CN102738507B - Full-sealed anti-corrosion integrated welded lithium ion battery - Google Patents
Full-sealed anti-corrosion integrated welded lithium ion battery Download PDFInfo
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- CN102738507B CN102738507B CN201210257218.6A CN201210257218A CN102738507B CN 102738507 B CN102738507 B CN 102738507B CN 201210257218 A CN201210257218 A CN 201210257218A CN 102738507 B CN102738507 B CN 102738507B
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- cover plate
- pole
- sealing gasket
- full
- hermetically sealed
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/198—Sealing members characterised by the material characterised by physical properties, e.g. adhesiveness or hardness
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
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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
Abstract
The invention relates to a full-sealed anti-corrosion integrated welded lithium ion battery, comprising a battery core, a full-sealed cover plate, a full-sealed bush and a shell, wherein the full-sealed cover plate is arranged at the top of the battery core and is connected with the battery core; the full-sealed liner is provided with a top opening; the battery core is sleeved into the full-sealed bush from the top opening, namely, the full-sealed bush completely covers the bottom and the periphery of the battery core; the shell is provided with a top opening; the battery core covered by the full-sealed liner is sleeved into the shell from the top opening of the shell; and the shell is connected with the full-sealed cover plate through welding. According to the full-sealed anti-corrosion integrated welded lithium ion battery, the full sealing of the inner part of the battery is realized, so that electrolyte cannot be contacted with the shell or the cover plate in a liquid injection process; and therefore, the insulation resistance of the shell is enhanced and the safety of the battery is improved.
Description
Technical field
The present invention relates to a kind of lithium ion battery, refer in particular to a kind of weldedization lithium ion battery of full-sealed corrosion-resistant, belong to technical field of lithium ion.
Background technology
Electrokinetic cell group system often relates to the voltage of several hectovolts, therefore in the time of assembling, need to accomplish mutual insulating between every joint cell, to avoid high pressure to be directly loaded into the potential safety hazard of bringing between pole and housing.Because there is the electrolyte of free state between pole and housing, thereby high pressure is loaded into and on housing, can causes electrolyte to be ionized causing that electrolyte decomposition produces gas, cause battery inflatable, and severe patient can moment arc through cause fiery fried danger.But metal-back battery cell insulating treatment process complexity, cost is higher and have failure risk, so if can completely cut off electrolyte and housing, if namely battery container is realized " zero " voltage, the fail safe that just can greatly improve battery pack system.
Traditional metal-back battery on the cover board has liquid injection port and safety valve simultaneously, and liquid injection port directly goes out small-bore circular hole on metal cover board, must cause electrolyte to contact with cover plate when fluid injection like this.And often adopt the mode of pressurized liquid injection or vacuum pumping liquid injection in order to control the fluid injection time, cause electrolyte to gather in battery upper cavity, cause electrolyte to infiltrate in cover plate gap, will make like this housing and pole by electrolyte conducting, cause three current potentials of positive pole-electrolyte-housing-electrolyte-negative pole.In the time using aluminium as shell material, also may cause electrochemical corrosion.And because metal shell, with empty electricity, so must will fully carry out insulation processing between each cell while forming module, avoids the high pressure of series battery generation directly by electrolyte ionization.The insulation impedance of power battery case pole rod also reduces greatly because of electrolyte conducting simultaneously, and these have also limited the application of metal-back battery greatly all by the fail safe of appreciable impact battery pack.Traditional flexible-packed battery is because the nylon layer of shell metallized aluminum plastic film has fabulous insulating properties and assembling, but the sealing of the aluminum plastic film of flexible-packed battery is to adopt heat-sealing technology, its sealing is difficult to reach above user demand in 3 years, can not meet long-time, large electric current, the demand using under mal-condition.
What the pole connected mode of metal-back battery generally adopted is thread connecting mode, this mechanical connection manner screws pole by nut and compresses jumper, it has good assembling, but battery pack moment of torsion control in assembling process is loaded down with trivial details, and need to use the additional attachments such as bullet pad, plain cushion or stop nut, so also increase the weight of whole system.Thereby adopt the mode that is threaded of pole may cause nut/jumper contact-making surface to become loosening or corrosion and cause that internal resistance increases and cause battery inconsistent in complicated operating mode, affect the systemic circulation life-span.Therefore the battery assembling mode of developing weldedization is also recent research emphasis, but for electrokinetic cell, because need high current charge-discharge, so general jumper thickness all exceedes 1mm, the connected mode of the resistance electric welding of the battery pack that electric bicycle field is used is difficult to meet the demand of welding slab jumper, and adopts other welding manners all to face the difficulty of copper, aluminium welding such as ultrasonic bond or laser welding.
Traditional cover plate design concentrates on electrode column sealing, as Chinese patent application 201010212781.2, publication number CN102299292A discloses power lithium battery top cover electrode column and has been tightly connected and manufactures assembly method, electrode column and the seal washer of design with the conical surface, utilize conical surface effect to make sealing ring radially produce strain, in the time that locking nut is locked, reach the object of electrode column sealing, but this kind of mode can not solve the charged problem of metal-back battery.Chinese patent 200920116889.4, notification number CN201387896Y discloses a kind of explosion-proof hermetic lithium battery casing, battery electrode column is tightly connected and is integrated by compressive seal and cell cover, battery electrode column center is provided with liquid injection hole, under battery, be covered with explosion-proof relief mechanism, this cover plate is positioned over liquid injection port on pole, can not contact cover plate at fluid injection initial stage electrolyte, but along with electrolyte injection rate increases gradually, inside battery pressure increases, electrolyte can be filled into cover plate gap, and do not have sealing gasket in cover plate inside by cover plate and electrolyte isolation.
The patent of more than enumerating is all mainly for battery electrode column sealing aspect, do not relate to the hermetically sealed of inside battery, for metal casing lithium ion battery, still there is the potential safety hazard that housing insulation impedance is low, and increased cell height owing to using pole to be threaded, may cause that the internal resistance being threaded is large, the defect of Cycle Difference.
Summary of the invention
The object of this invention is to provide a kind of weldedization lithium ion battery of full-sealed corrosion-resistant, by changing traditional liquid injection port design, increase liquid injection port sealant fluid injection parts and cover plate are separated; Use sealing gasket isolation electrolyte and cover plate; Use contacting of the isolated electrolyte of hermetically sealed lining and housing, inside battery is realized hermetically sealed, greatly improve battery security; Adopt in addition conductive aluminum as pole and jumper, adopt laser welding process to be connected to form battery pack, reduce battery pack internal resistance, improve consistency of battery pack and service life cycle.
For achieving the above object, the invention provides a kind of weldedization lithium ion battery of full-sealed corrosion-resistant, it comprises: battery core; Hermetically sealed cover plate, it is arranged on described battery core top and is connected with described battery core; Hermetically sealed lining, it has an open top, and described battery core is inserted in described hermetically sealed lining by this open top place, i.e. described hermetically sealed lining completely coated battery core bottom and surrounding; Housing, it has an open top, described in be coated with hermetically sealed lining battery core be inserted in described housing by this top open part, between described housing and described hermetically sealed cover plate by being welded to connect; Wherein, described hermetically sealed cover plate comprises: be fixed on respectively the pole of hermetically sealed cover plate end face both sides by riveted joint, using the positive pole as lithium ion battery and negative pole; Be fixedly installed between described two poles and vertically run through the fluid injection parts of cover plate, between itself and cover plate, by riveting, between described cover plate and fluid injection parts, being provided with liquid injection port sealant; Insertion is arranged in described fluid injection parts and the safety valve being fixedly connected with these fluid injection parts; Be fixed on the sealing gasket of described cover plate bottom surface by riveted joint; Described pole adopts conductive aluminum material by the welded type that changes into, and is provided with the flat rank of pole and pole socket on this pole; The thickness of described pole socket is identical with the jumper thickness that adopts conductive aluminum material to make, for inserting and locate this jumper; The flat rank of described pole are used for the jumper that aligns; Adopt the weld seam between the laser welding process welding flat rank of pole and jumper, make to be fixedly connected with between jumper and pole; Between the open top side of described hermetically sealed lining and described sealing gasket, be tightly connected.
On described pole, by riveting or weld signalization sampling terminal, or by reserving installation hole on pole, signal sampling terminal is installed.
Between described pole and cover plate, be provided with pole insulating barrier, this pole insulating barrier is formed on the end face and bottom surface of cover plate by injection moulding.
Described fluid injection parts have a fluid injection inner chamber, above described fluid injection inner chamber, offer liquid injection port, on the inwall of this liquid injection port, are provided with internal thread; Described liquid injection port sealant is arranged between described liquid injection port exterior circumferential and cover plate, and this liquid injection port sealant forms on the cover board by injection moulding.
On the outer wall of described safety valve, be provided with the external screw thread matching with the internal thread of liquid injection port, described safety valve inserts in liquid injection port and by achieving a fixed connection between screw thread and fluid injection parts; Between described safety valve and liquid injection port, be provided with sealing ring; The center of described safety valve offers pressure release through hole, is fixedly installed rupture pressure disc in inside or the outside of described pressure release through hole by the mode of welding or riveting.
The thickness of described sealing gasket is 4～5mm, adopts the insulating material of polypropylene, polyethylene or polytetrafluoroethylene to make; Sealing pad riveted joint is fixed on the bottom surface of described hermetically sealed cover plate, and compresses described liquid injection port sealant and injection moulding is formed on the pole insulating barrier on hermetically sealed cover plate bottom surface; Described sealing gasket is in the contact site of itself and liquid injection port sealant, and is provided with in the contact site of itself and pole insulating barrier the sealing gasket step that matches; The centre of described sealing gasket offers sealing gasket liquid injection port, and it mates with described fluid injection bore seal and passes through riveting; The height of sealing pad liquid injection port is higher than the thickness of sealing gasket, and higher than the degree of depth of fluid injection inner chamber; The two ends, bottom of described sealing gasket are also provided with some sealing gasket slots.
Described cover plate also comprises the brace that is fixed on sealing gasket bottom by riveted joint, and the two side portions that described brace exposes cover plate is bent into vertical with described cover plate, and this brace and described battery core realize being connected of cover plate and battery core by being welded to connect; Between described brace and sealing gasket, be also provided with locating piece.
Vibrationproof clasp is installed in the top outer of described battery core, and it is located by the sealing gasket slot on described sealing gasket, and adopts clasp snap lock.
Described hermetically sealed lining adopts the technique of injection moulding or plastics sucking moulding one-body molded, and thickness is 0.1～0.2mm, adopts the insulating material of polypropylene, polyethylene or polytetrafluoroethylene to make; Between the open top side of this hermetically sealed lining and described sealing gasket, adopt the techniques such as heat-sealing, hot pressing or super weldering to carry out hermetically sealed connection.
Described housing adopts the composite of aluminium material, stainless steel, magnesium material, titanium alloy material or above-mentioned each metal material to make.
In sum, the weldedization lithium ion battery of full-sealed corrosion-resistant provided by the present invention, its inside battery is realized hermetically sealed, and while making fluid injection, electrolyte cannot come in contact with housing or cover plate, also just increased the insulation impedance of housing, the fail safe that has improved battery.
1, between cover plate and fluid injection parts, liquid injection port sealant is set, and hermetically sealed by adopting sealing gasket to realize cover plate; Further realize the hermetically sealed of inside battery by heat-sealing or the super weldering of hermetically sealed lining and sealing gasket, improved the fail safe of metal shell battery.
2, adopt the conductive aluminum of easily weldering as pole and jumper, avoid copper, aluminium in conventional art to weld difficult problem, adopted the connected mode of laser welding to form battery pack, be conducive to reduce battery pack internal resistance, promote the consistency of battery pack each monomer, extend battery pack useful life.
3, safety valve and fluid injection parts, with mouthful arranging, have been saved the space on cover plate, have reduced cost, and safety valve can for convenience detachly be conducive to remain silent and change into combustion gas, thereby have simplified processing step.
Brief description of the drawings
Fig. 1 is the structural representation of the weldedization lithium ion battery of full-sealed corrosion-resistant of the present invention;
Fig. 2 is the top surface structure schematic diagram of the hermetically sealed cover plate in the present invention;
Fig. 3 is the bottom surface structure schematic diagram of the hermetically sealed cover plate in the present invention;
Fig. 4 is the cross-sectional view of the hermetically sealed cover plate in the present invention;
Fig. 5 is the structural representation of the pole in the present invention;
Fig. 6 is the top surface structure schematic diagram of the sealing gasket in the present invention;
Fig. 7 is the bottom surface structure schematic diagram of the sealing gasket in the present invention;
Fig. 8 is fluid injection parts in the present invention and the cross-sectional view of safety valve;
Fig. 9 is battery core in the present invention and the assembling schematic diagram of hermetically sealed lining;
Figure 10 is the structural representation of the vibrationproof clasp in the present invention.
Embodiment
Below in conjunction with Fig. 1～Figure 10, describe a preferred embodiment of the present invention in detail.
As shown in Figure 1, be the structural representation of the weldedization lithium ion battery of full-sealed corrosion-resistant provided by the invention.This lithium ion battery comprises: battery core; Hermetically sealed cover plate 1, it is arranged on described battery core top and is connected with described battery core; Hermetically sealed lining 2, it has an open top, and described battery core is inserted in described hermetically sealed lining 2 by this open top place, i.e. described hermetically sealed lining 2 completely coated battery core bottom and surrounding (referring to Fig. 9); Housing 9, it has an open top, described in be coated with hermetically sealed lining 2 battery core be inserted in described housing 9 by this top open part, between described housing 9 and described hermetically sealed cover plate by being welded to connect.
As shown in Figure 2, Figure 3 and Figure 4, described hermetically sealed cover plate 1(is hereinafter to be referred as cover plate 1) comprise: be fixedly installed on respectively cover plate 1 end face both sides pole 3, using the positive pole as lithium ion battery and negative pole; Be fixedly installed between described two poles 3 and vertically run through the fluid injection parts 4 of cover plate 1, between described cover plate 1 and fluid injection parts 4, being provided with liquid injection port sealant 41; Insertion is arranged in described fluid injection parts 4 and the safety valve 5 being fixedly connected with these fluid injection parts 4; Be fixedly installed on the sealing gasket 6 of described cover plate 1 bottom surface.
As shown in Fig. 2, Fig. 4 and Fig. 5, described pole 3 adopts and easily welds conductive aluminum material by the welded type that changes into, and it is fastened on the end face both sides of cover plate 1 by rivet 34.On described pole 3, be provided with the flat rank 31 of pole and pole socket 32; The thickness of this pole socket 32 adopts the jumper thickness that easily weldering conductive aluminum material is made identical with same, for inserting and locate this jumper; The flat rank 31 of described pole are for the jumper that aligns; Adopt the weld seam between the laser welding process welding flat rank 31 of pole and jumper, realize being fixedly connected with between jumper and pole 3, thereby realize the connection between some joint lithium ion batteries and form battery pack, can improve the volumetric specific energy of single-unit lithium ion battery, effectively avoid conventional negative pole copper and aluminium to weld difficult problem.And, owing to adopting the pole of said structure, in manufacture process, can strengthen the thickness of jumper to realize large current flowing, avoid traditional resistor spot welding can only lead to the connected mode of too little current.The connected mode that adopts weldedization in the time connecting some joint lithium ion batteries, can significantly reduce battery pack internal resistance, improves and strengthen battery pack circulation consistency, extends the useful life of battery pack system.
Further, on described pole 3 by riveting or weld signalization sampling terminal 33, or by reserving installation hole on pole 3, this signal sampling terminal 33 is installed, when some joint lithium ion batteries connect into after battery pack, described signal sampling terminal 33, as the interfaces of connecting wires of the voltage data of the every joint lithium ion battery of collection, is realized the signals collecting to the every joint cell in battery pack then.In addition, between described pole 3 and cover plate 1, be also provided with pole insulating barrier 11, this pole insulating barrier 11 is formed on by injection moulding on the end face and bottom surface of cover plate 1 (as shown in Figure 4).
As shown in Figure 4 and Figure 8, between described fluid injection parts 4 and cover plate 1, pass through riveting.Described fluid injection parts 4 have a fluid injection inner chamber 42, and this fluid injection inner chamber 42 has large fluid injection aperture, are conducive to electrolyte unobstructed inflow battery core fast when fluid injection in battery core; Above described fluid injection inner chamber 42, offer liquid injection port 43.Described liquid injection port sealant 41 is arranged between described liquid injection port 43 exterior circumferential and cover plate 1, this liquid injection port sealant 41 is formed on cover plate 1 by upper and lower integrated injection molding, utilize this liquid injection port sealant 41 to separate fluid injection parts 4 and cover plate 1, avoid in battery core when fluid injection electrolyte infiltrate cover plate 1.
On the inwall of described liquid injection port 43, be provided with internal thread, on the outer wall of described safety valve 5, be provided with the external screw thread matching with the internal thread of liquid injection port 43.As shown in Figure 8, described safety valve 5 inserts in liquid injection port 43 and by achieving a fixed connection between screw thread and fluid injection parts 4.Between described safety valve 5 and liquid injection port 43, further adopt sealing ring to seal.The center of described safety valve 5 also offers pressure release through hole, is fixedly installed rupture pressure disc 51 in inside or the outside of described pressure release through hole by the mode of welding or riveting, and changes into realize remaining silent in order to dismantle safety valve 5.
As shown in Fig. 4, Fig. 6 and Fig. 7, the thickness of described sealing gasket 6 is preferably 4～5mm, to reach heat sealing machine pressure head or the super soldering equipment soldering tip that coupling is suitable; Sealing pad 6 preferably adopts PP(polypropylene), PE(polyethylene) or PTFE(polytetrafluoroethylene) etc. the insulating material of high-quality high-strength corrosion-resisting.Described sealing gasket 6 utilizes rivet 34 to be fixedly connected on the bottom surface of described cover plate 1, it compresses described liquid injection port sealant 41 and injection moulding is formed on the pole insulating barrier 11 on cover plate 1 bottom surface, be diffused into the effect on cover plate 1 with isolated electrolyte after playing fluid injection, make cover plate 1 there is hermetically sealed performance.Described sealing gasket 6 is in the contact site of itself and liquid injection port sealant 41, and be provided with and match sealing gasket step 61(as shown in Figure 7 in the contact site of itself and pole insulating barrier 11), to strengthen the sealing effectiveness between sealing gasket 6 and liquid injection port sealant 41 and pole insulating barrier 11.The centre of described sealing gasket 6 offers sealing gasket liquid injection port 62, and it mates with 42 sealings of described fluid injection inner chamber and passes through riveting; The height of described sealing gasket liquid injection port 62 is higher than the thickness of sealing gasket 6, and higher than the degree of depth of fluid injection inner chamber 42, is back to the circulation path on cover plate 1 to increase electrolyte.The two ends, bottom of described sealing gasket 6 are also provided with some sealing gasket slots 63.
As shown in Fig. 1, Fig. 9 and Figure 10; vibrationproof clasp 7 is also installed in the top outer of described battery core; it is located by the sealing gasket slot 63 on described sealing gasket 6; and use clasp buckle 71 to lock; in order to protect battery core and to play antivibration and effect of insulation; make battery core in vibration processes, reduce the vibration displacement of vertical direction, strengthen the vibration resistance of battery core.
As shown in Figure 3 and Figure 4, described cover plate 1 also comprises the brace 8 that is fixedly connected on sealing gasket 6 bottoms by rivet 34, the two side portions that described brace 8 is exposed to cover plate 1 is bent into vertical with described cover plate 1, and described brace 8 and described battery core are realized being connected of cover plate 1 and battery core by being welded to connect.Between described brace 8 and sealing gasket 6, be also provided with locating piece 81, because described sealing gasket 6 has certain thickness, when after the pole insulating barrier 11 interlocks sealings of itself and cover plate 1 bottom surface, by locating piece 81 compactings, and fill up sealing gasket 6 inside and make to rivet rear connecting piece 8 and can not produce distortion.Specifically as shown in Figure 4, described pole 3, pole insulating barrier 11, cover plate 1, sealing gasket 6, locating piece 81 and brace 8 adopt two rivets 34 to realize riveting.
As shown in Figure 9, described hermetically sealed lining 2 adopts the technique of injection moulding or plastics sucking moulding one-body molded, this hermetically sealed lining 2 is except having an open top for putting into battery core, all the other positions seal completely, the thickness of this hermetically sealed lining 2 is preferably 0.1～0.2mm, material is identical with described sealing gasket 6, preferably adopts the insulating material of the high-quality high-strength corrosion-resistings such as PP, PE or PTFE.Described battery core top is completed and is welded and install after vibrationproof clasp 7 by brace 8 and cover plate 1, is put into until bottom and the surrounding of the completely coated battery core of this hermetically sealed lining 2 by the open top place of hermetically sealed lining 2.Between the open top side of described hermetically sealed lining 2 and described sealing gasket 6, adopt the techniques such as heat-sealing, hot pressing or super weldering to be connected, pressure head or soldering tip track are overlapping, ensure that with this hermetically sealed lining 2 and sealing gasket 6 realize sealing completely, make whole battery core inside reach hermetically sealed; can there is not electrolyte and touch metal shell 9 in this lithium ion battery in fluid injection process and use procedure, thereby realize metal shell 9 and ensure " zero " voltage, and avoid the housing corrosion causing because of electrolyte conducting, increased insulation impedance, greatly improved fail safe.
Described housing 9 is metal shell, and it preferably adopts the composite of lightweight heat conduction aluminum material, stainless steel, magnesium material, titanium alloy material or above-mentioned each metal material to make.Because the present invention can realize completely isolated between electrolyte and metal shell 9, therefore can avoid metal shell 9 to be corroded.
Below describe the assembling process of the weldedization lithium ion battery of full-sealed corrosion-resistant provided by the present invention in detail.First, on cover plate 1, injection moulding forms pole insulating barrier 11 and liquid injection port sealant 41; Welded pole 3, fluid injection parts 4, sealing gasket 6, brace 8 and the locating piece 81 that changes into type is fixed on cover plate 1 by rivet 34 riveted joints, the sealing gasket liquid injection port 62 of described sealing gasket 6 is mated with 42 sealings of the fluid injection inner chamber of fluid injection parts 4, and strengthen the sealing effectiveness between sealing gasket 6 and liquid injection port sealant 41 and pole insulating barrier 11 by sealing gasket step 61, hermetically sealed to realize cover plate 1.The two side portions of first described brace 8 being exposed to cover plate 1 is subsequently bent into vertical with described cover plate 1, realize being connected between hermetically sealed cover plate 1 and battery core by being welded to connect sheet 8 and battery core again, and utilize sealing gasket slot 63 to locate vibrationproof clasp 7, vibrationproof clasp 7 to be installed in the top outer of described battery core to reduce battery vibration risk.Then use hermetically sealed lining 2 coated whole battery core bottom and surrounding, and by between the open top side of hermetically sealed lining 2 and sealing gasket 6 by sealing or super weldering realized inside battery and sealed completely.Further housing 9 is set in to the battery core outside that has been coated hermetically sealed lining 2, and by being welded to connect housing 9 and cover plate 1.Then in battery core, inject electrolyte by the liquid injection port 43 of fluid injection parts 4, after completing, screw safety valve 5 and change into, the waste gas that the 5 discharge inside batteries that open the safety-valve after end to be changed produce, thus complete assembling and the manufacture of monomer lithium ion battery.Follow by locate and weld jumper on pole 3, thereby realize the connection of multiple monomer lithium ion batteries, thereby form battery pack.
In sum, the weldedization lithium ion battery of full-sealed corrosion-resistant provided by the present invention, its inside battery is realized hermetically sealed, and while making fluid injection, electrolyte cannot come in contact with housing or cover plate, also just increased the insulation impedance of housing, the fail safe that has improved battery.The present invention has following beneficial effect.
1, between cover plate and fluid injection parts, liquid injection port sealant is set, and hermetically sealed by adopting sealing gasket to realize cover plate; Further realize the hermetically sealed of inside battery by heat-sealing or the super weldering of hermetically sealed lining and sealing gasket, improved the fail safe of metal shell battery.
2, adopt the conductive aluminum of easily weldering as pole and jumper, avoid copper, aluminium in conventional art to weld difficult problem, adopted the connected mode of laser welding to form battery pack, be conducive to reduce battery pack internal resistance, promote the consistency of battery pack each monomer, extend battery pack useful life.
3, safety valve and fluid injection parts, with mouthful arranging, have been saved the space on cover plate, have reduced cost, and safety valve can for convenience detachly be conducive to remain silent and change into combustion gas, thereby have simplified processing step.
Although content of the present invention has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.Read after foregoing those skilled in the art, for multiple amendment of the present invention and substitute will be all apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (10)
1. weldedization of a full-sealed corrosion-resistant lithium ion battery, is characterized in that, comprises:
Battery core;
Hermetically sealed cover plate (1), it is arranged on described battery core top and is connected with described battery core;
Hermetically sealed lining (2), it has an open top, and described battery core is inserted in described hermetically sealed lining (2) by this open top place, i.e. described hermetically sealed lining (2) completely coated battery core bottom and surrounding;
Housing (9), it has an open top, described in be coated with hermetically sealed lining (2) battery core be inserted in described housing (9) by this top open part, between described housing (9) and described hermetically sealed cover plate by being welded to connect;
Wherein, described hermetically sealed cover plate (1) comprises:
Be fixed on respectively the pole (3) of hermetically sealed cover plate (1) end face both sides by riveted joint, using the positive pole as lithium ion battery and negative pole;
Be fixedly installed between described two poles (3) and vertically run through the fluid injection parts (4) of cover plate (1), between itself and cover plate (1), by riveting, between described cover plate (1) and fluid injection parts (4), being provided with liquid injection port sealant (41);
Insertion is arranged in described fluid injection parts (4) and the safety valve (5) being fixedly connected with these fluid injection parts (4);
Be fixed on the sealing gasket (6) of described cover plate (1) bottom surface by riveted joint; Between the open top side of described hermetically sealed lining (2) and described sealing gasket (6), be tightly connected;
Described pole (3) adopts conductive aluminum material by the welded type that changes into, and is provided with the flat rank of pole (31) and pole socket (32) on this pole (3);
The thickness of described pole socket (32) is identical with the jumper thickness that adopts conductive aluminum material to make, for inserting and locate this jumper;
The flat rank of described pole (31) are for the jumper that aligns;
Adopt the weld seam between the laser welding process welding flat rank of pole (31) and jumper, make to be fixedly connected with between jumper and pole (3).
2. weldedization of full-sealed corrosion-resistant as claimed in claim 1 lithium ion battery, it is characterized in that, upper by riveting or weld signalization sampling terminal (33) at described pole (3), or by signal sampling terminal (33) being installed at the upper reserving installation hole of pole (3).
3. weldedization of full-sealed corrosion-resistant as claimed in claim 2 lithium ion battery, it is characterized in that, between described pole (3) and cover plate (1), be provided with pole insulating barrier (11), this pole insulating barrier (11) is formed on the end face and bottom surface of cover plate (1) by injection moulding.
4. weldedization of full-sealed corrosion-resistant as claimed in claim 3 lithium ion battery, it is characterized in that, described fluid injection parts (4) have a fluid injection inner chamber (42), offer liquid injection port (43) in the top of described fluid injection inner chamber (42), on the inwall of this liquid injection port (43), be provided with internal thread;
Described liquid injection port sealant (41) is arranged between described liquid injection port (43) exterior circumferential and cover plate (1), and this liquid injection port sealant (41) is formed on cover plate (1) by injection moulding.
5. weldedization of full-sealed corrosion-resistant as claimed in claim 4 lithium ion battery, it is characterized in that, on the outer wall of described safety valve (5), be provided with the external screw thread matching with the internal thread of liquid injection port (43), described safety valve (5) inserts in liquid injection port (43) and by achieving a fixed connection between screw thread and fluid injection parts (4);
Between described safety valve (5) and liquid injection port (43), be provided with sealing ring;
The center of described safety valve (5) offers pressure release through hole, is fixedly installed rupture pressure disc (51) in inside or the outside of described pressure release through hole by the mode of welding or riveting.
6. weldedization of full-sealed corrosion-resistant as claimed in claim 4 lithium ion battery, is characterized in that, the thickness of described sealing gasket (6) is 4～5mm, adopts the insulating material of polypropylene, polyethylene or polytetrafluoroethylene to make;
Described sealing gasket (6) riveted joint is fixed on the bottom surface of described hermetically sealed cover plate (1), and compresses described liquid injection port sealant (41) and injection moulding is formed on the pole insulating barrier (11) on hermetically sealed cover plate (1) bottom surface;
Described sealing gasket (6) is in the contact site of itself and liquid injection port sealant (41), and is provided with in the contact site of itself and pole insulating barrier (11) the sealing gasket step (61) that matches;
The centre of described sealing gasket (6) offers sealing gasket liquid injection port (62), and it mates with described fluid injection inner chamber (42) sealing and passes through riveting; The height of sealing pad liquid injection port (62) is higher than the thickness of sealing gasket (6), and higher than the degree of depth of fluid injection inner chamber (42);
The two ends, bottom of described sealing gasket (6) are also provided with some sealing gasket slots (63).
7. weldedization of full-sealed corrosion-resistant as claimed in claim 6 lithium ion battery, it is characterized in that, described cover plate (1) also comprises the brace (8) that is fixed on sealing gasket (6) bottom by riveted joint, the two side portions that described brace (8) exposes cover plate (1) is bent into vertical with described cover plate (1), and this brace (8) and described battery core realize being connected of cover plate (1) and battery core by being welded to connect;
Between described brace (8) and sealing gasket (6), be also provided with locating piece (81).
8. weldedization of full-sealed corrosion-resistant as claimed in claim 6 lithium ion battery, it is characterized in that, vibrationproof clasp (7) is installed in the top outer of described battery core, and it is located by the sealing gasket slot (63) on described sealing gasket (6), and adopts clasp buckle (71) locking.
9. weldedization of full-sealed corrosion-resistant as claimed in claim 6 lithium ion battery, it is characterized in that, described hermetically sealed lining (2) adopts the technique of injection moulding or plastics sucking moulding one-body molded, thickness is 0.1～0.2mm, adopts the insulating material of polypropylene, polyethylene or polytetrafluoroethylene to make;
Between the open top side of this hermetically sealed lining (2) and described sealing gasket (6), adopt the technique of heat-sealing, hot pressing or super weldering to carry out hermetically sealed connection.
10. weldedization of full-sealed corrosion-resistant as claimed in claim 1 lithium ion battery, is characterized in that, described housing (9) adopts the composite of aluminium material, stainless steel, magnesium material, titanium alloy material or above-mentioned each metal material to make.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210257218.6A CN102738507B (en) | 2012-07-24 | 2012-07-24 | Full-sealed anti-corrosion integrated welded lithium ion battery |
| PCT/CN2012/001254 WO2014015451A1 (en) | 2012-07-24 | 2012-09-11 | Fully-sealed corrosion-resistant integrally welded lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210257218.6A CN102738507B (en) | 2012-07-24 | 2012-07-24 | Full-sealed anti-corrosion integrated welded lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102738507A CN102738507A (en) | 2012-10-17 |
| CN102738507B true CN102738507B (en) | 2014-07-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210257218.6A Expired - Fee Related CN102738507B (en) | 2012-07-24 | 2012-07-24 | Full-sealed anti-corrosion integrated welded lithium ion battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102738507B (en) |
| WO (1) | WO2014015451A1 (en) |
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| US10388920B2 (en) * | 2014-08-26 | 2019-08-20 | Cps Technology Holdings Llc | Collar for sealing a battery module |
| CN105261798B (en) * | 2015-11-07 | 2018-05-01 | 合肥国轩高科动力能源有限公司 | A kind of assembling device and assembly method for being suitable for assembling quadrate lithium battery pole group |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102738507A (en) | 2012-10-17 |
| WO2014015451A1 (en) | 2014-01-30 |
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