CN217823199U - Battery end cover assembly, battery monomer, battery and consumer - Google Patents

Abstract

The embodiment of the disclosure provides a battery end cover assembly, a battery monomer, a battery and electric equipment. A battery end cap assembly (13) comprising: an end cap (20) having a liquid injection hole (21) that penetrates in a first direction (z), the liquid injection hole (21) including; a first bore section (211) and a second bore section (212) divided along a first direction (z), a cross-sectional area of the first bore section (211) being larger than a cross-sectional area of the second bore section (212), a step surface (213) being provided between the first bore section (211) and the second bore section (212), the step surface (213) comprising a first inclined surface (213 a) inclined towards the second bore section (212) along the first direction (z).

Description

Battery end cover assembly, battery monomer, battery and consumer

Technical Field

The disclosure relates to the technical field of batteries, in particular to a battery end cover assembly, a battery monomer, a battery and electric equipment.

Background

The secondary battery, especially the lithium ion battery, has the advantages of high voltage, large specific energy, long cycle life, no pollution, wide working temperature range, small self-discharge and the like, is widely applied to portable electronic equipment and power equipment of large-scale new energy electric vehicles, and has great significance for solving the problems of human environmental pollution and energy crisis. With the widespread use of lithium ion batteries, the long-term sealing reliability of the batteries has become a concern of close attention of users.

SUMMERY OF THE UTILITY MODEL

In one aspect of the present disclosure, there is provided a battery end cap assembly comprising:

the end cover is provided with a liquid injection hole which penetrates along a first direction, and the liquid injection hole comprises; the first hole section and the second hole section are divided along the first direction, the cross-sectional area of the first hole section is larger than that of the second hole section, a step surface is arranged between the first hole section and the second hole section, and the step surface comprises a first inclined surface which is inclined towards the second hole section along the first direction.

In the embodiment, the step surface in the liquid injection hole is provided with the first inclined surface, so that the electrolyte entering the liquid injection hole during liquid injection can be guided to flow downwards through the first inclined surface, and the residue of the electrolyte in the liquid injection hole is reduced or eliminated.

In some embodiments, the first inclined surface is a circular table.

The first inclined surface in the shape of the truncated cone can guide the electrolyte within a range of 360 degrees, and the residue of the electrolyte in the liquid injection hole is further reduced.

In some embodiments, the height of the first inclined surface in the first direction is L, the projection of the first inclined surface on a plane perpendicular to the first direction is a circular ring, the radial width of the circular ring is D, and the height L and the radial width D satisfy: D/L is more than or equal to 0.2 and less than or equal to 35.

The magnitude of the radial width D affects the proportion of the first inclined surface relative to the step surface to affect the effect of directing the flow of electrolyte, and the height L, in addition to affecting the proportion of the first inclined surface relative to the length of the second bore section to affect the sealing effect of the second bore section, can also affect the degree of inclination of the first inclined surface in conjunction with the radial width D to affect the directing effect of the flow of electrolyte.

In some embodiments, the height L and the radial width D satisfy: D/L is more than or equal to 0.5 and less than or equal to 3.5.

Through setting up the suitable ratio of radial width D and height L, can compromise the sealed effect of the effect that electrolyte flows and second hole section.

In some embodiments, the step surface further comprises: a planar section perpendicular to the first direction, the planar section located outside of the first inclined surface away from the second bore section.

The plane section can be used for being closely matched with the flat end face of the liquid injection port of the liquid injection equipment during liquid injection, so that air leakage is avoided during liquid injection under negative pressure.

In some embodiments, an area of a region defined by the inner edge of the planar section is configured to be larger than an area of a liquid outlet of a liquid injection nozzle, the liquid injection nozzle being a liquid injection nozzle of a liquid injection device for injecting liquid into the liquid injection hole.

Through making so that annotate the liquid outlet of liquid mouth and be located first inclined surface when annotating the liquid, avoid electrolyte to remain in the plane section to further prevent electrolyte in annotating the downthehole residue of liquid.

In some embodiments, the cell end cap assembly further comprises:

a first sealing pin at least partially disposed within the second bore section and in sealing engagement with the second bore section.

Through at least part at the second hole section that sets up first sealed nail to make first sealed nail and the sealed cooperation of second hole section, make notes liquid hole after annotating the liquid realize sealed through first sealed nail, prevent that electrolyte from outwards leaking through annotating the liquid hole, thereby improve the safety in utilization of battery.

In some embodiments, the first sealing spike comprises: the first section and the second section are divided along the first direction, the second section is in sealing fit with the second hole section, the maximum cross-sectional area of the first section is larger than that of the second hole section, and the first section is provided with a second inclined surface which can be tightly attached to the first inclined surface.

When the second section of the first sealing nail is in sealing fit with the second hole section, the second inclined surface of the first section of the first sealing nail is tightly attached to the first inclined surface of the step surface, so that the sealing effect of the area corresponding to the first inclined surface can be realized, and the sealing effect is further improved.

In some embodiments, the first sealing spike further includes a third segment connected to the second segment on a side thereof away from the first segment along the first direction, the third segment having a maximum cross-sectional area greater than a cross-sectional area of the second bore segment.

When the third section of the first sealing nail is inserted into the liquid injection hole along the first direction z and penetrates through the second hole section, the maximum cross section area of the third section of the first sealing nail is larger than that of the second hole section, so that the first sealing nail is limited by the second hole section and is not easy to fall off along the direction opposite to the first direction z, the first sealing nail is not easy to eject out of the liquid injection hole due to the air pressure in the battery monomer in the use process of the battery, and the sealing reliability is ensured.

In some embodiments, the third segment has a crown adjacent the second segment, and the maximum cross-sectional area of the third segment is the maximum cross-sectional area of the crown.

The drum-shaped part of the third section of the first sealing nail adopts a circular arc-shaped outer contour, so that demoulding is facilitated during manufacturing, higher yield can be realized, and production cost is reduced.

In some embodiments, the third section further comprises a conical or frustoconical portion located on the drum portion distal from the second section, the conical or frustoconical portion tapering in cross-sectional area in the first direction.

The conical part or the truncated cone-shaped part of the first sealing nail can guide the first sealing nail to enter the liquid injection hole more smoothly along the first direction, and the assembly difficulty is reduced.

In some embodiments, the cross-sectional area of the second bore section is greater than the cross-sectional area of the end face of the third section on the side remote from the second section.

Because the cross sectional area of the end face of the third section is smaller than that of the second hole section, when the first sealing nail is installed in the liquid injection hole, the third section can penetrate through the second hole section more easily, and the installation difficulty is reduced.

In some embodiments, the cross-sectional area of the second bore section is 1.05 to 1.5 times the cross-sectional area of the end face of the third section on the side remote from the second section.

By enabling the cross-sectional area of the second hole section to be 1.05-1.5 times of the cross-sectional area of the end face of the third section, the end face of the third section can conveniently enter the second hole section, and meanwhile the installation guiding effect is achieved through the sliding of the side profile of the third section and the second hole section.

In some embodiments, the angle β between the generatrix of the conical or frusto-conical portion and a plane perpendicular to the first direction satisfies: beta is more than or equal to 30 degrees and less than or equal to 50 degrees.

Through setting up the suitable contained angle of the generating line that the third section of first seal nail is conical surface or round platform shape and perpendicular to the plane of first direction, can compromise the space occupation of the assembly degree of difficulty and third section in first direction.

In some embodiments, the cell end cap assembly further comprises:

and the second sealing nail is at least partially positioned in the first hole section and is in sealing fit with the first hole section.

Through the sealed cooperation of the sealed nail of second and first hole section, the sealed cooperation of the sealed nail of cooperation first and second hole section has realized annotating the sealed effect of two-stage in liquid hole, has greatly improved sealed effect, has eliminated the risk of annotating liquid hole leakage electrolyte. And the step face in the liquid hole sets up first inclined surface, and the electrolyte that gets into when can guide annotating the liquid hole flows downwards through the guide of first inclined surface, reduces or eliminates electrolyte and annotates downthehole remaining to reduce the risk that remaining electrolyte is heated the evaporation and produces the welding explosion point when welding the second seal nail, further improve the leakproofness, improve the free security of battery.

In some embodiments, a first gap is formed between an end surface of the first seal staple adjacent to one side of the second seal staple and the second seal staple.

The first clearance can provide accommodation space and inflation deformation space for first sealed nail, reduces the influence of first sealed nail inflation to the sealed nail of second to further improve sealing reliability. And the heat of transmitting first sealed nail when the welding of the reducible second sealed nail of clearance through the terminal surface of first sealed nail and the sealed nail of second reduces the risk that first sealed nail is heated inefficacy or burn to improve the sealing reliability of first sealed nail, reduce the quality problems in the manufacturing process. In addition, this clearance can also provide the buffer space that remains the electrolyte between first sealed nail and the sealed nail of second and be heated the vaporization, reduces the sealed nail welding process of second vaporized electrolyte and causes the risk of welding explosion point, ensures welding quality.

In some embodiments, the first gap has a value of 0.3 to 0.6mm.

A suitable first gap value may reduce the risk of thermal failure or burn of the first seal pin while eliminating the need for a battery end cap that is oversized in the first direction.

In some embodiments, a second gap is provided between the step surface and the second seal pin.

Can provide the buffer space that remains the electrolyte between first sealed nail and the sealed nail of second and be heated the vaporization through the second clearance, reduce the risk that the electrolyte of the sealed nail welding in-process vaporization of second caused the welding to explode the point, ensure welding quality. In addition, the second gap can also avoid the interference between the second sealing nail and the first sealing nail during installation.

In some embodiments, the second gap has a value of 0.1 to 0.4mm.

The suitable second gap value can reduce the risk that the vaporized electrolyte causes welding explosion points in the welding process of the second sealing nail, and meanwhile, a battery end cover with an overlarge size in the first direction is not needed.

In some embodiments, the material of the first seal spike comprises rubber.

The first sealing nail can be more conveniently installed relative to the liquid injection hole by utilizing the elasticity of the rubber, the requirement of sealing performance is met, in addition, the rubber can bear relatively high temperature, certain corrosion resistance is realized, and the requirements of the battery end cover assembly during manufacturing and use can be met.

In some embodiments, the material of the second sealing spike comprises a metal.

The use of a second sealing nail comprising metal enables metal welding to achieve a more reliable fixed connection.

In some embodiments, the angle α between the inner wall of the first bore section and a plane perpendicular to the first direction satisfies 90 ≦ α ≦ 130.

The value of the included angle alpha can influence the installation and the positioning of the second sealing nail in the first hole section, and can also limit the occupied size of the liquid injection hole on the end cover.

In some embodiments, the cell end cap assembly further comprises:

a second sealing pin at least partially disposed within the first bore section and in sealing engagement with the first bore section,

wherein the second sealing nail comprises a plate-shaped cover body, a circumferential profile of which has a third inclined surface that is in close contact with an inner wall of the first bore section.

Through the sealed cooperation of the sealed nail of second and first hole section, the sealed cooperation of the sealed nail of cooperation first and second hole section has realized annotating the sealed effect of two-stage in liquid hole, has greatly improved sealed effect, has eliminated the risk of annotating liquid hole leakage electrolyte. And moreover, the second sealing nail is positioned and fixed in the first hole section through the third inclined surface, and the installation difficulty is reduced.

In some embodiments, the included angle α satisfies: alpha is more than or equal to 95 degrees and less than or equal to 120 degrees.

The second sealing nail can be conveniently installed and positioned in the first hole section by limiting the proper included angle alpha, and the space occupation of the liquid injection hole is reduced.

In some embodiments, the cell end cap assembly further comprises:

a second sealing pin at least partially disposed within the first bore section and in sealing engagement with the first bore section,

wherein the second sealing nail comprises a plate-shaped cover body, the plate-shaped cover body and the first hole section are welded at a butt joint part of the plate-shaped cover body and the first hole section, and the plate-shaped cover body is provided with a groove at a position adjacent to the butt joint part.

Through the sealed cooperation of the sealed nail of second and first hole section, the sealed cooperation of the sealed nail of cooperation first and second hole section has realized annotating the sealed effect of two-stage in liquid hole, has greatly improved sealed effect, has eliminated the risk of annotating liquid hole leakage electrolyte. Furthermore, the groove adjacent to the butt joint position can be deformed during welding to relieve the stress caused by welding.

In some embodiments, the weld of the plate-shaped cover and the first bore section is annular, and the groove is located inside the weld and is annular.

The circumferential weld achieves a better sealing effect, while the circumferential groove adjacent to the circumferential weld more evenly relieves the stresses that arise during welding.

In some embodiments, the cell end cap assembly further comprises:

the protective cover covers one end, far away from the first hole section, of the second hole section and is provided with a first through hole.

Electrolyte firstly enters the protective cover from the liquid injection hole under the action of negative pressure and then enters the interior of the single battery through the first through hole in the protective cover. The protection casing can cushion the electrolyte of annotating the liquid hole and pouring into, prevents that electrolyte from getting into the battery monomer fast inside and causing the impact to electrode subassembly.

In some embodiments, the shield is fixedly attached to a surface of the end cap on a side remote from the first bore section. This structure takes up less space.

In some embodiments, the cell end cap assembly further comprises:

the insulating plate is positioned on the front side of the end cover along the first direction and is provided with a second through hole at least partially overlapped with the liquid injection hole;

the protective cover is fixedly connected with the insulating plate or integrally formed with the insulating plate, and is positioned on the surface of one side, far away from the second sealing nail, of the insulating plate.

The insulating board can keep apart the utmost point ear of top cap and electrode subassembly, avoids utmost point ear direct and end cover electricity to be connected and leads to electric leakage scheduling problem. To integrated into one piece's protection casing and insulation board, both can adopt the same insulating material to convenient contour machining, integrated into one piece's structure can also ensure joint strength between them in addition, avoids the protection casing to receive electrode subassembly's collision and leads to the protection casing to be connected inefficacy with the insulation board.

In some embodiments, the shield comprises: the second hole section is far away from the space on one side of the first hole section, and the bottom plate is provided with a plurality of first through holes.

The part of first sealed nail can be protected to the space that encloses of surrounding edge and bottom plate, avoids first sealed nail to fall into the free inside of battery, and a plurality of first through-holes can disperse electrolyte when annotating the liquid on the bottom plate, when reducing the impact to electrode subassembly, makes electrolyte more smoothly get into electrode subassembly.

In one aspect of the present disclosure, there is provided a battery cell including:

a housing having a chamber and an end opening in communication with the chamber;

an electrode assembly located within the chamber; and

the battery end cap assembly is arranged at the end opening.

The battery cell adopting the battery end cover assembly embodiment can realize better safety performance.

In one aspect of the disclosure, a battery includes the aforementioned battery cell.

The battery adopting the battery cell embodiment can realize better safety performance.

In one aspect of the present disclosure, an electric device is provided, which includes the aforementioned battery.

The electric equipment adopting the battery embodiment can realize better safety performance.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings described below are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

The present disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic block diagram of some embodiments of a powered device according to the present disclosure;

fig. 2 is an exploded schematic view of some embodiments of a battery according to the present disclosure;

fig. 3 is an exploded schematic view of some embodiments of a battery cell according to the present disclosure;

FIG. 4 is a cross-sectional schematic view of a mounting structure according to some embodiments of the battery end cap assembly of the present disclosure;

FIG. 5 is an exploded schematic view of FIG. 4;

FIG. 6 is a cross-sectional schematic view of a mounting structure of other embodiments of a battery end cap assembly according to the present disclosure;

FIG. 7 is an exploded schematic view of still further embodiments of battery end cap assemblies according to the present disclosure;

fig. 8 is a schematic cross-sectional view of fig. 7.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Description of reference numerals:

10: a battery cell; 11: a housing; 12: an electrode assembly; 13: a battery end cap assembly; 14: a pole column; 15: a connecting member; 111: the end part is open;

20: an end cap; 21: a liquid injection hole; 211: a first bore section; 212: a second bore section; 213: a step surface; 213a: a first inclined surface; 213b: a planar section;

30: a first seal nail; 31: a first stage; 32: a second stage; 33: a third stage; 311: a second inclined surface; 331: a drum portion; 332: a truncated cone shaped portion;

40: a second seal pin; 41: a plate-shaped cover body; 42: a third inclined surface; 43: a groove; 44: a docking station;

50: a protective cover; 51: a first through hole; 52: an insulating plate; 53: a second through hole;

60: a battery; 61: a box body;

70: a vehicle; 71: a controller; 72: a motor; 73: an axle; 74: and (7) wheels.

Detailed Description

Embodiments of the present disclosure are described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are intended to illustrate the principles of the disclosure, but are not intended to limit the scope of the disclosure, i.e., the disclosure is not limited to the described embodiments.

In the description of the present disclosure, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship merely to facilitate the description of the disclosure and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be taken as limiting the disclosure. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

The directional terms appearing in the following description are intended to be illustrative in all directions and are not intended to limit the specific construction of the disclosure. In the description of the present disclosure, it is further noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present disclosure can be understood as appropriate to one of ordinary skill in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The features in the embodiments described below may be combined with each other without conflict.

The electrolyte is an ion-conducting carrier in a lithium ion battery. In the manufacturing process of the battery, in order to conveniently inject the electrolyte into the battery, a top cover plate of the battery is generally provided with a liquid injection hole which is communicated from top to bottom, and the liquid injection hole needs to be sealed once by using a sealing rubber nail after the electrolyte is injected. If the sealing nails are assembled askew or aged for a long time, leakage may occur, and thus there are safety problems such as performance degradation of the battery, corrosion of the battery, etc. caused by the leakage.

In some related technologies, after the liquid injection hole is sealed by the sealing rubber nail for the first time, the liquid injection hole still needs to be sealed by the sealing aluminum nail for the second time. Regarding the liquid leakage phenomenon existing in the two-stage sealing structure, after research, the inventor finds that the occurrence of the liquid leakage phenomenon is related to various factors, such as the sealing structure, the material of the sealing nail, the assembling process of the sealing nail and the like.

For example, the liquid injection hole in the related art is usually designed to have a step, and the electrolyte is likely to remain after the liquid injection, and has a dead cleaning corner, so that the electrolyte is difficult to effectively remove from the liquid injection hole. The residual electrolyte easily causes pollution to the battery cell, and has a risk of corrosion or an influence on welding performance. When the secondary sealing of the aluminum nail is carried out by adopting a laser welding mode, the residual electrolyte can be vaporized under the action of welding heat, so that waste gas with certain pressure is generated, and if the waste gas rushes out of a molten pool, the problems of pinholes, explosion points, cracks and the like on a welding line can be caused, so that the secondary sealing quality is reduced or loses efficacy, and the safety of a battery monomer is influenced. In addition, when laser welding is adopted, if a molten pool of the sealing structure is close to the sealing rubber nails, burning and gasification of the sealing rubber nails are also easily caused, and the primary sealing quality is reduced or loses efficacy, so that leakage of the battery is caused.

In view of this, the present disclosure provides a battery end cap assembly, a battery cell, a battery and an electric device, which can reduce or eliminate the residue of the electrolyte in the electrolyte injection hole.

The battery end cap assembly of the disclosed embodiments may be applicable to a variety of battery cells. The battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like, which is not limited in the embodiments of the present disclosure. The battery cell may be a cylinder, a flat body, a rectangular parallelepiped, or other shapes, and the embodiment of the present disclosure is not limited thereto.

The battery monomer of this disclosed embodiment is applicable to all kinds of batteries. The battery may be used for supplying power to electric devices such as a vehicle, for example, to provide a power source for steering or a power source for driving the vehicle. The battery may include a case for providing an accommodating space for the battery module, and the battery module mounted in the case. The shell can be made of metal. The battery module may include a plurality of battery cells connected in series, parallel, or series-parallel. The battery cell is the smallest unit constituting the battery. The battery cell includes an electrode assembly capable of electrochemical reaction.

The battery of the embodiment of the disclosure can be suitable for various electric equipment using the battery. The electric devices may be mobile phones, portable devices, notebook computers, battery cars, electric automobiles, ships, spacecrafts, electric toys, electric tools, and the like, for example, the spacecrafts include airplanes, rockets, spacecrafts, and the like, the electric toys include stationary or mobile electric toys, for example, game consoles, electric automobile toys, electric ship toys, electric airplane toys, and the like, and the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric drill impacts, concrete vibrators, and electric planers. The embodiment of the present disclosure does not particularly limit the above-described electric devices.

Fig. 1 is a schematic structural diagram of some embodiments of a powered device according to the present disclosure. For convenience, the electric device will be described as an example of a vehicle. The vehicle 70 may be a fuel-oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle or a hybrid vehicle, etc. The battery 60 may be provided at the bottom or the head or tail of the vehicle 70.

The battery 60 may be used to power the vehicle 70, for example, the battery 60 may be used as an operating power source for the vehicle 70 for circuitry of the vehicle 70, such as for operational power requirements for starting, navigation, and operation of the vehicle 70. The battery 60 may serve not only as an operating power source for the vehicle 70 but also as a driving power source for the vehicle 70, instead of or in part of fuel or natural gas, to provide driving force for the vehicle 70.

An axle 73, wheels 74, a motor 72 and a controller 71 may also be disposed inside the vehicle 70, and the controller 71 is configured to control the battery 60 to supply power to the motor 72, for example, when the vehicle 70 uses the battery 60 as a driving power source, the controller 71 may provide the motor 72 with power required for uniform speed and acceleration. The motor 72 is used to drive the axle 73 to rotate, so as to drive the wheels 73 to rotate.

Fig. 2 is a schematic structural diagram of some embodiments of a battery according to the present disclosure. Fig. 3 is an exploded schematic view of some embodiments of a battery cell according to the present disclosure. Referring to fig. 2, in some embodiments, the battery 60 includes a case 61 and one or more battery cells 10 disposed in the case 61. The case 61 can provide the battery cell 10 with cooling, sealing, and anti-collision functions, and can prevent liquid or other foreign matters from adversely affecting the charging and discharging or safety of the battery cell.

Referring to fig. 2 and 3, the individual cells 10 are electrically connected, such as in series, parallel, or series-parallel, to achieve desired electrical performance parameters of the battery 60. The plurality of battery cells 60 are arranged in rows, and one or more rows of battery cells 10 may be arranged in the case as needed.

In some embodiments, the respective battery cells 10 of the battery 60 may be arranged along at least one of a length direction and a width direction of the case. At least one row or column of the battery cells 60 may be provided according to actual needs. One or more layers of the battery cells 10 may also be provided in the height direction of the battery 60, as needed.

In some embodiments, a plurality of battery cells 10 may be connected in series or in parallel or in series-parallel to form a battery module, and then a plurality of battery modules are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 61. In other embodiments, all the battery cells 10 are directly connected in series or in parallel or in series-parallel, and the whole of all the battery cells 10 is accommodated in the box.

In fig. 3, the battery cell 10 includes: a case 11, an electrode assembly 12, and a cell end cap assembly 13. An electrolyte is also included within the cell 10. The case 11 has a cavity for accommodating the electrode assembly 12 and an end opening 111 communicating with the cavity. The case 11 is determined according to the shape of one or more electrode assemblies 12, and the case 11 may be a hollow rectangular parallelepiped or a hollow square or a hollow cylinder. The housing 11 may be made of a material of conductive metal or plastic, alternatively, the housing 11 is made of aluminum or aluminum alloy.

The cell end cap assembly 13 is disposed at the end opening 111 to form a hermetic chamber with the case 11 that houses the electrode assembly 12. The cell end cap assembly 13 may include two poles 14, the poles 14 having opposite polarities and being electrically connected to the tabs on the corresponding polarity pole pieces of the electrode assembly 12, either by the connecting assembly 15 or directly.

In fig. 3, a first direction z (i.e., z direction) is a direction in which the electrolyte is injected into the battery cell, and a second direction x (i.e., x direction) and a third direction y (i.e., y direction) perpendicular to each other are both perpendicular to the z direction. In some embodiments, the x-direction, the y-direction, and the z-direction may be a width direction, a thickness direction, and a height direction of the battery cell, respectively.

The electrode assembly may include a positive electrode tab, a negative electrode tab, and a separator between the positive electrode tab and the negative electrode tab. The operation of the battery cell is realized by the movement of internal metal ions between the positive pole piece and the negative pole piece.

The positive pole piece comprises a positive current collector and a positive active material layer. The positive electrode tab is connected or formed on the positive electrode current collector. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, and the positive electrode active material may be a lithiation material capable of providing lithium ions, such as lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate. In the case where the positive electrode current collector and the positive electrode active material layer are bonded with a binder, the binder may be PVDF (Polyvinylidene Fluoride) or the like.

The negative pole piece comprises a negative pole current collector and a negative pole active material layer. The negative pole tab is connected and activated on the negative pole current collector. Taking a lithium ion battery as an example, the material of the negative electrode current collector may be copper, and the negative electrode active material may be a material capable of storing lithium ions, such as graphite, silicon, lithium titanate, and the like. In the case of bonding the negative electrode current collector and the negative electrode active material layer with a binder, the binder may be carboxymethyl cellulose, epoxy resin, styrene-butadiene rubber, or the like.

The material of the diaphragm may be PP (polypropylene) or PE (polyethylene). The electrolyte comprises an electrolyte and a solvent, wherein the electrolyte is organic metal salt, inorganic salt and the like and can provide metal ions shuttling between the positive pole piece and the negative pole piece. In order to ensure sufficient overcurrent capacity, the number of the positive electrode tabs may be plural and stacked together, and the number of the negative electrode tabs may be plural and stacked together. In addition, the electrode assembly may have a winding type structure or a lamination type structure, and the embodiment of the present disclosure is not limited thereto.

Fig. 4 is a cross-sectional schematic view of a mounting structure according to some embodiments of the battery end cap assembly of the present disclosure. Fig. 5 is an exploded schematic view of fig. 4. Referring to fig. 4 and 5, a battery end cap assembly 13 is provided in an embodiment of the present disclosure. The assembly includes: and an end cap 20. The end cap 20 has a pour hole 21 that penetrates in the first direction z. The end cap 20 may be a metal plate, such as a copper plate, an iron plate, an aluminum plate, a steel plate, or an alloy plate. The injection hole 21 is used to provide a passage for injecting the electrolyte into the battery cell 10.

The liquid injection hole 21 comprises; a first hole segment 211 and a second hole segment 212 divided along said first direction z. The cross-sectional area of the first bore section 211 is larger than the cross-sectional area of the second bore section 212, a step surface 213 is provided between the first bore section 211 and the second bore section 212, and the step surface 213 includes a first inclined surface 213a inclined toward the second bore section 212 along the first direction z.

The first direction z may be the pouring direction of the pouring hole 21 or the thickness direction of the cap 20. The cross-section of the first bore section 211 and the second bore section 212 may be circular, rectangular, square, or other shapes. The cross-sections may be of the same or different shapes. Here and in the following the cross section can be a cross section perpendicular to the first direction z.

In this embodiment, the step surface 213 of the pouring hole 21 is provided with the first inclined surface 213a, so that the electrolyte entering the pouring hole 21 during pouring can be guided by gravity to flow downwards through the first inclined surface 213a, so that the electrolyte in the first hole section 211 and on the step surface 213 can flow into the second hole section 212 more smoothly and then flow into the electrode assembly 12, and the remaining electrolyte in the pouring hole 21 can be reduced or eliminated. Therefore, the pollution of the electrolyte to the battery cell can be effectively improved.

In order to more thoroughly reduce the residue of the electrolyte, the first inclined surface 213a in fig. 5 may be a circular mesa. The circular table top can guide the electrolyte within the range of 360 degrees, and further reduces the residue of the electrolyte in the injection hole 21. In other embodiments, the first inclined surface 213a may be provided in segments, for example, the first inclined surface 213a includes a plurality of inclined surface segments arranged at equal intervals or unequal intervals along the circumference of the second hole segment 212.

Along the first direction z, the area of the cross-section of the space surrounded by the first inclined surface 213a (i.e., the section perpendicular to the first direction z) is gradually decreased, which facilitates more electrolyte to be guided to the second hole section 212 through the first inclined surface 213a and to enter the electrode assembly 12 from the second hole section 212.

Referring to fig. 5, in some embodiments, the height of the first inclined surface 213a in the first direction z is L, the projection of the first inclined surface 213a on a plane perpendicular to the first direction z is a circular ring, the radial width of the circular ring is D, and the height L and the radial width D satisfy: D/L is more than or equal to 0.2 and less than or equal to 35.

The magnitude of the radial width D affects the ratio of the first inclined surface 213a to the step surface 213 to affect the effect of guiding the flow of the electrolyte, and the height L can affect the degree of inclination of the first inclined surface 213a in cooperation with the radial width D in addition to affecting the ratio of the first inclined surface 213a to the length of the second bore section 212 to affect the sealing effect of the second bore section 212 to affect the guiding effect of the flow of the electrolyte.

In some embodiments, the height L and the radial width D satisfy: 0.5 ≦ D/L ≦ 3.5, optionally, D/L =8/5. By setting a suitable ratio of the radial width D and the height L, both the electrolyte flow effect and the sealing effect of the second bore section 212 can be taken into account.

Considering that during filling, a step surface in the filling hole is usually used to abut against the filling nozzle of the filling device, while the commonly used filling nozzle comprises a flat end surface for positioning, in fig. 5, the step surface 213 further comprises: a planar section 213b perpendicular to the first direction z, the planar section 213b being located outside the first inclined surface 213a away from the second bore section 212. Thus, the flat surface section 213b can be used for being closely matched with the flat end surface of the liquid injection nozzle during liquid injection, so that positioning is realized, and air leakage is avoided during liquid injection under negative pressure. Moreover, this construction also eliminates the need for a pouring nozzle of a special construction.

In some embodiments, the area defined by the inner edge of the planar section 213b may be configured to be larger than the area of the liquid outlet (liquid outlet area) of the liquid injection nozzle, so that the liquid outlet of the liquid injection nozzle is located in the first inclined surface 213a during liquid injection, thereby avoiding the electrolyte from remaining in the planar section 213b, and further preventing the electrolyte from remaining in the liquid injection hole.

Referring to fig. 4 and 5, in some embodiments, the battery end cap assembly 13 further includes a first sealing nail 30, the first sealing nail 30 being at least partially located within the second bore section 212 and in sealing engagement with the second bore section 212. Through at least part at the second hole section that sets up first sealed nail to make first sealed nail and the sealed cooperation of second hole section, make notes liquid hole after annotating the liquid realize sealed through first sealed nail, prevent that electrolyte from outwards leaking through annotating the liquid hole, thereby improve the safety in utilization of battery.

In some embodiments, cell end cap assembly 13 further includes a second seal spike 40. A second seal pin 40 is located at least partially within the first bore section 211 and is in sealing engagement with the first bore section 211. The first sealing nail 30 and the second sealing nail 40 respectively realize two-stage sealing of the liquid filling hole 21 through sealing cooperation with the first hole section 211 and the second hole section 212 of the liquid filling hole 21. Through the two-stage sealing effect, the external impurities of the battery can not enter the single battery, and the electrolyte inside the single battery is prevented from leaking out of the single battery.

In addition, the risk that welding explosion points are generated due to evaporation of residual electrolyte when the second sealing nails 40 are welded is reduced, the sealing performance is further improved, and the safety of the battery cell 10 is improved.

Referring to fig. 4 and 5, in some embodiments, the first seal spike 30 includes: a first segment 31 and a second segment 32 divided along said first direction z. The second section 32 is in sealing engagement with the second bore section 212, the maximum cross-sectional area of the first section 31 is greater than the cross-sectional area of the second bore section 212, and the first section 31 has a second inclined surface 311 capable of closely conforming to the first inclined surface 213a. By making the maximum cross-sectional area of the first section 31 of the first seal nail 30 larger than the cross-sectional area of the second hole section 212, it is possible to ensure that the first seal nail 30 does not fall down inside the battery cell.

In fig. 4, referring to the two cross-sections of the first section 31, the second bore section 212, the transverse dimension h1 (which may be a diameter) of the first section 31 is the largest transverse dimension of the respective cross-section of the first section 31, which corresponds to the largest cross-sectional area. The second bore sections 212 are cylindrical with equal cross-sections and have equal lateral dimensions h2 (which may be diameters) in the first direction z, which correspond to the cross-sectional area of the second bore sections 212. As can be seen from the figure, h1 is larger than h2, e.g. h1=4mm, h2=3.6mm, which corresponds to the relation that the maximum cross-sectional area of the first segment 31 is larger than the cross-sectional area of said second bore segment 212.

While the second section 32 of the first seal nail 30 is in sealing fit with the second hole section 212, the second inclined surface 311 of the first section 31 of the first seal nail 30 is closely attached to the first inclined surface 213a of the step surface 213, so that an auxiliary sealing effect of the area corresponding to the first inclined surface 213a can be achieved, and the overall sealing effect is further improved.

Here, the space surrounded by the first inclined surface 213a has a shape of a revolution, and a generatrix of the shape of the revolution may be a straight line, a convex arc convex in a direction away from the central axis, or a concave arc concave in a direction toward the central axis. While the second inclined surface 311 is contoured to conform to the first inclined surface 213a to ensure a snug fit.

In fig. 4 and 5, the first seal pin 30 may further include a third segment 33 connected to the second segment 32 on a side away from the first segment 31 along the first direction z, wherein a maximum cross-sectional area of the third segment 33 is larger than a cross-sectional area of the second bore segment 212. Since the maximum cross-sectional area of the third section 33 is larger than the cross-sectional area of the second hole section 212, the third section 33 restricts the first sealing nail 30 when the second section 32 of the first sealing nail 30 is in sealing engagement with the second hole section 212, so that the first sealing nail cannot be removed from the liquid injection hole in the opposite direction of the first direction z. Therefore, in the using process of the battery, the first sealing nail 30 cannot be pushed out of the liquid injection hole by gas generated in the battery monomer, and the sealing reliability of the liquid injection hole is ensured.

In fig. 5, the third section 33 may have a drum 331 adjacent to the second section 32, and the maximum cross-sectional area of the third section 33 is the maximum cross-sectional area of the drum 331. This results in the first sealing nail 30 being generally dumbbell-shaped, i.e., having a thinner middle and thicker ends. The transverse dimension in fig. 4 corresponding to the cross-section of the drum 331 is h3 (which may be a diameter), and it can be seen that h3 is larger than h2, e.g. h3=3.7mm, h2=3.6mm, which corresponds to the maximum cross-sectional area of the drum 331 being larger than the cross-sectional area of said second hole segment 212.

Compared with other structures for limiting the first sealing nail 30 to be separated, the circular arc-shaped outer contour of the drum-shaped part 331 is beneficial to demolding during manufacturing, higher yield can be achieved, and production cost is reduced.

Considering that the maximum cross-sectional area of the drum 331 is larger than the cross-sectional area of the second bore section 212, in order to facilitate the first seal pin to pass through the second bore section 212 more easily when installed, referring to fig. 5, in some embodiments, the third section 33 further includes a conical or frustoconical portion 332 located at the drum 331 away from the second section 32.

In fig. 4, the cross-sectional area of the conical or frusto-conical portion 332 tapers in the first direction z. The transverse dimension h4 (which may be the diameter) of the end face of the frustoconical portion 332 furthest from the first section 31. As can be seen from the figure, h4 is smaller than h3, e.g. h4=2.4mm, h3=3.7mm, which corresponds to the smallest cross-sectional area of the truncated-cone-shaped portion 332 (i.e. the cross-sectional area of the end surface of the third segment 33 on the side away from said second segment 32) being smaller than the largest cross-sectional area of the drum-shaped portion 331.

The cross-sectional area of the second hole section 212 is larger than that of the end surface of the third section 33 far away from the second section 32, so that the third section can pass through the second hole section more easily, and the installation difficulty is reduced. Optionally, the cross-sectional area of the second hole section 212 is 1.05 to 1.5 times of the cross-sectional area of the end surface of the third section 33 on the side far away from the second section 32, so that the installation guiding function is realized by the sliding of the side profile of the third section and the second hole section while the end surface of the third section is convenient to enter the second hole section.

When the first sealing pin is installed, the end surface of the third section 33 on the side away from the second section 32 can more easily enter and pass through the second bore section 212 due to the smaller cross-sectional area. While the conical surface of the conical or frusto-conical portion 332 may enable a smoother guiding of the movement of the first sealing nail in the first direction z, thereby effectively reducing assembly difficulties.

In fig. 5, the generatrix of said conical or frusto-conical portion 332 may form an angle β of 35 ° to 45 °, optionally 40 °, with a plane perpendicular to said first direction z. An excessive included angle β may interfere with the passage of the conical or frustoconical portion 332 through the second bore section 212, increasing assembly difficulty. In addition, an excessively large included angle β may also cause the conical or frustoconical portion 332 to be excessively long in the first direction z, taking up too much space within the battery. Too small an angle β provides a limited guiding effect and also makes assembly more difficult. Therefore, by setting a proper included angle between the conical or truncated cone-shaped generatrix of the third section 33 of the first seal nail 30 and the plane perpendicular to the first direction z, both the assembly difficulty and the space occupation of the third section 33 in the first direction z can be considered.

In some embodiments, the material of the first seal pin 30 includes rubber, such as corrosion resistant rubber like viton or epdm. The first sealing nail 30 can be more conveniently installed relative to the liquid injection hole 21 by using the elasticity of rubber, and the requirement of sealing performance is met. The first sealing nail 30 may be a solid structure, and the sectional size of the second section may be slightly larger than that of the second hole section, for example, larger than 0.1-0.3 mm, so that the two may be elastically deformed to realize interference fit, thereby improving the sealing effect. In addition, the rubber can resist relatively high temperature and has certain corrosion resistance, and the requirements of the battery end cover assembly 13 in manufacturing and use can be met.

In some embodiments, the material of the second sealing spike 40 comprises a metal. The second sealing nail may be a metal nail, such as a copper nail, an iron nail, an aluminum nail, a steel nail, or an alloy nail. The metal welding may be performed to achieve a more reliable fixing connection using the second seal nail 40 including metal. The material can be welded with a shell which is also metal by adopting a laser welding process, and secondary sealing of the second sealing nail is realized through a welding seam.

If the electrolyte remains in the filling hole, the heat generated during laser welding vaporizes the electrolyte to generate exhaust gas. Referring to fig. 4, in some embodiments, a first gap g1 is formed between an end surface of first seal nail 30 adjacent to one side of second seal nail 40 and second seal nail 40. The first gap g1 can provide an accommodation space and an expansion deformation space for the first seal nail 30, and reduce the influence of the expansion of the first seal nail 30 on the second seal nail 40, thereby further improving the sealing reliability.

Here, the first gap g1 may be a minimum gap between the end surface of the first seal pin 30 adjacent to the second seal pin 40 and the second seal pin 40, or an average gap between the end surface of the first seal pin 30 adjacent to the second seal pin 40 and the second seal pin 40. In fig. 4, if the end surface is parallel to the end surface of the second seal nail 40, the first gap g1 is both the minimum gap and the average gap.

When there is the clearance between the terminal surface of first sealed nail 30 and the sealed nail 40 of second, can not directly give first sealed nail 30 heat transfer through heat-conducting mode during the sealed nail 40 welding of second, this risk that just reduces first sealed nail 30 and receive thermal failure or burn to improve the sealing reliability of first sealed nail 30, reduce the quality problems in the manufacturing process. On the other hand, this clearance can also provide the buffer space that remains the electrolyte between first sealed nail 30 and the second sealed nail 40 and be heated the vaporization, reduces the risk that the electrolyte that vaporizes in the second sealed nail 40 welding process caused the welding explosion point, ensures welding quality.

Optionally, the value of the first gap g1 is 0.3 to 0.6mm. A suitable value for the first gap g1 may reduce the risk of thermal failure or burning of the first seal pin 30 without requiring the use of a cell end cap 20 that is oversized in the first direction z.

Still referring to fig. 4, in some embodiments, a second gap g2 is provided between the step surface 213 and the second seal nail 40. Here, the second gap g2 may be a minimum gap between the step surface 213 and the second seal pin 40, or may be an average gap between the step surface 213 and the second seal pin 40. In fig. 4, if the step surface 213 is parallel to the surface of the facing portion of the second seal nail 40, the second gap g2 is both the minimum gap and the average gap.

The second gap g2 can provide a buffer space for the electrolyte remained between the first sealing nail 30 and the second sealing nail 40 to be heated and vaporized, so that the risk of welding explosion caused by the vaporized electrolyte in the welding process of the second sealing nail 40 is reduced, and the welding quality is ensured. In addition, the second gap g2 may also prevent interference between the second seal nail 40 and the first seal nail 30 when they are installed.

Optionally, the value of the second gap g2 is 0.1 to 0.4mm. A suitable value for the second gap g2 may reduce the risk of weld explosion caused by electrolyte vaporized during welding of the second sealing nail 40, while eliminating the need for a battery end cap 20 that is oversized in the first direction z.

In some embodiments, the second gap g2 may be smaller than the first gap g1, reducing the amount of heat transferred to the first seal nail 30 during welding by the larger first gap g1, reducing the risk of it being burned, while the smaller second gap g2 may allow the corresponding portion of the second seal nail to be provided with a stress relief structure.

The first bore section 211 may be provided as a constant cross-section bore section. In other embodiments, the first bore section 211 may also be provided as a bore section tapering in the first direction z, such as an inner tapered bore section. Referring to FIG. 5, in some embodiments, the included angle α between the inner wall of the first bore section 211 and a plane perpendicular to the first direction z satisfies 90 ≦ α ≦ 130. The value of the included angle α can affect the installation and positioning of the second sealing pin 40 in the first hole section 211, and can also limit the occupied size of the liquid injection hole 21 on the end cap 20. An excessively large included angle α may result in the pour hole taking up too much space on the end cap, affecting other elements on the end cap. While an angle a that is too small is detrimental to the installation and positioning of second seal pin 40.

In some embodiments, the angle α of the inner wall of the first bore section 211 to a plane perpendicular to the first direction z is greater than 90 ° and less than 130 °. The second sealing nail 40 comprises a plate-shaped cover 41, the circumferential profile of which cover 41 has a third inclined surface 42 which abuts the inner wall of the first bore section 211. The cooperation of third inclined surface 42 and first bore section 211 inner wall can realize the location and the fixed of second seal nail 40 in first bore section 211, stability when being favorable to the welding to reduce the installation degree of difficulty effectively.

Optionally, the angle α is 95 ° to 120 °, optionally 110 °. The second sealing nail 40 can be conveniently installed and positioned in the first hole section 211 by defining a proper included angle alpha, and the space occupation of the liquid injection hole 21 on the end cover is reduced.

In fig. 4 and 5, the second sealing nail 40 includes a plate-shaped cover body 41, the plate-shaped cover body 41 is welded with the first hole section 211 at a butt joint portion 44 of the plate-shaped cover body 41 and the first hole section 211, and the plate-shaped cover body 41 has a groove 43 at a position adjacent to the butt joint portion 44.

The plate-shaped cover body 41 is substantially flush with the edge portion of the first bore section 211 on the end cap 20 to obtain a more regular end cap surface, making the end cap more aesthetically pleasing. The groove 43 adjacent the abutment location 44 is capable of deforming during welding as a stress relief structure on the second seal pin 40 to relieve welding induced stresses.

In fig. 5, the thickness difference between the thickness of the plate-shaped cover 41 corresponding to the groove 43 and the thickness of the other part of the plate-shaped cover 41 is-0.2 mm to 0.2mm, so that the heat transfer is more uniform due to the uniform thickness, and the second sealing nail is not easily melted due to local overheating.

For the circular plate-shaped cover 41 and the first hole section 211 with a circular cross section, the joint of the plate-shaped cover 41 and the first hole section 211 is annular. Accordingly, the weld of the plate-shaped cover 41 to the first bore section 211 is annular, and the groove 43 is located inside the weld and is annular. The circumferential weld achieves a better sealing effect, while the circumferential groove 43 adjacent to the circumferential weld more uniformly relieves the stresses generated during welding.

Fig. 6 is a cross-sectional schematic view of mounting structures of other embodiments of cell end cap assemblies according to the present disclosure. Fig. 7 is an exploded schematic view of still further embodiments of battery end cap assemblies according to the present disclosure. Fig. 8 is a schematic cross-sectional view of fig. 7. Referring to fig. 6-8, in contrast to the previous embodiments, in some embodiments, cell end cap assembly 13 further comprises: a shield 50. The shield 50 covers an end of the second bore section 212 remote from the first bore section 211 and has a first through hole 51. The first through hole 51 may be a circular hole, a rectangular hole, or a through hole of another shape.

The electrolyte firstly enters the protective cover 50 from the electrolyte injection hole 21 under the action of negative pressure, and then enters the interior of the battery cell 10 through the first through hole 51 on the protective cover 50. The protection cover 50 can buffer the electrolyte injected from the liquid injection hole 21, so that the electrolyte is prevented from rapidly entering the interior of the battery cell 10 to impact the electrode assembly 12, the risk of damage to the electrode assembly during liquid injection is reduced, and the safety of the production process is improved.

Referring to fig. 6, in some embodiments, the shield 50 is fixedly attached to a surface of the end cap 20 on a side away from the second first bore section 211. Such as a boot 50 bonded to the end cap 20. With this structure, the space of the battery cell can be less occupied, thereby allowing the electrode assembly of a larger size to be used to increase the amount of electricity.

Referring to fig. 7 and 8, in some embodiments, cell end cap assembly 13 further includes: an insulating plate 52. The insulating plate 52 is located on the front side of the end cap 20 in the first direction z and has a second through hole 53 at least partially coinciding with the second hole section 212. The protective cover 50 is fixedly connected to the insulating plate 52 or integrally formed with the insulating plate 52, and is located on a surface of the insulating plate 52 on a side away from the first hole section 211.

The insulating plate 52 can isolate the tabs of the cap and the electrode assembly 12, and avoid the problem of current leakage caused by the direct electrical connection of the tabs with the cap 20. The protective cover 50 and the insulating plate 52 which are integrally formed can be made of the same insulating material, so that the forming processing is convenient, in addition, the connection strength of the protective cover 50 and the insulating plate 52 can be ensured due to the integrally formed structure, and the connection failure of the protective cover 50 and the insulating plate 52 caused by the collision of the electrode assembly 12 on the protective cover 50 is avoided.

In FIGS. 6-8, the cover 50 may include a peripheral edge 54 and a bottom plate 55, and the peripheral edge 54 and the bottom plate 55 together define a space below the pour hole 21 (i.e., a space on a side of the second hole segment 212 remote from the first hole segment 211). The shroud 50 may be positioned coaxially with the pour spout, with the floor 55 facing the second section 212 of the pour spout 21 and the skirt 54 attached to the side edge of the floor 55. The space can accommodate at least part of the third section 33 of the first sealing nail 30, so that the protective space of the third section 33 of the first sealing nail 30 is realized through the protective cover 50, and the first sealing nail 30 is prevented from passing through the liquid injection hole 21 and entering the interior of the battery cell 10.

The base plate 55 may have a plurality of first through holes 51 to dispersedly introduce the electrolyte into the electrode assembly under the negative pressure, thereby allowing the electrolyte to more smoothly enter the electrode assembly 12 while reducing the impact on the electrode assembly.

Based on each embodiment of the above-mentioned battery end cover subassembly of this disclosure, this disclosed embodiment still provides the battery monomer, including aforementioned battery end cover subassembly. The battery cell using the electrode assembly may obtain more excellent safety performance.

In one aspect of the present disclosure, a battery is provided, which includes the aforementioned battery cell. The battery adopting the single battery can obtain better safety performance.

In one aspect of the present disclosure, an electric device is provided, which includes the aforementioned battery. The electric equipment adopting the battery can obtain better safety performance.

While the disclosure has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the disclosure. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present disclosure is not intended to be limited to the particular embodiments disclosed herein, but rather to include all embodiments falling within the scope of the appended claims.

Claims (33)

1. A battery end cap assembly (13), comprising:

an end cap (20) having a pouring hole (21) penetrating in a first direction (z), the pouring hole (21) including; a first bore section (211) and a second bore section (212) divided along the first direction (z), a cross-sectional area of the first bore section (211) being larger than a cross-sectional area of the second bore section (212), a step surface (213) being provided between the first bore section (211) and the second bore section (212), the step surface (213) comprising a first inclined surface (213 a) inclined toward the second bore section (212) along the first direction (z).

2. The battery end cap assembly (13) of claim 1, wherein the first sloped surface (213 a) is a circular table.

3. The battery end cap assembly (13) of claim 2, wherein the first sloped surface (213 a) has a height L in the first direction (z), a projection of the first sloped surface (213 a) onto a plane perpendicular to the first direction (z) is a circular ring, the circular ring has a radial width D, and the height L and the radial width D satisfy: D/L is more than or equal to 0.2 and less than or equal to 35.

4. The cell end cap assembly (13) of claim 3, wherein the height L and the radial width D satisfy: D/L is more than or equal to 0.5 and less than or equal to 3.5.

5. The battery end cap assembly (13) of claim 3, wherein the step face (213) further comprises: a planar section (213 b) perpendicular to the first direction (z), the planar section (213 b) being located outside the first inclined surface (213 a) away from the second bore section (212).

6. The battery end cap assembly (13) of claim 5, wherein the area defined by the inner edge of the planar section (213 b) is configured to be larger than the area of a liquid outlet of a liquid injection nozzle of a liquid injection device for injecting the liquid injection hole (21).

7. The battery end cap assembly (13) of any of claims 1-6, further comprising:

a first sealing spike (30) at least partially positioned within the second bore section (212) and in sealing engagement with the second bore section (212).

8. The battery end cap assembly (13) of claim 7, wherein the first sealing spike (30) comprises: -a first section (31) and a second section (32) divided along the first direction (z), the second section (32) being adapted to sealingly cooperate with the second bore section (212), the first section (31) having a maximum cross-sectional area larger than the cross-sectional area of the second bore section (212), and the first section (31) having a second inclined surface (311) adapted to closely conform to the first inclined surface (213 a).

9. The battery end cap assembly (13) of claim 8, wherein the first seal pin (30) further comprises a third segment (33) connected to the second segment (32) on a side away from the first segment (31) along the first direction (z), the third segment (33) having a maximum cross-sectional area greater than a cross-sectional area of the second bore segment (212).

10. The cell end cap assembly (13) of claim 9, wherein the third segment (33) has a drum (331) adjacent the second segment (32), the third segment (33) having a maximum cross-sectional area that is the maximum cross-sectional area of the drum (331).

11. The cell end cap assembly (13) of claim 10, wherein the third segment (33) further comprises a conical or frustoconical portion (332) located on the drum portion (331) distal from the second segment (32), the conical or frustoconical portion (332) tapering in cross-sectional area in the first direction (z).

12. The cell end cap assembly (13) of claim 9, wherein the cross-sectional area of the second bore section (212) is greater than the cross-sectional area of the end face of the third section (33) on the side away from the second section (32).

13. The cell end cap assembly (13) of claim 12, wherein the cross-sectional area of the second bore section (212) is 1.05 to 1.5 times the cross-sectional area of the end face of the third section (33) on the side remote from the second section (32).

14. A cell end cap assembly (13) according to claim 11, wherein the generatrix of the conical or frusto-conical portion (332) makes an angle β of 35 ° to 45 ° with a plane perpendicular to the first direction (z).

15. The battery end cap assembly (13) of claim 7, further comprising:

a second sealing spike (40) located at least partially within the first bore section (211) and in sealing engagement with the first bore section (211).

16. The battery end cap assembly (13) of claim 15, wherein the first seal nail (30) has a first gap (g 1) between an end surface adjacent to one side of the second seal nail (40) and the second seal nail (40).

17. The battery end cap assembly (13) of claim 16, wherein the first gap (g 1) is between 0.3 and 0.6mm.

18. The battery end cap assembly (13) of claim 16, wherein the step face (213) and the second seal nail (40) have a second gap (g 2) therebetween.

19. The battery end cap assembly (13) of claim 18, wherein the second gap (g 2) is between 0.1 and 0.4mm.

20. The battery end cap assembly (13) of claim 7, wherein the material of the first seal pin (30) comprises rubber.

21. The battery end cap assembly (13) of claim 15, wherein the material of the second seal pin (40) comprises metal.

22. The battery end cap assembly (13) of any of claims 1-6, wherein the inner wall of the first bore section (211) has an angle α of 90 ° α ≦ 130 ° with respect to a plane perpendicular to the first direction (z).

23. The battery end cap assembly (13) of claim 22, further comprising:

a second sealing spike (40) located at least partially within the first bore section (211) and in sealing engagement with the first bore section (211),

wherein the inner wall of the first bore section (211) has an angle a of more than 90 ° and less than 130 ° with a plane perpendicular to the first direction (z), the second sealing nail (40) comprising a plate-shaped cover body (41), the circumferential profile of the plate-shaped cover body (41) having a third inclined surface (42) which is in abutment with the inner wall of the first bore section (211).

24. The cell end cap assembly (13) of claim 22, wherein the included angle α is 95 ° to 120 °.

25. The battery end cap assembly (13) of any of claims 1-6, further comprising:

a second sealing spike (40) located at least partially within the first bore section (211) and in sealing engagement with the first bore section (211),

wherein the second sealing nail (40) comprises a plate-shaped cover body (41), the plate-shaped cover body (41) is welded with the first hole section (211) at a butt joint part of the plate-shaped cover body (41) and the first hole section (211), and the plate-shaped cover body (41) is provided with a groove (43) at a position adjacent to the butt joint part.

26. The battery end cap assembly (13) of claim 25, wherein the weld of the plate-shaped cover (41) to the first bore section (211) is annular, and the groove (43) is located inside the weld and is annular.

27. The battery end cap assembly (13) of any of claims 1-6, further comprising:

and the protective cover (50) covers one end, far away from the first hole section (211), of the second hole section (212) and is provided with a first through hole (51).

28. The battery end cap assembly (13) of claim 27, wherein the protective cover (50) is fixedly attached to a surface of the end cap (20) on a side away from the first bore section (211).

29. The battery end cap assembly (13) of claim 27, further comprising:

an insulating plate (52) located on the front side of the end cap (20) in the first direction (z) and having a second through hole (53) at least partially coinciding with the second hole section (212);

wherein the protective cover (50) is fixedly connected with the insulating plate (52) or integrally formed with the insulating plate and is positioned on the surface of the insulating plate (52) on the side far away from the first hole section (211).

30. The battery end cap assembly (13) of claim 27, wherein the protective cover (50) comprises: a surrounding edge (54) and a bottom plate (55), wherein the surrounding edge (54) and the bottom plate (55) jointly enclose a space on one side of the second hole section (212) far away from the first hole section (211), and the bottom plate (55) is provided with a plurality of first through holes (51).

31. A battery cell (10), comprising:

a housing (11) having a chamber and an end opening (111) communicating with the chamber;

an electrode assembly (12) located within the chamber; and

the cell end cap assembly (13) of claims 1-30 disposed at said end opening (111).

32. A battery (60), comprising: the battery cell (10) of claim 31.

33. An electrical device, comprising: the battery (60) of claim 32.

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