WO2024065457A1 - 端盖、电池单体、电池及用电设备 - Google Patents

端盖、电池单体、电池及用电设备 Download PDF

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Publication number
WO2024065457A1
WO2024065457A1 PCT/CN2022/122809 CN2022122809W WO2024065457A1 WO 2024065457 A1 WO2024065457 A1 WO 2024065457A1 CN 2022122809 W CN2022122809 W CN 2022122809W WO 2024065457 A1 WO2024065457 A1 WO 2024065457A1
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WO
WIPO (PCT)
Prior art keywords
arc
arc segment
cover body
along
end cap
Prior art date
Application number
PCT/CN2022/122809
Other languages
English (en)
French (fr)
Inventor
陈圣旺
范雪锋
郭志君
王鹏
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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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/CN2022/122809 priority Critical patent/WO2024065457A1/zh
Publication of WO2024065457A1 publication Critical patent/WO2024065457A1/zh

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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/148Lids or covers characterised by their shape
    • H01M50/152Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30Arrangements for facilitating escape of gases
    • H01M50/342Non-re-sealable arrangements
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Definitions

  • the present application relates to the field of battery technology, and in particular to an end cover, a battery cell, a battery and an electrical device.
  • Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.
  • the embodiments of the present application provide an end cover, a battery cell, a battery and an electrical device, which can effectively increase the service life of the battery cell.
  • an embodiment of the present application provides an end cover for a battery cell, comprising a cover body and a reinforcement portion; the cover body is used to close the opening of the shell of the battery cell, and the cover body has a first surface along the thickness direction of the cover body; the reinforcement portion protrudes from the first surface, and the reinforcement portion is used to strengthen the cover body.
  • a reinforcing portion is provided on the first surface of the cover body in the thickness direction, which strengthens the cover body, improves the deformation resistance of the end cover, improves the fatigue resistance of the end cover, reduces the risk of the end cover being damaged due to fatigue, and makes the end cover have a longer service life, thereby improving the service life of the battery cell.
  • the reinforcement portion includes a first arc portion and a second arc portion protruding from the first surface, and the opening of the first arc portion is arranged opposite to the opening of the second arc portion.
  • the first arc portion and the second arc portion are both arc-shaped, and the openings of the two are arranged opposite to each other.
  • the reinforcement portion of this structure has a larger radiation range, which can increase the reinforcement range of the cover body.
  • the arc-shaped first arc portion and the second arc portion themselves have better anti-deformation ability, and are not easy to deform when subjected to a force in the thickness direction, which can play a better reinforcement effect on the cover body, and further improve the anti-deformation ability and anti-fatigue performance of the end cover.
  • the first arc portion is connected to the second arc portion to form a connection area
  • the connection area has a first end and a second end opposite to each other
  • the first arc portion includes a first arc segment and a second arc segment
  • the second arc portion includes a third arc segment and a fourth arc segment
  • the first arc segment and the third arc segment are connected to the first end
  • the second arc segment and the fourth arc segment are connected to the second end; along the direction from the second end to the first end, the spacing between the first arc segment and the third arc segment gradually increases; along the direction from the first end to the second end, the spacing between the second arc segment and the fourth arc segment gradually increases.
  • the first arc portion is connected to the second arc portion to form a connection area, and the connection area can play a good role in strengthening the cover body.
  • the spacing between the first arc segment and the third arc segment gradually increases, so that the strengthening range of the first arc segment and the third arc segment gradually increases, and the arc-shaped first arc segment and the third arc segment themselves have good anti-deformation ability, which further improves the strengthening effect of the reinforcing portion on the cover body.
  • the distance between the second arc segment and the fourth arc segment gradually increases, so that the reinforcement range of the second arc segment and the fourth arc segment gradually increases, and the arc-shaped second arc segment and the fourth arc segment themselves have good anti-deformation ability, which further improves the reinforcement effect of the reinforcement part on the cover body.
  • the width of the connection area gradually increases from the middle position of the connection area to the first end and the second end. In this way, the strengthening ability of the connection area from the middle position to the two ends is gradually enhanced, and the connection area itself has a good anti-deformation ability, which enhances the strengthening effect of the connection area on the cover body.
  • the width of the connection area gradually increases from the middle position to the two ends, and the distance between the first arc segment and the third arc segment gradually increases along the direction from the second end to the first end, and the distance between the second arc segment and the fourth arc segment gradually increases along the direction from the first end to the second end, the width of the reinforcement part gradually increases from the middle to the two ends, and the reinforcement part has a better strengthening effect on the cover body.
  • the cover body is circular, and the center line of the cover body passes through the middle position.
  • the central area of the cover body is most likely to deform, and the central axis of the cover body passes through the middle position of the connection area, so that the reinforcement part can strengthen the central area of the cover body, thereby reducing the risk of the end cover being damaged due to fatigue.
  • the first arc segment has a first side surface facing the third arc segment
  • the third arc segment has a third side surface facing the first arc segment
  • the first side surface and the third side surface are connected by a first fillet surface
  • the second arc segment has a second side surface facing the fourth arc segment
  • the fourth arc segment has a fourth side surface facing the second arc segment
  • the second side surface and the fourth side surface are connected by a second fillet surface.
  • the first side surface and the third side surface are connected by the first fillet surface, reducing the risk of stress concentration at the connection position of the first arc segment and the third arc segment; the second side surface and the fourth side surface are connected by the second fillet surface, reducing the risk of stress concentration at the connection position of the second arc segment and the fourth arc segment.
  • the first arc segment is symmetrically arranged with the third arc segment; and/or, the second arc segment is symmetrically arranged with the fourth arc segment; and/or, the first arc segment is symmetrically arranged with the second arc segment; and/or, the third arc segment is symmetrically arranged with the fourth arc segment.
  • the first arc segment and the third arc segment are symmetrically arranged, and when the cover body is subjected to a force, the first arc segment and the third arc segment are subjected to substantially the same force, and the first arc segment and the third arc segment have substantially the same ability to resist deformation of the cover body, and both the first arc segment and the third arc segment can play a good role in strengthening the cover body.
  • the second arc segment and the fourth arc segment are symmetrically arranged, and when the cover body is subjected to a force, the second arc segment and the fourth arc segment are subjected to substantially the same force, and the second arc segment and the fourth arc segment have substantially the same ability to resist deformation of the cover body, and both the second arc segment and the fourth arc segment can play a good role in strengthening the cover body.
  • the first arc segment and the second arc segment are symmetrically arranged. When the cover body is subjected to an action force, the first arc segment and the second arc segment are subjected to substantially the same force. The first arc segment and the second arc segment have substantially the same ability to resist deformation of the cover body.
  • the first arc segment and the second arc segment can both play a good role in strengthening the cover body.
  • the third arc segment and the fourth arc segment are symmetrically arranged. When the cover body is subjected to an action force, the third arc segment and the fourth arc segment are subjected to substantially the same force.
  • the third arc segment and the fourth arc segment have substantially the same ability to resist deformation of the cover body.
  • the third arc segment and the fourth arc segment can both play a good role in strengthening the cover body.
  • the center angle of the first arc portion is ⁇ 1 , satisfying: ⁇ 1 >90°; and/or the center angle of the second arc portion is ⁇ 2 , satisfying: ⁇ 2 >90°.
  • ⁇ 1 >90° increases the reinforcement range of the first arc portion on the cover body;
  • ⁇ 2 >90° increases the reinforcement range of the second arc portion on the cover body.
  • the reinforcement part is integrally formed with the cover body, so that the connection strength between the reinforcement part and the cover body can be enhanced, and the long-term reliability of the end cover can be improved.
  • the cover body has a second surface opposite to the first surface, and the cover body is provided with a first recessed portion, which is recessed from the second surface in a direction close to the first surface, and a reinforcing portion protruding from the first surface is formed at a position of the cover body corresponding to the first recessed portion.
  • the first recessed portion can be formed on the second surface by stamping, thereby forming a reinforcing portion protruding from the first surface, and the molding method of the reinforcing portion is simple.
  • the provision of the first recessed portion enables the cover body to form a recessed structure at the position where the reinforcing portion is provided, so that the reinforcing portion has better anti-deformation ability, and improves the reinforcing effect of the reinforcing portion on the cover body.
  • the height of the reinforcing portion protruding from the first surface is H
  • the distance between the first surface and the second surface is D, which satisfies: 0.04mm 2 ⁇ D*H ⁇ 0.81mm 2 .
  • D*H ⁇ 0.04mm 2 the thickness of at least one of D and H is too small, the deformation resistance of the end cap is poor, and the end cap is prone to deformation.
  • D*H>0.81mm 2 the thickness of at least one of D and H is too large, and the end cap occupies a large space. Therefore, 0.04mm 2 ⁇ D*H ⁇ 0.81mm 2 can, on the one hand, improve the deformation resistance of the end cap, and on the other hand, can prevent the end cap from occupying a large space.
  • 0.06mm 2 ⁇ D*H ⁇ 0.64mm 2 0.06mm 2 ⁇ D*H ⁇ 0.64mm 2 .
  • the deformation resistance of the end cap can be further improved, and on the other hand, the space occupied by the end cap can be further reduced.
  • D*H>0.64mm 2 when the reinforcement part is formed by stamping, the stretching amount of the reinforcement part is too large, resulting in the weakening of the strength of the reinforcement part. Therefore, D*H ⁇ 0.64mm 2 can improve the strength of the reinforcement part.
  • 0.25mm ⁇ H ⁇ 0.8mm; and/or, 0.25mm ⁇ D ⁇ 0.8mm 0.25mm ⁇ H ⁇ 0.8mm; and/or, 0.25mm ⁇ D ⁇ 0.8mm.
  • H ⁇ 0.25mm the height of the reinforcement protruding from the first surface is small, and the reinforcement effect of the reinforcement on the cover body is small.
  • H>0.8mm the height of the reinforcement protruding from the first surface is large, and the reinforcement occupies a large space. Therefore, 0.25mm ⁇ H ⁇ 0.8mm, on the one hand, can improve the reinforcement effect of the reinforcement on the cover body, and on the other hand, can reduce the space occupied by the reinforcement.
  • D ⁇ 0.25mm the distance between the first surface and the second surface is small, the deformation resistance of the cover body is poor, and the strength of the cover body is also poor.
  • the reinforcement portion has a side wall and a bottom wall, the side wall is arranged around the bottom wall, the side wall and the bottom wall jointly define a first recess, the maximum thickness of the side wall is L 1 , and the maximum thickness of the bottom wall is L 2 ; along the thickness direction, the distance between the first surface and the second surface is D, satisfying: L 1 ⁇ D, L 2 ⁇ D.
  • L 1 and L 2 are both not greater than D, so that the maximum thickness of the side wall and the maximum thickness of the bottom wall will not exceed the distance between the first surface and the second surface, which can simplify the molding process, and the reinforcement portion can be formed by stamping, and the molding method is simple.
  • the minimum thickness of the bottom wall is L 3
  • the minimum thickness of the side wall is L 4 , satisfying: DL 3 ⁇ 0.2 mm; and/or, DL 4 ⁇ 0.2 mm. If DL 3 > 0.2 mm, the minimum thickness of the bottom wall is small, and the strength of the bottom wall is poor, and the bottom wall is easily damaged. Therefore, DL 3 ⁇ 0.2 mm can ensure that the bottom wall has sufficient strength; if DL 4 > 0.2 mm, the minimum thickness of the side wall is small, and the strength of the side wall is poor, and the side wall is easily damaged. Therefore, DL 4 ⁇ 0.2 mm can ensure that the side wall has sufficient strength.
  • the cover body has a pressure relief zone
  • the first surface is at least partially located in the pressure relief zone
  • the cover body is provided with a notch groove
  • the notch groove is provided along the edge of the pressure relief zone
  • the pressure relief zone is configured to open with the notch groove as the boundary when the battery cell is depressurized; wherein the reinforcement portion is provided in the pressure relief zone.
  • the reinforcement portion is provided in the pressure relief zone, and the reinforcement portion strengthens the pressure relief zone, improves the deformation resistance of the pressure relief zone, and when the internal pressure of the battery cell changes, the pressure relief zone is not easily deformed, thereby reducing the risk of the pressure relief zone opening during normal use of the battery cell.
  • the notched groove is a groove extending along a closed track.
  • the pressure relief area can be opened in a manner of being detached from the outside of the battery cell, so that the battery cell has a larger pressure relief area and the pressure relief efficiency is improved.
  • the notched groove is in a circular shape.
  • the notched groove in a circular shape has a simple structure and is easy to form.
  • the cover body is circular, and the notched groove is coaxially arranged with the cover body. In this way, the pressure relief area defined by the notched groove is located in the central area of the cover body, which is conducive to the timely opening of the pressure relief area for pressure relief.
  • the first surface faces the interior of the shell, and the notch groove is disposed on the first surface. Since the notch groove is disposed on the first surface and the first surface faces the interior of the shell, the notch groove faces the interior of the battery cell, and the notch groove is not exposed to the exterior of the battery cell, thereby reducing the risk of oxidation of the position where the notch groove is disposed on the cover body due to exposure to the exterior of the battery cell. Since the reinforcement portion is disposed on the first surface and the first surface faces the interior of the shell, the reinforcement portion can utilize the interior space of the battery cell, and the reinforcement portion does not occupy the exterior space of the battery cell.
  • the reinforcing portion includes a first arc portion and a second arc portion protruding from the first surface, and the opening of the first arc portion is arranged opposite to the opening of the second arc portion;
  • the minimum spacing between the end of the first arc portion in the extension direction and the notched groove is S 1 , satisfying: S 1 > 0.5 mm; and/or, the minimum spacing between the end of the second arc portion in the extension direction and the notched groove is S 2 , satisfying: S 2 > 0.5 mm.
  • S 1 > 0.5 mm reduces the influence of the first arc portion on the notched groove, and reduces the risk of squeezing the notched groove due to the end of the first arc portion being too close to the notched groove.
  • S 2 > 0.5 mm reduces the influence of the second arc portion on the notched groove, and reduces the risk of squeezing the notched groove due to the end of the second arc portion being too close to the notched groove.
  • the cover body includes a main body portion and a connecting portion
  • the main body portion has a first surface
  • the connecting portion is disposed around the outer edge of the main body portion, and in the thickness direction
  • the connecting portion protrudes from the main body portion in a direction facing the interior of the shell, and the connecting portion is used to extend into the shell and form a positioning fit with the shell.
  • the connecting portion protrudes from the main body portion in a direction facing the interior of the shell, and the connecting portion can form a positioning fit with the shell, which can improve the assembly efficiency of the end cover and the shell.
  • connection portion along the thickness direction, has a third surface facing the interior of the shell, the first surface faces the interior of the shell, and the reinforcing portion does not extend beyond the third surface along the direction facing the interior of the shell. In this way, when the third surface of the connection portion abuts against the internal components of the battery cell, the reinforcing portion is not likely to interfere with the internal components of the battery cell.
  • the main body has a fourth surface and a fifth surface relative to each other, and the connecting portion protrudes from the fourth surface;
  • the main body has a pressure relief zone, and the main body is provided with a notched groove and a second recessed portion, the notched groove is provided along the edge of the pressure relief zone, and the pressure relief zone is configured to open with the notched groove as a boundary when the battery cell is depressurized, and the second recessed portion is recessed from the fifth surface in a direction close to the fourth surface; wherein the projection of the bottom surface of the second recess in the thickness direction covers the notched groove.
  • the provision of the second recess allows a certain distance between the pressure relief zone and the fifth surface, and when the fifth surface contacts with external components, the influence of the external components on the pressure relief zone can be reduced, so that the pressure relief zone can be opened outward when the battery cell is depressurized, and the risk of the pressure relief zone being blocked by external components and failing to open normally is reduced.
  • the fifth surface is the surface of the end cap farthest from the housing.
  • the fifth surface can be used as a supporting surface for the battery cell. When the battery cell is placed on an external component, the fifth surface contacts the external component to ensure the stability of the battery cell placed on the external component.
  • the position of the body corresponding to the second recess forms a convex portion protruding from the fourth surface, and the surface of the convex portion away from the fourth surface is the first surface.
  • the provision of the convex portion can increase the strength of the area of the body where the second recess is provided.
  • the bottom surface of the second recess is arranged opposite to the first surface; the main body is provided with a first recess, which is recessed from the bottom surface of the second recess in a direction close to the first surface, and a reinforcement portion protruding from the first surface is formed at a position of the main body corresponding to the first recess.
  • the first recess can be formed on the bottom surface of the second recess by stamping, thereby forming a reinforcement portion protruding from the first surface, and the molding method of the reinforcement portion is simple.
  • the provision of the first recess allows the main body to form a recessed structure at the position where the reinforcement portion is provided, so that the reinforcement portion has better anti-deformation ability, and improves the reinforcement effect of the reinforcement portion on the main body.
  • the cover body further includes an edge portion, which is disposed around the outer edge of the connecting portion, and the edge portion is used to connect to one end of the shell having an opening.
  • the edge portion can abut against one end of the shell having an opening, and the edge portion can be conveniently connected to the one end of the shell having an opening, for example, by welding the edge portion to the one end of the shell having an opening.
  • the material of the end cap includes at least one of steel, stainless steel and nickel-plated steel. Such an end cap has better strength and rigidity and longer service life.
  • an embodiment of the present application provides a battery cell, comprising a shell and an end cover provided by any one of the embodiments of the first aspect above; the shell has an opening; and the cover body closes the opening.
  • the first surface faces the interior of the housing.
  • an embodiment of the present application provides a battery, comprising a battery cell provided by any one of the embodiments of the second aspect above.
  • an embodiment of the present application provides an electrical device, comprising a battery provided by any one of the embodiments of the third aspect above.
  • FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
  • FIG2 is an exploded view of a battery provided in some embodiments of the present application.
  • FIG3 is an exploded view of a battery cell provided in some embodiments of the present application.
  • FIG4 is a cross-sectional view of the battery cell shown in FIG3 ;
  • FIG5 is an axonometric view of the end cover shown in FIG4;
  • FIG6 is a top view of the end cover shown in FIG5;
  • FIG7 is a schematic structural diagram of the reinforcement portion shown in FIG6 ;
  • Fig. 8 is a cross-sectional view of the end cover taken along line A-A shown in Fig. 6;
  • FIG9 is a bottom view of the end cover shown in FIG8;
  • FIG10 is a partial enlarged view of the B portion of the end cover shown in FIG8;
  • FIG. 11 is a partial enlarged view of a portion C of the battery cell shown in FIG. 4 .
  • Icons 1-shell; 11-wall; 2-electrode assembly; 21-first pole ear; 22-second pole ear; 3-end cover; 31-cap body; 311-first surface; 312-second surface; 313-first recess; 314-pressure relief area; 315-notched groove; 316-body; 3161-fourth surface; 3162-fifth surface; 3163-second recess; 3164-convex portion; 317-connecting portion; 3171-third surface; 318-edge portion; 3181-step surface; 32-reinforcement portion; 321-first arc portion; 3210-first arc surface; 3211-first arc segment; 3211a-first side surface; 3212-second arc segment; 3212a-second side surface; 322-second arc portion; 3220-second arc surface; 3221-third arc segment; 3221a-third side surface; 3222-fourth arc segment; 3222a-fourth side surface; 323-connecting area; 3231-first end; 3232-
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
  • battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in the present application may include a battery module or a battery pack.
  • the battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator.
  • the battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode collector.
  • the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer.
  • the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.
  • the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide.
  • the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer.
  • the negative electrode active material layer is coated on the surface of the negative electrode collector.
  • the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer.
  • the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode ear.
  • the material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon.
  • the number of positive pole ears is multiple and stacked together, and the number of negative pole ears is multiple and stacked together.
  • the material of the isolation film can be PP (polypropylene) or PE (polyethylene).
  • the electrode assembly can be a winding structure or a laminated structure, and the embodiments of the present application are not limited thereto.
  • gas may be generated inside the battery cell, causing the internal pressure of the battery cell to change and causing the end cover of the battery cell to deform. Over time, the end cover is easily damaged due to fatigue, affecting the service life of the battery cell.
  • an embodiment of the present application provides an end cover, wherein a reinforcing portion is provided on a first surface of a cover body in a thickness direction, and the cover body is reinforced by the reinforcing portion.
  • the reinforcement part strengthens the cover body, improves the deformation resistance of the end cover, improves the fatigue resistance of the end cover, reduces the risk of the end cover being damaged due to fatigue, makes the end cover have a longer service life, and thus improves the service life of the battery cell.
  • Electrical equipment may be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools, etc.
  • Vehicles may be fuel vehicles, gas vehicles, or new energy vehicles, and new energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc.
  • spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.
  • electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.
  • the embodiments of the present application do not impose any special restrictions on the above-mentioned electrical equipment.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application.
  • a battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000.
  • the battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
  • FIG. 2 is an exploded view of a battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a battery cell 10 and a box 20 .
  • the box 20 is used to accommodate the battery cell 10 .
  • the box body 20 is a component for accommodating the battery cell 10, and the box body 20 provides a storage space for the battery cell 10.
  • the box body 20 can adopt a variety of structures.
  • the box body 20 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other to define a storage space for accommodating the battery cell 10.
  • the first part 201 and the second part 202 may be in a variety of shapes, such as a cuboid, a cylinder, etc.
  • the first part 201 may be a hollow structure with one side open
  • the second part 202 may also be a hollow structure with one side open
  • the open side of the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space.
  • the first part 201 is a hollow structure with one side open
  • the second part 202 is a plate-like structure
  • the second part 202 covers the open side of the first part 201, so as to form a box body 20 with a storage space.
  • the first part 201 and the second part 202 may be sealed by a sealing element, and the sealing element may be a sealing ring, a sealant, etc.
  • the battery 100 there may be one or more battery cells 10. If there are more than one battery cell 10, the battery cells 10 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the battery cells 10 are both connected in series and in parallel.
  • a battery module may be formed by connecting a plurality of battery cells 10 in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole and accommodated in the box 20.
  • all the battery cells 10 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 10 is accommodated in the box 20.
  • Figure 3 is an exploded view of a battery cell 10 provided in some embodiments of the present application
  • Figure 4 is a cross-sectional view of the battery cell 10 shown in Figure 3.
  • the battery cell 10 may include a housing 1, an electrode assembly 2 and an end cap 3.
  • the shell 1 is a component for accommodating the electrode assembly 2.
  • the shell 1 may be a hollow structure with an opening formed at one end.
  • the shell 1 may be in various shapes, such as a cylinder, a cuboid, etc.
  • the shell 1 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the electrode assembly 2 is a component in the battery cell 10 where an electrochemical reaction occurs.
  • the electrode assembly 2 may include a positive electrode sheet, a negative electrode sheet, and a separator.
  • the electrode assembly 2 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or a laminated structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.
  • the electrode assembly 2 has a first pole ear 21 and a second pole ear 22, one of which is a positive pole ear and the other is a negative pole ear.
  • the positive pole ear may be a portion of the positive electrode sheet that is not coated with a positive electrode active material layer
  • the negative pole ear may be a portion of the negative electrode sheet that is not coated with a negative electrode active material layer.
  • the end cap 3 is a component that closes the opening of the shell 1 to isolate the internal environment of the battery cell 10 from the external environment.
  • the end cap 3 and the shell 1 together define a sealed space for accommodating the electrode assembly 2, the electrolyte and other components.
  • the shape of the end cap 3 can be adapted to the shape of the shell 1.
  • the shell 1 is a rectangular parallelepiped structure
  • the end cap 3 is a rectangular structure adapted to the shell 1.
  • the shell 1 is a cylindrical structure
  • the end cap 3 is a circular structure adapted to the shell 1.
  • the material of the end cap 3 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • the material of the end cap 3 can be the same as or different from the material of the shell 1.
  • the battery cell 10 may further include an electrode terminal 4, which is used to be electrically connected to the electrode assembly 2 to output the electrical energy of the battery cell 10.
  • the electrode terminal 4 may be mounted on the housing 1 or on the end cap 3. In the embodiments shown in FIGS. 3 and 4 , the electrode terminal 4 is disposed on the wall 11 of the housing 1 opposite to the end cap 3, the end cap 3 is electrically connected to the first pole tab 21, and the electrode terminal 4 is electrically connected to the second pole tab 22.
  • the end cap 3 and the first pole tab 21 can be directly connected or indirectly connected, and the electrode terminal 4 and the second pole tab 22 can be directly connected or indirectly connected.
  • the end cap 3 and the first pole tab 21 are indirectly connected through a current collecting member 5, and the electrode terminal 4 and the second pole tab 22 are indirectly connected through another current collecting member 5.
  • the current collecting member 5 is a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the current collecting member 5 can be disc-shaped.
  • Figure 5 is an isometric view of the end cover 3 shown in Figure 4;
  • Figure 6 is a top view of the end cover 3 shown in Figure 5.
  • the embodiment of the present application provides an end cover 3 for a battery cell 10, comprising a cover body 31 and a reinforcement portion 32.
  • the cover body 31 is used to close the opening of the shell 1 of the battery cell 10.
  • the cover body 31 has a first surface 311.
  • the reinforcement portion 32 protrudes from the first surface 311, and the reinforcement portion 32 is used to strengthen the cover body 31.
  • the cover body 31 is the main part of the end cover 3, and the cover body 31 can close the opening of the shell 1.
  • the shape of the cover body 31 can be various, such as round, rectangular, etc.
  • the first surface 311 can be the surface of the cover body 31 facing the shell 1 along the thickness direction Z, or the surface of the cover body 31 away from the shell 1 along the thickness direction Z.
  • the first surface 311 can be the surface of the cover body 31 closest to the shell 1 along the thickness direction Z, or the surface of the cover body 31 farthest from the shell 1 along the thickness direction Z, or the surface of the cover body 31 located between the surface of the cover body 31 closest to the shell 1 and the surface farthest from the shell 1 along the thickness direction Z.
  • the cover body 31 has a relative inner surface and outer surface in the thickness direction Z, the inner surface faces the shell 1 along the thickness direction Z, and the first surface 311 can be the inner surface of the cover body 31 or the outer surface.
  • the reinforcement part 32 is a part of the end cover 3 that protrudes from the first surface 311 and plays a role in reinforcing the cover body 31.
  • the reinforcement part 32 can improve the rigidity of the cover body 31 and enhance the anti-deformation ability of the cover body 31, thereby improving the anti-deformation ability of the entire end cover 3.
  • the reinforcement part 32 can be in a variety of shapes, such as a straight line, an arc, a circular ring, a U-shape, a circle, a rectangle, etc.
  • the reinforcement part 32 and the cover body 31 can be integrally formed, for example, the reinforcement part 32 is formed on the end cover 3 by stamping, so that the reinforcement part 32 and the cover body 31 are integrally formed; the reinforcement part 32 and the cover body 31 can also be separately provided and connected, such as by welding.
  • a reinforcing portion 32 is provided on the first surface 311 of the cover body 31 in the thickness direction Z.
  • the reinforcing portion 32 reinforces the cover body 31, improves the deformation resistance of the end cover 3, improves the fatigue resistance of the end cover 3, reduces the risk of the end cover 3 being damaged due to fatigue, and makes the end cover 3 have a longer service life, thereby improving the service life of the battery cell 10.
  • the battery cell 10 can be fixed to an external component by an adhesive layer, and the adhesive layer connects the external component and the end cap 3.
  • the external component may be the bottom wall 327 of the housing 20, a thermal management component, etc.
  • the thermal management component is a component that manages the temperature of the battery cell 10 in the housing 20, and the thermal management component may be a water cooling plate.
  • the battery cell 10 may expand, causing the end cap 3 to deform. After the end cap 3 is deformed, the end cap 3 may be separated from the adhesive layer.
  • the provision of the reinforcement portion 32 improves the deformation resistance of the end cap 3 and reduces the risk of the end cap 3 being separated from the adhesive layer.
  • the reinforcement portion 32 includes a first arc portion 321 and a second arc portion 322 protruding from the first surface 311 , and an opening of the first arc portion 321 and an opening of the second arc portion 322 are arranged back to back.
  • the first arc portion 321 and the second arc portion 322 are both arc-shaped, and both protrude from the first surface 311.
  • the center angle of the first arc portion 321 can be any angle less than 360°, such as an acute angle, a right angle, an obtuse angle, etc.
  • the center angle of the second arc portion 322 can be any angle less than 360°, such as an acute angle, a right angle, an obtuse angle, etc.
  • the first arc portion 321 has two ends in the extension direction, and the connection line (straight line) position of the two ends of the first arc portion 321 forms the opening of the first arc portion 321.
  • the second arc portion 322 has two opposite ends in the extension direction, and the connection line (straight line) position of the two ends of the second arc portion 322 forms the opening of the second arc portion 322.
  • the first arc portion 321 has a first arc surface 3210 that is away from the second arc portion 322, and the first arc surface 3210 extends to both ends of the first arc portion 321;
  • the second arc portion 322 has a second arc surface 3220 that is away from the first arc portion 321, and the second arc surface 3220 extends to both ends of the second arc portion 322.
  • the opening of the first arc portion 321 and the opening of the second arc portion 322 are arranged back to back, that is, the first arc surface 3210 and the second arc surface 3220 are arranged back to back.
  • the first arc portion 321 and the second arc portion 322 may be directly connected; the first arc portion 321 and the second arc portion 322 may also be spaced apart, for example, the first arc portion 321 and the second arc portion 322 are spaced apart along the radial direction of the cover body 31 .
  • the first arc portion 321 and the second arc portion 322 are both arc-shaped, and the openings of the two are arranged back to back.
  • the reinforcement portion 32 of this structure has a larger radiation range, which can increase the reinforcement range of the cover body 31.
  • the arc-shaped first arc portion 321 and the second arc portion 322 themselves have better anti-deformation ability and are not easy to deform when subjected to force along the thickness direction Z. They can have a better reinforcement effect on the cover body 31, and further improve the anti-deformation ability and anti-fatigue performance of the end cover 3.
  • FIG. 7 is a schematic diagram of the structure of the reinforcing portion 32 shown in FIG. 6.
  • the first arc portion 321 is connected to the second arc portion 322 to form a connecting area 323, and the connecting area 323 has a first end 3231 and a second end 3232 opposite to each other.
  • the first arc portion 321 includes a first arc segment 3211 and a second arc segment 3212
  • the second arc portion 322 includes a third arc segment 3221 and a fourth arc segment 3222.
  • the first arc segment 3211 and the third arc segment 3221 are connected to the first end 3231
  • the second arc segment 3212 and the fourth arc segment 3222 are connected to the second end 3232.
  • the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases.
  • the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases.
  • connection area 323 is a common part of the first arc portion 321 and the second arc portion 322.
  • first end 3231 and the second end 3232 may be two opposite ends of the connection area 323 along the radial direction of the cover body 31.
  • the first arc segment 3211 and the second arc segment 3212 are arc portions of the first arc portion 321 located at the first end 3231 and the second end 3232 of the connection area 323, respectively.
  • the arc length of the first arc segment 3211 and the arc length of the second arc segment 3212 may be equal or unequal.
  • a portion of the first arc surface 3210 of the first arc portion 321 is located at the first arc portion 321, another portion is located at the second arc portion 322, and the remaining portion is located at the connection area 323.
  • the third arc segment 3221 and the fourth arc segment 3222 are arc portions of the second arc portion 322 located at the first end 3231 and the second end 3232 of the connection area 323, respectively.
  • the arc length of the third arc segment 3221 and the arc length of the fourth arc segment 3222 may be equal or different.
  • a portion of the second arc surface 3220 of the second arc portion 322 is located at the third arc portion, another portion is located at the fourth arc portion, and the remaining portion is located at the connection area 323.
  • the arc length of the first arc segment 3211 is equal to the arc length of the second arc portion 322, and the arc length of the third arc segment 3221 is equal to the arc length of the fourth arc segment 3222.
  • the first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221, and the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211.
  • the distance between the first arc segment 3211 and the third arc segment 3221 refers to the distance between the first side surface 3211a and the third side surface 3221a in the first direction X.
  • the second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222, and the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212.
  • the distance between the second arc segment 3212 and the fourth arc segment 3222 refers to the distance between the second side surface 3212a and the fourth side surface 3222a in the first direction X.
  • the first direction X is perpendicular to the direction from the first end 3231 to the second end 3232.
  • the first arc portion 321 is connected to the second arc portion 322 to form a connection area 323, and the connection area 323 can play a good role in reinforcing the cover body 31.
  • the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases, so that the reinforcement range of the first arc segment 3211 and the third arc segment 3221 gradually increases, and the arc-shaped first arc segment 3211 and the third arc segment 3221 themselves have good anti-deformation ability, which further improves the reinforcing effect of the reinforcing portion 32 on the cover body 31.
  • the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases, so that the reinforcement range of the second arc segment 3212 and the fourth arc segment 3222 gradually increases, and the arc-shaped second arc segment 3212 and the fourth arc segment 3222 themselves have good anti-deformation ability, which further improves the reinforcement effect of the reinforcement part 32 on the cover body 31.
  • the width of the connection area 323 gradually increases along the direction from the middle position O of the connection area 323 to the first end 3231 and the second end 3232 .
  • the middle position O of the connection area 323 is the midpoint position of the line (straight line) connecting the first end 3231 and the second end 3232 of the connection area 323, and the middle position O of the connection area 323 may be the geometric center of the connection area 323.
  • the width of the connection area 323 is the size of the connection area 323 in the first direction X.
  • the width of the connection area 323 at the middle position O is the smallest.
  • the width of the connection area 323 at the middle position O is less than twice the width of any one of the first arc segment 3211, the second arc segment 3212, the third arc segment 3221, and the fourth arc segment 3222.
  • connection area 323 is gradually enhanced from the middle position O to the two ends, and the connection area 323 itself has a good anti-deformation ability, which enhances the reinforcing effect of the connection area 323 on the cover body 31.
  • the width of the connection area 323 gradually increases from the middle position O to the two ends, and the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases along the direction from the second end 3232 to the first end 3231, and the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases along the direction from the first end 3231 to the second end 3232, the width of the reinforcing portion 32 gradually increases from the middle to the two ends, and the reinforcing portion 32 has a better reinforcing effect on the cover body 31.
  • the cover body 31 is circular, and the center line of the cover body 31 passes through the middle position O of the connection area 323 .
  • center line of the cover body 31 passes through the midpoint of the line connecting the first end 3231 and the second end 3232.
  • the center line of the cover body 31 can be the perpendicular midline of the line connecting the first end 3231 and the second end 3232 (straight line).
  • the central area of the cover body 31 is most likely to deform.
  • the central axis of the cover body 31 passes through the middle position O of the connection area 323, so that the reinforcement part 32 can reinforce the central area of the cover body 31, thereby reducing the risk of the end cover 3 being damaged due to fatigue.
  • the first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221
  • the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211
  • the first side surface 3211a and the third side surface 3221a are connected via a first rounded surface 324
  • the second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222
  • the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212
  • the second side surface 3212a and the fourth side surface 3222a are connected via a second rounded surface 325.
  • the first side surface 3211a, the second side surface 3212a, the third side surface 3221a and the fourth side surface 3222a are arc surfaces.
  • the first side surface 3211a and the second side surface 3212a can be arranged concentrically with the first arc surface 3210, and the third side surface 3221a and the fourth side surface 3222a can be arranged concentrically with the second arc surface 3220.
  • the first rounded surface 324 is an arc surface connecting the first side surface 3211a and the third side surface 3221a, and the first side surface 3211a and the third side surface 3221a can be tangent to the first rounded surface 324.
  • the second rounded surface 325 is an arc surface connecting the second side surface 3212a and the fourth side surface 3222a, and the second side surface 3212a and the fourth side surface 3222a can be tangent to the second rounded surface 325.
  • the first side surface 3211a is connected to the third side surface 3221a via the first rounded surface 324, thereby reducing the risk of stress concentration at the connection position between the first arc segment 3211 and the third arc segment 3221;
  • the second side surface 3212a is connected to the fourth side surface 3222a via the second rounded surface 325, thereby reducing the risk of stress concentration at the connection position between the second arc segment 3212 and the fourth arc segment 3222.
  • the first arc segment 3211 and the third arc segment 3221 are symmetrically arranged; and/or, the second arc segment 3212 and the fourth arc segment 3222 are symmetrically arranged; and/or, the first arc segment 3211 and the second arc segment 3212 are symmetrically arranged; and/or, the third arc segment 3221 and the fourth arc segment 3222 are symmetrically arranged.
  • the first arc segment 3211 and the third arc segment 3221 can be symmetrically arranged with respect to the first reference plane F
  • the second arc segment 3212 and the fourth arc segment 3222 can also be symmetrically arranged with respect to the first reference plane F
  • the connection area 323 can be a symmetrical structure symmetrical with respect to the first reference plane F.
  • the first arc segment 3211 and the second arc segment 3212 can be symmetrically arranged with respect to the second reference plane G
  • the third arc segment 3221 and the fourth arc segment 3222 can also be symmetrically arranged with respect to the second reference plane G
  • the connection area 323 can also be a symmetrical structure symmetrical with respect to the second reference plane G
  • the second reference plane G can be perpendicular to the first reference plane F.
  • the first arc segment 3211 and the third arc segment 3221 are symmetrically arranged. When the cover body 31 is subjected to an action force, the first arc segment 3211 and the third arc segment 3221 are subjected to substantially the same force. The first arc segment 3211 and the third arc segment 3221 have substantially the same ability to resist deformation of the cover body 31. The first arc segment 3211 and the third arc segment 3221 can both play a good role in reinforcing the cover body 31.
  • the second arc segment 3212 and the fourth arc segment 3222 are symmetrically arranged. When the cover body 31 is subjected to an action force, the second arc segment 3212 and the fourth arc segment 3222 are subjected to substantially the same force.
  • the second arc segment 3212 and the fourth arc segment 3222 have substantially the same ability to resist deformation of the cover body 31.
  • the second arc segment 3212 and the fourth arc segment 3222 can both play a good role in reinforcing the cover body 31.
  • the first arc segment 3211 and the second arc segment 3212 are symmetrically arranged. When the cover body 31 is subjected to an action force, the first arc segment 3211 and the second arc segment 3212 are subjected to substantially the same force.
  • the first arc segment 3211 and the second arc segment 3212 have substantially the same ability to resist deformation of the cover body 31.
  • the first arc segment 3211 and the second arc segment 3212 can both play a good role in reinforcing the cover body 31.
  • the third arc segment 3221 and the fourth arc segment 3222 are symmetrically arranged. When the cover body 31 is subjected to an action force, the third arc segment 3221 and the fourth arc segment 3222 are subjected to substantially the same force. The third arc segment 3221 and the fourth arc segment 3222 have substantially the same ability to resist deformation of the cover body 31. The third arc segment 3221 and the fourth arc segment 3222 can both play a good role in reinforcing the cover body 31.
  • the center angle of the first arc portion 321 is ⁇ 1 , satisfying: ⁇ 1 >90°; and/or the center angle of the second arc portion 322 is ⁇ 2 , satisfying: ⁇ 2 >90°.
  • one end of the first arc portion 321 is connected to the center of the circle where the first arc surface 3210 is located to form a first connecting line I, and the other end of the first arc portion 321 is connected to the center of the circle where the first arc surface 3210 is located to form a second connecting line K.
  • the angle between the first connecting line I and the second connecting line K is the center angle ⁇ 1 of the first arc portion 321.
  • one end of the second arc portion 322 is connected to the center of the circle where the second arc surface 3220 is located to form a third connecting line M, and the other end of the second arc portion 322 is connected to the center of the circle where the second arc surface 3220 is located to form a fourth connecting line N.
  • the angle between the third connecting line M and the fourth connecting line N is the center angle ⁇ 1 of the second arc portion 322.
  • ⁇ 1 can be a plurality of angles greater than 90°, such as 100° 135° 180° 225° 270°, etc.
  • ⁇ 2 can be a plurality of angles greater than 90°, such as 100° 135° 180° 225° 270°, etc.
  • ⁇ 1 >90° increases the reinforcement range of the first arc portion 321 on the cover body 31 ;
  • ⁇ 2 >90° increases the reinforcement range of the second arc portion 322 on the cover body 31 .
  • the reinforcement portion 32 is integrally formed with the cover body 31 .
  • the reinforcement portion 32 and the cover body 31 can be integrally formed by various molding methods, such as casting molding, stamping molding, etc.
  • the reinforcing portion 32 and the cover body 31 are integrally formed, which can enhance the connection strength between the reinforcing portion 32 and the cover body 31 and improve the long-term reliability of the end cover 3 .
  • Figure 8 is an A-A cross-sectional view of the end cover 3 shown in Figure 6;
  • Figure 9 is a bottom view of the end cover 3 shown in Figure 8.
  • the cover body 31 has a second surface 312 opposite to the first surface 311, and the cover body 31 is provided with a first recessed portion 313, which is recessed from the second surface 312 in a direction close to the first surface 311, and a reinforcing portion 32 protruding from the first surface 311 is formed at a position of the cover body 31 corresponding to the first recessed portion 313.
  • the second surface 312 is a surface of the cover body 31 opposite to the first surface 311 , and the distance between the second surface 312 and the first surface 311 may be the thickness of the cover body 31 .
  • the shape of the second recess 3163 is the same as that of the reinforcing portion 32 .
  • the first recess 313 can be formed on the second surface 312 by stamping, thereby forming the reinforcing portion 32 protruding from the first surface 311, and the reinforcing portion 32 is formed in a simple manner.
  • the first recess 313 is provided so that the cover body 31 forms a concave structure at the position where the reinforcing portion 32 is provided, so that the reinforcing portion 32 has better anti-deformation ability, and improves the reinforcing effect of the reinforcing portion 32 on the cover body 31.
  • the height of the reinforcing portion 32 protruding from the first surface 311 is H
  • the distance between the first surface 311 and the second surface 312 is D, which satisfies: 0.04 mm 2 ⁇ D*H ⁇ 0.81 mm 2 .
  • D*H may be a plurality of values between 0.04 mm 2 and 0.81 mm 2 , for example, 0.04 mm 2 , 0.06 mm 2 , 0.1 mm 2 , 0.2 mm 2 , 0.3 mm 2 , 0.4 mm 2 , 0.5 mm 2 , 0.6 mm 2 , 0.64 mm 2 , 0.7 mm 2 , 0.81 mm 2 and the like.
  • D*H can be a plurality of values between 0.06 mm2 and 0.64 mm2 , for example, 0.06 mm2 , 0.1 mm2 , 0.15 mm2 , 0.2 mm2 , 0.25 mm2 , 0.3 mm2 , 0.35 mm2 , 0.4 mm2 , 0.45 mm2 , 0.5 mm2 , 0.55 mm2 , 0.6 mm2 , 0.64 mm2 , etc.
  • 0.06 mm 2 ⁇ D*H ⁇ 0.64 mm 2 can further improve the deformation resistance of the end cover 3, on the other hand, can further reduce the space occupied by the end cover 3.
  • D*H> 0.64 mm 2 when the reinforcing portion 32 is formed by stamping, the stretching amount of the reinforcing portion 32 is too large, resulting in the weakening of the strength of the reinforcing portion 32. Therefore, D*H ⁇ 0.64 mm 2 can improve the strength of the reinforcing portion 32.
  • H can be a plurality of values between 0.25 mm and 0.8 mm, for example, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc.
  • D can be a plurality of values between 0.25 mm and 0.8 mm, for example, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, 0.8 mm, etc.
  • FIG. 10 is a partial enlarged view of the B portion of the end cover 3 shown in FIG. 8.
  • the reinforcing portion 32 has a side wall 326 and a bottom wall 327.
  • the side wall 326 is arranged around the bottom wall 327.
  • the side wall 326 and the bottom wall 327 together define a first recess 313.
  • the maximum thickness of the side wall 326 is L1
  • the maximum thickness of the bottom wall 327 is L2 .
  • the distance between the first surface 311 and the second surface 312 is D, which satisfies: L1 ⁇ D , L2 ⁇ D .
  • the bottom wall 327 is a wall of the reinforcing portion 32 disposed along the thickness direction Z.
  • the bottom wall 327 is disposed opposite to the opening of the first recess 313 along the thickness direction Z.
  • the side wall 326 is a portion of the reinforcing portion 32 disposed around the bottom wall 327.
  • the extension trajectory of the side wall 326 is the same as the shape of the first recess 313.
  • the thickness of the side wall 326 may be uniform or non-uniform. If the thickness of the side wall 326 is uniform, the maximum thickness of the side wall 326 is equal to the minimum thickness of the side wall 326.
  • the thickness of the bottom wall 327 may be uniform or non-uniform. If the thickness of the bottom wall 327 is uniform, the maximum thickness of the bottom wall 327 is equal to the minimum thickness of the bottom wall 327.
  • the thickness of the side wall 326 is non-uniform, and the thickness of the side wall 326 gradually decreases along the depth direction of the first recess 313; the thickness of the bottom wall 327 is also non-uniform, and the thickness of the bottom wall 327 gradually increases from the middle to both ends along the width direction of the first recess 313.
  • L1 and L2 are both not greater than D, so that the maximum thickness of the side wall 326 and the maximum thickness of the bottom wall 327 will not exceed the distance between the first surface 311 and the second surface 312, which can simplify the molding process and the reinforcing portion 32 can be formed by stamping, and the molding method is simple.
  • the minimum thickness of the bottom wall 327 is L 3
  • the minimum thickness of the side wall 326 is L 4 , satisfying: DL 3 ⁇ 0.2 mm; and/or, DL 4 ⁇ 0.2 mm.
  • DL 3 can be multiple values of 0 to 0.2 mm, for example, 0.01 mm, 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.16 mm, 0.2 mm, etc.
  • DL 4 can be multiple values of 0 to 0.2 mm, for example, 0.01 mm, 0.04 mm, 0.08 mm, 0.1 mm, 0.12 mm, 0.16 mm, 0.2 mm, etc.
  • DL 3 > 0.2 mm the minimum thickness of the bottom wall 327 is small, and the strength of the bottom wall 327 is poor, and the bottom wall 327 is easily damaged. Therefore, DL 3 ⁇ 0.2 mm can ensure that the bottom wall 327 has sufficient strength; if DL 4 > 0.2 mm, the minimum thickness of the side wall 326 is small, and the strength of the side wall 326 is poor, and the side wall 326 is easily damaged. Therefore, DL 4 ⁇ 0.2 mm can ensure that the side wall 326 has sufficient strength.
  • the cover body 31 has a pressure relief area 314, the first surface 311 is at least partially located in the pressure relief area 314, the cover body 31 is provided with a notch groove 315, the notch groove 315 is arranged along the edge of the pressure relief area 314, and the pressure relief area 314 is configured to be opened with the notch groove 315 as the boundary when the battery cell 10 is depressurized.
  • the reinforcement part 32 is arranged in the pressure relief area 314.
  • the pressure relief area 314 is a portion of the cover body 31 that can be opened with the notched groove 315 as a boundary when the battery cell 10 is depressurized. After the pressure relief area 314 is opened, the cover body 31 can form a discharge port at a position corresponding to the pressure relief area 314, and the discharge inside the battery cell 10 can be discharged through the discharge port to release the pressure inside the battery cell 10.
  • the first surface 311 can be completely located in the pressure relief area 314, or it can be partially located in the pressure relief area 314.
  • the remaining part of the cover body 31 at the position where the notched groove 315 is set is a weak part, and the strength of the weak part is less than the strength of other areas of the cover body 31, so that the cover body 31 is weaker at the position where the notched groove 315 is set and more easily damaged.
  • the weak part will be destroyed under the action of the discharge (electrolyte, gas, etc.) inside the battery cell 10, so that the pressure relief zone 314 opens outward.
  • the pressure relief zone 314 can be opened by flipping outward or detaching.
  • the notched groove 315 can be set on the first surface 311, and can also be set on the second surface 312.
  • the notched groove 315 can be in a variety of shapes, such as annular, arc-shaped, U-shaped, H-shaped, etc.
  • the notched groove 315 can be formed in a variety of ways, such as stamping, milling, etc.
  • the arrangement of the pressure relief area 314 enables the end cover 3 to have a pressure relief function.
  • the pressure relief area 314 can be opened with the notched groove 315 as the boundary, and has a large pressure relief area.
  • the reinforcement part 32 is arranged in the pressure relief area 314, and the reinforcement part 32 strengthens the pressure relief area 314, improves the deformation resistance of the pressure relief area 314, and when the internal pressure of the battery cell 10 changes, the pressure relief area 314 is not easy to deform, reducing the risk of the pressure relief area 314 opening during the normal use of the battery cell 10.
  • the score groove 315 is a groove extending along a closed trajectory.
  • the closed trajectory can be in various shapes, such as a circular trajectory, a rectangular trajectory, an elliptical trajectory, etc.
  • the pressure relief area 314 can be opened in a manner of being detached from the outside of the battery cell 10, so that the battery cell 10 has a larger pressure relief area, thereby improving the pressure relief efficiency.
  • the score groove 315 is in the shape of a circular ring.
  • the notched groove 315 is a groove extending along a circular trajectory.
  • the notched groove 315 in the shape of an annular ring has a simple structure and is easy to form.
  • the cover body 31 is circular, and the notch groove 315 is coaxially arranged with the cover body 31 .
  • the cover body 31 is a circular structure. It is understandable that the outer edge of the cover body 31 is circular.
  • the end cap 3 of this structure is a circular end cap.
  • the notched groove 315 is coaxially arranged with the cover body 31, that is, the center line of the notched groove 315 coincides with the center line of the cover body 31.
  • the notched groove 315 is coaxially arranged with the cover body 31 , and the pressure relief zone 314 defined by the notched groove 315 is located in the central area of the cover body 31 , which is conducive to timely opening of the pressure relief zone 314 for pressure relief.
  • the first surface 311 faces the interior of the housing 1 , and the notch groove 315 is disposed on the first surface 311 .
  • the first surface 311 will face the interior of the housing 1. Since the notched groove 315 is provided on the first surface 311, the first surface 311 faces the interior of the housing 1, so that the notched groove 315 faces the interior of the battery cell 10, and the notched groove 315 is not exposed to the exterior of the battery cell 10, thereby reducing the risk of oxidation of the position where the notched groove 315 is provided on the cover body 31 due to exposure to the exterior of the battery cell 10. Since the reinforcing portion 32 is provided on the first surface 311, the first surface 311 faces the interior of the housing 1, the reinforcing portion 32 can utilize the interior space of the battery cell 10, and the reinforcing portion 32 does not occupy the exterior space of the battery cell 10.
  • the reinforcement portion 32 includes a first arc portion 321 and a second arc portion 322 protruding from the first surface 311, and the opening of the first arc portion 321 is arranged opposite to the opening of the second arc portion 322.
  • the minimum spacing between the end of the first arc portion 321 in the extension direction and the notched groove 315 is S1 , which satisfies: S1 >0.5mm; and/or, the minimum spacing between the end of the second arc portion 322 in the extension direction and the notched groove 315 is S2 , which satisfies: S2 >0.5mm.
  • S1 can be a number of values greater than 0.5 mm, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.
  • S2 can be a number of values greater than 0.5 mm, such as 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.
  • S1 and S2 can be equal or different.
  • the first arc portion 321 has two ends in its extending direction, one end is the end of the first arc segment 3211 away from the connection area 323, and the other end is the end of the second arc segment 3212 away from the connection area 323.
  • the minimum distance between the end of the first arc segment 3211 away from the connection area 323 and the notched groove 315 and the minimum distance between the end of the second arc segment 3212 away from the connection area 323 and the notched groove 315 are both S 1 .
  • the second arc portion 322 has two ends in its extending direction, one end is the end of the third arc segment 3221 away from the connection area 323, and the other end is the end of the fourth arc segment 3222 away from the connection area 323.
  • the minimum distance between the end of the third arc segment 3221 away from the connection area 323 and the notched groove 315 and the minimum distance between the end of the fourth arc segment 3222 away from the connection area 323 and the notched groove 315 are both S 2 .
  • S 1 >0.5 mm, reducing the influence of the first arc portion 321 on the notched groove 315, and reducing the risk of squeezing the notched groove 315 due to the end of the first arc portion 321 being too close to the notched groove 315.
  • S 2 >0.5 mm, reducing the influence of the second arc portion 322 on the notched groove 315, and reducing the risk of squeezing the notched groove 315 due to the end of the second arc portion 322 being too close to the notched groove 315.
  • FIG. 11 is a partial enlarged view of the battery cell 10 at C shown in FIG. 4 .
  • the cover body 31 includes a body portion 316 and a connection portion 317 , the body portion 316 has a first surface 311 , and the connection portion 317 is disposed around the outer edge of the body portion 316 , and in the thickness direction Z, the connection portion 317 protrudes from the body portion 316 in a direction facing the inside of the housing 1 , and the connection portion 317 is used to extend into the housing 1 and form a positioning fit with the housing 1 .
  • the connecting portion 317 is a portion of the cover body 31 used to form a positioning fit with the housing 1, and the body portion 316 is a portion of the cover body 31 located inside the connecting portion 317.
  • the body portion 316 may be a circular area located in the center area of the cover body 31, and the connecting portion 317 may be an annular area surrounding the outside of the body portion 316.
  • the connecting portion 317 and the body portion 316 may be an integrally formed structure.
  • the reinforcing portion 32 is provided on the body portion 316, and the reinforcing portion 32 can strengthen the body portion 316.
  • the outer circumferential surface of the connection portion 317 contacts the inner circumferential surface of the housing 1, so that the connection portion 317 and the housing 1 are positioned and matched.
  • the outer circumferential surface of the connection portion 317 and the inner circumferential surface of the housing 1 both extend along the thickness direction Z.
  • the outer circumferential surface of the connection portion 317 and the inner circumferential surface of the housing 1 are both cylindrical surfaces extending along the thickness direction Z.
  • connection portion 317 may be a portion of the end cap 3 for electrically connecting to the first pole tab 21.
  • the connection portion 317 is directly connected to the first pole tab 21, for example, the connection portion 317 is welded to the pole tab; in other embodiments, as shown in FIG. 11 , the connection portion 317 is indirectly connected to the first pole tab 21 through the current collecting member 5, for example, the current collecting member 5 is welded to the first pole tab 21, and the connection portion 317 is welded to the current collecting member 5.
  • connection portion 317 protrudes from the main body portion 316 in a direction facing the interior of the shell 1 , and the connection portion 317 can form a positioning fit with the shell 1 , which can improve the assembly efficiency of the end cover 3 and the shell 1 .
  • the connecting portion 317 has a third surface 3171 facing the interior of the shell 1, the first surface 311 faces the interior of the shell 1, and the reinforcing portion 32 does not exceed the third surface 3171 along the direction facing the interior of the shell 1.
  • the third surface 3171 is the inner surface of the connection portion 317 facing the inside of the housing 1 along the thickness direction Z, and the third surface 3171 may be a toroidal surface. In the embodiment where the connection portion 317 is directly connected to the first pole tab 21, the third surface 3171 abuts against the first pole tab 21; as shown in FIG. 11 , in the embodiment where the connection portion 317 is connected to the first pole tab 21 through the current collecting member 5, the third surface 3171 abuts against the current collecting member 5.
  • the surface of the reinforcement part 32 facing the inside of the shell 1 can be flush with the third surface 3171, or it can be farther away from the electrode assembly 2 located in the shell 1 than the third surface 3171, so that the reinforcement part 32 does not exceed the third surface 3171 along the direction facing the inside of the shell 1.
  • the reinforcing portion 32 does not extend beyond the third surface 3171 along the direction facing the interior of the shell 1.
  • the reinforcing portion 32 is not easy to interfere with the internal components of the battery cell 10.
  • the body portion 316 has a fourth surface 3161 and a fifth surface 3162 opposite to each other, and the connection portion 317 protrudes from the fourth surface 3161.
  • the body portion 316 has a pressure relief area 314, and the body portion 316 is provided with a notched groove 315 and a second recess 3163.
  • the notched groove 315 is provided along the edge of the pressure relief area 314, and the pressure relief area 314 is configured to be opened with the notched groove 315 as a boundary when the battery cell 10 is depressurized, and the second recess 3163 is recessed from the fifth surface 3162 in a direction close to the fourth surface 3161.
  • the projection of the bottom surface of the second recess 3163 along the thickness direction Z covers the notched groove 315.
  • the fourth surface 3161 faces the interior of the housing 1 , and the fourth surface 3161 and the first surface 311 may be the same surface of the main body 316 ; in the embodiment shown in FIG. 8 , the fourth surface 3161 and the first surface 311 may also be two surfaces that are spaced apart in the thickness direction Z.
  • the fifth surface 3162 is the surface of the main body 316 that faces away from the housing 1 in the thickness direction Z, and the fifth surface 3162 may be a circular surface surrounding the outer side of the second recess 3163 .
  • the connecting portion 317 protrudes from the fourth surface 3161 in a direction close to the interior of the housing 1.
  • the second recess 3163 may be a cylindrical groove, a rectangular parallelepiped groove, etc.
  • the notched groove 315 may be provided on the first surface 311, or may be provided on the bottom surface of the second recess 3163. In the embodiment shown in FIG8 , the notched groove 315 is provided on the first surface 311.
  • the second recess 3163 is provided so that there is a certain distance between the pressure relief area 314 and the fifth surface 3162.
  • the external component may be the bottom wall 327 of the box body 20, a thermal management component, etc.
  • the fifth surface 3162 is the surface of the end cap 3 farthest from the shell 1 .
  • the fifth surface 3162 is the surface of the end cap 3 farthest from the housing 1 along the thickness direction Z, and is also the surface of the battery cell 10 farthest from the housing 1 along the thickness direction Z. Along the thickness direction Z, the fifth surface 3162 is farther from the housing 1 than the connecting portion 317 .
  • the fifth surface 3162 may serve as a supporting surface for the battery cell 10 .
  • the fifth surface 3162 contacts the external component to ensure the stability of the battery cell 10 when placed on the external component.
  • a convex portion 3164 protruding from the fourth surface 3161 is formed at a position corresponding to the main body 316 and the second concave portion 3163 , and a surface of the convex portion 3164 facing away from the fourth surface 3161 is the first surface 311 .
  • the shape of the convex portion 3164 may be the same as the shape of the second concave portion 3163. Taking the second concave portion 3163 as a cylindrical groove as an example, the convex portion 3164 may be a cylindrical boss protruding from the fourth surface 3161. The second concave portion 3163 may be formed on the fifth surface 3162 by stamping, thereby forming the convex portion 3164 protruding from the fourth surface 3161.
  • the provision of the convex portion 3164 can increase the strength of the area where the second concave portion 3163 is provided on the main body 316 .
  • the bottom surface of the second recess 3163 is disposed opposite to the first surface 311 along the thickness direction Z.
  • the body portion 316 is provided with a first recess 313, which is recessed from the bottom surface of the second recess 3163 in a direction close to the first surface 311, and a reinforcing portion 32 protruding from the first surface 311 is formed at a position of the body portion 316 corresponding to the first recess 313.
  • the bottom surface of the second recess 3163 is the second surface 312 of the cover body 31.
  • the distance between the fourth surface 3161 and the fifth surface 3162 may be equal to the distance between the first surface 311 and the second surface 312.
  • the first recess 313 can be formed on the bottom surface of the second recess 3163 by stamping, thereby forming the reinforcing portion 32 protruding from the first surface 311, and the reinforcing portion 32 is formed in a simple manner.
  • the first recess 313 is provided so that the main body 316 forms a concave structure at the location where the reinforcing portion 32 is provided, so that the reinforcing portion 32 has better anti-deformation ability, and improves the reinforcing effect of the reinforcing portion 32 on the main body 316.
  • the cover body 31 further includes an edge portion 318 , which is disposed around the outer edge of the connecting portion 317 , and the edge portion 318 is used to connect to one end of the housing 1 where an opening is disposed.
  • the edge portion 318 is the portion where the cover body 31 is connected to the housing 1 , and the edge portion 318 and the housing 1 may be connected in a variety of ways, such as welding, bonding, etc.
  • the edge portion 318 may be a circular ring structure surrounding the outer side of the connection portion 317 .
  • the edge portion 318 has a step surface 3181 facing the shell 1, the step surface 3181 is connected to the outer peripheral surface of the connecting portion 317, and the step surface 3181 is used to abut against one end of the shell 1 where an opening is set, so that the cover body 31 closes the opening of the shell 1.
  • the fifth surface 3162 may be farther from the shell 1 than the edge portion 318, so that there is a height difference between the fifth surface 3162 and the edge in the thickness direction Z, so that the welding slag generated by the welding of the edge portion 318 and the shell 1 is not easy to protrude from the fifth surface 3162, thereby ensuring the flatness of the fifth surface 3162 and ensuring the stability of the battery cell 10 when the fifth surface 3162 is used as a supporting surface.
  • the edge portion 318 When assembling the end cover 3 and the shell 1, after the connection portion 317 is positioned and matched with the shell 1, the edge portion 318 can be abutted against one end of the shell 1 where the opening is set, and the edge portion 318 can be conveniently connected to the end of the shell 1 where the opening is set, for example, the edge portion 318 can be welded to the end of the shell 1 where the opening is set.
  • the material of the end cap 3 includes at least one of steel, stainless steel, and nickel-plated steel.
  • the material of the end cap 3 may be steel, stainless steel, nickel-plated steel, or two or three of steel, stainless steel and nickel-plated steel.
  • the end cap 3 is made of nickel-plated steel, after the end cap 3 is provided with the notched groove 315, the nickel layer of the end cap 3 at the position where the notched groove 315 is provided may be damaged, and the end cap 3 is easily oxidized at the position where the notched groove 315 is provided.
  • the notched groove 315 is not exposed to the outside of the battery cell 10, which reduces the risk of oxidation at the position where the end cap 3 is provided with the notched groove 315, and can effectively improve the service life of the end cap 3.
  • the end cover 3 has better strength and rigidity and a longer service life.
  • the embodiment of the present application provides a battery cell 10, comprising a housing 1 and an end cover 3 provided in any one of the above embodiments.
  • the housing 1 has an opening, and a cover body 31 closes the opening.
  • the first surface 311 faces the interior of the housing 1 .
  • the first surface 311 may also be a surface of the cover body 31 that faces away from the housing 1 along the thickness direction Z.
  • An embodiment of the present application provides a battery 100, comprising a battery cell 10 provided in any one of the above embodiments.
  • An embodiment of the present application provides an electrical device, comprising the battery 100 provided in any one of the above embodiments.
  • the embodiment of the present application provides a circular end cap, and the end cap 3 is used to close the opening of the shell 1 of the battery cell 10.
  • the end cap 3 includes a cover body 31 and a reinforcement portion 32, and the reinforcement portion 32 is arranged on the cover body 31.
  • the cover body 31 includes a body portion 316, a connection portion 317 and an edge portion 318.
  • the connection portion 317 is arranged around the outer edge of the body portion 316, and the edge portion 318 is arranged around the outer edge of the connection portion 317, connected to the end of the shell 1 for extending into the shell 1 and forming a positioning match with the shell 1.
  • the edge portion 318 is used to connect the shell 1.
  • the end of the opening is used to connect the shell 1.
  • the body portion 316 has a fourth surface 3161 and a fifth surface 3162 opposite to each other, the connection portion 317 protrudes from the fourth surface 3161, and the fifth surface 3162 is the surface of the end cap 3 farthest from the shell 1.
  • the connection portion 317 and the body portion 316 are closer to the shell 1 than the fifth surface 3162.
  • the body portion 316 is provided with a notched groove 315 and a second recessed portion 3163.
  • the second recessed portion 3163 is recessed from the fifth surface 3162 in a direction close to the fourth surface 3161.
  • the notched groove 315 is annular.
  • the notched groove 315 defines a pressure relief area 314.
  • the pressure relief area 314 is configured to be opened with the notched groove 315 as a boundary when the battery cell 10 is depressurized.
  • the projection of the bottom surface of the second recessed portion 3163 along the thickness direction Z covers the notched groove 315.
  • the position of the body portion 316 corresponding to the second recessed portion 3163 forms a convex portion 3164 protruding from the fourth surface 3161.
  • the surface of the convex portion 3164 facing away from the fourth surface 3161 is the first surface 311.
  • the notched groove 315 is provided on the first surface 311.
  • the bottom surface of the second recessed portion 3163 is the second surface 312.
  • the second surface 312 is arranged opposite to the first surface 311 along the thickness direction Z.
  • the main body 316 is further provided with a first recess 313 which is recessed from the second surface 312 in a direction close to the first surface 311 , and a reinforcement portion 32 protruding from the first surface 311 is formed at a position of the main body 316 corresponding to the first recess 313 .
  • the reinforcing portion 32 includes a first arc portion 321 and a second arc portion 322 disposed on the first surface 311, and the opening of the first arc portion 321 is disposed opposite to the opening of the second arc portion 322.
  • the first arc portion 321 and the second arc portion 322 are connected to form a connection area 323, and the connection area 323 has a first end 3231 and a second end 3232 opposite to each other.
  • the first arc portion 321 includes a first arc segment 3211 and a second arc segment 3212
  • the second arc portion 322 includes a third arc segment 3221 and a fourth arc segment 3222.
  • the first arc segment 3211 and the third arc segment 3221 are connected to the first end 3231, and the second arc segment 3212 and the fourth arc segment 3222 are connected to the second end 3232.
  • the distance between the first arc segment 3211 and the third arc segment 3221 gradually increases.
  • the distance between the second arc segment 3212 and the fourth arc segment 3222 gradually increases.
  • the width of the connection area 323 gradually increases.
  • the first arc segment 3211 has a first side surface 3211a facing the third arc segment 3221, the third arc segment 3221 has a third side surface 3221a facing the first arc segment 3211, and the first side surface 3211a and the third side surface 3221a are connected through a first rounded surface 324;
  • the second arc segment 3212 has a second side surface 3212a facing the fourth arc segment 3222, the fourth arc segment 3222 has a fourth side surface 3222a facing the second arc segment 3212, and the second side surface 3212a and the fourth side surface 3222a are connected through a second rounded surface 325.
  • the first arc segment 3211 is symmetrically arranged with the third arc segment 3221; the second arc segment 3212 is symmetrically arranged with the fourth arc segment 3222; the first arc segment 3211 is symmetrically arranged with the second arc segment 3212; the third arc segment 3221 is symmetrically arranged with the fourth arc segment 3222.
  • the center angle of the first arc portion 321 is ⁇ 1 , ⁇ 1 >90°; the center angle of the second arc portion 322 is ⁇ 2 , ⁇ 2 >90°.
  • the height of the reinforcing portion 32 protruding from the first surface 311 is H
  • the distance between the first surface 311 and the second surface 312 is D
  • 0.04mm2 ⁇ D * H ⁇ 0.81mm2 is 0.04mm2 ⁇ D * H ⁇ 0.81mm2 .
  • the minimum spacing between the end of the first arc portion 321 in the extension direction and the notched groove 315 is S1 , S1 >0.5mm
  • the minimum spacing between the end of the second arc portion 322 in the extension direction and the notched groove 315 is S2 , S2 >0.5mm.

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

Abstract

本申请实施例提供了一种端盖、电池单体、电池及用电设备,属于电池技术领域。其中,端盖包括盖本体和加强部。盖本体用于封闭电池单体的壳体的开口,沿盖本体的厚度方向,盖本体具有第一表面。加强部凸出于第一表面,加强部用于加强盖本体。在这样的端盖中,盖本体在厚度方向上的第一表面设置有加强部,加强部对盖本体起到加强作用,提高了端盖的抗变形能力,提高了端盖的抗疲劳性能,降低端盖因疲劳而被破坏的风险,使得端盖具有更长的使用寿命,进而提高了电池单体的使用寿命。

Description

端盖、电池单体、电池及用电设备 技术领域
本申请涉及电池技术领域,具体而言,涉及一种端盖、电池单体、电池及用电设备。
背景技术
电池广泛用于电子设备,例如手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等等。
在电池技术中,不仅需要考虑电池单体的安全性,还需要考虑电池单体的使用寿命。因此,如何提高电池单体的使用寿命是亟需解决的技术问题。
发明内容
本申请实施例提供一种端盖、电池单体、电池及用电设备,能够有效提高电池单体的使用寿命。
第一方面,本申请实施例提供一种端盖,用于电池单体,包括盖本体和加强部;盖本体用于封闭电池单体的壳体的开口,沿盖本体的厚度方向,盖本体具有第一表面;加强部凸出于第一表面,加强部用于加强盖本体。
上述技术方案中,盖本体在厚度方向上的第一表面设置有加强部,加强部对盖本体起到加强作用,提高了端盖的抗变形能力,提高了端盖的抗疲劳性能,降低端盖因疲劳而被破坏的风险,使得端盖具有更长的使用寿命,进而提高了电池单体的使用寿命。
在一些实施例中,加强部包括凸出于第一表面的第一圆弧部和第二圆弧部,第一圆弧部的开口与第二圆弧部的开口背对设置。第一圆弧部和第二圆弧部均为圆弧形,且两者的开口背对设置,这种结构的加强部辐射范围更大,能够增大对盖本体的加强范围,圆弧形的第一圆弧部和第二圆弧部自身具有更好的抗变形能力,在受到沿厚度方向的作用力时不易发生变形,能够对盖本体起到更好的加强效果,进一步提高了端盖的抗变形能力和抗疲劳性能。
在一些实施例中,第一圆弧部与第二圆弧部相连形成连接区,连接区具有相对的第一端和第二端,第一圆弧部包括第一圆弧段和第二圆弧段,第二圆弧部包括第三圆弧段和第四圆弧段,第一圆弧段和第三圆弧段连接于第一端,第二圆弧段和第四圆弧段连接于第二端;沿第二端指向第一端的方向,第一圆弧段与第三圆弧段的间距逐渐增大;沿第一端指向第二端的方向,第二圆弧段与第四圆弧段的间距逐渐增大。第一圆弧部与第二圆弧部相连形成连接区,连接区能够对盖本体起到很好的加强作用。沿第二端指向第一端的方向,第一圆弧段与第三圆弧段的间距逐渐增大,使得第一圆弧段和第三圆弧段的加强范围逐渐增大,且圆弧形的第一圆弧段和第三圆弧段自身具有很好的抗变形能力,进一步提高了加强部对盖本体的加强效果。沿第一端指向第二端的方向,第二圆弧段与第四圆弧段的间距逐渐增大,使得第二圆弧段和第四圆弧段的加强范围逐渐增大,且圆弧形的第二圆弧段和第四圆弧段自身具有很好的抗变形能力,进一步提高了加强部对盖本体的加强效果。
在一些实施例中,沿连接区的中间位置到第一端和第二端的方向,连接区的宽度逐渐增大。这样,连接区从中间位置到两端的加强能力逐渐增强,连接区自身具有很好的抗变形能力,增强了连接区对盖本体的加强效果。此外,由于连接区宽度从中间位置到两端逐渐增大,且第一圆弧段与第三圆弧段之间的距离沿第二端指向第一端的方向逐渐增大,第二圆弧段与第四圆弧段之间的距离沿第一端指向第二端的方向逐渐增大,使得加强部的宽度从中间到两端逐渐增大,加强部对盖本体起到更好的加强效果。
在一些实施例中,盖本体为圆形,盖本体的中心线经过中间位置。在电池单体的内部压力发生变化时,盖本体的中心区域最容易发生变形,盖本体的中心轴线经过连接区的中间位置,使得加强部能够对盖本体的中心区域进行加强,从而降低端盖因疲劳而被破坏的风险。
在一些实施例中,第一圆弧段具有面向第三圆弧段的第一侧面,第三圆弧段具有面向第一圆弧段的第三侧面,第一侧面与第三侧面通过第一圆角面连接;和/或,第二圆弧段具有面向第四圆弧段的第二侧面,第四圆弧段具有面向第二圆弧段的第四侧面,第二侧面与第四侧面通过第二圆角面连接。第一侧面与第三侧面通过第一圆角面连接,降低第一圆弧段与第三圆弧段连接位置出现应力集中的风险;第二侧面与第四侧面通过第二圆角面连接,降低第二圆弧段与第四圆弧段连接位置出现应急集中的风险。
在一些实施例中,第一圆弧段与第三圆弧段对称设置;和/或,第二圆弧段与第四圆弧段对称设置;和/或,第一圆弧段与第二圆弧段对称设置;和/或,第三圆弧段与第四圆弧段对称设置。第一圆弧段和第三圆弧段对称设置,在盖本体受到作用力时,第一圆弧段和第三圆弧段受力基本一致,第一圆弧段和第三圆弧段抵抗盖本体发生变形的能力基本一致,第一圆弧段和第三圆弧段均能够对盖本体起到很好的加强作用。第二圆弧段和第四圆弧段对称设置,在盖本体受到作用力时,第二圆弧段和第四圆弧段受力基本一致,第二圆弧段和第四圆弧段抵抗盖本体发生变形的能力基本一致,第二圆弧段和第四圆弧段均能够对盖本体起到很好的加强作用。第一圆弧段和第二圆弧段 对称设置,在盖本体受到作用力时,第一圆弧段和第二圆弧段受力基本一致,第一圆弧段和第二圆弧段抵抗盖本体发生变形的能力基本一致,第一圆弧段和第二圆弧段均能够对盖本体起到很好的加强作用。第三圆弧段和第四圆弧段对称设置,在盖本体受到作用力时,第三圆弧段和第四圆弧段受力基本一致,第三圆弧段和第四圆弧段抵抗盖本体发生变形的能力基本一致,第三圆弧段和第四圆弧段均能够对盖本体起到很好的加强作用。
在一些实施例中,第一圆弧部的圆心角为θ 1,满足:θ 1>90°;和/或,第二圆弧部的圆心角为θ 2,满足:θ 2>90°。θ 1>90°增大了第一圆弧部对盖本体的加强范围;θ 2>90°增大了第二圆弧部对盖本体的加强范围。
在一些实施例中,加强部与盖本体一体成型。这样,能够增强加强部与盖本体的连接强度,提高端盖的长期可靠性。
在一些实施例中,沿厚度方向,盖本体具有与第一表面相对的第二表面,盖本体设置有第一凹部,第一凹部从第二表面沿靠近第一表面的方向凹陷,并在盖本体与第一凹部相对应的位置形成凸出于第一表面的加强部。在成型时,可以通过冲压的方式在第二表面上成型出第一凹部,进而形成凸出于第一表面的加强部,加强部的成型方式简单。第一凹部的设置使得盖本体在设置加强部的位置形成凹陷结构,使得加强部具有更好的抗变形能力,提高了加强部对盖本体的加强效果。
在一些实施例中,沿厚度方向,加强部凸出第一表面的高度为H,第一表面与第二表面的距离为D,满足:0.04mm 2≤D*H≤0.81mm 2。当D*H<0.04mm 2时,D和H中的至少一者的厚度过小,端盖的抗变形能力较差,端盖容易发生变形。当D*H>0.81mm 2时,D和H中的至少一者的厚度过大,端盖占用空间较大。因此,0.04mm 2≤D*H≤0.81mm 2,一方面,能够提高端盖的抗变形能力,另一方面,能够使得端盖不会占用较大的空间。
在一些实施例中,0.06mm 2≤D*H≤0.64mm 2。这样,一方面,能够进一步提高端盖的抗变形能力,另一方面,进一步减小端盖占用的空间。此外,当D*H>0.64mm 2时,在采用冲压成型的方式成型加强部时,加强部的拉伸量过大,导致加强部的强度变弱。因此,D*H≤0.64mm 2,能够提高加强部的强度。
在一些实施例中,0.25mm≤H≤0.8mm;和/或,0.25mm≤D≤0.8mm。当H<0.25mm时,加强部凸出于第一表面的高度较小,加强部对盖本体的加强作用较小。当H>0.8mm时,加强部凸出于第一表面的高度较大,加强部占用较大空间。因此,0.25mm≤H≤0.8mm,第一方面,能够提高加强部对盖本体的加强效果,另一方面,能够减小加强部占用的空间。当D<0.25mm时,第一表面与第二表面的距离较小,盖本体的抗变形能力较差,盖本体的强度也较差。当D>0.8mm时,盖本体的厚度较大,盖本体占用较大空间。因此,0.25mm≤H≤0.8mm,第一方面,能够提高盖本体的抗变形能力和盖本体的强度,另一方面,能够减小盖本体占用的空间。
在一些实施例中,加强部具有侧壁和底壁,侧壁围设于底壁的周围,侧壁与底壁共同限定出第一凹部,侧壁的最大厚度为L 1,底壁的最大厚度为L 2;沿厚度方向,第一表面与第二表面的距离为D,满足:L 1≤D,L 2≤D。L 1和L 2均不大于D,使得侧壁的最大厚度和底壁的最大厚度均不会超过第一表面与第二表面之间的距离,可以简化成型工艺,可以通过冲压的方式成型加强部,成型方式简单。
在一些实施例中,底壁的最小厚度为L 3,侧壁的最小厚度为L 4,满足:D-L 3≤0.2mm;和/或,D-L 4≤0.2mm。若D-L 3>0.2mm,底壁的最小厚度较小,而底壁的强度较差,底壁容易被破坏。因此,D-L 3≤0.2mm能够保证底壁具有足够的强度;若D-L 4>0.2mm,侧壁的最小厚度较小,而侧壁的强度较差,侧壁容易被破坏。因此,D-L 4≤0.2mm能够保证侧壁具有足够的强度。
在一些实施例中,盖本体具有泄压区,第一表面至少部分位于泄压区,盖本体设置有刻痕槽,刻痕槽沿泄压区的边缘设置,泄压区被配置为在电池单体泄压时以刻痕槽为边界打开;其中,加强部设置于泄压区。泄压区的设置使得端盖具有泄压功能,泄压区能够以刻痕槽为边界打开,具有较大的泄压面积。加强部设置于泄压区,加强部对泄压区起到加强作用,提高泄压区的抗变形能力,在电池单体内部压力发生变化时,泄压区不易发生变形,降低泄压区在电池单体正常使用过程中打开的风险。
在一些实施例中,刻痕槽为沿封闭轨迹延伸的槽。在电池单体泄压时,泄压区可以以向电池单体外部脱离的方式打开,使得电池单体具有较大的泄压面积,提高了泄压效率。
在一些实施例中,刻痕槽为圆环形。圆环形的刻痕槽结构简单,成型方便。
在一些实施例中,盖本体为圆形,刻痕槽与盖本体同轴设置。这样,由刻痕槽限定的泄压区位于盖本体的中心区域,有利于泄压区及时打开泄压。
在一些实施例中,第一表面面向壳体的内部,刻痕槽设置于第一表面。由于刻痕槽设置于第一表面,第一表面面向壳体的内部,使得刻痕槽面向电池单体的内部,刻痕槽并未暴露于电池单体的外部,降低盖本体设置刻痕槽的位置因暴露于电池单体的外部而被氧化的风险。由于加强部设置于第一表面,第一表面面向壳体的内部,加强部可以利用电池单体的内部空间,加强部不会占用电池单体的外部的空间。
在一些实施例中,加强部包括凸出于第一表面的第一圆弧部和第二圆弧部,第一圆弧部的开口与第二圆 弧部的开口背对设置;第一圆弧部在其延伸方向上的端部与刻痕槽的最小间距为S 1,满足:S 1>0.5mm;和/或,第二圆弧部在其延伸方向上的端部与刻痕槽的最小间距为S 2,满足:S 2>0.5mm。S 1>0.5mm,降低第一圆弧部对刻痕槽的影响,降低因第一圆弧部的端部与刻痕槽过近而对刻痕槽造成挤压的风险。S 2>0.5mm,降低第二圆弧部对刻痕槽的影响,降低因第二圆弧部的端部与刻痕槽过近而对刻痕槽造成挤压的风险。
在一些实施例中,盖本体包括本体部和连接部,本体部具有第一表面,连接部环绕设置于本体部的外边缘,在厚度方向上,连接部沿面向壳体的内部的方向凸出于本体部,连接部用于延伸至壳体内,并与壳体形成定位配合。连接部沿面向壳体的内部的方向凸出于本体部,连接部能够与壳体形成定位配合,能够提高端盖与壳体的装配效率。
在一些实施例中,沿厚度方向,连接部具有面向壳体的内部的第三表面,第一表面面向壳体的内部,加强部沿面向壳体内部的方向不超出第三表面。这样,在连接部的第三表面与电池单体的内部的部件抵靠时,加强部不易与电池单体的内部的部件发生干涉。
在一些实施例中,沿厚度方向,本体部具有相对的第四表面和第五表面,连接部凸出于第四表面;本体部具有泄压区,本体部设置有刻痕槽和第二凹部,刻痕槽沿泄压区的边缘设置,泄压区被配置为在电池单体泄压时以刻痕槽为边界打开,第二凹部从第五表面沿靠近第四表面的方向凹陷;其中,第二凹部的底面沿厚度方向的投影覆盖刻痕槽。第二凹部的设置使得泄压区与第五表面之间存在一定距离,在第五表面与外部部件接触时,能够降低外部部件对泄压区的影响,使得泄压区能够在电池单体泄压时向外打开,降低泄压区受到外部部件的阻碍作用,而造成泄压区无法正常打开的风险。
在一些实施例中,沿厚度方向,第五表面为端盖最远离壳体的表面。第五表面可以作为电池单体的支撑面,电池单体放置于外部部件时,第五表面与外部部件接触,保证电池单体放置于外部部件的稳定性。
在一些实施例中,本体部与第二凹部相对应的位置形成凸出于第四表面的凸部,凸部背离第四表面的表面为第一表面。凸部的设置能够增大本体部设置第二凹部区域的强度。
在一些实施例中,沿所述厚度方向,第二凹部的底面与第一表面相对设置;本体部设置有第一凹部,第一凹部从第二凹部的底面沿靠近第一表面的方向凹陷,并在本体部与第一凹部相对应的位置形成凸出于第一表面的加强部。在成型时,可以通过冲压的方式在第二凹部的底面上成型出第一凹部,进而形成凸出于第一表面的加强部,加强部的成型方式简单。第一凹部的设置使得本体部在设置加强部的位置形成凹陷结构,使得加强部具有更好的抗变形能力,提高了加强部对本体部的加强效果。
在一些实施例中,盖本体还包括边缘部,边缘部环绕设置于连接部的外边缘,边缘部用于连接壳体设置开口的一端。在组装端盖和壳体时,连接部与壳体定位配合后,边缘部可以抵靠于壳体设置开口的一端,可方便地将边缘部连接于壳体设置开口的一端,比如,将边缘部焊接于壳体设置开口的一端。
在一些实施例中,端盖的材料包括钢、不锈钢和镀镍钢中的至少一种。这种端盖具有更好的强度和刚度,使用寿命更长。
第二方面,本申请实施例一种电池单体,包括壳体和上述第一方面任意一个实施例提供的端盖;壳体具有开口;盖本体封闭开口。
在一些实施例中,沿厚度方向,第一表面面向壳体的内部。
第三方面,本申请实施例一种电池,包括上述第二方面任意一个实施例提供的电池单体。
第四方面,本申请实施例提供一种用电设备,包括上述第三方面任意一个实施例提供的电池。
附图说明
为了更清楚地说明本申请实施例的技术方案,下面将对实施例中所需要使用的附图作简单地介绍,应当理解,以下附图仅示出了本申请的某些实施例,因此不应被看作是对范围的限定,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他相关的附图。
图1为本申请一些实施例提供的车辆的结构示意图;
图2为本申请一些实施例提供的电池的爆炸图;
图3为本申请一些实施例提供的电池单体的爆炸图;
图4为图3所示的电池单体的剖视图;
图5为图4所示的端盖的轴测图;
图6为图5所示的端盖的俯视图;
图7为图6所示的加强部的结构示意图;
图8为图6所示的端盖的A-A剖视图;
图9为图8所示的端盖的仰视图;
图10为图8所示的端盖的B处的局部放大图;
图11为4所示的电池单体的C处的局部放大图。
图标:1-壳体;11-壁部;2-电极组件;21-第一极耳;22-第二极耳;3-端盖;31-盖本体;311-第一表面;312-第二表面;313-第一凹部;314-泄压区;315-刻痕槽;316-本体部;3161-第四表面;3162-第五表面;3163-第二凹部;3164-凸部;317-连接部;3171-第三表面;318-边缘部;3181-台阶面;32-加强部;321-第一圆弧部;3210-第一圆弧面;3211-第一圆弧段;3211a-第一侧面;3212-第二圆弧段;3212a-第二侧面;322-第二圆弧部;3220-第二圆弧面;3221-第三圆弧段;3221a-第三侧面;3222-第四圆弧段;3222a-第四侧面;323-连接区;3231-第一端;3232-第二端;324-第一圆角面;325-第二圆角面;326-侧壁;327-底壁;4-电极端子;5-集流构件;10-电池单体;20-箱体;201-第一部分;202-第二部分;100-电池;200-控制器;300-马达;1000-车辆;O-中间位置;F-第一参考面;G-第二参考面;I-第一连线;K-第二连线;M-第三连线;N-第四连线;X-第一方向;Z-厚度方向。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚,下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚地描述,显然,所描述的实施例是本申请一部分实施例,而不是全部的实施例。基于本申请中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本申请保护的范围。
除非另有定义,本申请所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同;本申请中在申请的说明书中所使用的术语只是为了描述具体的实施例的目的,不是旨在于限制本申请;本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形,意图在于覆盖不排他的包含。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象,而不是用于描述特定顺序或主次关系。
在本申请中提及“实施例”意味着,结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例,也不是与其它实施例互斥的独立的或备选的实施例。
本申请中术语“和/或”,仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,本申请中字符“/”,一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中,相同的附图标记表示相同的部件,并且为了简洁,在不同实施例中,省略对相同部件的详细说明。应理解,附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸,以及集成装置的整体厚度、长宽等尺寸仅为示例性说明,而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
本申请中,电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等,本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等,本申请实施例对此也不限定。电池单体一般按封装的方式分成三种:柱形电池单体、方形电池单体和软包电池单体,本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如,本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液,电极组件由正极片、负极片和隔离膜组成。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正极片包括正极集流体和正极活性物质层,正极活性物质层涂覆于正极集流体的表面,未涂敷正极活性物质层的正极集流体凸出于已涂覆正极活性物质层的正极集流体,未涂敷正极活性物质层的正极集流体作为正极耳。以锂离子电池为例,正极集流体的材料可以为铝,正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极片包括负极集流体和负极活性物质层,负极活性物质层涂覆于负极集流体的表面,未涂敷负极活性物质层的负极集流体凸出于已涂覆负极活性物质层的负极集流体,未涂敷负极活性物质层的负极集流体作为负极耳。负极集流体的材料可以为铜,负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断,正极耳的数量为多个且层叠在一起,负极耳的数量为多个且层叠在一起。隔离膜的材质可以为PP(polypropylene,聚丙烯)或PE(polyethylene,聚乙烯)等。此外,电极组件可以是卷绕式结构,也可以是叠片式结构,本申请实施例并不限于此。
发明人注意到,电池单体在使用过程中,电池单体内部可能会产生气体,使得电池单体的内部压力发生 变化,造成电池单体的端盖发生变形,长此以往,端盖容易因疲劳而被破坏,影响电池单体的使用寿命。
鉴于此,本申请实施例提供一种端盖,盖本体在厚度方向上的第一表面设置有加强部,通过加强部对盖本体进行加强。
在这样的端盖中,加强部对盖本体起到加强作用,提高了端盖的抗变形能力,提高了端盖的抗疲劳性能,降低端盖因疲劳而被破坏的风险,使得端盖具有更长的使用寿命,进而提高了电池单体的使用寿命。
本申请实施例描述的技术方案适用于电池以及使用电池的用电设备。
用电设备可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车,新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等;航天器包括飞机、火箭、航天飞机和宇宙飞船等等;电动玩具包括固定式或移动式的电动玩具,例如,游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等;电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具,例如,电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电设备不做特殊限制。
以下实施例为了方便说明,以用电设备为车辆为例进行说明。
请参照图1,图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000的内部设置有电池100,电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电,例如,电池100可以作为车辆1000的操作电源。
车辆1000还可以包括控制器200和马达300,控制器200用来控制电池100为马达300供电,例如,用于车辆1000的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中,电池100不仅仅可以作为车辆1000的操作电源,还可以作为车辆1000的驱动电源,代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2,图2为本申请一些实施例提供的电池100的爆炸图,电池100包括电池单体10和箱体20,箱体20用于容纳电池单体10。
其中,箱体20是容纳电池单体10的部件,箱体20为电池单体10提供容纳空间,箱体20可以采用多种结构。在一些实施例中,箱体20可以包括第一部分201和第二部分202,第一部分201与第二部分202相互盖合,以限定出用于容纳电池单体10的容纳空间。第一部分201和第二部分202可以是多种形状,比如,长方体、圆柱体等。第一部分201可以是一侧开放的空心结构,第二部分202也可以是一侧开放的空心结构,第二部分202的开放侧盖合于第一部分201的开放侧,则形成具有容纳空间的箱体20。也可以是第一部分201为一侧开放的空心结构,第二部分202为板状结构,第二部分202盖合于第一部分201的开放侧,则形成具有容纳空间的箱体20。第一部分201与第二部分202可以通过密封元件来实现密封,密封元件可以是密封圈、密封胶等。
在电池100中,电池单体10可以是一个、也可以是多个。若电池单体10为多个,多个电池单体10之间可串联或并联或混联,混联是指多个电池单体10中既有串联又有并联。可以是多个电池单体10先串联或并联或混联组成电池模块,多个电池模块再串联或并联或混联形成一个整体,并容纳于箱体20内。也可以是所有电池单体10之间直接串联或并联或混联在一起,再将所有电池单体10构成的整体容纳于箱体20内。
请参照图3和图4,图3为本申请一些实施例提供的电池单体10的爆炸图;图4为图3所示的电池单体10的剖视图。电池单体10可以包括壳体1、电极组件2和端盖3。
壳体1是用于容纳电极组件2的部件,壳体1可以是一端形成开口的空心结构。壳体1可以是多种形状,比如,圆柱体、长方体等。壳体1的材质可以是多种,比如,铜、铁、铝、钢、铝合金等。
电极组件2是电池单体10中发生电化学反应的部件。电极组件2可以包括正极片、负极片和隔离膜。电极组件2可以是由正极片、隔离膜和负极片通过卷绕形成的卷绕式结构,也可以是由正极片、隔离膜和负极片通过层叠布置形成的叠片式结构。电极组件2具有第一极耳21和第二极耳22,第一极耳21和第二极耳22中的一者为正极耳,另一者为负极耳。正极耳可以是正极片上未涂覆正极活性物质层的部分,负极耳可以是负极片上未涂覆负极活性物质层的部分。
端盖3是封闭壳体1的开口以将电池单体10的内部环境与外部环境隔绝的部件。端盖3与壳体1共同限定出用于容纳电极组件2、电解液以及其他部件的密封空间。端盖3的形状可以与壳体1的形状相适配,比如,壳体1为长方体结构,端盖3为与壳体1相适配的矩形结构,再如,如图3和图4,壳体1为圆柱体结构,端盖3为与壳体1相适配的圆形结构。端盖3的材质也可以是多种,比如,铜、铁、铝、钢、铝合金等,端盖3的材质与壳体1的材质可以相同,也可以不同。
电池单体10还可以包括电极端子4,电极端子4用于与电极组件2电连接,以输出电池单体10的电能。电极端子4可以安装于壳体1,也可以安装于端盖3。在图3和图4所示的实施例中,电极端子4设置于壳体1与端盖3相对的壁部11,端盖3与第一极耳21电连接,电极端子4与第二极耳22电连接。
当然,端盖3与第一极耳21可以直接连接,也可以间接连接,电极端子4与第二极耳22可以直接连接,也可以间接连接。示例性的,端盖3与第一极耳21通过一集流构件5间接连接,电极端子4与第二极耳22通过另一集流构件5间接连接。集流构件5为金属导体,比如,铜、铁、铝、钢、铝合金等,集流构件5可以是圆盘状。
请参照图5和图6,图5为图4所示的端盖3的轴测图;图6为图5所示的端盖3的俯视图。本申请实施例提供一种端盖3,用于电池单体10,包括盖本体31和加强部32。盖本体31用于封闭电池单体10的壳体1的开口,沿盖本体31的厚度方向Z,盖本体31具有第一表面311。加强部32凸出于第一表面311,加强部32用于加强盖本体31。
盖本体31为端盖3的主体部分,盖本体31能够将壳体1的开口封闭。盖本体31的形状可以是多种,比如,圆形、矩形等。第一表面311可以是盖本体31沿厚度方向Z面向壳体1的表面,也可以是盖本体31沿厚度方向Z背离壳体1的表面。第一表面311可以是盖本体31沿厚度方向Z最靠近壳体1的表面,也可以是盖本体31沿厚度方向Z最远离壳体1的表面,也可以是盖本体31位于盖本体31沿厚度方向Z最靠近壳体1的表面与最远离壳体1的表面之间的表面。以盖本体31为平板结构为例,盖本体31在厚度方向Z具有相对的内表面和外表面,内表面沿厚度方向Z面向壳体1,第一表面311可以是盖本体31的内表面,也可以是外表面。
加强部32为端盖3凸出于第一表面311且对盖本体31起到加强作用的部分,加强部32能够提高盖本体31的刚度,增强盖本体31的抗变形能力,从而提升了整个端盖3的抗变形能力。加强部32可以是多种形状,比如,直线形、圆弧形、圆环形、U形、圆形、矩形等。加强部32与盖本体31可以一体成型,比如,通过冲压的方式在端盖3上形成加强部32,使得加强部32与盖本体31一体成型;加强部32与盖本体31也可以分体设置并连接,比如焊接。
在本申请实施例中,盖本体31在厚度方向Z上的第一表面311设置有加强部32,加强部32对盖本体31起到加强作用,提高了端盖3的抗变形能力,提高了端盖3的抗疲劳性能,降低端盖3因疲劳而被破坏的风险,使得端盖3具有更长的使用寿命,进而提高了电池单体10的使用寿命。
发明人注意到,在一般的电池100中,电池单体10可以通过胶层固定于外部部件,胶层连接外部部件和端盖3。外部部件可以是箱体20的底壁327、热管理部件等,热管理部件为箱体20内管理电池单体10的温度的部件,热管理部件可以是水冷板。电池单体10内部产生气体后,可能导致电池单体10膨胀,造成端盖3发生变形。端盖3发生变形后,可能会导致端盖3与胶层脱离。然而,在本申请实施例中,加强部32的设置提高了端盖3的抗变形能力,降低了端盖3与胶层脱离的风险。
在一些实施例中,请继续参照图5和图6,加强部32包括凸出于第一表面311的第一圆弧部321和第二圆弧部322,第一圆弧部321的开口与第二圆弧部322的开口背对设置。
第一圆弧部321和第二圆弧部322均为圆弧形,且两者均凸出于第一表面311。第一圆弧部321的圆心角可以是小于360°的任意角度,比如,锐角、直角、钝角等。第二圆弧部322的圆心角可以是小于360°的任意角度,比如,锐角、直角、钝角等。第一圆弧部321在延伸方向具有两端,第一圆弧部321的两端的连线(直线)位置形成第一圆弧部321的开口。第二圆弧部322在延伸方向具有相对的两端,第二圆弧部322的两端的连线(直线)位置形成第二圆弧部322的开口。第一圆弧部321具有背离第二圆弧部322的第一圆弧面3210,第一圆弧面3210延伸至第一圆弧部321的两端;第二圆弧部322具有背离第一圆弧部321的第二圆弧面3220,第二圆弧面3220延伸至第二圆弧部322的两端。第一圆弧部321的开口与第二圆弧部322的开口背对设置,即第一圆弧面3210与第二圆弧面3220背对设置。
第一圆弧部321与第二圆弧部322可以直接相连;第一圆弧部321与第二圆弧部322也可以间隔设置,比如,第一圆弧部321与第二圆弧部322沿盖本体31的径向间隔设置。
在本实施例中,第一圆弧部321和第二圆弧部322均为圆弧形,且两者的开口背对设置,这种结构的加强部32辐射范围更大,能够增大对盖本体31的加强范围,圆弧形的第一圆弧部321和第二圆弧部322自身具有更好的抗变形能力,在受到沿厚度方向Z的作用力时不易发生变形,能够对盖本体31起到更好的加强效果,进一步提高了端盖3的抗变形能力和抗疲劳性能。
在一些实施例中,请参照图6和图7,图7为图6所示的加强部32的结构示意图。第一圆弧部321与第二圆弧部322相连形成连接区323,连接区323具有相对的第一端3231和第二端3232,第一圆弧部321包括第一圆弧段3211和第二圆弧段3212,第二圆弧部322包括第三圆弧段3221和第四圆弧段3222,第一圆弧段3211和第三圆弧段3221连接于第一端3231,第二圆弧段3212和第四圆弧段3222连接于第二端3232。沿第二端3232指向第一端3231的方向,第一圆弧段3211与第三圆弧段3221的间距逐渐增大。沿第一端3231指向第二端3232的方向,第二圆弧段3212与第四圆弧段3222的间距逐渐增大。
连接区323为第一圆弧部321和第二圆弧部322的共有部分。在盖本体31为圆形的实施例中,第一端3231和第二端3232可以是连接区323沿盖本体31的径向相对的两端。第一圆弧段3211和第二圆弧段3212为第一圆弧部321分别位于连接区323的第一端3231和第二端3232的圆弧部分。第一圆弧段3211的弧长和第二圆弧段3212的弧长可以相等,也可以不等。第一圆弧部321的第一圆弧面3210的一部分位于第一圆弧部321,另一部分 位于第二圆弧部322,其余部分位于连接区323。第三圆弧段3221和第四圆弧段3222为第二圆弧部322分别位于连接区323的第一端3231和第二端3232的圆弧部分。第三圆弧段3221的弧长和第四圆弧段3222的弧长可以相等,也可以不等。第二圆弧部322的第二圆弧面3220的一部分位于第三圆弧部,另一部分位于第四圆弧部,其余部分位于连接区323。示例性的,在图7所示的实施例中,第一圆弧段3211的弧长与第二圆弧部322的弧长相等,第三圆弧段3221的弧长与第四圆弧段3222的弧长相等。
第一圆弧段3211具有面向第三圆弧段3221的第一侧面3211a,第三圆弧段3221具有面向第一圆弧段3211的第三侧面3221a。第一圆弧段3211与第三圆弧段3221的间距是指第一侧面3211a与第三侧面3221a之间在第一方向X上的距离。第二圆弧段3212具有面向第四圆弧段3222的第二侧面3212a,第四圆弧段3222具有面向第二圆弧段3212的第四侧面3222a。第二圆弧段3212与第四圆弧段3222的间距是指第二侧面3212a与第四侧面3222a之间在第一方向X上的距离。其中,第一方向X垂直于第一端3231指向第二端3232的方向。
在本实施例中,第一圆弧部321与第二圆弧部322相连形成连接区323,连接区323能够对盖本体31起到很好的加强作用。沿第二端3232指向第一端3231的方向,第一圆弧段3211与第三圆弧段3221的间距逐渐增大,使得第一圆弧段3211和第三圆弧段3221的加强范围逐渐增大,且圆弧形的第一圆弧段3211和第三圆弧段3221自身具有很好的抗变形能力,进一步提高了加强部32对盖本体31的加强效果。沿第一端3231指向第二端3232的方向,第二圆弧段3212与第四圆弧段3222的间距逐渐增大,使得第二圆弧段3212和第四圆弧段3222的加强范围逐渐增大,且圆弧形的第二圆弧段3212和第四圆弧段3222自身具有很好的抗变形能力,进一步提高了加强部32对盖本体31的加强效果。
在一些实施例中,请继续参照图7,沿连接区323的中间位置O到第一端3231和第二端3232的方向,连接区323的宽度逐渐增大。
连接区323的中间位置O为连接区323对应第一端3231与第二端3232的连线(直线)的中点位置,连接区323的中间位置O可以是连接区323的几何中心。连接区323的宽度为连接区323在第一方向X上的尺寸。连接区323在中间位置O的宽度最小。示例性的,连接区323在中间位置O的宽度小于第一圆弧段3211、第二圆弧段3212、第三圆弧段3221和第四圆弧段3222中的任意一者的宽度的两倍。
在本实施例中,连接区323从中间位置O到两端的加强能力逐渐增强,连接区323自身具有很好的抗变形能力,增强了连接区323对盖本体31的加强效果。此外,由于连接区323宽度从中间位置O到两端逐渐增大,且第一圆弧段3211与第三圆弧段3221之间的距离沿第二端3232指向第一端3231的方向逐渐增大,第二圆弧段3212与第四圆弧段3222之间的距离沿第一端3231指向第二端3232的方向逐渐增大,使得加强部32的宽度从中间到两端逐渐增大,加强部32对盖本体31起到更好的加强效果。
在一些实施例中,盖本体31为圆形,盖本体31的中心线经过连接区323的中间位置O。
可理解的,盖本体31的中心线经过第一端3231与第二端3232的连线的中点。盖本体31的中心线可以是第一端3231与第二端3232的连线(直线)的中垂线。
在电池单体10的内部压力发生变化时,盖本体31的中心区域最容易发生变形,盖本体31的中心轴线经过连接区323的中间位置O,使得加强部32能够对盖本体31的中心区域进行加强,从而降低端盖3因疲劳而被破坏的风险。
在一些实施例中,请继续参照图7,第一圆弧段3211具有面向第三圆弧段3221的第一侧面3211a,第三圆弧段3221具有面向第一圆弧段3211的第三侧面3221a,第一侧面3211a与第三侧面3221a通过第一圆角面324连接;和/或,第二圆弧段3212具有面向第四圆弧段3222的第二侧面3212a,第四圆弧段3222具有面向第二圆弧段3212的第四侧面3222a,第二侧面3212a与第四侧面3222a通过第二圆角面325连接。
第一侧面3211a、第二侧面3212a、第三侧面3221a和第四侧面3222a为圆弧面,第一侧面3211a和第二侧面3212a均可以与第一圆弧面3210同心设置,第三侧面3221a和第四侧面3222a均可以与第二圆弧面3220同心设置。第一圆角面324为连接第一侧面3211a和第三侧面3221a的圆弧面,第一侧面3211a和第三侧面3221a均可以与第一圆角面324相切。第二圆角面325为连接第二侧面3212a和第四侧面3222a的圆弧面,第二侧面3212a和第四侧面3222a均可以与第二圆角面325相切。
第一侧面3211a与第三侧面3221a通过第一圆角面324连接,降低第一圆弧段3211与第三圆弧段3221连接位置出现应力集中的风险;第二侧面3212a与第四侧面3222a通过第二圆角面325连接,降低第二圆弧段3212与第四圆弧段3222连接位置出现应急集中的风险。
在一些实施例中,请继续参照图7,第一圆弧段3211与第三圆弧段3221对称设置;和/或,第二圆弧段3212与第四圆弧段3222对称设置;和/或,第一圆弧段3211与第二圆弧段3212对称设置;和/或,第三圆弧段3221与第四圆弧段3222对称设置。
如图7所示,第一圆弧段3211与第三圆弧段3221可以关于第一参考面F对称设置,第二圆弧段3212与第四圆弧段3222也可以关于第一参考面F对称设置,连接区323可以是关于第一参考面F对称的对称结构。第一圆弧段3211与第二圆弧段3212可以关于第二参考面G对称设置,第三圆弧段3221与第四圆弧段3222也可以关于 第二参考面G对称设置,连接区323也可以是关于第二参考面G对称的对称结构,第二参考面G可以垂直于第一参考面F。
第一圆弧段3211和第三圆弧段3221对称设置,在盖本体31受到作用力时,第一圆弧段3211和第三圆弧段3221受力基本一致,第一圆弧段3211和第三圆弧段3221抵抗盖本体31发生变形的能力基本一致,第一圆弧段3211和第三圆弧段3221均能够对盖本体31起到很好的加强作用。第二圆弧段3212和第四圆弧段3222对称设置,在盖本体31受到作用力时,第二圆弧段3212和第四圆弧段3222受力基本一致,第二圆弧段3212和第四圆弧段3222抵抗盖本体31发生变形的能力基本一致,第二圆弧段3212和第四圆弧段3222均能够对盖本体31起到很好的加强作用。第一圆弧段3211和第二圆弧段3212对称设置,在盖本体31受到作用力时,第一圆弧段3211和第二圆弧段3212受力基本一致,第一圆弧段3211和第二圆弧段3212抵抗盖本体31发生变形的能力基本一致,第一圆弧段3211和第二圆弧段3212均能够对盖本体31起到很好的加强作用。第三圆弧段3221和第四圆弧段3222对称设置,在盖本体31受到作用力时,第三圆弧段3221和第四圆弧段3222受力基本一致,第三圆弧段3221和第四圆弧段3222抵抗盖本体31发生变形的能力基本一致,第三圆弧段3221和第四圆弧段3222均能够对盖本体31起到很好的加强作用。
在一些实施例中,请继续参照图7,第一圆弧部321的圆心角为θ 1,满足:θ 1>90°;和/或,第二圆弧部322的圆心角为θ 2,满足:θ 2>90°。
在图7中,在第一圆弧部321的延伸方向上,第一圆弧部321的一端和第一圆弧面3210所在圆的圆心相连形成第一连线I,第一圆弧部321的另一端和第一圆弧面3210所在圆的圆心相连形成第二连线K,第一连线I与第二连线K之间的角度即为第一圆弧部321的圆心角θ 1。在第二圆弧部322的延伸方向上,第二圆弧部322的一端和第二圆弧面3220所在圆的圆心相连形成第三连线M,第二圆弧部322的另一端和第二圆弧面3220所在圆的圆心相连形成第四连线N,第三连线M与第四连线N之间的角度即为第二圆弧部322的圆心角θ 1
θ 1可以是大于90°的多个角度,比如,100°135°180°225°270°等。θ 2可以是大于90°的多个角度,比如,100°135°180°225°270°等。θ 1与θ 2可以相等,也可以不等。在图7所示的实施例中,θ 1=θ 2
在本实施例中,θ 1>90°增大了第一圆弧部321对盖本体31的加强范围;θ 2>90°增大了第二圆弧部322对盖本体31的加强范围。
在一些实施例中,加强部32与盖本体31一体成型。
加强部32与盖本体31可以通过多种成型方式一体成型,比如,浇注成型、冲压成型等。
在本实施例中,加强部32与盖本体31一体成型,能够增强加强部32与盖本体31的连接强度,提高端盖3的长期可靠性。
在一些实施例中,请参照图8和图9,图8为图6所示的端盖3的A-A剖视图;图9为图8所示的端盖3的仰视图。沿厚度方向Z,盖本体31具有与第一表面311相对的第二表面312,盖本体31设置有第一凹部313,第一凹部313从第二表面312沿靠近第一表面311的方向凹陷,并在盖本体31与第一凹部313相对应的位置形成凸出于第一表面311的加强部32。
第二表面312为盖本体31与第一表面311相对的表面,第二表面312与第一表面311之间的距离可以是盖本体31的厚度。第二凹部3163的形状与加强部32的形状相同。
在成型时,可以通过冲压的方式在第二表面312上成型出第一凹部313,进而形成凸出于第一表面311的加强部32,加强部32的成型方式简单。第一凹部313的设置使得盖本体31在设置加强部32的位置形成凹陷结构,使得加强部32具有更好的抗变形能力,提高了加强部32对盖本体31的加强效果。
在一些实施例中,请继续参照图8,沿厚度方向Z,加强部32凸出第一表面311的高度为H,第一表面311与第二表面312的距离为D,满足:0.04mm 2≤D*H≤0.81mm 2
D*H可以是0.04mm 2~0.81mm 2之间的多个值,比如,0.04mm 2、0.06mm 2、0.1mm 2、0.2mm 2、0.3mm 2、0.4mm 2、0.5mm 2、0.6mm 2、0.64mm 2、0.7mm 2、0.81mm 2等。
当D*H<0.04mm 2时,D和H中的至少一者的厚度过小,端盖3的抗变形能力较差,端盖3容易发生变形。当D*H>0.81mm 2时,D和H中的至少一者的厚度过大,端盖3占用空间较大。因此,0.04mm 2≤D*H≤0.81mm 2,一方面,能够提高端盖3的抗变形能力,另一方面,能够使得端盖3不会占用较大的空间。
在一些实施例中,0.06mm 2≤D*H≤0.64mm 2
在本实施例中,D*H可以是0.06mm 2~0.64mm 2之间的多个值,比如,0.06mm 2、0.1mm 2、0.15mm 2、0.2mm 2、0.25mm 2、0.3mm 2、0.35mm 2、0.4mm 2、0.45mm 2、0.5mm 2、0.55mm 2、0.6mm 2、0.64mm 2等。
在本实施例中,0.06mm 2≤D*H≤0.64mm 2,一方面,能够进一步提高端盖3的抗变形能力,另一方面,进一步减小端盖3占用的空间。此外,当D*H>0.64mm 2时,在采用冲压成型的方式成型加强部32时,加强部32的拉伸量过大,导致加强部32的强度变弱。因此,D*H≤0.64mm 2,能够提高加强部32的强度。
在一些实施例中,0.25mm≤H≤0.8mm;和/或,0.25mm≤D≤0.8mm。
H可以是0.25mm~0.8mm之间的多个值,比如,0.25mm、0.3mm、0.35mm、0.4mm、0.45mm、0.5mm、0.55mm、0.6mm、0.65mm、0.7mm、0.75mm、0.8mm等。D可以是0.25mm~0.8mm之间的多个值,比如,0.25mm、0.3mm、0.35mm、0.4mm、0.45mm、0.5mm、0.55mm、0.6mm、0.65mm、0.7mm、0.75mm、0.8mm等。
当H<0.25mm时,加强部32凸出于第一表面311的高度较小,加强部32对盖本体31的加强作用较小。当H>0.8mm时,加强部32凸出于第一表面311的高度较大,加强部32占用较大空间。因此,0.25mm≤H≤0.8mm,第一方面,能够提高加强部32对盖本体31的加强效果,另一方面,能够减小加强部32占用的空间。当D<0.25mm时,第一表面311与第二表面312的距离较小,盖本体31的抗变形能力较差,盖本体31的强度也较差。当D>0.8mm时,盖本体31的厚度较大,盖本体31占用较大空间。因此,0.25mm≤H≤0.8mm,第一方面,能够提高盖本体31的抗变形能力和盖本体31的强度,另一方面,能够减小盖本体31占用的空间。
在一些实施例中,请参照图10,图10为图8所示的端盖3的B处的局部放大图。加强部32具有侧壁326和底壁327,侧壁326围设于底壁327的周围,侧壁326与底壁327共同限定出第一凹部313,侧壁326的最大厚度为L 1,底壁327的最大厚度为L 2。沿厚度方向Z,第一表面311与第二表面312的距离为D,满足:L 1≤D,L 2≤D。
底壁327为加强部32沿厚度方向Z设置的壁,沿厚度方向Z,底壁327与第一凹部313的开口相对设置。侧壁326为加强部32围设于底壁327的周围的部分,侧壁326的延伸轨迹与第一凹部313的形状相同。侧壁326的厚度可以是均匀的,也可以是非均匀的。若侧壁326的厚度为均匀的,侧壁326的最大厚度等于侧壁326的最小厚度。底壁327的厚度可以是均匀的,也可以是非均匀的,若底壁327的厚度是均匀的,底壁327的最大厚度等于底壁327的最小厚度。
在图10所示的实施例中,侧壁326的厚度是非均匀的,沿第一凹部313的深度方向,侧壁326的厚度逐渐减小;底壁327的厚度也是非均匀的,沿厚度沿第一凹部313的宽度方向,底壁327的厚度从中间向两端逐渐增大。
L 1和L 2均不大于D,使得侧壁326的最大厚度和底壁327的最大厚度均不会超过第一表面311与第二表面312之间的距离,可以简化成型工艺,可以通过冲压的方式成型加强部32,成型方式简单。
在一些实施例中,底壁327的最小厚度为L 3,侧壁326的最小厚度为L 4,满足:D-L 3≤0.2mm;和/或,D-L 4≤0.2mm。
D-L 3可以是0~0.2mm的多个数值,比如,0.01mm、0.04mm、0.08mm、0.1mm、0.12mm、0.16mm、0.2mm等。D-L 4可以是0~0.2mm的多个数值,比如,0.01mm、0.04mm、0.08mm、0.1mm、0.12mm、0.16mm、0.2mm等。
若D-L 3>0.2mm,底壁327的最小厚度较小,而底壁327的强度较差,底壁327容易被破坏。因此,D-L 3≤0.2mm能够保证底壁327具有足够的强度;若D-L 4>0.2mm,侧壁326的最小厚度较小,而侧壁326的强度较差,侧壁326容易被破坏。因此,D-L 4≤0.2mm能够保证侧壁326具有足够的强度。
在一些实施例中,请继续参照图5、图6和图8,盖本体31具有泄压区314,第一表面311至少部分位于泄压区314,盖本体31设置有刻痕槽315,刻痕槽315沿泄压区314的边缘设置,泄压区314被配置为在电池单体10泄压时以刻痕槽315为边界打开。其中,加强部32设置于泄压区314。
泄压区314为盖本体31在电池单体10泄压时能够以刻痕槽315为边界打开的部分。泄压区314打开后,盖本体31在对应泄压区314的位置可以形成排放口,电池单体10内部的排放物能够通过排放口排出,以泄放电池单体10内部的压力。第一表面311可以完全位于泄压区314,也可以局部位于泄压区314。
盖本体31在设置刻痕槽315的位置的残留部分为薄弱部,薄弱部的强度小于盖本体31其他区域的强度,使得盖本体31在设置刻痕槽315的位置更为薄弱,更容易被破坏。在电池单体10内部的压力达到起爆压力时,薄弱部将在电池单体10内部的排放物(电解液、气体等)的作用下被破坏,使得泄压区314向外打开。泄压区314可以以向外翻转或脱离的方式打开。刻痕槽315可以设置于第一表面311,也可以设置于第二表面312。刻痕槽315可以是多种形状,比如,圆环形、圆弧形、U形、H形等。刻痕槽315可以通过多种方式成型,比如,冲压成型、铣削加工成型等。
泄压区314的设置使得端盖3具有泄压功能,泄压区314能够以刻痕槽315为边界打开,具有较大的泄压面积。加强部32设置于泄压区314,加强部32对泄压区314起到加强作用,提高泄压区314的抗变形能力,在电池单体10内部压力发生变化时,泄压区314不易发生变形,降低泄压区314在电池单体10正常使用过程中打开的风险。
在一些实施例中,刻痕槽315为沿封闭轨迹延伸的槽。
封闭轨迹可以是多种形状,比如,圆形轨迹、矩形轨迹、椭圆形轨迹等。
在电池单体10泄压时,泄压区314可以以向电池单体10外部脱离的方式打开,使得电池单体10具有较 大的泄压面积,提高了泄压效率。
在一些实施例中,刻痕槽315为圆环形。
可理解的,刻痕槽315为沿圆形轨迹延伸的槽。圆环形的刻痕槽315结构简单,成型方便。
在一些实施例中,盖本体31为圆形,刻痕槽315与盖本体31同轴设置。
盖本体31为圆形结构,可理解的,盖本体31的外边缘为圆形,这种结构的端盖3为圆形端盖。刻痕槽315与盖本体31同轴设置,即刻痕槽315的中心线与盖本体31的中心线重合。
在本实施例中,刻痕槽315与盖本体31同轴设置,由刻痕槽315限定的泄压区314位于盖本体31的中心区域,有利于泄压区314及时打开泄压。
在一些实施例中,第一表面311面向壳体1的内部,刻痕槽315设置于第一表面311。
端盖3封闭壳体1的开口后,第一表面311将面向壳体1的内部。由于刻痕槽315设置于第一表面311,第一表面311面向壳体1的内部,使得刻痕槽315面向电池单体10的内部,刻痕槽315并未暴露于电池单体10的外部,降低盖本体31设置刻痕槽315的位置因暴露于电池单体10的外部而被氧化的风险。由于加强部32设置于第一表面311,第一表面311面向壳体1的内部,加强部32可以利用电池单体10的内部空间,加强部32不会占用电池单体10的外部的空间。
在一些实施例中,请继续参照图6,加强部32包括凸出于第一表面311的第一圆弧部321和第二圆弧部322,第一圆弧部321的开口与第二圆弧部322的开口背对设置。第一圆弧部321在其延伸方向上的端部与刻痕槽315的最小间距为S 1,满足:S 1>0.5mm;和/或,第二圆弧部322在其延伸方向上的端部与刻痕槽315的最小间距为S 2,满足:S 2>0.5mm。
S 1可以是大于0.5mm的多个数值,比如0.6mm、0.7mm、0.8mm、0.9mm、1mm等。S 2可以是大于0.5mm的多个数值,比如0.6mm、0.7mm、0.8mm、0.9mm、1mm等。S 1与S 2可以相等,也可以不等。
在图6所示的实施例中,第一圆弧部321在其延伸方向上具有两端部,一端部为第一圆弧段3211远离连接区323的一端,另一端部为第二圆弧段3212远离连接区323的一端。第一圆弧段3211远离连接区323的一端与刻痕槽315的最小距离以及第二圆弧段3212远离连接区323的一端与刻痕槽315的最小距离均为S 1。第二圆弧部322在其延伸方向上具有两端部,一端部为第三圆弧段3221远离连接区323的一端,另一端部为第四圆弧段3222远离连接区323的一端。第三圆弧段3221远离连接区323的一端与刻痕槽315的最小距离以及第四圆弧段3222远离连接区323的一端与刻痕槽315的最小距离均为S 2
S 1>0.5mm,降低第一圆弧部321对刻痕槽315的影响,降低因第一圆弧部321的端部与刻痕槽315过近而对刻痕槽315造成挤压的风险。S 2>0.5mm,降低第二圆弧部322对刻痕槽315的影响,降低因第二圆弧部322的端部与刻痕槽315过近而对刻痕槽315造成挤压的风险。
在一些实施例中,请继续参照图8和图11,图11为4所示的电池单体10的C处的局部放大图。盖本体31包括本体部316和连接部317,本体部316具有第一表面311,连接部317环绕设置于本体部316的外边缘,在厚度方向Z上,连接部317沿面向壳体1的内部的方向凸出于本体部316,连接部317用于延伸至壳体1内,并与壳体1形成定位配合。
连接部317为盖本体31用于与壳体1形成定位配合的部分,本体部316为盖本体31位于连接部317的内侧的部分。在端盖3为圆形的实施例中,本体部316可以是位于盖本体31的中心区域的圆形区域,连接部317可以是环绕在本体部316的外侧的环形区域。连接部317与本体部316可以是一体成型结构。加强部32设置于本体部316,加强部32能够对本体部316起到加强作用。
端盖3与壳体1装配后,连接部317的外周面与壳体1内周面接触,实现连接部317与壳体1定位配合。连接部317的外周面与壳体1的内周面均沿厚度方向Z延伸。示例性的,连接部317的外周面和壳体1的内周面均为沿厚度方向Z延伸的圆柱面。
在端盖3与电极组件2的第一极耳21电连接的实施例中,连接部317可以是端盖3用于与第一极耳21电连接的部分。在一些实施例中,连接部317直接与第一极耳21连接,比如,连接部317焊接于极耳;在另一些实施例中,如图11所示,连接部317与第一极耳21通过集流构件5间接连接,比如,集流构件5与第一极耳21焊接,连接部317与集流构件5焊接。
在本实施例中,连接部317沿面向壳体1的内部的方向凸出于本体部316,连接部317能够与壳体1形成定位配合,能够提高端盖3与壳体1的装配效率。
在一些实施例中,请继续参照图8和图11,沿厚度方向Z,连接部317具有面向壳体1的内部的第三表面3171,第一表面311面向壳体1的内部,加强部32沿面向壳体1内部的方向不超出第三表面3171。
第三表面3171为连接部317沿厚度方向Z面向壳体1的内部的内表面,第三表面3171可以是圆环面。 在连接部317直接与第一极耳21连接的实施例中,第三表面3171抵靠于第一极耳21;如图11所示,在连接部317通过集流构件5与第一极耳21连接的实施例中,第三表面3171抵靠于集流构件5。
沿厚度方向Z,加强部32面向壳体1内部的表面可以与第三表面3171平齐,也可以相较于第三表面3171更远离位于壳体1内的电极组件2,实现加强部32沿面向壳体1内部的方向不超出第三表面3171。
在本实施例中,加强部32沿面向壳体1内部的方向不超出第三表面3171,在连接部317的第三表面3171与电池单体10的内部的部件(如,第一极耳21或集流构件5等)抵靠时,加强部32不易与电池单体10的内部的部件发生干涉。
在一些实施例中,沿厚度方向Z,本体部316具有相对的第四表面3161和第五表面3162,连接部317凸出于第四表面3161。本体部316具有泄压区314,本体部316设置有刻痕槽315和第二凹部3163,刻痕槽315沿泄压区314的边缘设置,泄压区314被配置为在电池单体10泄压时以刻痕槽315为边界打开,第二凹部3163从第五表面3162沿靠近第四表面3161的方向凹陷。其中,第二凹部3163的底面沿厚度方向Z的投影覆盖刻痕槽315。
第四表面3161面向壳体1的内部,第四表面3161与第一表面311可以是本体部316的同一表面;在图8所示的实施例中,第四表面3161与第一表面311也可以是在厚度方向Z存在距离的两个表面。第五表面3162为本体部316沿厚度方向Z背离壳体1的表面,第五表面3162可以是环绕于第二凹部3163的外侧的圆环面。
连接部317从第四表面3161沿靠近壳体1内部的方向凸出。第二凹部3163可以是圆柱体槽、长方体槽等。刻痕槽315可以设置于第一表面311,也可以设置于第二凹部3163的底面。在图8所示的实施例中,刻痕槽315设置于第一表面311。
第二凹部3163的设置使得泄压区314与第五表面3162之间存在一定距离,在第五表面3162与外部部件接触时,能够降低外部部件对泄压区314的影响,使得泄压区314能够在电池单体10泄压时向外打开,降低泄压区314受到外部部件的阻碍作用,而造成泄压区314无法正常打开的风险。其中,外部部件可以是箱体20的底壁327、热管理部件等。
在一些实施例中,沿厚度方向Z,第五表面3162为端盖3最远离壳体1的表面。
第五表面3162为端盖3沿厚度方向Z最远离壳体1的表面,也是电池单体10沿厚度方向Z最远离壳体1的表面。沿厚度方向Z,第五表面3162相较于连接部317更远离于壳体1。
第五表面3162可以作为电池单体10的支撑面,电池单体10放置于外部部件时,第五表面3162与外部部件接触,保证电池单体10放置于外部部件的稳定性。
在一些实施例中,本体部316与第二凹部3163相对应的位置形成凸出于第四表面3161的凸部3164,凸部3164背离第四表面3161的表面为第一表面311。
凸部3164的形状可以与第二凹部3163的形状相同。以第二凹部3163为圆柱体槽为例,凸部3164可以是凸出于第四表面3161的圆柱体凸台。可以通过冲压的方式在第五表面3162成型第二凹部3163,进而形成凸出于第四表面3161的凸部3164。
在本实施例中,凸部3164的设置能够增大本体部316设置第二凹部3163区域的强度。
在一些实施例中,沿所述厚度方向Z,第二凹部3163的底面与第一表面311相对设置。本体部316设置有第一凹部313,第一凹部313从第二凹部3163的底面沿靠近第一表面311的方向凹陷,并在本体部316与第一凹部313相对应的位置形成凸出于第一表面311的加强部32。
第二凹部3163的底面为盖本体31的第二表面312。沿厚度方向Z,第四表面3161与第五表面3162之间的距离可以等于第一表面311与第二表面312之间的距离。
在成型时,可以通过冲压的方式在第二凹部3163的底面上成型出第一凹部313,进而形成凸出于第一表面311的加强部32,加强部32的成型方式简单。第一凹部313的设置使得本体部316在设置加强部32的位置形成凹陷结构,使得加强部32具有更好的抗变形能力,提高了加强部32对本体部316的加强效果。
在一些实施例中,请继续参照图8和图11,盖本体31还包括边缘部318,边缘部318环绕设置于连接部317的外边缘,边缘部318用于连接壳体1设置开口的一端。
边缘部318为盖本体31与壳体1连接的部分,边缘部318与壳体1可以通过多种方式连接,比如,焊接、粘接等。边缘部318可以是环绕于连接部317的外侧的圆环结构。
沿厚度方向Z,边缘部318具有面向壳体1的台阶面3181,台阶面3181与连接部317的外周面相连,台阶面3181用于与壳体1设置开口的一端相抵,以使盖本体31封闭壳体1的开口。
在第五表面3162为端盖3沿厚度方向Z最远离壳体1的表面的实施例中,沿厚度方向Z,可以是第五表面3162相较于边缘部318更远离于壳体1,使得第五表面3162与边缘在厚度方向Z上存在高度差,以使边缘部318与壳体1焊接所产生的焊渣不易凸出于第五表面3162,保证第五表面3162的平整性,保证电池单体10在第五 表面3162作为支撑面时的稳定性。
在组装端盖3和壳体1时,连接部317与壳体1定位配合后,边缘部318可以抵靠于壳体1设置开口的一端,可方便地将边缘部318连接于壳体1设置开口的一端,比如,将边缘部318焊接于壳体1设置开口的一端。
在一些实施例中,端盖3的材料包括钢、不锈钢和镀镍钢中的至少一种。
端盖3的材料可以是钢,也可以是不锈钢,也可以是镀镍钢,也可以是钢、不锈钢和镀镍钢中的两种或三种。在端盖3为镀镍钢的实施例中,在端盖3设置刻痕槽315后,端盖3在设置刻痕槽315的位置的镍层可能会被破坏,端盖3在设置刻痕槽315的位置容易被氧化。在第一表面311面向壳体1的内部,刻痕槽315设置于第一表面311的实施例中,刻痕槽315并未暴露于电池单体10的外部,降低了端盖3设置刻痕槽315的位置被氧化的风险,能够有效提高端盖3的使用寿命。
在本实施例中,端盖3具有更好的强度和刚度,使用寿命更长。
本申请实施例一种电池单体10,包括壳体1和上述任意一个实施例提供的端盖3。壳体1具有开口,盖本体31封闭开口。
在一些实施例中,沿厚度方向Z,第一表面311面向壳体1的内部。
在其他实施例中,第一表面311也可以是盖本体31沿厚度方向Z背离壳体1的表面。
本申请实施例一种电池100,包括上述任意一个实施例提供的电池单体10。
本申请实施例提供一种用电设备,包括上述任意一个实施例提供的电池100。
请参照图5-图9,本申请实施例提供一种圆形端盖,端盖3用于封闭电池单体10的壳体1的开口。端盖3包括盖本体31和加强部32,加强部32设置于盖本体31。盖本体31包括本体部316、连接部317和边缘部318,连接部317环绕设置于本体部316的外边缘,边缘部318环绕设置于连接部317的外边缘,连接于用于延伸至壳体1内,并与壳体1形成定位配合,边缘部318用于连接壳体1设置开口的一端。沿盖本体31的厚度方向Z,本体部316具有相对的第四表面3161和第五表面3162,连接部317凸出于第四表面3161,第五表面3162为端盖3最远离壳体1的表面,连接部317和本体部316均相较于第五表面3162更靠近于壳体1。本体部316设置有刻痕槽315和第二凹部3163,第二凹部3163从第五表面3162沿靠近第四表面3161的方向凹陷,刻痕槽315为圆环形,刻痕槽315限定出泄压区314,泄压区314被配置为在电池单体10泄压时以刻痕槽315为边界打开,第二凹部3163的底面沿厚度方向Z的投影覆盖刻痕槽315。本体部316与第二凹部3163相对应的位置形成凸出于第四表面3161的凸部3164,凸部3164背离第四表面3161的表面为第一表面311,刻痕槽315设置于第一表面311,第二凹部3163的底面为第二表面312,第二表面312与第一表面311沿厚度方向Z相对设置。本体部316还设置有第一凹部313,第一凹部313从第二表面312沿靠近第一表面311的方向凹陷,并在本体部316与第一凹部313相对应的位置形成凸出于第一表面311的加强部32。
其中,加强部32包括设置于第一表面311的第一圆弧部321和第二圆弧部322,第一圆弧部321的开口与第二圆弧部322的开口背对设置。第一圆弧部321与第二圆弧部322相连形成连接区323,连接区323具有相对的第一端3231和第二端3232,第一圆弧部321包括第一圆弧段3211和第二圆弧段3212,第二圆弧部322包括第三圆弧段3221和第四圆弧段3222,第一圆弧段3211与第三圆弧段3221连接于第一端3231,第二圆弧段3212和第四圆弧段3222连接于第二端3232。沿第二端3232指向第一端3231的方向,第一圆弧段3211与第三圆弧段3221的间距逐渐增大。沿第一端3231指向第二端3232的方向,第二圆弧段3212与第四圆弧段3222的间距逐渐增大。沿连接区323的中间位置到第一端3231和第二端3232的方向,连接区323的宽度逐渐增大。第一圆弧段3211具有面向第三圆弧段3221的第一侧面3211a,第三圆弧段3221具有面向第一圆弧段3211的第三侧面3221a,第一侧面3211a与第三侧面3221a通过第一圆角面324连接;第二圆弧段3212具有面向第四圆弧段3222的第二侧面3212a,第四圆弧段3222具有面向第二圆弧段3212的第四侧面3222a,第二侧面3212a与第四侧面3222a通过第二圆角面325连接。第一圆弧段3211与第三圆弧段3221对称设置;第二圆弧段3212与第四圆弧段3222对称设置;第一圆弧段3211与所述第二圆弧段3212对称设置;第三圆弧段3221与第四圆弧段3222对称设置。第一圆弧部321的圆心角为θ 1,θ 1>90°;第二圆弧部322的圆心角为θ 2,θ 2>90°。
此外,加强部32凸出第一表面311的高度为H,第一表面311与第二表面312的距离为D,0.04mm 2≤D*H≤0.81mm 2。第一圆弧部321在其延伸方向上的端部与刻痕槽315的最小间距为S 1,S 1>0.5mm;第二圆弧部322在其延伸方向上的端部与刻痕槽315的最小间距为S 2,S 2>0.5mm。
需要说明的是,在不冲突的情况下,本申请中的实施例及实施例中的特征可以相互组合。
以上实施例仅用以说明本申请的技术方案,并不用于限制本申请,对于本领域的技术人员来说,本申请可以有各种更改和变化。凡在本申请的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本申请的保护范围之内。

Claims (33)

  1. 一种端盖,用于电池单体,包括:
    盖本体,用于封闭所述电池单体的壳体的开口,沿所述盖本体的厚度方向,所述盖本体具有第一表面;
    加强部,凸出于所述第一表面,所述加强部用于加强所述盖本体。
  2. 根据权利要求1所述的端盖,其中,所述加强部包括凸出于所述第一表面的第一圆弧部和第二圆弧部,所述第一圆弧部的开口与所述第二圆弧部的开口背对设置。
  3. 根据权利要求2所述的端盖,其中,所述第一圆弧部与所述第二圆弧部相连形成连接区,所述连接区具有相对的第一端和第二端,所述第一圆弧部包括第一圆弧段和第二圆弧段,所述第二圆弧部包括第三圆弧段和第四圆弧段,所述第一圆弧段和所述第三圆弧段连接于所述第一端,所述第二圆弧段和所述第四圆弧段连接于所述第二端;
    沿所述第二端指向所述第一端的方向,所述第一圆弧段与所述第三圆弧段的间距逐渐增大;
    沿所述第一端指向所述第二端的方向,所述第二圆弧段与所述第四圆弧段的间距逐渐增大。
  4. 根据权利要求3所述的端盖,其中,沿所述连接区的中间位置到所述第一端和所述第二端的方向,所述连接区的宽度逐渐增大。
  5. 根据权利要求4所述的端盖,其中,所述盖本体为圆形,所述盖本体的中心线经过所述中间位置。
  6. 根据权利要求3-5任一项所述的端盖,其中,所述第一圆弧段具有面向所述第三圆弧段的第一侧面,所述第三圆弧段具有面向所述第一圆弧段的第三侧面,所述第一侧面与所述第三侧面通过第一圆角面连接;和/或
    所述第二圆弧段具有面向所述第四圆弧段的第二侧面,所述第四圆弧段具有面向所述第二圆弧段的第四侧面,所述第二侧面与所述第四侧面通过第二圆角面连接。
  7. 根据权利要求3-6任一项所述的端盖,其中,所述第一圆弧段与所述第三圆弧段对称设置;和/或,所述第二圆弧段与所述第四圆弧段对称设置;和/或,所述第一圆弧段与所述第二圆弧段对称设置;和/或,所述第三圆弧段与所述第四圆弧段对称设置。
  8. 根据权利要求2-7任一项所述的端盖,其中,所述第一圆弧部的圆心角为θ1,满足:θ1>90°;和/或,所述第二圆弧部的圆心角为θ2,满足:θ2>90°。
  9. 根据权利要求1-8任一项所述的端盖,其中,所述加强部与所述盖本体一体成型。
  10. 根据权利要求1-9任一项所述的端盖,其中,沿所述厚度方向,所述盖本体具有与所述第一表面相对的第二表面,所述盖本体设置有第一凹部,所述第一凹部从所述第二表面沿靠近第一表面的方向凹陷,并在所述盖本体与所述第一凹部相对应的位置形成凸出于所述第一表面的所述加强部。
  11. 根据权利要求10所述的端盖,其中,沿所述厚度方向,所述加强部凸出所述第一表面的高度为H,所述第一表面与所述第二表面的距离为D,满足:0.04mm2≤D*H≤0.81 mm2。
  12. 根据权利要求11所述的端盖,其中,0.06mm2≤D*H≤0.64 mm2。
  13. 根据权利要求11或12所述的端盖,其中,0.25mm≤H≤0.8mm;和/或,0.25mm≤D≤0.8mm。
  14. 根据权利要求10-13任一项所述的端盖,其中,所述加强部具有侧壁和底壁,所述侧壁围设于所述底壁的周围,所述侧壁与所述底壁共同限定出所述第一凹部,所述侧壁的最大厚度为L1,所述底壁的最大厚度为L2;
    沿所述厚度方向,所述第一表面与所述第二表面的距离为D,满足:L1≤D,L2≤D。
  15. 根据权利要求14所述的端盖,其中,所述底壁的最小厚度为L3,所述侧壁的最小厚度为L4,满足:D-L3≤0.2mm;和/或,D-L4≤0.2mm。
  16. 根据权利要求1-15任一项所述的端盖,其中,所述盖本体具有泄压区,所述第一表面至少部分位于所述泄压区,所述盖本体设置有刻痕槽,所述刻痕槽沿所述泄压区的边缘设置,所述泄压区被配置为在所述电池单体泄压时以所述刻痕槽为边界打开;
    其中,所述加强部设置于所述泄压区。
  17. 根据权利要求16所述的端盖,其中,所述刻痕槽为沿封闭轨迹延伸的槽。
  18. 根据权利要求16或17所述的端盖,其中,所述刻痕槽为圆环形。
  19. 根据权利要求18所述的端盖,其中,所述盖本体为圆形,所述刻痕槽与所述盖本体同轴设置。
  20. 根据权利要求16-19任一项所述的端盖,其中,所述第一表面面向所述壳体的内部,所述刻痕槽设置于所述第一表面。
  21. 根据权利要求16-20任一项所述的端盖,其中,所述加强部包括凸出于所述第一表面的第一圆弧部和第二圆弧部,所述第一圆弧部的开口与所述第二圆弧部的开口背对设置;
    所述第一圆弧部在其延伸方向上的端部与所述刻痕槽的最小间距为S1,满足:S1>0.5mm;和/或,所述第二圆弧部在其延伸方向上的端部与所述刻痕槽的最小间距为S2,满足:S2>0.5mm。
  22. 根据权利要求1-21任一项所述的端盖,其中,所述盖本体包括本体部和连接部,所述本体部具有所述第一表面,所述连接部环绕设置于本体部的外边缘,在所述厚度方向上,所述连接部沿面向所述壳体的内部的方向凸出于所述本体部,所述连接部用于延伸至所述壳体内,并与所述壳体形成定位配合。
  23. 根据权利要求22所述的端盖,其中,沿所述厚度方向,所述连接部具有面向所述壳体的内部的第三表面,所述第一表面面向所述壳体的内部,所述加强部沿面向所述壳体内部的方向不超出所述第三表面。
  24. 根据权利要求22或23所述的端盖,其中,沿所述厚度方向,所述本体部具有相对的第四表面和第五表面,所述连接部凸出于所述第四表面;
    所述本体部具有泄压区,所述本体部设置有刻痕槽和第二凹部,所述刻痕槽沿所述泄压区的边缘设置,所述泄压区被配置为在所述电池单体泄压时以所述刻痕槽为边界打开,所述第二凹部从所述第五表面沿靠近所述第四表面的方向凹陷;
    其中,所述第二凹部的底面沿所述厚度方向的投影覆盖所述刻痕槽。
  25. 根据权利要求24所述的端盖,其中,沿所述厚度方向,所述第五表面为端盖最远离壳体的表面。
  26. 根据权利要求24或25所述的端盖,其中,所述本体部与所述第二凹部相对应的位置形成凸出于所述第四表面的凸部,所述凸部背离所述第四表面的表面为所述第一表面。
  27. 根据权利要求24-26任一项所述的端盖,其中,沿所述厚度方向,所述第二凹部的底面与所述第一表面相对设置;
    所述本体部设置有第一凹部,所述第一凹部从所述第二凹部的底面沿靠近第一表面的方向凹陷,并在所述本体部与所述第一凹部相对应的位置形成凸出于所述第一表面的所述加强部。
  28. 根据权利要求22-27任一项所述的端盖,其中,所述盖本体还包括边缘部,所述边缘部环绕设置于连接部的外边缘,所述边缘部用于连接所述壳体设置所述开口的一端。
  29. 根据权利要求1-28任一项所述的端盖,其中,所述端盖的材料包括钢、不锈钢和镀镍钢中的至少一种。
  30. 一种电池单体,包括:
    壳体,具有开口;
    如权利要求1-29任一项所述的端盖,所述盖本体封闭所述开口。
  31. 根据权利要求30所述的电池单体,其中,沿所述厚度方向,所述第一表面面向所述壳体的内部。
  32. 一种电池,包括如权利要求29或30所述的电池单体。
  33. 一种用电设备,包括如权利要求32所述的电池。
PCT/CN2022/122809 2022-09-29 2022-09-29 端盖、电池单体、电池及用电设备 WO2024065457A1 (zh)

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Publication number Priority date Publication date Assignee Title
JP2001057179A (ja) * 1999-08-18 2001-02-27 Sony Corp 二次電池及びそのケース
CN215342751U (zh) * 2021-05-28 2021-12-28 广东微电新能源有限公司 一种电池
CN216085065U (zh) * 2021-09-30 2022-03-18 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置
CN216120620U (zh) * 2021-10-18 2022-03-22 厦门海辰新能源科技有限公司 顶盖组件及电池
CN216213727U (zh) * 2021-09-30 2022-04-05 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置
CN217485657U (zh) * 2022-04-29 2022-09-23 宁德时代新能源科技股份有限公司 顶盖组件、电池单体、电池及用电设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001057179A (ja) * 1999-08-18 2001-02-27 Sony Corp 二次電池及びそのケース
CN215342751U (zh) * 2021-05-28 2021-12-28 广东微电新能源有限公司 一种电池
CN216085065U (zh) * 2021-09-30 2022-03-18 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置
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