CN202616327U - Electrode terminal, cover plate component and battery containing same - Google Patents
Electrode terminal, cover plate component and battery containing same Download PDFInfo
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- CN202616327U CN202616327U CN2012201702101U CN201220170210U CN202616327U CN 202616327 U CN202616327 U CN 202616327U CN 2012201702101 U CN2012201702101 U CN 2012201702101U CN 201220170210 U CN201220170210 U CN 201220170210U CN 202616327 U CN202616327 U CN 202616327U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides an electrode terminal, a cover plate component and a battery containing the same. The electrode terminal comprises an electrode pole and an electrode cap positioned at one end of the electrode pole, wherein the inner surface of the electrode cap is provided with a buffer structure, and the inner surface of the electrode terminal is an exposed surface of the surface of the electrode cap, which is contacted with the electrode pole. When the electrode terminal is welded with an insulating sealing piece, larger stress generated during welding of components of different materials with different expansion coefficients can be buffered so as to reduce the impacts of the component on the cover plate, so that the problem of easiness of crazing of a ceramic sealing piece, which is caused by stress during different materials with larger difference, is solved, and the reliability of a product is improved; and the electrode terminal and the cover plate component are easy to prepare. The prepared cover plate has the advantages of simple process, easiness of welding, high product yield and good stability and lays a foundation for the actual application and development of ceramic seal batteries.
Description
Technical field
The utility model relates to a kind of electrode terminal, cover plate assembly and contains 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 advantages such as pollution-free, that capacity is high, have extended cycle life.Fields such as present lithium-ion-power cell, lithium ion instrument battery, the network energy.Lithium ion battery is after positive plate, barrier film, negative plate are reeled or be stacked to pole piece, and pole piece is put into the cavity that battery container and seal cover board form, and inner injection electrolyte obtains after step such as changing into through sealing.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 in battery occupation space size etc. have very significance; Cover plate assembly takies certain cost of whole lithium battery in addition, provides its production efficiency, rate of finished products largely to 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 big, occur during injection moulding inaccessible each position injection moulding seal the problem that consistency is fine, fraction defective is high, production efficiency is also low, and metalwork need pass through certain temperature during injection moulding; Be prone to cause metalwork oxidized and contaminated, the integral cap panel material problems such as deliquescing that change.In addition, use be that the injection-moulded 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.
At present also there is research pottery to be used for the insulated enclosure of cover plate as seal; But because difficult welding of pottery and frangible being prone to are split; Present application only is confined to the application of ceramic gasket, all also needs other conventional for example plastic cement seal members etc. to be used for the sealing between cover plate and the electrode terminal.When the ceramic seal spare insulated enclosure of clamping between cover plate and the electrode terminal; Because the difference of material, produce bigger stress during welding and make the frangible ceramic seal spare that is prone to split cracked, increased unreliability, the uncontrollability of product; The security performance of lithium battery is reduced; Technology difficulty increases simultaneously, and the battery fraction defective increases, and has influenced its practical application and development.
Summary of the invention
The utility model is existing with the cover plate assembly difficulty welding of pottery as seal in order to solve, and fraction defective is high, and influences the technical problem of the security performance of battery.A kind of easy preparation is provided, more has been prone to large-scale production, and ceramic seal spare is not easily broken during preparation, yield is high, cover plate assembly that security performance is high and the electrode terminal for preparing this cover plate assembly with and contain the battery of this cover plate assembly.
First order of the utility model provides the polar cap that a kind of electrode terminal comprises pole and is positioned at pole one end; Wherein, the polar cap inner surface is provided with buffer structure, and wherein, the inner surface of the utility model is meant the outer drain surface of the one side that polar cap contacts with pole.
Preferably, buffer structure is a support ring.
Preferably, buffer structure and polar cap are structure as a whole.
Preferably, the internal diameter of support ring is more than or equal to the external diameter of polar cap.
Perhaps preferred, the external diameter of support ring is less than the external diameter of polar cap.
Preferably, polar cap is the sheet metal of thickness 0.5-1.0mm.
Perhaps preferred, polar cap is that height is greater than pole height 1/4, less than the cylinder of pole height 1/2.
Preferably, the outer face periphery of polar cap contains lead angle.
Preferably, pole comprises two sections, and one section that contacts with polar cap is first pole, and another section is second pole, and wherein, the external diameter of second pole is less than first pole.
Second order of the utility model provides a kind of cover plate assembly, comprises cover board body, insulating sealer and electrode terminal; Wherein, electrode terminal is above-mentioned electrode terminal; Wherein, have the through hole that runs through cover board body on the cover board body, the pole of electrode terminal passes said through hole projected current; Clamping insulating sealer insulated enclosure between cover board body and electrode terminal; Buffer structure is between polar cap and insulating sealer.
Preferably, through hole contains the mounting groove on protrusion cover board body surface, and electrode hole is contained in the mounting groove bottom, and wherein, the pole of electrode terminal passes above-mentioned electrode hole.Wherein, the cover board body surface can refer to that the upper surface that battery leaks outside also can refer to be positioned at the inner lower surface of battery container.
Further preferred, the periphery edge of electrode hole contains second lead angle.
Preferably, the edge seal is a ceramic seal spare, and ceramic seal spare center is formed with mesopore, and wherein, the pole of electrode terminal passes above-mentioned mesopore.
Preferably, the porcelain seal comprises the connecting portion that the sealing that is arranged in the through hole and external diameter are connected with cover board body greater than sealing and buffer structure.
Perhaps preferred, through hole contains the mounting groove on protrusion cover board body surface, and electrode hole is contained in the mounting groove bottom, ceramic seal spare comprise the sealing that is arranged in the electrode hole and external diameter greater than sealing bottom mounting groove with cushion the connecting portion that structure is connected.
Further preferred, connecting portion is in through hole.
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 through form through the soldering welding after being metallized in the connecting portion surface again and between the inner surface of mounting groove bottom.
Perhaps preferred, also be provided with the transition metal ring between the inner surface of connecting portion and mounting groove bottom.
Preferably, be provided with the second metal solder layer between buffer structure and the connecting portion outer face, the second metal solder layer is through form through the soldering welding after being metallized in the connecting portion outer face again and between the buffer structure.
Perhaps preferred, also be provided with the transition metal ring plate between buffer structure and the connecting portion outer face.
Preferably, pole comprises two sections, and one section that contacts with polar cap is first pole, and another section is second pole, and the external diameter of second pole is less than first pole, and first pole is arranged in the mesopore of ceramic seal spare and second pole extends ceramic seal spare together.
Further preferred, cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the electrode connecting piece, and wherein, second pole is installed in the above-mentioned installing hole.
Perhaps preferred, cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the electrode connecting piece, and wherein, polar cap is installed in the above-mentioned installing hole.
Preferably, be provided with sealing ring between cover board body and electrode connecting piece.
Preferably, the number of electrode terminal is a plurality of, has a plurality of through holes on the said cover board body.
The 3rd order of the utility model provides a kind of battery, and 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 said cover plate assembly and pole piece conducting, it is characterized in that, said cover plate assembly is above-mentioned cover plate assembly.
The utility model adopts the electrode terminal with buffer structure; When electrode terminal and insulating sealer welding; Can well slow down the big stress that the different coefficient of expansion parts of different materials are produced when welding; Reduce its influence to cover plate assembly, the stress that has occurred when having solved the different materials welding that differs greatly especially causes ceramic seal spare to be prone to cracked problem, has improved reliability of products; The lithium battery of the preferred ceramic seal cover plate assembly of the utility model has long characteristics of ageing-resistant life-span simultaneously, and security performance is higher.The preferred through hole of the utility model contains the mounting groove on protrusion cover board body surface simultaneously; Electrode hole is contained in the mounting groove bottom, and wherein, the pole of electrode terminal passes above-mentioned electrode hole; Stress in the time of further solving the welding of insulating sealer and cover board body further improves cushioning effect.The electrode terminal of the utility model, cover plate assembly are prone to preparation.The cover plate assembly technology of preparation is simple, is prone to welding, and the yield of product is high, and good stability is for the practical application and the development of the battery of ceramic seal are laid a good foundation.
Description of drawings
Fig. 1 is the perspective view of a kind of electrode terminal of the utility model.
Fig. 2 is the cross-sectional view of electrode terminal of the embodiment of the utility model.
Fig. 3 is the perspective view of electrode terminal of the embodiment of the utility model.
Fig. 4 is the cross-sectional view of cover plate assembly of the embodiment of the utility model.
Fig. 5 is the cross-sectional view of cover board body of the embodiment of the utility model.
Fig. 6 is the local structure for amplifying sketch map of through hole on the cover board body of embodiment of the utility model.
Fig. 7 is the perspective view of ceramic seal spare of the embodiment of the utility model.
Fig. 8 is the battery cross-sectional view of the embodiment of the utility model.
Embodiment
In order to make the utility model technical problem to be solved, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Embodiment
Embodiment to the utility model is elaborated with reference to the accompanying drawings.Among this paper, same reference numerals is represented the same composition part.And; Should be appreciated that in the description of the utility model, " on ", 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 describe each parts and part thereof; But and be not used in these parts and part thereof actual installation and the position relation in lithium ion battery limited, it maybe be inequality with the actual installation situation, is not limited to the scope of the utility model.
The cover plate assembly of the utility model is used for the sealing of battery, is used for the sealing of lithium ion battery more, high-power lithium ion battery especially, 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 the 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, is used to place pole piece and holds electrolyte; Opening can from battery one end projected current, also can be two for an i.e. end opening; Be both ends open, from the two ends projected current of battery, the position of opening is not restriction also; Can be from the minor face opening, pole piece is directly vertically put into battery container, and promptly the opening exposed portions serve is the pole piece end of projected current; Also can be from growing the limit opening, the pole piece Direct Water keeps flat in the battery container, and promptly the opening exposed portions serve is the coiling circular arc limit of coiling pole piece.Said pole piece is stacked successively or reel and to form by positive plate, barrier film, negative plate, 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 4, cover plate assembly comprises cover board body 1, electrode terminal 2 and insulating sealer.
Electrode terminal 2 is drawn the inside battery electric current with the pole piece conducting, and number the utility model of electrode terminal 2 is restriction not, designs according to the size of projected current.Electrode terminal 2 is generally the metallic conduction parts that connect lug, can directly realize conducting with pole piece with the lug that is provided with on pole piece welding, also can pass through the connection brace, brace again with pole piece on realization such as the lug welding that is provided with and pole piece conduct.
The electrode terminal 2 of the utility model comprises pole 22 and is positioned at the polar cap 21 of pole one end.Polar cap 21 can be one-body molded with pole 22, also can be back welding or cold-heading assembling.Material the utility model of polar cap 21 and pole 22 is restriction not, can adopt conventional material, for example for positive electrode terminal, can be fine aluminium, aluminium alloy etc., and negative electrode terminal can be for fine copper etc.
Shape the utility model of polar cap 21 and pole 22 is restriction not; Only being required to be mutual cross-coupled two parts gets final product; Be generally vertical connection; For example can be being connected of orthogonal rectangle sheet pole and rectangle sheet polar cap, assemble that electrode terminal 2 can be regarded down " T " font as in the placement figure of present embodiment according to actual conditions.Present embodiment is specifically described so that being shaped as of pole 22 is cylindrical; In the present embodiment, the diameter of pole 22 is 6.0 ± 0.05mm; The size of other parts in the cover plate assembly, for example: the big I of through hole 11, electrode hole 1111, mesopore 33 is confirmed according to the diameter of pole 22.Shape the utility model of polar cap 21 preferably cooperates with the cylindrical of pole 22, and its orthographic projection is circular, for example can be for thicker cylindric, preferred, greater than 1/4 of pole height, less than 1/2 of pole height.In the present embodiment, highly be specially 2.5 ± 0.05mm, the bottom surface diameter is specially 8.8
0 -0.03Mm, like accompanying drawing 2, shown in 3, also can be for thin circular metal plate etc., thickness can be 0.8mm, external diameter is greater than pole, shown in accompanying drawing 1.The utility model is restriction not.
The improvements of the utility model are that polar cap 21 inner surfaces are provided with buffer structure.In accompanying drawing 1,2,3, promptly the lower surface of polar cap 21 is provided with buffer structure, when electrode terminal and insulating sealer welding, can slow down the stress between different materials, reduces to weld the influence to cover plate assembly.Buffer structure the utility model is restriction not; General need be played buffering effect and get final product; General only need that a support component is set get final product between polar cap 21 and insulating sealer, for example can for the integrated boss of polar cap, the number of boss and shape do not have to limit; Also can be at the one-body molded honeycomb metallic object of polar cap lower surface with buffering effect, the honeycomb metallic object can be sheet etc.The utility model is preferably support ring 211, promptly on the lower surface of polar cap, makes the annular supports boss, and shape the utility model of support ring 211 is not restriction also; Only be required to be ring bodies and get final product, for example can be annulus, also can be square ring; Hexahedron ring etc.; External diameter the utility model of annular supports boss is restriction not, can be greater than the external diameter of polar cap, and also can be less than the external diameter of polar cap; The internal diameter of the support ring 211 of the utility model can be more than or equal to the external diameter of polar cap 21, then this moment general polar cap 21 with supporting ring 211 between contain and be provided with part and be connected surperficial.The external diameter of support ring 211 also can be less than the external diameter of polar cap 21; The annular supports boss can combine with the pole 22 of polar cap 21 lower surfaces, promptly is coated on part pole surface, also can not combine with pole 22; Its internal diameter is greater than pole 22 external diameters, and there is certain clearance in 22 of poles.The ring thickness of supporting ring 211 is not restriction also, be generally corresponding clamping insulating sealer ring thickness 1/3 ~ 3/4,1/4 ~ 1/2 of the height of the insulating sealer that the height of boss can corresponding clamping, present embodiment is 8.8 for external diameter
0 -0.03The polar cap 21 of mm, can extend from outward flange 0.8 ± 0.05mm place at its lower surface highly is 1.0 ± 0.05mm, and external diameter is 9.2 ± 0.05mm, and internal diameter is that 8.2 ± 0.05mm is that thickness is the annular boss of 1.0 ± 0.05mm.Buffer structure can be one-body molded with polar cap 21, when making polar cap 21, makes this structure, buffer structure is welded on polar cap 21 lower surfaces after also can being.
The utility model also can be handled the outer face of polar cap 21, and for example periphery contains first lead angle 212 in the outer face of polar cap.Be convenient to be connected with external loading or is connected with electrode connecting piece, more be prone to be fit in the installing hole of electrode connecting piece and weld, simultaneously as for soldering processes also can prevent the solder stream that looses, concentrated solder is at the soldering opening place.
Cover board body 1 is used for the sealing-in battery container, shown in accompanying drawing 5, generally is provided with the through hole 11 that runs through cover board body on the cover board body 1; Be used to draw the inside battery electric current, number the utility model of through hole 11 is restriction not, can design according to the number of the electrode terminal that is used for projected current 2 that designs; For example when battery is an end projected current; Can contain a through hole 11 on the cover board body 1, be used for the passing of electrode terminal 2 of an a kind of polarity, at this moment; The electrode terminal 2 of another polarity for example lug can be connected projected current with housing, and the electrode terminal 2 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 the passing of electrode terminal 2 or the passing of the electrode terminal 2 of a plurality of different pole pieces of a plurality of same polarities; When for the passing of the electrode terminal 2 of a plurality of different pole pieces; The electrode terminal 2 and cover board body 1 insulation processing that can have only a kind of polarity, but also electrode terminal 2 and 1 equal insulation processing of cover board body.
Shape the utility model of through hole 11 is restriction not, and the pole 22 that only needs to pass electrode terminal 2 gets final product, for example can be for running through the cylinder of cover board body 1; Diameter is a bit larger tham the external diameter of the pole 22 of electrode terminal 2; Can engage with polar cap 21 less than the external diameter of polar cap 21, also can be greater than the external diameter of polar cap 21; Polar cap 21 all or part of being positioned at wherein, the utility model is restriction not.Shown in accompanying drawing 6; The concrete preferred through hole 11 of present embodiment contains the mounting groove 111 on protrusion cover board body 1 surface; The surface of cover board body 1 can refer to that the upper surface that battery leaks outside also can refer to be positioned at the inner lower surface of battery container; Design according to the installation of electrode terminal 2 relation, for example be used for outward being connected, when second pole 222 is positioned at battery container and is used for being connected with pole piece with load when the polar cap 21 of electrode terminal 2 is positioned at battery container; Mounting groove 111 can be positioned at enclosure interior, and promptly the lower surface of cover board body 1 is protruding with mounting groove 111; When being positioned at, second pole 222 of electrode terminal 2 is used for outside the battery container being connected with load; When the polar cap 21 of electrode terminal 2 is positioned at battery container and is used for being connected with pole piece; Mounting groove 111 can be positioned at outside, and promptly the upper surface of cover board body 1 is protruding with mounting groove 111.To the installation relation of the accompanying drawing 4 of present embodiment, the upper surface that leaks outside for battery is protruding with mounting groove 111.Mounting groove 111 can be structure as a whole with cover board body 1 also can be the back welding; Mounting groove 111 annexations own are preferably smooth transition and connect; For example there is not obvious turning; Be arc transition, mounting groove 111 with also be preferably smooth transition being connected of cover board body 1 and connect, for example do not have obvious turning.Guarantee in time mechanical stress to be cushioned and to weaken in each parts fixed connection process, and can strengthen the bending strength of cover plate assembly, guarantee the excellent sealing property of the cover plate assembly of the utility model.Wherein, contain electrode hole 1111 in the mounting groove bottom, the pole 22 of electrode terminal 2 passes above-mentioned electrode hole 1111.Number the utility model of electrode hole 1111 is restriction not; For example can design according to the number of electrode terminal 2; For example a big through hole 11 can be set on cover board body, only outstanding big mounting groove 111 on this big through hole 11 is at the electrode hole 1111 of mounting groove bottom setting with extraction electrode terminal 2 equal numbers; Each electrode terminal 2 passes electrode hole 1111 projected currents then, 111 clamping insulating sealers of the electrode terminal 2 of at least a polarity and mounting groove.Also can be according to the number of the number design and installation groove 111 of electrical terminal 2, the mounting groove bottom has only an electrode hole 1111, and electrode hole 1111 numbers of each mounting groove bottom are also different in perhaps a plurality of mounting grooves 111.Like Fig. 6, shown in 7, preferred, the periphery edge of electrode hole 1111 contains second lead angle 1112, is convenient to penetrating, passing of ceramic seal spare and electrode terminal, and technology is simple to operation.
Number the utility model of cover board body 1 is restriction not; Opening number according to battery container designs, and shape the utility model of cover board body 1 is not restriction also, designs according to the shape of the opening of battery container; Cooperate housing, for example can for circle also can be for square.Size for example thickness can be 2.0mm.Material the utility model of cover board body is not restriction also, for example can be selected from fine aluminium, aluminium alloy 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.
Cover board body 1 and 2 clamping insulating sealers of electrode terminal insulated enclosure, buffer structure is between polar cap 21 and insulating sealer.Insulating sealer the utility model is restriction not; For example can be moulding, shown in accompanying drawing 7, the utility model preferably adopts ceramic seal spare 3 insulated enclosures; Wherein, Ceramic seal spare 3 centers are formed with mesopore 33, and the pole 22 of electrode terminal 2 passes above-mentioned mesopore 33,1 clamping ceramic seal spare 3 insulated enclosure of pole 22 and cover board body.In the present embodiment, mesopore 33 internal diameters of ceramic seal spare 3 mate with pole 22 external diameters of the electrode terminal 2 that passes it, can be a bit larger tham the external diameter of pole 22; Make and form the gap between mesopore 33 and the pole 22; To avoid ceramic seal spare 3 expanded by heating,, thereby guarantee to wear pole 22 less than the external diameter of polar cap 21; Polar cap 21 is connected on the ceramic seal spare 3, has good sealing property thereby make between ceramic seal spare 3 and the electrode terminal 2.
Ceramic seal spare 3 comprises sealing 31 and the connecting portion 32 of external diameter greater than sealing; Cover board body 1 for conventional through hole 11; Sealing 31 generally is arranged in the through hole 11; Be clamped between pole 22 and the cover board body 1, connecting portion 32 generally is clamped between buffer structure and the cover board body 1, and two surfaces are connected with cover board body 1 with buffer structure respectively.In the present embodiment, through hole 11 contains the mounting groove 111 on protrusion cover board body 1 surface, and the sealing 31 of ceramic seal spare 3 can be arranged in the electrode hole 1111, and two surfaces of connecting portion 32 can be connected with the buffering structure with the mounting groove bottom interior surface respectively; Connecting portion promptly is fastened on mounting groove 111 inside in mounting groove 111, welding connects more firm more easily; Wherein, connecting portion 32 can all be positioned at through hole 11, promptly highly is lower than cover board body 1 thickness; Also can partly be positioned at through hole 11, promptly highly be higher than cover board body 1 thickness, perhaps identical with cover board body 1 thickness; The utility model is restriction not, and in the present embodiment, the aperture of through hole 11 is more than or equal to the external diameter of connecting portion 32; The external diameter of the aperture fitted seal portion 31 of electrode hole 1111 less than the external diameter of connecting portion 32, makes cover plate assembly have good sealing property.Connecting portion 32 can adopt the method for attachment that well known to a person skilled in the art various potteries and metal with being connected of mounting groove bottom; For example can adopt metal promoted solder flux etc.; For example specifically can be between the inner surface of connecting portion 32 and mounting groove bottom, being provided with the first metal solder layer (not shown); Wherein, The first metal solder layer is through form through the soldering welding after being metallized in connecting portion 32 surfaces again and between the inner surface of mounting groove bottom, and metallization can be adopted ceramic surface metallization technology common in the prior art, for example can carry out the manganese molybdenumization to ceramic surface.Under the preferable case, ceramic metallization is accomplished also can proceed the element that nickel plating, aluminium etc. do not influence 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 32 and mounting groove bottom through the transition metal ring is set, the mechanical stress that the transition metal ring plate is used to cushion or produces when reducing soldering.The metal material that the transition metal ring plate can adopt common various easy aluminum or aluminum alloy to weld for example can adopt 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 32 of ceramic seal spare 3, also can be different, and the utility model does not have particular determination.Soldering is welded as the welding procedure that those skilled in the art use always, repeats no more in the utility model.Weld through soldering; Can will make welding node place and base material to be welded be integrally formed structure; Be the structure that is welded into one between mounting groove 111 and the ceramic seal spare 3, guarantee its sealing intensity on the one hand, reduce the interface difference of material on the other hand; Thereby reduce the internal resistance of cover plate assembly, reduce the battery caloric value.
Buffer structure can adopt the method for attachment that well known to a person skilled in the art various potteries and metal with being connected also of connecting portion 32 outer faces; For example can adopt welding material of metal etc.; For example specifically can be between buffer structure and connecting portion 32 outer faces, being provided with the second metal solder layer (not shown), the second metal solder layer is through form through the soldering welding after being metallized in connecting portion 32 outer faces again and between the buffer structure.Wherein, The first metal solder layer is through form through the soldering welding after the connecting portion end face is metallized again and between the inner surface of buffer structure; Metallization can be adopted ceramic surface metallization technology common in the prior art, for example can carry out the manganese molybdenumization to ceramic surface.Under the preferable case, ceramic metallization is accomplished also can proceed the element that nickel plating, aluminium etc. do not influence welding, to strengthen the mechanical strength of welding position and base material to be welded.Can also preferably between buffer structure and connecting portion 32 outer faces, also be provided with the transition metal ring plate, the mechanical stress that the transition metal ring plate is used to cushion or produces when reducing soldering.The transition metal ring plate can adopt the common various metal material that welds with copper or copper alloy, aluminum or aluminum alloy of being prone to, and for example can adopt kovar alloy, 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 32 of ceramic seal spare 3, also can be different, and the utility model does not have particular determination.More preferably under the situation, the element that nickel plating, aluminium etc. do not influence 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.Soldering is welded as the welding procedure that those skilled in the art use always, repeats no more in the utility model.Weld through soldering; Can will make welding node place and base material to be welded be integrally formed structure; Be the structure that is welded into one between polar cap 21 and the ceramic seal spare 3 of electrode terminal, guarantee its sealing intensity on the one hand, reduce the interface difference of material on the other hand; Thereby reduce the internal resistance of cover plate assembly, reduce the battery caloric value.
Ceramic seal spare 3 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; Preferred aluminium oxide ceramic ring, aluminium oxide and zirconic composite ceramics ring; In the present embodiment; The aperture of the mesopore that ceramic seal spare middle part forms is ￠ 6.0 ± 0.1mm, and thickness is 2.5 ± 0.1mm.The decay resistance of ceramic seal spare is very good, can not corroded by electrolyte, can guarantee the useful life of lithium ion battery; And impact strength, the thermal shock resistance of ceramic seal spare are superior to vitreum, make that the structure of cover plate assembly is more stable, and sealing effectiveness is better; What deserves to be mentioned is that adopt ceramic seal spare as the sealing-in medium, compared to adopting ceramic wafer, its thickness is thicker, thermal shock resistance and thermal circulation performance are better.
Cover plate assembly can also contain electrode connecting piece 4; Electrode terminal 2 passes through electrode connecting piece 4 and pole piece conducting, projected current, and electrode connecting piece 4 is provided with the installing hole of installing electrodes terminal; The size of installing hole and position the utility model be restriction not; Electrode terminal 2 according to installing designs, and the installation of electrode terminal 2 can be welded in this installing hole for second pole, 222 parts of it being extended ceramic seal spare 3, also can be that polar cap 21 parts with electrode terminal 2 are welded on (shown in accompanying drawing 8) in this installing hole; Installing hole can be also can not connecting of through electrode brace 4, designs according to the part of the electrode terminal 2 of its connection.Be generally and prevent short circuit, 4 of cover board body 1 and electrode connecting piece need insulation processing, for example can between them, put into sealing ring, and the sealing ring of the utility model is meant the seal member with sealing effectiveness, to the not restriction of its shape.Present embodiment specifically can be set in the lower end of ceramic seal spare for the sealing ring with the O type, and the lower end of ceramic seal spare is coated in the sealing ring, and sealing ring 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.
Step 2, the pole of electrode terminal is inserted in the mesopore of above-mentioned ceramic seal spare, mesopore is extended in the end, and the polar cap of electrode terminal welds with the end face of the connecting portion of ceramic seal spare mutually.In this step; The polar cap of metal adopts soldering processes or founding to weld mutually with the connecting portion of ceramic seal spare; Said soldering processes need use scaling powder to realize welding below metal mother metal fusing point; Founding then only needs through realizing metal and ceramic being connected behind the mother metal of deposite metal, and the step of founding and parameter also have been conventionally known to one of skill in the art.The scolder that soldering processes adopted can be the scolder that Al-Si alloy, Al-Mg alloy, Al-Si-Mg alloy etc. are used for welding ceramics and aluminium; Under preferable case; The scolder that soldering processes adopted is the Al-Si alloy, and wherein, the content of Si is 0-12wt%; The content of preferential Si makes welding effect better for the 5-8wt% surplus is Al; The temperature of soldering processes is 570-625 ℃, and atmosphere is vacuum or protective gas atmosphere, and said protective gas atmosphere is preferably nitrogen, argon gas, hydrogen and nitrogen mixture body atmosphere.After soldering, between polar cap and connecting portion, form the scaling powder layer, polar cap is connected through said scaling powder layer with connecting portion.Under preferable case, the temperature of said founding is 600-1300 ℃, and atmosphere is vacuum or inert gas atmosphere.
Step 3, above-mentioned preparation all-in-one-piece electrode terminal, ceramic seal spare put into the through hole of cover board body; The pole of electrode terminal and the sealing of ceramic seal spare pass the electrode hole of the mounting groove bottom of cover board body surface protrusion together; After with the connecting portion of ceramic seal spare and the welding of mounting groove bottom interior surface, cover plate assembly is processed integrative-structure, welding can be the physics welding method; The physics welding method is electric resistance welding, Laser Welding or ultrasonic bond; Be used to realize the welding between 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 prepare an electrode terminal on a cover board body, also can prepare the electrode terminal of 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 prepare, when electrode terminal is the positive electricity end period of the day from 11 p.m. to 1 a.m with reference to above-mentioned steps; Can adopt step 2,3 is merged welding together again after soon electrode terminal, ceramic seal spare, cover board body opsition dependent relation assemble earlier.For example when containing the electrode terminal of both positive and negative polarity; Can be earlier for example negative electrode terminal and ceramic seal spare are processed 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 the welding that step 3 is carried out negative electrode terminal, positive electrode terminal.
During the assembling entire lithium ion battery, for example: an end opening of housing is positioned over pole piece in the housing; And fluid injection in housing, the cover plate assembly that will be manufactured with two electrode terminals then is installed on this openend of housing, in this process; The periphery of cover plate assembly is welded with housing mutually, and the electrode lead-out tablet of cover plate assembly is connected with pole piece (specifically, the positive plate of pole piece is connected through the electrode lead-out tablet that is connected on anode ear and one of them electrode terminal; The negative plate of pole piece is connected through the electrode lead-out tablet 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; In the sealing space, contain pole piece and electrolyte, 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 two openends of housing respectively, in this process, the periphery of these two cover plate assemblies are welded with housing mutually; And first and electrode connecting piece welding with second pole of these two cover plate assemblies; Electrode connecting piece is connected with pole piece again, and (specifically, the positive plate of pole piece is connected with the electrode connecting piece that second pole of the cover plate assembly that the anode electrode terminal is arranged is connected through anode ear, and the negative plate of pole piece is connected with the electrode connecting piece that second pole of the cover plate assembly that the negative electrode terminal is arranged is connected through negative electrode lug; Concrete structure can pass through existing techniques in realizing); After the installation, form seal cavity between these two cover plate assemblies and the housing, in the sealing space, contain pole piece and electrolyte; 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 utility model adopts the electrode terminal with buffer structure; When electrode terminal and insulating sealer welding; Can well slow down the big stress that the different coefficient of expansion parts of different materials are produced when welding; Reduce its influence to cover plate assembly, the stress that has occurred when having solved the different materials welding that differs greatly especially causes ceramic seal spare to be prone to cracked problem, has improved reliability of products; The lithium battery of the preferred ceramic seal cover plate assembly of the utility model has long characteristics of ageing-resistant life-span simultaneously, and security performance is higher.The preferred through hole of the utility model contains the mounting groove on protrusion cover board body surface simultaneously; Electrode hole is contained in the mounting groove bottom, and wherein, the pole of electrode terminal passes above-mentioned electrode hole; Stress in the time of further solving the welding of insulating sealer and cover board body further improves cushioning effect.The electrode terminal of the utility model, cover plate assembly are prone to preparation.The cover plate assembly technology of preparation is simple, is prone to welding, and the yield of product is high, and good stability is for the 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 is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.The protection range of the utility model is confirmed by claims.
Claims (26)
1. an electrode terminal is characterized in that, comprises pole and is positioned at the polar cap of pole one end; Said polar cap inner surface is provided with buffer structure.
2. electrode terminal according to claim 1 is characterized in that said buffer structure and polar cap are structure as a whole.
3. electrode terminal according to claim 1 is characterized in that, said buffer structure is a support ring.
4. electrode terminal according to claim 3 is characterized in that the internal diameter of said support ring is more than or equal to the external diameter of polar cap.
5. electrode terminal according to claim 3 is characterized in that the external diameter of said support ring is less than the external diameter of polar cap.
6. electrode terminal according to claim 1 is characterized in that, said polar cap is the sheet metal of thickness 0.5-1.0mm.
7. electrode terminal according to claim 1 is characterized in that, said polar cap is that height is greater than pole height 1/4, less than the cylinder of pole height 1/2.
8. electrode terminal according to claim 7 is characterized in that, the outer face periphery of said polar cap contains first lead angle.
9. electrode terminal according to claim 1 is characterized in that, said pole comprises two sections, and one section that contacts with polar cap is first pole, and another section is second pole, and the external diameter of said second pole is less than first pole.
10. a cover plate assembly is characterized in that, comprises cover board body, insulating sealer and electrode terminal; Said electrode terminal is any described electrode terminal of claim 1-9;
Have the through hole that runs through cover board body on the said cover board body, the pole of said electrode terminal passes said through hole projected current;
Clamping insulating sealer insulated enclosure between said cover board body and electrode terminal;
Said buffer structure is between polar cap and insulating sealer.
11. cover plate assembly according to claim 10 is characterized in that, said through hole contains the mounting groove on protrusion cover board body surface, and electrode hole is contained in said mounting groove bottom, and the pole of said electrode terminal passes said electrode hole.
12. cover plate assembly according to claim 11 is characterized in that, the periphery edge of said electrode hole contains second lead angle.
13. cover plate assembly according to claim 10 is characterized in that, said insulating sealer is a ceramic seal spare, and said ceramic seal spare center is formed with mesopore, and the pole of said electrode terminal passes said mesopore.
14. cover plate assembly according to claim 13 is characterized in that, said ceramic seal spare comprises the connecting portion that the sealing that is arranged in the through hole and external diameter are connected with cover board body greater than sealing and buffer structure.
15. cover plate assembly according to claim 13; It is characterized in that; Said through hole contains the mounting groove on protrusion cover board body surface; Electrode hole is contained in said mounting groove bottom, said ceramic seal spare comprise the sealing that is arranged in the electrode hole and external diameter greater than sealing bottom mounting groove with cushion the connecting portion that structure is connected.
16. cover plate assembly according to claim 15 is characterized in that, said connecting portion is in through hole.
17. cover plate assembly according to claim 15; It is characterized in that; Be provided with the first metal solder layer between the inner surface of said connecting portion and mounting groove bottom, the said first metal solder layer is through form through the soldering welding after being metallized in the connecting portion surface again and between the inner surface of mounting groove bottom.
18. cover plate assembly according to claim 15 is characterized in that, also is provided with the transition metal ring between the inner surface of said connecting portion and mounting groove bottom.
19. according to claim 14 or 15 described cover plate assemblies; It is characterized in that; Be provided with the second metal solder layer between said buffer structure and the connecting portion outer face, the said second metal solder layer is through form through the soldering welding after being metallized in the connecting portion outer face again and between the buffer structure.
20. according to claim 14 or 15 described cover plate assemblies, it is characterized in that, also be provided with the transition metal ring plate between said buffer structure and the connecting portion outer face.
21. cover plate assembly according to claim 13; It is characterized in that said pole comprises two sections, one section that contacts with polar cap is first pole; Another section is second pole; The external diameter of said second pole is less than first pole, and said first pole is arranged in the mesopore of ceramic seal spare and second pole extends ceramic seal spare together.
22. cover plate assembly according to claim 21 is characterized in that, said cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the said electrode connecting piece, and said second pole is installed in the said installing hole.
23. cover plate assembly according to claim 11 is characterized in that, said cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the said electrode connecting piece, and said polar cap is installed in the said installing hole.
24. according to claim 22 or 23 described cover plate assemblies, it is characterized in that, be provided with sealing ring between said cover board body and electrode connecting piece.
25. cover plate assembly according to claim 11 is characterized in that, the number of said electrode terminal is a plurality of, has a plurality of through holes on the said cover board body.
26. 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 said cover plate assembly and pole piece conducting, it is characterized in that, said cover plate assembly is any described cover plate assembly of claim 10-25.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201702101U CN202616327U (en) | 2012-04-20 | 2012-04-20 | Electrode terminal, cover plate component and battery containing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201702101U CN202616327U (en) | 2012-04-20 | 2012-04-20 | Electrode terminal, cover plate component and battery containing same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202616327U true CN202616327U (en) | 2012-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201702101U Expired - Lifetime CN202616327U (en) | 2012-04-20 | 2012-04-20 | Electrode terminal, cover plate component and battery containing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202616327U (en) |
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| CN103378343A (en) * | 2012-04-20 | 2013-10-30 | 比亚迪股份有限公司 | Electrode terminal, cover plate component and battery with cover plate component |
| CN103441224A (en) * | 2013-09-02 | 2013-12-11 | 广州力柏电动科技有限公司 | Ceramic sealed battery |
| CN105810877A (en) * | 2013-12-31 | 2016-07-27 | 比亚迪股份有限公司 | Leading-out terminal, battery cover plate assembly with same, battery and battery pack |
| CN106848172A (en) * | 2015-10-27 | 2017-06-13 | 丰田自动车株式会社 | Battery and the manufacture method for battery |
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| CN103378343A (en) * | 2012-04-20 | 2013-10-30 | 比亚迪股份有限公司 | Electrode terminal, cover plate component and battery with cover plate component |
| CN103441224A (en) * | 2013-09-02 | 2013-12-11 | 广州力柏电动科技有限公司 | Ceramic sealed battery |
| CN105810877A (en) * | 2013-12-31 | 2016-07-27 | 比亚迪股份有限公司 | Leading-out terminal, battery cover plate assembly with same, battery and battery pack |
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| CN113725531A (en) * | 2017-11-03 | 2021-11-30 | 宁德时代新能源科技股份有限公司 | Power battery top cover component, power battery and battery module |
| CN113725531B (en) * | 2017-11-03 | 2023-11-03 | 宁德时代新能源科技股份有限公司 | Top cover assembly of power battery, power battery and battery module |
| CN107749351A (en) * | 2017-11-20 | 2018-03-02 | 上海奥威科技开发有限公司 | Hermetically sealed ultracapacitor and its manufacture method |
| WO2021208317A1 (en) * | 2020-04-17 | 2021-10-21 | 宁德时代新能源科技股份有限公司 | End cap assembly, battery cell, battery module, and apparatus |
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| JP7259063B2 (en) | 2020-04-17 | 2023-04-17 | 寧徳時代新能源科技股▲分▼有限公司 | End cover assemblies, battery cells, battery modules and devices |
| JP2023085474A (en) * | 2020-04-17 | 2023-06-20 | 寧徳時代新能源科技股▲分▼有限公司 | End cover assembly, battery cell, battery module, and device |
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| CN112331973A (en) * | 2020-04-17 | 2021-02-05 | 宁德时代新能源科技股份有限公司 | End cover assembly, battery monomer, battery module and device |
| JP7417777B2 (en) | 2020-04-17 | 2024-01-18 | 寧徳時代新能源科技股▲分▼有限公司 | End cover assemblies, battery cells, battery modules and devices |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20121219 Effective date of abandoning: 20170405 |