CN103378321A - Cover plate component and battery with same - Google Patents
Cover plate component and battery with same Download PDFInfo
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- CN103378321A CN103378321A CN201210117690XA CN201210117690A CN103378321A CN 103378321 A CN103378321 A CN 103378321A CN 201210117690X A CN201210117690X A CN 201210117690XA CN 201210117690 A CN201210117690 A CN 201210117690A CN 103378321 A CN103378321 A CN 103378321A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a cover plate component and a battery with the same. The cover plate component comprises a cover plate body, a cover plate connecting element and an electrode terminal, wherein the cover plate connecting element is provided with an electrode hole which runs through the cover plate connecting element; the electrode terminal passes through the electrode hole and then is in insulation sealing with the cover plate connecting element; the cover plate body is provided with through holed running through the cover plate body; the electrode terminal passes through the through hole and leads current out; the cover plate connecting element and the cover plate body are connected in a seal mode. Through the technical scheme provided by the invention, the production efficiency can be improved, the manufacturing cost can be lowered, especially, the yield is high, and the safety performance is good; meanwhile, the cover plate component provided by the invention is stable in structure connection, has good seal performance, and lays a foundation for the actual application and development of ceramic seal batteries.
Description
Technical field
The present invention relates to a kind of cover plate assembly and contain the battery of this cover plate assembly.
Background technology
Lithium ion battery belongs to the important a kind of product of new forms of energy, has the advantages such as pollution-free, that capacity is high, have extended cycle life.The fields such as present lithium-ion-power cell, lithium ion instrument battery, the network energy.Lithium ion battery is with positive plate, barrier film, negative plate coiling or after being stacked to pole piece, and pole piece is put into the cavity of battery container and seal cover board formation, and the inner electrolyte that injects obtains after the steps such as sealing changes into.And seal cover board is as the indispensable parts assembly of lithium battery seal, its fail safe, sealing, resistance to ag(e)ing, insulating properties and space size of taking in battery etc. have very significance, cover plate assembly takies the certain cost of whole lithium battery in addition, provides its production efficiency, rate of finished products can largely reduce cost.
At present, lithium ion battery mainly adopts plastic injection-moulded reach sealing and insulation, cover plate main body all is carrying out injection moulding with anodal exit, negative pole exit and combining of integral type, so not only cause the moulding volume large, occur during injection moulding being difficult to reaching each position injection moulding seal consistency fine, fraction defective is high, also low problem of production efficiency, and metalwork need to pass through certain temperature during injection moulding, easily cause metalwork oxidized and contaminated, the integral cap plate material problems such as deliquescing that change.In addition, use be that injection molding plastic material plays the sealed insulation effect, the plastics ageing-resistant performance is not high, compactness is low, and is combustible material, useful life is shorter, security performance is lower.
Also there is at present research pottery to be used for the insulated enclosure of cover plate as seal, cover plate and pottery are welded, positive pole is drawn post, negative pole draws post and pottery welds, with the cover plate insulated enclosure, but cover plate is higher with the welding temperature of pottery, larger on the cover plate materials impact, deliquescing occurs in cover plate easily, strength decreased, the problems such as production efficiency is low, and cover plate is larger parts, there are various installing components on the cover plate, there is larger impact in the distortion of cover plate to the performance of cover plate, particularly affects being tightly connected of follow-up and battery container, and preparation increases with the technology difficulty of the cover plate assembly of battery container coupling, the battery fraction defective increases, and has affected its actual application and development.
Summary of the invention
The present invention is existing with the cover plate assembly difficulty preparation of pottery as seal, the technical problem that fraction defective is high in order to solve.A kind of easy preparation is provided, easier large-scale production, and the not deformation of when preparation, yield is high, with the cover plate assembly of the easier coupling of battery container and contain the battery of this cover plate assembly.
First purpose of the present invention provides a kind of cover plate assembly, comprises cover board body, cover board connecting component and electrode terminal; Have the electrode hole that runs through cover board connecting component on the cover board connecting component, electrode terminal passes insulated enclosure between electrode hole and cover board connecting component; Have the through hole that runs through cover board body on the cover board body, electrode terminal passes described through hole extracted current; Cover board connecting component and cover board body are tightly connected.
Preferably, cover board connecting component is arranged in above-mentioned through hole.
Preferably, cover board connecting component comprises a mounting groove, and above-mentioned electrode hole runs through the mounting groove bottom.
Preferably, prolong periphery on the mounting groove and comprise turnup structure, turnup structure is connected with cover board body.
Further preferred, through hole is stepped hole, and turnup structure is positioned on the step of stepped hole and is connected with cover plate.
Preferably, the cell wall of mounting groove is connected with the smooth transition that is connected to of mounting groove bottom, and the cell wall of mounting groove is connected to smooth transition with turnup structure and is connected.Smooth transition is connected to and well known to a person skilled in the art various connections, and for example arc connects.The cell wall of mounting groove, mounting groove bottom and turnup structure can be formed in one.
Preferably, clamping ceramic seal spare insulated enclosure between electrode terminal and the cover board connecting component.
Preferably, ceramic seal spare center is formed with mesopore, and electrode terminal passes above-mentioned mesopore.
Preferably, ceramic seal spare comprises that the sealing that is arranged in the electrode hole is connected the connecting portion that sealing is connected with cover board connecting component with external diameter.
Preferably, cover board connecting component comprises a mounting groove, and connecting portion is in mounting groove.
Preferably, be provided with the first metal solder layer between the inner surface of connecting portion and mounting groove bottom, the first metal solder layer is by forming by Welding again and between the inner surface of mounting groove bottom after being metallized in the connecting portion surface.
Perhaps preferred, also be provided with the transition metal ring plate between the inner surface of connecting portion and mounting groove bottom.
Preferably, electrode terminal comprises pole and polar cap, and wherein, the two ends of pole are first end and the second end, and polar cap is positioned at the first end of pole; Pole is arranged in the mesopore of ceramic seal spare, and the second end extends ceramic seal spare.
Preferably, ceramic seal spare comprises that the sealing that is arranged in the electrode hole is connected the connecting portion that sealing is connected with cover board connecting component with external diameter; Polar cap is connected with the connecting portion outer face.
Further preferred, be provided with the second metal solder layer between polar cap and the connecting portion outer face, the second metal solder layer forms by Welding after being metallized in the connecting portion outer face again and between the polar cap.
Perhaps further preferred, also be provided with the transition metal ring plate between polar cap and the connecting portion outer face.
Preferably, the transition metal ring plate is the kovar alloy sheet.The transition metal ring plate that is provided with between the inner surface of connecting portion and mounting groove bottom can be aluminium, aluminium alloy, kovar alloy or stainless steel substrates; The transition metal ring plate that is provided with between polar cap and the connecting portion outer face can be aluminium, aluminium alloy or kovar alloy sheet when electrode terminal is positive pole, can be copper, copper alloy or kovar alloy sheet when electrode terminal is negative pole.
Preferably, also be provided with buffer structure on the polar cap inner surface, be positioned between polar cap and connecting portion outer face.
Preferably, buffer structure is support ring.
Preferably, extend on the second end of pole of ceramic seal spare and also be connected with electrode connecting piece.
Further preferred, be provided with sealing ring between cover board connecting component and electrode connecting piece.
Preferably, the number of electrode terminal is a plurality of, has a plurality of electrode holes on the cover board connecting component.
Preferably, the number of electrode terminal is a plurality of, and the number of described cover board connecting component is a plurality of.
Another order of the present invention provides a kind of battery, comprising: cover plate assembly, battery container, pole piece and electrolyte, pole piece and electrolyte level are in battery container, and cover plate assembly and battery container are tightly connected; The inside battery electric current is drawn in electrode terminal on the described cover plate assembly and pole piece conducting, and described cover plate assembly is above-mentioned cover plate assembly.
The present invention adopts first electrode terminal with after the cover board connecting component insulated enclosure is connected, be connected with cover board body by cover board connecting component again, because cover board connecting component can adopt less structure, this less structure waits under the high temperature condition not yielding in welding, easy cleaning, particularly for the more excellent ceramic seal structure of the present invention, with ceramic seal spare high-temperature soldering the time, not yielding, and also capable of washing behind the sintering, conveniently be easy to get, again with cover board connecting component and cover board body welding, performance is more excellent, the Main Function of cover board connecting component is with ceramic seal spare, electrode terminal and cover board body are sealedly connected, therefore its shape there are not special requirement yet, volume is little, amorphism specific (special) requirements and special parts, can experience high temperature, high temperature distortion itself is also little, can not affect the sealing of battery, to weld with cover board connecting component and the cover board body of the same material of cover board body, realize easily, and the nothings such as intensity of cover board body affected that technical scheme of the present invention can be enhanced productivity, reduce cost of manufacture, particularly yield is high, and security performance is good, simultaneously cover plate assembly structure stable connection of the present invention, good seal performance is for practical application and the development of the battery of ceramic seal are laid a good foundation.
Description of drawings
Fig. 1 is the cross-sectional view that electrode terminal, seal, the cover board connecting component of embodiments of the invention assembled.
Fig. 2 is the cross-sectional view of the cover plate assembly of embodiments of the invention.
Fig. 3 is the cross-sectional view that electrode connects the cover plate assembly of pole piece that is connected with of embodiments of the invention.
Fig. 4 is the perspective view of the cover board connecting component of embodiments of the invention.
Fig. 5 is the perspective view of the electrode terminal of embodiments of the invention.
Fig. 6 is the perspective view of the ceramic seal spare of embodiments of the invention.
Fig. 7 is the cross-sectional view of the cover board body of embodiments of the invention.
Fig. 8 is the plan structure schematic diagram of the cover board body of embodiments of the invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is elaborated.Herein, same reference numerals represents the same composition part.And, should be appreciated that in description of the invention, " on ", the relative bearing term such as D score, each parts and the relative position of part in the cutaway view of cover plate assembly shown in Figure 1 thereof in the expression cover plate assembly are so that be described each parts and part thereof; But and be not used in that actual installation and the position relationship in lithium ion battery limits to these parts and part thereof, it may be not identical with the actual installation situation, is not limited to scope of the present invention.
Cover plate assembly of the present invention is used for the sealing of battery, is used for more sealing, the especially high-power lithium ion battery of lithium ion battery, for example: the sealing of lithium-ion-power cell, lithium-ion energy storage battery.Skilled in the art will recognize that lithium ion battery mainly comprises: the housing of at least one end opening, be positioned over the pole piece in the housing and be contained in electrolyte in the housing.For fear of spilling of electrolyte, adopt cover plate assembly that the openend of housing is sealed.Wherein, housing is generally aluminum hull or box hat, be used for placing pole piece and hold electrolyte, opening can be an i.e. end opening, from battery one end extracted current, also can be two, be both ends open, from the two ends extracted current of battery, the position of opening also without limits, can be from the minor face opening, pole piece is directly vertically put into battery container, and namely the opening exposed portions serve is the pole piece end of extracted current, also can be from long limit opening, the direct level of pole piece is put into battery container, and namely the opening exposed portions serve is the coiling arc-shaped edges of coiling pole piece.Described pole piece is formed by positive plate, barrier film, negative plate successively stacked or coiling, and the structure of pole piece and manufacture method can be passed through existing techniques in realizing, do not do at this and give unnecessary details.
Present embodiment specifically describes cover plate assembly, and as shown in Figure 1, cover plate assembly comprises cover board body 1, cover board connecting component 2 and electrode terminal 3.
Such as accompanying drawing 2,7, shown in 8, cover board body 1 is used for the sealing-in battery container, generally be provided with the through hole 11 that runs through cover board body 1 on the cover board body 1, be used for drawing the inside battery electric current, number the present invention of through hole 11 without limits, can design according to the number of the electrode terminal 3 that is used for extracted current that designs, for example when battery is an end extracted current, can contain a through hole 11 on the cover board body 1, the passing of electrode terminal 3 that is used for an a kind of polarity, at this moment, the electrode terminal 3 of another polarity for example lug can be connected extracted current with housing, and the electrode terminal 3 that generally passes cover board body 1 this moment generally needs insulation processing.Also can contain a plurality of through holes 11 on the cover board body 1, be used for passing of electrode terminal 3 or the passing of the electrode terminal 3 of a plurality of different pole pieces of a plurality of same polarities, when for the passing of the electrode terminal 3 of a plurality of different pole pieces, the electrode terminal 3 and cover board body 1 insulation processing that can only have a kind of pole piece, but also electrode terminal 3 and 1 equal insulation processing of cover board body.Shape the present invention of through hole 11 only needs to pass electrode terminal 3 and gets final product without limits, for example can be for running through the cylinder of cover board body 1, and diameter is a bit larger tham electrode terminal 3, and present embodiment specifically is preferably stepped hole, is used for engaging cover board connecting component 2 is installed.Number the present invention of cover board body 1 without limits, opening number according to battery container designs, and shape the present invention of cover board body 1 designs according to the shape of the opening of battery container also without limits, cooperate housing, for example can for circle also can be for square.Size for example thickness can be 1.5mm or 2.0mm.Material the present invention of cover board body 1 also without limits, such as being selected from aluminium alloy 3003, fine aluminium etc.Other structure example such as liquid injection port etc. can be passed through existing techniques in realizing with manufacture method on the cover board body 1, do not do at this and give unnecessary details.
Shown in accompanying drawing 1,2,3,4, have the electrode hole 21 that runs through cover board connecting component 2 on the cover board connecting component 2, electrode terminal 3 passes electrode hole 21 and 2 insulated enclosures of cover board connecting component.Cover board connecting component 2 is used for being tightly connected with cover board body 1, present embodiment is mainly ceramic seal spare 4, electrode terminal 3 is sealedly connected with cover board body 1, after first electrode terminal 3, ceramic seal spare 4, cover board connecting component 2 being made integrative-structure, with cover board connecting component 2 and cover board body 1 welding, realize the insulated enclosure of cover plate assembly again.The less parts of cover board connecting component 2 general employings, to shape, structure and position the present invention of cover board connecting component 2 without limits, such as can be at the upper surface of cover board body 1 or lower surface etc., adopt bow-shaped structural etc., the electrode terminal 3, ceramic seal spare 4, the cover board connecting component 2 that are made of one structure are connected with cover board body 1, when this moment, general electrode terminal 3 passed through hole 11 on the cover board body 1 electrode terminal 3 with 1 of cover board body and clamping has insulating sealer.Simplify technique etc. for strengthening the steadiness that connects, reaching, the preferred cover board connecting component 2 of the present invention is arranged in the through hole 11 of cover board body 1, better sealing-in.The installation of electrode terminal 3 is convenient in the present invention, and preferred, cover board connecting component 2 comprises a mounting groove 22, and electrode hole 21 runs through the bottom 223 of mounting groove 22.Preferably, prolong periphery on the mounting groove 22 and comprise turnup structure 221, be connected with cover board body 1 by turnup structure 221, not only weld more aspect, and can avoid because the impact that the change in size of a little is brought the sealing property of cover plate assembly during with ceramic seal spare 4 high-temperature soldering, sealing property is better, and technique is simpler, need not consider the scale error of cover board connecting component 2, the battery yield improves.And the through hole 11 of present embodiment can be set to stepped hole in the better situation, the turnup structure 221 of cover board connecting component 2 is positioned on the step 111 of stepped hole and is connected with cover plate, be turnup structure 221 engaging cover board bodies 1, overlap with stepped hole, connect more firm, the thickness that turnup structure 221 can be set can just compensate cover board body 1 part that lacks on the step 111 of stepped hole, be that cover board connecting component 2 can better be made of one structure with cover board body 1, improve the connectivity robustness of cover board connecting component 2 and cover board body 1, guarantee simultaneously the smooth of cover board body 1 surface, the less internal diameter of general design stepped hole is greater than mounting groove bottom 223 diameters, be convenient to place mounting groove, less than whole external diameter with mounting groove of turnup structure 221, stepped hole greater than whole external diameter with mounting groove of turnup structure 221, cooperates better than large diameter.Height the present invention of cover board connecting component 2 without limits can be less than the thickness of cover board body 1, preferably quite.Preferably, the cell wall 222 of mounting groove is connected with the smooth transition that is connected to of mounting groove bottom 223, for example such as accompanying drawing 1, can connect 224 for arc, the cell wall 222 of mounting groove is connected to smooth transition with turnup structure 221 and is connected, for example such as accompanying drawing 1, can connect 224 for arc, guaranteeing that each parts is fixedly connected with in the process can in time cushion mechanical stress and weaken, and can strengthen the bending strength of cover plate assembly, guarantee the good sealing property of cover plate assembly of the present invention, the stress that produces when wherein the cell wall 222 of mounting groove itself also can slow down cover board connecting component 2 with 4 welding of ceramic seal spare.Cover board connecting component 2 can be commercial, can adopt the one-body molded preparation of thinner sheet metal, and for example the thickness of battery connecting piece can be 0.8mm, can have certain toughness etc., convenient welding.
Number the present invention of the electrode hole 21 of cover board connecting component 2 without limits, for example can design according to the number of electrode terminal 3, for example a large cover board connecting component 2 can only be set in the through hole of cover board body 1, at the electrode hole of cover board connecting component 2 settings with extraction electrode terminal 3 equal numbers, then each electrode terminal 3 passes an electrode hole extracted current, and 2 of the electrode terminal 3 of at least a polarity and cover board connecting components are provided with insulating sealer.Also can design according to the number of electrical terminal the number of cover board connecting component 2, only have an electrode hole in the cover board connecting component 2, perhaps the electrode hole number of each cover board connecting component 2 is also different in a plurality of cover board connecting components 2.
The material of cover board connecting component 2 is generally selected the material consistent with cover board body 1.For example can be aluminium alloy 3003, fine aluminium, not only weld more conveniently, and guarantee the intensity of cover plate assembly.
Shown in accompanying drawing 1,2,3,5, the concrete preferred electrode terminal 3 of present embodiment comprises pole 32 and polar cap 31.Polar cap 31 and pole 32 can be one-body molded, also can be rear welding or cold-heading assemblings.Material the present invention of polar cap 31 and pole 32 can adopt conventional material without limits, for example for positive electrode terminal, can be for fine aluminium etc., and negative electrode terminal can be for fine copper etc.
Being shaped as of general pole 32 is cylindrical, and in the present embodiment, the diameter of pole 32 is 9 mm ± 0.5 mm, the size of other parts in the cover plate assembly, and for example: the large I of through hole 11, electrode hole 21, mesopore 41 is determined according to the diameter of pole 32.Polar cap 31 external diameters are greater than pole 32, can be for thicker cylindric, also can be for thinner circular metal plate etc., and the present invention also can process polar cap 31 without limits, is convenient to external loading such as top end face edge chamfer etc. and connects.Pole 32 comprises two ends, and an end is first end, and the other end is the second end, and polar cap 31 is positioned at the first end of pole 32, and electrode terminal 3 can be regarded " T " font as in the placement figure of present embodiment.Preferably, polar cap 31 inner surfaces are also to be provided with buffer structure 311 on the lower surface of polar cap 31 among Fig. 1, be used for buffering or reduce at the stress of electrode tip 3 during with 4 welding of ceramic seal spare, buffer structure 311 can be support ring in the better situation, namely make the ring-type support rim at the lower surface of polar cap 31, external diameter the present invention of ring-type support rim without limits, generally being slightly smaller than the polar cap external diameter gets final product, thickness also without limits, be generally corresponding clamping insulating sealer ring thickness 1/3 ~ 3/4, the height of boss can be greater than 1/3 of the height of the insulating sealer of corresponding clamping, and present embodiment is 8.8 for external diameter
0 -0.03Polar cap 21, can extend from outward flange 1.5 ± 0.05mm place at its lower surface highly is 1.0 ± 0.05mm, external diameter is 9.2 ± 0.05mm, internal diameter is that 8.2 ± 0.05mm is that thickness is the annular boss of 1.0 ± 0.05mm.Annular boss generally not with pole 32 combinations, its internal diameter is greater than pole 32 external diameters, and there is certain gap in 32 of poles.Buffer structure 311 can be one-body molded with polar cap 31, makes this structure when making polar cap 31, buffer structure 311 is welded on polar cap 31 lower surfaces after also can being.
Be provided with the insulating sealer insulated enclosure between general electrode terminal 3 and the cover board connecting component 2, insulating sealer the present invention without limits, for example can be moulding, technical scheme of the present invention can prevent that injection moulding high temperature is on the impact of cover board body 1 when for moulding.The present invention preferably adopts ceramic seal spare 4 insulated enclosures.Shown in accompanying drawing 1,2,3,6, preferably, ceramic seal spare 4 comprises that the sealings 42 that are arranged in the electrode hole 21 are connected the connecting portion 43 that sealing 42 is connected with cover board connecting component 2 with external diameter, connecting portion 43 is arranged in mounting groove and is connected with cover board connecting component 2 in the better situation, namely is fastened on mounting groove inside, easier welding, connect more firm, the external diameter of the aperture fitted seal section 42 of general design electrode hole 21 less than the external diameter of connecting portion 43, makes cover plate assembly have good sealing.Connection can be adopted the method for attachment that well known to a person skilled in the art various potteries and metal, such as adopting behind the ceramic surface metallization and metal solder etc., for example be specifically as follows between the inner surface of connecting portion 43 and mounting groove bottom 223 and be provided with the first metal solder layer (not shown), wherein, the first metal solder layer is by forming by Welding again and between the inner surface of mounting groove bottom after being metallized in the connecting portion surface, metallization can be adopted ceramic surface metallization technique common in the prior art, for example can carry out the manganese molybdenum to ceramic surface.Under the preferable case, ceramic metallization is finished also can proceed the element that nickel plating, aluminium etc. do not affect welding, to strengthen the mechanical strength of welding position and base material to be welded.Can also be preferably between the inner surface of connecting portion 43 and mounting groove bottom 223 by the transition metal ring being set, the mechanical stress that the transition metal ring plate produces when being used for buffering or reducing soldering.The transition metal ring plate can adopt common various easily and the metal material that welds of copper or copper alloy, aluminum or aluminum alloy, such as can adopt kovar alloy fine aluminium, aluminium alloy, etc.The maximum outside diameter of transition metal ring plate can be identical with the external diameter of the connecting portion of ceramic seal spare 4, also can be different, and the present invention does not have particular determination.More preferably in the situation, the element that nickel plating, aluminium etc. do not affect welding also can be carried out in transition metal ring plate surface, to strengthen the mechanical strength of welding position and base material to be welded.Welding repeats no more among the present invention for the welding procedure that those skilled in the art commonly use.Pass through Welding, can will make welding node place and base material to be welded form integrative-structure, it is the structure that is welded into one between cover board connecting component 2 and the ceramic seal spare 4, guarantee on the one hand its sealing intensity, reduce on the other hand the interface difference of material, thereby reduce the internal resistance of cover plate assembly, reduce the battery-heating amount.
Ceramic seal spare 4 centers are formed with mesopore 41, and electrode terminal 3 passes this mesopore 41, draws the inside battery electric current, simultaneously by ceramic seal spare 4 and cover board connecting component 2 insulation.In the present embodiment, mesopore 41 internal diameters of ceramic seal spare 4 mate with pole 32 external diameters of the electrode terminal 3 that passes it, the external diameter that can be a bit larger tham pole 32, so that form the gap between mesopore 41 and the pole 32, to avoid ceramic seal spare expanded by heating, less than the external diameter of polar cap 31, thereby guarantee to wear pole 32, polar cap 31 is connected on the ceramic seal spare 4, has good sealing thereby make between ceramic seal spare 4 and the electrode terminal 3.Polar cap 31 is connected with connecting portion 43 outer faces.Connection can be adopted the method for attachment that well known to a person skilled in the art various potteries and metal, such as adopting metal promoted solder flux etc., for example be specifically as follows and be provided with the second metal solder layer (not shown) between polar cap 31 and connecting portion 43 outer faces, the second metal solder layer forms by Welding after being metallized in connecting portion 43 outer faces again and between the polar cap 31.Wherein, the first metal solder layer forms by Welding after the connecting portion end face is metallized again and between the inner surface of polar cap 31, metallization can be adopted ceramic surface metallization technique common in the prior art, for example can carry out the manganese molybdenum to ceramic surface.Under the preferable case, ceramic metallization is finished also can proceed the element that nickel plating, aluminium etc. do not affect welding, to strengthen the mechanical strength of welding position and base material to be welded.Can also preferably between polar cap 31 and connecting portion 43 outer faces, also be provided with the transition metal ring plate, the mechanical stress that the transition metal ring plate produces when being used for buffering or reducing soldering.The transition metal ring plate can adopt common various easily and the metal material that welds of copper or copper alloy, aluminum or aluminum alloy, for example can adopt kovar alloy or copper or copper alloy, aluminum or aluminum alloy.The maximum outside diameter of transition metal ring plate can be identical with the external diameter of the connecting portion of ceramic seal spare 4, also can be different, and the present invention does not have particular determination.More preferably in the situation, the element that nickel plating, aluminium etc. do not affect welding also can be carried out in transition metal ring plate surface, to strengthen the mechanical strength of welding position and base material to be welded.。Welding repeats no more among the present invention for the welding procedure that those skilled in the art commonly use.Pass through Welding, can will make welding node place and base material to be welded form integrative-structure, it is the structure that is welded into one between cover board connecting component 2 and the ceramic seal spare 4, guarantee on the one hand its sealing intensity, reduce on the other hand the interface difference of material, thereby reduce the internal resistance of cover plate assembly, reduce the battery-heating amount.
Ceramic seal spare 4 can be in aluminium oxide ceramics ring, zirconia ceramics ring, aluminium nitride ceramics ring, boron nitride ceramics ring, silicon nitride ceramics ring, aluminium oxide and the zirconic composite ceramics ring a kind of, preferential oxidation aluminium ceramic ring, aluminium oxide and zirconic composite ceramics ring, in the present embodiment, the aperture of the mesopore that ceramic seal spare 4 middle parts form is ￠ 6.2 ± 0.1mm, thickness is 2.5 ± 0.1mm, the decay resistance of ceramic seal spare 4 is very good, can do not corroded by electrolyte, can guarantee the useful life of lithium ion battery; And impact strength, the thermal shock resistance of ceramic seal spare 4 are better than vitreum, so that the structure of cover plate assembly is more stable, sealing effectiveness is better; It is worth mentioning that adopt ceramic seal spare 4 as the sealing-in medium, compared to adopting ceramic wafer, its thickness is thicker, thermal shock resistance and thermal circulation performance are better.
In the present embodiment, pole 32 is located in the mesopore 41 of ceramic seal spare 4, and the second end extends ceramic seal spare 4, be used for battery container in pole piece conduct.In the better situation, electrode connecting piece 5 is set, the second end that extends the pole 32 of ceramic seal spare 4 is connected (as shown in Figure 3) with electrode connecting piece 5, again by the tab welding on electrode connecting piece 5 and the pole piece, realizes drawing of electric current.
Be generally and prevent short circuit, 5 of cover board body 1 or cover board connecting component 2 and electrode connecting piece need insulation processing, for example can put into sealing ring 6 between them.Present embodiment is specifically as follows the lower end that the sealing ring 6 of O type is set in ceramic seal spare 4, and the lower end of ceramic seal spare 4 is coated in the sealing ring 6, and sealing ring 6 can use PP or PE plastic rubber material etc. to be insoluble to the material of electrolyte.
The concrete manufacture method of the cover plate assembly of present embodiment comprises the steps:
Step 1, metallized in two surfaces of the connecting portion of ceramic seal spare.
An O RunddichtringO on the outer cover of step 4, the ceramic seal spare that after passing electrode hole, spills electrode hole and pole, again at the end of the pole that extends mesopore vertical welding one sheet electrode leading-out sheet, welding can be the physics welding method, the physics welding method is electric resistance welding, Laser Welding or ultrasonic bond, be used for the welding between realization metal and the metal, the processing step of electric resistance welding, Laser Welding or ultrasonic bond and parameter have been conventionally known to one of skill in the art, do not do at this and give unnecessary details.
Step 5, above-mentioned preparation all-in-one-piece electrode terminal, ceramic seal spare, cover board connecting component are put into the through hole of cover board body again, the turnup structure of cover board connecting component is overlapped on the step of stepped hole, after the welding of turnup structure and cover board body is made integrative-structure with cover plate assembly, welding can be the physics welding method, the physics welding method is electric resistance welding, Laser Welding or ultrasonic bond, be used for the welding between realization metal and the metal, the processing step of electric resistance welding, Laser Welding or ultrasonic bond and parameter have been conventionally known to one of skill in the art, do not do at this and give unnecessary details.
Above-mentioned preparation method, can be at electrode terminal of cover board body preparation, the electrode terminal that also can prepare opposed polarity, above-mentioned preparation method's order can be adjusted according to mounting means and welding temperature, general when electrode terminal is negative electrode terminal, can directly be prepared with reference to above-mentioned steps, when electrode terminal is the positive electricity end period of the day from 11 p.m. to 1 a.m, can adopt step 2,3 is merged again together welding after soon electrode terminal, ceramic seal spare, cover board body opsition dependent relation assemble first.For example when containing the electrode terminal of both positive and negative polarity, can be first for example negative electrode terminal and ceramic seal spare are made integrative-structure with a kind of electrode terminal of polarity with reference to above-mentioned steps 1,2, after with the assembling of integrative-structure and cover board body, refer again to step 1 with the electrical terminal of the another kind of polarity ceramic seal spare surface metalation of positive electrode terminal for example, after with positive electrode terminal, ceramic seal spare and cover board body assembling, refer again to step 3 and carry out the welding of negative electrode terminal, positive electrode terminal, carry out at last subsequent step etc.
When assembling whole lithium ion batteryFor example: an end opening of housing, pole piece is positioned in the housing, and fluid injection in the housing, the cover plate assembly that then will be manufactured with two electrode terminals is installed on this openend of housing, in this process, the periphery of cover plate assembly is welded mutually with housing, and the electrode leading-out sheet of cover plate assembly is connected (specifically with pole piece, the positive plate of pole piece is connected by the electrode leading-out sheet that is connected on anode ear and one of them electrode terminal, the negative plate of pole piece is connected by the electrode leading-out sheet that is connected on negative electrode lug and another electrode terminal, and concrete structure can pass through existing techniques in realizing), after the installation, form seal cavity between cover plate assembly and the housing, contain pole piece and electrolyte in the sealing space, two electrode terminals can external power consumption equipment respectively as the two poles of the earth of lithium ion battery.
Again for example: with the equal opening in the two ends of housing, difference mounting cover board component, wherein a cover plate assembly is the cover plate assembly that the anode electrode terminal is arranged, and another cover plate assembly is that the cover plate assembly of negative electrode terminal is arranged is example, these two cover plate assemblies are installed on respectively two openends of housing, in this process, the periphery of these two cover plate assemblies is welded mutually with housing, and the pole of these two cover plate assemblies is connected (specifically with pole piece, the positive plate of pole piece is connected by the pole of anode ear with the cover plate assembly that the anode electrode terminal is arranged, the negative plate of pole piece is connected by the pole of negative electrode lug with the cover plate assembly that the negative electrode terminal is arranged, concrete structure can pass through existing techniques in realizing), after the installation, form seal cavity between these two cover plate assemblies and the housing, contain pole piece and electrolyte in the sealing space, the stem stem of these two cover plate assemblies can external power consumption equipment respectively as the two poles of the earth of lithium ion battery.
The present invention adopts first electrode terminal with after the cover board connecting component insulated enclosure is connected, be connected with cover board body by cover board connecting component again, because cover board connecting component can adopt less structure, when being ceramic seal spare high-temperature soldering, not yielding, and also capable of washing behind the sintering, conveniently be easy to get, with cover board connecting component and cover board body welding, the Main Function of cover board connecting component is with ceramic seal spare again, electrode terminal and cover board body are sealedly connected, therefore its shape there are not special requirement yet, volume is little, amorphism specific (special) requirements and special parts, so during high temperature, itself is out of shape also little, can not affect the sealing of battery, will weld with cover board connecting component and the cover board body of the same material of cover board body, realize easily, and the nothing impacts such as intensity on cover board body, technical scheme of the present invention can be enhanced productivity, and it is high to reduce cost of manufacture, particularly yield, security performance is good, for practical application and the development of the battery of ceramic seal are laid a good foundation.
Those skilled in the art know easily; the above only is preferred embodiment of the present invention; not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.Protection scope of the present invention is determined by claims.
Claims (24)
1. a cover plate assembly is characterized in that, comprises cover board body, cover board connecting component and electrode terminal;
Have the electrode hole that runs through cover board connecting component on the described cover board connecting component, described electrode terminal passes insulated enclosure between electrode hole and cover board connecting component;
Have the through hole that runs through cover board body on the described cover board body, described electrode terminal passes described through hole extracted current;
Described cover board connecting component and cover board body are tightly connected.
2. cover plate assembly according to claim 1 is characterized in that, described cover board connecting component is arranged in described through hole.
3. cover plate assembly according to claim 1 is characterized in that, described cover board connecting component comprises a mounting groove, and described electrode hole runs through the mounting groove bottom.
4. cover plate assembly according to claim 3 is characterized in that, prolongs periphery on the described mounting groove and comprises turnup structure, and described turnup structure is connected with cover board body.
5. cover plate assembly according to claim 4 is characterized in that, described through hole is stepped hole, and described turnup structure is positioned on the step of stepped hole and is connected with cover plate.
6. cover plate assembly according to claim 4 is characterized in that, the cell wall of described mounting groove is connected with the smooth transition that is connected to of mounting groove bottom, and the cell wall of described mounting groove is connected to smooth transition with turnup structure and is connected.
7. cover plate assembly according to claim 1 is characterized in that, clamping ceramic seal spare insulated enclosure between described electrode terminal and the cover board connecting component.
8. cover plate assembly according to claim 7 is characterized in that, described ceramic seal spare center is formed with mesopore, and described electrode terminal passes described mesopore.
9. cover plate assembly according to claim 1 is characterized in that, described ceramic seal spare comprises that the sealing that is arranged in the electrode hole is connected the connecting portion that sealing is connected with cover board connecting component with external diameter.
10. cover plate assembly according to claim 9 is characterized in that, described cover board connecting component comprises a mounting groove, and described connecting portion is in mounting groove.
11. cover plate assembly according to claim 10, it is characterized in that, be provided with the first metal solder layer between the inner surface of described connecting portion and mounting groove bottom, described the first metal solder layer is by forming by Welding again and between the inner surface of mounting groove bottom after being metallized in the connecting portion surface.
12. cover plate assembly according to claim 10 is characterized in that, also is provided with the transition metal ring between the inner surface of described connecting portion and mounting groove bottom.
13. cover plate assembly according to claim 8 is characterized in that, described electrode terminal comprises pole and polar cap, and the two ends of described pole are first end and the second end, and described polar cap is positioned at the first end of pole; Described pole is arranged in the mesopore of ceramic seal spare, and the second end extends ceramic seal spare.
14. cover plate assembly according to claim 13 is characterized in that, described ceramic seal spare comprises that the sealing that is arranged in the electrode hole is connected the connecting portion that sealing is connected with cover board connecting component with external diameter; Described polar cap is connected with the connecting portion outer face.
15. cover plate assembly according to claim 14, it is characterized in that, be provided with the second metal solder layer between described polar cap and the connecting portion outer face, described the second metal solder layer forms by Welding after being metallized in the connecting portion outer face again and between the polar cap.
16. cover plate assembly according to claim 14 is characterized in that, also is provided with the transition metal ring plate between described polar cap and the connecting portion outer face.
17. according to claim 12 or 16 described cover plate assemblies, it is characterized in that the transition metal ring plate is the kovar alloy sheet.
18. cover plate assembly according to claim 14 is characterized in that, also is provided with buffer structure on the described polar cap inner surface and is positioned between polar cap and connecting portion outer face.
19. cover plate assembly according to claim 18 is characterized in that, described buffer structure is support ring.
20. cover plate assembly according to claim 13 is characterized in that, also is connected with electrode connecting piece on the second end of the described pole that extends ceramic seal spare.
21. cover plate assembly according to claim 20 is characterized in that, is provided with sealing ring between described cover board connecting component and electrode connecting piece.
22. cover plate assembly according to claim 1 is characterized in that, the number of described electrode terminal is a plurality of, has a plurality of electrode holes on the described cover board connecting component.
23. cover plate assembly according to claim 1 is characterized in that, the number of described electrode terminal is a plurality of, and the number of described cover board connecting component is a plurality of.
24. a battery comprises: cover plate assembly, battery container, pole piece and electrolyte, pole piece and electrolyte level are in battery container, and cover plate assembly and battery container are tightly connected; The inside battery electric current is drawn in electrode terminal on the described cover plate assembly and pole piece conducting, it is characterized in that, described cover plate assembly is the described cover plate assembly of claim 1-23 any one.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117690.XA CN103378321B (en) | 2012-04-20 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
| KR1020147001293A KR101554441B1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| PCT/CN2012/077667 WO2013000414A1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| EP12804665.3A EP2727166B1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| JP2014517423A JP5753317B2 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery including the same |
| US14/137,696 US10333131B2 (en) | 2011-06-28 | 2013-12-20 | Cover assembly and battery comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117690.XA CN103378321B (en) | 2012-04-20 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
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| Publication Number | Publication Date |
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| CN103378321A true CN103378321A (en) | 2013-10-30 |
| CN103378321B CN103378321B (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210117690.XA Active CN103378321B (en) | 2011-06-28 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
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| CN (1) | CN103378321B (en) |
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| CN107275529A (en) * | 2017-06-12 | 2017-10-20 | 广东康荣高科新材料股份有限公司 | A kind of negative electrode of lithium ion battery post sealing structure and its preparation technology |
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