A kind of power lithium-ion battery liquid injection port seals method for laser weldingTechnical field
The present invention relates to a kind of power lithium-ion battery liquid injection port to seal method for laser welding, belongs to lithium battery technology neckDomain.
Background technology
With the continuous progress of lithium-ion-power cell technology, the lithium ion battery of metal shell increasingly turns into main flow, goldBelong to the advantages of housing battery is due to high stability, high security, wide small volume and tolerable temperature scope, it is commerciallyOccupation rate constantly rises.Lithium battery in the fabrication process, when into battery container inject electrolyte after, due to electrolyte to be maintainedStability and need to be sealed the liquid injection port of battery container, at present generally using being laser welded seal, this kind of technologyEfficiency high, good sealing effect, prior art are first to determine the track of weld seam, select some point on weld seam to be used as starting point, swashLight rotates a circle around starting point and reached home, and terminal and starting point overlap, but laser-beam welding machine energy when going out laser and closing laserMeasure unstable, fried hole leakage can be caused, therefore the welding of terminal and starting point is unstable, beginning and end on soldered,Weld can be caused laser penetration housing or the complete situation of welded seal occur, it is also possible to the friendship of beginning and end occurDo not overlapped also at boundary, the situation that laser turns off, liquid injection port sealing is undesirable, the phenomenon of leakage occurs.
Chinese patent CN104772567B, discloses the method for laser welding for reducing the starting the arc and receiving arc defect, and this method isAt starting the arc end and receive arc end and change interaction angle between laser and mother metal, to regulate and control molten bath and aperture in welding processForm, so as to solve the problems, such as easily to produce defect at starting the arc end and receipts arc end during fusion welding, avoid in starting the arc end and receiptsThere is the unstable of laser beam welding in arc end, reaches the purpose for improving laser welding reliability, although this kind of method hasCertain effect, but want accurate starting the arc end and receive arc end position, and original incident direction, oblique incidence direction, receipts arc incidenceDirection, the requirement to purification bonding machine is higher, and intermediate demand translation-angle, practical operation are got up relatively difficult.
The content of the invention
The technical problem to be solved in the present invention, be to provide a kind of intersection for ensureing beginning and end very overlap,Sealing is strong, it is simple to operate, seal laser welding side without the power lithium-ion battery liquid injection port in accurate starting point and final positionMethod.
The present invention is realized by following proposal：A kind of power lithium-ion battery liquid injection port seals method for laser welding, will swashThe beginning and end of photocoagulator welding track is arranged on the position beyond laser welded seam.
By welding program the position beginning and end of laser-beam welding machine welding track being arranged on beyond laser welded seam.
The welding track is made up of laser welded seam, changeover portion and breeze way, and changeover portion is starting point between laser welded seamTrack, buffering section laser welded seam is to the track between terminal.
The intersection of the changeover portion and breeze way is some point fallen on laser welded seam.
The changeover portion and breeze way are linear or arc.
The changeover portion and breeze way are the tangent line of laser welded seam.
The laser welded seam falls between sealing valve block and battery container, and beginning and end falls the electricity beyond laser welded seamOn the housing of pond.
Liquid injection port is cleaned using laser marking machine before power lithium-ion battery liquid injection port seals laser welding, swashedThe laser that light marking machine is sent is as follows according to the circle of laser index carving cleaning track movement one, cleaning in the surrounding of liquid injection port：
Step 1, on laser marking machine CCD is installed and taken pictures detecting system；
Step 2, by CCD take pictures detecting system Automatic-searching liquid injection port and determine laser index carving clean track；
Step 3, the surface whole marking cleaning at laser welded seal position, crystallization electrolyte, foreign matter will be needed by going out laser automaticallyAnd surface oxide layer vaporization at high temperature during laser index carving, then taken away by smoke discharging dust removing system；
Step 4, enters the lower section of laser-beam welding machine after step 3 cleaning by streamline, and automatic sealing valve block of placing is carried outLaser welding.
Beneficial effects of the present invention are：
1st, a kind of power lithium-ion battery liquid injection port of present invention sealing method for laser welding by laser-beam welding machine welding trackBeginning and end is arranged on the position beyond weld seam, and preventing laser-beam welding machine, energy is unstable causes when going out laser and closing laserLaser welded seam fry hole leakage phenomenon, in the lump ensure beginning and end intersection very overlap, improve sealing；
2nd, a kind of beginning and end of power lithium-ion battery liquid injection port sealing method for laser welding of the present invention need to only fall in laserPosition beyond weld seam can be, it is necessary to which the position of accurate starting point and terminal, the laser welded seam distance that beginning and end arrives be without essenceReally, it is simple to operate.
Brief description of the drawings
Fig. 1 is a kind of welding track signal that a kind of power lithium-ion battery liquid injection port of the present invention seals method for laser weldingFigure.
Fig. 2 is that a kind of another welding track of power lithium-ion battery liquid injection port sealing method for laser welding of the present invention showsIt is intended to.
Fig. 3 is the welding track schematic diagram in background information.
In figure：1 is starting point, and 2 be terminal, and 3 be laser welded seam, and 4 be changeover portion, and 5 be breeze way, and 6 be sealing valve block, and 7 areBattery container.
Embodiment
With reference to Fig. 1-3, the present invention is further described, but the scope of the present invention does not limit to the content.
Wherein identical parts are presented with like reference characters.It should be noted that the word used below in descriptionLanguage "front", "rear", "left", "right", "up" and "down" refer to the direction in accompanying drawing, and word " interior " and " outer " refer respectively to courtTo or away from particular elements geometric centers direction, and accompanying drawing is compared using very simplified form and accurately using non-Rate, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
For clarity, not describing whole features of practical embodiments, in the following description, known function is not described in detailAnd structure, because they can make the present invention chaotic due to unnecessary details, it will be understood that opening in any practical embodimentsIn hair, it is necessary to a large amount of implementation details are made to realize the specific objective of developer, such as according to relevant system or relevant businessLimitation, another embodiment is changed into by one embodiment, additionally, it should think that this development is probably complicated and expendedTime, but it is only to those skilled in the art routine work.
A kind of power lithium-ion battery liquid injection port seals method for laser welding, by the starting point 1 of laser-beam welding machine welding trackThe position beyond laser welded seam 3 is arranged on terminal 2.
By welding program the position starting point 1 of laser-beam welding machine welding track and terminal 2 being arranged on beyond laser welded seam 3Put.
Welding track is made up of laser welded seam 3, changeover portion 4 and breeze way 5, changeover portion 4 be starting point 1 to laser welded seam 3 itBetween track, 5 laser welded seams 3 of breeze way arrive terminal 2 between track.
The intersection of changeover portion 4 and breeze way 5 is some point fallen on laser welded seam 3.
Changeover portion 4 and breeze way 5 are linear or arc.
Changeover portion 4 and the tangent line that breeze way 5 is laser welded seam 3.
Laser welded seam 3 falls between sealing valve block 6 and battery container 7, and starting point 1 and terminal 2 fall beyond laser welded seam 3On battery container 7.
Liquid injection port is cleaned using laser marking machine before power lithium-ion battery liquid injection port seals laser welding, swashedThe laser that light marking machine is sent is as follows according to the circle of laser index carving cleaning track movement one, cleaning in the surrounding of liquid injection port：
Step 1, on laser marking machine CCD is installed and taken pictures detecting system；
Step 2, by CCD take pictures detecting system Automatic-searching liquid injection port and determine laser index carving clean track；
Step 3, the surface whole marking cleaning at laser welded seal position, crystallization electrolyte, foreign matter will be needed by going out laser automaticallyAnd surface oxide layer vaporization at high temperature during laser index carving, then taken away by smoke discharging dust removing system；
Step 4, enters the lower section of laser-beam welding machine after step 3 cleaning by streamline, and automatic sealing valve block 6 of placing is carried outLaser welding.
Although more detailed elaboration is done to technical scheme and has been enumerated, it will be appreciated that for abilityFor field technique personnel, modification is made to above-described embodiment or uses equivalent alternative solution, this is to those skilled in the artIt is it is clear that these modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the present invention for memberClaimed scope.