CN107546404B - Winding type battery cell - Google Patents
Winding type battery cell Download PDFInfo
- Publication number
- CN107546404B CN107546404B CN201610489871.3A CN201610489871A CN107546404B CN 107546404 B CN107546404 B CN 107546404B CN 201610489871 A CN201610489871 A CN 201610489871A CN 107546404 B CN107546404 B CN 107546404B
- Authority
- CN
- China
- Prior art keywords
- current collector
- pole piece
- active material
- material layer
- blank
- 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.)
- Active
Links
- 238000004804 winding Methods 0.000 title claims abstract description 45
- 239000011149 active material Substances 0.000 claims abstract description 29
- 239000003292 glue Substances 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000007773 negative electrode material Substances 0.000 claims description 5
- 239000007774 positive electrode material Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 9
- 229910052782 aluminium Inorganic materials 0.000 description 9
- 239000011888 foil Substances 0.000 description 9
- 238000002955 isolation Methods 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 5
- 239000011889 copper foil Substances 0.000 description 5
- 238000000926 separation method Methods 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910003481 amorphous carbon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention provides a coiled cell having two major faces and two side faces, comprising: the first pole piece, the second pole piece and the isolating film. The first pole piece includes: a first current collector; a first active material layer. The second pole piece includes: a second current collector; and a second active material layer. At the winding ending position of the winding type battery cell, the front surface and the back surface of the first current collector are not coated with the first active material layer and are defined as first blank current collectors, and the front surface and the back surface of the second current collector are not coated with the second active material layer and are defined as second blank current collectors. The length of the first blank current collector is greater than that of the second blank current collector. The part of the first blank current collector, which exceeds the second blank current collector, forms a folding part of the first blank current collector, and the folding part wraps at least one of the two large faces and the two side faces of the winding type battery cell. When the coiled battery cell is subjected to the nailing test, the nailing effect is good, and the use safety of the battery cell is improved.
Description
Technical Field
The invention relates to the field of batteries, in particular to a winding type battery cell.
Background
In the prior art, positive and negative electrode plates of a lithium ion battery are wound into a battery core, and as the positive and negative electrode plates are terminated by a dressing area, when a penetrating nail test is carried out, after a steel needle penetrates into a fully charged battery, the positive and negative electrode plates with the dressing are instantaneously short-circuited, a large amount of heat is immediately discharged, and the lithium ion battery is extremely easy to ignite and burn. In order to improve the nailing performance of the battery, the prior art adopts a structure that a section of lengthened hollow aluminum foil is arranged at the tail part of a positive plate, a section of lengthened hollow copper foil is arranged at the tail part of a negative plate, a diaphragm is lengthened, and the hollow aluminum foil, the diaphragm and the hollow copper foil are sequentially arranged from outside to inside to surround the outer circle of the battery core, and the structure is called as a waistcoat (MJ) structure, so that when an external sharp conductor pierces the battery, the hollow aluminum foil and the hollow copper foil can be rapidly shorted, and short-circuit current of the hollow aluminum foil and an Anode plate (Al-Anode), and the Anode plate and a Cathode plate (Anode-Cathode) is shunted, so that electric quantity in the battery core is discharged to prevent the battery from igniting, and the safety of the battery is improved.
However, some problems still exist in the prior art: first, the energy density of the cell is reduced because the MJ structure does not contain active material, the more surrounding layers, the lower the energy density, and the greater the energy loss for a larger surface area, especially with thinner cells. Second, the cost is increased because the structure includes one empty copper foil, one empty aluminum foil, two diaphragms, and the use area is large. Again, there is no improvement in special cases, because the melting point of the empty aluminum foil is low, when the capacity of the battery cell is too large, or the size of the battery cell changes, the empty aluminum foil is fused to cause the shunt effect of the MJ structure to disappear, in which case the number of turns of the empty aluminum foil can only be increased for the MJ structure to improve the effect, thus causing the problems of the prior cost improvement and energy density reduction.
Disclosure of Invention
In view of the problems existing in the background art, the invention aims to provide a winding type battery cell, which improves the use safety of the battery cell, increases the energy density of the battery cell, reduces the cost and has good nailing effect when used for nailing test.
In order to achieve the above object, the present invention provides a wound cell having two large faces and two side faces, comprising: the first pole piece, the second pole piece and the isolating film.
The first pole piece includes: a first current collector; and a first active material layer coated on a surface of the first current collector. The second pole piece is opposite to the first pole piece in electric polarity, and comprises: a second current collector; and a second active material layer coated on a surface of the second current collector. The isolation film is arranged between the second pole piece and the first pole piece.
At the winding ending position of the winding type battery cell, the front surface and the back surface of the first current collector are not coated with the first active material layer and are defined as first blank current collectors, and the front surface and the back surface of the second current collector are not coated with the second active material layer and are defined as second blank current collectors.
At the winding ending position of the winding type battery cell, the first pole piece is positioned at the outermost layer of the winding type battery cell, and the length of the first blank current collector is larger than that of the second blank current collector. The part of the first blank current collector, which exceeds the second blank current collector, forms a folding part of the first blank current collector, and the folding part wraps at least one of the two large faces and the two side faces of the winding type battery cell.
The beneficial effects of the invention are as follows:
in the winding type battery cell, as the first blank current collector is longer than the second blank current collector and the part of the first blank current collector exceeding the second blank current collector wraps at least one of two large faces and two side faces of the winding type battery cell, the first blank current collector wraps at least one layer more than the second blank current collector on the at least one face, and then when a threading test is carried out, the first blank current collector and the second blank current collector can be rapidly short-circuited, the threading effect is good, and the use safety of the battery cell is improved. In addition, at the winding ending position of the winding type battery cell, the first pole piece, the second pole piece and the isolating film are not required to be wound for a plurality of circles at the same time, so that a good nailing effect can be achieved, the energy density of the battery cell is increased, and the cost is reduced.
Drawings
FIG. 1 is a winding schematic of a wound cell in one embodiment according to the present invention;
fig. 2 is a winding schematic of a wound cell in another embodiment according to the present invention;
fig. 3 is a winding schematic of a wound cell in yet another embodiment according to the present invention;
fig. 4 is a winding schematic of a wound cell according to the present invention in yet another embodiment.
Wherein reference numerals are as follows:
1 first pole piece S2 second blank current collector
11 the ending end of the second pole piece of the first current collector E0
12 first active material layer 3 separator
S1 first blank Current collector 31 first isolation film
S11 folding portion E1 ending end of first isolation film
S111 crease 32 second separator
2 second pole piece E2 second isolation film ending end
21 second current collector 4 fixing adhesive
22 second active material layer
Detailed Description
The wound cell according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1 to 4, a winding type battery cell according to the present invention has two large faces and two side faces, including: a first pole piece 1, a second pole piece 2 and a separation film 3.
The first pole piece 1 comprises: a first current collector 11; and a first active material layer 12 coated on a surface of the first current collector 11. The second pole piece 2 has opposite electric polarity to the first pole piece 1, and comprises: a second current collector 21; and a second active material layer 22 coated on the surface of the second current collector 11. The separation film 3 is disposed between the second pole piece 2 and the first pole piece 1.
At the winding end of the winding type cell, the first active material layer 12 is not coated on both the front and back surfaces of the first current collector 11 and is defined as a first blank current collector S1, and the second active material layer is not coated on both the front and back surfaces of the second current collector 21 and is defined as a second blank current collector S2.
At the winding ending position of the winding type battery cell, the first pole piece 1 is positioned at the outermost layer of the winding type battery cell, and the length of the first blank current collector S1 is greater than that of the second blank current collector S2. The portion of the first blank current collector S1 beyond the second blank current collector S2 forms a folded portion S11 of the first blank current collector S1, and the folded portion S11 wraps at least one of the two large faces and the two side faces of the winding type cell. In the winding type battery cell according to the invention, as the first blank current collector S1 is longer than the second blank current collector S2, and at least one of the two large faces and the two side faces of the winding type battery cell is wrapped by the part of the first blank current collector S1 beyond the second blank current collector S2, the first blank current collector S1 is wrapped by at least one layer more than the second blank current collector S2 on the at least one face, and therefore, when a threading test is performed, short circuit can be rapidly generated between the first blank current collector S1 and the second blank current collector S2, the threading effect is good, and the use safety of the battery cell is improved. In addition, at the winding ending position of the winding type battery cell, the first pole piece 1, the second pole piece 2 and the isolating film 3 can be wound for a plurality of times at the same time, so that a good nailing effect can be realized, the energy density of the battery cell is increased, and the cost is reduced.
According to the winding type cell of the present invention, in an embodiment, referring to fig. 1 to 4, the separator 3 includes: a first separator 31; and a second separator 32.
In one embodiment, the first and second separation films 31 and 32 may be connected to each other to form one strip.
In an embodiment, the first and second separation films 31 and 32 may be two separate strips.
In one embodiment, the first electrode sheet 1 is a positive electrode sheet and the second electrode sheet 2 is a negative electrode sheet, the first current collector 11 is a positive electrode current collector and the second current collector 21 is a negative electrode current collector, the first active material layer 12 is a positive electrode active material layer and the second active material layer 22 is a negative electrode active material layer. Or the first electrode sheet 1 is a negative electrode sheet and the second electrode sheet 2 is a positive electrode sheet, the first current collector 11 is a negative electrode current collector and the second current collector 21 is a positive electrode current collector, the first active material layer 12 is a negative electrode active material layer and the second active material layer 22 is a positive electrode active material layer.
In an embodiment, referring to fig. 1-4, the ending end E0 of the second pole piece does not exceed the ending end E1 of the first separator and the ending end E2 of the second separator. The purpose of such winding is to avoid exposing the trailing end E0 of the second pole piece to the outside of the first and second separator films 31 and 32, thereby preventing the positive and negative poles from being shorted, and helping to protect the use safety of the wound battery cell.
In an embodiment, referring to fig. 1, a portion of the first blank current collector S1 beyond the second blank current collector S2 is bent along the winding direction to form a folded portion S11 of the first blank current collector S1 with a crease S111, and a portion of the folded portion S11 extends between the first separator 31 and the first pole piece 1 to wrap at least one large surface of the wound battery cell.
In an embodiment, the portion of the folded portion S11 extending between the first separator 3 and the first pole piece 1 does not exceed the end of the second blank current collector S2 away from the fold S111, so that the energy density of the wound cell is not affected while the nailing effect is ensured.
In an embodiment, the ending end E1 of the first separator does not exceed the ending end E2 of the second separator, or the ending end E2 of the second separator does not exceed the ending end E1 of the first separator. It is added here that the length of the first isolation film 31 is different from the length of the second isolation film 32 to facilitate the subsequent rubberizing fixation.
In an embodiment, the portion of the first blank current collector S1 beyond the second blank current collector S2 is bent reversely along the winding direction to form a folded portion S11 of the first blank current collector S1 with a crease S111, and the folded portion S11 is located on the surface of the winding type battery cell.
In one embodiment, referring to fig. 2 and 4, the fold S11 wraps one of the major faces of the wound cell.
In one embodiment, the fold S11 wraps two large sides of the wound cell.
In an embodiment, referring to fig. 3, the folded portion S11 wraps two large faces and two side faces of the coiled battery cell, so that the coiled battery cell is wrapped in an omnibearing manner, and adaptability to penetrating nail tests of different faces is enhanced.
In an embodiment, the folds S111 of the folded portion S11 may be one or more.
In an embodiment, referring to fig. 4, when the folds S111 of the folded portion S11 are more than two, the folded portion S11 is in a shape of a "Z", so that the heat dissipation of the folded portion S11 when the surface (the upper large surface in fig. 4) of the wound battery cell where the more than two folds S111 are located is greatly enhanced, and meanwhile, the thickness and strength of the folded portion S11 are increased, the risk of fusing is reduced, and the reliability of the threading test is improved.
In an embodiment, referring to fig. 1 to 4, the end of the folded portion S11 may be stuck with a fixing adhesive 4. The supplementary note here is that the fixing adhesive 4 is adhered to fix the end of the folded portion S11. In fig. 1, the fixing adhesive 4 also serves to prevent the folded portion S11 from piercing the first separator 31, and for this purpose, the fixing adhesive 4 may be adhered to the surface of the first separator 31 corresponding to the end of the folded portion S11.
In an embodiment, referring to fig. 1 to 4, a fixing glue 4 may be adhered at a crease S111 of the folded portion S11. It is added here that the fixing glue 4 is adhered to the outer side of the fold S111 to fix the fold S111, and the fixing glue 4 is adhered between the first separator 31 and the second separator 32 to prevent the fold S111 from directly contacting the second blank current collector S2. In fig. 1, the fixing glue 4 may be adhered to the inner side of the fold S111, and the purpose of preventing the fold S111 from contacting the second blank current collector S2 may be achieved.
In one embodiment, the fixing glue 4 may be a green glue.
In one embodiment, the material of the isolation film 3 may be polypropylene or polyethylene.
In one embodiment, the positive current collector may be aluminum foil and the negative current collector may be copper foil.
In an embodiment, the negative electrode active material in the negative electrode active material layer may be selected from one or more of artificial graphite, natural graphite, amorphous carbon, hard carbon.
In an embodiment, the positive electrode active material in the positive electrode active material layer may be selected from one or more of lithium cobaltate, lithium manganate, ternary material, and lithium iron phosphate.
Claims (10)
1. A coiled electrical cell having two major faces and two side faces, comprising;
a first pole piece comprising:
a first current collector; and
a first active material layer coated on a surface of the first current collector;
a second pole piece, opposite in electrical polarity to the first pole piece, comprising:
a second current collector; and
a second active material layer coated on a surface of the second current collector;
the isolating film is arranged between the second pole piece and the first pole piece;
at the winding ending position of the winding type battery cell, the front and back surfaces of the first current collector are not coated with the first active material layer and are defined as first blank current collectors, and the front and back surfaces of the second current collector are not coated with the second active material layer and are defined as second blank current collectors;
it is characterized in that the method comprises the steps of,
at the winding ending position of the winding type battery cell, the first pole piece is positioned at the outermost layer of the winding type battery cell, and the length of the first blank current collector is longer than that of the second blank current collector;
the part of the first blank current collector, which exceeds the second blank current collector, forms a folding part of the first blank current collector, and the folding part wraps at least one of the two large faces and the two side faces of the winding type battery cell.
2. The coiled cell of claim 1, wherein the separator comprises:
a first separator; and
and a second separator.
3. The coiled electrical cell of claim 1, wherein the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, the first current collector is a positive current collector and the second current collector is a negative current collector, the first active material layer is a positive active material layer and the second active material layer is a negative active material layer; or alternatively
The first pole piece is a negative pole piece, the second pole piece is a positive pole piece, the first current collector is a negative pole current collector, the second current collector is a positive pole current collector, the first active material layer is a negative pole active material layer, and the second active material layer is a positive pole active material layer.
4. The coiled electrical cell of claim 2, wherein,
the ending end of the second pole piece is not more than the ending end of the first isolating film and the ending end of the second isolating film.
5. The coiled electrical cell of claim 4, wherein a portion of the first blank current collector that exceeds the second blank current collector is folded in a coiling direction to form a fold of the first blank current collector having a crease, and a portion of the fold extends between the first separator and the first pole piece to encapsulate at least one major surface of the coiled electrical cell.
6. The coiled cell of claim 5, wherein a portion of the fold extending between the first separator and the first pole piece does not exceed an end of the second blank current collector distal from the fold.
7. The coiled electrical cell of claim 4, wherein the portion of the first blank current collector that exceeds the second blank current collector is folded back in the coiling direction to form a fold of the first blank current collector having a crease, and the fold is located on a surface of the coiled electrical cell.
8. The coiled electrical cell of claim 7, wherein the electrical cell,
the folding part wraps one large surface of the winding type battery cell; or (b)
The folding part wraps the two large surfaces of the winding type battery cell.
9. The coiled cell of claim 7, wherein the fold of the fold is one or more.
10. The coiled electrical cell of claim 2, wherein,
the tail end of the folding part is stuck with a fixing adhesive;
the crease of the folding part is stuck with fixing glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610489871.3A CN107546404B (en) | 2016-06-28 | 2016-06-28 | Winding type battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610489871.3A CN107546404B (en) | 2016-06-28 | 2016-06-28 | Winding type battery cell |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107546404A CN107546404A (en) | 2018-01-05 |
| CN107546404B true CN107546404B (en) | 2024-04-05 |
Family
ID=60962947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610489871.3A Active CN107546404B (en) | 2016-06-28 | 2016-06-28 | Winding type battery cell |
Country Status (1)
| Country | Link |
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| CN (1) | CN107546404B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019200538A1 (en) * | 2018-04-17 | 2019-10-24 | 宁德新能源科技有限公司 | Battery cell and battery |
| CN110474104A (en) * | 2018-05-09 | 2019-11-19 | 郑州宇通集团有限公司 | A kind of takeup type battery core and the battery using the takeup type battery core |
| CN108987794B (en) * | 2018-07-17 | 2020-10-23 | 惠州市豪鹏科技有限公司 | Soft package type lithium ion battery and nail penetration testing method |
| CN114447342B (en) * | 2022-04-08 | 2022-07-26 | 宁德新能源科技有限公司 | Electrochemical device and electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007059387A (en) * | 2005-07-28 | 2007-03-08 | Matsushita Electric Ind Co Ltd | Electrode for lithium ion secondary battery |
| CN1988240A (en) * | 2005-12-23 | 2007-06-27 | 深圳市比克电池有限公司 | Winding type soft package lithium ion battery and its preparing method |
| CN203733899U (en) * | 2013-11-28 | 2014-07-23 | 东莞新能源科技有限公司 | Wound-type lithium ion cell |
| CN105703010A (en) * | 2014-11-28 | 2016-06-22 | 宁德时代新能源科技股份有限公司 | Electrode slice and electrochemical energy storage device |
| CN205828575U (en) * | 2016-06-28 | 2016-12-21 | 宁德新能源科技有限公司 | Takeup type battery core |
-
2016
- 2016-06-28 CN CN201610489871.3A patent/CN107546404B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007059387A (en) * | 2005-07-28 | 2007-03-08 | Matsushita Electric Ind Co Ltd | Electrode for lithium ion secondary battery |
| CN1988240A (en) * | 2005-12-23 | 2007-06-27 | 深圳市比克电池有限公司 | Winding type soft package lithium ion battery and its preparing method |
| CN203733899U (en) * | 2013-11-28 | 2014-07-23 | 东莞新能源科技有限公司 | Wound-type lithium ion cell |
| CN105703010A (en) * | 2014-11-28 | 2016-06-22 | 宁德时代新能源科技股份有限公司 | Electrode slice and electrochemical energy storage device |
| CN205828575U (en) * | 2016-06-28 | 2016-12-21 | 宁德新能源科技有限公司 | Takeup type battery core |
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| Publication number | Publication date |
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| CN107546404A (en) | 2018-01-05 |
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