WO2017010042A1 - 捲回型電池 - Google Patents
捲回型電池 Download PDFInfo
- Publication number
- WO2017010042A1 WO2017010042A1 PCT/JP2016/002881 JP2016002881W WO2017010042A1 WO 2017010042 A1 WO2017010042 A1 WO 2017010042A1 JP 2016002881 W JP2016002881 W JP 2016002881W WO 2017010042 A1 WO2017010042 A1 WO 2017010042A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- electrode
- current collector
- collector sheet
- insulating layer
- active material
- Prior art date
Links
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
-
- 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
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
-
- 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
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
-
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/595—Tapes
-
- 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 invention relates to a wound battery, and more particularly to a wound battery including a battery case having a cylindrical portion having a small outer diameter.
- Patent Document 1 teaches a battery including a small cylindrical metal can and a sealing member that seals the opening.
- the metal can contains a wound electrode group.
- the electrode group includes first and second electrodes, and a separator is interposed between the electrodes.
- a separator protrudes from the end face of the electrode group to prevent contact between an electrode having a different polarity and a metal can, and a short circuit between the end of one electrode and the end of the other electrode.
- one aspect of the present disclosure includes a power generation element and a battery case that houses the power generation element.
- the battery case includes a metal cylindrical portion.
- the power generation element includes a first electrode and a battery case. , A second electrode having a polarity different from that of the first electrode, a separator interposed between the first electrode and the second electrode, and an electrolyte.
- the first electrode and the second electrode are wound through a separator to form an electrode group having a first end face and a second end face opposite to the first end face, and the first electrode includes a first current collector sheet and And a first active material layer formed on the surface of the first current collector sheet.
- a first current collector lead is electrically connected to the first current collector sheet, and a second electrode is formed on the surface of the second current collector sheet and the second current collector sheet. And a material layer.
- a second current collector lead is electrically connected to the second current collector sheet, and the first current collector sheet is first on both surfaces at the end portion disposed on the first end surface of the electrode group. It has the 1st uncoated part which does not have an active material layer.
- a first current collecting lead is connected to the first uncoated portion, the edge surface of the first uncoated portion is at least partially covered with an insulating layer, and the first end surface is more than the separator.
- the present invention relates to a wound battery in which an insulating layer protrudes.
- FIG. 1 is a diagram schematically illustrating a first electrode having a first uncoated portion to which a first current collecting lead is connected.
- FIG. 1 (a) is a diagram illustrating a first uncoated to which a first current collecting lead is connected.
- FIG. 5B is a plan view schematically showing a first electrode having a working part, and FIG. FIG.
- FIG. 2 is a diagram schematically showing a first electrode having a first uncoated portion to which a first current collecting lead is connected, and the first uncoated portion is covered with an insulating layer; a) A plan view schematically showing a first electrode having a first uncoated portion to which a first current collecting lead is connected and the first uncoated portion is covered with an insulating layer; Is a sectional view taken along line IIb-IIb.
- FIG. 3 is a diagram schematically illustrating a second electrode having a second uncoated portion to which a second current collecting lead is connected, and (a) is a diagram illustrating a second uncoated to which a second current collecting lead is connected.
- FIG. 2B is a plan view schematically showing a second electrode having a working part
- FIG. 3B is a sectional view taken along line IIIb-IIIb
- FIG. 4 is a plan view schematically showing the configuration of the electrode group before winding.
- FIG. 5 is a plan view schematically showing another configuration of the electrode group before winding.
- FIG. 6 is a longitudinal sectional view of a cylindrical wound battery according to an embodiment of the present invention.
- FIG. 7 is a longitudinal sectional view of a cylindrical wound battery according to another embodiment of the present invention.
- a wound battery according to the present disclosure includes a power generation element and a battery case that houses the power generation element.
- the power generation element includes a first electrode, a second electrode having a polarity different from the first electrode, A separator interposed between the first electrode and the second electrode; and an electrolyte.
- the first electrode and the second electrode are wound through a separator to form an electrode group having a first end face and a second end face opposite to the first end face.
- the first electrode includes a first current collector sheet and a first active material layer formed on the surface of the first current collector sheet.
- a first current collector lead is electrically connected to the first current collector sheet.
- the second electrode includes a second current collector sheet and a second active material layer formed on the surface of the second current collector sheet.
- a second current collector lead is electrically connected to the second current collector sheet.
- the first current collector sheet has a first uncoated portion that does not have the first active material layer on both surfaces at the end portion disposed on the first end surface of the electrode group.
- a first current collecting lead is connected to the first uncoated portion. This eliminates the need to provide an uncoated portion for connecting the first current collector lead at the end of the first current collector sheet in the direction perpendicular to the winding axis direction. Unnecessary increases can be avoided.
- the edge surface of the first uncoated portion (that is, the first current collector sheet) is at least partially covered with an insulating layer. Moreover, the insulating layer protrudes from the separator at the first end face. Accordingly, when the electrode group is pushed into the cylindrical portion of the battery case, when the jig is pressed against the first end surface, the jig is pressed against the insulating layer, not the end of the separator. For this reason, the first end face is not easily deformed.
- the effect of suppressing the deformation of the first end surface is to cover at least a part of the edge surface of the first uncoated portion with an insulating layer and to make the insulating layer protrude from the separator at the first end surface.
- at least one circumference of the electrode group or 50% or more of the circumference of the edge surface of the first uncoated portion is covered with the insulating layer. It is desirable.
- the edge surface of the first uncoated portion covered with the insulating layer may be the innermost circumference of the first electrode constituting the electrode group, or may be the outermost circumference. Any circumference is acceptable.
- the 1st current collection lead or the 2nd current collection lead can be connected to the cylindrical part of a battery case in the 1st end face side (for example, opening side in the case of inserting an electrode group in a metal can). Therefore, even when the outer diameter of the cylindrical portion is small, the connection can be easily performed.
- the first current collecting lead or the second current collecting lead is electrically connected to a connection position that does not face the electrode group on the inner surface of the cylindrical portion.
- the electrical connection is performed, for example, by resistance welding using a welding electrode. If the connection position does not face the electrode group, the welding operation between the lead and the cylindrical portion becomes easy.
- the insulating layer protrudes from the first end surface, even when the connection position between the lead and the cylindrical portion is close to the first end surface, the separator is unlikely to contact the welding electrode, and the welding electrode and the lead or cylindrical shape It is also possible to avoid biting the separator between the parts.
- the battery case includes, for example, a bottomed metal can having a cylindrical portion and a sealing member that closes the opening of the metal can.
- the first end face is disposed on the opening side.
- the first current collecting lead and the second current collecting lead are both protruded from the first end surface, and one of the first current collecting lead and the second current collecting lead is not opposed to the electrode group on the inner surface of the cylindrical portion. It is desirable to connect to the connection position and connect the other to the sealing member.
- the first electrode When the second current collecting lead is connected to the cylindrical portion, the first electrode has a polarity different from that of the metal can.
- the edge surface of the first uncoated portion of the first electrode is at least partially covered with the insulating layer and the insulating layer protrudes beyond the separator, the inner surface of the metal can and the first uncoated portion The contact of is suppressed.
- at least 30% of the edge surface of the first uncoated portion is covered with an insulating layer from the end surface of the end position at the outermost periphery. It is desirable that 100% of the edge surface is covered with an insulating layer.
- the shortest distance in the winding axis direction between the insulating layer and the connection position of the inner surface lead of the cylindrical portion is 0.3 mm or more and 3 mm or less. Therefore, it can avoid that the length of a cylindrical part becomes large, and it becomes advantageous to the high energy density of a battery. Further, it is possible to avoid an increase in the length of the lead, and to avoid an internal short circuit due to the positional deviation of the lead.
- the insulating layer is usually made of a material that is thicker than the separator and has high bending rigidity.
- the insulating layer desirably includes a non-porous sheet material that is not porous, for example.
- the separator is porous and has flexibility.
- the insulating tape includes an insulating sheet and an adhesive layer provided on one surface of the insulating sheet.
- a non-porous sheet material can be used for the insulating sheet.
- the root of the first current collecting lead (the vicinity of the end face of the first uncoated portion) is fixed by the insulating layer, and the movement of the first current collecting lead is suppressed.
- the first current collecting lead is restrained so as to face straight upward, and the risk of an internal short circuit due to the first current collecting lead is also reduced.
- the thickness of the insulating layer is preferably 15 ⁇ m or more and 50 ⁇ m or less, for example. If it is 15 ⁇ m or more, high insulation can be secured, and if it is 50 ⁇ m or less, even if the outer diameter of the electrode group is small, it is difficult to be affected by the strain due to the insulating layer, and the first electrode can be easily wound. it can. Usually, an insulating layer having a thickness larger than that of the separator is used.
- the insulating layer is provided along the entire length of the first electrode disposed on the first end surface, it is desirable that the insulating layer projects from the edge surface of the first uncoated portion along the entire length.
- a second uncoated portion having no second active material layer is formed on at least one surface. It is preferable. In this case, the second current collecting lead is connected to the second uncoated portion.
- the second uncoated portion is preferably provided in a strip shape along the one end portion. Thereby, it becomes easy to make the 2nd current collection lead extend toward the opening side from the 1st end face.
- the other end portion of the second current collector sheet in the direction perpendicular to the winding axis may be coincident with the end portion of the second active material layer, and the second current collector sheet is exposed.
- An uncoated portion may be provided. Such an uncoated part is also preferably provided in a strip shape along the other end part.
- both ends in the winding axis direction of the electrode group of the second current collector sheet coincide with both ends in the same direction of the second active material layer. That is, it is preferable that the second active material layer is formed on both surfaces of both ends in the winding axis direction.
- the opposing area of a 2nd active material layer and a 1st active material layer can be enlarged enough.
- the risk of the internal short circuit by the contact with a 2nd collector sheet and a 1st uncoated part can be reduced significantly.
- each edge part does not need to be covered with a 2nd active material layer over the full length. For example, 50% or more of the total length of each end portion only needs to be covered with the second active material layer.
- both ends in the direction perpendicular to the winding axis direction of the first current collector sheet coincide with both ends in the same direction of the first active material layer. That is, it is preferable that the first active material layer is formed on both surfaces of both end portions in the direction perpendicular to the winding axis direction. Thereby, the opposing area of a 1st active material layer and a 2nd active material layer can be enlarged enough. Again, it is not necessary to cover the edge surface of each end with the first active material layer. Further, it is sufficient that 50% or more of the total length of each end portion is covered with the first active material layer.
- the importance of suppressing the deformation of the first end face is particularly great when the outer diameter of the cylindrical portion of the battery case is 10 mm or less, further 6 mm or less, particularly 4.5 mm or less. This is because the smaller the outer diameter of the cylindrical portion (for example, the outer diameter of the cross section perpendicular to the axial direction of the metal can), the more difficult it is to push the electrode group into the battery case.
- the metal can is preferably made of stainless steel from the viewpoint of securing strength, and the can wall preferably has a thickness of 0.05 mm to 0.2 mm. Thereby, a small-sized, high-capacity and high-strength wound battery can be realized. In addition, it is difficult to make the outer diameter of a cylindrical metal can smaller than 1 mm, and it is preferable that an outer diameter is 1 mm or more.
- the winding axis direction of the electrode group is also referred to as “first direction”, and the direction perpendicular to the winding axis direction is also referred to as “second direction”.
- the positive electrode 4 includes a positive electrode current collector sheet 40 that is a first current collector sheet, and a positive electrode active material layer 41 formed on both surfaces of the positive electrode current collector sheet 40.
- the positive electrode current collector sheet 40 is rectangular, and in the case of the present embodiment, the long side direction (Y direction in FIG. 1) coincides with the winding axis direction (first direction).
- a first uncoated portion 40a from which the positive electrode current collector sheet 40 is exposed is provided at one end portion (hereinafter, referred to as a first end portion) in the first direction. The first end is disposed on the first end face side of the electrode group.
- the first uncoated portion 40a is provided in a strip shape along the first end portion.
- One end of a strip-like positive electrode current collector lead 24 is connected to the first uncoated part 40a by welding.
- the positive electrode current collector sheet is not exposed at the other end portion in the first direction of the positive electrode 4 (hereinafter referred to as the second end portion), and the positive electrode active material is entirely exposed on both surfaces except for the edge surface 40b of the second end portion.
- a material layer 41 is formed.
- both ends of the positive electrode current collector sheet 40 in the second direction (X direction in FIG. 1) are both positive electrode active material layers except for the edge surfaces and portions corresponding to the first uncoated portions. 41.
- the positive electrode having such a structure is formed by applying a raw material mixture of the positive electrode active material layer 41 to a raw material sheet of a large-sized positive electrode current collector sheet 40 in a stripe shape, and then forming an electrode plate original fabric. Can be easily manufactured by cutting into a predetermined shape.
- the “edge surface” corresponds to a cross section in the thickness direction formed when the current collector sheet is cut.
- the width W 10 in the first direction of the positive electrode current collector sheet 40 may be selected according to the length of the metal can or the battery capacity.
- the width W 11 of the first uncoated portion 40a is preferably 2 mm to 4 mm. If the width W 11 is in the above range, the formation area of the positive electrode active material layer 41 occupying the surface of the positive electrode current collector sheet 40 can be sufficiently large, and the strength of the joint portion with the positive electrode current collector lead 24 can be ensured. Cheap.
- FIG. 2 schematically shows a state where the first uncoated portion 40a of the positive electrode current collector sheet 40 is covered with the insulating layer 5 from both the front and back surfaces.
- the insulating layer 5 is provided in a strip shape along the first end portion so that the edge surface 40c of the first end portion (first uncoated portion 40a) is covered.
- the edge surface 40c When the edge surface 40c is covered with the insulating layer 5, the insulating layer 5 slightly protrudes from the edge surface 40c of the first uncoated portion 40a. Thereby, the risk of an internal short circuit due to the presence of the first uncoated portion 40a is greatly reduced. Further, the overlapping portion between the positive electrode current collector lead 24 and the first uncoated portion 40 a is covered with the insulating layer 5, and the base of the positive electrode current collector lead 24 is fixed with the insulating layer 5. Therefore, the movement of the positive electrode current collecting lead 24 is suppressed, and the risk of an internal short circuit caused by the positive electrode current collecting lead 24 is also reduced.
- the overhang width W 12 from the edge surface 40c of the first uncoated portion 40a of the insulating layer 5 is preferably 0.1 mm to 1 mm, and more preferably 0.4 mm to 0.6 mm.
- the first uncoated portion 40 a is not completely covered with the insulating layer 5, but 90% or more of the total area of both surfaces of the first uncoated portion 40 a is the insulating layer 5. It is preferable that the first uncoated portion 40a is completely covered with the insulating layer 5.
- the insulating layer 5 may be formed of an insulating material.
- an adhesive containing an insulating resin component is preferable.
- a rubber adhesive, an acrylic adhesive, a silicone adhesive, a urethane adhesive, or the like can be used.
- the pressure-sensitive adhesive contains a tackifier, a crosslinking agent, a softening agent, an anti-aging agent, and the like as necessary.
- the rubber-based adhesive includes rubber components such as natural rubber, butyl rubber, and isoprene rubber.
- the acrylic pressure-sensitive adhesive contains a polymer of acrylic monomers such as acrylonitrile, (meth) acrylic acid, (meth) acrylic acid ester.
- the silicone pressure-sensitive adhesive contains polysiloxane or silicone rubber.
- an insulating tape may be used as the insulating layer 5. If an insulating tape is used, the operation
- the insulating tape includes an insulating sheet (base film) and an adhesive layer provided on one surface of the insulating sheet.
- the pressure-sensitive adhesive layer contains the above pressure-sensitive adhesive.
- a film of polyolefin or engineering plastic such as a polypropylene film, a polyethylene terephthalate film, a polyimide film, or a polyphenylene sulfide (PPS) film can be used.
- a non-porous polypropylene film having a thickness of 15 ⁇ m to 50 ⁇ m because the influence of strain on the electrode group is small.
- the thickness of the insulating layer 5 is preferably equal to or less than the thickness of the positive electrode active material layer, and more preferably 20% to 50% of the thickness of the positive electrode active material layer. By providing the insulating layer 5 having such a thickness in the first uncoated portion, even when an electrode group having a small diameter is formed, the insulating layer 5 is not easily affected by the distortion, and the internal pressure of the electrode group is locally affected. Changes are suppressed.
- the thickness of the insulating layer 5 is preferably 15 ⁇ m to 50 ⁇ m, more preferably 20 ⁇ m to 40 ⁇ m.
- the positive electrode current collector sheet 40 is a porous or non-porous conductive substrate.
- the material of the positive electrode current collector sheet 40 is preferably a metal foil such as aluminum or aluminum alloy.
- the thickness of the positive electrode current collector sheet is not particularly limited, but is preferably 10 ⁇ m to 20 ⁇ m.
- the positive electrode active material layer 41 includes a positive electrode active material as an essential component, and includes a binder, a conductive agent, and the like as optional components.
- a positive electrode active material of the lithium ion secondary battery a lithium-containing composite oxide is preferable, and for example, LiCoO 2 , LiNiO 2 , LiMn 2 O 4 and the like are used.
- the positive electrode active material of the lithium ion primary battery manganese dioxide, graphite fluoride, or the like is used.
- a positive electrode mixture containing a positive electrode active material is mixed with a liquid component to prepare a positive electrode slurry.
- the positive electrode slurry is applied to the surface of the positive electrode current collector sheet, and the coating film is dried.
- the dried coating film is rolled together with the positive electrode current collector sheet to form a positive electrode active material layer having a predetermined thickness.
- the thickness of the positive electrode active material layer is not particularly limited, but is preferably 70 ⁇ m to 130 ⁇ m.
- the material of the positive electrode current collecting lead 24 of the lithium ion battery for example, aluminum, aluminum alloy, nickel, nickel alloy, iron, stainless steel or the like is preferably used.
- the thickness of the positive electrode current collector lead 24 is preferably 10 ⁇ m to 120 ⁇ m, and more preferably 20 ⁇ m to 80 ⁇ m.
- the shape of the positive electrode current collector lead 24 is not particularly limited, but is, for example, a strip shape having a width of 0.5 mm to 3 mm and a length of 3 mm to 10 mm.
- the negative electrode 2 includes a negative electrode current collector sheet 20 that is a second current collector sheet, and a negative electrode active material layer 21 formed on both surfaces of the negative electrode current collector sheet 20.
- the negative electrode current collector sheet 20 is a rectangle in which the length in the second direction is set larger than that of the positive electrode current collector sheet 40.
- a second uncoated portion (A) in which the negative electrode current collector sheet is exposed at one end (hereinafter referred to as a first end) in the second direction (X direction in FIG. 3) of the negative electrode current collector sheet 20. 20a is provided relatively wide.
- the second uncoated portion (A) 20a is provided in a strip shape along the first end portion.
- One end of a strip-shaped negative electrode current collector lead 22 is connected to the second uncoated part (A) 20a by welding.
- a second uncoated portion (B) 20b in which the negative electrode current collector sheet 20 is exposed is also provided in a strip shape at the other end portion (hereinafter referred to as a second end portion) in the second direction of the negative electrode current collector sheet 20. It has been. Such an exposed portion of the negative electrode current collector sheet 20 is provided to suppress peeling of the negative electrode active material layer.
- Both ends of the negative electrode current collector sheet 20 in the first direction are negative electrode active except for the portions corresponding to the edge surfaces 20c and 20d and the second uncoated portions 20a and 20b at the respective ends.
- the material layer 21 is covered. Thereby, while the opposing area of the positive electrode active material layer 41 and the negative electrode active material layer 21 can be enlarged enough, the risk of the internal short circuit by the contact with the 1st uncoated part 40a and the negative electrode collector sheet 20 is possible. Can be greatly reduced.
- the width W 21 of the second uncoated portion (A) 20a is preferably 10% to 50% of the width W 20 of the negative electrode current collector sheet 20 in the second direction. If the width W 21 is in the above range, the formation area of the negative electrode active material layer 21 occupying the surface of the negative electrode current collector sheet 20 can be secured sufficiently large, and the strength of the joint portion with the negative electrode current collector lead 22 can be secured. Cheap.
- the width W 22 of the second uncoated portion (B) 20b may be 1% to 10% of the width W 20 .
- the 2nd uncoated part (B) 20b does not need to exist.
- a negative electrode active material layer may be formed on at least a part of the back surfaces of the second uncoated portions 20a and 20b. Alternatively, the back surfaces of the second uncoated portions 20a and 20b may be uncoated portions where the negative electrode current collector sheet is exposed, similarly to the front surface.
- the negative electrode current collector sheet 20 is a porous or non-porous conductive substrate.
- a metal foil such as stainless steel, nickel, copper, copper alloy, and aluminum is preferably used as the material of the negative electrode current collector sheet.
- the thickness of the negative electrode current collector sheet is not particularly limited, but is preferably 5 ⁇ m to 20 ⁇ m.
- the negative electrode active material layer 21 includes a negative electrode active material as an essential component, and includes a binder, a conductive agent, and the like as optional components.
- metallic lithium such as a silicon alloy or a tin alloy
- a carbon material such as graphite or hard carbon
- a silicon compound such as a tin compound, or a lithium titanate compound is used.
- a negative electrode mixture containing a negative electrode active material is mixed with a liquid component to prepare a negative electrode slurry. Next, the negative electrode slurry is applied to the surface of the negative electrode current collector sheet, and the coating film is dried.
- the dried coating film is rolled together with the negative electrode current collector sheet to form a negative electrode active material layer having a predetermined thickness.
- the thickness of the negative electrode active material layer is not particularly limited, but is preferably 70 ⁇ m to 150 ⁇ m. Note that when the negative electrode active material is an alloy or a compound, the active material layer may be formed by a vacuum process.
- nickel, nickel alloy, iron, stainless steel, copper, copper alloy or the like is preferably used as the material of the negative electrode current collecting lead 22 of the lithium ion battery.
- the thickness of the negative electrode current collector lead 22 is preferably 10 ⁇ m to 120 ⁇ m, and more preferably 20 ⁇ m to 80 ⁇ m.
- the shape of the negative electrode current collector lead 22 is not particularly limited, but is, for example, a strip shape having a width of 0.5 mm to 3 mm and a length of 9 mm to 15 mm.
- binder examples include fluorine resin (polyvinylidene fluoride, polytetrafluoroethylene, etc.), polyamide, polyimide, polyamideimide, polyacrylic acid, styrene butadiene rubber, and the like. Is mentioned.
- electrically conductive agent which can be used for a positive electrode active material layer and / or a negative electrode active material layer, graphite, carbon black, carbon fiber etc. are mentioned, for example.
- FIG. 3 schematically shows a state in which the negative electrode current collecting lead 22 is connected to the second uncoated portion (A) 20a and the insulating tape 54 for fixing is attached.
- the fixing insulating tape 54 fixes the outermost periphery of the electrode group after winding, but also partially covers the overlapping portion of the negative electrode current collector lead 22 and the second uncoated portion (A) 20a. ing. Thereby, it becomes easy to ensure the strength of the connection portion between the negative electrode current collector lead 22 and the negative electrode current collector sheet 20.
- FIG. 4 is a plan view schematically showing the configuration of the electrode group before winding.
- the positive electrode 4 is disposed on the left side and the back side of the separator 6, and the negative electrode 2 is disposed on the right side and the surface side of the separator 6.
- the width W 13 of the positive electrode active material layer 41 in the winding axis direction (first direction) is slightly smaller than the width W 23 of the negative electrode active material layer 21 in the first direction, so that the positive electrode active material layer 41 is completely negative electrode active material.
- the positive electrode 4 and the negative electrode 2 are laminated so as to overlap with the layer 21. Such a laminate of the positive electrode 4, the separator 6 and the negative electrode 2 is wound around the core 50 to form an electrode group.
- the insulating layer 5 covering the first uncoated portion 40a of the positive electrode 4 protrudes from one end portion (first end face side) of the separator 6 in the first direction.
- the other end of the separator 6 in the first direction protrudes beyond the end of the positive electrode 4.
- both end portions in the first direction of the separator 6 protrude from both end portions in the first direction of the negative electrode 2.
- the insulating layer 5 can be protruded from the first end face of the electrode group, and the risk of an internal short circuit is also reduced.
- the edge surface 40 c of the first uncoated part 40 a protrudes from the edge surface 20 c of the negative electrode current collector sheet 20. Thereby, the connection area
- Projecting width W 14 of the separator 6 of the insulating layer 5 at the first end face is not particularly limited, slightly insulating layer 5 than the separator 6 it is sufficient to project.
- protrusion width W 14 for example it is desirably 0.1mm or more, and more preferably is 0.2mm or more.
- the position of the edge surface 20 c of the negative electrode current collector sheet is opposed to the insulating layer 5 covering the first uncoated portion 40 a of the positive electrode 4 with the separator 6 interposed therebetween. Therefore, even if the separator 6 is misaligned, the edge surface 20c of the negative electrode current collector sheet is avoided from coming into contact with the first uncoated portion 40a, and the risk of an internal short circuit is greatly reduced.
- edge surface 40c of the 1st uncoated part 40a protrudes rather than the edge part of the separator 6
- positional relationship is not limited to this.
- the edge part of the separator 6 may protrude rather than the edge surface 40c of the 1st uncoated part 40a.
- the edge surface 40 c of the first uncoated portion 40 a faces the separator 6. Thus, the risk of internal short circuit is still kept low.
- the overhanging portion faces the inner surface of the cylindrical portion or the side wall of the metal can.
- FIG. 6 is a longitudinal sectional view of a cylindrical wound battery according to an embodiment of the present invention.
- the power generating element of the wound battery includes a positive electrode 4 as a first electrode, a negative electrode 2 as a second electrode, a separator 6 interposed between the first electrode and the second electrode, and an electrolyte (not shown). It consists of and.
- the positive electrode 4 and the negative electrode 2 are wound through a separator 6 to form a wound electrode group.
- the battery case includes a bottomed cylindrical metal can 8 and a sealing member 12 that seals the opening of the metal can 8.
- the winding axis of the electrode group coincides with the central axis of the metal can 8, and the vicinity of the winding axis is a hollow portion 18 (diameter R) where no power generation element exists.
- the core 50 is preferably selected so that the diameter of the hollow part of the electrode group is 3 mm or less, preferably less than 1.5 mm. The core may be left in the battery without being removed.
- the core 50 After winding the laminated body to form the electrode group, the core 50 is extracted. Therefore, a hollow having a diameter R is formed at the center of the electrode group. Thereafter, the electrode group is stored in the metal can 8. At this time, the electrode group is inserted into the metal can 8 from the second end face side, and the first end face from which the negative electrode current collecting lead 22 and the positive electrode current collecting lead 24 protrude is disposed on the opening side of the metal can 8. The electrode group is pushed into the metal can 8 by a pin-shaped jig until the second end surface reaches the bottom of the metal can 8. Meanwhile, the top of the jig is pressed against the first end face of the electrode group. At this time, since the insulating layer 5 protrudes from the first end face, deformation of the first end face is avoided or suppressed.
- One end of the negative electrode current collector lead 22 is electrically connected to the exposed portion (second uncoated portion (A) 20a) of the negative electrode current collector sheet of the negative electrode 2.
- the other end of the negative electrode current collector lead 22 extends to the opening side of the metal can 8 and is connected to a connection position 26 on the inner surface of the side wall (tubular portion) near the opening of the metal can 8. That is, the metal can 8 also serves as the negative electrode terminal 10.
- the connection between the negative electrode current collector lead 22 and the connection position 26 is performed by spot welding, for example.
- the shortest distance D in the winding axis direction between the insulating layer 5 and the connection position (welding point) 26 is preferably set to 0.3 mm to 3 mm, and preferably set to 0.5 mm to 1.5 mm. More preferably.
- an insulating ring-shaped intermediate member 28 is disposed on the first end face of the electrode group, and one end of the positive electrode current collecting lead 24 extending from the first uncoated portion 40a disposed on the first end face is And it connects to the lower surface of the sealing member 12 which has electroconductivity by welding. That is, the sealing member 12 also serves as the positive electrode terminal 14.
- an electrolyte is injected into the metal can 8 by a reduced pressure method.
- the cylindrical wound battery is obtained by crimping the opening end of the metal can 8 to the sealing member 12 via the insulating member (gasket) 16.
- An insulating ring member 30 is disposed on the periphery of the sealing member 12 to ensure insulation between the metal can 8 and the sealing member 12.
- the first uncoated portion 40a is entirely covered with the insulating layer 5 including the edge surface, but the relationship between the first uncoated portion 40a and the insulating layer 5 is not limited thereto.
- only a part of the first uncoated portion 40 a may be covered with the insulating layer 5.
- what is necessary is just to make the separator 6 protrude in the 1st end surface side rather than the part which is not coat
- an insulating microporous thin film, a woven fabric or a non-woven fabric is used as the separator 6 interposed between the positive electrode 4 and the negative electrode 2.
- a material for the separator of the lithium ion battery for example, polyolefin such as polypropylene and polyethylene is preferably used. This is because polyolefin is excellent in durability and has a shutdown function.
- the thickness of the separator 6 is, for example, 10 ⁇ m to 50 ⁇ m, preferably 10 ⁇ m to 30 ⁇ m, and more preferably 10 ⁇ m or more and less than 20 ⁇ m.
- the microporous thin film may be a single layer film or a multilayer film.
- the separator has a porosity of preferably 30% to 70%, more preferably 35% to 60%.
- Nonaqueous electrolyte The non-aqueous electrolyte may be in a liquid, gel, or solid state.
- a liquid non-aqueous electrolyte used for a lithium ion battery is usually composed of a lithium salt and a non-aqueous solvent in which the lithium salt is dissolved.
- strand-shaped carbonate ester, cyclic carboxylic acid ester etc. are used.
- the cyclic carbonate include propylene carbonate and ethylene carbonate.
- the chain carbonate include diethyl carbonate, ethyl methyl carbonate, and dimethyl carbonate.
- Examples of the cyclic carboxylic acid ester include ⁇ -butyric lactone and ⁇ -valerolactone.
- As the lithium salt for example, LiPF 6 or LiBF 4 is used.
- the above embodiment is merely an example of the present invention, and the present invention is not limited to the above embodiment.
- the present invention is preferably applied to various nonaqueous electrolyte batteries represented by lithium ion batteries.
- the battery may be a primary battery or a secondary battery.
- the shape of the battery may be cylindrical, and may be cylindrical or elliptical.
- the size of the battery is not limited. However, the technical significance of applying the present invention increases when the cylindrical portion of the battery case has an outer diameter of 10 mm or less, further 6 mm or less, and particularly 4.5 mm or less.
- the present invention can be applied to a wound battery, and is particularly useful when manufacturing a small-sized and high-capacity cylindrical wound battery.
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Abstract
Description
図1に示すように、正極4は、第1集電体シートである正極集電体シート40と、正極集電体シート40の両面に形成された正極活物質層41とを具備する。正極集電体シート40は矩形であり、本実施形態の場合、長辺方向(図1のY方向)が捲回軸方向(第1方向)に一致する。第1方向おける一端部(以下、第1端部)には、正極集電体シート40が露出している第1未塗工部40aが設けられている。第1端部は、電極群の第1端面側に配される。第1未塗工部40aは、第1端部に沿って帯状に設けられている。第1未塗工部40aには、短冊状の正極集電リード24の一端部が溶接により接続されている。
図3に示すように、負極2は、第2集電体シートである負極集電体シート20と、負極集電体シート20の両面に形成された負極活物質層21とを具備する。負極集電体シート20は、第2方向の長さが正極集電体シート40よりも大きく設定された矩形である。負極集電体シート20の第2方向(図3のX方向)における一端部(以下、第1端部)には、負極集電体シートが露出している第2未塗工部(A)20aが比較的幅広に設けられている。第2未塗工部(A)20aは、当該第1端部に沿って帯状に設けられる。第2未塗工部(A)20aには、短冊状の負極集電リード22の一端部が溶接により接続されている。
正極4と負極2との間に介在されるセパレータ6としては、絶縁性の微多孔薄膜、織布または不織布が用いられる。リチウムイオン電池のセパレータの材料としては、例えばポリプロピレン、ポリエチレンなどのポリオレフィンを用いることが好ましい。ポリオレフィンは耐久性に優れ、かつシャットダウン機能を有するためである。セパレータ6の厚さは、例えば10μm~50μmであり、10μm~30μmが好ましく、10μm以上、20μm未満がより好ましい。微多孔薄膜は、単層膜でもよく、多層膜でもよい。セパレータの空孔率は、30%~70%が好ましく、35%~60%が更に好ましい。
非水電解質は、液体、ゲルまたは固体のいずれの状態でもよい。リチウムイオン電池に用いる液体の非水電解質は、通常、リチウム塩と、リチウム塩を溶解させる非水溶媒とで構成される。非水溶媒としては、特に限定されないが、環状炭酸エステル、鎖状炭酸エステル、環状カルボン酸エステルなどが用いられる。環状炭酸エステルとしては、プロピレンカーボネート、エチレンカーボネートなどが挙げられる。鎖状炭酸エステルとしては、ジエチルカーボネート、エチルメチルカーボネート、ジメチルカーボネートなどが挙げられる。環状カルボン酸エステルとしては、γ-ブチ口ラクトン、γ-バレロラクトンなどが挙げられる。リチウム塩としては、例えばLiPF6、LiBF4などが用いられる。
4 正極(第1電極)
5 絶縁層
6 セパレータ
8 金属缶
10 負極端子
12 封口部材
14 正極端子
16 絶縁部材
18 中空部分
20 負極集電体シート(第2集電体シート)
20a 第2未塗工部(A)
20b 第2未塗工部(B)
21 負極活物質層
22 負極集電リード(第2集電リード)
24 正極集電リード(第1集電リード)
26 接続位置(溶接点)
28 中間部材
30 リング部材
40 正極集電体シート(第1集電体シート)
41 正極活物質層
40a 第1未塗工部
50 巻芯
54 固定用絶縁テープ
Claims (9)
- 発電要素と、
前記発電要素を収容する電池ケースと、を具備し、
前記電池ケースは、金属製の筒状部を有し、
前記発電要素は、第1電極と、前記第1電極とは極性が異なる第2電極と、前記第1電極と前記第2電極との間に介在するセパレータと、電解質と、を具備し、前記第1電極と前記第2電極とが前記セパレータを介して捲回されて第1端面およびその反対側の第2端面を有する電極群を形成しており、
前記第1電極は、第1集電体シートと、前記第1集電体シートの表面に形成された第1活物質層と、を具備し、前記第1集電体シートに、第1集電リードが電気的に接続されており、
前記第2電極は、第2集電体シートと、前記第2集電体シートの表面に形成された第2活物質層と、を具備し、前記第2集電体シートに、第2集電リードが電気的に接続されており、
前記第1集電体シートは、前記電極群の前記第1端面に配される端部に、両方の表面に前記第1活物質層を有さない第1未塗工部を有し、
前記第1未塗工部に、前記第1集電リードが接続されており、
前記第1未塗工部のエッジ面が、少なくとも部分的に絶縁層で被覆されており、
前記第1端面において、前記セパレータよりも前記絶縁層が突出している、捲回型電池。 - 前記第1未塗工部の前記エッジ面のうち、少なくとも前記電極群の一周分の50%以上が、前記絶縁層で被覆されている、請求項1に記載の捲回型電池。
- 前記第1集電リードおよび前記第2集電リードの少なくとも一方は、前記第1端面から突出して延在している、請求項1または2に記載の捲回型電池。
- 前記第1集電リードまたは前記第2集電リードは、前記筒状部の内面の前記電極群と対向しない接続位置に溶接されている、請求項1~3のいずれか1項に記載の捲回型電池。
- 前記絶縁層と、前記接続位置との、前記捲回軸方向における最短距離が、0.3mm以上、3mm以下である、請求項4に記載の捲回型電池。
- 前記絶縁層が、一対の絶縁テープを具備し、
前記一対の絶縁テープが、前記第1未塗工部を、両側から挟み込むことで、前記第1未塗工部の前記エッジ面が前記絶縁層で覆われている、請求項1~5のいずれか1項に記載の捲回型電池。 - 前記絶縁層の厚さが、15μm以上、50μm以下である、請求項6に記載の捲回型電池。
- 前記筒状部の外径が、10mm以下である、請求項1~7のいずれか1項に記載の捲回型電池。
- 前記電池ケースは、前記筒状部を有する有底の金属缶と、前記金属缶の開口を塞ぐ封口部材と、を具備し、前記第1端面は、前記開口側に配置されている、請求項1~8のいずれか1項に記載の捲回型電池。
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US15/573,571 US10566598B2 (en) | 2015-07-10 | 2016-06-15 | Battery having separator protection provided to electrode |
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---|---|---|---|---|
JP2019121500A (ja) * | 2017-12-28 | 2019-07-22 | パナソニックIpマネジメント株式会社 | 円筒形二次電池 |
CN113299920A (zh) * | 2021-05-24 | 2021-08-24 | 合肥国轩高科动力能源有限公司 | 一种锂电池卷芯 |
WO2023140142A1 (ja) * | 2022-01-21 | 2023-07-27 | パナソニックエナジー株式会社 | 円筒形二次電池 |
WO2023145679A1 (ja) * | 2022-01-28 | 2023-08-03 | パナソニックエナジー株式会社 | 非水電解質二次電池 |
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010073653A (ja) * | 2008-09-22 | 2010-04-02 | Panasonic Corp | 電池 |
JP2011216403A (ja) * | 2010-04-01 | 2011-10-27 | Hitachi Vehicle Energy Ltd | 角形リチウムイオン二次電池 |
JP2012204179A (ja) * | 2011-03-25 | 2012-10-22 | Toyota Motor Corp | 非水電解液二次電池 |
JP2015060787A (ja) * | 2013-09-20 | 2015-03-30 | 三菱自動車工業株式会社 | 二次電池 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2005019312A (ja) * | 2003-06-27 | 2005-01-20 | Matsushita Electric Ind Co Ltd | 非水電解質二次電池用電極および非水電解質二次電池 |
JP5241287B2 (ja) * | 2008-03-31 | 2013-07-17 | 三洋電機株式会社 | 二次電池 |
KR101009517B1 (ko) * | 2008-06-23 | 2011-01-18 | 삼성에스디아이 주식회사 | 전극 조립체와 이를 이용한 리튬 이차 전지 |
CN101807725A (zh) | 2009-02-18 | 2010-08-18 | 东莞新能源科技有限公司 | 锂离子电池 |
KR20130125819A (ko) | 2011-02-16 | 2013-11-19 | 파나소닉 주식회사 | 전지 및 전지의 제조 방법 |
US11476494B2 (en) * | 2013-08-16 | 2022-10-18 | Zenlabs Energy, Inc. | Lithium ion batteries with high capacity anode active material and good cycling for consumer electronics |
-
2016
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2010073653A (ja) * | 2008-09-22 | 2010-04-02 | Panasonic Corp | 電池 |
JP2011216403A (ja) * | 2010-04-01 | 2011-10-27 | Hitachi Vehicle Energy Ltd | 角形リチウムイオン二次電池 |
JP2012204179A (ja) * | 2011-03-25 | 2012-10-22 | Toyota Motor Corp | 非水電解液二次電池 |
JP2015060787A (ja) * | 2013-09-20 | 2015-03-30 | 三菱自動車工業株式会社 | 二次電池 |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019121500A (ja) * | 2017-12-28 | 2019-07-22 | パナソニックIpマネジメント株式会社 | 円筒形二次電池 |
CN113299920A (zh) * | 2021-05-24 | 2021-08-24 | 合肥国轩高科动力能源有限公司 | 一种锂电池卷芯 |
CN113299920B (zh) * | 2021-05-24 | 2022-05-03 | 合肥国轩高科动力能源有限公司 | 一种锂电池卷芯 |
WO2023140142A1 (ja) * | 2022-01-21 | 2023-07-27 | パナソニックエナジー株式会社 | 円筒形二次電池 |
WO2023145679A1 (ja) * | 2022-01-28 | 2023-08-03 | パナソニックエナジー株式会社 | 非水電解質二次電池 |
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