CN116845250A - Battery end cover, battery, electric equipment and preparation method of battery end cover - Google Patents

Battery end cover, battery, electric equipment and preparation method of battery end cover Download PDF

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Publication number
CN116845250A
CN116845250A CN202310969906.3A CN202310969906A CN116845250A CN 116845250 A CN116845250 A CN 116845250A CN 202310969906 A CN202310969906 A CN 202310969906A CN 116845250 A CN116845250 A CN 116845250A
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CN
China
Prior art keywords
pole
battery
tab
hole
pole body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310969906.3A
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Chinese (zh)
Inventor
高翔
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chongqing Talent New Energy Co Ltd
Original Assignee
Chongqing Talent New Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chongqing Talent New Energy Co Ltd filed Critical Chongqing Talent New Energy Co Ltd
Priority to CN202310969906.3A priority Critical patent/CN116845250A/en
Publication of CN116845250A publication Critical patent/CN116845250A/en
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing

Abstract

The invention discloses a battery end cover, a battery, electric equipment and a preparation method thereof, wherein the battery end cover comprises an end cover main body, and the end cover main body is provided with a first through hole penetrating through the end cover main body along a first direction; the battery comprises at least one pole, the pole is connected in the first through hole, a pole lug connecting cavity is arranged in the battery end cover, the pole lug connecting cavity comprises a first pole lug containing cavity extending along a first direction and a second pole lug containing cavity extending along a second direction and communicated with the first pole lug containing cavity, the first pole lug containing cavity and the second pole lug containing cavity are configured to contain an electric core pole lug to be electrically connected with the pole, and the first direction and the second direction are intersected. The volume energy density of the battery can be improved by the scheme.

Description

Battery end cover, battery, electric equipment and preparation method of battery end cover
Technical Field
The invention belongs to the technical field of batteries, and particularly relates to a battery end cover, a battery, electric equipment and a preparation method of the battery end cover.
Background
The lithium ion battery has the advantages of light weight, high energy, long service life, high safety performance and the like, and has been widely used for consumer electronic products, electric automobiles, energy storage power stations and the like.
Currently, lithium ion batteries are classified according to commodity types, and can be classified into cylindrical batteries, square batteries, and soft-pack batteries. Wherein, the outer shell of the cylindrical battery and the square battery is a stainless steel shell or an aluminum shell.
The existing processing technology of the cylindrical battery and the square battery can be that a bare cell is inserted into a shell, and then a foil tab on the bare cell is welded on a pole of an end cover. In order to facilitate welding the foil tab onto the electrode post, the foil tab needs to extend a sufficient length from the inside of the housing, or a transfer tab (also referred to as a transfer electrical connector or the like) is connected to the foil tab, after the foil tab or the transfer tab is welded onto the electrode post of the end cover, the end cover is turned over and welded onto the opening of the housing, in this process, the foil tab or the transfer tab is deformed in a skewed manner, in order to prevent the foil tab or the transfer tab from being bent and contacting the housing to cause leakage, a large distance needs to be left between the end cover and the end part of the bare cell, and the foil tab or the transfer tab is used as a buffer layer area for deformation, because a large distance is left between the end cover and the end part of the bare cell, which can negatively affect the volumetric energy density of the battery.
Disclosure of Invention
In view of the foregoing drawbacks or shortcomings of the prior art, it is desirable to provide a battery end cap, a battery, a powered device, and a method of making the same, at least for increasing the volumetric energy density of the battery.
In a first aspect, the present invention provides a battery end cap comprising:
the end cover comprises an end cover body, a first connecting piece and a second connecting piece, wherein the end cover body is provided with a first through hole penetrating through the end cover body along a first direction;
the battery comprises at least one pole, the pole is connected in the first through hole, a pole lug connecting cavity is arranged in the battery end cover, the pole lug connecting cavity comprises a first pole lug containing cavity extending along a first direction and a second pole lug containing cavity extending along a second direction and communicated with the first pole lug containing cavity, the first pole lug containing cavity and the second pole lug containing cavity are configured to contain an electric core pole lug to be electrically connected with the pole, and the first direction and the second direction are intersected.
As an implementation manner, the pole comprises a first pole body and a second pole body, the first pole body is arranged at the inner side end of the first through hole, the second pole body is arranged at the outer side end of the first through hole, and the second pole body is in sealing fit with the end cover main body.
As an achievable manner, the first tab cavity is formed between the first pole body and the end cover main body, or is formed in the first pole body; and/or the number of the groups of groups,
the second lug cavity is positioned between the first pole body and the second pole body or between the second pole body and the sealing structure of the end cover main body.
As an implementation manner, a protruding limiting portion is arranged in the first through hole, so that the first pole body abuts against the limiting portion to limit in the direction from outside to inside from the first through hole.
As an implementation manner, the first through hole comprises a stepped through hole, the limiting part is a step part of the stepped through hole, and at least part of the first pole body is arranged at the step part of the first through hole; the second pole body is arranged on one side of the first pole body, which is away from the small-diameter section of the first through hole; or alternatively, the process may be performed,
the first through hole comprises a conical hole, the limiting part is a conical surface structure which is contracted from the first through hole in the direction from outside to inside, and at least part of the first pole body is limited at the conical surface structure of the first through hole.
As an realizable mode, the first pole body is provided with a second through hole, the second through hole is used as the first pole lug accommodating cavity, the second pole lug accommodating cavity is arranged between the first pole body and the second pole body, and the first pole lug accommodating cavity is used for allowing the battery cell pole lug to penetrate through and bending the battery cell pole lug to the second pole lug accommodating cavity.
As an implementation manner, the second pole body is a conductive piece and is used for being electrically connected with the battery cell tab at the second pole tab accommodating cavity; the first pole body is an insulating piece, a conducting piece or a conducting piece is embedded in the top.
As an implementation manner, the first through hole is a stepped through hole, the polar post comprises a first polar post body and a second polar post body which are electrically connected with each other, and at least part of the first polar post body is arranged at a step of the first through hole; the second pole body is arranged on one side of the small-diameter section of the first pole body, which is away from the first through hole, and the second pole body is in sealing fit with the end cover main body; the first pole body is provided with a second through hole corresponding to the small-diameter section, the second through hole is used as the first pole lug cavity, and the second pole lug cavity is arranged between the first pole body and the second pole body.
As an implementation manner, the first pole body and the second pole body of at least one pole body are respectively in insulating fit with the end cover main body.
As an implementation manner, a groove is formed in one side, facing the second pole body, of the first pole body, and the end faces, facing the groove, of the groove and the second pole body are formed to serve as the second pole lug accommodating cavity; or alternatively, the process may be performed,
A groove is formed in one side, facing the first pole body, of the second pole body, and the end faces, facing the groove, of the groove and the first pole body are used as second lug accommodating cavities; or alternatively, the process may be performed,
a groove is formed in one side, facing the second pole body, of the first pole body, and another groove is formed in one side, facing the first pole body, of the second pole body, and the two grooves jointly form the second lug accommodating cavity; or alternatively, the process may be performed,
the first pole body is provided with a notch at one side of the first pole lug accommodating cavity, the notch enables the battery cell pole lug to be positioned between the second pole body and the end cover main body, and the notch, the end face of the second pole body facing the end cover main body and the end face of the end cover main body facing the second pole body form the second pole lug accommodating cavity; or alternatively, the process may be performed,
the first pole body is provided with a groove towards one side of the end cover main body, and the groove and the end surface of the end cover main body, which faces the first pole body, form the second pole ear accommodating cavity.
As an implementation manner, the battery end cover further comprises a sealing and pressing piece, a third through hole is formed in the sealing and pressing piece, a part of the second pole body is installed in the third through hole in a penetrating mode, the second pole body is in insulating fit with the sealing and pressing piece, the sealing and pressing piece is fixedly connected to a large-diameter section of the first through hole, and the sealing and pressing piece is in press fit with the second pole body in a direction facing the first pole body.
A first seal is disposed between the end cap body and the first and second pole bodies.
As an implementation manner, the first tab cavity and the second tab cavity are adjacent to the end cover main body, and the positions of the end cover main body corresponding to the first tab cavity and the second tab cavity are respectively provided with the insulated first sealing piece.
As an implementation manner, the first sealing element comprises a first sealing piece, a first sealing sleeve is connected to the first sealing piece, the first sealing piece covers the end face, away from the second pole body, of the end cover main body, and the first sealing sleeve covers at least part of the area of the inner wall of the first through hole in a conformal manner.
As an implementation manner, the large-diameter section of the first through hole is exposed to the first sealing sleeve at a position close to the orifice.
As an achievable mode, the large-diameter section of the first through hole is provided with an inward bulge at a position close to the orifice, and the inner side surface of the bulge is flush with the inner side surface of the large-diameter section of the first sealing sleeve.
As an implementation manner, the first pole body comprises a first conductive matrix, the first conductive matrix is connected with a first conductive column, and the first lug cavity penetrates through the first conductive matrix and the first conductive column; the first conductive column is inserted into the small-diameter section of the first sealing sleeve.
As an implementation manner, a second sealing piece is arranged between the sealing piece and the second pole body, and the second sealing piece is tightly attached to the first sealing piece, so that the pole body is sealed in the first through hole.
As an implementation manner, the second pole body comprises a second conductive matrix, and the second conductive matrix is connected with a second conductive pole; the second sealing piece comprises a second sealing sheet, and a second sealing sleeve is connected to the second sealing sheet; the second conductive column penetrates through the second sealing sleeve, and the second sealing piece covers the second conductive matrix; the second sealing sleeve penetrates through the third through hole, and the sealing pressing piece is in press fit with the second sealing piece.
As an implementation manner, one end of the second conductive post protrudes out of the second sealing sleeve.
As an implementation manner, the inner end face of the second sealing member is flush with the outer end face of the first sealing member or is staggered with each other.
In a second aspect, the present invention provides a battery comprising a housing, wherein at least one battery end cap described above is connected to the housing;
a bare cell encapsulated within the housing, the bare cell comprising at least one first tab and at least one second tab;
At least one of the first lug and the second lug penetrates through the second through hole, the end part of the first lug and the second lug is exposed out of the second through hole and is fixed in the second lug accommodating cavity, and the lug is electrically connected with the corresponding pole.
As an implementation manner, the battery comprises one battery end cover, wherein the battery end cover is provided with two polar posts;
the first electrode lug and the second electrode lug are positioned at the same end of the bare cell;
the first tabs and the second tabs are correspondingly penetrated in the corresponding first tab accommodating cavities one by one, the end parts of the first tabs are exposed out of the corresponding first tab accommodating cavities and are fixed in the corresponding second tab accommodating cavities, and the tabs are electrically connected with the corresponding pole posts.
As an implementation manner, two opposite ends of the shell are respectively provided with one battery end cover, and each battery end cover is provided with one pole;
the first electrode lug and the second electrode lug are positioned at two opposite ends of the bare cell;
the first tabs and the second tabs are correspondingly penetrated in the corresponding first tab accommodating cavities one by one, the end parts of the first tabs are exposed out of the corresponding first tab accommodating cavities and are fixed in the corresponding second tab accommodating cavities, and the tabs are electrically connected with the corresponding pole posts.
As an implementation manner, the integrated structure comprises a plurality of first tabs and a plurality of second tabs, wherein the first tabs and the second tabs are respectively connected into an integrated structure, the integrated structures are correspondingly penetrated in the corresponding first tab accommodating cavities one by one, the end parts of the integrated structures are exposed out of the corresponding first tab accommodating cavities and are fixed in the corresponding second tab accommodating cavities, and the tabs are electrically connected with the corresponding poles.
As an implementation manner, the first tab and the second tab are foil tabs integrally connected with corresponding pole pieces of the bare cell respectively.
In a third aspect, the present invention provides an electric device, including the battery described above.
In a fourth aspect, the present invention provides a method for preparing a battery, comprising the steps of:
preparing an end cover main body and a bare cell: the battery end cover comprises an end cover main body, a battery end cover and a battery cover, wherein the end cover main body is provided with a first through hole penetrating through the end cover main body along a first direction, the end cover main body is provided with at least one pole column, the pole column is connected in the first through hole, a pole lug connecting cavity is arranged in the battery end cover, the pole lug connecting cavity comprises a first pole lug containing cavity extending along the first direction and a second pole lug containing cavity extending along a second direction and communicated with the first pole lug containing cavity, and the first direction and the second direction are intersected;
The bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
In a fifth aspect, the present invention provides a method for preparing a battery using the battery end cap, including the steps of:
preparing an end cover main body and a bare cell;
the bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
As an implementation manner, the connection between the bare cell and the cover plate includes:
connecting the first pole body to a stepped hole or a small-diameter section of a tapered hole of the first through hole of the end cover main body;
extending a tab of a bare cell from the first tab cavity formed in the first pole body or between the first pole body and the end cover main body to one side of the first pole body, which is far away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
and arranging the second pole body on the large-diameter section of the stepped hole or the conical hole of the first through hole, so that the bent pole lug is pressed by the first pole body and the second pole body, and the second pole body is electrically connected with the first pole lug.
As an implementation manner, after the step of bending the tab to a side facing the second tab cavity, the bent tab is fixedly connected and/or electrically connected with the first tab post.
As an implementation manner, the connection between the bare cell and the cover plate includes:
extending a tab of a bare cell from the first tab cavity between the first pole body and the end cover main body to one side of the end cover main body, which is far away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
connecting the first pole body with a small-diameter section of a stepped hole or a conical hole of the first through hole of the end cover main body, so that part of the structure of the first pole body is pressed on the bent pole lug;
and arranging the second pole body on the large-diameter section of the stepped hole or the conical hole of the first through hole so as to realize the electric connection between the second pole body and the first pole body and between the second pole body and the first pole ear.
As an implementation manner, the first electrode lug and the second electrode lug are respectively arranged on two opposite sides of the bare cell, and openings are respectively arranged on two opposite sides of the shell of the battery;
one tab of the first tab and the second tab of the bare cell is connected with the cover plate outside the shell, and the other tab is connected with the cover plate inside the shell; or the first tab and the second tab of the bare cell are connected with the cover plate in the shell.
As an implementation manner, the sealing and pressing pieces are respectively and hermetically arranged on the two second pole bodies, and each sealing and pressing piece is fixedly connected with the corresponding end cover main body, and each end cover main body is respectively and fixedly connected with the shell.
As an achievable way, the battery end cover is provided with two pole posts; a first electrode lug and a second electrode lug are arranged on the same side of the bare cell;
the first electrode lug and the second electrode lug of the bare cell are both connected with the cover plate outside the shell; or the first tab and the second tab of the bare cell are connected with the cover plate in the shell.
As an implementation manner, the sealing and pressing pieces are respectively and hermetically arranged on the two second pole bodies, and each sealing and pressing piece is fixedly connected with the end cover main body, and the end cover main body is fixedly connected with the shell.
Above-mentioned scheme, can pass the corresponding electric core tab of naked electric core behind the first tab appearance chamber, bend and connect at the second tab appearance chamber, then, weld the end cover main part on the casing again, compare in prior art, because there is not the shielding that the casing caused when electric core tab is connected with first polar cylinder, consequently, naked electric core can be as far as possible be close to the end cover main part, with reduce the distance between end cover main part and the naked electric core, make under the same circumstances of naked electric core volume, the volume of the battery of this scheme is less than the volume of the battery of prior art, accordingly, this scheme has improved the volume energy density of battery.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
fig. 1 is a sectional view showing a use state of a battery end cap according to a first embodiment of the present application;
FIG. 2 is an exploded view of FIG. 1;
fig. 3 is a front view of a battery end cap according to a first embodiment of the present application without a second post;
fig. 4 is a front view of a battery end cap according to a first embodiment of the present application, in which a first tab or a second tab is connected to a first pole body;
fig. 5 is a front view of a battery end cap provided in accordance with a first embodiment of the present application;
fig. 6 is a sectional view showing a use state of a battery end cap according to a second embodiment of the present application;
fig. 7 is a sectional view showing a use state of a battery end cap according to a third embodiment of the present application;
fig. 8 is a sectional view showing a use state of a battery end cap according to a fourth embodiment of the present application;
fig. 9 is a sectional view showing a use state of a battery end cap according to a fifth embodiment of the present application;
fig. 10 is a sectional view showing a use state of a battery end cap according to a sixth embodiment of the present application;
fig. 11 is a sectional view showing a use state of a battery end cap according to a seventh embodiment of the present application;
Fig. 12 is a front view of a battery end cap according to an eighth embodiment of the present invention without a second post;
fig. 13 is a front view of a battery end cap according to an eighth embodiment of the present invention, wherein a first tab or a second tab is connected to a first pole body;
fig. 14 is a front view of a battery end cap provided in an eighth embodiment of the present invention;
fig. 15 is a sectional view showing a use state of a battery end cap according to a ninth embodiment of the present invention;
fig. 16 is a sectional view showing a use state of a battery end cap according to a tenth embodiment of the present invention;
fig. 17 is a front view of a bare cell according to an eleventh embodiment of the present invention;
fig. 18 is a front view of a bare cell according to a twelfth embodiment of the present invention;
FIG. 19 is a top view of FIG. 18;
fig. 20 is an exploded view of a bare cell and a battery end cap according to a thirteenth embodiment of the present invention;
fig. 21 to 26 are schematic views illustrating a manufacturing process of a battery according to the present invention;
fig. 27 is a flowchart of a battery manufacturing method according to a fourteenth embodiment of the present invention;
fig. 28 is a flowchart of a battery manufacturing method according to a fifteenth embodiment of the present invention;
fig. 29 is a flowchart of a battery manufacturing method according to a sixteenth embodiment of the present invention.
Reference numerals illustrate:
The battery end cap 100, the end cap body 1, the first through hole 11, the inner wall 111, the protrusion 12, the first electrode post 21, the first conductive base 211, the first conductive post 212, the second electrode cavity 213, the second through hole 214, the gap 215, the insulator 216, the tapered surface structure 217, the conductive sheet 218, the second electrode post 22, the outer circumferential surfaces 2111, 2211, the welding spot 23, the second conductive base 221, the second conductive post 222, the first seal member 3, the first seal sheet 31, the first seal cartridge 32, the second seal member 4, the second seal cartridge 41, the second seal sheet 42, the seal member 5, the first electrode tab 6, the second electrode tab 7, the battery cell 8, and the case 9.
Detailed Description
The application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be noted that, for convenience of description, only the portions related to the application are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
In a first aspect, and referring at least to fig. 1-5, the present invention provides a battery end cap 100 comprising:
an end cap body 1, the end cap body 1 being provided with a first through hole 11 penetrating the end cap body 1 in a first direction; the first through hole 11 may be a single-diameter through hole, a stepped through hole or a part with a tapered hole, and the stepped through hole will be mainly exemplified in the following examples.
The end cap body 1 may be substantially plate-shaped, and may be made of steel, aluminum, an alloy thereof, or other nonmetallic materials.
In some examples, the end cap body 1 may be provided with an explosion-proof valve 13, a liquid injection hole 14, and the like, and electrolyte may be injected into the battery through the liquid injection hole 14. In the formation process after the electrolyte is injected, the injection hole 14 may be used as an exhaust hole for exhausting the gas generated by the formation from the housing 9, and the injection hole 14 may be plugged after the formation is completed, for example, but not limited to, a sealing nail may be welded in the injection hole 14.
The battery end caps 100 provided at both ends of the battery may have the same structure or may be different from each other. For example, but not limited to, the explosion-proof valve 13 and the liquid filling hole 14 may be provided on the positive-side end cap body 1, as shown in fig. 6 to 8, and the liquid filling hole 14 may be provided on the negative-side end cap body 1 without providing the explosion-proof valve 13.
The first through hole 11 may be a two-step through hole, and a small diameter section of the first through hole 11 is used for facing the battery case 9, and a large diameter section is far away from the battery case 9, that is, each diameter section of the first through hole 11 increases from the case 9 outwards in sequence; the diameter here is not limited to the diameter, but may be extended to one of the side lengths in the cross section of the first through hole 11 perpendicular to the axis thereof, and the like. Of course, in other examples, other numbers of steps of vias may be employed.
The battery comprises at least one pole column 2, wherein the pole column 2 is connected in the first through hole 11, a pole lug connection cavity is arranged in the battery end cover 100, the pole lug connection cavity comprises a first pole lug containing cavity extending along a first direction and a second pole lug containing cavity 213 extending along a second direction and communicated with the first pole lug containing cavity, and the first pole lug containing cavity and the second pole lug containing cavity 213 are configured to contain a battery pole lug so as to be electrically connected with the pole column, wherein the first direction and the second direction are intersected.
The first direction and the second direction intersect, so that the battery tab is correspondingly bent and connected in the first tab cavity and the second tab cavity 213.
Preferably, the first tab accommodating cavity and the second tab accommodating cavity 213 are perpendicular to each other, but not limited thereto, the first tab accommodating cavity and the second tab accommodating cavity 213 may also be disposed at an acute angle or an obtuse angle, and the advantage of the bending arrangement is to increase the connection length between the tab and the pole and increase the connection strength.
As one implementation manner, the pole 2 includes a first pole body 21 and a second pole body 22, where the first pole body 21 is fixedly disposed at an inner end of the first through hole 11, and the second pole body 22 is fixedly disposed at an outer end of the first through hole 11; the second ear cavity 213 is located between the first pole body 21 and the second pole body 22, and the second pole body 22 is in sealing fit with the end cover main body 1, so that electrolyte in the battery can be prevented from leaking between the second pole body 22 and the end cover main body 1.
The inner and outer ends of the first through-hole 11 referred to herein are understood to be inner ends of the first through-hole 11 toward the inside of the case 9 and outer ends of the first through-hole 11 toward the outside of the case 9 after the battery end cap 100 is coupled to the case 9.
The second pole body 22 is a conductive member, and is configured to be electrically connected to the battery cell tab at the second pole ear cavity 213; the first pole body 21 is an insulating member, a conductive member, or a conductive member embedded in the top.
As shown in fig. 1, the first pole body 21 and the second pole body 22 are conductive members; as shown in fig. 7, the first pole body 21 is an insulating member, the second pole body 22 is a conductive member, and a groove for forming the second pole ear cavity 213 is disposed on the second pole body 22; as shown in fig. 8, the first pole body 21 is an insulating member, the second pole body 22 is a conductive member, and a groove for forming the second lug accommodating cavity 213 is provided on the first pole body 21; as shown in fig. 9, the first pole body 21 and the second pole body 22 are conductive members, and the first through hole 11 is provided with a first sealing sleeve 32 at least corresponding to the positions of the first pole body 21 and the second pole body 22; as shown in fig. 10, the first pole body 21 includes an insulating member, the second pole body 22 is a conductive member, and a groove for forming the second ear cavity 213 is disposed on the first pole body 21, the conductive member is embedded in the groove, and the conductive member embedded in the groove may be a conductive sheet 218; as shown in fig. 11, the first pole body 21 includes an insulating member, the second pole body 22 is a conductive member, and a groove for forming the second ear cavity 213 is formed on the second pole body 22, the conductive member is embedded in the top surface of the first pole body 21, and the conductive member embedded in the top surface may be a conductive sheet 218.
The material of the insulator is, for example, but not limited to, ceramic, high temperature resistant rubber, etc.
Of course, as other possible implementation manners, the first pole body 21 as the insulating member may be a conductive member.
As an implementation manner, a first tab cavity is formed between the first pole body 21 and the end cap body 1, or formed in the first pole body 21.
Wherein, referring at least to fig. 1, in this example, a first tab cavity is formed in the first pole body 21. Specifically, the first pole body 21 is provided with a second through hole 214, and the second through hole 214 is used as the first tab cavity.
Therein, at least referring additionally to fig. 6, in this example, a first tab cavity is formed between the first pole body 21 and the end cap body 1. Specifically, the end cover main body 1 is provided with a hole, a part of the first pole body 21 is inserted into the hole, a gap 215 is arranged between the outer side surface of the first pole body 21 and the inner wall of the hole, and the gap 215 is used as a first pole lug accommodating cavity.
In some examples, an insulator 216 is disposed on at least a portion of the walls of the hole.
As an implementation manner, in order to position the first pole body 21, a protruding limiting portion is disposed in the first through hole 11, so that the first pole body 21 abuts against the limiting portion to limit in the direction from outside to inside of the first through hole 11.
As an implementation manner, at least as shown in fig. 1, the first through hole 11 includes a stepped through hole, the limit portion is a step portion of the stepped through hole, and at least part of the first pole body 21 is disposed at a step of the first through hole 11; the second pole body 22 is disposed on a side of the first pole body 21 facing away from the small diameter section of the first through hole 11.
The small-diameter section and the large-diameter section are not particularly limited to the sizes of the corresponding hole sections, and only the hole sections with different sizes are distinguished.
The large-diameter section of the first through hole 11 may be a straight hole or a tapered hole as shown in fig. 15, and the inner surface 111 of the large-diameter section of the first through hole 11, the outer circumferential surface 2111 of the first pole body 21, and the outer circumferential surface 2211 of the second pole body 22 are inclined surfaces, respectively.
As another implementation, at least referring to fig. 7, the first through hole 11 includes a tapered hole, the limiting portion is a tapered surface structure 217 that tapers from the first through hole 11 in an outward to inward direction, and at least a portion of the first pole body 21 is limited at the tapered surface structure 217 of the first through hole 11. The tapered surface structure 217 is an inner wall surface of a tapered hole.
According to the battery adopting the battery end cover 100 scheme, after the corresponding tab of the bare cell 8 passes through the second through hole 214 of the first pole column 21, the corresponding tab is bent and welded on the first pole column 21 (the first pole column 21 is a metal piece or the top of the first pole column is embedded with the metal piece), and then the end cover main body 1 is welded on the shell 9; in other words, under the condition that the volumes of the batteries are the same, the volume of the bare cell of the scheme is larger than that of the prior art, and the space utilization rate in the battery is improved; the volume energy density of the battery is improved by the scheme.
With the battery adopting the battery end cover 100 scheme, the corresponding tab of the bare cell 8 can be bent and welded on the first pole body 21 after passing through the second through hole 214 of the first pole body 21. The first pole body 21 can be fixed on the battery end cover 100 in advance, the non-second through hole 214 of the first pole body 21 is of a sealing design, and the welding part of the first pole body 21 and the pole lug is flush with the plane of the cover plate, so that welding slag is not easy to occur in the welding process, or even if the welding slag occurs, the welding slag is not easy to enter the battery, and the yield and the safety of the battery are improved.
The second pole body 22 embeds the welded tab in the battery end cover 100, and the battery end cover 100 does not show the wrinkled tab welding marks after being welded, and the appearance of the battery end cover 100 is neat and beautiful. In this scheme, two polar posts of the polar post of battery end cover 100 are sealed design, and sealed effectual prevents that the inside electrolyte of battery from leaking.
The welding referred to herein may be performed by laser welding, ultrasonic welding, resistance welding, electromagnetic welding, friction welding, resistance welding, or the like. The welding positions should have no defects such as false welding, missing welding, welding explosion, tearing and the like.
The battery has a positive electrode and a negative electrode, and in general, a post serving as the positive electrode is insulated from the case, and a post serving as the negative electrode is electrically connected to the case. Correspondingly, the first pole body 21 and the second pole body 22 serving as the poles of the positive electrode are respectively in insulating fit with the end cap body 1 to prevent a short circuit between the positive and negative electrodes.
As an achievable way, the second lug cavity 213 may be located between the first pole body 21 and the second pole body 22, or between the second pole body 22 and the end cap body 1, or between the first pole body 21 and the end cap body 1. The first tab cavity is configured to allow the battery cell tab to pass therethrough, and bend the battery cell tab to the second tab cavity 213.
Further, the second ear cavity 213 may have a variety of structures, such as:
(1) As shown in fig. 1 and 8, a groove is formed on a side of the first pole body 21 facing the second pole body 22, and the groove and an end surface of the second pole body 22 facing the groove form the second ear cavity 213. At this time, the upper end face of the first pole body 21 is stepped, and the lower end face of the second pole body 22 is a plane; the battery cell tab is embedded in one side of the first pole body 21, which is concave, and after the battery cell tab is bent, the end face of the battery cell tab is flush with the surface of the first pole body 21.
(2) As shown in fig. 6, 7 and 9-11, a groove is formed on a side of the second pole body 22 facing the first pole body 21, and a second lug accommodating cavity 213 is formed on the groove and an end surface of the first pole body 21 facing the groove. At this time, the lower end face of the second pole body 22 is stepped, and the upper end face of the first pole body 21 is a plane; the battery cell tab is embedded in the concave side of the second pole body 22, and after the battery cell tab is bent, the end face of the battery cell tab is flush with the surface of the second pole body 22.
(3) A groove is formed on one side of the first pole body 21 facing the second pole body 22, another groove is formed on one side of the second pole body 22 facing the first pole body 21, and the two grooves (not shown in the figure) jointly form the second lug accommodating cavity 213; at this time, the lower end face of the second pole body 22 is in a step shape, the upper end face of the first pole body 21 is in a step shape, and the two grooves are commonly accommodated after the battery cell tab is bent.
(4) The second tab cavity 213 may be located between the second pole body 22 and the sealing structure of the end cap body 1, and at this time, there is no need to provide the first pole body 21 or to avoid the design at the position of the first pole body 21 corresponding to the battery tab, and there is no space structure. At this time, the battery tab is directly pressed by the second pole body 22 against the sealing structure (insulating member) of the end cap body 1. Further, the first pole body 21 has a notch (not shown in the figure) on one side of the first pole ear cavity, the notch enables the battery tab to be located between the second pole body 22 and the sealing structure of the end cover body 1, and the notch, the end face of the second pole body 22 facing the end cover body 1, and the end face of the end cover body 1 facing the second pole body 22 serve as the second pole ear cavity 213.
(5) The side of the first pole body 21 facing the end cap body 1 is provided with a groove (not shown in the figure), and the groove and the end surface of the end cap body 1 facing the first pole body 21 form the second lug accommodating cavity 213. In this implementation manner, the first pole body 21 should be provided as a conductive member, and a sealing structure or an insulating structure should be provided at the end surface of the end cover main body 1 facing the first pole body 21, so as to avoid that the end cover main body is directly electrically connected with the electrode lug with no resistance or small resistance.
As an implementation manner, the battery end cover 100 further includes a sealing and pressing member 5, a third through hole is provided on the sealing and pressing member 5, a portion of the second pole body 22 is installed in the third through hole in a penetrating manner, the second pole body 22 is in sealing fit with the sealing and pressing member 5, and the sealing and pressing member 5 is fixedly connected to a large-diameter section of the first through hole 11 and is in press fit with the second pole body 22 in a direction towards the first pole body 21.
The packing member 5 may be welded to the end cap body 1 for fixing the first pole body 21 and the second pole body 22 into the first through hole 11.
The packing member 5 brings the opposite ends of the first pole body 21 and the second pole body 22 into contact by applying pressure to the second pole body 22 in the direction toward the first pole body 21, so as to achieve electrical connection of the first pole body 21 and the second pole body 22. Wherein the opposite ends of the first pole body 21 and the second pole body 22 may be in planar contact or non-planar contact; referring also to fig. 16, the non-planar contact may be, for example, a groove provided in one of the opposite ends of the first pole body 21 and the second pole body 22, in which the end of the other is located, and the groove wall may be a straight surface, an inclined surface, an arc surface, or the like, which is employed in this example.
As an implementation, a first seal 3 is provided between the end cap body 1 and the first pole body 21 and the second pole body 22.
The end cap body 1 is insulated from the first pole body 21 by providing the first seal 3, and the end cap body 1 is insulated from the second pole body 22.
As an implementation manner, the first sealing member 3 includes a first sealing piece 31, a first sealing sleeve 32 is connected to the first sealing piece 31, the first sealing piece 31 covers an end surface of the end cover main body 1 facing away from the second pole body 22, and the first sealing sleeve 32 covers at least a partial area of the inner wall of the first through hole 11 in a conformal manner.
Preferably, the first sealing piece 31 may completely cover the entire end surface of the end cap body 1 facing away from the second pole body 22, so as to protect the end surface from insulation. The first sealing piece 31 may be provided only at the position of the opening of the first through hole 11, and an insulating holder may be provided between the battery inner end cover and the bare cell.
As an implementation manner, the large-diameter section of the first through hole 11 is exposed to the first sealing sleeve 32 at a position close to the orifice. That is, the large diameter section of the first through hole 11 is not covered with the first insulator at a position close to the orifice, so that the packing member 5 is connected at the position not covered with the first insulator and the welding with the cap body 1 is performed.
As an implementation manner, the large-diameter section of the first through hole 11 is provided with an inward protrusion 12 at a position close to the orifice, and the inner side surface of the protrusion 12 is flush with the inner side surface of the large-diameter section of the first sealing sleeve 32.
By providing the protrusion 12, the end of the first sealing sleeve 32 can be protected and positioned, and the sealing element 5 is welded at the position of the protrusion 12; in addition, the inner side surface of the protrusion 12 is flush with the inner side surface of the large diameter section of the first sealing sleeve 32, and does not protrude from the inner side surface of the large diameter section of the first sealing sleeve 32, so that the first pole body 21 and the second pole body 22 can be smoothly inserted into the first through hole 11 for assembly.
As an implementation manner, the first pole body 21 includes a first conductive base body 211, a first conductive post 212 is connected to the first conductive base body 211, and the first tab cavity (the second through hole 214) penetrates through the first conductive base body 211 and the first conductive post 212; the first conductive post 212 is inserted into the small diameter section of the first sealing sleeve 32.
As an implementation manner, the first tab cavity and the second tab cavity are provided with the first sealing member 3 in an insulating manner at positions corresponding to the first tab cavity and the second tab cavity of the end cover main body 1 when the first tab cavity and the second tab cavity are adjacent to the end cover main body 1.
The condition that the first tab cavity is adjacent to the end cover main body 1 means that the width dimension of the first pole body 21 is smaller than the width dimension of the end cover main body at the small diameter section of the first through hole, and a gap 215 exists between the first pole body and the end cover main body, so that an insulating or certain-resistance sealing member is required to be arranged to avoid direct electrical connection between the tab and the end cover main body. Similarly, the condition that the second tab cavity is adjacent to the end cover main body 1 refers to that the tab is directly pressed on the limiting portion (step surface or inclined surface) of the end cover main body by the first pole body 21 or the second pole body 22, and in order to avoid the direct electrical connection between the tab and the end cover main body, an insulating or certain resistance sealing member is required.
As an implementation manner, a second sealing member 4 is arranged between the sealing member 5 and the second pole body 22, and the second sealing member 4 is closely attached to the first sealing member 3, so that the pole body 2 is sealed in the first through hole 11. The cooperation of the second sealing member 4 and the first sealing member 3 can prevent the second pole body 22 from being electrically connected with the sealing member 5, and then the positive and negative poles are short-circuited through the shell 9 welded with the sealing member 5.
As an implementation manner, the second pole body 22 includes a second conductive substrate 221, and the second conductive substrate 221 is connected to a second conductive pole 222; the second sealing element 4 comprises a second sealing piece 42, and a second sealing sleeve 41 is connected to the second sealing piece 42; the second conductive post 222 is penetrating through the second sealing sleeve 41, and the second sealing piece 42 covers the second conductive substrate 221; the second sealing sleeve 41 is inserted through the third through hole, and the sealing member 5 is press-fitted with the second sealing piece 42.
In the scheme of the application, the first sealing element 3 and the second sealing element 4 can play a role in sealing and insulating.
As an implementation manner, one end of the second conductive post 222 protrudes out of the second sealing sleeve 41, so that the second conductive post 222 is convenient to be electrically connected with external charging equipment and electric equipment.
As an implementation, the inner end surface of the second seal member 4 is flush with or staggered with the outer end surface of the first seal member 3. Alternatively, the outer end face of the first seal 3 is higher than the inner end face of the second seal 4, both forming a tight fit.
In a second aspect, referring to at least fig. 17 and fig. 21-26, the present application provides a battery, including a housing 9, where at least one battery end cap 100 is connected to the housing 9;
a bare cell 8, the bare cell 8 being encapsulated within the housing 9, the bare cell 8 comprising at least one first tab 6 and at least one second tab 7;
the first tab 6 and the second tab 7 are foil tabs integrally connected with corresponding pole pieces of the bare cell 8 respectively.
Among the first tab 6 and the second tab 7, one is a positive tab and the other is a negative tab according to the connection relationship.
In general, the positive electrode tab uses an aluminum sheet, and the negative electrode tab uses a nickel sheet or a copper sheet having a nickel plating layer, or the like.
At least one of the first tab 6 and the second tab 7 is inserted into the first tab accommodating cavity (the second through hole 214), and the end portion of the first tab accommodating cavity is exposed, and is fixedly connected to the second tab accommodating cavity 213, and the tab is electrically connected to the corresponding pole 2. The fixed connection described herein may be crimping, welding, or the like.
According to the scheme, after the corresponding tab of the bare cell 8 passes through the second through hole 214 of the first pole body 21, the end part of the corresponding tab is exposed out of the second through hole 214, the corresponding tab is bent and welded on the first pole body 21, and then the end cover main body 1 is welded on the shell 9.
For the case 9 with two opposite ends open, one end of the case may adopt a battery end cap 100 in the prior art, and the other end adopts the battery end cap 100 in the scheme of the present application, under this structure, it is generally necessary to connect the battery end cap 100 in the prior art with the bare cell 8 first, then insert the bare cell 8 into the case 9, and then connect the battery end cap 100 in the scheme of the present application with the bare cell 8; the battery end cap 100 of the present embodiment may also be employed at both ends. It is also possible that the housing 9 has only one opening and that one battery end cap 100 has two poles 2, i.e. the positive and negative poles are located on the same side of the battery.
As an implementation manner, referring to fig. 20, for the positive and negative poles of the battery to be located at the same end of the battery, the battery includes one battery end cap 100, and the battery end cap 100 is provided with two poles 2, wherein one pole 2 is used as the positive pole 2, and the other pole 2 is used as the negative pole 2;
the first tab 6 and the second tab 7 are positioned at the same end of the bare cell 8;
the first tabs 6 and the second tabs 7 are correspondingly threaded through the corresponding first tab cavities (second through holes 214), the end portions of the first tabs are exposed out of the corresponding first tab cavities and are fixedly connected in the corresponding second tab cavities 213, and the tabs are electrically connected with the corresponding pole posts 2. The fixed connection described herein may be crimping, welding, or the like.
One of the first tab 6 and the second tab 7, which is the negative tab, passes through the second through hole 214 of the first tab body 21 of the negative electrode post 2, is exposed out of the end of the second through hole 214, is bent on the end face of the first tab body 21, is welded and fixed with the first tab body 21, and the welded and fixed part is positioned in the corresponding second tab accommodating cavity 213; the one of the positive tabs passes through the second through hole 214 of the first pole body 21 of the positive pole 2 and is exposed at the end of the second through hole 214, is bent on the end face of the first pole body 21, and is welded and fixed with the first pole body 21, and the welded and fixed part is positioned in the corresponding second pole tab accommodating cavity 213. The first tab 6 and the second tab 7 are welded to the corresponding first pole body 21 by using strip-shaped welding points 23.
As an implementation manner, for the positive and negative poles of the battery located at two opposite ends of the battery, two opposite ends of the housing 9 are respectively provided with one battery end cover 100, each battery end cover 100 is provided with one pole 2, one pole 2 is used as a positive pole, and the other pole 2 is used as a negative pole;
the first electrode lug 6 and the second electrode lug 7 are positioned at two opposite ends of the bare cell 8;
The first tabs 6 and the second tabs 7 are correspondingly threaded through the corresponding first tab cavities (second through holes 214), the end portions of the first tabs are exposed out of the corresponding first tab cavities and are fixedly connected in the corresponding second tab cavities 213, and the tabs are electrically connected with the corresponding pole posts 2. The fixed connection described herein may be crimping, welding, or the like.
One of the first tab 6 and the second tab 7, which is the negative tab, passes through the second through hole 214 of the first tab body 21 of the negative electrode post 2 of one of the battery end covers 100, is exposed out of the end part of the second through hole 214, is bent on the end surface of the first tab body 21, is welded and fixed with the first tab body 21, and the welded and fixed part is positioned in the corresponding second tab accommodating cavity 213; one of the positive tabs passes through the second through hole 214 of the first electrode post 21 of the positive electrode post 2 of the other battery end cap 100 and is exposed at the end of the second through hole 214, is bent over the end surface of the first electrode post 21 and is welded to the first electrode post 21, and the welded part is located in the corresponding second electrode tab accommodating cavity 213.
As an implementation manner, see fig. 18 and 19, the integrated circuit device further includes a plurality of first tabs 6 and a plurality of second tabs 7, the plurality of first tabs 6 and the plurality of second tabs 7 are respectively connected into integrated structures 61 and 71, each integrated structure 61 and 71 is correspondingly threaded through a corresponding first tab cavity (second through hole 214), and an end portion of each integrated structure 61 and 71 is exposed out of each corresponding first tab cavity and is fixedly connected in each corresponding second tab cavity 213. The fixed connection described herein may be crimping, welding, or the like.
For example, but not limited to, the plurality of first tabs 6 and the plurality of second tabs 7 are connected as a unitary structure 61, 71, respectively, by means of welding.
The first tabs 6 and the second tabs 7 are connected as integral structures 61, 71, respectively, for easy insertion into the corresponding second through holes 214.
In a third aspect, the present invention provides an electric device, including the battery described above.
Electrical consumers such as, but not limited to, new energy vehicles (electric vehicles, hybrid vehicles, etc.), digital products, electric aircraft, electric watercraft, etc.
In a fourth aspect, a method for preparing a battery is provided, comprising the steps of:
preparing an end cover main body 1 and a bare cell: the end cover main body 1 is provided with a first through hole 11 penetrating the end cover main body 1 along a first direction, the end cover main body 1 is provided with at least one pole column 2, the pole column 2 is connected in the first through hole 11, the battery end cover 100 is internally provided with a pole lug connection cavity, and the pole lug connection cavity comprises a first pole lug containing cavity extending along the first direction and a second pole lug containing cavity 213 extending along a second direction and communicated with the first pole lug containing cavity, wherein the first direction and the second direction are intersected;
The bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
According to the scheme, after the corresponding battery cell lug of the bare battery cell penetrates through the first lug accommodating cavity, the corresponding battery cell lug of the bare battery cell can be bent and connected to the second lug accommodating cavity, and then the end cover main body is welded on the shell.
In a fifth aspect, a method for preparing a battery using the battery end cap is provided, including the steps of:
preparing an end cover main body 1 and a bare cell;
the bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
According to the scheme, after the corresponding battery cell lug of the bare battery cell penetrates through the first lug accommodating cavity, the corresponding battery cell lug of the bare battery cell can be bent and connected to the second lug accommodating cavity, and then the end cover main body is welded on the shell.
As an implementation manner, in the case that the second tab cavity is located between the first pole body 21 and the second pole body 22, the connection of the bare cell and the cover plate includes:
connecting the first pole body 21 to a small diameter section of a stepped hole or a tapered hole of the first through hole 11 of the end cover main body 1;
extending a tab of a bare cell from the first tab accommodating cavity formed in the first pole body 21 or between the first pole body 21 and the end cover main body 1 to one side of the first pole body 21 facing away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
the second pole body 22 is disposed on the large diameter section of the stepped hole or the tapered hole of the first through hole 11, so that the bent tab is pressed by the first pole body 21 and the second pole body 22, so as to realize the electrical connection between the second pole body 22 and the first tab 6.
The connection of the first pole body 21 to the end cap body 1 may be performed prior to the preparation of the battery or may be performed during the preparation of the battery.
As an implementation manner, after the step of bending the tab to a side facing the second tab cavity, the bent tab is fixedly connected and/or electrically connected to the first pole body 21. The fixed connection described herein may be compression, threaded connection, riveting, welding, etc. The electrical connection described herein may be a solder or the like.
As an implementation manner, in the case that the second tab cavity is located between the first pole body 21 and the end cap body 1, the connection of the bare cell and the cover plate includes:
extending a tab of a bare cell from the first tab accommodating cavity between the first pole body 21 and the end cover main body 1 to one side of the end cover main body 1, which is far away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
connecting the first pole body 21 to a small-diameter section of a stepped hole or a conical hole of the first through hole 11 of the end cover main body 1, so that part of the structure of the first pole body 21 is pressed and connected to the bent pole lug;
the second pole body 22 is disposed at a large diameter section of the stepped hole or the tapered hole of the first through hole 11, so as to realize the electrical connection between the second pole body 22 and the first pole body 21, and the first tab 6.
It will be appreciated that after the step of bending the tab to the side facing the second tab cavity, the bent tab is fixedly and/or electrically connected to the first pole body 21. In this case, the first pole body 21 needs to be a conductive member, the tab needs to be electrically connected to the first pole body 21, and the end face of the small diameter section of the stepped hole or the tapered hole of the first through hole 11 of the end cover main body 1 needs to be provided with an insulating or a sealing structure with a certain resistance value.
As an implementation, in the case where the second tab cavity is located between the second pole body 22 and the end cap body 1, the first pole body 21 needs to be designed to have a notch on the tab side, so that the second pole body 22 directly presses the tab against the end face position of the stepped hole or the small-diameter section of the tapered hole of the first through hole 11 of the end cap body 1.
As an implementation manner, when the tab is arranged at two sides of the battery: the two opposite sides of the bare cell 8 are respectively provided with the first electrode lug 6 and the second electrode lug 7, and the two opposite sides of the shell 9 of the battery are respectively provided with an opening. One tab of the first tab 6 and the second tab 7 of the bare cell is connected with the cover plate outside the shell 9, and the other tab is connected with the cover plate inside the shell 9; alternatively, the first tab 6 and the second tab 7 of the bare cell are both connected to the cover plate in the housing 9.
As an implementation manner, when the battery is provided with the tab at the same side: the battery end cap 100 is provided with two of the poles 2; a first tab 6 and a second tab 7 are arranged on the same side of the bare cell 8;
the first electrode lug 6 and the second electrode lug 7 of the bare cell are connected with the cover plate outside the shell 9; alternatively, the first tab 6 and the second tab 7 of the bare cell are both connected to the cover plate in the housing 9.
As an implementation manner, the sealing and pressing members 5 are respectively and hermetically inserted into the two second pole bodies 22, and each sealing and pressing member 5 is fixedly connected with the corresponding end cover main body 1, and each end cover main body 1 is respectively and fixedly connected with the housing 9.
Further, the packing members 5 are respectively sealed and penetrated on the two second pole bodies 22, and each packing member 5 is fixedly connected with the end cap body 1, and the end cap body 1 is fixedly connected with the housing 9.
In a sixth aspect, referring to fig. 27, the present invention provides a method for preparing a battery using the battery end cap 100, comprising the steps of:
s10: referring also to fig. 23, the bare cell 8 is inserted into the housing 9;
the bare cell 8 may be a wound cell or a laminated cell. The pole piece of the bare cell 8 is integrally connected with a foil tab, and the foil tab is divided into a first tab 6 and a second tab 7 according to the difference of the anode and the cathode.
For example, but not limited to, the housing 9 may be formed by cutting a square tube to a predetermined length, and the opposite ends thereof may be respectively provided with a first opening and a second opening, and the material thereof may be aluminum alloy, steel, or the like. The housing 9 is used for protecting the bare cell 8 arranged therein, and in addition, the machining precision of the housing 9 can reach higher precision, so that the consistency of the external dimensions of the battery can be improved.
S20: referring to fig. 24, the end cap body 1 connected with the first pole body 21 is covered on the first opening of the housing 9, and after the first tab 6 of the bare cell 8 passes through the second through hole 214, the first tab is bent and welded on the first pole body 21;
after the bare cell 8 is inserted into the shell 9, the end cover main body 1 connected with the first pole column 21 and not connected with the second pole column 22 is covered on the first opening of the shell 9, in the covering process, the first pole ear 6 of the bare cell 8 passes through the second through hole 214 of the first pole column 21, after the end cover main body 1 is installed in place, the first pole ear 6 extends out of the second through hole 214, the extending part is bent by 90 degrees to be attached to the end face of the first pole column 21, and then the bent part and the first pole column 21 are welded together in a welding mode.
S30: referring to fig. 25, the second pole body 22 is disposed at the large diameter section of the stepped hole, and opposite ends of the first pole body 21 and the second pole body 22 are in contact for electrical connection, and the portion of the first tab 6 welded on the first pole body 21 is located in the second tab accommodating cavity 213.
After the first tab 6 is welded, the second tab 22 is mounted in the stepped hole from the large diameter section of the stepped hole, and the opposite end surfaces of the first tab 21 and the second tab 22 are contacted with each other to realize the electrical connection of the first tab 21 and the second tab 22, and after the second tab 22 is mounted in place, the part of the first tab 6 welded on the first tab 21 is bent and positioned in the second tab accommodating cavity 213 formed on the opposite side of the first tab 21 and the second tab 22.
As an realizable mode, the first tab 6 and the second tab 7 are respectively arranged on two opposite sides of the bare cell 8, and the first opening and the second opening are respectively arranged on two opposite sides of the shell 9;
before or after the step S10, the method further includes:
s101: referring to fig. 23, the second tab 7 is inserted through the second through hole 214 of the first pole body 21 connected to the other cover body 1, and then bent and welded to the first pole body 21.
That is, the second tab 7 is first connected to one of the battery end caps 100 before the first tab 6 is connected to the other battery end cap 100. The step of connecting the second tab 7 to the other battery end cap 100 may be performed before the bare cell 8 is inserted into the case 9 or after the bare cell 8 is inserted into the case 9.
As an implementation manner, after the step S101, the method further includes:
s102: referring to fig. 22, another second pole body 22 is disposed at the large diameter section corresponding to the stepped hole, and the second pole body 22 contacts the opposite end of the corresponding first pole body 21 to be electrically connected, and the portion of the second pole 7 welded to the first pole body 21 is located in the corresponding second pole ear accommodating cavity 213.
The same principle as the connection of the first tab 6, the second tab 7 is connected to its corresponding first pole body 21, and then the second pole body 22 is connected to its corresponding stepped hole.
In the above steps, one of the battery end caps 100 is connected to the first opening and the second opening of the opposite ends of the case 9.
As an implementation manner, the sealing members 5 are respectively sealed and penetrated on the two second pole bodies 22, each sealing member 5 is welded and fixed with the corresponding end cover main body 1, and each end cover main body 1 is welded and fixed with the shell 9.
For example, ring welding is performed around the first opening, and the end cap body 1 of the battery end cap 100 is welded and fixed together with the first opening so that the end cap body 1 seals the first opening. The end cap body 1 of the other battery end cap 100 is welded and fixed together around the second opening so that the end cap body 1 seals the second opening. In addition, ring welding is performed around the orifice of the first through hole 11, and the packing member 5 and the end cap body 1 are welded and fixed together.
In a fifth aspect, referring to fig. 28, in the case that the anode and the cathode are located at the same end of the battery, the present invention provides a method for preparing a battery by using the above-mentioned battery end cap 100, where the battery end cap 100 is provided with two electrode posts 2; a first tab 6 and a second tab 7 are arranged on the same side of the bare cell 8;
the preparation method of the battery comprises the following steps:
s100: inserting the bare cell 8 into the housing 9;
s200: covering the opening of the housing 9 with the end cover main body 1 connected with the first pole body 21, and enabling the first pole ear 6 and the second pole ear 7 of the bare cell 8 to pass through the two second through holes 214 in a one-to-one correspondence manner, and then respectively bending and welding the two through holes on the corresponding first pole body 21;
s300: the two second pole bodies 22 are respectively arranged at the large-diameter sections corresponding to the stepped holes, the opposite ends of the first pole bodies 21 and the corresponding second pole bodies 22 are in contact for electric connection, the parts of the first pole lugs 6, which are welded on the corresponding first pole bodies 21 in a bending manner, and the parts of the second pole lugs 7, which are welded on the corresponding first pole bodies 21 in a bending manner, are respectively positioned in the corresponding second pole lug accommodating cavities 213.
The main difference between this example method and the above method is that the battery has only one battery end cap 100, the end cap main body 1 connected with two first pole bodies 21 and not connected with the second pole bodies 22 is covered on the opening of the housing 9, during the covering process, the first pole ears 6 and 7 of the bare cell 8 respectively pass through the second through holes 214 of the corresponding first pole bodies 21 at the same time, after the end cap main body 1 is installed in place, the first pole ears 6 and 7 respectively extend out of the corresponding second through holes 214, the extending parts of the first pole ears 6 and 7 are respectively bent by 90 degrees to be attached to the end faces of the corresponding first pole bodies 21, and then the bending parts of the first pole ears 6 and 7 and the corresponding first pole bodies 21 are welded together by welding.
As an implementation manner, the sealing members 5 are respectively sealed and penetrated on the two second pole bodies 22, and each sealing member 5 is welded and fixed with the end cover main body 1, and the end cover main body 1 is welded and fixed with the shell 9.
In a sixth aspect, referring to fig. 29, the present invention provides a method for preparing a battery using the above-mentioned battery end cap 100, wherein the battery end cap 100 is provided with two of the posts 2; a first tab 6 and a second tab 7 are arranged on the same side of the bare cell 8;
The preparation method of the battery comprises the following steps:
s1001: after the first electrode lugs 6 and the second electrode lugs 7 of the bare cell 8 correspondingly pass through the two second through holes 214 one by one, respectively bending and welding the first electrode lugs and the second electrode lugs on the corresponding first electrode columns 21;
s1002: after the two second pole bodies 22 are respectively arranged on the large-diameter sections corresponding to the step holes, the bare cell 8 is inserted into the shell 9, or after the bare cell 8 is inserted into the shell 9, the two second pole bodies 22 are respectively arranged on the large-diameter sections corresponding to the step holes; so that the end cover body 1 covers the opening of the housing 9, wherein the opposite ends of each first pole body 21 and the corresponding second pole body 22 are in contact for electrical connection, the part of the first pole lug 6 which is welded on the corresponding first pole body 21 in a bending way, and the part of the second pole lug 7 which is welded on the corresponding first pole body 21 in a bending way are respectively positioned in the corresponding second pole lug accommodating cavity 213.
The main difference between this example method and the above method is that the bare cell 8 is inserted into the case 9 after the first tab 6 and the second tab 7 of the bare cell 8 are welded to the first pole body 21.
As an implementation manner, the sealing members 5 are respectively sealed and penetrated on the two second pole bodies 22, and each sealing member 5 is welded and fixed with the end cover main body 1, and the end cover main body 1 is welded and fixed with the shell 9.
It is to be understood that the above references to the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., are for convenience in describing the present invention and simplifying the description only, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims (35)

1. A battery end cap (100), characterized by: comprising the following steps:
an end cap body (1), the end cap body (1) being provided with a first through hole (11) penetrating the end cap body (1) in a first direction;
at least one utmost point post (2), utmost point post (2) connect in first through-hole (11), be provided with utmost point ear connection chamber in battery end cover (100), utmost point ear connection chamber is including along the first utmost point ear appearance chamber of first direction extension and along the second direction extension and with first utmost point ear appearance chamber intercommunication second utmost point ear appearance chamber (213), wherein first utmost point ear appearance chamber with second utmost point ear appearance chamber (213) are configured to hold electric core utmost point ear in order to with the utmost point post forms the electricity to be connected, wherein first direction with the crossing setting of second direction.
2. The battery end cap (100) according to claim 1, wherein the pole (2) comprises a first pole body (21) and a second pole body (22), the first pole body (21) is disposed at an inner side end of the first through hole (11), the second pole body (22) is disposed at an outer side end of the first through hole (11), and the second pole body (22) is in sealing fit with the end cap body (1).
3. The battery end cap (100) of claim 2, wherein the first tab cavity is formed between the first pole body (21) and the end cap body (1) or within the first pole body (21); and/or the number of the groups of groups,
the second lug accommodating cavity (213) is located between the first pole body (21) and the second pole body (22), or between the second pole body (22) and the end cover main body (1), or between the first pole body (21) and the end cover main body (1).
4. The battery end cap (100) according to claim 3, wherein a protruding stopper is provided in the first through hole (11) such that the first pole body (21) abuts against the stopper for stopper in a direction from outside to inside from the first through hole (11).
5. The battery end cap (100) of claim 4, wherein the first through hole (11) comprises a stepped through hole, the stopper is a stepped portion of the stepped through hole, and at least a portion of the first pole body (21) is disposed at a step of the first through hole (11); the second pole body (22) is arranged at one side of the first pole body (21) away from the small-diameter section of the first through hole (11); or alternatively, the process may be performed,
the first through hole (11) comprises a conical hole, the limiting part is of a conical surface structure which is contracted from the first through hole (11) in the direction from outside to inside, and at least part of the first pole body (21) is limited at the conical surface structure of the first through hole (11).
6. The battery end cover (100) according to claim 3, wherein the first pole body (21) is provided with a second through hole (214), the second through hole (214) is used as the first pole ear cavity, the second pole ear cavity (213) is arranged between the first pole body (21) and the second pole body (22), and the first pole ear cavity is used for allowing the battery pole ear to pass through and bending the battery pole ear to the second pole ear cavity (213).
7. The battery end cap (100) of any of claims 2-6, wherein the second post (22) is a conductive member for electrical connection with the cell tab at the second tab cavity (213); the first pole body (21) is an insulating piece, a conducting piece or a conducting piece embedded in the top.
8. The battery end cap (100) according to claim 2, wherein the first pole body (21) and the second pole body (22) of at least one of the pole bodies (2) are respectively in insulating fit with the end cap body (1).
9. A battery end cap (100) according to claim 3, wherein a side of the first pole body (21) facing the second pole body (22) is provided with a groove, and the groove and an end surface of the second pole body (22) facing the groove form the second pole ear cavity (213); or alternatively, the process may be performed,
a groove is formed in one side, facing the first pole body (21), of the second pole body (22), and the end faces, facing the groove, of the groove and the first pole body (21) serve as second lug cavities (213); or alternatively, the process may be performed,
a groove is formed in one side, facing the second pole body (22), of the first pole body (21), another groove is formed in one side, facing the first pole body (21), of the second pole body (22), and the two grooves jointly form the second lug accommodating cavity (213); or alternatively, the process may be performed,
the first pole body (21) is provided with a notch at one side of the first pole lug accommodating cavity, the notch enables the battery cell pole lug to be positioned between the second pole body (22) and the end cover main body (1), and the notch, the end face of the second pole body (22) facing the end cover main body (1) and the end face of the end cover main body (1) facing the second pole body (22) form a second pole lug accommodating cavity (213); or alternatively, the process may be performed,
The first pole body (21) is provided with a groove towards one side of the end cover main body (1), and the groove and the end surface of the end cover main body (1) facing the first pole body (21) form the second pole lug accommodating cavity (213).
10. The battery end cover (100) according to claim 5, further comprising a sealing and pressing member (5), wherein a third through hole is provided in the sealing and pressing member (5), a portion of the second pole body (22) is installed in the third through hole in a penetrating manner, the second pole body (22) is in sealing fit with the sealing and pressing member (5), and the sealing and pressing member (5) is fixedly connected to a large diameter section of the first through hole (11) and is in press fit with the second pole body (22) in a direction towards the first pole body (21).
11. The battery end cap (100) of claim 10, wherein a first seal (3) is provided between the end cap body (1) and the first and second pole bodies (21, 22).
12. The battery end cap (100) of claim 11, wherein the first and second tab cavities are each provided with an insulating first seal (3) at a location corresponding to the first and second tab cavities of the end cap body (1) when adjacent to the end cap body (1).
13. The battery end cover (100) according to claim 11, wherein the first sealing member (3) comprises a first sealing sheet (31), a first sealing sleeve (32) is connected to the first sealing sheet (31), the first sealing sheet (31) covers the end face of the end cover main body (1) facing away from the second pole body (22), and the first sealing sleeve (32) covers at least part of the area of the inner wall of the first through hole (11) in a conformal manner.
14. The battery end cap (100) of claim 13, wherein the large diameter section of the first through hole (11) is exposed to the first sealing sleeve (32) at a position near the aperture.
15. The battery end cap (100) of claim 14, wherein the large diameter section of the first through hole (11) is provided with an inward protrusion (12) at a position close to the aperture, and an inner side surface of the protrusion (12) is flush with an inner side surface of the large diameter section of the first sealing sleeve (32).
16. The battery end cap (100) of any of claims 13-15, wherein the first pole body (21) comprises a first conductive base (211), a first conductive post (212) is connected to the first conductive base (211), and the first tab cavity extends through the first conductive base (211) and the first conductive post (212); the first conductive column (212) is inserted into the small-diameter section of the first sealing sleeve (32).
17. The battery end cap (100) of claim 11, wherein a second seal (4) is disposed between the crimp (5) and the second post (22), the second seal (4) being in close proximity to the first seal (3) such that the post (2) is sealed within the first through hole (11).
18. The battery end cap (100) of claim 17, wherein the second post (22) comprises a second conductive base (221), the second conductive base (221) having a second conductive post (222) connected thereto; the second sealing piece (4) comprises a second sealing piece (42), and a second sealing sleeve (41) is connected to the second sealing piece (42); the second conductive column (222) penetrates through the second sealing sleeve (41), and the second sealing piece (42) covers the second conductive matrix (221); the second sealing sleeve (41) penetrates through the third through hole, and the sealing pressing piece (5) is in press fit with the second sealing piece (42).
19. The battery end cap (100) of claim 18, wherein one end of the second conductive post (222) protrudes from the second sealing sleeve (41).
20. The battery end cap (100) of claim 17, wherein the inner end face of the second seal (4) is flush with or staggered from the outer end face of the first seal (3).
21. A battery comprising a housing (9), said housing (9) having at least one battery end cap (100) according to any one of claims 1-20 attached thereto;
a bare cell (8), the bare cell (8) being encapsulated within the housing (9), the bare cell (8) comprising at least one first tab (6) and at least one second tab (7);
at least one of the first lug (6) and the second lug (7) penetrates through the first lug accommodating cavity, the end part of the first lug accommodating cavity is exposed out of the first lug accommodating cavity and is fixed in the second lug accommodating cavity (213), and the lug is electrically connected with the corresponding pole (2).
22. The battery according to claim 21, comprising one of the battery end caps (100), the battery end cap (100) being provided with two of the posts (2);
the first electrode lug (6) and the second electrode lug (7) are positioned at the same end of the bare cell (8);
the first lugs (6) and the second lugs (7) are correspondingly penetrated in the corresponding first lug accommodating cavities one by one, the end parts of the first lugs are exposed out of the corresponding first lug accommodating cavities and are fixed in the corresponding second lug accommodating cavities (213), and the lugs are electrically connected with the corresponding pole posts (2).
23. The battery according to claim 21, wherein one of said battery end caps (100) is provided at each of opposite ends of said housing (9), each of said battery end caps (100) being provided with one of said poles (2);
the first electrode lug (6) and the second electrode lug (7) are positioned at two opposite ends of the bare cell (8);
the first lugs (6) and the second lugs (7) are correspondingly penetrated in the corresponding first lug accommodating cavities one by one, the end parts of the first lugs are exposed out of the corresponding first lug accommodating cavities and are fixed in the corresponding second lug accommodating cavities (213), and the lugs are electrically connected with the corresponding pole posts (2).
24. The battery according to claim 22 or 23, comprising a plurality of first tabs (6) and a plurality of second tabs (7), wherein the plurality of first tabs (6) and the plurality of second tabs (7) are respectively connected into integral structures (61, 71), each integral structure (61, 71) is correspondingly penetrated in the corresponding first tab cavity one by one, and the end parts of the integral structures are exposed out of the corresponding first tab cavity and are fixed in the corresponding second tab cavity (213), and each tab is electrically connected with the corresponding pole (2).
25. The battery according to any one of claims 21-23, wherein the first tab (6) and the second tab (7) are foil tabs integrally connected with corresponding pole pieces of the bare cell (8), respectively.
26. A powered device comprising a battery as claimed in any one of claims 21-25.
27. A method of making a battery comprising the steps of:
preparing an end cover main body (1) and a bare cell: the battery end cover comprises an end cover main body (1), wherein the end cover main body (1) is provided with a first through hole (11) penetrating through the end cover main body (1) along a first direction, the end cover main body (1) is provided with at least one pole column (2), the pole column (2) is connected in the first through hole (11), a pole lug connecting cavity is arranged in the battery end cover (100), and comprises a first pole lug containing cavity extending along the first direction and a second pole lug containing cavity (213) extending along a second direction and communicated with the first pole lug containing cavity, wherein the first direction and the second direction are intersected;
the bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
28. A method of manufacturing a battery employing the battery end cap (100) of any of claims 1-20, comprising the steps of:
preparing an end cover main body (1) and a bare cell;
the bare cell is connected with the cover plate: and extending the electrode lug of the bare cell into the first electrode lug accommodating cavity, bending the electrode lug into the second electrode lug accommodating cavity, and electrically connecting the electrode lug of the bare cell with the electrode post.
29. The method of claim 28, wherein the connecting the bare cell to the cover plate comprises:
connecting the first pole body (21) to a small diameter section of a stepped hole or a tapered hole of a first through hole (11) of the end cover main body (1);
extending a tab of a bare cell from the first tab cavity formed in the first pole body (21) or between the first pole body (21) and the end cover main body (1) to one side of the first pole body (21) facing away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
the second pole body (22) is arranged on the large-diameter section of the stepped hole or the conical hole of the first through hole (11), so that the bent pole lug is pressed by the first pole body (21) and the second pole body (22), and the second pole body (22) is electrically connected with the first pole lug (6).
30. The battery preparation method according to claim 29, characterized in that after the step of bending the tab to the side facing the second tab receiving cavity, the bent tab is fixedly and/or electrically connected to the first tab post (21).
31. The method of claim 29, wherein the connecting the bare cell to the cap plate comprises:
Extending a lug of a bare cell from the first lug accommodating cavity between the first pole body (21) and the end cover main body (1) to one side of the end cover main body (1) away from the bare cell;
bending the tab to one side facing the second tab accommodating cavity;
connecting the first pole body (21) to a small-diameter section of a stepped hole or a conical hole of a first through hole (11) of the end cover main body (1), and enabling part of the structure of the first pole body (21) to be pressed on the bent pole lug;
the second pole body (22) is arranged on the large-diameter section of the stepped hole or the conical hole of the first through hole (11) so as to realize the electric connection between the second pole body (22) and the first pole body (21) and between the second pole body and the first pole lug (6).
32. The battery preparation method according to any one of claims 28-31, wherein the first tab (6) and the second tab (7) are respectively arranged on two opposite sides of the bare cell (8), and openings are respectively arranged on two opposite sides of the battery shell (9);
one of the first lug (6) and the second lug (7) of the bare cell is connected with the cover plate outside the shell (9), and the other lug is connected with the cover plate inside the shell (9); or, the first tab (6) and the second tab (7) of the bare cell are connected with the cover plate in the shell (9).
33. The battery manufacturing method according to claim 32, wherein a packing member (5) is sealed and pierced on each of the two second pole bodies (22), and each of the packing members (5) is fixedly connected to the corresponding end cap body (1), and each of the end cap bodies (1) is fixedly connected to the case (9).
34. The battery preparation method according to any of claims 28-31, the battery end cap (100) being provided with two of the posts (2); a first electrode lug (6) and a second electrode lug (7) are arranged on the same side of the bare cell (8);
the first electrode lug (6) and the second electrode lug (7) of the bare cell are connected with the cover plate outside the shell (9); or, the first tab (6) and the second tab (7) of the bare cell are connected with the cover plate in the shell (9).
35. The battery preparation method according to claim 34, wherein the packing members (5) are respectively sealed and fitted on the two second pole bodies (22), and each packing member (5) is fixedly connected with the end cap body (1), and the end cap body (1) is fixedly connected with the case (9).
CN202310969906.3A 2023-08-02 2023-08-02 Battery end cover, battery, electric equipment and preparation method of battery end cover Pending CN116845250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310969906.3A CN116845250A (en) 2023-08-02 2023-08-02 Battery end cover, battery, electric equipment and preparation method of battery end cover

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310969906.3A CN116845250A (en) 2023-08-02 2023-08-02 Battery end cover, battery, electric equipment and preparation method of battery end cover

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CN116845250A true CN116845250A (en) 2023-10-03

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