CN108428814A - Packaging film and soft-package battery - Google Patents
Packaging film and soft-package battery Download PDFInfo
- Publication number
- CN108428814A CN108428814A CN201710080426.6A CN201710080426A CN108428814A CN 108428814 A CN108428814 A CN 108428814A CN 201710080426 A CN201710080426 A CN 201710080426A CN 108428814 A CN108428814 A CN 108428814A
- Authority
- CN
- China
- Prior art keywords
- layer
- packaging film
- face
- outer end
- soft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012785 packaging film Substances 0.000 title claims abstract description 68
- 229920006280 packaging film Polymers 0.000 title claims abstract description 68
- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 238000005538 encapsulation Methods 0.000 claims description 27
- 239000004677 Nylon Substances 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000005030 aluminium foil Substances 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 229920001778 nylon Polymers 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 239000000463 material Substances 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007688 edging Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 239000002390 adhesive tape Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/116—Primary casings; Jackets or wrappings characterised by the material
- H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention provides a kind of packaging film and soft-package batteries.Packaging film includes external protection, interior fused layer and the metal layer between external protection and interior fused layer.Wherein, at least one outer end face of the interior fused layer in edge exceeds the correspondence outer end face of metal layer.Soft-package battery includes：Battery core；And upper layer and lower layer packaging film, two layers of packaging film surround the inner cavity of receiving battery core at middle part, are connected in inner cavity peripheral sealing.Wherein, on each layer packaging film, the part of correspondence outer end face of the interior fused layer beyond metal layer is folded back on external protection, to coat the correspondence outer end face of metal layer.On each layer packaging film, the part of correspondence outer end face of the interior fused layer beyond metal layer can coat the correspondence outer end face of metal layer by inflection, thus by metal layer insulated enclosure, therefore, the soft-package battery of the present invention can realize the insulated enclosure of the outer end face using the structure of itself, without using other edging materials edge sealing effect is improved to simplify the edge sealing process of soft-package battery.
Description
Technical field
The present invention relates to field of batteries more particularly to a kind of packaging films and soft-package battery.
Background technology
Soft bag lithium ionic cell mainly uses aluminum-plastic composite membrane to carry out battery core encapsulation at present, and aluminum plastic film is broadly divided into protection
Layer, metal layer and fused layer three-decker.After encapsulated when packaging, trimming, the metal layer in the edge on encapsulation side can not be by
Package and exposed, the problems such as being easy to cause short circuit.
Current battery edge edge sealing structure mainly has two kinds of structures of encapsulated single folded edges and double-fold.Encapsulated list flanging knot
Structure is to stick insulating tape at the edge on cell package side, then uses mechanical means that will encapsulate side and turns up and be pasted onto battery core master
Body side；Double-fold structure is then that will encapsulate when the edge for exposing metal layer is folded to encapsulation on ontology, then will encapsulate side sheet
Battery core main body is turned up and be adhered to body, so that the edge of exposing metal layer is clamped in encapsulation side ontology and battery core master by turning down twice
Between body.
Two kinds of edge sealing structures can solve the problems, such as the dew aluminium of current conventional batteries, but there is also itself larger limitations
Property, especially when edge sealing processing is made on the non-rectilinear side to non-rectangular batteries, limitation is more obvious, on the one hand, for non-rectilinear
Side, insulating tape can not completely coat the edge on encapsulation side, there is dew aluminium risk, for arc-shaped sides such as fillets, there are adhesive tapes
The problems such as corrugation, overlapping, cause open defect, and after a certain period of use time, adhesive tape may be stuck up in section start and termination
It rises or turns over angle, cause open defect and dew aluminium risk；On the other hand, it for encapsulated single folded edges, needs to increase the consumptions such as adhesive tape
Material, while needing to increase rubberizing process；For double-fold structure, flanging tedious process twice, while the width of battery is increased,
It is easy to cause dimension ultra-specification.
Invention content
The problem of in view of background technology, the purpose of the present invention is to provide a kind of packaging film and soft-package battery,
The edge sealing process that soft-package battery can be simplified, improves edge sealing effect.
To achieve the goals above, in a first aspect, the present invention provides a kind of packaging films comprising external protection, interior
Fused layer and the metal layer between external protection and interior fused layer.Wherein, interior fused layer is in at least one of edge
Outer end face exceeds the correspondence outer end face of metal layer.
To achieve the goals above, in second aspect, the present invention provides a kind of soft-package batteries comprising：Battery core；Up and down
Packaging film described in two layers of first aspect present invention, two layers of packaging film surrounds the inner cavity of receiving battery core at middle part, on inner cavity periphery
It is tightly connected.Wherein, on each layer packaging film, the part of correspondence outer end face of the interior fused layer beyond metal layer is folded back to outer protection
On layer, to coat the correspondence outer end face of metal layer.
Beneficial effects of the present invention are as follows：
In packaging film according to the present invention and soft-package battery, on each layer packaging film, interior fused layer exceeds metal layer
The part of corresponding outer end face can coat the correspondence outer end face of metal layer by inflection, thus by metal layer insulated enclosure, therefore,
The soft-package battery of the present invention can realize the insulated enclosure of the outer end face using the structure of itself, without using other edge sealing materials
Material improves edge sealing effect to simplify the edge sealing process of soft-package battery.
Description of the drawings
Fig. 1 is the schematic diagram according to the packaging film of the present invention；
Fig. 2 is another schematic diagram according to the packaging film of the present invention；
Fig. 3 is the schematic diagram gone out according to the packaging film of the present invention after pit；
Fig. 4 is the schematic diagram according to the soft-package battery of the present invention；
Fig. 5 is the sectional view that A-A makes along Fig. 4；
Fig. 6 is the schematic diagram in the soft-package battery forming process according to the present invention；
Fig. 7 is another schematic diagram in the soft-package battery forming process according to the present invention；
Fig. 8 is another schematic diagram according to the soft-package battery of the present invention.
Wherein, the reference numerals are as follows：
1 packaging film B battery cores
11 external protection B1 lugs
111 inner cavities outer end face M
Fused layer M1 side walls in 12
121 outer end face G glue
13 metal layer W width directions
131 outer end face L length directions
S encapsulates side
Specific implementation mode
Carry out the packaging film and soft-package battery that the present invention will be described in detail with reference to the accompanying drawings
Illustrate packaging film according to a first aspect of the present invention first.
Referring to figs. 1 to Fig. 8, packaging film 1 according to the present invention is including external protection 11, interior fused layer 12 and is located at outer guarantor
Metal layer 13 between sheath 11 and interior fused layer 12.Wherein, at least one outer end face of the interior fused layer 12 in edge 121 surpasses
Go out the correspondence outer end face 131 of metal layer 13.
In packaging film 1 according to the present invention, at least one outer end face 121 due to interior fused layer 12 in edge exceeds
The correspondence outer end face 131 of metal layer 13, then the part of correspondence outer end face 131 of the interior fused layer 12 beyond metal layer 13 can
Metal layer 13 is coated with inflection, avoids the outer end face 131 of the metal layer 13 exposed, prevents the soft-package battery using this packaging film 1
Short circuit.
In packaging film 1 according to the present invention, interior fused layer 12 is polypropylene, and external protection 11 is nylon, metal layer 13
For aluminium foil or steel foil.
In packaging film 1 according to the present invention, referring to Fig.1, Fig. 2, Fig. 5 to Fig. 8, the outer end face 111 of external protection 11 with
The outer end face 131 of corresponding metal layer 13 flushes.
In packaging film 1 according to the present invention, referring to Fig.1, Fig. 5 to Fig. 8, two of the W in the width direction of interior fused layer 12
Outer end face 121 exceeds the correspondence outer end face 131 of metal layer 13 respectively.
In packaging film 1 according to the present invention, with reference to Fig. 2, the outer end face 121 of 12 surrounding of interior fused layer exceeds metal layer
13 correspondence outer end face 131.
Secondly the soft-package battery of explanation according to a second aspect of the present invention.
Referring to figs. 1 to Fig. 8, soft-package battery according to the present invention includes：Battery core B；And upper layer and lower layer first party of the present invention
Packaging film 1 described in face, two layers of packaging film 1 surround the inner cavity M of receiving battery core B at middle part, are connected in inner cavity M peripheral sealings.Its
In, on each layer packaging film 1, the part of correspondence outer end face 131 of the interior fused layer 12 beyond metal layer 13 is folded back to external protection
On 11, to coat the correspondence outer end face 131 of metal layer 13.
In soft-package battery according to the present invention, on each layer packaging film 1, interior fused layer 12 exceeds the correspondence of metal layer 13
The part of outer end face 131 can coat the correspondence outer end face 131 of metal layer 13 by inflection, close to which metal layer 13 insulate
Envelope, therefore, soft-package battery of the invention can realize the insulated enclosure of the outer end face 131 using the structure of itself, without using
Other edging materials (such as insulating tape) carry to simplify the edge sealing process (without rubberizing equipment and process) of soft-package battery
High edge sealing effect.
Meanwhile for non-rectangle soft-package battery, it can also realize that edge sealing (insulate metal layer 13 in this way
Sealing).For example, for there is the soft-package battery of arc-shaped side, since this mode is not necessarily to insulating tape, so as to avoid using exhausted
The problems such as corrugation caused by edge adhesive tape, overlapping.
In soft-package battery according to the present invention, with reference to Fig. 5 and Fig. 8, interior fused layer 12 is folded back on external protection 11
Part is bonded together with external protection 11 by glue.
In soft-package battery according to the present invention, with reference to Fig. 4 to Fig. 8, sealing of two layers of packaging film 1 on the inner cavity peripheries M connects
The place of connecing forms multiple encapsulation side S, on encapsulation side S, the interior fused layer 12 (passing through hot pressing) of two layers of 1 direct opposite segments of packaging film
It is merged.
In soft-package battery according to the present invention, with reference to Fig. 8, in the multiple encapsulation side S, two of which encapsulates side S
Positioned at the both sides of inner cavity M W in the width direction, and described two encapsulation side S bend and are adhered on the side wall M1 of inner cavity M.Pass through
Described two encapsulation side S are bent, the overall width of soft-package battery can be reduced, improve the energy density of soft-package battery.At this point, excellent
Two outer end faces 121 of the interior fused layer 12 of two layers of packaging film 1 W in the width direction are selected to exceed the correspondence outer end of metal layer 13 respectively
Face 131, therefore, described two encapsulation side S, which are not necessarily to other edging materials, can realize edge sealing.
In soft-package battery according to the present invention, it can be determined according to the quantity and position that need edge sealing in soft-package battery each
(which outer end face 121 of interior fused layer 12 needs outside the correspondence beyond metal layer 13 shape of packaging film 1 in i.e. each packaging film 1
End face 131).
In soft-package battery according to the present invention, with reference to Fig. 4, in the multiple encapsulation side S, one of encapsulation side S
Positioned at the side of inner cavity M L along its length, and the lug B1 of battery core B is stretched out from one encapsulation side S.
In an embodiment of soft-package battery according to the present invention, the upper layer and lower layer packaging film 1 is independent Liang Zhangbao
Fill film.Wherein, pit is stamped out on a packaging film, another packaging film is with a packaging film in connection sealed around
(forming four encapsulation side S), to be sealed pit and (form inner cavity M).
In another embodiment of soft-package battery according to the present invention, with reference to Fig. 3, the upper layer and lower layer packaging film 1 is by one
Packaging film doubling is opened to form.Stamp out pit on a packaging film, then the doubling packaging film by pit to seal (shape
At inner cavity M), it is formed simultaneously connected two layers of packaging film 1, two layers of packaging film 1 connects in edge seal and form three encapsulation sides
S。
In soft-package battery according to the present invention, with reference to Fig. 5 to Fig. 8, pit, lower layer's packet are gone out on upper layer packaging film 1
Dress film 1 is closed pit to form the inner cavity M of receiving battery core B.
In soft-package battery according to the present invention, described two encapsulation side S (are located at the both sides of W in the width direction inner cavity M
Encapsulation side S) it is bonded on the side wall M1 of inner cavity M by glue G.
In soft-package battery according to the present invention, described two encapsulation side S (are located at the both sides of W in the width direction inner cavity M
Encapsulate side S) height less than inner cavity M side wall M1 height.
It is the forming process of the soft-package battery of one embodiment of the invention below：
1) packaging film 1 shown in FIG. 1 is used, and pit is gone out (such as Fig. 3 institutes on packaging film 1 by rushing casing tech
Show)；
2) battery core B is put into pit, and doubling packaging film 1 (forming upper layer and lower layer packaging film 1), then to packaging film 1
It carries out hot pressing and forms three encapsulation side S (with reference to Fig. 6)；
3) by the part inflection of correspondence outer end face 131 of the interior fused layer 12 in upper layer and lower layer packaging film 1 beyond metal layer 13
(with reference to Fig. 5 and Fig. 7) on to external protection 11；
4) by positioned at inner cavity M, two of the both sides of W encapsulation side S bend and are adhered to the side wall M1 of inner cavity M in the width direction
Upper (with reference to Fig. 8).
Claims (10)
1. a kind of packaging film (1), including external protection (11), interior fused layer (12) and merged with interior positioned at external protection (11)
Metal layer (13) between layer (12)；
It is characterized in that,
At least one outer end face (121) of the interior fused layer (12) in edge exceeds the correspondence outer end face (131) of metal layer (13).
2. packaging film (1) according to claim 1, which is characterized in that interior fused layer (12) is polypropylene, external protection
(11) it is nylon, metal layer (13) is aluminium foil or steel foil.
3. packaging film (1) according to claim 1, which is characterized in that the outer end face (111) of external protection (11) with it is corresponding
The outer end face (131) of metal layer (13) flushes.
4. packaging film (1) according to claim 1, which is characterized in that two of interior fused layer (12) (W) in the width direction
Outer end face (121) exceeds the correspondence outer end face (131) of metal layer (13) respectively.
5. a kind of soft-package battery, which is characterized in that including：
Battery core (B)；And
Packaging film (1) described in any one of upper layer and lower layer claim 1-4, two layers of packaging film (1) surround receiving electricity at middle part
The inner cavity (M) of core (B) is connected in inner cavity (M) peripheral sealing；
Wherein, on each layer packaging film (1), the part of correspondence outer end face (131) of the interior fused layer (12) beyond metal layer (13)
It is folded back on external protection (11), to coat the correspondence outer end face (131) of metal layer (13).
6. soft-package battery according to claim 5, which is characterized in that interior fused layer (12) is folded back on external protection (11)
Part bond together with external protection (11).
7. soft-package battery according to claim 5, which is characterized in that sealing of two layers of packaging film (1) on the periphery inner cavity (M)
Junction forms multiple encapsulation sides (S), in encapsulation side (S), the interior fused layer (12) of two layers of packaging film (1) directly opposite segments
It is merged.
8. soft-package battery according to claim 7, which is characterized in that in the multiple encapsulation side (S), two of which envelope
Rim (S) is located at the both sides of inner cavity (M) (W) in the width direction, and described two encapsulation sides (S) bend and are adhered to inner cavity (M)
Side wall (M1) on.
9. soft-package battery according to claim 7, which is characterized in that in the multiple encapsulation side (S), one of envelope
Rim (S) is located at the side of inner cavity (M) (L) along its length, and the lug (B1) of battery core (B) is from one encapsulation side (S)
Middle stretching.
10. soft-package battery according to claim 5, which is characterized in that
The upper layer and lower layer packaging film (1) is independent two packaging films；Or
The upper layer and lower layer packaging film (1) is formed by a packaging film doubling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710080426.6A CN108428814B (en) | 2017-02-15 | 2017-02-15 | Packaging film and soft package battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710080426.6A CN108428814B (en) | 2017-02-15 | 2017-02-15 | Packaging film and soft package battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108428814A true CN108428814A (en) | 2018-08-21 |
| CN108428814B CN108428814B (en) | 2021-09-07 |
Family
ID=63155251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710080426.6A Active CN108428814B (en) | 2017-02-15 | 2017-02-15 | Packaging film and soft package battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108428814B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113140841A (en) * | 2020-01-17 | 2021-07-20 | 大众汽车股份公司 | Method and device for connecting metal composite foil of soft package battery monomer and pre-sealing tape |
| WO2021195856A1 (en) * | 2020-03-30 | 2021-10-07 | 宁德新能源科技有限公司 | Packaging structure and battery cell |
| WO2022198612A1 (en) * | 2021-03-26 | 2022-09-29 | 东莞新能安科技有限公司 | Battery, electric device and unmanned aerial vehicle |
| WO2022206382A1 (en) * | 2021-03-29 | 2022-10-06 | 珠海冠宇电池股份有限公司 | Lithium battery |
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| CN102848646A (en) * | 2011-07-01 | 2013-01-02 | 苹果公司 | Battery pouch sheet edge insulation |
| CN103579538A (en) * | 2013-11-14 | 2014-02-12 | 东莞新能源科技有限公司 | Packaging seal structure, preparation method of packaging seal structure and flexibly packaged cell |
| US8790817B2 (en) * | 2008-07-01 | 2014-07-29 | Samsung Sdi Co., Ltd. | Pouch-type lithium secondary battery |
-
2017
- 2017-02-15 CN CN201710080426.6A patent/CN108428814B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8790817B2 (en) * | 2008-07-01 | 2014-07-29 | Samsung Sdi Co., Ltd. | Pouch-type lithium secondary battery |
| CN102848646A (en) * | 2011-07-01 | 2013-01-02 | 苹果公司 | Battery pouch sheet edge insulation |
| CN103579538A (en) * | 2013-11-14 | 2014-02-12 | 东莞新能源科技有限公司 | Packaging seal structure, preparation method of packaging seal structure and flexibly packaged cell |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113140841A (en) * | 2020-01-17 | 2021-07-20 | 大众汽车股份公司 | Method and device for connecting metal composite foil of soft package battery monomer and pre-sealing tape |
| CN113140841B (en) * | 2020-01-17 | 2024-01-16 | 大众汽车股份公司 | Method and device for connecting metal composite foil of soft package battery cell and pre-sealing tape |
| WO2021195856A1 (en) * | 2020-03-30 | 2021-10-07 | 宁德新能源科技有限公司 | Packaging structure and battery cell |
| JP2022530583A (en) * | 2020-03-30 | 2022-06-30 | 寧徳新能源科技有限公司 | Package structure and battery cell |
| WO2022198612A1 (en) * | 2021-03-26 | 2022-09-29 | 东莞新能安科技有限公司 | Battery, electric device and unmanned aerial vehicle |
| WO2022206382A1 (en) * | 2021-03-29 | 2022-10-06 | 珠海冠宇电池股份有限公司 | Lithium battery |
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| Publication number | Publication date |
|---|---|
| CN108428814B (en) | 2021-09-07 |
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