CN212783701U - Tab connection structure, battery unit and battery module - Google Patents
Tab connection structure, battery unit and battery module Download PDFInfo
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- CN212783701U CN212783701U CN202021957566.0U CN202021957566U CN212783701U CN 212783701 U CN212783701 U CN 212783701U CN 202021957566 U CN202021957566 U CN 202021957566U CN 212783701 U CN212783701 U CN 212783701U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model relates to the technical field of batteries, specifically provide a utmost point ear connection structure, battery cell and battery module. The tab connecting structure comprises a metal tab bundle, a metal foil and a second metal tab; the metal tab bundle comprises at least two superposed first metal tabs, the first metal tabs are made of metal lithium, and two sides of the metal tab bundle along the superposition direction are respectively provided with a connecting surface; the metal foil is connected with the two connecting surfaces in a pressing way; the second metal tab is connected with the metal foil in a welding mode through a connecting end, so that the metal tab bundle, the metal foil and the second metal tab are connected in a welding mode. The utility model discloses can make the relation of connection of utmost point ear bundle and second metal utmost point ear more firm, avoid the utmost point ear to restraint and second metal utmost point ear lug direct weld, utilize the metal foil material to restraint to provide the protection efficiency to the utmost point ear for this utmost point ear connection structure is difficult for producing and peels off, thereby avoids contact failure, guarantees the electric conductive property of utmost point ear structure.
Description
Technical Field
The utility model relates to the technical field of batteries, especially, relate to a utmost point ear connection structure, battery cell and battery module.
Background
In the current battery technology field, the existing lithium battery (for example, lithium sulfur battery) usually uses a lithium electrode tab as a negative electrode tab, and uses a nickel electrode tab to connect to the lithium electrode tab.
However, because lithium metal (Li) has the characteristics of low hardness and high viscosity, in the prior art, a pressing method is adopted, the surface of the nickel electrode lug is firstly roughened, and then the lithium metal and the nickel metal (Ni) are pressed together in a cold pressing manner. However, in the process of high rate and long-term cycling, the nickel tab and the lithium tab are stripped to cause poor contact, which affects the conductivity of the tab structure.
SUMMERY OF THE UTILITY MODEL
The present invention has a main object to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide a tab connection structure with a firm connection.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
according to one aspect of the present invention, a tab connection structure is provided; the tab connecting structure comprises a metal tab bundle, a metal foil and a second metal tab; the metal tab bundle comprises at least two superposed first metal tabs, the first metal tabs are made of metal lithium, and two sides of the metal tab bundle along the superposition direction are respectively provided with a connecting surface; the metal foil is connected to the two connecting surfaces in a pressing mode; and the second metal lug is connected with the metal foil in a welding way through a connecting end, so that the metal lug bundle, the metal foil and the second metal lug are connected in a welding way.
According to the above technical scheme, the utility model provides an utmost point ear connection structure's advantage lies in with positive effect:
the utility model provides a utmost point ear connection structure connects the metal foil material at two connection surface pressfittings that the metal utmost point ear restrainted to with second metal utmost point ear welded connection in metal foil material. Through the structure design, the utility model discloses can make the relation of connection of utmost point ear bundle and second utmost point ear more firm, avoid utmost point ear to restraint and second utmost point ear direct weld to can utilize the metal foil material to restraint to provide the protection efficiency to utmost point ear, make this utmost point ear connection structure be difficult for producing and peel off, thereby avoid contact failure, guarantee the electric conductive property of utmost point ear structure.
Another primary object of the present invention is to overcome at least one of the above-mentioned drawbacks of the prior art and to provide a battery unit having the above-mentioned tab connection structure.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
according to an aspect of the present invention, there is provided a battery unit; wherein, battery unit contains the utility model provides a utmost point ear connection structure.
According to the above technical scheme, the utility model provides a battery unit's advantage lies in with positive effect:
the utility model provides a battery unit, through adopting the utility model provides a utmost point ear connection structure for the metal utmost point ear is restrainted more firmly with second metal utmost point ear's relation of connection, is difficult for producing and peels off, thereby avoids contact failure, guarantees the electric conductive property of utmost point ear structure.
Another main object of the present invention is to overcome at least one of the above-mentioned drawbacks of the prior art, and to provide a battery module with a tab structure connected firmly.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
according to one aspect of the present invention, a battery module is provided; wherein, the battery module contains the utility model provides a utmost point ear connection structure
According to the above technical scheme, the utility model provides a battery module's advantage lies in with positive effect:
the utility model provides a battery module is through adopting the utility model provides an utmost point ear connection structure for the metal utmost point ear is restrainted more firmly with second metal utmost point ear's relation of connection, is difficult for producing and peels off, thereby avoids contact failure, guarantees the electric conductive property of utmost point ear structure.
Drawings
The various objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the invention, when considered in conjunction with the accompanying drawings. The drawings are merely exemplary of the invention and are not necessarily drawn to scale. In the drawings, like reference characters designate the same or similar parts throughout the different views. Wherein:
fig. 1 is a schematic view illustrating a tab connection structure according to an exemplary embodiment;
fig. 2 is a partial structural view of a battery cell having the tab connection structure shown in fig. 1.
The reference numerals are explained below:
100. a tab connection structure;
110. a metal tab bundle;
120. a metal foil;
130. a second metal tab;
131. a connecting end;
140. a heat sealing structure;
210. a positive electrode tab bundle;
220. aluminum tabs;
230. a heat sealing structure;
310. a positive plate;
320. a negative plate;
l1, length;
l2, length;
l3, length;
D1. a width;
D2. a width;
x. a first direction;
y. a second direction.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.
In the following description of various exemplary embodiments of the invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary structures, systems, and steps in which aspects of the invention may be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps may be utilized, and structural and functional modifications may be made without departing from the scope of the present invention. Moreover, although the terms "over," "between," "within," and the like may be used in this specification to describe various example features and elements of the invention, these terms are used herein for convenience only, e.g., in accordance with the orientation of the examples described in the figures. Nothing in this specification should be construed as requiring a specific three dimensional orientation of structures to fall within the scope of the invention.
Referring to fig. 1, a schematic structural view of a tab connection structure according to the present invention is representatively shown. In this exemplary embodiment, the tab connection structure proposed by the present invention is described by way of example as applied to a lithium sulfur battery. It will be readily understood by those skilled in the art that various modifications, additions, substitutions, deletions, or other changes may be made to the specific embodiments described below in order to apply the inventive concepts described herein to other types of lithium batteries or other battery devices, and such changes are within the scope of the principles of the tab connection structure as set forth herein.
As shown in fig. 1, in the present embodiment, a tab connection structure 100 according to the present invention includes a metal tab bundle 110, a metal foil 120, and a second metal tab 130. Referring to fig. 2, a schematic diagram of a portion of a battery cell having a tab connection structure 100 embodying the principles of the present invention is representatively illustrated in fig. 2. The structure, connection manner and functional relationship of the main components of the tab connection structure 100 according to the present invention will be described in detail below with reference to the above drawings.
As shown in fig. 1 and 2, in the present embodiment, the metal tab bundle 110 includes at least two first metal tabs stacked, and the stacking direction of the at least two first metal tabs may be understood as a direction perpendicular to the paper surface in the drawings. The metal tab bundle 110 has the connection surfaces on both sides in the above-described stacking direction, respectively, wherein one of the two connection surfaces is represented by a surface of a paper surface in the drawing, and the back of the paper surface can be understood as the other of the two connection surfaces. The metal foil 120 is press-fit connected to both connecting surfaces. The second metal tab 130 extends along the first direction X, the second metal tab 130 has a connection end in the first direction X, and the second metal tab 130 is connected to the outer surface of the metal foil 120, which is opposite to the connection surface, by welding, so that the metal tab bundle 110, the metal foil 120 and the second metal tab 130 are connected by welding. Through the structure design, the utility model discloses can make the relation of connection of utmost point ear bundle and second utmost point ear more firm, avoid utmost point ear to restraint and second utmost point ear direct weld to can utilize the metal foil material to restraint to provide the protection efficiency to utmost point ear, make this utmost point ear connection structure be difficult for producing and peel off, thereby avoid contact failure, guarantee the electric conductive property of utmost point ear structure.
Alternatively, as shown in fig. 1, in the present embodiment, the length L1 of the metal tab bundle 110 in the first direction X may be smaller than the length L2 of the metal foil 120 in the first direction X.
Further, as shown in fig. 1, based on the structural design that the length L1 of the metal tab 110 is less than the length L2 of the metal foil 120, in the present embodiment, the metal foil 120 may have a first section corresponding to the connection surface and a second section exceeding the connection surface in the first direction X. On this basis, the connection end 131 of the second metal tab 130 may be welded to at least a portion of the first segment adjacent to the second segment and at least a portion of the second segment at the same time. Through the above structural design, the second metal tab 130 can increase the welding contact area between the second metal tab 130 and the metal foil 120 when being welded and connected to the metal foil 120 through the connecting end 131, so that the second metal tab 130 is more firmly connected, and the conductive performance of the tab structure is ensured. In other embodiments, the length L1 of the metal tab bundle 110 in the first direction X may also be equal to the length L2 of the metal foil 120 in the first direction X, which is not limited to the present embodiment.
Further, as shown in fig. 1, based on the structural design that the length L1 of the tab bundle 110 is smaller than the length L2 of the foil 120, in the present embodiment, the ratio of the length L2 of the foil 120 in the first direction X to the length L1 of the tab bundle 110 in the first direction X may be 2:1 to 3:1, for example, 2:1, 5:2, 7:3, 3:1, etc. In other embodiments, the ratio of the length L2 of the metal foil 120 to the length L1 of the metal tab bundle 110 may be less than 2:1, or may be greater than 3:1, such as 3:2, 7:2, etc., without being limited to this embodiment.
Alternatively, as shown in fig. 1, in the present embodiment, the lengths of the portions of the metal tab bundle 110, the metal foil 120 and the second metal tab 130 welded together may be 1mm to 5mm in the first direction X, and less than or equal to the length of L3, such as 1mm, 2mm, 3mm, 5mm, etc. The length of the welding part is short, the area of a through hole formed by welding is reduced, and the internal resistance is effectively reduced. In other embodiments, the length of the portion of the metal tab bundle 110, the metal foil 120 and the second metal tab 130 welded together in the first direction X may also be less than 1mm, or may be greater than 5mm, for example, 0.9mm, 5.5mm, and the like, and is not limited in this embodiment.
Alternatively, as shown in fig. 1, in the present embodiment, the width D2 of the metal foil 120 in the second direction Y may be greater than the width D1 of the metal tab bundle 110 in the second direction Y, wherein the second direction Y is perpendicular to the first direction X. Through the above structural design, the metal foil 120 can completely cover the two connection surfaces of the metal tab bundle 110, and can respectively extend out of two sides of the metal tab bundle 110 along the second direction Y. On this basis, the portions of the metal foils 120 located at the two connecting surfaces, which respectively protrude from both sides of the metal tab bundle 110, can be connected, thereby further optimizing the firmness of the tab connecting structure 100.
Alternatively, in the present embodiment, the metal foil 120 may be an integral structure, and on this basis, the metal foil 120 in the integral structure may be disposed on two connecting surfaces of the metal tab bundle 110 in a bending manner. Through the above structural design, the process of arranging the metal foil 120 on the metal tab bundle 110 is simpler and more convenient. In addition, when the metal foils 120 extend out of a portion of the two sides of the metal tab bundle 110, since the metal foils 120 disposed on the two connecting surfaces are integrated, when the portions of the metal foils 120 disposed on the two connecting surfaces, which extend out of the two sides of the metal tab bundle 110, are welded, only the metal foil 120 on one side needs to be welded, and the metal foil 120 on the other side, which is integrated, is bent, so that the process is further simplified.
Alternatively, in the present embodiment, the metal foil 120 may have affinity with respect to the metal material of the first metal tab. For example, the affinity of the metal foil 120 for the metal material of the first metal tab may be higher than the affinity of the second metal tab 130 for the metal material of the first metal tab. In view of the above, compare in current design, the utility model discloses a metal utmost point ear bundle 110 is more firm with second metal utmost point ear 130's relation of connection, is difficult for producing to peel off to avoid contact failure, guarantee the electric conductive property of utmost point ear structure.
Alternatively, in the present embodiment, the tab connection structure 100 provided in the present invention is described by taking an example of a negative electrode provided in a battery cell, and on this basis, the material of the first metal tab 110 may include metallic lithium, the material of the second metal tab 130 includes metallic nickel, and the material of the metal foil 120 includes metallic copper (Cu). In other embodiments, when the first metal tab 110 is a lithium tab and the second metal tab 130 is a nickel tab, the metal foil 120 may also be made of other metal materials, and the metal material affinity of the metal foil 120 with respect to the metal lithium is higher than the metal material affinity of the metal nickel with respect to the metal lithium.
Alternatively, in the present embodiment, the metal foil 120 may be coated on both connecting surfaces of the metal tab bundle 110 by a cold pressing and pressing method. Specifically, the metal tab bundle 110 may be first wrapped with the metal foil 120, and then cold-pressed by an ultrasonic welding machine (i.e., cold-pressed by directly dropping a welding head without ultrasonic welding), so as to prevent the metal material of the metal tab bundle 110 from sticking to the welding head. In addition, the metal foil 120 is used for coating the metal tab bundle 110, so that passing current can be shunted, and heating caused by excessive concentration of overcurrent is avoided.
Alternatively, in the present embodiment, the welding connection between the metal tab bundle 110 and the metal foil 120 may be achieved by ultrasonic welding. Therefore, the welding tension of the second metal tab 130 and the metal tab bundle 110 can be enhanced, the metal tab bundle 110 can be prevented from falling off, and meanwhile, because only a small part of the metal tab bundle 110 is overlapped with the second metal tab 130 (for example, 1 mm-5 mm in the embodiment), the phenomena of overcurrent and overheating at the tab position caused by excessive welding of the lithium tab can be avoided.
It should be noted herein that the tab connection structures shown in the drawings and described in the present specification are only a few examples of the many kinds of tab connection structures to which the principles of the present invention can be applied. It should be clearly understood that the principles of the present invention are in no way limited to any details of the tab connection structure or any component of the tab connection structure shown in the drawings or described in the specification.
To sum up, the utility model provides a utmost point ear connection structure connects the metal foil at two connection surface pressfitting of metal utmost point ear bundle to with second metal utmost point ear welded connection in metal foil. Through the structure design, the utility model discloses can make the relation of connection of utmost point ear bundle and second utmost point ear more firm, avoid utmost point ear to restraint and second utmost point ear direct weld to can utilize the metal foil material to restraint to provide the protection efficiency to utmost point ear, make this utmost point ear connection structure be difficult for producing and peel off, thereby avoid contact failure, guarantee the electric conductive property of utmost point ear structure.
Based on the above detailed description of an exemplary embodiment of the tab connection structure according to the present invention, an exemplary embodiment of a battery unit according to the present invention will be described below with reference to fig. 1.
As shown in fig. 1, in the present embodiment, the battery unit provided by the present invention includes the tab connection structure 100 provided by the present invention and described in detail in the above embodiments. Through the structure design, the utility model provides a battery unit's utmost point ear connection structure 100's relation of connection is more firm, and difficult production is peeled off to avoid contact failure, guarantee the electric conductive property of utmost point ear structure.
Specifically, as shown in fig. 2, in the present embodiment, a positive tab structure is connected to the positive electrode sheets 310 of the battery cells, and the positive tab structure may include a positive tab bundle 210 and an aluminum tab 220 connected to the positive tab bundle 210. Further, the negative electrode tab structure, i.e., the tab connection structure 100, is connected to the negative electrode tab 320 of the battery cell. Wherein, the metal tab bundle 110 of the tab connection structure 100 is connected to the negative electrode tab 320. In other embodiments, the battery unit may also adopt other positive electrode tab structures. Furthermore, when the positive electrode tab structure of the battery unit includes the positive electrode tab bundle 210, the positive electrode tab bundle 210 may be connected with a metal tab made of other metal materials instead of the aluminum tab 220, which is not limited by the present embodiment.
Note that, as shown in fig. 2, the positive electrode tab 310 and the negative electrode tab 320 of the battery cell in fig. 2 are shown in a separated state for easy understanding and illustration. In a practical structure of the battery cell, at least two positive electrode sheets 310 may be alternately stacked with at least two negative electrode sheets 320, and the stacking direction of the positive electrode sheets 310 and the negative electrode sheets 320 is the same as the stacking direction of the above-described at least two first metal tabs, i.e., the direction perpendicular to the paper plane.
Alternatively, referring to fig. 2, in the present embodiment, the second metal tab 130 has a heat sealing structure 140 thereon, and correspondingly, the aluminum tab 220 of the positive electrode tab structure has a heat sealing structure 230 thereon. On the basis, the heat-sealing structure 140 on the second metal tab 130 and the heat-sealing structure 230 on the aluminum tab 220 can be located at the same horizontal plane, so as to facilitate the assembly of the battery cells, and accordingly, the assembled battery cells have smaller internal resistance and better cycle stability.
It should be noted herein that the battery cells illustrated in the drawings and described in the present specification are but a few examples of the many types of battery cells that the principles of the present invention can be employed in. It should be clearly understood that the principles of the present invention are by no means limited to any details of the battery cell or any components of the battery cell as shown in the drawings or described in the specification.
To sum up, the utility model provides a battery unit is through adopting the utility model provides a utmost point ear connection structure for the metal utmost point ear is restrainted more firmly with second metal utmost point ear's relation of connection, is difficult for producing and peels off, thereby avoids contact failure, guarantees the electric conductive property of utmost point ear structure.
Based on the above detailed description of an exemplary embodiment of the tab connection structure and the battery unit according to the present invention, an exemplary embodiment of the battery module according to the present invention will be described below.
In this embodiment, the battery module according to the present invention includes the tab connection structure according to the present invention and described in detail in the above embodiments. Through the structure design, the utility model provides a battery unit's utmost point ear connection structure's relation of connection is more firm, is difficult for producing and peels off to avoid contact failure, guarantee the electric conductive property of utmost point ear structure, the internal resistance of the battery module of equipment in view of the above is less, the cycling stability preferred.
It should be noted herein that the battery modules shown in the drawings and described in the present specification are only a few examples of the many kinds of battery modules that can employ the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any details of the battery module or any components of the battery module shown in the drawings or described in the specification.
To sum up, the utility model provides a battery module is through adopting the utility model provides a utmost point ear connection structure for the metal utmost point ear is restrainted more firmly with second metal utmost point ear's relation of connection, is difficult for producing and peels off, thereby avoids contact failure, guarantees the electric conductive property of utmost point ear structure.
Exemplary embodiments of a tab connection structure, a battery cell, and a battery module according to the present invention are described and/or illustrated in detail above. Embodiments of the invention are not limited to the specific embodiments described herein, but rather, components and/or steps of each embodiment may be utilized independently and separately from other components and/or steps described herein. Each component and/or step of one embodiment can also be used in combination with other components and/or steps of other embodiments. When introducing elements/components/etc. described and/or illustrated herein, the articles "a," "an," and "the" are intended to mean that there are one or more of the elements/components/etc. The terms "comprising," "including," and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc. Furthermore, the terms "first" and "second" and the like in the claims and the description are used merely as labels, and are not numerical limitations of their objects.
While the tab connection structure, battery cell and battery module as set forth in the present invention have been described in terms of various specific embodiments, those skilled in the art will recognize that the practice of the invention can be practiced with modification within the spirit and scope of the claims.
Claims (10)
1. A tab connection structure, comprising:
the metal tab bundle comprises at least two superposed first metal tabs, the first metal tabs are made of metal lithium, and two sides of the metal tab bundle along the superposition direction are respectively provided with a connecting surface;
the metal foil is connected to the two connecting surfaces in a pressing mode; and
and the second metal lug is connected with the metal foil in a welding way through a connecting end so that the metal lug bundle, the metal foil and the second metal lug are connected in a welding way.
2. The tab connection structure as claimed in claim 1, wherein the length of the bundle of metal tabs in the first direction is smaller than the length of the metal foil in the first direction.
3. The tab connection structure as claimed in claim 2, wherein the metal foil has a first section corresponding to the connection surface and a second section extending beyond the connection surface in a first direction, and the connection end is welded to at least a portion of the first section adjacent to the second section and at least a portion of the second section.
4. The tab connection structure according to claim 1, wherein the length of the portion of the bundle of metal tabs, the portion of the metal foil, and the second metal tab, which are welded together, in the first direction is 1mm to 5 mm.
5. The tab connection structure as claimed in claim 1, wherein the length of the bundle of metal tabs in a first direction is equal to the length of the metal foil in the first direction; and/or the width of the metal foil in the second direction is larger than the width of the metal tab bundle in the second direction, and the second direction is perpendicular to the first direction.
6. The tab connection structure as claimed in claim 1, wherein the metal foil is a unitary structure and is provided to the two connection surfaces of the bundle of metal tabs by bending.
7. The tab connection structure as claimed in claim 1, wherein the metal foil has an affinity with respect to a metal material of the first metal tab.
8. The tab connection structure according to claim 1, wherein the material of the second metal tab comprises metallic nickel; and/or the material of the metal foil comprises metal copper.
9. A battery cell characterized by comprising the tab connection structure according to any one of claims 1 to 8.
10. A battery module comprising the tab connection structure according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021957566.0U CN212783701U (en) | 2020-09-09 | 2020-09-09 | Tab connection structure, battery unit and battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021957566.0U CN212783701U (en) | 2020-09-09 | 2020-09-09 | Tab connection structure, battery unit and battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212783701U true CN212783701U (en) | 2021-03-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021957566.0U Active CN212783701U (en) | 2020-09-09 | 2020-09-09 | Tab connection structure, battery unit and battery module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212783701U (en) |
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2020
- 2020-09-09 CN CN202021957566.0U patent/CN212783701U/en active Active
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Address after: 166 Kejiao Road, Jintan District, Changzhou City, Jiangsu Province Patentee after: Kaibo Energy Technology Co.,Ltd. Address before: 166 Kejiao Road, Jintan District, Changzhou City, Jiangsu Province Patentee before: CHINA AVIATION LITHIUM BATTERY RESEARCH INSTITUTE 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: 166 Kejiao Road, Jintan District, Changzhou City, Jiangsu Province Patentee after: AVIC Innovation Technology Research Institute (Jiangsu) Co.,Ltd. Address before: 166 Kejiao Road, Jintan District, Changzhou City, Jiangsu Province Patentee before: Kaibo Energy Technology Co.,Ltd. |