CN103378343A - Electrode terminal, cover plate component and battery with cover plate component - Google Patents
Electrode terminal, cover plate component and battery with cover plate component Download PDFInfo
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- CN103378343A CN103378343A CN2012101177048A CN201210117704A CN103378343A CN 103378343 A CN103378343 A CN 103378343A CN 2012101177048 A CN2012101177048 A CN 2012101177048A CN 201210117704 A CN201210117704 A CN 201210117704A CN 103378343 A CN103378343 A CN 103378343A
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides an electrode terminal, a cover plate component and a battery with the cover plate component. The electrode terminal comprises an electrode pole and an electrode cap 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, which is in contact with the electrode pole, of the electrode cap. When the electrode terminal is welded with an insulating sealing piece, large stress generated during welding of components of different materials with different expansion coefficients can be buffered so as to reduce the impact of the components on the cover plate, so that the problem of easiness of crazing of a ceramic sealing piece, which is caused by stress generated during welding of different materials with large difference, is solved, and the reliability of the product is improved, and the electrode terminal and the cover plate component are easy to prepare. The prepared cover plate component 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 present invention relates to a kind of electrode terminal, 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, but because the difficult welding of pottery and frangiblely easily split, present application only is confined to the application of ceramic gasket, and what all also need other routines is used for sealing between cover plate and the electrode terminal such as plastic cement seal member etc.When the ceramic seal spare insulated enclosure of clamping between cover plate and the electrode terminal, because the difference of material, producing larger stress during welding makes the frangible ceramic seal spare that easily splits cracked, unreliability, the uncontrollability of product have been increased, the security performance of lithium battery is reduced, technology difficulty increases simultaneously, and 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 welding of pottery as seal in order to solve, and fraction defective is high, and affects the technical problem of the security performance of battery.A kind of easy preparation is provided, easier large-scale production, and when preparation ceramic seal spare not easily broken, yield is high, the cover plate assembly that security performance is high and prepare the electrode terminal of this cover plate assembly and and contain the battery of this cover plate assembly.
First order of the present invention 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, inner surface of the present invention refers to the outer drain surface of the one side that polar cap contacts with pole.
Preferably, buffer structure is 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 the first pole, and another section is the second pole, and wherein, the external diameter of the second pole is less than the first pole.
Second order of the present invention 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 described through hole extracted 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 that protrudes the 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 upper surface that battery leaks outside also can refer to be positioned at the lower surface of battery container inside.
Further preferred, the periphery edge of electrode hole contains the second lead angle.
Preferably, the edge seal is 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 that the sealing that is arranged in the through hole is connected the connecting portion that sealing and buffer structure be connected with cover board body with external diameter.
Perhaps preferred, through hole contains the mounting groove that protrudes the cover board body surface, and electrode hole is contained in the mounting groove bottom, and ceramic seal spare comprises that the sealing that is arranged in the electrode hole is connected the connecting portion that sealing is connected with buffer structure with external diameter bottom mounting groove.
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 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 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 forms by 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 the first pole, and another section is the second pole, and the external diameter of the second pole is less than the first pole, and the first pole is arranged in the mesopore of ceramic seal spare, and the 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, the 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 described cover board body.
The 3rd order of the present invention 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 described cover plate assembly and pole piece conducting, it is characterized in that, described cover plate assembly is above-mentioned cover plate assembly.
The present invention adopts the electrode terminal with buffer structure, when electrode terminal and insulating sealer welding, can well slow down the larger stress that the different coefficient of expansion parts of different materials produce when welding, reduce it to the impact of cover plate assembly, solve especially stress that different materials when welding of differing greatly occur and caused easily cracked problem of ceramic seal spare, improved the reliability of product, the lithium battery of the preferred ceramic seal cover plate assembly of simultaneously the present invention has long characteristics of ageing-resistant life-span, and security performance is higher.The preferred through hole of simultaneously the present invention contains the mounting groove that protrudes the cover board body surface, electrode hole is contained in the mounting groove bottom, and wherein, the pole of electrode terminal passes above-mentioned electrode hole, effect of stress in the time of further solving the welding of insulating sealer and cover board body further improves cushioning effect.Electrode terminal of the present invention, cover plate assembly easily prepare.The cover plate assembly technique of preparation is simple, easily welding, and the yield of product is high, and good stability 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 perspective view of a kind of electrode terminal of the present invention.
Fig. 2 is the cross-sectional view of the electrode terminal of embodiments of the invention.
Fig. 3 is the perspective view of the electrode terminal of embodiments of the invention.
Fig. 4 is the cross-sectional view of the cover plate assembly of embodiments of the invention.
Fig. 5 is the cross-sectional view of the cover board body of embodiments of the invention.
Fig. 6 is the local structure for amplifying schematic diagram of through hole on the cover board body of embodiments of the invention.
Fig. 7 is the perspective view of the ceramic seal spare of embodiments of the invention.
Fig. 8 is the battery cross-sectional view 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 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 present invention of electrode terminal 2 designs according to the size of extracted current without limits.Electrode terminal 2 is generally the metallic conduction parts of connecting tab, can be directly and the tab welding that arranges on the pole piece realize conducting with pole piece, also can be by connecting brace, brace again with pole piece on the realization such as the tab welding that arranges and pole piece conduct.
Electrode terminal 2 of the present invention comprises pole 22 and is positioned at the polar cap 21 of pole one end.Polar cap 21 and pole 22 can be one-body molded, also can be rear welding or cold-heading assemblings.Material the present invention of polar cap 21 and pole 22 can adopt conventional material without limits, 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 present invention of polar cap 21 and pole 22 without limits, only being required to be mutual cross-coupled two parts gets final product, be generally vertical connection, for example can be connected connection with rectangle sheet polar cap for orthogonal rectangle sheet pole, assemble according to actual conditions, electrode terminal 2 can be regarded down " T " font as in the placement figure of present embodiment.Present embodiment specifically is 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 large I of through hole 11, electrode hole 1111, mesopore 33 is determined according to the diameter of pole 22.Shape the present invention 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 shown in accompanying drawing 2,3, also can be thinner circular metal plate etc., and thickness can be 0.8mm, and external diameter is greater than pole, as shown in Figure 1.The present invention without limits.
Improvements of the present invention are that polar cap 21 inner surfaces are provided with buffer structure.In accompanying drawing 1,2,3, namely the lower surface of polar cap 21 is provided with buffer structure, can slow down the stress between different materials when electrode terminal and insulating sealer welding, reduces to weld the impact on cover plate assembly.Buffer structure the present invention without limits, general need be played buffering effect and get final product, general needs that a support component is set and gets 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 are without limits, also can be at the one-body molded honeycomb metallic object with buffering effect of polar cap lower surface, the honeycomb metallic object can be sheet etc.The present invention is preferably support ring 211, namely make the ring-type support rim at the lower surface of polar cap, shape the present invention of support ring 211 also without limits, only being required to be ring bodies gets final product, for example can be annulus, also can be square ring, hexahedron ring etc., external diameter the present invention of ring-type support rim without limits, can be greater than the external diameter of polar cap, also can be less than the external diameter of polar cap, the internal diameter of support ring 211 of the present invention can be more than or equal to the external diameter of polar cap 21, then contains between general polar cap 21 and the supporting ring 211 this moment to be provided with the part connecting surface.The external diameter of support ring 211 also can be less than the external diameter of polar cap 21, the ring-type support rim can combine with the pole 22 of polar cap 21 lower surfaces, namely is coated on part pole surface, also can be not and pole 22 combinations, its internal diameter is greater than pole 22 external diameters, and there is certain gap in 22 of poles.The ring thickness of supporting ring 211 also without limits, 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, makes this structure when making polar cap 21, buffer structure is welded on polar cap 21 lower surfaces after also can being.
The present invention also can process the outer face of polar cap 21, for example contains the first lead angle 212 at the outer face of polar cap periphery.Be convenient to be connected with external loading or be connected with electrode connecting piece, weld in the easier installing hole that is fit into electrode connecting piece, simultaneously as also can prevent the solder diffusing for soldering processes, concentrated solder is at the soldering opening place.
Cover board body 1 is used for the sealing-in battery container, as shown in Figure 5, generally be provided with the through hole 11 that runs through cover board body 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 2 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 2 that is used for an a kind of polarity, at this moment, the electrode terminal 2 of another polarity for example lug can be connected extracted 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 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 only have a kind of polarity, but also electrode terminal 2 and 1 equal insulation processing of cover board body.
Shape the present invention of through hole 11 without limits, 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 is positioned at wherein in whole or in part, and the present invention without limits.As shown in Figure 6, the concrete preferred through hole 11 of present embodiment contains the mounting groove 111 that protrudes cover board body 1 surface, the surface of cover board body 1 can refer to that upper surface that battery leaks outside also can refer to be positioned at the lower surface of battery container inside, installation relation according to electrode terminal 2 designs, for example the polar cap 21 when electrode terminal 2 is positioned at battery container outward for being connected with load, when the second pole 222 is positioned at battery container and is used for being connected with pole piece, mounting groove 111 can be positioned at enclosure interior, and namely the lower surface of cover board body 1 is protruding with mounting groove 111; When being positioned at, the 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 namely 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 rear welding, mounting groove 111 annexations own are preferably smooth transition and connect, for example without 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 without obvious turning.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, guarantees the good sealing property of cover plate assembly of the present invention.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 present invention of electrode hole 1111 without limits, for example can design according to the number of electrode terminal 2, for example can a large through hole 11 be set at cover board body, only outstanding large mounting groove 111 on this large through hole 11, at the electrode hole 1111 of mounting groove bottom setting with extraction electrode terminal 2 equal numbers, then each electrode terminal 2 passes electrode hole 1111 extracted currents, 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 only has an electrode hole 1111, and perhaps electrode hole 1111 numbers of each mounting groove bottom are also different in a plurality of mounting grooves 111.Shown in Fig. 6,7, preferred, the periphery edge of electrode hole 1111 contains the second lead angle 1112, is convenient to penetrating, passing of ceramic seal spare and electrode terminal, and technique is simple to operation.
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 2.0mm.Material the present invention of cover board body also without limits, such as being 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 present invention without limits, for example can be moulding, as shown in Figure 7, the present invention 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, the external diameter that can be a bit larger tham pole 22, so that form the gap between mesopore 33 and the pole 22, to avoid ceramic seal spare 3 expanded by heating, less than the external diameter of polar cap 21, thereby guarantee to wear pole 22, polar cap 21 is connected on the ceramic seal spare 3, has good sealing thereby make between ceramic seal spare 3 and the electrode terminal 2.
Ceramic seal spare 3 comprises that sealing 31 and external diameter are greater than the connecting portion 32 of 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, is connected with cover board body with buffer structure respectively and is connected in two surfaces.In the present embodiment, through hole 11 contains the mounting groove 111 that protrudes cover board body 1 surface, the sealing 31 of ceramic seal spare 3 can be arranged in the electrode hole 1111, two surfaces of connecting portion 32 can be connected with buffer structure with the mounting groove bottom interior surface respectively, connecting portion is in mounting groove 111, namely be fastened on mounting groove 111 inside, easier welding connects more firm, wherein, connecting portion 32 can all be positioned at through hole 11, namely highly is lower than cover board body 1 thickness, also can partly be positioned at through hole 11, namely highly be higher than cover board body 1 thickness, perhaps identical with cover board body 1 thickness, the present invention without limits, 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 section 31 of electrode hole 1111 less than the external diameter of connecting portion 32, makes cover plate assembly have good sealing.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, such as adopting metal promoted solder flux etc., for example be specifically as follows between the inner surface of connecting portion 32 and mounting groove bottom 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 connecting portion 32 surfaces, 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 32 and mounting groove bottom 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 metal material that the transition metal ring plate can adopt common various easy aluminum or aluminum alloy to weld is such as adopting 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 present invention does not have particular determination.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 mounting groove 111 and the ceramic seal spare 3, 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.
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, such as adopting welding material of metal etc., for example be specifically as follows and be provided with the second metal solder layer (not shown) between buffer structure and connecting portion 32 outer faces, the second metal solder layer forms by Welding after being metallized in connecting portion 32 outer faces again and between the buffer structure.Wherein, the first metal solder layer forms by 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 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 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 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, 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 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 the polar cap 21 of electrode terminal and the ceramic seal spare 3, 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 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, 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 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 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 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 is by electrode connecting piece 4 and pole piece conducting, extracted current, electrode connecting piece 4 is provided with the installing hole of installing electrodes terminal, the size of installing hole and position the present invention are without limits, design according to the electrode terminal 2 of installing, the installation of electrode terminal 2 can be welded in this installing hole for the 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 (as shown in Figure 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 put into sealing ring between them, and sealing ring of the present invention refers to have the seal member of sealing effectiveness, to its shape without limits.Present embodiment is specifically as follows the lower end that the sealing ring of O type is set in ceramic seal spare, 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 mutually with the end face of the connecting portion of ceramic seal spare.In this step, the polar cap of metal adopts soldering processes or founding to weld mutually with the connecting portion of ceramic seal spare, described soldering processes need to use scaling powder to realize welding below metal mother metal fusing point, founding then only needs by realizing liquid-solid interface 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 adopt can be the scolder that Al-Si alloy, Al-Mg alloy, Al-Si-Mg alloy etc. are used for welding ceramics and aluminium, in the preferred case, the scolder that soldering processes adopt is the Al-Si alloy, wherein, the content of Si is 0-12wt%, the content of preferential Si is that the 5-8wt% surplus is Al, so that welding effect is better; The temperature of soldering processes is 570-625 ℃, and atmosphere is vacuum or protective gas atmosphere, and described 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 by described scaling powder layer with connecting portion.In the preferred case, the temperature of described founding is 600-1300 ℃, and atmosphere is vacuum or inert gas atmosphere.
Step 3, with above-mentioned preparation all-in-one-piece electrode terminal, ceramic seal spare is 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 protruding on the cover board body surface together, after with the connecting portion of ceramic seal spare and the welding of mounting groove bottom interior surface, cover plate assembly is made integrative-structure, 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, electric resistance welding, the processing step of 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 the welding that step 3 is carried out negative electrode terminal, positive electrode terminal.
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 first and electrode connecting piece welding with the second pole of these two cover plate assemblies, electrode connecting piece is connected (specifically with pole piece again, the positive plate of pole piece is connected with the electrode connecting piece that the second pole of the cover plate assembly that the anode electrode terminal is arranged is connected by anode ear, the negative plate of pole piece is connected with the electrode connecting piece that the second pole of the cover plate assembly that the negative electrode terminal is arranged is connected by 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 present invention adopts the electrode terminal with buffer structure, when electrode terminal and insulating sealer welding, can well slow down the larger stress that the different coefficient of expansion parts of different materials produce when welding, reduce it to the impact of cover plate assembly, solve especially stress that different materials when welding of differing greatly occur and caused easily cracked problem of ceramic seal spare, improved the reliability of product, the lithium battery of the preferred ceramic seal cover plate assembly of simultaneously the present invention has long characteristics of ageing-resistant life-span, and security performance is higher.The preferred through hole of simultaneously the present invention contains the mounting groove that protrudes the cover board body surface, electrode hole is contained in the mounting groove bottom, and wherein, the pole of electrode terminal passes above-mentioned electrode hole, effect of stress in the time of further solving the welding of insulating sealer and cover board body further improves cushioning effect.Electrode terminal of the present invention, cover plate assembly easily prepare.The cover plate assembly technique of preparation is simple, easily welding, and the yield of product is high, and good stability is 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 (26)
1. an electrode terminal is characterized in that, comprises pole and is positioned at the polar cap of pole one end; Described polar cap inner surface is provided with buffer structure.
2. electrode terminal according to claim 1 is characterized in that, described buffer structure and polar cap are structure as a whole.
3. electrode terminal according to claim 1 is characterized in that, described buffer structure is support ring.
4. electrode terminal according to claim 3 is characterized in that, the internal diameter of described 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 described support ring is less than the external diameter of polar cap.
6. electrode terminal according to claim 1 is characterized in that, described polar cap is the sheet metal of thickness 0.5-1.0mm.
7. electrode terminal according to claim 1 is characterized in that, described 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 described polar cap contains the first lead angle.
9. electrode terminal according to claim 1 is characterized in that, described pole comprises two sections, and one section that contacts with polar cap is the first pole, and another section is the second pole, and the external diameter of described the second pole is less than the first pole.
10. a cover plate assembly is characterized in that, comprises cover board body, insulating sealer and electrode terminal; Described electrode terminal is the described electrode terminal of claim 1-9 any one;
Have the through hole that runs through cover board body on the described cover board body, the pole of described electrode terminal passes described through hole extracted current;
Clamping insulating sealer insulated enclosure between described cover board body and electrode terminal;
Described buffer structure is between polar cap and insulating sealer.
11. cover plate assembly according to claim 10 is characterized in that, described through hole contains the mounting groove that protrudes the cover board body surface, and electrode hole is contained in described mounting groove bottom, and the pole of described electrode terminal passes described electrode hole.
12. cover plate assembly according to claim 11 is characterized in that, the periphery edge of described electrode hole contains the second lead angle.
13. cover plate assembly according to claim 10 is characterized in that, described insulating sealer is ceramic seal spare, and described ceramic seal spare center is formed with mesopore, and the pole of described electrode terminal passes described mesopore.
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 through hole is connected the connecting portion that sealing and buffer structure be connected with cover board body with external diameter.
15. cover plate assembly according to claim 13, it is characterized in that, described through hole contains the mounting groove that protrudes the cover board body surface, electrode hole is contained in described mounting groove bottom, and 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 buffer structure with external diameter bottom mounting groove.
16. cover plate assembly according to claim 15 is characterized in that, described 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 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.
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 described 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 described buffer structure 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 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 described buffer structure and the connecting portion outer face.
21. cover plate assembly according to claim 13, it is characterized in that, described pole comprises two sections, one section that contacts with polar cap is the first pole, another section is the second pole, the external diameter of described the second pole is less than the first pole, and described the first pole is arranged in the mesopore of ceramic seal spare, and the second pole extends ceramic seal spare together.
22. cover plate assembly according to claim 21 is characterized in that, described cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the described electrode connecting piece, and described the second pole is installed in the described installing hole.
23. cover plate assembly according to claim 11 is characterized in that, described cover plate assembly also comprises electrode connecting piece, has the installing hole of installing electrodes terminal on the described electrode connecting piece, and described polar cap is installed in the described installing hole.
24. according to claim 22 or 23 described cover plate assemblies, it is characterized in that, be provided with sealing ring between described cover board body and electrode connecting piece.
25. cover plate assembly according to claim 11 is characterized in that, the number of described electrode terminal is a plurality of, has a plurality of through holes on the described 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 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 10-25 any one.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117704.8A CN103378343B (en) | 2012-04-20 | 2012-04-20 | A kind of electrode terminal, cover plate assembly and the battery containing the cover plate assembly |
| PCT/CN2012/077670 WO2013000415A1 (en) | 2011-06-28 | 2012-06-27 | Electrode terminal, cover assembly and battery comprising the cover assembly |
| JP2014517424A JP5941143B2 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the cover assembly |
| KR1020147002229A KR101589838B1 (en) | 2011-06-28 | 2012-06-27 | Electrode terminal, cover assembly and battery comprising the cover assembly |
| EP12803624.1A EP2727174B1 (en) | 2011-06-28 | 2012-06-27 | Electrode terminal, cover assembly and battery comprising the cover assembly |
| US14/134,984 US10109839B2 (en) | 2011-06-28 | 2013-12-19 | Electrode terminal, cover assembly and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117704.8A CN103378343B (en) | 2012-04-20 | 2012-04-20 | A kind of electrode terminal, cover plate assembly and the battery containing the cover plate assembly |
Publications (2)
| Publication Number | Publication Date |
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| CN103378343A true CN103378343A (en) | 2013-10-30 |
| CN103378343B CN103378343B (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210117704.8A Active CN103378343B (en) | 2011-06-28 | 2012-04-20 | A kind of electrode terminal, cover plate assembly and the battery containing the cover plate assembly |
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| CN108428819A (en) * | 2017-02-14 | 2018-08-21 | 宁德时代新能源科技股份有限公司 | Top cover structure of power battery |
| CN110752324A (en) * | 2019-10-28 | 2020-02-04 | 惠州亿纬锂能股份有限公司 | Sealing assembly and lithium ion battery |
| CN113991229A (en) * | 2021-10-25 | 2022-01-28 | 芜湖天弋能源科技有限公司 | Lithium battery pack and assembling device thereof |
| WO2023206246A1 (en) * | 2022-04-28 | 2023-11-02 | 宁德新能源科技有限公司 | Electrochemical apparatus and electronic device |
| WO2023220883A1 (en) * | 2022-05-16 | 2023-11-23 | 宁德时代新能源科技股份有限公司 | End cover, battery cell, battery, and electric device |
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