CN110465766A - A kind of lithium battery group parallel connection welder - Google Patents

A kind of lithium battery group parallel connection welder Download PDF

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Publication number
CN110465766A
CN110465766A CN201910776096.3A CN201910776096A CN110465766A CN 110465766 A CN110465766 A CN 110465766A CN 201910776096 A CN201910776096 A CN 201910776096A CN 110465766 A CN110465766 A CN 110465766A
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CN
China
Prior art keywords
conveyer belt
lithium battery
plate
nickel strap
battery group
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910776096.3A
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Chinese (zh)
Inventor
郑六军
Original Assignee
郑六军
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 郑六军 filed Critical 郑六军
Priority to CN201910776096.3A priority Critical patent/CN110465766A/en
Publication of CN110465766A publication Critical patent/CN110465766A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K31/00Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
    • B23K31/02Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23PMETAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P23/00Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
    • B23P23/04Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations

Abstract

The invention discloses a kind of lithium battery group parallel connection welders, including feeding conveyer belt and discharging conveyer belt, it is characterized by: sliding is provided with welding bench on the discharging conveyer belt, upper beam and lower beam are provided with above welding bench, sliding is provided with slide unit on lower beam, grasping plate is provided with below slide unit, swing rod is provided on upper beam, drive block and mounting plate, the upper end rotation of each swing rod is provided with idler wheel, spring is connected between two swing rods, the lower end of each swing rod is respectively arranged with soldering tip, drive block two sides are respectively formed with inclined-plane, driving motor and connecting rod are provided on mounting plate, one end of driving motor and crank is hinged, the other end of crank and one end of connecting rod are hinged, the other end of connecting rod and the upper end of oscillating rod are hinged, the lower end of oscillating rod is rotatably dispose in the upper end of drive block.The present invention provides a kind of lithium battery group parallel connection welders, realize the single welding in parallel of lithium battery automation, improve lithium battery welding efficiency.

Description

A kind of lithium battery group parallel connection welder
Technical field
The present invention relates to change lithium battery manufacturing field more particularly to a kind of lithium battery group parallel connection welder.
Background technique
Under increasingly developed electric car industry background, power battery technology is also constantly developed rapidly.Lithium battery is electricity The core of electrical automobile power battery has many advantages, such as energy density than high, long service life, light-weight, environmentally protective.Lithium ion Power battery is constituted after need to being connect in series and parallel by more piece single battery core, and needs to pass through the positive and negative electrode of single battery and nickel strap It carries out welding and realizes series-parallel connection, therefore the quality of welding procedure influences whether the performance of entire lithium ion battery packet, With the continuous development of power battery industry, the requirement to welding procedure is also higher and higher.
For this purpose, the Chinese utility model of existing Publication No. CN207188945U discloses " the dedicated laser of cylindrical lithium battery Bonding machine ", including welding platform, welding tooling, two guide rails, laser aid, mechanical arm and wire feeder, wherein it is described For welding platform to fixed cylindrical lithium battery to be welded, the welding tooling is fixedly installed in the welding platform, the Welder Dress is slidably fitted with first support connection sheet is positioned at cylindrical lithium battery cathode on first guide rail, and described second Second support is slidably fitted on guide rail, the laser aid is installed in the first support, the fixed peace of the mechanical arm Loaded in the second support, the wire feeder is installed on the mechanical arm.
Summary of the invention
The technical problem to be solved by the present invention is to be directed to the status of the prior art, a kind of lithium battery group parallel connection welding dress is provided It sets, realizes the single welding in parallel of lithium battery automation, improve lithium battery welding efficiency.
The technical scheme of the invention to solve the technical problem is: a kind of lithium battery group parallel connection welder, packet Feeding conveyer belt and discharging conveyer belt on the same line is included, the two sides of feeding conveyer belt are respectively disposed with nickel strap disk and use In the conveying roller conveyed to nickel strap, it is characterised in that: sliding is provided with welding bench on the discharging conveyer belt, welding bench Height and the height of feeding conveyer belt flush, and the end of feeding conveyer belt is provided with a barrier plate, and barrier plate and one stop cylinder Output end connection, the top of welding bench are provided with upper beam and lower beam along the length direction of discharging conveyer belt, on lower beam Sliding is provided with slide unit, and a lift cylinders are connected with below slide unit, the grasping plate of strip is connected with below lift cylinders, grasping plate Multiple shapes groove compatible with lithium battery outer wall is set side by side on downside;The wing is provided at left and right sides of upper beam Plate is hinged with the swing rod being vertically arranged on each wing plate, and the upper end rotation of each swing rod is provided with an idler wheel, two swing rods it Between be connected with spring above upper beam, the lower end of each swing rod is respectively arranged with a soldering tip, weldering is arranged on each soldering tip Needle, two soldering tips two sides positioned opposite in discharging conveyer belt are located at by soldering tip in the two sides of discharging conveyer belt and are respectively arranged with One nickel strap limit plate offers the limit channels passed through for nickel strap on each nickel strap limit plate, and soldering tip and nickel strap limit plate are simultaneously Column are arranged, are separately provided for the cutter cut off to nickel strap on each nickel strap limit plate, are provided with and are located on upper beam Drive block between two wing plates is respectively formed with the inclined-plane contacted with corresponding idler wheel at left and right sides of drive block, drive block Lower part is formed with the slide bar being slideably positioned on upper beam, and mounting plate is provided on the upper side of upper beam, is consolidated on mounting plate Surely it is provided with driving motor, the output end of driving motor and one end of crank are hinged, and a connecting rod, crank are hinged on mounting plate The other end and connecting rod one end it is hinged, the upper end of the other end of connecting rod and an oscillating rod is hinged, and the lower end of oscillating rod turns The dynamic upper end for being set to drive block.
As an improvement, corresponding to each groove in the grasping plate is provided with sucker, each sucker is connected with suction pipe, each suction Pipe is finally connect with an asepwirator pump.When needing to adsorb the lithium battery group on feeding conveyer belt, asepwirator pump produces at each sucker Raw negative pressure, each lithium battery are adsorbed in corresponding groove, and when the welding is completed, asepwirator pump stops working, and lithium battery group turns To discharging conveyer belt.
It improves again, is formed with a tilting table on discharging conveyer belt opposite side face on the welding bench, inclined by setting Sloping platform carries out discharging convenient for the lithium battery group after the completion of welding.
It improves again, the slide unit is in the upper move mode of lower beam, along the length of lower beam on the lower beam Direction is disposed with lead screw, and slide unit is set on lead screw, and lead screw is connect with a servo motor, using servo motor, improves cunning The positioning accuracy of platform.
It improves again, the bottom of the welding bench is connected with a rack gear, and rack gear is engaged with driving gear, drives gear and one turn The output end connection of dynamic motor.Gear intermittent rotary is driven using the drive of rotary electric machine, rack gear is with welding bench interval to unloading Expect that belt direction is mobile, later, rotary electric machine snap back rotation, rack gear is resetted with welding bench, re-moved to feeding At conveyer belt.
It improving again, the nickel strap limit plate includes substrate and cover board, the limiting slot for accommodating nickel strap is offered on substrate, Cover board is set on limiting slot.It is combined into nickel strap limit plate, using substrate and cover board form convenient for limiting in nickel strap limit plate Bit port shapes.
Compared with the prior art, the advantages of the present invention are as follows: lithium battery is delivered at barrier plate by feeding conveyer belt side by side, Welding bench and slide unit are moved at the barrier plate of feeding conveyer belt, lift cylinders with grasping plate downlink, feeding conveyer belt end Multiple lithium batteries are limited in grasping plate in corresponding groove, stop cylinder with barrier plate downlink, slide unit is moved to weldering with grasping plate On consecutive, stop sheet reset, feeding conveyer belt continues the end that lithium battery is delivered to feeding conveyer belt, welding bench and grabs Plate is followed at slide unit synchronizing moving to nickel strap limit plate, at the same time, nickel strap under the action of conveying roller, on each nickel strap disk Into in the limit channels of nickel strap limit plate, grasping plate and welding bench are with needing to weld row's lithium battery group interval to previous lithium The distance of cell widths, still further aspect, driving motor are rotated with crank, and crank is swung by connecting rod with oscillating rod, Oscillating rod drives drive block to move up and down, and the slope driving swing rod upper end of drive block downlink, drive block two sides is separated from each other, and two The soldering tip of swing rod lower end is mutually drawn close, and realization synchronizes welding, later, drive block to a lithium battery both ends on welding bench Uplink, under the action of the spring, swing rod upper end are mutually drawn close so that the soldering tip of two swing rod lower ends is separated from each other, welding bench to The distance of preceding one lithium battery width of movement, as drive block continuously moves up and down, while cooperating the gap of welding bench to Forward Dynamic, realization carries out welding in parallel to each lithium battery on welding bench one by one, after the completion of the lithium battery group welding on welding bench, cuts Knife cuts off nickel strap, and with continuing to move to for slide unit, the lithium battery group after the completion of welding is pushed into discharging conveyer belt by grasping plate, Lithium battery group after the completion of welding is delivered to next process by discharging conveyer belt, and grasping plate and welding bench re-move defeated to feeding It send at end of tape, continues the welding of next lithium battery group, to realize the single welding in parallel of lithium battery automation, improve Lithium battery welding efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of lithium battery group parallel connection welder in the embodiment of the present invention;
Fig. 2 is the moving structure schematic diagram of welding bench in the embodiment of the present invention;
Fig. 3 is the structural schematic diagram of nickel strap limit plate in the embodiment of the present invention.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
As shown in Figures 1 to 3, the lithium battery group parallel connection welder that this implementation is related to, including feeding conveyer belt 11, discharging Conveyer belt 12, nickel strap disk 2, conveying roller 21, nickel strap limit plate 22, cutter 24, welding bench 13, upper beam 3, driving motor, crank 43, connecting rod 44, oscillating rod 45, swing rod 6, drive block 5, spring 46, soldering tip 7, lower beam 3, slide unit 31, lift cylinders 32, grasping plate 33, rack gear 132, driving gear 133, rotary electric machine.
Wherein, on the same line, nickel strap disk 2 and conveying roller 21 are set to for feeding conveyer belt 11 and discharging conveyer belt 12 Expect the two sides of conveyer belt 11, the nickel strap 25 on nickel strap disk 2 passes through conveying roller 21, and conveying roller 21 is used to convey nickel strap 25, Sliding is provided with welding bench 13 on discharging conveyer belt 12, and specifically, the bottom of welding bench 13 is connected with a rack gear 132, rack gear 132 It is engaged with driving gear 133, driving gear 133 is connect with the output end of a rotary electric machine, is driven using the drive of rotary electric machine 133 intermittent rotary of gear, rack gear 132 is mobile to 12 direction of discharging conveyer belt with 13 interval of welding bench, and later, rotary electric machine is fast Speed rotates backward, and rack gear 132 is resetted with welding bench 13, re-moves to feeding conveyer belt 11, in addition, the height of welding bench 13 The height of degree and feeding conveyer belt 11 flushes, and the end of feeding conveyer belt 11 is provided with a barrier plate 8, and barrier plate 8 and one stop The output end of cylinder connects, and the top of welding bench 13 is provided with upper beam 4 and lower beam along the length direction of discharging conveyer belt 12 3, sliding is provided with slide unit 31 on lower beam 3, and specifically, slide unit 31 is in the upper move mode of lower beam 3, on lower beam 3 It is disposed with lead screw along the length direction of lower beam 3, slide unit 31 is set on lead screw, and lead screw is connect with a servo motor, is adopted With servo motor, the positioning accuracy of slide unit 31 is improved, the lower section of slide unit 31 is connected with a lift cylinders 32, the lower section of lift cylinders 32 It is connected with the grasping plate 33 of strip, it is compatible with 9 outer wall of lithium battery to be set side by side with multiple shapes on the downside of grasping plate 33 Groove 331;The left and right sides of upper beam 4 is provided with wing plate 42, the swing rod 6 being vertically arranged is hinged on each wing plate 42, each The upper end rotation of swing rod is provided with an idler wheel, the spring being connected with above upper beam between two swing rods, each swing rod 6 lower ends be respectively arranged with a soldering tip 7, capillary 71 is set on each soldering tip 7, and two soldering tips 7 are positioned opposite in discharging conveyer belt 12 two sides are located at by soldering tip 7 in the two sides of discharging conveyer belt 12 and are respectively arranged with a nickel strap limit plate 22, each nickel strap limit The limit channels passed through for nickel strap 25 are offered on plate 22, soldering tip 7 and nickel strap limit plate 22 are arranged in juxtaposition, each nickel strap limit The cutter 24 cut off to nickel strap, the output end company of each cutter 24 and a cutting cylinder 23 are separately provided on plate 22 It connects;The drive block 5 being provided on upper beam 4 between two wing plates 42, the left and right sides of drive block 5 be respectively formed with it is right The inclined-plane 51 for answering idler wheel 61 to contact, the lower part of drive block 5 is formed with the slide bar 52 being slideably positioned on upper beam 4, upper beam 4 Upper side on be provided with mounting plate 41, driving motor, the output end and crank of driving motor are fixedly installed on mounting plate 41 43 one end is hinged, and a connecting rod 44 is hinged on mounting plate 41, and connecting rod 44 is L-shaped, the other end and frame linking of crank 43 One end of bar 44 is hinged, and the upper end of the other end of connecting rod 44 and an oscillating rod 45 is hinged, and the lower end of oscillating rod 45 rotates setting In the upper end of drive block 5.
Further, it is corresponded in grasping plate 33 and is provided with sucker at each groove 331, each sucker is connected with suction pipe, each Suction pipe is finally connect with an asepwirator pump.When needing to adsorb the lithium battery group on feeding conveyer belt 11, asepwirator pump is in each sucker Place generates negative pressure, and each lithium battery is adsorbed in corresponding groove 331, and when the welding is completed, asepwirator pump stops working, lithium electricity Pond group is gone on discharging conveyer belt 12.
In addition, for the ease of the discharging of lithium battery group after welding, on welding bench 13 with 12 opposite side face of discharging conveyer belt On be formed with a tilting table 131, by be arranged tilting table 131, convenient for welding after the completion of lithium battery group carry out discharging.
In addition, nickel strap limit plate 22 includes substrate 221 and cover board 222, the limit for accommodating nickel strap is offered on substrate 221 Position slot, cover board 222 are set on limiting slot.25 limit plate of nickel strap is combined into using substrate 221 and 222 form of cover board, just Limit channels shapes in nickel strap limit plate 22.
To sum up, lithium battery 9 is delivered at barrier plate 8 by feeding conveyer belt 11 side by side, and welding bench 13 and slide unit 31 are moved to At the barrier plate 8 of feeding conveyer belt 11, lift cylinders 32 are with 33 downlink of grasping plate, multiple lithium batteries of 11 end of feeding conveyer belt It is limited in grasping plate 33 in corresponding groove 331, stops cylinder with 8 downlink of barrier plate, slide unit 31 is moved to weldering with grasping plate 33 On consecutive 13, barrier plate 8 resets, and feeding conveyer belt 11 continues the end that lithium battery 9 is delivered to feeding conveyer belt 11, welds Consecutive 13 and grasping plate 33 follow slide unit 31 synchronizing moving to nickel strap limit plate 22 at, at the same time, under the action of conveying roller 21, Nickel strap 25 on each nickel strap disk 2 enters in the limit channels of nickel strap limit plate 22, and grasping plate 33 and welding bench 13 are with needing to weld Distance of the row's lithium battery group interval to previous lithium battery width, still further aspect are connect, driving motor is rotated with crank 43, Crank 43 is swung by connecting rod 44 with oscillating rod 45, and oscillating rod 45 drives drive block 5 to move up and down, 5 downlink of drive block, is driven The inclined-plane 51 of 5 two sides of motion block pushes 6 upper end of swing rod to be separated from each other, and the soldering tip 7 of two 6 lower ends of swing rod is mutually drawn close, and realizes butt welding A lithium battery both ends on consecutive 13 synchronize welding, later, 5 uplink of drive block, under the action of spring 46, swing rod 6 Upper end is mutually drawn close, so that the soldering tip 7 of two 6 lower ends of swing rod is separated from each other, welding bench 13 moves forward a lithium battery width Distance while the gap of welding bench 13 being cooperated to move forward as drive block 5 continuously moves up and down, realization is to welding bench 13 On each lithium battery 9 carry out welding in parallel one by one, after the completion of the lithium battery group welding on welding bench 13, cutter 24 is by nickel strap 25 It is cut off, with continuing to move to for slide unit 31, the lithium battery group after the completion of welding is pushed into discharging conveyer belt 12, unloaded by grasping plate 33 Lithium battery group after the completion of welding is delivered to next process by material 12 bands of conveying, and grasping plate 33 and welding bench 13 re-move supreme Expect 11 end of conveyer belt, continues the welding of next lithium battery group, so that the single welding in parallel of lithium battery automation is realized, Improve lithium battery welding efficiency.

Claims (6)

1. a kind of lithium battery group parallel connection welder, including feeding conveyer belt (11) and discharging conveyer belt on the same line (12), the two sides of feeding conveyer belt (11) are respectively disposed with nickel strap disk (2) and the conveying for being conveyed to nickel strap (25) Roller (21), it is characterised in that: on the discharging conveyer belt (12) sliding be provided with welding bench (13), the height of welding bench (13) and The height of feeding conveyer belt (11) flushes, and the end of feeding conveyer belt (11) is provided with a barrier plate (8), barrier plate (8) and one Stop the output end connection of cylinder, the top of welding bench (13) is provided with upper beam along the length direction of discharging conveyer belt (12) (4) and lower beam (3) it, slides and is provided with slide unit (31) on lower beam (3), slide unit is connected with a lift cylinders below (31) (32), it is connected with the grasping plate (33) of strip below lift cylinders (32), is set side by side on the downside of grasping plate (33) multiple Shape groove (331) compatible with lithium battery (9) outer wall;Wing plate (42), Mei Geyi are provided at left and right sides of upper beam (4) The swing rod (6) being vertically arranged is hinged on plate (42), the upper end rotation of each swing rod (6) is provided with an idler wheel (61), at two The lower end of the spring (46) being connected with above upper beam (4) between swing rod (6), each swing rod (6) is respectively arranged with a weldering Capillary (71) are arranged on each soldering tip (7) in head (7), two soldering tip (7) two sides positioned opposite in discharging conveyer belt (12), In The two sides of discharging conveyer belt (12), which are located at by soldering tip, is respectively arranged with a nickel strap limit plate (22), on each nickel strap limit plate (22) The limit channels passed through for nickel strap (25) are offered, soldering tip (7) and nickel strap limit plate (22) are arranged in juxtaposition, each nickel strap limit The cutter (24) cut off to nickel strap (25) is separately provided on plate (22), upper beam is provided on (4) positioned at two Drive block (5) between wing plate (42) is respectively formed with the inclined-plane contacted with corresponding idler wheel (61) at left and right sides of drive block (4) (51), the lower part of drive block (5) is formed with the slide bar (52) being slideably positioned on upper beam (4), the upper side of upper beam (4) On be provided with mounting plate (41), be fixedly installed driving motor on mounting plate (41), the output end of driving motor and crank (43) One end it is hinged, be hinged on mounting plate (41) connecting rod (44), the other end of crank (43) and one end of connecting rod (44) Hingedly, the upper end of the other end of connecting rod (44) and an oscillating rod (45) is hinged, and the lower end of oscillating rod (45) is rotatably dispose in drive The upper end of motion block (5).
2. lithium battery group parallel connection welder according to claim 1, it is characterised in that: corresponding every on the grasping plate (33) Sucker is provided at a groove (331), each sucker is connected with suction pipe, and each suction pipe is finally connect with an asepwirator pump.
3. lithium battery group parallel connection welder according to claim 1, it is characterised in that: on the welding bench (13) with unload Material is formed with a tilting table (131) on conveyer belt (12) opposite side face.
4. lithium battery group parallel connection welder according to claim 1, it is characterised in that: the slide unit (31) is in lower beam (3) upper move mode is to be disposed with lead screw, slide unit (31) along the length direction of lower beam (3) on the lower beam (3) It is set on lead screw, lead screw is connect with a servo motor.
5. lithium battery group parallel connection welder according to claim 1, it is characterised in that: the bottom of the welding bench (13) It is connected with a rack gear (132), rack gear (132) is engaged with driving gear (133), and driving gear (133) is defeated with a driving motor Outlet connection.
6. lithium battery group parallel connection welder according to claim 1, it is characterised in that: nickel strap limit plate (22) packet Substrate (221) and cover board (222) are included, the limiting slot for accommodating nickel strap (25) is offered on substrate (221), cover board (222) is set It is placed on limiting slot.
CN201910776096.3A 2019-08-22 2019-08-22 A kind of lithium battery group parallel connection welder Pending CN110465766A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910776096.3A CN110465766A (en) 2019-08-22 2019-08-22 A kind of lithium battery group parallel connection welder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910776096.3A CN110465766A (en) 2019-08-22 2019-08-22 A kind of lithium battery group parallel connection welder

Publications (1)

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CN110465766A true CN110465766A (en) 2019-11-19

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112077485A (en) * 2020-08-10 2020-12-15 欧海华 Automatic welding equipment for pole pieces of parallel battery pack
CN112692401A (en) * 2020-12-31 2021-04-23 芜湖鼎瀚再制造技术有限公司 Open arc welding mobile system for on-line rail vehicle wheel set remanufacturing treatment
CN112935501A (en) * 2021-01-25 2021-06-11 尹国军 Spot welding system for series connection of multiple lithium batteries
CN112077485B (en) * 2020-08-10 2022-07-29 德清泰鑫金属制品有限公司 Automatic welding equipment for pole pieces of parallel battery pack

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112077485A (en) * 2020-08-10 2020-12-15 欧海华 Automatic welding equipment for pole pieces of parallel battery pack
CN112077485B (en) * 2020-08-10 2022-07-29 德清泰鑫金属制品有限公司 Automatic welding equipment for pole pieces of parallel battery pack
CN112692401A (en) * 2020-12-31 2021-04-23 芜湖鼎瀚再制造技术有限公司 Open arc welding mobile system for on-line rail vehicle wheel set remanufacturing treatment
CN112935501A (en) * 2021-01-25 2021-06-11 尹国军 Spot welding system for series connection of multiple lithium batteries

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Application publication date: 20191119

RJ01 Rejection of invention patent application after publication