CN115051119A - Lithium ion battery current collection structure - Google Patents
Lithium ion battery current collection structure Download PDFInfo
- Publication number
- CN115051119A CN115051119A CN202210595275.9A CN202210595275A CN115051119A CN 115051119 A CN115051119 A CN 115051119A CN 202210595275 A CN202210595275 A CN 202210595275A CN 115051119 A CN115051119 A CN 115051119A
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- vent
- current collecting
- lithium ion
- ion battery
- disc
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 28
- 238000004804 winding Methods 0.000 claims abstract description 20
- 238000003825 pressing Methods 0.000 claims description 22
- 238000003466 welding Methods 0.000 claims description 16
- 238000004898 kneading Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 235000015110 jellies Nutrition 0.000 description 1
- 239000008274 jelly Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a lithium ion battery current collection structure, which relates to the field of new energy, and comprises the following components: the winding core is provided with tabs at two ends; the first current collecting assembly is arranged at one end of the winding core; the first current collecting assembly is provided with a first vent hole, a second vent hole and a third vent hole, the third vent hole faces the winding core, and the first vent hole deviates from the winding core.
Description
Technical Field
The invention relates to the field of new energy, in particular to a lithium ion battery current collection structure.
Background
The common lithium ion batteries are of three types, namely cylindrical, square and soft package, and the cylindrical lithium ion battery has high energy density due to small redundant space inside the battery and long cycle life due to relatively small expansion of a circular roll core. In cylindrical lithium ion battery, traditional utmost point ear generally all welds 1 ~ 2 on every pole piece, and these 1 ~ 2 utmost point ears are convoluteed at the pole piece and then require to be alignment relation just can the fifty percent discount welding, the cylinder of this kind of 1 ~ 2 utmost point ear structures still wide application in numerous fields such as digital, electric tool, electric automobile now, but, along with the demand to power is higher and higher, the traditional utmost point ear structure of cylinder battery can't satisfy the performance demand, the structure of full utmost point ear begins to appear in the cylinder battery.
The full pole ear of the cylindrical battery generally needs to be kneaded and flattened to form a plane before being welded, the traditional battery structure and instrument can not realize the process, although some newly developed semi-mature instruments can have kneading and flattening actions, the pole ear is not uniformly stressed due to the single kneading and translation action, the kneading and flattening plane of the pole ear is easy to warp, when the inward warping of the kneading and flattening plane of the pole ear leads to being too close to the diaphragm, the diaphragm is easy to melt, the short-circuit risk is large, in addition, the inward or outward warping of the kneading and flattening plane of the pole ear leads to the uneven contact between the kneading and flattening plane of the pole ear and the pole, and further leads to uneven welding.
The pole lugs are flattened, and the pole lugs are likely to be torn and fall off due to overlarge stress at partial positions in the subsequent working process, so that serious safety problems such as short circuit and the like are likely to be caused.
In addition, because the mass flow structure of full utmost point ear is bigger than the weight of traditional utmost point ear, often shakes the operating mode among the power battery service condition for the mass flow structure is used down for a long time and is dropped because unstable, so need strengthen the mechanical stability of mass flow structure.
Disclosure of Invention
The invention aims to provide a lithium ion battery current collecting structure, which enhances the structural stability and the kneading and flat welding effect of the lithium ion battery.
In order to achieve the above purpose, the invention provides the following technical scheme: a lithium ion battery current collection structure, comprising: the winding core is provided with tabs at two ends; the first collecting assembly is arranged at one end of the winding core; wherein, first air vent, second air vent and third air vent have on the first mass flow subassembly, the third air vent orientation roll up the core, first air vent deviates from roll up the core, first air vent, second air vent and third air vent communicate each other.
Further, in the above current collecting structure of the lithium ion battery, the first current collecting assembly includes a pressing plate and a supporting plate, the supporting plate is located between the pressing plate and the winding core, a part of the tab extends into a space between the supporting plate and the pressing plate, the supporting plate is connected to the pressing plate so as to clamp the tab, and the tab is connected to the supporting plate and the pressing plate simultaneously.
Further, in the above-mentioned lithium ion battery current collecting structure, a cavity is provided on the support plate, the third vent is provided on a side wall of the support plate close to the tab, the first vent is provided on a side wall of the support plate far from the tab, and both the third vent and the first vent are communicated with the cavity.
Further, in the above described current collecting structure for a lithium ion battery, the support plate includes a main body portion and a guiding portion, one end of the guiding portion is connected to the main body portion, and the other end of the guiding portion extends toward the winding core; the outer surface of the guide portion gradually shrinks from one end of the guide portion to the other end of the guide portion.
Further, in the above current collecting structure of a lithium ion battery, the first current collecting assembly further includes a vent pipe, one end of the vent pipe is connected to the support plate, the vent pipe is communicated with the cavity, and the other end of the vent pipe is a second vent hole.
Further, in the above current collecting structure for a lithium ion battery, the number of the third air vents is multiple, and the multiple third air vents are uniformly arranged on the guiding portion; the number of the first air vents is multiple, and the multiple first air vents are annularly arranged on the main body part.
Further, in the above current collecting structure for the lithium ion battery, the other end of the vent pipe extends into the central hole of the winding core.
Further, in the above current collecting structure for a lithium ion battery, the central axis of the vent pipe and the central axis of the support plate are located on the same straight line.
Further, in the current collecting structure of the lithium ion battery, the connection mode of the supporting disk and the pressing disk is welding.
The invention can effectively prevent the lug from warping due to the combination of the smooth support plate and the pressing plate, and can quickly and efficiently flatten the lug through the vent pipe, the first vent hole and the third vent hole, thereby improving the production efficiency of the battery.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional structural view of a support disk according to an embodiment of the present invention.
Fig. 3 is a schematic structural front view of a first current collecting assembly according to an embodiment of the present invention.
Fig. 4 is a schematic front view of a structure of a support plate and a vent pipe according to an embodiment of the present invention.
Description of the reference numerals: 1. a winding core; 2. a support disc; 201. a main body portion; 202. a guide section; 3. pressing the disc; 4. a breather pipe; 5. a first vent, 6, a third vent; 7. a cavity; 8. a first current collecting assembly; 9. a second vent; 10. a central bore.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the invention, and not limitation of the invention. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present invention without departing from the scope or spirit thereof. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present invention encompass such modifications and variations as fall within the scope of the appended claims and equivalents thereof.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected," "connected," and "disposed" as used herein are intended to be broadly construed, and may include, for example, fixed connections and removable connections; can be directly connected or indirectly connected through intermediate components; the connection may be a wired electrical connection, a wireless electrical connection, or a wireless communication signal connection, and a person skilled in the art can understand the specific meaning of the above terms according to specific situations.
One or more examples of the invention are illustrated in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to refer to like or similar parts of the invention. As used herein, the terms "first," "second," "third," and "fourth," etc. may be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.
As shown in fig. 1 to 4, according to an embodiment of the present invention, there is provided a current collecting structure of a lithium ion battery, including: the winding core 1 is provided with tabs at two ends of the winding core 1; the first collecting assembly 8 is arranged at one end of the winding core 1; wherein, first blow vent 5, second blow vent 9 and third blow vent 6 have on the first mass flow subassembly 8, and third blow vent 6 is towards rolling up core 1, and first blow vent 5 deviates from and rolls up core 1, first blow vent 5, second blow vent 9 and third blow vent 6 communicate each other, can adsorb each part of utmost point ear on first mass flow subassembly 8 in proper order through third blow vent 6 and first blow vent 5 to improve the welding effect of utmost point ear.
Preferably, the first current collecting assembly 8 comprises a press-fit disc 3 and a supporting disc 2, the supporting disc 2 is located between the press-fit disc 3 and the winding core 1, a part of a tab extends into the space between the supporting disc 2 and the press-fit disc 3, the supporting disc 2 is connected with the press-fit disc 3 so as to clamp the tab, and the tab is connected with the supporting disc 2 and the press-fit disc 3 simultaneously.
Preferably, be equipped with cavity 7 on the supporting disk 2, third vent 6 locates a lateral wall that is close to utmost point ear on the supporting disk 2, and a lateral wall of keeping away from utmost point ear on the supporting disk 2 is located to first vent 5, and first vent 5 is located the edge of supporting disk 2, and third vent 6 and first vent 5 all communicate with cavity 7, and the passageway of gas circulation and buffering can be regarded as to the 7 structures of cavity, has realized the gas circulation between first vent 5, third vent 6 and the second vent 9.
Preferably, the support plate 2 includes a main body 201 and a guide portion 202, one end of the guide portion 202 is connected to the main body 201, and the other end of the guide portion 202 extends toward the winding core 1; the outer surface of the guide portion 202 gradually shrinks from one end of the guide portion 202 to the other end of the guide portion 202, the guide portion 202 is convex, the convex guide portion 202 can guide the tab to extend upwards, and the bending angle of the tab can be controlled through the guide portion 202, so that the tab is bent at a smaller bending angle, the possibility of tab fracture is reduced, and the attaching effect of the tab and the guide portion 202 is improved.
Preferably, the first collecting assembly 8 further comprises a vent pipe 4, one end of the vent pipe 4 is connected with the supporting plate 2, the vent pipe 4 is communicated with the cavity 7, the other end of the vent pipe 4 is a second vent 9, and after the tabs are flattened, the vent pipe 4 is in contact with other structures of the battery, so that the vent pipe and the supporting plate 2 together provide mechanical support for the press-fit plate 3, and therefore the mechanical structure of the whole battery is more stable, and the cycle life is longer.
Preferably, the number of the third air ports 6 is plural, the plural third air ports 6 are uniformly provided on the guide portion 202, the number of the first air ports is plural, and the plural first air ports 5 are annularly arranged on the body portion 201.
Preferably, the other end of the vent tube 4 is inserted into the center hole 10 of the jelly roll 1, and inserting the vent tube 4 into the center hole 10 enables effective use of the internal space of the battery.
Preferably, the central axis of the vent pipe 4 and the central axis of the support disc 2 are located on the same straight line.
Preferably, the connection of the support disc and the compression disc 3 is by welding.
The specific use of this structure is as follows: when kneading, the third vent 6 inhales to make the tab tightly stick to the guide part 202 of the support disc 2, so that the effective welding point between the tab and the guide part 202 of the support disc 2 is increased, the tab positioned at the innermost circle after welding is completely blocked by the third vent 6, and the tab at the outermost circle is not welded with the main body part 201 of the support disc 2, so that the first vent 5 is not blocked, namely, only the first vent 5 is left.
When the pressing disc 3 is close to the supporting disc 2 until the pressing disc 3 and the supporting disc 2 completely clamp the outermost ring of the lugs, air is blown from the second vent 9, the air escapes from the first vent 5, the outermost ring of the lugs is blown to be tightly attached to the circular pressing disc 3, welding is carried out on the premise that the contact area between the outermost ring of the lugs and the pressing disc 3 is increased, and effective welding points are increased; after the part is welded, air is sucked from the second vent hole, the negative pressure in the supporting disc 2 of the structure is strong, the lug clamped between the supporting disc 2 and the pressing disc 3 can be further close to the supporting disc 2, the welding is carried out under the condition that the effective welding points of the outermost ring of the lug and the supporting disc 2 become more, and the welding of the lug is completed in a mode of firstly sucking air, then blowing air and finally sucking air.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the welding effect of the lug, the supporting disc 2 and the pressing disc 3 is obviously improved by arranging the third vent hole and the first vent hole;
the supporting plate 2 and the pressing plate 3 can effectively prevent the lug kneading plane from warping, and greatly reduce the possibility of warping after the lug kneading plane;
after the structure is installed, the whole mechanical structure of the battery is more stable through the vent pipe 4, the safety performance of the battery is improved, and the cycle life of the battery is prolonged;
the electrode lug can be more smoothly contacted with the second current collecting assembly through the guide part 202, the phenomenon that the electrode lug is broken and falls off is avoided, the electrode lug is tightly contacted with the second current collecting assembly, the contact area is large, and therefore the impedance of the battery is reduced.
Through a set of gas actions of firstly 'sucking' and then 'blowing' and finally 'sucking', the pole lugs are tightly attached to the supporting disc and the pressing disc, effective welding spots are more, and the internal resistance of the battery is small.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A lithium ion battery current collection structure, comprising:
the winding core is provided with tabs at two ends;
the first current collecting assembly is arranged at one end of the winding core;
wherein, first air vent, second air vent and third air vent have on the first mass flow subassembly, the third air vent orientation roll up the core, first air vent deviates from roll up the core, first air vent, second air vent and third air vent communicate each other.
2. The lithium ion battery current collecting structure of claim 1, wherein the first current collecting assembly comprises a pressing disc and a supporting disc, the supporting disc is located between the pressing disc and the winding core, a portion of the tab extends between the supporting disc and the pressing disc, the supporting disc is connected with the pressing disc so as to clamp the tab, and the tab is connected with the supporting disc and the pressing disc simultaneously.
3. The lithium ion battery current collecting structure of claim 2, wherein a cavity is formed on the supporting plate, the third vent is formed on a side wall of the supporting plate close to the tab, the first vent is formed on a side wall of the supporting plate far away from the tab, and both the third vent and the first vent are communicated with the cavity.
4. The lithium ion battery current collecting structure according to claim 2, wherein the support disc comprises a main body part and a guiding part, one end of the guiding part is connected with the main body part, and the other end of the guiding part extends towards the winding core;
the outer surface of the guide portion gradually shrinks from one end of the guide portion to the other end of the guide portion.
5. The lithium ion battery current collecting structure according to claim 3, wherein the first current collecting assembly further comprises a vent pipe, one end of the vent pipe is connected to the support plate, the vent pipe is communicated with the cavity, and the other end of the vent pipe is a second vent hole.
6. The lithium ion battery current collecting structure according to claim 4, wherein the number of the third air vents is multiple, and the multiple third air vents are uniformly arranged on the guide part;
the number of the first air vents is multiple, and the multiple first air vents are annularly arranged on the main body part.
7. The lithium ion battery current collecting structure of claim 5, wherein the other end of the vent pipe extends into the central hole of the winding core.
8. The lithium ion battery current collecting structure of claim 5, wherein the central axis of the vent pipe and the central axis of the support plate are located on the same straight line.
9. The lithium ion battery current collecting structure according to claim 1, wherein the connection manner of the supporting disk and the pressing disk is welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210595275.9A CN115051119B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210595275.9A CN115051119B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
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| Publication Number | Publication Date |
|---|---|
| CN115051119A true CN115051119A (en) | 2022-09-13 |
| CN115051119B CN115051119B (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210595275.9A Active CN115051119B (en) | 2022-05-28 | 2022-05-28 | Lithium ion battery current collection structure |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090305123A1 (en) * | 2007-11-05 | 2009-12-10 | Naoyuki Wada | Secondary battery and method for producing the same |
| CN108987790A (en) * | 2018-08-31 | 2018-12-11 | 成都市银隆新能源产业技术研究有限公司 | A kind of lithium battery |
| CN209804722U (en) * | 2019-04-30 | 2019-12-17 | 济南圣泉集团股份有限公司 | Lithium ion battery |
| JP2020092016A (en) * | 2018-12-06 | 2020-06-11 | 株式会社豊田自動織機 | Manufacturing device of power storage device |
| CN213401445U (en) * | 2020-11-26 | 2021-06-08 | 江西远东电池有限公司 | Novel full utmost point ear structure cylinder battery |
| CN113422140A (en) * | 2021-06-17 | 2021-09-21 | 合肥国轩高科动力能源有限公司 | Lithium ion cylindrical battery |
| CN113809443A (en) * | 2021-08-24 | 2021-12-17 | 贵阳比耐新能源科技有限公司 | Cylindrical aluminum shell battery and manufacturing method thereof |
| CN114361466A (en) * | 2022-01-12 | 2022-04-15 | 江苏正力新能电池技术有限公司 | Cylindrical battery and energy storage device |
-
2022
- 2022-05-28 CN CN202210595275.9A patent/CN115051119B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090305123A1 (en) * | 2007-11-05 | 2009-12-10 | Naoyuki Wada | Secondary battery and method for producing the same |
| CN108987790A (en) * | 2018-08-31 | 2018-12-11 | 成都市银隆新能源产业技术研究有限公司 | A kind of lithium battery |
| JP2020092016A (en) * | 2018-12-06 | 2020-06-11 | 株式会社豊田自動織機 | Manufacturing device of power storage device |
| CN209804722U (en) * | 2019-04-30 | 2019-12-17 | 济南圣泉集团股份有限公司 | Lithium ion battery |
| CN213401445U (en) * | 2020-11-26 | 2021-06-08 | 江西远东电池有限公司 | Novel full utmost point ear structure cylinder battery |
| CN113422140A (en) * | 2021-06-17 | 2021-09-21 | 合肥国轩高科动力能源有限公司 | Lithium ion cylindrical battery |
| CN113809443A (en) * | 2021-08-24 | 2021-12-17 | 贵阳比耐新能源科技有限公司 | Cylindrical aluminum shell battery and manufacturing method thereof |
| CN114361466A (en) * | 2022-01-12 | 2022-04-15 | 江苏正力新能电池技术有限公司 | Cylindrical battery and energy storage device |
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| CN115051119B (en) | 2023-03-28 |
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Address after: No. 1, Chuneng Avenue, Lingang Economic Zone, Xiaogan City, Hubei Province, 430051 Patentee after: Chuneng new energy Co.,Ltd. Address before: 430051 No. 1, Longyang Third Road, Hanyang District, Wuhan City, Hubei Province Patentee before: Chuneng new energy Co.,Ltd. |