WO2024050757A1 - 端盖组件、电池单体、电池和用电装置 - Google Patents

端盖组件、电池单体、电池和用电装置 Download PDF

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Publication number
WO2024050757A1
WO2024050757A1 PCT/CN2022/117825 CN2022117825W WO2024050757A1 WO 2024050757 A1 WO2024050757 A1 WO 2024050757A1 CN 2022117825 W CN2022117825 W CN 2022117825W WO 2024050757 A1 WO2024050757 A1 WO 2024050757A1
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WIPO (PCT)
Prior art keywords
insulating member
cover plate
cover
protruding portion
protruding
Prior art date
Application number
PCT/CN2022/117825
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English (en)
French (fr)
Inventor
林蹬华
陈龙
陈新祥
郑于炼
金海族
王鹏
黄守君
Original Assignee
宁德时代新能源科技股份有限公司
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2022/117825 priority Critical patent/WO2024050757A1/zh
Publication of WO2024050757A1 publication Critical patent/WO2024050757A1/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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells

Definitions

  • the present application relates to the field of battery technology, and in particular to an end cover assembly, a battery cell, a battery and a power device.
  • Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection.
  • battery technology is an important factor related to their development.
  • the relative stability between some components is related to the structural stability of the battery; especially for some combined types of battery cells, the shell is generally formed by at least two shells connected at the end, and adjacent The two shells are connected through an end cover with an integrated structure.
  • This type of end cover usually includes two end cover plates arranged opposite each other. The two end cover plates are respectively used to cover the openings of the two adjacent shells.
  • the relative stability relationship between these components directly affects the structural stability of the battery cell.
  • the present application provides an end cover assembly, a battery cell, a battery and an electrical device, which can maintain the relative stability between the first cover plate and the first insulating member and between the second cover plate and the second insulating member, and improve Structural stability of battery cells.
  • the application provides an end cover assembly, including a first cover plate, a second cover plate, a first insulating member and an anti-rotation device.
  • the first cover plate is used to close the first housing
  • the second cover plate is used to close the first housing.
  • the second cover plate and the first cover plate are arranged oppositely along the first direction
  • the first insulating member is arranged between the first cover plate and the second cover plate
  • the anti-rotation device is arranged on the first insulating member and between the first cover plate and the first insulating piece and the second cover plate to prevent relative rotation between the first insulating piece and the first cover plate and between the first insulating piece and the second cover plate.
  • the anti-rotation device includes an anti-rotation component, a first groove provided on the first cover, a second groove provided on the second cover, the anti-rotation component is provided on the first insulating member, and
  • the anti-rotation component includes a first protruding portion protruding from the first insulating piece and at least partially inserted into the first groove, and a second protruding portion protruding from the first insulating piece and at least partially inserted into the second groove.
  • first protruding portion By providing the first protruding portion and inserting at least part of the first protruding portion into the first groove, it can be used to prevent the first insulating member and the first cover from relative rotation; by providing the second protruding portion, And inserting at least part of the second protrusion into the second groove can be used to prevent the first insulating member and the second cover from relative rotation.
  • first raised portion and the first insulating member are integrally formed; and/or the second raised portion and the first insulating member are integrally formed.
  • This embodiment can omit the step of respectively connecting the first protruding part and the first insulating member and the second protruding part and the first insulating member, thereby simplifying the assembly steps and improving the assembly efficiency.
  • the first insulating member is provided with a mounting hole
  • the anti-rotation component further includes an intermediate portion inserted into the mounting hole, and the first protruding portion, the second protruding portion and the intermediate portion are integrally formed.
  • the anti-rotation component can be used as an independent component as a whole, which facilitates the separate manufacturing of the anti-rotation component and avoids the need for separate manufacturing of the anti-rotation component.
  • the separation into a first protruding part and a second protruding part brings about problems such as a large number of parts and complicated installation.
  • the anti-rotation component is in the shape of a cylinder, and the ratio of the diameter D2 of the anti-rotation component to the diameter D3 of the mounting hole is 0.8-1.
  • the ratio of D2 to D3 when the ratio of D2 to D3 is less than 0.8, the gap between the anti-rotation component and the wall of the mounting hole is large.
  • the anti-rotation component When the anti-rotation component is subjected to torsion force, the anti-rotation component will be displaced to a certain extent, and then the anti-rotation component will be displaced to a certain extent. This may cause interference between the battery cells equipped with the end cap assembly and other components in the battery pack.
  • the ratio of D2 to D3 is greater than 1, there is no gap or even an interference fit between the anti-rotation component and the hole wall of the mounting hole. This will cause the anti-rotation component to be unable to be assembled into the mounting hole, first groove, or in the second groove.
  • the ratio of the volume V of the first protrusion to the protrusion height H of the first protrusion protruding from the first insulating member is 1.5 to 1300.
  • the ratio of V to H when the ratio of V to H is less than 1.5, the diameter of the portion of the first protruding portion protruding from the first insulating member will be too small or the first protruding portion will protrude beyond the first insulating member.
  • the height H is too high, which affects the structural strength of the first protrusion itself.
  • the ratio of V to H is greater than 1300, the protruding height of the first protruding portion from the first insulating member will be too short, and the anti-rotation effect will be poor, and at this time, the first protruding portion will easily Slide out of the first or second groove.
  • the end cover assembly further includes a connecting post, the first cover plate is provided with a first through hole, the second cover plate is provided with a second through hole, the first insulating member is provided with a third through hole, and the connecting posts are sequentially The first through hole, the third through hole and the second through hole are passed through to electrically connect the first electrode assembly disposed in the first housing and the second electrode assembly disposed in the second housing.
  • the electrical connection between the first electrode assembly disposed in the first housing and the second electrode assembly disposed in the second housing is achieved by arranging the connecting post.
  • the connecting post can also cooperate with the anti-rotation device to prevent relative rotation between the first insulating member and the first cover plate and the first insulating member and the second cover plate.
  • the connecting post is in the shape of a cylinder, the distance between at least one of the first protruding portion and the second protruding portion and the connecting post is d, and the diameter of the connecting post is D1; wherein , the ratio of d to D1 is 0.5 ⁇ 20.
  • the ratio of d to D1 is controlled between 0.5 and 20, which can achieve better anti-torsion capability.
  • the ratio of d to D1 is less than 0.5, it means that at least one of the first protruding part and the second protruding part is closer to the connecting column.
  • T torque
  • F is It can be seen that when the force on the anti-rotation component 45 is constant, the shorter the distance L, the worse the anti-torsion capability T.
  • the ratio of d to D1 is greater than 20, it means that at least one of the first protruding part and the second protruding part is farther from the connecting post.
  • both the first protruding part and the second protruding part are If at least one of them is too close to the edge of the first insulating member, the local wall thickness of the first groove and the second groove will be too thin and the strength will be poor.
  • the first raised portion and the second raised portion are cylindrical in shape.
  • the connecting post is in the shape of a cylinder, the diameter of at least one of the first protruding portion and the second protruding portion is D2, and the diameter of the connecting post is D1; wherein, the ratio of D2 to D1 is 0.01 ⁇ 0.98.
  • the ratio of D2 to D1 when the ratio of D2 to D1 is less than 0.01, the diameter of at least one of the first protruding portion and the second protruding portion is smaller, and the anti-torsion effect is poor.
  • the ratio of D2 to D1 is greater than 0.98, at least one of the first protruding part and the second protruding part has a larger diameter and takes up a larger space, which will reduce the space for other components and also lead to the installation of The local strength of the first insulating member of the mounting hole, the first cover plate provided with the first groove, and the second cover plate provided with the second groove is insufficient.
  • the ratio of the diameter D2 of the first protrusion to the protrusion height H of the first protrusion is 0.1 ⁇ 10.
  • the ratio of D2 to H when the ratio of D2 to H is less than 0.1, the diameter of the first protrusion is too small or the protrusion height of the first protrusion is too high, which will reduce the structural strength of the first protrusion itself.
  • the ratio of D2 to H is greater than 10, the protruding height of the first protruding portion will be too short and the anti-rotation effect will be poor. Moreover, the first protruding portion will easily slip out of the first groove.
  • the ratio of the volume V of the first protrusion to the diameter D2 of the first protrusion is 2-400.
  • the ratio of V to D2 when the ratio of V to D2 is less than 2, the height of the first protrusion will be too short and the anti-rotation effect will be poor. Moreover, at this time, the first protrusion will easily slip out of the first groove. Slide out.
  • the ratio of V to D2 is greater than 400, the diameter of the first protrusion will be too small or the protrusion height of the first protrusion will be too high, thus reducing the structural strength of the first protrusion itself.
  • the first insulating member has a square structure. In the length direction of the first insulating member, the distance between the anti-rotation component and the connecting post is L; in the width direction of the first insulating member, the anti-rotation component and The spacing distance between connecting columns is W; where the ratio of W to L is greater than or equal to 0.01.
  • the anti-rotation component and the connecting column are located close to the same horizontal line, and the anti-rotation effect at this time is poor.
  • the present application provides a battery cell, including the above-mentioned end cap assembly.
  • the present application provides a battery, including a box and the above-mentioned battery cells.
  • the battery cells are arranged in the box, and the battery cells are used to provide electric energy.
  • the present application provides an electric device, which includes the above-mentioned battery cell, which is used to supply electric energy to the electric device; or includes the above-mentioned battery, which is used to supply electric energy to the electric device.
  • Figure 1 is a schematic structural diagram of some embodiments of the electrical device disclosed in this application.
  • FIG. 2 is a schematic structural diagram of some embodiments of the battery disclosed in this application.
  • Figure 3 is an exploded view of some embodiments of battery cells disclosed in the present application.
  • FIG. 4 is a schematic structural diagram of some embodiments of the battery cells disclosed in this application.
  • Figure 5 is a top view of some embodiments of battery cells disclosed in the present application.
  • Figure 6 is a cross-sectional view along section A-A in Figure 5;
  • Figure 7 is an exploded view of some embodiments of the end cap assembly disclosed herein;
  • Figure 8 is an exploded view of the anti-rotation component in the embodiment of Figure 7 after it is installed on the first insulating component;
  • Figure 9 is a schematic structural diagram of the first insulating member in the embodiment of Figure 7;
  • Figure 10 is a schematic structural diagram of some embodiments of the end cap assembly disclosed in this application.
  • Figure 11 is a top view of some embodiments of the end cap assembly disclosed in the present application.
  • Figure 12 is a cross-sectional view along the B-B section in Figure 11;
  • Figure 13 is a front view of the first insulating member in some embodiments of the end cap assembly disclosed in the present application.
  • Figure 14 is a top view of other embodiments of the end cap assembly disclosed in the present application.
  • Figure 15 is a cross-sectional view along the C-C section in Figure 14;
  • Figure 16 is a side view of some embodiments of the end cap assembly disclosed herein;
  • FIG. 17 is a cross-sectional view along the D-D section in FIG. 16 .
  • End cover assembly 20. First housing; 30. Second housing; 40. First electrode assembly; 50. Second electrode assembly; 60. First end cover assembly; 70. Second end cover assembly;
  • First cover 11. First through hole; 2. Second cover; 21. Second through hole; 3. First insulating member; 31. Third through hole; 4. Anti-rotation device; 41. Anti-rotation component; 411, first raised portion; 412, second raised portion; 413, middle portion; 42, first groove; 43, second groove; 44, mounting hole; 5, first conductive member ; 51. Connecting post; 52. Limiting part; 6. Second conductive member; 61. Fourth through hole; 7. Second insulating member; 71. Fifth through hole; 8. Third insulating member; 81. Six through holes; 91, first seal; 92, second seal.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present 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. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to two or more, unless otherwise explicitly and specifically limited.
  • multiple sets refers to two or more sets
  • multiple slices refers to two or more slices, unless otherwise clearly and specifically limited.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the inventor of the present application has noticed that as the application scope of power batteries continues to expand, the demand for battery capacity of various electrical devices is also constantly increasing.
  • the length of the battery cell is longer than that of the battery cell containing one cell. Therefore, during use, the battery cell may be subjected to lateral shear force and the two cells may be damaged.
  • the relative rotation of the cells connected in series affects the overall quality and safety of the battery cells.
  • an anti-rotation device can be provided between the first insulating member and the first cover plate and between the first insulating member and the second cover plate to prevent the first insulating member and the first cover plate from being rotated. Relative rotation occurs between the first insulating member and the second cover plate, thereby improving the torsion resistance of the end cover assembly and the battery cell equipped with the end cover assembly.
  • the end cap assembly disclosed in the embodiment of the present application is suitable for battery cells, batteries, and electrical devices using batteries.
  • Electrical devices can be mobile phones, portable devices, laptops, battery cars, electric cars, ships, spacecraft, electric toys and power tools, etc.
  • spacecraft include airplanes, rockets, space shuttles, spaceships, etc.
  • electric toys Including fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.
  • Power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools.
  • the electrical device can be a vehicle 1000, such as a new energy vehicle.
  • the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.; or the electrical device can also be a drone or a ship, etc.
  • the vehicle 1000 may include a battery 100, an axle 200, a wheel 300 connected to the axle 200, a motor 400, and a controller 500.
  • the controller 500 is used to control the operation of the motor 400
  • the motor 400 is used to drive the axle 200 to rotate.
  • the rotation of the axle 200 drives the rotation of the wheels 300.
  • the battery 100 can be disposed at the bottom, head or tail of the vehicle 1000 to provide electrical energy for the operation of the motor 400 and other components in the vehicle.
  • the battery 100 includes a battery cell 101 and a case 102 .
  • the battery 100 there may be one battery cell 101 or a plurality of battery cells 101.
  • the multiple battery cells 101 can be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the multiple battery cells 101 are both connected in series and in parallel, and they can be multiple battery cells.
  • 101 is first connected in series, parallel or mixed to form a battery module, and then multiple battery modules are connected in series, parallel or mixed to form a whole, and are accommodated in the box 102 . It is also possible that all the battery cells 101 are directly connected in series or in parallel or mixed together, and then the whole battery cell 101 is accommodated in the box 102 .
  • the interior of the box 102 is a hollow structure.
  • the box 102 may include a box body 102a and a cover 102b.
  • the box body 102a and the cover 102b are fastened together.
  • both the box body 102a and the cover 102b can be hollow rectangular parallelepipeds with only one open surface.
  • the opening of the box body 102a and the opening of the cover 102b are arranged oppositely, and the box body 102a and the cover 102b are interlocked with each other. Combined to form a box body with a closed chamber.
  • the box body 102a is a rectangular parallelepiped with an opening and the cover 102b is plate-shaped, or the cover 102b is a rectangular parallelepiped with an opening and the box body 102a is plate-shaped, and the box body 102a and the cover 102b are arranged oppositely. They are snapped together to form a box 102 with a closed cavity. At least one battery cell 101 is connected in parallel or in series or in a mixed combination, and then placed in a closed chamber formed by the box body 102a and the cover 102b being fastened together.
  • the battery cell 101 includes a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery or a magnesium ion battery, etc.
  • the embodiments of the present disclosure are not limited thereto.
  • 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 disclosure are not limited thereto.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, rectangular battery cells and soft-pack battery cells, and the embodiments of the present disclosure are not limited to this.
  • the battery cell includes an end cap assembly 10 , a first case 20 , a second case 30 , a first electrode assembly 40 , a second electrode assembly 50 , a first End cap assembly 60 and second end cap assembly 70 .
  • Both the first housing 20 and the second housing 30 have openings, the first electrode assembly 40 is accommodated inside the first housing 20 , and the second electrode assembly 50 is accommodated inside the second housing 30 .
  • the first housing 20 and the second housing 30 have opposite openings, and the end cover assembly 10 is disposed between the first housing 20 and the second housing 30 .
  • the first end cover assembly 60 and the second end cover assembly 70 are respectively disposed at openings of the first housing 20 and the second housing 30 that are far away from each other.
  • the first housing 20 and the second housing 30 are filled with electrolyte respectively.
  • Both the first electrode assembly 40 and the second electrode assembly 50 may be formed by stacking or winding first pole pieces and second pole pieces with opposite polarities, and usually a separator is provided between the first pole piece and the second pole piece. .
  • the coated portions of the first pole piece and the second pole piece constitute the main body portions of the first electrode assembly 40 and the second electrode assembly 50 , and the uncoated portions of the first pole piece and the second pole piece each constitute two types of Opposite polarity tabs.
  • the first tab on the first electrode assembly 40 and the second tab on the second electrode assembly 50 are electrically connected through the end cover assembly 10 , and the other tab on the first electrode assembly 40 is connected to the first tab on the first end cover assembly 60 The other tab of the second electrode assembly 50 is connected to the terminal on the second end cap assembly 70 .
  • the first housing 20 and the second housing 30 may be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shapes of the first housing 20 and the second housing 30 may be determined according to the specific shapes and sizes of the first electrode assembly 40 and the second electrode assembly 50 .
  • the first housing 20 and the second housing 30 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the end cover assembly 10 includes a first cover plate 1, a second cover plate 2, a first insulating member 3 and an anti-rotation device 4.
  • the first cover plate 1 is used to close the first housing 20, which is used to accommodate the first electrode assembly 40.
  • the second cover plate 2 is used to close the second housing 30, which is used to accommodate the second electrode assembly. 50.
  • the second cover plate 2 and the first cover plate 1 are arranged oppositely along the first direction, for connecting the first shell 20 closed by the first cover plate 1 and the second shell closed by the second cover plate 2 30 are arranged along the first direction, the first insulating member 3 is disposed between the first cover 1 and the second cover 2, the anti-rotation device 4 is disposed between the first insulating member 3 and the first cover 1 and the second between an insulating member 3 and the second cover plate 2 to prevent relative rotation between the first insulating member 3 and the first cover plate 1 and between the first insulating member 3 and the second cover plate 2 .
  • the first insulating member 3 and the first cover can be prevented from rotating.
  • the relative rotation of the plate 1 and the relative rotation of the first insulating part 3 and the second cover plate 2 maintain the tension between the first insulating part 3 and the first cover plate 1 and between the first insulating part 3 and the second cover plate 2
  • Relative stability that is, maintaining the relative stability between the first cover plate 1 and the second cover plate 2, thereby improving the anti-twisting ability of the end cover assembly and the battery cell equipped with the end cover assembly, and improving the resistance of the battery cell. Structural stability.
  • the anti-rotation device 4 disposed between the first insulating member 3 and the first cover 1 can prevent the first insulating member 3 and the first cover 1 from rotating relative to each other.
  • the anti-rotation device 4 disposed between the first insulating member 3 and the second cover 2 can prevent the first insulating member 3 and the second cover 2 from rotating relative to each other.
  • the first cover plate 1 and the second cover plate 2 After the relative rotation between the first insulating member 3 and the first cover plate 1 and the relative rotation between the first insulating member 3 and the second cover plate 2 are restricted to a certain extent, the first cover plate 1 and the second cover plate 2 The anti-torsion capability between the two cover plates 2 has also been improved, and the anti-torsion capability between the first housing 20 connected to the first cover plate 1 and the second housing 30 connected to the second cover plate 2 has also been improved. This can effectively improve the torsion resistance of the entire battery cell and improve the quality of the battery cell.
  • the first cover plate 1 is used to close the first housing 20.
  • the first cover plate 1 and the first housing 20 form a substantially closed space, and the first electrode assembly 40, electrolyte and other components can be accommodated in this space.
  • the second cover plate 2 is used to close the second housing 30.
  • the second cover plate 2 and the second housing 30 form a substantially closed space, and the second electrode assembly 50, electrolyte and other components can be accommodated in this space.
  • the first housing 20 and the second housing 30 may be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shapes and sizes of the first housing 20 and the second housing 30 may be determined according to the specific shapes and sizes of the first electrode assembly 40 and the second electrode assembly 50 . The shapes of the first housing 20 and the second housing 30 may be the same or different.
  • the first housing 20 and the second housing 30 may be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the shapes and sizes of the first cover plate 1 and the second cover plate 2 can be selected in many ways, such as circular, square, pentagonal or hexagonal. Specifically, the shapes and sizes of the first cover 1 and the second cover 2 can be determined according to the shapes and sizes of the first housing 20 and the second housing 30 . The shapes of the first cover plate 1 and the second cover plate 2 may be the same or different.
  • the first cover plate 1 and the second cover plate 2 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiment of the present application.
  • the shape and size of the first insulating member 3 can also be selected from a variety of shapes, such as a circle, a square, a pentagon, a hexagon, etc.
  • the shape and size of the first insulating member 3 and the shapes and sizes of the first cover plate 1 and the second cover plate 2 may be the same or different.
  • the first insulating member 3 can be made of a variety of materials, such as plastic, rubber, ceramics, etc., which are not particularly limited in the embodiments of the present application.
  • the first insulating member 3 is disposed between the first cover plate 1 and the second cover plate 2 .
  • the orthogonal projected area of the first cover plate 1 on the first insulating member 3 may be greater than, less than, or equal to the surface area of the first insulating member 3 .
  • the orthogonal projected area of the second cover 2 on the first insulating member 3 may be greater than, less than, or equal to the surface area of the first insulating member 3 .
  • Both sides of the first insulating member 3 may be in contact with the first cover 1 and the second cover 2 respectively; or, there may be a gap between both sides of the first insulating member 3 and the first cover 1 and the second cover 2 respectively. Gap, other components can be arranged separately in this gap.
  • the anti-rotation device 4 includes an anti-rotation component 41 , a first groove 42 provided on the first cover 1 , and a second groove provided on the second cover 2 .
  • groove 43, the anti-rotation component 41 is provided on the first insulating member 3, and the anti-rotation component 41 includes a first protruding portion 411 protruding from the first insulating member 3 and at least partially inserted into the first groove 42, and a first protruding portion 411 protruding from the first insulating member 3.
  • the first insulating member 3 is at least partially inserted into the second protruding portion 412 of the second groove 43 .
  • first protruding portion 411 By providing the first protruding portion 411 and inserting at least part of the first protruding portion 411 into the first groove 42, it can be used to prevent the first insulating member 3 and the first cover 1 from relative rotation;
  • the two protruding portions 412 and inserting at least part of the second protruding portion 412 into the second groove 43 can be used to prevent the first insulating member 3 and the second cover plate 2 from rotating relative to each other.
  • the shape of the first protruding part 411 matches the shape of the first groove 42
  • the shape of the second protruding part 412 matches the shape of the second groove 43 .
  • the number of the first protruding portion 411, the first groove 42, the second protruding portion 412 and the second groove 43 can be selected in various ways.
  • the number of the first protrusions 411 and the first grooves 42 is equal, such as one, two or more.
  • the number of the second protrusions 412 and the second grooves 43 is equal, such as one, two or more.
  • the number of the first protruding portion 411 and the first groove 42 and the number of the second protruding portion 412 and the second groove 43 may be the same or different.
  • the first protruding portion 411 and the first groove 42 have a non-rotational fit to prevent relative rotation between the first insulating member 3 and the first cover 1; There is a non-rotational fit between the two grooves 43 to prevent the first insulating member 3 and the first cover 1 from rotating relative to each other.
  • the first protruding part 411 has a square structure
  • the first groove 42 is a square groove
  • the second protruding part 412 has a square structure
  • the second groove 43 is a square groove.
  • first protruding portion 411 and the second protruding portion 412 can also be in the shape of a triangular prism, a pentagonal prism, etc., and correspondingly the first groove 42 and the second groove 43 can be a triangular groove or a pentagon. Groove etc.
  • the number of the first protruding portion 411 and the first groove 42 is at least two to prevent the first insulating member 3 and the first cover 1 from relative rotation; the second protruding portion 412 and The number of the second grooves 43 is at least two to prevent the first insulating member 3 and the first cover 1 from rotating relative to each other.
  • the end cover assembly 10 further includes a connecting post 51 , the first cover 1 is provided with a first through hole 11 , the second cover 2 is provided with a second through hole 21 , and the first insulation member 3 is provided with a third through hole 11 .
  • the three through holes 31 and the connecting posts 51 pass through the first through hole 11 , the third through hole 31 and the second through hole 21 in sequence, so as to connect the first electrode assembly 40 provided in the first housing 20 and the The second electrode assembly 50 in the second housing 30 is electrically connected.
  • the number of the first protrusion 411 and the first groove 42 is one.
  • the rotation axis of the first protrusion 411 and the rotation axis of the connecting column 51 are not collinear, so this can also prevent the first insulating member 3 and the first cover 1 from rotating relative to each other; the number of the second protruding portion 412 and the second groove 43 is both one.
  • the rotation axis and the rotation axis of the connecting column 51 are not collinear, so the relative rotation of the first insulating member 3 and the first cover plate 1 can also be prevented.
  • the number of the first protruding portion 411 and the first groove 42 and the number of the second protruding portion 412 and the second groove 43 can also be two. One or more to improve the anti-rotation effect.
  • the number of anti-rotation devices 4 is two
  • the first cross-section of the first insulating member 3 is square
  • the projections of the two anti-rotation devices 4 on the first cross-section are located at intervals. on the diagonal of the first section.
  • the first cross section is the surface passing through the first insulating member 3 .
  • the square first cross section is used as a reference plane.
  • the projections of the two anti-rotation devices 4 are located at intervals opposite to the square reference plane. on the corner line.
  • the first cross section may be the outer surface of the first insulating member 3 close to the first cover 1 , or may be the outer surface of the first insulating member 3 close to the second cover.
  • the outer surface of the plate 2 can also be located between the outer surface of the first insulating member 3 close to the first cover plate 1 and the outer surface of the first insulating member 3 close to the second cover plate 2 and with the first insulating member 3
  • the outer surface of the first insulating member 3 close to the first cover plate 1 is parallel to the outer surface of the first insulating member 3 close to the second cover plate 2 .
  • the anti-rotation capability of the end cover assembly 10 can be further improved.
  • the projection of the two anti-rotation devices 4 on the first cross-section is arranged to be spaced apart on the diagonal line of the first cross-section, which can further improve the torsion resistance.
  • the end cover assembly further includes a connecting post 51 , the first cover 1 is provided with a first through hole 11 , the second cover 2 is provided with a second through hole 21 , and the first insulation member 3 is provided with a third
  • the through hole 31 and the connecting post 51 pass through the first through hole 11 , the third through hole 31 and the second through hole 21 in sequence, so that the first electrode assembly 40 provided in the first housing 20 and the first electrode assembly 40 provided in the second housing
  • the second electrode assembly 50 in the body 30 is electrically connected, and the projections of the two anti-rotation devices 4 and the connecting column 51 on the first cross-section are collinear.
  • the anti-torsion capability of the end cover assembly 10 can be further improved.
  • first raised portion 411 and the first insulating member 3 are integrally formed; and/or the second raised portion 412 and the first insulating member 3 are integrally formed.
  • This embodiment can omit the step of respectively connecting the first protruding part 411 and the first insulating member 3 and the second protruding part 412 and the first insulating member 3, thereby simplifying the assembly steps and improving the assembly efficiency.
  • the first insulating member 3 is provided with a mounting hole 44
  • the anti-rotation component 41 also includes an intermediate portion 413 inserted in the mounting hole 44, a first protruding portion 411, a second protruding portion 412 and The middle portion 413 is integrally formed.
  • the anti-rotation component 41 can be used as a whole independent component, which facilitates the separate manufacturing of the anti-rotation component 41 , it can also avoid the problems of a large number of parts and complicated installation caused by dividing it into a first protruding part 411 and a second protruding part 412.
  • the anti-rotation component 41 has a cylindrical shape, and the ratio of the diameter D2 of the anti-rotation component 41 to the diameter D3 of the mounting hole 44 is 0.8 ⁇ 1.
  • the ratio of D2 to D3 can be 0.8, 0.82, 0.84, 0.86, 0.88, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, 1, etc.
  • the diameter D2 of the anti-rotation component 41 may be 0.5 ⁇ 30.
  • the diameter D2 of the anti-rotation component 41 can be 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 , 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, etc.
  • the diameter D3 of the mounting hole 44 may range from 0.7 to 35.
  • the diameter D3 of the mounting hole 44 can be 0.7, 1, 2, 4, 4.1, 4.2, 4.5, 4.8, 5, 5.1, 5.5, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 31, 32, 33, 34, 35, etc.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the ratio of the diameter D2 of the anti-rotation component 41 to the diameter D3 of the mounting hole 44 satisfies 0.8 to 1. Therefore, the cooperation between the anti-rotation component 41 and the mounting hole 44 is appropriate and the anti-rotation effect is good. .
  • the ratio of the volume V of the first protruding portion 411 to the protruding height H of the first protruding portion 411 protruding from the first insulating member 3 is 1.5 to 1300.
  • the ratio of the volume V of the first protruding part 411 to the protruding height H of the first protruding part 411 protruding from the first insulating member 3 may be 1.5, 1.6, 1.8, 2.0, 10, 100, 200, 300 , 400, 500, 600, 700, 800, 900, 1000, 1100, 1200, 1300, etc.
  • the protruding height of the first protrusion 411 from the first insulating member 3 will be too short, and the anti-rotation effect will not be good, and at this time the first protrusion will The portion 411 can easily slide out of the first groove 42 or the second groove 44 .
  • the volume V of the first protrusion 411 may range from 6 to 13,000.
  • the volume V of the first protrusion 411 may be 6, 8, 10, 100, 500, 1000, 2000, 4000, 6000, 8000, 10000, 11000, 12000, 13000, etc.
  • the protruding height H of the first protruding portion 411 protruding from the first insulating member 3 may be 1 ⁇ 10.
  • the protrusion height H of the first protrusion 411 protruding from the first insulating member 3 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, etc.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the first protruding part 411 occupies a large height space, so it will affect the energy density of the battery cell; moreover, the anti-rotation of the first protruding part 411
  • the diameter is small, the strength is low, and the torsion limit it can withstand is 1 N ⁇ m. At this time, the first protruding portion 411 is easily broken, and the anti-rotation effect is poor.
  • the first protruding portion 411 occupies a large length and width space, which will also affect the energy density of the battery cell; moreover, the anti-rotation diameter of the first protruding portion 411 is too large and the height is low , the aspect ratio is small, and the torsion limit value that can be tolerated is 2N ⁇ m. At this time, the first protrusion 411 can easily slip out of the first groove 42, and the anti-rotation effect is not good.
  • the ratio of the volume V of the first protruding portion 411 to the protruding height H of the first protruding portion 411 from the first insulating member 3 satisfies 1.5 to 1300, and the aspect ratio is appropriate.
  • the torsion that can be tolerated meets the requirements, and the first protruding portion 411 is neither easy to break nor easy to slip out of the first groove 42, so the anti-rotation effect is good.
  • the ratio of the volume V of the second protruding part 412 to the protruding height H of the second protruding part 412 protruding from the first insulating member 3 may also be set to 1.5 to 1300.
  • the end cover assembly 10 further includes a connecting post 51 , the first cover 1 is provided with a first through hole 11 , the second cover 2 is provided with a second through hole 21 , and the first insulation member 3 is provided with a third through hole 11 .
  • the three through holes 31 and the connecting posts 51 pass through the first through hole 11 , the third through hole 31 and the second through hole 21 in order for electrically connecting the first electrode assembly 40 and the device arranged in the first housing 20
  • the second electrode assembly 50 is in the second housing 30 .
  • the electrical connection between the first electrode assembly 40 provided in the first housing 20 and the second electrode assembly 50 provided in the second housing 30 is achieved by providing the connecting post 51 .
  • the connecting post 51 can also cooperate with the anti-rotation device 4 to prevent relative rotation between the first insulating member 3 and the first cover 1 and the first insulating member 3 and the second cover 2 .
  • the connecting post 51 is in the shape of a cylinder.
  • the distance between at least one of the first protruding portion 411 and the second protruding portion 412 and the connecting post 51 is d.
  • the diameter is D1; among them, the ratio of d to D1 is 0.5 ⁇ 20.
  • the ratio of d to D1 can be 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 wait.
  • the ratio of d to D1 is controlled between 0.5 and 20, which can achieve better anti-torsion capability.
  • the ratio of d to D1 is less than 0.5, it means that at least one of the first protruding part 411 and the second protruding part 412 is closer to the connecting column 51.
  • the ratio of d to D1 is greater than 20, it means that at least one of the first protruding part 411 and the second protruding part 412 is farther from the connecting post 51 . At this time, the first protruding part 411 and the second protruding part 412 If at least one of the raised portions 412 is too close to the edge of the first insulating member 3 , the local wall thickness of the first groove 42 and the second groove 43 will be too thin and the strength will be poor.
  • the connecting post 51 is in the shape of a cylinder, the distance between the first protrusion 411 and the connecting post 51 is d1, and the diameter of the connecting post 51 is D1; where d1 and D1
  • the ratio of The ratio is 0.5 to 20;
  • the connecting post 51 is in the shape of a cylinder, the distance between the first protrusion 411 and the connecting post 51 is d1, and the diameter of the connecting post 51 is D1; where, the ratio of d1 to D1 is 0.5-20; and the distance between the second protrusion 412 and the connecting post 51 is d2, and the diameter of the connecting post 51 is D1; where the ratio of d2 to D1 is 0.5-20.
  • the separation distance d between at least one of the first protruding portion 411 and the second protruding portion 412 and the connecting post 51 may range from 1 to 600.
  • d can be 1, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500, 550, 600, etc.
  • the diameter D1 of the connecting post 51 may range from 1 to 30.
  • D1 can be 1, 2, 5, 7, 19, 12, 15, 17, 20, 22, 25, 27, 30, etc.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the first protruding portion 411 is far away from the connecting column 51. At this time, the first protruding portion 411 is too close to the edge, which will cause the local wall thickness of the first groove 42 to be too thin and have low strength. Moreover, the force arm is longer, and the torsion limit value that the first protrusion 411 can withstand is 2.5 N ⁇ m. The middle part of the first insulating member 3 may be deformed, and the anti-rotation effect is not good.
  • the ratio of the distance d between the first protrusion 411 and the connecting column 51 to D1 of the connecting column 51 satisfies 0.5 to 20, the length of the lever arm is appropriate, and the anti-rotation effect is good.
  • the first protruding portion 411 and the second protruding portion 412 are cylindrical in shape.
  • both the first protruding part 411 and the second protruding part 412 into a cylindrical shape, the manufacturing and assembly of the first protruding part 411 and the second protruding part 412 can be facilitated.
  • first protruding part 411 and the second protruding part 412 may also be in other shapes such as square or triangular prism.
  • the connecting post 51 is in the shape of a cylinder, the diameter of at least one of the first protruding portion 411 and the second protruding portion 412 is D2, and the diameter of the connecting post 51 is D1; wherein, D2 The ratio to D1 is 0.01 ⁇ 0.98.
  • the ratio of D2 to D1 can be 0.01, 0.03, 0.05, 0.07, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98 etc.
  • the ratio of D2 to D1 when the ratio of D2 to D1 is less than 0.01, the diameter of at least one of the first protruding portion 411 and the second protruding portion 412 is smaller, and the anti-torsion Less effective.
  • the ratio of D2 to D1 is greater than 0.98, at least one of the first protruding portion 411 and the second protruding portion 412 has a larger diameter and occupies a larger space, which will reduce the space for other components and cause
  • the first insulating member 3 provided with the mounting hole 44, the first cover plate 1 provided with the first groove 42, and the second cover plate 2 provided with the second groove 43 have insufficient local strength.
  • the connecting post 51 is in the shape of a cylinder, the diameter of the first protrusion 411 is D21, and the diameter of the connecting post 51 is D1; wherein, the ratio of D21 to D1 is 0.01 to 0.98;
  • second, Yes the connecting post 51 is in the shape of a cylinder, the diameter of the second protrusion 412 is D22, and the diameter of the connecting post 51 is D1; where the ratio of D22 to D1 is 0.01 to 0.98;
  • the connecting post 51 is in the shape of a cylinder , the diameter of the first protruding part 411 is D21, and the diameter of the connecting post 51 is D1; where the ratio of D21 to D1 is 0.01 to 0.98; and the diameter of the second protruding part 412 is D22, and the diameter of the connecting post 51 is D1 ;
  • the ratio of D22 to D1 is 0.01 ⁇ 0.98.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the diameter of the first protruding part 411 is large and takes up a large space, which may result in insufficient local strength of the corresponding first groove 42. At this time, the torsion force that the first protruding part 411 can withstand is If the limit value is small, the risk of local cracking of the first insulating member 3 is greater, and the anti-rotation effect is poor.
  • the ratio of the diameter D2 of the first protruding portion 411 to the diameter D1 of the connecting post 51 satisfies 0.01 to 0.98, so the risk of cracking of the first insulating member 3 and the first protruding portion 411 is relatively small. , the anti-rotation effect is better.
  • the ratio of the diameter D2 of the first protruding part 411 to the protruding height H of the first protruding part 411 is 0.1 ⁇ 10.
  • the ratio of the diameter D2 of the first protruding part 411 to the protruding height H of the first protruding part 411 may be 0.1, 0.2, 0.4, 0.6, 0.8, 1, 2, 3, 4, 5, 6, 7 ,8,9,10 etc.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the height of the first protruding part 411 is relatively short, the torsion limit value that the first protruding part 411 can withstand is small, and the first protruding part 411 easily slides out of the first groove 42 , the anti-rotation effect is not good.
  • the diameter and height of the first protrusion 411 are appropriate, and there is no risk of breakage, nor is it easy to slip out of the first groove 42, so the anti-rotation effect is better.
  • the ratio of the diameter D2 of the second protruding part 412 to the protruding height H of the first protruding part 411 may also be set to 0.1 ⁇ 10.
  • the ratio of the volume V of the first protrusion 411 to the diameter D2 of the first protrusion 411 is 2 ⁇ 400.
  • the ratio of the volume V of the first protrusion 411 to the diameter D2 of the first protrusion 411 may be 2, 5, 10, 20, 40, 60, 80, 100, 150, 200, 250, 300, 350 , 400, etc.
  • Table 6 shows the comparative results of Comparative Examples 61 to 66, where the ratio of V to D2 does not satisfy the requirement of 2 to 400, and Examples 61 to 64, where the ratio of V to D2 satisfies the requirement of 2 to 400.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • Comparative Examples 64 and 65 the anti-rotation height of the first protruding part 411 is too high, the torsion limit value that the first protruding part 411 can withstand is small, and the first protruding part 411 has a greater risk of fracture.
  • the anti-rotation effect is not good; in Comparative Example 66, the first protruding portion 411 occupies a large height space, which affects the energy density of the battery cell.
  • Embodiments 61 to 64 the height and volume of the first protrusion 411 are appropriate, there is no risk of breakage, and it is not easy to slip out of the first groove 42, so the anti-rotation effect is better.
  • the ratio of the volume V of the second protruding part 412 to the diameter D2 of the second protruding part 412 may also be set to 2-400.
  • the first insulating member 3 has a square structure, and the distance between at least one of the anti-rotation components 41 and the connecting post 51 is L in the length direction of the first insulating member 3; in the first In the width direction of the insulating member 3, the distance between the anti-rotation component 41 and the connecting post 51 is W; where the ratio of W to L is greater than or equal to 0.01.
  • the ratio of W to L can be 0.01, 1, 2, 5, 8, 10, etc.
  • the distance L between at least one of the anti-rotation components 41 and the connecting post 51 in the length direction of the first insulating member 3 may be 0.2 to 500.
  • L can be 0.2, 0.5, 0.8, 1, 2, 5, 8, 10, 50, 80, 100, 200, 300, 400, 500, etc.
  • the separation distance W between the anti-rotation component 41 and the connecting post 51 in the width direction of the first insulating member 3 may be 0.2 ⁇ 500.
  • W can be 0.2, 0.5, 0.8, 1, 2, 5, 8, 10, 50, 80, 100, 200, 300, 400, 500, etc.
  • the first insulating member 3 is made of PP material (Polypropylene, polypropylene), the anti-rotation component 41 is made of ceramic material, and the first cover plate 1 and the second cover plate 2 are made of Made of aluminum.
  • the end cover assembly 10 further includes a first conductive member 5 and a second conductive member 6 .
  • the second conductive member 6 is disposed on the second cover 2 away from the first insulation.
  • the first conductive component 5 includes a connecting post 51 and a limiting part 52.
  • the limiting part 52 is provided on the side of the first cover 1 away from the first insulating component 3.
  • the first cover 1 is provided with The first through hole 11, the second cover plate 2 is provided with a second through hole 21, the first insulating member 3 is provided with a third through hole 31, and the connecting post 51 passes through the first through hole 11, the third through hole 31 and The second through hole 21 is connected to the second conductive member 6 , and the limiting portion 52 is used to limit the movement of the first conductive member 5 along the axis direction of the first through hole 11 .
  • the electrical connection between the first electrode assembly 40 in the first housing 20 and the second electrode assembly 50 in the second housing 30 is achieved through the first conductive member 5 and the second conductive member 6 .
  • the second conductive member 6 is provided with a fourth through hole 61 , and the connecting post 51 passes through the fourth through hole 61 to connect the first conductive member 5 and the second conductive member 6 .
  • the end cover assembly 10 further includes a second insulating member 7 and a third insulating member 8 .
  • the second insulating member 7 is disposed between the first cover plate 1 and the limiting portion 52 .
  • the third insulating member 8 is disposed Between the second cover 2 and the second conductive member 6, the second insulating member 7 is provided with a fifth through hole 71, the third insulating member 8 is provided with a sixth through hole 81, and the connecting post 51 passes through the fifth through hole. 71 and the sixth through hole 81.
  • first cover plate 1 and the limiting portion 52 of the first conductive member 5 can be electrically isolated through the second insulating member 7; the second cover plate 2 and the second conductive member 5 can be electrically isolated through the third insulating member 8.
  • the end cap assembly 10 further includes a first seal 91 disposed between the limiting portion 52 and the second insulating member 7 , and the first seal 91 is provided with a seventh through hole
  • the connecting post 51 passes through the seventh through hole, and the first seal 91 is axially embedded in the fifth through hole 71 and the first through hole 11 to isolate the first cover plate 1 from the limiting portion 52 and the first cover plate 1 and the connecting post 51; and/or it also includes a second sealing member 92, the second sealing member 92 is provided between the second conductive member 6 and the third insulating member 8, the second sealing member 92 is provided with an eighth through hole,
  • the connecting post 51 passes through the eighth through hole, and the second sealing member 92 is axially embedded in the sixth through hole 81 and the second through hole 21 to isolate the second cover plate 2 from the second conductive member 6 and the second cover plate 2 and connecting column 51.
  • the limiting portion 52 of the first conductive member 5 and the second insulating member 7 can be tightly connected in the axial direction, thereby isolating the first sealing member 91 in the axial direction.
  • the limiting portion 52 of the conductive member 5 and the first cover plate 1 , and the connecting post 51 isolating the first cover plate 1 and the first conductive member 5 in the radial direction.
  • the second sealing member 92 By providing the second sealing member 92, the second conductive member 6 and the third insulating member 8 can be tightly connected in the axial direction, and the second conductive member 6 and the second cover plate 2 can be isolated in the axial direction. , and a connecting post 51 that isolates the second cover plate 2 and the first conductive member 5 in the radial direction.
  • Embodiments of the battery cell and end cover assembly provided by the present application will be described below with reference to FIGS. 3 to 17 .
  • the battery cell includes an end cover assembly 10 , a first case 20 , a second case 30 , a first electrode assembly 40 , a second electrode assembly 50 , a first end cover assembly 60 and a third Second end cap assembly 70.
  • Both the first housing 20 and the second housing 30 have openings, the first electrode assembly 40 is accommodated inside the first housing 20 , and the second electrode assembly 50 is accommodated inside the second housing 30 .
  • the opening of the first housing 20 and the opening of the second housing 30 are arranged oppositely, and the end cover assembly 10 is provided between the first housing 20 and the second housing 30 .
  • the first end cover assembly 60 and the second end cover assembly 70 are respectively disposed at one end of the openings of the first housing 20 and the second housing 30 away from each other.
  • Both the first housing 20 and the second housing 30 are square housings.
  • the end cover assembly includes a first cover plate 1, a second cover plate 2, a first insulating member 3, an anti-rotation device 4, a first conductive member 5, a second conductive member 6, a second Insulating member 7 , third insulating member 8 , first sealing member 91 and second sealing member 92 .
  • the first insulating member 3 is disposed between the first cover plate 1 and the second cover plate 2 to insulate the first cover plate 1 and the second cover plate 2 .
  • the second insulating member 7 is disposed on the side of the first cover 1 away from the first insulating member 3
  • the third insulating member 8 is disposed on the side of the second cover 2 away from the first insulating member 3 .
  • the first conductive member 5 includes a connecting post 51 and a limiting portion 52 .
  • the limiting portion 52 is provided on a side of the second insulating member 7 away from the first cover 1 .
  • the connecting post 51 is connected to a side of the limiting portion 52 close to the second insulating member 7 .
  • the second conductive member 6 is disposed on the side of the third insulating member 8 away from the second cover 2 .
  • the first cover 1 is provided with a first through hole 11, the second cover 2 is provided with a second through hole 21, the first insulating member 3 is provided with a third through hole 31, and the second conductive member 6 is provided with a fourth through hole. 61.
  • the second insulating member 7 is provided with a fifth through hole 71
  • the third insulating member 8 is provided with a sixth through hole 81
  • the first sealing member 91 is provided with a seventh through hole
  • the second sealing member 92 is provided with an eighth through hole.
  • the connecting post 51 passes through the seventh through hole, the fifth through hole 71, the first through hole 11, the third through hole 31, the second through hole 21, the sixth through hole 81, the eighth through hole and the fourth through hole in sequence.
  • the through hole 61 is connected to the second conductive member 6
  • the limiting portion 52 is used to limit the movement of the first conductive member 5 along the axis direction of the first through hole 11 .
  • the first cover plate 1, the second cover plate 2, the first insulating member 3, the limiting portion 52 of the first conductive member 5, the second conductive member 6, the second insulating member 7 and the third insulating member 8 are all square shapes. .
  • the first electrode assembly 40 in the first housing 20 and the second electrode assembly 50 in the second housing 30 are electrically connected through the first conductive member 5 and the second conductive member 6 .
  • the first sealing member 91 is disposed between the limiting portion 52 and the second insulating member 7 to ensure a tight connection between the limiting portion 52 of the first conductive member 5 and the second insulating member 7 in the axial direction.
  • the limiting portion 52 isolates the first conductive member 5 from the first cover plate 1 in the axial direction
  • the connecting post 51 isolates the first cover plate 1 and the first conductive member 5 in the radial direction.
  • the second sealing member 92 is disposed between the second conductive member 6 and the third insulating member 8 to ensure a tight connection between the second conductive member 6 and the third insulating member 8 in the axial direction.
  • the second conductive member 6 and the second cover plate 2 are isolated, and the connecting posts 51 isolate the second cover plate 2 and the first conductive member 5 in the radial direction.
  • the anti-rotation device 4 includes an anti-rotation component 41 , a first groove 42 and a second groove 43 .
  • the anti-rotation component 41 includes a first protruding part 411 , a second protruding part 412 and an intermediate part 413 connected between the first protruding part 411 and the second protruding part 412 .
  • the first groove 42 is provided on the first cover 1 and opens toward the first insulating member 3 .
  • the second groove 43 is provided on the second cover 2 , and its opening faces the first insulating member 3 .
  • the first insulating member 3 is provided with a mounting hole 44, the anti-rotation component 41 is installed in the mounting hole 44, and the first protruding portion 411 protrudes from the surface of the first insulating member 3 close to the first cover 1, and the second The protruding portion 412 protrudes from the surface of the first insulating member 3 close to the second cover plate 2 , the first protruding portion 411 is inserted into the first groove 42 , and the second protruding portion 412 is inserted into the second groove 43 .
  • anti-rotation components 41 are provided on both sides of the third through hole 31 .
  • the first protruding portion 411 and the second protruding portion 412 of the anti-rotation component 41 are respectively formed from both sides of the first insulating member 3 . bulge.
  • neither of the two anti-rotation components 41 is disposed on the transverse centerline of the first insulating member 3 .
  • the height of the second protruding portion 412 protruding from the first insulating member 3 is H.
  • the centers of the two anti-rotation components and the third through hole 31 are on the same straight line, and this straight line is inclined relative to the transverse centerline of the first insulating member 3 .
  • the diameter of the connecting post 51 is D1
  • the distance between the connecting post 51 and the first protruding portion 411 on the right side is d
  • the distance between the connecting post 51 and the first protruding portion 411 on the right side is d.
  • the distance in the length direction is L
  • the distance in the width direction between the connecting post 51 and the first protruding part 411 on the right is W
  • the diameter of the first protruding part 411 is D2
  • the first insulating member The diameter of the mounting hole 44 on 3 is D3.
  • the ratio of the volume V of the first protruding portion 411 to the protruding height H of the first protruding portion 411 protruding from the first insulating member 3 is 1.5 to 1300.
  • the ratio of the diameter D2 of the anti-rotation member 41 to the diameter D3 of the mounting hole 44 is 0.8 to 1.
  • the ratio of the distance d between the first protrusion 411 and the connecting post 51 to the diameter D1 of the connecting post 51 is 0.5-20.
  • the ratio of the diameter D2 of the first protrusion 411 to the diameter D1 of the connecting post 51 is 0.01 ⁇ 0.98.
  • the ratio of the diameter D2 of the first protruding part 411 to the protruding height H of the first protruding part 411 is 0.1 ⁇ 10.
  • the ratio of the volume V of the first protrusion 411 to the diameter D2 of the first protrusion 411 is 2-400.
  • the ratio of distance W to distance L is greater than or equal to 0.01.
  • the end cover assembly embodiment provided by the present application has a high torsion resistance and can effectively prevent relative rotation between the first insulating member and the first cover plate and between the first insulating member and the second cover plate, thus improving the first
  • the anti-twisting ability between the cover plate and the second cover plate improves the anti-twisting ability of the entire battery cell, avoids dangerous accidents such as leakage of the battery cell, and improves the safety performance of the battery cell.

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Abstract

本申请实施例提供一种端盖组件、电池单体、电池和用电装置，其中，端盖组件包括第一盖板、第二盖板、第一绝缘件和防转装置，第一盖板用于封闭第一壳体，第二盖板用于封闭第二壳体，第二盖板与第一盖板沿第一方向相对设置，以用于使第一盖板封闭的第一壳体与第二盖板封闭的第二壳体沿第一方向排布，第一绝缘件设置于第一盖板和第二盖板之间，防转装置设置于第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间，以防止第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间发生相对转动。

Description

端盖组件、电池单体、电池和用电装置 技术领域
本申请涉及电池技术领域，特别是涉及一种端盖组件、电池单体、电池和用电装置。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。对于电动车辆而言，电池技术又是关乎其发展的一项重要因素。
电池在使用过程中，一些组成部件之间的相对稳定性关系着电池的结构稳定性；特别是对于一些组合类型的电池单体，其外壳一般由至少两个壳体收尾连接形成，且相邻两个外壳之间通过一个具有集成结构的端盖连接，该类端盖通常包括相对设置的两个端盖板，两个端盖板分别用于盖合相邻的两个壳体的开口。这些组成部件之间的相对稳定性关系，直接影响着电池单体的结构稳定性。
发明内容
本申请提供一种端盖组件、电池单体、电池和用电装置，可以保持第一盖板和第一绝缘件之间以及第二盖板和第二绝缘件之间的相对稳定性，提高电池单体的结构稳定性。
第一方面，本申请提供一种端盖组件，包括第一盖板、第二盖板、第一绝缘件和防转装置，第一盖板用于封闭第一壳体，第二盖板用于封闭第二壳体，第二盖板与第一盖板沿第一方向相对设置，第一绝缘件设置于 第一盖板和第二盖板之间，防转装置设置于第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间，以防止第一绝缘件和第一盖板之间相对转动以及第一绝缘件和第二盖板之间相对转动。
该实施例中，通过第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间设置防转装置，可以防止第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间发生相对转动，进而提高端盖组件和装配有该端盖组件的电池单体的抗扭转能力，提高电池单体的结构稳定性。
在一些实施例中，防转装置包括防转部件、设置于第一盖板的第一凹槽、设置于第二盖板的第二凹槽，防转部件设置于第一绝缘件上，且防转部件包括凸出于第一绝缘件并至少部分插入第一凹槽的第一凸起部以及凸出于第一绝缘件并至少部分插入第二凹槽的第二凸起部。
通过设置第一凸起部，并使第一凸起部的至少部分插入第一凹槽中，可以用于防止第一绝缘件和第一盖板发生相对转动；通过设置第二凸起部，并使第二凸起部的至少部分插入第二凹槽中，可以用于防止第一绝缘件和第二盖板发生相对转动。
在一些实施例中，第一凸起部和第一绝缘件一体成型；和/或，第二凸起部和第一绝缘件一体成型。
该实施例可以省略将第一凸起部和第一绝缘件以及第二凸起部和第一绝缘件分别连接的步骤，可以简化组装步骤，提高组装效率。
在一些实施例中，第一绝缘件上开设有安装孔，防转部件还包括插设于安装孔中的中间部，第一凸起部、第二凸起部及中间部一体成型。
该实施例中，通过将第一凸起部、第二凸起部及中间部设置为一体成型，可以使防转部件作为一个整体的独立部件，便于防转部件的单独制造，还可以避免将其分隔为第一凸起部和第二凸起部而带来的零部件数量较多和安装复杂的问题。
在一些实施例中，防转部件呈圆柱体形状，防转部件的直径D2与安装孔的直径D3的比值为0.8～1。
该实施例中，在D2与D3的比值小于0.8时，防转部件和安装孔的孔壁之间的间隙较大，在防转部件受到扭转力时，防转部件会有一定的位移，进而可能会导致装配有该端盖组件的电池单体和电池包中的其他部件发生干涉。在D2与D3的比值大于1时，此时防转部件和安装孔的孔壁之间相当于无间隙甚至达到过盈配合，这会导致防转部件无法装配到安装孔、第一凹槽或第二凹槽中。
在一些实施例中，第一凸起部的体积V与第一凸起部凸出于第一绝缘件的凸出高度H的比值为1.5～1300。
该实施例中，V与H的比值小于1.5时，会使第一凸起部凸出于第一绝缘件的部分的直径过小或第一凸起部凸出于第一绝缘件的凸出高度H太高，进而影响第一凸起部自身的结构强度。而在V与H的比值大于1300时，则会使第一凸起部凸出于第一绝缘件的凸出高度太矮，进而防扭转的效果不好，而且此时第一凸起部容易从第一凹槽或第二凹槽中滑出。
在一些实施例中，端盖组件还包括连接柱，第一盖板设有第一通孔，第二盖板设有第二通孔，第一绝缘件设有第三通孔，连接柱依次穿过第一通孔、第三通孔和第二通孔，以用于电连接设置于第一壳体内的第一电极组件和设置于第二壳体内的第二电极组件。
该实施例通过设置连接柱，实现了设置于第一壳体内的第一电极组件和设置于第二壳体内的第二电极组件之间的电连接。而且，该连接柱还可以与防转装置配合实现防止第一绝缘件和第一盖板以及第一绝缘件和第二盖板发生相对转动的作用。
在一些实施例中，连接柱呈圆柱体形状，第一凸起部及第二凸起部两者中的至少一者与连接柱之间的间隔距离为d，连接柱的直径为D1；其 中，d与D1的比值为0.5～20。
该实施例中，d与D1的比值控制在0.5-20之间，可以实现较佳的抗扭转能力。在d与D1的比值小于0.5时，说明第一凸起部及第二凸起部两者中的至少一者距离连接柱较近，从扭矩公式T＝F*L(T为扭矩，F为受力，L为扭矩)可知，当防转部件45的受力一定的情况下，距离L越短，抗扭转能力T越差。在d与D1的比值大于20时，说明第一凸起部及第二凸起部两者中的至少一者距离连接柱较远，此时第一凸起部及第二凸起部两者中的至少一者太靠近第一绝缘件的边缘，会导致第一凹槽和第二凹槽的局部壁厚太薄，强度不佳。
在一些实施例中，第一凸起部和第二凸起部呈圆柱体形状。
在一些实施例中，连接柱呈圆柱体形状，第一凸起部及第二凸起部两者中的至少一者的直径为D2，连接柱的直径为D1；其中，D2与D1比值为0.01～0.98。
在该实施例中，D2与D1的比值小于0.01时，第一凸起部及第二凸起部两者中的至少一者的直径较小，抗扭转的效果较差。D2与D1的比值大于0.98时，第一凸起部及第二凸起部两者中的至少一者的直径较大，占用空间较大，会减小其他部件的空间，还会导致设置有安装孔的第一绝缘件、设置有第一凹槽的第一盖板和设置有第二凹槽的第二盖板的局部强度不足。
在一些实施例中，第一凸起部的直径D2与第一凸起部的凸出高度H的比值为0.1～10。
在该实施例中，D2与H的比值小于0.1时，第一凸起部的直径过小或第一凸起部的凸出高度太高，会降低第一凸起部自身的结构强度。D2与H的比值大于10时，则会使第一凸起部的凸出高度太矮，防扭转效果不好，而且此时第一凸起部容易从第一凹槽中滑出。
在一些实施例中，第一凸起部的体积V与第一凸起部的直径D2的比值为2～400。
在该实施例中，V与D2的比值小于2时，会使第一凸起部的高度凸出太矮，防扭转效果不好，而且此时第一凸起部容易从第一凹槽中滑出。而V与D2的比值大于400时，则会使第一凸起部的直径过小或第一凸起部的凸出高度太高，降低第一凸起部自身的结构强度。
在一些实施例中，第一绝缘件呈方形结构，在第一绝缘件的长度方向上，防转部件和连接柱的间隔距离为L；在第一绝缘件的宽度方向上，防转部件和连接柱的间隔距离为W；其中，W与L的比值大于或等于0.01。
该实施例中，在W与L的比值小于0.01时，防转部件与连接柱接近于位于同一水平线上，此时的抗扭转效果较差。
第二方面，本申请提供一种电池单体，包括上述的端盖组件。
第三方面，本申请提供一种电池，包括箱体和上述的电池单体，电池单体设置于箱体中，电池单体用以提供电能。
第四方面，本申请提供一种用电装置，包括上述的电池单体，电池单体用于向用电装置供应电能；或者，包括上述的电池，电池用于向用电装置供应电能。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施 例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，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，还可以根据附图获得其他的附图。
图1是本申请公开的用电装置一些实施例的结构示意图；
图2是本申请公开的电池一些实施例的结构示意图；
图3是本申请公开的电池单体一些实施例的爆炸图；
图4是本申请公开的电池单体一些实施例的结构示意图；
图5是本申请公开的电池单体一些实施例的俯视图；
图6是图5中沿A-A截面的剖视图；
图7是本申请公开的端盖组件一些实施例的爆炸图；
图8是图7实施例中防转部件安装于第一绝缘件后的爆炸图；
图9是图7实施例中第一绝缘件的结构示意图；
图10是本申请公开的端盖组件一些实施例的结构示意图；
图11是本申请公开的端盖组件一些实施例的俯视图；
图12是图11中沿B-B截面的剖视图；
图13是本申请公开的端盖组件一些实施例中第一绝缘件的主视图；
图14是本申请公开的端盖组件另一些实施例的俯视图；
图15是图14中沿C-C截面的剖视图；
图16是本申请公开的端盖组件一些实施例的侧视图；
图17是图16中沿D-D截面的剖视图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
1000、车辆；100、电池；200、车桥；300、车轮；400、马达；500、控制器；
101、电池单体；102、箱体；102a、箱体本体；102b、盖体；
10、端盖组件；20、第一壳体；30、第二壳体；40、第一电极组件；50、第二电极组件；60、第一端盖组件；70、第二端盖组件；
1、第一盖板；11、第一通孔；2、第二盖板；21、第二通孔；3、第一绝缘件；31、第三通孔；4、防转装置；41、防转部件；411、第一凸起部；412、第二凸起部；413、中间部；42、第一凹槽；43、第二凹槽；44、安装孔；5、第一导电件；51、连接柱；52、限位部；6、第二导电件；61、第四通孔；7、第二绝缘件；71、第五通孔；8、第三绝缘件；81、第六通孔；91、第一密封件；92、第二密封件。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文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；本文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。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。此外，术语“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
在本文中提及“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。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，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，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上，除非另有明确具体的限定。同理，“多组”指的是两组以上，“多片”指的是两片以上，除非另有明确具体的限定。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；也可以是机械连接，也可以是电连接；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或两个元件的相互作用关系。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实施例中的具体含义。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
本申请的发明人注意到，随着动力电池所应用范围的不断扩增，各 种用电装置对电池容量的需求也在不断提升。为了在有限的存储空间内尽可能提高电池的容量，人们开始将电池单体设置为包括两个电芯的结构形式，两个电芯串联连接，可以节省一部分中间的电连接部件，也为电池节省一部分空间，从而为提高电池容量提供支持。
由于包含两个电芯而使得电池单体的长度比包含一个电芯的电池单体的长度要长一些，因此在使用过程中，电池单体可能会因受到侧向的剪切力而使两个串联连接的电芯发生相对扭转，影响电池单体的整体质量和使用安全性。
发明人经过研究发现，可以在第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间设置防转装置，以防止第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间发生相对转动，进而提高端盖组件和装配有该端盖组件的电池单体的抗扭转能力。
本申请实施例公开的端盖组件适用于电池单体、电池以及使用电池的用电装置。
用电装置可以是手机、便携式设备、笔记本电脑、电瓶车、电动汽车、轮船、航天器、电动玩具和电动工具等等，例如，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。
如图1所示，用电装置可以是车辆1000，例如新能源汽车，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；或者用电装置也可以是无人机或轮船等。具体地，车辆1000可包括电池100、车桥200、连接于车桥200的车轮300、马达400和控制器500，控制器500用于控制马达400工作，马达400用于驱动车桥200转动，车桥200转动带动车轮300转动，电池100可以设置在车辆1000的底部、头部或尾部，用于为马达400以及车辆中其它部件的工作提供电能。
如图2所示，电池100包括电池单体101和箱体102。在电池100 中，电池单体101可以是一个，也可以是多个。若电池单体101为多个，多个电池单体101之间可串联或并联或混联，混联是指多个电池单体101中既有串联又有并联，可以是多个电池单体101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102内。也可以是所有电池单体101之间直接串联或并联或混联在一起，再将所有电池单体101构成的整体容纳于箱体102内。
箱体102内部为中空结构，例如，箱体102可以包括箱体本体102a和盖体102b。箱体本体102a和盖体102b扣合在一起。例如，箱体本体102a和盖体102b均可以为中空长方体且各自只有一个面为开口面，箱体本体102a的开口和盖体102b的开口相对设置，并且箱体本体102a和盖体102b相互扣合形成具有封闭腔室的箱体本体。也可以为，箱体本体102a为具有开口的长方体而盖体102b为板状，或者盖体102b为具有开口的长方体而箱体本体102a为板状，箱体本体102a和盖体102b相对设置并扣合而形成具有封闭腔室的箱体102。至少一个电池单体101相互并联或串联或混联组合后，置于箱体本体102a和盖体102b扣合后形成的封闭腔室内。
其中，电池单体101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，本公开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，本公开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、方体方形电池单体和软包电池单体，本公开实施例对此也不限定。
在一些实施例中，如图3至图6所示，电池单体包括端盖组件10、第一壳体20、第二壳体30、第一电极组件40、第二电极组件50、第一端盖组件60和第二端盖组件70。
第一壳体20和第二壳体30均具有开口，第一电极组件40容纳于第一壳体20的内部，第二电极组件50容纳于第二壳体30的内部。
第一壳体20和第二壳体30具有相对设置的开口，端盖组件10设置于第一壳体20和第二壳体30之间。第一端盖组件60和第二端盖组件70分别设置于第一壳体20和第二壳体30的远离彼此的开口处。
第一壳体20和第二壳体30内分别填充电解液。第一电极组件40和第二电极组件50均可以由极性相反的第一极片和第二极片层叠或卷绕形成，并且通常在第一极片与第二极片之间设有隔膜。第一极片和第二极片涂覆有涂覆的部分构成第一电极组件40和第二电极组件50的主体部，第一极片和第二极片未涂覆的部分各自构成两种极性相反的极耳。第一电极组件40上的第一极耳和第二电极组件50上的第二极耳通过端盖组件10实现电连接，第一电极组件40的另一极耳与第一端盖组件60上的端子连接，第二电极组件50的另一极耳与第二端盖组件70上的端子连接。
第一壳体20和第二壳体30可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，第一壳体20和第二壳体30的形状可以根据第一电极组件40和第二电极组件50的具体形状和尺寸大小来确定。第一壳体20和第二壳体30的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
为了能够更清楚地理解本申请电池单体的改进原理，首先对端盖组件的结构进行详细说明。
参考图7至图9所示，在本申请的一些实施例中，端盖组件10包括第一盖板1、第二盖板2、第一绝缘件3和防转装置4，第一盖板1用于封闭第一壳体20，第一壳体20用于容纳第一电极组件40，第二盖板2用于封闭第二壳体30，第二壳体30用于容纳第二电极组件50，第二盖板2与第一盖板1沿第一方向相对设置，以用于使第一盖板1所封闭的第一壳体20与第二盖板2所封闭的第二壳体30沿第一方向排布，第一绝缘件3设置于第一盖板1和第二盖板2之间，防转装置4设置于第一绝缘件3和第一盖板1之间以及第一绝缘件3和第二盖板2之间，以防止第一绝缘件3和第一盖板1之间以及第一绝缘件3和第二盖板2之间发生相对转动。
该实施例中，通过第一绝缘件3和第一盖板1之间以及第一绝缘件3和第二盖板2之间设置防转装置4，可以防止第一绝缘件3和第一盖板1的相对转动以及第一绝缘件3和第二盖板2的相对转动，保持第一绝缘件3和第一盖板1之间以及第一绝缘件3和第二盖板2之间的相对稳定性，即保持第一盖板1和第二盖板2之间的相对稳定性，进而提高端盖组件和 装配有该端盖组件的电池单体的抗扭转能力，提高电池单体的结构稳定性。
设置于第一绝缘件3和第一盖板1之间的防转装置4，可以防止第一绝缘件3和第一盖板1的相对转动。设置于第一绝缘件3和第二盖板2之间的防转装置4，可以防止第一绝缘件3和第二盖板2的相对转动。在第一绝缘件3和第一盖板1之间的相对转动以及第一绝缘件3和第二盖板2之间的相对转动均在一定程度上被限制后，第一盖板1和第二盖板2之间的抗扭转能力也得到了提高，与第一盖板1连接的第一壳体20和与第二盖板2连接的第二壳体30之间的抗扭转能力也得到了提高，从而有效提高整个电池单体的抗扭转能力，改善电池单体的质量。
其中，第一盖板1用于封闭第一壳体20，第一盖板1和第一壳体20形成基本封闭的空间，该空间内可以容纳第一电极组件40、电解液及其他部件。第二盖板2用于封闭第二壳体30，第二盖板2和第二壳体30形成基本封闭的空间，该空间内可以容纳第二电极组件50、电解液及其他部件。
第一壳体20和第二壳体30可以是多种形状和多种尺寸的，例如长方体形、圆柱体形、六棱柱形等。具体地，第一壳体20和第二壳体30的形状和尺寸大小可以根据第一电极组件40和第二电极组件50的具体形状和尺寸大小来确定。第一壳体20和第二壳体30的形状可以相同，也可以不同。第一壳体20和第二壳体30的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
第一盖板1和第二盖板2的形状和尺寸大小可以有多种选择，比如可以为圆形、方形、五边形或者六边形等。具体地，第一盖板1和第二盖板2的形状和尺寸大小可以根据第一壳体20和第二壳体30的形状和尺寸大小来确定。第一盖板1和第二盖板2的形状可以相同，也可以不同。第一盖板1和第二盖板2的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
第一绝缘件3的形状和尺寸大小也可以有多种选择，比如可以为圆形、方形、五边形或者六边形等。第一绝缘件3的形状和尺寸大小与第一 盖板1和第二盖板2的形状和尺寸大小可以相同，也可以不同。第一绝缘件3的材质可以是多种，比如，塑料、橡胶、陶瓷等，本申请实施例对此不作特殊限制。
第一绝缘件3设置于第一盖板1和第二盖板2之间，第一盖板1在第一绝缘件3的正投影面积可以大于、小于或等于第一绝缘件3的表面积。第二盖板2在第一绝缘件3的正投影面积可以大于、小于或等于第一绝缘件3的表面积。
第一绝缘件3的两侧可以分别与第一盖板1和第二盖板2接触；或者，第一绝缘件3的两侧分别与第一盖板1和第二盖板2之间具有间隙，该间隙内可以分别布置有其他部件。
防转装置4的具体结构可以有多种选择，下面结合几个实施例进行说明。
如图7至图9所示，在一些实施例中，防转装置4包括防转部件41、设置于第一盖板1的第一凹槽42、设置于第二盖板2的第二凹槽43，防转部件41设置于第一绝缘件3上，且防转部件41包括凸出于第一绝缘件3并至少部分插入第一凹槽42的第一凸起部411以及凸出于第一绝缘件3并至少部分插入第二凹槽43的第二凸起部412。
通过设置第一凸起部411，并使第一凸起部411的至少部分插入第一凹槽42中，可以用于防止第一绝缘件3和第一盖板1发生相对转动；通过设置第二凸起部412，并使第二凸起部412的至少部分插入第二凹槽43中，可以用于防止第一绝缘件3和第二盖板2发生相对转动。
其中，第一凸起部411的形状与第一凹槽42的形状相互配合，第二凸起部412的形状与第二凹槽43的形状相互配合。
该实施例中，第一凸起部411、第一凹槽42、第二凸起部412和第二凹槽43的数量可以有多种选择。第一凸起部411和第一凹槽42的数量相等，比如可以为一个、两个或多个。第二凸起部412和第二凹槽43的数量相等，比如可以为一个、两个或多个。第一凸起部411和第一凹槽42的数量与第二凸起部412和第二凹槽43的数量可以相同，也可以不同。
在一些实施例中，第一凸起部411与第一凹槽42之间为非转动配 合，以防止第一绝缘件3和第一盖板1发生相对转动；第二凸起部412与第二凹槽43之间为非转动配合，以防止第一绝缘件3和第一盖板1发生相对转动。比如，第一凸起部411为方形结构，第一凹槽42为方形槽；第二凸起部412为方形结构，第二凹槽43为方形槽。
在其他实施例中，第一凸起部411和第二凸起部412还可以为三棱柱、五棱柱等形状，对应地第一凹槽42和第二凹槽43为三角形槽或者五边形槽等。
在一些实施例中，第一凸起部411与第一凹槽42的数量均为至少两个，以防止第一绝缘件3和第一盖板1发生相对转动；第二凸起部412与第二凹槽43的数量均为至少两个，以防止第一绝缘件3和第一盖板1发生相对转动。
在一些实施例中，端盖组件10还包括连接柱51，第一盖板1设有第一通孔11，第二盖板2设有第二通孔21，第一绝缘件3设有第三通孔31，连接柱51依次穿过第一通孔11、第三通孔31和第二通孔21，以用于使设置于第一壳体20内的第一电极组件40和设置于第二壳体30内的第二电极组件50电连接，第一凸起部411与第一凹槽42的数量均为一个，由于第一凸起部411的转动轴线和连接柱51的转动轴线不共线，因此这样也可以防止第一绝缘件3和第一盖板1发生相对转动；第二凸起部412与第二凹槽43的数量均为一个，由于第二凸起部412的转动轴线和连接柱51的转动轴线不共线，因此也可以防止第一绝缘件3和第一盖板1发生相对转动。
当然，在一些实施例中，在包括连接柱51的前提下，第一凸起部411与第一凹槽42的数量以及第二凸起部412与第二凹槽43的数量也可以为两个或多个，以提高防转效果。
如图9所示，在一些实施例中，防转装置4的数量为两个，第一绝缘件3的第一截面呈方形，两个防转装置4在第一截面上的投影间隔地位于第一截面的对角线上。
其中，第一截面为经过第一绝缘件3的面。具体地，第一截面可以有多种选择，该实施例中呈方形的第一截面作为参考面，在该参考面 上，两个防转装置4的投影间隔地位于该方形的参考面的对角线上。比如，在第一绝缘件3为方形的板状结构时，第一截面可以为第一绝缘件3的靠近第一盖板1的外表面，也可以为第一绝缘件3的靠近第二盖板2的外表面，还可以为位于第一绝缘件3的靠近第一盖板1的外表面和第一绝缘件3的靠近第二盖板2的外表面之间且与第一绝缘件3的靠近第一盖板1的外表面和第一绝缘件3的靠近第二盖板2的外表面平行的面。
通过设置两个防转装置4，可以进一步提高端盖组件10的抗扭转能力。在第一绝缘件3的第一截面呈方形时，将两个防转装置4在第一截面上的投影设置为间隔地位于第一截面的对角线上，可以进一步提升抗扭转能力。
在一些实施例中，端盖组件还包括连接柱51，第一盖板1设有第一通孔11，第二盖板2设有第二通孔21，第一绝缘件3设有第三通孔31，连接柱51依次穿过第一通孔11、第三通孔31和第二通孔21，以使设置于第一壳体20内的第一电极组件40和设置于第二壳体30内的第二电极组件50之间实现电连接，两个防转装置4和连接柱51在第一截面上的投影共线。
通过将两个防转装置4和连接柱51在第一截面上的投影设置为共线，可以进一步提升端盖组件10的抗扭转能力。
在一些实施例中，第一凸起部411和第一绝缘件3一体成型；和/或，第二凸起部412和第一绝缘件3一体成型。
该实施例可以省略将第一凸起部411和第一绝缘件3以及第二凸起部412和第一绝缘件3分别连接的步骤，可以简化组装步骤，提高组装效率。
在一些实施例中，第一绝缘件3上开设有安装孔44，防转部件41还包括插设于安装孔44中的中间部413，第一凸起部411、第二凸起部412及中间部413一体成型。
该实施例中，通过将第一凸起部411、第二凸起部412及中间部413设置为一体成型，可以使防转部件41作为一个整体的独立部件，便于防转部件41的单独制造，还可以避免将其分隔为第一凸起部411和第二凸 起部412而带来的零部件数量较多和安装复杂的问题。
如图13和图17所示，在一些实施例中，防转部件41呈圆柱体形状，防转部件41的直径D2与安装孔44的直径D3的比值为0.8～1。
比如，D2与D3的比值可以为0.8、0.82、0.84、0.86、0.88、0.9、0.91、0.92、0.93、0.94、0.95、0.96、0.97、0.98、0.99、1等。
经发明人大量实验表明，该实施例中，在D2与D3的比值小于0.8时，防转部件41和安装孔44的孔壁之间的间隙较大，在防转部件41受到扭转力时，防转部件41会有一定的位移，进而可能会导致装配有该端盖组件的电池单体和电池包中的其他部件发生干涉。在D2与D3的比值大于1时，此时防转部件41和安装孔44的孔壁之间相当于无间隙甚至达到过盈配合，这会导致防转部件41无法装配到安装孔44、第一凹槽42或第二凹槽43中。
在一些实施例中，防转部件41的直径D2可以为0.5～30。
比如，防转部件41的直径D2可以为0.5、1、2、3、4、5、6、7、8、9、10、11、12、13、14、15、16、17、18、19、20、21、22、23、24、25、26、27、28、29、30等。
在一些实施例中，安装孔44的直径D3可以为0.7～35。
比如，安装孔44的直径D3可以为0.7、1、2、4、4.1、4.2、4.5、4.8、5、5.1、5.5、6、8、10、12、14、16、18、20、22、24、26、28、30、31、32、33、34、35等。
如下表1所示，为D2与D3的比值不满足0.8～1的对比例01至06和D2与D3的比值满足0.8～1的实施例01至03的对比结果。
表1 对比例02至06和实施例01至03的对比结果
Figure PCTCN2022117825-appb-000001
Figure PCTCN2022117825-appb-000002
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例01至03中，防转部件41和安装孔44之间的间隙较大，在使用过程中，防转部件41在安装孔44中会发生扭动和移动，从而影响防转效果。
在对比例04至06中，防转部件41和安装孔44之间存在过盈，会导致防转部件41无法装配到安装孔44中的情况，从而影响防转效果。
而在实施例01至03中，防转部件41的直径D2与安装孔44的直径D3的比值满足0.8～1，因此防转部件41和安装孔44之间的配合适当，防转效果较好。
在一些实施例中，第一凸起部411的体积V与第一凸起部411凸出于第一绝缘件3的凸出高度H的比值为1.5～1300。
比如，第一凸起部411的体积V与第一凸起部411凸出于第一绝缘件3的凸出高度H的比值可以为1.5、1.6、1.8、2.0、10、100、200、300、400、500、600、700、800、900、1000、1100、1200、1300等。
经发明人大量实验表明，该实施例中，V与H的比值小于1.5时，会使第一凸起部411凸出于第一绝缘件3的部分的直径过小或第一凸起部411凸出于第一绝缘件3的凸出高度H太高，进而影响第一凸起部411自身的结构强度。而在V与H的比值大于1300时，则会使第一凸起部411凸出于第一绝缘件3的凸出高度太矮，进而防扭转的效果不好，而且此时第一凸起部411容易从第一凹槽42或第二凹槽44中滑出。
在一些实施例中，第一凸起部411的体积V可以为6～13000。
比如，第一凸起部411的体积V可以为6、8、10、100、500、 1000、2000、4000、6000、8000、10000、11000、12000、13000等。
在一些实施例中，第一凸起部411凸出于第一绝缘件3的凸出高度H可以为1～10。
比如，第一凸起部411凸出于第一绝缘件3的凸出高度H可以为1、2、3、4、5、6、7、8、9、10等。
如下表2所示，为V与H的比值不满足1.5～1300的对比例11至16和V与H的比值满足1.5～1300的实施例11至14的对比结果。
表2 对比例11至16和实施例11至14的对比结果
Figure PCTCN2022117825-appb-000003
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例11至13中，第一凸起部411占用的高度空间较大，因此会影响电池单体的能量密度；而且，第一凸起部411的防转直径较小，强度较低，可承受的扭力极限值为1N·m，此时第一凸起部411极易断裂，防转效果不佳。
在对比例14至16中，第一凸起部411占用的长宽空间较大，也会影响电池单体的能量密度；而且，第一凸起部411的防转直径过大，高 度较低，高宽比小，可承受的扭力极限值为2N·m，此时第一凸起部411极易从第一凹槽42中滑出，防转效果不佳。
而在实施例11至14中，第一凸起部411的体积V与第一凸起部411凸出于第一绝缘件3的凸出高度H的比值满足1.5～1300，高宽比合适，可承受的扭力满足需求，第一凸起部411既不容易断裂，也不容易从第一凹槽42中滑出，因此防转效果较好。
在一些实施例中，第二凸起部412的体积V与第二凸起部412凸出于第一绝缘件3的凸出高度H的比值也可以设置为1.5～1300。
在一些实施例中，端盖组件10还包括连接柱51，第一盖板1设有第一通孔11，第二盖板2设有第二通孔21，第一绝缘件3设有第三通孔31，连接柱51依次穿过第一通孔11、第三通孔31和第二通孔21，以用于电连接设置于第一壳体20内的第一电极组件40和设置于第二壳体30内的第二电极组件50。
该实施例通过设置连接柱51，实现了设置于第一壳体20内的第一电极组件40和设置于第二壳体30内的第二电极组件50之间的电连接。而且，该连接柱51还可以与防转装置4配合实现防止第一绝缘件3和第一盖板1以及第一绝缘件3和第二盖板2发生相对转动的作用。
在一些实施例中，连接柱51呈圆柱体形状，第一凸起部411及第二凸起部412两者中的至少一者与连接柱51之间的间隔距离为d，连接柱51的直径为D1；其中，d与D1的比值为0.5～20。
比如，d与D1的比值可以为0.5、1、2、3、4、5、6、7、8、9、10、11、12、13、14、15、16、17、18、19、20等。
经发明人大量实验表明，该实施例中，d与D1的比值控制在0.5-20之间，可以实现较佳的抗扭转能力。在d与D1的比值小于0.5时，说明第一凸起部411及第二凸起部412两者中的至少一者距离连接柱51较近，从扭矩公式T＝F*L(T为扭矩，F为受力，L为扭矩)可知，当防转部件45的受力一定的情况下，距离L越短，抗扭转能力T越差。在d与D1的比值大于20时，说明第一凸起部411及第二凸起部412两者中的至少一者距离连接柱51较远，此时第一凸起部411及第二凸起部412两者中 的至少一者太靠近第一绝缘件3的边缘，会导致第一凹槽42和第二凹槽43的局部壁厚太薄，强度不佳。
该实施例包括三种情况，一是，连接柱51呈圆柱体形状，第一凸起部411与连接柱51之间的间隔距离为d1，连接柱51的直径为D1；其中，d1与D1的比值为0.5～20；二是，连接柱51呈圆柱体形状，第二凸起部412与连接柱51之间的间隔距离为d2，连接柱51的直径为D1；其中，d2与D1的比值为0.5～20；三是，连接柱51呈圆柱体形状，第一凸起部411与连接柱51之间的间隔距离为d1，连接柱51的直径为D1；其中，d1与D1的比值为0.5～20；且第二凸起部412与连接柱51之间的间隔距离为d2，连接柱51的直径为D1；其中，d2与D1的比值为0.5～20。
在一些实施例中，第一凸起部411及第二凸起部412两者中的至少一者与连接柱51之间的间隔距离d可以为1～600。
比如，d可以为1、50、100、150、200、250、300、350、400、450、500、550、600等。
在一些实施例中，连接柱51的直径D1可以为1～30。
比如，D1可以为1、2、5、7、19、12、15、17、20、22、25、27、30等。
以第一凸起部411为例，如下表3所示，为d与D1的比值不满足0.5～20的对比例31至36和d与D1的比值满足0.5～20的实施例31至34的对比结果。
表3 对比例31至36和实施例31至34的对比结果
Figure PCTCN2022117825-appb-000004
Figure PCTCN2022117825-appb-000005
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例31至33中，第一凸起部411距离连接柱51较近，根据扭矩公式T＝F*L可知，此时第一凸起部411容易从第一凹槽42中滑出，防转效果不佳。
在对比例34至36中，第一凸起部411距离连接柱51较远，此时，第一凸起部411太靠近边缘，会导致第一凹槽42的局部壁厚太薄，强度不佳；而且，力臂较长，此时第一凸起部411的可承受的扭力极限值为2.5N·m，第一绝缘件3的中部可能会发生变形，防转效果不佳。
而在实施例31至34中，第一凸起部411与连接柱51之间的间隔距离d与连接柱51的D1的比值满足0.5～20，力臂长度合适，防转效果好。
在一些实施例中，第一凸起部411和第二凸起部412呈圆柱体形状。
该实施例中，通过将第一凸起部411和第二凸起部412均设置为圆柱体形状，可以方便第一凸起部411和第二凸起部412的制造和装配。
在其他实施例中，第一凸起部411和第二凸起部412也可以为方形或者三棱柱等其他形状。
在一些实施例中，连接柱51呈圆柱体形状，第一凸起部411及第二凸起部412两者中的至少一者的直径为D2，连接柱51的直径为D1；其中，D2与D1比值为0.01～0.98。
比如，D2与D1比值可以为0.01、0.03、0.05、0.07、0.09、0.1、0.2、0.3、0.4、0.5、0.6、0.7、0.8、0.9、0.91、0.92、0.93、0.94、0.95、0.96、0.97、0.98等。
经发明人大量实验表明，在该实施例中，D2与D1的比值小于0.01时，第一凸起部411及第二凸起部412两者中的至少一者的直径较小，抗扭转的效果较差。D2与D1的比值大于0.98时，第一凸起部411及第二凸起部412两者中的至少一者的直径较大，占用空间较大，会减小其他部件的空间，还会导致设置有安装孔44的第一绝缘件3、设置有第一凹槽42的第一盖板1和设置有第二凹槽43的第二盖板2的局部强度不足。
该实施例包括三种情况，一是，连接柱51呈圆柱体形状，第一凸起部411的直径为D21，连接柱51的直径为D1；其中，D21与D1比值为0.01～0.98；二是，连接柱51呈圆柱体形状，第二凸起部412的直径为D22，连接柱51的直径为D1；其中，D22与D1比值为0.01～0.98；三是，连接柱51呈圆柱体形状，第一凸起部411的直径为D21，连接柱51的直径为D1；其中，D21与D1比值为0.01～0.98；且第二凸起部412的直径为D22，连接柱51的直径为D1；其中，D22与D1比值为0.01～0.98。
以第一凸起部411为例，如下表4所示，为D2与D1的比值不满足0.01～0.98的对比例41至46和D2与D1的比值满足0.01～0.98的实施例41至44的对比结果。
表4 对比例41至46和实施例41至44的对比结果
Figure PCTCN2022117825-appb-000006
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例41至43中，第一凸起部411的直径较小，扭力差，连接柱51的直径过大，占用空间；第一凸起部411可承受的扭力极限值为较小，第一凸起部411的局部可能会发生开裂，防转效果差。
在对比例44至46中，第一凸起部411的直径较大，占用空间大，会导致对应的第一凹槽42的局部强度不足，此时，第一凸起部411可承受的扭力极限值较小，第一绝缘件3局部开裂的风险较大，防转效果不佳。
而在实施例41至44中，第一凸起部411的直径D2与连接柱51的直径D1的比值满足0.01～0.98，因此第一绝缘件3和第一凸起部411的开裂风险较小，防转效果较好。
在一些实施例中，第一凸起部411的直径D2与第一凸起部411的凸出高度H的比值为0.1～10。
比如，第一凸起部411的直径D2与第一凸起部411的凸出高度H的比值可以为0.1、0.2、0.4、0.6、0.8、1、2、3、4、5、6、7、8、9、10等。
经发明人大量实验表明，在该实施例中，D2与H的比值小于0.1时，第一凸起部411的直径过小或第一凸起部411的凸出高度太高，会降低第一凸起部411自身的结构强度。D2与H的比值大于10时，则会使第一凸起部411的凸出高度太矮，防扭转效果不好，而且此时第一凸起部411容易从第一凹槽42中滑出。
如下表5所示，为D2与H的比值不满足0.1～10的对比例51至56和D2与H的比值满足0.1～10的实施例51至54的对比结果。
表5 对比例51至56和实施例51至54的对比结果
Figure PCTCN2022117825-appb-000007
Figure PCTCN2022117825-appb-000008
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例51至53中，第一凸起部411占用的高度空间较大，会影响电池单体的能量密度；且第一凸起部411的直径过小，强度低，可承受的扭力极限值较小，第一凸起部411具有较大的断裂风险，防转效果不佳。
在对比例54至56中，第一凸起部411的高度较矮，第一凸起部411可承受的扭力极限值较小，第一凸起部411容易从第一凹槽42中滑出，防转效果不佳。
而在实施例51至54中，第一凸起部411的直径和高度大小合适，既没有断裂风险，也不容易从第一凹槽42中滑出，因此防转效果较好。
在一些实施例中，第二凸起部412的直径D2与第一凸起部411的凸出高度H的比值也可以设置为0.1～10。
在一些实施例中，第一凸起部411的体积V与第一凸起部411的直径D2的比值为2～400。
比如，第一凸起部411的体积V与第一凸起部411的直径D2的比值可以为2、5、10、20、40、60、80、100、150、200、250、300、 350、400等。
经发明人大量实验表明，在该实施例中，V与D2的比值小于2时，会使第一凸起部411的凸出高度太矮，防扭转效果不好，而且此时第一凸起部411容易从第一凹槽42中滑出。而V与D2的比值大于400时，则会使第一凸起部411的直径过小或第一凸起部411的凸出高度太高，降低第一凸起部411自身的结构强度。
如下表6所示，为V与D2的比值不满足2～400的对比例61至66和V与D2的比值满足2～400的实施例61至64的对比结果。
表6 对比例61至66和实施例61至64的对比结果
Figure PCTCN2022117825-appb-000009
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例61至63中，第一凸起部411的高度太矮，防扭转效果不好，且第一凸起部411的容易从第一凹槽42中滑出，防转效果不佳。
在对比例64和65中，第一凸起部411的防转高度太高，第一凸 起部411可承受的扭力极限值为较小，第一凸起部411具有较大的断裂风险，防转效果不佳；在对比例66中，第一凸起部411占用的高度空间较大，影响电池单体的能量密度。
而在实施例61至64中，第一凸起部411的高度和体积大小合适，既没有断裂风险，也不容易从第一凹槽42中滑出，因此防转效果较好。
在一些实施例中，第二凸起部412的体积V与第二凸起部412的直径D2的比值也可以设置为2～400。
在一些实施例中，第一绝缘件3呈方形结构，在第一绝缘件3的长度方向上，防转部件41两者中的至少一者和连接柱51的间隔距离为L；在第一绝缘件3的宽度方向上，防转部件41和连接柱51的间隔距离为W；其中，W与L的比值大于或等于0.01。
比如，W与L的比值可以为0.01、1、2、5、8、10等。
经发明人大量实验表明，该实施例中，在W与L的比值小于0.01时，防转部件41与连接柱51接近于位于同一水平线上，此时的抗扭转效果较差。
在一些实施例中，在第一绝缘件3的长度方向上，防转部件41两者中的至少一者和连接柱51的间隔距离L可以为0.2～500。
比如，L可以为0.2、0.5、0.8、1、2、5、8、10、50、80、100、200、300、400、500等。
在一些实施例中，在第一绝缘件3的宽度方向上，防转部件41和连接柱51的间隔距离W可以为0.2～500。
比如，W可以为0.2、0.5、0.8、1、2、5、8、10、50、80、100、200、300、400、500等。
如下表7所示，为W与L的比值小于0.01的对比例71至73和W与L的比值大于或等于0.01的实施例71至73的对比结果。
表7 对比例71至73和实施例71至73的对比结果
Figure PCTCN2022117825-appb-000010
Figure PCTCN2022117825-appb-000011
在上表的对比例和实施例中，第一绝缘件3采用PP材料(Polypropylene，聚丙烯)制成，防转部件41采用陶瓷材料制成，第一盖板1和第二盖板2采用铝制成。
根据上述表格中的数据可知，在对比例71至73中，W与L的比值小于0.01，防转部件41可承受的扭力极限值较小，防转部件41容易断裂；而在实施例71至73中，W与L的比值均大于0.01，防转部件41可承受的扭力极限值较大，可见，在W与L的比值大于0.01时，防转部件41可承受的扭力极限值明显增大，因此防转效果显著提升。
如图7和图8所示，在一些实施例中，端盖组件10还包括第一导电件5和第二导电件6，第二导电件6设置于第二盖板2的远离第一绝缘件3的一侧，第一导电件5包括连接柱51和限位部52，限位部52设置于第一盖板1的远离第一绝缘件3的一侧，第一盖板1设有第一通孔11，第二盖板2设有第二通孔21，第一绝缘件3设有第三通孔31，连接柱51依次穿过第一通孔11、第三通孔31和第二通孔21并与第二导电件6连接，限位部52用于限制第一导电件5沿第一通孔11的轴线方向运动。
该实施例中，通过第一导电件5和第二导电件6实现了第一壳体20中的第一电极组件40和第二壳体30中的第二电极组件50之间的电连接。
在一些实施例中，第二导电件6设有第四通孔61，连接柱51穿过第四通孔61实现第一导电件5和第二导电件6的连接。
在一些实施例中，端盖组件10还包括第二绝缘件7和第三绝缘件8，第二绝缘件7设置于第一盖板1和限位部52之间，第三绝缘件8设置于第二盖板2和第二导电件6之间，第二绝缘件7设有第五通孔71，第 三绝缘件8设有第六通孔81，连接柱51穿过第五通孔71和第六通孔81。
该实施例中，通过第二绝缘件7，可以电隔离第一盖板1和第一导电件5的限位部52；通过第三绝缘件8，可以电隔离第二盖板2和第二导电件6。
在一些实施例中，端盖组件10还包括第一密封件91，第一密封件91设置于限位部52和第二绝缘件7之间，第一密封件91设有第七通孔，连接柱51穿过第七通孔，第一密封件91沿轴向嵌入第五通孔71和第一通孔11中，以隔离第一盖板1和限位部52以及第一盖板1和连接柱51；和/或，还包括第二密封件92，第二密封件92设置于第二导电件6和第三绝缘件8之间，第二密封件92设有第八通孔，连接柱51穿过第八通孔，第二密封件92沿轴向嵌入第六通孔81和第二通孔21中，以隔离第二盖板2和第二导电件6以及第二盖板2和连接柱51。
该实施例中，通过设置第一密封件91，可以在轴向方向上使第一导电件5的限位部52和第二绝缘件7之间的紧密连接，在轴向方向上隔离第一导电件5的限位部52和第一盖板1，以及在径向方向上隔离第一盖板1和第一导电件5的连接柱51。通过设置第二密封件92，则可以在轴向方向上使第二导电件6和第三绝缘件8之间的紧密连接，在轴向方向上隔离第二导电件6和第二盖板2，以及在径向方向上隔离第二盖板2和第一导电件5的连接柱51。
下面结合附图3至图17对本申请提供的电池单体和端盖组件的实施例进行说明。
如图3至图6所示，电池单体包括端盖组件10、第一壳体20、第二壳体30、第一电极组件40、第二电极组件50、第一端盖组件60和第二端盖组件70。
第一壳体20和第二壳体30均具有开口，第一电极组件40容纳于第一壳体20的内部，第二电极组件50容纳于第二壳体30的内部。
第一壳体20的开口和第二壳体30的开口相对设置，端盖组件10设置于第一壳体20和第二壳体30之间。第一端盖组件60和第二端盖组件70分别设置于第一壳体20和第二壳体30的远离彼此的开口的一端。
第一壳体20和第二壳体30均为方形的壳体。
如图7和图8所示，端盖组件包括第一盖板1、第二盖板2、第一绝缘件3、防转装置4、第一导电件5、第二导电件6、第二绝缘件7、第三绝缘件8、第一密封件91和第二密封件92。
第一绝缘件3设置于第一盖板1和第二盖板2之间，以使第一盖板1和第二盖板2相绝缘。
第二绝缘件7设置于第一盖板1的远离第一绝缘件3的一侧，第三绝缘件8设置于第二盖板2的远离第一绝缘件3的一侧。第一导电件5包括连接柱51和限位部52，限位部52设置于第二绝缘件7的远离第一盖板1的一侧，连接柱51连接于限位部52的靠近第二绝缘件7的一侧。第二导电件6设置于第三绝缘件8的远离第二盖板2的一侧。
第一盖板1设有第一通孔11，第二盖板2设有第二通孔21，第一绝缘件3设有第三通孔31，第二导电件6设有第四通孔61，第二绝缘件7设有第五通孔71，第三绝缘件8设有第六通孔81，第一密封件91设有第七通孔，第二密封件92设有第八通孔，连接柱51依次穿过第七通孔、第五通孔71、第一通孔11、第三通孔31、第二通孔21、第六通孔81、第八通孔和第四通孔61以与第二导电件6连接，限位部52用于限制第一导电件5沿第一通孔11的轴线方向运动。
第一盖板1、第二盖板2、第一绝缘件3、第一导电件5的限位部52、第二导电件6、第二绝缘件7和第三绝缘件8均为方形形状。
第一壳体20中的第一电极组件40和第二壳体30中的第二电极组件50通过第一导电件5和第二导电件6实现电连接。
第一密封件91设置于限位部52和第二绝缘件7之间，可以在轴向方向上使第一导电件5的限位部52和第二绝缘件7之间的紧密连接，在轴向方向上隔离第一导电件5的限位部52和第一盖板1，以及在径向方向上隔离第一盖板1和第一导电件5的连接柱51。第二密封件92设置于第二导电件6和第三绝缘件8之间，可以在轴向方向上使第二导电件6和第三绝缘件8之间的紧密连接，在轴向方向上隔离第二导电件6和第二盖板2，以及在径向方向上隔离第二盖板2和第一导电件5的连接柱51。
防转装置4包括防转部件41、第一凹槽42和第二凹槽43。
防转部件41包括第一凸起部411、第二凸起部412和连接于第一凸起部411和第二凸起部412之间的中间部413。第一凹槽42设置于第一盖板1上，且开口朝向第一绝缘件3。第二凹槽43设置于第二盖板2上，且开口朝向第一绝缘件3。
第一绝缘件3上设有安装孔44，防转部件41安装于安装孔44中，且第一凸起部411凸出于第一绝缘件3的靠近第一盖板1的表面，第二凸起部412凸出于第一绝缘件3的靠近第二盖板2的表面，第一凸起部411插入第一凹槽42中，第二凸起部412插入第二凹槽43中。
如图9所示，第三通孔31的两侧分别设有防转部件41，防转部件41的第一凸起部411和第二凸起部412分别从第一绝缘件3的两侧凸出。
如图10至图12所示，两个防转部件41均没有设置在第一绝缘件3的横向中线上。
如图13所示，第二凸起部412凸出于第一绝缘件3的高度为H。
如图14和图15所示，两个防转部件的中心和第三通孔31在同一条直线上，且该直线相对于第一绝缘件3的横向中线倾斜。
如图16和图17所示，连接柱51的直径为D1，连接柱51与右侧的第一凸起部411之间的距离为d，连接柱51与右侧的第一凸起部411之间在长度方向上的距离为L，连接柱51与右侧的第一凸起部411之间在宽度方向上的距离为W，第一凸起部411的直径为D2，第一绝缘件3上安装孔44的直径为D3。
在该实施例中，第一凸起部411的体积V与第一凸起部411凸出于第一绝缘件3的凸出高度H的比值为1.5～1300。防转部件41的直径D2与安装孔44的直径D3的比值为0.8～1。第一凸起部411与连接柱51之间的间隔距离d与连接柱51的直径为D1的比值为0.5～20。第一凸起部411的直径D2与连接柱51的直径为D1的比值为0.01～0.98。第一凸起部411的直径D2与第一凸起部411的凸出高度H的比值为0.1～10。第一凸起部 411的体积V与第一凸起部411的直径D2的比值为2～400。距离W与距离L的比值大于或等于0.01。
本申请提供的端盖组件实施例的抗扭转能力较高，能够有效防止第一绝缘件和第一盖板之间以及第一绝缘件和第二盖板之间发生相对转动，进而提高第一盖板和第二盖板之间的抗扭转能力，从而提升整个电池单体的抗扭转能力，避免电池单体发生漏液等危险事故，提高电池单体的安全性能。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (16)

  1. 一种端盖组件(10)，包括：
    第一盖板(1)，用于封闭第一壳体(20)；
    第二盖板(2)，用于封闭第二壳体(30)，所述第二盖板(2)与所述第一盖板(1)沿第一方向相对设置；
    第一绝缘件(3)，设置于所述第一盖板(1)和所述第二盖板(2)之间；和
    防转装置(4)，设置于所述第一绝缘件(3)和所述第一盖板(1)之间以及所述第一绝缘件(3)和所述第二盖板(2)之间，以防止所述第一绝缘件(3)和所述第一盖板(1)之间相对转动以及所述第一绝缘件(3)和所述第二盖板(2)之间相对转动。
  2. 根据权利要求1所述的端盖组件(10)，其中，所述防转装置(4)包括防转部件(41)、设置于所述第一盖板(1)的第一凹槽(42)、设置于所述第二盖板(2)的第二凹槽(43)，所述防转部件(41)设置于所述第一绝缘件(3)上，且所述防转部件(41)包括凸出于所述第一绝缘件(3)并至少部分插入所述第一凹槽(42)的第一凸起部(411)以及凸出于所述第一绝缘件(3)并至少部分插入所述第二凹槽(43)的第二凸起部(412)。
  3. 根据权利要求2所述的端盖组件(10)，其中，所述第一凸起部(411)和所述第一绝缘件(3)一体成型；和/或，所述第二凸起部(412)和所述第一绝缘件(3)一体成型。
  4. 根据权利要求2所述的端盖组件(10)，其中，所述第一绝缘件(3)上开设有安装孔(44)，所述防转部件(41)还包括插设于所述安装孔(44)中的中间部(413)，所述第一凸起部(411)、第二凸起部 (412)及所述中间部(413)一体成型。
  5. 根据权利要求4所述的端盖组件(10)，其中，所述防转部件(41)呈圆柱体形状，所述防转部件(41)的直径D2与所述安装孔(44)的直径D3的比值为0.8～1。
  6. 根据权利要求2至5任一项所述的端盖组件(10)，其中，所述第一凸起部(411)的体积V与所述第一凸起部(411)凸出于所述第一绝缘件(3)的凸出高度H的比值为1.5～1300。
  7. 根据权利要求2至6任一项所述的端盖组件(10)，还包括连接柱(51)，所述第一盖板(1)设有第一通孔(11)，所述第二盖板(2)设有第二通孔(21)，所述第一绝缘件(3)设有第三通孔(31)，所述连接柱(51)依次穿过所述第一通孔(11)、所述第三通孔(31)和所述第二通孔(21)，以用于电连接设置于所述第一壳体(20)内的第一电极组件(40)和设置于所述第二壳体(30)内的第二电极组件(50)。
  8. 根据权利要求7所述的端盖组件(10)，其中，所述连接柱(51)呈圆柱体形状，所述第一凸起部(411)及所述第二凸起部(412)两者中的至少一者与所述连接柱(51)之间的间隔距离为d，所述连接柱(51)的直径为D1；其中，d与D1的比值为0.5～20。
  9. 根据权利要求2至8任一项所述的端盖组件(10)，其中，所述第一凸起部(411)和所述第二凸起部(412)呈圆柱体形状。
  10. 根据权利要求9所述的端盖组件(10)，其中，所述连接柱(51)呈圆柱体形状，所述第一凸起部(411)及所述第二凸起部(412)两者中的至少一者的直径为D2，所述连接柱(51)的直径为D1；其中，D2与D1比值为0.01～0.98。
  11. 根据权利要求9或10所述的端盖组件(10)，其中，所述第一凸起部(411)的直径D2与所述第一凸起部(411)的凸出高度H的比值为 0.1～10。
  12. 根据权利要求9至11中任一项所述的端盖组件(10)，其中，所述第一凸起部(411)的体积V与所述第一凸起部(411)的直径D2的比值为2～400。
  13. 根据权利要求7至12任一项所述的端盖组件(10)，其中，所述第一绝缘件(3)呈方形结构，在所述第一绝缘件(3)的长度方向上，所述防转部件(41)和所述连接柱(51)的间隔距离为L；在所述第一绝缘件(3)的宽度方向上，所述防转部件(41)和所述连接柱(51)的间隔距离为W；其中，W与L的比值大于或等于0.01。
  14. 一种电池单体(101)，包括如权利要求1至13任一项所述的端盖组件(10)。
  15. 一种电池(100)，包括箱体本体(102)和如权利要求14所述的电池单体(101)，所述电池单体(101)设置于所述箱体本体(102)中，所述电池单体(101)用以提供电能。
  16. 一种用电装置，包括如权利要求14所述的电池单体(101)，所述电池单体(101)用于向所述用电装置供应电能；或者，包括如权利要求15所述的电池(100)，所述电池(100)用于向所述用电装置供应电能。
PCT/CN2022/117825 2022-09-08 2022-09-08 端盖组件、电池单体、电池和用电装置 WO2024050757A1 (zh)

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Publication number Priority date Publication date Assignee Title
JP2005123069A (ja) * 2003-10-17 2005-05-12 Sanyo Electric Co Ltd 組電池
JP2006324061A (ja) * 2005-05-17 2006-11-30 Ykk Corp 端子間接続部のカバー装置及びそれを用いた端子間接続装置
US20080182160A1 (en) * 2007-01-25 2008-07-31 Kim Tae-Yong Serial interface between unit cells
WO2021001546A1 (de) * 2019-07-04 2021-01-07 F.E.R. Fischer Edelstahlrohre Gmbh Zellverbinder für zellen und zellmodule und batteriemodule mit zellen
CN114824589A (zh) * 2022-05-07 2022-07-29 深圳市科达利实业股份有限公司 一种电池盖板及电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005123069A (ja) * 2003-10-17 2005-05-12 Sanyo Electric Co Ltd 組電池
JP2006324061A (ja) * 2005-05-17 2006-11-30 Ykk Corp 端子間接続部のカバー装置及びそれを用いた端子間接続装置
US20080182160A1 (en) * 2007-01-25 2008-07-31 Kim Tae-Yong Serial interface between unit cells
WO2021001546A1 (de) * 2019-07-04 2021-01-07 F.E.R. Fischer Edelstahlrohre Gmbh Zellverbinder für zellen und zellmodule und batteriemodule mit zellen
CN114824589A (zh) * 2022-05-07 2022-07-29 深圳市科达利实业股份有限公司 一种电池盖板及电池

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