WO2019165648A1 - 顶盖组件和二次电池 - Google Patents

顶盖组件和二次电池 Download PDF

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Publication number
WO2019165648A1
WO2019165648A1 PCT/CN2018/078415 CN2018078415W WO2019165648A1 WO 2019165648 A1 WO2019165648 A1 WO 2019165648A1 CN 2018078415 W CN2018078415 W CN 2018078415W WO 2019165648 A1 WO2019165648 A1 WO 2019165648A1
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WIPO (PCT)
Prior art keywords
top cover
hole
secondary battery
assembly
reinforcing beam
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PCT/CN2018/078415
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English (en)
French (fr)
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陈兵
郭志君
王鹏
王志宇
张捷
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宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to US16/358,366 priority Critical patent/US20190267582A1/en
Publication of WO2019165648A1 publication Critical patent/WO2019165648A1/zh

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • 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
    • 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 the field of batteries, and more particularly to a top cover assembly and a secondary battery.
  • Currently used secondary batteries generally include a housing, an electrode assembly housed in the housing, and a top cover fixed to the housing.
  • a rupture disk is generally provided on the top cover.
  • the top cover is usually made of plastic or aluminum alloy. When the secondary battery is working normally, some gas will also be generated inside, and the generated gas will cause deformation of the top cover (especially the top cover made of plastic, which is more severely deformed). The deformation of the top cover may cause the connection between the rupture disk and the top cover to be loose. When the internal pressure of the secondary battery reaches a certain pressure, the rupture disk may be disengaged from the connection portion and cannot be broken from the preset position.
  • the stability and consistency of the explosion-proof structure cannot be guaranteed, and the safety performance of the secondary battery is affected; in addition, if the rupture disk and the top cover are When the connection portion is loose, when the internal pressure of the secondary battery is within a safe range, the rupture disk may also be detached from the connection portion, thereby causing the secondary battery to fail.
  • an object of the present invention is to provide a top cover assembly and a secondary battery which can improve the stability and consistency of the explosion-proof function of the top cover assembly and improve the safety performance of the secondary battery.
  • the present invention provides a top cover assembly including a top cover, a reinforcing structure and a rupture disk.
  • the top cover is provided with a through hole; the rupture disk is fixed to the top cover and covers the through hole from the upper side.
  • the reinforcing structure is disposed in the through hole and fixed to the hole wall of the through hole, and the reinforcing structure partially shields the through hole.
  • the present invention provides a secondary battery comprising: a housing having an opening at the top; an electrode assembly housed in the housing; and the top cover according to the first aspect of the present invention The assembly is fixed to the top of the housing.
  • the provision of the reinforcing structure in the through hole can increase the strength of the top cover, thereby reducing the deformation of the top cover when the internal pressure of the secondary battery increases, in particular, the deformation of the top cover at the through hole, thereby ensuring the rupture disk.
  • the connection strength with the top cover improves the stability and consistency of the explosion-proof function of the top cover assembly, and improves the safety performance of the secondary battery.
  • Figure 1 is a plan view of a secondary battery according to the present invention, in which a rupture disk is omitted.
  • Figure 2 is a cross-sectional view taken along line A-A of Figure 1.
  • Figure 3 is an enlarged view of a portion of the broken line frame of Figure 2.
  • FIG. 4 is a schematic illustration of a cap assembly in accordance with the present invention.
  • Figure 5 is another schematic view of a cap assembly in accordance with the present invention with the rupture disk omitted.
  • Figure 6 is a top plan view of another embodiment of a cap assembly in accordance with the present invention with the rupture disk omitted.
  • a top cover assembly 1 includes a top cover 11, a reinforcing structure 12, and a rupture disk 13.
  • the top cover 11 is provided with a through hole 111; the rupture disk 13 is fixed to the top cover 11 and covers the through hole 111 from the upper side.
  • the reinforcing structure 12 is disposed in the through hole 111 and fixed to the hole wall of the through hole 111, and the reinforcing structure 12 partially shields the through hole 111.
  • the cap assembly 1 is a component of a secondary battery for enclosing the electrode assembly 3 of the secondary battery in the casing 2.
  • a part of the gas is generated inside, causing the top cover 1 to be deformed.
  • Providing the reinforcing structure 12 in the through hole 111 can increase the strength of the top cover 11 (especially the strength of the portion of the top cover 11 around the through hole 111), thereby reducing the pressure of the top cover 11 when the internal pressure of the secondary battery increases.
  • the amount of deformation in particular, the amount of deformation of the top cover 11 at the through hole 111, thereby ensuring the connection strength between the rupture disk 13 and the top cover 11, improving the stability and consistency of the explosion-proof function of the top cover assembly 1, and improving the second Secondary battery safety performance.
  • the reinforcing structure 12 only partially obscures the through hole 111, and does not restrict the discharge of gas inside the secondary battery.
  • the top cover 11 and the reinforcing structure 12 are integrally formed and both materials are plastic. Compared with the conventional top cover made of aluminum alloy, the weight of the plastic is small, and the energy density of the secondary battery can be improved; at the same time, the top cover 11 and the reinforcing structure 12 can be formed by injection molding, and the cost is low. Of course, the top cover 11 made of plastic is more easily deformed, so it is more necessary to increase the strength by providing the reinforcing structure 12, thereby reducing the amount of deformation of the top cover 11 when the internal pressure of the secondary battery increases.
  • the plastic is polypropylene.
  • the rupture disk 13 is a sheet having a uniform thickness and is made of plastic.
  • the upper surface of the top cover 11 is provided with a downwardly recessed recess 112, and the rupture disk 13 is fixedly coupled to the bottom wall of the recess 112 by heat fusion.
  • the upper surface of the rupture disk 13 is lower than the upper surface of the top cover 11, that is, the rupture disk 13 has a thickness smaller than the depth of the groove 112.
  • the through hole 111 extends downward from the bottom wall of the recess 112.
  • the groove 112 can function as a positioning.
  • the depth of the groove 112 may be 0.3 mm to 1 mm.
  • the upper surface of the reinforcing structure 12 is lower than the bottom wall of the recess 112, so that the rupture disk 13 is not in contact with the reinforcing structure 12, and the occurrence of partial rupture of the rupture disk 13 is avoided.
  • the top cover assembly 1 further includes an electrode terminal 14 for electrical connection with the electrode assembly 3 of the secondary battery.
  • the through hole 111 is a liquid injection hole for injecting an electrolyte.
  • the electrolyte may be injected into the interior of the secondary battery directly through the through hole 111.
  • the liquid injection process is before the rupture disk 13 is installed.
  • the top cover is usually provided with a separate liquid injection hole and an explosion-proof hole, and the rupture disk is used to close the explosion-proof hole.
  • the separate liquid injection holes and explosion-proof holes occupy a large space of the top cover, thereby limiting the size of the electrode terminals provided to the top cover.
  • other components are required to seal the liquid injection hole, which results in a complicated forming process and a high cost of the top cover.
  • the top cover assembly 1 of the present invention directly injects the liquid through the explosion-proof through hole 111, and integrates the conventional liquid injection hole and the explosion-proof hole, thereby simplifying the molding process and reducing the cost.
  • the external liquid filling head needs to press the top cover 11 from above the through hole 111. Since the reinforcing structure 12 can increase the strength of the top cover 11 at the through hole 111, the deformation amount of the top cover 11 at the time of liquid filling can be reduced, and the top cover 11 can be prevented from collapsing to the inside of the casing 2, and the top cover can be prevented. 11 crushes the electrode assembly 3.
  • a vent hole H through which the liquid supply head passes may be provided in the middle of the reinforcing structure 12.
  • the bottom wall of the groove 112 easily collapses downward and plastically deforms (especially the bottom wall contacts the liquid filling head). The portion), which in turn affects the flatness of the bottom wall of the recess 112.
  • the rupture disk 13 since the flatness of the bottom wall of the groove 112 is poor, in the process of welding, the bottom wall of the rupture disk 13 and the groove 112 may be in poor contact, the connection strength is lowered, and the sealing property is affected.
  • the reinforcing structure 12 includes a first reinforcing beam 121, and both ends of the first reinforcing beam 121 are fixed to the hole wall of the through hole 111.
  • the first reinforcing beam 121 extends in the longitudinal direction X.
  • the first reinforcing beam 121 may be a plurality of and arranged in parallel, and the distance between the adjacent two first reinforcing beams 121 may be 3 mm to 5 mm.
  • the first reinforcing beam 121 has a rectangular cross section.
  • the reinforcing structure 12 further includes a second reinforcing beam 122 crossing the first reinforcing beam 121, and both ends of the second reinforcing beam 122 are fixed to the hole wall of the through hole 111.
  • the second reinforcing beam 122 extends in the width direction Y.
  • the second reinforcing beams 122 are arranged in plurality and in parallel, and the distance between the adjacent two second reinforcing beams 122 may be 3 mm to 5 mm.
  • the plurality of first reinforcing beams 121 intersect with the plurality of second reinforcing beams 122 and enclose a vent hole H.
  • the second reinforcing beam 122 has a rectangular cross section.
  • the reinforcing structure 12 includes a third reinforcing beam 123 and a fourth reinforcing beam 124.
  • the third reinforcing beam 123 is annular, and the fourth reinforcing beam 124 is disposed around the third reinforcing beam 123.
  • the third reinforcing beam 123 and the hole wall of the through hole 111 are connected.
  • the third reinforcing beam 123 encloses a vent hole H.
  • a secondary battery according to the present invention includes: a case 2 having an opening at the top; an electrode assembly 3 housed in the case 2; and a cap assembly 1 according to the first aspect of the present invention, Fixed to the top of the housing 2.
  • the electrode assembly 3 includes a positive electrode sheet, a negative electrode sheet, and a separator that separates the positive electrode sheet from the negative electrode sheet.
  • the electrode terminals 14 are two and electrically connected to the positive electrode tab and the negative electrode tab, respectively.
  • Providing the reinforcing structure 12 in the through hole 111 can increase the strength of the top cover 11 (especially the strength of the portion of the top cover 11 around the through hole 111), thereby reducing the pressure of the top cover 11 when the internal pressure of the secondary battery increases.
  • the amount of deformation in particular, the amount of deformation of the top cover 11 at the through hole 111, thereby ensuring the connection strength between the rupture disk 13 and the top cover 11, improving the stability and consistency of the explosion-proof function of the top cover assembly 1, and improving the second Secondary battery safety performance.
  • the top cover assembly 1 of the present invention directly injects the liquid through the explosion-proof through hole 111, and integrates the conventional liquid injection hole and the explosion-proof hole, thereby simplifying the molding process and reducing the cost.
  • the reinforcing structure 12 can increase the strength of the top cover 11 at the through hole 111, reduce the deformation amount of the top cover 11 at the time of liquid injection, and prevent the top cover 11 from collapsing to the inside of the housing 2, preventing the top cover 11 from being collapsed.
  • the electrode assembly 3 is crushed to improve the safety performance of the secondary battery.
  • the material of the casing 2 is preferably plastic.
  • the housing 2 can be welded to the top cover 11.
  • the housing 2 and the top cover 11 made of plastic have a small weight, which can increase the energy density of the secondary battery, and the molding process is simple, and the cost is effectively reduced.

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

Abstract

本发明提供了一种顶盖组件和二次电池。顶盖组件包括顶盖板、加强结构和防爆片。顶盖板设有通孔；防爆片固定于顶盖板并从上侧覆盖通孔。加强结构设置于通孔内并固定于通孔的孔壁，且加强结构部分遮蔽通孔。二次电池包括：壳体，顶部具有开口；电极组件，收容于壳体内；以及根据本发明第一方面所述的顶盖组件，固定于壳体的顶部。二次电池在正常工作时，其内部会产生部分气体，导致内部压力增大。在通孔内设置加强结构可以增加顶盖板的强度，从而降低顶盖板在二次电池内部压力增大时的变形量，特别是顶盖板在通孔处的变形量，进而保证防爆片与顶盖板的连接强度，改善顶盖组件的防爆功能的稳定性和一致性，提高二次电池的安全性能。

Description

顶盖组件和二次电池 技术领域
本发明涉及电池领域，尤其涉及一种顶盖组件和二次电池。
背景技术
目前常用的二次电池通常包括壳体、收容于壳体内的电极组件以及固定于壳体的顶盖板。为了保证二次电池的安全性，一般会在顶盖板上设置防爆片，当二次电池由于充电、短路等原因发生意外时，内部会产生大量气体，气体能够冲开防爆片以达到泄压的目的。
顶盖板通常由塑胶或铝合金制成。二次电池正常工作时，其内部也会产生部分气体，而产生的气体会导致顶盖板变形(特别是塑胶制成的顶盖板，其变形更严重)。顶盖板的变形可导致防爆片与顶盖板的连接部位松动，当二次电池内部达到一定压力时，防爆片可能会从所述连接部位脱开，而无法从预先设定的位置破开(通常通过在防爆片上设置刻痕，使防爆片从中部区域破开)，所以无法保证防爆结构的稳定性和一致性，影响二次电池的安全性能；另外，如果防爆片与顶盖板的连接部位松动，那么当二次电池的内压在安全范围内时，防爆片也可能会从所述连接部位脱开，从而导致二次电池失效。
发明内容
鉴于背景技术中存在的问题，本发明的目的在于提供一种顶盖组件和二次电池，其能改善顶盖组件的防爆功能的稳定性和一致性，提高二次电池的安全性能。
为了实现上述目的，在第一方面，本发明提供了一种顶盖组件，其包括顶盖板、加强结构和防爆片。顶盖板设有通孔；防爆片固定于顶盖板并从上侧覆盖通孔。加强结构设置于通孔内并固定于通孔的孔壁，且加强结构部分遮蔽通孔。
为了实现上述目的，在第二方面，本发明提供了一种二次电池，其包括：壳体，顶部具有开口；电极组件，收容于壳体内；以及根据本发明第一方面所述的顶盖组件，固定于壳体的顶部。
本发明的有益效果如下：
二次电池在正常工作时，其内部会产生部分气体，导致内部压力增大。在通孔内设置加强结构可以增加顶盖板的强度，从而降低顶盖板在二次电池内部压力增大时的变形量，特别是顶盖板在通孔处的变形量，进而保证防爆片与顶盖板的连接强度，改善顶盖组件的防爆功能的稳定性和一致性，提高二次电池的安全性能。
附图说明
图1为根据本发明的二次电池的俯视图，其中防爆片省略。
图2为图1沿线A-A作出的剖视图。
图3为图2虚线框部分的放大图。
图4为根据本发明的顶盖组件的示意图。
图5为根据本发明的顶盖组件的另一示意图，其中防爆片省略。
图6为根据本发明的顶盖组件的另一实施例的俯视图，其中防爆片省略。
其中，附图标记说明如下：
1顶盖组件                    13防爆片
  11顶盖板                   14电极端子
    111通孔                2壳体
    112凹槽                3电极组件
  12加强结构               H透气孔
    121第一加强梁          X长度方向
    122第二加强梁          Y宽度方向
    123第三加强梁          Z高度方向
    124第四加强梁
具体实施方式
下面参照附图来详细说明本发明的顶盖组件和二次电池。
首先说明根据本发明第一方面的顶盖组件。
参照图1至图6，根据本发明的顶盖组件1包括顶盖板11、加强结构12和防爆片13。顶盖板11设有通孔111；防爆片13固定于顶盖板11并从上侧覆盖通孔111。加强结构12设置于通孔111内并固定于通孔111的孔壁，且加强结构12部分遮蔽通孔111。
根据本发明的顶盖组件1为二次电池的一个部件，用于将二次电池的电极组件3封闭在壳体2内。二次电池正常工作时，其内部会产生部分气体，从而导致顶盖板1变形。
在通孔111内设置加强结构12可以增加顶盖板11的强度(尤其是顶盖板11位于通孔111周围的部分的强度)，从而降低顶盖板11在二次电池内部压力增大时的变形量，特别是顶盖板11在通孔111处的变形量，进而保证防爆片13与顶盖板11的连接强度，改善顶盖组件1的防爆功能的稳定性和一致性，提高二次电池的安全性能。同时，加强结构12仅部分遮蔽通孔111，不会限制二次电池内部气体的排出。
顶盖板11和加强结构12一体形成且两者材质均为塑胶。与传统的由铝合金制成的顶盖板相比，塑胶的重量小，可以提高二次电池的能量密度；同时，顶盖板11和加强结构12可采用注塑的方式成型，成本较低。当然，塑胶制成的顶盖板11更容易变形，所以更需要通过设置加强结构12来提高强度，进而降低顶盖板11在二次电池内部压力增大时的变形量。优选地，塑胶为聚丙烯。
防爆片13为厚度均匀的薄片，且其材质为塑胶。
参照图4，顶盖板11上表面设有向下凹陷的凹槽112，防爆片13通过热熔的方式固定连接于凹槽112的底壁。防爆片13的上表面低于顶盖板11的上表面，即防爆片13的厚度小于凹槽112的深度。通孔111从凹槽112的底壁向下延伸。在安装防爆片13时，凹槽112可起到定位作用。凹槽112的深度可为0.3mm～1mm。
参照图2和图4，在高度方向Z上，加强结构12的上表面低于凹槽112的底壁，从而使防爆片13不与加强结构12接触，避免出现防爆片13部分突出的情况。
参照图2，顶盖组件1还包括电极端子14，用于与二次电池的电极组件 3电连接。
通孔111为供电解液注入的注液孔。在制备二次电池的过程中，可直接经由通孔111向二次电池内部注入电解液。当然，注液工艺是在安装防爆片13之前。
在传统的二次电池中，顶盖板上通常设置有独立的注液孔和防爆孔，而防爆片则用于封闭防爆孔。但是，独立的注液孔和防爆孔占用顶盖板的空间较大，从而会限制设置于顶盖板的电极端子的尺寸。另外，注液完成后，还需要其它的部件密封注液孔，导致顶盖板的成型工艺复杂、成本高。而本发明的顶盖组件1直接利用防爆的通孔111进行注液，将传统的注液孔和防爆孔合为一体，从而简化成型工艺，降低成本。
在注液时，外部的注液头需要从通孔111的上方下压顶盖板11。由于加强结构12可以增加顶盖板11在通孔111处的强度，因此可以降低顶盖板11在注液时的变形量，避免顶盖板11向壳体2的内部塌陷，防止顶盖板11压伤电极组件3。
参照图5，为了防止加强结构12阻挡注液头，可在加强结构12中部设置供注液头穿过的透气孔H。
注液时，如果通孔111内没有加强结构12，那么注液头下压顶盖板11时，凹槽112的底壁很容易向下塌陷并产生塑性变形(特别是底壁与注液头接触的部分)，进而影响凹槽112的底壁的平整性。在安装防爆片13时，由于凹槽112底壁的平整性差，所以在熔接的过程中，会导致防爆片13和凹槽112的底壁接触不良，降低连接强度，影响密封性。
在一实施例中，参照图5，加强结构12包括第一加强梁121，第一加强梁121的两端固定于通孔111的孔壁。优选地，第一加强梁121沿长度方向X延伸。当二次电池的内压增大时，顶盖板11在长度方向X上的更容易变形，而长度方向X延伸的第一加强梁121则可以降低变形量。进一步地，第一加强梁121可为多个并平行布置，相邻两个第一加强梁121的距离可为3mm～5mm。第一加强梁121的截面为矩形。
参照图5，为了进一步提高顶盖板11的强度，加强结构12还包括与第一加强梁121交叉的第二加强梁122，第二加强梁122的两端固定于通孔111的孔壁。优选地，第二加强梁122沿宽度方向Y延伸。进一步地，第二加强 梁122为多个并平行布置，相邻两个第二加强梁122的距离可为3mm～5mm。多个第一加强梁121与多个第二加强梁122交叉并围成透气孔H。第二加强梁122的截面为矩形。
在另一实施例中，参照图6，加强结构12包括第三加强梁123和第四加强梁124，第三加强梁123为环形，第四加强梁124设置在第三加强梁123的四周并连接第三加强梁123和通孔111的孔壁。第三加强梁123围成透气孔H。
其次说明根据本发明第二方面的二次电池。
参照图1至图6，根据本发明的二次电池包括：壳体2，顶部具有开口；电极组件3，收容于壳体2内；以及根据本发明第一方面所述的顶盖组件1，固定于壳体2的顶部。
电极组件3包括正极片、负极片以及将正极片和负极片隔开的隔膜。电极端子14为两个并分别电连接于正极片和负极片。
二次电池在正常工作时，其内部会产生部分气体，导致内部压力增大。在通孔111内设置加强结构12可以增加顶盖板11的强度(尤其是顶盖板11位于通孔111周围的部分的强度)，从而降低顶盖板11在二次电池内部压力增大时的变形量，特别是顶盖板11在通孔111处的变形量，进而保证防爆片13与顶盖板11的连接强度，改善顶盖组件1的防爆功能的稳定性和一致性，提高二次电池的安全性能。
另外，本发明的顶盖组件1直接利用防爆的通孔111进行注液，将传统的注液孔和防爆孔合为一体，从而简化成型工艺，降低成本。同时，加强结构12可以增加顶盖板11在通孔111处的强度，降低顶盖板11在注液时的变形量，避免顶盖板11向壳体2的内部塌陷，防止顶盖板11压伤电极组件3，提高二次电池的安全性能。
壳体2的材质优选为塑胶。壳体2可熔接于顶盖板11。由塑胶制成的壳体2和顶盖板11的重量小，可以提高二次电池的能量密度，同时成型工艺简单，有效地降低成本。

Claims (11)

  1. 一种顶盖组件(1)，包括：
    顶盖板(11)，设有通孔(111)；
    防爆片(13)，固定于顶盖板(11)并从上侧覆盖通孔(111)；
    其特征在于，
    顶盖组件(1)还包括设置于通孔(111)内的加强结构(12)，加强结构(12)固定于通孔(111)的孔壁且部分遮蔽通孔(111)。
  2. 根据权利要求1所述的顶盖组件(1)，其特征在于，通孔(111)为供电解液注入的注液孔。
  3. 根据权利要求1所述的顶盖组件(1)，其特征在于，加强结构(12)包括第一加强梁(121)，第一加强梁(121)的两端固定于通孔(111)的孔壁。
  4. 根据权利要求3所述的顶盖组件(1)，其特征在于，第一加强梁(121)沿长度方向(X)延伸。
  5. 根据权利要求3或4所述的顶盖组件(1)，其特征在于，加强结构(12)还包括与第一加强梁(121)交叉的第二加强梁(122)，第二加强梁(122)的两端固定于通孔(111)的孔壁。
  6. 根据权利要求1所述的顶盖组件(1)，其特征在于，加强结构(12)包括第三加强梁(123)和第四加强梁(124)，第三加强梁(123)为环形，第四加强梁(124)设置在第三加强梁(123)的四周并连接第三加强梁(123)和通孔(111)的孔壁。
  7. 根据权利要求1所述的顶盖组件(1)，其特征在于，顶盖板(11)和加强结构(12)一体形成且其材质均为塑胶。
  8. 根据权利要求1所述的顶盖组件(1)，其特征在于，防爆片(13)为厚度均匀的薄片，且其材质为塑胶。
  9. 根据权利要求8所述的顶盖组件(1)，其特征在于，顶盖板(11)上表面设有向下凹陷的凹槽(112)，防爆片(13)通过热熔的方式固定连接于凹槽(112)的底壁，且防爆片(13)的上表面低于顶盖板(11)的上表面；通孔(111)从凹槽(112)的底壁向下延伸。
  10. 根据权利要求9所述的顶盖组件(1)，其特征在于，在高度方向(Z)上，加强结构(12)的上表面低于凹槽(112)的底壁。
  11. 一种二次电池，包括：
    壳体(2)，顶部具有开口；
    电极组件(3)，收容于壳体(2)内；以及
    根据权利要求1-10中任一项所述的顶盖组件(1)，固定于壳体(2)的顶部。
PCT/CN2018/078415 2018-02-27 2018-03-08 顶盖组件和二次电池 WO2019165648A1 (zh)

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