CN116329733B - Battery box friction welding frock - Google Patents
Battery box friction welding frock Download PDFInfo
- Publication number
- CN116329733B CN116329733B CN202310395179.4A CN202310395179A CN116329733B CN 116329733 B CN116329733 B CN 116329733B CN 202310395179 A CN202310395179 A CN 202310395179A CN 116329733 B CN116329733 B CN 116329733B
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- China
- Prior art keywords
- battery box
- plate
- fixed
- friction welding
- bottom plate
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- 238000003466 welding Methods 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 16
- 238000003825 pressing Methods 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 6
- 230000002950 deficient Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 210000001503 joint Anatomy 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
- B23K20/122—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding
- B23K20/1245—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding using a non-consumable tool, e.g. friction stir welding characterised by the apparatus
- B23K20/126—Workpiece support, i.e. backing or clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Battery Mounting, Suspending (AREA)
Abstract
The application relates to the technical field of welding tools, in particular to a friction welding tool for a battery box, which comprises a fixed base plate, a fixed support plate, a fixed panel, an air cylinder, a positioning support block and a limiting side plate, wherein the lower end of the fixed support plate is fixedly connected to the end part of the fixed base plate; an accommodating chamber is formed between the fixed substrate and the fixed panel. The application provides a friction welding tool for a battery box, which is wide in application range, convenient and quick to adjust and capable of improving the welding efficiency of the battery box, and for frames with different width specifications, a push plate is used for horizontally lifting a bottom plate of the battery box to the level height of the upper end part of the frame; and the limit side plates limit the direction of the frame to be vertical, and the air cylinder horizontally lifts the bottom plate of the battery box, so that the perpendicularity of the bottom plate of the battery box and the welding of the frame is ensured, the welding precision of the battery box is improved, defective products are reduced, and the welding quality is improved.
Description
Technical Field
The application relates to the technical field of battery box welding, in particular to a battery box friction welding tool.
Background
The welding is a main connecting process in the processing process of the battery box body, more welding technologies used in the production of the battery box at present comprise traditional welding, friction stir welding, laser welding and the like, and the friction stir welding is applied to the aluminum alloy battery box body on a large scale due to the advantages of high applicability, high quality of welding joints, low cost, convenience in automation and the like. Because of the welding assembly requirement, the welding part is mainly concentrated on the butt welding of the bottom plate section bar and the welding of the frame and the bottom plate assembly at present. The bottom plate section bars are spliced and welded into a butt joint mode, and normally, front and back double-sided welding is carried out; the frame and the bottom plate assembly are welded in a bottom locking joint form or a butt joint form, the bottom locking joint form is welded on one side, and the butt joint form is welded on the front side and the back side. Because the battery box is bigger, the friction welding tool is complex to install when in use, the positioning is inaccurate, the production efficiency is low, and the cost is high.
Disclosure of Invention
The application provides a friction welding tool for a battery box, which is used for fixing a battery box bottom plate and a frame, ensuring the perpendicularity of the battery box bottom plate and the frame, and is simple to install and high in efficiency.
The following technical scheme is adopted:
a friction welding tool for a battery box comprises a fixed base plate, a fixed support plate, a fixed panel, an air cylinder, a positioning support block and a limiting side plate, wherein the lower end of the fixed support plate is fixedly connected to the end part of the fixed base plate;
the air cylinder comprises an air cylinder base fixedly arranged on the fixed base plate, an air cylinder telescopic rod arranged on the air cylinder base and a push plate fixedly connected to the end part of the air cylinder telescopic rod;
the pushing plate is used for placing a bottom plate of the battery box;
the cylinder telescopic rod penetrates through the fixed panel, and the push plate is positioned above the fixed panel of the accommodating chamber;
the fixing panel is provided with a yielding hole, and the positioning support block comprises a support block body and a sinking groove arranged on the support block body; the sinking groove is arranged opposite to the yielding hole.
By adopting the technical scheme, the lifting of the telescopic rod of the air cylinder is controlled, so that the frame with different width specifications has wide application range, is automatically operated, and is convenient and quick to adjust; and the limit side plates limit the frame direction to be vertical, so that the perpendicularity of the bottom plate of the battery box and the welding of the frame is ensured.
Optionally, the number of the positioning support blocks is two, two positioning grooves for placing the frame are formed in the fixing panel, and the two positioning grooves are respectively located on the inner sides of the two limiting side plates;
the number of the air cylinders is more than two, and the positions of the air cylinders are located between the two positioning grooves.
Optionally, the support block body is fixedly connected to the lower surface of the fixed panel.
By adopting the technical scheme, the positions of the frames are accurately positioned through the positioning grooves, and the lower ends of the frames are tightly attached to the limiting side plates.
Optionally, the screw rod is connected with the rotation on the bottom surface of riding block body, fixed nut with screw rod threaded connection is fixedly installed on the fixed base plate, set up the screw corresponding with the screw rod on the fixed base plate.
By adopting the technical scheme, the height of the supporting block body can be adjusted by rotating the screw, so that the positions of the limiting side plates and the frame can be adjusted, and the welding operation is facilitated.
Optionally, a vertical chute is formed on the supporting block body, and a sliding rod opposite to the chute is fixedly connected to the end face of the fixing nut.
By adopting the technical scheme, the sliding rod slides in the sliding groove to play a role in guiding the movement direction of the supporting block body.
Optionally, the lower extreme fixedly connected with of screw rod is located the end plate of fixed base plate below, set up horizontal through-hole on the end plate.
By adopting the technical scheme, the operation rod is inserted into the through hole, so that the screw rod can be rotated conveniently.
Optionally, a storage groove for storing the push plate is formed in the fixed panel.
By adopting the technical scheme, the push plate can be stored in the storage groove, and the flatness of the fixed panel is ensured when the cylinder is in a contracted state.
Optionally, a position sensor attached to the side edge of the chute is fixedly installed on the fixed panel.
By adopting the technical scheme, the position of the bottom plate of the battery box is detected by the position sensor, so that the position level of the bottom plate of the battery box is ensured.
Optionally, the number of the positioning support blocks is four, one positioning support block is arranged at one side end of the fixed substrate, and the other three positioning support blocks are arranged at the other side end of the fixed substrate at intervals.
By adopting the technical scheme, the welding positioning device can be suitable for welding positioning of the bottom plates and the frames of the battery boxes with three different specifications, and the application range of the tool is improved
Optionally, the battery box further comprises a pressing part positioned above the bottom plate of the battery box;
the pressing part comprises a pressing plate pressed on the upper surface of the bottom plate of the battery box and a lifting arm fixedly connected to the upper end of the pressing plate.
By adopting the technical proposal, the three pressing plates are uniformly pressed on the upper surface of the bottom plate of the battery box by adjusting the horizontal position of the lifting arm, the pressing part enhances the stability of the bottom plate of the battery box in the lifting state,
in summary, the present application includes at least one of the following beneficial technical effects:
the application provides a friction welding tool for a battery box, which is wide in application range, convenient and quick to adjust and capable of improving the welding efficiency of the battery box, and for frames with different width specifications, a push plate is used for horizontally lifting a bottom plate of the battery box to the level height of the upper end part of the frame; and the limit side plates limit the direction of the frame to be vertical, and the air cylinder horizontally lifts the bottom plate of the battery box, so that the perpendicularity of the bottom plate of the battery box and the welding of the frame is ensured, the welding precision of the battery box is improved, defective products are reduced, and the welding quality is improved.
Drawings
FIG. 1 is a schematic structural view of a first embodiment;
FIG. 2 is a schematic diagram of the structure of a second embodiment;
FIG. 3 is a schematic structural view of a third embodiment;
FIG. 4 is an enlarged schematic view of portion A of FIG. 3;
fig. 5 is a schematic structural view of a fourth embodiment;
fig. 6 is a structural schematic diagram of a battery case bottom plate lifted state of the fourth embodiment;
fig. 7 is a schematic structural view of a pressing portion of the fourth embodiment;
fig. 8 is a schematic structural diagram of a fifth embodiment.
Reference numerals illustrate: 1. fixing the substrate; 2. fixing the support plate; 3. fixing the panel; 4. a cylinder base; 5. a cylinder telescopic rod; 6. a push plate; 7. positioning support blocks; 8. a limit side plate; 9. a battery case bottom plate; 10. a frame; 11. a housing chamber; 12. a fixing nut; 13. a screw; 14. an end plate; 15. a through hole; 16. a slide bar; 17. a chute; 18. a support leg; 19. a baseboard; 20. a storage groove; 21. a position sensor; 22. a pressing plate; 23. and a lifting arm.
Detailed Description
The application is described in further detail below with reference to fig. 1-8.
Example 1
As shown in fig. 1, a friction welding tool for a battery box comprises a fixed base plate 1, a fixed support plate 2, a fixed panel 3, an air cylinder, a positioning support block 7 and a limiting side plate 8, wherein the lower end of the fixed support plate 2 is fixedly connected to the end part of the fixed base plate 1, the fixed panel 3 is fixedly connected to the upper end of the fixed support plate 2, the air cylinder is arranged between the fixed base plate 1 and the fixed panel 3, the positioning support block 7 is arranged on the fixed panel 3, and the limiting side plate 8 is fixedly arranged on the positioning support block 7;
a containing cavity 11 is formed between the fixed base plate 1 and the fixed panel 3, and the air cylinder comprises an air cylinder base 4 fixedly installed on the fixed base plate 1, an air cylinder telescopic rod 5 installed on the air cylinder base 4 and a push plate 6 fixedly connected to the end part of the air cylinder telescopic rod 5;
the pushing plate 6 is used for placing a battery box bottom plate 9;
the cylinder telescopic rod 5 penetrates through the fixed panel 3, and the push plate 6 is positioned above the fixed panel 3 of the accommodating cavity 11;
the fixed panel 3 is provided with a yielding hole, and the positioning support block 7 comprises a support block body and a sinking groove arranged on the support block body; the sinking groove is arranged opposite to the yielding hole.
According to the embodiment, the lifting of the cylinder telescopic rod 5 is controlled, and for frames 10 with different width specifications, the push plate 6 is used for horizontally lifting the battery box bottom plate 9 to the level height of the upper end part of the frame 10, so that the application range is wide, the automatic operation is realized, and the adjustment is convenient and quick; and the limit side plates 8 limit the direction of the frame 10 to be vertical, and the air cylinders horizontally lift the battery box bottom plate 9, so that the welding verticality of the battery box bottom plate 9 and the frame 10 is ensured.
Specifically, the support block body fixed connection is at fixed panel 3 lower surface, and support block body and fixed panel 3 fixed position support spacing curb plate 8.
Specifically, the number of the positioning support blocks 7 is two, two positioning grooves for placing the frame 10 are formed in the fixing panel 3, and the two positioning grooves are respectively located on the inner sides of the two limiting side plates 8;
the number of the air cylinders is more than two, and the positions of the air cylinders are located between the two positioning grooves.
In this embodiment, the positioning groove is used to accurately position the frame 10, and the lower end of the frame 10 is limited by the positioning groove, so as to ensure that the lower end of the frame 10 is tightly attached to the limiting side plate 8.
Example two
As shown in fig. 2, the difference between the present embodiment and the first embodiment is that the supporting block body is not fixedly connected with the fixing panel 3, in order to provide a supporting force for the limiting side plate 8, specifically, a structure is adopted in which a screw 13 is rotatably connected to the bottom surface of the supporting block body, a fixing nut 12 screwed with the screw 13 is fixedly installed on the fixing substrate 1, and a screw hole corresponding to the screw 13 is formed on the fixing substrate 1.
In this embodiment, the height of the supporting block body can be adjusted by rotating the screw 13, so that the positions of the limiting side plates 8 and the frame 10 are adjusted, when the limiting side plates 8 are higher than the frame 10, the welding with the battery box bottom plate 8 is inconvenient, and the height of the limiting side plates 8 slightly lower than the frame 10 can be adjusted through this embodiment, so that the welding operation is convenient.
Specifically, a vertical chute 17 is formed on the supporting block body, and a sliding rod 16 opposite to the chute 17 is fixedly connected to the end surface of the fixing nut 12.
In the embodiment, the sliding rod 6 slides in the sliding groove 17 to play a role in guiding the movement direction of the supporting block body, so that the limiting side plate 8 is ensured to be adjusted along with the vertical direction of the positioning supporting block 7.
Specifically, the lower end of the screw 13 is fixedly connected with an end plate 14 located below the fixed substrate 1, and a transverse through hole 15 is formed in the end plate 14.
In this embodiment, the operation rod is inserted into the through hole 15 to facilitate the rotation of the screw 13.
Example III
As shown in fig. 3 and 4, this embodiment is further optimized based on the second embodiment, specifically, the fixing panel 3 is provided with a receiving groove 20 for receiving the push plate 6.
In this embodiment, the push plate 6 can be stored in the storage groove 20, and when the air cylinders are in a contracted state, the air pressure does not need to be continuously supplied, and the positions of the push plates 6 of the plurality of air cylinders are kept at the same horizontal plane with the fixed panel 3 by the storage groove 20, so that the flatness of the fixed panel is ensured, and the placement of the battery box bottom plate 8 is stable.
Specifically, the fixed panel 3 is fixedly provided with a position sensor 21 which is abutted against the side edge of the chute 17.
In this embodiment, the position of the battery box bottom plate 9 is detected by the position sensors 21, the position sensors 21 may be infrared sensors, specifically, the position sensors 21 may be respectively disposed at four corners of the battery box bottom plate 9, the battery box bottom plate 9 is a flat plate, and when one or more position sensors 21 cannot detect the position of the battery box bottom plate 9, the battery box bottom plate 9 is not in a horizontal state, so that an alarm is sent to timely perform position adjustment, and the position level of the battery box bottom plate 9 is ensured.
Example IV
As shown in fig. 5, the embodiment is further expanded on the basis of the third embodiment, and can be suitable for welding positioning of the battery box bottom plates 9 and the frames 10 with three different specifications, so that the application range of the tool is improved, one tool meets the application of the three battery box bottom plates 9, new welding tools are not required to be manufactured again for each battery box bottom plate 9, and the manufacturing and production cost is reduced. Specifically, the number of the positioning support blocks 7 is four, one positioning support block 7 is arranged at one side end of the fixed substrate 1, and the other three positioning support blocks 7 are arranged at the other side end of the fixed substrate 1 at intervals.
Fig. 6 is a schematic view showing a structure of the battery case bottom plate 9 of the minimum length specification of the present embodiment in a lifted state.
Example five
In order to enhance the stability of the battery case bottom plate 9 in the raised state, in the first to fourth embodiments, the pressing portion above the battery case bottom plate 9 may be added;
the pressing part comprises a pressing plate 22 pressed on the upper surface of the battery box bottom plate 9 and a lifting arm 23 fixedly connected to the upper end surface of the pressing plate 22.
As shown in fig. 7, this embodiment is a schematic structural diagram of the pressurizing and holding part added on the basis of the fourth embodiment, and three pressing plates 22 are uniformly pressed and held on the upper surface of the bottom plate 9 of the battery case, so as to ensure that the bottom plate 9 of the battery case is stressed uniformly.
As shown in fig. 8, when the tooling of the fourth embodiment is applied to the welding positioning of the maximum-sized battery box bottom plate 9 and the frame 10, the three pressing plates 22 are uniformly pressed on the upper surface of the battery box bottom plate 9 by adjusting the horizontal position of the lifting arm 23.
The embodiments of the present application are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in this way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (8)
1. A friction welding tool for a battery box is characterized in that: the device comprises a fixed substrate (1), a fixed support plate (2) with the lower end fixedly connected to the end part of the fixed substrate (1), a fixed panel (3) fixedly connected to the upper end of the fixed support plate (2), an air cylinder arranged between the fixed substrate (1) and the fixed panel (3), a positioning support block (7) arranged on the fixed panel (3) and a limiting side plate (8) fixedly arranged on the positioning support block (7);
a containing cavity (11) is formed between the fixed base plate (1) and the fixed panel (3), and the air cylinder comprises an air cylinder base (4) fixedly installed on the fixed base plate (1), an air cylinder telescopic rod (5) installed on the air cylinder base (4) and a push plate (6) fixedly connected to the end part of the air cylinder telescopic rod (5);
the pushing plate (6) is used for placing a battery box bottom plate (9);
the cylinder telescopic rod (5) penetrates through the fixed panel (3), and the push plate (6) is positioned above the fixed panel (3) of the accommodating cavity (11);
the fixing panel (3) is provided with a yielding hole, and the positioning support block (7) comprises a support block body and a sinking groove arranged on the support block body; the sinking groove is arranged opposite to the yielding hole;
the bottom surface of the supporting block body is rotationally connected with a screw rod (13), a fixed nut (12) in threaded connection with the screw rod (13) is fixedly arranged on the fixed substrate (1), and a screw hole corresponding to the screw rod (13) is formed in the fixed substrate (1);
the number of the positioning support blocks (7) is two, two positioning grooves for placing the frames (10) are formed in the fixed panel (3), and the two positioning grooves are respectively positioned on the inner sides of the two limiting side plates (8);
the number of the air cylinders is more than two, and the positions of the air cylinders are located between the two positioning grooves.
2. The battery box friction welding tool according to claim 1, wherein: the support block body is fixedly connected to the lower surface of the fixed panel (3).
3. The battery box friction welding tool according to claim 1, wherein: the support block body is provided with a vertical sliding groove (17), and a sliding rod (16) opposite to the sliding groove (17) is fixedly connected to the end face of the fixing nut (12).
4. A battery compartment friction welding tool as recited in claim 3, wherein: the lower end of the screw rod (13) is fixedly connected with an end plate (14) positioned below the fixed base plate (1), and a transverse through hole (15) is formed in the end plate (14).
5. The battery box friction welding tool according to claim 1, wherein: the fixing panel (3) is provided with a storage groove (20) for storing the push plate (6).
6. The battery box friction welding tool according to claim 5, wherein: the fixed panel (3) is fixedly provided with a position sensor (21) which is attached to the side edge of the chute (17).
7. The battery box friction welding tool according to claim 6, wherein: the number of the positioning support blocks (7) is four, one positioning support block (7) is arranged at one side end of the fixed substrate (1), and the other three positioning support blocks (7) are arranged at the other side end of the fixed substrate (1) at intervals.
8. The battery box friction welding tool according to any one of claims 1-7, wherein: the battery box also comprises a pressing part positioned above the battery box bottom plate (9);
the pressing part comprises a pressing plate (22) pressed on the upper surface of the bottom plate (9) of the battery box and a lifting arm (23) fixedly connected to the upper end surface of the pressing plate (22).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310395179.4A CN116329733B (en) | 2023-04-13 | 2023-04-13 | Battery box friction welding frock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310395179.4A CN116329733B (en) | 2023-04-13 | 2023-04-13 | Battery box friction welding frock |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116329733A CN116329733A (en) | 2023-06-27 |
| CN116329733B true CN116329733B (en) | 2023-12-08 |
Family
ID=86887825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310395179.4A Active CN116329733B (en) | 2023-04-13 | 2023-04-13 | Battery box friction welding frock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116329733B (en) |
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| CN214322290U (en) * | 2020-11-26 | 2021-10-01 | 无锡市群毅精工机械有限公司 | Automatic production line for end cover steel structure |
| CN215966661U (en) * | 2021-09-29 | 2022-03-08 | 河北津西钢铁集团重工科技有限公司 | Workpiece fixing device and sawing machine |
| CN114843660A (en) * | 2022-06-06 | 2022-08-02 | 重庆新铝时代科技股份有限公司 | Manufacturing process of new energy battery box based on extruded section |
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2023
- 2023-04-13 CN CN202310395179.4A patent/CN116329733B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106784505A (en) * | 2017-02-24 | 2017-05-31 | 天津锐新昌轻合金股份有限公司 | A kind of new-energy automobile aluminum alloy battery casing and preparation method thereof |
| CN207637914U (en) * | 2017-12-08 | 2018-07-20 | 安徽沃特玛新能源电池有限公司 | A kind of automatic guiding positioning carrier |
| CN107790950A (en) * | 2017-12-14 | 2018-03-13 | 江苏联峰工业设备安装工程有限公司 | Make H profile steel frock |
| CN211866956U (en) * | 2019-11-22 | 2020-11-06 | 大族激光科技产业集团股份有限公司 | Laminate polymer battery module welding jig |
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| CN214322290U (en) * | 2020-11-26 | 2021-10-01 | 无锡市群毅精工机械有限公司 | Automatic production line for end cover steel structure |
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| Publication number | Publication date |
|---|---|
| CN116329733A (en) | 2023-06-27 |
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Effective date of registration: 20240304 Address after: 215000, No. 88 Xiangyuan Road, High tech Industrial Development Zone, Changshu City, Suzhou City, Jiangsu Province Patentee after: Ruixinchang Technology (Changshu) Co.,Ltd. Country or region after: China Address before: No. 326, No. 8, Third Avenue, International Logistics Zone, Tianjin Pilot Free Trade Zone (Airport Economic Zone), Binhai, Tianjin, 300450 (Beichuangyiyuan (Tianjin) Business Secretary Co., Ltd. Trusteeship No. BCY1255) Patentee before: Tianjin Ruixinchang New Energy Technology Co.,Ltd. Country or region before: China |
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