WO2024031660A1 - 端盖组件、电池单体、电池及用电设备 - Google Patents

端盖组件、电池单体、电池及用电设备 Download PDF

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Publication number
WO2024031660A1
WO2024031660A1 PCT/CN2022/112191 CN2022112191W WO2024031660A1 WO 2024031660 A1 WO2024031660 A1 WO 2024031660A1 CN 2022112191 W CN2022112191 W CN 2022112191W WO 2024031660 A1 WO2024031660 A1 WO 2024031660A1
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WO
WIPO (PCT)
Prior art keywords
end cap
gap
sealing
cover
housing
Prior art date
Application number
PCT/CN2022/112191
Other languages
English (en)
French (fr)
Inventor
黄守君
陈新祥
郑于炼
林蹬华
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/CN2022/112191 priority Critical patent/WO2024031660A1/zh
Publication of WO2024031660A1 publication Critical patent/WO2024031660A1/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
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing

Definitions

  • the present application relates to the field of battery technology, specifically, to an end cover assembly, a battery cell, a battery and electrical equipment.
  • batteries are used more and more widely, such as in mobile phones, laptops, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. superior.
  • Embodiments of the present application provide an end cover assembly, a battery cell, a battery and electrical equipment components, which can effectively extend the service life of the battery cell.
  • embodiments of the present application provide an end cover assembly, including an end cover, an electrode terminal and a seal; the end cover is provided with an outlet hole, and the end cover is used to close the opening of the first housing; the electrode terminal is at least partially penetrated In the lead-out hole, a sealing gap is formed between the electrode terminal and the end cover.
  • the electrode terminal has a composite interface, and the composite interface and the sealing gap are connected at the junction position; the sealing member is arranged in the sealing gap to seal the electrode terminal and the end cover; wherein , along the direction of the sealing gap from the inside of the first housing to the outside of the first housing, the sealing member includes a sealing starting section located upstream of the junction position, the length of the sealing starting section is d, and the sealing starting section is The thickness is t, satisfying: d>t.
  • the length of the sealing starting section is greater than the thickness of the sealing starting section, so that the sealing starting section located upstream of the junction position is longer, which reduces the flow of electrolyte from the first housing along the sealing gap to the junction.
  • the position corrodes the composite interface, causing the risk of the electrode terminal breaking from the composite interface, increasing the service life of the end cover assembly, thereby increasing the service life of the battery cell.
  • the seal covers the interface location. Part of the seal is located upstream of the junction position, and part is located downstream of the junction position.
  • the seal has a better sealing effect between the electrode terminal and the end cover, improves the sealing performance between the electrode terminal and the end cover, and reduces electrolyte corrosion compounding. Interface risks.
  • the seal is integrally located upstream of the interface in the direction of the seal gap from the interior of the first housing to the exterior of the first housing.
  • the seal is the starting section of the seal, which can effectively reduce the risk of the electrolyte corroding the composite interface and causing the electrode terminal to break.
  • the electrode terminal includes a first connection part, a second connection part and a third connection part, the second connection part is passed through the lead-out hole, and the second connection part is connected to the first connection part and the third connection part.
  • the first connection part and the third connection part are respectively located on both sides of the end cover in the thickness direction, the first connection part is configured to face the inside of the first housing, and a first gap is formed between the first connection part and the end cover, A second gap is formed between the second connecting part and the end cap, a third gap is formed between the third connecting part and the end cap, and the first gap and the third gap are connected through the second gap to form a sealing gap.
  • the second connection part is passed through the lead-out hole, and the first connection part and the third connection part are respectively located on both sides of the end cover in the thickness direction, thereby realizing the installation of the electrode terminal and the end cover, so that the electrode terminal will not separate from the end cover. .
  • the second connection part and the first connection part are made of different materials, and the second connection part and the first connection part are combined to form a composite interface, and the composite interface is connected to the first gap at the interface position.
  • the second connection part and the first connection part are directly combined, and the structure is simple, which can reduce the difficulty of combination.
  • a groove is provided on the side of the first connecting part facing the end cap; the second connecting part includes a composite part accommodated in the groove, and the outer peripheral surface of the composite part is in contact with the groove.
  • the groove sides are composited to form a composite interface.
  • the seal is located at least partially within the first gap and covers the interface. In this way, the risk of electrolyte corrosion of the composite interface can be reduced.
  • the seal includes a first sealing portion and a second sealing portion connected to each other, the first sealing portion is at least partially located within the first gap, the second sealing portion is at least partially located within the second gap, and the sealing initial section Forming part of the first sealing portion.
  • the first sealing part functions to seal the first connecting part and the end cap, and the second sealing part functions to seal the second connecting part and the end cap, thereby improving the sealing performance between the electrode terminal and the end cap.
  • the second connecting part includes a first section and a second section made of different materials.
  • the first section and the second section are arranged along the thickness direction of the end cap.
  • the first section is connected to the first connecting section, and the second section Connected to the third connecting part; along the thickness direction of the end cover, one end of the first section facing away from the first connecting part and one end of the second section facing away from the third connecting part are combined to form a composite interface, and the composite interface is connected to the second gap at the junction position .
  • the composite interface is a plane, an arc surface or a zigzag surface.
  • a flat composite interface can reduce the difficulty of combining the first and second sections; a circular or zigzag composite interface can increase the contact area between the first and second sections and improve the connection strength.
  • the seal is located at least partially within the second gap and covers the interface. In this way, the risk of electrolyte corrosion of the composite interface can be reduced.
  • the first section is integrally formed with the first connecting part; and/or the third connecting part is sleeved on the outside of the second section.
  • the first section and the first connection part are integrally formed, so that the first section and the first connection part have good integrity, and the connection strength between the first section and the first connection part is improved.
  • the third connecting part is sleeved on the outside of the second section, so that the electrode terminal can be more conveniently installed on the end cover.
  • the third connection part includes a first sleeve part and a second sleeve part made of different materials.
  • the first sleeve part is sleeved on the outside of the second connection part
  • the second sleeve part is sleeved on the outside of the second connection part.
  • the outside of the sleeve portion wherein, the inner peripheral surface of the second socket portion and the outer peripheral surface of the first socket portion are combined to form a composite interface, and the composite interface is connected to the third gap at the interface position. In this way, the path for the electrolyte to flow along the sealing gap to the interface position is increased, further reducing the risk of the composite interface being corroded by the electrolyte.
  • the seal is located at least partially within the third gap and covers the interface. In this way, the risk of electrolyte corrosion of the composite interface can be reduced.
  • the seal is entirely located in the first gap and/or the second gap.
  • the entire seal is positioned upstream of the junction.
  • the second connecting part is integrally formed with the first connecting part. In this way, the second connecting part and the first connecting part have good integrity, and the connection strength between the second connecting part and the first connecting part is improved.
  • the end cap assembly further includes a first insulating member and a second insulating member; the first insulating member is at least partially disposed in the first gap to insulate and isolate the first connection part and the end cap; the second insulating member is at least The part is disposed in the third gap to insulate and isolate the third connection part and the end cover.
  • the first insulating piece is at least partially disposed in the first gap to insulate the first connecting portion from the end cap; the second insulating piece is at least partially disposed in the second gap to insulate the third connecting portion from the end cap.
  • the end cap is a plate-like structure formed in one piece.
  • the end cap has a simple structure and can be matched with a shell.
  • the end cover includes a first cover body and a second cover body arranged in a stack, the lead-out hole passes through the first cover body and the second cover body, the first cover body is used to close the opening of the first housing, and the third cover body is used to close the opening of the first housing.
  • the two covers are used to close the opening of the second housing.
  • the end cover of this structure can cooperate with two shells to realize that the two shells share one end cover assembly.
  • the end cover further includes a third insulating member, the lead hole penetrates the third insulating member, and the third insulating member is stacked between the first cover and the second cover to insulate and isolate the first cover and the second cover.
  • Second cover The first cover body and the second cover body can be insulated by the third insulating member.
  • embodiments of the present application provide a battery cell, including a first case, a first electrode assembly and an end cap assembly provided in any embodiment of the first aspect; the first electrode assembly is accommodated in the first case; The electrode terminal is electrically connected to the first electrode assembly, and the end cover closes the opening of the first housing.
  • the battery cell further includes a second case and a second electrode assembly, the second electrode assembly is accommodated in the second case, and the electrode terminal is electrically connected to the second electrode assembly; the end cover includes a stacked first electrode assembly.
  • the end cover further includes a third insulating member, the lead hole penetrates the third insulating member, and the third insulating member is stacked between the first cover and the second cover to insulate and isolate the first cover and the second cover. Second cover.
  • embodiments of the present application provide a battery, including the battery cell provided in any embodiment of the second aspect.
  • embodiments of the present application provide an electrical device, including the battery provided in any embodiment of the third aspect.
  • Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Figure 2 is an exploded view of a battery provided by some embodiments of the present application.
  • Figure 3 is a schematic structural diagram of a battery cell provided by some embodiments of the present application.
  • Figure 4 is a schematic structural diagram of an end cap assembly provided by some embodiments of the present application.
  • Figure 5 is a partial enlarged view of the end cover assembly A shown in Figure 4.
  • Figure 6 is a schematic structural view of the end cap assembly shown in Figure 5 with the seal, first insulating member and second insulating member removed;
  • Figure 7 is a partial view of an end cap assembly provided by some embodiments of the present application.
  • Figure 8 is a partial view of an end cap assembly provided by other embodiments of the present application.
  • Figure 9 is a partial view of an end cap assembly provided by some embodiments of the present application.
  • Figure 10 is a partial view of an end cap assembly provided by some embodiments of the present application.
  • Figure 11 is a partial view of an end cap assembly provided by other embodiments of the present application.
  • Figure 12 is a schematic structural diagram of an end cap assembly provided by other embodiments of the present application.
  • Figure 13 is a partial enlarged view of the end cover assembly B shown in Figure 12;
  • Figure 14 is a schematic structural diagram of a battery cell provided by other embodiments of the present application.
  • Icon 1-case; 1a-first case; 1b-second case; 2-electrode assembly; 2a-first electrode assembly; 2b-second electrode assembly; 21-positive electrode ear; 22-negative electrode ear; 3-end cover assembly; 31-end cover; 311-lead hole; 3111-hole wall; 312-first surface; 313-second surface; 314-first cover; 315-second cover; 316-th Three insulators; 32-electrode terminal; 321-composite interface; 322-junction position; 323-first connection part; 3231-groove; 324-second connection part; 3241-composite part; 3241a-step surface; 3242- First section; 3243-second section; 325-third connection part; 3251-first sleeve part; 3252-second sleeve part; 33-sealing gap; 331-first gap; 332-second gap; 333-Third gap; 34-Sealing member; 341-Sealing starting section; 342-
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
  • connection should be understood in a broad sense.
  • connection can be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • connection can be a fixed connection
  • connection can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • connection can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediate medium; it can be internal communication between two components.
  • “Plural” appearing in this application means two or more (including two).
  • the battery cells may include lithium ion secondary batteries, lithium ion primary batteries, lithium-sulfur batteries, sodium lithium ion batteries, sodium ion batteries or magnesium ion batteries, etc., which are not limited in the embodiments of this application.
  • the battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application are not limited to this.
  • the battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack.
  • Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly consists of a positive electrode sheet, a negative electrode sheet and a separator. Battery cells mainly rely on the movement of metal ions between the positive and negative electrodes 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 cathode current collector without coating the cathode active material layer serves as the cathode 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 lugs is multiple and stacked together, and the number of negative electrode lugs is multiple and stacked together.
  • the material of the isolation film can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.
  • the electrode assembly may have a rolled structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • the electrical connection between the two battery cells is generally achieved by connecting the bus components to the electrode terminals of the two battery cells.
  • the electrode terminals can function as tabs connecting the bus component and the electrode assembly. Since the material of the bus part and the tab of the electrode assembly are generally different, in order to ensure the solidity of the electrode terminal and the bus part and the tab of the electrode assembly after welding, the electrode terminal can be set into a composite structure, and the electrode terminals are divided into different materials. The two parts are combined together. The part of the electrode terminal made of the same material as the tab can be used for welding with the tab, and the part of the electrode terminal made of the same material as the bus part can be used for welding with the bus component.
  • the end cover is provided with an extraction hole through which the electrode terminals are extracted.
  • seals need to be installed between the electrode terminals and the end caps to prevent the electrolyte from leaking to the outside of the battery cells through the outlet holes.
  • the inventor further studied and found that after the electrode terminal is inserted into the lead-out hole of the end cap, a sealing gap is formed between the electrode terminal and the end cap, the sealing member is arranged in the sealing gap, and the composite interface of the electrode terminal and the sealing gap are connected at the junction position.
  • the sealing member is squeezed between the electrode terminal and the end cover.
  • the contact stress between the sealing member and the electrode terminal is not uniform.
  • the sealing member is closer to the battery cell along the sealing gap. The less closely the internal position is in contact with the electrode terminal, and the thickness of the seal is further back, the longer the length of the part of the seal that is not in close contact with the electrode terminal.
  • the electrolyte flows along the small gap between the seal and the electrode terminal to the composite interface of the electrode terminal.
  • the electrolyte corrodes the composite interface, causing the strength of the electrode terminal at the composite interface to decrease.
  • the electrode terminal is easy to break at the composite interface between the two parts, causing the battery cell to be disconnected and affecting the service life of the battery cell.
  • embodiments of the present application provide an end cap assembly in which the length of the sealing initial section of the seal located upstream of the junction position is set to be greater than the thickness of the sealing initial section.
  • the length of the sealing starting section is greater than the thickness of the sealing starting section, so that the sealing starting section located upstream of the junction position is longer, and the thickness of the sealing starting section is thicker, the sealing starting section.
  • Power-consuming devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and power tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.
  • spacecraft include aircraft, rockets, space shuttles, spaceships, etc.
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • Electric drills Electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, planers and more.
  • the following embodiments take the electrical equipment as a vehicle as an example.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • 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 can also 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. 2 is an exploded view of the battery 100 provided by some embodiments of the present application.
  • the battery 100 may include a battery cell 10 and a box 20 , and the battery cell 10 is accommodated in the box 20 .
  • the box 20 is a component that accommodates the battery cells 10.
  • the box 20 provides a storage space for the battery cells 10.
  • the box 20 can adopt a variety of structures.
  • the box 20 may include a first part 201 and a second part 202 , and the first part 201 and the second part 202 cover each other to define an accommodation space for accommodating the battery cells 10 .
  • the first part 201 and the second part 202 can be in various shapes, such as cuboid, cylinder, etc.
  • the first part 201 may be a hollow structure open on one side, and the second part 202 may also be a hollow structure open on one side.
  • the open side of the second part 202 is covered with the open side of the first part 201 to form a box with accommodating space.
  • Body 20 is a component that accommodates the battery cells 10.
  • the box 20 provides a storage space for the battery cells 10.
  • the box 20 can adopt a variety of structures.
  • the box 20 may include a first part 201 and a second part
  • the first part 201 may be a hollow structure with one side open
  • the second part 202 may be a plate-like structure
  • the second part 202 covers the open side of the first part 201 to form a box 20 with a receiving space.
  • the first part 201 and the second part 202 can be sealed by sealing elements, which can be sealing rings, sealants, etc.
  • the battery 100 there may be one battery cell 10 or a plurality of battery cells 10. If there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. Multiple battery cells 10 may be first connected in series, parallel, or mixed to form a battery module, and then multiple battery modules may be connected in series, parallel, or mixed to form a whole, and be accommodated in the box 20 . It is also possible that all the battery cells 10 are directly connected in series or in parallel or mixed together, and then the whole battery cells 10 are accommodated in the box 20 .
  • the battery 100 may further include a bus component, through which the multiple battery cells 10 may be electrically connected to achieve series, parallel, or mixed connection of the multiple battery cells 10 .
  • the bus component can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.
  • FIG. 3 is a schematic structural diagram of a battery cell 10 provided in some embodiments of the present application.
  • the battery cell 10 may include a case 1 , an electrode assembly 2 and an end cap assembly 3 .
  • the housing 1 is a component used to accommodate the electrode assembly 2.
  • the housing 1 may be a hollow structure with an opening formed at one end.
  • the housing 1 may be a hollow structure with openings formed at two opposite ends.
  • the housing 1 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the housing 1 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the electrode assembly 2 is a component in the battery cell 10 where electrochemical reactions occur.
  • the electrode assembly 2 may include a positive electrode sheet, a negative electrode sheet and a separation film.
  • the electrode assembly 2 may be a rolled structure formed by winding a positive electrode sheet, a separator film and a negative electrode sheet, or may be a laminated structure formed by a stacked arrangement of positive electrode sheets, separator films and negative electrode sheets.
  • the electrode assembly 2 has pole tabs, which are divided into positive pole tabs 21 and negative pole tabs 22.
  • the positive pole tabs 21 can be the portions of the positive electrode sheet that are not coated with the positive electrode active material layer
  • the negative electrode tabs 22 can be the portions of the negative electrode sheets that are not coated with the negative electrode active material layer. part.
  • the end cap assembly 3 is a component that covers the opening of the case 1 to isolate the internal environment of the battery cell 10 from the external environment.
  • the housing 1 is a hollow structure with an opening formed at one end
  • one end cover assembly 3 corresponds to closing an opening of the housing 1 ; in the embodiment where the housing 1 is a hollow structure with openings formed at both ends.
  • the end cap assembly 3 is provided with electrode terminals 32 for electrical connection with the tabs of the electrode assembly 2 to output or input electrical energy.
  • the electrode terminal 32 of one end cover assembly 3 can be electrically connected to the positive electrode lug 21 of the electrode assembly 2, and the electrode terminal 32 of the other end cover assembly 3 can be electrically connected to the positive electrode lug 21 of the electrode assembly 2.
  • the negative tab 22 of the electrode assembly 2 is electrically connected.
  • Figure 4 is a schematic structural diagram of the end cover assembly 3 provided by some embodiments of the present application
  • Figure 5 is a partial enlarged view of the end cover assembly 3 shown in Figure 4
  • Figure 6 is a diagram of the end cover assembly 3 shown in Figure 5
  • the shown is a schematic structural diagram of the end cap assembly 3 with the sealing member 34, the first insulating member 35 and the second insulating member 36 removed.
  • the embodiment of the present application provides an end cap assembly 3 , including an end cap 31 , an electrode terminal 32 and a seal 34 .
  • the end cap 31 is provided with a lead-out hole 311 and is used to close the opening of the first housing 1a (shown in FIG. 3).
  • the electrode terminal 32 is at least partially inserted into the lead-out hole 311 .
  • a sealing gap 33 is formed between the electrode terminal 32 and the end cover 31 .
  • the electrode terminal 32 has a composite interface 321 , and the composite interface 321 and the sealing gap 33 are connected at the junction position 322 .
  • the sealing member 34 is disposed in the sealing gap 33 to seal the electrode terminal 32 and the end cap 31 .
  • the sealing member 34 includes a sealing starting section 341 located upstream of the junction position 322, and the length of the sealing starting section 341 is d, the thickness of the sealing initial section 341 is t, and satisfies: d>t.
  • the end cap 31 is a component that closes the opening of the first case 1a to isolate the internal environment of the battery cell 10 from the external environment.
  • the end cap 31 may have a single-layer structure or a multi-layer structure.
  • the lead-out hole 311 is a through hole provided on the end cover 31 for leading the electrode terminal 32 from the inside of the end cover 31 to the outside of the end cover 31 .
  • the inside of the end cover 31 is the side of the end cover 31 facing the first housing 1a, and the outside of the end cover 31 is the side of the end cover 31 facing away from the first housing 1a.
  • the electrode terminal 32 is a component used for outputting or inputting electric energy, and is used for electrical connection with the tab of the electrode assembly 2 .
  • the electrode terminal 32 may be partially located in the lead-out hole 311 , or may be entirely located in the lead-out hole 311 .
  • part of the electrode terminal 32 is located in the lead-out hole 311 , part is located inside the end cover 31 to facilitate the electrical connection between the electrode terminal 32 and the tab, and part is located outside the end cover 31 to facilitate the electrode terminal.
  • 32 Connect to external components, such as busbars.
  • the electrode terminal 32 has two parts of different materials, which are composited together and form a composite interface 321 at the connection location.
  • the two parts are combined and fixed together, and the two parts can be combined together by friction welding.
  • one part is made of copper and the other part is made of aluminum.
  • a sealing gap 33 is formed between the electrode terminal 32 and the end cover 31 .
  • the end cover 31 has an opposite first surface 312 and a second surface 313 .
  • the lead-out hole 311 penetrates the first surface 312 and the second surface 313 , and the first surface 312 faces Inside the first housing 1a (shown in FIG. 3), the hole wall surface 3111 of the lead-out hole 311 connects the first surface 312 and the second surface 313.
  • the first surface 312, the hole wall surface 3111 and the second surface 313 form the first contact surface of the end cap 31.
  • the surface of the electrode terminal 32 opposite to the first contact surface is the second contact surface.
  • the second contact surface and the first contact surface are A sealing gap 33 is formed between them. If the electrode terminal 32 has only a surface opposite to the hole wall surface 3111, a sealing gap 33 is formed between the surface and the hole wall surface 3111; if the electrode terminal 32 has a surface opposite to the first surface 312, the hole wall surface 3111 and the second surface 313, Then a sealing gap 33 is formed between the surface and the first contact surface.
  • junction position 322 is the position where the composite interface 321 intersects with the second contact surface.
  • the surface of the electrode terminal 32 opposite to the second surface 313 is connected to the composite interface 321 at the junction position 322; for another example, the surface of the electrode terminal 32 opposite to the hole wall surface 3111 is connected to the composite interface 321 at the junction position 322; for another example, as As shown in FIG. 6 , the surface of the electrode terminal 32 opposite to the first surface 312 is connected to the composite interface 321 at the interface position 322 .
  • the direction from the inside of the first housing 1 a to the outside of the first housing 1 a along the seal gap 33 is defined as the first direction (the direction of the arrow in the seal gap 33 in FIG. 6 ).
  • the first direction can also be understood as the direction in which the electrolyte flows from the inside of the first housing 1a through the sealing gap 33 to the outside of the first housing 1a.
  • the seal 34 may be an elastomer with a compression modulus less than 1 Gpa.
  • the material of the seal 34 may be plastic, rubber or a mixture of plastic and rubber.
  • plastics can be PP (Polypropylene, polypropylene), PE (polyethylene, polyethylene), PFA (Polyfluoroalkoxy, tetrafluoroethylene-perfluoroalkoxy vinyl ether copolymer), PET (Polyethylene terephthalate, polyterephthalate) Ethylene glycol formate), PBT (Polybutylene terephthalate, polybutylene terephthalate), FEP (Fluorinated ethylene propylene, fluorinated ethylene propylene copolymer), etc.; rubber can be NBR (Nitrile Butadiene Rubber, nitrile rubber) ), FKM (Fluororubber, fluorine rubber), etc.
  • the sealing starting section 341 is the part of the sealing member 34 located upstream of the junction position 322 along the first direction.
  • the sealing member 34 may be partially located upstream of the junction position 322 , or may be located entirely upstream of the junction position 322 .
  • the length of the sealing starting section 341 is the length of the sealing starting section 341 extending along the first direction.
  • the thickness of the sealing starting section 341 is perpendicular to the first direction.
  • the thickness of the sealing starting section 341 can be along the width direction of the sealing gap 33 measured.
  • the thickness of the sealing starting section 341 may be uniform or uneven. If the thickness of the sealing starting section 341 is uneven, d>t is understood to mean that the length of the sealing starting section 341 is greater than the maximum thickness of the sealing starting section 341 .
  • the electrolyte may flow to the composite interface 321 of the electrode terminal 32 .
  • a small amount of lithium ions in the electrolyte will destroy the surface oxide film of the aluminum part of the electrode terminal 32 during charging.
  • the electrode terminal 32 is easily broken at the composite interface 321. causing the battery cells 10 to short circuit.
  • the length of the sealing starting section 341 is greater than the thickness of the sealing starting section 341 , so that the sealing starting section 341 located upstream of the junction position 322 is longer, and the thicker the sealing starting section 341 is, the thicker the sealing starting section 341 is. , the longer the length of the sealing starting section 341, the sealing ability of the sealing starting section 341 is enhanced, and the flow of the electrolyte from the first housing 1a along the sealing gap 33 to the junction position 322 is reduced to corrode the composite interface 321, causing the electrode
  • the risk of the terminal 32 breaking from the composite interface 321 increases the service life of the end cover assembly 3, thereby increasing the service life of the battery cell 10.
  • seal 34 covers interface location 322 .
  • the sealing initial section 341 is a part of the sealing member 34 .
  • the sealing start section 341 is located upstream of the junction position 322 , and the other parts of the seal 34 except the sealing start section 341 are located downstream of the junction position 322 .
  • the sealing member 34 covers the junction position 322, so that a part of the sealing member 34 is located upstream of the junction position 322 and a part is located downstream of the junction position 322.
  • the sealing member 34 provides a better seal between the electrode terminal 32 and the end cap. As a result, the sealing performance between the electrode terminal 32 and the end cover 31 is improved.
  • the seal 34 occupies the space of the sealing gap 33 at the junction position 322. Even if the sealing of the initial sealing section 341 fails, the electrolyte will not easily accumulate in a large amount at the junction position 322, thereby reducing the risk of the electrolyte corroding the composite interface 321.
  • the seal 34 is located entirely upstream of the interface location 322 in the direction of the seal gap 33 from the inside of the first housing 1 a to the outside of the first housing 1 a.
  • the sealing member 34 is the sealing initial section 341, which can effectively reduce the risk of the electrolyte corroding the composite interface 321 and causing the electrode terminal 32 to break.
  • the electrode terminal 32 includes a first connection part 323 , a second connection part 324 and a third connection part 325 , and the second connection part 324 is disposed in the lead-out hole 311 .
  • the second connecting part 324 is connected to the first connecting part 323 and the third connecting part 325 .
  • the first connection portion 323 and the third connection portion 325 are respectively located on both sides of the end cover 31 in the thickness direction Z.
  • the first connection portion 323 is configured to face the inside of the first housing 1a.
  • the first connection portion 323 and the end cover 31 A first gap 331 is formed between them, a second gap 332 is formed between the second connecting part 324 and the end cover 31 , a third gap 333 is formed between the third connecting part 325 and the end cap 31 , the first gap 331 and the third gap are formed between 333 are connected through the second gap 332 to form the sealing gap 33 .
  • the first connecting part 323 and the second connecting part 324 are connected to form an inverted T-shaped structure, and the third connecting part 325 and the second connecting part 324 are connected to form a T-shaped structure.
  • the second connecting part 324 may be a columnar structure extending through the lead-out hole 311 , and the first connecting part 323 and the third connecting part 325 may be a plate-like structure.
  • a first gap 331 is formed between the first surface 312 and the surface of the first connecting portion 323 facing the end cover 31 .
  • a second gap 332 is formed between the hole wall surface 3111 of the lead-out hole 311 and the outer peripheral surface of the second connecting portion 324 .
  • a third gap 333 is formed between the surface 313 and the surface of the third connecting portion 325 facing the end cover 31 .
  • the second gap 332 is a space in the lead hole 311 that is not occupied by the second connecting portion 324 .
  • the composite interface 321 and the first gap 331 may be connected at the interface position 322 , the composite interface 321 and the second gap 332 may be connected at the interface position 322 , or the composite interface 321 and the third gap 333 may be connected at the interface position 322 .
  • the first connecting part 323 may be divided into two parts, and the composite interface 321 may be formed at the connecting position of the two parts; the composite interface 321 may be formed at the connecting position between the first connecting part 323 and the second connecting part 324; or the composite interface 321 may be formed at the connecting position of the two parts.
  • the second connecting part 324 is divided into two parts, and a composite interface 321 is formed at the connecting position of the two parts; the composite interface 321 may also be formed at the connecting position of the second connecting part 324 and the third connecting part 325; or the third connecting part 325 may be connected.
  • the connection part 325 is divided into two parts, and a composite interface 321 is formed at the connection position of the two parts.
  • the second connection part 324 is inserted into the lead-out hole 311 , and the first connection part 323 and the third connection part 325 are respectively located on both sides of the end cover 31 in the thickness direction Z, realizing the connection between the electrode terminal 32 and The end cap 31 is installed so that the electrode terminal 32 will not be separated from the end cap 31 .
  • the second connection part 324 and the first connection part 323 are made of different materials, and the second connection part 324 and the first connection part 323 are combined to form a composite interface 321 , and the composite interface 321 It is connected to the junction position 322 with the first gap 331 .
  • one of the second connecting part 324 and the first connecting part 323 may be made of copper, and the other may be made of aluminum.
  • the third connecting part 325 is made of the same material as the second connecting part 324 .
  • the third connecting part 325 and the second connecting part 324 can be integrally formed, or they can be provided separately and connected together.
  • the third connecting part 325 is sleeved on the outside of the second connecting part 324.
  • the third connecting part 325 is provided with a mounting hole, and the second connecting part 324 is partially inserted into the mounting hole.
  • the mounting hole is a stepped hole, and the part of the second connecting portion 324 located in the mounting hole is a T-shaped structure.
  • the second connecting portion 324 cooperates with the mounting hole to limit the third connecting portion 325 in the direction away from the end cover 31 Disengage from the second connecting portion 324 .
  • the composite interface 321 is formed at the connection position between the second connection part 324 and the first connection part 323 .
  • the end surface of the second connecting part 324 away from the third connecting part 325 may be combined with the surface of the first connecting part 323 facing the end cap 31 to form a composite interface 321.
  • the composite interface 321 is perpendicular to the end cap.
  • the thickness direction Z of 31; as shown in Figures 5 and 6, the second connecting portion 324 can also be partially extended into the first connecting portion 323.
  • the composite interface 321 is parallel to the thickness direction of the end cover 31 Z.
  • sealing starting section 341 is located upstream of the junction position 322 , it can be understood that the sealing starting section 341 is located within the first gap 331 .
  • connection part 324 and the first connection part 323 are directly combined, which has a simple structure and can reduce the difficulty of combination.
  • a groove 3231 is provided on a side of the first connecting portion 323 facing the end cover 31 .
  • the second connecting part 324 includes a composite part 3241 accommodated in the groove 3231. The outer peripheral surface of the composite part 3241 and the groove side surface of the groove 3231 are combined to form a composite interface 321.
  • the composite part 3241 is the part of the second connecting part 324 located in the groove 3231. Both the composite part 3241 and the groove 3231 may be cylindrical. Along the thickness direction Z of the end cap 31, the groove 3231 is recessed from the first connecting portion 323 toward the surface of the end cap 31 in a direction away from the end cap 31.
  • the composite portion 3241 has a step surface 3241a facing the end cap 31, and the step surface 3241a and The surface of the first connecting portion 323 facing the end cap 31 is flush, and the connection position between the stepped surface 3241a and the surface of the first connecting portion 323 facing the end cap 31 is the interface position 322 .
  • the composite portion 3241 of the second connecting portion 324 is accommodated in the groove 3231 to achieve the positioning fit between the first connecting portion 323 and the second connecting portion 324, thereby increasing the contact area between the first connecting portion 323 and the second connecting portion 324.
  • the solidity of the first connecting part 323 and the second connecting part 324 after being combined is improved.
  • the seal 34 is at least partially located within the first gap 331 and covers the interface location 322 .
  • the entire sealing member 34 may be located in the first gap 331, so that the sealing member 34 covers the interface position 322; or a part of the sealing member 34 may be located in the first gap 331, and the part of the sealing member 34 located in the first gap 331 covers the interface position. 322.
  • the seal 34 is at least partially located within the first gap 331 and covers the interface 322 , which can reduce the risk of the electrolyte corroding the composite interface 321 .
  • the seal 34 includes a first sealing portion 342 and a second sealing portion 343 connected to each other.
  • the first sealing portion 342 is at least partially located within the first gap 331
  • the second sealing portion 343 is connected to each other.
  • the sealing portion 343 is at least partially located within the second gap 332 , and the sealing initial section 341 forms a part of the first sealing portion 342 .
  • the first sealing part 342 and the second sealing part 343 may be an annular structure sleeved on the outside of the second connecting part 324.
  • the first sealing part 342 and the second sealing part 343 may be coaxially arranged.
  • the inner diameter of the first sealing part 342 The outer diameter of the first sealing portion 342 is equal to the inner diameter of the second sealing portion 343 and is larger than the outer diameter of the second sealing portion 343 .
  • the first sealing part 342 and the second sealing part 343 may be integrally formed.
  • the sealing starting section 341 is a part of the first sealing section 342 .
  • the part of the first sealing section 342 except the sealing starting section 341 is connected to the second sealing section 343 .
  • the first sealing section 342 covers the junction position 322 .
  • the first sealing part 342 plays a role in sealing the first connection part 323 and the end cover 31, and the second sealing part 343 plays a role in sealing the second connection part 324 and the end cover 31, thereby improving the efficiency of the electrode terminal. 32 and end cap 31 sealing performance.
  • Figure 7 is a partial view of the end cover assembly 3 provided by some embodiments of the present application
  • Figure 8 is a partial view of the end cover assembly 3 provided by other embodiments of the present application.
  • Figure 9 is a partial view of the end cap assembly 3 provided by some further embodiments of the present application.
  • the second connecting part 324 includes a first section 3242 and a second section 3243 made of different materials.
  • the first section 3242 and the second section 3243 are arranged along the thickness direction Z of the end cover 31.
  • the first section 3242 is connected to the first connecting part 323.
  • the second section 3243 is connected to the third connecting part 325.
  • one end of the first section 3242 facing away from the first connecting part 323 and one end of the second section 3243 facing away from the third connecting part 325 are combined to form a composite interface 321.
  • the composite interface 321 is connected to the second gap 332. Junction location 322.
  • the first section 3242 and the second section 3243 are two parts of the second connecting part 324 made of different materials, and the two parts are combined to form a composite interface 321 .
  • one of the first section 3242 and the second section 3243 may be made of copper, and the other may be made of aluminum.
  • the first connecting part 323 and the first section 3242 are made of the same material, and the third connecting part 325 and the second section 3243 are made of the same material.
  • the composite interface 321 is located in the lead-out hole 311.
  • the composite interface 321 is connected to the outer peripheral surface of the first section 3242 and the second section 3243 at the junction position 322, so that the composite interface 321 and the second gap 332 are connected at the junction position 322.
  • the sealing starting section 341 can be located entirely in the second gap 332; a part of the sealing starting section 341 can also be located in the second gap 332, and the other part is located in the first gap 331. In this case, the sealing starting section 341 The length is equal to the sum of the length of the part of the sealing starting section 341 located in the second gap 332 and the length of the part of the sealing starting section 341 located in the first gap 331 .
  • the measurement can be made along a direction parallel to the first surface 312 of the end cover 31 ; when measuring the length of the sealing starting section 341 located within the second gap 332 The length of the portion can be measured in a direction parallel to the hole wall surface 3111 of the lead-out hole 311 .
  • the composite interface 321 and the second gap 332 are connected at the junction position 322.
  • the electrolyte in the first housing 1a needs to pass through the first gap 331 before entering the second gap 332, which increases the edge of the electrolyte.
  • the flow path from the sealing gap 33 to the junction position 322 further reduces the risk of the composite interface 321 being corroded by the electrolyte.
  • the composite interface 321 is a plane.
  • the end surface of the first section 3242 facing away from the first connecting part 323 is a plane
  • the end surface of the second section 3243 facing away from the third connecting part 325 is also a plane, and the two planes are formed by a combination.
  • the composite interface 321 is a plane, which can reduce the difficulty of composite of the first section 3242 and the second section 3243.
  • the composite interface 321 is an arc surface.
  • the end surface of the first section 3242 facing away from the first connecting part 323 is a circular arc surface
  • the end surface of the second section 3243 facing away from the third connecting part 325 is also a circular arc surface, and both The shapes of the two arc surfaces match each other, and the two arc surfaces are combined to form a composite interface 321.
  • the composite interface 321 is an arc surface, which can increase the contact area of the two composite parts of the electrode terminal 32 and improve the connection strength.
  • the composite interface 321 is a zigzag surface.
  • the end surface of the first section 3242 facing away from the first connecting part 323 is a zigzag surface
  • the end surface of the second section 3243 facing away from the third connecting part 325 is also a zigzag surface, and both ends have a zigzag shape.
  • the shapes of the two zigzag surfaces match each other, and the two zigzag surfaces are combined to form a composite interface 321.
  • the composite interface 321 is a zigzag surface, which can increase the contact area of the two composite parts of the electrode terminal 32 and improve the connection strength.
  • the seal 34 is at least partially located within the second gap 332 and covers the interface location 322 .
  • the entire sealing member 34 may be located in the second gap 332, so that the sealing member 34 covers the junction position 322; or a part of the sealing member 34 may be located in the second gap 332, and the part of the sealing member 34 located in the second sealing gap 33 covers the junction. Location 322. In the case where a part of the sealing member 34 is located in the second gap 332 , a part of the sealing member 34 may be located in the first gap 331 and/or the third gap 333 .
  • the seal 34 is at least partially located within the second gap 332 and covers the interface 322 , which can reduce the risk of the electrolyte corroding the composite interface 321 .
  • the first section 3242 and the first connecting part 323 are integrally formed; and/or the third connecting part 325 is sleeved on the outside of the second section 3243.
  • the first end and the first connecting portion 323 are integrally formed, and the two form an inverted T-shaped structure.
  • the third connecting part 325 is sleeved on both outer sides of the second section 3243 to form a T-shaped structure.
  • the third connecting part 325 is provided with a mounting hole, and the second section 3243 is partially inserted into the mounting hole.
  • the mounting hole is a stepped hole, and the part of the second section 3243 located in the mounting hole is a T-shaped structure.
  • the second section 3243 cooperates with the mounting hole to restrict the third connecting portion 325 from being separated from the third connecting portion 325 in a direction away from the end cover 31 . Section 2 3243.
  • the first section 3242 and the first connecting part 323 are integrally formed, so that the first section 3242 and the first connecting part 323 have good integrity, and the connection strength between the first section 3242 and the first connecting part 323 is improved.
  • the third connecting part 325 is sleeved on the outside of the second section 3243 so that the electrode terminal 32 can be more conveniently installed on the end cover 31 .
  • Figure 10 is a partial view of the end cap assembly 3 provided in some embodiments of the present application
  • Figure 11 is a partial view of the end cover assembly 3 provided in other embodiments of the present application.
  • the third connecting part 325 includes a first socket part 3251 and a second socket part 3252 made of different materials.
  • the first socket part 3251 is socketed on the outside of the second connecting part 324
  • the second socket part 3252 is socketed on the outside of the second connecting part 324.
  • the first socket part 3251 and the second socket part 3252 are two parts of the third connecting part 325 made of different materials.
  • the inner peripheral surface of the second socket part 3252 and the outer peripheral surface of the first socket part 3251 are combined to form a composite interface 321 , the composite interface 321 is connected to the interface position 322 with the surface of the first socket portion 3251 facing the end cap 31 and the surface of the second socket portion 3252 facing the end cap 31 .
  • both the first socket part 3251 and the second socket part 3252 are annular structures
  • the inner peripheral surface of the second socket part 3252 and the outer peripheral surface of the first socket part 3251 are both cylindrical
  • the composite interface 321 is a cylindrical surface parallel to the thickness direction Z of the end cap 31 .
  • first socket part 3251 and the second socket part 3252 may be made of copper, and the other may be made of aluminum.
  • the first socket part 3251, the second connecting part 324 and the first connecting part 323 are made of the same material.
  • the second connecting part 324 and the first connecting part 323 may be integrally formed, or may be provided separately and connected together.
  • the first socket portion 3251 is provided with a mounting hole, and the second connecting portion 324 is inserted into the mounting hole.
  • the mounting hole is a stepped hole, and the part of the second connecting portion 324 located in the mounting hole is a T-shaped structure.
  • the second connecting portion 324 cooperates with the mounting hole to limit the first sleeve portion 3251 along the direction away from the end cover 31 The direction is away from the second connecting portion 324 .
  • the composite interface 321 and the third gap 333 are connected at the junction position 322.
  • the electrolyte in the first housing 1a needs to pass through the first gap 331 and the second gap 332 before it can enter the third gap 333.
  • the path for the electrolyte to flow along the sealing gap 33 to the interface position 322 is enlarged, further reducing the risk of the composite interface 321 being corroded by the electrolyte.
  • the seal 34 is at least partially located within the third gap 333 and covers the interface location 322 .
  • the sealing member 34 may be entirely located within the third gap 333 , so that the sealing member 34 covers the interface position 322 . It is also possible that a part of the sealing member 34 is located in the third gap 333, and the part of the sealing member 34 located in the third gap 333 covers the interface position 322. For example, a part of the sealing member 34 is located in the third gap 333, and a part is located in the second gap 332. , the other part is located in the first gap 331. For example, in FIG. 10 , the seal 34 is entirely located within the third gap 333 .
  • the seal 34 is at least partially located within the third gap 333 and covers the interface 322 , which can reduce the risk of the electrolyte corroding the composite interface 321 .
  • the seal 34 is entirely located in the first gap 331 and/or the second gap 332 . It is achieved that the entirety of the seal 34 is located upstream of the junction location 322 .
  • sealing member 34 is located entirely within the first gap 331 and the second gap 332 , it is understandable that a part of the sealing member 34 is located within the first gap 331 and the other part is located within the second gap 332 .
  • the sealing member 34 is entirely located within the second gap 332 .
  • the second connecting part 324 and the first connecting part 323 are integrally formed. In this way, the second connecting part 324 and the first connecting part 323 have good integrity, and the connection strength between the second connecting part 324 and the first connecting part 323 is improved.
  • the end cap assembly 3 further includes a first insulating member 35 and a second insulating member 36 .
  • the first insulating member 35 is at least partially disposed in the first gap 331 to insulate and isolate the first connecting portion 323 and the end cover 31 .
  • the second insulating member 36 is at least partially disposed in the third gap 333 to insulate and isolate the third connecting portion 325 and the end cover 31 .
  • the first insulating member 35 and the second insulating member 36 are both made of insulating material, such as rubber, plastic, etc.
  • the first insulating member 35 serves to insulate the first connecting portion 323 and the end cover 31
  • the second insulating member 36 serves to insulate the third connecting portion 325 and the end cover 31 .
  • the sealing member 34 abuts the first insulating member 35 and the second insulating member 36 .
  • first connection part 323 and the end cover 31 can be insulated through the first insulating member 35
  • third connection part 325 and the end cover 31 can be insulated through the second insulating member 36 to reduce the risk of short circuit.
  • the end cover 31 is a plate-like structure formed in one piece.
  • the end cap 31 has a single-layer structure.
  • the end cover 31 has a simple structure, and the end cover 31 of this structure can cooperate with a housing 1 .
  • Figure 12 is a schematic structural diagram of the end cover assembly 3 provided in other embodiments of the present application;
  • Figure 13 is a partial enlarged view of the end cover assembly 3 shown in Figure 12 .
  • the end cover 31 includes a stacked first cover 314 and a second cover 315.
  • the lead-out hole 311 penetrates the first cover 314 and the second cover 315.
  • the first cover 314 is used to close the opening of the first housing 1a.
  • the second cover 315 is used to close the opening of the second housing 1b.
  • the end cap 31 has a multi-layer structure.
  • the first cover 314 is a member that closes the opening of the first housing 1a
  • the second cover 315 is a member that closes the opening of the second housing 1b.
  • the surface of the first cover 314 facing away from the second cover 315 is the first surface 312
  • the surface of the second cover 315 facing away from the first cover 314 is the second surface 313.
  • the lead-out hole 311 Through the first surface 312 and the second surface 313. A part of the lead-out hole 311 is located in the first cover 314 and penetrates the first cover 314 , and the other part of the lead-out hole 311 is located in the second cover 315 and penetrates the second cover 315 .
  • the end cover 31 of this structure can cooperate with the two housings 1 to realize that the two housings 1 share one end cover assembly 3 .
  • the end cover 31 further includes a third insulating member 316 .
  • the lead hole 311 penetrates the third insulating member 316 .
  • the third insulating member 316 is stacked on the first cover 314 and the first cover 314 .
  • the first cover 314 and the second cover 315 are insulated between the second covers 315 .
  • the third insulating member 316 is made of insulating material, and the first cover 314 and the second cover 315 can be insulated through the third insulating member 316 .
  • the first cover 314, the third insulator 316 and the second cover 315 are stacked in sequence.
  • a part of the lead-out hole 311 is located in the first cover 314 and penetrates the first cover 314.
  • the other part of the lead-out hole 311 is located in the second cover 315 and penetrates the second cover 315.
  • Another part of the lead-out hole 311 is located in the third insulating member. 316 and penetrates the third insulating member 316 .
  • the embodiment of the present application provides a battery cell 10, which includes a first case 1a, a first electrode assembly 2a, and the end cap assembly 3 provided in any of the above embodiments.
  • the first electrode assembly 2a is accommodated in the first housing 1a.
  • the electrode terminal 32 is electrically connected to the first electrode assembly 2a, and the end cover 31 closes the opening of the first housing 1a.
  • FIG. 14 is a schematic structural diagram of a battery cell 10 provided in other embodiments of the present application.
  • the battery cell 10 also includes a second case 1 b and a second electrode assembly 2 b.
  • the electrode assembly 2b is accommodated in the second housing 1b, and the electrode terminal 32 is electrically connected to the second electrode assembly 2b.
  • the end cover 31 includes a stacked first cover 314 and a second cover 315.
  • the lead-out hole 311 penetrates the first cover 314 and the second cover 315.
  • the first cover 314 is used to close the opening of the first housing 1a.
  • the second cover 315 is used to close the opening of the second housing 1b.
  • the electrode terminal 32 connects the first electrode assembly 2a and the second electrode assembly 2b to achieve electrical connection between the first electrode assembly 2a and the second electrode assembly 2b.
  • the positive electrode tab 21 of the first electrode assembly 2a and the negative electrode tab 22 of the second electrode assembly 2b may be connected through the electrode terminal 32 to realize the series connection of the first electrode assembly 2a and the second electrode assembly 2b.
  • the first insulating member 35 and the second insulating member 36 are provided in the end cap assembly 3
  • the first insulating member 35 can also be used to insulate and isolate the first cover 314 and the first electrode assembly 2a
  • the second insulating member 35 can also be used to insulate and isolate the first cover 314 and the first electrode assembly 2a
  • the member 36 can also be used to insulate and isolate the second cover 315 and the second electrode assembly 2b.
  • the battery cell 10 with the above structure realizes the electrical connection between the two electrode assemblies 2 through an end cover assembly 3, takes up little space, and is conducive to improving the energy density of the battery 100.
  • the end cover 31 further includes a third insulating member 316, the lead hole 311 passes through the third insulating member 316, and the third insulating member 316 is stacked between the first cover 314 and the second cover 315.
  • the first cover 314 and the second cover 315 are insulated.
  • An embodiment of the present application provides a battery 100, including the battery cell 10 provided in any of the above embodiments.
  • An embodiment of the present application provides an electrical device, including the battery 100 provided in any of the above embodiments.

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Abstract

本申请实施例提供了一种端盖组件、电池单体、电池及用电设备。端盖组件包括端盖、电极端子及密封件。端盖设置有引出孔，端盖用于封闭第一壳体的开口。电极端子至少部分穿设于引出孔内，电极端子与端盖之间形成有密封间隙，电极端子具有复合界面，复合界面与密封间隙相连于交界位置。密封件设置于密封间隙内，以密封电极端子和端盖。其中，沿密封间隙从第一壳体的内部通向第一壳体的外部的方向，密封件包括位于交界位置的上游的密封起始段，密封起始段的长度为d，密封起始段的厚度为t，满足：d＞t。这样，降低了电解液从第一壳体内沿着密封间隙流动至交界位置腐蚀复合界面，造成电极端子从复合界面断裂的风险，提升了电池单体的使用寿命。

Description

端盖组件、电池单体、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、电池单体、电池及用电设备。
背景技术
随着新能源技术的发展，电池的应用越来越广泛，例如应用于手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等上。
在电池技术中，既需要考虑电池单体的安全性，也需要考虑电池单体的使用寿命。因此，如何提升电池单体的使用寿命是电池技术中一个亟待解决的技术问题。
发明内容
本申请实施例提供一种端盖组件、电池单体、电池及用电设备件，能够有效提升电池单体的使用寿命。
第一方面，本申请实施例提供一种端盖组件，包括端盖、电极端子及密封件；端盖设置有引出孔，端盖用于封闭第一壳体的开口；电极端子至少部分穿设于引出孔内，电极端子与端盖之间形成有密封间隙，电极端子具有复合界面，复合界面与密封间隙相连于交界位置；密封件设置于密封间隙内，以密封电极端子和端盖；其中，沿密封间隙从第一壳体的内部通向第一壳体的外部的方向，密封件包括位于交界位置的上游的密封起始段，密封起始段的长度为d，密封起始段的厚度为t，满足：d＞t。
在上述技术方案中，密封起始段的长度大于密封起始段的厚度，使得位于交界位置的上游的密封起始段较长，降低了电解液从第一壳体内沿着密封间隙流动至交界位置腐蚀复合界面，造成电极端子从复合界面断裂的风险，提高端盖组件的使用寿命，从而提升了电池单体的使用寿命。
在一些实施例中，密封件覆盖交界位置。使得密封件一部分位于交界位置上游，一部分位于交界位置下游，密封件在电极端子和端盖之间起到更好的密封效果，提高电极端子和端盖之间的密封性能，降低电解液腐蚀复合界面的风险。
在一些实施例中，沿密封间隙从第一壳体的内部通向第一壳体的外部的方向，密封件整***于交界位置的上游。密封件即为密封起始段，能够有效降低电解液腐蚀复合界面而造成电极端子断裂的风险。
在一些实施例中，电极端子包括第一连接部、第二连接部和第三连接部，第二连接部穿设于引出孔内，第二连接部连接于第一连接部和第三连接部；第一连接部和第三连接部分别位于端盖在厚度方向上两侧，第一连接部被配置为面向第一壳体的内部，第一连接部与端盖之间形成第一间隙，第二连接部与端盖之间形成第二间隙，第三连接部与端盖之间形成第三间隙，第一间隙与第三间隙通过第二间隙相连，以形成密封间隙。第二连接部穿设于引出孔内，第一连接部和第三连接部分别位于端盖在厚度方向上的两侧，实现了电极端子与端盖的安装，使得电极端子不会脱离端盖。
在一些实施例中，第二连接部与第一连接部材质不同，且第二连接部与第一连接部复合形成复合界面，复合界面与第一间隙相连于交界位置。第二连接部与第一连接部直接复合，结构简单，能够降低复合难度。
在一些实施例中，沿端盖的厚度方向，第一连接部面向端盖的一侧设置有凹槽；第二连接部包括容纳于凹槽内的复合部，复合部的外周面与凹槽的槽侧面复合形成复合界面。这样，第二连接部的复合部容纳于凹槽内，实现第一连接部和第二连接部的定位配合，增大了第一连接部和第二连接部的接触面积，提高了第一连接部和第二连接部复合后的牢固性。
在一些实施例中，密封件至少部分位于第一间隙内，并覆盖交界位置。这样，能够降低电 解液腐蚀复合界面的风险。
在一些实施例中，密封件包括彼此连接的第一密封部和第二密封部，第一密封部至少部分位于第一间隙内，第二密封部至少部分位于第二间隙内，密封起始段形成第一密封部的一部分。第一密封部起到密封第一连接部和端盖的作用，第二密封部起到密封第二连接部和端盖的作用，提高了电极端子和端盖之间的密封性能。
在一些实施例中，第二连接部包括不同材质的第一段和第二段，第一段与第二段沿端盖的厚度方向设置，第一段连接于第一连接部，第二段连接于第三连接部；沿端盖的厚度方向，第一段背离第一连接部的一端与第二段背离第三连接部的一端复合形成复合界面，复合界面与第二间隙相连于交界位置。这样，增大了电解液沿着密封间隙流动至交界位置的路径，进一步降低复合界面被电解液腐蚀的风险。
在一些实施例中，复合界面为平面、圆弧面或锯齿形面。复合界面为平面能够降低第一段与第二段的复合难度；复合界面为圆弧面或锯齿形面能够增大第一段和第二段的接触面积，提高连接强度。
在一些实施例中，密封件至少部分位于第二间隙内，并覆盖交界位置。这样，能够降低电解液腐蚀复合界面的风险。
在一些实施例中，第一段与第一连接部一体成型；和/或，第三连接部套接于第二段的外侧。第一段与第一连接部一体成型，使得第一段与第一连接部具有很好的整体性，提高第一段与第一连接部的连接强度。第三连接部套接于第二段的外侧，使得电极端子能够更为方便地安装于端盖。
在一些实施例中，第三连接部包括不同材质的第一套接部和第二套接部，第一套接部套接于第二连接部的外侧，第二套接部套接于第一套接部的外侧；其中，第二套接部的内周面与第一套接部的外周面复合形成复合界面，复合界面与第三间隙相连于交界位置。这样，增大了电解液沿着密封间隙流动至交界位置的路径，进一步降低复合界面被电解液腐蚀的风险。
在一些实施例中，密封件至少部分位于第三间隙内，并覆盖交界位置。这样，能够降低电解液腐蚀复合界面的风险。
在一些实施例中，密封件整***于第一间隙和/或第二间隙。实现密封件整***于交界位置的上游。
在一些实施例中，第二连接部与第一连接部一体成型。这样，使得第二连接部与第一连接部具有很好的整体性，提高第二连接部与第一连接部的连接强度。
在一些实施例中，端盖组件还包括第一绝缘件和第二绝缘件；第一绝缘件至少部分设置于第一间隙内，以绝缘隔离第一连接部和端盖；第二绝缘件至少部分设置于第三间隙内，以绝缘隔离第三连接部和端盖。第一绝缘件至少部分设置于第一间隙内，实现第一连接部和端盖绝缘；第二绝缘件至少部分设置于第二间隙内，实现第三连接部与端盖绝缘。
在一些实施例中，端盖为一体成型设置的板状结构。端盖的结构简单，可以与一个壳体配合。
在一些实施例中，端盖包括层叠设置的第一盖体和第二盖体，引出孔贯穿第一盖体和第二盖体，第一盖体用于封闭第一壳体的开口，第二盖体用于封闭第二壳体的开口。这种结构的端盖可以与两个壳体配合，实现两个壳体共用一个端盖组件。
在一些实施例中，端盖还包括第三绝缘件，引出孔贯穿第三绝缘件，第三绝缘件层叠设置于第一盖体和第二盖体之间，以绝缘隔离第一盖体和第二盖体。通过第三绝缘件能够实现第一盖体和第二盖体绝缘。
第二方面，本申请实施例提供一种电池单体，包括第一壳体、第一电极组件及第一方面任意一个实施例提供的端盖组件；第一电极组件容纳于第一壳体内；电极端子与第一电极组件电连接，端盖封闭第一壳体的开口。
在一些实施例中，电池单体还包括第二壳体和第二电极组件，第二电极组件容纳于第二壳体内，电极端子与第二电极组件电连接；端盖包括层叠设置的第一盖体和第二盖体，引出孔贯穿第一盖体和第二盖体，第一盖体用于封闭第一壳体的开口，第二盖体用于封闭第二壳体的开口。
在一些实施例中，端盖还包括第三绝缘件，引出孔贯穿第三绝缘件，第三绝缘件层叠设置于第一盖体和第二盖体之间，以绝缘隔离第一盖体和第二盖体。
第三方面，本申请实施例提供一种电池，包括第二方面任意一个实施例提供的电池单体。
第四方面，本申请实施例提供一种用电设备，包括第三方面任意一个实施例提供的电池。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例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为本申请一些实施例提供的车辆的结构示意图；
图2为本申请一些实施例提供的电池的***图；
图3为本申请一些实施例提供的电池单体的结构示意图；
图4为本申请一些实施例提供的端盖组件的结构示意图；
图5为图4所示的端盖组件A处的局部放大图；
图6为图5所示的端盖组件去除密封件、第一绝缘件和第二绝缘件后的结构示意图；
图7为本申请一些实施例提供的端盖组件的局部视图；
图8为本申请另一些实施例提供的端盖组件的局部视图；
图9为本申请又一些实施例提供的端盖组件的局部视图；
图10为本申请再一些实施例提供的端盖组件的局部视图；
图11为本申请其他实施例提供的端盖组件的局部视图；
图12为本申请另一些实施例提供的端盖组件的结构示意图；
图13为图12所示的端盖组件B处的局部放大图；
图14为本申请另一些实施例提供的电池单体的结构示意图。
图标：1-壳体；1a-第一壳体；1b-第二壳体；2-电极组件；2a-第一电极组件；2b-第二电极组件；21-正极耳；22-负极耳；3-端盖组件；31-端盖；311-引出孔；3111-孔壁面；312-第一表面；313-第二表面；314-第一盖体；315-第二盖体；316-第三绝缘件；32-电极端子；321-复合界面；322-交界位置；323-第一连接部；3231-凹槽；324-第二连接部；3241-复合部；3241a-台阶面；3242-第一段；3243-第二段；325-第三连接部；3251-第一套接部；3252-第二套接部；33-密封间隙；331-第一间隙；332-第二间隙；333-第三间隙；34-密封件；341-密封起始段；342-第一密封部；343-第二密封部；35-第一绝缘件；36-第二绝缘件；10-电池单体；20-箱体；201-第一部分；202-第二部分；100-电池；200-控制器；300-马达；1000-车辆；Z-厚度方向。
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。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。
除非另有定义，本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“附接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
本申请中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件由正极片、负极片和隔离膜组成。电池单体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，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
在电池中，为满足大电流或大电压需求，需要将电池内部的多个电池单体串联、并联或混联在一起。目前，一般通过汇流部件与两个电池单体的电极端子连接，以实现两个电池单体的电连接。电池单体的电极端子与汇流部件相连后，电极端子可以起到连接汇流部件和电极组件的极耳的作用。由于汇流部件的材质和电极组件的极耳的材质一般不同，为保证电极端子与汇流部件以及电极组件的极耳焊接后的牢固性，可以将电极端子设置为复合结构，电极端子分为材质不同的两部分，两部分复合在一起，电极端子中与极耳的材质相同的一部分可以用于与极耳焊接，电极端子中与汇流部件的材质相同的一部分可以用于与汇流部件焊接。
为方便引出电极端子，端盖上设置有引出孔，以通过引出孔引出电极端子。为保证电池单体的密封性，需要在电极端子与端盖之间设置密封件，以避免电解液通过引出孔泄露至电池单体的 外部。
发明人注意到，在电极端子为复合结构的电池单体中，当电池单体处于振动或冲击环境中时，电极端子容易在两部分的复合界面断裂。
发明人进一步研究发现，电极端子穿设于端盖的引出孔后，电极端子与端盖之间形成密封间隙，密封件设置于密封间隙内，电极端子的复合界面与密封间隙相连于交界位置。虽然电极端子与端盖之间设置有密封件，密封件被挤压在电极端子和端盖之间内，密封件与电极端子的接触应力并不均匀，密封件沿密封间隙越靠近电池单体内部的位置与电极端子接触越不紧密，且密封件的厚度越后，密封件与电极端子接触不紧密的部分的长度就越长，密封件位于交界位置上游的部分的长度不足，则会导致电解液沿着密封件与电极端子之间的小间隙流动至电极端子的复合界面，电解液腐蚀复合界面，造成电极端子在复合界面的位置的强度降低，当电池单体处于振动或冲击环境中时，电极端子容易在两部分的复合界面断裂，引起电池单体断路，影响电池单体的使用寿命。
鉴于此，本申请实施例提供一种端盖组件，将密封件位于交界位置的上游的密封起始段的长度设置为大于密封起始段的厚度。
在这样的端盖组件中，密封起始段的长度大于密封起始段的厚度，使得位于交界位置的上游的密封起始段较长，且密封起始段的厚度越厚，密封起始段的长度越长，降低了电解液从第一壳体内沿着密封间隙流动至交界位置腐蚀复合界面，造成电极端子从复合界面断裂的风险，提高端盖组件的使用寿命，从而提升了电池单体的使用寿命。
本申请实施例描述的技术方案适用于电池以及使用电池的用电设备。
用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、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；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具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；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
以下实施例为了方便说明，以用电设备为车辆为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。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2，图2为本申请一些实施例提供的电池100的***图，电池100可以包括电池单体10和箱体20，电池单体10容纳于箱体20内。
其中，箱体20是容纳电池单体10的部件，箱体20为电池单体10提供容纳空间，箱体20可以采用多种结构。在一些实施例中，箱体20可以包括第一部分201和第二部分202，第一部分201与第二部分202相互盖合，以限定出用于容纳电池单体10的容纳空间。第一部分201和第二部分202可以是多种形状，比如，长方体、圆柱体等。第一部分201可以是一侧开放的空心结构，第二部分202也可以是一侧开放的空心结构，第二部分202的开放侧盖合于第一部分201的开放侧，则形成具有容纳空间的箱体20。也可以是第一部分201为一侧开放的空心结构，第二部分202为板状结构，第二部分202盖合于第一部分201的开放侧，则形成具有容纳空间的箱体20。第一部分201与第二部分202可以通过密封元件来实现密封，密封元件可以是密封圈、密封胶等。
在电池100中，电池单体10可以是一个、也可以是多个。若电池单体10为多个，多个电 池单体10之间可串联或并联或混联，混联是指多个电池单体10中既有串联又有并联。可以是多个电池单体10先串联或并联或混联组成电池模块，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体20内。也可以是所有电池单体10之间直接串联或并联或混联在一起，再将所有电池单体10构成的整体容纳于箱体20内。
在一些实施例中，电池100还可以包括汇流部件，多个电池单体10之间可通过汇流部件实现电连接，以实现多个电池单体10的串联或并联或混联。汇流部件可以是金属导体，比如，铜、铁、铝、不锈钢、铝合金等。
请参照图3，图3为本申请一些实施例提供的电池单体10的结构示意图。电池单体10可以包括壳体1、电极组件2和端盖组件3。
壳体1是用于容纳电极组件2的部件，壳体1可以是一端形成开口的空心结构，壳体1可以是相对的两端形成开口的空心结构。壳体1可以是多种形状，比如，圆柱体、长方体等。壳体1的材质可以是多种，比如，铜、铁、铝、钢、铝合金等。
电极组件2是电池单体10中发生电化学反应的部件。电极组件2可以包括正极片、负极片和隔离膜。电极组件2可以是由正极片、隔离膜和负极片通过卷绕形成的卷绕式结构，也可以是由正极片、隔离膜和负极片通过层叠布置形成的叠片式结构。电极组件2具有极耳，极耳分为正极耳21和负极耳22，正极耳21可以是正极片上未涂覆正极活性物质层的部分，负极耳22可以是负极片上未涂覆负极活性物质层的部分。
端盖组件3是盖合于壳体1的开口以将电池单体10的内部环境与外部环境隔绝的部件。在电池单体10中，端盖组件3可以是一个，也可以是两个。在壳体1为一端形成开口的空心结构的实施例中，端盖组件3可以是一个，一个端盖组件3对应封闭壳体1的一个开口；在壳体1为两端形成开口的空心结构的实施例中，端盖组件3可以是两个，两个端盖组件3分别封闭壳体1的两个开口。端盖组件3中设置有电极端子32，用于与电极组件2的极耳电连接，以输出或输入电能。以电池单体10中设置有两个端盖组件3为例，一个端盖组件3的电极端子32可以与电极组件2的正极耳21电连接，另一个端盖组件3的电极端子32可以与电极组件2的负极耳22电连接。
以下结合附图对端盖组件3的具体结构进行详细阐述。
请参照图4-图6，图4为本申请一些实施例提供的端盖组件3的结构示意图；图5为图4所示的端盖组件3处的局部放大图；图6为图5所示的端盖组件3去除密封件34、第一绝缘件35和第二绝缘件36后的结构示意图。本申请实施例提供一种端盖组件3，包括端盖31、电极端子32及密封件34。端盖31设置有引出孔311，端盖31用于封闭第一壳体1a(图3中示出)的开口。电极端子32至少部分穿设于引出孔311内，电极端子32与端盖31之间形成有密封间隙33，电极端子32具有复合界面321，复合界面321与密封间隙33相连于交界位置322。密封件34设置于密封间隙33内，以密封电极端子32和端盖31。其中，沿密封间隙33从第一壳体1a的内部通向第一壳体1a的外部的方向，密封件34包括位于交界位置322的上游的密封起始段341，密封起始段341的长度为d，密封起始段341的厚度为t，满足：d＞t。
端盖31是封闭第一壳体1a的开口，以将电池单体10的内部环境与外部环境隔绝的部件。端盖31可以是单层结构，也可以是多层结构。引出孔311为设置于端盖31上通孔，用于将电极端子32从端盖31的内侧引出至端盖31的外侧。端盖31的内侧即为端盖31面向第一壳体1a的一侧，端盖31的外侧即为端盖31背离第一壳体1a的一侧。
电极端子32是用于输出或输入电能的部件，电极端子32用于与电极组件2的极耳电连接。电极端子32可以部分位于引出孔311内，也可以整***于引出孔311内。示例性的，在图5中，电极端子32一部分位于引出孔311内，一部分位于端盖31的内侧，以便于电极端子32与极耳电连接，一部分位于端盖31的外侧，以便于电极端子32与外部部件连接，比如，汇流部件。
电极端子32具有材料不同的两部分，该两部分复合在一起，并在连接位置形成复合界面321。该两部分复合后固定在一起，两者可以通过摩擦焊的方式复合在一起。示例性的，一部分的材质为铜，另一部分的材质为铝。
电极端子32穿设于引出孔311内后，电极端子32与端盖31之间形成密封间隙33。如图6所示，沿端盖31的厚度方向Z，端盖31具有相对的第一表面312和第二表面313，引出孔311贯穿第一表面312和第二表面313，第一表面312面向第一壳体1a(图3中示出)的内部，引出孔311的孔壁面3111连接第一表面312、第二表面313。第一表面312、孔壁面3111和第二表面313形成端盖31的第一接触面，电极端子32与第一接触面相对的表面为第二接触面，第二接触面与第一接触面之间形成密封间隙33。若电极端子32只有与孔壁面3111相对的表面，该表面与孔壁面3111之间则形成密封间隙33；若电极端子32具有与第一表面312、孔壁面3111和第二表面313相对的表面，则该表面与第一接触面之间则形成密封间隙33。
复合界面321与密封间隙33相连于交界位置322，可理解的，交界位置322为复合界面321与第二接触面相交的位置。比如，电极端子32与第二表面313相对的表面与复合界面321相连于交界位置322；再如，电极端子32与孔壁面3111相对的表面与复合界面321相连于交界位置322；再如，如图6所示，电极端子32与第一表面312相对的表面与复合界面321相连于交界位置322。
在图6中，为方便叙述，将沿密封间隙33从第一壳体1a的内部通向第一壳体1a的外部的方向定义为第一方向(图6中密封间隙33内的箭头方向)，第一方向也可以理解为电解液从第一壳体1a的内部经过密封间隙33向第一壳体1a的外部流动的方向。
密封件34可以是压缩模量小于1Gpa的弹性体。密封件34的材质可以是塑料、橡胶或塑料和橡胶的混合物。其中，塑料可以是PP(Polypropylene，聚丙烯)、PE(polyethylene，聚乙烯)、PFA(Polyfluoroalkoxy，四氟乙烯—全氟烷氧基乙烯基醚共聚物)、PET(Polyethylene terephthalate，聚对苯二甲酸乙二醇酯)、PBT(Polybutylene terephthalate，聚对苯二甲酸丁二醇酯)、FEP(Fluorinated ethylene propylene，氟化乙烯丙烯共聚物)等；橡胶可以是NBR(Nitrile Butadiene Rubber，丁腈橡胶)、FKM(Fluororubber，氟橡胶)等。
密封起始段341为密封件34沿第一方向位于交界位置322的上游的部分，密封件34可以局部位于交界位置322的上游，也可以整***于交界位置322的上游。密封起始段341的长度为密封起始段341沿第一方向延伸的长度，密封起始段341的厚度垂直于第一方向，密封起始段341的厚度可以沿着密封间隙33的宽度方向测得。密封起始段341的厚度可以是均匀的，也可以是不均匀的。若密封起始段341的厚度不均匀，d＞t理解为，密封起始段341的长度大于密封起始段341的最大厚度。
对于一般的端盖组件3而言，存在密封件34位于交界位置322上游的部分的长度不足的情况，导致电解液可能会流动至电极端子32的复合界面321。以电极端子32复合在一起的两部分分别位于铜和铝为例，两部分复合在一起形成铜铝复合界面，电解液中的少量锂离子在充电时会破坏电极端子32的铝部分表面氧化膜并嵌入铝金属晶体结构间隙，形成疏松状的Al-Li合金，从而腐蚀复合界面321，降低了电极端子32复合位置的强度，在振动或冲击环境中，电极端子32容易在复合界面321断裂，引起电池单体10短路。
而在本申请实施例中，密封起始段341的长度大于密封起始段341的厚度，使得位于交界位置322的上游的密封起始段341较长，且密封起始段341的厚度越厚，密封起始段341的长度越长，增强了密封起始段341的密封能力，降低了电解液从第一壳体1a内沿着密封间隙33流动至交界位置322腐蚀复合界面321，造成电极端子32从复合界面321断裂的风险，提高端盖组件3的使用寿命，从而提升了电池单体10的使用寿命。
在一些实施例中，请参照图5，密封件34覆盖交界位置322。
在本实施例中，密封起始段341为密封件34的一部分。密封起始段341位于交界位置322的上游，密封件34除了密封起始段341的其他部分位于交界位置322的下游。
在本实施例中，密封件34覆盖交界位置322，使得密封件34一部分位于交界位置322上游，一部分位于交界位置322下游，密封件34在电极端子32和端盖之间起到更好的密封效果，提高电极端子32和端盖31之间的密封性能。密封件34占用了密封间隙33位于交界位置322的空间，即使密封起始段341密封失效，电解液也不易在交界位置322大量堆积，从而降低电解液腐蚀 复合界面321的风险。
在一些实施例中，沿密封间隙33从第一壳体1a的内部通向第一壳体1a的外部的方向，密封件34整***于交界位置322的上游。密封件34即为密封起始段341，能够有效降低电解液腐蚀复合界面321而造成电极端子32断裂的风险。
在一些实施例中，请继续参照图5和图6，电极端子32包括第一连接部323、第二连接部324和第三连接部325，第二连接部324穿设于引出孔311内，第二连接部324连接于第一连接部323和第三连接部325。第一连接部323和第三连接部325分别位于端盖31在厚度方向Z上两侧，第一连接部323被配置为面向第一壳体1a的内部，第一连接部323与端盖31之间形成第一间隙331，第二连接部324与端盖31之间形成第二间隙332，第三连接部325与端盖31之间形成第三间隙333，第一间隙331与第三间隙333通过第二间隙332相连，以形成密封间隙33。
第一连接部323与第二连接部324连接形成倒T形结构，第三连接部325与第二连接部324连接形成T形结构。第二连接部324可以是穿设于引出孔311的柱状结构，第一连接部323和第三连接部325可以是板状结构。其中，在端盖31封闭第一壳体1a的开口时，第一连接部323面向第一壳体1a的内部，第一连接部323位于端盖31的内侧，第二连接部324位于端盖31的外侧。沿密封间隙33从第一壳体1a的内部通向第一壳体1a的外部的方向，第一间隙331、第二间隙332和第三间隙333依次连通。第一表面312与第一连接部323面向端盖31的表面之间形成第一间隙331，引出孔311的孔壁面3111与第二连接部324的外周面之间形成第二间隙332，第二表面313与第三连接部325面向端盖31的表面之间形成第三间隙333。其中，第二间隙332为引出孔311未被第二连接部324占用的空间。
可以是复合界面321与第一间隙331相连于交界位置322，也可以是复合界面321与第二间隙332相连于交界位置322，也可以是复合界面321与第三间隙333相连于交界位置322。可以是将第一连接部323分为两部分，在该两部分连接位置形成复合界面321；也可以是在第一连接部323与第二连接部324连接位置形成复合界面321；也可以是将第二连接部324分为两部分，在该两部分连接位置形成复合界面321；也可以是在第二连接部324和第三连接部325的连接位置形成复合界面321；也可以是将第三连接部325分为两部分，在该两部分连接位置形成复合界面321。
在本实施例中，第二连接部324穿设于引出孔311内，第一连接部323和第三连接部325分别位于端盖31在厚度方向Z上的两侧，实现了电极端子32与端盖31的安装，使得电极端子32不会脱离端盖31。
在一些实施例中，请继续参照图5和图6，第二连接部324与第一连接部323材质不同，且第二连接部324与第一连接部323复合形成复合界面321，复合界面321与第一间隙331相连于交界位置322。
示例性的，第二连接部324和第一连接部323中的一者可以是铜材质，另一者可以是铝材质。
第三连接部325的材质与第二连接部324的材质相同。第三连接部325与第二连接部324可以一体成型，也可以分体设置并连接在一起，比如，如图5和图6，第三连接部325套设于第二连接部324的外侧，第三连接部325设置有安装孔，第二连接部324局部穿设于安装孔内。示例性的，安装孔为阶梯孔，第二连接部324位于安装孔内的部分为T形结构，第二连接部324与安装孔配合，以限制第三连接部325沿背离端盖31的方向脱离第二连接部324。
复合界面321形成于第二连接部324与第一连接部323的连接位置。可以是第二连接部324远离第三连接部325的一端的端面与第一连接部323面向端盖31的表面复合在一起形成复合界面321，在这种情况下，复合界面321垂直于端盖31的厚度方向Z；如图5和图6所示，也可以是第二连接部324局部延伸至第一连接部323内，在这种情况下，复合界面321平行于端盖31的厚度方向Z。
由于密封起始段341位于交界位置322的上游，可理解的，密封起始段341位于第一间隙331内。
在本实施例中，第二连接部324与第一连接部323直接复合，结构简单，能够降低复合难度。
在一些实施例中，请继续参照图5和图6，沿端盖31的厚度方向Z，第一连接部323面向端盖31的一侧设置有凹槽3231。第二连接部324包括容纳于凹槽3231内的复合部3241，复合部3241的外周面与凹槽3231的槽侧面复合形成复合界面321。
复合部3241为第二连接部324位于凹槽3231内的部分。复合部3241和凹槽3231均可以呈圆柱状。沿端盖31的厚度方向Z，凹槽3231从第一连接部323面向端盖31的表面向背离端盖31的方向凹陷，复合部3241具有面向端盖31的台阶面3241a，台阶面3241a与第一连接部323面向端盖31的表面平齐，台阶面3241a与第一连接部323面向端盖31的表面的连接位置即为交界位置322。
第二连接部324的复合部3241容纳于凹槽3231内，实现第一连接部323和第二连接部324的定位配合，增大了第一连接部323和第二连接部324的接触面积，提高了第一连接部323和第二连接部324复合后的牢固性。
在一些实施例中，请继续参照图5和图6，密封件34至少部分位于第一间隙331内，并覆盖交界位置322。
可以是密封件34整***于第一间隙331内，实现密封件34覆盖交界位置322；也可以是密封件34一部分位于第一间隙331内，密封件34位于第一间隙331内的部分覆盖交界位置322。
在本实施例中，密封件34至少部分位于第一间隙331内并覆盖交界位置322，能够降低电解液腐蚀复合界面321的风险。
在一些实施例中，请继续参照图5和图6，密封件34包括彼此连接的第一密封部342和第二密封部343，第一密封部342至少部分位于第一间隙331内，第二密封部343至少部分位于第二间隙332内，密封起始段341形成第一密封部342的一部分。
第一密封部342和第二密封部343可以是套设于第二连接部324的外侧的环形结构，第一密封部342和第二密封部343可以同轴设置，第一密封部342的内径与第二密封部343的内径相等，第一密封部342的外径大于第二密封部343的外径。第一密封部342和第二密封部343可以一体成型。
密封起始段341为第一密封部342的一部分，第一密封部342除密封起始段341以外的部分连接第二密封部343，第一密封部342覆盖交界位置322。
在本实施例中，第一密封部342起到密封第一连接部323和端盖31的作用，第二密封部343起到密封第二连接部324和端盖31的作用，提高了电极端子32和端盖31之间的密封性能。
在一些实施例中，请参照图7-图9，图7为本申请一些实施例提供的端盖组件3的局部视图；图8为本申请另一些实施例提供的端盖组件3的局部视图；图9为本申请又一些实施例提供的端盖组件3的局部视图。第二连接部324包括不同材质的第一段3242和第二段3243，第一段3242与第二段3243沿端盖31的厚度方向Z设置，第一段3242连接于第一连接部323，第二段3243连接于第三连接部325。沿端盖31的厚度方向Z，第一段3242背离第一连接部323的一端与第二段3243背离第三连接部325的一端复合形成复合界面321，复合界面321与第二间隙332相连于交界位置322。
第一段3242和第二段3243为第二连接部324材质不同的两部分，该两部分复合形成复合界面321。示例性的，第一段3242和第二段3243中的一者可以是铜材质，另一者可以是铝材质。第一连接部323与第一段3242的材质相同，第三连接部325与第二段3243的材质相同。
复合界面321位于引出孔311内，复合界面321与第一段3242的外周面以及第二段3243的外周面相连于交界位置322，实现复合界面321与第二间隙332相连于交界位置322。密封起始段341可以整***于第二间隙332内；密封起始段341也可以一部分位于第二间隙332内，另一部分位于第一间隙331内，在这种情况下，密封起始段341的长度等于密封起始段341位于第二间隙 332内的部分的长度与密封起始段341位于第一间隙331内的部分的长度之和。在测量密封起始段341位于第一间隙331内的部分的长度时，可以沿着平行于端盖31的第一表面312的方向进行测量；在测量密封起始段341位于第二间隙332内的部分的长度时，可以沿着平行于引出孔311的孔壁面3111的方向进行测量。
在本实施例中，复合界面321与第二间隙332相连于交界位置322，第一壳体1a内的电解液需要经过第一间隙331才能进入到第二间隙332内，增大了电解液沿着密封间隙33流动至交界位置322的路径，进一步降低复合界面321被电解液腐蚀的风险。
在一些实施例中，请参照图7，复合界面321为平面。
沿端盖31的厚度方向Z，第一段3242背离第一连接部323的一端的端面为平面，第二段3243背离第三连接部325的一端的端面也为平面，且两个平面复合形成复合界面321。
在本实施例中，复合界面321为平面，能够降低第一段3242和第二段3243的复合难度。
在一些实施例中，请参照图8，复合界面321为圆弧面。
沿端盖31的厚度方向Z，第一段3242背离第一连接部323的一端的端面为圆弧面，第二段3243背离第三连接部325的一端的端面也为圆弧面，且两个圆弧面的形状相契合，两个圆弧面复合形成复合界面321。
在本实施例中，复合界面321为圆弧面，能够增大电极端子32复合的两部分的接触面积，提高连接强度。
在一些实施例中，如图9所示，复合界面321为锯齿形面。
沿端盖31的厚度方向Z，第一段3242背离第一连接部323的一端的端面为锯齿形面，第二段3243背离第三连接部325的一端的端面也为锯齿形面，且两个锯齿形面的形状相契合，两个锯齿形面复合形成复合界面321。
在本实施例中，复合界面321为锯齿形面，能够增大电极端子32复合的两部分的接触面积，提高连接强度。
在一些实施例中，请参照图7-图9，密封件34至少部分位于第二间隙332内，并覆盖交界位置322。
可以是密封件34整***于第二间隙332内，实现密封件34覆盖交界位置322；也可以是密封件34一部分位于第二间隙332内，密封件34位于第二密封间隙33内的部分覆盖交界位置322。在密封件34一部分位于第二间隙332内的情况下，密封件34可以还有一部分位于第一间隙331和/或第三间隙333内。
在本实施例中，密封件34至少部分位于第二间隙332内并覆盖交界位置322，能够降低电解液腐蚀复合界面321的风险。
在一些实施例中，请参照图7-图9，第一段3242与第一连接部323一体成型；和/或，第三连接部325套接于第二段3243的外侧。
第一端与第一连接部323一体成型，两者形成倒T形结构。第三连接部325套设于第二段3243的外侧两者形成T形结构。第三连接部325设置有安装孔，第二段3243局部穿设于安装孔内。示例性的，安装孔为阶梯孔，第二段3243位于安装孔内的部分为T形结构，第二段3243与安装孔配合，以限制第三连接部325沿背离端盖31的方向脱离第二段3243。
第一段3242与第一连接部323一体成型，使得第一段3242与第一连接部323具有很好的整体性，提高第一段3242与第一连接部323的连接强度。第三连接部325套接于第二段3243的外侧，使得电极端子32能够更为方便地安装于端盖31。
在一些实施例中，请参照图10和图11，图10为本申请再一些实施例提供的端盖组件3的局部视图；图11为本申请其他实施例提供的端盖组件3的局部视图。第三连接部325包括不同材质的第一套接部3251和第二套接部3252，第一套接部3251套接于第二连接部324的外侧，第 二套接部3252套接于第一套接部3251的外侧；其中，第二套接部3252的内周面与第一套接部3251的外周面复合形成复合界面321，复合界面321与第三间隙333相连于交界位置322。
第一套接部3251和第二套接部3252为第三连接部325材质不同的两部分，第二套接部3252的内周面与第一套接部3251的外周面复合形成复合界面321，复合界面321与第一套接部3251面向端盖31的表面以及第二套接部3252面向端盖31的表面相连于交界位置322。示例性的，第一套接部3251和第二套接部3252均为环形结构，第二套接部3252的内周面和第一套接部3251的外周面均为圆柱形，复合界面321为平行于端盖31的厚度方向Z的圆柱面。第一套接部3251和第二套接部3252一者可以是铜材质，另一者可以是铝材质。第一套接部3251、第二连接部324及第一连接部323三者的材质相同。第二连接部324与第一连接部323可以一体成型，也可以分体设置并连接在一起。
其中，第一套接部3251设置有安装孔，第二连接部324穿设于安装孔内。示例性的，安装孔为阶梯孔，第二连接部324位于安装孔内的部分为T形结构，第二连接部324与安装孔配合，以限制第一套接部3251沿背离端盖31的方向脱离第二连接部324。
在本实施例中，复合界面321与第三间隙333相连于交界位置322，第一壳体1a内的电解液需要经过第一间隙331、第二间隙332才能够进入到第三间隙333，增大了电解液沿着密封间隙33流动至交界位置322的路径，进一步降低复合界面321被电解液腐蚀的风险。
在一些实施例中，请参照图10，密封件34至少部分位于第三间隙333内，并覆盖交界位置322。
可以是密封件34整***于第三间隙333内，实现密封件34覆盖交界位置322。也可以是密封件34一部分位于第三间隙333内，密封件34位于第三间隙333内的部分覆盖交界位置322，比如，密封件34一部分位于第三间隙333内，一部分位于第二间隙332内，另一部分位于第一间隙331内。示例性的，在图10中，密封件34整***于第三间隙333内。
在本实施例中，密封件34至少部分位于第三间隙333内并覆盖交界位置322，能够降低电解液腐蚀复合界面321的风险。
在一些实施例中，密封件34整***于第一间隙331和/或第二间隙332。实现密封件34整***于交界位置322的上游。
若密封件34整***于第一间隙331和第二间隙332内，可理解的，密封件34一部分位于第一间隙331内，另一部分位于第二间隙332内。
示例性的，如图11所示，密封件34整***于第二间隙332内。
在一些实施例中，请参照图10和图11，第二连接部324与第一连接部323一体成型。这样，使得第二连接部324与第一连接部323具有很好的整体性，提高第二连接部324与第一连接部323的连接强度。
在一些实施例中，请参照图5-图11，端盖组件3还包括第一绝缘件35和第二绝缘件36。第一绝缘件35至少部分设置于第一间隙331内，以绝缘隔离第一连接部323和端盖31。第二绝缘件36至少部分设置于第三间隙333内，以绝缘隔离第三连接部325和端盖31。
第一绝缘件35和第二绝缘件36均为绝缘材质，比如，橡胶、塑料等。第一绝缘件35起到绝缘第一连接部323和端盖31的作用，第二绝缘件36起到绝缘第三连接部325和端盖31的作用。示例性的，密封件34抵接于第一绝缘件35和第二绝缘件36。
在本实施例中，通过第一绝缘件35能够实现第一连接部323和端盖31绝缘，通过第二绝缘件36能够实现第三连接部325与端盖31绝缘，以降低短路的风险。
在一些实施例中，请参照图5-图11，端盖31为一体成型设置的板状结构。
可理解的，端盖31为单层结构。
在本实施例中，端盖31的结构简单，这种结构的端盖31可以与一个壳体1配合。
在一些实施例中，请参照图12和图13，图12为本申请另一些实施例提供的端盖组件3的结构示意图；图13为图12所示的端盖组件3处的局部放大图。端盖31包括层叠设置的第一盖体314和第二盖体315，引出孔311贯穿第一盖体314和第二盖体315，第一盖体314用于封闭第一壳体1a的开口，第二盖体315用于封闭第二壳体1b的开口。
在本实施例中，端盖31为多层结构。第一盖体314为封闭第一壳体1a的开口的部件，第二盖体315为封闭第二壳体1b的开口的部件。沿端盖31的厚度方向Z，第一盖体314背离第二盖体315的表面为第一表面312，第二盖体315背离第一盖体314的表面为第二表面313，引出孔311贯穿第一表面312和第二表面313。引出孔311一部分位于第一盖体314并贯穿第一盖体314，引出孔311的另一部分位于第二盖体315并贯穿第二盖体315。
在本实施例中，这种结构的端盖31可以与两个壳体1配合，实现两个壳体1共用一个端盖组件3。
在一些实施例中，请继续参照图12和图13，端盖31还包括第三绝缘件316，引出孔311贯穿第三绝缘件316，第三绝缘件316层叠设置于第一盖体314和第二盖体315之间，以绝缘隔离第一盖体314和第二盖体315。
第三绝缘件316为绝缘材质，通过第三绝缘件316能够实现第一盖体314和第二盖体315绝缘。第一盖体314、第三绝缘件316和第二盖体315依次层叠设置。引出孔311的一部分位于第一盖体314并贯穿第一盖体314，引出孔311的另一部分位于第二盖体315并贯穿第二盖体315，引出孔311还有一部分位于第三绝缘件316并贯穿第三绝缘件316。
本申请实施例提供一种电池单体10，包括第一壳体1a、第一电极组件2a及上述任意一个实施例提供的端盖组件3。第一电极组件2a容纳于第一壳体1a内。电极端子32与第一电极组件2a电连接，端盖31封闭第一壳体1a的开口。
在一些实施例中，请参照图14，图14为本申请另一些实施例提供的电池单体10的结构示意图，电池单体10还包括第二壳体1b和第二电极组件2b，第二电极组件2b容纳于第二壳体1b内，电极端子32与第二电极组件2b电连接。端盖31包括层叠设置的第一盖体314和第二盖体315，引出孔311贯穿第一盖体314和第二盖体315，第一盖体314用于封闭第一壳体1a的开口，第二盖体315用于封闭第二壳体1b的开口。
电极端子32连接第一电极组件2a和第二电极组件2b，以实现第一电极组件2a和第二电极组件2b电连接。可以是第一电极组件2a的正极耳21和第二电极组件2b的负极耳22通过电极端子32连接，以实现第一电极组件2a和第二电极组件2b串联。
在端盖组件3中设置有第一绝缘件35和第二绝缘件36的实施例中，第一绝缘件35还可以用于绝缘隔离第一盖体314和第一电极组件2a，第二绝缘件36还可以用于绝缘隔离第二盖体315和第二电极组件2b。
具有上述结构的电池单体10通过一个端盖组件3实现了两个电极组件2的电连接，占用空间小，有利于提升电池100的能量密度。
在一些实施例中，端盖31还包括第三绝缘件316，引出孔311贯穿第三绝缘件316，第三绝缘件316层叠设置于第一盖体314和第二盖体315之间，以绝缘隔离第一盖体314和第二盖体315。
本申请实施例提供一种电池100，包括上述任意一个实施例提供的电池单体10。
本申请实施例提供一种用电设备，包括上述任意一个实施例提供的电池100。
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。
以上实施例仅用以说明本申请的技术方案，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 (25)

  1. 一种端盖组件，包括：
    端盖，设置有引出孔，所述端盖用于封闭第一壳体的开口；
    电极端子，至少部分穿设于所述引出孔内，所述电极端子与所述端盖之间形成有密封间隙，所述电极端子具有复合界面，所述复合界面与所述密封间隙相连于交界位置；
    密封件，设置于所述密封间隙内，以密封所述电极端子和所述端盖；
    其中，沿所述密封间隙从所述第一壳体的内部通向所述第一壳体的外部的方向，所述密封件包括位于所述交界位置的上游的密封起始段，所述密封起始段的长度为d，所述密封起始段的厚度为t，满足：d＞t。
  2. 根据权利要求1所述的端盖组件，其中，所述密封件覆盖所述交界位置。
  3. 根据权利要求1所述的端盖组件，其中，沿所述密封间隙从所述第一壳体的内部通向所述第一壳体的外部的方向，所述密封件整***于所述交界位置的上游。
  4. 根据权利要求1-3任一项所述的端盖组件，其中，所述电极端子包括第一连接部、第二连接部和第三连接部，所述第二连接部穿设于所述引出孔内，所述第二连接部连接于所述第一连接部和第三连接部；
    所述第一连接部和所述第三连接部分别位于所述端盖在厚度方向上两侧，所述第一连接部被配置为面向所述第一壳体的内部，所述第一连接部与所述端盖之间形成第一间隙，所述第二连接部与所述端盖之间形成第二间隙，所述第三连接部与所述端盖之间形成第三间隙，所述第一间隙与所述第三间隙通过所述第二间隙相连，以形成所述密封间隙。
  5. 根据权利要求4所述的端盖组件，其中，所述第二连接部与所述第一连接部材质不同，且所述第二连接部与所述第一连接部复合形成所述复合界面，所述复合界面与所述第一间隙相连于所述交界位置。
  6. 根据权利要求5所述的端盖组件，其中，沿所述端盖的厚度方向，所述第一连接部面向所述端盖的一侧设置有凹槽；
    所述第二连接部包括容纳于所述凹槽内的复合部，所述复合部的外周面与所述凹槽的槽侧面复合形成所述复合界面。
  7. 根据权利要求5或6所述的端盖组件，其中，所述密封件至少部分位于所述第一间隙内，并覆盖所述交界位置。
  8. 根据权利要求5-7任一项所述的端盖组件，其中，所述密封件包括彼此连接的第一密封部和第二密封部，所述第一密封部至少部分位于所述第一间隙内，所述第二密封部至少部分位于所述第二间隙内，所述密封起始段形成所述第一密封部的一部分。
  9. 根据权利要求4所述的端盖组件，其中，所述第二连接部包括不同材质的第一段和第二段，所述第一段与所述第二段沿所述端盖的厚度方向设置，所述第一段连接于所述第一连接部，所述第二段连接于所述第三连接部；
    沿所述端盖的厚度方向，所述第一段背离所述第一连接部的一端与所述第二段背离所述第三连接部的一端复合形成所述复合界面，所述复合界面与所述第二间隙相连于所述交界位置。
  10. 根据权利要求9所述的端盖组件，其中，所述复合界面为平面、圆弧面或锯齿形面。
  11. 根据权利要求9或10所述的端盖组件，其中，所述密封件至少部分位于所述第二间隙内，并覆盖所述交界位置。
  12. 根据权利要求9-11任一项所述的端盖组件，其中，所述第一段与所述第一连接部一体成型；和/或，所述第三连接部套接于所述第二段的外侧。
  13. 根据权利要求4所述的端盖组件，其中，所述第三连接部包括不同材质的第一套接部和第二套接部，所述第一套接部套接于所述第二连接部的外侧，所述第二套接部套接于所述第一套接部的外侧；
    其中，所述第二套接部的内周面与所述第一套接部的外周面复合形成所述复合界面，所述复合界面与所述第三间隙相连于所述交界位置。
  14. 根据权利要求13所述的端盖组件，其中，所述密封件至少部分位于所述第三间隙内，并覆盖所述交界位置。
  15. 根据权利要求13所述的端盖组件，其中，所述密封件整***于所述第一间隙和/或所述第二间隙。
  16. 根据权利要求13-15任一项所述的端盖组件，其中，所述第二连接部与所述第一连接部一体成型。
  17. 根据权利要求4-16任一项所述的端盖组件，其中，所述端盖组件还包括第一绝缘件和第二绝缘件；
    所述第一绝缘件至少部分设置于所述第一间隙内，以绝缘隔离第一连接部和所述端盖；
    所述第二绝缘件至少部分设置于所述第三间隙内，以绝缘隔离第三连接部和所述端盖。
  18. 根据权利要求1-17任一项所述的端盖组件，其中，所述端盖为一体成型设置的板状结构。
  19. 根据权利要求1-17任一项所述的端盖组件，其中，所述端盖包括层叠设置的第一盖体和第二盖体，所述引出孔贯穿所述第一盖体和所述第二盖体，所述第一盖体用于封闭所述第一壳体的开口，所述第二盖体用于封闭第二壳体的开口。
  20. 根据权利要求19所述的端盖组件，其中，所述端盖还包括第三绝缘件，所述引出孔贯穿所述第三绝缘件，所述第三绝缘件层叠设置于所述第一盖体和所述第二盖体之间，以绝缘隔离所述第一盖体和所述第二盖体。
  21. 一种电池单体，包括：
    第一壳体；
    第一电极组件，容纳于所述第一壳体内；
    如权利要求1-18任一项所述的端盖组件，所述电极端子与所述第一电极组件电连接，所述端盖封闭所述第一壳体的开口。
  22. 根据权利要求21所述的电池单体，其中，所述电池单体还包括第二壳体和第二电极组件，所述第二电极组件容纳于所述第二壳体内，所述电极端子与所述第二电极组件电连接；
    所述端盖包括层叠设置的第一盖体和第二盖体，所述引出孔贯穿所述第一盖体和所述第二盖体，所述第一盖体用于封闭所述第一壳体的开口，所述第二盖体用于封闭所述第二壳体的开口。
  23. 根据权利要求22所述的电池单体，其中，所述端盖还包括第三绝缘件，所述引出孔贯穿所述第三绝缘件，所述第三绝缘件层叠设置于所述第一盖体和所述第二盖体之间，以绝缘隔离所述第一盖体和所述第二盖体。
  24. 一种电池，包括如权利要求21-23任一项所述的电池单体。
  25. 一种用电设备，包括如权利要求24所述的电池。
PCT/CN2022/112191 2022-08-12 2022-08-12 端盖组件、电池单体、电池及用电设备 WO2024031660A1 (zh)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005093156A (ja) * 2003-09-16 2005-04-07 Honda Motor Co Ltd 電池の接続構造
JP2005123069A (ja) * 2003-10-17 2005-05-12 Sanyo Electric Co Ltd 組電池
CN1893201A (zh) * 2005-05-17 2007-01-10 Ykk株式会社 电连接器、罩装置以及具有这些部件的蓄电池以及母线
WO2019051630A1 (zh) * 2017-09-12 2019-03-21 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN112838325A (zh) * 2019-11-22 2021-05-25 比亚迪股份有限公司 一种电池、电池模组、电池包和电动车
WO2022071298A1 (ja) * 2020-09-29 2022-04-07 株式会社Ｇｓユアサ 蓄電素子

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005093156A (ja) * 2003-09-16 2005-04-07 Honda Motor Co Ltd 電池の接続構造
JP2005123069A (ja) * 2003-10-17 2005-05-12 Sanyo Electric Co Ltd 組電池
CN1893201A (zh) * 2005-05-17 2007-01-10 Ykk株式会社 电连接器、罩装置以及具有这些部件的蓄电池以及母线
WO2019051630A1 (zh) * 2017-09-12 2019-03-21 宁德时代新能源科技股份有限公司 二次电池的顶盖组件以及二次电池
CN112838325A (zh) * 2019-11-22 2021-05-25 比亚迪股份有限公司 一种电池、电池模组、电池包和电动车
WO2022071298A1 (ja) * 2020-09-29 2022-04-07 株式会社Ｇｓユアサ 蓄電素子

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