WO2020057442A1 - 顶盖组件以及二次电池 - Google Patents

顶盖组件以及二次电池 Download PDF

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Publication number
WO2020057442A1
WO2020057442A1 PCT/CN2019/105714 CN2019105714W WO2020057442A1 WO 2020057442 A1 WO2020057442 A1 WO 2020057442A1 CN 2019105714 W CN2019105714 W CN 2019105714W WO 2020057442 A1 WO2020057442 A1 WO 2020057442A1
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WO
WIPO (PCT)
Prior art keywords
top cover
connection
isolation member
cover sheet
assembly according
Prior art date
Application number
PCT/CN2019/105714
Other languages
English (en)
French (fr)
Inventor
赵丰刚
曾毓群
郭剑
李全坤
王鹏
Original Assignee
宁德时代新能源科技股份有限公司
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 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 EP19858674.5A priority Critical patent/EP3671887B1/en
Priority to US16/976,752 priority patent/US11777162B2/en
Publication of WO2020057442A1 publication Critical patent/WO2020057442A1/zh
Priority to US18/237,902 priority patent/US12119503B2/en

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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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 application relates to the technical field of batteries, and in particular, to a top cover assembly and a secondary battery.
  • a secondary battery case includes a case and a top cover assembly.
  • the top cover is a metal plate and has a through hole.
  • the pole includes an extension portion that passes through the through hole and is exposed outside the top cover plate.
  • An insulating member is sleeved on the extension portion, and a connecting block is provided above the insulating member.
  • the surface of the insulating member facing the connection block is provided with two anti-rotation protrusions, and the insulating member has a via hole located between the two anti-rotation protrusions, and the extension portion passes through the via hole.
  • the hole size of the via hole is limited, which results in that the radial dimension of the extension portion is small, and the overcurrent capability of the extension portion is deviated.
  • Embodiments of the present application provide a top cover assembly and a secondary battery.
  • the top cover assembly can improve the overcurrent capability and stability of the electrode terminal.
  • an embodiment of the present application provides a top cover assembly for a secondary battery, which includes: a top cover sheet having an electrode lead-out hole; an electrode terminal covering the electrode lead-out hole, the electrode terminal including a body, and a side wall of the body A concave portion is provided; the isolation member has an accommodation cavity, and the body is accommodated in the accommodation cavity; the convex portion is connected to the inner wall of the isolation member and extends toward the axis of the electrode lead-out hole; wherein the convex portion is accommodated in the concave portion to Prevent the body from rotating relative to the isolation member.
  • the recessed portion penetrates the body in a thickness direction.
  • the body is a cylindrical structure, and a plurality of concave portions are provided on a side wall of the body, and the number of convex portions is equal to the number of concave portions.
  • the isolation member and the convex portion are of an integrated structure and are made of the same material.
  • the electrode terminal further includes an external segment, the external segment is located on a side of the body remote from the top cover sheet, and the body protrudes from a peripheral surface of the external segment.
  • the isolation member is in contact with the body, and a portion of the isolation member is located on a side of the body away from the top cover sheet in a thickness direction to prevent the body from moving in a direction away from the top cover sheet.
  • the top cover assembly further includes a connection member, the connection member is welded to the top cover sheet, the connection member is connected to the body through the isolation member, the connection member has a first connection portion, and the first connection portion is located away from the body One side of the top cover sheet, and a part of the isolation member is located between the first connection portion and the top cover sheet.
  • connection member further includes an intermediate transition portion and a second connection portion.
  • the intermediate transition portion is connected between the first connection portion and the second connection portion, and the second connection portion extends away from the body.
  • the first connection portion is a ring structure
  • the intermediate transition portion is a cylindrical structure
  • the second connection portion is a ring structure
  • the top cover sheet has a groove, and the second connecting portion is received in the groove.
  • the groove has a first plane and a first arc surface
  • the second connecting portion has a second plane and a second surface.
  • a circular arc surface, the first circular arc surface cooperates with the second circular arc surface, and the first plane and the second plane are connected to prevent the connecting member from rotating relative to the top cover piece.
  • a top cover assembly includes an isolation member and an electrode terminal connected to each other.
  • the isolation member is connected to the recess provided on the electrode terminal through a convex portion to prevent relative rotation between the isolation member and the body, and to ensure that the relative position of the two does not change, thereby ensuring the connection stability of the isolation member and the body.
  • the side wall of the electrode terminal body is provided with a concave portion, and the convex portion that cooperates with the concave portion is provided on the inner wall of the isolating member, it is beneficial to reduce the restriction and limitation of the radial size of the receiving cavity by the convex portion, and thus is beneficial Increasing the radial size of the accommodating cavity of the isolation member is beneficial to increasing the radial size of the body of the electrode terminal, thereby improving the overall overcurrent capability of the electrode terminal.
  • a secondary battery comprising: a case having an opening; an electrode assembly accommodated in the case; and, as described above, the top cover assembly covering the opening. To seal the electrode assembly in the case.
  • FIG. 1 is a schematic cross-sectional structure diagram of a secondary battery according to an embodiment of the present application.
  • FIG. 2 is a schematic cross-sectional structure diagram of a secondary battery according to another embodiment of the present application.
  • FIG. 3 is a partially exploded structural diagram of a top cover assembly according to an embodiment of the present application.
  • FIG. 4 is a schematic cross-sectional view of a top cover assembly according to an embodiment of the present application.
  • FIG. 5 is a partially enlarged schematic diagram at A in FIG. 4; FIG.
  • FIG. 6 is a schematic plan view of an electrode terminal according to an embodiment of the present application.
  • FIG. 7 is a schematic structural sectional view of an assembly of an electrode terminal, a separation member, and a connection member according to an embodiment of the present application;
  • FIG. 8 is a schematic structural diagram of an electrode terminal according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a connecting member according to an embodiment of the present application.
  • FIG. 10 is a schematic plan view of a top cover sheet according to an embodiment of the present application.
  • Top cover assembly 31. Top cover sheet; 311, electrode lead-out hole; 312, groove; 312a, first plane; 312b, first arc surface; 32, electrode terminal; 321, body; 322, recess; 323, outer section; 33, isolation member; 331, receiving cavity; 34, convex portion; 35, connecting member; 351, first connecting portion; 352, intermediate transition portion; 353, second connecting portion; 353a, second plane ; 353b, the second arc surface; 36, seals;
  • top cover assembly and the secondary battery 100 are described in detail below with reference to FIGS. 1 to 10.
  • a secondary battery 100 includes a case 10, an electrode assembly 20 disposed in the case 10, and a top cover assembly 30 connected to the case 10.
  • the housing 10 of this embodiment has one opening, so the number of the top cover assemblies 30 is also one.
  • the electrode assembly 20 of this embodiment is formed by spirally winding or stacking a positive electrode sheet, a negative electrode sheet, and a separator together.
  • the separator is an insulator interposed between the positive electrode sheet and the negative electrode sheet.
  • Each of the positive electrode sheet and the negative electrode sheet has a thin plate for conducting electricity.
  • the thin plate of the positive electrode sheet has a first coating region coated with a positive electrode active material and a positive electrode tab not coated with a positive electrode active material.
  • the thin plate of the negative electrode sheet has a second coating region coated with a negative electrode active material and a negative electrode tab not coated with an active material.
  • the electrode assembly 20 of this embodiment has two tabs 201 (that is, a positive tab and a negative tab), and the two tabs 201 are located on the same side, that is, both are disposed toward the top cover assembly 30.
  • the top cover assembly 30 of this embodiment includes a top cover sheet 31 and two electrode terminals 32 provided on the top cover sheet 31.
  • One of the two electrode terminals 32 serves as a positive electrode, and is electrically connected to the positive electrode ear through one connection piece 202; the other of the two electrode terminals 32 serves as a negative electrode, and is electrically connected to the negative electrode ear through another connection piece 202.
  • the top cover assembly 30 of this embodiment covers the opening of the casing 10 to close the electrode assembly 20 within the casing 10.
  • the secondary battery 100 includes a case 10, an electrode assembly 20 disposed in the case 10, and a top cover assembly 30 connected to the case 10.
  • the housing 10 of this embodiment has two oppositely disposed openings, so the number of the top cover assemblies 30 is also two.
  • the electrode assembly 20 has two tabs 201, and the two tabs 201 are disposed on opposite sides.
  • top cover assembly 30 includes two electrode terminals 32, but the same structure can also be applied to a structure in which the top cover assembly 30 includes one electrode terminal 32.
  • the top cover assembly 30 includes a top cover sheet 31, an electrode terminal 32, an isolation member 33, and a sealing member 36.
  • the top cover sheet 31 has an electrode lead-out hole 311.
  • the electrode terminal 32 is provided corresponding to the electrode lead-out hole 311, and the electrode terminal 32 covers the electrode lead-out hole 311.
  • the thickness direction X of this embodiment is the same as the axial direction of the electrode lead-out hole 311.
  • the electrode terminal 32 includes a body 321.
  • a recess 322 is provided on a side wall of the body 321.
  • the isolation member 33 has a receiving cavity 331.
  • the body 321 is received in the receiving cavity 331.
  • the isolation member 33 is connected to the top cover sheet 31 so that the isolation member 33 can fix the electrode terminal 32.
  • the isolation member 33 is an insulating material (such as plastic or rubber), so that the electrode terminal 32 and the top cover sheet 31 remain insulated and isolated.
  • the material of the isolation member 33 may also be a conductive material, for example, a conductive material such as conductive carbon is doped in an insulating material such as plastic or rubber to make the isolation material 33.
  • One of the two electrode terminals 32 may be insulated from the top cover sheet 31.
  • the sealing member 36 of this embodiment is disposed between the body 321 and the top cover sheet 31 included in the electrode terminal 32 so as to maintain a sealed state between the top cover sheet 31 and the body 321.
  • the seal 36 is a ring structure.
  • the material of the sealing member 36 may be rubber, silicone, or the like.
  • the top cover assembly 30 of this embodiment further includes a connecting member 35.
  • the connection member 35 is connected to the separation member 33.
  • the connection member 35 is connected to the body 321 included in the electrode terminal 32 through the separation member 33.
  • the connection member 35 and the electrode terminal 32 are separated by the isolation member 33, and the two are not in direct contact.
  • the connection member 35 may be made of metal to ensure sufficient connection strength. Further, the connection member 35 is welded to the top cover sheet 31 to fix the positions of the isolation member 33 and the electrode terminal 32.
  • the isolation member 33 of this embodiment is in contact with the body 321, and a part of the isolation member 33 is located on the side of the body 321 away from the top cover sheet 31 in the thickness direction X, so as to apply pressure to the body 321 toward the top cover sheet 31, The body 321 is prevented from moving in a direction away from the top cover sheet 31.
  • the connection member 35 includes a first connection portion 351.
  • the first connection portion 351 is located on a side of the body 321 remote from the top cover sheet 31, and a part of the isolation member 33 is located between the first connection portion 351 and the top cover sheet 31.
  • the first connecting portion 351 can apply pressure to the top cover sheet 31 to the isolation member 33 and the electrode terminal 32 to compress the electrode terminal 32 to ensure the electrode terminal 32.
  • the stable position further effectively prevents the body 321 from moving in a direction away from the top cover sheet 31.
  • a part of the isolation member 33 is located on a side of the body 321 away from the top cover sheet 31, so that a contact area between the isolation member 33 and the body 321 is increased.
  • the first connection portion 351 can increase the pressure between the isolation member 33 and the surface of the body 321 away from the top cover sheet 31, thereby increasing the friction between the isolation member 33 and the body 321, so that the isolation member 33 It is difficult to rotate relative to the body 321.
  • connection member 35 of this embodiment further includes an intermediate transition portion 352 and a second connection portion 353.
  • the intermediate transition portion 352 is connected between the first connection portion 351 and the second connection portion 353. Both the first connection portion 351 and the intermediate transition portion 352 are connected to the isolation member 33.
  • the second connection portion 353 extends in a direction away from the body 321 included in the electric terminal 32 and is connected to the top cover piece 31 by welding.
  • the body 321 in this embodiment has a cylindrical structure, and four side recesses 322 are provided on a side wall thereof.
  • the body 321 may also have a square pillar structure with a polygonal cross section, and the number of the recessed portions 322 provided thereon is not limited to four, and may be other numbers.
  • the four recesses 322 are uniformly distributed along the circumferential direction of the body 321.
  • the top cover assembly 30 of this embodiment further includes a convex portion 34.
  • the convex portion 34 is connected to an inner wall of the partition member 33.
  • the inner wall here refers to a surface of the partition member 33 forming the receiving cavity 331. The inner wall faces the body 321.
  • the convex portion 34 extends in the axial direction near the electrode lead-out hole 311.
  • the convex portion 34 is housed in a concave portion 322 provided on the body 321.
  • the shape of the convex portions 34 matches the shape of the concave portions 322, and the number of the convex portions 34 is equal to the number of the concave portions 322.
  • the concave portion 322 of this embodiment is provided on the side wall of the body 321, and the convex portion 34 that cooperates with the concave portion 322 is provided on the inner wall of the isolation member 33, it is beneficial to reduce the radial size of the convex portion 34 to the receiving cavity 331 Constraints and restrictions are conducive to increasing the radial size of the receiving cavity 331 of the isolating member 33, and further to increasing the radial size of the electrode terminal 32 body 321, and effectively improving the overall overcurrent capability of the electrode terminal 32.
  • the recessed portion 322 of this embodiment penetrates the body 321 in the thickness direction X.
  • the manner in which the recessed portion 322 penetrates the body 321 can increase the contact area between the protruding portion 34 and the recessed portion 322, increase the frictional force between the two, and help improve the anti-torsion performance.
  • the isolation member 33 and the convex portion 34 are of an integrated structure and are made of the same material, so that the connection strength of the isolation member 33 and the convex portion 34 is improved, and the connection strength of the convex portion 34 and the concave portion 322 is improved.
  • the isolation member 33 may be formed between the connection member 35 and the body 321 of the electrode terminal 32 at one time by an injection molding process.
  • the isolation member 33 can also completely cover the first connection portion 351 and the intermediate transition portion 352 of the connection member 35, thereby improving the connection strength of the isolation member 33 and the connection member 35, and indirectly improving the convexity 34 and the concaveness 322.
  • the connection strength improves the relative position stability of the isolation member 33 and the body 321.
  • the concave portion 322 has a structure penetrating the body 321, so that the plastic in a molten state is sufficient to fully fill the concave portion 322. If the recessed part 322 does not penetrate the body 321, during injection molding, the plastic in the molten state can easily fill the recessed part 322, which makes it easy to form voids or pores between the recessed part 322 and the protruding part 34, resulting in a reduction in the contact area between the protruding part 34 and the recessed part 322 small. Therefore, the penetration of the concave portion 322 through the body 321 is beneficial to ensure that the convex portion 34 and the concave portion 322 are completely in contact with each other and ensure good friction performance between the two.
  • the recessed portion 322 in this embodiment may also have a structure that does not penetrate the body 321 in the thickness direction X.
  • the convex portion 34 and the concave portion 322 of this embodiment are matched, on the one hand, the isolation member 33 and the body 321 can be effectively prevented from rotating relative to each other; on the other hand, the convex portion 34 applies the body 321 toward the top cover piece 31 through the concave portion 322. The pressure makes the position of the electrode terminal 32 more stable.
  • the electrode terminal 32 of this embodiment further includes an external section 323.
  • the external segment 323 penetrates the isolation member 33 so that the electrode terminal 32 can be electrically connected to external components such as the bus bar through the external segment 323.
  • the external segment 323 of this embodiment is located on a side of the body 321 away from the top cover sheet 31. In the radial direction of the electrode lead-out hole 311, the body 321 protrudes from the circumferential surface of the circumscribed section 323, that is, the projected area of the circumscribed section 323 in the thickness direction X is smaller than the projected area of the main body 321 in the thickness direction X.
  • a part of the first connection portion 351 of the connection member 35 can be pressed against the surface of the main body 321 protruding from the outer section 323.
  • the external segment 323 and the body 321 are both cylindrical structures.
  • the first connection portion 351 has a ring structure.
  • the intermediate transition portion 352 has a cylindrical structure.
  • the second connection portion 353 has a ring structure.
  • the isolation member 33 is a cylindrical structure, and the containing cavity 331 includes a hole-like structure. In this way, the isolation member 33 can surround the body 321 as a whole in the circumferential direction of the body 321, and the contact area between the two is larger. At the same time, under the tensioning action of the connecting member 35, the peripheral surface of the isolation member 33 and the body 321 are more tightly contacted, which increases the friction between the two and further reduces the possibility of relative rotation between the isolation member 33 and the body 321.
  • the top cover sheet 31 of this embodiment has a groove 312.
  • the second connection portion 353 of the connection member 35 is received in the groove 312.
  • the groove 312 has a first plane 312a and a first arc surface 312b.
  • the second connection portion 353 of this embodiment has a second flat surface 353 a and a second circular arc surface 353 b.
  • the top cover assembly 30 includes an isolation member 33 and an electrode terminal 32 connected to each other.
  • the isolation member 33 is connected to the recessed portion 322 provided on the electrode terminal 32 through the convex portion 34 to prevent relative rotation between the isolation member 33 and the body 321 and ensure that the relative position of the two does not change, thereby ensuring the isolation member 33 and the body. 321 connection stability.
  • the side wall of the body 321 of the electrode terminal 32 is provided with a concave portion 322, and the convex portion 34 matching the concave portion 322 is provided on the inner wall of the isolating member 33, it is beneficial to reduce the radial size of the convex portion 34 to the receiving cavity 331 Constraints and restrictions are conducive to increasing the radial size of the receiving cavity 331 of the isolation member 33, and further to increasing the radial size of the body 321 of the electrode terminal 32, thereby improving the overall overcurrent capability of the electrode terminal 32.

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

Abstract

一种顶盖组件（30）以及二次电池（100），顶盖组件（30）包括：顶盖片（31），具有电极引出孔（311）；电极端子（32），覆盖电极引出孔（311），电极端子（32）包括本体（321），本体（321）的侧壁设有凹部（322）；隔离构件（33），隔离构件（33）具有容纳腔（331），本体（321）容纳于容纳腔（331）；凸部（34），连接于隔离构件（33）的内壁，并且朝靠近电极引出孔（311）的轴线的方向延伸；其中，凸部（34）容纳于凹部（322），以阻止本体（321）相对于隔离构件（33）旋转，该顶盖组件（30）能够提高电极端子（32）的过流能力以及稳定性。

Description

顶盖组件以及二次电池
相关申请的交叉引用
本申请要求享有于2018年09月19日提交的名称为“顶盖组件以及二次电池”的中国专利申请201821535665.2的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别是涉及一种顶盖组件以及二次电池。
背景技术
新能源汽车在国内乃至世界都在广泛推广，但是要完全替代燃油汽车，还有很多需要改进之处。例如，汽车的行驶里程少，电池包成本高，电池包的可靠性等问题还需要进一步解决。基于上述的问题，对电动车的核心零件二次电池提出了更高的要求，例如需要二次电池达到更高的能量密度、更低的成本等。目前，二次电池外壳包括壳体和顶盖组件。现有的顶盖组件中，顶盖板为金属板并且开设通孔。极柱包括延伸部，延伸部穿过通孔并露出于顶盖板的外部。延伸部上套设有绝缘件并且绝缘件的上方设有连接块。绝缘件朝向连接块的表面设置有两个防转凸起，并且绝缘件具有位于两个防转凸起之间的过孔，延伸部穿过该过孔。然而，由于受到两个防转凸起的限制，该过孔的孔径大小受到限制，从而导致延伸部的径向尺寸偏小，进而使得延伸部的过流能力偏差。
发明内容
本申请实施例提供一种顶盖组件以及二次电池。顶盖组件能够提高电极端子的过流能力以及稳定性。
一方面，本申请实施例提出了一种用于二次电池的顶盖组件，其包 括：顶盖片，具有电极引出孔；电极端子，覆盖电极引出孔，电极端子包括本体，本体的侧壁设有凹部；隔离构件，隔离构件具有容纳腔，本体容纳于容纳腔；凸部，连接于隔离构件的内壁，并且朝靠近电极引出孔的轴线的方向延伸；其中，凸部容纳于凹部，以阻止本体相对于隔离构件旋转。
根据本申请实施例的一个方面，凹部沿厚度方向贯通本体。
根据本申请实施例的一个方面，本体为圆柱结构，本体的侧壁设有多个凹部，凸部的数量等于凹部的数量。
根据本申请实施例的一个方面，隔离构件和凸部为一体式结构并且材质相同。
根据本申请实施例的一个方面，电极端子还包括外接段，外接段位于本体的远离顶盖片的一侧，本体凸出于外接段的周向表面。
根据本申请实施例的一个方面，隔离构件与本体接触，并且在厚度方向上，隔离构件的一部分位于本体远离顶盖片的一侧，以阻止本体朝远离顶盖片的方向运动。
根据本申请实施例的一个方面，顶盖组件还包括连接构件，连接构件与顶盖片焊接，连接构件通过隔离构件与本体相连接，连接构件具有第一连接部，第一连接部位于本体远离顶盖片的一侧，并且部分的隔离构件位于第一连接部和顶盖片之间。
根据本申请实施例的一个方面，连接构件还具有中间过渡部以及第二连接部，中间过渡部连接于第一连接部和第二连接部之间，第二连接部朝远离本体的方向延伸。
根据本申请实施例的一个方面，第一连接部为环状结构，中间过渡部为筒状结构，第二连接部为环状结构。
根据本申请实施例的一个方面，顶盖片具有凹槽，第二连接部容纳于凹槽内，凹槽具有第一平面与第一圆弧面，第二连接部具有第二平面与第二圆弧面，第一圆弧面与第二圆弧面配合，第一平面和第二平面连接以阻止连接构件相对于顶盖片旋转。
根据本申请实施例的顶盖组件，其包括相互连接的隔离构件和电极端 子。隔离构件通过凸部与电极端子上设置的凹部相连接，以阻止隔离构件和本体之间发生相对转动，保证两者的相对位置不发生变化，从而保证隔离构件和本体的连接稳定性。同时，由于电极端子的本体的侧壁设置凹部，而与该凹部相配合的凸部设置于隔离构件的内壁，因此有利于降低凸部对容纳腔的径向尺寸的约束和限制，从而有利于增大隔离构件的容纳腔的径向尺寸，进而有利于增大电极端子的本体的径向尺寸，以此提高电极端子整体的过流能力。
另一个方面，根据本申请实施例提供一种二次电池，其特征在于，包括：壳体，具有开口；电极组件，容纳在壳体内；和，如上述的顶盖组件，顶盖组件覆盖开口，以将电极组件封闭在壳体内。
附图说明
下面将通过参考附图来描述本申请示例性实施例的特征、优点和技术效果。
图1是本申请一实施例的二次电池的剖视结构示意图；
图2是本申请另一实施例的二次电池的剖视结构示意图；
图3是本申请一实施例的顶盖组件的局部分解结构示意图；
图4是本申请一实施例的顶盖组件的剖视结构示意图；
图5是图4中A处局部放大示意图；
图6是本申请一实施例的电极端子的俯视结构示意图；
图7是本申请一实施例的电极端子、隔离构件和连接构件组装剖视结构示意图；
图8是本申请一实施例的电极端子的结构示意图；
图9是本申请一实施例的连接构件的结构示意图；
图10是本申请一实施例的顶盖片俯视结构示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
100、二次电池；
10、壳体；
20、电极组件；201、极耳；202、连接片；
30、顶盖组件；31、顶盖片；311、电极引出孔；312、凹槽；312a、第一平面；312b、第一圆弧面；32、电极端子；321、本体；322、凹部；323、外接段；33、隔离构件；331、容纳腔；34、凸部；35、连接构件；351、第一连接部；352、中间过渡部；353、第二连接部；353a、第二平面；353b、第二圆弧面；36、密封件；
X、厚度方向。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个或两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，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，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
下述描述中出现的方位词均为图中示出的方向，并不是对具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
为了更好地理解本申请，下面结合图1至图10根据本申请实施例的顶盖组件和二次电池100进行详细描述。
参见图1所示，本申请实施例的二次电池100包括壳体10、设置于壳 体10内的电极组件20以及与壳体10相连接的顶盖组件30。本实施例的壳体10具有一个开口，因此顶盖组件30的数量也是一个。
本实施例的电极组件20通过将正极极片、负极极片以及隔隔膜一同螺旋卷绕或堆叠而形成。隔膜是介于正极极片与负极极片之间的绝缘体。正极极片和负极极片各自均具有用于导电的薄板，正极极片的薄板具有涂覆有正极活性物质的第一涂覆区域和没有涂覆正极活性物质的正极极耳。负极极片的薄板具有涂覆有负极活性物质的第二涂覆区域和没有涂覆活性物质的负极极耳。本实施例的电极组件20具有两个极耳201(即正极极耳和负极极耳)，且两个极耳201位于同一侧，即均朝向顶盖组件30设置。本实施例的顶盖组件30具有顶盖片31以及设置于顶盖片31上的两个电极端子32。两个电极端子32中的一个作为正极，通过一个连接片202与正极耳电连接；两个电极端子32中的另一个作为负极，通过另一个连接片202与负极耳电连接。本实施例的顶盖组件30覆盖壳体10的开口，以将电极组件20封闭在壳体10内。
参见图2所示，本申请实施例的二次电池100包括壳体10、设置于壳体10内的电极组件20以及与壳体10相连接的顶盖组件30。本实施例的壳体10具有两个相对设置的开口，因此顶盖组件30的数量也是两个。电极组件20具有两个极耳201，且两个极耳201设置于相对的两侧。
以下实施例对一个顶盖组件30包括两个电极端子32的结构进行描述，但同样的结构也可以应用于一个顶盖组件30包括一个电极端子32的结构中。
参见图3所示，本申请实施例的顶盖组件30包括顶盖片31、电极端子32、隔离构件33以及密封件36。顶盖片31具有电极引出孔311。电极端子32与电极引出孔311相对应设置，并且电极端子32覆盖电极引出孔311。本实施例的厚度方向X与电极引出孔311的轴向相同。电极端子32包括本体321。本体321的侧壁设置凹部322。隔离构件33具有容纳腔331。本体321容纳于容纳腔331。隔离构件33与顶盖片31相连接，从而隔离构件33能够固定电极端子32。在顶盖片31为导电材料(例如铝、不锈钢等金属)的实施例中，隔离构件33为绝缘材料(例如塑胶或橡 胶)，从而使得电极端子32和顶盖片31保持绝缘隔离。可选地，隔离构件33的材料也可以是导电材料，例如在塑胶或橡胶等绝缘材料中掺入导电碳等导电物质，以使隔离材料33。两个电极端子32中，只要有一个电极端子32与顶盖片31绝缘即可。本实施例的密封件36设置于电极端子32所包括的本体321和顶盖片31之间，以使顶盖片31和本体321之间保持密封状态。可选地，密封件36为环状结构。密封件36的材料可以是橡胶或硅胶等。
参见图4、图5所示，本实施例的顶盖组件30还包括连接构件35。连接构件35与隔离构件33相连接。连接构件35通过隔离构件33与电极端子32所包括的本体321相连接。连接构件35与电极端子32被隔离构件33隔离开，两者不发生直接接触。连接构件35可为金属材质，以保证有足够的连接强度，进一步地，连接构件35与顶盖片31之间焊接连接，从而固定隔离构件33和电极端子32的位置。
本实施例的隔离构件33与本体321接触，并且在厚度方向X上，隔离构件33的一部分位于本体321上远离顶盖片31的一侧，以对本体321施加朝向顶盖片31的压力，阻止本体321朝远离顶盖片31的方向运动。在一个实施例中，连接构件35包括第一连接部351。第一连接部351位于本体321的远离顶盖片31的一侧，并且部分的隔离构件33位于第一连接部351和顶盖片31之间。这样，连接构件35与顶盖片31连接固定后，通过第一连接部351能够对隔离构件33和电极端子32施加朝向顶盖片31的压力，以压紧电极端子32，保证电极端子32的位置稳定，进一步有效阻止本体321朝远离顶盖片31的方向运动。另外，隔离构件33的一部分位于本体321上远离顶盖片31的一侧，使得隔离构件33与本体321的接触面积增大。第一连接部351能够使得隔离构件33与本体321远离顶盖片31的一侧的表面之间的压力增大，从而增大了隔离构件33和本体321之间的摩擦力，使得隔离构件33和本体321发生不易发生相对转动。
本实施例的连接构件35还包括中间过渡部352和第二连接部353。中间过渡部352连接于第一连接部351和第二连接部353之间。第一连接部351和中间过渡部352均与隔离构件33相连接。第二连接部353朝远离电 极端子32所包括的本体321的方向延伸，并与顶盖片31焊接连接。
参见图6所示，本实施例的本体321呈圆柱结构，其侧壁设有四个凹部322。但本体321也可以是截面为多边形的方柱结构，而其上设置的凹部322的数量并不限于四个，也可以是其他数量。优选地，四个凹部322沿本体321的周向均匀分布。参见图7所示，本实施例的顶盖组件30还包括凸部34。凸部34连接于隔离构件33的内壁。这里的内壁指的是隔离构件33形成容纳腔331的表面。该内壁朝向本体321。凸部34朝靠近电极引出孔311的轴线方向延伸。凸部34被容纳于设置于本体321上的凹部322内。可选地，凸部34的形状与凹部322的形状相匹配，而凸部34的数量与凹部322的数量相等。在凸部34与凹部322相配合后，能够有效阻止隔离构件33和本体321发生相对转动，保证两者相对位置的稳定。另外，由于本实施例的凹部322设置于本体321的侧壁，并且与凹部322相配合的凸部34设置于隔离构件33的内壁，因此有利于降低凸部34对容纳腔331的径向尺寸的约束和限制，从而有利于增大隔离构件33的容纳腔331的径向尺寸，进而有利于增大电极端子32本体321的径向尺寸，有效提高电极端子32整体的过流能力。
参见图6所示，本实施例的凹部322沿厚度方向X贯通本体321。凹部322贯通本体321的方式，能够增大凸部34与凹部322的接触面积，提升两者的摩擦力，有利于提升抗扭转性能。在一个示例中，隔离构件33与凸部34为一体式结构并且两者材质相同，从而提升隔离构件33和凸部34的连接强度，进而提升凸部34和凹部322的连接强度。隔离构件33和凸部34为一体式结构且为塑胶材质时，可以通过注塑工艺一次性在连接构件35和电极端子32的本体321之间形成隔离构件33。可选地，隔离构件33也可以将连接构件35的第一连接部351和中间过渡部352完全包覆，提升隔离构件33和连接构件35的连接强度，间接地提高凸部34和凹部322的连接强度，提升隔离构件33和本体321的相对位置稳定性。在采用注塑成型的方式加工制造隔离构件33和凸部34时，由于凹部322为贯通本体321的结构，从而有利于熔融状态的塑胶充分填充凹部322。如果凹部322不贯通本体321，在注塑成型时，熔融状态的塑胶容易填不 满凹部322，使得凹部322和凸部34之间容易形成空穴或气孔而导致凸部34和凹部322的接触面积减小。因此，凹部322贯通本体321有利于保证凸部34和凹部322完全接触贴合，保证两者之间的具有良好的摩擦性能。
参见图8所示，本实施例的凹部322也可以为沿厚度方向X不贯通本体321的结构。本实施例的凸部34与凹部322相配合时，一方面，可以有效防止隔离构件33与本体321发生相对转动；另一方面，凸部34通过凹部322对本体321施加朝向顶盖片31的压力，使得电极端子32的位置更加稳固。
同时参见图3、图5和图8所示，本实施例的电极端子32还包括外接段323。外接段323穿出隔离构件33，便于电极端子32通过外接段323与汇流排等外部构件电连接。本实施例的外接段323位于本体321的远离顶盖片31的一侧。在电极引出孔311的径向上，本体321凸出于外接段323的周向表面，也即外接段323沿厚度方向X的投影面积小于本体321沿厚度方向X的投影面积，从而隔离构件33的一部分和连接构件35的第一连接部351能够抵压于本体321凸出于外接段323的表面上。可选地，外接段323和本体321均为圆柱结构。
在一个实施例中，参见图9所示，第一连接部351为环状结构。中间过渡部352为筒状结构。第二连接部353为环状结构。隔离构件33为筒状结构，其包括的容纳腔331为孔状结构。这样，隔离构件33能够在本体321的周向上整体环绕本体321，两者之间的接触面积更大。同时在连接构件35的拉紧作用下，隔离构件33与本体321的周向表面接触更加紧实，提高两者之间的摩擦力，进一步降低隔离构件33与本体321发生相对转动的可能性。
参见图3和图10所示，本实施例的顶盖片31上具有凹槽312。连接构件35的第二连接部353容纳于凹槽312内。凹槽312具有第一平面312a和第一圆弧面312b。参见图9所示，本实施例的第二连接部353具有第二平面353a和第二圆弧面353b。第二连接部353与凹槽312配合后，第一平面312a和第二平面353a对接，而第一圆弧面312b与第二圆 弧面353b对接，从而阻止连接构件35相对于顶盖片31发生转动，提升了连接构件35和顶盖片31之间的连接稳定性。
本申请实施例的顶盖组件30，其包括相互连接的隔离构件33和电极端子32。隔离构件33通过凸部34与电极端子32上设置的凹部322相连接，以阻止隔离构件33和本体321之间发生相对转动，保证两者的相对位置不发生变化，从而保证隔离构件33和本体321的连接稳定性。同时，由于电极端子32的本体321的侧壁设置凹部322，而与该凹部322相配合的凸部34设置于隔离构件33的内壁，因此有利于降低凸部34对容纳腔331的径向尺寸的约束和限制，从而有利于增大隔离构件33的容纳腔331的径向尺寸，进而有利于增大电极端子32的本体321的径向尺寸，以此提高电极端子32整体的过流能力。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (11)

  1. 一种用于二次电池的顶盖组件，其中，包括：
    顶盖片，所述顶盖片具有电极引出孔；
    电极端子，所述电极端子覆盖所述电极引出孔，所述电极端子包括本体，所述本体的侧壁设有凹部；
    隔离构件，所述隔离构件具有容纳腔，所述本体容纳于所述容纳腔；
    凸部，所述凸部连接于所述隔离构件的内壁，并且朝靠近所述电极引出孔的轴线的方向延伸；
    其中，所述凸部容纳于所述凹部，以阻止所述本体相对于所述隔离构件旋转。
  2. 根据权利要求1所述的顶盖组件，其中，所述凹部沿厚度方向贯通所述本体。
  3. 根据权利要求1所述的顶盖组件，其中，所述本体为圆柱结构，所述本体的所述侧壁设有多个所述凹部，所述凸部的数量等于所述凹部的数量。
  4. 根据权利要求1所述的顶盖组件，其中，所述隔离构件和所述凸部为一体式结构并且材质相同。
  5. 根据权利要求1所述的顶盖组件，其中，所述电极端子还包括外接段，所述外接段位于所述本体远离所述顶盖片的一侧，所述本体凸出于所述外接段的周向表面。
  6. 根据权利要求1所述的顶盖组件，其中，所述隔离构件与所述本体接触，并且在厚度方向上，所述隔离构件的一部分位于所述本体远离所述顶盖片的一侧，以阻止所述本体朝远离所述顶盖片的方向运动。
  7. 根据权利要求1至6任一项所述的顶盖组件，其中，所述顶盖组件还包括连接构件，所述连接构件与所述顶盖片焊接，所述连接构件通过所述隔离构件与所述本体相连接，所述连接构件具有第一连接部，所述第一连接部位于所述本体远离所述顶盖片的一侧，并且部分所述隔离构件位于所述第一连接部和所述顶盖片之间。
  8. 根据权利要求7所述的顶盖组件，其中，所述连接构件还具有中间过渡部以及第二连接部，所述中间过渡部连接于所述第一连接部和所述第二连接部之间，所述第二连接部朝远离所述本体的方向延伸。
  9. 根据权利要求8所述的顶盖组件，其中，所述第一连接部为环状结构，所述中间过渡部为筒状结构，所述第二连接部为环状结构。
  10. 根据权利要求8所述的顶盖组件，其中，所述顶盖片具有凹槽，所述第二连接部容纳于所述凹槽内，所述凹槽具有第一平面与第一圆弧面，所述第二连接部具有第二平面与第二圆弧面，所述第一圆弧面与所述第二圆弧面配合，所述第一平面和所述第二平面连接以阻止所述连接构件相对于所述顶盖片旋转。
  11. 一种二次电池，其中，包括：
    壳体，具有开口；
    电极组件，容纳在所述壳体内；和，
    如权利要求1至10中任一项所述的顶盖组件，所述顶盖组件覆盖所述开口，以将所述电极组件封闭在所述壳体内。
PCT/CN2019/105714 2018-09-19 2019-09-12 顶盖组件以及二次电池 WO2020057442A1 (zh)

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