CN203690421U - Cylindrical sealing die of lithium cell - Google Patents
Cylindrical sealing die of lithium cell Download PDFInfo
- Publication number
- CN203690421U CN203690421U CN201320763777.4U CN201320763777U CN203690421U CN 203690421 U CN203690421 U CN 203690421U CN 201320763777 U CN201320763777 U CN 201320763777U CN 203690421 U CN203690421 U CN 203690421U
- Authority
- CN
- China
- Prior art keywords
- inner core
- die
- lithium battery
- location hole
- cylinder type
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 42
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 32
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 36
- 238000005096 rolling process Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 abstract description 6
- 229910000831 Steel Inorganic materials 0.000 abstract 7
- 239000010959 steel Substances 0.000 abstract 7
- 238000004880 explosion Methods 0.000 abstract 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 6
- 229910001416 lithium ion Inorganic materials 0.000 description 6
- 238000003490 calendering Methods 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 230000004308 accommodation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910000733 Li alloy Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000001989 lithium alloy Substances 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model discloses a cylindrical sealing die of a lithium cell. The cylindrical sealing die comprises a clamping die used for fixing a steel shell and a concave die used for rolling the head of the steel shell, wherein the concave die comprises an inner core, a buffer protective sleeve and a connecting sleeve which are coaxially sleeved in sequence from inside to outside; the buffer protective sleeve is respectively matched with the inner core and the connecting sleeve in a sliding manner and comprises an elastic washer and a protective sleeve which are in axial distribution along the inner core; the inner wall of the protective sleeve and the bottom surface of the inner core define a die cavity containing the head of the steel shell; the bottom surface of the inner core is an arc-shaped surface. According to the utility model, the inner core, the protective sleeve and the clamping sleeve are used for fixing the head of the steel shell in the die cavity, the pressurized and deformed elastic washer is used so that the head of the steel shell is rolled and deformed to complete sealing by virtue of the pressure from the inner core; in the sealing process, the head of the steel shell is cut off after being subjected to fixing and deforming due to pressure in the die cavity; when being pressurized, the head of the steel shell is already enclosed and fixed by the protective sleeve, so that the enlargement of an outer diameter, port explosion and wrinkling are avoided.
Description
Technical field
The utility model belongs to technical field of lithium batteries, is specifically related to a kind of cylinder type lithium battery sealing die.
Background technology
Lithium battery refers in electrochemical system and contains the lithium battery of (comprising lithium metal, lithium alloy and lithium ion, lighium polymer), and lithium battery is broadly divided into lithium metal battery box lithium ion battery two classes.Wherein, lithium metal battery is that a class is negative material, the battery that uses non-aqueous electrolytic solution by lithium metal or lithium alloy, normally cannot charge.And lithium ion battery is to be generally that positive electrode, graphite are negative material, the battery that uses nonaqueous electrolyte by lithium alloy metal oxide, the not lithium of containing metal state of lithium ion battery, and can charge.
Owing to not containing any precious metal in lithium ion battery, not only raw material are all very cheap, and it is high to have voltage, discharge and recharge the life-span long, the plurality of advantages such as the little and self-discharge rate of environmental pollution is low, have been widely used in each electronic product as a kind of clean energy resource, as smart mobile phone, notebook computer, digital camera and portable small-sized electrical equipment etc.
From the contour structures of battery, common lithium ion battery has cylinder type lithium battery, quadrate lithium battery and button lithium battery.Traditional cylinder type lithium battery generally comprises battery core, the block that holds the box hat of described battery core and match with described box hat, the two ends of described battery core are respectively equipped with negative lug and positive pole ear, box hat top is also provided with slot rolling, this slot rolling forms an annular limiting stand on box hat inwall, described this limiting stand of block butt.
When assembling, battery core is inserted in box hat, from the central through hole of battery core by the negative lug of battery core and box hat bottom welding, again the positive pole ear of battery core is welded on to block bottom, and block is inserted in box hat and butt limiting stand, finally utilize sealing die to make to exceed the box hat head calendering distortion of block, bend inwards, complete sealing.
Existing sealing die generally comprises clamping and two parts of die, and the structure of die generally as shown in Figure 5.As seen from Figure 5, one end of this die is connected with forcing press or cylinder, and the other end is provided with the die cavity 101 that holds box hat head, and the face that die cavity 101 bottoms contact with box hat head is arcwall face 102.When sealing, forming cover half (being clamped in the slot rolling place of box hat) by the fixing box hat of clamping, is dynamic model by the die of forcing press or air cylinder driven, and the center of the center of box hat and die cavity 101 is on same axis; Under the effect of forcing press or cylinder, die moves right, and box hat head is included in die cavity 101, and box hat head pressurized bends inwards along arcwall face 102, completes sealing.
Because the box hat of existing a lot of cylinder type lithium batteries is usually " two-part ", the latter half of box hat sidewall is thinner, and to increase battery capacity, the sidewall of the first half is thicker, ensureing sealing, avoids occurring leaking in following process or in using.In the time utilizing above-mentioned sealing die to seal, box hat head is fixing in die cavity almost to carry out with two steps of calendering distortion simultaneously, the middle time that there is no delay, after sealing, very easily cause box hat head outer diameter to expand even " fried mouth ", or seam crossing or the thinner part of sidewall at box hat produce fold, and battery is scrapped.
Utility model content
The utility model discloses a kind of cylinder type lithium battery sealing die, utilize this sealing die cylinder type lithium battery to be sealed to the phenomenon that there will not be box hat fold, external diameter expansion or fried mouth.
The technical solution of the utility model is:
A kind of cylinder type lithium battery sealing die; comprise the clamping for fixing box hat; and for rolling the die of box hat head; described die comprises the inner core, buffer protection cover and the adapter sleeve that from inside to outside coaxially wear successively; this buffer protection cover is slidably matched with inner core, adapter sleeve respectively; described buffer protection cover comprises elastic washer and the protective jacket along inner core axial distribution, and the inwall of this protective jacket and the bottom surface of inner core surround the die cavity that holds box hat head, and the bottom surface of inner core is arcwall face.
When sealing, box hat head enters die cavity against inner core bottom surface, and clamping is clamped in the slot rolling place of box hat, the base abuts clamping of protective jacket, and box hat head is firmly fixed in die cavity; Due to the effect of elastic washer, now the pressure of inner core (from the forcing press being connected with inner core or cylinder) is not also applied on box hat head, but received by elastic washer, elastic washer compressive deformation, protective jacket is separated because being free to slide with clamping, now the pressure of inner core is released and is applied directly to box hat head, and pressure impels box hat head calendering distortion, inwardly turns down along the arcwall face of inner core.
Sealing die of the present utility model by fixing in die cavity box hat head in sealing process, two steps of compressive deformation cut from, in calendering deformation process, box hat is fixed by protective jacket, there will not be box hat fold, box hat head outer diameter to expand or the phenomenon of fried mouth.
Same as the prior art, clamping is fixed on the slot rolling place of box hat, in case slot rolling place stress is too large and occur fold or break when box hat pressurized.
As preferably, described elastic washer is spring coil or gum cover.More preferably gum cover.Gum cover not only possesses certain buffer capacity, smoothly performing step cut from, and possess certain intensity, both can ensure the buffering of pressure, not yielding yet, extend using period.
In the utility model, be provided with annular limited step around described adapter sleeve inner chamber top, the middle part of described inner core be provided with this limited step against the shaft shoulder, described elastic washer is against this shaft shoulder.Limited restriction of the shaft shoulder cannot move down separately inner core, is completely fixed to before in die cavity at box hat head, and inner core can not be applied to pressure box hat head.Elastic washer, against this shaft shoulder, can be accepted the pressure of inner core.
Elastic washer and protective jacket are set in successively on inner core and form buffer protection cover, and for ensureing that buffer protection cover can be in axial sliding along inner core, the utility model utilizes adapter sleeve and inner core to surround spatial accommodation, and elastic washer and protective jacket are placed in this spatial accommodation.In the utility model, the structure of this spatial accommodation is by following 2 realizations:
The first, described inner core is provided with the first location hole that runs through the shaft shoulder, and described adapter sleeve is provided with the second location hole of setting corresponding to this first location hole, in the first location hole and the second location hole, is equipped with circumferential alignment pin.
As preferably, the two ends of described circumferential alignment pin are provided with anti-falling piece.Prevent that circumferential alignment pin is from landing in the first location hole and the second location hole.Described anti-falling piece can be selected clamp nut or silica gel sheath.
The second, between described protective jacket and adapter sleeve, be provided with axial limiting part.
As preferably, described axial limiting part is the flanging of protective jacket near elastic washer one end, and the in-flanges of the adapter sleeve matching with this flanging bottom.Utilize circumferential alignment pin that adapter sleeve and inner core are fixed, prevent adapter sleeve slippage; Utilize the flanging of protective jacket and the in-flanges of adapter sleeve to match and prevent protective jacket slippage.
For ease of by the installation of sealing die, the center of described inner core is provided with the 3rd location hole, in the 3rd location hole, axial location pin is installed, and described axial location pin is provided with the pin-and-hole passing for described circumferential alignment pin.In the 3rd location hole, installation shaft, to alignment pin, is fixed on inner core on forcing press or cylinder; Because the first location hole is also through the center of inner core, the pin-and-hole on axial location pin can avoid hindering the installation of circumferential alignment pin.Circumferentially alignment pin passes in this pin-and-hole, also can prevent the slippage of axial location pin.
When assembling, first axial location pin is packed in the 3rd location hole, axial location pin stretches out from inner core top through the 3rd location hole; Then elastic washer and protective jacket are set on inner core successively, elastic washer is against the shaft shoulder of inner core; Sheathed adapter sleeve again, the flanging of adapter sleeve base abuts protective jacket, the limiting stand on top is against the shaft shoulder of inner core; Then the pin-and-hole of the first location hole, the second location hole and axial location pin is aligned, penetrate circumferential alignment pin and utilize anticreep to be fixed, obtain described die; Finally utilize axial location pin that die is fixed on forcing press or cylinder, complete installation.
Compared with prior art, the beneficial effects of the utility model are embodied in:
Sealing die of the present utility model first utilizes inner core, protective jacket and clamping that box hat head is fixed in die cavity, and the elastic washer of recycling compressive deformation makes box hat head be subject to the pressure of inner core and rolls and be out of shape sealing; In sealing process fixing in die cavity, two steps of compressive deformation of box hat head cut from, when box hat head pressurized, surrounded fixingly by protective jacket, avoided the situation of external diameter expansion, fried mouth and fold to occur.
Brief description of the drawings
Fig. 1 is the blast structure chart of a kind of cylinder type lithium battery sealing die of the utility model;
Fig. 2 is the assembling assumption diagram of a kind of cylinder type lithium battery sealing die of the utility model;
Fig. 3 is the A-A cutaway view in Fig. 2;
Fig. 4 is the enlarged drawing of B part in Fig. 3;
Fig. 5 is the structural representation of sealing die in prior art.
Embodiment
As shown in figures 1 and 3, a kind of cylinder type lithium battery sealing die of the utility model, comprises the clamping 6 for fixing box hat 7, and for rolling the die of box hat head 72, die comprises the inner core 1 from inside to outside coaxially wearing successively, gum cover 2 and protective jacket 3, adapter sleeve 4.
From Fig. 1 and Fig. 3, be provided with annular stop platform 42 around adapter sleeve 4 inner chamber tops, the middle part of inner core 1 is with the shaft shoulder 14 leaning with this limiting stand 42, in the shaft shoulder 14, be provided with the first location hole 12, adapter sleeve 4 is provided with the second location hole 41 of a pair of setting corresponding to the first location hole 12, in the first location hole 12 and the second location hole 41, be equipped with circumferential alignment pin 5, inner core 1 and adapter sleeve 4 are fixed.
For preventing circumferential alignment pin 5 landings, circumferentially the two ends of alignment pin 5 are with silica gel sheath 51.
As shown in Figure 3, gum cover 2 and protective jacket 3 are set on inner core 1 successively, and are slidably matched with inner core 1, adapter sleeve 4 respectively, and gum cover 2 is against the shaft shoulder 14; Protective jacket 3 is provided with flanging 32 near one end of gum cover 2, and this flanging 32 leans with the in-flanges 43 of adapter sleeve 4 bottoms.So gum cover 2 and protective jacket 3 can be fixed in the spatial accommodation that inner core 1 and adapter sleeve 4 surround, the bottom surface of the inwall of protective jacket 3 and inner core 1 surrounds die cavity 31, for holding box hat head 72 in sealing process.Clamping 6 and die cavity 31 are on same axis.
As seen from Figure 4, the bottom surface of inner core 1 is arcwall face 11, and when sealing, box hat head 72 can bend inwards along arcwall face 11, realizes sealing.
From Fig. 1, Fig. 3 and Fig. 4, the center of inner core 1 is provided with in the 3rd location hole 13, the three location holes 13 and is provided with for inner core 1 being fixed on to the axial location pin (omitting in figure) on forcing press or cylinder (figure omits).
As shown in Figure 1, when assembling, first axial location pin is packed in the 3rd location hole 13, axial location pin stretches out from inner core 1 top through the 3rd location hole 13; Then gum cover 2 and protective jacket 3 are set on inner core 1 successively, gum cover 2 is against the shaft shoulder 14 of inner core 1; Sheathed adapter sleeve 4 again, the in-flanges 43 of adapter sleeve 4 bottoms is against the flanging 32 of protective jacket 3, and the limiting stand 42 on adapter sleeve 4 tops is against the shaft shoulder 14 of inner core 1; Then the pin-and-hole (omitting in figure) of the first location hole 12, the second location hole 41 and axial location pin is aligned, penetrate circumferential alignment pin and utilize silica gel sheath 51 to be fixed, obtain die; Finally utilize axial location pin that die is fixed on forcing press or cylinder, complete installation.
As shown in Figure 4, when sealing, the slot rolling of box hat 7 71 is fixed on to the interior composition cover half of clamping 6, forcing press or the motion of air cylinder driven die are dynamic model; Dynamic model right lateral, includes box hat head 72 in die cavity 31 in, and top is against arcwall face 11, and sidewall is held tightly by protective jacket 3, the bottom of protective jacket 3 and clamping 6 against; Due to the effect of gum cover 2, the pressure of inner core 1 is not now also applied directly to box hat head 72, but received by gum cover 2, gum cover 2 compressive deformations, vacate activity space to protective jacket 3, and protective jacket 3 slides and separates with clamping 6 left along inner core 2, now dynamic model continues right lateral, the pressure of inner core 1 is applied to box hat head 72, after the 72 calendering distortion of box hat head, bends inwards, and completes sealing.
Claims (8)
1. a cylinder type lithium battery sealing die; comprise the clamping for fixing box hat; and for rolling the die of box hat head; it is characterized in that; described die comprises the inner core, buffer protection cover and the adapter sleeve that from inside to outside coaxially wear successively; this buffer protection cover is slidably matched with inner core, adapter sleeve respectively; described buffer protection cover comprises elastic washer and the protective jacket along inner core axial distribution; the inwall of this protective jacket and the bottom surface of inner core surround the die cavity that holds box hat head, and the bottom surface of inner core is arcwall face.
2. cylinder type lithium battery sealing die as claimed in claim 1, is characterized in that, is provided with annular limited step around described adapter sleeve inner chamber top, the middle part of described inner core be provided with this limited step against the shaft shoulder, described elastic washer is against this shaft shoulder.
3. cylinder type lithium battery sealing die as claimed in claim 1, is characterized in that, described elastic washer is spring coil or gum cover.
4. cylinder type lithium battery sealing die as claimed in claim 1, it is characterized in that, described inner core is provided with the first location hole that runs through the shaft shoulder, described adapter sleeve is provided with the second location hole of a pair of setting corresponding to this first location hole, in the first location hole and the second location hole, is equipped with circumferential alignment pin.
5. cylinder type lithium battery sealing die as claimed in claim 4, is characterized in that, the two ends of described circumferential alignment pin are provided with anti-falling piece.
6. cylinder type lithium battery sealing die as claimed in claim 1, is characterized in that, is provided with axial limiting part between described protective jacket and adapter sleeve.
7. cylinder type lithium battery sealing die as claimed in claim 6, is characterized in that, described axial limiting part is the flanging of protective jacket near elastic washer one end, and the in-flanges of the adapter sleeve matching with this flanging bottom.
8. cylinder type lithium battery sealing die as claimed in claim 1, is characterized in that, the center of described inner core is provided with the 3rd location hole, in the 3rd location hole, axial location pin is installed, and described axial location pin is provided with the pin-and-hole passing for described axial location pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320763777.4U CN203690421U (en) | 2013-11-27 | 2013-11-27 | Cylindrical sealing die of lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320763777.4U CN203690421U (en) | 2013-11-27 | 2013-11-27 | Cylindrical sealing die of lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203690421U true CN203690421U (en) | 2014-07-02 |
Family
ID=51012291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320763777.4U Expired - Lifetime CN203690421U (en) | 2013-11-27 | 2013-11-27 | Cylindrical sealing die of lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203690421U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098109A (en) * | 2015-07-27 | 2015-11-25 | 厦门华锂能源有限公司 | Seal connecting assembly and seal mould composing by same |
| CN106602146A (en) * | 2017-02-22 | 2017-04-26 | 山东精工电子科技有限公司 | Sealing combined upper die for cylindrical steel shell lithium battery |
| CN109830753A (en) * | 2018-12-19 | 2019-05-31 | 无锡先导智能装备股份有限公司 | A kind of fixture and sealing device |
-
2013
- 2013-11-27 CN CN201320763777.4U patent/CN203690421U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098109A (en) * | 2015-07-27 | 2015-11-25 | 厦门华锂能源有限公司 | Seal connecting assembly and seal mould composing by same |
| CN106602146A (en) * | 2017-02-22 | 2017-04-26 | 山东精工电子科技有限公司 | Sealing combined upper die for cylindrical steel shell lithium battery |
| CN106602146B (en) * | 2017-02-22 | 2019-01-25 | 山东精工电子科技有限公司 | A kind of cylindrical steel shell lithium battery seal combination upper mold |
| CN109830753A (en) * | 2018-12-19 | 2019-05-31 | 无锡先导智能装备股份有限公司 | A kind of fixture and sealing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 313100 Huzhou Province, Changxing County, painted Creek Industrial Park, Bao bridge road, No. 18 Patentee after: ZHEJIANG TIANNENG ENERGY TECHNOLOGY Co.,Ltd. Address before: 313100 Huzhou Province, Changxing County, painted Creek Industrial Park, Bao bridge road, No. 18 Patentee before: ZHEJIANG TIANNENG ENERGY TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee after: Tianneng Shuai Fude Energy Co.,Ltd. Address before: 313100, No. 18, Qiao Qiao Road, Changxing County painting industrial park, Zhejiang, Huzhou Patentee before: ZHEJIANG TIANNENG ENERGY TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140702 |