CN114899500A - Method for preparing cylindrical lithium ion battery with electrode lugs on same side of positive electrode and negative electrode - Google Patents

Method for preparing cylindrical lithium ion battery with electrode lugs on same side of positive electrode and negative electrode Download PDF

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Publication number
CN114899500A
CN114899500A CN202210606607.9A CN202210606607A CN114899500A CN 114899500 A CN114899500 A CN 114899500A CN 202210606607 A CN202210606607 A CN 202210606607A CN 114899500 A CN114899500 A CN 114899500A
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Prior art keywords
positive
negative
lugs
negative pole
pole
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CN202210606607.9A
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Chinese (zh)
Inventor
许刚
刘素娟
蒋亚东
高卫涛
刘国庆
王晓丹
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Tianjin Lishen Battery JSCL
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Tianjin Lishen Battery JSCL
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Priority to CN202210606607.9A priority Critical patent/CN114899500A/en
Publication of CN114899500A publication Critical patent/CN114899500A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • 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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

The invention relates to a method for preparing a cylindrical lithium ion battery with lugs on the same sides of a positive pole and a negative pole.A blank foil edge of a positive pole piece and a negative pole piece is cut into step-shaped positive pole and negative pole lugs with the same width, different heights and different distances, and a roll core on the same side of the positive pole and the negative pole lugs is prepared after winding, and the cylindrical lithium ion battery with the same sides of the positive pole and the negative pole lugs, which comprises the positive pole piece, the negative pole piece, a positive pole converging sheet, a negative pole converging sheet, an insulating sheet, a shell, a positive pole post and an explosion-proof sheet, which are wound and cut. Has the advantages that: the invention cuts the blank foil on the edges of the positive and negative pole pieces into positive and negative pole lugs with equal width, unequal height and unequal distance by laser, and the positive and negative pole lugs are wound to form a roll core, thereby increasing the coating width of the positive and negative pole pieces, improving the charge and discharge performance of the battery, simultaneously increasing the space utilization rate of the shell and improving the energy density of the battery.

Description

Method for preparing cylindrical lithium ion battery with electrode lugs on same side of positive electrode and negative electrode
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a preparation method of a cylindrical lithium ion battery with electrode lugs on the same sides of a positive electrode and a negative electrode.
Background
The existing cylindrical lithium ion battery generally adopts the opposite direction to draw out the positive and negative poles, all adopt the stainless steel outer casing to wrap up the lithium ion battery core, draw out the positive and negative poles from the closed outer casing, the positive pole is fixed in the cover plate, the negative pole is fixed at the bottom of outer casing, its complexity of process, apparatus capital input, the leakproofness of the outer casing are bad, this will influence life-span and performance of the whole battery. The cylindrical battery generally adopts a mode that positive and negative lugs are respectively arranged at two ends, namely a single-lug structure, a double-lug structure or a multi-lug structure. The space occupancy of the positive and negative electrode tab assembly connection mode is too high, and under the condition that the height of the battery is certain, the requirement on the coating width of the battery pole piece is often reduced, which leads to poor performance of the battery. The space utilization rate of the lithium ion battery is improved, the coating width of a pole piece is increased, the current collecting area is increased, the contact resistance is reduced, the heat dissipation function of the battery is improved, the potential safety hazard of the battery is reduced, and the like. The lithium battery industry has been developing lithium ion batteries with cylindrical positive and negative electrodes led out in the same direction. Patent document No. CN 205488367U discloses a lithium ion battery with cylindrical positive and negative electrodes led out in the same direction, which includes: casing, lithium ion battery core, apron, electrode post, electrode lug and rubber backing plate, lithium ion battery core rigid coupling inside the casing, the electrode post from the top pass rubber backing plate and apron in proper order, the electrode post passes through the retainer plate to be fixed on rubber backing plate and apron, electrode lug upper end pass through the punching press rigid coupling on the electrode post, the lower extreme welding is on lithium ion battery core's electrode, the upper and lower terminal surface in the rubber backing plate outside all be protruding circle, casing top downwarping bordure, casing upper portion punching press is fluted, the apron be located the casing crooked bordure and the casing recess between. Patent document No. CN209169317U discloses a cylindrical polymer lithium ion battery cell with a tab outlet, which includes: the battery comprises a positive pole piece and a negative pole piece, wherein a positive pole electricity collecting net is arranged on the inner end face of the positive pole piece, a negative pole electricity collecting net is arranged on the inner end face of the negative pole piece, the positive pole piece and the negative pole piece are wound into a cylindrical battery cell in the same core, a diaphragm layer is wrapped on the outer layer of the battery cell, an aluminum-plastic packaging film is wrapped on the outer layer of the diaphragm layer, the battery cell is wrapped through the aluminum-plastic packaging film, a positive pole lug is arranged on the upper end of the positive pole piece, a negative pole lug is arranged on the upper end of the negative pole piece, and the positive pole lug and the negative pole lug are on the same side of the battery cell. Patent document with publication number CN 210956891U discloses a battery with an oval lithium ion structure, which comprises an electric core, a packaging film coated outside the electric core, and a positive electrode tab and a negative electrode tab arranged on the side wall of the electric core, wherein the positive electrode tab and the negative electrode tab are parallel to each other and have the same orientation, the cross section of the electric core is oval, and the positive electrode tab and the negative electrode tab are located at the position of the short axis of the oval.
The process for extracting the lithium ion battery from the cylindrical positive electrode and the cylindrical negative electrode in the same direction in the prior art is complex, the transformation investment of some production lines is large, the actual operation is difficult, and the popularization and the application are not facilitated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing a cylindrical lithium ion battery with lugs on the same sides of a positive electrode and a negative electrode, which can greatly reduce the space proportion occupied by components, increase the contact area between a positive electrode collector piece and a negative electrode collector piece and the lugs, increase the current conduction area, reduce the contact resistance and improve the safety performance of the battery.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for preparing a cylindrical lithium ion battery with positive and negative electrode same-side lugs comprises the following steps of cutting blank foil edges of positive and negative electrode plates into step-shaped positive and negative electrode lugs with the same width, different heights and different distances, and winding to obtain a roll core with the positive and negative electrode lugs at the same sides, wherein the steps are as follows: the cylindrical lithium ion battery comprises a winding core formed by winding, cutting and overlapping a positive electrode plate, a negative electrode plate, an insulating sheet, a shell and a positive electrode pole,
(1) laser cutting: the edges of the blank foils of the positive and negative pole pieces after laser cutting are in a step shape with the same width, different heights and different distances, and the edge of the blank foil close to the center of the roll core is superposed with the coating interfaces/ceramic glue of the positive and negative pole pieces;
(2) winding: the positive and negative electrode tabs cut by laser are respectively distributed on two sides of a winding core shaft after being wound and are not overlapped with each other, the end surface of the winding core formed after the positive and negative electrode tabs are wound and cut is divided into a central electrodeless ear area, a positive electrode ear area and a negative electrode ear area, wherein the central electrodeless ear area is provided with an insulating sheet for isolating the positive and negative electrodes, and winding cores with the positive and negative electrode tabs positioned at the same end and respectively occupying 1/2 are formed after being wound;
(3) welding: the insulating sheet and the roll core are sequentially put into the shell, the anode tab penetrates through the insulating sheet, the anode tab and the cathode tab are isolated in the axial direction of the insulating sheet, the anode tab and the cathode tab are respectively kneaded and treated, the anode tab and the cathode tab are respectively fixedly connected with the anode bus bar sheet and the cathode bus bar sheet, one end of the cathode bus bar sheet, which is far away from the central shaft of the roll core, is fixedly connected with the inner wall of the shell, the arc nail of the anode bus bar sheet is fixedly connected with the anode pole column and the cover plate, and the cover plate is fixedly connected with the periphery of the upper opening of the shell to manufacture the cylindrical lithium ion battery with the anode tab and the cathode tab on the same side.
Furthermore, the shape of the insulating sheet is semicircular, and the side wall of the insulating sheet is higher than the height of the flattened anode tab and lower than the protruding height of the arc nail of the anode afflux sheet.
Furthermore, arc-shaped welding grooves are respectively formed in the surfaces, far away from the winding core, of the positive and negative bus plates, and the protruding sides of the grooves are close to the tabs.
Has the advantages that: the invention cuts blank foils at the edges of the positive and negative pole pieces into different widths by laser to form the positive and negative pole pieces with stepped edges; the positive and negative pole pieces are cut into positive and negative pole lugs with equal width, unequal height and unequal distance by laser, a roll core is formed by winding, and the positive and negative pole lugs at the end face of the roll core respectively occupy approximately half positions. According to the invention, the shell is welded on the side wall of the negative pole bus piece, the positive pole bus piece is linearly connected with the positive pole post, the space proportion occupied by the components is greatly reduced, the positive pole bus piece and the negative pole bus piece are in large-area contact with the pole lugs, the negative pole bus piece is directly connected with the shell, the current conduction area is increased, the contact resistance is reduced, the heat dissipation is increased, and the safety performance of the battery is improved; the negative pole piece that converges links to each other with the casing, also is favorable to battery pack. The invention changes the whole design structure of the cylindrical lithium ion battery, thereby changing the manufacturing process of the battery.
Drawings
FIG. 1 is a schematic view of the overall structure of a battery in the embodiment;
FIG. 2 is a schematic diagram of a blank foil with stepped edges of an example pole piece;
fig. 3 is a schematic diagram of the electrode lug with equal width, unequal distance and unequal height of the pole pieces in the embodiment;
FIG. 4 is a schematic structural view of a core in the embodiment;
FIG. 5 is a schematic structural diagram of a bus bar in the embodiment;
FIG. 6 is a schematic structural view of a positive electrode post in the example;
FIG. 7 is a schematic structural diagram of the rupture disk in the embodiment.
In the figure: 1-a steel shell, 2-a positive pole, 3-a positive current collector, 4-a positive current collector middle arc nail, 5-a negative current collector, 6-a shell side wall welding line, 7-an insulating sheet, 8-a pole piece, 9-a step-shaped blank foil, 10-ceramic glue, 11-unequal intervals, unequal heights, equal width pole lugs, 12-a negative pole lug area, 13-a positive pole lug area, 14-a non-polar lug area, 15-a positive and negative current collector lug welding groove, 16-an aluminum rivet, 17-an inner insulating sheet, 18-an outer insulating sheet, 19-an aluminum riveting pad, 20-a reinforcing rib and 21-a score line.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
In various embodiments of the present invention, for convenience in description and not in limitation, the term "coupled" as used in the specification and claims of the present application is not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
The invention provides a method for preparing a cylindrical lithium ion battery with positive and negative electrode same-side lugs, which comprises the following steps of cutting the edge of a blank foil of positive and negative electrode plates into step-shaped positive and negative electrode lugs with the same width, different heights and different distances, and winding to obtain a roll core with the positive and negative electrode lugs at the same side, wherein the steps are as follows: the cylindrical lithium ion battery comprises a winding core formed by winding and cutting positive and negative pole pieces, a positive pole bus sheet 3, a negative pole bus sheet 5, an insulating sheet 7, a steel shell body 1, a positive pole post 2 and an explosion-proof sheet,
(1) laser cutting: the edges of the blank foils of the positive and negative pole pieces after laser cutting are in a step shape with the same width, different heights and different distances, and the edge of the blank foil close to the center of the roll core is superposed with the coating interface/ceramic adhesive 10 of the positive and negative pole pieces;
(2) winding: the positive and negative electrode tabs cut by laser are respectively distributed on two sides of a winding core shaft after being wound and are not overlapped with each other, the end surface of the winding core formed after the positive and negative electrode tabs are wound and cut is divided into a central electrodeless ear area 14, a positive electrode ear area 13 and a negative electrode ear area 12, wherein the central electrodeless ear area is provided with an insulating sheet for isolating the positive and negative electrodes, and winding cores with the positive and negative electrode tabs positioned at the same end and respectively occupying 1/2 are formed after being wound;
(3) welding: the insulating sheet and the roll core are sequentially put into the shell, the anode tab and the cathode tab penetrate through the insulating sheet, the anode tab and the cathode tab are isolated in the axial direction of the insulating sheet, the anode tab and the cathode tab are respectively kneaded and processed, the anode tab and the cathode tab are respectively welded with the anode bus sheet and the cathode bus sheet, one end, away from the central shaft of the roll core, of the cathode bus sheet is welded with the inner wall of the shell, the arc nail of the anode bus sheet is welded with the anode tab and the cover plate, and the cover plate is fixedly connected with the periphery of the upper opening of the shell to manufacture the cylindrical lithium ion battery with the anode tab and the cathode tab on the same side.
Furthermore, the shape of the insulating sheet is semicircular, and the side wall of the insulating sheet is higher than the height of the anode tab after being flattened and lower than the height of the convex of the arc nail of the anode afflux sheet.
Furthermore, the surface, away from the roll core, of the positive and negative bus plates is respectively provided with a circular arc welding groove, and the protruding side of the groove is close to the tab, so that the flow guide is facilitated.
The manufacturing process of the embodiment will be described in detail with reference to the accompanying drawings
A structure that positive and negative electrode homonymy utmost point ear is used for cylindrical lithium ion battery, including the step-like blank foil pole piece 9, fig. 2 shows; the lugs 11 are not equidistant, not high and wide, and are shown in figure 3; a winding core formed by winding the positive and negative pole pieces of the step-shaped blank foil is shown in figure 4; the steel shell 1 is internally provided with a roll core and an insulating sheet, a plurality of positive lugs of the positive plate and a plurality of negative lugs of the negative plate are positioned on the same end surface, and the positive lugs and the negative lugs are respectively arranged on the positive plate and the negative plate discontinuously and discontinuously.
As shown in fig. 5, the insulating sheet 7 of the present invention is placed at the junction of the positive and negative electrode tabs, the positive and negative current collecting sheets, and the positive electrode tabs and the casing wall, and is used for rubbing and leveling the positive and negative electrode tabs, wherein the insulating sheet has a certain height, the height of the positive pole converging piece is slightly higher than the kneaded positive pole lug and the side wall of the positive pole converging piece and is slightly lower than the circular arc nail 4 in the positive pole converging piece, so that the positive pole converging piece and the positive pole lug are prevented from contacting with the shell wall, the connection of the circular arc nail and the surface of the positive pole post is facilitated, the positive pole converging piece and the negative pole converging piece are connected with the positive pole lug and the negative pole lug in a welding way through groove parts, the positive pole converging piece and the negative pole converging piece correspond to the positive pole lug and the negative pole lug respectively, the negative pole converging piece is connected with the side wall of the shell in a welding way, as shown in the figure, the welding line 6 of the side wall of the shell and the positive pole confluence sheet are connected with the positive pole column through the arc nail, so that the space occupied by the connection of the pole lugs, the confluence sheet and the cover plate is reduced, and the energy density of the produced battery can be improved to a certain extent.
As shown in fig. 5, the positive and negative electrode lug surfaces of the winding core are respectively and fixedly connected with a positive electrode collector sheet 3 and a negative electrode collector sheet 5, one ends of the positive and negative electrode collector sheets, which are far away from the winding core, are respectively provided with a lug welding groove 15, the grooves are circular and are made by mechanical stamping, so that a circular protrusion is formed on the back of the groove of the positive and negative collector sheets. The positive and negative echelonment pole piece is coiled to form a coiled core, the pole lug is higher in end surface balance after being kneaded flatly, the positive bus sheet is more attached to the positive pole lug, the groove of the end surface of the positive bus sheet is aligned to the positive pole lug, the circular bulge of the back surface corresponding to the groove is contacted with the positive pole lug, the groove of the end surface of the negative bus sheet is aligned to the negative pole lug, the circular bulge of the back surface corresponding to the groove is contacted with the negative pole lug, and the positive and negative bus sheets are fixed with the positive and negative pole lugs through laser welding. The circular orbit for laser welding of recess, the bus bar piece terminal surface sets up the recess, can contact the arch that the bus bar piece formed through the recess on the one hand with utmost point ear, has reduced the rosin joint area between bus bar piece and the utmost point ear to a certain extent, has further improved the welding strength between bus bar piece and the utmost point ear, and the regional orbit of laser welding is injectd to the other hand, the technology processing operation of being convenient for.
As shown in fig. 6-7, the surface of the open cover plate is provided with a positive pole connected with the positive bus bar arc nail, and the structure of the positive pole is as follows: the aluminum product rivet 16, the inner insulation sheet 17, the steel product shell 1, the outer insulation sheet 18 and the aluminum product rivet pad 19 are fixedly connected through the anode rivet, and under the mutual matching action of the structures, the insulation distribution between the anode post and the shell can be realized; the sealing end cover is provided with an explosion-proof function, the outer surface of the cover plate is provided with grooves which are reinforcing ribs 20 and enable the battery not to be easily deformed when being extruded by external force, and the inner side of the cover plate is provided with a structure with a score line 21 to play a role in pressure relief and reduce explosion risks.
The manufacturing process of the invention comprises the following steps:
respectively carrying out laser cutting blank foil operation on positive and negative electrode plates, wherein the blank foil of the cut electrode plates is in a step shape with unequal width, respectively carrying out laser cutting on positive and negative electrode lugs, forming a plurality of lugs with unequal height, unequal distance and equal width on the positive and negative electrode plates, and winding and forming the cut lugs and a diaphragm to form winding cores with the positive and negative electrode lugs at the same end and respectively occupying 1/2;
and step two, the positive pole lug penetrates through the insulating sheet, the positive pole lug and the negative pole lug are separated by the axial insulating part of the insulating sheet, the positive pole lug and the negative pole lug of the winding core are respectively treated by kneading, and the positive pole lug, the negative pole convergence sheet, the positive pole lug and the shell wall are isolated by the insulating sheet.
Welding positive and negative converging sheets with positive and negative electrode tabs respectively, and sequentially putting an insulating pad and a winding core into a shell;
and step four, welding the negative bus bar and the inner wall of the shell by laser welding, then fixedly connecting the cover plate and the positive bus bar by the positive pole, and finally connecting the cover plate and the shell by peripheral welding.
The welding mode is one or more of ultrasonic welding, resistance welding, laser welding and friction welding, the arc nail is higher than the side wall welding side edge of the negative electrode bus bar, and the plane arc nail is also beneficial to balancing the cover plate.
As shown in fig. 2-4, in the first step, the positive and negative electrode sheets are cut into a required step-like blank foil structure by laser by adjusting parameters of a laser sheet making machine, then required tabs are cut by laser, the positive and negative electrode tabs after laser cutting are all formed into shapes with unequal distance, equal width and unequal height, after the positive and negative electrode tabs are rolled with a diaphragm together to form a roll core, as shown in fig. 4, a positive and negative electrode tab area and a central non-tab area are formed on one end surface of the roll core, a tab flattening process in the prior art is used, and the rolled tabs are flattened, so that the full tabs in the prior art form the positive and negative electrode tab areas in the invention, and because of the design of unequal height, unequal distance and equal width of the tabs, a certain gap exists between the rolled electrode sheets, so that the electrolyte can rapidly flow into and infiltrate the rolled positive and negative electrode sheets.
As shown in fig. 5, in the second step, the positive and negative electrode tabs are wound to form a winding core, the positive and negative electrode tabs of the winding core are fixedly connected to the positive and negative bus sheets respectively, and the ends of the positive and negative bus sheets, which are far away from the winding core, are provided with grooves, which are circular and are made by stamping, so that a circular protrusion is formed on the back of each groove of the positive and negative bus sheets. The positive and negative stepped pole pieces are wound to form a winding core, the balance degree is high after the pole lugs are rubbed flat, the positive confluence piece is more attached to the positive pole lug, the groove of the end face of the positive confluence piece is aligned with the positive pole lug, the circular protrusion of the groove, corresponding to the back face, is in contact with the positive pole lug, the groove of the end face of the negative confluence piece is aligned with the negative pole lug, the circular protrusion of the groove, corresponding to the back face, is in contact with the negative pole lug, and the positive and negative confluence pieces are fixed with the positive and negative pole lugs through laser welding. The circular orbit for laser welding of recess, the bus bar piece terminal surface sets up the recess, can contact the arch that the bus bar piece formed through the recess on the one hand with utmost point ear, has reduced the rosin joint area between bus bar piece and the utmost point ear to a certain extent, has further improved the welding strength between bus bar piece and the utmost point ear, and the regional orbit of laser welding is injectd to the other hand, the technology processing operation of being convenient for.
As shown in fig. 7, the steel shell sealing end cap in step three, the inner side of the end cap is provided with an insulating pad or an insulating adhesive tape, the end cap is provided with an explosion-proof function, the outer surface of the cover plate is provided with a groove for a reinforcing rib, the battery can be prevented from being deformed easily when being extruded by external force, the inner side of the cover plate is provided with a nick line structure, the pressure relief effect is achieved, and the explosion risk is reduced.
As shown in fig. 1 and 6, the surface of the cover plate is provided with a positive post connected with a positive arc nail, and the positive post has the structure that: pad is riveted to aluminum product rivet, interior insulating piece, steel casing, outer insulating piece, aluminum product, the anodal post passes through the positive rivet and fixes linking to each other, under the mutually supporting effect between above-mentioned each structure, can realize insulating distribution between anodal post and the casing, and negative pole conflux piece links to each other with the box hat, and the box hat casing all can regard as the negative pole post with upper and lower apron.
When the structure is used, a winding core with positive and negative lugs having unequal intervals, unequal heights and equal widths is formed by winding the positive and negative pole pieces with lugs at one ends, the positive and negative lugs of the winding core are kneaded and welded, the positive and negative lugs on the winding core are respectively welded and fixed with the positive and negative bus plates, the negative bus plate is welded with the side wall of the steel shell, the positive bus plate is welded and connected with the positive post of the cover plate through the arc nail, and the cover plate is matched with the opening of the shell and is welded and fixed at the periphery.
In the cylindrical lithium ion battery in the prior art, a roll core generally adopts a mode of leading lugs from two ends, and the two ends of the battery need to be sealed no matter single-pole lugs, multi-pole lugs or full lugs, so that the process is complicated and the cost is higher. Compared with the pole pieces of the full pole ear in the prior art, the invention increases the laser cutting of the blank foil parts of the positive and negative pole pieces, and the blank foils of the positive and negative pole pieces are in a step-shaped structure by the laser cutting, then the pole lugs are kneaded and welded, one end of a roll core formed by winding the positive and negative pole pieces can form a positive and negative pole lug area, the negative pole confluence piece is designed into a structure which is welded with the side wall of the steel shell by laser, this structure has increased water conservancy diversion area, the heat radiating area of electric current, has reduced battery resistance, does benefit to battery pack, and anodal confluence piece center sets up the circular arc nail of take the altitude, and the circular arc design can increase its and anodal utmost point post aluminium rivet's area of contact, highly is slightly higher than negative pole confluence piece side height, can improve battery production efficiency greatly.
The above detailed descriptions of the method for manufacturing a cylindrical lithium ion battery with positive and negative electrode tabs on the same side with reference to the embodiments are illustrative and not restrictive, and several embodiments can be enumerated according to the limited scope, so that variations and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.

Claims (3)

1. A preparation method of a cylindrical lithium ion battery with electrode lugs on the same sides of a positive electrode and a negative electrode is characterized by comprising the following steps: cutting the edges of blank foils of the positive and negative pole pieces into step-shaped positive and negative pole lugs with the same width, different heights and different distances, and winding to obtain a roll core with the same side of the positive and negative pole lugs, wherein the specific steps are as follows: the cylindrical lithium ion battery comprises a winding core formed by winding, cutting and overlapping a positive electrode plate, a negative electrode plate, an insulating sheet, a shell and a positive electrode pole,
(1) laser cutting: the edges of the blank foils of the positive and negative pole pieces after laser cutting are in a step shape with the same width, different heights and different distances, and the edge of the blank foil close to the center of the roll core is superposed with the coating interfaces/ceramic glue of the positive and negative pole pieces;
(2) winding: the positive and negative electrode tabs cut by laser are respectively distributed on two sides of a winding core shaft after being wound and are not overlapped with each other, the end surface of the winding core formed after the positive and negative electrode tabs are wound and cut is divided into a central electrodeless ear area, a positive electrode ear area and a negative electrode ear area, wherein the central electrodeless ear area is provided with an insulating sheet for isolating the positive and negative electrodes, and winding cores with the positive and negative electrode tabs positioned at the same end and respectively occupying 1/2 are formed after being wound;
(3) welding: the insulating sheet and the roll core are sequentially put into the shell, the anode tab penetrates through the insulating sheet, the anode tab and the cathode tab are isolated in the axial direction of the insulating sheet, the anode tab and the cathode tab are respectively kneaded and treated, the anode tab and the cathode tab are respectively fixedly connected with the anode bus bar sheet and the cathode bus bar sheet, one end of the cathode bus bar sheet, which is far away from the central shaft of the roll core, is fixedly connected with the inner wall of the shell, the arc nail of the anode bus bar sheet is fixedly connected with the anode pole column and the cover plate, and the cover plate is fixedly connected with the periphery of the upper opening of the shell to manufacture the cylindrical lithium ion battery with the anode tab and the cathode tab on the same side.
2. The method for preparing a cylindrical lithium ion battery with electrode lugs on the same sides of a positive electrode and a negative electrode as in claim 1 is characterized in that: the shape of the insulating sheet is semicircular, and the side wall of the insulating sheet is higher than the height of the anode tab after being kneaded and is lower than the protruding height of the arc nail of the anode confluence sheet.
3. The method for preparing a cylindrical lithium ion battery with electrode lugs on the same sides of a positive electrode and a negative electrode as in claim 1 is characterized in that: the surface, far away from the roll core, of the positive and negative pole bus sheet is respectively provided with an arc-shaped welding groove, and the protruding side of each groove is close to a pole lug.
CN202210606607.9A 2022-05-31 2022-05-31 Method for preparing cylindrical lithium ion battery with electrode lugs on same side of positive electrode and negative electrode Pending CN114899500A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115275529A (en) * 2022-09-27 2022-11-01 楚能新能源股份有限公司 Cylindrical lithium ion battery and preparation process thereof
CN115411465A (en) * 2022-09-21 2022-11-29 深圳市赛尔摩星科技有限公司 Cylindrical battery, battery module and electric device
CN115513607A (en) * 2022-11-24 2022-12-23 香港中文大学（深圳） Low-loss and high-space utilization rate lithium ion battery full-tab structure and preparation method thereof
CN116779986A (en) * 2023-08-18 2023-09-19 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115411465A (en) * 2022-09-21 2022-11-29 深圳市赛尔摩星科技有限公司 Cylindrical battery, battery module and electric device
CN115275529A (en) * 2022-09-27 2022-11-01 楚能新能源股份有限公司 Cylindrical lithium ion battery and preparation process thereof
CN115513607A (en) * 2022-11-24 2022-12-23 香港中文大学（深圳） Low-loss and high-space utilization rate lithium ion battery full-tab structure and preparation method thereof
CN115513607B (en) * 2022-11-24 2023-03-10 香港中文大学（深圳） Low-loss and high-space utilization rate lithium ion battery full-tab structure and preparation method thereof
CN116779986A (en) * 2023-08-18 2023-09-19 深圳海辰储能控制技术有限公司 Energy storage device and electric equipment

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