CN203932204U - A kind of sodium-sulphur battery - Google Patents
A kind of sodium-sulphur battery Download PDFInfo
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- CN203932204U CN203932204U CN201420336853.8U CN201420336853U CN203932204U CN 203932204 U CN203932204 U CN 203932204U CN 201420336853 U CN201420336853 U CN 201420336853U CN 203932204 U CN203932204 U CN 203932204U
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- sodium
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- shell
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- positive pole
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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 utility model discloses a kind of sodium-sulphur battery in chemical energy storage field, comprise the shell being socketed successively from outside to inside, solid electrolyte ceramic pipe, storage sodium pipe, and by the top seal lid of described storage sodium pipe top seal, between described shell and described solid electrolyte ceramic pipe, form cathode chamber, between described storage sodium pipe and described solid electrolyte ceramic pipe, form anode chamber, on the excircle of described shell, be fixed with the current-collecting pole of a vertical direction, on the end face of described current-collecting pole, be fixed with positive pole ear, described positive pole ear is a block electric conductor, its end face is provided with the anodal fixture for self-contained battery connector, between described positive pole ear and the excircle of described shell, leave gap, the resistivity of described positive pole ear and described current-collecting pole is all less than the resistivity of described shell, described top seal hd top face center is provided with boss, and the center of described boss end face is provided with the negative lug that can be socketed for battery connecting piece, and is positioned in described negative lug, for the negative pole fixture of self-contained battery connector.
Description
Technical field
The utility model relates to a kind of sodium-sulphur battery in chemical energy storage field.
Background technology
Existing sodium-sulphur battery housing employing stainless steel or aluminium, aluminum alloy materials.Shell is except the storage place as active material sulphur and sodium polysulfide, the double plus plate current-collecting body of doing.As adopt stainless steel as sodium-sulphur battery housing material, because stainless resistivity is higher, be approximately 30 times of aluminium, during the logical super-high-current of sodium-sulphur battery, the top-down electric current distribution of battery is extremely inhomogeneous, not only causes the internal resistance of cell to increase, and affects the cycle life of battery.
Sodium-sulphur battery negative current collector adopts stainless steel substrates as negative lug, and the area of section of the horizontal cross-section of negative lug is little, and resistance is large, and during battery long-term work, negative lug is easily because of heating fracture.
Utility model content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, a kind of sodium-sulphur battery is provided, it can effectively reduce the contact resistance between sodium-sulphur battery and battery connecting piece, when having large electric current to pass through, its top-down current density is uniformly distributed, thereby effectively reduce its internal resistance, sodium-sulphur battery conveyance capacity is strong, long service life.
A kind of technical scheme that realizes above-mentioned purpose is: a kind of sodium-sulphur battery, comprise the shell being socketed successively from outside to inside, solid electrolyte ceramic pipe, storage sodium pipe, and by the top seal lid of described storage sodium pipe top seal, between described shell and described solid electrolyte ceramic pipe, form cathode chamber, between described storage sodium pipe and described solid electrolyte ceramic pipe, form anode chamber, the end face of described solid electrolyte ceramic pipe is provided with dead ring, described cathode chamber is sealed by the anodal sealing ring between described dead ring and described shell, described anode chamber is sealed by connecting the negative pole sealing ring of described dead ring end face and described top seal lid,
On the excircle of described shell, be fixed with the current-collecting pole of a vertical direction, on the end face of described current-collecting pole, be fixed with positive pole ear, described positive pole ear is a block electric conductor, its end face is provided with the anodal fixture for self-contained battery connector, between described positive pole ear and the excircle of described shell, leave gap, the resistivity of described positive pole ear and described current-collecting pole is all less than the resistivity of described shell;
Described top seal hd top face center is provided with boss, described boss end face Shang center is provided with and can supplies battery connecting piece to be socketed, the negative lug vertical with the end face of described boss, and be positioned in described negative lug, for the negative pole fixture of self-contained battery connector.
Further, described current-collecting pole is to be fixed on the excircle of described shell by spot-welded.
Further, between described current-collecting pole and described shell excircle, the technique of spot-welded is argon arc welding or Laser Welding.
Further, described anodal fixture is by the sunk type internal thread being positioned on described positive pole ear end face, and forms with the bolt that described sunk type internal thread matches.
Further, between described positive pole ear and the end face of described current-collecting pole, by Cold welding, fix.
Further, the bottom surface of described positive pole ear is divided into and is positioned near the solder side of the level of described shell one side with away from described shell one side, acclivitous domatic, the end face of described solder side and described current-collecting pole is fixed by Cold welding, between described domatic and solder side in obtuse angle.
Further, described current-collecting pole is nickel rod or the nickel alloy rod of diameter 1mm.
Further, described negative lug and described boss are one, and described boss is fixed by welding on the end face of described top seal lid.
Further, described negative lug is cylinder, and described negative pole fixture is by the external screw thread that is positioned at described negative lug excircle bottom, and forms with the nut that described external screw thread matches.
Further, described externally threaded diameter is 10mm.
Adopted the technical scheme of a kind of sodium-sulphur battery of the present utility model, on the excircle of shell, be fixed with a current-collecting pole parallel with vertical direction, fixing positive pole ear on the end face of described current-collecting pole, described positive pole ear is a block electric conductor, end face is provided with the anodal fixture for self-contained battery connector, between described positive pole ear and the excircle of described shell, leave gap, the resistivity of described positive pole ear and described current-collecting pole is all less than the resistivity of described shell, top seal hd top face center is provided with boss, described boss end face Shang center is provided with and can supplies battery connecting piece to be socketed, the negative lug vertical with described boss end face, described negative lug is provided with the technical scheme for the sodium-sulphur battery of the negative pole fixture of self-contained battery connector.Its technique effect is: the contact area between the positive pole ear of sodium-sulphur battery and negative lug and battery connecting piece is large, contact resistance is low, when having large electric current to pass through, the top-down current density of sodium-sulphur battery is uniformly distributed, the internal resistance of sodium-sulphur battery is reduced, conveyance capacity strengthens, and extended useful life.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of sodium-sulphur battery of the present utility model.
Fig. 2 is the structural representation of the plus plate current-collecting body of a kind of sodium-sulphur battery of the present utility model.
Embodiment
Refer to Fig. 1 and Fig. 2, inventor people of the present utility model is in order to understand the technical solution of the utility model better, below by embodiment particularly, and is described in detail by reference to the accompanying drawings:
Refer to Fig. 1, sodium-sulphur battery comprise from outside the inwardly shell 1 of socket, solid electrolyte ceramic pipe 4 and storage sodium pipe 5 successively, and anodal sealing ring 13, negative pole sealing ring 14 and be positioned at the dead ring 12 on solid electrolyte ceramic pipe 4 end faces.Wherein, the bottom of shell 1 is provided with sealed bottom lid 11.Between shell 1, solid electrolyte ceramic pipe 4 and sealed bottom lid 11, form cathode chamber a, anodal sealing ring 13 seals cathode chamber a between radially at shell 1 and dead ring 12.Graphite felt (not showing in Fig. 1) is housed in cathode chamber a, the anodal reaction material of sodium-sulphur battery, sulphur or sodium polysulfide are generally filled in the graphite felt between shell 1 and solid electrolyte ceramic pipe 4.Negative pole sealing ring 14 is positioned on the end face of dead ring 12, and storage sodium pipe 5, solid electrolyte ceramic pipe 4, dead ring 12 and negative pole sealing ring 14 surround the anode chamber b of sodium-sulphur battery.In anode chamber b, be full of all the time liquid metal sodium, liquid metal sodium is the cathode reactant of sodium-sulphur battery.Storage sodium pipe 5 storage liquid metal sodiums, and to anode chamber b delivering liquid sodium metal.The top of storage sodium pipe 5 is provided with top seal lid 6, and by the top seal of storage sodium pipe 4, excircle and the negative pole sealing ring 14 of top seal lid 6 are welded and fixed, thereby by the top seal of anode chamber b and storage sodium pipe 5.In anode chamber b, be full of all the time liquid metal sodium, thereby the bottom surface that makes top seal lid 6 contacts with the liquid level of liquid metal sodium in anode chamber b all the time.Above-mentioned is all the conventional design of sodium-sulphur battery.
On sodium-sulphur battery, be generally provided with plus plate current-collecting body and negative current collector.The plus plate current-collecting body of any one sodium-sulphur battery all can pass through battery connecting piece 9, such as wire, connection row etc., connects the negative current collector of adjacent sodium-sulphur battery, thereby several sodium-sulphur batteries are connected to become to sodium-sulphur battery group.
In the utility model, the plus plate current-collecting body of sodium-sulphur battery and negative current collector are improved.
Refer to Fig. 2, in a kind of sodium-sulphur battery of the present utility model, plus plate current-collecting body is except comprising shell 1, also comprising current-collecting pole 2 and positive pole ear 3.Its housing 1 adopts corrosion resistant austenitic stainless steel, to meet the long-term needs that use of sodium-sulphur battery.
Current-collecting pole 2, in the mode of spot-welded, along vertical direction, is fixed on the excircle of shell 1.The welding procedure of spot-welded can adopt the welding procedures such as laser welding, argon arc welding, to guarantee the conductivity between current-collecting pole 2 and shell 1.Meanwhile, the resistivity of current-collecting pole 2 is less than the resistivity of shell 1.Certainly, shell 1 and current-collecting pole 2 also can be fixed by the alternate manner except spot-welded, but precondition is to guarantee the conductivity between shell 1 and current-collecting pole 2.
Positive pole ear 3 is a block electric conductor, is fixed on the end face of current-collecting pole 2.In the present embodiment, between positive pole ear 3 and current-collecting pole 2, passed through Cold welding and fixed.Certainly, positive pole ear 3 also can be fixed by alternate manner with current-collecting pole 2, but precondition is to guarantee the conductivity between positive pole ear 3 and current-collecting pole 2, and the insulating properties between positive pole ear 3 and shell 1, be can not direct conduction between positive pole ear 3 and shell 1, and must realize conduction by current-collecting pole 2.In the present embodiment, positive pole ear 3 with the insulating method between shell 1 is: between positive pole ear 3 and shell 1, be separated, between positive pole ear 3 and the excircle of shell 1, leave gap.Between positive pole ear 3 and current-collecting pole 2, when crossing the fixing object of Cold welding and be just to guarantee that 3 of positive pole ears are fixing with current-collecting pole 2, and between shell 1, produce enough gaps and insulate.
By the fixing current-collecting pole 2 of vertical direction on the excircle at shell 1, fixing positive pole ear 3 on the end face of current-collecting pole 2, and make insulation between positive pole ear 3 and shell 1.Like this, can when passing through sodium-sulphur battery, large electric current all must pass through current-collecting pole 2, rather than the shell 1 of directly flowing through, so in plus plate current-collecting body, what play afflux effect is current-collecting pole 2 rather than shell 1.Therefore large electric current is mainly on current-collecting pole 2.Because the resistivity of current-collecting pole 2 is less than the resistivity of shell 1, the conveyance capacity of sodium-sulphur battery strengthens, and therefore can guarantee that sodium-sulphur battery is inner, and top-down current density is uniformly distributed, and reduces the internal resistance of sodium-sulphur battery, guarantees the cycle life of sodium-sulphur battery.
On the end face of positive pole ear 3, be provided with for battery connecting piece 9 being fixed on to the anodal fixture on positive pole ear 3 end faces.In the present embodiment, anodal fixture is by the sunk type internal thread 31 being positioned on positive pole ear 3 end faces, and forms with the bolt 32 that sunk type internal thread 31 matches.Battery connecting piece 9, by bolt 32 and sunk type internal thread 31, is fixed on the end face of positive pole ear 3, and with the end face of positive pole ear 3, and the excircle of bolt 32 contacts, so that can conduct electricity between positive pole ear 3 and battery connecting piece 9.The preferred diameter 10mm of diameter of sunk type internal thread 31, be less than 10mm, bonding strength between battery connecting piece 9 and positive pole ear 3 is inadequate, battery connecting piece 9 and positive pole ear 3, and the contact area between bolt 32 is little, contact resistance is large, diameter is greater than 10mm, and the bonding strength between battery connecting piece 9 and positive pole ear 3 is excessive, affects monomer sodium-sulphur battery sealing strength, such as the bonding strength between positive pole ear 3 and current-collecting pole 2, and the bonding strength between current-collecting pole 2 and shell.
In the present embodiment, in order to prevent the short circuit of sodium-sulphur battery generation both positive and negative polarity, the end face of positive pole ear 3 is higher than the end face of shell 1.
In the present embodiment, what current-collecting pole 2 adopted is that diameter is nickel rod or the nickel alloy rod of 1mm, adopt the reason of nickel rod or nickel alloy rod to be on the one hand: the resistivity of nickel rod or nickel alloy rod is less than the resistivity of austenitic stainless steel, is convenient to the afflux of current-collecting pole 2.In addition on the one hand, nickel rod or nickel alloy rod shell 1 easy and that austenitic stainless steel is made welds and fixes.Adopt nickel rod or nickel alloy rod that diameter is 1mm, reason is: nickel rod or nickel alloy rod diameter are too small, will cause the rising of sodium-sulphur battery internal resistance, and nickel rod or nickel alloy rod diameter are excessive, cause manufacturing cost to rise and waste.Certainly, the cross sectional shape of nickel rod or nickel alloy rod can be also other shapes, such as rectangle etc.
In the present embodiment, between current-collecting pole 2 and the excircle of shell 1, the spacing between the pad of any two adjacent spot-welded is 10mm.The object of design is like this: the spacing between the pad of any two adjacent spot-welded is excessive, and the bonding strength between current-collecting pole 2 and shell 1 is inadequate, and current-collecting pole 2 is easily separated with positive pole ear 3; Otherwise heat-affected zone increases in the time of may causing welding.
Positive pole ear 3 adopts aluminum alloy material, especially can select hardness high, resistant to elevated temperatures albronze, select the object of albronze to be: albronze intensity is high, can prevent that positive pole ear 3 from use rupturing, simultaneously, the good conductivity of albronze, can guarantee the overcurrent of large electric current, thereby guarantee that sodium-sulphur battery is inner, top-down current density is uniformly distributed.
Meanwhile, the bottom surface of positive pole ear 3 is divided into and is positioned near the solder side 33 of the level of shell 1 one sides and acclivitous domatic 34 away from shell 1 one sides, and solder side 33 carries out Cold welding for the end face with current-collecting pole 2, domatic 34 and solder side 33 between in obtuse angle.The object of design is like this: guarantee that after the bottom surface of positive pole ear 3 and the welding of the end face of current-collecting pole 2, it is stable that center of gravity keeps, thereby prevent that positive pole ear 3 from coming off from the end face of current-collecting pole 2.
Negative current collector, except for by the top seal lid 6 of the anode chamber b of sodium-sulphur battery and 5 sealings of storage sodium pipe, also comprises boss 7 and negative lug 8, and is positioned in negative lug 8, for by the fixing negative pole fixture of battery connecting piece 9.Wherein boss 7 is positioned at the center that top seal covers 6 end faces, and negative lug 8 is positioned at the center of boss 7 end faces, and vertical with the end face of boss 7.The effect of boss 7 is: sodium-sulphur battery prevents the short circuit of single sodium-sulphur battery generation both positive and negative polarity after being connected to become sodium-sulphur battery group by battery connecting piece 9.In the present embodiment, the height of boss 7 is 3～7mm, if the height of boss 7 is greater than 7mm, the internal resistance increase of sodium-sulphur battery and the rising of cost will be caused, highly be less than 3mm, after sodium-sulphur battery is connected to become sodium-sulphur battery group by battery connecting piece, prevent that the effect of the short circuit of single sodium-sulphur battery generation both positive and negative polarity from will give a discount.The end face of boss 7 and the end face of positive pole ear 3 are contour simultaneously.
In the present embodiment, negative lug 8 is one with boss 7, and boss 7 is fixed by welding on the end face of top seal lid 6, to guarantee the conductivity of negative current collector.Welding for the ease of boss 7 with top seal lid 6, negative lug 8, boss 7 are all made by stainless steel with top seal lid 6.
In the present embodiment, negative lug 8 be shaped as cylinder, to facilitate the socket of battery connecting piece 9, making to form circumference between battery connecting piece 9 and negative lug 8 contacts, to increase the contact area between negative lug 8 and battery connecting piece 9, to reduce the contact resistance between negative lug 8 and battery connecting piece 9.At the bottom of the shape of negative lug 8 is designed to cylindrical another one order, be: than available technology adopting on the end face of top seal lid 6 soldering stainless steel sheet as negative lug 8, the area of section of negative lug 8 increases, the resistance of negative lug 8 reduces, the conveyance capacity of negative current collector strengthens, during sodium-sulphur battery long-term work, negative lug 8 can not rupture because of heating yet.
Because negative lug 8 designs become cylinder, being used for can be by the external screw thread 81 that is positioned at negative lug 8 bottoms by the fixing negative pole fixture of battery connecting piece 9, and form with the nut 82 that external screw thread 81 matches, by coordinating of external screw thread 81 and nut 82, battery connecting piece 9 is fixed on the end face of boss 7.Socket due to battery connecting piece 9, when forming circumference between negative lug 8 and contact, the end face of battery connecting piece 9 contacts with the bottom surface formation face of nut 82, the bottom surface of battery connecting piece 9 contacts with the end face formation face of boss 7, therefore the contact area between negative current collector and battery connecting piece 9 increases, reduce the contact resistance between negative current collector and battery connecting piece 9, increased the conveyance capacity of sodium-sulphur battery.
In the present embodiment, the preferred diameter 10mm of the diameter of external screw thread 81, the diameter of external screw thread 81 is less than 10mm, and the bonding strength between battery connecting piece 9 and negative lug 8 is inadequate, and contact area is little, and contact resistance is large.The diameter of external screw thread 81 is greater than 10mm, and the bonding strength between battery connecting piece 9 and negative lug 8 is excessive, affects cell sealing strength, especially the bonding strength between top seal lid 6 and negative pole sealing ring 14.
Certainly negative lug 8 can be also that horizontal cross-section is the column of other shape, such as prism, Elliptic Cylinder etc., also can play the contact area increasing between negative lug 8 and battery connecting piece 9, to reduce the contact resistance between negative lug 8 and battery connecting piece 9, increase the area of section of the horizontal cross-section of negative lug 8, reduce the resistance of negative lug 8, the conveyance capacity that strengthens negative current collector, prevents the technique effect that negative lug 8 ruptures because of heating.
Those of ordinary skill in the art will be appreciated that, above embodiment is only for the utility model is described, and be not used as restriction of the present utility model, as long as within the scope of connotation of the present utility model, to the variation of the above embodiment, modification, all will drop within the scope of claims of the present utility model.
Claims (10)
1. a sodium-sulphur battery, comprise the shell being socketed successively from outside to inside, solid electrolyte ceramic pipe, storage sodium pipe, and by the top seal lid of described storage sodium pipe top seal, between described shell and described solid electrolyte ceramic pipe, form cathode chamber, between described storage sodium pipe and described solid electrolyte ceramic pipe, form anode chamber, the end face of described solid electrolyte ceramic pipe is provided with dead ring, described cathode chamber is sealed by the anodal sealing ring between described dead ring and described shell, described anode chamber is sealed by connecting the negative pole sealing ring of described dead ring end face and described top seal lid, it is characterized in that:
On the excircle of described shell, be fixed with the current-collecting pole of a vertical direction, on the end face of described current-collecting pole, be fixed with positive pole ear, described positive pole ear is a block electric conductor, its end face is provided with the anodal fixture for self-contained battery connector, between described positive pole ear and the excircle of described shell, leave gap, the resistivity of described positive pole ear and described current-collecting pole is all less than the resistivity of described shell;
Described top seal hd top face center is provided with boss, described boss end face Shang center is provided with and can supplies battery connecting piece to be socketed, the negative lug vertical with the end face of described boss, and be positioned in described negative lug, for the negative pole fixture of self-contained battery connector.
2. a kind of sodium-sulphur battery according to claim 1, is characterized in that: described current-collecting pole is to be fixed on the excircle of described shell by spot-welded.
3. a kind of sodium-sulphur battery according to claim 2, is characterized in that: between described current-collecting pole and described shell excircle, the technique of spot-welded is argon arc welding or Laser Welding.
4. a kind of sodium-sulphur battery according to claim 1, is characterized in that: described anodal fixture is by the sunk type internal thread being positioned on described positive pole ear end face, and forms with the bolt that described sunk type internal thread matches.
5. a kind of sodium-sulphur battery according to claim 1, is characterized in that: between described positive pole ear and the end face of described current-collecting pole, by Cold welding, fix.
6. a kind of sodium-sulphur battery according to claim 1, it is characterized in that: the bottom surface of described positive pole ear is divided into and is positioned near the solder side of the level of described shell one side with away from described shell one side, acclivitous domatic, the end face of described solder side and described current-collecting pole is fixed by Cold welding, between described domatic and solder side in obtuse angle.
7. a kind of sodium-sulphur battery according to claim 1, is characterized in that: described current-collecting pole is nickel rod or the nickel alloy rod of diameter 1mm.
8. a kind of sodium-sulphur battery according to claim 1, is characterized in that: described negative lug and described boss are one, and described boss is fixed by welding on the end face of described top seal lid.
9. a kind of sodium-sulphur battery according to claim 1, is characterized in that: described negative lug is cylinder, and described negative pole fixture is by the external screw thread that is positioned at described negative lug excircle bottom, and forms with the nut that described external screw thread matches.
10. a kind of sodium-sulphur battery according to claim 9, is characterized in that: described externally threaded diameter is 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420336853.8U CN203932204U (en) | 2014-06-23 | 2014-06-23 | A kind of sodium-sulphur battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420336853.8U CN203932204U (en) | 2014-06-23 | 2014-06-23 | A kind of sodium-sulphur battery |
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| Publication Number | Publication Date |
|---|---|
| CN203932204U true CN203932204U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420336853.8U Withdrawn - After Issue CN203932204U (en) | 2014-06-23 | 2014-06-23 | A kind of sodium-sulphur battery |
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| CN (1) | CN203932204U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051798A (en) * | 2014-06-23 | 2014-09-17 | 上海电气钠硫储能技术有限公司 | Sodium-sulphur battery |
| CN106099214A (en) * | 2016-08-17 | 2016-11-09 | 上海电气钠硫储能技术有限公司 | A kind of positive electrode of sodium-sulfur cell container and sodium-sulphur battery |
-
2014
- 2014-06-23 CN CN201420336853.8U patent/CN203932204U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104051798A (en) * | 2014-06-23 | 2014-09-17 | 上海电气钠硫储能技术有限公司 | Sodium-sulphur battery |
| CN106099214A (en) * | 2016-08-17 | 2016-11-09 | 上海电气钠硫储能技术有限公司 | A kind of positive electrode of sodium-sulfur cell container and sodium-sulphur battery |
| CN106099214B (en) * | 2016-08-17 | 2018-11-13 | 上海电气钠硫储能技术有限公司 | A kind of positive electrode of sodium-sulfur cell container and sodium-sulphur battery |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141105 Effective date of abandoning: 20160323 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |