目的在于让人们能够了解本申请的内容并据以实施，并不能以此限制本申请的保护范围。凡根据本申请主要技术方案的精神实质所做的等效变换或修饰，都应涵盖在本申请的保护范围之内。

Claims (10)

  1. 一种带安全机构的电池串联片，包括：
    底片(1)，
    一体形成于所述底片四周、且位于所述底片上侧的若干个弹爪(2)，以及
    设于在所述底片下侧的PTC元件(3)；
    所述PTC元件(3)包括位于该PTC元件上表面的上电极片(301)、位于该PTC元件下表面的下电极片(302)、连接所述上电极片和下电极片的热敏电阻层(303)；
    其特征在于，所述PTC元件(3)的上表面开设有向下延伸至所述下电极片(3b)上表面处的盲孔(3a)，所述底片(1)上贯通开设有与所述盲孔(3a)直接连通的通孔(1a)，所述底片(1)的下表面与所述上电极片(301)的上表面紧贴布置且焊接固定。
  2. 根据权利要求1所述的带安全机构的电池串联片，其特征在于，所述PTC元件(3)的外轮廓为圆形。
  3. 根据权利要求1所述的带安全机构的电池串联片，其特征在于，所述盲孔(3a)仅设置有一个，且该盲孔(3a)设置在所述PTC元件(3)中心位置。
  4. 根据权利要求3所述的带安全机构的电池串联片，其特征在于，所述通孔(1a)仅设置有一个，且该通孔(1a)设置在所述底片(1)中心位置。
  5. 根据权利要求1所述的带安全机构的电池串联片，其特征在于，所述盲孔(3a)设置有至少两个，并且这些盲孔(3a)以所述PTC元件(3)的几何中心点为对称中心对称分布。
  6. 根据权利要求5所述的带安全机构的电池串联片，其特征在于，所述盲孔(3a)共设置四个。
  7. 根据权利要求6所述的带安全机构的电池串联片，其特征在于，所述通孔(1a)共设置有四个，且这四个通孔(1a)与四个所述盲孔(3a)一一对应设置。
  8. 根据权利要求1至7中任一所述的带安全机构的电池串联片，其特征在于，所述盲孔(3a)为圆孔或方孔。
  9. 一种电池，包括设于该电池两相对端的正极端和负极端，其特征在于，还包括如权利要求1-8中任一所述的电池串联片，所述下电极片(302)与所述正极端或所述负极端紧贴布置且焊接固定。
  10. 根据权利要求9所述的电池，其特征在于，该电池为圆柱形锂离子电池，所述下电极片(302)与所述正极端紧贴布置且焊接固定。
PCT/CN2018/091763 2017-06-30 2018-06-19 带安全机构的电池串联片和配置该串联片的电池 Ceased WO2019001299A1 (zh)

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CN107256940A (zh) * 2017-06-30 2017-10-17 苏州安靠电源有限公司 带安全机构的电池串联片和配置该串联片的电池

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CN107256940A (zh) * 2017-06-30 2017-10-17 苏州安靠电源有限公司 带安全机构的电池串联片和配置该串联片的电池
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CN107256940A (zh) * 2017-06-30 2017-10-17 苏州安靠电源有限公司 带安全机构的电池串联片和配置该串联片的电池
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