CN103378343B - A kind of electrode terminal, cover plate assembly and the battery containing the cover plate assembly - Google Patents
A kind of electrode terminal, cover plate assembly and the battery containing the cover plate assembly Download PDFInfo
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- CN103378343B CN103378343B CN201210117704.8A CN201210117704A CN103378343B CN 103378343 B CN103378343 B CN 103378343B CN 201210117704 A CN201210117704 A CN 201210117704A CN 103378343 B CN103378343 B CN 103378343B
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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 electrode terminal, cover plate assembly and the battery containing the cover plate assembly.Electrode terminal includes pole and the polar cap positioned at pole one end；Wherein, polar cap inner surface is provided with buffer structure, wherein, the inner surface of the present invention refers to the outer drain surface of the one side that polar cap is contacted with pole.When electrode terminal is welded with insulating sealer, the different materials difference coefficient of expansion part larger stress produced in welding can be slowed down well, reduce its impact to cover plate assembly, specifically address the stress occurred when the different materials for differing greatly are welded causes the problem of the easy fragmentation of ceramic seal, the reliability of product is improve, electrode terminal, cover plate assembly are easily prepared.The cover plate assembly process is simple of preparation, easily welds, and the yield of product is high, and good stability is that 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 electrode terminal, cover plate assembly and the battery containing the cover plate assembly.
Background technology
Lithium ion battery belongs to a kind of important product of new forms of energy, with pollution-free, capacity it is high, have extended cycle life etc. it is excellent
Point.The fields such as current lithium-ion-power cell, lithium ion tool batteries, network energy.Lithium ion battery be by positive plate, every
After film, negative plate wind or be stacked to pole piece, pole piece is put in the cavity that battery container and seal cover board are formed, internal injection
Electrolyte is obtained Jing after the steps such as sealing chemical conversion.And seal cover board is used as the indispensable parts component of lithium battery sealing member,
Its safety, sealing, resistance to ag(e)ing, insulating properties and the space size that takes in battery etc. have critically important meaning, separately
Enclosing cover board component takes the certain cost of whole lithium battery, there is provided its production efficiency, yield rate can largely reduces costs.
At present, lithium ion battery mainly using plastic injection reach sealing and insulate, cover plate main body be all integral type with
Positive pole exit, negative pole exit carry out injection and are combined together, and so do not only result in moulding volume greatly, and it is difficult to occur during injection
In reach the injection of each position seal concordance is fine, fraction defective is high, the problem that production efficiency is also low, and gold when being molded
Category part is needed through certain temperature, is easily caused metalwork and is oxidized and contaminated, and overall cover plate materials change softening
The problems such as.In addition, using injection molding plastic material to play sealed insulation effect, plastics ageing-resistant performance is not high, compactness is low,
And it is combustible material, service life is shorter, and security performance is relatively low.
The current insulated enclosure for also having research that ceramics are used for cover plate as sealing member, but as ceramic hardly possible is welded and frangible
Easily split, current application is limited to the application of ceramic gasket, also need such as plastic cement seal member of other routines etc. to be used for
Sealing between cover plate and electrode terminal.When the ceramic seal insulated enclosure clamped between cover plate and electrode terminal, due to
The difference of material, larger stress is produced during welding makes the frangible ceramic seal fragmentation easily split, and increased the unreliable of product
Property, uncontrollability, reduce the security performance of lithium battery, while technology difficulty increase, battery fraction defective increases, have impact in fact
Apply and develop in border.
The content of the invention
, in order to solve existing ceramics as the difficult welding of cover plate assembly of sealing member, fraction defective is high, and affects for the present invention
The technical problem of the security performance of battery.Easily prepare there is provided a kind of, be more easy to large-scale production, and ceramic seal when preparing
Not easily broken, yield is high, the high cover plate assembly of security performance and prepares the electrode terminal of the cover plate assembly and and containing the cover plate
The battery of component.
First mesh of the present invention is to provide a kind of electrode terminal includes pole and the polar cap positioned at pole one end；Wherein,
Polar cap inner surface is provided with buffer structure, wherein, the inner surface of the present invention refers to the leakage table of the one side that polar cap is contacted with pole
Face.
It is preferred that, buffer structure is support ring.
It is preferred that, buffer structure is structure as a whole with polar cap.
It is preferred that, the internal diameter of support ring is more than or equal to the external diameter of polar cap.
Or preferably, the external diameter of support ring is less than the external diameter of polar cap.
It is preferred that, sheet metal of the polar cap for thickness 0.5-1.0mm.
Or preferably, polar cap is height more than pole height 1/4, less than the cylinder of pole height 1/2.
It is preferred that, the outer face periphery of polar cap contains lead angle.
It is preferred that, pole includes two sections, and contacted with polar cap section is the first pole, and another section is the second pole, wherein, the
The external diameter of two poles is less than the first pole.
Second mesh of the present invention is to provide a kind of cover plate assembly, including cover board body, insulating sealer and electrode terminal；
Wherein, electrode terminal is above-mentioned electrode terminal；Wherein, there is on cover board body the through hole through cover board body, electrode terminal
Pole passes through the through hole extracted current；Insulating sealer insulated enclosure is clamped between cover board body and electrode terminal；Buffer structure
Between polar cap and insulating sealer.
It is preferred that, through hole contains the mounting groove on protrusion cover board body surface, installs trench bottom and contains electrode hole, wherein, electrode
The pole of terminal passes through above-mentioned electrode hole.Wherein, cover board body surface can refer to that the upper surface of battery leakage can also refer to and be located at
Lower surface inside battery container.
Further preferably, the periphery edge of electrode hole contains the second lead angle.
It is preferred that, edge sealing member is ceramic seal, and ceramic seal is centrally formed with mesopore, wherein, the pole of electrode terminal
Post passes through above-mentioned mesopore.
It is preferred that, porcelain sealing member includes the sealing being arranged in through hole and external diameter more than sealing and buffer structure and cover plate
The connecting portion of body connection.
Or preferably, through hole contains the mounting groove on protrusion cover board body surface, trench bottom is installed and contains electrode hole, ceramics are close
Sealing includes that the sealing being arranged in electrode hole and external diameter ease up more than sealing and installation trench bottom the company for rushing that structure is connected
Socket part.
Further preferably, connecting portion is in through hole.
It is preferred that, the first metallic solder layer, the first metallic solder layer are provided between the inner surface of connecting portion and installation trench bottom
Formed by Welding between the inner surface of installation trench bottom after by metallizing to connecting portion surface again.
Or preferably, between the inner surface of connecting portion and installation trench bottom, it is additionally provided with transition metal ring.
It is preferred that, the second metallic solder layer is provided between buffer structure and connecting portion outer face, the second metallic solder layer passes through
Formed by Welding between buffer structure after metallizing to connecting portion outer face again.
Or preferably, between buffer structure and connecting portion outer face, it is additionally provided with transition metal ring plate.
It is preferred that, pole includes two sections, contacted with polar cap section be the first pole, another section be the second pole, the second pole
The external diameter of post is less than the first pole, and the first pole is arranged in the mesopore of ceramic seal, and the second pole extends pottery together
Porcelain sealing member.
Further preferably, cover plate assembly also includes electrode connecting piece, has the peace for installing electrode terminal in electrode connecting piece
Dress hole, wherein, the second pole is installed in above-mentioned installing hole.
Or preferably, cover plate assembly also includes electrode connecting piece, has the installation for installing electrode terminal in electrode connecting piece
Hole, wherein, polar cap is installed in above-mentioned installing hole.
It is preferred that, sealing ring is provided between cover board body and electrode connecting piece.
It is preferred that, the number of electrode terminal is multiple, has multiple through holes on the cover board body.
3rd mesh of the present invention is to provide a kind of battery, including：Cover plate assembly, battery container, pole piece and electrolyte, pole
, in battery container, cover plate assembly is tightly connected with battery container for core and electrolyte level；Electrode terminal on the cover plate assembly
Inside battery electric current is drawn with pole piece conducting, it is characterised in that the cover plate assembly is above-mentioned cover plate assembly.
The present invention adopts the electrode terminal with buffer structure, when electrode terminal is welded with insulating sealer, can be fine
Slow down different materials difference coefficient of expansion part produced larger stress in welding, reduce its shadow to cover plate assembly
Ring, specifically address the stress occurred when the different materials for differing greatly are welded causes the problem of the easy fragmentation of ceramic seal, carries
The high reliability of product, while the lithium battery of currently preferred ceramic seal cover plate assembly has the spy of ageing-resistant life-span length
Point, security performance are higher.The present invention preferably through hole contains the mounting groove on protrusion cover board body surface simultaneously, installs trench bottom and contains
Electrode hole, wherein, the pole of electrode terminal passes through above-mentioned electrode hole, can further solve insulating sealer and weld with cover board body
When stress, further improve cushioning effect.The electrode terminal of the present invention, cover plate assembly are easily prepared.The cover plate group of preparation
Part process is simple, easily welds, and the yield of product is high, and good stability is that the practical application of the battery of ceramic seal and development are established
Basis.
Description of the drawings
Fig. 1 is a kind of dimensional structure diagram of electrode terminal of the present invention.
Cross-sectional views of the Fig. 2 for the electrode terminal of embodiments of the invention.
Dimensional structure diagrams of the Fig. 3 for the electrode terminal of embodiments of the invention.
Cross-sectional views of the Fig. 4 for the cover plate assembly of embodiments of the invention.
Cross-sectional views of the Fig. 5 for the cover board body of embodiments of the invention.
Partial enlargement structural representations of the Fig. 6 for through hole on the cover board body of embodiments of the invention.
Dimensional structure diagrams of the Fig. 7 for the ceramic seal of embodiments of the invention.
Battery cross-sectional views of the Fig. 8 for embodiments of the invention.
Specific embodiment
In order that the technical problem to be solved, technical scheme and beneficial effect become more apparent, below tie
Drawings and Examples are closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
To explain the present invention, it is 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 table
Show same composition part.And it is to be understood that in describing the invention, " on ", the relative bearing term such as D score, represent lid
Relative position of each part and its ingredient in board component in the sectional view of the cover plate assembly shown in Fig. 1, in order to right
Each part and its ingredient are described；But it is not used to the reality in lithium ion battery to these parts and its ingredient
Border is installed and position relationship is defined, and which may be differed with actual installation situation, be not limited to the scope of the present invention.
The cover plate assembly of the present invention is used for the sealing of battery, more for the sealing of lithium ion battery, especially big work(
Rate lithium ion battery, for example：The sealing of lithium-ion-power cell, lithium-ion energy storage battery.It will be apparent to one skilled in the art that lithium
Ion battery mainly includes：At least housing of one end open, the pole piece being positioned in housing and the electrolysis being contained in housing
Liquid.In order to avoid spilling for electrolyte, the opening of housing is sealed using cover plate assembly.Wherein, housing is generally aluminum
Shell or box hat, for placing pole piece and accommodating electrolyte, opening can be one i.e. one end open, draw electricity from battery one end
Stream, or two, i.e. both ends open, from the two ends extracted current of battery, the position of opening does not also limit, can be from short
Side opening, pole piece are directly vertically put in battery container, that is, be open pole piece end of the exposed portion for extracted current, it is also possible to from
Long side opening, the direct level of pole piece are put in battery container, that is, the exposed portion that is open is the winding arc-shaped edges for winding pole piece.It is described
Pole piece is sequentially stacked or is wound by positive plate, barrier film, negative plate and formed, and the structure and manufacture method of pole piece can pass through prior art
Realize, will not be described here.
The present embodiment specifically describe cover plate assembly, as shown in figure 4, cover plate assembly include cover board body 1, electrode terminal 2 and
Insulating sealer.
Electrode terminal 2 draws inside battery electric current with pole piece conducting, and the number present invention of electrode terminal 2 is no to be limited, root
It is designed according to the size of extracted current.Electrode terminal 2 is generally the metallic conduction part of connecting tab, can directly and pole piece
The tab welding of upper setting is realized conducting with pole piece, it is also possible to by connection connection sheet, connection sheet again with arrange on pole piece
The realizations such as tab welding are conducted with pole piece.
The electrode terminal 2 of the present invention includes pole 22 and the polar cap 21 positioned at pole one end.Polar cap 21 and pole 22 can be with
It is to be integrally formed, or welding or cold-heading assembling afterwards.The material present invention of polar cap 21 and pole 22 can be adopted without limiting
With conventional material, such as positive electrode terminal, can be fine aluminium, aluminium alloy etc., negative electrode terminal can be fine copper etc..
The shape present invention of polar cap 21 and pole 22, without limiting, need to be only the two parts of connection of intersecting, one
As be vertical connection, can for example be the connection of orthogonal rectangle lamellar pole and rectangle lamellar polar cap, according to reality
Border situation is assembled, and in the placement figure of the present embodiment, electrode terminal 2 can regard inverted " t " font as.The present embodiment specifically with
The cylindrically shaped of pole 22 is described, in the present embodiment, a diameter of 6.0 ± 0.05mm of pole 22, cover plate assembly
In other parts size, for example：Through hole 11, electrode hole 1111, the big I of mesopore 33 are carried out really according to the diameter of pole 22
It is fixed.The shape present invention of polar cap 21 is preferably coordinated with the cylinder of pole 22, and its orthographic projection is circle, for example, can be thicker
It is cylindric, it is preferable that more than the 1/4 of pole height, less than the 1/2 of pole height.In the present embodiment, highly specially 2.5 ±
0.05mm, basal diameter are specially 8.80 -0.03Mm, as shown in accompanying drawing 2,3, or relatively thin circular metal plate etc., thickness
Can be 0.8mm, external diameter be more than pole, as shown in Figure 1.The present invention is without restriction.
The present invention's thes improvement is that 21 inner surface of polar cap is provided with buffer structure.In accompanying drawing 1,2,3, i.e. polar cap 21
Lower surface be provided with buffer structure, the stress between different materials can be slowed down when electrode terminal and insulating sealer are welded, subtracted
Impact of the little welding to cover plate assembly.The buffer structure present invention is no to be limited, general only to play buffering effect, general
One support member need to be set between polar cap 21 and insulating sealer, for example, can be and the integrally formed boss of polar cap, it is convex
The number and shape of platform is not limited, it is also possible to be integrally formed the honeycomb body with buffering effect, honeybee in polar cap lower surface
Nest metallic object can be lamellar etc..The present invention is preferably support ring 211, i.e., make circumferential support on the lower surface of polar cap convex
Platform, the shape present invention of support ring 211 are not also limited, and need to are only ring bodies, for example, can are annulus, or side
Ring, hexahedron ring etc., the external diameter present invention of circumferential support boss can be more than the external diameter of polar cap, it is also possible to be less than without limiting
The external diameter of polar cap, the internal diameter of the support ring 211 of the present invention can be more than or equal to the external diameter of polar cap 21, then now general polar cap 21 with
Contain between support ring 211 and be provided with part connection surface.The external diameter of support ring 211 might be less that the external diameter of polar cap 21, ring-type
Support boss can be combined together with the pole 22 of 21 lower surface of polar cap, that is, be coated on part pole surface, it is also possible to not with pole
Post 22 is combined, and its internal diameter is more than 22 external diameter of pole, there is certain gap between pole 22.The ring thickness of support ring 211 does not have yet
It is restricted, generally correspond to the insulating sealer of clamping ring thickness 1/3 ~ 3/4, it is exhausted that the height of boss correspondingly can be clamped
The 1/4 ~ 1/2 of the height of edge sealing member, the present embodiment are 8.8 for external diameter0 -0.03The polar cap 21 of mm, can its lower surface from
Extending height at 0.8 ± 0.05mm of outward flange for 1.0 ± 0.05mm, external diameter is 9.2 ± 0.05mm, internal diameter is 8.2 ±
0.05mm is the annular boss that thickness is 1.0 ± 0.05mm.Buffer structure can be integrally formed with polar cap 21, make polar cap 21
When make this structure, or after buffer structure is welded on into 21 lower surface of polar cap.
The present invention can also be processed to the outer face of polar cap 21, and for example the outer face periphery in polar cap contains first and leads
Angle 212.Be easy to be connected with external loading or be connected with electrode connecting piece, it is more easy to install enter electrode connecting piece installing hole in weld
Connect, while being such as also possible to prevent solder diffusing for soldering processes, concentration solder is at soldering opening.
In the present embodiment, pole 22 includes two sections, and contacted with polar cap 21 section is the first pole 221, and another section is second
Pole 222, the external diameter of the second pole 222 are less than the first pole 221, the metallic conductor for being easy to clamping to be connected with the second pole 222
Deng.In the present embodiment, the first pole 221 is arranged in the mesopore 31 of ceramic seal 3, and the second pole 222 extends together
Go out 3 extracted current of ceramic seal, used as battery electrode outlet terminal, with external connection, the mode of connection can for the second pole 222
For welding procedures such as Laser Welding, electric resistance weldings.
Cover board body 1 is used for sealing-in battery container, as shown in Figure 5, is typically provided through cover board body on cover board body 1
Through hole 11, for drawing inside battery electric current, the number present invention of through hole 11, can be according to design for drawing without limiting
The number for going out the electrode terminal 2 of electric current is designed, such as, when battery is one end extracted current, can contain on cover board body 1
There is a through hole 11, the electrode terminal 2 for an a kind of polarity is passed, now, such as pole of electrode terminal 2 of another polarity
Ear can be connected extracted current with housing, and the electrode terminal 2 for now generally passing through cover board body 1 typically needs insulation processing.Cover plate
Multiple through holes 11 can also be contained on body 1, the electrode terminal 2 for multiple same polarities is passed or multiple different pole pieces
Passing for electrode terminal 2, when when the passing of electrode terminal 2 for multiple different pole pieces, can only have a kind of electrode tip of polarity
Son 2 and 1 insulation processing of cover board body, also can equal insulation processing between electrode terminal 2 and cover board body 1.
The shape present invention of through hole 11 needs the pole 22 that can pass through electrode terminal 2 without limiting, only, for example, can be
Through the cylinder of cover board body 1, external diameter of the diameter slightly larger than the pole 22 of electrode terminal 2, the external diameter of polar cap 21 can be less than, with
Polar cap 21 engages, it is also possible to more than the external diameter of polar cap 21, and polar cap 21 is located therein in whole or in part, and the present invention is without restriction.
As shown in Figure 6, concrete mounting groove 111 of the preferably through hole 11 containing 1 surface of protrusion cover board body of the present embodiment, cover board body 1
Surface can refer to that the upper surface of battery leakage can also refer to lower surface inside battery container, according to electrode terminal 2
Installation relation is designed, such as when the polar cap 21 of electrode terminal 2 is located at for being connected with load outside battery container, the second pole
222 be located at battery container in for being connected with pole piece when, mounting groove 111 may be located at enclosure interior, the i.e. following table of cover board body 1
Face is protruding with mounting groove 111；When the second pole 222 of electrode terminal 2 is located at for being connected with load outside battery container, electrode tip
When the polar cap 21 of son 2 is located in battery container for being connected with pole piece, mounting groove 111 may be located at hull outside, i.e. cover plate sheet
The upper surface of body 1 is protruding with mounting groove 111.Installation relation to the accompanying drawing 4 of the present embodiment, is the upper surface protrusion of battery leakage
There is mounting groove 111.It can also be rear welding that mounting groove 111 can be structure as a whole with cover board body 1, mounting groove 111 itself
Annexation is preferably the connection that smoothly transits, such as, without obvious turning, be the company of arc transition, mounting groove 111 and cover board body 1
Connect, such as without obvious turning.Ensure that machinery can be answered during being fixedly connected by each part in time
Power is entered row buffering and is weakened, and can strengthen the bending strength of cover plate assembly, it is ensured that the excellent sealing of the cover plate assembly of the present invention
Property.Wherein, contain electrode hole 1111 in installation trench bottom, the pole 22 of electrode terminal 2 passes through above-mentioned electrode hole 1111.Electrode hole
The 1111 number present invention for example can be designed according to the number of electrode terminal 2 without limiting, for example can be in cover plate sheet
One big through hole 11 is set on body, a big mounting groove 111 is only projected on the big through hole 11 of here, is set trench bottom is installed
The electrode hole 1111 with 2 equal number of extraction electrode terminal is put, then each electrode terminal 2 is drawn through an electrode hole 1111
Electric current, clamps insulating sealer between the electrode terminal 2 and mounting groove 111 of at least one polarity.Can also be according to electrical terminal 2
The number of number design and installation groove 111, installs trench bottom only one of which electrode hole 1111, or in multiple mounting grooves 111 each
1111 number of electrode hole for installing trench bottom is also different.As shown in Figure 6,7, it is preferable that the periphery edge of electrode hole 1111 contains
Second lead angle 1112, is easy to penetrating, passing for ceramic seal and electrode terminal, and process is simple is easy to operate.
The number present invention of cover board body 1 is designed according to the opening number of battery container, cover board body without limiting
The 1 shape present invention is not also limited, and is designed according to the shape of the opening of battery container, is coordinated housing, for example, can be
Circle can also be square.Size such as thickness can be 2.0mm.The material present invention of cover board body is not also limited, for example
Can be selected from fine aluminium, aluminium alloy etc..On cover board body 1, other structures such as liquid injection port etc. and manufacture method can pass through prior art
Realize, will not be described here.
Insulating sealer insulated enclosure is clamped between cover board body 1 and electrode terminal 2, buffer structure is located at polar cap 21 with insulation
Between sealing member.The insulating sealer present invention can be moulding without limiting, such as, and as shown in Figure 7, the present invention is preferably adopted
With 3 insulated enclosure of ceramic seal, wherein, ceramic seal 3 is centrally formed with mesopore 33, and the pole 22 of electrode terminal 2 is passed through
Above-mentioned mesopore 33, clamps 3 insulated enclosure of ceramic seal between pole 22 and cover board body 1.In the present embodiment, ceramic seal
3 33 internal diameter of mesopore is matched with 22 external diameter of pole through its electrode terminal 2, can be slightly larger than the external diameter of pole 22 so that
Gap is formed between mesopore 33 and pole 22, to avoid 3 expanded by heating of ceramic seal, less than the external diameter of polar cap 21, so as to protect
Card can wear pole 22, and polar cap 21 can be connected on ceramic seal 3 again, so that ceramic seal 3 and electrode terminal 2
Between have good sealing.
Ceramic seal 3 includes the connecting portion 32 of sealing 31 and external diameter more than sealing, for the lid of conventional through holes 11
Plate body 1, sealing 31 are typically arranged in through hole 11, are clamped between pole 22 and cover board body 1, and connecting portion 32 is general to be pressed from both sides
Hold between buffer structure and cover board body 1, two surfaces are connected with buffer structure and cover board body 1 respectively.In the present embodiment, lead to
Mounting groove 111 of the hole 11 containing 1 surface of protrusion cover board body, the sealing 31 of ceramic seal 3 can be arranged in electrode hole
In 1111, two surfaces of connecting portion 32 can be connected with mounting groove bottom interior surface and buffer structure respectively, and connecting portion is in peace
In tankage 111, that is, be fastened on inside mounting groove 111, it is easier to weld, connection more firmly, wherein, connecting portion 32 can whole positions
In through hole 11, i.e., height is less than 1 thickness of cover board body, it is also possible to partly in through hole 11, i.e., height is higher than cover board body 1
Thickness, or it is identical with 1 thickness of cover board body, and, without limiting, in the present embodiment, the aperture of through hole 11 is more than or equal to company for the present invention
The external diameter of socket part 32, the external diameter of the apertures sealing 31 of electrode hole 1111, less than the external diameter of connecting portion 32, makes cover plate assembly
With good sealing.Connecting portion 32 can be adopted well known to a person skilled in the art various potteries with the connection for installing trench bottom
Porcelain and the method for attachment of metal, for example, can be for example specifically as follows in connecting portion 32 and mounting groove using metal scaling powder etc.
The first metallic solder layer is provided between the inner surface of bottom（Not shown in figure）, wherein, the first metallic solder layer is by connection
Portion is formed by Welding between the inner surface of installation trench bottom after being metallized on 32 surface again, and metallization can be using existing
There is common ceramic surface metallization technique in technology, for example, manganese molybdenum can be carried out to ceramic surface.Under preferable case, pottery
Porcelain metallization completes to can also continue to carry out the element that nickel plating, aluminum etc. do not affect to weld, to strengthen welding position and base material to be welded
Mechanical strength.Can also be preferably between the inner surface of connecting portion 32 and installation trench bottom by arranging transition metal ring, transition
Metal ring plate is used to buffering or reducing the mechanical stress produced during soldering.Transition metal ring plate can adopt common various easy aluminum or
The metal material welded by aluminium alloy, for example can be using fine aluminium, aluminium alloy etc..The maximum outside diameter of transition metal ring plate can be with
The external diameter of the connecting portion 32 of ceramic seal 3 is identical, also can be different, and the present invention is not particularly limited.Welding is this area
The welding procedure that technical staff commonly uses, repeats no more in the present invention.By Welding, will can make at welding node with base to be welded
Material forms the structure that is welded into one between integrative-structure, i.e. mounting groove 111 and ceramic seal 3, on the one hand ensures its sealing intensity,
On the other hand the interface difference of material is reduced, so as to reduce the internal resistance of cover plate assembly, battery-heating amount is reduced.
Buffer structure can also be adopted well known to a person skilled in the art various ceramics with the connection of 32 outer face of connecting portion
With the method for attachment of metal, for example, can be for example specifically as follows in buffer structure and connecting portion using welding material of metal etc.
The second metallic solder layer is provided between 32 outer faces（Not shown in figure）, the second metallic solder layer is by 32 outer face of connecting portion
Formed by Welding between buffer structure after being metallized again.Wherein, the first metallic solder layer is by connecting portion
End face is formed by Welding and the inner surface of buffer structure between after being metallized again, and metallization can adopt prior art
In common ceramic surface metallization technique, for example can carry out manganese molybdenum to ceramic surface.Under preferable case, ceramet
Change completes the element that can also continue to carry out that nickel plating, aluminum etc. do not affect to weld, strong with the machinery for strengthening welding position and base material to be welded
Degree.Transition metal ring plate can also be additionally provided between 32 outer face of buffer structure and connecting portion preferably, transition metal ring plate is used
The mechanical stress produced when buffering or reduce soldering.Transition metal ring plate can adopt it is common it is various easily with copper or copper alloy,
The metal material welded by aluminum or aluminum alloy, for example, can adopt kovar alloy, copper or copper alloy, aluminum or aluminum alloy.Transition
The maximum outside diameter of metal ring plate can be identical with the external diameter of the connecting portion 32 of ceramic seal 3, also can be different, and the present invention is not special
Limit.In the case of more preferably, transition metal ring plate surface can also carry out the element that nickel plating, aluminum etc. do not affect to weld, to strengthen weldering
Socket part position and the mechanical strength of base material to be welded.The welding procedure that Welding is commonly used for those skilled in the art, in the present invention not
Repeat again.By Welding, will can make the polar cap 21 of integrative-structure, i.e. electrode terminal at welding node, is formed with base material to be welded
Be welded into one between ceramic seal 3 structure, on the one hand ensures its sealing intensity, and the interface on the other hand reducing material is poor
It is different, so as to reduce the internal resistance of cover plate assembly, reduce battery-heating amount.
Ceramic seal 3 can for aluminium oxide ceramics ring, zirconia ceramicss ring, aluminium nitride ceramics ring, boron nitride ceramics ring,
One kind in silicon nitride ceramics ring, aluminium oxide and zirconic composite ceramic ceramic ring, preferred aluminium oxide ceramics ring, aluminium oxide and oxidation
The composite ceramic ceramic ring of zirconium, in the present embodiment, the aperture of the mesopore formed in the middle part of ceramic seal is 6.0 ± 0.1mm of ￠, thickness
For 2.5 ± 0.1mm.The decay resistance of ceramic seal is very good, will not be ensure that lithium ion battery by electrolytic corrosion
Service life；And the impact strength of ceramic seal, thermal shock resistance are better than vitreous body so that the structure of cover plate assembly
More stable, sealing effectiveness is more preferably；It is noted that using ceramic seal as sealing-in medium, compared to adopting ceramic wafer,
Its thickness is thicker, and thermal shock resistance and thermal circulation performance are more preferably.
Cover plate assembly can also contain electrode connecting piece 4, and electrode terminal 2 is drawn by electrode connecting piece 4 and pole piece conducting
Electric current, electrode connecting piece 4 are provided with the installing hole for installing electrode terminal, and the size and location present invention of installing hole is no to be limited,
Electrode terminal 2 according to installing is designed, and the installation of electrode terminal 2 can be extended ceramic seal 3 second
Weld in this installing hole, or 21 part of polar cap of electrode terminal 2 is welded in this installing hole in 222 part of pole
（As shown in Figure 8）, installing hole can be through electrode connection sheet 4 can not also insertion, according to the electrode terminal 2 which connects
Part be designed.Short circuit is generally prevented, insulation processing between cover board body 1 and electrode connecting piece 4, is needed, for example can be at him
Between be put into sealing ring, the sealing ring of the present invention refers to the seal member with sealing effectiveness, and its shape is not limited.This
Embodiment is specifically as follows the lower end that O-shaped sealing ring is set in ceramic seal, and the lower end of ceramic seal is coated on
In sealing ring, sealing ring can use the material insoluble in electrolyte such as PP or PE plastic rubber materials.
The concrete manufacture method of the cover plate assembly of the present embodiment, comprises the steps：
Step 1, two surfaces to the connecting portion of ceramic seal are metallized.
Step 2, the pole of electrode terminal is inserted in the mesopore of above-mentioned ceramic seal, mesopore, electrode are extended in end
The polar cap of terminal is mutually welded with the end face of the connecting portion of ceramic seal.In this step, the polar cap and ceramic seal of metal
Connecting portion adopt soldering processes or founding mutually to weld, the soldering processes need used below in base material metal fusing point
Scaling powder realizes welding, and founding then only need to be capable of achieving the connection of metal and ceramics, founding after fusing metal mother metal
The step of technique and parameter are also known to those skilled in the art.The solder adopted by soldering processes can for Al-Si alloys,
Al-Mg alloys, Al-Si-Mg alloys etc. are for welding ceramics and the solder of aluminum, in the preferred case, what soldering processes were adopted
Solder is Al-Si alloys, wherein, the content of Si is 0-12wt%, and the content of preferential Si is the balance of Al of 5-8wt% so that welding
It is better；The temperature of soldering processes is 570-625 DEG C, and atmosphere is vacuum or protective gas atmosphere, the protective gas atmosphere
Preferably nitrogen, argon, hydrogen and nitrogen mixed gas atmosphere.After brazing, scaling powder is formed between polar cap and connecting portion
Layer, polar cap are connected by the scaling powder layer with connecting portion.In the preferred case, the temperature of the founding is 600-
1300 DEG C, atmosphere is vacuum or inert gas atmosphere.
Step 3, the above-mentioned all-in-one-piece electrode terminal, ceramic seal of preparing is put in the through hole of cover board body, electrode
The electrode hole of the installation trench bottom that the sealing of the pole and ceramic seal of terminal is protruded through cover board body surface together, after
The connecting portion of ceramic seal is welded with mounting groove bottom interior surface, cover plate assembly is formed integrally into structure, welding can be
Physical weld method, physical weld method are electric resistance welding, Laser Welding or ultrasonic bond, for realizing the weldering between metal and metal
Connect, the processing step and parameter of electric resistance welding, Laser Welding or ultrasonic bond is known to those skilled in the art, and here is not done superfluous
State.
Step 4, the polar cap of electrode terminal in cover board body lower surface is snapped in the installing hole of electrode leading-out sheet, welded
Connect, welding can be physical weld method, and physical weld method is electric resistance welding, Laser Welding or ultrasonic bond, for realizing metal
Welding between metal, the processing step and parameter of electric resistance welding, Laser Welding or ultrasonic bond have been those skilled in the art institute
It is known, will not be described here.
Above-mentioned preparation method, can prepare an electrode terminal, it is also possible to prepare opposed polarity on a cover board body
Electrode terminal, the order of above-mentioned preparation method can be adjusted according to mounting means and welding temperature, general when electrode terminal is negative
During electrode terminal, directly can 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 will step
Rapid 2,3 merge, will the another welding after first assembling of electrode terminal, ceramic seal, cover board body opsition dependent relation.For example
When the electrode terminal containing both positive and negative polarity, can with initial reference to above-mentioned steps 1,2 by a kind of electrode terminal of polarity for example
Negative electrode terminal and ceramic seal are formed integrally structure, after integrative-structure is assembled with cover board body, referring again to step 1 will be another
A kind of ceramic seal surface metalation of the electrical terminal of polarity such as positive electrode terminal, after will positive electrode terminal, ceramics it is close
Sealing and cover board body assembling, referring again to step 3 carries out the welding of negative electrode terminal, positive electrode terminal.
When assembling whole lithium ion battery, for example：The one end open of housing, pole piece is positioned in housing, and to housing
Interior fluid injection, then the cover plate assembly that making has two electrode terminals is installed on the opening of housing, in this process, will
The periphery of cover plate assembly is mutually welded with housing, and the electrode leading-out sheet of cover plate assembly is connected with pole piece（Specifically, pole piece
Positive plate be connected with the electrode leading-out sheet being connected on one of electrode terminal by anode ear, the negative plate of pole piece passes through
Negative electrode lug is connected with the electrode leading-out sheet being connected on another electrode terminal, and concrete structure can be achieved by the prior art）, peace
After dress, sealing space between cover plate assembly and housing, is formed, pole piece and electrolyte, two electrode tips are contained in the sealing space
The two poles of the earth of son respectively as lithium ion battery, can external electrical equipment.
Again for example：It is open with the two ends of housing, is respectively mounted cover plate assembly, wherein a cover plate assembly is have anode electrode
The cover plate assembly of terminal, and another cover plate assembly be have the cover plate assembly of negative electrode terminal as a example by, by two cover plate assemblies
Two openings of housing are respectively arranged in, in the process, the periphery of two cover plate assemblies and housing are mutually welded, and should
Second pole of two cover plate assemblies is first welded with electrode connecting piece, and electrode connecting piece is connected with pole piece again（Specifically, pole
The positive plate of core is connected by the electrode connecting piece that anode ear is connected with the second pole of the cover plate assembly for having anode electrode terminal
Connect, the negative plate of pole piece passes through the electrode connecting piece that negative electrode lug is connected with the second pole of the cover plate assembly for having negative electrode terminal
It is connected, concrete structure can be achieved by the prior art）, after installation, this two form sealing sky between cover plate assembly and housing
Between, pole piece and electrolyte are contained in the sealing space, the stem stem of two cover plate assemblies is respectively as lithium ion battery
The two poles of the earth, can external electrical equipment.
The present invention adopts the electrode terminal with buffer structure, when electrode terminal is welded with insulating sealer, can be fine
Slow down different materials difference coefficient of expansion part produced larger stress in welding, reduce its shadow to cover plate assembly
Ring, specifically address the stress occurred when the different materials for differing greatly are welded causes the problem of the easy fragmentation of ceramic seal, carries
The high reliability of product, while the lithium battery of currently preferred ceramic seal cover plate assembly has the spy of ageing-resistant life-span length
Point, security performance are higher.The present invention preferably through hole contains the mounting groove on protrusion cover board body surface simultaneously, installs trench bottom and contains
Electrode hole, wherein, the pole of electrode terminal passes through above-mentioned electrode hole, can further solve insulating sealer and weld with cover board body
When stress, further improve cushioning effect.The electrode terminal of the present invention, cover plate assembly are easily prepared.The cover plate group of preparation
Part process is simple, easily welds, and the yield of product is high, and good stability is that the practical application of the battery of ceramic seal and development are established
Basis.
Those skilled in the art are readily apparent that, the foregoing is only presently preferred embodiments of the present invention, not to limit
The system present invention, all any modification, equivalent and improvement made within the spirit and principles in the present invention etc., should be included in
Within protection scope of the present invention.Protection scope of the present invention is determined by claims.
Claims (23)
1. a kind of cover plate assembly, it is characterised in that including cover board body, insulating sealer and electrode terminal；The electrode terminal
Including pole and the polar cap positioned at pole one end；The polar cap inner surface is provided with buffer structure；
The pole on the cover board body with the through hole through cover board body, the electrode terminal draws electricity through the through hole
Stream；
Insulating sealer insulated enclosure is clamped between the cover board body and electrode terminal；
The buffer structure is located between polar cap and insulating sealer；
The insulating sealer is ceramic seal, and the ceramic seal is centrally formed with mesopore, the pole of the electrode terminal
Post passes through the mesopore；
The ceramic seal includes the sealing being arranged in through hole and external diameter more than sealing and buffer structure and cover plate sheet
The connecting portion of body connection.
2. cover plate assembly according to claim 1, it is characterised in that the buffer structure is structure as a whole with polar cap.
3. cover plate assembly according to claim 1, it is characterised in that the buffer structure is support ring.
4. cover plate assembly according to claim 3, it is characterised in that the internal diameter of the support ring is outer more than or equal to polar cap
Footpath.
5. cover plate assembly according to claim 3, it is characterised in that external diameter of the external diameter of the support ring less than polar cap.
6. cover plate assembly according to claim 2, it is characterised in that sheet metal of the polar cap for thickness 0.5-1.0mm.
7. cover plate assembly according to claim 1, it is characterised in that the polar cap is height more than pole height 1/4, little
In the cylinder of pole height 1/2.
8. cover plate assembly according to claim 7, it is characterised in that the outer face periphery of the polar cap contains first leads
Angle.
9. cover plate assembly according to claim 1, it is characterised in that the pole includes two sections, contacted with polar cap
Section is the first pole, and another section is the second pole, and the external diameter of second pole is less than the first pole.
10. cover plate assembly according to claim 1, it is characterised in that the through hole contains protrusion cover board body surface
Mounting groove, the installation trench bottom contain electrode hole, and the pole of the electrode terminal passes through the electrode hole.
11. cover plate assemblies according to claim 10, it is characterised in that the periphery edge of the electrode hole contains second leads
Angle.
12. cover plate assembly according to claim 1, it is characterised in that the through hole contains protrusion cover board body surface
Mounting groove, the installation trench bottom contain electrode hole, and the ceramic seal includes the sealing being arranged in electrode hole and outer
Ease up the connecting portion for rushing that structure is connected more than sealing and installation trench bottom in footpath.
13. cover plate assemblies according to claim 12, it is characterised in that the connecting portion is in through hole.
14. cover plate assemblies according to claim 12, it is characterised in that the connecting portion and the inner surface for installing trench bottom
Between be provided with the first metallic solder layer, first metallic solder layer by metallizing to connecting portion surface after again with installation
Formed by Welding between the inner surface of trench bottom.
15. cover plate assemblies according to claim 12, it is characterised in that the connecting portion and the inner surface for installing trench bottom
Between be additionally provided with transition metal ring.
16. cover plate assemblies according to claim 1 or 12, it is characterised in that the buffer structure and connecting portion outer face
Between be provided with the second metallic solder layer, second metallic solder layer by metallizing to connecting portion outer face after again with it is slow
Rush.
17. cover plate assemblies according to claim 1 or 12, it is characterised in that the buffer structure and connecting portion outer face
Between be additionally provided with transition metal ring plate.
18. cover plate assemblies according to claim 1, it is characterised in that the pole includes two sections, contacted with polar cap
Section is the first pole, and another section is the second pole, and less than the first pole, first pole wears the external diameter of second pole
In the mesopore of ceramic seal, and the second pole extends ceramic seal together.
19. cover plate assemblies according to claim 18, it is characterised in that the cover plate assembly also includes electrode connecting piece,
There is in the electrode connecting piece installing hole for installing electrode terminal, second pole is installed in the installing hole.
20. cover plate assemblies according to claim 10, it is characterised in that the cover plate assembly also includes electrode connecting piece,
There is in the electrode connecting piece installing hole for installing electrode terminal, the polar cap is installed in the installing hole.
21. cover plate assemblies according to claim 19 or 20, it is characterised in that between the cover board body and electrode connecting piece
It is provided with sealing ring.
22. cover plate assemblies according to claim 10, it is characterised in that the number of the electrode terminal is for multiple, described
There are on cover board body multiple through holes.
A kind of 23. batteries, including：Cover plate assembly, battery container, pole piece and electrolyte, pole piece and electrolyte level are in battery container
Interior, cover plate assembly is tightly connected with battery container；Electrode terminal on the cover plate assembly draws inside battery with pole piece conducting
Electric current, it is characterised in that the cover plate assembly is the cover plate assembly described in claim 1-22 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 |
| EP12803624.1A EP2727174B1 (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 |
| PCT/CN2012/077670 WO2013000415A1 (en) | 2011-06-28 | 2012-06-27 | Electrode terminal, 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 |
| 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 |
|---|---|
| CN103378343A CN103378343A (en) | 2013-10-30 |
| CN103378343B true CN103378343B (en) | 2017-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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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| Country | Link |
|---|---|
| CN (1) | CN103378343B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647031B (en) * | 2013-12-06 | 2016-01-13 | 广州力柏电动科技有限公司 | A kind of battery insulation hermetically-sealed construction |
| CN107123784B (en) * | 2016-02-25 | 2021-01-08 | 比亚迪股份有限公司 | Single battery, battery module, power battery and electric automobile |
| CN106410107A (en) * | 2016-11-29 | 2017-02-15 | 深圳市长盈精密技术股份有限公司 | Power battery cover plate and battery polar post assembly thereof |
| CN108428819B (en) * | 2017-02-14 | 2020-07-24 | 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 |
| CN113991229B (en) * | 2021-10-25 | 2023-08-04 | 芜湖天弋能源科技有限公司 | Lithium battery pack and assembly 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 |
| EP4300654A1 (en) * | 2022-05-16 | 2024-01-03 | Contemporary Amperex Technology Co., Limited | End cover, battery cell, battery, and electric device |
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| US5856041A (en) * | 1995-10-20 | 1999-01-05 | Matsushita Electric Industrial Co., Ltd. | Sealed secondary cell |
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| GB1274657A (en) * | 1968-10-11 | 1972-05-17 | Lucas Industries Ltd | Electric storage batteries |
| JP3366533B2 (en) * | 1996-09-26 | 2003-01-14 | 松下電器産業株式会社 | Sealed secondary battery |
| JP3717684B2 (en) * | 1998-10-30 | 2005-11-16 | 三洋電機株式会社 | Cylindrical secondary battery |
| US6268079B1 (en) * | 1998-11-25 | 2001-07-31 | Japan Storage Battery Co., Ltd. | Nonaqueous-electrolyte battery |
| US6610444B2 (en) * | 2000-09-29 | 2003-08-26 | Sanyo Electric Co., Ltd. | Secondary cell with non-rotatable terminal member |
| JP2003045046A (en) * | 2001-07-30 | 2003-02-14 | Matsushita Electric Ind Co Ltd | Optical head driving method and device therefor in disk device |
| CN201584439U (en) * | 2009-06-12 | 2010-09-15 | 千如电机工业股份有限公司 | Modified structure of secondary battery end cover |
| CN201663140U (en) * | 2010-04-20 | 2010-12-01 | 安徽华东光电技术研究所 | Sealing structure for ceramics and metal pin |
| JP2012059365A (en) * | 2010-09-03 | 2012-03-22 | Sanyo Electric Co Ltd | Terminal for sealed battery and method of manufacturing the same |
| CN102074676B (en) * | 2010-12-31 | 2016-04-20 | 东莞新能源科技有限公司 | Electrokinetic cell |
| CN202616327U (en) * | 2012-04-20 | 2012-12-19 | 比亚迪股份有限公司 | Electrode terminal, cover plate component and battery containing same |
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| US5856041A (en) * | 1995-10-20 | 1999-01-05 | Matsushita Electric Industrial Co., Ltd. | Sealed secondary cell |
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