WO2017208683A1 - Batterie secondaire - Google Patents

Batterie secondaire Download PDF

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Publication number
WO2017208683A1
WO2017208683A1 PCT/JP2017/016339 JP2017016339W WO2017208683A1 WO 2017208683 A1 WO2017208683 A1 WO 2017208683A1 JP 2017016339 W JP2017016339 W JP 2017016339W WO 2017208683 A1 WO2017208683 A1 WO 2017208683A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
curved surface
curved
positive electrode
negative electrode
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PCT/JP2017/016339
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English (en)
Japanese (ja)
Inventor
徹 川合
大塚　正博
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株式会社村田製作所
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Publication of WO2017208683A1 publication Critical patent/WO2017208683A1/fr

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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
    • 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
    • H01M4/131—Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
    • 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
    • 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
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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 secondary battery.
  • Secondary batteries that can be repeatedly charged and discharged have been used for various purposes.
  • the secondary battery is used as a power source for electronic devices such as smartphones and notebook computers.
  • Patent Document 1 discloses a secondary battery provided with a recessed region having a bent shape.
  • the shape of the electronic medium connected to the secondary battery may include a curved shape depending on the application.
  • the curved electronic medium is preferably fitted into the recessed area of the secondary battery due to the difference in shape. It becomes difficult to provide. For this reason, it does not suitably meet the requirements for efficient installation of the electronic medium for the secondary battery in the electronic device.
  • An object of the present invention is to provide a secondary battery that enables an efficient installation of an electronic medium including a curved shape.
  • An electrode assembly including a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode, and an electrolyte, and a secondary battery in which an electrolyte is housed
  • the secondary battery has a corner region, A concave surface recessed inward in the corner region is formed, and a curved surface is formed on at least a part of the concave surface, The bending angle of the curved surface is not less than 15 ° and not more than 270 ° with respect to the center of curvature (the center of curvature is one end of the curved surface, the other end of the curved surface, and the midpoint between one end and the other end of the curved surface) And a concave surface including at least a part of the curved surface in a plan view or a cross-sectional view is a surface for placing an electronic medium including a curved shape.
  • a secondary battery is provided.
  • the secondary battery according to an embodiment of the present invention enables efficient installation of an electronic medium including a curved shape.
  • FIG. 1 is a schematic view of a secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic view of a secondary battery having a curved surface with a bending angle of 15 °.
  • FIG. 3 is a schematic view of a secondary battery having a curved surface with a bending angle of 30 °.
  • FIG. 4 is a schematic view of a secondary battery having a curved surface with a bending angle of 90 °.
  • FIG. 5 is a schematic view of a secondary battery having a curved surface with a bending angle of 180 °.
  • FIG. 6 is a schematic view of a secondary battery having a curved surface with a bending angle of 270 °.
  • FIG. 1 is a schematic view of a secondary battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic view of a secondary battery having a curved surface with a bending angle of 15 °.
  • FIG. 3 is a schematic view of a secondary battery
  • FIG. 7 is a schematic view of a secondary battery in which a curved surface is formed on a part of the concave surface.
  • FIG. 8 is a schematic view showing a state in which the secondary batteries are arranged so as to contact each other with the curved surfaces facing each other.
  • FIG. 9 shows a schematic diagram illustrating the concept of the curvature center point.
  • the term “secondary battery” refers to a battery that can be repeatedly charged and discharged.
  • the “secondary battery” is not excessively bound by the name, and may include, for example, “electric storage device”.
  • the term “plan view” as used herein refers to a state when an object (for example, a secondary battery) is placed in a broad sense and viewed from above or below along its thickness (height) direction. That is the same as the plan view.
  • the “plan view” is a state when the object is viewed from the upper side or the lower side along the thickness direction based on the stacking direction of the electrode materials constituting the secondary battery in a narrow sense.
  • side view refers to a state in which an object (for example, a secondary battery) is placed and viewed from a direction substantially perpendicular to the thickness (height) direction. It is a state and is a side view and agreement.
  • side view refers to a state when viewed from a direction substantially perpendicular to the thickness direction based on the stacking direction of the electrode materials constituting the secondary battery.
  • a secondary battery according to an embodiment of the present invention has a structure in which an electrode assembly and an electrolyte are accommodated and enclosed in an exterior body.
  • the electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between the positive electrode and the negative electrode.
  • a spacer is provided in the exterior body in order to prevent electronic contact between the positive and negative electrodes and the exterior body.
  • the positive electrode is electronically connected to the positive electrode external terminal via the positive electrode current collecting lead.
  • the external terminal for positive electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the negative electrode is electronically connected to the negative electrode external terminal via the negative electrode current collecting lead.
  • the external terminal for negative electrode is fixed to the exterior body by a seal portion, and the seal portion prevents electrolyte leakage.
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector, and the positive electrode material layer is provided on at least one surface of the positive electrode current collector.
  • the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector, and the negative electrode material layer is provided on at least one surface of the negative electrode current collector.
  • the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • the positive electrode active material included in the positive electrode material layer and the negative electrode active material included in the negative electrode material layer are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes that are responsible for charge / discharge, that is, the battery reaction. is there. More specifically, ions are brought into the electrolyte due to the “positive electrode active material included in the positive electrode material layer” and the “negative electrode active material included in the negative electrode material layer”, and the ions are interposed between the positive electrode and the negative electrode. Then, the electrons are transferred and the electrons are delivered and charged and discharged.
  • the positive electrode material layer and the negative electrode material layer are particularly preferably layers capable of occluding and releasing lithium ions.
  • the secondary battery according to this embodiment corresponds to a so-called “lithium ion battery”.
  • the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and a binder (also referred to as a “binder”) is included in the positive electrode material layer for sufficient contact between the particles and shape retention. preferable. Furthermore, a conductive additive may be included in the positive electrode material layer in order to facilitate the transmission of electrons that promote the battery reaction.
  • the negative electrode active material of the negative electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included for sufficient contact and shape retention between the particles, facilitating the transfer of electrons that promote the battery reaction. Therefore, a conductive additive may be included in the negative electrode material layer.
  • the positive electrode material layer and the negative electrode material layer can also be referred to as “positive electrode composite material layer” and “negative electrode composite material layer”, respectively.
  • the positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions.
  • the positive electrode active material is preferably, for example, a lithium-containing composite oxide.
  • the positive electrode active material is preferably a lithium transition metal composite oxide containing lithium and at least one transition metal selected from the group consisting of cobalt, nickel, manganese, and iron. That is, such a lithium transition metal composite oxide is preferably included as the positive electrode active material in the positive electrode material layer of the secondary battery.
  • the positive electrode active material may be lithium cobaltate, lithium nickelate, lithium manganate, lithium iron phosphate, or a part of those transition metals replaced with another metal.
  • the positive electrode active material contained in the positive electrode material layer is lithium cobalt oxide.
  • the binder that can be included in the positive electrode material layer is not particularly limited, but includes polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene copolymer, and Mention may be made of at least one selected from the group consisting of polytetrafluoroethylene and the like.
  • the conductive additive that can be contained in the positive electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • the binder of the positive electrode material layer is polyvinylidene fluoride
  • the conductive additive of the positive electrode material layer is carbon black.
  • the binder and conductive additive of the positive electrode material layer are a combination of polyvinylidene fluoride and carbon black.
  • the negative electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the negative electrode active material is preferably, for example, various carbon materials, oxides, or lithium alloys.
  • Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), soft carbon, hard carbon, diamond-like carbon, and the like.
  • graphite is preferable in that it has high electron conductivity and excellent adhesion to the negative electrode current collector.
  • Examples of the oxide of the negative electrode active material include at least one selected from the group consisting of silicon oxide, tin oxide, indium oxide, zinc oxide, lithium oxide, and the like.
  • the lithium alloy of the negative electrode active material may be any metal that can be alloyed with lithium.
  • Al, Si, Pb, Sn, In, Bi, Ag, Ba, Ca, Hg, Pd, Pt, Te, Zn It may be a binary, ternary or higher alloy of a metal such as La and lithium.
  • a binary, ternary or higher alloy of a metal such as La and lithium.
  • Such an oxide is preferably amorphous in its structural form. This is because deterioration due to non-uniformity such as crystal grain boundaries or defects is less likely to be caused.
  • the negative electrode active material of the negative electrode material layer is artificial graphite.
  • the binder that can be included in the negative electrode material layer is not particularly limited, but is at least one selected from the group consisting of styrene butadiene rubber, polyacrylic acid, polyvinylidene fluoride, polyimide resin, and polyamideimide resin. Can be mentioned.
  • the binder contained in the negative electrode material layer is styrene butadiene rubber.
  • the conductive aid that can be included in the negative electrode material layer is not particularly limited, but carbon black such as thermal black, furnace black, channel black, ketjen black, and acetylene black, graphite, carbon nanotube, and vapor phase growth.
  • Examples thereof include at least one selected from carbon fibers such as carbon fibers, metal powders such as copper, nickel, aluminum and silver, and polyphenylene derivatives.
  • the component resulting from the thickener component for example, carboxymethylcellulose used at the time of battery manufacture may be contained in the negative electrode material layer.
  • the negative electrode active material and the binder in the negative electrode material layer are a combination of artificial graphite and styrene butadiene rubber.
  • the positive electrode current collector and the negative electrode current collector used for the positive electrode and the negative electrode are members that contribute to collecting and supplying electrons generated in the active material due to the battery reaction.
  • a current collector may be a sheet-like metal member and may have a porous or perforated form.
  • the current collector may be a metal foil, a punching metal, a net or an expanded metal.
  • the positive electrode current collector used for the positive electrode is preferably made of a metal foil containing at least one selected from the group consisting of aluminum, stainless steel, nickel and the like, and may be, for example, an aluminum foil.
  • the negative electrode current collector used for the negative electrode is preferably made of a metal foil containing at least one selected from the group consisting of copper, stainless steel, nickel and the like, and may be, for example, a copper foil.
  • the separator is a member provided from the viewpoint of preventing short circuit due to contact between the positive and negative electrodes and holding the electrolyte.
  • the separator can be said to be a member that allows ions to pass while preventing electronic contact between the positive electrode and the negative electrode.
  • the separator is a porous or microporous insulating member and has a film form due to its small thickness.
  • a polyolefin microporous film may be used as the separator.
  • the microporous film used as the separator may include, for example, only polyethylene (PE) or only polyethylene (PP) as the polyolefin.
  • the separator may be a laminate composed of “a microporous membrane made of PE” and “a microporous membrane made of PP”.
  • the surface of the separator may be covered with an inorganic particle coat layer and / or an adhesive layer.
  • the surface of the separator may have adhesiveness.
  • Electrolyte helps the movement of metal ions released from the electrodes (positive and negative electrodes).
  • the electrolyte may be an electrolyte containing a “non-aqueous” solvent such as an organic electrolyte and an organic solvent and a solute, or may be an “aqueous” electrolyte containing water.
  • the secondary battery of the present invention is preferably a non-aqueous electrolyte secondary battery using a “non-aqueous” electrolyte as the electrolyte.
  • the electrolyte may have a form such as liquid or gel (in the present specification, “liquid” non-aqueous electrolyte is also referred to as “non-aqueous electrolyte solution”).
  • a solvent containing at least carbonate is preferable.
  • Such carbonates may be cyclic carbonates and / or chain carbonates.
  • examples of the cyclic carbonates include at least one selected from the group consisting of propylene carbonate (PC), ethylene carbonate (EC), butylene carbonate (BC), and vinylene carbonate (VC). be able to.
  • examples of the chain carbonates include at least one selected from the group consisting of dimethyl carbonate (DMC), diethyl carbonate (DEC), ethyl methyl carbonate (EMC), and dipropyl carbonate (DPC).
  • non-aqueous electrolyte for example, a mixture of ethylene carbonate and diethyl carbonate.
  • a Li salt such as LiPF 6 or LiBF 4 is preferably used as a specific nonaqueous electrolyte solute.
  • the exterior body is usually a conductive hard case and consists of a main body and a lid.
  • a main-body part consists of the bottom part and side part which comprise the bottom face of the said exterior body.
  • the main body and the lid are sealed after the electrode assembly, the electrolyte, the current collecting lead, and the external terminal are accommodated.
  • the sealing method is not particularly limited, and examples thereof include a laser irradiation method.
  • a material constituting the main body part and the lid part any material capable of constituting a hard case type exterior body in the field of secondary batteries can be used.
  • Such a material may be any material that can achieve electron transfer, and examples thereof include conductive materials such as aluminum, nickel, iron, copper, and stainless steel.
  • the dimensions of the main body and the lid are mainly determined according to the dimensions of the electrode assembly.
  • the dimensions are such that the electrode assembly is prevented from moving (displacement) within the exterior body. It is preferable to have. By preventing the movement of the electrode assembly, the electrode assembly is prevented from being destroyed, and the safety of the secondary battery is improved.
  • the exterior body may be a flexible case such as a pouch made of a laminate film as long as it has conductivity.
  • any spacer used in the field of secondary batteries can be used as the spacer.
  • the material constituting the spacer is not particularly limited, and examples thereof include various insulating polymers such as polyolefin (polyethylene, polypyropylene), polyester (polyethylene terephthalate, polybutylene terephthalate), and acrylic polymer.
  • the spacer is not particularly limited, but may have a film or non-woven fabric form.
  • any current collecting lead used in the field of secondary batteries can be used.
  • a current collecting lead may be made of a material that can achieve electron movement, and is made of a conductive material such as aluminum, nickel, iron, copper, and stainless steel.
  • the positive electrode current collector lead is preferably composed of aluminum, and the negative electrode current collector lead is preferably composed of nickel.
  • the form of the positive electrode current collector lead and the negative electrode current collector lead is not particularly limited, and may be, for example, a wire or a plate.
  • the inventors of the present application have the technical idea of making the shape of the secondary battery correspond to the shape of the electronic medium in order to efficiently install the electronic medium including the curved shape in the secondary battery.
  • the present invention has been devised. According to this technical idea, the shape of the secondary battery according to the embodiment of the present invention depends on the curved shape of the electronic medium. In other words, in the present invention, the shape of the secondary battery (the exterior body) of the present invention is curved corresponding to the curved shape of the electronic medium to be installed. Therefore, due to this, it becomes easy to suitably fit the curved electronic medium into the region where the curved surface of the secondary battery is formed.
  • region of the electronic medium from a secondary battery (exterior body) can be reduced by planar view or sectional view. Therefore, the portion where the protruding area of the electronic medium is reduced can be effectively used as a space for installing other components (such as other electronic media) of the electronic device. From the above, in one embodiment of the present invention, even when the shape of the electronic medium is a curved shape, the electronic medium can be efficiently installed on the secondary battery in the electronic device. As a result, the present invention can meet the demands for thinner and smaller electronic devices.
  • FIG. 1 is a schematic diagram (schematic plan view or schematic side view) of a secondary battery according to an embodiment of the present invention.
  • the secondary battery 100 according to an embodiment of the present invention includes a corner region 10, and the corner region 10 has a concave surface 11 that is recessed inward.
  • the concave surface 11 is a surface on which an electronic medium including a curved shape is arranged.
  • the “corner region of the secondary battery” as used in this specification refers to one of the main surfaces (substantially rectangular main surface) of the exterior body that is a component of the secondary battery in a plan view or a side view.
  • the concave surface 11 includes a curved surface 12 at least at a part thereof. As shown in FIG. 1, the curved surface 12 is an inner curved surface that is curved toward the inner side.
  • the “electronic medium” in the present specification refers to an electronic component or the like that is connected to a secondary battery in an electronic device such as a smartphone or a notebook computer.
  • the shape of the concave surface 11 (including the curved surface 12) of the secondary battery 100 can be substantially the same or similar to the shape of at least a part of the electronic medium. For this reason, it becomes easy to suitably fit the curved electronic medium into the region where the curved surface of the secondary battery is formed. Thereby, even when the shape of the electronic medium is a curved shape, the electronic medium can be efficiently installed on the secondary battery in the electronic device. Therefore, it is possible to meet demands for thinning and miniaturization of electronic devices.
  • this invention takes the following aspect.
  • the curved angle ⁇ of the curved surface 12 is preferably 15 ° or more and 270 ° or less with the bending center point C as a base point.
  • the angle formed between the extending axis of one contour surface 20 and the extending axis of the other contour surface 30 at the virtual corner point 13 is 60 ° or more.
  • the angle is preferably 180 ° or less, although there is no particular limitation, for example, as shown in Fig. 1, the extension axis of one contour surface 20 and the other contour surface 30 at the virtual corner point 13
  • the angle between the extension axis may be 90 °.
  • the “virtual corner point 13” in the present specification refers to the extending axis of one contour surface 20 that forms a part of the contour of the secondary battery 100 in the “corner region 10” of the secondary battery 100.
  • shaft of the other outline surface 30 touches is pointed out.
  • the “curvature center point” in this specification refers to a point equidistant from one end of the curved surface, the other end of the curved surface, and an intermediate point between one end and the other end of the curved surface. Referring to the drawings, as shown in FIG. 9, the “curvature center point” means a distance R to one end of the curved surface, a distance R ′ to an intermediate point of the curved surface, and the other end of the curved surface. Points where all of the distances R ′′ are equal.
  • the type of the electrode assembly can be roughly divided into two types, that is, a planar laminated structure type and a wound structure type.
  • the shape of the exterior body does not change in plan view or side view.
  • the exterior body which is a constituent element of the secondary battery according to the embodiment of the present invention, has a curved surface that is curved at least inward in a plan view or a side view. . From the viewpoint of reducing as much as possible dead space between the electrode assembly and the exterior body in the exterior body, it corresponds to the exterior body having a curved surface curved inward.
  • the planar laminated structure type electrode assembly enclosed in the exterior body also has a curved surface curved inward in a plan view or a side view.
  • the shape of the curved surface of the electrode assembly of the planar laminated structure type can be made substantially the same or similar to the shape of the curved surface of the exterior body.
  • the present invention is not limited to this, and the wound structure type electrode assembly enclosed in the exterior body is also viewed in a plan view or a side surface in response to the exterior body having a curved surface curved inward. It is preferable to have a curved surface that is curved inwardly when viewed. Thereby, the shape of the curved surface of the wound structure type electrode assembly can be made substantially the same or similar to the shape of the curved surface of the exterior body.
  • all of the concave surfaces formed in the corner area of the secondary battery may be curved surfaces according to the curved shape of the electronic medium and the dimensions of the electronic medium. In this case, it can be broadly divided into “1. When the curved center point C is located outside the virtual corner point 13 of the secondary battery 100”, “2. The curved center point C becomes the virtual corner point 13 of the secondary battery 100. It can be divided into “when positioned” and “3. when curved center point C is positioned inside virtual corner point 13 of secondary battery 100”.
  • the bending center point C is located outside the virtual corner point 13 of the secondary battery 100
  • the bending angle is less than 90 °.
  • the case where the bending angle is 15 ° can be mentioned.
  • the present invention is not limited to this, and examples include a case where the bending angle is 30 ° as shown in FIG.
  • an electronic medium having at least a part of a curved surface having a curved angle of less than 90 ° (indicating that the curved angle is relatively small) correspondingly is a curved surface of the secondary battery (exterior body thereof). It becomes possible to install in.
  • the bending center point C is located inside the virtual corner point 13 of the secondary battery 100
  • the bending angle exceeds 90 ° and is 270 ° or less.
  • the case where a curve angle is 180 degrees is mentioned.
  • the present invention is not limited to this, and examples include a case where the bending angle is 270 ° as shown in FIG.
  • an electronic medium having at least a part of a curved surface having a curved angle of more than 90 ° and not more than 270 ° (indicating that the curved angle is relatively large) corresponding to the secondary battery It can be installed on the curved surface of the body.
  • only a part of the concave surface formed in the corner area of the secondary battery may be a curved surface according to the curved shape / size of the electronic medium.
  • the curved surface 12 may be formed in a substantially intermediate region of the concave surface 11.
  • the surface 14 of the concave surface 11 excluding the curved surface 12 has a substantially planar form.
  • the bending center point C is located on the inner side of the virtual corner point 13 of the secondary battery 100, and an example thereof is a case where the bending angle is 180 ° as shown in FIG.
  • an electronic medium having a shape having a substantially flat portion and a curved portion in the region where the concave surface 11 of the secondary battery 100 is formed is preferably used. It can be inserted.
  • three or more and six or less secondary batteries 100 may be arranged in contact with each other while the concave surfaces 12 formed in the corner region 10 are opposed to each other.
  • the curved angle of the curved surface 12 is 60 ° or more and 120 in any secondary battery 100. It is preferable that the angle is not more than °.
  • the curved surfaces are formed in any of the secondary batteries 100.
  • the bending angle of 12 is preferably 90 °.
  • an R chamfered portion is provided on at least one of the one end of the curved surface and the other end of the curved surface in plan view or side view. (Corresponding to a portion having a round shape) is preferably formed.
  • the contact resistance between the electronic medium and the curved surface can be reduced when an electronic medium having a curved shape is provided in the region where the curved surface of the secondary battery is formed. it can. Therefore, the electronic medium having a curved shape can be smoothly fitted in the region where the curved surface of the secondary battery is formed.
  • an R chamfered portion is formed on at least one of the one end of the concave surface and the other end of the concave surface in plan view or side view.
  • the non-curved surface 15 the outer periphery of the exterior body of the secondary battery 100 extending in one direction in a plan view or a side view
  • an R chamfered portion is formed at a boundary portion between the concave surface 11 and the concave surface 11.
  • the contact resistance between the electronic medium and the concave surface can be reduced when the curved electronic medium is provided in the region where the concave surface of the secondary battery is formed. Therefore, the electronic medium having a curved shape can be smoothly fitted in the region where the concave surface of the secondary battery is formed.
  • the bending angle ⁇ of the curved surface is 270 ° or less with the bending center point C as a base point
  • the laser is uniformly irradiated to the welded portion.
  • the bending angle ⁇ of the curved surface is 270 ° or less with the bending center point C as a base point
  • a flexible case such as a pouch made of a laminate film
  • the secondary battery according to an embodiment of the present invention can be used in various fields where power storage is assumed.
  • the secondary battery according to an embodiment of the present invention particularly the non-aqueous electrolyte secondary battery, is merely an example, and the electric / information / communication field (for example, a mobile phone, a smart phone, a notebook) Mobile devices such as personal computers and digital cameras), home / small industrial applications (eg, power tools, golf carts, home / care / industrial robots), large industrial applications (eg, forklifts, elevators, bay ports) Crane field), transportation system field (for example, hybrid vehicle, electric vehicle, bus, train, electric assist bicycle, electric motorcycle, etc.), power system application (for example, various power generation, road conditioner, smart grid, general home installation) Field), as well as space and deep sea applications (eg space probes) It can be used in the field), such as diving research vessel.
  • the electric / information / communication field for example, a mobile phone, a smart phone, a notebook
  • Mobile devices such

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Un mode de réalisation de la présente invention concerne une batterie secondaire dans laquelle un ensemble électrodes et un électrolyte sont logés dans un corps d'emballage. L'ensemble électrodes comprend une électrode positive, une électrode négative et un séparateur qui est disposé entre l'électrode positive et l'électrode négative. La batterie secondaire est caractérisée en ce qu'elle comprend une région de coin; en ce qu'une surface en retrait qui est en retrait vers l'intérieur est formée au niveau de la région de coin; en ce qu'une surface incurvée est formée au niveau d'au moins une partie de la surface évidée, l'angle de courbure de la surface incurvée par rapport à un centre de courbure étant de 15° à 270° (le centre de courbure étant un point qui est à équidistance d'une extrémité de la surface incurvée, l'autre extrémité de la surface incurvée, et n'importe quel point sur la surface incurvée qui se trouve entre l'extrémité et l'autre extrémité); et en ce que, en vue en plan ou en coupe transversale, la surface en retrait qui comprend au moins partiellement la surface incurvée est destinée à disposer un support électronique qui comprend une forme incurvée.
PCT/JP2017/016339 2016-05-31 2017-04-25 Batterie secondaire WO2017208683A1 (fr)

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JP2016109181A JP2019145202A (ja) 2016-05-31 2016-05-31 二次電池
JP2016-109181 2016-05-31

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WO2017208683A1 true WO2017208683A1 (fr) 2017-12-07

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023511097A (ja) * 2020-02-07 2023-03-16 エルジー エナジー ソリューション リミテッド パウチ型二次電池および電池モジュール

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012523094A (ja) * 2009-04-07 2012-09-27 リ−テック・バッテリー・ゲーエムベーハー ガルバニセルの電極ジオメトリ
JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012523094A (ja) * 2009-04-07 2012-09-27 リ−テック・バッテリー・ゲーエムベーハー ガルバニセルの電極ジオメトリ
JP2016506606A (ja) * 2013-03-04 2016-03-03 エルジー・ケム・リミテッド 欠落部が形成された電池セル及びそれを含む電池パック

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023511097A (ja) * 2020-02-07 2023-03-16 エルジー エナジー ソリューション リミテッド パウチ型二次電池および電池モジュール

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