WO2019033767A1 - 爆破片 - Google Patents

爆破片 Download PDF

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Publication number
WO2019033767A1
WO2019033767A1 PCT/CN2018/081953 CN2018081953W WO2019033767A1 WO 2019033767 A1 WO2019033767 A1 WO 2019033767A1 CN 2018081953 W CN2018081953 W CN 2018081953W WO 2019033767 A1 WO2019033767 A1 WO 2019033767A1
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WO
WIPO (PCT)
Prior art keywords
groove
rupture disc
groove ring
ring
lithium battery
Prior art date
Application number
PCT/CN2018/081953
Other languages
English (en)
French (fr)
Inventor
王有生
丁朝阳
丁坤
Original Assignee
深圳市瑞德丰精密制造有限公司
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 深圳市瑞德丰精密制造有限公司 filed Critical 深圳市瑞德丰精密制造有限公司
Priority to EP18845887.1A priority Critical patent/EP3671897A4/en
Priority to US16/619,354 priority patent/US20200388806A1/en
Priority to JP2019600178U priority patent/JP3227978U/ja
Publication of WO2019033767A1 publication Critical patent/WO2019033767A1/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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/383—Flame arresting or ignition-preventing means
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • 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 utility model relates to the technical field of battery explosion-proof, in particular to a rupture disc of a battery.
  • Lithium batteries are Its high capacity and other excellent characteristics are widely used in electronic products.
  • the lithium battery comprises a casing, a cover plate, a battery core and the like, wherein the electric core is disposed inside the casing, the upper end of the casing has an upper end opening, the cover plate is closed at an opening of the upper end of the casing, and the cover plate is provided with a port.
  • the lithium battery supplies power to the outside through the port.
  • the battery is used as a storage component of a lithium battery.
  • an abnormal gas may be generated inside the casing due to factors such as a charger and a chemical reaction inside the lithium battery, resulting in an excessive pressure inside the casing of the lithium battery. If the internal pressure of the casing continues to increase, the internal pressure of the lithium battery will be too large, causing a lithium battery explosion accident, which may damage the electronic product and injure the user.
  • a rupture disc In order to prevent the explosion of the lithium battery, a rupture disc is generally disposed on the cover of the lithium battery. When the internal pressure of the lithium battery exceeds a certain value, the rupture disc will rupture, causing abnormal gas inside the lithium battery to leak, reducing the inside of the lithium battery. The pressure prevents the lithium battery from exploding due to excessive internal pressure, making the use of the lithium battery safer.
  • the rupture disc provided by the utility model aims to solve the problem that the rupture disc is easily deformed in the prior art, so that the internal volume of the battery increases, and the blasting time of the rupture disc is delayed, so that the blasting mechanism of the lithium battery cannot react in time, resulting in battery generation. The danger of explosion.
  • the utility model is realized by the invention, comprising an integrally formed sheet body, the sheet body is formed with a closed annular groove ring, and the sheet body is formed with a turning body in the surrounding area of the groove ring;
  • a notch-shaped indentation is provided in the groove ring, the notch encircling in a circumferential direction of the groove ring, and the groove ring is located at a portion between the two ends of the indentation to form a supply The connecting section when the flipping body is turned over.
  • the sheet body is formed with one groove ring, and only one of the turning bodies is formed in the surrounding area of the groove ring.
  • the groove ring has a rectangular shape with a length segment and a width segment, and the connecting segment is located at a length of the groove ring.
  • two groove rings are formed on the sheet body, and the two groove rings are arranged side by side, and only one of the turning bodies is formed in the surrounding area of each of the groove rings.
  • adjacent portions of the two groove rings overlap each other to form an overlapping segment.
  • two of the connecting segments of the two groove rings are respectively located on the groove rings facing the overlapping segments.
  • the sheet body includes a closed annular connecting ring formed on an outer circumference of the groove ring.
  • the thickness of the turning body is not less than the thickness of the connecting ring.
  • the score is formed in the middle of the groove ring.
  • the rupture disc provided by the utility model is provided with a groove ring on the sheet body, and a non-closed annular nick is provided in the groove, and the groove ring is located at both ends of the nick.
  • the intermediate portion forms a connecting portion, and a turning body is formed in the groove ring, so that the rigidity of the rupture disc can be increased, and when the pressure received does not reach the critical point, the rigid rupture disc is not easily deformed, and the pair is prevented from being deformed.
  • the pressure change inside the lithium battery has an influence.
  • the rupture disc blasts at the nick, so that the flipping body is turned around the connecting section, and the original position of the flipping body forms a hole, and the inside of the lithium battery
  • the abnormal gas leaks out through the hole in time to avoid the danger of explosion of the lithium battery, solves the problem that the large-sized rupture disc is easily deformed, the internal volume of the battery increases, and the blasting time of the rupture disc is delayed, so that the blasting mechanism of the lithium battery cannot be made in time. A reaction that causes the battery to explode.
  • FIG. 1 is a top plan view showing a blasting unit disposed on a sheet body of a rupture disc according to an embodiment of the present invention
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1;
  • FIG. 3 is a top plan view showing the arrangement of two blasting units on the sheet of the rupture disc provided by the embodiment of the present invention.
  • the rupture disc provided by the utility model is suitable for solving the problem that the rupture disc on the lithium battery is difficult to achieve directional blasting, and the rupture disc after the rupture will generate more debris, and can also be used in other types of batteries, and is not limited to the embodiment.
  • the rupture disc includes an integrally formed sheet body, and a closed annular groove ring 11 is formed on the sheet body.
  • the width of the groove ring 11 is equal.
  • the inverting body 12 is formed in the body surrounded by the groove ring 11; the groove ring 11 is provided with a non-closed annular indentation 13 which is surrounded in the circumferential direction of the groove ring 11, the groove ring 11
  • the portion between the two ends of the score 13 forms a connecting section 14 for the flipping body 12 to be inverted.
  • a non-closed annular score 13 is provided in the groove, and a portion of the groove ring 11 between the two ends of the score 13 forms a connecting portion 14, in the groove
  • the turning body 12 is formed in the ring 11, so that the rigidity of the rupture disc can be increased.
  • the pressure received does not reach the critical point, the rigid rupture disc is not easily deformed, thereby avoiding the influence of pressure changes inside the lithium battery.
  • the rupture disc is blasted at the score 13 so that the flipping body 12 is turned around the connecting section 14, and at this time, the original position of the flipping body 12 forms a hole, and the abnormal gas inside the lithium battery passes through the hole. Discharge in time to avoid the danger of explosion of lithium battery, solve the problem that the rupture disc is prone to deformation and the rupture disc with high rigidity cannot be blasted in time, resulting in the danger of explosion of the lithium battery.
  • a groove ring 11 is formed on the sheet body, and only one inverting body 12 is formed in the surrounding area of the groove ring 11.
  • the notch 13 in the groove ring 11 is cracked, so that the abnormal gas inside the lithium battery is leaked through the hole formed after the turning body 12 is turned over, so that the use of the lithium battery is safer.
  • the size of the groove ring 11 can be set according to actual needs.
  • the groove ring 11 has a rectangular shape with a length section and a width section, and the connecting section 14 is located at a length of the groove ring 11.
  • two groove rings 11 are formed on the sheet body, and two groove rings 11 are arranged side by side, and only one inverting body 12 is formed in the surrounding area of each groove ring 11.
  • the groove ring 11 can be made smaller, and the turning body 12 disposed in the groove ring 11 can also be set smaller to facilitate the use of the rupture disk.
  • the groove ring 11 can be set to three or more according to actual needs.
  • the adjacent portions of the two groove rings 11 overlap each other to form an overlapping segment.
  • the two holes formed are connected to each other to form a large hole, so that the abnormal gas inside the lithium battery can be discharged more quickly.
  • the two connecting sections 14 of the two groove rings 11 are respectively located on the groove rings 11 facing the overlapping sections.
  • the sheet body includes a closed annular connecting ring 15 formed on the outer circumference of the groove ring 11.
  • the inner side of the connecting ring 15 is connected with the groove ring 11, and the outer layer is connected with the top cover plate, so that the flipping piece can be seamlessly connected with the top cover plate, and the use of the flipping piece is facilitated.
  • the thickness of the inverting body 12 is not less than the thickness of the connecting ring 15. In this way, the rigidity and strength of the blasting are further increased, and the rupture disc is prevented from being deformed. At the same time, the rupture disc can be prevented from being damaged during the blasting process, and the blasting debris is generated, which increases the difficulty of subsequent cleaning and replacement.
  • the score 13 is formed in the middle of the groove ring 11.
  • the score 13 located in the middle of the groove ring 11 can be cracked in time, so that the turning body 12 can be turned over in time, and the pressure inside the lithium battery can be leaked in time.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Gas Exhaust Devices For Batteries (AREA)
  • Secondary Cells (AREA)

Abstract

本实用新型涉及电池防爆的技术领域，公开了电池的爆破片，包括片体，片体上形成有封闭环形的凹槽环，片体形成有处于凹槽环包围区域内的翻转体；凹槽环内设置有非封闭环形的刻痕，刻痕沿凹槽环的环绕方向环绕，凹槽环位于刻痕的两个端部之间的部分形成供翻转体翻转时的连接段。通过在片体上设置凹槽环，在凹槽内设置有非封闭环形的刻痕，这样可以将爆破片的刚性增大，当受到的压力未到达临界点时，爆破片不易发生形变，避免对锂电池内部的压力变化产生影响，当压力达到预先设置的临界点时，爆破片于刻痕处爆破，使得翻转体绕着连接段翻转，此时翻转体原来的位置形成孔洞，锂电池内部的异常气体通过孔洞及时泄出，避免锂电池发生爆炸的危险。

Description

爆破片 技术领域
本实用新型涉及电池防爆的技术领域，尤其是电池的爆破片。
 背景技术
目前，随着电子产品的日益小型化、轻便化及便携带化，如摄像机、笔记本以及手机等，这些电子产品的驱动电源也向着高容量、高安全性以及轻便化的方向发展，锂电池以其高容量等优良特性，广泛地运用在电子产品中。
锂电池包括壳体、盖板以及电芯等，其中电芯置于壳体的内部，壳体的上端具有上端开口，盖板则封闭在壳体的上端的开口，盖板上设置有端口，锂电池通过端口实现对外部的供电。
电芯作为锂电池的储电元件，锂电池在使用时，会因为充电器等因素，以及随着锂电池内部化学反应，壳体内部会产生异常气体，导致锂电池的壳体内部压力过大，如果壳体的内部压力持续增大，则会导致锂电池的内部压力过大，从而发生锂电池爆炸事故，轻则损坏电子产品，重则伤及用户。
为了防止锂电池爆炸，一般会在锂电池的盖板上设置爆破片，当锂电池的内部压力超过一定值时，爆破片会破裂，使得锂电池内部的异常气体泄出，降低锂电池内部的压力，避免锂电池因内部压力过大而发生爆炸的情况出现，使得锂电池的使用更加安全。
当受到电池内部所施加的未达到临界点的压力的时候，爆破片自身容易发生形变，使得电池内部容积增加，延迟了爆破片的爆破时间，使得锂电池的爆破机制不能及时做出反应，导致电池发生爆炸的危险。
 技术问题
本实用新型提供的爆破片，旨在解决现有技术中，爆破片容易发生形变，使得电池内部容积增加，延迟爆破片的爆破时间，使得锂电池的爆破机制不能及时做出反应，导致电池发生爆炸的危险的问题。
 技术解决方案
本实用新型是这样实现的，包括一体成型的片体，所述片体上形成有封闭环形的凹槽环，所述片体形成有处于所述凹槽环包围区域内的翻转体；所述凹槽环内设置有非封闭环形的刻痕，所述刻痕沿所述凹槽环的环绕方向环绕，所述凹槽环位于所述刻痕的两个端部之间的部分形成供所述翻转体翻转时的连接段。
进一步地，所述片体上形成有一个所述凹槽环，所述凹槽环的包围区域内仅形成有一个所述翻转体。
进一步地，所述凹槽环呈长方形状，其具有长度段以及宽度段，所述连接段位于所述凹槽环的长度段。
进一步地，所述片体上形成有两个所述凹槽环，两个所述凹槽环并列布置，各个所述凹槽环的包围区域内仅形成有一个所述翻转体。
进一步地，两个所述凹槽环相邻的部分相互重叠，形成重叠段。
进一步地，两个所述凹槽环的两个所述连接段分别位于所述重叠段正对的凹槽环上。
进一步地，所述片体包括形成在所述凹槽环外周的封闭环形的连接环。
进一步地，所述翻转体的厚度不小于所述连接环的厚度。
进一步地，所述刻痕形成在所述凹槽环的中部。
 有益效果
与现有技术相比，本实用新型提供的爆破片，通过在片体上设置凹槽环，在凹槽内设置有非封闭环形的刻痕，凹槽环位于刻痕的两个端部之间的部分形成连接段，在凹槽环内形成有翻转体，这样，可以将爆破片的刚性增大，当受到的压力未到达临界点时，该刚性大的爆破片不易发生形变，避免对锂电池内部的压力变化产生影响，当压力达到预先设置的临界点时，爆破片于刻痕处爆破，使得翻转体绕着连接段翻转，此时翻转体原来的位置形成孔洞，锂电池内部的异常气体通过孔洞及时泄出，避免锂电池发生爆炸的危险，解决了面积较大的爆破片容易发生形变，使得电池内部容积增加，延迟爆破片的爆破时间，使得锂电池的爆破机制不能及时做出反应，导致电池发生爆炸的危险的问题。
 附图说明
图1是本实用新型实施例提供的爆破片的片体上设置一个爆破单元时的俯视示意图；
图2是图1中A-A处的剖视示意图；
图3是本实用新型实施例提供的爆破片的片体上设置两个爆破单元时的俯视示意图。
 本发明的实施方式
为了使本实用新型的目的、技术方案及优点更加清楚明白，以下结合附图及实施例，对本实用新型进行进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本实用新型，并不用于限定本实用新型。
以下结合具体实施例对本实用新型的实现进行详细的描述。
本实施例的附图中相同或相似的标号对应相同或相似的部件；在本实用新型的描述中，需要理解的是，若有术语“上”、“下”、“左”、“右”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本实用新型和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此附图中描述位置关系的用语仅用于示例性说明，不能理解为对本专利的限制，对于本领域的普通技术人员而言，可以根据具体情况理解上述术语的具体含义。
参照图所示，为本实用新型提供的较佳实施例。
本实用新型提供的爆破片，用于解决锂电池上的爆破片难以实现定向爆破，且破裂后的爆破片会产生较多碎片的问题，亦可用于其他类型的电池中，不仅限于本实施例。
爆破片，包括一体成型的片体，在片体上形成有封闭环形的凹槽环11，本实施例中，凹槽环11的宽度处处相等。在片体形成有处于凹槽环11包围区域内的翻转体12；凹槽环11内设置有非封闭环形的刻痕13，刻痕13沿凹槽环11的环绕方向环绕，凹槽环11位于刻痕13的两个端部之间的部分形成供翻转体12翻转的连接段14。
通过在片体上设置凹槽环11，在凹槽内设置有非封闭环形的刻痕13，凹槽环11位于刻痕13的两个端部之间的部分形成连接段14，在凹槽环11内形成有翻转体12，这样，可以将爆破片的刚性增大，当受到的压力未到达临界点时，该刚性大的爆破片不易发生形变，避免对锂电池内部的压力变化产生影响，当压力达到预先设置的临界点时，爆破片于刻痕13处爆破，使得翻转体12绕着连接段14翻转，此时翻转体12原来的位置形成孔洞，锂电池内部的异常气体通过孔洞及时泄出，避免锂电池发生爆炸的危险，解决了爆破片容易发生形变以及刚性较大的爆破片不能及时爆破，导致锂电池产生爆炸的危险的问题。
本实施例中，片体上形成有一个凹槽环11，该凹槽环11的包围区域内仅形成有一个翻转体12。当锂电池内部压力过大时，凹槽环11内的刻痕13处裂开，使得锂电池内部的异常气体通过翻转体12翻转后形成的孔洞泄出，使得锂电池的使用更加安全。其中，凹槽环11的大小可根据实际需要进行设置。
具体地，凹槽环11呈长方形状，其具有长度段以及宽度段，连接段14位于凹槽环11的长度段。这样，在翻转片进行翻转时，其所需要的空间高度相对较小，便于设置了爆破片的锂电池安装在设备的内部。
本实施例中，片体上形成有两个凹槽环11，两个凹槽环11并列布置，各个凹槽环11的包围区域内仅形成有一个翻转体12。这样，在凹槽环11总体面积不变的情况下，可以使得凹槽环11设置得更小，设置在凹槽环11内的翻转体12亦可设置得更小，便于爆破片的使用。根据实际需要，凹槽环11可设置为三个或以上。
具体地，两个凹槽环11相邻的部分相互重叠，形成重叠段。当锂电池内部压力过大时，两个翻转体12分别进行翻转时，形成的两个孔洞相互连通，形成一个大的孔洞，使得锂电池内部的异常气能够更快的泄出。
具体地，两个凹槽环11的两个连接段14分别位于重叠段正对的凹槽环11上。这样，当锂电池内部压力过大时，两个翻转体12往两侧相对翻转，能够更快的泄压，避免锂电池出现爆炸的情况。
本实施例中，片体包括形成在凹槽环11外周的封闭环形的连接环15。该连接环15内侧与凹槽环11连接，外层与顶盖板连接，使得翻转片能够和顶盖板实现无缝对接，方便翻转片的使用。
具体地，翻转体12的厚度不小于连接环15的厚度。这样，使得爆破的刚性及强度进一步增大，避免爆破片发生形变，同时可以避免爆破片在爆破过程中翻转体12出现破损，产生爆破碎片，增加后续的清理及更换的难度。
本实施例中，刻痕13形成在凹槽环11的中部。这样，在凹槽环11受到锂电池内部的压力时，位于凹槽环11中部的刻痕13能够及时的裂开，使得翻转体12能够及时翻转，锂电池内部的压力能够及时泄出。
以上所述仅为本实用新型的较佳实施例而已，并不用以限制本实用新型，凡在本实用新型的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本实用新型的保护范围之内。

Claims (9)

  1. 爆破片，其特征在于，包括一体成型的片体，所述片体上形成有封闭环形的凹槽环，所述片体形成有处于所述凹槽环包围区域内的翻转体；所述凹槽环内设置有非封闭环形的刻痕，所述刻痕沿所述凹槽环的环绕方向环绕，所述凹槽环位于所述刻痕的两个端部之间的部分形成供所述翻转体翻转时的连接段。
  2. 如权利要求1所述的爆破片，其特征在于，所述片体上形成有一个所述凹槽环，所述凹槽环的包围区域内仅形成有一个所述翻转体。
  3. 如权利要求2所述的爆破片，其特征在于，所述凹槽环呈长方形状，其具有长度段以及宽度段，所述连接段位于所述凹槽环的长度段。
  4. 如权利要求1所述的爆破片，其特征在于，所述片体上形成有两个所述凹槽环，两个所述凹槽环并列布置，各个所述凹槽环的包围区域内仅形成有一个所述翻转体。
  5. 如权利要求4所述的爆破片，其特征在于，两个所述凹槽环相邻的部分相互重叠，形成重叠段。
  6. 如权利要求5所述的爆破片，其特征在于，两个所述凹槽环的两个所述连接段分别位于所述重叠段正对的凹槽环上。
  7. 如权利要求1至6任一项所述的爆破片，其特征在于，所述片体包括形成在所述凹槽环外周的封闭环形的连接环。
  8. 如权利要求7所述的爆破片，其特征在于，所述翻转体的厚度不小于所述连接环的厚度。
  9. 如权利要求1至6任一项所述的爆破片，其特征在于，所述刻痕形成在所述凹槽环的中部。
PCT/CN2018/081953 2017-08-16 2018-04-04 爆破片 WO2019033767A1 (zh)

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