CN1234617A - High-temp. sealing material and sealing technology for soild oxide fuel cells - Google Patents
High-temp. sealing material and sealing technology for soild oxide fuel cells Download PDFInfo
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- CN1234617A CN1234617A CN 99104482 CN99104482A CN1234617A CN 1234617 A CN1234617 A CN 1234617A CN 99104482 CN99104482 CN 99104482 CN 99104482 A CN99104482 A CN 99104482A CN 1234617 A CN1234617 A CN 1234617A
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C8/00—Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
- C03C8/24—Fusion seal compositions being frit compositions having non-frit additions, i.e. for use as seals between dissimilar materials, e.g. glass and metal; Glass solders
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Abstract
The present invention relates to a high-temp. sealing material for solid oxide fuel cell and its sealing technology. It is characterized by that it uses Al2O3, SiO2 and CaO, etc as raw material, adopts the processes of mixing, ball-grinding and prefiring, etc. to obtain the internal sealing ceramic powder and external sealing vitreous material; then uses adhesive and adjuvant, etc., and firstly uses internal sealing material between cell elements, then applies the external sealing material on the external surface of the sealing zone, finally, it makes high-temp. treatment according to the program. By possessing low chemical activity and porous structure of internal sealing material and densification and imibibition of external sealing material said invented product has good air tightness, thermal matching property and high cost performace to raise the cell performance and its service life.
Description
The invention belongs to a kind of fluid sealant of Solid Oxide Fuel Cell, and use this fluid sealant to carry out the method for sealing-in.
Solid Oxide Fuel Cell (being called for short SOFC) working temperature is at 800～1000 ℃, and two kinds of working gass (reproducibility fuel gas and oxidizing gas) pass through the electrochemical reaction of dielectric substrate directly oxidized, and the chemical energy that is discharged is converted into electric energy.If there is leakage the element of SOFC or interelement junction, make two kinds of gases take place to connect and mix, then fuel cell can't be worked, even blast.Preventing gas leakage, require cell device (as electrolyte, earthenware) itself enough fine and close on the one hand, then is to keep good air-tightness in the coupling part of different elements and different materials on the other hand.Sealing Technology is vital to the particularly flat SOFC of SOFC.Seal, sealing materials of the present invention designs for different elements, different materials sealing-in densification.
The prior art close with the present invention is to be published in " Electrochemical Pro-ceedings ", and Volume 97-18, the exercise question of P652 are " CaO-Al
2O
3-SiO
2Be glass to ceramic seal glue " (GLASS-CERAMIC SEALANTS CaO-Al
2O
3-SiO
2) article.The main component that prior art has been introduced glass to ceramic seal glue comprises CaO, Al
2O
3And SiO
2, introduced the preparation and the gas-tight test of sealing glue.Preparation process is roughly raw materials of Ca CO
3, Al
2O
3, quartz sand etc. presses special ratios and mixes, fusion is 2 hours under 1600 ℃ of temperature, quenches on mould, grinds to form fine powder at last.Sealing technology roughly process is, the fine-powdered fluid sealant is pressed into sheet, places sealing-in place, is heated to 800～1000 ℃, and fluid sealant is softened, and will added the purpose that certain pressure reaches sealing by sealing-in element place.The fluid sealant of prior art and sealing-in test are carried out at SOFC.
The fluid sealant of prior art does not provide component and ratio more specifically.On performance, have good, anti-oxidant Well-recovered, the good stability of air-tightness, be easy to and advantages such as ceramic material combination of elements.But this fluid sealant is relatively poor with electrolytical hot property coupling, is difficult to the cell device of simultaneous adaptation electrolyte and two different materials of pottery, can cause component wear in heating and cooling process.This fluid sealant is because fusing point is lower, and the component complexity to high intermediate temperature sealing process of SOFC and long-time the use time, may react with the function element of battery key, influences battery life.This fluid sealant can cause its spread to make it to destroy on the cell device surface owing to the flowability that has to a certain degree when sealing temperature is high slightly.
The present invention is for overcoming the deficiencies in the prior art, and design different material composition is prepared two kinds of different encapsulants, adopts the binary sealing technology, make the sealing-in between the cell device of different materials, air-tightness is good, and hot matching performance is good, chemical stability is good, ratio of performance to price height; Thereby do not damage cell device, reach the purpose of extending battery life.
Solid Oxide Fuel Cell high temperature seal, sealing materials of the present invention belongs to CaO-Al
2O
3-SiO
2Series promptly contains CaO, Al in the component
2O
3And SiO
2Since the ingredient difference, sealing-in ceramic powder and two kinds of seal, sealing materials of outer sealing-in vitreous material in being divided into.The component of interior sealing-in ceramic powder comprises Al
2O
3, ZrO
2, SiO
2, Y
2O
3, Cr
2O
3And CaO, wherein Al
2O
3Account for 77～83% of total component by mass ratio; The fluid sealant of outer sealing-in vitreous material and prior art is close.
The contained component of interior sealing-in ceramic powder is roughly Al by mass ratio
2O
3/ ZrO
2/ Y
2O
3/ SiO
2/ Cr
2O
3/ CaO=(5～6)/1/ (0.1～0.2)/(0.1～0.15)/(0.02～0.03)/(0.01～0.03); Outer sealing-in vitreous material each component is SiO by mass ratio
2/ Al
2O
3/ ZrO
2/ CaO/Bi
2O
3/ NaHCO
3/ Fe
2O
3=(5.5～9)/(2.2～2.8)/1/ (0.4～0.8)/(0.4～0.8)/(0.2～0.4)/(0.2～0.4).
The preparation method of two kinds of seal, sealing materials of the present invention comprises the process of batching, ball milling, pre-burning, powder process, and is close with prior art in batching and pulverizing process, but still has any different.Said batching is in component and ratio raw material to be mixed; Said ball milling is to be auxiliary agent with mixed material with ethanol, and mixed grinding is 4～8 hours in ball mill; Said pre-burning is with the pre-burning 4～10 hours under 1000～1500 ℃ of temperature of the batch mixing behind the ball milling; Said powder process is that the batch mixing quenching of pre-burning is taken out, and grinds again and sieves.
Internal sealing-in ceramic powder and outer sealing-in vitreous material, its preparation process is also different.Such as on the material composition, on calcined temperature and time, all have on the granularity of powder process different.The raw material of interior sealing-in ceramic powder should be with Al
2O
3Be main, by aforesaid component and mass ratio batch mixing, pre-burning is 8～10 hours under 1300～1550 ℃ of conditions, 140 mesh sieves of pulverizing.Outer sealing-in vitreous material is then with SiO
2Be main, by aforesaid component and mass ratio batch mixing, pre-burning is 4～7 hours under 1000～1200 ℃ of conditions, 200 mesh sieves of pulverizing.
Two kinds of seal, sealing materials are made behind the powder standby, also concoct use with bonding agent, solvent when concrete sealing-in.Because the material composition and the mass ratio difference of two kinds of seal, sealing materials, preparation condition difference, thereby be two kinds of materials that character is totally different, i.e. fusible glass state material under the low activity ceramic material of porous and the fine and close high temperature.
The basic ideas of SOFC high temperature sealing technology of the present invention are the binary method for sealing.Promptly being used in combination with two steps of two kinds of seal, sealing materials carried out sealing-in.Concrete sealing technology comprises material preparation (condiment), cleans the sealing-in district.Processes such as sealing-in (sealing-in and two steps of outer sealing-in in comprising), high-temperature process.
It is that interior sealing-in ceramic powder, bonding agent, solvent are ground to form pasty state that material is prepared, and makes interior seal, sealing materials; Outer sealing-in vitreous material, bonding agent, solvent are ground to form slurry, make outer sealing-in material.
Cleaning the sealing-in district is that fuel cell is treated sealing-in district NaOH and HNO
3Aqueous solution alternate repetition soaking and washing respectively, clean oven dry with distilled water again.
Sealing-in is the way that adopts interior seal, sealing materials and twice sealing-in of outer sealing-in material.Interior sealing-in is to coat interior seal, sealing materials on a sealing-in element, is coated with one deck bonding agent again, on the seal, sealing materials, at room temperature leaves standstill more than 1 hour in before the bonding agent drying another sealing-in element being pressed in; Outer sealing-in is a sealing-in material outside the outer surface in sealing-in district applies repeatedly, and seal, sealing materials and sealing-in seam crossing in covering fully dry in the shade.
Carry out high-temperature process at last, the fuel cell after outer sealing-in material is dried in the shade is placed in the high temperature furnace and heats up, and insulation is 1.5～2.5 hours during to 780～820 ℃, is warming up to 1000～1100 ℃ of insulations 20-50 minute again, at last cooling.
During aforesaid material was prepared, bonding agent was selected the organic adhesive that substantially fuel cell component is not had influence for use, mixed with ethanolic solution as the ethyl acetate saturated solution that adopts epoxy resin, added ethylenediamine again and made curing agent.Intensification in high-temperature process and cooling are to carry out with 1～60 ℃ of/minute clock rate soon after room temperature to 780 ℃ process is slow earlier; Being warming up to 1000～1100 ℃ of processes in insulation after 2 hours carries out with 8～12 ℃ of/minute clock rate; When cooling, reduce to 200 ℃ with-5～-1 ℃ of/minute clock rate first quick and back slow, naturally cool to room temperature again.
The preparation of sealing-in ceramic powder and outer sealing-in vitreous material in the embodiment 1.
Get Al
2O
380 grams, ZrO
215 grams, SiO
22.5 gram, Y
2O
32 grams, Cr
2O
30.2 gram, the CaO0.3 gram evenly mixes with the ethanol of 150ml95%, puts into the 250ml agate jar, mixes with planetary ball mill and grinds 6 hours.Be placed on pre-burning in electric furnace in the corundum after the taking-up, pre-burning is 10 hours under 1450 ℃ of conditions.Annealing is pulverized after taking out again, crosses 140 mesh sieves, makes sealing-in ceramic powder in about 70 grams.Get SiO
212 grams, Al
2O
34 grams, ZrO
22 grams, CaO1 gram, Bi
2O
31 gram, NaHCO
30.6 gram, Fe
2O
30.4 gram, evenly be blended in the agate jar of 250ml with 30ml 95% ethanol, ground 6 hours with planetary ball mill is mixed, taking-up is placed on pre-burning in the porcelain crucible, pre-burning is 5 hours under 1100 ℃ of conditions, again ground 2 hours with agate jar after quenching is taken out, cross 200 mesh sieves, make the outer sealing-in vitreous material of about 20 grams.Embodiment 2, the preparation of bonding agent.
The ethyl acetate saturated solution of epoxy resin mixes by 1: 3 volume ratio with 95% ethanolic solution, and the curing agent ethylenediamine makes high temperature adhesive.Embodiment 3, and material is prepared.
Use the interior sealing-in ceramic powder of embodiment 1 preparation and the bonding agent of embodiment 2 preparations to mix in 2: 1 by volume, add proper amount of solvent ethanol, quantity of solvent can be 1/6～1/2 of interior sealing-in ceramic powder, hand lapping is 15 minutes in agate mortar, it is mixed be the pasty state of stablizing thickness, slowly be advisable to flow downward after coating on the vertical substrate, its viscosity is adjusted by quantity of solvent.The interior seal, sealing materials that makes is deposited in the bigger environment of humidity with container.
Use the outer sealing-in vitreous material of embodiment 1 preparation and the bonding agent of embodiment 2 preparations to mix in 2: 3 by volume, adds 2 parts solvent, ground 10 minutes, make it to become uniform grey slurry, phenomenon is separated out in the nothing reunion, and it is well-balanced to be coated on the ceramic wafer colourity.Embodiment 4, sealing-in.
Install the sealing-in element on the special anchor clamps of making, treating to be coated with interior seal, sealing materials in the sealing-in district of sealing-in element equably then, the about 2～5mm of thickness suitably repairs with blade after finishing.The sealing-in one side treated at the sealing-in cell device is coated the skim high temperature adhesive again, and on the seal, sealing materials, whole closure at room temperature left standstill 1 hour in before it is dry another element being pressed in gently.
Treat by two elements of sealing-in bonding after, dip in outer sealing-in material with hairbrush, outer surface applies repeatedly in the sealing-in district, seal, sealing materials and sealing-in seam region in covering fully make contact interface keep soaking into, and dry in the shade.Embodiment 5, high-temperature process.
The fuel cell that sealing-in is dried in the shade is placed in the high-temperature electric resistance furnace, by following temperature programming, insulation, intensification again, insulation again, cooling at last.
(as following table)
Embodiment 6, the prescription of outer sealing-in material.
| Temperature range (℃) | Heating rate (℃/min) | Temperature retention time (min) |
| ????20～150 | ????1～3 | ????D?D |
| ????150～450 | ????2～4 | ????D?D |
| ????450～800 | ????4～6 | ????D?D |
| ????800 | ????D??D | ????80～180 |
| ????800～1050 | ????8～12 | ????D?D |
| ????1050 | ????D??D | ????20～50 |
| ????1050～800 | ????-5～-3 | ????D?D |
| ????800～200 | ????-4～-1 | ????D?D |
| ????200～20 | With the stove natural cooling | ????D?D |
On the prescription basis of the outer sealing-in material in embodiment 1, add the Li of 0.1～0.2 gram
2O.Like this, the material coefficient of thermal expansion performance is made moderate progress.Embodiment 7, sealing-in fuel cell experimental result (1), adopt the described sealing technology of this patent, with above-mentioned seal, sealing materials and method sealing-in (Φ 13 * 1mm) yttria-stabilized zirconias (YSZ) are electrolyte, and Ni-YSZ is an anode, La with the disk shape
0.7Sr
0.3MnO
3Being the monocell of negative electrode, is that fuel gas, air are that oxic gas is tested with hydrogen, and result of the test shows that the battery open circuit voltage during 900 ℃ of work reaches 1.5V, and output power density reaches 80mW/cm
2, battery was 700-900 ℃ of work 10 hours, and obvious decline does not take place in output voltage, illustrates that gas leakage does not take place battery all the time, and sealing-in is respond well.
(2), adopt the described sealing technology of this patent, with above-mentioned seal, sealing materials and method sealing-in YSZ short tube (the about 12mm of external diameter, thick about 1mm, the long 10mm) electrolyte for preparing of slip casting method, Ni-YSZ is an anode, La
0.7Sr
0.3MnO
3Being the monocell of negative electrode, is that fuel gas, air are that oxic gas is tested with hydrogen, and result of the test shows that the battery open circuit voltage during 900 ℃ of work reaches 1.14V, and output power density reaches 50mW/cm
2, battery was 700～900 ℃ of work 20 hours, and output voltage does not take place obviously to descend yet, and illustrates that gas leakage does not take place battery all the time, and sealing-in is respond well.
High temperature seal, sealing materials of the present invention and sealing technology have following effect.
Because interior seal, sealing materials has used the ceramic powder of low chemically active larger particles, add a small amount of high temperature adhesive, own stable chemical nature not only, namely not with cell device generation adverse effect, and can under the sealing-in condition, obtain the porous effect, have good contacting with cell device and outer sealing-in material. Therefore, can avoid outer sealing-in material (glass state material) directly to contact with the large tracts of land of cell device, the reaction that occurs with cell device (particularly electrolyte) that has solved prior art, battery performance can not reduce because of the diffusion of outer sealing-in material. Simultaneously, the interior seal, sealing materials of porous can also play the cushioning effect of thermal deformation as transition zone, reduces thermal stress, effectively reduces the danger that the hot property mismatch is brought. In addition, treat the cell device of sealing-in if any rough and uneven in surface part, interior seal, sealing materials can play to fill and remedy effect, reduces battery because the Leakage Gas that this defective causes.
Since outer sealing-in materials'use fusible vitreous material under certain high temperature, by the softening melting under the sealing-in condition, cover sealing-in district outer surface, obtain the excellent effect of air seal. Outer sealing-in material is not only fine and close, and infiltrates mutually with the material of cell device, thereby does not separate during with Reusability after cooling.
The binary method for sealing, use the different performance of different materials, maximize favourable factors and minimize unfavourable ones, excellent sealing, heat coupling, high temperature resistant, stable chemical performance texts have not only been produced, sealing-in operation does not resemble prior art and like that needs the use of seal, sealing materials plus-pressure is added that the binary sealing-in reduces material performance requirement that the two can simplify the operation, reduce cost, thereby the present invention has the higher ratio of performance to price.
Claims (7)
1, a kind of high temperature seal, sealing materials of Solid Oxide Fuel Cell contains CaO, Al in the component
2O
3, SiO
2, it is characterized in that sealing-in ceramic powder and outer sealing-in vitreous material in being divided into; The component of interior sealing-in ceramic powder also contains ZrO
2, Y
2O
3And Cr
2O
3, Al wherein
2O
3Account for 77%～83% of total component by mass ratio; The component of outer sealing-in vitreous material also contains ZrO
2, Bi
2O
3, NaHCO
3, Fe
2O
3, SiO wherein
2Account for 47～67% of total component by mass ratio.
2, according to the high temperature seal, sealing materials of the described Solid Oxide Fuel Cell of claim 1, sealing-in ceramic powder each component is Al by mass ratio in it is characterized in that
2O
3/ ZrO
2/ Y
2O
3/ SiO
2/ Cr
2O
3/ CaO=(5～6)/1/ (0.1～0.2)/(0.1～0.15)/(0.02～0.03)/(0.01～0.03); Outer sealing-in vitreous material each component is SiO by mass ratio
2/ Al
2O
3/ ZrO
2/ CaO/Bi
2O
3/ NaHCO
3/ Fe
2O
3=(5.5～9)/(2.2～2.8)/1/ (0.4～0.8)/(0.4～0.8)/(0.2～0.4)/(0.2～0.4).
3, a kind of method for preparing the high temperature seal, sealing materials of claim 1 Solid Oxide Fuel Cell comprises the process of batching, ball milling, pre-burning, powder process in turn, and said batching is in component and ratio raw material to be mixed; Said powder process is quench to take out after the pre-burning, grinds again and sieves, and it is characterized in that, said ball milling is to be auxiliary agent with mixed material with ethanol, and mixed grinding is 4～8 hours in ball mill; Said pre-burning is pre-burning 4～10 hours under 1000～1500 ℃ of temperature.
4,, it is characterized in that by the component of interior sealing-in ceramic powder and quality than batch mixing, pre-burning is 8～10 hours under 1300～1550 ℃ of conditions, 140 mesh sieves of pulverizing after the quenching according to the preparation method of the described seal, sealing materials of claim 3.
5,, it is characterized in that by the component of outer sealing-in vitreous material and quality than batch mixing, pre-burning is 4～7 hours under 1000～1200 ℃ of conditions, 200 mesh sieves of pulverizing after the quenching by the preparation method of the described seal, sealing materials of claim 3.
6, a kind of sealing technology that uses the Solid Oxide Fuel Cell of claim 1 high temperature seal, sealing materials, comprise material preparation, clean the process of sealing-in district, sealing-in, high-temperature process, it is characterized in that,
(1), to prepare be that interior sealing-in ceramic powder, bonding agent, solvent are ground to form pasty state to material, makes interior seal, sealing materials; Outer sealing-in vitreous material, bonding agent, solvent are ground to form slurry, make outer sealing-in material;
(2), said cleaning sealing-in district, be that fuel cell is treated that the sealing-in district is with NaOH and HNO
3Aqueous solution alternate repetition soaking and washing respectively, clean oven dry with distilled water again;
(3), said sealing-in adopt in the method for seal, sealing materials and twice sealing-in of outer sealing-in material,
-interior sealing-in is coated with interior seal, sealing materials on a sealing-in element, be coated with the last layer bonding agent again, on the seal, sealing materials, at room temperature leaves standstill more than 1 hour in before the bonding agent drying another sealing-in element being pressed in;
-outer sealing-in, sealing-in material outside the outer surface in sealing-in district applies repeatedly, seal, sealing materials and sealing-in seam crossing in covering fully dry in the shade;
(4), said high-temperature process, be that fuel cell after outer sealing-in material is dried in the shade is placed in the high temperature furnace and heats up, to 780～820 ℃ of insulations 1.5～2.5 hours, be warming up to 1000～1100 ℃ of insulations 20～50 minutes again, at last cooling.
7,, it is characterized in that said bonding agent adopts the ethyl acetate saturated solution of epoxy resin to mix with ethanolic solution, adds ethylenediamine again and makes curing agent according to the sealing technology of the described Solid Oxide Fuel Cell of claim 6; In high-temperature process, heat up and cooling, to 780-820 ℃ of process, carry out with 1～6 ℃ of/minute clock rate soon after elder generation is slow in room temperature; Be warming up to 1000～1100 ℃ of processes in insulation after 2 hours and carry out, when cooling, reduce to 200 ℃ with-5～-1 ℃ of/minute clock rate first quick and back slow, naturally cool to room temperature again with 8～12 ℃ of/minute clock rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99104482 CN1095598C (en) | 1999-04-23 | 1999-04-23 | High-temp. sealing material and sealing technology for soild oxide fuel cells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99104482 CN1095598C (en) | 1999-04-23 | 1999-04-23 | High-temp. sealing material and sealing technology for soild oxide fuel cells |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1234617A true CN1234617A (en) | 1999-11-10 |
| CN1095598C CN1095598C (en) | 2002-12-04 |
Family
ID=5271696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99104482 Expired - Fee Related CN1095598C (en) | 1999-04-23 | 1999-04-23 | High-temp. sealing material and sealing technology for soild oxide fuel cells |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1095598C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148322B (en) * | 2007-06-29 | 2011-05-11 | 清华大学 | Microcrystal glass sealing material used for solid oxide fuel battery and sealing method thereof |
| CN1884423B (en) * | 2006-05-19 | 2012-03-21 | 中国矿业大学(北京) | Complex phase seal material for solid oxide fuel cell and its preparation method |
| CN103030278A (en) * | 2013-01-08 | 2013-04-10 | 福州大学 | Glass sealing material, as well as preparation and using methods thereof |
| CN101443947B (en) * | 2006-04-05 | 2014-09-17 | 圣戈本陶瓷及塑料股份有限公司 | SOFC stack having a high temperature bonded ceramic interconnect and method for making same |
| CN104604005B (en) * | 2012-08-31 | 2017-03-01 | 日本特殊陶业株式会社 | Cell of fuel cell with dividing plate and its manufacture method and fuel cell pack |
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| CN100438183C (en) * | 2003-09-03 | 2008-11-26 | 中国科学院上海硅酸盐研究所 | Medium and high temperature sealing method of plate type solid oxide fuel battery and its sealing material |
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1999
- 1999-04-23 CN CN 99104482 patent/CN1095598C/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101443947B (en) * | 2006-04-05 | 2014-09-17 | 圣戈本陶瓷及塑料股份有限公司 | SOFC stack having a high temperature bonded ceramic interconnect and method for making same |
| CN1884423B (en) * | 2006-05-19 | 2012-03-21 | 中国矿业大学(北京) | Complex phase seal material for solid oxide fuel cell and its preparation method |
| CN101148322B (en) * | 2007-06-29 | 2011-05-11 | 清华大学 | Microcrystal glass sealing material used for solid oxide fuel battery and sealing method thereof |
| CN104604005B (en) * | 2012-08-31 | 2017-03-01 | 日本特殊陶业株式会社 | Cell of fuel cell with dividing plate and its manufacture method and fuel cell pack |
| CN103030278A (en) * | 2013-01-08 | 2013-04-10 | 福州大学 | Glass sealing material, as well as preparation and using methods thereof |
| CN103030278B (en) * | 2013-01-08 | 2014-12-03 | 福州大学 | Glass sealing material, as well as preparation and using methods thereof |
| CN114079061A (en) * | 2020-08-20 | 2022-02-22 | 国家能源投资集团有限责任公司 | Sealing structure for battery and battery |
| CN114079061B (en) * | 2020-08-20 | 2023-04-25 | 国家能源投资集团有限责任公司 | Sealing structure for battery and battery |
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| Publication number | Publication date |
|---|---|
| CN1095598C (en) | 2002-12-04 |
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