WO2024045065A1 - 端盖组件、电池组件、电池及用电设备 - Google Patents

端盖组件、电池组件、电池及用电设备 Download PDF

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Publication number
WO2024045065A1
WO2024045065A1 PCT/CN2022/116280 CN2022116280W WO2024045065A1 WO 2024045065 A1 WO2024045065 A1 WO 2024045065A1 CN 2022116280 W CN2022116280 W CN 2022116280W WO 2024045065 A1 WO2024045065 A1 WO 2024045065A1
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WO
WIPO (PCT)
Prior art keywords
mounting hole
end cap
seal
along
axial direction
Prior art date
Application number
PCT/CN2022/116280
Other languages
English (en)
French (fr)
Inventor
陈新祥
郑于炼
黄守君
林蹬华
陈龙
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.)
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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 PCT/CN2022/116280 priority Critical patent/WO2024045065A1/zh
Publication of WO2024045065A1 publication Critical patent/WO2024045065A1/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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape 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
    • H01M50/10—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

Definitions

  • the present application relates to the field of battery technology, specifically, to an end cover assembly, a battery assembly, a battery and electrical equipment.
  • lithium-ion batteries As a rechargeable battery, lithium-ion batteries have the advantages of small size, high energy density, high power density, many cycles and long storage time.
  • the battery cell includes an end cap assembly, a casing and an electrode assembly.
  • the end cap covers the opening of the casing to form a shell housing the electrode assembly.
  • the sealing performance of the casing is crucial to the safety performance of the battery. Therefore, how to improve the sealing performance of the casing has become an urgent problem to be solved in the field of battery technology.
  • Embodiments of the present application provide an end cap assembly, a battery assembly, a battery and electrical equipment to improve the sealing performance of the battery.
  • embodiments of the present application provide an end cap assembly, including a composite end cap, an electrode terminal and a seal; the composite end cap is provided with a mounting hole penetrating the composite end cap, and the composite end cap includes an edge along the
  • the mounting hole has a first end cap and a second end cap arranged in an axial stack.
  • the first end cap is used to cover the opening of the first shell and the second end cap is used to cover the second shell.
  • the opening of the body, the mounting hole penetrates the first end cover and the second end cover; the electrode terminal passes through the mounting hole; at least part of the sealing member is located in the mounting hole, and The hole wall of the mounting hole and the electrode terminal clamp at least a part of the sealing member.
  • At least part of the seal is located in the mounting hole, and the hole wall of the mounting hole and the electrode terminal clamp the part of the seal located in the mounting hole, then along the radial direction of the mounting hole, the holes of the electrode terminal and the mounting hole
  • the wall cooperates with a compression seal to seal the electrode terminal and the composite end cap, i.e. the seal forms a radial seal between the mounting hole and the electrode terminal, compared to the seal being compressed in the axial direction of the mounting hole so that it is compressed in the axial direction of the mounting hole.
  • the sealing method of sealing the first end cap and the electrode terminal upward and/or sealing the second end cap and the electrode terminal in the axial direction of the mounting hole.
  • the sealing method of this solution has better sealing performance and sealing reliability.
  • the method is simpler and more convenient.
  • the radial sealing of the seal relative to the axial sealing of the seal along the mounting hole can reduce the axial size of the end cover assembly along the mounting hole, thereby helping to increase the energy of the battery pack and battery with the end cover assembly. density.
  • the mounting hole includes a first mounting hole provided in the first end cap; at least part of the seal is located in the first mounting hole, and the The hole wall of the first mounting hole and the electrode terminal clamp the portion of the seal located in the first mounting hole.
  • At least part of the sealing member is located in the first mounting hole, and the part of the sealing member located in the first mounting hole is clamped by the hole wall and the electrode terminal of the first mounting hole, then the sealing member is in the first mounting hole.
  • a radial seal is formed between it and the electrode terminal, which has good sealing performance and high sealing reliability.
  • the seal along the axial direction of the mounting hole, the seal has a first end face, and the first end face is located in the first mounting hole.
  • the first end face of the seal located in the axial direction of the mounting hole is located in the first mounting hole. Then, along the axial direction of the mounting hole, there may be a first gap between the first end face and one end of the first mounting hole. , the first gap allows the seal to deform along the axial direction of the mounting hole when it is clamped by the hole wall of the first mounting hole and the electrode terminal, so that the hole wall of the first mounting hole and the electrode terminal can cause the seal to produce Sufficient amount of compression to ensure sealing performance between the first end cap and the electrode terminal.
  • the size of the portion of the seal located in the first mounting hole is a, and the size of the first mounting hole is b. , where a/b>1/2.
  • the size of the portion of the seal located in the first mounting hole along the axial direction of the mounting hole is greater than half of the axial size of the first mounting hole, so that the contact area between the seal and the hole wall of the first mounting hole is sufficient. large, thereby improving the radial sealing performance of the seal to the first end cap and the electrode terminal.
  • the mounting hole further includes a second mounting hole provided in the second end cap; a portion of the seal is located in the first mounting hole, and the seal A portion of the sealing member is located in the second mounting hole, and the hole wall of the second mounting hole and the electrode terminal clamp the portion of the sealing member located in the second mounting hole.
  • a part of the sealing member is located in the first mounting hole to seal the first end cover and the electrode terminal along the radial direction of the first mounting hole, and a part of the sealing member is located in the second mounting hole and is used along the radial direction of the second mounting hole.
  • the seal has a second end face along the axial direction of the mounting hole, and the second end face is located in the second mounting hole.
  • the second end face of the seal located in the axial direction of the mounting hole is located in the second mounting hole. Then, along the axial direction of the mounting hole, there is a second gap between the second end face and one end of the second mounting hole.
  • the second gap allows the seal to be deformed along the axial direction of the mounting hole when it is clamped by the hole wall of the second mounting hole and the electrode terminal, so that the hole wall and electrode terminal of the second mounting hole can cause the seal to produce sufficient
  • the amount of compression ensures the sealing performance between the second end cap and the electrode terminal.
  • the size of the portion of the seal located in the second mounting hole is h, and the size of the second mounting hole is k , where h/k>1/2.
  • the size of the portion of the seal located in the second mounting hole along the axial direction of the mounting hole is greater than half of the axial size of the second mounting hole, so that the contact area between the seal and the hole wall of the second mounting hole is sufficient. large, thereby improving the radial sealing performance of the seal against the second end cap and the electrode terminal.
  • the dimension of the first mounting hole along its axial direction is b, b ⁇ 0.5 mm; and/or the dimension of the second mounting hole along its axial direction is k. ,k ⁇ 0.5mm.
  • the size b of the first mounting hole along its axial direction is ⁇ 0.5mm, so that the first mounting hole has sufficient area along its axial direction to contact the seal, thereby ensuring that the seal is in the first mounting hole. Sealing performance between the hole wall and the electrode terminal; the size of the second mounting hole along its axial direction k ⁇ 0.5mm, so that the second mounting hole has sufficient area along its axial direction to contact the seal, thereby ensuring that the seal Sealing performance between the hole wall of the second mounting hole and the electrode terminal.
  • 1.2mm ⁇ b ⁇ 2.5mm; and/or 1.2mm ⁇ k ⁇ 2.5mm In some embodiments of the first aspect of the application, 1.2mm ⁇ b ⁇ 2.5mm; and/or 1.2mm ⁇ k ⁇ 2.5mm.
  • the dimension b of the first mounting hole along its axial direction satisfies 1.2mm ⁇ b ⁇ 2.5mm, which can ensure that the first mounting hole has sufficient area along its axial direction to contact the seal, thus ensuring that the seal
  • the sealing performance between the hole wall of the first mounting hole and the electrode terminal can control the axial size of the first end cover along the first mounting hole within a reasonable range, thereby preventing the end cover assembly from being along the first mounting hole.
  • the axial size of the hole is too large; and/or, the axial size k of the second mounting hole along its axial direction satisfies 1.2mm ⁇ k ⁇ 2.5mm, which can ensure that the second mounting hole has sufficient area along its axial direction.
  • the seal is in contact, thereby ensuring the sealing performance between the hole wall of the second mounting hole and the electrode terminal, and controlling the axial size of the second end cap along the second mounting hole within a reasonable range, thereby Avoid oversizing the end cap assembly along the axial direction of the second mounting hole.
  • the sealing member includes a body part and a limiting part, and the limiting part is protruding from the outer peripheral surface of the body part, along the radial direction of the mounting hole, so The limiting portion extends at least partially between the first end cap and the second end cap.
  • the limiting part is used to limit the axial position of the body part along the mounting hole, so as to reduce the axial movement of the seal in the mounting hole or to prevent the seal from moving in the axial direction of the mounting hole, thereby Reduce the risk of seal failure.
  • the limiting portion continuously surrounds the outer periphery of the body portion.
  • the limiting part continuously surrounds the outer periphery of the body part, and can limit the position of the body part in the axial direction of the mounting hole at any position in the circumferential direction of the body part, thereby improving the sealing element relative to the first end cover and the second end cap. Stability of end caps and electrode terminals, reducing the risk of seal failure.
  • the first end cap and the second end cap clamp the limiting part along the axial direction of the mounting hole.
  • the composite end cover further includes a first insulating member, which is stacked on the first end cover and the first insulating member along the axial direction of the mounting hole. Between the second end caps, the mounting hole penetrates the first end cap, the second end cap and the first insulating member; the mounting hole also includes a third insulating member provided on the first insulating member. Three mounting holes.
  • the provision of the first insulator can prevent the battery pack and the battery with the end cover assembly from being short-circuited due to the contact between the first end cover and the second end cover, and improve the safety of the battery pack and the battery with the end cover assembly. safety.
  • the sealing member includes a body part and a limiting part, and the limiting part is protruding from the outer peripheral surface of the body part, along the radial direction of the mounting hole, so The limiting part extends at least partially between the first end cap and the second end cap, and the limiting part is located in the third mounting hole.
  • the limiting portion is located in the third mounting hole and extends along the radial direction of the mounting hole to between the first end cover and the second end cover.
  • the limiting portion can limit the axial position of the body portion along the mounting hole. , to reduce the axial movement of the seal in the mounting hole or to prevent the seal from moving in the axial direction of the mounting hole, thereby reducing the risk of seal failure.
  • the aperture of the third mounting hole is larger than that of the first mounting hole, the aperture of the third mounting hole is larger than the aperture of the second mounting hole, and the limiting The portion protrudes from the hole wall of the first mounting hole and the hole wall of the second mounting hole along the radial direction of the mounting hole.
  • the limiting portion protrudes from the hole wall of the first mounting hole and the hole wall of the second mounting hole along the radial direction of the mounting hole. Therefore, along the axial direction of the mounting hole, the two ends of the limiting portion can respectively It offsets the first end cap and the second end cap, thereby limiting the seal in the axial direction of the installation hole, thereby reducing the risk of seal failure.
  • the minimum thickness of the portion of the seal located in the mounting hole is e, satisfying 0.5 mm ⁇ e ⁇ 3 mm.
  • the minimum thickness e of the part of the seal located in the installation hole satisfies 0.5mm ⁇ e ⁇ 3mm, which facilitates the control of the compression amount of the seal along the radial direction of the installation hole, thereby improving the stability of the seal.
  • the electrode terminal includes a terminal body, the terminal body passes through the mounting hole, and the sealing member is sleeved on the outer periphery of the terminal body.
  • the terminal body is inserted into the mounting hole so that the composite end cover and the electrode terminal form a positioning fit, thereby improving the relative stability of the electrode terminal, the first end cover and the second end cover.
  • the sealing member is sleeved on the outer periphery of the terminal body and can form a positioning fit with the electrode terminal to improve installation stability and achieve a stable sealing effect.
  • the electrode terminal further includes a first connection part and a second connection part, both of the first connection part and the second connection part protrude from the terminal body.
  • the first connection part is provided on a side of the first end cap facing away from the second end cap
  • the second connection part is provided on a side of the second end cap facing away from the first end cap. side.
  • the first connection part and the second connection part are both connected to the terminal body, and are respectively located on the side of the first end cap facing away from the second end cap and the side of the second end cap facing away from the first end cap, which can It plays a limiting role to make the structure of the end cover assembly more compact and improve the structural stability of the end cover assembly.
  • the composite end cap further includes a second insulating member and a third insulating member, at least part of the second insulating member is located at the third connecting portion and the first between the end caps to insulate the first connection part and the first end cap, and at least part of the third insulating member is located between the second connection part and the second end cap to insulate Isolate the second connection part and the second end cap.
  • the provision of the second insulating member and the third insulating member can reduce the risk of short circuit between the battery assembly and the battery having the end cover assembly.
  • embodiments of the present application also provide a battery assembly, including a first housing, a second housing, and an end cover assembly according to any embodiment of the first aspect; the first housing is used to accommodate a first electrode assembly. ; The second housing is used to accommodate the second electrode assembly; the first end cover covers the opening of the first housing, and the second end cover covers the opening of the second housing, so The electrode terminal is used to electrically connect the first electrode assembly and the second electrode assembly.
  • the end cover assembly provided by the first embodiment has better sealing performance. Therefore, the sealing performance of the battery assembly equipped with the end cover assembly is also better, reducing the risk of battery assembly leakage from the end cover assembly. .
  • embodiments of the present application provide a battery, including a battery assembly provided in the embodiment of the second aspect.
  • an embodiment of the present application provides an electrical device, including the battery provided in an embodiment of the third aspect.
  • Figure 1 is a schematic structural diagram of a battery assembly in the prior art
  • Figure 2 is a cross-sectional view of the end cap assembly in the prior art
  • Figure 3 is an enlarged view of point A in Figure 2;
  • Figure 4 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Figure 5 is a schematic structural diagram of a battery provided by some embodiments of the present application.
  • Figure 6 is a schematic structural diagram of a battery assembly provided by some embodiments of the present application.
  • Figure 7 is an exploded view of a battery assembly provided by some embodiments of the present application.
  • Figure 8 is an exploded view of an end cap assembly provided by some embodiments of the present application.
  • Figure 9 is a schematic structural diagram of an end cap assembly provided by some embodiments of the present application.
  • Figure 10 is a cross-sectional view of an end cap assembly provided by some embodiments of the present application.
  • Figure 11 is a cross-sectional view at B in Figure 10;
  • Figure 12 is a cross-sectional view of an end cap assembly provided by other embodiments of the present application.
  • Figure 13 is an enlarged view of C in Figure 12;
  • Figure 14 is a cross-sectional view of an end cap assembly provided by some embodiments of the present application.
  • Figure 15 is an enlarged view of D in Figure 14;
  • Figure 16 is a cross-sectional view of an end cap assembly provided by some further embodiments of the present application.
  • Figure 17 is an enlarged view of E in Figure 16;
  • Figure 18 is a cross-sectional view of an end cap assembly provided by other embodiments of the present application.
  • Figure 19 is an enlarged view of F in Figure 18;
  • Figure 20 is a cross-sectional view of an end cap assembly provided by still some embodiments of the present application.
  • Figure 21 is an enlarged view of G in Figure 20;
  • Figure 22 is a schematic structural diagram of a seal provided by some embodiments of the present application.
  • Figure 23 is a schematic structural diagram of a seal provided by other embodiments of the present application.
  • Figure 24 is a schematic structural diagram of a seal provided by some embodiments of the present application.
  • Figure 25 is a schematic structural diagram of an electrode terminal provided by some embodiments of the present application.
  • Figure 26 is a schematic structural diagram of the first insulating member provided by some embodiments of the present application.
  • Figure 27 is a schematic structural diagram of a second insulating member provided by some embodiments of the present application.
  • Icon 1000-vehicle; 100-battery; 10-box; 11-first box; 12-second box; 20', 20-battery assembly; 21', 21-first case; 211-th An opening; 22', 22-second housing; 221-second opening; 23', 23-first electrode assembly; 231-positive electrode lug; 24', 24-second electrode assembly; 241-negative electrode lug; 25 ', 25-end cover assembly; 250-composite end cover; 2500-mounting hole; 251', 251-first end cover; 2511-first mounting hole; 2512-first surface; 2513-third surface; 252' , 252-second end cap; 2521-second mounting hole; 2522-second surface; 2523-fourth surface; 253', 253-electrode terminal; 2531', 2531-terminal body; 25311-first section; 25312 -The second section; 25313-the first main body part; 25314-the first socket part; 25315-the second main part; 25316
  • the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this application is commonly placed when used, or the orientation or positional relationship of this application.
  • the orientation or positional relationship commonly understood by those skilled in the art is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.
  • the terms “first”, “second”, “third”, etc. are only used to distinguish descriptions and shall not be understood as indicating or implying relative importance.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • multiple battery cells can be connected in series through the bus component.
  • two wires can be drawn from the outside of the battery to connect the positive transmission pole of the battery (multiple battery cells) respectively.
  • the positive electrode terminal of one of the battery cells) and the negative transfer electrode (the negative electrode terminal of one of the multiple battery cells) cooperate with the circuit board to collect battery-related information (such as voltage information).
  • This series-connected bus component occupies a large space, making the energy density of the battery low.
  • the battery assembly 20 includes a first housing 21 ′, a second housing 22 ′, a first electrode assembly 23 ′, a second electrode assembly 24 ′ and an end cap assembly 25 ′. .
  • the end cap assembly 25' includes a first end cap 251', a second end cap 252', an electrode terminal 253', a seal 254', a first insulator 257', a second insulator 258' and a third insulator 259'.
  • the electrode terminal 253' includes a terminal body 2531', a first connection part 2532' and a second connection part 2533'.
  • the second insulating member 258', the first end cover 251', the first insulating member 257', the second end cover 252' and the third insulating member 259' are sequentially stacked along the first direction X.
  • the first end cap 251' and the second end cap 252' are respectively used to cover the opening of the first housing 21' and the opening of the second housing 22'.
  • the first connection part 2532' and the second connection part 2533' are both connected to the terminal body 2531'.
  • the terminal body 2531' is penetrated through the second insulating member 258', the first end cover 251', the first insulating member 257', and the second insulating member 253'.
  • the first connecting portion 2532' is located on the side of the second insulating member 258' away from the first end cover 251'.
  • the second insulating member 258' insulates and separates the first connecting portion 2532' and the first end cover 251'.
  • the second connecting portion 2533' is located on the side of the third insulating member 259' away from the first end cover 251', and the third insulating member 259' insulates and separates the second connection portion 2533' and the second end cover 252'.
  • the portion is sealed between the first connecting portion 2532' and the first end cap 251' in the first direction X.
  • the part is sealed between the second connection part 2533' and the second end cover 252' in the first direction
  • the first end cap 251' and the electrode terminal 253' are sealed, and the second end cap 252' and the electrode terminal 253' are sealed.
  • This sealing method is not only complex to assemble, but also has poor sealing performance and sealing reliability. It also makes the size of the electrode assembly along the first direction X larger, making the energy density of the battery pack and battery equipped with the end cover assembly 25' lower.
  • the end cover assembly includes a composite end cover, an electrode terminal and a seal.
  • the composite end cover has a through-composite The mounting hole of the end cover.
  • the composite end cover includes a first end cover and a second end cover that are stacked along the axial direction of the mounting hole.
  • the mounting hole penetrates the first end cover and the second end cover, and the electrode terminal is passed through the mounting hole; At least part of the sealing member is located in the mounting hole, and at least part of the sealing member is clamped by the hole wall of the mounting hole and the electrode terminal.
  • At least part of the seal is located in the mounting hole, and the hole wall of the mounting hole and the electrode terminal clamp the portion of the seal located in the mounting hole, then along the radial direction of the mounting hole, the electrode terminal and the wall of the mounting hole cooperate to compress the sealing member
  • the seal forms a radial seal between the mounting hole and the electrode terminal.
  • the sealing method of sealing one end cover and the electrode terminal and/or sealing the second end cover and the electrode terminal in the axial direction of the mounting hole has better sealing performance and sealing reliability, and the sealing method is simpler and more convenient. .
  • the radial sealing of the seal relative to the axial sealing of the seal along the mounting hole can reduce the axial size of the end cover assembly along the mounting hole, thereby helping to increase the energy of the battery pack and battery with the end cover assembly. density.
  • the end cover assembly disclosed in the embodiment of the present application can be used in a battery assembly or battery equipped with the end cover assembly, and can also be used in electrical equipment of a power supply system composed of a battery assembly or battery equipped with the end cover assembly. In this way , it is convenient to obtain battery-related information, so as to facilitate monitoring of the power consumption of electrical equipment.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • an electrical device is a vehicle 1000 as an example.
  • FIG. 4 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 .
  • the battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 .
  • the vehicle 1000 may also include a controller 200 and a motor 300 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • FIG. 5 is an exploded view of the battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a case 10 and at least one battery assembly 20 , and the battery assembly 20 is accommodated in the case 10 .
  • the box 10 is used to provide a receiving space for the battery assembly 20, and the box 10 can adopt a variety of structures.
  • the box 10 may include a first box 11 and a second box 12.
  • the first box 11 and the second box 12 cover each other, and the first box 11 and the second box 12 share a common
  • An accommodation space for accommodating the battery assembly 20 is defined.
  • the second box body 12 may be a hollow structure with one end open to form a receiving cavity for accommodating the battery assembly 20.
  • the first box body 11 may be a plate-like structure, and the first box body 11 covers the open side of the second box body 12. So that the first box 11 and the second box 12 jointly define an accommodation space; the first box 11 and the second box 12 can also be hollow with one side open to form an accommodation cavity for accommodating the battery assembly 20 Structure, the opening side of the first box 11 is covered with the opening side of the second box 12 .
  • the box 10 formed by the first box 11 and the second box 12 can be in various shapes, such as a cylinder, a rectangular parallelepiped, etc.
  • the battery assembly 20 includes a first housing 21 , a second housing 22 , a first electrode assembly 23 , a second electrode assembly 24 and an end cap assembly 25 .
  • the first housing 21 has a first opening 211 and the second housing 22 has a second opening 221.
  • the end cover assembly 25 covers the first opening 211 and the second opening 221.
  • the end cover assembly 25 and the first housing 21 define a A space for accommodating the first electrode assembly 23
  • the end cap assembly 25 and the second housing 22 define a space for accommodating the second electrode assembly 24 .
  • the first housing 21 and the second housing 22 may be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shapes of the first housing 21 and the second housing 22 can be determined according to the specific shape and size of the electrode assembly. The shapes of the first housing 21 and the second housing 22 may be the same or different.
  • the first housing 21 and the second housing 22 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the first electrode assembly 23 and the second electrode assembly 24 are both composed of a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure) and a separation film (not shown in the figure).
  • the battery assembly 20 mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the positive electrode current collector that is not coated with the positive electrode active material layer protrudes from the positive electrode current collector that is coated with the positive electrode active material layer.
  • the positive electrode current collector without coating the positive electrode active material layer is used as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganate, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the negative electrode current collector that is not coated with the negative electrode active material layer protrudes from the negative electrode current collector that is coated with the negative electrode active material layer.
  • the negative electrode current collector that is not coated with the negative electrode active material layer is used as the negative electrode tab.
  • the material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the first electrode assembly 23 and the second electrode assembly 24 may be of a rolled structure or a laminated structure; one of the first electrode components 23 may be of a rolled structure and the other may be a laminated structure. formula structure. The embodiments of the present application are not limited to this.
  • the end cap assembly 25 is used to electrically connect the first electrode assembly 23 and the second electrode assembly 24 .
  • the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24 may be electrically connected through the end cover assembly 25 to realize the electrical connection between the first electrode assembly 23 and the second electrode assembly 24; it may also be The negative electrode tab of the first electrode assembly 23 and the positive electrode tab of the second electrode assembly 24 are electrically connected through the end cover assembly 25 to realize the electrical connection between the first electrode assembly 23 and the second electrode assembly 24; it can also be The negative electrode tab and the negative electrode tab of the second electrode assembly 24 are electrically connected through the end cap assembly 25 to realize the electrical connection between the first electrode assembly 23 and the second electrode assembly 24 .
  • the battery component 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
  • the first electrode assembly 23 and the second electrode assembly 24 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.
  • the first housing 21 and the second housing 22 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.
  • the end cover assembly 25 includes a composite end cover 250, an electrode terminal 253 and a seal 254; the composite end cover 250 is provided with a mounting hole 2500 that penetrates the composite end cover 250, and the composite end cover 250 includes a
  • the first end cap 251 and the second end cap 252 are stacked in the axial direction Y of the hole.
  • the first end cap 251 is used to cover the opening of the first housing 21 and the second end cap 252 is used to cover the second housing.
  • the mounting hole 2500 penetrates the first end cover 251 and the second end cover 252; the electrode terminal 253 is provided in the mounting hole 2500; at least part of the seal 254 is located in the mounting hole 2500, and the hole wall of the mounting hole 2500 is in contact with the mounting hole 2500.
  • the electrode terminal 253 holds at least a portion of the seal 254 .
  • the opening of the first housing 21 is a first opening 211
  • the opening of the second housing 22 is a second opening 221 .
  • the first end cap 251 covers the first opening 211
  • the first end cap 251 and the first housing 21 jointly define a first space for accommodating the first electrode assembly 23 .
  • the second end cap 252 covers the second opening 221 , and the second end cap 252 and the second housing 22 jointly define a second space for accommodating the second electrode assembly 24 .
  • the first space and the second space can also accommodate electrolyte and other components.
  • the shape of the first end cover 251 can be adapted to the shape of the first housing 21 or the shape of the first opening 211 of the first housing 21 to match the shapes of the first housing 21 and the second end cover 252. It can be adapted to the shape of the second housing 22 or the shape of the second opening 221 of the second housing 22 to fit the second housing 22 .
  • the first end cap 251 and the second end cap 252 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the first end cap 251 and the second end cap 252 are not damaged when they are extruded and collided. The battery component 20 is less likely to be deformed when used, so that the battery component 20 can have higher structural strength, and the safety performance can also be improved.
  • the first end cap 251 and the second end cap 252 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the first end cap 251 and the second end cap 252 can be insulated and separated to reduce the short circuit of the battery assembly 20 or the battery 100 caused by the contact between the first end cap 251 and the second end cap 252 .
  • an insulator can be provided between the first end cover 251 and the second end cover 252 to insulate and separate the first end cover 251 and the second end cover 252; the first end cover 251 and/or the second end cover can also be insulated.
  • the cover 252 itself is made of insulating material, thereby achieving insulating separation between the first end cover 251 and the second end cover 252 .
  • Seals 254 plastic, rubber, etc.
  • the seal 254 may be located within the mounting hole 2500 along only a portion thereof, while the other portion extends out of the mounting hole 2500 .
  • the seal 254 may also be entirely located within the mounting hole 2500.
  • the portion of the sealing member 254 located in the mounting hole 2500 may completely function as a seal, or may only partially function as a seal.
  • At least part of the seal 254 is located in the mounting hole 2500, and the hole wall of the mounting hole 2500 and the electrode terminal 253 clamp the portion of the seal 254 located in the mounting hole 2500, then along the radial direction of the mounting hole 2500, the electrode terminal 253 and the mounting
  • the hole wall of the hole 2500 cooperates with the compression seal 254 to seal the electrode terminal 253 and the first end cover 251. That is, the seal 254 forms a radial seal between the mounting hole 2500 and the electrode terminal 253.
  • the sealing method of this solution has better sealing performance and sealing reliability, and the sealing method is simpler and more convenient.
  • the radial sealing of the sealing member 254 relative to the sealing of the sealing member 254 along the axial direction Y of the mounting hole can reduce the size of the end cover assembly 25 along the axial direction Y of the mounting hole, thereby conducive to improving the performance of the end cover assembly 25.
  • the mounting hole 2500 includes a first mounting hole 2511 provided in the first end cover 251; at least part of the seal 254 is located in the first mounting hole 2511, and the first The hole wall of the mounting hole 2511 and the electrode terminal 253 sandwich the portion of the seal 254 located in the first mounting hole 2511.
  • the seal 254 may be entirely located within the first mounting hole 2511.
  • the seal 254 may only be partially located in the first mounting hole 2511, and the other portion extends out of the first mounting hole 2511 and out of the mounting hole 2500.
  • the sealing member 254 may also be partially located in the first mounting hole 2511 and partially extended to other locations in the mounting hole 2500 .
  • the sealing member 254 may be entirely located in the first mounting hole 2511 . As shown in FIGS. 14 to 17 , the seal 254 may be located in the first mounting hole 2511 along a portion of the axial direction Y of the mounting hole.
  • At least part of the sealing member 254 is located in the first mounting hole 2511, and the portion of the sealing member 254 located in the first mounting hole 2511 is clamped by the hole wall of the first mounting hole 2511 and the electrode terminal 253, then the sealing member 254 is in the first mounting hole 2511.
  • a radial seal is formed between the mounting hole 2511 and the electrode terminal 253. The sealing performance is good and the sealing reliability is high, which can reduce the leakage of liquid from the first mounting hole 2511 in the first space formed by the first end cover 251 and the first housing 21. risks of.
  • the seal 254 has a first end surface 2541 , and the first end surface 2541 is located in the first mounting hole 2511 .
  • the first end cap 251 has a first surface 2512 facing away from the second end cap 252.
  • the first end face 2541 is the surface of the seal 254 located in the first mounting hole 2511 and facing away from the second end cap 252. , the first end surface 2541 is closer to the second end cap 252 than the first surface 2512.
  • the first end surface 2541 is closer to the second end cover 252 than the first surface 2512, and the first end surface 2541 is located in the first mounting hole 2511, then along the axial direction Y of the mounting hole, the distance between the first end surface 2541 and the first surface 2512 A first gap 255 is formed.
  • the first gap 255 allows the seal 254 to be sandwiched by the hole wall of the first mounting hole 2511 and the electrode terminal 253.
  • the first end cap 251 also has a third surface 2513, and the third surface 2513 and the first surface 2512 are arranged oppositely in the axial direction Y of the mounting hole.
  • the seal 254 also has a third end surface 2542, and the third end surface 2542 and the first end surface 2541 are arranged oppositely in the axial direction Y of the installation hole. As shown in FIG. 11 , the third end surface 2542 may be coplanar with the third surface 2513 .
  • the third end surface 2542 and the third surface 2513 may not be coplanar, that is, as shown in Figure 13, along the axial direction Y of the mounting hole, the third end surface 2542 is closer to the first surface 2512 than the third surface 2513, then the third end surface 2542 is located in the first mounting hole 2511, and along the axial direction Y of the mounting hole, a gap is formed between the third end surface 2542 and the third surface 2513.
  • the gap allows the seal 254 to deform along the axial direction Y of the mounting hole, so that the hole wall of the first mounting hole 2511 and the electrode terminal 253 can Enable sufficient compression of the sealing member 254 to ensure the sealing performance between the first end cover 251 and the electrode terminal 253.
  • the sealing member 254 is entirely located in the first mounting hole 2511; or, as shown in Figure 15 , along the axial direction Y of the mounting hole, the third end surface 2542 is further away from the first surface 2512 than the third surface 2513, that is, the seal 254 extends out of the first mounting hole 2511 in the direction close to the second end cover 252. In this case , a part of the sealing member 254 is located in the first mounting hole 2511.
  • the seal 254 may extend from both ends of the first mounting hole 2511 along the axial direction Y of the mounting hole.
  • the size of the portion of the seal 254 located in the first mounting hole 2511 is a, and the first mounting hole The size of 2511 is b, where a/b>1/2.
  • the "dimension a of the portion of the seal 254 located in the first mounting hole 2511" refers to the dimension a along the mounting hole. In the axial direction Y, the distance between the first end surface 2541 and the third end surface 2542.
  • the first mounting hole 2511 penetrates the first surface 2512 and the third surface 2513 of the first end cover 251 .
  • “Dimension b of the first mounting hole 2511" refers to the distance between the first surface 2512 and the third surface 2513 along the axial direction Y of the mounting hole.
  • the size a of the portion of the seal 254 located in the first mounting hole 2511 and the size b of the first mounting hole 2511 satisfy: a/b>1/2, that is, the portion of the seal 254 located in the first mounting hole 2511 is along the length of the mounting hole.
  • the axial Y dimension is greater than half of the axial dimension of the first mounting hole 2511, so that the contact area between the seal 254 and the hole wall of the first mounting hole 2511 is large enough, thereby improving the seal 254's effect on the first end cover 251 and the first end cap 251. Radial sealing performance of the electrode terminal 253.
  • the mounting hole 2500 also includes a second mounting hole 2521 provided in the second end cover 252; part of the seal 254 is located in the first mounting hole 2511. A portion of the seal 254 is located within the second mounting hole 2521 , and the hole wall of the second mounting hole 2521 and the electrode terminal 253 sandwich the portion of the seal 254 located within the second mounting hole 2521 .
  • the portion of the seal 254 located in the second mounting hole 2521 and the portion of the seal 254 located in the first mounting hole 2511 may be connected, or may be unconnected and independent of each other.
  • FIG. 17 shows a state where the portion of the seal 254 located in the second mounting hole 2521 and the portion of the seal 254 located in the first mounting hole 2511 are connected.
  • FIG. 19 shows a situation where the portion of the seal 254 located in the second mounting hole 2521 and the portion of the seal 254 located in the first mounting hole 2511 are not connected and are independent of each other.
  • the electrode terminal 253 includes a terminal body 2531 that penetrates the first mounting hole 2511 and the second mounting hole 2521 .
  • the portion of the seal 254 located in the first mounting hole 2511 is compressed by the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531 along the radial direction of the first mounting hole 2511 to realize the radial sealing of the electrode terminal by the seal 254 253 and first end cap 251.
  • the radial size of the portion of the seal 254 located in the first mounting hole 2511 along the first mounting hole 2511 is relatively smaller than the radial size before the seal 254 is located in the first mounting hole 2511 .
  • the portion of the seal 254 located in the second mounting hole 2521 is cooperatively compressed by the hole wall of the second mounting hole 2521 and the outer peripheral surface of the terminal body 2531 along the radial direction of the second mounting hole 2521 to achieve radial sealing of the electrode terminal by the seal 254 253 and second end cap 252.
  • the radial size of the portion of the seal 254 located in the second mounting hole 2521 along the second mounting hole 2521 is relatively smaller than the radial size before the seal 254 is located in the second mounting hole 2521 .
  • a part of the sealing member 254 is located in the first mounting hole 2511 to seal the first end cap 251 and the electrode terminal 253 along the radial direction of the first mounting hole 2511.
  • a part of the sealing member 254 is located in the second mounting hole 2521 and is located along the radial direction of the first mounting hole 2511.
  • the two mounting holes 2521 radially seal the electrode terminal 253 and the second end cap 252, so that the sealing performance between the first end cap 251 and the electrode terminal 253 is better and the sealing reliability is higher, and the second end cap 252 and the electrode The sealing performance between the terminals 253 is better and the sealing reliability is higher, thereby improving the sealing performance of the end cover assembly 25 .
  • the seal 254 has a second end surface 2543, and the second end surface 2543 is located in the second mounting hole 2521.
  • the second end cap 252 has a second surface 2522 facing away from the first end cap 251.
  • the second end face 2543 is a surface of the seal 254 located in the second mounting hole 2521 and facing away from the first end cap 251.
  • the second end face 2543 is smaller than the first end cap 252.
  • the second surface 2522 is closer to the first end cap 251 .
  • the second end surface 2543 is closer to the first end cover 251 than the second surface 2522, and the second end surface 2543 is located in the second mounting hole 2521, then along the axial direction Y of the mounting hole, there is a gap between the second end surface 2543 and the second surface 2522.
  • a second gap 256 is formed.
  • the second end cap 252 also has a fourth surface 2523, and the fourth surface 2523 and the second surface 2522 are arranged oppositely in the axial direction Y of the mounting hole.
  • the seal 254 is installed in the first mounting hole 2511
  • the inner part is the first part 2544, and the first end surface 2541 and the third end surface 2542 are respectively the two opposite end surfaces of the first part 2544 along the axial direction Y of the mounting hole.
  • the part of the seal 254 installed in the second mounting hole 2521 is defined as the second part 2545, the second end face 2543 is an end face of the second part 2545, the second part 2545 also has a fourth end face 2546, and the fourth end face 2546 is installed along The axial direction Y of the hole is arranged opposite to the second end surface 2543 .
  • the fourth end surface 2546 may be coplanar with the fourth surface 2523. In other embodiments, the fourth end surface 2546 and the fourth surface 2523 may not be coplanar, that is, along the axial direction Y of the mounting hole, the fourth end surface 2546 is closer to the second surface 2522 than the fourth surface 2523, then the fourth end surface 2546 is closer to the second surface 2522 than the fourth surface 2523.
  • the four end faces 2546 are located in the second mounting hole 2521, and along the axial direction Y of the mounting hole, a gap is formed between the fourth end face 2546 and the fourth surface 2523.
  • the hole wall of the second mounting hole 2521 and the electrode terminal 253 cooperate with the compression seal
  • the gap allows the seal 254 to deform along the axial direction Y of the mounting hole while being clamped by the hole wall of the second mounting hole 2521 and the electrode terminal 253, so that the hole wall of the second mounting hole 2521 and The electrode terminal 253 can cause the seal 254 to generate sufficient compression to ensure the sealing performance between the second end cover 252 and the electrode terminal 253; or, along the axial direction Y of the mounting hole, the fourth end surface 2546 is smaller than the fourth surface 2523 Further away from the second surface 2522 , that is, the seal 254 extends out of the second mounting hole 2521 in a direction close to the first end cap 251 .
  • FIG. 19 shows a situation where the fourth end surface 2546 and the fourth surface 25
  • the second mounting holes 2521 may extend from both ends of the second portion 2545 along the axial direction Y of the mounting hole.
  • the size of the portion of the seal 254 located in the second mounting hole 2521 is h, and the size of the second mounting hole 2521 is k, Among them, h/k>1/2.
  • the "seal" The size of the part of 254 located in the second mounting hole 2521 is h”, which refers to the distance between the second end face 2543 and the fourth end face 2546 along the axial direction Y of the mounting hole; only a part of the second part 2545 is located in the second
  • the size of the portion of the seal 254 located in the second mounting hole 2521 is h” refers to the axial direction Y along the mounting hole, The distance between the second end surface 2543 and the fourth surface 2523.
  • the second mounting hole 2521 penetrates the second surface 2522 and the fourth surface 2523 of the second end cap 252 .
  • Dission k of the second mounting hole 2521 refers to the distance between the second surface 2522 and the fourth surface 2523 along the axial direction Y of the mounting hole.
  • the size h of the portion of the seal 254 located in the second mounting hole 2521 and the size k of the first mounting hole 2511 satisfy: h/k>1/2, that is, the portion of the seal 254 located in the second mounting hole 2521 is along the length of the mounting hole.
  • the axial Y dimension is greater than half of the axial dimension of the second mounting hole 2521, so that the contact area between the seal 254 and the hole wall of the second mounting hole 2521 is large enough, thereby improving the seal 254's effect on the second end cap 252 and the second mounting hole 2521. Radial sealing performance of the electrode terminal 253.
  • the size of the first mounting hole 2511 along its axial direction is b, b ⁇ 0.5 mm; and/or the size of the second mounting hole 2521 along its axial direction is k, k ⁇ 0.5 mm.
  • the dimension b of the first mounting hole 2511 along its axial direction is the size of the first mounting hole 2511 along the axial direction Y of the mounting hole.
  • b can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.5mm, etc.
  • the dimension k of the second mounting hole 2521 along its axial direction is the dimension of the second mounting hole 2521 along the axial direction Y of the mounting hole.
  • k can be 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.5mm, etc.
  • the first mounting hole 2511 along its axial direction is ⁇ 0.5 mm
  • the first mounting hole 2511 has sufficient area along its axial direction to contact the seal 254, thereby ensuring that the seal 254 is in contact with the first mounting hole 2511.
  • the size k of the second mounting hole 2521 along its axial direction is ⁇ 0.5 mm
  • the second mounting hole 2521 has sufficient area along its axial direction to contact the seal 254, thereby ensuring that the seal 254 is in contact with the second mounting hole 2521. Sealing performance between hole wall and electrode terminal 253.
  • 1.2mm ⁇ b ⁇ 2.5mm; and/or 1.2mm ⁇ k ⁇ 2.5mm Preferably, 1.2mm ⁇ b ⁇ 2.5mm; and/or 1.2mm ⁇ k ⁇ 2.5mm.
  • b can be 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.2mm, 2.3mm, etc.
  • k can be 1.3mm, 1.5mm, 1.7mm, 1.9mm, 2mm, 2.2mm, 2.3mm, etc.
  • the axial dimension b of the first mounting hole 2511 satisfies 1.2 mm ⁇ b ⁇ 2.5 mm, it can ensure that the first mounting hole 2511 has sufficient area along its axial direction to contact the seal 254 , thereby ensuring that the seal 254
  • the sealing performance between the hole wall of the first mounting hole 2511 and the electrode terminal 253 can control the axial size of the first end cover 251 along the first mounting hole 2511 within a reasonable range, thereby avoiding the end cover assembly. 25
  • the size along the axial direction of the first mounting hole 2511 is too large.
  • the dimension k of the second mounting hole 2521 along its axial direction satisfies 1.2mm ⁇ k ⁇ 2.5mm, it can ensure that the second mounting hole 2521 has sufficient area along its axial direction to contact the seal 254, thereby ensuring that the seal 254
  • the sealing performance between the hole wall of the second mounting hole 2521 and the electrode terminal 253 can control the axial size of the second end cover 252 along the second mounting hole 2521 within a reasonable range, thereby avoiding the need for end cover assembly. 25
  • the size along the axial direction of the second mounting hole 2521 is too large.
  • the seal 254 includes a body part 2547 and a limiting part 2548.
  • the limiting part 2548 is protruding from the outer peripheral surface of the body part 2547, along the radial direction of the mounting hole 2500, The limiting portion 2548 at least partially extends between the first end cap 251 and the second end cap 252 .
  • the limiting portion 2548 is used to limit the body portion 2547 along the axial direction Y of the mounting hole to limit the range of movement of the body portion 2547 along the axial direction Y of the mounting hole or to prevent the body portion 2547 from moving along the axial direction Y of the mounting hole.
  • the radial direction of the body part 2547 is the radial direction of the first mounting hole 2511, and/or the radial direction of the body part 2547 is the radial direction of the second mounting hole 2521, the radial direction of the first mounting hole 2511 and the second mounting hole 2521
  • the radial direction of is also the radial direction of the mounting hole 2500.
  • the body part 2547 is an integrally formed structure.
  • the body part 2547 is sleeved on the outer periphery of the terminal body 2531. A part of the body part 2547 is inserted into the first mounting hole 2511, and a part of the body part 2547 is inserted into the second mounting hole 2521.
  • the limiting portion 2548 extends from the outer peripheral surface of the body portion 2547 along the radial direction of the body portion 2547 .
  • the limiting portion 2548 has an opposite first surface 25481 and a second surface 25482.
  • the first surface 25481 is disposed facing the third surface 2513 of the first end cover 251.
  • the first surface 25481 can be connected with the third surface 25481.
  • the surfaces 2513 are offset
  • the second surface 25482 is disposed facing the fourth surface 2523 of the second end cap 252, and the second surface 25482 can offset the fourth surface 2523.
  • the limiting portion 2548 can limit The movement range of the body portion 2547 of the seal 254 in the axial direction Y of the mounting hole.
  • the limiting part 2548 and the body part 2547 may be integrally formed, so that the formed seal 254 has an integrally formed structure.
  • One-piece structure refers to a structure formed by one-piece molding methods, such as injection molding, stamping, pouring, etc.
  • the limiting portion 2548 is used to limit the position of the body portion 2547 along the axial direction Y of the mounting hole, so as to reduce the amount of movement of the seal 254 in the axial direction Y of the mounting hole or to prevent the seal 254 from moving along the axial direction Y of the mounting hole. , thereby reducing the risk of seal failure.
  • the limiting part 2548 has various structural forms.
  • the limiting part 2548 includes a plurality of limiting blocks 25483 arranged along the circumferential spacing of the body part 2547. Multiple means two or more.
  • the plurality of limiting blocks 25483 may be evenly spaced along the circumferential direction of the body part 2547, or may be non-uniformly spaced.
  • the limiting portion 2548 continuously surrounds the outer periphery of the body portion 2547 .
  • the limiting portion 2548 continuously surrounds the outer periphery of the body portion 2547 to form a ring-shaped limiting portion 2548, which can limit the body portion 2547 in the axial direction Y of the mounting hole at any position in the circumferential direction of the body portion 2547, thereby improving sealing.
  • the stability of the component 254 relative to the first end cap 251, the second end cap 252 and the electrode terminal 253 reduces the risk of sealing failure.
  • the first end cap 251 and the second end cap 252 clamp the limiting portion 2548 (shown in FIG. 21 ).
  • the second surface 2522 of the first end cap 251 and the fourth surface 2523 of the second end cap 252 respectively offset the two end surfaces of the limiting member along the axial direction Y of the mounting hole, then the second surface 2522 and the The four surfaces 2523 and the limiting portion 2548 work together to prevent the seal 254 from moving along the axial direction Y of the mounting hole.
  • the composite end cover 250 also includes a first insulating member 257.
  • the first insulating member 257 is stacked on the first end cover 251 and the second end cover. 252 , the mounting hole 2500 penetrates the first end cover 251 , the second end cover 252 and the first insulating member 257 ; the mounting hole 2500 also includes a third mounting hole 2571 provided in the first insulating member 257 .
  • the first insulating member 257 has a third mounting hole 2571, and the third mounting hole 2571, the first mounting hole 2511 and the second mounting hole 2521 are coaxially arranged.
  • the terminal body 2531 passes through the first mounting hole 2511, the second mounting hole 2521 and the third mounting hole 2571. Portions of the seal 254 may be located within the third mounting hole 2571.
  • the seal 254 includes a first portion 2544 and a second portion 2545 that are independent of each other, neither the first portion 2544 nor the second portion 2545 may extend into the third mounting hole 2571 .
  • the first mounting hole 2511, the second mounting hole 2521 and the third mounting hole 2571 are coaxially arranged.
  • the diameter of the third mounting hole 2571 and the diameter of the first mounting hole 2511 may be the same or different.
  • the diameter of the third mounting hole 2571 and the diameter of the second mounting hole 2521 may be the same or different.
  • the diameter of the first mounting hole 2511 is greater than the diameter of the second mounting hole 2521, and the diameter of the first mounting hole 2511 is greater than the diameter of the third mounting hole 2571.
  • the provision of the first insulating member 257 can prevent the battery 100 group with the end cover assembly 25 from being short-circuited due to the contact between the first end cover 251 and the second end cover 252, thereby improving the efficiency of the battery 100 group with the end cover assembly 25. and battery 100 safety.
  • the end cap assembly 25 due to the existence of manufacturing tolerances of various components of the end cap assembly 25, that is, the manufacturing tolerances of the first end cap 251 in the axial direction Y of the mounting hole, the manufacturing tolerances of the second end cap 252 in the axial direction Y of the mounting hole, and The manufacturing tolerance of the first insulating member 257 in the axial direction Y of the mounting hole, if the seal 254 is along the stacking direction of the first end cover 251, the first insulating member 257 and the second end cover 252 (ie, the axial direction Y of the mounting hole) seal, then the compression amount of the seal 254 in the axial direction Y of the mounting hole is the accumulation of tolerances of the various components of the composite end cover 250 stacked along the axial direction Y of the mounting hole, that is, the compression amount of the seal 254 in the axial direction Y of the mounting hole.
  • the compression amount is the accumulation of the tolerance of the first insulating member 257 along the axial direction Y of the mounting hole, the tolerance of the first end cap 251 along the axial direction Y of the mounting hole, and the tolerance of the second end cap 252 along the axial direction Y of the mounting hole.
  • the cumulative tolerance is too large, so the compression amount of the seal 254 along the axial direction Y of the mounting hole fluctuates too much relative to the preset compression amount. Insufficient compression of the seal 254 may result in poor sealing, or excessive compression of the seal 254 may cause damage to the seal. 254, resulting in unreliable sealing of the end cap assembly 25.
  • At least part of the seal 254 is located in the mounting hole 2500.
  • the hole wall of the mounting hole 2500 and the electrode terminal 253 jointly clamp the portion of the seal 254 located in the mounting hole 2500. Then along the radial direction of the mounting hole 2500, the electrode terminal 253 and the mounting The hole wall of the hole 2500 cooperates with the compression seal 254 to seal between the electrode terminal 253 and the mounting hole 2500 along the radial direction of the mounting hole 2500.
  • the compression amount of the seal 254 along the radial direction of the mounting hole 2500 is compared with the preset value. There may be fluctuations in the amount of compression, which is determined by the sum of the radial tolerance of the electrode terminal 253 and the radial tolerance of the mounting hole 2500.
  • the axial Y direction realizes the sealing method of the sealed composite end cap 250 and the electrode terminal 253. This solution simplifies the dimensional chain in the compression direction of the seal 254 and reduces the impact of cumulative dimensional tolerance, thereby improving the dimensional stability of the sealing interface and improving the sealing reliability.
  • the seal 254 includes a body portion 2547 and a limiting portion 2548.
  • the limiting portion 2548 is protruding from the outer peripheral surface of the body portion 2547.
  • the limiting portion 2548 at least partially extends to In the embodiment between the first end cover 251 and the second end cover 252, the limiting portion 2548 is located in the third mounting hole 2571.
  • the composite end cap 250 includes the first insulating member 257
  • the limiting portion A gap is formed between the end surface of 2548 facing the first end cap 251 and the second surface 2522 and/or a gap is formed between the end surface of the limiting portion 2548 facing the second end cap 252 and the fourth surface 2523, then the seal 254 can Move within a certain range along the axial Y direction of the mounting hole.
  • the seal 254 cannot move along the axial direction Y of the installation hole.
  • the limiting portion 2548 is located in the third mounting hole 2571 and extends along the radial direction of the mounting hole 2500 to between the first end cover 251 and the second end cover 252.
  • the limiting portion 2548 can move the body portion 2547 along the axial direction of the mounting hole.
  • Y limit is used to reduce the movement amount of the seal 254 in the axial direction Y of the installation hole or to prevent the seal 254 from moving along the axial direction Y of the installation hole, thereby reducing the risk of seal failure.
  • the aperture of the third mounting hole 2571 is larger than the aperture of the first mounting hole 2511, the aperture of the third mounting hole 2571 is larger than the aperture of the second mounting hole 2521, and the limiting portion 2548 is along the mounting hole 2500. radially protrudes from the hole wall of the first mounting hole 2511 and the hole wall of the second mounting hole 2521 .
  • the limiting portion 2548 is located protruding from the hole wall of the first mounting hole 2511 and the second mounting hole 2521, and the limiting portion 2548 faces away from the hole wall.
  • a third gap 260 may be formed between the outer peripheral surface of the body part 2547 and the hole wall of the third mounting hole 2571 to provide space for the seal 254 to deform.
  • the limiting portion 2548 protrudes from the hole wall of the first mounting hole 2511 and the second mounting hole 2521 along the radial direction of the installation 2500. Therefore, along the axial direction Y of the mounting hole, the two ends of the limiting portion 2548 can respectively It offsets the first end cap 251 and the second end cap 252 to limit the position of the seal 254 in the axial direction Y of the installation hole, thereby reducing the risk of seal failure.
  • the end cap assembly 25 may not be provided with the first insulating member 257.
  • the limiting portion 2548 extends between the first end cover 251 and the second end cover 252. Along the axial direction Y of the mounting hole, the first surface 25481 of the limiting portion 2548 offsets the third surface 2513 of the first end cover 251.
  • the second surface 25482 of the limiting part 2548 abuts the fourth surface 2523 of the second end cap 252 , and the limiting part 2548 insulates the first end cap 251 and the second end cap 252 .
  • the limiting portion 2548 not only functions to limit the movement of the seal 254 in the axial direction Y of the installation hole, but also functions to insulate and separate the first end cover 251 and the second end cover 252 .
  • the seal 254 may not be provided with the limiting portion 2548 .
  • the minimum thickness of the portion of the seal 254 located in the mounting hole 2500 is e, satisfying 0.5 mm ⁇ e ⁇ 3 mm.
  • the thickness of the portion of the seal 254 located in the first mounting hole 2511 is e1, 0.5mm ⁇ e1 ⁇ 3mm; and/ Or, along the radial direction of the second installation hole 2521, the thickness of the portion of the seal 254 located in the second installation hole 2521 is e2, and 0.5mm ⁇ e2 ⁇ 3mm.
  • the thickness e(e1) of the portion of the seal 254 located in the first mounting hole 2511 refers to the thickness of the seal 254 along the first mounting hole after being squeezed by the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531.
  • the radial size of the hole 2511 can also be understood as the distance between the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531 along the radial direction of the first mounting hole 2511 .
  • e(e1) can be 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 2.8mm, etc.
  • the thickness f(e2) of the portion of the sealing member 254 located in the second mounting hole 2521 refers to the thickness of the sealing member 254 along the second mounting hole after being squeezed by the hole wall of the first mounting hole 2511 and the outer peripheral surface of the terminal body 2531.
  • the radial size of the hole 2521 can also be understood as the distance between the hole wall of the second mounting hole 2521 and the outer peripheral surface of the terminal body 2531 along the radial direction of the second mounting hole 2521 .
  • f(e2) can be 0.6mm, 0.7mm, 0.8mm, 1mm, 1.3mm, 1.5mm, 1.7mm, 2mm, 2.5mm, 2.8mm, etc.
  • the minimum thickness e of the portion of the seal 254 located in the mounting hole 2500 satisfies 0.5 mm ⁇ e ⁇ 3 mm, which facilitates control of the compression amount of the seal 254 along the radial direction of the mounting hole 2500 , thereby improving the stability of the seal.
  • the electrode terminal 253 includes a terminal body 2531 that passes through the mounting hole 2500 and a seal 254 that is sleeved on the outer periphery of the terminal body 2531 .
  • the terminal body 2531 includes a first section 25311 and a second section 25312 that are connected.
  • the materials of the first section 25311 and the second section 25312 can be different.
  • the material of the first section 25311 is copper
  • the material of the second section 25312 is aluminum
  • the material of the first section 25311 is aluminum
  • the material of the second section 25312 is nickel.
  • the materials of the first section 25311 and the second section 25312 can be the same.
  • the materials of the first section 25311 and the second section 25312 are both copper or aluminum.
  • the seal 254 is sleeved on the first section 25311 and the second section 25312.
  • the terminal body 2531 may also be an integrally formed structure.
  • the terminal body 2531 is inserted through the first mounting hole 2511 and the second mounting hole 2521, so that the first end cover 251 and the second end cover 252 form a positioning fit with the electrode terminal 253, thereby improving the electrode terminal 253 and the first end cover 251. and the second end cap 252 are relatively stable.
  • the sealing member 254 is sleeved on the outer periphery of the terminal body 2531 and can form a positioning fit with the electrode terminal 253 to improve the installation stability and achieve a stable sealing effect.
  • the electrode terminal 253 also includes a first connecting portion 2532 and a second connecting portion 2533.
  • the first connecting portion 2532 and the second connecting portion 2533 both protrude from the terminal body 2531.
  • the first connecting part 2532 is provided on the side of the first end cap 251 facing away from the second end cap 252
  • the second connecting part 2533 is provided on the side of the second end cap 252 facing away from the first end cap 251 .
  • the first connecting part 2532 is sleeved on one end of the terminal body 2531.
  • the first connecting part 2532 is sleeved on the first section 25311.
  • the first section 25311 includes a connected first main body part 25313 and a first sleeve part 25314.
  • the first main body part 25313 is connected to the second section 25312.
  • the first sleeve part 25314 is connected to the first main body part 25313 and faces away from the second section 25312. one end.
  • the diameter of the first socket part 25314 is smaller than the diameter of the first main body part 25313.
  • the first connecting part 2532 is sleeved on the outer periphery of the first sleeve part 25314.
  • the surface of the first connecting portion 2532 facing the second end cap 252 abuts an end of the first main body portion 25313 away from the second section 25312.
  • the second connecting part 2533 is sleeved on the other end of the terminal body 2531.
  • the second connecting part 2533 is sleeved on the second section 25312.
  • the second section 25312 includes a connected second main body part 25315 and a second sleeve part 25316.
  • the second main body part 25315 is connected to the first section 25311.
  • the second sleeve part 25316 is connected to the second main body part 25315 away from the first section 25311. one end.
  • the diameter of the second sleeve portion 25316 is smaller than the diameter of the second main body portion 25315.
  • the second connecting part 2533 is sleeved on the outer periphery of the second socket part 25316.
  • the surface of the second connecting portion 2533 facing the first end cap 251 abuts the end of the second main portion 25315 away from the first section 25311.
  • the first connecting part 2532 is riveted to the terminal body 2531
  • the second connecting part 2533 is riveted to the terminal body 2531.
  • the terminal body 2531 is provided with a first recess 2534 and a first recessed part 2534 at both ends along the axial direction Y of the mounting hole.
  • Two recesses 2535 are provided.
  • the first recess 2534 is recessed from an end of the first socket portion 25314 of the first section 25311 away from the first main body portion 25313 toward the second section 25312.
  • the second recess 2535 is recessed from an end of the second socket portion 25316 of the second section 25312 away from the second main body portion 25315 toward the first section 25311.
  • the first recessed portion and the second recessed portion are used to cooperate with the force applying component during the riveting process.
  • the first connecting part 2532 and the terminal body 2531, and the second connecting part 2533 and the terminal body 2531 may also adopt other connection methods, such as welding, bonding, bolting, etc.
  • the tabs of the first electrode assembly 23 may be conductively connected to the terminal body 2531 through the first connection portion 2532 .
  • the tabs of the second electrode assembly 24 can be conductively connected to the terminal body 2531 through the second connection portion 2533 .
  • one of the first connecting part 2532 and the second connecting part 2533 may be integrally formed with the terminal body 2531, and the other may be riveted with the terminal body 2531.
  • the first connection part 2532 and the second connection part 2533 are both connected to the terminal body 2531 and are respectively located on the side of the first end cover 251 away from the second end cover 252 and the side of the second end cover 252 away from the first end cover 251 , can play a limiting role, so that the structure of the end cover assembly 25 is more compact and the structural stability of the end cover assembly 25 can be improved.
  • the composite end cap 250 further includes a second insulating member 258 and a third insulating member 259. At least part of the second insulating member 258 is located at the first connection portion 2532. and the first end cap 251 to insulate the first connection part 2532 and the first end cap 251. At least part of the third insulating member 259 is located between the second connection part 2533 and the second end cap 252 to insulate and isolate it.
  • the second insulating member 258 includes a first insulating part 2581 and a second insulating part 2582.
  • the first insulating part 2581 is stacked on the first end cover 251 and the second insulating part 2582. between a connecting portion 2532 so as to insulate the first connecting portion 2532 and the first end cap 251 .
  • the first insulating part 2581 has a first insertion hole 2583 for the terminal body 2531 to pass through, and the first insertion hole 2583 and the first mounting hole 2511 are coaxially arranged.
  • the diameter of the first insertion hole 2583 is larger than the diameter of the first mounting hole 2511.
  • the mounting hole 2500 also includes a first insertion hole 2583 of the second insulator 258 .
  • the second insulating part 2582 is connected to the first insulating part 2581. Along the axial direction Y of the mounting hole, the second insulating part 2582 extends from the first insulating part 2581 in a direction away from the first end cover 251, and the second insulating part 2582 extends To the outer periphery of the first connecting part 2532, the second insulating part 2582 is surrounding the outer periphery of the first connecting part 2532.
  • the first insulating part 2581 and the second insulating part 2582 jointly define a first receiving part for accommodating the first connecting part 2532. , it can be understood that the second insulating member 258 covers the first connecting portion 2532 to further reduce the risk of short circuit of the battery 100 .
  • the first connecting portion 2532 can also extend out of the first receiving portion in a direction away from the first end cap 251 to facilitate conductive connection between the first connecting portion 2532 and the tab of the first electrode assembly 23 .
  • the first connecting portion 2532 may be integrally located within the first receiving portion.
  • the entire second insulating member 258 may be located between the first connecting portion 2532 and the first end cap 251 .
  • the third insulating member 259 includes a third insulating part 2591 and a fourth insulating part 2592.
  • the third insulating part 2591 is stacked on the second end cover 252 and the third insulating part 2592. between the two connecting parts 2533 so as to insulate the second connecting part 2533 and the second end cap 252 .
  • the third insulating part 2591 has a second insertion hole 2593 for the terminal body 2531 to pass through, and the second insertion hole 2593 and the second mounting hole 2521 are coaxially arranged.
  • the diameter of the second insertion hole 2593 is larger than the diameter of the second mounting hole 2521.
  • the mounting hole 2500 also includes a second insertion hole 2593 of the third insulating member 259 .
  • the fourth insulating part 2592 is connected to the third insulating part 2591.
  • the fourth insulating part 2592 extends from the third insulating part 2591 in a direction away from the second end cover 252, and the fourth insulating part 2592 extends To the outer periphery of the second connecting part 2533, the fourth insulating part 2592 is surrounding the outer periphery of the second connecting part 2533.
  • the third insulating part 2591 and the fourth insulating part 2592 jointly define a second receiving part for accommodating the second connecting part 2533. , it can be understood that the third insulating member 259 covers the second connecting portion 2533 to further reduce the risk of short circuit of the battery 100 .
  • the second connecting portion 2533 can also extend out of the second receiving portion in a direction away from the second end cap 252 to facilitate conductive connection between the second connecting portion 2533 and the tab of the second electrode assembly 24 .
  • the second connecting portion 2533 may be integrally located within the second receiving portion.
  • the entire third insulating member 259 may be located between the second connecting portion 2533 and the second end cap 252 .
  • the arrangement of the second insulating member 258 and the third insulating member 259 can reduce the risk of short circuit between the battery assembly 20 and the battery 100 having the end cover assembly 25 .
  • the end cover assembly 25 includes the second insulating member 258 and the fourth insulating member, if the sealing member 254 is along the stacking direction of the first end cover 251, the first insulating member 257 and the second end cover 252 (ie, the direction of the mounting hole) axial Y) sealing, then the compression amount of the seal 254 in the axial direction Y of the mounting hole is the accumulation of tolerances of the various components of the composite end cover 250 stacked along the axial direction Y of the mounting hole, that is, the compression amount of the seal 254 in the axial direction Y of the mounting hole.
  • the amount of compression in the axial direction Y is the tolerance of the first insulating member 257 along the axial direction Y of the mounting hole, the tolerance of the first end cap 251 along the axial direction Y of the mounting hole, and the tolerance of the second end cap 252 along the axial direction Y of the mounting hole.
  • the accumulation of tolerances is the tolerance of the second insulating member 258 along the axial direction Y of the mounting hole.
  • the cumulative tolerance is too large, so the compression amount of the seal 254 along the axial direction Y of the mounting hole fluctuates too much relative to the preset compression amount. Insufficient compression of the seal 254 may result in poor sealing, or excessive compression of the seal 254 may cause damage to the seal. 254, resulting in unreliable sealing of the end cap assembly 25'.
  • Part of the seal 254 is located in the first mounting hole 2511, and part is located in the second mounting hole 2521.
  • the hole wall of the first mounting hole 2511 and the electrode terminal 253 jointly hold the portion of the seal 254 located in the first mounting hole 2511, and
  • the hole wall of the second mounting hole 2521 and the electrode terminal 253 jointly clamp the portion of the seal 254 located in the second mounting hole 2521. Then, along the radial direction of the mounting hole 2500, the electrode terminal 253 and the hole wall of the mounting hole 2500 cooperate to compress and seal.
  • the component 254 is sealed between the electrode terminal 253 and the mounting hole 2500 along the radial direction of the mounting hole 2500.
  • the compression amount of the sealing member 254 along the radial direction of the mounting hole 2500 may fluctuate compared to the preset compression amount. This fluctuation The amount is determined by the sum of the radial tolerance of the electrode terminal 253 and the radial tolerance of the mounting hole 2500, compared to the seal 254 which is compressed in the axial direction Y of the mounting hole to achieve sealing of the composite end cap in the axial direction Y of the mounting hole. 250 and the electrode terminal 253, this solution simplifies the dimensional chain in the compression direction of the seal 254 and reduces the impact of cumulative dimensional tolerance, thereby improving the dimensional stability of the sealing interface and improving sealing reliability.
  • the embodiment of the present application also provides a battery assembly 20.
  • the battery assembly 20 includes a first housing 21, a second housing 22 and an end cover assembly 25 provided in any of the above embodiments; the first housing 21 is used to accommodate the first electrode assembly. 23; The second housing 22 is used to accommodate the second electrode assembly 24; the first end cover 251 covers the opening of the first housing 21, the second end cover 252 covers the opening of the second housing 22, and the electrode terminal 253 is used for To achieve electrical connection between the first electrode assembly 23 and the second electrode assembly 24.
  • the first end cap 251 covers the opening of the first housing 21 , and the two jointly define a space for accommodating the first electrode assembly 23 .
  • the second end cap 252 covers the opening of the second housing 22 , and the two jointly define a space for accommodating the second electrode assembly 24 .
  • the electrode terminals 253 are conductively connected to the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24 respectively, so that the first electrode assembly 23 and the second electrode assembly 24 are connected in series.
  • the electrode terminal 253 and the positive electrode tab 231 of the first electrode assembly 23 may be directly conductively connected, or the electrode terminal 253 and the positive electrode tab 231 of the first electrode assembly 23 may be indirectly conductively connected through a current collecting member.
  • the electrode terminal 253 and the negative electrode tab 241 of the second electrode assembly 24 may be directly conductively connected, or the electrode terminal 253 and the negative electrode tab 241 of the second electrode assembly 24 may be indirectly conductively connected through a current collecting member.
  • the end cover assembly 25 provided by any of the above embodiments has better sealing performance. Therefore, the battery assembly 20 having the end cover assembly 25 also has better sealing performance, reducing the risk of leakage of the battery assembly 20 from the end cover assembly 25 .
  • An embodiment of the present application also provides a battery 100.
  • the battery 100 includes the battery assembly 20 provided in any of the above embodiments.
  • An embodiment of the present application also provides an electrical device.
  • the electrical device includes the battery 100 provided in the above embodiment.
  • the embodiment of the present application provides a battery assembly 20.
  • the battery assembly 20 includes a first housing 21, a second housing 22, a first electrode assembly 23, a second electrode assembly 24 and an end cap assembly 25.
  • the end cover assembly 25 includes a composite end cover 250 provided with a mounting hole 2500.
  • the composite end cover 250 includes a first end cover 251, a first insulating member 257, a second end cover 252, an electrode terminal 253, a second insulating member 258, and a second insulating member 258.
  • the second insulating member 258, the first end cap 251, the first insulating member 257, the second end cap 252 and the third insulating member 259 are stacked in sequence.
  • the mounting hole 2500 penetrates the second insulating member 258, the first end cap 251, the third insulating member 259 and the second insulating member 258.
  • the terminal body 2531 of the electrode terminal 253 passes through the first insertion hole 2583 of the second insulating member 258, the first mounting hole 2511 of the first end cover 251, the third mounting hole 2571 of the first insulating member 257, and the second end cover in sequence. 252 and the second insertion hole 2593 of the third insulating member 259.
  • the first connecting portion 2532 of the electrode terminal 253 is located on a side of the first end cap 251 facing away from the second end cap 252
  • the second connecting portion 2533 of the electrode terminal 253 is located on a side of the second end cap 252 facing away from the first end cap 251 .
  • the first insulating member 257 insulates and separates the first end cap 251 and the second end cap 252 .
  • the first insulating part 2581 of the second insulating member 258 insulates and separates the first connection part 2532 of the first end cover 251 and the electrode terminal 253 in the axial direction Y of the mounting hole, and the second insulating part 2582 of the second insulating member 258 separates from the first connecting part 2532 of the first end cover 251 and the electrode terminal 253.
  • An insulating portion 2581 extends from the outer periphery of the first connecting portion 2532 .
  • the third insulating part 2591 of the third insulating member 259 insulates and separates the second end cover 252 and the second connecting part 2533 of the electrode terminal 253 in the axial direction Y of the mounting hole, and the fourth insulating part 2592 of the third insulating member 259 separates from the third
  • the insulating portion 2591 extends from the outer periphery of the second connecting portion 2533 .
  • a part of the body portion 2547 of the seal 254 is located in the first mounting hole 2511.
  • the outer peripheral surface of the terminal body 2531 of the electrode terminal 253 and the hole wall of the first mounting hole 2511 jointly clamp the body portion 2547 of the seal 254 in the first mounting hole.
  • the portion inside the hole 2511 allows the seal 254 to seal the electrode terminal 253 and the first end cap 251 along the radial direction of the first mounting hole 2511 .
  • the first end surface 2541 of the seal 254 is located in the first mounting hole 2511, and the first end surface 2541 is closer to the second end cap 252 relative to the surface (first surface 2512) of the first end cap 251 away from the second end cap 252, so that Along the axial direction Y of the mounting hole, a first gap 255 is formed between the first end surface 2541 and the first surface 2512. It can also be understood that along the axial direction Y of the mounting hole, the first end surface 2541 of the seal 254 and the first insulation The surface of the portion 2581 facing the first end cap 251 does not contact.
  • a part of the body portion 2547 of the seal 254 is located in the second mounting hole 2521.
  • the outer peripheral surface of the terminal body 2531 of the electrode terminal 253 and the hole wall of the second mounting hole 2521 jointly clamp the body portion 2547 of the seal 254 in the second mounting hole.
  • the portion inside the hole 2521 allows the seal 254 to seal the electrode terminal 253 and the second end cap 252 along the radial direction of the second mounting hole 2521 .
  • the second end surface 2543 of the seal 254 is located in the second mounting hole 2521, and the second end surface 2543 is closer to the first end cap 251 relative to the surface of the second end cap 252 away from the first end cap 251 (second surface 2522), so that Along the axial direction Y of the mounting hole, a second gap 256 is formed between the second end surface 2543 and the second surface 2522. It can also be understood that along the axial direction Y of the mounting hole, the second end surface 2543 of the seal 254 and the third insulation The surface of the portion 2591 facing the second end cap 252 does not contact.
  • the limiting portion 2548 of the seal 254 protrudes from the outer peripheral surface of the body portion 2547 along the radial direction of the body portion 2547 .
  • the limiting portion 2548 is arranged around the body portion 2547 to form an annular structure.
  • the limiting portion 2548 is located in the third mounting hole 2571.
  • a third gap 260 is formed between the surface of the limiting portion 2548 away from the body portion 2547 and the hole wall of the third mounting hole 2571.
  • the first electrode assembly 23 is accommodated in the first housing 21 , and the first end cover 251 of the end cover assembly 25 covers the opening of the first housing 21 .
  • the second electrode assembly 24 is accommodated in the second housing 22 , and the second end cover 252 of the end cover assembly 25 covers the opening of the first housing 21 .
  • the first connection portion 2532 and the second connection portion 2533 of the electrode terminal 253 are conductively connected to the positive electrode tab 231 of the first electrode assembly 23 and the negative electrode tab 241 of the second electrode assembly 24 respectively.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请提供了一种端盖组件、电池组件、电池及用电设备，涉及电池技术领域。端盖组件包括复合端盖、电极端子和密封件；复合端盖设有贯穿复合端盖的安装孔，复合端盖包括沿安装孔的轴向层叠设置的第一端盖和第二端盖，安装孔贯穿第一端盖和第二端盖；电极端子穿设于安装孔；密封件的至少部分位于安装孔内，并且安装孔的孔壁与电极端子夹持密封件的至少一部分，密封件在安装孔和电极端子之间形成径向密封，本方案的密封方式的密封性能和密封的可靠性更好，密封方式更加简单、方便。且密封件径向密封相对密封件沿安装孔的轴向密封的方式，能够减小端盖组件沿安装孔的轴向的尺寸，从而有利于提高具备该端盖组件的电池组和电池的能量密度。

Description

端盖组件、电池组件、电池及用电设备 技术领域
本申请涉及电池技术领域，具体而言，涉及一种端盖组件、电池组件、电池及用电设备。
背景技术
目前，车辆使用较多的电池一般是锂离子电池，锂离子电池作为一种可再充电电池，具有体积小、能量密度高、功率密度高、循环使用次数多和存储时间长等优点。
电池单体包括端盖组件、壳体和电极组件，端盖封盖壳体的开口，以使形成容纳电极组件的外壳。外壳的密封性能对电池的安全性能至关重要。因此，如何提高外壳的密封性能成为电池技术领域亟待解决的问题。
发明内容
本申请实施例提供一种端盖组件、电池组件、电池及用电设备，以提高电池的密封性能。
第一方面，本申请实施例提供一种端盖组件，包括复合端盖、电极端子和密封件；所述复合端盖设有贯穿所述复合端盖的安装孔，所述复合端盖包括沿所述安装孔的轴向层叠设置的第一端盖和第二端盖，所述第一端盖用于封盖第一壳体的开口和所述第二端盖用于封盖第二壳体的开口，所述安装孔贯穿所述第一端盖和所述第二端盖；所述电极端子穿设于所述安装孔；所述密封件的至少部分位于所述安装孔内，并且所述安装孔的孔壁与所述电极端子夹持所述密封件的至少一部分。
上述技术方案中，密封件的至少一部分位于安装孔内，且安装孔的孔壁与电极端子夹持密封件位于安装孔中的部分，则沿安装孔的径向，电极端子和安装孔的孔壁配合压缩密封件以密封电极端子和复合端盖，即密封件在安装孔和电极端子之间形成径向密封，相较于密封件在安装孔的轴向上被压缩从而在安装孔的轴向上实现密封第一端盖和电极端子和/或在安装孔的轴向上密封第二端盖和电极端子的密封方式，本方案的密封方式的密封性能和密封的可靠性更好，密封方式更加简单、方便。且密封件径向密封相对密封件沿安装孔的轴向密封的方式，能够减小端盖组件沿安装孔的轴向的尺寸，从而有利于提高具备该端盖组件的电池组和电池的能量密度。
在本申请第一方面的一些实施例中，所述安装孔包括设于所述第一端盖的第一安装孔；所述密封件的至少部分位于所述第一安装孔内，并且所述第一安装孔的孔壁和所述电极端子夹持所述密封件位于所述第一安装孔内的部分。
上述技术方案中，密封件的至少部分位于第一安装孔内，且密封件位于第一安装孔中的部分被第一安装孔的孔壁和电极端子夹持，则密封件在第一安装孔和电极端子之间形成径向密封，密封性能好以及密封可靠性较高。
在本申请第一方面的一些实施例中，沿所述安装孔的轴向，所述密封件具有第一端面，所述第一端面位于所述第一安装孔内。
上述技术方案中，密封件位于安装孔的轴向上的第一端面位于第一安装孔内，则沿安装孔的轴向，第一端面和第一安装孔的一端之间可以存在第一间隙，该第一间隙允许密封件被第一安装孔的孔壁和电极端子夹持的过程中沿安装孔的轴向发生形变，以使第一安装孔的孔壁和电极端子能够使密封件产生足够的压缩量，从而保证第一端盖和电极端子之间的密封性能。
在本申请第一方面的一些实施例中，沿所述安装孔的轴向，所述密封件位于所述第一安装孔内的部分的尺寸为a，所述第一安装孔的尺寸为b，其中，a/b＞1/2。
上述技术方案中，密封件位于第一安装孔内的部分沿安装孔的轴向的尺寸大于第一安装孔的轴向尺寸的一半，使得密封件和第一安装孔的孔壁的接触面积足够大，从而提高密封件对第一端盖和电极端子的径向密封性能。
在本申请第一方面的一些实施例中，所述安装孔还包括设于所述第二端盖的第二安装孔；所述密封件的部分位于所述第一安装孔内，所述密封件的部分位于所述第二安装孔内，并且所述第二安装孔的孔壁和所述电极端子夹持所述密封件位于所述第二安装孔内的部分。
上述技术方案中，密封件的一部分位于第一安装孔内，以沿第一安装孔的径向密封第一端盖和电极端子，密封件的一部分位于第二安装孔内，并沿第二安装孔的径向密封电极端子和第二端盖，使得第一端盖和电极端子之间的密封性能较好和密封可靠性较高，以及第二端盖和电极端子之间的密封性能较好和密封可靠性较高，从而提高端盖组件的密封性能。
在本申请第一方面的一些实施例中，沿所述安装孔的轴向，所述密封件具有第二端面，所述第二端面位于所述第二安装孔内。
上述技术方案中，密封件位于安装孔的轴向上的第二端面位于第二安装孔内，则沿安装孔的轴向，第二端面和第二安装孔的一端之间存在第二间隙，该第二间隙允许密封件被第二安装孔的孔壁和电极端子夹持的过程中沿安装孔的轴向发生形变，以使第二安装孔的孔壁和电极端子能够使密封件产生足够的压缩量，从而保证第二端盖和电极端子之间的密封性能。
在本申请第一方面的一些实施例中，沿所述安装孔的轴向，所述密封件位于所述第二安装孔内的部分的尺寸为h，所述第二安装孔的尺寸为k，其中，h/k＞1/2。
上述技术方案中，密封件位于第二安装孔内的部分沿安装孔的轴向的尺寸大于第二安装孔的轴向尺寸的一半，使得密封件和第二安装孔的孔壁的接触面积足够大，从而提高密封件对第二端盖和电极端子的径向密封性 能。
在本申请第一方面的一些实施例中，所述第一安装孔沿其轴向的尺寸为b，b≥0.5mm；和/或，所述第二安装孔沿其轴向的尺寸为k，k≥0.5mm。
上述技术方案中，第一安装孔沿其轴向的尺寸b≥0.5mm，以使第一安装孔沿其轴向上有足够的面积与密封件接触，从而保证密封件在第一安装孔的孔壁和电极端子之间的密封性能；第二安装孔沿其轴向的尺寸k≥0.5mm，以使第二安装孔沿其轴向上有足够的面积与密封件接触，从而保证密封件在第二安装孔的孔壁和电极端子之间的密封性能。
在本申请第一方面的一些实施例中，1.2mm≤b≤2.5mm；和/或1.2mm≤k≤2.5mm。
上述技术方案中，第一安装孔沿其轴向的尺寸b满足1.2mm≤b≤2.5mm，既能保证第一安装孔沿其轴向上有足够的面积与密封件接触，从而保证密封件在第一安装孔的孔壁和电极端子之间的密封性能，又能将第一端盖沿第一安装孔的轴向的尺寸控制在合理的范围内，从而避免端盖组件沿第一安装孔的轴向的尺寸过大；和/或，第二安装孔沿其轴向的尺寸k满足1.2mm≤k≤2.5mm，既能保证第二安装孔沿其轴向上有足够的面积与密封件接触，从而保证密封件在第二安装孔的孔壁和电极端子之间的密封性能，又能将第二端盖沿第二安装孔的轴向的尺寸控制在合理的范围内，从而避免端盖组件沿第二安装孔的轴向的尺寸过大。
在本申请第一方面的一些实施例中，所述密封件包括本体部和限位部，所述限位部凸设于所述本体部的外周面，沿所述安装孔的径向，所述限位部至少部分延伸至所述第一端盖和所述第二端盖之间。
上述技术方案中，限位部用于对本体部沿安装孔的轴向限位，以减小密封件在安装孔的轴向上的移动量或者避免密封件沿安装孔的轴向移动，从而降低密封失效的风险。
在本申请第一方面的一些实施例中，限位部连续环绕于所述本体部的外周。
上述技术方案中，限位部连续环绕于本体部的外周，能够在本体部的周向上任意位置对本体部在安装孔的轴向上进行限位，提高密封件相对第一端盖、第二端盖和电极端子的稳定性，降低密封失效的风险。
在本申请第一方面的一些实施例中，沿所述安装孔的轴向，所述第一端盖和所述第二端盖夹持所述限位部。
上述技术方案中，限位部被第一端盖和第二端盖夹持，则密封件不能沿安装孔的轴向移动，从而降低密封失效的风险。
在本申请第一方面的一些实施例中，所述复合端盖还包括第一绝缘件，沿所述安装孔的轴向，所述第一绝缘件层叠设置于所述第一端盖和所述第二端盖之间，所述安装孔贯穿所述第一端盖、所述第二端盖和所述第一绝缘件；所述安装孔还包括设于所述第一绝缘件的第三安装孔。
上述技术方案中，第一绝缘件的设置能够避免因第一端盖和第二端盖接触而导致具备该端盖组件的电池组和电池短路，提高具备该端盖组件的电池组和电池的安全性。
在本申请第一方面的一些实施例中，所述密封件包括本体部和限位部，所述限位部凸设于所述本体部的外周面，沿所述安装孔的径向，所述限位部至少部分延伸至所述第一端盖和所述第二端盖之间，所述限位部位于所述第三安装孔内。
上述技术方案中，限位部位于第三安装孔内且沿安装孔的径向延伸至第一端盖和第二端盖之间，限位部能够对本体部沿安装孔的轴向限位，以减小密封件在安装孔的轴向上的移动量或者避免密封件沿安装孔的轴向移动，从而降低密封失效的风险。
在本申请第一方面的一些实施例中，所述第三安装孔的孔径大于所述第一安装孔，所述第三安装孔的孔径大于所述第二安装孔的孔径，所述限位部沿所述安装孔的径向凸出于所述第一安装孔的孔壁和所述第二安装孔的孔壁。
上述技术方案中，限位部沿安装孔的径向凸出于第一安装孔的孔壁和第二安装孔的孔壁，因此，沿安装孔的轴向，限位部的两端能够分别与第一端盖和第二端盖相抵，从而在安装孔的轴向对密封件起到限位作用，从而降低密封失效的风险。
在本申请第一方面的一些实施例中，沿所述安装孔的径向，所述密封件位于所述安装孔内的部分的最小厚度为e，满足0.5mm≤e≤3mm。
上述技术方案中，密封件位于安装孔内的部分的最小厚度e，满足0.5mm≤e≤3mm，便于控制密封件沿安装孔的径向的压缩量，从而有利于提升密封的稳定性。
在本申请第一方面的一些实施例中，所述电极端子包括端子本体，所述端子本体穿设于所述安装孔，所述密封件套设于所述端子本体的外周。
上述技术方案中，端子本体穿设于安装孔，以使复合端盖与电极端子形成定位配合，提高电极端子、第一端盖和第二端盖三者相对稳定性。密封件套设于端子本体的外周，能够和电极端子形成定位配合，提高安装稳定性，以起到稳定的密封作用。
在本申请第一方面的一些实施例中，所述电极端子还包括第一连接部和第二连接部，所述第一连接部和所述第二连接部均凸出于所述端子本体的外周，所述第一连接部设置于所述第一端盖背离所述第二端盖的一侧，所述第二连接部设置于所述第二端盖背离所述第一端盖的一侧。
上述技术方案中，第一连接部和第二连接部均与端子本体连接，且分别位于第一端盖背离第二端盖的一侧和第二端盖背离第一端盖的一侧，能够起到限位作用，以使端盖组件的结构更加紧凑和能够提高端盖组件结构的稳定性。
在本申请第一方面的一些实施例中，所述复合端盖还包括第二绝缘件和第三绝缘件，所述第二绝缘件的至少部分位于所述第三连接部和所述第一端盖之间，以绝缘隔离所述第一连接部和所述第一端盖，所述第三绝缘件 的至少部分位于所述第二连接部和所述第二端盖之间，以绝缘隔离所述第二连接部和所述第二端盖。
上述技术方案中，第二绝缘件和第三绝缘件的设置，能够降低具备该端盖组件的电池组件和电池短路的风险。
第二方面，本申请实施例还提供一种电池组件，包括第一壳体、第二壳体和第一方面任意实施例提供端盖组件；所述第一壳体用于容纳第一电极组件；所述第二壳体用于容纳第二电极组件；所述第一端盖封盖所述第一壳体的开口，所述第二端盖封盖所述第二壳体的开口，所述电极端子用于实现所述第一电极组件和所述第二电极组件电连接。
上述技术方案中，第一方面实施例提供的端盖组件的密封性能较好，因此，具备该端盖组件的电池组件的密封性能也较好，降低电池组件从端盖组件处漏液的风险。
第三方面，本申请实施例提供一种电池，包括第二方面实施例提供电池组件。
第四方面，本申请实施例提供一种用电设备，包括第三方面实施例提供的电池。
附图说明
为了为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，应当理解，以下附图仅示出了本申请的某些实施例，因此不应被看作是对范围的限定，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相关的附图。
图1为现有技术中的电池组件的结构示意图；
图2为现有技术中端盖组件的剖视图；
图3为图2中A处的放大图；
图4为本申请一些实施例提供的车辆的结构示意图；
图5为本申请一些实施例提供的电池的结构示意图；
图6为本申请一些实施例提供的电池组件的结构示意图；
图7为本申请一些实施例提供的电池组件的爆炸图；
图8为本申请一些实施例提供的端盖组件的爆炸图；
图9为本申请一些实施例提供的端盖组件的结构示意图；
图10为本申请一些实施例提供的端盖组件的剖视图；
图11为图10中B处的剖视图；
图12为本申请另一些实施例提供的端盖组件的剖视图；
图13为图12中C处的放大图；
图14为本申请再一些实施例提供的端盖组件的剖视图；
图15为图14中D处的放大图；
图16为本申请又一些实施例提供的端盖组件的剖视图；
图17为图16中E处的放大图；
图18为本申请的另一些实施例提供的端盖组件的剖视图；
图19为图18中F处的放大图；
图20为本申请的再一些实施例提供的端盖组件的剖视图；
图21为图20中G处的放大图；
图22为本申请一些实施例提供的密封件的结构示意图；
图23为本申请另一些实施例提供的密封件的结构示意图；
图24为本申请再一些实施例提供的密封件的结构示意图；
图25为本申请一些实施例提供的电极端子的结构示意图；
图26为本申请一些实施例提供的第一绝缘件的结构示意图；
图27为本申请一些实施例提供的第二绝缘件的结构示意图。
图标：1000-车辆；100-电池；10-箱体；11-第一箱体；12-第二箱体；20'、20-电池组件；21'、21-第一壳体；211-第一开口；22'、22-第二壳体；221-第二开口；23'、23-第一电极组件；231-正极耳；24'、24-第二电极组件；241-负极耳；25'、25-端盖组件；250-复合端盖；2500-安装孔；251'、251-第一端盖；2511-第一安装孔；2512-第一表面；2513-第三表面；252'、252-第二端盖；2521-第二安装孔；2522-第二表面；2523-第四表面；253'、253-电极端子；2531'、2531-端子本体；25311-第一段；25312-第二段；25313-第一主体部；25314-第一套接部；25315-第二主体部；25316-第二套接部；2532'、2532-第一连接部；2533'、2533-第二连接部；2534-第一凹部；2535-第二凹部；254'、254-密封件；2541-第一端面；2542-第三端面；2543-第二端面；2544-第一部分；2545-第二部分；2546-第四端面；2547-本体部；2548-限位部；25481-第一面；25482-第二面；25483-限位块；255-第一间隙；256-第二间隙；257'、257-第一绝缘件；2571-第三安装孔；258'、258-第二绝缘件；2581-第一绝缘部；2582-第二绝缘部；2583-第一插孔；259'、259-第三绝缘件；2591-第三绝缘部；2592-第四绝缘部；2593-第二插孔；260-第三间隙；200-控制器；300-马达；X-第一方向；Y-安装孔的轴向。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。通常在此处附图中描述和示出的本申请实施例的组件可以以各种不同的配置来布置和设计。
因此，以下对在附图中提供的本申请的实施例的详细描述并非旨在限制要求保护的本申请的范围，而是仅仅表示本申请的选定实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步定义和解释。
在本申请实施例的描述中，需要说明的是，指示方位或位置关系为基于附图所示的方位或位置关系，或者是该申请产品使用时惯常摆放的方位或位置关系，或者是本领域技术人员惯常理解的方位或位置关系，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”等仅用于区分描述，而不能理解为指示或暗示相对重要性。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
电池技术的发展要同时考虑多方面的设计因素，例如，能量密度、循环寿命、放电容量、充放电倍率等性能参数，另外，还需要考虑电池的密封性能。电池在使用过程中，对密封性要求极高，如果电池的密封性不良，水汽可能渗入电池内部，与电解液发生副反应，影响电池性能，缩短电池寿命。电解液也可能流出，腐蚀电池线路，影响电气安全。
发明人注意到，为了提高电池的电压，可以将多个电池单体通过汇流部件串联，这种情况下可以通过在电池的外部引出两根导线分别连接电池的正输送极(多个电池单体中的一者的正极电极端子)和负输送极(多个电池单体中的一者的负极电极端子)，配合采集电路板进行电池的相关信息(比如电压信息)。这种串联方式汇流部件占据空间较大，使得电池的能量密度较低。
为了缓解电池能量密度低的问题，申请人研究发现，可以对电池的多个电池单体的串联方式进行改进，不需要设置汇流部件，两个电极组件共用电极端子，从而实现两个电极组件电连接，从而形成串联的电池组件。具体而言，如图1-图3所示，电池组件20包括第一壳体21'、第二壳体22'、第一电极组件23'、第二电极组件24'和端盖组件25'。端盖组件25'包括第一端盖251'、第二端盖252'、电极端子253'、密封件254'、第一绝缘件257'、第二绝缘件258'和第三绝缘件259'。电极端子253'包括端子本体2531'、第一连接部2532'和第二连接部2533'。第二绝缘件258'、第一端盖251'、第一绝缘件257'、第二端盖252'和第三绝缘件259'沿第一方向X依次层叠布置。第一端盖251'和第二端盖252'分别用于封盖第一壳体21'的开口和第二壳体22'的开口。第一连接部2532'和第二连接部2533'均与端子本体2531'连接，端子本体2531'穿设于第二绝缘件258'、第一端盖251'、第一绝缘件257'、第二端盖252'和第三绝缘件259'。第一连接部2532'位于第二绝缘件258'背离第一端盖251'的一侧，第二绝缘件258'绝缘分隔第一连接部2532'和第一端盖251'，第二连接部2533'位于第三绝缘件259'背离第一端盖251'的一侧，第三绝缘件259'绝缘分隔第二连接部2533'和第二端盖252'。沿第一方向X，第一连接部2532'和第一端盖251'共同压缩密封件254'位于第一连接部2532'和第一端盖251'之间的部分，以使密封件254'的部分在第一方向X上密封于第一连接部2532'和第一端盖251'之间。沿第一方向X，第二连接部2533'和第二端盖252'共同压缩密封件254'位于第二连接部2533'和第二端盖252'之间的部分，以使密封件254'的部分在第一方向X上密封于第二连接部2533'和第二端盖252'之间，可以理解为密封件254'沿第一端盖251'和第二端盖252'的层叠方向密封第一端盖251'和电极端子253'，以及密封第二端盖252'和电极端子253'。
这种密封方式不仅组装复杂，密封性能和密封可靠性较差，还使得电极组件沿第一方向X的尺寸较大，使得具备该端盖组件25'的电池组和电池的能量密度较低。
基于上述考虑，为了缓解端盖组件密封可靠性差的问题，发明人经过深入研究，设计了一种端盖组件，端盖组件包括复合端盖、电极端子和密封件，复合端盖设有贯穿复合端盖的安装孔，复合端盖包括沿安装孔的轴向层叠设置的第一端盖和第二端盖，安装孔贯穿第一端盖和第二端盖，电极端子穿设于安装孔；密封件的至少部分位于安装孔内，并且安装孔的孔壁与电极端子夹持密封件的至少一部分。
密封件的至少一部分位于安装孔内，且安装孔的孔壁与电极端子夹持密封件位于安装孔中的部分，则沿安装孔的径向，电极端子和安装孔的孔壁配合压缩密封件以密封电极端子和复合端盖，即密封件在安装孔和电极端子之间形成径向密封，相较于密封件在安装孔的轴向上被压缩从而在安装孔的轴向上实现密封第一端盖和电极端子和/或在安装孔的轴向上密封第二端盖和电极端子的密封方式，本方案的密封方式的密封性能和密封的可靠性更好，密封方式更加简单、方便。
且密封件径向密封相对密封件沿安装孔的轴向密封的方式，能够减小端盖组件沿安装孔的轴向的尺寸，从而有利于提高具备该端盖组件的电池组和电池的能量密度。
本申请实施例公开的端盖组件可以用于具备该端盖组件的电池组件或电池中，还可以用于由具备该端盖组件的电池组件或电池组成的电源系统的用电设备中，这样，便于获取电池的相关信息，从而便于监控用电设备的用电情况。
本申请实施例提供一种使用电池作为电源的用电设备，用电设备可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电设备为车辆1000为例进行说明。
请参照图4，图4为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图5，图5为本申请一些实施例提供的电池100的爆炸图。电池100包括箱体10和至少一个电池组件20，电池组件20容纳于箱体10内。其中，箱体10用于为电池组件20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一箱体11和第二箱体12，第一箱体11与第二箱体12相互盖合，第一箱体11和第二箱体12共同限定出用于容纳电池组件20的容纳空间。第二箱体12可以为一端开口以形成容纳电池组件20的容纳腔的空心结构，第一箱体11可以为板状结构，第一箱体11盖合于第二箱体12的开口侧，以使第一箱体11与第二箱体12共同限定出容纳空间；第一箱体11和第二箱体12也可以是均为一侧开口的以形成容纳电池组件20的容纳腔的空心结构，第一箱体11的开口侧盖合于第二箱体12的开口侧。当然，第一箱体11和第二箱体12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
如图6、图7所示，电池组件20包括第一壳体21、第二壳体22、第一电极组件23、第二电极组件24和端盖组件25。
第一壳体21具有第一开口211，第二壳体22具有第二开口221，端盖组件25封盖第一开口211和第二开口221，端盖组件25和第一壳体21限定出容纳第一电极组件23的空间，端盖组件25和第二壳体22限定出容纳第二电极组件24的空间。
第一壳体21和第二壳体22可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，第一壳体21和第二壳体22的形状可以根据电极组件的具体形状和尺寸大小来确定。第一壳体21和第二壳体22的形状可以相同，也可以不同。第一壳体21和第二壳体22的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
第一电极组件23和第二电极组件24均由正极片(图中未示出)、负极片(图中未示出)和隔离膜(图中未示出)组成。电池组件20主要依靠金属离子在正极片和负极片之间移动来工作。正极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体，未涂敷正极活性物质层的正极集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体，未涂敷负极活性物质层的负极集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。此外，第一电极组件23和第二电极组件24可以是卷绕式结构，也可以是叠片式结构；第一电极组件23的一者可以为卷绕式结构，另一者可以为叠片式结构。本申请实施例并不限于此。
端盖组件25用于将第一电极组件23和第二电极组件24电连接。其中，可以是第一电极组件23的正极耳231和第二电极组件24的负极耳241通过端盖组件25电连接，以实现第一电极组件23和第二电极组件24电连接；也可以是第一电极组件23的负极耳和第二电极组件24的正极耳通过端盖组件25电连接，以实现第一电极组件23和第二电极组件24电连接；也可以是第一电极组件23的负极耳和第二电极组件24的负极耳通过端盖组件25电连接，以实现第一电极组件23和第二电极组件24电连接。
电池组件20可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。第一电极组件23和第二电极组件24可呈圆柱体、扁平体、长方体或其它形状等。第一壳体21和第二壳体22可呈圆柱体、扁平体、长方体或其它形状等。
如图8-图11所示，端盖组件25包括复合端盖250、电极端子253和密封件254；复合端盖250设有贯穿复合端盖250的安装孔2500，复合端盖250包括沿安装孔的轴向Y层叠设置的第一端盖251和第二端盖252，第一端盖251用于封盖第一壳体21的开口和第二端盖252用于封盖第二壳体22的开口，安装孔2500贯穿第一端盖251和第二端盖252；电极端子253穿设于安装孔2500；密封件254的至少部分位于安装孔2500内，并且安装孔2500的孔壁与电极端子253夹持密封件254的至少一部分。
第一壳体21的开口为第一开口211，第二壳体22的开口为第二开口221。第一端盖251封盖第一开口211，第一端盖251和第一壳体21共同限定出容纳第一电极组件23的第一空间。第二端盖252封盖第二开口221，第二端盖252和第二壳体22共同限定出容纳第二电极组件24的第二空间。第一空间和第二空间还可以容纳电解液以及其他部件。
不限地，第一端盖251的形状可以与第一壳体21的形状或者第一壳体21的第一开口211的形状相适应以配合第一壳体21，第二端盖252的形状可以与第二壳体22的形状或者第二壳体22的第二开口221的形状相适应以配合第二壳体22。可选地，第一端盖251和第二端盖252可以由具有一定硬度和强度的材质(如铝合金)制成，这样，第一端盖251和第二端盖252在受挤压碰撞时就不易发生形变，使电池组件20能够具备更高的结构强度，安全性能也可以有所提高。
第一端盖251和第二端盖252的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
第一端盖251和第二端盖252之间可以绝缘分隔，以降低因第一端盖251和第二端盖252接触而导致电池组件20或者电池100短路。其中，第一端盖251和第二端盖252之间可以通过设置绝缘件而使第一端盖251和第二端盖252绝缘分隔；也可以是第一端盖251和/或第二端盖252本身是绝缘材质，从而实现第一端盖251和第二端盖252绝缘分隔。
密封件254塑料、橡胶等。密封件254可以是沿仅一部分位于安装孔2500内，另一部分延伸出安装孔2500外。密封件254也可以全部位于安装孔2500内。密封件254位于安装孔2500的部分可以全部起到密封作用，也可以仅部分起到密封作用。
密封件254的至少一部分位于安装孔2500内，且安装孔2500的孔壁与电极端子253夹持密封件254位于安装孔2500中的部分，则沿安装孔2500的径向，电极端子253和安装孔2500的孔壁配合压缩密封件254以密封电极端子253和第一端盖251，即密封件254在安装孔2500和电极端子253之间形成径向密封，相较于密封件254在安装孔的轴向Y上被压缩从而在安装孔的轴向Y上实现密封第一端盖251和电极端子253和/或在安装孔的轴向Y上密封第二端盖252和电极端子253的密封方式，本方案的密封方式的密封性能和密封的可靠性更好，密封方式更加简单、方便。且密封件254径向密封相对密封件254沿安装孔的轴向Y密封的方式，能够减小端盖组件25沿安装孔的轴向Y的尺寸，从而有利于提高具备该端盖组件25的电池100组和电池100的能量密度。
如图11-图17所示，在一些实施例中，安装孔2500包括设于第一端盖251的第一安装孔2511；密封件254的至少部分位于第一安装孔2511内，并且第一安装孔2511的孔壁和电极端子253夹持密封件254位于第一安装孔2511内的部分。
密封件254可以全部位于第一安装孔2511孔内。密封件254可以仅部分位于第一安装孔2511，另一部分延伸出第一安装孔2511且延伸出安装孔2500。密封件254也可以部分位于第一安装孔2511，部分延伸至安装孔2500的其他位置。
如图11、图12、图13所示，密封件254可以是全部位于第一安装孔2511内。如图14-图17所示，密封件254可以是沿安装孔的轴向Y的一部分位于第一安装孔2511内。
密封件254的至少部分位于第一安装孔2511内，且密封件254位于第一安装孔2511中的部分被第一安装孔2511的孔壁和电极端子253夹持，则密封件254在第一安装孔2511和电极端子253之间形成径向密封，密封性能好以及密封可靠性较高，能够降低第一端盖251和第一壳体21形成的第一空间从第一安装孔2511漏液的风险。
如图11、图13所示，在一些实施例中，沿安装孔的轴向Y，密封件254具有第一端面2541，第一端面2541位于第一安装孔2511内。
沿安装孔的轴向Y，第一端盖251具有背离第二端盖252的第一表面2512，第一端面2541为密封件254位于第一安装孔2511内且背离第二端盖252的表面，第一端面2541较第一表面2512更靠近第二端盖252。
第一端面2541较第一表面2512更靠近第二端盖252，且第一端面2541位于第一安装孔2511内，则沿安装孔的轴向Y，第一端面2541与第一表面2512之间形成第一间隙255，在第一安装孔2511的孔壁和电极端子253配合压缩密封件254时，该第一间隙255允许密封件254在被第一安装孔2511的孔壁和电极端子253夹持的过程中沿安装孔的轴向Y发生形变，以使第一安装孔2511的孔壁和电极端子253能够使密封件254产生足够的压缩量，从而保证第一端盖251和电极端子253之间的密封性能。
第一端盖251还具有第三表面2513，第三表面2513与第一表面2512在安装孔的轴向Y上相对布置。密封件254还具有第三端面2542，第三端面2542与第一端面2541在安装孔的轴向Y上相对布置。如图11所示，第三端面2542可以与第三表面2513共面。在另一些实施例中，如图13、图15所示，第三端面2542和第三表面2513也可以不共面，即：如图13所示，沿安装孔的轴向Y，第三端面2542较第三表面2513更靠近第一表面2512，则第三端面2542位于第一安装孔2511内，且沿安装孔的轴向Y，第三端面2542与第三表面2513之间形成间隙，在第一安装孔2511的孔壁和电极端子253配合压缩密封件254时，该间隙允许密封件254沿安装孔的轴向Y发生形变，以使第一安装孔2511的孔壁和电极端子253能够使密封件254产生足够的压缩量，从而保证第一端盖251和电极端子253之间的密封性能，这种情况下密封件254全部位于第一安装孔2511内；或，如图15所示，沿安装孔的轴向Y，第三端面2542较第三表面2513更远离第一表面2512，即密封件254沿靠近第二端盖252的方向伸出第一安装孔2511，这种情况下，密封件254的一部分位于第一安装孔2511内。
在另一些实施例中，密封件254沿安装孔的轴向Y的两端可以均延伸出第一安装孔2511。
如图11、图13、图15、图17所示，在一些实施例中，沿安装孔的轴向Y，密封件254位于第一安装孔2511内的部分的尺寸为a，第一安装孔2511的尺寸为b，其中，a/b＞1/2。
如图11、图13所示，在密封件254全部位于第一安装孔2511内的实施例中，“密封件254位于第一安装孔2511内的部分的尺寸a”，是指沿安装孔的轴向Y，第一端面2541和第三端面2542之间的距离。
如图15、图17所示，在密封件254的一部分位于第一安装孔2511内且第一端面2541位于第一安装孔2511内的实施例中，“密封件254位于第一安装孔2511内的部分的尺寸a”，是指沿安装孔的轴向Y，第一端面2541和第三表面2513之间的距离。
在本实施例中，第一安装孔2511贯穿第一端盖251的第一表面2512和第三表面2513。“第一安装孔2511的尺寸b”，是指沿安装孔的轴向Y，第一表面2512和第三表面2513之间的距离。
密封件254位于第一安装孔2511内的部分的尺寸a与第一安装孔2511的尺寸b满足：a/b＞1/2，即密封件254位于第一安装孔2511内的部分沿安装孔的轴向Y的尺寸大于第一安装孔2511的轴向尺寸的一半，使得密封件254和第一安装孔2511的孔壁的接触面积足够大，从而提高密封件254对第一端盖251和电极端子253的径向密封性能。
如图17、图18、图19所示，在一些实施例中，安装孔2500还包括设于第二端盖252的第二安装孔2521；密封件254的部分位于第一安装孔2511内，密封件254的部分位于第二安装孔2521内，并且第二安装孔2521的孔壁和电极端子253夹持密封件254位于第二安装孔2521内的部分。
密封件254位于第二安装孔2521内的部分与密封件254位于第一安装孔2511的部分可以是处于相连的状态，也可以是未连接而彼此独立的状态。图17中示出了密封件254位于第二安装孔2521内的部分与密封件254位于第一安装孔2511的部分处于相连的状态的情况。图19中示出密封件254位于第二安装孔2521内的部分与密封件254位于第一安装孔2511的部分处于未连接而彼此独立的状态的情况。
电极端子253包括穿设于第一安装孔2511和第二安装孔2521内的端子本体2531。密封件254位于第一安装孔2511内的部分被第一安装孔2511的孔壁和端子本体2531的外周面沿第一安装孔2511的径向配合压缩，以实现密封件254径向密封电极端子253和第一端盖251。被挤压后，密封件254位于第一安装孔2511内的部分沿第一安装孔2511的径向的尺寸相对与密封件254位于第一安装孔2511内之前的径向尺寸较小。
密封件254位于第二安装孔2521内的部分被第二安装孔2521的孔壁和端子本体2531的外周面沿第二安装孔2521的径向配合压缩，以实现密封件254径向密封电极端子253和第二端盖252。被挤压后，密封件254位于第二安装孔2521内的部分沿第二安装孔2521的径向的尺寸相对与密封件254位于第二安装孔2521内之前的径向尺寸较小。
密封件254的一部分位于第一安装孔2511内，以沿第一安装孔2511的径向密封第一端盖251和电极端子253，密封件254的一部分位于第二安装孔2521内，并沿第二安装孔2521的径向密封电极端子253和第二端盖252，使得第一端盖251和电极端子253之间的密封性能较好和密封可靠性较高，以及第二端盖252和电极端子253之间的密封性能较好和密封可靠性较高，从而提高端盖组件25的密封性能。
在一些实施例中，沿安装孔的轴向Y，密封件254具有第二端面2543，第二端面2543位于第二安装孔2521内。
第二端盖252具有背离第一端盖251的第二表面2522，第二端面2543为密封件254具有位于第二安装孔2521内且背离第一端盖251的表面，第二端面2543较第二表面2522更靠近第一端盖251。
第二端面2543较第二表面2522更靠近第一端盖251，且第二端面2543位于第二安装孔2521内，则沿安装孔的轴向Y，第二端面2543与第二表面2522之间形成第二间隙256，在第二安装孔2521的孔壁和电极端子253配合压缩密封件254时，该第二间隙256允许密封件254在被第二安装孔2521的孔壁和电极端子253夹持的过程中沿安装孔的轴向Y发生形变，以使第二安装孔2521的孔壁和电极端子253能够使密封件254产生足够的压缩量，从而保证第二端盖252和电极端子253之间的密封性能。
第二端盖252还具有第四表面2523，第四表面2523与第二表面2522在安装孔的轴向Y上相对布置。
如图19所示，在密封件254位于第二安装孔2521内的部分和密封件254位于第一安装孔2511内的部分彼此独立的实施例中，定义密封件254安装于第一安装孔2511内的部分为第一部分2544，第一端面2541和第三端面2542分别为第一部分2544沿安装孔的轴向Y上相对的两个端面。定义密封件254安装于第二安装孔2521内的部分为第二部分2545，第二端面2543为第二部分2545的一个端面，第二部分2545还具有第四端面2546，第四端面2546沿安装孔的轴向Y与第二端面2543相对布置。第四端面2546可以与第四表面2523共面。在另一些实施例中，第四端面2546和第四表面2523也可以不共面，即：沿安装孔的轴向Y，第四端面2546较第四表面2523更靠近第二表面2522，则第四端面2546位于第二安装孔2521内，且沿安装孔的轴向Y，第四端面2546与第四表面2523之间形成间隙，在第二安装孔2521的孔壁和电极端子253配合压缩密封件254时，该间隙允许密封件254在被第二安装孔2521的孔壁和电极端子253夹持的过程中沿安装孔的轴向Y发生形变，以使第二安装孔2521的孔壁和电极端子253能够使密封件254产生足够的压缩量，从而保证第二端盖252和电极端子253之间的密封性能；或，沿安装孔的轴向Y，第四端面2546较第四表面2523更远离第二表面2522，即密封件254沿靠近第一端盖251的方向伸出第二安装孔2521。图19中示出可第四端面2546和第四表面2523共面的情况。
在另一些实施例中，第二部分2545沿安装孔的轴向Y的两端可以均延伸出第二安装孔2521。
如图17、图19所示，在一些实施例中，沿安装孔的轴向Y，密封件254位于第二安装孔2521内的部分的尺寸为h，第二安装孔2521的尺寸为k，其中，h/k＞1/2。
在密封件254位于第二安装孔2521内的部分和密封件254位于第一安装孔2511内的部分彼此独立的实施例中，若第二部分2545全部位于第二安装孔2521内，“密封件254位于第二安装孔2521内的部分的尺寸为h”，是指沿安装孔的轴向Y，第二端面2543和第四端面2546之间的距离；在第二部分2545仅一部分位于第二安装孔2521内且第二端面2543位于第二安装孔2521内的实施例中，“密封件254位于第二安装孔2521内的部分的尺寸为h”，是指沿安装孔的轴向Y，第二端面2543和第四表面2523之间的距离。
在本实施例中，第二安装孔2521贯穿第二端盖252的第二表面2522和第四表面2523。“第二安装孔2521的尺寸k”，是指沿安装孔的轴向Y，第二表面2522和第四表面2523之间的距离。
密封件254位于第二安装孔2521内的部分的尺寸h和第一安装孔2511的尺寸k满足：h/k＞1/2，即密封件254位于第二安装孔2521内的部分沿安装孔的轴向Y的尺寸大于第二安装孔2521的轴向尺寸的一半，使得密封件254和第二安装孔2521的孔壁的接触面积足够大，从而提高密封件254对第二端盖252和电极端子253的径向密封性能。
在一些实施例中，第一安装孔2511沿其轴向的尺寸为b，b≥0.5mm；和/或，第二安装孔2521沿其轴向的尺寸为k，k≥0.5mm。
第一安装孔2511沿其轴向的尺寸b，即第一安装孔2511沿安装孔的轴向Y的尺寸。b可以为0.6mm、0.7mm、0.8mm、0.9mm、1mm、1.1mm、1.5mm等。
第二安装孔2521沿其轴向的尺寸k，即第二安装孔2521沿安装孔的轴向Y的尺寸。k可以为0.6mm、0.7mm、0.8mm、0.9mm、1mm、1.1mm、1.5mm等。
若第一安装孔2511沿其轴向的尺寸b≥0.5mm，使得第一安装孔2511沿其轴向上有足够的面积与密封件254接触，从而保证密封件254在第一安装孔2511的孔壁和电极端子253之间的密封性能。若第二安装孔2521沿其轴向的尺寸k≥0.5mm，使得第二安装孔2521沿其轴向上有足够的面积与密封件254接触，从而保证密封件254在第二安装孔2521的孔壁和电极端子253之间的密封性能。
优选地，1.2mm≤b≤2.5mm；和/或1.2mm≤k≤2.5mm。
比如，b可以为1.3mm、1.5mm、1.7mm、1.9mm、2mm、2.2mm、2.3mm等。k可以为1.3mm、1.5mm、1.7mm、1.9mm、2mm、2.2mm、2.3mm等。
若第一安装孔2511沿其轴向的尺寸b满足1.2mm≤b≤2.5mm，既能保证第一安装孔2511沿其轴向上有足够的面积与密封件254接触，从而保证密封件254在第一安装孔2511的孔壁和电极端子253之间的密封性能，又能将第一端盖251沿第一安装孔2511的轴向的尺寸控制在合理的范围内，从而避免端盖组件25沿第一安装孔2511的轴向的尺寸过大。
若第二安装孔2521沿其轴向的尺寸k满足1.2mm≤k≤2.5mm，既能保证第二安装孔2521沿其轴向上有足够的面积与密封件254接触，从而保证密封件254在第二安装孔2521的孔壁和电极端子253之间的密封性能，又能将第二端盖252沿第二安装孔2521的轴向的尺寸控制在合理的范围内，从而避免端盖组件25沿第二安装孔2521的轴向的尺寸过大。
如图20、图21所示，在一些实施例中，密封件254包括本体部2547和限位部2548，限位部2548凸设于本体部2547的外周面，沿安装孔2500的径向，限位部2548至少部分延伸至第一端盖251和第二端盖252之间。
限位部2548用于对本体部2547沿安装孔的轴向Y限位，以限制本体部2547沿安装孔的轴向Y移动的范围或者阻止本体部2547沿安装孔的轴向Y移动。
本体部2547的径向即第一安装孔2511的径向，和/或，本体部2547的径向即第二安装孔2521的径向，第一安装孔2511的径向和第二安装孔2521的径向也是安装孔2500的径向。
在本体部2547为一体成型结构。本体部2547套设于端子本体2531的外周，本体部2547的一部分穿设于第一安装孔2511内，本体部2547的一部分穿设于第二安装孔2521内。限位部2548从本体部2547的外周面沿本体部2547的径向延伸。沿安装孔的轴向Y，限位部2548具有相对的第一面25481和第二面25482，第一面25481面向第一端盖251的第三表面2513设置，第一面25481可以与第三表面2513相抵，第二面25482面向第二端盖252的第四表面2523设置，第二面25482可以与第四表面2523相抵。
在第一面25481和第三表面2513相抵且第二面25482和第四表面2523相抵情况下，密封件254的本体部2547不能沿安装孔的轴向Y移动。
在第一面25481和第三表面2513沿安装孔的轴向Y具有间隙和/或第二面25482和第四表面2523沿安装孔的轴向Y具有间隙的情况下，限位部2548能够限制密封件254的本体部2547在安装孔的轴向Y的移动范围。
限位部2548和本体部2547可以是一体成型，以使形成的密封件254为一体成型结构。一体成型结构是指采用一体成型的方法形成的结构，比如注塑、冲压、浇筑等。
限位部2548用于对本体部2547沿安装孔的轴向Y限位，以减小密封件254在安装孔的轴向Y上的移动量或者避免密封件254沿安装孔的轴向Y移动，从而降低密封失效的风险。
限位部2548的结构形式有多种，比如，如图22所示，限位部2548包括沿本体部2547的周向间隔部布置的多个限位块25483。多个是指两个及两个以上。多个限位块25483可以沿本体部2547的周向均匀间隔布置，也可以是非均匀间隔布置。
再比如，如图23所示，限位部2548连续环绕于本体部2547的外周。
限位部2548连续环绕本体部2547的外周，以形成环形结构的限位部2548，能够在本体部2547的周向上任意位置对本体部2547在安装孔的轴向Y上进行限位，提高密封件254相对第一端盖251、第二端盖252和电极端子253的稳定性，降低密封失效的风险。
在本实施例中，沿安装孔的轴向Y，第一端盖251和第二端盖252夹持限位部2548(图21中示出)。
可以理解为，第一端盖251的第二表面2522和第二端盖252的第四表面2523分别与限位件沿安装孔的轴向Y上的两端面相抵，则第二表面2522、第四表面2523和限位部2548共同作用，以阻止密封件254沿安装孔的轴向Y上移动。
限位部2548被第一端盖251和第二端盖252夹持，则密封件254不能沿安装孔的轴向Y移动，从而降低密封失效的风险。
如图21所示，在一些实施例中，复合端盖250还包括第一绝缘件257，沿安装孔的轴向Y，第一绝缘件257层叠设置于第一端盖251和第二端盖252之间，安装孔2500贯穿第一端盖251、第二端盖252和第一绝缘件257；安装孔2500还包括设于第一绝缘件257的第三安装孔2571。
第一绝缘件257具有第三安装孔2571，第三安装孔2571、第一安装孔2511和第二安装孔2521同轴布置。端子本体2531穿设于第一安装孔2511、第二安装孔2521和第三安装孔2571。密封件254的部分可以位于第三安装孔2571内。当然，在密封件254包括彼此独立不相连的第一部分2544和第二部分2545的实施例中，第一部分2544和第二部分2545可以均未延伸至第三安装孔2571内。
第一安装孔2511、第二安装孔2521和第三安装孔2571同轴布置。
第三安装孔2571的直径与第一安装孔2511的直径可以相同，也可以不同。第三安装孔2571的直径与第二安装孔2521的直径可以相同，也可以不同。在本实施例中，第一安装孔2511的直径大于第二安装孔2521的直 径，第一安装孔2511的直径大于第三安装孔2571的直径。
第一绝缘件257的设置能够避免因第一端盖251和第二端盖252接触而导致具备该端盖组件25的电池100组和电池100短路，提高具备该端盖组件25的电池100组和电池100的安全性。
此外，由于端盖组件25的各个部件的制造公差的存在，即第一端盖251的在安装孔的轴向Y的制造公差、第二端盖252在安装孔的轴向Y的制造公差以及第一绝缘件257在安装孔的轴向Y的制造公差，若是密封件254沿第一端盖251、第一绝缘件257和第二端盖252的层叠方向(即安装孔的轴向Y)密封，则密封件254在安装孔的轴向Y的压缩量为复合端盖250沿安装孔的轴向Y层叠设置的各个部件的公差的累积，即密封件254在安装孔的轴向Y的压缩量为第一绝缘件257沿安装孔的轴向Y的公差、第一端盖251沿安装孔的轴向Y的公差和第二端盖252沿安装孔的轴向Y的公差的累计。累计公差过大，从而密封件254的沿安装孔的轴向Y的压缩量相对预设压缩量波动过大，可能出现密封件254压缩量不足而导致密封不良或者密封件254压缩过量而损坏密封件254，从而导致端盖组件25密封不可靠。
密封件254的至少部分位于安装孔2500内，安装孔2500的孔壁和电极端子253共同夹持密封件254位于安装孔2500内的部分，则沿安装孔2500的径向，电极端子253和安装孔2500的孔壁配合压缩密封件254，以沿安装孔2500的径向密封于电极端子253和安装孔2500之间，密封件254沿安装孔2500的径向的压缩量相较于预设的压缩量可能存在波动，该波动量由电极端子253的径向公差和安装孔2500的径向公差之和决定，相较于密封件254在安装孔的轴向Y上被压缩从而在安装孔的轴向Y实现密封复合端盖250和电极端子253的密封方式，本方案简化密封件254压缩方向的尺寸链，降低尺寸累计公差影响，从而提升密封界面尺寸稳定性，提升密封可靠性。
请继续参照图21，在密封件254包括本体部2547和限位部2548，限位部2548凸设于本体部2547的外周面，沿安装孔2500的径向，限位部2548至少部分延伸至第一端盖251和第二端盖252之间的实施例中，限位部2548位于第三安装孔2571内。
在复合端盖250包括第一绝缘件257的实施例中，若是第一绝缘件257沿安装孔的轴向Y的尺寸大于限位部2548沿安装孔的轴向Y的尺寸，则限位部2548的面向第一端盖251的端面和第二表面2522之间形成间隙和/或限位部2548的面向第二端盖252的端面和第四表面2523之间形成间隙，则密封件254能够沿安装孔的轴向Y移动一定范围。若是第一绝缘件257沿安装孔的轴向Y的尺寸小于或者等于限位部2548沿安装孔的轴向Y的尺寸，则限位部2548的面向第一端盖251的端面和第二表面2522相抵以及限位部2548的面向第二端盖252的端面和第四表面2523相抵，则密封件254不能够沿安装孔的轴向Y移动。
限位部2548位于第三安装孔2571内且沿安装孔2500的径向延伸至第一端盖251和第二端盖252之间，限位部2548能够对本体部2547沿安装孔的轴向Y限位，以减小密封件254在安装孔的轴向Y上的移动量或者避免密封件254沿安装孔的轴向Y移动，从而降低密封失效的风险。
请继续参见图21，在一些实施例中，第三安装孔2571的孔径大于第一安装孔2511，第三安装孔2571的孔径大于第二安装孔2521的孔径，限位部2548沿安装孔2500的径向凸出于第一安装孔2511的孔壁和第二安装孔2521的孔壁。
沿第三安装孔2571的径向(即安装孔2500的径向)，限位部2548位于凸出于第一安装孔2511的孔壁和第二安装孔2521的孔壁，限位部2548背离本体部2547的外周面与第三安装孔2571的孔壁之间可以形成第三间隙260，为密封件254形变提供空间。
限位部2548沿安装2500的径向凸出于第一安装孔2511的孔壁和第二安装孔2521的孔壁，因此，沿安装孔的轴向Y，限位部2548的两端能够分别与第一端盖251和第二端盖252相抵，从而在安装孔的轴向Y对密封件254起到限位作用，从而降低密封失效的风险。
在密封件254具有限位部2548的实施例中，端盖组件25也可以不设置第一绝缘件257。限位部2548延伸至第一端盖251和第二端盖252之间，沿安装孔的轴向Y，限位部2548的第一面25481与第一端盖251的第三表面2513相抵，限位部2548的第二面25482与第二端盖252的第四表面2523相抵，限位部2548绝缘隔离第一端盖251和第二端盖252。这种情况下，限位部2548既起到了限制密封件254在安装孔的轴向Y移动的作用，又起到绝缘分隔第一端盖251和第二端盖252的作用。
在另一些实施例中，如图24所示，密封件254也可以不设置限位部2548。
在一些实施例中，沿安装孔2500的径向，密封件254位于安装孔2500内的部分的最小厚度为e，满足0.5mm≤e≤3mm。
其中，如图17、图19、图21所示，沿第一安装孔2511的径向，密封件254位于第一安装孔2511内的部分的厚度为e1，0.5mm≤e1≤3mm；和/或，沿第二安装孔2521的径向，密封件254位于第二安装孔2521内的部分的厚度为e2，0.5mm≤e2≤3mm。
“密封件254位于第一安装孔2511内的部分的厚度e(e1)”，是指密封件254被第一安装孔2511的孔壁和端子本体2531的外周面挤压后的沿第一安装孔2511的径向的尺寸，也可以理解为沿第一安装孔2511的径向，第一安装孔2511的孔壁和端子本体2531的外周面之间的距离。比如e(e1)可以为0.6mm、0.7mm、0.8mm、1mm、1.3mm、1.5mm、1.7mm、2mm、2.5mm、2.8mm等。
“密封件254位于第二安装孔2521内的部分的厚度f(e2)”，是指密封件254被第一安装孔2511的孔壁和端子本体2531的外周面挤压后的沿第二安装孔2521的径向的尺寸，也可以理解为沿第二安装孔2521的径向，第二安装孔2521的孔壁和端子本体2531的外周面之间的距离。比如f(e2)可以为0.6mm、0.7mm、0.8mm、1mm、1.3mm、1.5mm、1.7mm、2mm、2.5mm、2.8mm等。
密封件254位于安装孔2500内的部分的最小厚度e，满足0.5mm≤e≤3mm，便于控制密封件254沿安装孔2500的径向的压缩量，从而有利于提升密封的稳定性。
结合参照图21、图25，在一些实施例中，电极端子253包括端子本体2531，端子本体2531穿设于安装孔2500，密封件254套设于端子本体2531的外周。
如图21、图25所示，端子本体2531包括相连的第一段25311和第二段25312。第一段25311和第二段25312的材质可以不同，比如第一段25311的材质为铜，第二段25312的材质为铝，或者第一段25311的材质为铝，第二段25312的材质为镍。第一段25311和第二段25312的材质可以相同，比如第一段25311和第二段25312的材质均为铜或者均为铝。
密封件254套设于第一段25311和第二段25312。
在另一些实施例中，端子本体2531也可以为一体成型结构。
端子本体2531穿设于第一安装孔2511和第二安装孔2521，以使第一端盖251和第二端盖252均与电极端子253形成定位配合，提高电极端子253、第一端盖251和第二端盖252三者相对稳定性。密封件254套设于端子本体2531的外周，能够和电极端子253形成定位配合，提高安装稳定性，以起到稳定的密封作用。
请继续参照图21、图25，在一些实施例中，电极端子253还包括第一连接部2532和第二连接部2533，第一连接部2532和第二连接部2533均凸出于端子本体2531的外周，第一连接部2532设置于第一端盖251背离第二端盖252的一侧，第二连接部2533设置于第二端盖252背离第一端盖251的一侧。
第一连接部2532套设于端子本体2531的一端部，在本实施例中，第一连接部2532套设于第一段25311。第一段25311包括相连的第一主体部25313和第一套接部25314，第一主体部25313与第二段25312连接，第一套接部25314连接于第一主体部25313背离第二段25312的一端。第一套接部25314的直径小于第一主体部25313的直径。第一连接部2532套设于第一套接部25314的外周。第一连接部2532面向第二端盖252的表面与第一主体部25313背离第二段25312的一端相抵。
第二连接部2533套设于端子本体2531的另一端部，在本实施例中，第二连接部2533套设于第二段25312。第二段25312包括相连的第二主体部25315和第二套接部25316，第二主体部25315与第一段25311连接，第二套接部25316连接于第二主体部25315背离第一段25311的一端。第二套接部25316的直径小于第二主体部25315的直径。第二连接部2533套设于第二套接部25316的外周。第二连接部2533面向第一端盖251的表面与第二主体部25315背离第一段25311的一端相抵。
在本实施例中，第一连接部2532和端子本体2531铆接，第二连接部2533和端子本体2531铆接，端子本体2531沿安装孔的轴向Y的两端分别设有第一凹部2534和第二凹部2535。第一凹部2534从第一段25311的第一套接部25314背离第一主体部25313的一端向第二段25312凹陷。第二凹部2535从第二段25312的第二套接部25316背离第二主体部25315的一端向第一段25311凹陷。第一凹陷部和第二凹陷部用于在铆接过程中与施力部件配合。当然，在另一些实施例中，第一连接部2532和端子本体2531、第二连接部2533和端子本体2531也可以采用其他的连接方式，比如焊接、粘接、螺栓连接等。第一电极组件23的极耳可以通过第一连接部2532与端子本体2531导电连接。第二电极组件24的极耳可以通过第二连接部2533与端子本体2531导电连接。
在另一些实施例中，第一连接部2532和第二连接部2533中的一者可以和端子本体2531一体成型，另一者与端子本体2531铆接。
第一连接部2532和第二连接部2533均与端子本体2531连接，且分别位于第一端盖251背离第二端盖252的一侧和第二端盖252背离第一端盖251的一侧，能够起到限位作用，以使端盖组件25的结构更加紧凑和能够提高端盖组件25结构的稳定性。
如图21、图26、图27所示，在一些实施例中，复合端盖250还包括第二绝缘件258和第三绝缘件259，第二绝缘件258的至少部分位于第一连接部2532和第一端盖251之间，以绝缘隔离第一连接部2532和第一端盖251，第三绝缘件259的至少部分位于第二连接部2533和第二端盖252之间，以绝缘隔离第二连接部2533和第二端盖252。
第二绝缘件258可以仅一部分位于第一端盖251和第一连接部2532之间。如图21、图26所示，第二绝缘件258包括第一绝缘部2581和第二绝缘部2582，沿安装孔的轴向Y，第一绝缘部2581层叠设置在第一端盖251和第一连接部2532之间，以使绝缘分隔第一连接部2532和第一端盖251。第一绝缘部2581具有供端子本体2531穿过的第一插孔2583，第一插孔2583和第一安装孔2511同轴布置。第一插孔2583的直径大于第一安装孔2511的直径。安装孔2500还包括第二绝缘件258的第一插孔2583。
第二绝缘部2582连接于第一绝缘部2581，沿安装孔的轴向Y，第二绝缘部2582从第一绝缘部2581沿背离第一端盖251的方向延伸，且第二绝缘部2582延伸至第一连接部2532的外周，第二绝缘部2582围设于第一连接部2532的外周，第一绝缘部2581和第二绝缘部2582共同限定出容纳第一连接部2532的第一容纳部，可以理解为，第二绝缘件258包覆第一连接部2532，进一步降低电池100短路的风险。第一连接部2532也可以沿背离第一端盖251的方向可以延伸出第一容纳部，以便于第一连接部2532与第一电极组件23的极耳导电连接。在另一些实施例中，沿安装孔的轴向Y，第一连接部2532可以整体位于第一容纳部内。
在另一些实施例中，第二绝缘件258也可以全部位于第一连接部2532和第一端盖251之间。
第三绝缘件259可以仅一部分位于第二端盖252和第二连接部2533之间。如图21、图27所示，第三绝缘件259包括第三绝缘部2591和第四绝缘部2592，沿安装孔的轴向Y，第三绝缘部2591层叠设置在第二端盖252和第二连接部2533之间，以使绝缘分隔第二连接部2533和第二端盖252。第三绝缘部2591具有供端子本体2531穿过的第二插孔2593，第二插孔2593和第二安装孔2521同轴布置。第二插孔2593的直径大于第二安装孔2521的直径。安装孔2500还包括第三绝缘件259的第二插孔2593。
第四绝缘部2592连接于第三绝缘部2591，沿安装孔的轴向Y，第四绝缘部2592从第三绝缘部2591沿背离第二端盖252的方向延伸，且第四绝缘部2592延伸至第二连接部2533的外周，第四绝缘部2592围设于第二连接 部2533的外周，第三绝缘部2591和第四绝缘部2592共同限定出容纳第二连接部2533的第二容纳部，可以理解为，第三绝缘件259包覆第二连接部2533，进一步降低电池100短路的风险。第二连接部2533也可以沿背离第二端盖252的方向可以延伸出第二容纳部，以便于第二连接部2533与第二电极组件24的极耳导电连接。在另一些实施例中，沿安装孔的轴向Y，第二连接部2533可以整体位于第二容纳部内。
在另一些实施例中，第三绝缘件259也可以全部位于第二连接部2533和第二端盖252之间。
第二绝缘件258和第三绝缘件259的设置，能够降低具备该端盖组件25的电池组件20和电池100短路的风险。
在端盖组件25包括第二绝缘件258和第四绝缘件的情况下，若是密封件254沿第一端盖251、第一绝缘件257和第二端盖252的层叠方向(即安装孔的轴向Y)密封，则密封件254在安装孔的轴向Y的压缩量为复合端盖250沿安装孔的轴向Y层叠设置的各个部件的公差的累积，即密封件254在安装孔的轴向Y的压缩量为第一绝缘件257沿安装孔的轴向Y的公差、第一端盖251沿安装孔的轴向Y的公差、第二端盖252沿安装孔的轴向Y的公差的累计、第二绝缘件258沿安装孔的轴向Y上的公差。累计公差过大，从而密封件254的沿安装孔的轴向Y的压缩量相对预设压缩量波动过大，可能出现密封件254压缩量不足而导致密封不良或者密封件254压缩过量而损坏密封件254，从而导致端盖组件25'密封不可靠。
密封件254的部分位于第一安装孔2511内，部分位于第二安装孔2521，第一安装孔2511的孔壁和电极端子253共同夹持密封件254位于第一安装孔2511内的部分，以及第二安装孔2521的孔壁和电极端子253共同夹持密封件254位于第二安装孔2521内的部分，则沿安装孔2500的径向，电极端子253和安装孔2500的孔壁配合压缩密封件254，以沿安装孔2500的径向密封于电极端子253和安装孔2500之间，密封件254沿安装孔2500的径向的压缩量相较于预设的压缩量可能存在波动，该波动量由电极端子253的径向公差和安装孔2500的径向公差之和决定，相较于密封件254在安装孔的轴向Y上被压缩从而在安装孔的轴向Y实现密封复合端盖250和电极端子253的密封方式，本方案简化密封件254压缩方向的尺寸链，降低尺寸累计公差影响，从而提升密封界面尺寸稳定性，提升密封可靠性。
本申请实施例还提供一种电池组件20，电池组件20包括第一壳体21、第二壳体22和上述任意实施例提供端盖组件25；第一壳体21用于容纳第一电极组件23；第二壳体22用于容纳第二电极组件24；第一端盖251封盖第一壳体21的开口，第二端盖252封盖第二壳体22的开口，电极端子253用于实现第一电极组件23和第二电极组件24电连接。
在本实施例中，第一端盖251封盖第一壳体21的开口，两者共同限定出容第一电极组件23的空间。第二端盖252封盖第二壳体22的开口，两者共同限定出容第二电极组件24的空间。电极端子253分别导电连接第一电极组件23的正极耳231和第二电极组件24的负极耳241，以实现第一电极组件23和第二电极组件24串联。
电极端子253与第一电极组件23的正极耳231可以是直接导电连接，也可以通过集流构件实现电极端子253和第一电极组件23的正极耳231间接导电连接。电极端子253与第二电极组件24的负极耳241可以是直接导电连接，也可以通过集流构件实现电极端子253和第二电极组件24的负极耳241间接导电连接。
上述任意实施例提供的端盖组件25的密封性能较好，因此，具备该端盖组件25的电池组件20的密封性能也较好，降低电池组件20从端盖组件25处漏液的风险。
本申请实施例还提供一种电池100，电池100包括上述任意实施例提供的电池组件20。
本申请实施例还提供一种用电设备，用电设备包括上述实施例提供的电池100。
本申请实施例提供一种电池组件20，电池组件20包括第一壳体21、第二壳体22、第一电极组件23、第二电极组件24和端盖组件25。端盖组件25包括设有安装孔2500的复合端盖250，复合端盖250包括第一端盖251、第一绝缘件257、第二端盖252、电极端子253、第二绝缘件258、第三绝缘件259和密封件254。第二绝缘件258、第一端盖251、第一绝缘件257、第二端盖252和第三绝缘件259依次层叠设置，安装孔2500贯穿第二绝缘件258、第一端盖251、第一绝缘件257、第二端盖252和第三绝缘件259。电极端子253的端子本体2531依次穿过第二绝缘件258的第一插孔2583、第一端盖251的第一安装孔2511、第一绝缘件257的第三安装孔2571、第二端盖252的第二安装孔2521和第三绝缘件259的第二插孔2593。电极端子253的第一连接部2532位于第一端盖251背离第二端盖252的一侧，电极端子253的第二连接部2533位于第二端盖252背离第一端盖251的一侧。
第一绝缘件257绝缘分隔第一端盖251和第二端盖252。
第二绝缘件258的第一绝缘部2581在安装孔的轴向Y上绝缘分隔第一端盖251和电极端子253的第一连接部2532，第二绝缘件258的第二绝缘部2582从第一绝缘部2581从延伸至第一连接部2532的外周。
第三绝缘件259的第三绝缘部2591在安装孔的轴向Y绝缘分隔第二端盖252和电极端子253的第二连接部2533，第三绝缘件259的第四绝缘部2592从第三绝缘部2591从延伸至第二连接部2533的外周。
密封件254的本体部2547的一部分位于第一安装孔2511内，电极端子253的端子本体2531的外周面与第一安装孔2511的孔壁共同夹持密封件254的本体部2547位于第一安装孔2511内的部分，以使密封件254沿第一安装孔2511的径向密封电极端子253和第一端盖251。密封件254的第一端面2541位于第一安装孔2511内，第一端面2541相对第一端盖251的背离第二端盖252的表面(第一表面2512)更靠近第二端盖252，使得沿安装孔的轴向Y，第一端面2541和第一表面2512之间形成第一间隙255，也可以理解为，沿安装孔的轴向Y，密封件254的第一端面2541和第一绝缘部2581面向第一端盖251的表面不接触。
密封件254的本体部2547的一部分位于第二安装孔2521内，电极端子253的端子本体2531的外周面与第二安装孔2521的孔壁共同夹持密封件254的本体部2547位于第二安装孔2521内部的部分，以使密封件254沿第二安装孔2521的径向密封电极端子253和第二端盖252。密封件254的第二端面2543位于第二安装孔2521内，第二端面2543相对第二端盖252的背离第一端盖251的表面(第二表面2522)更靠近第一端盖251，使得沿安装孔的 轴向Y，第二端面2543和第二表面2522之间形成第二间隙256，也可以理解为，沿安装孔的轴向Y，密封件254的第二端面2543和第三绝缘部2591面向第二端盖252的表面不接触。
密封件254的限位部2548沿本体部2547的径向凸设于本体部2547的外周面。限位部2548环绕本体部2547设置形成环形结构。限位部2548位于第三安装孔2571内，沿第三安装孔2571的径向，限位部2548背离本体部2547的表面与第三安装孔2571的孔壁之间形成第三间隙260。
第一电极组件23容纳于第一壳体21内，端盖组件25的第一端盖251封盖第一壳体21的开口。第二电极组件24容纳于第二壳体22内，端盖组件25的第二端盖252封盖第一壳体21的开口。电极端子253的第一连接部2532和第二连接部2533分别与第一电极组件23的正极耳231和第二电极组件24的负极耳241导电连接。
以上仅为本申请的优选实施例而已，并不用于限制本申请，对于本领域的技术人员来说，本申请可以有各种更改和变化。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (22)

  1. 一种端盖组件，包括：
    复合端盖，设有贯穿所述复合端盖的安装孔，所述复合端盖包括沿所述安装孔的轴向层叠设置的第一端盖和第二端盖，所述第一端盖用于封盖第一壳体的开口和所述第二端盖用于封盖第二壳体的开口，所述安装孔贯穿所述第一端盖和所述第二端盖；
    电极端子，穿设于所述安装孔；
    密封件，至少部分位于所述安装孔内，并且所述安装孔的孔壁与所述电极端子夹持所述密封件的至少一部分。
  2. 根据权利要求1所述的端盖组件，其中，所述安装孔包括设于所述第一端盖的第一安装孔；
    所述密封件的至少部分位于所述第一安装孔内，并且所述第一安装孔的孔壁和所述电极端子夹持所述密封件位于所述第一安装孔内的部分。
  3. 根据权利要求2所述的端盖组件，其中，沿所述安装孔的轴向，所述密封件具有第一端面，所述第一端面位于所述第一安装孔内。
  4. 根据权利要求2或3所述的端盖组件，其中，沿所述安装孔的轴向，所述密封件位于所述第一安装孔内的部分的尺寸为a，所述第一安装孔的尺寸为b，其中，a/b＞1/2。
  5. 根据权利要求2-4任一项所述的端盖组件，其中，所述安装孔还包括设于所述第二端盖的第二安装孔；
    所述密封件的部分位于所述第一安装孔内，所述密封件的部分位于所述第二安装孔内，并且所述第二安装孔的孔壁和所述电极端子夹持所述密封件位于所述第二安装孔内的部分。
  6. 根据权利要求5所述的端盖组件，其中，沿所述安装孔的轴向，所述密封件具有第二端面，所述第二端面位于所述第二安装孔内。
  7. 根据权利要求5或6所述的端盖组件，其中，沿所述安装孔的轴向，所述密封件位于所述第二安装孔内的部分的尺寸为h，所述第二安装孔的尺寸为k，其中，h/k＞1/2。
  8. 根据权利要求5-7任一项所述的端盖组件，其中，所述第一安装孔沿其轴向的尺寸为b，b≥0.5mm；和/或，所述第二安装孔沿其轴向的尺寸为k，k≥0.5mm。
  9. 根据权利要求8所述的端盖组件，其中，1.2mm≤b≤2.5mm；和/或1.2mm≤k≤2.5mm。
  10. 根据权利要求1-9任一项所述的端盖组件，其中，所述密封件包括本体部和限位部，所述限位部凸设于所述本体部的外周面，沿所述安装孔的径向，所述限位部至少部分延伸至所述第一端盖和所述第二端盖之间。
  11. 根据权利要求10所述的端盖组件，其中，所述限位部连续环绕于所述本体部的外周。
  12. 根据权利要求10或11所述的端盖组件，其中，沿所述安装孔的轴向，所述第一端盖和所述第二端盖夹持所述限位部。
  13. 根据权利要求5-9任一项所述的端盖组件，其中，所述复合端盖还包括第一绝缘件，沿所述安装孔的轴向，所述第一绝缘件层叠设置于所述第一端盖和所述第二端盖之间，所述安装孔贯穿所述第一端盖、所述第二端盖和所述第一绝缘件；
    所述安装孔还包括设于所述第一绝缘件的第三安装孔。
  14. 根据权利要求13所述的端盖组件，其中，所述密封件包括本体部和限位部，所述限位部凸设于所述本体部的外周面，沿所述安装孔的径向，所述限位部至少部分延伸至所述第一端盖和所述第二端盖之间，所述限位部位于所述第三安装孔内。
  15. 根据权利要求14所述的端盖组件，其中，所述第三安装孔的孔径大于所述第一安装孔，所述第三安装孔的孔径大于所述第二安装孔的孔径，所述限位部沿所述安装孔的径向凸出于所述第一安装孔的孔壁和所述第二安装孔的孔壁。
  16. 根据权利要求1-15任一项所述的端盖组件，其中，沿所述安装孔的径向，所述密封件位于所述安装孔内的部分的最小厚度为e，满足0.5mm≤e≤3mm。
  17. 根据权利要求1-16任一项所述的端盖组件，其中，所述电极端子包括端子本体，所述端子本体穿设于所述安装孔，所述密封件套设于所述端子本体的外周。
  18. 根据权利要求17所述的端盖组件，其中，所述电极端子还包括第一连接部和第二连接部，所述第一连接部和所述第二连接部均凸出于所述端子本体的外周，所述第一连接部设置于所述第一端盖背离所述第二端盖的一侧，所述第二连接部设置于所述第二端盖背离所述第一端盖的一侧。
  19. 根据权利要求18所述的端盖组件，其中，所述复合端盖还包括第二绝缘件和第三绝缘件，所述第二绝缘件的至少部分位于所述第一连接部和所述第一端盖之间，所述第三绝缘件的至少部分位于所述第二连接部和所述第二端盖之间。
  20. 一种电池组件，包括：
    第一壳体，用于容纳第一电极组件；
    第二壳体，用于容纳第二电极组件；
    如权利要求1-18任一项所述的端盖组件，所述第一端盖封盖所述第一壳体的开口，所述第二端盖封盖所述第二壳体的开口，所述电极端子用于实现所述第一电极组件和所述第二电极组件电连接。
  21. 一种电池，包括如权利要求20所述的电池组件。
  22. 一种用电设备，包括如权利要求21所述的电池。
PCT/CN2022/116280 2022-08-31 2022-08-31 端盖组件、电池组件、电池及用电设备 WO2024045065A1 (zh)

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