US20170288274A1 - Wound-type cell and winding mandrel - Google Patents
Wound-type cell and winding mandrel Download PDFInfo
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- US20170288274A1 US20170288274A1 US15/457,778 US201715457778A US2017288274A1 US 20170288274 A1 US20170288274 A1 US 20170288274A1 US 201715457778 A US201715457778 A US 201715457778A US 2017288274 A1 US2017288274 A1 US 2017288274A1
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- current collector
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- electrode plate
- type cell
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- 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
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- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
- H01M10/0409—Machines for assembling batteries for cells with wound electrodes
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- 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
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
-
- H01M2/263—
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- 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
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
-
- 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
Definitions
- the present disclosure relates to the field of battery, and particularly relates to a wound-type cell and a winding mandrel.
- a blank positive current collector 111 Al foil
- a blank negative current collector 211 Cu foil
- the inside of the wound-type cell needs to redundantly wind a part of separator 3 which is positioned between the blank positive current collector 111 and the blank negative current collector 211 and is beyond the blank positive current collector 111 and the blank negative current collector 211 , and this will not only lead to the waste of separator, but also increase a thickness of the wound-type cell and reduce the energy density of the wound-type cell.
- an object of the present disclosure is to provide a wound-type cell and a winding mandrel, which can reduce a usage amount of a separator and a thickness of the wound-type cell, and improve the energy density of the wound-type cell.
- the present disclosure provides a wound-type cell, which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector, and the first electrode plate further has a blank first current collector which is positioned at a first winding start end and is not coated with the first active material layer; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and the second electrode plate further has a blank second current collector which is positioned at a second winding start end and is not coated with the second active material layer, and the blank second current collector is positioned at an inner side of the blank first current collector in a thickness direction; a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate; a first electrode tab electrically connected to the blank first current collector; and a second electrode tab electrically connected to the blank second current collector.
- a first end of the blank first current collector is beyond a second end of the blank second current collector in a length direction, and a position of the first electrode tab is beyond the second end of the blank second current collector in the length direction; at least a part of a third winding start end of the separator is folded back to an inner side in the thickness direction and is positioned between the first electrode tab and the second electrode tab in the length direction.
- the present disclosure provides a winding mandrel, which is used for winding the wound-type cell according to the first aspect of the present disclosure
- the winding mandrel comprises a first winding mandrel and a second winding mandrel which are sequentially provided along the length direction, a first end surface of the first winding mandrel and a second end surface of the second winding mandrel face each other and form a clamping groove; an end of the first end surface which is close to the blank second current collector is beyond an end of the first end surface which is away from the blank second current collector in the length direction; an end of the second end surface which is close to the blank second current collector is beyond an end of the second end surface which is away from the blank second current collector in the length direction.
- the present disclosure has the following beneficial effects: in the wound-type cell and the winding mandrel according to the present disclosure, because a length of the blank second current collector is reduced, there is no need to redundantly wind the third winding start end of the separator in large length as in the prior art, thereby reducing a usage amount of the separator and the cost of the separator.
- the third winding start end is positioned between the first electrode tab and the second electrode tab in the length direction, a thickness of the third winding start end of the separator will not be overlapped with a thickness of the first electrode tab and a thickness of the second electrode tab, thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell.
- FIG. 1 is a schematic view of a wound-type cell and a winding mandrel of the prior art.
- FIG. 2 is a schematic view of a wound-type cell and a winding mandrel according to the present disclosure, in which a first winding start end, a second winding start end and a third winding start end each are indicated by a dotted line frame.
- FIG. 3 is a schematic view of the wound-type cell according to the present disclosure, in which the first winding start end, the second winding start end and the third winding start end each are indicated by a dotted line frame.
- a wound-type cell comprises: a first electrode plate 1 having a first current collector 11 and a first active material layer 12 coated on a surface of the first current collector 11 , and the first electrode plate 1 further has a blank first current collector 111 which is positioned at a first winding start end E 1 and is not coated with the first active material layer 12 ; a second electrode plate 2 having a second current collector 21 and a second active material layer 22 coated on a surface of the second current collector 21 , and the second electrode plate 2 further has a blank second current collector 211 which is positioned at a second winding start end E 2 and is not coated with the second active material layer 22 , and the blank second current collector 211 is positioned at an inner side of the blank first current collector 111 in a thickness direction T; a separator 3 provided between the first electrode plate 1 and the second electrode plate 2 to separate the first electrode plate 1 from the second electrode plate 2 ; a first electrode tab 4 electrically connected to the blank first
- a first end 111 E of the blank first current collector 111 is beyond a second end 211 E of the blank second current collector 211 in a length direction L, and a position of the first electrode tab 4 is beyond the second end 211 E of the blank second current collector 211 in the length direction L; at least a part of a third winding start end E 3 of the separator 3 is folded back to an inner side in the thickness direction T and is positioned between the first electrode tab 4 and the second electrode tab 5 in the length direction L.
- the wound-type cell because a length of the blank second current collector 211 is reduced, there is no need to redundantly wind the third winding start end E 3 of the separator 3 in large length as in the prior art, thereby reducing a usage amount of the separator 3 and the cost of the separator 3 .
- a thickness of the third winding start end E 3 of the separator 3 will not be overlapped with a thickness of the first electrode tab 4 and a thickness of the second electrode tab 5 as the cell shown in FIG. 1 , thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell.
- the third winding start end E 3 of the separator 3 is formed by two layers in the thickness direction T.
- the third winding start end E 3 is a part of one layer and a part of the other layer which are clamped in a clamping groove G of a later mentioned winding mandrel; in the formed wound-type cell, the third winding start end E 3 of the separator 3 is two layers, preferably, the two layers are attached together.
- the first electrode plate 1 may be a positive electrode plate or a negative electrode plate
- the second electrode plate 2 may be a negative electrode plate or a positive electrode plate.
- the first electrode plate 1 is a positive electrode plate and the second electrode plate 2 is a negative electrode plate
- the first active material layer 12 is a positive active material layer
- the first active material layer 12 may be selected from at least one of lithium cobalt oxide (LiCoO 2 ), lithium ferric phosphate (LiFePO 4 ) and lithium manganese oxide (LiMn 2 O 4 ).
- the second active material layer 22 is a negative active material layer, and specifically, the second active material layer 22 may be selected from at least one of carbon and silicon.
- the first current collector 11 is an aluminum foil
- the second current collector 21 is a copper foil
- the first electrode tab 4 is fixed to the blank first current collector 111 by welding.
- the second electrode tab 5 is fixed to the blank second current collector 211 by welding.
- the welding is laser welding, ultrasonic welding or resistance welding.
- the thickness of the first electrode tab 4 is more than a thickness of the first current collector 11 . This can ensure a connection strength and an overcurrent sectional area of the first electrode tab 4 .
- the thickness of second electrode tab 5 is more than a thickness of the second current collector 21 . This can ensure a connection strength and an overcurrent sectional area of the second electrode tab 5 .
- a side of the second current collector 21 which directly faces the blank first current collector 111 is not coated with the second active material layer 22 . Because the blank first current collector 111 is not coated with the first active material layer 12 , if the side of the second current collector 21 which directly faces the blank first current collector 111 is coated with the second active material layer 22 , it is not only helpless to the capacity (lithium-ions cannot realize the reciprocating process of intercalation and deintercalation between the blank first current collector 111 and the second current collector 21 that directly faces the blank first current collector 111 ) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the second current collector 21 which directly faces the blank first current collector 111 may be not coated with the second active material layer 22 , and this will avoid waste in material and improve the energy density of the wound-type cell.
- a side of the first current collector 11 which directly faces the blank second current collector 211 is not coated with the first active material layer 12 . Because the blank second current collector 211 is not coated with the second active material layer 22 , if the side of the first current collector 11 which directly faces the blank second current collector 211 is coated with the first active material layer 12 , it is not only helpless to the capacity (lithium-ion cannot realize the reciprocating process of intercalation and deintercalation between the blank second current collector 211 and the first current collector 11 which directly faces the blank second current collector 211 ) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the first current collector 11 which directly faces the blank second current collector 211 may be not coated with the first active material layer 12 , and this will avoid waste in material and improve the energy density of the wound-type cell.
- an inner side of an arc-shaped portion C of the second current collector 21 which directly faces the first end 111 E of the blank first current collector 111 is not coated with the second active material layer 22 .
- the inner side of the arc-shaped portion C may be not coated with the second active material layer 22 , and this will avoid waste in material and improve the energy density of the wound-type cell.
- a winding mandrel according to a second aspect of the present disclosure is used for winding the wound-type cell according to the first aspect of the present disclosure
- the winding mandrel comprises a first winding mandrel S 1 and a second winding mandrel S 2 which are sequentially provided along the length direction L, a first end surface S 11 of the first winding mandrel S 1 and a second end surface S 21 of the second winding mandrel S 2 face each other and form a clamping groove G; an end of the first end surface S 11 which is close to the blank second current collector 211 is beyond an end of the first end surface S 11 which is away from the blank second current collector 211 in the length direction L; correspondingly, an end of the second end surface S 21 which is close to the blank second current collector 211 is beyond an end of the second end surface S 21 which is away from the blank second current collector 211 in the length direction L.
- the first end surface S 11 and the second end surface S 21 are parallel to each other.
- an angle between the first end surface S 11 and a first side surface S 12 of the first winding mandrel S 1 which is close to the blank second current collector 211 is between 20 degrees and 70 degrees; correspondingly, an angle between the second end surface S 21 and a second side surface S 22 of the second winding mandrel S 2 which is close to the blank second current collector 211 is between 160 degrees and 110 degrees.
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- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Materials Engineering (AREA)
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Abstract
Description
- The present application claims priority to Chinese patent application No. 201610195191.0, filed on Mar. 31, 2016, which is incorporated herein by reference in its entirety.
- The present disclosure relates to the field of battery, and particularly relates to a wound-type cell and a winding mandrel.
- With the commercial development of Lithium-ion cell, the requirement of market on energy density of the Lithium-ion cell is becoming higher and higher. Referring to
FIG. 1 , at a winding start end of a conventional wound-type cell, a blank positive current collector 111 (Al foil) is shorter than a blank negative current collector 211 (Cu foil) which is positioned at an inner side of the blank positivecurrent collector 111, so the inside of the wound-type cell needs to redundantly wind a part ofseparator 3 which is positioned between the blank positivecurrent collector 111 and the blank negativecurrent collector 211 and is beyond the blank positivecurrent collector 111 and the blank negativecurrent collector 211, and this will not only lead to the waste of separator, but also increase a thickness of the wound-type cell and reduce the energy density of the wound-type cell. - In view of the problem existing in the background, an object of the present disclosure is to provide a wound-type cell and a winding mandrel, which can reduce a usage amount of a separator and a thickness of the wound-type cell, and improve the energy density of the wound-type cell.
- In order to achieve the above object, in a first aspect, the present disclosure provides a wound-type cell, which comprises: a first electrode plate having a first current collector and a first active material layer coated on a surface of the first current collector, and the first electrode plate further has a blank first current collector which is positioned at a first winding start end and is not coated with the first active material layer; a second electrode plate having a second current collector and a second active material layer coated on a surface of the second current collector, and the second electrode plate further has a blank second current collector which is positioned at a second winding start end and is not coated with the second active material layer, and the blank second current collector is positioned at an inner side of the blank first current collector in a thickness direction; a separator provided between the first electrode plate and the second electrode plate to separate the first electrode plate from the second electrode plate; a first electrode tab electrically connected to the blank first current collector; and a second electrode tab electrically connected to the blank second current collector. A first end of the blank first current collector is beyond a second end of the blank second current collector in a length direction, and a position of the first electrode tab is beyond the second end of the blank second current collector in the length direction; at least a part of a third winding start end of the separator is folded back to an inner side in the thickness direction and is positioned between the first electrode tab and the second electrode tab in the length direction.
- In order to achieve the above object, in a second aspect, the present disclosure provides a winding mandrel, which is used for winding the wound-type cell according to the first aspect of the present disclosure, the winding mandrel comprises a first winding mandrel and a second winding mandrel which are sequentially provided along the length direction, a first end surface of the first winding mandrel and a second end surface of the second winding mandrel face each other and form a clamping groove; an end of the first end surface which is close to the blank second current collector is beyond an end of the first end surface which is away from the blank second current collector in the length direction; an end of the second end surface which is close to the blank second current collector is beyond an end of the second end surface which is away from the blank second current collector in the length direction.
- The present disclosure has the following beneficial effects: in the wound-type cell and the winding mandrel according to the present disclosure, because a length of the blank second current collector is reduced, there is no need to redundantly wind the third winding start end of the separator in large length as in the prior art, thereby reducing a usage amount of the separator and the cost of the separator. In addition, because the third winding start end is positioned between the first electrode tab and the second electrode tab in the length direction, a thickness of the third winding start end of the separator will not be overlapped with a thickness of the first electrode tab and a thickness of the second electrode tab, thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell. At the same time, it is easy to realize automatic production of the wound-type cell of the present disclosure.
-
FIG. 1 is a schematic view of a wound-type cell and a winding mandrel of the prior art. -
FIG. 2 is a schematic view of a wound-type cell and a winding mandrel according to the present disclosure, in which a first winding start end, a second winding start end and a third winding start end each are indicated by a dotted line frame. -
FIG. 3 is a schematic view of the wound-type cell according to the present disclosure, in which the first winding start end, the second winding start end and the third winding start end each are indicated by a dotted line frame. -
- 1 first electrode plate
- 11 first current collector
- 111 blank first current collector
- 111E first end
- 12 first active material layer
- 2 second electrode plate
- 21 second current collector
- 211 blank second current collector
- 211E second end
- 22 second active material layer
- 3 separator
- 4 first electrode tab
- 5 second electrode tab
- E1 first winding start end
- E2 second winding start end
- E3 third winding start end
- C arc-shaped portion
- S1 first winding mandrel
- S11 first end surface
- S12 first side surface
- S2 second winding mandrel
- S21 second end surface
- S22 second side surface
- G clamping groove
- L length direction
- T thickness direction
- Hereinafter a wound-type cell and a winding mandrel according to the present disclosure will be described in detail in combination with the figures.
- Firstly, a wound-type cell according to a first aspect of the present disclosure will be described.
- Referring to
FIG. 2 andFIG. 3 , a wound-type cell according to the present disclosure comprises: afirst electrode plate 1 having a firstcurrent collector 11 and a firstactive material layer 12 coated on a surface of the firstcurrent collector 11, and thefirst electrode plate 1 further has a blank firstcurrent collector 111 which is positioned at a first winding start end E1 and is not coated with the firstactive material layer 12; asecond electrode plate 2 having a secondcurrent collector 21 and a secondactive material layer 22 coated on a surface of the secondcurrent collector 21, and thesecond electrode plate 2 further has a blank secondcurrent collector 211 which is positioned at a second winding start end E2 and is not coated with the secondactive material layer 22, and the blank secondcurrent collector 211 is positioned at an inner side of the blank firstcurrent collector 111 in a thickness direction T; aseparator 3 provided between thefirst electrode plate 1 and thesecond electrode plate 2 to separate thefirst electrode plate 1 from thesecond electrode plate 2; afirst electrode tab 4 electrically connected to the blank firstcurrent collector 111; and asecond electrode tab 5 electrically connected to the blank secondcurrent collector 211. Afirst end 111E of the blank firstcurrent collector 111 is beyond asecond end 211E of the blank secondcurrent collector 211 in a length direction L, and a position of thefirst electrode tab 4 is beyond thesecond end 211E of the blank secondcurrent collector 211 in the length direction L; at least a part of a third winding start end E3 of theseparator 3 is folded back to an inner side in the thickness direction T and is positioned between thefirst electrode tab 4 and thesecond electrode tab 5 in the length direction L. - In the wound-type cell according to the present disclosure, because a length of the blank second
current collector 211 is reduced, there is no need to redundantly wind the third winding start end E3 of theseparator 3 in large length as in the prior art, thereby reducing a usage amount of theseparator 3 and the cost of theseparator 3. In addition, because at least a part of the third winding start end E3, which is folded back to the inner side in thickness direction T, is positioned between thefirst electrode tab 4 and thesecond electrode tab 5 in the length direction L, a thickness of the third winding start end E3 of theseparator 3 will not be overlapped with a thickness of thefirst electrode tab 4 and a thickness of thesecond electrode tab 5 as the cell shown inFIG. 1 , thereby reducing a thickness of the wound-type cell and improve the energy density of the wound-type cell. At the same time, it is easy to realize automatic production of the wound-type cell of the present disclosure. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 3 , the third winding start end E3 of theseparator 3 is formed by two layers in the thickness direction T. The third winding start end E3 is a part of one layer and a part of the other layer which are clamped in a clamping groove G of a later mentioned winding mandrel; in the formed wound-type cell, the third winding start end E3 of theseparator 3 is two layers, preferably, the two layers are attached together. - In an embodiment of the wound-type cell according to the present disclosure, the
first electrode plate 1 may be a positive electrode plate or a negative electrode plate, correspondingly, thesecond electrode plate 2 may be a negative electrode plate or a positive electrode plate. Preferably, thefirst electrode plate 1 is a positive electrode plate and thesecond electrode plate 2 is a negative electrode plate, correspondingly, the firstactive material layer 12 is a positive active material layer, and specifically, the firstactive material layer 12 may be selected from at least one of lithium cobalt oxide (LiCoO2), lithium ferric phosphate (LiFePO4) and lithium manganese oxide (LiMn2O4). The secondactive material layer 22 is a negative active material layer, and specifically, the secondactive material layer 22 may be selected from at least one of carbon and silicon. - In an embodiment of the wound-type cell according to the present disclosure, the first
current collector 11 is an aluminum foil, the secondcurrent collector 21 is a copper foil. - In an embodiment of the wound-type cell according to the present disclosure, the
first electrode tab 4 is fixed to the blank firstcurrent collector 111 by welding. - In an embodiment of the wound-type cell according to the present disclosure, the
second electrode tab 5 is fixed to the blank secondcurrent collector 211 by welding. - In an embodiment of the wound-type cell according to the present disclosure, the welding is laser welding, ultrasonic welding or resistance welding.
- In an embodiment of the wound-type cell according to the present disclosure, the thickness of the
first electrode tab 4 is more than a thickness of the firstcurrent collector 11. This can ensure a connection strength and an overcurrent sectional area of thefirst electrode tab 4. - In an embodiment of the wound-type cell according to the present disclosure, the thickness of
second electrode tab 5 is more than a thickness of the secondcurrent collector 21. This can ensure a connection strength and an overcurrent sectional area of thesecond electrode tab 5. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 2 andFIG. 3 , a side of the secondcurrent collector 21 which directly faces the blank firstcurrent collector 111 is not coated with the secondactive material layer 22. Because the blank firstcurrent collector 111 is not coated with the firstactive material layer 12, if the side of the secondcurrent collector 21 which directly faces the blank firstcurrent collector 111 is coated with the secondactive material layer 22, it is not only helpless to the capacity (lithium-ions cannot realize the reciprocating process of intercalation and deintercalation between the blank firstcurrent collector 111 and the secondcurrent collector 21 that directly faces the blank first current collector 111) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the secondcurrent collector 21 which directly faces the blank firstcurrent collector 111 may be not coated with the secondactive material layer 22, and this will avoid waste in material and improve the energy density of the wound-type cell. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 2 andFIG. 3 , a side of the firstcurrent collector 11 which directly faces the blank secondcurrent collector 211 is not coated with the firstactive material layer 12. Because the blank secondcurrent collector 211 is not coated with the secondactive material layer 22, if the side of the firstcurrent collector 11 which directly faces the blank secondcurrent collector 211 is coated with the firstactive material layer 12, it is not only helpless to the capacity (lithium-ion cannot realize the reciprocating process of intercalation and deintercalation between the blank secondcurrent collector 211 and the firstcurrent collector 11 which directly faces the blank second current collector 211) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the side of the firstcurrent collector 11 which directly faces the blank secondcurrent collector 211 may be not coated with the firstactive material layer 12, and this will avoid waste in material and improve the energy density of the wound-type cell. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 2 andFIG. 3 , an inner side of an arc-shaped portion C of the secondcurrent collector 21 which directly faces thefirst end 111E of the blank firstcurrent collector 111 is not coated with the secondactive material layer 22. Because thefirst end 111E of the blank firstcurrent collector 111, which directly faces the inner side of the arc-shaped portion C of the secondcurrent collector 21, is not coated with the firstactive material layer 12, if the inner side of the arc-shaped portion C is coated with the secondactive material layer 22, it is not only helpless to the capacity (lithium-ion cannot realize the reciprocating process of intercalation and deintercalation between the inner side of the arc-shaped portion C of the secondcurrent collector 21 and thefirst end 111E of the blank first current collector 111) but also increases the thickness of the wound-type cell and reduces the energy density of the wound-type cell. Therefore, the inner side of the arc-shaped portion C may be not coated with the secondactive material layer 22, and this will avoid waste in material and improve the energy density of the wound-type cell. - Secondly, a winding mandrel according to a second aspect of the present disclosure will be described.
- Referring to
FIG. 2 , a winding mandrel according to a second aspect of the present disclosure is used for winding the wound-type cell according to the first aspect of the present disclosure, the winding mandrel comprises a first winding mandrel S1 and a second winding mandrel S2 which are sequentially provided along the length direction L, a first end surface S11 of the first winding mandrel S1 and a second end surface S21 of the second winding mandrel S2 face each other and form a clamping groove G; an end of the first end surface S11 which is close to the blank secondcurrent collector 211 is beyond an end of the first end surface S11 which is away from the blank secondcurrent collector 211 in the length direction L; correspondingly, an end of the second end surface S21 which is close to the blank secondcurrent collector 211 is beyond an end of the second end surface S21 which is away from the blank secondcurrent collector 211 in the length direction L. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 2 , the first end surface S11 and the second end surface S21 are parallel to each other. - In an embodiment of the wound-type cell according to the present disclosure, referring to
FIG. 2 , an angle between the first end surface S11 and a first side surface S12 of the first winding mandrel S1 which is close to the blank secondcurrent collector 211 is between 20 degrees and 70 degrees; correspondingly, an angle between the second end surface S21 and a second side surface S22 of the second winding mandrel S2 which is close to the blank secondcurrent collector 211 is between 160 degrees and 110 degrees.
Claims (17)
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Application Number | Priority Date | Filing Date | Title |
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US16/113,952 US10833371B2 (en) | 2016-03-31 | 2018-08-27 | Wound-type cell |
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Application Number | Priority Date | Filing Date | Title |
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CN201610195191.0A CN107293805B (en) | 2016-03-31 | 2016-03-31 | Winding type battery cell and winding needle |
CN201610195191.0 | 2016-03-31 |
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US16/113,952 Continuation US10833371B2 (en) | 2016-03-31 | 2018-08-27 | Wound-type cell |
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US15/457,778 Abandoned US20170288274A1 (en) | 2016-03-31 | 2017-03-13 | Wound-type cell and winding mandrel |
US16/113,952 Active US10833371B2 (en) | 2016-03-31 | 2018-08-27 | Wound-type cell |
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US16/113,952 Active US10833371B2 (en) | 2016-03-31 | 2018-08-27 | Wound-type cell |
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WO2024104105A1 (en) * | 2022-11-14 | 2024-05-23 | 惠州市豪鹏科技有限公司 | Electrode core and battery |
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CN110380108B (en) * | 2018-04-12 | 2021-10-08 | 宁德新能源科技有限公司 | Battery cell and electrochemical device with same |
CN111525194B (en) * | 2020-04-28 | 2022-05-20 | 宁德新能源科技有限公司 | Electrochemical device and electronic device including the same |
CN113097435A (en) * | 2021-03-31 | 2021-07-09 | 珠海冠宇电池股份有限公司 | Electrode plate and battery |
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- 2016-03-31 CN CN201610195191.0A patent/CN107293805B/en active Active
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2017
- 2017-03-13 US US15/457,778 patent/US20170288274A1/en not_active Abandoned
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CN107293805A (en) | 2017-10-24 |
US20190013550A1 (en) | 2019-01-10 |
US10833371B2 (en) | 2020-11-10 |
CN107293805B (en) | 2023-02-28 |
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