CN111653803B - Sealing method of flow frame of flow battery - Google Patents
Sealing method of flow frame of flow battery Download PDFInfo
- Publication number
- CN111653803B CN111653803B CN202010357883.7A CN202010357883A CN111653803B CN 111653803 B CN111653803 B CN 111653803B CN 202010357883 A CN202010357883 A CN 202010357883A CN 111653803 B CN111653803 B CN 111653803B
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- 238000007789 sealing Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 75
- 239000012943 hotmelt Substances 0.000 claims abstract description 61
- 229910052751 metal Inorganic materials 0.000 claims abstract description 9
- 239000002184 metal Substances 0.000 claims abstract description 9
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 238000010409 ironing Methods 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000003754 machining Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- -1 polyethylene Polymers 0.000 description 3
- 229910052720 vanadium Inorganic materials 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0286—Processes for forming seals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0271—Sealing or supporting means around electrodes, matrices or membranes
- H01M8/0273—Sealing or supporting means around electrodes, matrices or membranes with sealing or supporting means in the form of a frame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/18—Regenerative fuel cells, e.g. redox flow batteries or secondary fuel cells
- H01M8/184—Regeneration by electrochemical means
- H01M8/188—Regeneration by electrochemical means by recharging of redox couples containing fluids; Redox flow type 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
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a sealing method of a flow frame of a flow battery, which comprises the following steps: step S1: sticking the hot melt film on a plane of the cover plate; step S2: placing a metal mould plate on one surface, which is pasted with the hot melt film, of the cover plate, wherein a hollow-out area is arranged on the metal mould plate, and the shape of the hollow-out area is consistent with that of a flow channel of the liquid flow frame; step S3: cutting off the hot melt film on the cover plate corresponding to the position of the hollow area; step S4: and assembling the cover plate and the liquid flow frame to obtain a sealed finished product. The invention realizes the reliable sealing of the liquid flow frame snake-shaped flow channel under the condition of not opening the die by a mode of fusing and attaching the cover plate by the multilayer hot melt film, thereby reducing the cost.
Description
Technical Field
The invention relates to the technical field of flow batteries, in particular to a sealing method of a flow frame of a flow battery.
Background
The all-vanadium redox flow battery is generally used by connecting a plurality of batteries in series in a stacking mode similar to a filter press according to the requirements of power and voltage parameters, the electrolyte in a tank body is continuously pumped into a galvanic pile through a pipeline in a pump circulation mode in the use process, and then the electrolyte returns to a liquid storage tank. Generally, the pressure of the positive electrode and the pressure of the negative electrode among a plurality of batteries can be adjusted by controlling the flow, so that the unidirectional pressure borne by the battery material at the middle part is smaller under the condition that the pressure of the two electrodes is similar, and the liquid leakage can be avoided easily as long as the control is proper in the process stability and the material consistency of the assembly. However, the working condition of the end electrode part of the all-vanadium redox flow battery is greatly different from that of the middle part, and the pressure applied to the end electrode part is often the difference between the pressure in the inner cavity of the battery and the external atmospheric pressure, so that the position of the end electrode, namely the position between the liquid flow frame with the bipolar plates arranged at the two ends and the respective liquid inlet and outlet plates, of the all-vanadium redox flow battery is often one of the most easily-leaked positions, and special consideration needs to be made on the sealing design.
Generally, for the sealing at the end electrode of the flow cell, a special end electrode plate frame without a flow passage is machined according to different end electrode shapes to serve as a separator between electrolyte of a positive electrode and a negative electrode and a current collector, and the sealing is realized by a sealing ring or a welding mode, but the existence of the special end electrode plate frame can also increase the resistance between the end electrode and the current collector by adding a layer of conductive material plate between the bipolar plate frame and the current collector. The most ideal method is to directly contact the existing positive and negative electrode liquid flow frames with the current collector to reduce the resistance of the terminal electrode. However, the flow channel on the flow frame is serpentine and has sealing ribs, which results in a large sealing area and high sealing difficulty of the flow frame. Particularly, the sealing difficulty is extremely high under high pressure, and once leakage occurs, the electrolyte directly corrodes the current collector.
In the prior art, in order to ensure the sealing effect, a special frame plate which is provided with the same sealing ribs and can be matched with the snake-shaped flow channel is usually required, but the manufacturing difficulty and the cost of the frame plate are extremely high. The method for machining and forming is not feasible, because of the existence of the sealing ribs, the sealing ribs are only raised by a few tenths of millimeters and have a plurality of channels, the machining requires that the whole plane is almost milled and only a plurality of sealing ribs are reserved, the required precision is extremely high, the machining difficulty is high, and because the frame plate is made of polyethylene or polypropylene and other general plastics, the material viscosity is high, the milling is not easy, the manufacturing cost is extremely high, and the yield is extremely low. Because the special plate frames are required to be small in quantity, the end electrode of one pile usually only needs one or two pieces of frame plates which have different structural designs, are provided with sealing ribs and can be matched with other injection plate frames to form sealing, and therefore the frame plates are not economical in view of saving cost by opening the molds for injection molding.
In view of the above, it is an urgent problem in the art to overcome the above-mentioned drawbacks of the prior art.
Disclosure of Invention
In order to solve the technical problems of high sealing difficulty and high cost of sealing a flow frame with a snake-shaped flow channel and sealing ribs in the prior art, the invention provides a flow battery flow frame sealing method with low cost and simple process.
In order to achieve the above object, the present invention discloses a sealing method for a flow frame of a flow battery, including the steps of:
step S1: sticking the hot melt film on a plane of the cover plate;
step S2: placing a metal mould plate on one surface of the cover plate, which is stuck with the hot melt film,
a hollow-out area is arranged on the metal mold plate, and the shape of the hollow-out area is consistent with that of a flow channel of the liquid flow frame;
step S3: cutting off the hot melt film on the cover plate corresponding to the position of the hollow area;
step S4: and assembling the cover plate and the liquid flow frame to obtain a sealed finished product.
Further, the runner of liquid flow frame includes the feed liquor runner and goes out the liquid runner, the one end of feed liquor runner is equipped with the feed liquor hole, the one end that goes out the liquid runner is equipped with out the liquid hole, be equipped with the runner hole on the apron, the feed liquor hole go out the liquid hole with runner hole diameter is the same.
Further, the hot melt film is a strong acid resistant hot melt film with a protective paper, and the step S1 specifically includes:
step S11: attaching a plurality of layers of the hot melt film to the plane of the cover plate;
step S12: and ironing the surface of the hot melt film.
Further, a raised sealing rib is arranged on the liquid flow frame, and the step S4 specifically includes:
step S41: tearing off the protective paper on the hot melt film;
step S42: and attaching the cover plate which is torn off the hot melt film protection paper to the flow channel surface of the flow channel frame, which is provided with the flow channel, and pressing and attaching the hot melt film and the sealing ribs.
Further, in the step S42, the flow channel surface is fixed in a position-limiting clamp, and after the hot melt film is completely attached to the flow channel surface of the liquid flow frame, the position-limiting clamp is removed.
Further, in the step S4, after the step S42 is executed, the method further includes:
step S43: and placing the attached cover plate and the liquid flow frame into a hot plate machine or a flat vulcanizing machine for hot pressing, taking out the cover plate and the liquid flow frame, and then carrying out cold pressing to complete the assembly of the cover plate and the liquid flow frame.
Further, after the step S4 is executed, the method further includes,
step S5: and (5) assembling the sealed finished product obtained in the step (S4) with a liquid inlet plate or a liquid outlet plate.
Furthermore, grooves are formed in the liquid inlet plate and the liquid outlet plate, the depth of each groove is matched with the thickness of the cover plate, the length of each groove is smaller than that of the cover plate by 1-2 mm, and the width of each groove is smaller than that of the cover plate by 1-2 mm;
in step S5, one surface of the cover plate of the sealed product is placed in the groove, and the assembly of the sealed product and the liquid inlet plate or the liquid outlet plate is completed.
The technical scheme provided by the invention has the following advantages: reliable sealing of the liquid flow frame snake-shaped flow channel under the condition of no mould opening is realized by a mode of fusing and attaching the multilayer hot melt film to the cover plate, so that the cost is reduced; the risk that electrolyte enters a gap between the hot melt film and the cover plate is eliminated by carving the snake-shaped flow channel on the cover plate, the sealing effect is improved, the flow channel area is increased, and the electrolyte circulation effect is improved; the cover plate is reliably fixed in a mode of carving grooves matched with the cover plate on the liquid inlet plate and the liquid outlet plate, and the overall appearance of the battery with the cover plate is not influenced.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the apparatus and method consistent with the invention and, together with the detailed description, serve to explain the advantages and principles consistent with the invention. In the drawings:
FIG. 1 is an exploded view of a cover plate partially sealed to a liquid inlet channel portion of a liquid flow frame;
FIG. 2 is a schematic cross-sectional view of the cover plate attached to the hot melt film.
Description of the reference numerals
1-cover plate
2-Hot melt film
3-fluid flow frame
11-flow passage hole
21 first Hot melt film
22-second Hot melt film
31-liquid inlet hole
32-liquid inlet flow passage
Detailed Description
Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other, and the technical idea of the present invention may be implemented in combination with other known techniques or other techniques identical to those known techniques.
As shown in fig. 1 and fig. 2, the sealing method for a flow cell flow frame provided by the present invention includes assembling a treated cover plate 1, a hot melt film 2, and a flow frame 3.
The processing of the cover plate 1 and the hot melt film 2 comprises the following steps:
firstly, a cover plate 1 matched with the size of a flow channel surface of a liquid flow frame 3 is manufactured through machining, the cover plate 1 is made of polypropylene plastics and is 2-3 mm thick, and flow channel holes 11 are milled in the cover plate 1.
Next, the hot melt films 2 are repeatedly adhered to one side of the cover plate 1, which are the first hot melt film 21 and the second hot melt film 22, respectively, the second hot melt film 22 is adhered to the cover plate 1, the first hot melt film 21 is adhered to the second hot melt film 22, both of which are strong acid resistant hot melt films, and the first hot melt film 21 is left with protection paper. The surface of the hot melt film 2 is ironed flat by an iron under the condition of keeping the protection paper, and the ironing temperature is 80 ℃.
Then, a metal mold plate is additionally processed, and a hollow-out area is processed on the metal mold plate, wherein the shape of the hollow-out area is consistent with that of the liquid inlet flow passage 32.
And finally, placing the metal mold plate on the surface of the cover plate 1, which is adhered with the hot melt film 2, cutting off the hot melt film 2 corresponding to the position of the liquid inlet flow channel 32 according to the hollow area, and exposing the body material of the cover plate 1.
Assembling the cover plate 1, the hot melt film 2 and the liquid flow frame 3 comprises the following steps:
firstly, the flow channel surface of the liquid flow frame is upwards and fixedly placed in a limiting clamp, and the limiting clamp is provided with a groove capable of accommodating the liquid flow frame.
Then, the protection paper on the first hot melt film 21 is torn off, one side of the cover plate 1, which is attached with the hot melt film 2, is attached to the flow channel surface of the liquid flow frame, a liquid inlet hole 31 on the liquid flow frame corresponds to the flow channel hole 11 on the cover plate 1, the exposed area left by cutting off part of the hot melt film 2 corresponds to the liquid inlet flow channel 32, the hot melt film 1 is pressed and attached to the sealing rib on the liquid flow frame 3, and the limiting clamp is removed after the attachment is completed.
And finally, placing the attached cover plate 1 and the liquid flow frame 3 in a hot plate machine for hot pressing, placing a heating iron plate below the cover plate 1, keeping the temperature at 115 ℃ for 3 minutes under the pressure of 50Kg, removing the heating iron plate, replacing the heating iron plate with an electric wood plate, continuously cold pressing, keeping the pressure at 50Kg for 3 minutes, taking out the cover plate 1, the hot melt film 2 and the liquid flow frame 3 after the assembly is finished, and obtaining a sealed finished product of the liquid flow frame liquid inlet flow channel surface.
Milling a groove with the depth matched with the thickness of the cover plate 1 on the liquid inlet plate, wherein the length and the width of the groove are respectively smaller than the length and the width of the cover plate 1 by 1-2 mm, and placing one side of the cover plate 1 of the sealed finished product in the groove to finish the assembly of the sealed finished product and the liquid inlet plate.
Repeating the above operations to obtain a sealing finished product of the liquid flow frame outlet liquid flow channel surface, and completing the assembly of the sealing finished product and the liquid outlet plate.
Compared with the prior art, the sealing method of the flow battery flow frame provided by the invention has the following advantages: firstly, reliable sealing of the liquid flow frame snake-shaped flow channel under the condition of no mould opening is realized by a mode of fusing and attaching a cover plate through a plurality of layers of hot melt films, so that the cost is reduced; secondly, the risk that electrolyte enters a gap between the hot melt film and the cover plate is eliminated by carving a snake-shaped flow channel on the cover plate, the sealing effect is improved, the flow channel area is increased, and the electrolyte circulation effect is improved; thirdly, reliable fixing of the cover plate is achieved by means of carving grooves matched with the cover plate on the liquid inlet plate and the liquid outlet plate, and the overall appearance of the battery with the cover plate is not affected.
The terms "first" and "second" as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another, unless otherwise specified. Similarly, modifiers similar to "about", "approximately" or "approximately" that occur before a numerical term herein typically include the same number, and their specific meaning should be read in conjunction with the context. Similarly, unless a specific number of a claim recitation is intended to cover both the singular and the plural, and also that claim may include both the singular and the plural.
In the description of the specific embodiments above, the use of the directional terms "upper", "lower", "left", "right", "top", "bottom", "vertical", "transverse", and "lateral", etc., are for convenience of description only and should not be considered limiting.
While specific embodiments of the invention have been described above, it will be understood by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (8)
1. A method for sealing a flow frame of a flow battery is characterized by comprising the following steps:
step S1: sticking the hot melt film on a plane of the cover plate;
step S2: placing a metal mould plate on one surface of the cover plate, which is stuck with the hot melt film,
a hollow-out area is arranged on the metal mold plate, and the shape of the hollow-out area is consistent with that of a flow channel of the liquid flow frame;
step S3: cutting off the hot melt film on the cover plate corresponding to the position of the hollow area;
step S4: assembling the cover plate and the liquid flow frame to obtain a sealed finished product; the hot melt films include a first hot melt film and a second hot melt film;
in the step S1, the second hot-melt film is adhered to the cover plate, the first hot-melt film is adhered to the second hot-melt film, the protection paper is left on the first hot-melt film, and the surfaces of the first hot-melt film and the second hot-melt film are ironed and flattened by an iron under the condition that the protection paper is left.
2. The method for sealing a flow frame of a flow battery as claimed in claim 1, wherein the flow channels of the flow frame include a liquid inlet channel and a liquid outlet channel, a liquid inlet hole is formed at one end of the liquid inlet channel, a liquid outlet hole is formed at one end of the liquid outlet channel, a flow channel hole is formed in the cover plate, and the diameters of the liquid inlet hole, the liquid outlet hole and the flow channel hole are the same.
3. The method for sealing a flow frame of a flow battery as claimed in claim 1, wherein the hot melt film is a strong acid resistant hot melt film with a protective paper, and the step S1 specifically includes:
step S11: attaching a plurality of layers of the hot melt film to the plane of the cover plate;
step S12: and ironing the surface of the hot melt film.
4. The method for sealing a flow frame of a flow battery as claimed in claim 3, wherein the flow frame is provided with raised sealing ribs;
the step S4 specifically includes:
step S41: tearing off the protective paper on the hot melt film;
step S42: and attaching the cover plate which is torn off the hot melt film protection paper to the flow channel surface of the flow channel frame, which is provided with the flow channel, and pressing and attaching the hot melt film and the sealing ribs.
5. The method as claimed in claim 4, wherein in step S42, the flow channel is fixed in a position-limiting clamp with the flow channel facing upward, and the position-limiting clamp is removed after the thermal melting membrane is completely attached to the flow channel.
6. The method for sealing a flow frame of a flow battery as claimed in claim 5, wherein in step S4, after the step S42 is performed, the method further comprises: step S43: and placing the attached cover plate and the liquid flow frame into a hot plate machine or a flat vulcanizing machine for hot pressing, taking out the cover plate and the liquid flow frame, and then carrying out cold pressing to complete the assembly of the cover plate and the liquid flow frame.
7. The method for sealing a flow battery flow frame of claim 1, wherein after the step S4 is executed, the method further comprises,
step S5: and (5) assembling the sealed finished product obtained in the step (S4) with a liquid inlet plate or a liquid outlet plate.
8. The sealing method for the flow battery flow frame as claimed in claim 7, wherein grooves are formed in the liquid inlet plate and the liquid outlet plate, the depth of each groove is matched with the thickness of the cover plate, the length of each groove is smaller than the length of the cover plate and differs by 1-2 mm, and the width of each groove is smaller than the width of the cover plate and differs by 1-2 mm;
in step S5, one side of the cover plate of the sealed product is placed in the groove, and the assembly of the sealed product and the liquid inlet plate or the liquid outlet plate is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357883.7A CN111653803B (en) | 2020-04-29 | 2020-04-29 | Sealing method of flow frame of flow battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010357883.7A CN111653803B (en) | 2020-04-29 | 2020-04-29 | Sealing method of flow frame of flow battery |
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| CN111653803A CN111653803A (en) | 2020-09-11 |
| CN111653803B true CN111653803B (en) | 2022-07-01 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008168448A (en) * | 2007-01-09 | 2008-07-24 | Nok Corp | Manufacturing method of seal part |
| CN107534162A (en) * | 2015-04-30 | 2018-01-02 | 标准能量株式会社 | Redox flow batteries |
| CN107708957A (en) * | 2015-06-29 | 2018-02-16 | Nok株式会社 | The manufacture method of substrate-integrated sealing gasket |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106558662B (en) * | 2015-09-28 | 2019-07-16 | 大连融科储能技术发展有限公司 | Ion-conductive membranes, flow battery and preparation method using the ion-conductive membranes |
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2020
- 2020-04-29 CN CN202010357883.7A patent/CN111653803B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008168448A (en) * | 2007-01-09 | 2008-07-24 | Nok Corp | Manufacturing method of seal part |
| CN107534162A (en) * | 2015-04-30 | 2018-01-02 | 标准能量株式会社 | Redox flow batteries |
| CN107708957A (en) * | 2015-06-29 | 2018-02-16 | Nok株式会社 | The manufacture method of substrate-integrated sealing gasket |
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| CN111653803A (en) | 2020-09-11 |
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Effective date of registration: 20231212 Address after: No. 8 Qianchuan Road, Chaohu Economic Development Zone, Hefei City, Anhui Province, 238014 Patentee after: Shanghai Electric (Anhui) energy storage technology Co.,Ltd. Address before: 30F, No.8 Xingyi Road, Changning District, Shanghai 200050 Patentee before: Shanghai Electric Group Co.,Ltd. |
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