CN111180782B - Method for manufacturing secondary battery by adopting double-core-cladding lamination and integral riveting - Google Patents
Method for manufacturing secondary battery by adopting double-core-cladding lamination and integral riveting Download PDFInfo
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- CN111180782B CN111180782B CN201911421765.1A CN201911421765A CN111180782B CN 111180782 B CN111180782 B CN 111180782B CN 201911421765 A CN201911421765 A CN 201911421765A CN 111180782 B CN111180782 B CN 111180782B
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000003475 lamination Methods 0.000 title claims abstract description 19
- 238000005253 cladding Methods 0.000 title claims abstract description 12
- 239000011888 foil Substances 0.000 claims abstract description 113
- 238000007789 sealing Methods 0.000 claims abstract description 26
- 238000003466 welding Methods 0.000 claims abstract description 22
- 238000010030 laminating Methods 0.000 claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims abstract description 4
- 239000010959 steel Substances 0.000 claims abstract description 4
- 238000004080 punching Methods 0.000 claims description 27
- 238000005520 cutting process Methods 0.000 claims description 24
- 229920001973 fluoroelastomer Polymers 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 12
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 10
- 229910052731 fluorine Inorganic materials 0.000 claims description 10
- 239000011737 fluorine Substances 0.000 claims description 10
- 229910000838 Al alloy Inorganic materials 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 229920001971 elastomer Polymers 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 8
- 125000006850 spacer group Chemical group 0.000 claims description 8
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000011267 electrode slurry Substances 0.000 claims description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 claims description 3
- 102000004310 Ion Channels Human genes 0.000 claims description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 239000004793 Polystyrene Substances 0.000 claims description 3
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims description 3
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 3
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 229910001415 sodium ion Inorganic materials 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000002347 injection Methods 0.000 claims 1
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- 239000007788 liquid Substances 0.000 claims 1
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- 230000017525 heat dissipation Effects 0.000 description 1
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Classifications
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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
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
- H01M10/0418—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes with bipolar electrodes
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a method for manufacturing a secondary battery by adopting a double-core cladding lamination and integral riveting, which comprises the following steps: firstly, manufacturing a negative plate (1) and a positive plate (30); secondly, laminating the positive plate (30) and the negative plate (1) to obtain a double-core package; thirdly, performing an integral riveting mode on the laminated double-core bag (9); and fourthly, respectively taking contact lines on two sides of the positive lug riveting gasket (17) and the positive lug empty foil area (5) and contact lines on two sides of the negative lug riveting gasket (22) and the negative lug empty foil area (2) as axes, respectively bending the positive lug empty foil area (5) and the negative lug empty foil area (2) to fold the two cores towards the lower end of the cover plate, respectively placing two unilateral brackets (23) between the top cover and the diaphragm (8) of the double-core bag (9) from two lateral surfaces, forming the secondary battery (24) through laser welding, and finally injecting, forming, knocking steel balls or sealing nails into the secondary battery according to the process requirements.
Description
Technical Field
The invention relates to a method for manufacturing a secondary battery by adopting a double-core cladding lamination and integral riveting.
Background
The mainstream secondary batteries in the market at present can be roughly classified into: a square lamination core pack, a square winding core pack, and a cylindrical winding core pack. For cells of the same capacity, a generally cylindrical wound core package is made most efficient, followed by square winding, where the square laminated core package is least efficient. But the square laminate core package has significant performance advantages over other forms of manufacture: the parallel connection of the multiple pole pieces ensures that the internal resistance is lower, the leveling of the pole pieces ensures that the consistency of the positive pole and the negative pole is good, the space utilization rate is high, the volume energy density is higher, the heat dissipation is better, and the like. Due to its many advantages, prismatic laminated batteries have no alternative position, especially in the field of power batteries and energy storage batteries. On the other hand, the pole piece and pole of the general square laminated battery are connected in a mode of transition of a patch: one end of the adapter plate is connected with a pole lug of the pole piece in an ultrasonic welding mode, and the other end of the adapter plate and the pole are welded or riveted into a whole through laser; or the pole ear is riveted on the adapter plate, and the adapter plate and the pole are riveted on the cover plate. The transition mode is complex in process, and the internal resistance is possibly increased due to two times of contact.
Disclosure of Invention
The invention provides a method for manufacturing a secondary battery by adopting double-core cladding lamination and integral riveting, which improves the core cladding lamination efficiency and has simple manufacture and low internal resistance.
The invention adopts the following technical scheme: a method for manufacturing a secondary battery by adopting a double-core cladding lamination and integral riveting comprises the following steps: coating negative electrode slurry on two sides of a corresponding negative electrode metal foil, and drying, rolling, punching or die-cutting to form a negative electrode sheet, wherein the middle part of the negative electrode sheet is a negative electrode tab empty foil area, two sides of the negative electrode tab empty foil area are negative electrode sheet dressing areas, a negative electrode tab through hole is formed in the negative electrode tab empty foil area, coating positive electrode slurry on two sides of a corresponding positive electrode metal foil, and drying, rolling, punching or die-cutting to form a positive electrode sheet, the middle part of the positive electrode sheet is a positive electrode tab empty foil area, two sides of the positive electrode tab empty foil area are positive electrode sheet dressing areas, and a positive electrode tab through hole is formed in the positive electrode tab empty foil area;
step two, preparing a double-core package after laminating the positive plate and the negative plate, wherein the specific mode is as follows: placing two rolls of diaphragms with the same width in parallel, aligning the starting ends of the two rolls of diaphragms, synchronously laminating, placing the negative pole pieces on the diaphragms, respectively positioning the dressing areas of the two negative pole pieces at the central positions of the two diaphragms, and synchronously covering the two rolls of diaphragms on the dressing areas of the two negative pole pieces from one side to the other side; then placing the positive plates on the diaphragms, enabling the two positive plate dressing areas to be respectively positioned at the center positions of the two diaphragms, synchronously covering the two coils of diaphragms on the two positive plate dressing areas from one side to the other side, circulating in such a way, and laminating the negative plates, the diaphragms, the positive plates and the diaphragms in sequence to prepare a double-core package, wherein the two coils of diaphragms are synchronously walked and have side faces in a shape of Chinese character 'ji' in the laminating process; all the negative electrode tab through holes and all the positive electrode tab through holes are respectively positioned at the same center, and finally, the double-core bag is used for laminating after the negative electrode plate is arranged on the upper part and the diaphragm is coated on the outer part;
step three, carrying out an integral riveting mode on the laminated rear double-core bag, wherein the concrete mode is as follows: firstly, respectively carrying out ultrasonic welding on a positive tab empty foil area and a negative tab empty foil area of a double-core pack, respectively forming a welding mark I on two sides of a positive tab through hole and a welding mark II on two sides of a negative tab through hole, wherein a rivet part I on the upper part of a positive post of the electric core sequentially penetrates through a fluorine rubber sealing ring I, a cover plate which is horizontally arranged in the reverse direction, a lower insulating gasket I corresponding to the positive post, a positive tab through hole and a positive tab riveting gasket on the positive tab empty foil area on the double-core pack from bottom to top and are fixedly aligned and then arranged on a riveting machine, the rivet part I on the upper part of the positive post and the double-core pack are riveted and compacted from top to bottom to form a whole body through the riveting machine, the rivet part II on the upper part of a negative post of the electric core sequentially penetrates through the fluorine rubber sealing ring II, the cover plate which is horizontally arranged in the reverse direction, the lower insulating gasket II corresponding to the negative post, the negative tab through hole and the negative tab riveting gasket on the negative tab empty foil area on the double-core pack and are fixedly aligned and then arranged on the riveting machine, and the rivet part II on the upper part of the negative post and the double-core pack are fixedly riveted to form a whole body from top through the riveting machine;
and step four, respectively taking contact lines on two sides of the positive tab riveting gasket and the positive tab empty foil area and contact lines on two sides of the negative tab riveting gasket and the negative tab empty foil area as axes, respectively bending the positive tab empty foil area and the negative tab empty foil area to fold the two core packages towards the lower end of the cover plate, respectively placing the two single-side brackets between the top cover and the diaphragm of the double-core package from two side surfaces to protect the positive tab empty foil area, the negative tab empty foil area and the double-core package, then wrapping a core package protective film outside the double-core package, then integrally placing the double-core package in an aluminum shell, forming the secondary battery through laser welding, and finally injecting, forming, and punching steel balls or sealing nails on the secondary battery according to the process requirements.
In the second step, the width of the diaphragm is larger than the heights of the dressing area of the negative plate on the single side and the dressing area of the positive plate, the diaphragm is respectively applied to the dressing area of the positive plate on two sides of the empty foil area of the positive tab and the dressing area of the negative plate on two sides of the empty foil area of the negative tab, the diaphragm is used as an electronic insulating layer and an ion channel between the positive plate and the negative plate, and the empty foil area of the positive tab is formed by punching or die cutting the positive plate and removing a part of blank foil; the negative pole tab empty foil area is formed by punching or die cutting the negative pole piece and removing a part of blank foil material, the symmetric central lines of the positive pole piece and the negative pole piece are overlapped, the positive pole piece is regarded as that the positive pole tab empty foil area and the negative pole tab empty foil area of the negative pole piece are mutually staggered and not overlapped, a positive pole tab through hole arranged on the positive pole tab empty foil area is used for subsequent riveting, the positive pole tab through hole is formed in the pole roll or pole piece punching or die cutting process or formed in the double-core package forming process or formed after the pole tab ultrasonic welding, a negative pole tab through hole arranged on the negative pole tab empty foil area is used for subsequent riveting, and the negative pole tab through hole is formed in the pole roll or pole piece punching or die cutting process or formed in the double-core package forming process or formed after the double-core package forming process and the pole tab ultrasonic welding process.
The negative metal foil is a copper material, the negative plate is a dumbbell-shaped single plate, the middle negative ear empty foil area is a bell rod, and the negative plate dressing areas on the two sides are bell hammers; the positive metal foil is made of aluminum alloy material, the positive plate is a dumbbell-shaped single plate, the hollow foil area of the middle positive lug is a bell rod, and the dressing areas of the positive plates on the two sides are bell hammers.
The double-core package is formed by circularly superposing a negative plate, a diaphragm, a positive plate and a diaphragm at the positive plate dressing areas on the two sides of the positive tab empty foil area and the negative plate dressing areas on the two sides of the negative tab empty foil area at the same time, and finally forming two core packages respectively connected with the positive tab empty foil area and the negative tab empty foil area.
The double-core wrapping and laminating mode is as follows: the positive coil coated in a clearance mode or coated in a continuous mode sequentially undergoes the procedures of drying, rolling, slitting die cutting or punching and the like to finally form a dumbbell-shaped positive plate, the negative coil coated in a clearance mode or coated in a continuous mode sequentially undergoes the procedures of drying, rolling, slitting die cutting or punching and the like to finally form a dumbbell-shaped negative plate, the two coils of diaphragms are located in the positions, parallel to the bell rods of the dumbbell-shaped positive plate and the dumbbell rods of the dumbbell-shaped negative plate, the negative plates are placed on the corresponding positions of the two coils of diaphragms, the two coils of diaphragms are laid on the negative plates in a space walking mode, then the positive plates are placed on the corresponding positions, the diaphragms are laid on the diaphragms, and the diaphragms are placed in a circulating mode, and finally the negative plates are stopped, and the two diaphragms wrap half circle or one circle of core packages formed by the laminated plates respectively to form a whole.
The positive post be the aluminum alloy positive post, the positive post includes rivet part I and lower part boss I on upper portion, wherein rivet part I on upper portion is the cylinder shape, the negative pole post is the copper pole post, the negative pole post includes rivet part II and lower part boss II on upper portion, wherein rivet part II on upper portion is the cylinder shape. The surface both sides of apron be equipped with anodal post through-hole and negative pole post through-hole respectively, fluororubber sealing washer I and fluororubber sealing washer II's material be fluororubber, the position of fluororubber sealing washer I is between the lower part boss I of anodal post and apron and in the anodal post through-hole on the apron, the position of fluororubber sealing washer II is between the lower part boss II of negative pole post and apron and in the negative pole post through-hole on the apron, the effect of fluororubber sealing washer I and fluororubber sealing washer II is that the guarantee apron is insulating with utmost point post and guarantee utmost point post is sealed around, prevent that electrolyte from leaking.
The lower insulating spacer I and the lower insulating spacer II are made of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride or acrylonitrile/butadiene/styrene copolymer.
The material of anodal ear riveting pad be the aluminum alloy material, the material of negative pole ear riveting pad is the copper product material, anodal ear riveting pad and negative pole ear riveting pad thickness are 1 to 3mm, the rivet part I on anodal post upper portion protrudes in anodal ear riveting pad after the assembly, rivet part II on negative pole post upper portion all protrudes in negative pole ear riveting pad. The secondary battery is a lithium battery, a lithium ion battery, a magnesium ion battery, an aluminum ion battery, a sodium ion battery, a lithium sulfur battery, a quasi-solid battery or an all-solid battery.
The invention has the following beneficial effects: the invention adopts a double-core wrapping and laminating mode, thereby improving the production efficiency; the integrated riveting mode is adopted, the connection of the pole and the pole lug through the adapter plate is avoided, the manufacturing process is simplified, and the internal resistance of the battery is reduced; the invention has simple assembly, good stability and good production benefit in the production process.
Drawings
Fig. 1 is a schematic view of a negative electrode sheet used in the present invention.
Fig. 2 is a schematic view illustrating an initial state of the dual core pack in the lamination process according to the present invention.
Fig. 3 is a schematic view of a dual core package during lamination according to the present invention.
Fig. 4 is a schematic view of ultrasonic welding of the double-core wrapped pole lug of the invention.
Fig. 5 is a schematic view of the positive post used in the present invention.
Fig. 6 is a riveting schematic diagram of the dual core package and the cover plate.
Fig. 7 is an exploded view of the dual core package and the cover plate after being riveted together.
Fig. 8 is a schematic diagram of a battery cell according to the present invention.
FIG. 9 is a side stand of the present invention.
Fig. 10 is a schematic view of the assembly of the battery cell and the side stand according to the present invention;
fig. 11 is an overall schematic view of a battery manufactured according to the present invention.
Detailed Description
In fig. 11, the present invention provides a method of manufacturing a secondary battery using a dual core pack laminate and integral riveting, comprising the steps of:
in the first step, in fig. 1, 2 and 3, coating a negative electrode slurry on two sides of a corresponding negative electrode metal foil, and drying, rolling, punching or die-cutting to form a negative electrode sheet 1, wherein the middle part of the negative electrode sheet 1 is a negative electrode tab empty foil area 2, two sides of the negative electrode tab empty foil area 2 are negative electrode sheet dressing areas 3, the negative electrode tab empty foil area 2 is provided with a negative electrode tab through hole 4, coating a positive electrode slurry on two sides of a corresponding positive electrode metal foil, and drying, rolling, punching or die-cutting to form a positive electrode sheet 30, the middle part of the positive electrode sheet 30 is a positive electrode tab empty foil area 5, two sides of the positive electrode tab empty foil area 5 are positive electrode sheet dressing areas 6, the positive electrode tab empty foil area 6 is provided with a positive electrode tab through hole 7, the negative electrode metal foil is a copper material, the negative electrode sheet 1 is a dumbbell-shaped single-piece, the middle negative electrode tab empty foil area 2 is a bell-shaped, and the negative electrode sheet dressing areas 3 on two sides are bell-hammers; the positive metal foil is made of an aluminum alloy material, the positive plate 30 is a dumbbell-shaped single-piece pole piece, the middle positive ear hollow foil area 5 is a bell rod, and the two side positive plate dressing areas 6 are bell hammers;
step two, laminating the positive plate 30 and the negative plate 1 to obtain a double-core package, wherein the specific mode is as follows: placing two rolls of diaphragms 8 with the same width in parallel, aligning the starting ends of the two rolls of diaphragms 8, synchronously laminating, placing the negative pole pieces 1 on the diaphragms 8, respectively positioning the two negative pole piece dressing areas 3 at the central positions of the two diaphragms 8, and synchronously covering the two rolls of diaphragms 8 on the two negative pole piece dressing areas 3 from one side to the other side; then the positive plate 30 is placed on the diaphragm 8, the two positive plate dressing areas 6 are respectively positioned at the central positions of the two diaphragms 8, the two coils of diaphragms 8 are synchronously covered on the two positive plate dressing areas 6 from one side to the other side, the process is circulated, the negative plate 1, the diaphragm 8, the positive plate 30 and the diaphragms 8 are laminated in sequence to prepare the double-core package 9, and the two coils of diaphragms 8 are synchronously taken and have side surfaces in a shape of Chinese character 'ji'; all the negative electrode tab through holes 4 and all the positive electrode tab through holes 7 are respectively positioned at the concentric positions, and finally the lamination process is finished by covering the negative electrode plate 1 on the positive electrode tab through holes and then covering the diaphragm by the double-core bag 9, wherein the double-core bag 9 is formed by circularly overlapping the negative electrode plate 1, the diaphragm 8, the positive electrode plate 30 and the diaphragm 8 in the positive electrode tab dressing area 6 at two sides of the positive electrode tab empty foil area 5 and the negative electrode plate dressing area 3 at two sides of the negative electrode tab empty foil area 2, and finally forming two core packages respectively connected with the positive electrode tab empty foil area 5 and the negative electrode tab empty foil area 2;
step three, in fig. 4, 5, 6, 7 and 8, the laminated dual core package 9 is riveted integrally in the following specific manner: firstly, respectively carrying out ultrasonic welding on a positive tab empty foil area 5 and a negative tab empty foil area 2 of a double-core bag 9, respectively forming welding marks I10 on two sides of a positive tab through hole 7 and welding marks II 11 on two sides of a negative tab through hole 4, respectively, sequentially passing a rivet part I13 on the upper part of a positive post 12 of a cell 29 through a fluororubber sealing ring I14, a cover plate 15 which is horizontally placed in the reverse direction, a lower insulating gasket I16 corresponding to the positive post 12, the positive tab through hole 7 and a positive tab riveting gasket 17 on the positive tab empty foil area 5 on the double-core bag 9 from bottom to top, fixing the rivet part I13 on the upper part of the positive post 12 and the double-core bag 9 to be fixedly integrated after riveting and compacting from top to bottom through the riveting machine, a rivet part II 19 on the upper part of a negative pole post 18 of a battery core 29 sequentially penetrates through a fluorine rubber sealing ring II 20, a cover plate 15 which is horizontally placed in a reverse direction, a lower insulating spacer II 21 corresponding to the negative pole post 18, a negative pole lug through hole 4 and a negative pole lug riveting spacer 22 on a negative pole lug empty foil area 2 on a double-core pack 9 from bottom to top, is positioned on a riveting machine after being fixed in a relative position, the rivet part II 19 on the upper part of the negative pole post 18 and the double-core pack 9 are riveted and compacted from top to bottom through the riveting machine to form a whole, the positive pole post 12 is an aluminum alloy positive pole post, the positive pole post 12 comprises a rivet part I13 on the upper part and a lower boss I25, wherein the rivet part I13 on the upper part is in a cylindrical shape, the negative pole post 18 is a copper pole post, the negative pole post 18 comprises a rivet part II 19 on the upper part and a lower boss II 26, the rivet part II 19 on the upper part is in a cylindrical shape, the lower insulating spacer I16 and the lower insulating spacer II 21 are both made of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride or a copolymer of acrylonitrile/butadiene/styrene, the positive tab riveting gasket 17 is made of an aluminum alloy material, the negative tab riveting gasket 22 is made of a copper material, the thicknesses of the positive tab riveting gasket 17 and the negative tab riveting gasket 22 are 1-3 mm, a rivet part I13 at the upper part of the positive post 12 protrudes out of the positive tab riveting gasket 17 after assembly, and a rivet part II 19 at the upper part of the negative post 18 protrudes out of the negative tab riveting gasket 22;
step four, in fig. 9 and 10, taking contact lines on two sides of the positive tab riveting gasket 17 and the positive tab empty foil area 5 and contact lines on two sides of the negative tab riveting gasket 22 and the negative tab empty foil area 2 as axes, respectively bending the positive tab empty foil area 5 and the negative tab empty foil area 2 to fold the two cores towards the lower end of the cover plate, respectively placing two unilateral brackets 23 between the top cover and the diaphragm 8 of the dual-core pack 9 from two sides to protect the positive tab empty foil area 5, the negative tab empty foil area 2 and the dual-core pack 9, then wrapping a core cladding protective film outside the dual-core pack 9, then integrally placing the two cores into an aluminum shell, forming a secondary battery 24 through laser welding, and finally injecting, forming, steel ball punching or nail sealing the secondary battery according to the process requirements.
In the second step of this embodiment, the width of the separator 8 is greater than the heights of the one-side negative plate dressing region 3 and the positive plate dressing region 6, the separator 8 is respectively applied to the positive plate dressing region 6 on both sides of the positive tab empty foil region 5 and the negative plate dressing region 3 on both sides of the negative tab empty foil region 2, the separator 8 is used as an electronic insulating layer and an ion channel between the positive plate 30 and the negative plate 1, and the positive tab empty foil region 6 is formed by punching or die cutting the positive plate 30 and removing a part of the blank foil; the negative electrode tab empty foil area 2 is formed by punching or die cutting the negative electrode sheet 1 and removing a part of blank foil materials, the symmetric central lines of the positive electrode sheet 30 and the negative electrode sheet 1 are overlapped, the positive electrode sheet 30 is regarded as that the positive electrode tab empty foil area 6 and the negative electrode tab empty foil area 2 of the negative electrode sheet 1 are mutually staggered and do not overlap, a positive electrode tab through hole 7 arranged on the positive electrode tab empty foil area 6 is used for subsequent riveting, the positive electrode tab through hole 7 is formed in the process of pole roll or pole piece punching or die cutting or formed in the process of double-core bag 9 forming and pole tab ultrasonic welding, a negative electrode tab through hole 4 arranged on the negative electrode tab empty foil area 2 is used for subsequent riveting, and the negative electrode tab through hole 4 is formed in the process of pole roll or pole piece punching or die cutting or formed in the process of double-core bag 9 forming and pole tab ultrasonic welding. The dual core package lamination method adopted in this embodiment is as follows: the gap-coated or continuously-coated anode coil is sequentially subjected to the procedures of drying, rolling, strip-dividing die cutting or punching and the like to finally form a dumbbell-shaped anode sheet 30, the gap-coated or continuously-coated cathode coil is sequentially subjected to the procedures of drying, rolling, strip-dividing die cutting or punching and the like to finally form a dumbbell-shaped cathode sheet 1, two coils of diaphragms 8 are positioned in parallel with a bell rod of the dumbbell-shaped anode sheet 30 and a bell rod of the dumbbell-shaped cathode sheet 1 in space, the cathode sheet 1 is placed on the corresponding positions of the two coils of diaphragms 8, the two coils of diaphragms 8 are positioned on the cathode sheet 1 in a space walking way, then the anode sheet 30 is placed on the corresponding positions, the diaphragms 8 are further covered with a layer of electrolyte, the electrolyte is circularly placed in such a way, finally, the cathode sheet 1 is stopped, the two diaphragms 8 are respectively wrapped with half circles or a circle of core packages formed by the laminations to form a whole, two sides of the surface of the cover plate 15 are respectively provided with an anode post through hole 27 and a cathode post through hole 28, the cover plate 15 and a cathode post through hole 20 are provided with a fluorine-containing rubber sealing ring 14, the lower part of the fluorine sealing ring 14, the cover plate I and the fluorine-containing rubber sealing ring 14 are arranged between the cover plate I and the lower part of the fluorine-containing rubber sealing ring 14, and the fluorine-containing rubber sealing ring 14.
In fig. 11, the secondary battery 24 manufactured according to the present invention is a lithium battery, a lithium ion battery, a magnesium ion battery, an aluminum ion battery, a sodium ion battery, a lithium sulfur battery, a quasi-solid battery, or an all-solid battery.
Claims (10)
1. A method for manufacturing a secondary battery by adopting a double-core cladding lamination and integral riveting comprises the following steps:
coating negative electrode slurry on two sides of a corresponding negative electrode metal foil, and drying, rolling, punching or die-cutting to form a negative electrode sheet (1), wherein the middle part of the negative electrode sheet (1) is a negative electrode tab empty foil area (2), two sides of the negative electrode tab empty foil area (2) are negative electrode sheet dressing areas (3), a negative electrode tab through hole (4) is formed in the negative electrode tab empty foil area (2), coating the positive electrode slurry on two sides of the corresponding positive electrode metal foil, and drying, rolling, punching or die-cutting to form a positive electrode sheet (30), the middle part of the positive electrode sheet (30) is a positive electrode tab empty foil area (5), two sides of the positive electrode tab empty foil area (5) are positive electrode sheet dressing areas (6), and the positive electrode tab empty foil area (5) is provided with a positive electrode tab through hole (7);
step two, laminating the positive plate (30) and the negative plate (1) to obtain the double-core package, wherein the specific mode is as follows: placing two rolls of diaphragms (8) with the same width in parallel, aligning the starting ends of the two rolls of diaphragms (8), synchronously laminating, placing the negative pole pieces (1) on the diaphragms (8), respectively positioning the two negative pole piece dressing areas (3) at the central positions of the two diaphragms (8), and synchronously covering the two rolls of diaphragms (8) on the two negative pole piece dressing areas (3) from one side to the other side; then placing the positive plate (30) on the diaphragm (8), enabling the two positive plate dressing areas (6) to be respectively positioned at the central positions of the two diaphragms (8), synchronously covering the two coils of diaphragms (8) on the two positive plate dressing areas (6) from one side to the other side, circulating in such a way, and laminating the negative plate (1), the diaphragms (8), the positive plate (30) and the diaphragms (8) in sequence to obtain a double-core package (9), wherein the two coils of diaphragms (8) are synchronously taken and the side surfaces of the two coils of diaphragms (8) are Z-shaped in the laminating process; all the negative pole lug through holes (4) and all the positive pole lug through holes (7) are respectively positioned at the same center, and finally, the process of laminating by the double-core bag (9) is finished after the negative pole piece (1) is arranged on the negative pole piece and the diaphragm is coated outside;
step three, carrying out an integral riveting mode on the laminated double-core bag (9), wherein the concrete mode is as follows: firstly, respectively carrying out ultrasonic welding on a positive lug empty foil area (5) and a negative lug empty foil area (2) of a double-core bag (9), respectively forming welding marks I (10) on two sides of a positive lug through hole (7) and welding marks II (11) on two sides of a negative lug through hole (4), respectively, sequentially passing a fluorine rubber sealing ring I (14) through a rivet part I (13) on the upper part of a positive post (12) of a battery core (29) from bottom to top, reversely-placed cover plates (15), lower insulating gaskets I (16) corresponding to the positive post (12), fixedly aligning the positive lug through hole (7) and the positive lug riveting gasket (17) on the positive lug empty foil area (5) on the double-core bag (9), and then arranging the rivet part I (13) on the upper part of the positive post (12) and the double-core bag (9) on a riveting machine, fixedly aligning the rivet part I (13) on the upper part of the positive post (12) and the double-core bag (9) from top to bottom by the riveting machine, and then firmly integrating the rivet part I (19) on the negative lug through the fluorine rubber sealing ring (20) from bottom, horizontally-placed cover plates (15), and the negative lug empty foil area (18) on the negative post (18), and the negative lug empty foil area (2), and then arranging the double-core bag (18) on the negative post (18) on the double-core bag (18) on the riveting machine, and the negative post (18), and then aligning the double-pole bag (18), and then arranging the double-pole rivet part II), and finally arranging the double-pole rivet part II), and riveting machine (9) Riveting and compacting from top to bottom and then firmly integrating the components into a whole;
and fourthly, respectively taking contact lines on two sides of the positive lug riveting gasket (17) and the positive lug empty foil area (5) and contact lines on two sides of the negative lug riveting gasket (22) and the negative lug empty foil area (2) as axes, respectively bending the positive lug empty foil area (5) and the negative lug empty foil area (2) to fold the two cores towards the lower end of the cover plate, respectively placing two unilateral brackets (23) between the top cover and a diaphragm (8) of the double-core bag (9) from two sides to protect the positive lug empty foil area (5), the negative lug empty foil area (2) and the double-core bag (9), then wrapping a core package protective film outside the double-core bag (9), then integrally placing the double-core package protective film into an aluminum shell to form a secondary battery (24) through laser welding, and finally performing laser welding, formation, steel ball punching or liquid injection and nail sealing on the secondary battery according to the process requirements.
2. The method for manufacturing a secondary battery by adopting double-core cladding and integral riveting as claimed in claim 1, wherein in the second step, the width of the diaphragm (8) is larger than the height of the one-side negative plate dressing area (3) and the positive plate dressing area (6), the diaphragm (8) is respectively applied to the positive plate dressing area (6) on both sides of the positive tab empty foil area (5) and the negative plate dressing area (3) on both sides of the negative tab empty foil area (2), the diaphragm (8) is used as an electronic insulation layer and an ion channel between the positive plate (30) and the negative plate (1), and the positive tab empty foil area (5) is formed by punching or die cutting the positive plate (30) and removing a part of blank foil; the negative tab empty foil area (2) is formed by punching or die cutting the negative plate (1) and removing a part of blank foil, the symmetric central lines of the positive plate (30) and the negative plate (1) coincide after superposition, the positive plate (30) is regarded as that the positive tab empty foil area (5) and the negative tab empty foil area (2) of the negative plate (1) are mutually staggered and do not coincide, a positive tab through hole (7) arranged on the positive tab empty foil area (5) is used for subsequent riveting, the positive tab through hole (7) is formed in the process of pole roll or pole piece punching or die cutting or formed in a dual-core bag (9) and punched after ultrasonic welding of a tab, the negative tab through hole (4) arranged on the negative tab empty foil area (2) is used for subsequent riveting, and the negative tab through hole (4) is formed in the process of pole roll or pole piece punching or die cutting or formed in the dual-core bag (9) and punched after ultrasonic welding of the tab.
3. The method for manufacturing a secondary battery by adopting double-core cladding lamination and integral riveting as claimed in claim 1, wherein the negative metal foil is a copper material, the negative plate (1) is arranged as a dumbbell-shaped single-piece pole piece, the middle negative ear empty foil area (2) is a bell rod, and the negative plate dressing areas (3) on two sides are bell hammers; the positive metal foil is made of aluminum alloy material, the positive plate (30) is a dumbbell-shaped single plate, the middle positive ear hollow foil area (5) is a bell rod, and the positive plate dressing areas (6) on the two sides are bell hammers.
4. The method for manufacturing a secondary battery by adopting double-core bag lamination and integral riveting according to claim 1, wherein the double-core bag (9) is formed by circularly overlapping the negative electrode sheet (1), the diaphragm (8), the positive electrode sheet (30) and the diaphragm (8) at the positive electrode sheet dressing area (6) on two sides of the positive electrode tab empty foil area (5) and the negative electrode sheet dressing area (3) on two sides of the negative electrode tab empty foil area (2) at the same time, and finally forming two core bags respectively connected with the positive electrode tab empty foil area (5) and the negative electrode tab empty foil area (2).
5. The method of claim 3, wherein the dual core pack laminate is manufactured by the following method: the gap-coated or continuously-coated positive electrode roll is sequentially subjected to the procedures of drying, rolling, strip-dividing die cutting or punching and the like to finally form a dumbbell-shaped positive electrode sheet (30), the gap-coated or continuously-coated negative electrode roll is sequentially subjected to the procedures of drying, rolling, strip-dividing die cutting or punching and the like to finally form a dumbbell-shaped negative electrode sheet (1), the two rolls of diaphragms (8) are spatially positioned in parallel with a bell rod of the dumbbell-shaped positive electrode sheet (30) and a bell rod of the dumbbell-shaped negative electrode sheet (1), the negative electrode sheets (1) are placed on the corresponding positions of the two rolls of diaphragms (8), the two rolls of diaphragms (8) are spatially positioned on the negative electrode sheets (1) and are covered with a layer, then the positive electrode sheet (30) is placed on the corresponding positions, the diaphragms (8) are further covered with a layer, the above layers are placed in a circulating mode, and finally the negative electrode sheets (1) are stopped, and the two diaphragms (8) respectively wrap a half circle or a circle of core package formed by the laminations to form a whole.
6. The method for manufacturing a secondary battery by using double-core lamination and integral riveting according to claim 1, wherein the positive post (12) is an aluminum alloy positive post, the positive post (12) comprises an upper rivet part I (13) and a lower boss I (25), the upper rivet part I (13) is in a cylindrical shape, the negative post (18) is a copper post, the negative post (18) comprises an upper rivet part II (19) and a lower boss II (26), and the upper rivet part II (19) is in a cylindrical shape.
7. The method of claim 1 or 6, wherein two sides of the surface of the cover plate (15) are respectively provided with a positive pole through hole (27) and a negative pole through hole (28), the fluororubber sealing rings I (14) and II (20) are made of fluororubber, the fluororubber sealing rings I (14) are positioned between the lower boss I (25) of the positive pole (12) and the cover plate (15) and in the positive pole through hole (27) on the cover plate (15), the fluororubber sealing rings II (20) are positioned between the lower boss II (26) of the negative pole (18) and the cover plate (15) and in the negative pole through hole (28) on the cover plate (15), and the fluororubber sealing rings I (14) and II (20) have the functions of ensuring the insulation of the cover plate (15) and the pole and the sealing around the pole, thereby preventing electrolyte leakage.
8. The method of claim 1, wherein the lower insulating spacer i (16) and the lower insulating spacer ii (21) are made of polyethylene, polypropylene, polystyrene, polyethylene terephthalate, polyvinyl chloride, or acrylonitrile/butadiene/styrene copolymer.
9. The method for manufacturing the secondary battery by adopting the double-core-cladding lamination and the integral riveting as claimed in claim 1 or 6, wherein the positive tab riveting gasket (17) is made of an aluminum alloy material, the negative tab riveting gasket (22) is made of a copper material, the thicknesses of the positive tab riveting gasket (17) and the negative tab riveting gasket (22) are 1-3mm, a rivet part I (13) at the upper part of the positive post (12) protrudes out of the positive tab riveting gasket (17) after assembly, and a rivet part II (19) at the upper part of the negative post (18) protrudes out of the negative tab riveting gasket (22).
10. The method of claim 1, wherein the secondary battery (24) is a lithium battery, a lithium ion battery, a magnesium ion battery, an aluminum ion battery, a sodium ion battery, a lithium sulfur battery, a solid-state-like battery, or an all-solid-state battery.
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| CN111883853A (en) * | 2020-07-24 | 2020-11-03 | 合肥国轩高科动力能源有限公司 | Parallelly connected assembled many rolls up core lithium cell |
| CN111740170B (en) * | 2020-08-18 | 2020-11-17 | 浙江艾罗网络能源技术有限公司 | Cable structure all-solid-state lithium sulfur battery and preparation method thereof |
| CN112038705A (en) * | 2020-09-29 | 2020-12-04 | 合肥国轩高科动力能源有限公司 | Battery roll core forming method, battery roll core structure and pole piece structure |
| CN114614102A (en) * | 2022-03-21 | 2022-06-10 | 合肥国轩高科动力能源有限公司 | Preparation method and application of composite current collector battery cell |
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| CN1655389A (en) * | 2005-03-04 | 2005-08-17 | 北京中信国安盟固利新材料技术研究院有限公司 | High capacity lithium ion secondary battery with metal case |
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| CN202050025U (en) * | 2011-01-10 | 2011-11-23 | 惠州市德赛聚能电池有限公司 | Laminated lithium battery |
| CN205542998U (en) * | 2015-12-21 | 2016-08-31 | 江西迪比科股份有限公司 | High power wet process cellulose non -woven fabrics diaphragm paper structure aluminum hull lithium ion secondary cell |
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