CN112054236A - Storage battery and manufacturing method thereof - Google Patents
Storage battery and manufacturing method thereof Download PDFInfo
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- CN112054236A CN112054236A CN202011064410.4A CN202011064410A CN112054236A CN 112054236 A CN112054236 A CN 112054236A CN 202011064410 A CN202011064410 A CN 202011064410A CN 112054236 A CN112054236 A CN 112054236A
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
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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
- 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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
- H01M2004/027—Negative electrodes
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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Abstract
The invention relates to a storage battery and a manufacturing method thereof, and belongs to the technical field of batteries. The storage battery comprises a hollow metal shell, a plurality of cylindrical current-collecting winding cores, an upper cover plate assembly and a lower cover plate assembly, wherein the upper cover plate assembly and the lower cover plate assembly seal openings at two ends of the metal shell; the cylindrical current-collecting winding core comprises a metal tube, a cylindrical winding core, a positive current-collecting disc, a negative current-collecting cap and a negative guard ring; the empty foil area of the positive plate of the cylindrical winding core is shaped into a cross shape, and the empty foil in the cross-shaped area is welded with the positive current collecting disc; shaping the empty foil area of the negative plate into a designed shape, and welding the empty foil on the edge of the designed shape with the negative current collecting cap; a plurality of positive current collecting plates are welded with the positive current collecting plates, and the positive current collecting plates are welded with the positive cover plate; the negative pole current collecting cap is welded with the negative pole current collecting piece, and the negative pole current collecting piece is connected with the negative pole cover plate. The welding of the negative foil and the current collector is carried out by adopting ultrasonic welding instead of laser welding, so that the generation of welding slag is reduced, the consistency of the battery is greatly improved, and the self-discharge and short-circuit risks of the battery are reduced.
Description
Technical Field
The invention relates to a storage battery and a manufacturing method thereof, in particular to a structure of the storage battery and a manufacturing method thereof, and belongs to the technical field of batteries.
Background
As is well known, compared with a small-capacity battery, a large-capacity battery has the disadvantages of high processing difficulty, low yield, high cost, difficult heat dissipation, poor rate performance, short cycle life and poor safety. In order to reduce the internal resistance of the battery and improve the power performance, the high-capacity cylindrical battery usually adopts a full-lug design, and the diversion is realized in a laser welding and confluence plate welding mode although the structures and the shapes of the end faces of the full lugs are different. According to patent CN110600795A, tabs are arranged at two ends of a winding core, one end is a positive electrode tab, the other end is a negative electrode tab, and the end surface of the winding core tab is an annular step surface; the current collecting discs of the positive electrode and the negative electrode are provided with circular grooves which are welding areas; and the annular step surface on the tab is attached to the annular groove on the current collecting disc for welding. And a positive current collecting plate is welded at the vibration level of the positive end face of the patent CN204947019U, and a negative current collecting plate is welded at the vibration level of the negative end face. In patent CN204927432U, the optical foil area of the negative plate is welded to one end of the negative current guiding disk, and the other end of the negative current guiding disk is welded to the bottom of the casing. Patent CN203481318U is through cutting out uncoated district pole piece, and the electric connection of utmost point ear and apron of being convenient for can effectively prevent rosin joint, the phenomenon of impaling. The structure of these patents can only realize the welding of the full tab end face and the current collecting plate by laser welding. Because the welding slag of the laser welding process is inevitably splashed, the welding slag is difficult to clean, and the self-discharge can be increased after the welding slag enters the battery, even the short circuit is caused.
Disclosure of Invention
In order to solve the problems, the invention provides a storage battery and a manufacturing method thereof. The storage battery comprises a hollow metal shell with openings at two ends, a plurality of cylindrical current-collecting winding cores arranged in the metal shell, and an upper cover plate assembly and a lower cover plate assembly which are respectively arranged at two ends of the metal shell and seal the openings at two ends of the metal shell; the upper cover plate assembly comprises a negative cover plate, a negative insulation heat-conducting fin, a negative insulation support and a negative bus bar; the lower cover plate component comprises a positive cover plate, a positive insulating bracket and a positive bus bar; the cylindrical current-collecting winding core comprises a metal tube, a cylindrical winding core, a positive current-collecting disc, a negative current-collecting cap and a negative guard ring; the cylindrical winding core is of a multilayer winding structure formed by winding a positive plate, a diaphragm, a negative plate and the diaphragm in sequence, and an adhesive tape is pasted on the outermost ring; the positive plate empty foil area and the negative plate empty foil area are respectively positioned at two ends of the cylindrical winding core; one side of the positive plate is a positive plate coating area coated with a positive material, and the other side of the positive plate is a blank positive plate foil area; one side of the negative plate is a negative plate coating area coated with a negative material, and the other end of the negative plate is a blank negative plate empty foil area; the positive plate empty foil area and the negative plate empty foil area are respectively positioned at two ends of the cylindrical winding core, the positive end empty foil area is shaped into a cross shape, and the empty foil in the cross-shaped area is welded with the positive current collecting disc; shaping the negative electrode end empty foil area into a designed shape, and welding the empty foil at the edge of the designed shape with the negative electrode current collecting cap; a plurality of positive current collecting plates are welded with the positive current collecting plates, and the positive current collecting plates are welded with the positive cover plate; and the negative electrode current collecting caps are welded with the negative electrode current collecting pieces, and the negative electrode current collecting pieces are connected with the negative electrode cover plate.
The invention discloses a storage battery which comprises a metal shell, a plurality of cylindrical current-collecting winding cores, an anode cover plate, a cathode cover plate, an anode current-collecting sheet, a cathode current-collecting sheet, an anode insulating support, a cathode insulating support and a cathode insulating heat-conducting sheet.
The empty foil area of the positive plate at the positive end of the cylindrical winding core is shaped into a cross shape and is welded with the positive current collecting disc into a whole through laser welding; and the cylindrical winding core is placed into the metal tube in the direction that the positive electrode faces the bottom of the metal tube.
The design shape of the shaping of the negative plate empty foil area at the negative end of the cylindrical winding core can be rectangular or circular, and is not limited to the types; the remaining edge empty foil area after the shaping of the negative electrode end of the winding core is a plurality of arc areas or a circle. Sleeving a negative electrode retainer at the negative electrode end of the cylindrical winding core, and supporting and positioning the negative electrode retainer by the upper edge of the metal tube; then a negative current collecting cap is put on the negative guard ring, so that the lower edge of the current collecting cap is embedded into the guard ring groove for positioning; and then the hollow foil area at the edge of the designed shape is compressed and welded with the inner wall of the negative current collecting cap through ultrasonic welding, and the welding shape is arc.
Placing a positive insulating support, and welding the positive bus bar with the welding surface of the positive current collecting plate of the cylindrical current collecting winding core and the annular bottom surface of the metal pipe one by one, or welding the positive bus bar with the welding surface of the positive current collecting plate of the cylindrical current collecting winding core and the annular bottom surface of the metal pipe one by one; then placing a positive electrode insulating bracket above or below the confluence sheet; and welding the positive pole confluence sheet with the positive pole cover plate.
The negative current collecting sheet is welded with the welding surface of the negative current collecting cap of the cylindrical current collecting winding core one by one; then placing a negative electrode insulating support above the bus bar; and then the negative pole afflux sheet is connected with the negative pole cover plate.
The welding surface of the negative current collecting cap can be the upper surface of the current collecting cap or an arc side surface.
The positive terminal of the battery can also be manufactured by the same method as the negative terminal.
The positive current collecting plate, the positive current collecting sheet and the metal tube with the bottom are made of the same material; the negative current collecting cap and the negative current collecting plate are made of any one or two metal materials of copper, copper alloy, copper nickel plating, carbon steel, nickel and nickel alloy.
The cylindrical current collecting roll core in the storage battery is composed of positive and negative poles of the same system, such as any one of chemical power supplies of a lithium iron phosphate-graphite roll core, a lithium manganate-graphite roll core, a nickel cobalt lithium manganate-graphite roll core, a lithium cobaltate-lithium titanate roll core, a lithium manganate-lithium titanate roll core, a super capacitor roll core, a metal hydride-nickel roll core, a cadmium-nickel roll core, a zinc-nickel roll core and the like, and is not limited to the system.
Meanwhile, the cylindrical winding core in the storage battery can be combined by winding cores of different material systems, such as a lithium manganate-graphite winding core and a nickel cobalt lithium manganate-graphite winding core, a power type super capacitor winding core and an energy type lithium ion winding core of the same type of positive electrode material, and the like. Two types of winding cores with different characteristics are combined in parallel to form a high-capacity battery, so that the performance is improved, and the cost is reduced.
It should be noted that, different battery systems are suitable for different types of metals, which belongs to the known technology in the industry, for example, lithium ion batteries adopt aluminum as the material of the metal housing and the metal tube, and the anode matrix of the cylindrical winding core is aluminum foil, and the cathode matrix is copper foil; for example, super capacitors and batteries using lithium titanate as a negative electrode material adopt aluminum as a material of a metal shell and a metal tube, and the positive electrode and the negative electrode substrates of a cylindrical roll core are both aluminum foils; stainless steel or other materials can also be used as the material of the metal shell and the metal tube.
The processing method of the storage battery comprises the following steps:
(1) arranging a positive electrode material layer on one side of a positive electrode plate of the positive electrode plate to form a positive electrode plate coating area, and leaving a blank on the other side to form a positive electrode plate blank area;
(2) arranging a negative electrode material layer on one side of a negative electrode plate of the negative electrode plate to form a negative electrode plate coating area, and leaving a blank on the other side to form a negative electrode plate blank area;
(3) winding the positive plate, the negative plate and the diaphragm according to the order of the positive plate, the diaphragm, the negative plate and the diaphragm to form a cylindrical winding core, and respectively reserving a positive plate empty foil area and a negative plate empty foil area at two ends of the cylindrical winding core;
(4) shaping the empty foil area of the positive plate at the positive end of the cylindrical winding core into a cross shape, and welding the empty foil area of the positive plate and the positive current collecting plate into a whole through laser welding; putting the cylindrical winding core into the metal tube in a direction that the anode faces the bottom of the metal tube;
(5) shaping the empty foil area of the negative plate at the negative end of the cylindrical winding core into a designed shape, sleeving a negative guard ring at the negative end of the cylindrical winding core, and supporting and positioning by the upper edge of the metal tube; then a negative current collecting cap is put on the negative guard ring, so that the lower edge of the current collecting cap is embedded into the guard ring groove for positioning; then the hollow foil area at the edge of the designed shape is compressed and welded with the inner wall of the negative current collecting cap through ultrasonic welding, and the welding shape is arc;
(6) welding the positive current collecting sheet with the welding surface of the positive current collecting disc of the current collecting cylindrical winding core and the annular bottom surface of the metal pipe one by one; welding the negative current collecting sheet and the welding surface of the negative current collecting cap of the cylindrical current collecting winding core one by one; forming a cylindrical winding core group;
(7) assembling the welded cylindrical winding core into a metal shell;
(8) then placing a positive electrode insulating bracket above or below the positive electrode bus bar; welding the positive pole confluence piece with the positive pole cover plate;
(9) the metal shell and the anode cover plate are welded in a sealing way;
(10) placing a negative electrode insulating support above the negative electrode bus bar; then connecting the negative pole afflux sheet with the negative pole cover plate;
(11) welding the negative cover plate and the metal shell in a sealing way;
(12) baking the battery, injecting electrolyte, forming and sealing.
The application has the following technical effects and advantages:
the welding of the negative foil and the current collector is carried out by adopting ultrasonic welding instead of laser welding, so that the generation of welding slag can be reduced, the consistency of the battery is greatly improved, and the self-discharge and short-circuit risks of the battery are reduced.
Drawings
Fig. 1 is an exploded view of a battery of the present invention.
Fig. 2 is a perspective view of the secondary battery of the present invention.
Fig. 3 is a schematic view showing the installation of the positive, negative and insulating frames of the secondary battery of the present invention.
Fig. 4a-4e are schematic views illustrating welding of the negative electrode bus bar of the secondary battery of the present invention.
Fig. 5 is a schematic view illustrating welding of the positive electrode bus bar of the secondary battery according to the present invention.
Fig. 6a-6b are exploded views of a cylindrical current collecting core of the present invention.
Fig. 7 is a cross-sectional view of a cylindrical current collecting core of the present invention.
Fig. 8a-8b are schematic negative end weld views of a cylindrical current collecting core according to the present invention.
Fig. 9 is a schematic view of the positive end weld of the cylindrical current collecting core of the present invention.
FIG. 10 is a schematic view of a cross-shaped end shaping positive slot of the present invention.
Fig. 11a-11b are schematic diagrams of the end-shaped negative middle rectangular and circular grooves of the present invention.
Fig. 12a-12e are schematic views of a negative bus bar of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the drawing, 1 is an upper cover plate, 2 is a negative insulating and heat conducting sheet, 3 is a negative bus bar (including five types 3a-3 e), 4 is a negative insulating frame, 5 is a metal shell, 6 is a cylindrical current collecting core, 7 is a positive insulating frame, 8 is a positive bus bar, 9 is a lower cover plate, 11 is a negative pole column, 12 is a liquid injection port, 13 is a positive pole column, 14 is an explosion-proof valve, 31-35 are welding positions of the negative bus bar and the negative current collecting cap, 61 is a core body, 62 is a metal pipe, 63 is a negative current collecting cap (including 63a and 63 b), 64 is a retainer, 65 is a positive current collecting disc, 631 is a welding position of the negative current collecting cap and a foil, 632 is a welding position of the negative current collecting cap and a bus bar, 633 is another welding position of the negative current collecting cap and the bus bar, 651 is another welding position of the positive disc and the foil, 652 is a welding position of the positive disc and the bus bar, and 81 is the welding position of the positive current collecting sheet and the negative current collecting cap, and 82 is the welding position of the positive current collecting sheet.
As shown in the figure, the overall technical scheme of the storage battery is as follows: the device comprises a hollow metal shell 5 with openings at two ends, a plurality of cylindrical current-collecting winding cores 6 arranged in the metal shell 5, and an upper cover plate assembly and a lower cover plate assembly which are respectively arranged at two ends of the metal shell 5 and seal the openings at two ends of the metal shell 5; the upper cover plate component comprises a negative cover plate 1, a negative insulation heat-conducting fin 2, a negative insulation support 4 and a negative bus bar 3 (comprising five forms 3a-3 e); the lower cover plate component comprises an anode cover plate 9, an anode insulating bracket 7 and an anode bus bar 8; the cylindrical current collecting winding core 6 comprises a metal tube 62, a cylindrical winding core (body) 61, a positive current collecting disc (sheet) 65, a negative current collecting cap 63 (divided into 63a and 63 b) and a negative guard ring 64; the cylindrical winding core (body) 61 is a multilayer winding structure formed by winding a positive plate, a diaphragm, a negative plate and the diaphragm in sequence; the positive plate empty foil area and the negative plate empty foil area are respectively positioned at two ends of the cylindrical roll core (body) 61; one side of the positive plate is a positive plate coating area coated with a positive material, and the other side of the positive plate is a blank positive plate foil area; one side of the negative plate is a negative plate coating area coated with a negative material, and the other end of the negative plate is a blank negative plate empty foil area; the positive plate empty foil area and the negative plate empty foil area are respectively positioned at two ends of the cylindrical winding core (body) 61, the positive plate empty foil area is shaped into a cross shape, and the empty foils in the cross-shaped area are welded with the positive current collecting disc 65; shaping the empty foil area of the negative plate into a rectangle, and welding empty foils on two sides of the rectangle with the negative current collecting cap 63; the positive current collecting plates 65 are welded with the positive current collecting plates 8, and the positive current collecting plates 8 are welded with the positive cover plate 9; the negative electrode current collecting caps 63a are welded with the negative electrode current collecting sheets 3a or 3e, and the negative electrode current collecting sheets 33a or 3e are connected with the negative electrode cover plate 1. In another mode, a plurality of negative electrode collecting caps 63b are welded with the negative electrode collecting pieces 3b or 3c or 3d, and the negative electrode collecting pieces 3b or 3c or 3d are connected with the negative electrode cover plate 1.
The invention designs a storage battery, which comprises a metal shell 5, a plurality of cylindrical current-collecting winding cores 6, an anode cover plate 9, a cathode cover plate 1, an anode bus sheet 8, a cathode bus sheet 3 (comprising five forms of 3a-3 e), an anode insulating support 7, a cathode insulating heat-conducting sheet 2 and a cathode insulating support 4; the empty foil area of the positive plate at the positive end of the cylindrical winding core (body) 61 is shaped into a cross shape and is welded with the positive current collecting disc 65 into a whole through laser welding; and the cylindrical winding core (body) 61 is put into the metal tube 62 with the positive electrode facing the bottom of the metal tube; the empty foil area of the negative electrode sheet at the negative end of the cylindrical winding core (body) 61 is shaped into a rectangle, a negative electrode retainer 64 is sleeved at the negative end of the cylindrical winding core (body) 61 and is supported and positioned by the upper edge of the metal tube 62; then, a negative current collecting cap 63 is put on the negative guard ring 64, so that the lower edge of the current collecting cap 63 is embedded into the guard ring groove for positioning; then the empty foil areas at the two sides of the rectangle are compressed and welded with the inner wall 631 of the negative current collecting cap 63 through ultrasonic welding; the welding surface 652 of the positive collecting sheet 8 and the positive collecting tray 65 of the cylindrical collecting core 6 and the annular bottom surface of the metal tube 62 are welded one by one; then, placing the anode insulating bracket 7 above the bus bar 8; then welding the positive pole confluence piece 8 and the positive pole cover plate 9; the negative current collecting sheets 3a or 3e are welded with the welding surface 632 of the negative current collecting cap 63 of the cylindrical current collecting winding core 6 one by one; in another mode, the negative current collecting sheets 3b, 3c or 3d are welded with the welding surface 633 of the negative current collecting cap 63 of the cylindrical current collecting winding core 6 one by one; then, a negative electrode insulating bracket 4 is placed above the bus bar 3; then connecting the negative pole confluence piece 3 with the negative pole cover plate 1; the positive terminal of the battery can also be manufactured by the same method as the negative terminal.
The positive current collecting plate, the positive current collecting sheet and the metal tube with the bottom are made of the same material; the negative current collecting cap and the negative current collecting plate are made of any one or two metal materials of copper, copper alloy, copper nickel plating, carbon steel, nickel and nickel alloy.
The cylindrical current collecting roll core in the storage battery is composed of positive and negative poles of the same system, such as any one of chemical power supplies of a lithium iron phosphate-graphite roll core, a lithium manganate-graphite roll core, a nickel cobalt lithium manganate-graphite roll core, a lithium cobaltate-lithium titanate roll core, a lithium manganate-lithium titanate roll core, a super capacitor roll core, a metal hydride-nickel roll core, a cadmium-nickel roll core, a zinc-nickel roll core and the like, and is not limited to the system.
Meanwhile, the cylindrical winding core in the storage battery can be combined by winding cores of different material systems, such as a lithium manganate-graphite winding core and a nickel cobalt lithium manganate-graphite winding core, a power type super capacitor winding core and an energy type lithium ion winding core of the same type of positive electrode material, and the like. Two types of winding cores with different characteristics are combined in parallel to form a high-capacity battery, so that the performance is improved, and the cost is reduced.
It should be noted that, different battery systems are suitable for different types of metals, which belongs to the known technology in the industry, for example, lithium ion batteries adopt aluminum as the material of the metal housing and the metal tube, and the anode matrix of the cylindrical winding core is aluminum foil, and the cathode matrix is copper foil; for example, super capacitors and batteries using lithium titanate as a negative electrode material adopt aluminum as a material of a metal shell and a metal tube, and the positive electrode and the negative electrode substrates of a cylindrical roll core are both aluminum foils; stainless steel or other materials can also be used as the material of the metal shell and the metal tube.
The large-capacity battery designed by the invention comprises an upper cover plate 1, a negative electrode insulating heat-conducting fin 2, a negative electrode bus bar 3 (comprising five forms 3a-3 e), a negative electrode insulating frame 4, a metal shell 5, a cylindrical current-collecting winding core 6, a positive electrode insulating frame 7, a positive electrode bus bar 8 and a lower cover plate 9, as shown in an exploded diagram of fig. 1. As shown in the perspective view of the invention in FIG. 2, a negative pole column 11, a liquid injection hole 12, a positive pole column 13 and an explosion-proof valve 14 are distributed on an upper cover plate 1. As shown in the exploded views of the cylindrical current collecting winding core of the present invention in fig. 6a-6b, the cylindrical current collecting winding core comprises a two-end shaping winding core (body) 61, an aluminum tube 62, a negative current collecting cap 63a or 63b, a retainer 64, and a positive current collecting disc 65.
Winding a winding core with copper and aluminum foil at two ends, shaping the positive and negative ends of the winding core into a positive cross-shaped groove and a negative middle rectangular groove according to the figure 10 and the figures 11a-11 b.
The roll cores with shaped ends, the retainer 64 and the current collecting cap 63 are placed in the negative electrode, and the foil material at the negative electrode end and the current collecting cap position 631 shown in figures 8a-8b are subjected to ultrasonic welding. The positive cross slot is placed into the positive current collecting tray 65 and laser welded to the positive end foil and current collecting plate position 651 or 652 shown in fig. 9. An aluminum tube 62 is placed, and the bottom edge of the aluminum tube 62 is laser welded with the edge of the positive current collecting plate 65.
In fig. 3, a positive insulating frame 7 and a negative insulating frame 4 are respectively arranged at two ends of a cylindrical current collecting winding core 6.
Fig. 4a-4e illustrate the welding of the negative bus bar of the battery of the present invention by laser welding the negative bus bar welding site 31 to the negative current collecting cap welding site 632.
Fig. 12a-12e show 5 types of bus bar structures, and the other welding between the header cap 63 and the bus bars 3b, 3c, 3d is ultrasonic welding with a circular arc shape, and the bus bars corresponding to 32, 33, 34 shown in fig. 4a-4e are welded to the point 633 shown in fig. 8a-8 b.
Fig. 5 is a schematic diagram illustrating welding of the positive electrode tab of the secondary battery according to the present invention, wherein the positive electrode tab welding site 81 is laser-welded to the positive electrode current collecting plate welding site 652.
And (3) installing the metal shell 5, and welding the lower cover plate 9 and the positive bus bar sheet 8, such as a positive bus bar sheet welding position 82 in the figure 5.
And putting the heat-conducting insulating plate 2, and sealing and laser welding the upper cover plate 1 and the lower cover plate 9 with the metal shell 5 respectively.
The processing method of the high-capacity battery comprises the following steps:
(1) arranging a positive electrode material layer on one side of a positive electrode plate of the positive electrode plate to form a positive electrode plate coating area, and leaving a blank on the other side to form a positive electrode plate blank area;
(2) arranging a negative electrode material layer on one side of a negative electrode plate of the negative electrode plate to form a negative electrode plate coating area, and leaving a blank on the other side to form a negative electrode plate blank area;
(3) winding the positive plate, the negative plate and the diaphragm according to the order of the positive plate, the diaphragm, the negative plate and the diaphragm to form a cylindrical winding core, and respectively reserving a positive plate empty foil area and a negative plate empty foil area at two ends of the cylindrical winding core;
(4) shaping the empty foil area of the positive plate at the positive end of the cylindrical winding core into a cross shape, and welding the empty foil area of the positive plate and the positive current collecting plate into a whole through laser welding; putting the cylindrical winding core into the metal tube in a direction that the anode faces the bottom of the metal tube;
(5) shaping the empty foil area of the negative plate at the negative end of the cylindrical winding core into a designed shape, sleeving a negative guard ring at the negative end of the cylindrical winding core, and supporting and positioning by the upper edge of the metal tube; then a negative current collecting cap is put on the negative guard ring, so that the lower edge of the current collecting cap is embedded into the guard ring groove for positioning; then the hollow foil area with the designed shape is compressed and welded with the inner wall of the negative current collecting cap through ultrasonic welding, and the welding shape is arc; thus forming a cylindrical current collecting winding core;
(6) welding the positive current collecting sheet with the welding surface of the positive current collecting disc of the cylindrical current collecting winding core and the annular bottom surface of the metal pipe one by one; welding the negative current collecting sheet and the welding surface of the negative current collecting cap of the cylindrical current collecting winding core one by one; forming a cylindrical winding core group;
(7) assembling the welded cylindrical winding core into a metal shell;
(8) then placing an anode insulating support above the anode bus bar; welding the positive pole confluence piece with the positive pole cover plate;
(9) the metal shell and the anode cover plate are welded in a sealing way;
(10) placing a negative electrode insulating support above the negative electrode bus bar; then connecting the negative pole afflux sheet with the negative pole cover plate;
(11) welding the negative cover plate and the metal shell in a sealing way;
(12) baking the battery, injecting electrolyte, forming and sealing.
Example 1:
according to the method for manufacturing the battery, 10 lithium iron phosphate 5Ah positive electrode-graphite negative electrode winding cores (with the diameter of 26mm and the height of 73mm) are manufactured into a 3.2V50Ah battery by the processing method. The battery is 2I at 25 DEG C1When the current is continuously discharged, the temperature difference between the center of the battery and the outer surface is less than or equal to 3 ℃; the maximum temperature rises of the positive pole column, the negative pole column and the outer surface of the battery are respectively 10 ℃, 9 ℃ or 8 ℃; the battery is placed for 28 days at 25 ℃, and the charge is kept over 97.5 percent; the battery is not ignited, not exploded and not burnt when being pricked.
Example 2:
in the lithium battery capable of outputting large current, 5 6Ah lithium nickel cobalt manganese oxide positive electrode-graphite negative electrode winding cores (with the diameter of 26mm and the height of 66mm) are manufactured into a 3.6V30Ah battery by the processing method. The battery is 2I at 25 DEG C1When the current is continuously discharged, the temperature difference between the center of the battery and the outer surface is less than or equal to 3 ℃; the maximum temperature rises of the positive pole column, the negative pole column and the outer surface of the battery are respectively 9 ℃, 8 ℃ or 7 ℃; the electric battery is placed for 28 days at the temperature of 25 ℃, and the charge is kept above 96.5%; the battery puncture test did not catch fire, explode, and burn.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (12)
1. The storage battery is characterized by comprising a hollow metal shell with openings at two ends, a plurality of cylindrical current collecting winding cores arranged in the metal shell, and an upper cover plate assembly and a lower cover plate assembly which are respectively arranged at two ends of the metal shell and seal the openings at two ends of the metal shell; the upper cover plate assembly comprises a negative cover plate, a negative insulation heat-conducting fin, a negative insulation support and a negative bus bar; the lower cover plate assembly comprises a positive cover plate, a positive insulating support and a positive bus bar; the cylindrical current-collecting winding core comprises a metal tube, a cylindrical winding core body, a positive current-collecting disc, a negative current-collecting cap and a negative guard ring; the cylindrical winding core body is of a multilayer winding structure formed by winding a diaphragm, a positive plate, a diaphragm, a negative plate and a diaphragm in sequence; the positive plate empty foil area and the negative plate empty foil area are respectively positioned at two ends of the cylindrical roll core body; one side of the positive plate is a positive plate coating area coated with a positive material, and the other side of the positive plate is a blank positive plate foil area; one side of the negative plate is a negative plate coating area coated with a negative material, and the other end of the negative plate is a blank negative plate empty foil area; the empty foil area of the positive plate is in a shape of a cross, and the empty foil in the cross area is connected with the positive current collecting plate in a welding mode; the negative plate hollow foil area is in a shaped design shape, and the hollow foil on the edge of the design shape is connected with the negative current collecting cap in a welding mode; the positive current collecting plates are connected with the positive cover plate in a welding manner; the negative pole current collecting caps are connected with the negative pole current collecting pieces in a welding mode, and the negative pole current collecting pieces are connected with the negative pole cover plate.
2. The battery of claim 1, wherein the positive plate foil-free area at the positive end of the cylindrical rolled core body is welded with the positive current collecting plate by laser welding and is arranged in the metal tube with the positive electrode facing the bottom of the metal tube.
3. The accumulator according to claim 1, characterized in that the design shape of the shaping of the negative plate empty foil region can be rectangular, circular and is not limited to these types; the remaining edge empty foil area after the shaping of the negative electrode end of the winding core is a plurality of arc areas or a circle.
4. The battery of claim 1, wherein the negative retainer is fitted over the negative end of the cylindrical wound core and is held in place by the upper edge of the metal tube; a negative electrode current collecting cap is arranged on the negative electrode retainer, so that the lower edge of the current collecting cap is embedded into the retainer groove for positioning; and the hollow foil areas at the edges of the designed shape are pressed together and welded with the inner wall of the negative current collecting cap in an ultrasonic welding mode, and the welding shape is arc.
5. The accumulator according to claim 1 or 2, characterized in that the positive collector plate is welded with the welding surface of the positive collector plate of the cylindrical collector core and the annular bottom surface of the metal tube one by one; placing a positive electrode insulating support on the upper part or the lower part of the bus bar; the positive pole afflux sheet and the positive pole cover plate are connected together in a welding mode.
6. The accumulator according to claim 1, 3 or 4, characterized in that the negative collector plate is welded with the welding surface of the negative collector cap of the cylindrical collector core in a one-by-one manner; a negative electrode insulating bracket is arranged above the bus bar; the negative pole afflux sheet is connected with the negative pole cover plate.
7. The accumulator according to claim 1, 3 or 4, characterized in that the negative collecting cap welding surface can be the upper surface of the collecting cap or the arc side surface.
8. The battery of claim 1, wherein said positive current collector plate and said positive current collector plate, said metal tube with bottom are made of the same material; the negative current collecting cap and the negative current collecting plate are made of any one or two metal materials of copper, copper alloy, copper nickel plating, carbon steel, nickel and nickel alloy.
9. A method for manufacturing a storage battery, which is used for manufacturing the storage battery of any one of the claims 1-8, and is characterized by comprising the following steps:
(1) arranging a positive electrode material layer on one side of the positive electrode plate to form a positive electrode plate coating area, and leaving a blank on the other side to form a positive electrode plate blank area;
(2) arranging a negative electrode material layer on one side of the negative electrode plate to form a negative electrode plate coating area, and leaving a blank on the other side to form a negative electrode plate blank area;
(3) winding the positive plate, the negative plate and the diaphragm according to the order of the positive plate, the diaphragm, the negative plate and the diaphragm to form a cylindrical winding core, and respectively reserving a positive plate empty foil area and a negative plate empty foil area at two ends of the cylindrical winding core;
(4) shaping the empty foil area of the positive plate at the positive end of the cylindrical winding core into a cross shape, and welding the empty foil area of the positive plate and the positive current collecting plate into a whole through laser welding; putting the cylindrical winding core into the metal tube in a direction that the anode faces the bottom of the metal tube;
(5) shaping the empty foil area of the negative plate at the negative end of the cylindrical winding core into a designed shape, sleeving a negative guard ring at the negative end of the cylindrical winding core, and supporting and positioning by the upper edge of the metal tube; then a negative current collecting cap is put on the negative guard ring, so that the lower edge of the current collecting cap is embedded into the guard ring groove for positioning; then compressing the hollow foil area at the edge of the designed shape, and welding the hollow foil area and the inner wall of the negative current collecting cap together through ultrasonic welding; thus forming a cylindrical current collecting core.
10. The method for manufacturing a secondary battery according to claim 9, further comprising the steps of:
(6) welding the positive current collecting sheet with the welding surface of the positive current collecting disc of the cylindrical current collecting winding core and the annular bottom surface of the metal pipe one by one; welding the negative current collecting sheet and the welding surface of the negative current collecting cap of the cylindrical current collecting winding core one by one; forming a cylindrical winding core group;
(7) assembling the welded cylindrical winding core into a metal shell;
(8) then placing a positive electrode insulating bracket above or below the positive electrode bus bar; welding the positive pole confluence piece with the positive pole cover plate;
(9) and (4) sealing and welding the metal shell and the positive cover plate.
11. The method for manufacturing a secondary battery according to claim 10, further comprising the steps of:
(10) a negative electrode insulating bracket and an insulating heat conducting fin are arranged above the negative electrode bus bar; then connecting the negative pole afflux sheet with the negative pole cover plate;
(11) welding the negative cover plate and the metal shell in a sealing way;
(12) baking the battery, injecting electrolyte, forming and sealing.
12. The method of claim 7, wherein the positive terminal of the battery is fabricated by the same method as the negative terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064410.4A CN112054236A (en) | 2020-09-30 | 2020-09-30 | Storage battery and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011064410.4A CN112054236A (en) | 2020-09-30 | 2020-09-30 | Storage battery and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN112054236A true CN112054236A (en) | 2020-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011064410.4A Withdrawn CN112054236A (en) | 2020-09-30 | 2020-09-30 | Storage battery and manufacturing method thereof |
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| CN (1) | CN112054236A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611905A (en) * | 2021-07-30 | 2021-11-05 | 湖北亿纬动力有限公司 | Preparation method of battery and battery |
| CN113809335A (en) * | 2021-08-24 | 2021-12-17 | 贵阳比耐新能源科技有限公司 | Cylindrical steel shell battery and manufacturing method thereof |
| CN114784464A (en) * | 2022-03-18 | 2022-07-22 | 多氟多新能源科技有限公司 | Battery cell and battery module |
| WO2023178483A1 (en) * | 2022-03-21 | 2023-09-28 | 宁德时代新能源科技股份有限公司 | Battery cell, manufacturing method and manufacturing equipment therefor, battery, and power consuming apparatus |
-
2020
- 2020-09-30 CN CN202011064410.4A patent/CN112054236A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113611905A (en) * | 2021-07-30 | 2021-11-05 | 湖北亿纬动力有限公司 | Preparation method of battery and battery |
| CN113809335A (en) * | 2021-08-24 | 2021-12-17 | 贵阳比耐新能源科技有限公司 | Cylindrical steel shell battery and manufacturing method thereof |
| CN114784464A (en) * | 2022-03-18 | 2022-07-22 | 多氟多新能源科技有限公司 | Battery cell and battery module |
| WO2023178483A1 (en) * | 2022-03-21 | 2023-09-28 | 宁德时代新能源科技股份有限公司 | Battery cell, manufacturing method and manufacturing equipment therefor, battery, and power consuming apparatus |
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Application publication date: 20201208 |