CN221009065U

CN221009065U - Top cover structure of battery monomer, battery and electric equipment

Info

Publication number: CN221009065U
Application number: CN202322641791.3U
Authority: CN
Inventors: 肖和攀; 徐卫东
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-09-27
Filing date: 2023-09-27
Publication date: 2024-05-24
Anticipated expiration: 2033-09-27

Abstract

The application discloses a top cover structure of a battery monomer, the battery monomer, a battery and electric equipment. The top cover structure comprises a top cover, a terminal assembly and an insulation assembly. The top cover comprises a first surface and a second surface which are opposite to each other in the thickness direction, and is provided with a through hole. The terminal assembly comprises a pole and a pole ring, wherein the pole penetrates through the through hole and protrudes from the first surface and the second surface, the pole ring is sleeved and welded on the protruding part of the pole, and the outer contour size of the pole ring is larger than the size of the through hole. The insulation assembly is arranged between the top cover and the terminal assembly and is used for electrically insulating the top cover from the terminal assembly. When the top cover structure is assembled, the pole ring is sleeved and welded on the part, protruding out of the first surface, of the pole, and the assembly is carried out without using an injection molding encapsulation process, so that the pole cannot sink due to high-temperature baking in a subsequent high-temperature baking process, and the problems of electrolyte leakage and/or poor busbar welding and the like caused by the sinking of the pole are avoided.

Description

Top cover structure of battery monomer, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a top cover structure, a battery monomer, a battery and electric equipment.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

At present, the assembly of positive and negative electrode posts of a battery mostly adopts an injection molding encapsulation process. However, in the high-temperature baking process of the subsequent working procedures of the battery cell, the pole post assembled by the injection molding encapsulation process is easy to sink, on one hand, the compression amount of the sealing ring is reduced and electrolyte leakage occurs due to the fact that the pole post is sunk into the upper insulating piece, and on the other hand, poor welding of the busbar is caused.

Disclosure of utility model

In view of the above problems, the application provides a top cover structure, a battery cell, a battery and electric equipment, which can solve the problems of electrolyte leakage/leakage and/or poor flow discharge welding caused by sinking of a pole.

In a first aspect, the present application provides a top cover structure of a battery cell, the top cover structure including a top cover, a terminal assembly, and an insulation assembly. The top cover comprises a first surface and a second surface which are opposite to each other in the thickness direction, and a through hole penetrating through the first surface and the second surface is formed. The terminal assembly comprises a pole and a pole ring, the pole penetrates through the through hole and protrudes from the first face and the second face, the pole ring is sleeved and welded on the portion, protruding out of the first face, of the pole, and the outer contour size of the pole ring is larger than the size of the through hole. The insulation assembly is disposed between the top cover and the terminal assembly and is used for electrically insulating the top cover from the terminal assembly.

In the top cover structure of the technical scheme, the terminal assembly comprises the pole column and the pole column ring of the split structure, the outer outline size of the pole column ring is larger than the size of the through hole, and when the terminal assembly is assembled, the pole column ring is sleeved and welded on the part, protruding out of the first surface, of the pole column without using an injection molding encapsulation process for assembly, so that the pole column cannot sink due to high-temperature baking in the subsequent high-temperature baking process, and the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the pole column are avoided. In addition, the arrangement of the insulating assembly can avoid electric conduction between the top cover and the terminal assembly, so that the top cover is unsafe due to electric leakage (electrification) of the top cover.

As an alternative solution of the present application, a height difference is provided between the top surface of the pole ring and the top surface of the pole.

In the technical scheme, the height difference is arranged between the top surface of the pole ring and the top surface of the pole, when the pole ring is welded on the pole, the space where the height difference is located can contain welding slag and/or welding seams and the like, so that the final welding seams can be prevented from protruding out of the top surface of the pole and the higher one of the top surfaces of the pole ring to jack up the busbar, the stability of the penetration width of the welding seams is ensured, and the connection strength, the electrical connection stability and the overcurrent capacity of the terminal assembly are further ensured.

As an alternative technical scheme of the application, the range of the height difference is [0.1mm,1.0mm ].

In the technical scheme, the range of the height difference between the top surface of the pole ring and the top surface of the pole is 0.1mm and 1.0mm, so that the stability of the weld penetration width can be ensured, and the connection strength, the electrical connection stability and the overcurrent capacity between the pole ring and the pole ring are further ensured; on the other hand, the welding connection strength between the pole ring and the pole can be ensured.

As an alternative solution of the present application, the top surface of the pole ring protrudes compared to the top surface of the pole.

In the above technical scheme, the top surface of the polar ring is protruded compared with the top surface of the polar post, a height difference can be formed between the top surface of the polar ring and the top surface of the polar post, when the polar ring is welded on the polar post, the space where the height difference is located can contain welding slag and/or welding seams and the like, so that the final welding seams can be prevented from being protruded out of the top surface of the polar post and the higher one of the top surfaces of the polar ring to jack up the busbar, the stability of the welding seam penetration width is ensured, and the connection strength, the electric connection stability and the overcurrent capacity of the terminal assembly are further ensured.

As an alternative solution of the present application, the top surface of the pole is protruded compared to the top surface of the pole ring.

In the above technical scheme, the top surface of utmost point post compares in the top surface protrusion of utmost point post ring, can form the difference in height between the top surface of utmost point post ring and the top surface of utmost point post, when utmost point post ring welds on the utmost point post, the space that the difference in height is located can hold welding slag and/or welding seam etc. to can avoid final welding seam protrusion in the higher of the top surface of utmost point post and the top surface of utmost point post ring and jack-up busbar, guarantee the stability of welding seam penetration width, and then guarantee terminal assembly's joint strength, electric connection stability and overflow ability.

As an alternative technical scheme of the application, the inner side edge of the pole ring, which is close to the pole, is provided with a containing groove, and the bottom surface of the containing groove is flush with the top surface of the pole.

In the above technical scheme, the inner side edge of the pole ring, which is close to the pole, is provided with the accommodating groove, the bottom surface of the accommodating groove is flush with the top surface of the pole, so that the height difference can be formed between the top surface of the pole ring and the top surface of the pole, and the depth of the space where the height difference is located can be equal. When the pole ring is welded on the pole, on one hand, the space where the height difference is located can accommodate welding slag and/or welding seams and the like, so that the final welding seams are prevented from protruding out of the upper surface of the pole and the upper surface of the pole ring to jack up the busbar, the stability of the penetration width of the welding seams is ensured, and the connection strength, the electrical connection stability and the overcurrent capacity of the terminal assembly are further ensured; on the other hand, the depth of the space where the height difference is located is equal everywhere, so that the stability of the penetration width of the final welding line can be further ensured, the flatness of the upper surface of the final welding line is improved, and the stability can be increased when the busbar is welded.

As an alternative solution of the present application, the side edge of the pole is recessed from the top surface of the pole toward the bottom surface of the pole to form a step surface, and the step surface is flush with the top surface of the pole ring.

In the above technical scheme, the side edge of the pole is recessed from the top surface of the pole to the bottom surface of the pole to form a step surface, and the step surface is flush with the top surface of the pole ring, so that a height difference can be formed between the top surface of the pole ring and the top surface of the pole, and the depth of the space where the height difference is located is equal everywhere. When the pole ring is welded on the pole, on one hand, the space where the height difference is located can accommodate welding slag and/or welding seams and the like, so that the final welding seams are prevented from protruding out of the upper surface of the pole and the upper surface of the pole ring to jack up the busbar, the stability of the penetration width of the welding seams is ensured, and the connection strength, the electrical connection stability and the overcurrent capacity of the terminal assembly are further ensured; on the other hand, the depth of the space where the height difference is located is equal everywhere, so that the stability of the penetration width of the final welding line can be further ensured, the flatness of the upper surface of the final welding line is improved, and the stability can be increased when the busbar is welded.

As an alternative technical scheme of the application, the pole is manufactured by adopting a stamping or cold heading process.

The pole columns with two protruding ends and a middle recess in the prior art cannot be manufactured through a stamping process, and are required to be manufactured through machining, so that the efficiency is low and the cost is high. The pole in the technical scheme is manufactured by adopting a stamping or cold heading process, and compared with the pole manufactured by machining, the cost of the terminal assembly is greatly reduced.

As an alternative technical scheme of the application, the upper end of the pole is provided with a protruding part, and the pole ring is borne on the protruding part.

In the technical scheme, the upper end of the pole is provided with the protruding part, and before the pole ring is welded on the pole, the pole ring can be borne on the protruding part, so that the welding is convenient.

As an optional technical scheme of the application, the pole comprises a connected column body and a flange part, wherein the column body penetrates through the through hole, and the flange part protrudes from one side where the second surface is located; the insulation assembly comprises a first insulation piece, a second insulation piece and a sealing piece. The first insulating piece is arranged on one side where the first surface is located, and the first insulating piece is clamped between the top cover and the pole collar. The second insulating piece is arranged on one side where the second surface is located, and the second insulating piece is clamped between the top cover and the pole. The sealing member surrounds the column, is provided between the top cover and the flange portion in a thickness direction of the top cover, and is provided between the column and the second insulating member in a length direction of the top cover.

In the above technical scheme, the first insulating piece is clamped between the top cover and the pole collar so as to electrically insulate the top cover from the pole collar, and the second insulating piece is clamped between the top cover and the pole so as to electrically insulate the top cover from the pole, thereby reducing the risk of electric conduction between the top cover and the terminal assembly to cause electric leakage of the top cover. The sealing element is positioned between the column body and the second insulating element, and can prevent electrolyte from entering a gap between the column body and the second insulating element, so that the electrolyte is prevented from leaking to the outside of the shell from the gap between the pole column and the top cover, and meanwhile, the electrolyte is prevented from soaking a composite interface on the column body to cause chemical corrosion of the composite interface, and further, good electrical connection performance of the terminal assembly is ensured.

As an alternative solution of the present application, the first insulating member is manufactured by injection molding.

In the technical scheme, because the first insulating piece is manufactured by adopting an injection molding process, one-die multi-hole production of the first insulating piece can be realized, the production efficiency of the first insulating piece can be improved, and the production cost of the first insulating piece can be reduced.

As an alternative technical scheme of the application, the first insulating part comprises an insulating body and a ring-shaped first insulating cylinder extending from a first side of the insulating body, the polar ring is arranged in a cavity surrounded by the first insulating cylinder and the insulating body, the top surface of the polar ring protrudes out of the top surface of the first insulating cylinder, and the top surface of the polar ring protrudes out of the top surface of the first insulating cylinder by 0.3-0.5 mm.

In the above technical scheme, the top surface of utmost point post ring is more the top surface protrusion 0.3mm-0.5mm of first insulating cylinder, and when heat conduction makes its inflation to first insulating part in the battery use, protrusion 0.3mm-0.5mm can reserve the expansion space for first insulating part, avoids the first insulating part jack-up busbar after the inflation and takes place friction and produce metal chip, and then leads to battery safety risk.

As an alternative solution of the present application, the first insulating member includes an insulating body and a second annular insulating cylinder extending from a second side of the insulating body, the second insulating cylinder penetrates through the through hole and is located between the column and an inner sidewall of the through hole, and a bottom surface of the second insulating cylinder protrudes relative to the second surface.

In the above technical scheme, the bottom surface of the second insulating cylinder protrudes relative to the second surface, so that the top cover and the terminal assembly are conducted due to the fact that conductive metal scraps remain in the manufacturing process of the top cover, and the risk of top cover leakage is avoided.

As an alternative technical scheme of the application, a first groove surrounding the through hole is formed in one side of the second surface, a protrusion is arranged on one side of the second insulating piece, facing the top cover, and is accommodated in the first groove and matched with the first groove, a second groove is arranged on one side of the second insulating piece, far away from the top cover, and the flange part is accommodated in the second groove and matched with the second groove.

In the above technical scheme, the protrusion on the second insulating piece is matched with the first groove on the top cover, and the flange part of the pole is matched with the second groove on the second insulating piece, so that the torsional strength of the pole can be improved on one hand, the height of the terminal assembly can be reduced on the other hand, and the installation space for installing other elements in the battery cell is increased.

As an alternative solution of the present application, the polar column has a copper-aluminum composite interface, and a distance between the composite interface and a first surface of the flange portion facing the top cover in a direction from the second surface to the first surface is greater than a distance between a bottom surface of a second insulating cylinder of the first insulating member and the first surface.

In the above technical scheme, the distance between the composite interface and the first surface of the flange part is greater than the distance between the bottom surface of the second insulating cylinder and the first surface of the flange part, so that the composite interface is prevented from being positioned below the bottom surface of the second insulating cylinder, namely, the chemical corrosion phenomenon caused by the fact that the composite interface is soaked in electrolyte is avoided, and the good electric connection performance of the terminal assembly is ensured.

As an alternative solution of the present application, the composite interface protrudes from 0.1mm to 0.8mm relative to the first surface.

In the technical scheme, the composite interface protrudes 0.1-0.8 mm relative to the first surface, so that the composite interface can not be soaked in electrolyte to generate chemical corrosion phenomenon, and the good electric connection performance of the terminal assembly is ensured; on the other hand, the consumption of copper materials can be saved, and the cost of the terminal assembly is reduced.

As an optional technical scheme of the application, a first boss surrounding the through hole is formed on one side where the first surface is located, the first boss is provided with a containing groove surrounding the through hole, the first insulating piece is contained in the containing groove, and the pole ring is contained in the first insulating piece; the accommodating groove, the first insulating piece and the pole ring are of special-shaped structures.

In the technical scheme, the arrangement of the first boss can reduce the height space of the inside of the battery cell occupied by the terminal assembly on one hand, and can increase the pressure resistance and the deformation resistance of the terminal assembly on the other hand. In addition, the accommodating groove, the first insulating piece and the pole ring are of special-shaped structures, so that the first insulating piece can be prevented from being installed in the accommodating groove in a fashionable manner, and the pole ring can be prevented from being installed in the first insulating piece in a fashionable manner.

As an alternative solution of the present application, a recess surrounding the through hole is formed on a side where the second surface is located, a second boss is disposed on a side of the second insulating member facing the top cover, the second boss is accommodated in the recess and cooperates with the recess, and the second boss is carried on the first surface of the flange portion.

In the technical scheme, the second boss of the second insulating part is accommodated in the concave of the top cover, so that the height space of the inside of the battery cell occupied by the second insulating part can be reduced; meanwhile, the second boss of the second insulating part is borne on the first surface of the flange part, so that the second insulating part can be ensured to be stably arranged between the pole and the top cover, and the installation stability is improved.

In a second aspect, the present application provides a battery cell, where the battery cell includes the top cover structure according to any one of the foregoing embodiments.

In the single top cover structure of the battery, the terminal assembly comprises the pole column and the pole ring of the split structure, the outer outline size of the pole ring is larger than the size of the through hole, and when the battery is assembled, the pole ring is sleeved and welded on the part, protruding out of the first surface, of the pole column without using an injection molding encapsulation process, so that the pole column cannot sink due to high-temperature baking in the subsequent high-temperature baking process, and the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the pole column are avoided. In addition, the arrangement of the insulating assembly can avoid electric conduction between the top cover and the terminal assembly, so that the top cover is unsafe due to electric leakage (electrification) of the top cover.

In a third aspect, the present application provides a battery, which includes the battery cell according to any one of the above embodiments.

In the top cover structure of the battery of the technical scheme, the terminal assembly comprises the pole column and the pole collar of the split structure, the outer outline size of the pole collar is larger than the size of the through hole, and when the battery is assembled, the pole collar is sleeved and welded on the part, protruding out of the first surface, of the pole column without using an injection molding encapsulation process, so that the pole column cannot sink due to high-temperature baking in the subsequent high-temperature baking process, and the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the pole column are avoided. In addition, the arrangement of the insulating assembly can avoid electric conduction between the top cover and the terminal assembly, so that the top cover is unsafe due to electric leakage (electrification) of the top cover.

In a fourth aspect, the present application provides an electric device, where the electric device includes a battery according to any one of the foregoing embodiments.

In the top cover structure of the battery of the electric equipment of the technical scheme, the terminal assembly comprises the pole column and the pole ring of the split structure, the outer outline size of the pole ring is larger than the size of the through hole, and when the battery is assembled, the pole ring is sleeved and welded on the part, protruding out of the first surface, of the pole column without using an injection molding encapsulation process, so that the pole column cannot sink due to high-temperature baking in the subsequent high-temperature baking process, and the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the pole column are avoided. In addition, the arrangement of the insulating assembly can avoid electric conduction between the top cover and the terminal assembly, so that the top cover is unsafe due to electric leakage (electrification) of the top cover.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the accompanying drawings. In the drawings:

Fig. 1 is a schematic perspective view illustrating a battery cell according to some embodiments of the present application;

Fig. 2 is a perspective assembly view illustrating a top cap structure of a battery cell according to some embodiments of the present application;

FIG. 3 is a perspective assembly schematic view of the cap structure of FIG. 2 from another perspective;

FIG. 4 is an exploded perspective view of one view of the header structure shown in FIG. 2;

FIG. 5 is an exploded perspective view of the alternative view of the roof structure of FIG. 2;

FIG. 6 is a schematic perspective cross-sectional view of the top cover structure shown in FIG. 2;

FIG. 7 is a schematic plan cross-sectional view of the roof structure of FIG. 2 and an enlarged schematic view of a portion of the structure;

fig. 8 is a perspective assembly view illustrating a top cap structure of a battery cell according to other embodiments of the present application;

FIG. 9 is a perspective assembly schematic view of another view of the roof structure shown in FIG. 8;

FIG. 10 is a schematic perspective cross-sectional view of the top cover structure shown in FIG. 8;

FIG. 11 is a schematic plan cross-sectional view of the roof structure of FIG. 8 and an enlarged schematic view of a portion of the structure;

Fig. 12 is a perspective assembly view illustrating a top cap structure of a battery cell according to still other embodiments of the present application;

FIG. 13 is a perspective assembly schematic view of another view of the roof structure shown in FIG. 12;

FIG. 14 is a schematic perspective cross-sectional view of the cap structure shown in FIG. 12;

FIG. 15 is a schematic plan view in cross section of the roof structure of FIG. 12 and an enlarged schematic view of a portion of the structure;

fig. 16 is a perspective assembly view illustrating a top cap structure of a battery cell according to still other embodiments of the present application;

FIG. 17 is a perspective assembly schematic view of another view of the header structure shown in FIG. 16;

FIG. 18 is a schematic perspective cross-sectional view of the cap structure shown in FIG. 16;

FIG. 19 is a schematic plan view in cross section of the roof structure of FIG. 16 and an enlarged schematic view of a portion of the structure;

fig. 20 is an exploded perspective view of a battery according to some embodiments of the present application;

Fig. 21 is a schematic plan view of a powered device according to some embodiments of the present application.

Reference numerals in the specific embodiments are as follows:

a vehicle 10000;

battery 1000, controller 2000, motor 3000;

a housing 300, a first portion 301, a second portion 303;

The battery cell 100, the case 10, the top cover structure 30, the top cover 31, the thickness direction Z, the first face 311, the second face 313, the through hole 314, the first groove 315, the first boss 317, the accommodating groove 318, the recess 319, the terminal assembly 33, the post 331, the top face 3311 of the post 331, the bottom face 3312 of the post 331, the step face 3313, the protruding portion 3315, the post 3316, the flange portion 3317, the first face 3318 of the flange portion 3317, the composite interface 3319, the post ring 333, the top face 3331 of the post ring 333, the accommodating groove 3333, the bottom face 3335 of the accommodating groove 3333, the insulating member 34, the first insulating member 35, the insulating body 355, the first insulating cylinder 357, the bottom face 353 of the first insulating cylinder 357, the second insulating cylinder 359, the second insulating member 37, the protrusion 371, the second groove 373, the second boss 375, and the sealing member 39.

Detailed Description

Embodiments of the technical scheme of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only for more clearly illustrating the technical aspects of the present application, and thus are merely examples, and are not intended to limit the scope of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion.

In the description of embodiments of the present application, the technical terms "first," "second," and the like are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In the description of the embodiments of the present application, the positional or positional relationship indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the positional or positional relationship shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of the present application.

In describing embodiments of the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; or may be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present application will be understood by those skilled in the art according to specific circumstances.

Referring to fig. 1, a battery cell 100 according to some embodiments of the application is shown. The battery cell 100 refers to the smallest unit constituting the battery 1000 (shown in fig. 20). The battery cell 100 may be a primary battery or a secondary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries. The battery cell 100 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. The battery cell 100 includes a case 10, a top cover structure 30, and a pole piece unit (not shown). The housing 10 is provided with an opening, and the top cover structure 30 covers the opening, and the pole piece units are located in the housing 10.

Specifically, the case 10 may have a cylindrical structure, and a receiving chamber for receiving the pole piece unit and the electrolyte is formed inside the case 10. At least one end of the housing 10 is provided with an opening through which the pole piece unit can be placed in the receiving cavity of the housing 10 and covered by the cap structure 30. The housing 10 may include a metal material, such as aluminum or aluminum alloy, and may also include an insulating material, such as plastic. In some embodiments, the cross-sectional shape of the case 10 may be circular, in which case the battery cell 100 is a battery cell 100 of a cylindrical structure. In other embodiments, the cross-sectional shape of the case 10 may be rectangular, i.e., the battery cell 100 is a square-structured battery cell 100. The present application will be described with reference to the battery cell 100 having a square structure as the battery cell 100.

The pole piece unit comprises a negative pole piece, a positive pole piece and an isolating film, wherein the isolating film is positioned between the adjacent negative pole piece and positive pole piece and is used for isolating the negative pole piece and the positive pole piece. In one possible design, the negative electrode sheet, the separator and the positive electrode sheet are sequentially laminated and wound to form a pole sheet unit, i.e., the pole sheet unit is a wound structure. Meanwhile, the electrode plate units are provided with gaps after being formed, electrolyte can enter the electrode plate units through the gaps, and the negative electrode plate and the positive electrode plate are infiltrated. The negative electrode sheet includes a negative electrode current collector (e.g., copper foil) and a negative electrode active material layer (e.g., carbon or silicon) coated on a surface of the negative electrode current collector, and the positive electrode sheet includes a positive electrode current collector (e.g., aluminum foil) and a positive electrode active material layer (e.g., ternary material, lithium iron phosphate or lithium cobalt oxide) coated on a surface of the positive electrode current collector.

The top cover structure 30 is a member that is covered on the top opening of the case 10 of the battery cell 100 to provide a closed space for the electrode sheet unit and electrolyte and the like located inside the case 10, and the electric power of the electrode sheet unit can be drawn out to the outside through the top cover structure 30.

Specifically, referring to fig. 2 to 5, a top cover structure 30 of a battery cell 100 according to some embodiments of the present application is shown. Referring to fig. 2 and 4, the top cover structure 30 includes a top cover 31, a terminal assembly 33 and an insulation assembly 34. The top cover 31 includes a first face 311 and a second face 313 opposite to each other in the thickness direction Z, and is provided with a through hole 314 penetrating the first face 311 and the second face 313. The terminal assembly 33 includes a pole 331 and a pole ring 333, the pole 331 is penetrated through the through hole 314 and protrudes from the first surface 311 of the top cover 31 and the second surface 313 of the top cover 31, the pole ring 333 is sleeved and welded on the portion of the pole 331 protruding from the first surface 311 of the top cover 31, and the outer dimension of the pole ring 333 is larger than the dimension of the through hole 314. The insulation assembly 34 is disposed between the top cover 31 and the terminal assembly 33, and serves to electrically insulate between the top cover 31 and the terminal assembly 33.

Referring to fig. 1, the top cap 31 refers to a member that is covered at the opening of the case 10 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the top cover 31 may be adapted to the shape of the opening of the housing 10 to fit the housing 10. Alternatively, the top cover 31 may be made of a material (such as an aluminum alloy) with a certain hardness and strength, so that the top cover 31 is not easy to deform when being extruded and collided, so that the battery cell 100 can have a higher structural strength, and the safety performance can be improved. The side of the first surface 311 of the top cover 31 is a side facing away from the interior of the housing 10, and the side of the second surface 313 of the top cover 31 is a side facing toward the interior of the housing 10. The thickness direction Z of the top cover 31 means: the first side 311 of the top cap 31 is directed in the direction of the second side 313 of the top cap 31 or the second side 313 of the top cap 31 is directed in the direction of the first side 311 of the top cap 31.

The terminal assembly 33 is a functional part for guiding the current in the pole unit to the outside of the battery cell 100 to output the electric power of the pole unit, and for guiding the electric power of the outside of the battery cell 100 to the pole unit. The terminal assembly 33 includes a pole 331 and a pole ring 333. The post 331 is a member penetrating the top cap 31 from the inside of the battery cell 100 and protruding to the outside of the top cap 31 to be electrically connected. The pole ring 333 is an annular component that performs electrical connection, and the pole ring 333 may be a circular ring structure, a square ring structure, or other shaped ring structures. It should be noted that "shaped" in the present application refers to an irregular shape, that is, a shape different from a conventional regular shape such as a circle, an ellipse, a square (including a rectangle and a square), an isosceles triangle, a regular pentagon, or a regular hexagon, and for example, the "shaped" may be an irregular pentagon, an irregular hexagon, or an irregular heptagon.

The pole 331 and the pole ring 333 are of a single structure. In some embodiments, the pole 331 may be formed using a stamping or cold heading process. The pole columns with two protruding ends and a middle recess in the prior art cannot be manufactured through a stamping process, and are required to be manufactured through machining, so that the efficiency is low and the cost is high. The pole 331 of the embodiment of the application is manufactured by stamping or cold heading, and the cost of the terminal assembly 33 is greatly reduced compared with the pole manufactured by machining.

In some embodiments, pole ring 333 may also be formed using a stamping or cold heading process. The pole ring 333 of the embodiment of the present application is manufactured by a stamping or cold heading process, and the cost of the terminal assembly 33 of the present application is greatly reduced compared to a machined pole.

The terminal assembly 33 may be a positive terminal assembly 33A or a negative terminal assembly 33B. In the case where the terminal assembly 33 is the positive terminal assembly 33A, the terminal assembly 33 includes a positive post 331 and a positive post ring 333; in the case where the terminal assembly 33 is a negative terminal assembly 33B, the terminal assembly 33 includes a negative post 331 and a negative post ring 333. Because the external circuit of the battery cell 100 is made of aluminum material, the cost and weight of the battery cell 1000 (shown in fig. 1) in the external circuit can be reduced, and aluminum sheets are generally used for connection between the battery cells 1000 in the external circuit, and in the pole piece units inside the battery cell 100, aluminum foil materials are used as the positive current collector and copper foil materials as the negative current collector, so that the use performance of the battery cell 100 can be ensured only by requiring the aluminum material for the positive pole 331 and the copper material for the negative pole 331. According to this need, the positive terminal assembly 33A may be entirely made of aluminum, that is, the portion of the positive electrode post 331 located inside the accommodation chamber of the case 10 is made of aluminum, the portion of the positive electrode post 331 located outside the case 10 is also made of aluminum, and the positive electrode post ring 333 is also made of aluminum. The negative electrode post 331 may be a composite electrode post formed by compounding copper and aluminum, and a portion of the negative electrode post 331 made of a copper material is located inside the accommodating cavity of the case 10, while a portion of the negative electrode post 331 made of an aluminum material protrudes outside the case 10, and the negative electrode post ring 333 is also made of an aluminum material.

The conventional terminal assembly, whether it be a positive terminal assembly or a negative terminal assembly, is often assembled by an injection molding encapsulation process. However, in the high-temperature baking process of the battery cell subsequent procedure, the crystal lattice of the injection molding part changes, so that the injection molding part deforms, the pole is easy to sink, on one hand, the compression amount of the sealing ring is reduced, the electrolyte leakage occurs, and on the other hand, the pole is contracted into the upper insulating part, and the bus bar is poor in welding. Moreover, during the assembly process, workers need to take and put products with the anti-scalding glove, and the workers are easy to scald due to the high temperature of the machine.

The insulation member 34 is a member disposed between the top cover 31 and the terminal member 33 to electrically insulate between the top cover 31 and the terminal member 33. The insulating assembly 34 may include one element or multiple elements, and in the present application, the insulating assembly 34 includes two elements for easy installation and molding. In addition, the insulating member 34 may be made of an electrically insulating material such as plastic, resin, and rubber.

In the top cover structure 30 according to the embodiment of the application, the terminal assembly 33 includes the post 331 and the post ring 333 which are in a split structure, and the outer dimension of the post ring 333 is larger than the dimension of the through hole 314, when assembling, the post ring 333 is sleeved and welded on the portion of the post 331 protruding from the first surface 311 of the top cover 31, and the assembly by using an injection molding encapsulation process is not needed, so that the post 331 is not sunk due to high temperature baking in the subsequent high temperature baking process, thereby avoiding the problems of electrolyte leakage and/or poor busbar welding caused by the sunk post 331. Meanwhile, the assembly process of the top cover structure 30 is simplified into a welding process, the assembly difficulty is greatly reduced, automation is easy to realize, and the assembly efficiency is greatly improved. Moreover, the assembly process of the top cover structure 30 does not need a worker to take and put products with the anti-scalding glove, so that the safety problem caused by scalding of the worker can be avoided, and the production safety is improved.

Referring to fig. 6 and 7, in some embodiments, there is a height difference between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331.

Specifically, the top surface 3331 of the pole ring 333 is the surface of the pole ring 333 furthest from the first face 311 of the top cap 31, and the top surface 3311 of the pole 331 is the surface of the portion of the pole 331 protruding from the first face 311 of the top cap 31 furthest from the first face 311 of the top cap 31. There is a difference in height between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331, i.e., the top surface 3331 of the pole ring 333 is not coplanar with the top surface 3311 of the pole 331. When the pole ring 333 is welded on the pole 331, the space where the height difference is located can accommodate welding slag and/or welding seam, so as to avoid the final welding seam protruding out of the higher of the top surface 3311 of the pole 331 and the top surface 3331 of the pole ring 333 to jack up the busbar, ensure the stability of the welding seam penetration width, and further ensure the connection strength, electrical connection stability and overcurrent capacity of the terminal assembly 33.

Specifically, in certain embodiments, the height difference between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331 ranges from [0.1mm,1.0mm ]. For example, the height difference between the top surface 3331 of the pole collar 333 and the top surface 3311 of the pole 331 may be any one of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm, or any value between any two values. If the difference in height between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331 is less than 0.1mm, when the pole ring 333 is welded to the pole 331, the weld will protrude from the higher of the top surface 3311 of the pole 331 and the top surface 3331 of the pole ring 333, and the lifting of the bus bar will not result in high connection strength, electrical connection stability and overcurrent capability between the pole 331 and the pole ring 333. If the difference in height between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331 is greater than 0.1mm, the connection strength, the electrical connection stability and the overcurrent capability between the pole 331 and the pole ring 333 can be ensured, but the difference in height between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331 is too large, or the welding (connection) height between the pole ring 333 and the pole 331 is insufficient (the top surface 3331 of the pole ring 333 is higher than the top surface 3311 of the pole 331), resulting in unstable connection between the two, or the welding (connection) height between the pole ring 333 and the pole 331 is sufficient (the top surface 3331 of the pole ring 333 is lower than the top surface 3311 of the pole 331), but the material consumption of the pole 331 is wasted, and the cost is increased. Therefore, the height difference between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331 is in the range of [0.1mm,1.0mm ], which can ensure the stability of the weld penetration width on one hand, and further ensure the connection strength, the electrical connection stability and the overcurrent capability between the pole 331 and the pole ring 333; on the other hand, the welding strength between the pole ring 333 and the pole 331 can be ensured, and the cost can be saved.

With continued reference to fig. 6 and 7, in some embodiments, a top surface 3331 of the pole ring 333 protrudes from a top surface 3311 of the pole 331.

The top surface 3331 of the tab 333 is protruded compared to the top surface 3311 of the tab 331, i.e., referring to fig. 1, in the height direction H of the battery cell 100 (i.e., the thickness direction Z of the top cap 31), the top surface 3331 of the tab 333 is higher than the top surface 3311 of the tab 331. In this way, a height difference can be formed between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331, when the pole ring 333 is welded on the pole 331, the space where the height difference is located can accommodate welding slag and/or welding seam, so as to avoid the final welding seam protruding out of the higher one of the top surface 3311 of the pole 331 and the top surface 3331 of the pole ring 333 to jack up the bus bar, ensure the stability of the penetration width of the welding seam, and further ensure the connection strength, electrical connection stability and overcurrent capability of the terminal assembly 33.

More specifically, welding between the post 331 and the post ring 333 may generate welding marks, the welding marks have a certain protrusion, when the post 331 and the bus bar are welded to realize the mutual electrical connection between the battery units 100 (shown in fig. 1), the welding marks may result in poor flatness of the welding surface, resulting in poor flow guiding capability of the battery module or even failure in electrical conduction when the bus bar and the post 331 are welded, and the bus bar welding is not a detachable structure, and is in a fixed connection mode, the post 331 and the post ring 333 are damaged after the welding failure, only the battery 1000 can be scrapped, and the battery modules are welded to each other through the bus bar, and all the battery modules are electrically tested after the battery modules are assembled, once the welding failure occurs, the whole battery module is scrapped, and the cost loss is extremely high, so that the post ring protrudes out of the post 331, the post ring 333 moves down at the welding position of the post ring 333, the post 331 and the bus bar welding position is a flat surface, the reliability of the post 331 and the post ring 333 is guaranteed, the production cost is improved, and the production cost is increased.

More specifically, referring to fig. 6 and 7, in some embodiments, a receiving groove 3333 is formed on an inner edge of the pole ring 333 adjacent to the pole 331, and a bottom surface 3335 of the receiving groove 3333 is flush with a top surface 3311 of the pole 331.

The inner edge of the pole ring 333, which is close to the pole 331, is provided with a receiving groove 3333, and the bottom surface 3335 of the receiving groove 3333 is flush with the top surface 3311 of the pole 331, so that a height difference can be formed between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331, and the depth of the space where the height difference is located can be equal. When the pole ring 333 is welded on the pole 331, on one hand, the space where the height difference is located can accommodate welding slag and/or welding seam, etc., so that the final welding seam is prevented from protruding out of the top surface 3331 of the pole ring 333 to jack up the busbar, the stability of the penetration width of the welding seam is ensured, and the connection strength, the electrical connection stability and the overcurrent capacity of the terminal assembly 33 are further ensured; on the other hand, the depth of the space where the height difference is located is equal everywhere, so that the stability of the penetration width of the final welding line can be further ensured, the flatness of the upper surface of the final welding line is improved, and the stability can be increased when the busbar is welded.

Referring to fig. 4 and 7, in some embodiments, a protrusion 3315 is provided at an upper end of the pole 331, and a pole ring 333 is carried by the protrusion 3315.

The upper end of the pole 331 is an end protruding from the side of the top cover 31 where the first face 311 is located to the outside of the case 10. The protrusion 3315 is a step formed to protrude from the body portion of the pole 331, and the protrusion 3315 protrudes from the side of the top cap 31 where the first face 311 is located.

In the top cover structure 30 of the present embodiment, the protruding portion 3315 is disposed at the upper end of the pole 331, and before the pole ring 333 is welded to the pole 331, the pole ring 333 can be carried by the protruding portion 3315, so as to facilitate welding the pole ring 333 to the upper end of the pole 331.

Referring to fig. 4 and 5, in some embodiments, the pole 331 includes a connecting post 3316 and a flange 3317, the post 3316 is provided with a through hole 314, and the flange 3317 protrudes from the side of the second surface 313; the insulating assembly 34 includes a first insulating member 35, a second insulating member 37, and a sealing member 39. The first insulating member 35 is mounted on the top cover 31 and protrudes relative to the first surface 311 of the top cover 31, that is, the first insulating member 35 is mounted on the side of the first surface 311 of the top cover 31, and the first insulating member 35 is sandwiched between the top cover 31 and the pole ring 333. The second insulator 37 is mounted on the side of the second surface 313 of the top cover 31, and the second insulator 37 is sandwiched between the top cover 31 and the pole 331. Referring to fig. 6 and 7, the sealing member 39 surrounds the column 3316, the sealing member 39 is disposed between the top cover 31 and the flange portion 3317 in the thickness direction Z of the top cover 31, and the sealing member 39 is disposed between the column 3316 and the second insulating member 37 in the radial direction of the column 3316.

The first insulating member 35 and the second insulating member 37 are members provided on the top cover 31 to perform an electric insulating function, and the first insulating member 35 and the second insulating member 37 are each made of an insulating material such as plastic, resin, rubber, or the like. The first insulator 35 is located on the side of the first surface 311 of the top cover 31 for carrying the pole ring 333. The second insulator 37 is located on the side of the second face 313 of the top cap 31.

The sealing member 39 is located between the post 3316 and the second insulating member 37, and can prevent the electrolyte from entering the gap between the post 3316 and the second insulating member 37, so as to prevent the electrolyte from leaking from the gap between the post 331 and the top cover 31 to the outside of the casing 10, and at the same time, for the negative electrode post 331, it can also prevent the electrolyte from soaking the composite interface 3319 of the post 3316 to cause chemical corrosion of the composite interface 3319, thereby ensuring good electrical connection performance of the negative electrode terminal assembly 33B.

In the top cover structure 30 of the present embodiment, the first insulating member 35 is sandwiched between the top cover 31 and the pole ring 333 to electrically insulate between the top cover 31 and the pole ring 333, and the second insulating member 37 is sandwiched between the top cover 31 and the pole 331 to electrically insulate between the top cover 31 and the pole 331, so that the risk of conducting and shorting between the top cover 31 and the terminal assembly 33 can be reduced.

When the top cover structure 30 is assembled, the post 3316 of the pole 331 is sleeved with the second insulating member 37 and the sealing member 39, passes through the top cover 31, then is sleeved with the first insulating member 35 and the pole ring 333, presses the pole ring 333 by a tool to compress the sealing member 39, and then enables the pole ring 333 to be welded and connected with the pole 331 by laser welding, thus completing the whole assembly process. Therefore, the whole assembly process is simplified into a welding process, the efficiency is high, the cost is low, and the safety is high.

In addition, compared with the top surface 3311 of the pole 331, the top surface 3331 of the pole ring 333 is protruded, so that an image sensor can be conveniently used to capture an image to detect the height from the pole ring 333 to the bottom surface 3312 of the pole 331, and the height size can represent the compression amount (compressed amount) of the sealing member 39, so that the stability and consistency of the compression amount of the sealing member 39 in the assembly process of the top cover structure 30 are improved, and the leakage caused by the failure of the sealing due to the over-pressure or insufficient compression amount of the sealing member 39 in long-term use is avoided.

In some embodiments, the first insulator 35 is made using an injection molding process.

In the top cover structure 30 of the present embodiment, since the first insulating member 35 is made by injection molding, the first insulating member 35 can be produced by one mold with multiple cavities, which can not only improve the production efficiency of the first insulating member 35, but also reduce the production cost of the first insulating member 35.

Specifically, referring to fig. 4, in some embodiments, the first insulating member 35 includes an insulating body 355 and a ring-shaped first insulating cylinder 357 extending from a first side of the insulating body 355, and the pole ring 333 is mounted in a cavity defined by the first insulating cylinder 357 and the insulating body 355, and a top surface 3331 of the pole ring 333 protrudes from the top surface of the first insulating cylinder 357 by 0.3mm to 0.5mm.

The top surface 3331 of the pole ring 333 protrudes 0.3mm-0.5mm beyond the top surface of the first insulating cylinder 357, heat is conducted to the first insulating member 35 during the use of the battery 1000 (shown in fig. 20), the first insulating member 35 is usually a plastic member made by injection molding process, the thermal expansion may have an abutting process with a busbar, the busbar is formed by stacking and extruding a plurality of aluminum thin plates, the abutting process of the injection molding member and the busbar generates friction during the displacement process of the respiratory expansion of the battery 1000, the friction generates metal aluminum fragments, and the metal aluminum fragments fall to certain electric connection positions of the battery 1000 (shown in fig. 20) to form an electric circuit, thereby causing electric short circuit, and a certain safety risk of the battery 1000 exists. Therefore, the top surface 3331 of the pole ring 333 protrudes 0.3mm-0.5mm beyond the top surface of the first insulating cylinder 357 to reserve an expansion space for the first insulating member 35, so as to avoid friction and metal debris generated when the first insulating member 35 jacks up the bus bar after expansion, thereby resulting in a safety risk of the battery 1000.

Referring to fig. 6 and 7, in some embodiments, the first insulating member 35 is disposed through the top cover 31, and the bottom surface 353 of the first insulating member 35 protrudes relative to the second surface 313 of the top cover 31.

Specifically, the first insulator 35 includes an insulator body 355, an annular first insulator cylinder 357, and an annular second insulator cylinder 359, the first insulator cylinder 357 and the second insulator cylinder 359 extending from opposite sides of the insulator body 355, respectively. The insulator 355 and the first insulator sleeve 357 form a first cavity for carrying the pole collar 333. The insulator 355 and the second insulating cylinder 359 form a second cavity, the insulator 355 is carried on the first surface 311 of the top cover 31, and the first insulating cylinder 357 is located on the side of the first surface 311 of the top cover 31. The second insulating cylinder 359 is threaded through the top cover 31, and the pole 331 is threaded through the second insulating cylinder 359 and extends from the second cavity into the first cavity to thread through the pole collar 333 located in the first cavity. The bottom surface 353 of the first insulating member 35 is a surface of the second insulating cylinder 359 (the bottom surface 353 of the first insulating cylinder 357) away from the insulating body 355, and since the bottom surface 353 of the first insulating cylinder 357 protrudes relative to the second surface 313 of the top cover 31, the second insulating cylinder 359 can prevent external impurities from contacting the pole 331 penetrating the second cavity, for example, the risk of leakage of the top cover 31 caused by conduction between the top cover 31 and the terminal assembly 33 due to conductive metal filings remained in the manufacturing process of the top cover 31 can be avoided.

Referring to fig. 3 to 5, in some embodiments, the pole 331 includes a post 3316 and a flange 3317, the post 3316 is inserted through the top cover 31, and the flange 3317 protrudes from a side of the top cover 31 where the second surface 313 is located. The second surface 313 of the top cover 31 is provided with a first shaped groove 315, and a side of the second insulating member 37 facing the top cover 31 is provided with a shaped protrusion 371, and the protrusion 371 is accommodated in the first groove 315 and is matched with the first groove 315. The side of the second insulating member 37 away from the top cover 31 is provided with a second groove 373, and the flange portion 3317 is accommodated in the second groove 373 and cooperates with the second groove 373.

The profiled protrusion 371 on the second insulator 37 is engaged with the first groove 315 on the top cover 31, and the flange 3317 of the pole 331 is engaged with the second groove 373 on the second insulator 37, so that the torsional strength of the pole 331 can be improved, the height of the terminal assembly 33 can be reduced, and the installation space for installing other components in the battery cell 100 can be increased. It should be noted that the cross-sectional shape of the flange 3317 may be a special shape, and correspondingly, the cross-sectional shape of the second groove 373 may be a special shape, so that the alignment and installation are convenient.

Referring to fig. 6 and 7, as described above, the electrode post 331 (negative electrode post 331) is formed with a copper-aluminum composite interface 3319, and a distance D1 between the composite interface 3319 and the first surface 3318 of the flange portion 3317 facing the top cap 31 is greater than a distance D2 between the bottom surface 353 of the first insulating cylinder 357 and the first surface 3318 of the flange portion 3317 in a direction from the second surface 313 of the top cap 31 to the first surface 311 of the top cap 31.

The distance D1 between the composite interface 3319 and the first surface 3318 of the flange portion 3317 is greater than the distance D2 between the bottom surface 353 of the first insulating cylinder 357 and the first surface 3318 of the flange portion 3317, so that the composite interface 3319 is prevented from being located below the bottom surface 353 of the first insulating cylinder 357, i.e., the composite interface 3319 is prevented from being immersed in the electrolyte to cause chemical corrosion, thereby ensuring good electrical connection performance of the terminal assembly 33.

Specifically, in certain embodiments, the composite interface 3319 projects 0.1mm to 0.8mm from the first surface 3318 of the flange portion 3317. That is, the distance D1 is in the range of [0.1mm,0.8mm ], for example, the distance D1 is any one value of 0.10mm, 0.21mm, 0.23mm, 0.34mm, 0.45mm, 0.56mm, 0.67mm, 0.70mm, 0.79mm or 0.80mm, or any value between any two values.

If the protrusion of the composite interface 3319 is less than 0.1mm, i.e., the distance D1 < 0.1mm, with respect to the first surface 3318 of the flange portion 3317, the composite interface 3319 may be below the bottom surface 353 of the first insulation cylinder 357 or, although not below the bottom surface 353 of the first insulation cylinder 357, may be not far from the first surface 3318 of the flange portion 3317, and thus the electrolyte may be soaked into the composite interface 3319 to cause chemical corrosion. If the protrusion of the composite interface 3319 is greater than 0.8mm, i.e., the distance D1 is greater than 0.8mm, relative to the first surface 3318 of the flange portion 3317, the composite interface 3319 is ensured not to be immersed in the electrolyte solution and to be chemically corroded, so that good electrical connection performance of the terminal assembly 33 is ensured, but the amount of copper material is relatively large, and the cost of the terminal assembly 33 is relatively high. Therefore, the composite interface 3319 protrudes 0.1mm to 0.8mm from the first surface 3318 of the flange portion 3317, so that the composite interface 3319 is not immersed in the electrolyte to generate chemical corrosion, thereby ensuring good electrical connection performance of the terminal assembly 33; on the other hand, the consumption of copper materials can be saved, and the cost of the terminal assembly 33 can be reduced.

Referring to fig. 8 to 11, a top cover structure 30 of a battery cell 100 (shown in fig. 1) according to other embodiments of the present application is shown, wherein the top cover structure 30 according to the embodiment of the present application is substantially the same as the top cover structure 30 shown in fig. 2 to 7, and is different in that:

Referring to fig. 10 and 11, in some embodiments, the top surface 3311 of the pole 331 is convex compared to the top surface 3331 of the pole ring 333.

The top surface 3311 of the post 331 is protruded compared to the top surface 3331 of the post ring 333, i.e., please refer to fig. 1, in the height direction H of the battery cell 100, the top surface 3311 of the post 331 is higher than the top surface 3331 of the post ring 333. In this way, a height difference can be formed between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331, and when the pole ring 333 is welded on the pole 331, the space where the height difference is located can accommodate welding slag and/or welding seam, so as to avoid the final welding seam protruding out of the top surface 3311 of the pole 331 to jack up the busbar, ensure the stability of the penetration width of the welding seam, and further ensure the connection strength, electrical connection stability and overcurrent capability of the terminal assembly 33.

More specifically, with continued reference to fig. 10 and 11, in some embodiments, the side edges of the pole 331 are recessed from the top surface 3311 of the pole 331 toward the bottom surface 3312 of the pole 331 to form a stepped surface 3313, the stepped surface 3313 being flush with the top surface 3331 of the pole ring 333.

The side edge of the pole 331 is recessed from the top surface 3311 of the pole 331 to the bottom surface 3312 of the pole 331 to form a step surface 3313, and the step surface 3313 is flush with the top surface 3331 of the pole ring 333, so that not only can a height difference be formed between the top surface 3331 of the pole ring 333 and the top surface 3311 of the pole 331, but also the depth of the space where the height difference is located can be equalized. When the pole ring 333 is welded on the pole 331, on one hand, the space where the height difference is located can accommodate welding slag and/or welding seam, etc., so that the final welding seam is prevented from protruding out of the top surface 3311 of the pole 331 to jack up the busbar, the stability of the penetration width of the welding seam is ensured, and the connection strength, the electrical connection stability and the overcurrent capacity of the terminal assembly 33 are further ensured; on the other hand, the depth of the space where the height difference is located is equal everywhere, so that the stability of the penetration width of the final welding line can be further ensured, the flatness of the upper surface of the final welding line is improved, and the stability can be increased when the busbar is welded.

Referring to fig. 10 and 11, in some embodiments, a first boss 317 is formed at a side of the pole ring 333 where the first face 311 of the top cover 31 is located, the first boss 317 is provided with a receiving groove 318, the first insulating member 35 is received in the receiving groove 318, and the pole ring 333 is received in the first insulating member 35.

The provision of the first boss 317 can reduce the height space of the interior of the battery cell 100 (shown in fig. 1) occupied by the terminal assembly 33 on the one hand, and can increase the pressure resistance and deformation resistance at the terminal assembly 33 on the other hand.

In some embodiments, the accommodating groove 318, the first insulating member 35 and the pole ring 333 are all shaped structures.

The accommodating groove 318, the first insulating member 35 and the pole ring 333 are all of a special-shaped structure, so that the first insulating member 35 is prevented from being put into the accommodating groove 318 and the pole ring 333 is prevented from being put into the first insulating member 35.

Referring to fig. 10 and 11, in some embodiments, a recess 319 surrounding the through hole 314 is formed at the pole ring 333 on the side of the second face 313 of the top cover 31, a second boss 375 is disposed on the side of the second insulating member 37 facing the top cover 31, the second boss 375 is received in the recess 319 and cooperates with the recess 319, and the second boss 375 is carried on the first surface 3318 of the flange 3317 of the pole 331. In the present embodiment, at the pole ring 333, the second face 313 of the top cap 31 is recessed toward the first face 311 of the top cap 31, and the first face 311 of the top cap 31 at the pole ring 333 is protruded with respect to other areas of the first face 311 of the top cap 31, so as to form the first boss 317 and the recess 319.

The second boss 375 of the second insulating member 37 is received in the recess 319 of the top cap 31 to reduce the height space inside the battery cell 100 occupied by the second insulating member 37; meanwhile, the second boss 375 of the second insulating member 37 is carried on the first surface 3318 of the flange portion 3317 of the pole 331, so that the second insulating member 37 can be ensured to be stably arranged between the pole 331 and the top cover 31, and the mounting stability is improved.

Referring to fig. 8 and 9, in some embodiments, the flange portion 3317 has a circular or square cross-sectional shape.

Compared with the special structure formed by punching the bottom of the pole, the cross section of the flange 3317 of the pole 331 is designed to be round or square, which can improve the utilization rate of materials in manufacturing the pole 331 and save the cost.

Referring to fig. 12 to 15, a top cover structure 30 of a battery cell 100 (shown in fig. 1) according to still other embodiments of the present application is shown, wherein the top cover structure 30 according to the embodiment of the present application is substantially identical to the top cover structure 30 shown in fig. 2 to 7, and is different from the top cover structure 30 shown in fig. 2 to 7 in that:

referring to fig. 14 and 15, in some embodiments, the top surface 3311 of the pole 331 is convex compared to the top surface 3331 of the pole ring 333.

More specifically, with continued reference to fig. 10 and 11, in some embodiments, the side edges of the pole 331 form a step surface 3313 from the top surface 3311 of the pole 331 to the bottom surface 3312 of the pole 331, the step surface 3313 being flush with the top surface 3331 of the pole ring 333.

In contrast to fig. 15 and fig. 7, the thickness of the insulating body 355 of the first insulating member 35 shown in fig. 15 is larger than the thickness of the insulating body 355 of the first insulating member 35 shown in fig. 7, and accordingly, the thickness of the pole ring 333 shown in fig. 15 is smaller than the thickness of the pole ring 333 shown in fig. 7, that is, in the case where the distance from the top surface 3331 of the pole ring 333 to the first surface 311 of the top cover 31 is the same, the thickness of the pole ring 333 of the top cover structure 30 of the embodiment of the present application is thinner, that is, the amount of material used for the pole ring 333 (aluminum material) is smaller, and it is possible to save more cost.

Referring to fig. 16 to 19, a top cover structure 30 of a battery cell 100 (shown in fig. 1) according to still other embodiments of the present application is shown, wherein the top cover structure 30 according to the embodiment of the present application is substantially identical to the top cover structure 30 shown in fig. 12 to 15, except that:

In contrast to fig. 19 and 15, the thickness of the insulating body 355 of the first insulating member 35 shown in fig. 19 is smaller than the thickness of the insulating body 355 of the first insulating member 35 shown in fig. 15, and accordingly, the thickness of the pole ring 333 shown in fig. 19 is larger than the thickness of the pole ring 333 shown in fig. 15, i.e., in the case where the distance from the top surface 3331 of the pole ring 333 to the first surface 311 of the top cover 31 is the same, the thickness of the pole ring 333 of the top cover structure 30 according to the embodiment of the application is thicker, i.e., the pole ring 333 is easier to be welded to the pole ring 331, and the connection strength of the two is stronger, thereby making the electrical connection performance of the terminal assembly 33 better.

Referring to fig. 20, in a third aspect, the present application provides a battery 1000, where the battery 1000 includes the battery cell 100 according to any one of the above embodiments.

The battery 1000 includes a case 300 and a battery cell 100, and the battery cell 100 is accommodated in the case 300. The case 300 is used to provide an accommodating space for the battery cell 100, and the case 300 may have various structures. In some embodiments, the case 300 may include a first portion 301 and a second portion 303, the first portion 301 and the second portion 303 being overlapped with each other, the first portion 301 and the second portion 303 together defining an accommodating space for accommodating the battery cell 100. The second portion 303 may be a hollow structure with one end opened, the first portion 301 may be a plate-shaped structure, and the first portion 301 covers the opening side of the second portion 303, so that the first portion 301 and the second portion 303 together define an accommodating space; the first portion 301 and the second portion 303 may also be hollow structures with one side open, and the open side of the first portion 301 is covered with the open side of the second portion 303. Of course, the case 300 formed by the first portion 301 and the second portion 303 may be of various shapes, such as a cylinder, a rectangular parallelepiped, or the like.

In the battery 1000, the number of the battery cells 100 may be plural, and the plural battery cells 100 may be connected in series, parallel, or series-parallel, where series-parallel refers to both of the plural battery cells 100 being connected in series and parallel. The plurality of battery cells 100 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 100 is accommodated in the box 300; of course, the battery 1000 may be a form of a plurality of battery cells 100 connected in series or parallel or series-parallel to form a battery 1000 module, and a plurality of battery 1000 modules connected in series or parallel or series-parallel to form a whole and accommodated in the case 300. The battery 1000 may further include other structures, for example, the battery 1000 may further include a bus bar member for making electrical connection between the plurality of battery cells 100.

Referring to fig. 7, in the top cover structure 30 of the battery 1000 according to the embodiment of the application, the terminal assembly 33 includes the post 331 and the post ring 333 with separate structures, and the post ring 333 is a single structure made of the same material, and when assembling, the post ring 333 is sleeved and welded on the portion of the post 331 protruding from the first surface 311 of the top cover 31, and no injection molding encapsulation process is required for assembling, so that the post 331 will not sink due to high temperature baking in the subsequent high temperature baking process, thereby avoiding the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the post 331.

Referring to fig. 21, in a fourth aspect, the present application provides an electric device, where the electric device includes a battery 1000 according to any one of the embodiments described above.

The battery cell 100 disclosed in the present application may be used for electric devices using the battery 1000 as a power source or various energy storage systems using the battery 1000 as an energy storage element. The powered device may be, but is not limited to, a cell phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft, or the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes (including unmanned aerial vehicles), rockets, space planes, and spacecraft, and the like.

The present application is described by taking electric equipment as an example of a vehicle 10000, referring to fig. 21, fig. 21 is a schematic structural diagram of the vehicle 10000 according to some embodiments of the present application. The vehicle 10000 can be a fuel oil vehicle, a fuel gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle or a range-extended vehicle. The battery 1000 is provided inside the vehicle 10000, and the battery 1000 may be provided at the bottom, the head, or the tail of the vehicle 10000. The battery 1000 may be used for power supply of the vehicle 10000, for example, the battery 1000 may be used as an operation power source of the vehicle 10000. The vehicle 10000 can also include a controller 2000 and a motor 3000, the controller 2000 being configured to control the battery 1000 to power the motor 3000, for example, for operating power requirements during starting, navigation and driving of the vehicle 10000.

In some embodiments of the application, battery 1000 may not only serve as an operating power source for vehicle 10000, but also as a driving power source for vehicle 10000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 10000.

Referring to fig. 7, in the top cover structure 30 of the battery 1000 of the electric device according to the embodiment of the application, the terminal assembly 33 includes the post 331 and the post ring 333 with separate structures, and the post ring 333 is a single structure with the same material, and when assembling, the post ring 333 is sleeved and welded on the portion of the post 331 protruding from the first surface 311 of the top cover 31, and the assembly is not performed by using an injection molding encapsulation process, so that the post 331 will not sink due to high temperature baking in the subsequent high temperature baking process, thereby avoiding the problems of electrolyte leakage and/or poor busbar welding caused by the sinking of the post 331.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limited thereto; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the application, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. It is intended that the application not be limited to the particular embodiments disclosed herein, but that the application will include all embodiments falling within the scope of the appended claims.

Claims

1. A top cap structure of a battery cell, comprising:

A top cover including a first face and a second face opposite to each other in a thickness direction, and provided with a through hole penetrating the first face and the second face;

The terminal assembly comprises a pole and a pole ring, the pole penetrates through the through hole and protrudes from the first surface and the second surface, the pole ring is sleeved and welded on the part, protruding out of the first surface, of the pole, and the outer contour size of the pole ring is larger than the size of the through hole; and

And the insulation assembly is arranged between the top cover and the terminal assembly and is used for electrically insulating the top cover from the terminal assembly.

2. The top cover structure of claim 1, wherein there is a height difference between the top surface of the pole collar and the top surface of the pole.

3. The roof structure of claim 2, wherein the height difference has a value in the range of 0.1mm,1.0 mm.

4. The roof structure of claim 2, wherein,

The top surface of the pole is protruded compared with the top surface of the pole ring; or (b)

The top surface of the pole ring is convex compared with the top surface of the pole.

5. The top cover structure according to claim 2, wherein an inner side edge of the pole ring, which is close to the pole, is provided with a receiving groove, and a bottom surface of the receiving groove is flush with a top surface of the pole.

6. The top cover structure of claim 2, wherein the side edges of the pole are recessed from the top surface of the pole toward the bottom surface of the pole to form a stepped surface that is flush with the top surface of the pole collar.

7. The header structure of claim 1, wherein the post is formed using a stamping or cold heading process.

8. The top cover structure according to claim 1, wherein the upper end of the pole is provided with a projection, and the pole ring is carried by the projection.

9. The top cover structure according to any one of claims 1 to 8, wherein the pole includes a connected column body and a flange portion, the column body penetrating the through hole, the flange portion protruding from a side where the second face is located; the insulation assembly includes:

The first insulating piece is arranged on one side where the first surface is located, and is clamped between the top cover and the pole ring;

The second insulating piece is arranged on one side where the second surface is located, and the second insulating piece is clamped between the top cover and the pole; and

And a sealing member surrounding the column, the sealing member being provided between the top cover and the flange portion in a thickness direction of the top cover, and the sealing member being provided between the column and the second insulating member in a length direction of the top cover.

10. The header structure of claim 9, wherein the first insulator is formed by an injection molding process.

11. The roof structure of claim 9, wherein the first insulator comprises an insulator body and a ring-shaped first insulator tube extending from a first side of the insulator body, the pole ring is mounted in a cavity defined by the first insulator tube and the insulator body, a top surface of the pole ring protrudes from a top surface of the first insulator tube, and the top surface of the pole ring protrudes from the top surface of the first insulator tube by 0.3mm to 0.5mm.

12. The roof structure of claim 9, wherein the first insulator includes an insulator body and a second insulator cylinder extending from a second side of the insulator body, the second insulator cylinder passing through the through hole and being located between the post and an inner sidewall of the through hole, a bottom surface of the second insulator cylinder protruding relative to the second surface.

13. The roof structure of claim 9, wherein a side of the second face is provided with a first groove surrounding the through hole, a side of the second insulating member facing the roof is provided with a protrusion, the protrusion is accommodated in the first groove and is matched with the first groove, a side of the second insulating member far away from the roof is provided with a second groove, and the flange portion is accommodated in the second groove and is matched with the second groove.

14. The roof structure of claim 9, wherein the pole has a copper-aluminum composite interface, and a distance between the composite interface and a first surface of the flange portion facing the roof in a direction from the second face to the first face is greater than a distance between a bottom surface of a second insulating cylinder of the first insulating member and the first surface.

15. The header structure of claim 14, wherein the composite interface projects from 0.1mm to 0.8mm relative to the first surface.

16. The top cover structure according to claim 9, wherein a first boss surrounding the through hole is formed on a side where the first surface is located, the first boss is provided with a containing groove surrounding the through hole, the first insulating member is contained in the containing groove, the pole ring is contained in the first insulating member, and the containing groove, the first insulating member and the pole ring are all of special-shaped structures.

17. The roof structure of claim 16, wherein a recess surrounding the through hole is formed on a side of the second face, a second boss is disposed on a side of the second insulating member facing the roof, the second boss is accommodated in the recess and cooperates with the recess, and the second boss is carried on the first surface of the flange portion.

18. A battery cell comprising the cap structure of any one of claims 1-17.

19. A battery comprising the cell of claim 18.

20. A powered device comprising the battery of claim 19, the battery configured to provide electrical energy.