CN103378321B - A kind of cover plate assembly and the battery containing this cover plate assembly - Google Patents
A kind of cover plate assembly and the battery containing this cover plate assembly Download PDFInfo
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- CN103378321B CN103378321B CN201210117690.XA CN201210117690A CN103378321B CN 103378321 B CN103378321 B CN 103378321B CN 201210117690 A CN201210117690 A CN 201210117690A CN 103378321 B CN103378321 B CN 103378321B
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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 invention provides a kind of cover plate assembly and the battery containing this cover plate assembly, cover plate assembly comprises cover board body, cover board connecting component and electrode terminal; Cover board connecting component has the electrode hole running through cover board connecting component, electrode terminal is through insulated enclosure between electrode hole and cover board connecting component; Cover board body has the through hole running through cover board body, electrode terminal is through described through hole extracted current; Cover board connecting component and cover board body are tightly connected.Technical scheme of the present invention can be enhanced productivity, and reduce cost of manufacture, particularly yield is high, and security performance is good, and simultaneously cover plate assembly anatomical connectivity of the present invention is firm, good seal performance, for the practical application of the battery of ceramic seal and development are laid a good foundation.
Description
Technical field
The present invention relates to a kind of cover plate assembly and the battery containing 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, capacity is high, have extended cycle life.The fields such as current lithium-ion-power cell, lithium ion tool batteries, the network energy.Lithium ion battery is by positive plate, barrier film, negative plate winding or after being stacked to pole piece, pole piece is put into the cavity of battery container and seal cover board formation, 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 the space size etc. taken in battery have very significance, cover plate assembly takies the certain cost of whole lithium battery in addition, provides its production efficiency, rate of finished products largely to reduce costs.
At present, lithium ion battery mainly adopts plastics injection moulding to reach sealing and insulation, cover plate main body is all carrying out injection moulding with positive pole exit, negative pole exit and combining of integral type, so not only cause moulding volume large, occur during injection moulding that being difficult to reach each position injection moulding seals to obtain the problem that consistency is fine, fraction defective is high, production efficiency is also low, and metalwork needs through certain temperature during injection moulding, easily cause metalwork oxidized and contaminated, integral cap plate material changes the problems such as deliquescing.In addition, use injection molding plastic material to play sealed insulation effect, plastics ageing-resistant performance is not high, compactness is low, and is combustible material, and useful life is shorter, and security performance is lower.
Also research is had pottery to be used for the insulated enclosure of cover plate as seal at present, cover plate is welded with pottery, positive pole draws post, negative pole is drawn post and is welded with pottery, by cover plate insulated enclosure, but cover plate is higher with the welding temperature of pottery, larger on cover plate materials impact, easily there is deliquescing in cover plate, intensity reduces, the problems such as production efficiency is low, and cover plate is larger portion part, cover plate exists various installing component, larger impact is there is in the distortion of cover plate on the performance of cover plate, particularly affect follow-up being tightly connected with battery container, the technology difficulty preparing the cover plate assembly mated with battery container increases, battery fraction defective increases, have impact on its actual application and development.
Summary of the invention
The present invention is in order to solve the cover plate assembly difficulty preparation of existing pottery as seal, the technical problem that fraction defective is high.Provide a kind of easily preparation, easier large-scale production, and not deformation during preparation, yield is high, the cover plate assembly more easily mated with battery container and the battery containing this cover plate assembly.
First object of the present invention is to provide a kind of cover plate assembly, comprises cover board body, cover board connecting component and electrode terminal; Cover board connecting component has the electrode hole running through cover board connecting component, electrode terminal is through insulated enclosure between electrode hole and cover board connecting component; Cover board body has the through hole running through cover board body, electrode terminal is through described through hole extracted current; Cover board connecting component and cover board body are tightly connected.
Preferably, cover board connecting component is arranged in above-mentioned through hole.
Preferably, cover board connecting component comprises a mounting groove, and above-mentioned electrode hole runs through bottom mounting groove.
Preferably, mounting groove prolongs periphery and comprise turnup structure, turnup structure is connected with cover board body.
Further preferably, through hole is stepped hole, and the step that turnup structure is positioned at stepped hole is connected with cover plate.
Preferably, the connection bottom the cell wall of mounting groove and mounting groove connects for smoothly transitting, and the cell wall of mounting groove is connected with turnup structure and connects for smoothly transitting.Smoothly transit the various connections connecting and be known to the skilled person, and such as arc connects.Bottom the cell wall of mounting groove, mounting groove and turnup structure can be formed in one.
Preferably, ceramic seal insulated enclosure is clamped between electrode terminal and cover board connecting component.
Preferably, ceramic seal center is formed with mesopore, and electrode terminal is through above-mentioned mesopore.
Preferably, ceramic seal comprises and is arranged in sealing in electrode hole and external diameter and is greater than the connecting portion that sealing is connected with cover board connecting component.
Preferably, cover board connecting component comprises a mounting groove, and connecting portion is in mounting groove.
Preferably, be provided with the first metallic solder layer between the inner surface bottom connecting portion and mounting groove, the first metallic solder layer is by being formed by Welding between the inner surface after metallizing to connecting portion surface again and bottom mounting groove.
Or be also provided with transition metal ring plate between the inner surface preferably, bottom connecting portion and mounting groove.
Preferably, electrode terminal comprises pole and polar cap, and wherein, the two ends of pole are first end and the second end, and polar cap is positioned at the first end of pole; Pole is arranged in the mesopore of ceramic seal, and the second end extends ceramic seal.
Preferably, ceramic seal comprises and is arranged in sealing in electrode hole and external diameter and is greater than the connecting portion that sealing is connected with cover board connecting component; Polar cap is connected with connecting portion outer face.
Further preferably, be provided with the second metallic solder layer between polar cap and connecting portion outer face, the second metallic solder layer is formed by Welding again and between polar cap after metallizing to connecting portion outer face.
Or preferred further, be also provided with transition metal ring plate between polar cap and connecting portion outer face.
Preferably, transition metal ring plate is kovar alloy sheet.The transition metal ring plate be provided with between inner surface bottom connecting portion and mounting groove can be aluminium, aluminium alloy, kovar alloy or stainless steel substrates; The transition metal ring plate be provided with between polar cap and connecting portion outer face can be aluminium, aluminium alloy or kovar alloy sheet when electrode terminal is positive pole, can be copper, copper alloy or kovar alloy sheet when electrode terminal is negative pole.
Preferably, polar cap inner surface is also provided with buffer structure, is positioned between polar cap and connecting portion outer face.
Preferably, buffer structure is support ring.
Preferably, the second end extending the pole of ceramic seal is also connected with electrode connecting piece.
Further preferably, sealing ring is provided with between cover board connecting component and electrode connecting piece.
Preferably, the number of electrode terminal is multiple, cover board connecting component has multiple electrode hole.
Preferably, the number of electrode terminal is multiple, and the number of described cover board connecting component is multiple.
Another order of the present invention is to provide a kind of battery, comprising: cover plate assembly, battery container, pole piece and electrolyte, and pole piece and electrolyte level are in battery container, and cover plate assembly and battery container are tightly connected; Inside battery electric current is drawn in electrode terminal on described cover plate assembly and pole piece conducting, and described cover plate assembly is above-mentioned cover plate assembly.
After the present invention adopts and is first connected with cover board connecting component insulated enclosure by electrode terminal, be connected with cover board body by cover board connecting component again, because cover board connecting component can adopt less structure, this less structure is not yielding under the hot conditionss such as welding, easy cleaning, particularly for the present invention's preferably ceramic seal structure, when with ceramic seal high-temperature soldering, not yielding, and it is also capable of washing after sintering, conveniently be easy to get, again cover board connecting component is welded with cover board body, performance is more excellent, the Main Function of cover board connecting component is by ceramic seal, electrode terminal and cover board body are sealedly connected, therefore its shape is not also specially required, volume is little, amorphism particular/special requirement and special parts, high temperature can be experienced, high temperature distortion itself is also little, the sealing of battery can not be affected, the cover board connecting component of material the same as cover board body is welded with cover board body, easy realization, and on the intensity of cover board body etc. without impact, technical scheme of the present invention can be enhanced productivity, reduce cost of manufacture, particularly yield is high, security performance is good, cover plate assembly anatomical connectivity of the present invention is firm simultaneously, good seal performance, for the practical application of the battery of ceramic seal and development are laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the electrode terminal of embodiments of the invention, seal, cover board connecting component assembling.
Fig. 2 is the cross-sectional view of the cover plate assembly of embodiments of the invention.
Fig. 3 be embodiments of the invention be connected with the cross-sectional view that electrode connects the cover plate assembly of pole piece.
Fig. 4 is the perspective view of the cover board connecting component of embodiments of the invention.
Fig. 5 is the perspective view of the electrode terminal of embodiments of the invention.
Fig. 6 is the perspective view of the ceramic seal of embodiments of the invention.
Fig. 7 is the cross-sectional view of the cover board body of embodiments of the invention.
Fig. 8 is the plan structure schematic diagram of the cover board body of embodiments of the invention.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearly understand, 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, be not intended to limit the present invention.
Embodiment
With reference to the accompanying drawings the specific embodiment of the present invention is described in detail.Herein, same reference numerals represents same composition part.And, should be appreciated that in describing the invention, " on ", the relative bearing term such as D score, represent each parts in cover plate assembly and the relative position of part in the cutaway view of the cover plate assembly shown in Fig. 1 thereof, so that be described each parts and part thereof; But and be not used in actual installation in lithium ion battery of these parts and part thereof and position relationship limited, it may be not identical with 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, more for the sealing of lithium ion battery, especially high-power lithium ion battery, such as: 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, the electrolyte being positioned over the pole piece in housing and being contained in housing.In order to avoid spilling of electrolyte, the openend of cover plate assembly to housing is adopted to seal.Wherein, housing is generally aluminum hull or box hat, for placing pole piece and holding electrolyte, opening can be an i.e. one end open, from battery one end extracted current, also can be two, i.e. both ends open, from the two ends extracted current of battery, the position of opening does not also limit, can from minor face opening, pole piece directly vertically puts into battery container, and namely opening exposed portion is the pole piece end of extracted current, also can from long limit opening, the direct level of pole piece puts into battery container, and namely opening exposed portion is the winding arc-shaped edges of winding pole piece.Described pole piece is formed by positive plate, barrier film, negative plate successively stacked or winding, and the structure of pole piece and manufacture method, by existing techniques in realizing, do not repeat at this.
The present embodiment specifically describes cover plate assembly, and as shown in Figure 1, cover plate assembly comprises cover board body 1, cover board connecting component 2 and electrode terminal 3.
As accompanying drawing 2, 7, shown in 8, cover board body 1 is for sealing-in battery container, cover board body 1 is generally provided with the through hole 11 running through cover board body 1, for drawing inside battery electric current, number the present invention of through hole 11 does not limit, can design according to the number of the electrode terminal 3 for extracted current of design, such as when battery is one end extracted current, cover board body 1 can contain a through hole 11, for the passing of electrode terminal 3 of an a kind of polarity, now, the electrode terminal 3 such as lug of another polarity can be connected extracted current with housing, now generally generally need insulation processing through the electrode terminal 3 of cover board body 1.Cover board body 1 also can contain multiple through hole 11, for the passing or the passing of electrode terminal 3 of multiple different pole piece of electrode terminal 3 of multiple same polarity, when the passing of the electrode terminal 3 for multiple different pole piece, a kind of electrode terminal 3 of pole piece and cover board body 1 insulation processing can be only had, also can equal insulation processing between electrode terminal 3 and cover board body 1.Shape the present invention of through hole 11 does not limit, and only needs to pass electrode terminal 3, such as can for running through the cylinder of cover board body 1, and diameter is a bit larger tham electrode terminal 3, and the present embodiment is specifically preferably stepped hole, installs cover board connecting component 2 for engaging.Number the present invention of cover board body 1 does not limit, opening number according to battery container designs, and shape the present invention of cover board body 1 does not also limit, and the shape according to the opening of battery container designs, coordinating housing, such as, can be that circle also can for square.Size such as thickness can be 1.5mm or 2.0mm.Material the present invention of cover board body 1 does not also limit, such as, can be selected from aluminium alloy 3003, fine aluminium etc.On cover board body 1 other structure example as liquid injection port etc. with manufacture method by existing techniques in realizing, do not repeat at this.
As shown in accompanying drawing 1,2,3,4, cover board connecting component 2 has the electrode hole 21 running through cover board connecting component 2, electrode terminal 3 is through insulated enclosure between electrode hole 21 and cover board connecting component 2.Cover board connecting component 2 is for being tightly connected with cover board body 1, the present embodiment is mainly and ceramic seal 4, electrode terminal 3 is sealedly connected with cover board body 1, after first electrode terminal 3, ceramic seal 4, cover board connecting component 2 being made integrative-structure, again cover board connecting component 2 is welded with cover board body 1, realize the insulated enclosure of cover plate assembly.Cover board connecting component 2 generally adopts less parts, the shape of cover board connecting component 2, structure and position the present invention are not limited, such as can at the upper surface of cover board body 1 or lower surface etc., adopt bow-shaped structural etc., by being made of one the electrode terminal 3 of structure, ceramic seal 4, cover board connecting component 2 be connected with cover board body 1, and now general electrode terminal 3 is also clamped with insulating sealer through between electrode terminal 3 during through hole 11 on cover board body 1 and cover board body 1.For strengthening the steadiness connected, and Simplified flowsheet etc., the preferred cover board connecting component 2 of the present invention is arranged in the through hole 11 of cover board body 1, better sealing-in.The installation of electrode terminal 3 is convenient in the present invention, and preferably, cover board connecting component 2 comprises a mounting groove 22, and electrode hole 21 runs through the bottom 223 of mounting groove 22.Preferably, mounting groove 22 prolongs periphery and comprise turnup structure 221, be connected with cover board body 1 by turnup structure 221, not only weld more aspect, and can avoid because the impact brought with the sealing property of change in size on cover plate assembly a little during ceramic seal 4 high-temperature soldering, sealing property is better, and technique is simpler, need not consider the scale error of cover board connecting component 2, battery yield improves.And the through hole 11 of the present embodiment can be set to stepped hole in better situation, the step 111 that the turnup structure 221 of cover board connecting component 2 is positioned at stepped hole is connected with cover plate, namely turnup structure 221 engages cover board body 1, overlap with stepped hole, connect more firm, the thickness that can arrange turnup structure 221 can just compensate cover board body 1 part that the step 111 of stepped hole lacks, namely cover board connecting component 2 can better be made of one structure with cover board body 1, improve the connectivity robustness of cover board connecting component 2 and cover board body 1, ensure the smooth of cover board body 1 surface simultaneously, the less internal diameter of general design stepped hole is greater than 223 diameters bottom mounting groove, be convenient to place mounting groove, be less than the whole external diameter with the mounting groove of turnup structure 221, stepped hole is greater than the whole external diameter with the mounting groove of turnup structure 221 compared with large diameter, coordinate better.Height the present invention of cover board connecting component 2 does not limit, and can be less than the thickness of cover board body 1, preferably quite.Preferably, bottom the cell wall 222 of mounting groove and mounting groove, the connection of 223 connects for smoothly transitting, such as accompanying drawing 1, 224 can be connected for arc, the cell wall 222 of mounting groove is connected with turnup structure 221 and connects for smoothly transitting, such as accompanying drawing 1, 224 can be connected for arc, ensure that each parts are fixedly connected with in process can in time mechanical stress be carried out cushioning and weakening, and the bending strength of cover plate assembly can be strengthened, ensure the good sealing property of cover plate assembly of the present invention, wherein the cell wall 222 of mounting groove itself also can slow down the stress produced when cover board connecting component 2 welds with ceramic seal 4.Cover board connecting component 2 can be commercial, can adopt the one-body molded preparation of thinner sheet metal, and the thickness of such as battery connecting piece can be 0.8mm, can have certain toughness etc., convenient welding.
Number the present invention of the electrode hole 21 of cover board connecting component 2 does not limit, such as can design according to the number of electrode terminal 3, a large cover board connecting component 2 such as only can be set in the through hole of cover board body 1, cover board connecting component 2 arranges the electrode hole with extraction electrode terminal 3 equal number, then each electrode terminal 3 is through an electrode hole extracted current, is provided with insulating sealer between the electrode terminal 3 of at least one polarity and cover board connecting component 2.Also can, according to the number of the number design cover board connecting component 2 of electrical terminal, only have an electrode hole in cover board connecting component 2, or in multiple cover board connecting component 2, the electrode hole number of each cover board connecting component 2 be also different.
The material consistent with cover board body 1 generally selected by the material of cover board connecting component 2.Can be such as aluminium alloy 3003, fine aluminium, not only weld more convenient, and ensure the intensity of cover plate assembly.
Inside battery electric current is drawn in electrode terminal 3 and pole piece conducting, and number the present invention of electrode terminal 3 does not limit, and the size according to extracted current designs.Shape the present invention of electrode terminal 3 does not also limit, for the baby battery of routine, even can for the lug that pole piece is arranged, be generally the metallic conduction parts of connecting tab, such as pellet electrode terminal, pole etc., pellet electrode terminal, pole can realize conducting with pole piece with the tab welding that arranges on pole piece, also can pass through brace, and brace conducts with the realization such as the tab welding that arranges on pole piece and pole piece again.
As shown in accompanying drawing 1,2,3,5, the concrete preferred electrode terminal 3 of the present embodiment comprises pole 32 and polar cap 31.Polar cap 31 and pole 32 can be one-body molded, also can be rear welding or cold-heading assembling.Material the present invention of polar cap 31 and pole 32 does not limit, and can adopt conventional material, such as, for positive electrode terminal, can be fine aluminium etc., negative electrode terminal can be fine copper etc.
The shape of general pole 32 is cylindrical, and in the present embodiment, the diameter of pole 32 is 9mm ± 0.5mm, the size of other parts in cover plate assembly, such as: the large I of through hole 11, electrode hole 21, mesopore 41 is determined according to the diameter of pole 32.Polar cap 31 external diameter is greater than pole 32, and can be thicker cylindric, can be also thinner circular metal plate etc., the present invention limit, and also can process polar cap 31, and such as top end face edge chamfer etc. are convenient to external loading and are connected.Pole 32 comprises two ends, and one end is first end, and the other end is the second end, and polar cap 31 is positioned at the first end of pole 32, and in the placement figure of the present embodiment, electrode terminal 3 can regard " T " font as.Preferably, in polar cap 31 inner surface and Fig. 1 polar cap 31 lower surface on be also provided with buffer structure 311, for cushioning or reducing the stress when electrode tip 3 welds with ceramic seal 4, in better situation, buffer structure 311 can be support ring, namely on the lower surface of polar cap 31, ring-type support rim is made, external diameter the present invention of ring-type support rim does not limit, generally be slightly smaller than polar cap external diameter, thickness does not also limit, be generally 1/3 ~ 3/4 of the ring thickness of the insulating sealer of corresponding clamping, the height of boss can be greater than 1/3 of the height of the insulating sealer of corresponding clamping, the present embodiment is 8.8 for external diameter
0 -0.03polar cap 21, can extend from outward flange 1.5 ± 0.05mm place at its lower surface is highly 1.0 ± 0.05mm, and external diameter is 9.2 ± 0.05mm, and internal diameter is 8.2 ± 0.05mm and thickness is the annular boss of 1.0 ± 0.05mm.Annular boss is not generally combined with pole 32, and its internal diameter is greater than pole 32 external diameter, and there is certain gap between pole 32.Buffer structure 311 can be one-body molded with polar cap 31, makes this structure when making polar cap 31, after also can being, buffer structure 311 be welded on polar cap 31 lower surface.
Insulating sealer insulated enclosure is provided with between general electrode terminal 3 and cover board connecting component 2, insulating sealer the present invention do not limit, can be such as moulding, when injection moulding high temperature being prevented the impact of cover board body 1 for technical scheme of the present invention during moulding.The present invention preferably adopts ceramic seal 4 insulated enclosure.As shown in accompanying drawing 1,2,3,6, preferably, ceramic seal 4 comprises and is arranged in sealing 42 in electrode hole 21 and external diameter and is greater than the connecting portion 43 that sealing 42 is connected with cover board connecting component 2, in better situation, connecting portion 43 is arranged in mounting groove and is connected with cover board connecting component 2, is namely fastened on mounting groove inside, more easily welds, connect more firm, the external diameter of the apertures sealing 42 of general design electrode hole 21, is less than the external diameter of connecting portion 43, makes cover plate assembly have good sealing.Connection can adopt the method for attachment that well known to a person skilled in the art various pottery and metal, such as can adopt after ceramic surface metallization with metal solder etc., such as, be provided with the first metallic solder layer (not shown) between the inner surface being specifically as follows bottom connecting portion 43 and mounting groove 223, wherein, first metallic solder layer is by being formed by Welding between inner surface again and bottom mounting groove after metallizing to connecting portion surface, metallization can adopt ceramic surface metallization technique common in prior art, such as can carry out manganese molybdenum to ceramic surface.Under preferable case, ceramic metallization completes and 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 bottom connecting portion 43 and mounting groove 223 inner surface between by arranging transition metal ring, the mechanical stress produced when transition metal ring plate is for cushioning or reducing soldering.Transition metal ring plate can adopt common various easily and copper or copper alloy, aluminum or aluminum alloy carries out the metal material that welds, such as can adopt kovar alloy fine aluminium, aluminium alloy, etc.The maximum outside diameter of transition metal ring plate can be identical with the external diameter of the connecting portion of ceramic seal 4, also can be different, and the present invention is not particularly limited.More preferably, in situation, the element that nickel plating, aluminium etc. do not affect welding also can be carried out, to strengthen the mechanical strength of welding position and base material to be welded in transition metal ring plate surface.Welding is the welding procedure that those skilled in the art commonly use, and repeats no more in the present invention.Pass through Welding, can welding node place and base material to be welded will be made to form integrative-structure, namely be welded into one between cover board connecting component 2 and ceramic seal 4 structure, ensure its sealing intensity on the one hand, reduce the interface difference of material on the other hand, thus reduce the internal resistance of cover plate assembly, reduce battery-heating amount.
Ceramic seal 4 center is formed with mesopore 41, and electrode terminal 3, through this mesopore 41, draws inside battery electric current, is insulated by ceramic seal 4 and cover board connecting component 2 simultaneously.In the present embodiment, mesopore 41 internal diameter of ceramic seal 4 mates with pole 32 external diameter of the electrode terminal 3 through it, the external diameter of pole 32 can be a bit larger tham, make to form gap between mesopore 41 and pole 32, to avoid ceramic seal expanded by heating, be less than the external diameter of polar cap 31, thus ensure to wear pole 32, polar cap 31 can be made again to be connected on ceramic seal 4, thus to make, between ceramic seal 4 and electrode terminal 3, there is good sealing.Polar cap 31 is connected with connecting portion 43 outer face.Connection can adopt the method for attachment that well known to a person skilled in the art various pottery and metal, such as can adopt metal promoted solder flux etc., such as be specifically as follows and be provided with the second metallic solder layer (not shown) between polar cap 31 and connecting portion 43 outer face, the second metallic solder layer is formed by Welding again and between polar cap 31 after metallizing to connecting portion 43 outer face.Wherein, first metallic solder layer is formed by Welding again and between the inner surface of polar cap 31 after metallizing to connecting portion end face, metallization can adopt ceramic surface metallization technique common in prior art, such as, can carry out manganese molybdenum to ceramic surface.Under preferable case, ceramic metallization completes and 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.Preferably can also also be provided with transition metal ring plate between polar cap 31 and connecting portion 43 outer face, the mechanical stress produced when transition metal ring plate is for cushioning or reducing soldering.Transition metal ring plate can adopt common various easily and copper or copper alloy, aluminum or aluminum alloy carries out the metal material that welds, such as, can adopt kovar alloy or copper or copper alloy, aluminum or aluminum alloy.The maximum outside diameter of transition metal ring plate can be identical with the external diameter of the connecting portion of ceramic seal 4, also can be different, and the present invention is not particularly limited.More preferably, in situation, the element that nickel plating, aluminium etc. do not affect welding also can be carried out, to strengthen the mechanical strength of welding position and base material to be welded in transition metal ring plate surface.。Welding is the welding procedure that those skilled in the art commonly use, and repeats no more in the present invention.Pass through Welding, can welding node place and base material to be welded will be made to form integrative-structure, namely be welded into one between cover board connecting component 2 and ceramic seal 4 structure, ensure its sealing intensity on the one hand, reduce the interface difference of material on the other hand, thus reduce the internal resistance of cover plate assembly, reduce battery-heating amount.
Ceramic seal 4 can be the one in aluminium oxide ceramics ring, zirconia ceramics ring, aluminium nitride ceramics ring, boron nitride ceramics ring, silicon nitride ceramics ring, aluminium oxide and zirconic composite ceramics ring, preferential oxidation aluminium ceramic ring, aluminium oxide and zirconic composite ceramics ring, in the present embodiment, the aperture of the mesopore formed in the middle part of ceramic seal 4 is ￠ 6.2 ± 0.1mm, thickness is 2.5 ± 0.1mm, the decay resistance of ceramic seal 4 is very good, by electrolytic corrosion, can not can ensure the useful life of lithium ion battery; And impact strength, the thermal shock resistance of ceramic seal 4 are better than vitreum, make the structure of cover plate assembly more stable, sealing effectiveness is better; It is worth mentioning that, adopt ceramic seal 4 as sealing-in medium, compared to employing ceramic wafer, its thickness is thicker, thermal shock resistance and thermal circulation performance better.
In the present embodiment, pole 32 is located in the mesopore 41 of ceramic seal 4, and the second end extends ceramic seal 4, for conducting with the pole piece in battery container.In better situation, arrange electrode connecting piece 5, the second end extending the pole 32 of ceramic seal 4 is connected (as shown in Figure 3) with electrode connecting piece 5, then by electrode connecting piece 5 and the tab welding on pole piece, realizes the extraction of electric current.
Be generally and prevent short circuit, cover board body 1 or need insulation processing between cover board connecting component 2 and electrode connecting piece 5, such as, can put into sealing ring 6 between them.The present embodiment is specifically as follows the lower end sealing ring 6 of O type being set in ceramic seal 4, is coated on the lower end of ceramic seal 4 in sealing ring 6, and sealing ring 6 can use PP or PE plastic rubber material etc. to be insoluble to the material of electrolyte.
The concrete manufacture method of the cover plate assembly of the present embodiment, comprises the steps:
Step 1, to be metallized in two surfaces of the connecting portion of ceramic seal.
Step 2, cover board connecting component is socketed on the outside of the sealing of ceramic seal; In this step, the cover board connecting component of metal and the connecting portion of ceramic seal adopt soldering processes or founding to weld mutually, described soldering processes need below base material metal fusing point, use scaling powder to realize welding, founding then only need by realizing metal and ceramic connection after the mother metal of deposite metal, the step of founding and parameter have also been conventionally known to one of skill in the art.The solder that soldering processes adopt can be the solder for welding ceramics and aluminium such as Al-Si alloy, Al-Mg alloy, Al-Si-Mg alloy, in the preferred case, the solder that soldering processes adopt is Al-Si alloy, wherein, the content of Si is 0-12wt%, the content of preferential Si is 5-8wt% surplus is Al, makes welding effect better; The temperature of soldering processes is 570-625 DEG C DEG C, and atmosphere is vacuum or inert gas atmosphere, and described inert gas atmosphere is preferably nitrogen, nitrogen and hydrogen mixed gas atmosphere.In the preferred case, the temperature of described founding is 600-1300 DEG C, and atmosphere is vacuum or inert gas atmosphere.
Step 3, be inserted in the above-mentioned mesopore being connected with the ceramic seal of cover board connecting component by the pole of electrode terminal, mesopore is extended in end, and the polar cap of electrode terminal welds mutually with the end face of the connecting portion of ceramic seal.In this step, the polar cap of metal and the connecting portion of ceramic seal adopt soldering processes or founding to weld mutually, described soldering processes need below base material metal fusing point, use scaling powder and solder to realize welding, founding then only need by realizing metal and ceramic connection after the mother metal of deposite metal, the step of founding and parameter have also been conventionally known to one of skill in the art.The solder that soldering processes adopt can be the solder for welding ceramics and aluminium such as Al-Si alloy, Al-Mg alloy, Al-Si-Mg alloy, in the preferred case, the solder that soldering processes adopt is Al-Si alloy, wherein, the content of Si is 0-12wt%, the content of preferential Si is 5-8wt%, and surplus is Al, makes welding effect better; The temperature of soldering processes is 570-625 DEG C, and atmosphere is vacuum or inert gas atmosphere, and described inert gas atmosphere is preferably the mixed-gas atmosphere of nitrogen, nitrogen and hydrogen.In the preferred case, the temperature of described founding is 600-1300 DEG C, and atmosphere is vacuum or inert gas atmosphere.
Step 4, through spilling an O RunddichtringO in the ceramic seal of electrode hole and the outer cover of pole after electrode hole, a sheet electrode leading-out sheet is welded again at the end vertical of the pole extending mesopore, welding can be physical weld method, physical weld method is electric resistance welding, Laser Welding or ultrasonic bond, for realizing welding between metal with 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 repeat at this.
Step 5, again by the through hole above-mentionedly preparing all-in-one-piece electrode terminal, ceramic seal, cover board connecting component put into cover board body, the turnup structure of cover board connecting component is overlapped on the step of stepped hole, after turnup structure welded with cover board body cover plate assembly made integrative-structure, welding can be physical weld method, physical weld method is electric resistance welding, Laser Welding or ultrasonic bond, for realizing welding between metal with 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 repeat at this.
Above-mentioned preparation method, an electrode terminal can be prepared on a cover board body, also the electrode terminal of opposed polarity can be prepared, the order of above-mentioned preparation method can adjust according to mounting means and welding temperature, general when electrode terminal is negative electrode terminal, can directly be prepared, 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 and step 2,3 is merged, weld together again after first assembling by electrode terminal, ceramic seal, cover board body opsition dependent relation.Such as when electrode terminal containing both positive and negative polarity, first with reference to above-mentioned steps 1,2, a kind of electrode terminal of polarity such as negative electrode terminal and ceramic seal can be made integrative-structure, after integrative-structure and cover board body are assembled, refer again to step 1 by the ceramic seal surface metalation of the electrical terminal of another kind of polarity such as positive electrode terminal, after positive electrode terminal, ceramic seal and cover board body are assembled, refer again to the welding that step 3 carries out negative electrode terminal, positive electrode terminal, finally carry out subsequent step etc.
when assembling whole lithium ion battery, such as: the one end open of housing, pole piece is positioned in housing, and to fluid injection in housing, then the cover plate assembly being 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 with the electrode leading-out sheet that one of them electrode terminal is connected by anode ear, the negative plate of pole piece is connected with the electrode leading-out sheet that another electrode terminal is connected by negative electrode lug, concrete structure is by existing techniques in realizing), after installation, seal cavity is formed between cover plate assembly and housing, pole piece and electrolyte is contained in sealing space, two electrode terminals are respectively as the two poles of the earth of lithium ion battery, can external power consumption equipment.
Again such as: with the equal opening in the two ends of housing, mounting cover board component respectively, wherein a cover plate assembly is the cover plate assembly having anode electrode terminal, and another cover plate assembly is have the cover plate assembly of negative electrode terminal to be example, these two cover plate assemblies are installed on respectively two openends of housing, in the process, the periphery of these two cover plate assemblies is welded mutually with housing, and the pole of these two cover plate assemblies is connected (specifically with pole piece, the positive plate of pole piece is connected by the pole of anode ear with the cover plate assembly having anode electrode terminal, the negative plate of pole piece is connected by the pole of negative electrode lug with the cover plate assembly having negative electrode terminal, concrete structure is by existing techniques in realizing), after installation, these two form seal cavity between cover plate assembly and housing, pole piece and electrolyte is contained in sealing space, the stem stem of these two cover plate assemblies is respectively as the two poles of the earth of lithium ion battery, can external power consumption equipment.
After the present invention adopts and is first connected with cover board connecting component insulated enclosure by electrode terminal, be connected with cover board body by cover board connecting component again, because cover board connecting component can adopt less structure, when being ceramic seal high-temperature soldering, not yielding, and it is also capable of washing after sintering, conveniently be easy to get, again cover board connecting component is welded with cover board body, the Main Function of cover board connecting component is by ceramic seal, electrode terminal and cover board body are sealedly connected, therefore its shape is not also specially required, volume is little, amorphism particular/special requirement and special parts, therefore during high temperature, distortion itself is also little, the sealing of battery can not be affected, the cover board connecting component of material the same as cover board body is welded with cover board body, easy realization, and on the intensity of cover board body etc. without impact, technical scheme of the present invention can be enhanced productivity, reduce cost of manufacture, particularly yield is high, security performance is good, for the practical application of the battery of ceramic seal and development are laid a good foundation.
Those skilled in the art easily know; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement 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 (21)
1. a cover plate assembly, is characterized in that, comprises cover board body, cover board connecting component and electrode terminal;
Described cover board connecting component has the electrode hole running through cover board connecting component, described electrode terminal is through insulated enclosure between electrode hole and cover board connecting component;
Described cover board body has the through hole running through cover board body, described electrode terminal is through described through hole extracted current;
Described cover board connecting component and cover board body are tightly connected;
Described cover board connecting component is arranged in described through hole;
Described cover board connecting component comprises a mounting groove, and described electrode hole runs through bottom mounting groove;
Described mounting groove prolongs periphery and comprises turnup structure, described turnup structure is connected with cover board body.
2. cover plate assembly according to claim 1, is characterized in that, described through hole is stepped hole, and the step that described turnup structure is positioned at stepped hole is connected with cover plate.
3. cover plate assembly according to claim 1, is characterized in that, the connection bottom the cell wall of described mounting groove and mounting groove connects for smoothly transitting, and the cell wall of described mounting groove is connected with turnup structure and connects for smoothly transitting.
4. cover plate assembly according to claim 1, is characterized in that, clamps ceramic seal insulated enclosure between described electrode terminal and cover board connecting component.
5. cover plate assembly according to claim 4, is characterized in that, described ceramic seal center is formed with mesopore, and described electrode terminal is through described mesopore.
6. cover plate assembly according to claim 4, is characterized in that, described ceramic seal comprises and is arranged in sealing in electrode hole and external diameter and is greater than the connecting portion that sealing is connected with cover board connecting component.
7. cover plate assembly according to claim 6, is characterized in that, described cover board connecting component comprises a mounting groove, and described connecting portion is in mounting groove.
8. cover plate assembly according to claim 7, it is characterized in that, be provided with the first metallic solder layer between inner surface bottom described connecting portion and mounting groove, described first metallic solder layer is by being formed by Welding between the inner surface after metallizing to connecting portion surface again and bottom mounting groove.
9. cover plate assembly according to claim 7, is characterized in that, is also provided with transition metal ring between the inner surface bottom described connecting portion and mounting groove.
10. cover plate assembly according to claim 5, is characterized in that, described electrode terminal comprises pole and polar cap, and the two ends of described pole are first end and the second end, and described polar cap is positioned at the first end of pole; Described pole is arranged in the mesopore of ceramic seal, and the second end extends ceramic seal.
11. cover plate assemblies according to claim 10, is characterized in that, described ceramic seal comprises and is arranged in sealing in electrode hole and external diameter and is greater than the connecting portion that sealing is connected with cover board connecting component; Described polar cap is connected with connecting portion outer face.
12. cover plate assemblies according to claim 11, it is characterized in that, be provided with the second metallic solder layer between described polar cap and connecting portion outer face, described second metallic solder layer is formed by Welding again and between polar cap after metallizing to connecting portion outer face.
13. cover plate assemblies according to claim 11, is characterized in that, are also provided with transition metal ring plate between described polar cap and connecting portion outer face.
14. cover plate assemblies according to claim 9 or 13, it is characterized in that, transition metal ring plate is kovar alloy sheet.
15. cover plate assemblies according to claim 11, is characterized in that, described polar cap inner surface is also provided with buffer structure and is positioned between polar cap and connecting portion outer face.
16. cover plate assemblies according to claim 15, is characterized in that, described buffer structure is support ring.
17. cover plate assemblies according to claim 10, is characterized in that, described in extend the pole of ceramic seal the second end on be also connected with electrode connecting piece.
18. cover plate assemblies according to claim 17, is characterized in that, are provided with sealing ring between described cover board connecting component and electrode connecting piece.
19. cover plate assemblies according to claim 1, is characterized in that, the number of described electrode terminal is multiple, and described cover board connecting component has multiple electrode hole.
20. cover plate assemblies according to claim 1, is characterized in that, the number of described electrode terminal is multiple, and the number of described cover board connecting component is multiple.
21. 1 kinds of batteries, comprising: cover plate assembly, battery container, pole piece and electrolyte, and pole piece and electrolyte level are in battery container, and cover plate assembly and battery container are tightly connected; Inside battery electric current is drawn in electrode terminal on described cover plate assembly and pole piece conducting, it is characterized in that, described cover plate assembly is the cover plate assembly described in claim 1-20 any one.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117690.XA CN103378321B (en) | 2012-04-20 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
| PCT/CN2012/077667 WO2013000414A1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| KR1020147001293A KR101554441B1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| EP12804665.3A EP2727166B1 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery comprising the same |
| JP2014517423A JP5753317B2 (en) | 2011-06-28 | 2012-06-27 | Cover assembly and battery including the same |
| US14/137,696 US10333131B2 (en) | 2011-06-28 | 2013-12-20 | Cover assembly and battery comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210117690.XA CN103378321B (en) | 2012-04-20 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
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| Publication Number | Publication Date |
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| CN103378321A CN103378321A (en) | 2013-10-30 |
| CN103378321B true CN103378321B (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210117690.XA Active CN103378321B (en) | 2011-06-28 | 2012-04-20 | A kind of cover plate assembly and the battery containing this cover plate assembly |
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| CN103682184A (en) * | 2013-12-26 | 2014-03-26 | 深圳市科达利实业股份有限公司 | Power battery cover plate |
| CN104752675B (en) * | 2013-12-31 | 2017-07-21 | 比亚迪股份有限公司 | Electrode terminal, the battery cover board assembly with it, battery and battery pack |
| CN105810877B (en) * | 2013-12-31 | 2019-06-04 | 比亚迪股份有限公司 | Leading-out terminal, battery cover board assembly, battery and battery pack with it |
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| CN105789545A (en) * | 2014-12-23 | 2016-07-20 | 比亚迪股份有限公司 | Battery module, preparation method of battery module, battery pack and an electric car |
| CN105633309A (en) * | 2016-02-03 | 2016-06-01 | 深圳市三讯电子有限公司 | Electrode terminal, power battery cover plate assembly and power battery |
| CN105576161A (en) * | 2016-02-03 | 2016-05-11 | 深圳市三讯电子有限公司 | Electrode terminal, power battery cover plate assembly and power battery |
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| CN110828720A (en) * | 2019-11-12 | 2020-02-21 | 浙江锦泰电子有限公司 | Battery cover plate |
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