WO2018116623A1 - Secondary battery and battery module - Google Patents

Secondary battery and battery module Download PDF

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Publication number
WO2018116623A1
WO2018116623A1 PCT/JP2017/038565 JP2017038565W WO2018116623A1 WO 2018116623 A1 WO2018116623 A1 WO 2018116623A1 JP 2017038565 W JP2017038565 W JP 2017038565W WO 2018116623 A1 WO2018116623 A1 WO 2018116623A1
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WO
WIPO (PCT)
Prior art keywords
secondary battery
housing
shape
battery
outer shape
Prior art date
Application number
PCT/JP2017/038565
Other languages
French (fr)
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 WO2018116623A1 publication Critical patent/WO2018116623A1/en

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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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • 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
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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 and a battery assembly.
  • the present invention relates to a secondary battery having an electrode assembly including an electrode constituent layer including a positive electrode, a negative electrode, and a separator, and also to a battery assembly including a combination of the secondary battery and a casing.
  • Secondary batteries are so-called “storage batteries” that can be repeatedly charged and discharged, and are used in various applications.
  • secondary batteries are used in mobile devices such as mobile phones, smartphones, and notebook computers.
  • secondary batteries are used in a case. That is, the secondary battery is arranged so as to partially occupy the inside of the casing of the device to be used.
  • the inventor of the present application has found that there is a problem to be overcome in the conventional secondary battery, and has found that it is necessary to take measures for that. Specifically, the present inventors have found that there are the following problems.
  • the secondary battery is housed together with other device elements such as a circuit board and various parts in the housing.
  • the inside of the housing corresponds to a so-called “hollow region”, so that the secondary battery accommodated in the housing can be fixed so as not to move.
  • a separate means fixing tool or adhesive or adhesive sheet, etc.
  • the space inside the housing will be affected to some extent, and it will be necessary for other equipment elements. There is a concern that the storage space is limited.
  • FIG. 15 shows the housing of the secondary battery 100.
  • An exemplary embodiment in which an adhesive or an adhesive sheet 290 is used for fixing to the body 200 is shown). In the first place, it cannot be said that the adhesive and the adhesive sheet are suitable for repeated fixing of the secondary battery.
  • the present invention has been made in view of such problems. That is, the main object of the present invention is to provide a secondary battery that is more suitable for immobilization inside the casing.
  • the inventor of the present application tried to solve the above-mentioned problem by addressing in a new direction rather than responding on the extension of the prior art. As a result, the inventors have reached the invention of a secondary battery in which the main object is achieved.
  • the secondary battery according to the present invention is characterized in that the three-dimensional outer shape of the secondary battery includes at least one recess for fixing the secondary battery.
  • a battery assembly is also provided.
  • Such a battery assembly of the present invention is composed of a combination of a secondary battery and a housing that houses the secondary battery, and the secondary battery is fixed to the housing by a recess.
  • the secondary battery according to the present invention has a preferable outer shape for immobilization in the casing. Specifically, a recessed portion is provided as a fixed portion in the three-dimensional outer shape of the secondary battery, and the secondary battery can be more suitably attached in the housing.
  • the secondary battery can be held in the casing without using a separate means (fixing tool, adhesive, adhesive sheet, or the like) for fixing the battery, the space in the casing can be made more efficient. Can do. Further, since it is not necessary to use an adhesive and an adhesive sheet for fixing, it is possible to avoid a decrease in battery fixing force with time and to repeatedly fix.
  • the perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention (The hollow part of a groove form)
  • the perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention (The hollow part of a level
  • the perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention The typical perspective view for demonstrating fixation to the housing
  • casing in one Embodiment of this invention Typical sectional drawing which shows the aspect of the secondary battery (recessed part of a groove form) fixed to the housing
  • the perspective view which showed typically the three-dimensional external shape in the secondary battery which has the aspect of "the hollow part of the form notched completely” as one Embodiment of this invention Schematic perspective view for illustrating a “battery assembly including a secondary battery” according to an embodiment of the present invention.
  • the direction of “thickness” described directly or indirectly in the present specification is based on the stacking direction of the electrode materials constituting the secondary battery unless otherwise specified, that is, the “thickness” is the positive electrode and the negative electrode. This corresponds to the dimension along the stacking direction.
  • a secondary battery In the present invention, a secondary battery is provided.
  • the “secondary battery” in the present specification refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery of the present invention is not excessively bound by its name, and for example, “electric storage device” can also be included in the subject of the present invention.
  • the secondary battery according to the present invention includes an electrode assembly in which electrode configuration layers including a positive electrode, a negative electrode, and a separator are stacked.
  • 1A and 1B illustrate an electrode assembly.
  • the positive electrode 1 and the negative electrode 2 are stacked via a separator 3 to form an electrode constituent layer 10, and at least one electrode constituent layer 10 is laminated to form an electrode assembly.
  • Yes. 1A has a planar laminated structure in which the electrode constituent layer 10 is laminated in a planar shape without being wound.
  • FIG. 1 (B) it has the winding laminated structure by which the electrode structure layer 10 was wound by the winding shape.
  • the electrode assembly has a so-called stack and fold structure formed by folding a laminate of positive electrode, separator and negative electrode (particularly preferably a laminate extending long in one direction). Also good.
  • an electrode assembly is enclosed in an exterior body together with an electrolyte (for example, a nonaqueous electrolyte).
  • the positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector.
  • a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material.
  • each of the plurality of positive electrodes in the electrode assembly may have a positive electrode material layer provided on both sides of the positive electrode current collector, or a positive electrode material layer provided only on one surface of the positive electrode current collector. It may be what you have. From the viewpoint of further increasing the capacity of the secondary battery, the positive electrode is preferably provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
  • the negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector.
  • a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material.
  • the plurality of negative electrodes in the electrode assembly may each have a negative electrode material layer provided on both sides of the negative electrode current collector, or a negative electrode material layer provided only on one surface of the negative electrode current collector. It may be what you have. From the viewpoint of further increasing the capacity of the secondary battery, the negative electrode is preferably provided with a negative electrode material layer on both sides of the negative electrode current collector.
  • the electrode active materials contained in the positive electrode and the negative electrode are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes 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 the present invention is preferably a non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode and the negative electrode through the non-aqueous electrolyte so that the battery is charged and discharged.
  • the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”, and the positive electrode and the negative electrode have layers capable of occluding and releasing lithium ions.
  • the positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included in the positive electrode material layer for sufficient contact between the particles and shape retention. 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, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid 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, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably included as a positive electrode active material.
  • 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.
  • positive electrode active material may be included as a single species, two or more types may be included in combination. Although it is only an illustration to the last, in the secondary battery which concerns on this invention, the positive electrode active material contained in a positive electrode material layer may be lithium cobaltate.
  • 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 auxiliary agent that can be included 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 may be polyvinylidene fluoride
  • the conductive additive of the positive electrode material layer may be carbon black.
  • the binder and conductive support agent of a positive electrode material layer may be 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), hard carbon, soft 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 a negative electrode material layer may be 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 may be 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 may be 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 used for the positive electrode and the negative electrode is a member provided from the viewpoint of preventing short circuit due to contact between the positive electrode and the negative electrode and maintaining 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.
  • the separator is not particularly limited by its name, and may be a solid electrolyte, a gel electrolyte, insulating inorganic particles or the like having the same function.
  • an electrode assembly including an electrode constituent layer including a positive electrode, a negative electrode, and a separator is enclosed in an outer package together with an electrolyte.
  • the electrolyte is preferably a “non-aqueous” electrolyte such as an organic electrolyte and / or an organic solvent (that is, the electrolyte is a non-aqueous electrolyte).
  • the electrolyte metal ions released from the electrodes (positive electrode and negative electrode) exist, and therefore, the electrolyte assists the movement of the metal ions in the battery reaction.
  • a non-aqueous electrolyte is an electrolyte containing a solvent and a solute.
  • 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.
  • 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).
  • DMC dimethyl carbonate
  • DEC diethyl carbonate
  • EMC ethyl methyl carbonate
  • DPC dipropyl carbonate
  • the combination of cyclic carbonate and chain carbonate may be used as a nonaqueous electrolyte, for example, the mixture of ethylene carbonate and diethyl carbonate may be used.
  • a Li salt such as LiPF 6 and / or LiBF 4 is preferably used as LiPF 6 and / or LiBF 4 is preferably used.
  • the outer package of the secondary battery encloses the electrode assembly in which the electrode constituent layers including the positive electrode, the negative electrode, and the separator are laminated, but may be in a hard case form or a soft case form.
  • the exterior body may be a hard case type corresponding to a so-called “metal can” or a soft case type corresponding to a “pouch” made of a so-called laminate film.
  • the secondary battery of the present invention is characterized by its three-dimensional shape. Specifically, the three-dimensional outer shape of the battery has at least one recess for fixing the secondary battery.
  • the electrode assembly that substantially constitutes the secondary battery includes a recess as its outer shape, and the outer shape of the exterior body that surrounds the electrode assembly also includes the recess. is doing.
  • FIGS. 2 to 4 show a three-dimensional outline 100 'of the secondary battery 100 according to the present invention.
  • a “recessed portion” 150 is provided in such a form that a part thereof is cut out. Due to the presence of the “dent” 150, the appearance of the secondary battery 100 according to the present invention is locally uneven. Even though it is uneven, only the part of the three-dimensional outer shape 100 ′ is cut out, so that the overall appearance of the secondary battery 100 is the shape before cutting (ie, the lower side of FIGS. 2 to 4).
  • the form shown in parentheses is substantially maintained.
  • three-dimensional outer shape means the three-dimensional shape of a secondary battery in a broad sense, and means the outer shape of an electrode assembly or an exterior body that wraps it in a narrow sense.
  • the “recessed portion” substantially means a “recessed portion” or “a portion forming a step” so that the three-dimensional outer shape of the secondary battery is locally uneven.
  • the “recessed portion” has a form obtained by partially cutting out the three-dimensional outer shape 100 ′.
  • the “notched portion” as used herein is as shown in lower brackets in FIGS.
  • the virtual premise is that a three-dimensional outline of a substantially rectangular parallelepiped or a substantially cube as a whole is used as a reference, and then a part is cut out or cut out.
  • the hollow portion in the plan view of the three-dimensional outer shape in the present invention (particularly, the plan view when viewed from the outside along the battery thickness direction), the hollow portion preferably has a rectangular shape, and the rectangular shape is long. It is more preferable.
  • the recessed portion in the present invention is a fixing portion for fixing the battery to the casing in which the secondary battery is accommodated. That is, the hollow part included in the three-dimensional outer shape of the secondary battery is a battery fixing part.
  • the secondary battery 100 is fixed to the casing 200 by the depression 150 of the three-dimensional outer shape 100 ′ engaging with the casing 200. More specifically, the secondary battery 100 is fixed to the casing 200 by fitting the recess 150 of the three-dimensional outer shape 100 ′ and the inner wall structure of the casing 200.
  • the case 200 in which the secondary battery is accommodated is preferably provided with a beam portion 250 from the viewpoint of maintaining its structural strength.
  • the “beam portion” is a so-called “beam”, and has a shape of a continuous projection on the inner wall of the housing as shown in the figure. That is, for example, in a digital device casing such as a notebook personal computer casing (FIG. 6) or a smartphone casing, the beam portion 250 having a form in which locally thick protrusions continuously extend is the casing. 200 is provided on the inner wall.
  • a recess 150 into which such a beam 250 can enter is preferably provided. This means that the secondary battery is fixed to the casing by positioning the depression 150 of the three-dimensional outer shape 100 ′ on the beam section 250 of the casing 200 (FIGS. 5 and 7 to FIG. 7). 9).
  • the beam portion 250 provided on the inner wall of the housing is merely a “beam”, it can continuously extend in a long form. Therefore, it is preferable that the recess 150 also extends in the same manner in the three-dimensional outer shape 100 ′ so that such a beam portion 250 can suitably enter the recess.
  • the term “long” as used herein means, in a broad sense, an elongated shape as a whole, and, in a narrow sense, means an elongated shape, such as the shape of a beam part in a housing of an appliance or digital device. ing.
  • the depth of the recess may be at least half the thickness of the secondary battery, that is, at least half the thickness of the three-dimensional outer shape.
  • the width dimension of the recess portion of the three-dimensional outline is the same as or substantially the same as the width dimension of the beam portion of the housing, and / or the depth dimension of the recess portion of the three-dimensional outline. Is the same as or substantially the same as the height of the beam portion of the housing.
  • the recess 150 has a shape extending in a straight line.
  • the planar view shape of the “rectangular” depression is particularly long.
  • the “planar shape” refers to a contour shape when the object is viewed from the upper side or the lower side along the thickness direction of the object such as the secondary battery and the casing. Because of the “elongate shape”, for example, a suitable recess 150 is elongated in a certain direction on the main surface of the three-dimensional outer shape.
  • the secondary battery 100 housed in a housing such as a digital device may be affected by the limited internal space of the housing.
  • an internal space of a casing of a digital device intended to be thin has a relatively small height. Therefore, it is preferable that the three-dimensional outer shape 100 ′ of the secondary battery used in such a casing is thin as a whole.
  • other device elements such as a circuit board and various parts are also housed, so that the space for the secondary battery can be limited.
  • the plan view shape of the casing itself can be rectangular as a whole, and the plan view shapes of the circuit board and various components are often rectangular, so the plan view shape of the space for the secondary battery is also rectangular or A square shape such as a square can be taken.
  • the secondary battery used for such a case has a substantially rectangular parallelepiped shape as a whole. That is, it is preferable that the three-dimensional outer shape is a substantially rectangular parallelepiped as a whole (see FIGS. 2 to 4).
  • the three-dimensional outer shape is generally a rectangular parallelepiped as a whole (that is, before the notch shown in the lower brackets in FIGS. 2 to 4).
  • the three-dimensional outer shape assuming this form is a substantially rectangular parallelepiped), and the recess 150 extends in a long shape with respect to the three-dimensional outer shape of such a substantially rectangular parallelepiped.
  • the “substantially rectangular parallelepiped” is not limited to a complete “cuboid”, but includes a hexahedral shape including “cubic shape” and “quadrangular pyramid shape”.
  • the recess 150 forms a groove in the three-dimensional outer shape 100 ′, as shown in FIG. 2. That is, the groove-shaped depression 150 is provided by lowering a part of the main surface of the three-dimensional outer shape 100 ′. 8 and 9, a recess 150 is provided in a region excluding the peripheral edge of the main surface of the three-dimensional outer shape 100 ′ to provide a groove shape.
  • the term “groove” as used herein substantially means a recess caused by the relatively high level of both sides. As shown in FIG.
  • the secondary battery 100 is fixed by inserting the beam portion 250 of the housing 200 into the recess 150 existing as a “groove” in the three-dimensional outer shape 100 ′.
  • the groove-shaped depression 150 and the beam 250 are fitted and engaged with each other, whereby the secondary battery 100 can be more suitably fixed to the housing 200.
  • the indentation 150 has at least a part of the peripheral edge of the three-dimensional outer shape 100 ′. It is made. As in FIG. 7, a recess 150 having a form in which an edge is partially cut is provided by lowering a part of the main surface of the three-dimensional outer shape 100 ′.
  • a recess is provided at the outer peripheral edge in the main surface region of the three-dimensional outer shape 100 ′, thereby providing a step-shaped recess 150. In this case, as shown in FIGS.
  • the beam portion 250 of the housing 200 is positioned so as to fill the recess 150 existing in a step shape with the three-dimensional outer shape 100 ′, and the secondary battery 100 is fixed.
  • the beam portion 250 acts as a “position misalignment prevention” stopper with respect to the three-dimensional outer shape 100 ′ by the stepped recess 150, so that the secondary battery 100 is suitably mounted on the housing 200. Can be fixed.
  • the secondary battery 100 of the present invention may include both a “groove-shaped depression 150A” and a “step-shaped depression 150B”. That is, according to the form of the inner wall of the housing in which the battery is stored, both the “groove-shaped depression 150A” and the “step-shaped depression 150B” are provided on the main surface of the three-dimensional outer shape 100 ′. Also good. Since two places contribute to immobilization, stronger immobilization can be achieved. Note that the present invention is not limited to an embodiment in which both the “groove-shaped depression 150A” and the “step-shaped depression 150B” are engaged with the beam portion. For example, only the “groove-shaped depression 150A” is the beam of the housing. It may be engaged with the part.
  • the thickness dimension may be gradually reduced. If the “step-shaped depression 150B” is positioned in the internal space corresponding to such a gradually reduced casing location, the secondary battery can be more suitably accommodated along the casing inner wall contour. That is, in such a case, the secondary battery can be fixed also by the engagement between the “step-shaped recess 150B” and the “inner wall surface”.
  • the recess 150 corresponds to a portion where the thickness is locally reduced in the three-dimensional outer shape 100 ′. That is, in a preferred aspect of the secondary battery of the present invention, the recess is provided so as to partially reduce the thickness dimension of the three-dimensional outer shape.
  • “partially reduce” does not mean that the depression is provided so that the thickness of the three-dimensional outer shape is completely eliminated, but the local region with the three-dimensional outer shape is relatively It means that it is thinner.
  • the recess of the three-dimensional outer shape has a complementary shape with respect to the beam portion of the housing. That is, the shape of the depression 150 and the shape of the beam 250 are complementary to each other.
  • “having a complementary shape” as used in the present invention has a shape in which the portions facing each other in the outline of the hollow part and the outline of the beam part in a sectional view substantially overlap each other. It means that.
  • the recessed portion 150 of the three-dimensional outer shape 100 ′ and the beam portion 250 of the housing 200 can be in close contact with each other. It can be suitably immobilized.
  • the “recessed portion” included in the three-dimensional outer shape of the secondary battery of the present invention is preferably a battery fixing portion (in other words, the “recessed portion” on the main surface of the secondary battery is a local region for fixing the battery. It can be said that it forms a space or a gap).
  • the “recessed portion” is a fixing portion that engages with the beam portion of the housing, and has a characteristic suitable as such a fixing portion.
  • the recessed portion 150 extends to both sides and edges facing each other on the main surface of the three-dimensional outer shape 100 '. In the aspect shown in FIG.
  • the recess 150 extends so as to penetrate from the front side of the paper to the back side of the paper. This can be said that the depression 150 extends so as to reach both opposite edges (or both side surfaces) of the three-dimensional outer shape.
  • the recessed portion 150 as the battery fixing portion is intended to be engaged with the beam portion of the housing, one of the opposing main surfaces of the three-dimensional outer shape 100 ′ (for example, on the battery lower surface or the battery bottom surface). It is preferable that the depression 150 is positioned only on the corresponding main surface). This is preferable in that the recess portion is not excessively provided, and the battery capacity can be more suitably ensured while having a battery fixing function.
  • the present invention can be embodied in various forms. For example, the following modes can be cited.
  • the recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG.
  • the recess 150 provided in the three-dimensional outer shape 100 ′ extends in two directions. That is, the recess 150 is provided so as to extend not only in a certain direction but also in another direction different from the certain direction.
  • casing beam part can be obtained.
  • the recessed portions 150 extending in the directions orthogonal to each other are suitable when the beam portion of the housing includes a portion extending in the same manner.
  • a “multi-directionally extending depression” has a shape in plan view that is based on a rectangle (preferably a long rectangle) and is combined with other shapes. (In the embodiment shown in the figure, it can be said that substantially the same rectangle is further combined).
  • the recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG.
  • the height level of the main surface of the three-dimensional outer shape 100 ′ provided with the recess 150 is locally different.
  • the height levels of the main surfaces may be different from each other with the groove-shaped depression 150A as a boundary.
  • the thickness dimension may be gradually reduced. Therefore, a secondary battery having locally different main surface height levels may be more suitable for such a gradually reduced housing.
  • the recess of the battery and the beam of the casing are engaged with each other, and the overall shape (particularly the main surface) of the battery and the inner wall of the casing are positioned proximal to each other. (Particularly preferably, they can be brought into close contact with each other), and more suitable battery immobilization can be realized.
  • the recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG.
  • the recess 150 provided in the three-dimensional outer shape 100 ′ has a “completely cut-out portion” 150C. That is, the recessed portion 150C is provided so as to cut out a part of the three-dimensional outer shape in the thickness direction. Even such a “completely cut-out” depression 150C can be engaged with a beam or a protrusion provided on the inner wall of the housing (for example, the three-dimensional outer shape forming the depression 150C). Since the side surface and the beam or protrusion of the housing can be brought into contact with each other), this contributes to fixing the battery.
  • the recess portion 150C having a “fully cut shape” may be arranged in parallel with the recess portion 150A having a groove shape (in the embodiment shown, the recess portion 150C having a “completely cut shape”). And a groove-shaped depression 150A are integrated side by side). In this way, by combining the “completely cut-out form”, it is possible to form a recess according to various forms of the inner wall of the housing, and the degree of freedom in design is increased.
  • a battery assembly including the secondary battery described above is also provided.
  • this invention is the battery assembly 300 comprised from the combination of the secondary battery 100 and the housing
  • the secondary battery 100 is fixed to the housing 200 by the recess 150.
  • the secondary battery 100 is fixed by the recess 150 and the beam 250 of the housing 200 engaging each other.
  • the recessed part of the three-dimensional outer shape of the secondary battery and the beam part of the housing have a complementary shape to each other, and the secondary battery and the housing are combined in a state of fitting with each other. ing.
  • the battery assembly 300 of the present invention is not limited to the state in which the secondary battery 100 is fixed to the housing 200, but may be in a state before being fixed. That is, the battery assembly 300 may have a so-called “kit” mode, and the secondary battery 100 and the housing 200 may be provided separately.
  • the housing 200 may be a digital device housing such as a laptop computer housing (FIG. 6) or a smartphone housing.
  • the secondary battery 100, the “dent” 150 of the battery, the “beam portion of the casing” 250, etc. are described in detail in the above [Characteristics of the secondary battery of the present invention]. I will omit the explanation.
  • the battery assembly of the present invention is preferably used in various applications where the battery is used for the casing.
  • the secondary battery according to the present invention can be used in various fields where power storage is assumed.
  • secondary batteries are used in the electrical / information / communication field where mobile devices are used (for example, mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, electronic paper, etc.) Mobile equipment), household / small industrial applications (eg, power tools, golf carts, household / nursing / industrial robots), large industrial applications (eg, forklifts, elevators, bay harbor cranes), transportation System fields (for example, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles, etc.), power system applications (for example, various power generation, road conditioners, smart grids, general home-installed energy storage systems) ), And IoT fields, space and deep sea applications (for example, space) ⁇ , areas such as submersible research vessel) can be used for such.
  • mobile devices for example, mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, electronic paper, etc.
  • household / small industrial applications eg, power

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  • Chemical Kinetics & Catalysis (AREA)
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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

The present invention provides a secondary battery suitable for immobilization inside a casing. This secondary battery 100 is configured in such a manner that the three-dimensional external shape 100' thereof includes a recessed section for the immobilization of the battery into a casing 200.

Description

二次電池および電池組合体Secondary battery and battery assembly
　本発明は二次電池および電池組合体に関する。特に、正極、負極およびセパレータを含む電極構成層から構成された電極組立体を有して成る二次電池に関すると共に、その二次電池と筐体との組合せからから成る電池組合体にも関する。 The present invention relates to a secondary battery and a battery assembly. In particular, the present invention relates to a secondary battery having an electrode assembly including an electrode constituent layer including a positive electrode, a negative electrode, and a separator, and also to a battery assembly including a combination of the secondary battery and a casing.
　二次電池は、いわゆる“蓄電池”ゆえ充電・放電の繰り返しが可能であり、様々な用途に用いられている。例えば、携帯電話、スマートフォンおよびノートパソコンなどのモバイル機器に二次電池が用いられている。 Secondary batteries are so-called “storage batteries” that can be repeatedly charged and discharged, and are used in various applications. For example, secondary batteries are used in mobile devices such as mobile phones, smartphones, and notebook computers.
　モバイル機器などを含め種々の電池用途では、二次電池は筐体内に収められて使用される。つまり、使用される機器の筐体内部を部分的に占めるように二次電池が配置される。 In various battery applications including mobile devices, secondary batteries are used in a case. That is, the secondary battery is arranged so as to partially occupy the inside of the casing of the device to be used.
特表２０１５－５３６０３６号公報Special table 2015-536036 gazette
　本願発明者は、従前の二次電池では克服すべき課題があることに気付き、そのための対策を取る必要性を見出した。具体的には以下の課題があることを本願発明者は見出した。 The inventor of the present application has found that there is a problem to be overcome in the conventional secondary battery, and has found that it is necessary to take measures for that. Specifically, the present inventors have found that there are the following problems.
　二次電池は、筐体内において回路基板および各種部品などの他の機器要素と共に収容されている。筐体内部は、いわば“中空領域”に相当するので、筐体に収容される二次電池は、動かないように固定することが考えられる。しかしながら、電池固定のために別途の手段（固定具または接着剤もしくは接着シートなど）を用いると、筐体内部のスペースが程度の差はあれ影響を受けることになり、他の機器要素のための収容スペースが制限されることが懸念される。 The secondary battery is housed together with other device elements such as a circuit board and various parts in the housing. The inside of the housing corresponds to a so-called “hollow region”, so that the secondary battery accommodated in the housing can be fixed so as not to move. However, if a separate means (fixing tool or adhesive or adhesive sheet, etc.) is used to fix the battery, the space inside the housing will be affected to some extent, and it will be necessary for other equipment elements. There is a concern that the storage space is limited.
　また、二次電池の固定化に例えば接着剤または接着シートなどが使用された場合では、接着効果が経時的に低下してしまうことが懸念される（図１５には、二次電池１００の筐体２００への固定化に接着剤または接着シート２９０が用いられた例示態様を示している）。また、そもそも接着剤および接着シートは二次電池の繰返しの固定化に適しているとはいえない。 Further, in the case where, for example, an adhesive or an adhesive sheet is used for fixing the secondary battery, there is a concern that the adhesive effect may deteriorate with time (FIG. 15 shows the housing of the secondary battery 100). An exemplary embodiment in which an adhesive or an adhesive sheet 290 is used for fixing to the body 200 is shown). In the first place, it cannot be said that the adhesive and the adhesive sheet are suitable for repeated fixing of the secondary battery.
　本発明はかかる課題に鑑みて為されたものである。即ち、本発明の主たる目的は、筐体内部における固定化により好適な二次電池を提供することである。 The present invention has been made in view of such problems. That is, the main object of the present invention is to provide a secondary battery that is more suitable for immobilization inside the casing.
　本願発明者は、従来技術の延長線上で対応するのではなく、新たな方向で対処することによって上記課題の解決を試みた。その結果、上記主たる目的が達成された二次電池の発明に至った。 The inventor of the present application tried to solve the above-mentioned problem by addressing in a new direction rather than responding on the extension of the prior art. As a result, the inventors have reached the invention of a secondary battery in which the main object is achieved.
　本発明に係る二次電池は、二次電池の固定のために、その二次電池の三次元外形が少なくとも１つの窪み部を含むことを特徴とする。 The secondary battery according to the present invention is characterized in that the three-dimensional outer shape of the secondary battery includes at least one recess for fixing the secondary battery.
　また、本発明では、電池組合体も提供される。かかる本発明の電池組合体は、二次電池とそれを収容する筐体との組合せから構成され、二次電池が窪み部によって筐体に固定されることを特徴とする。 In the present invention, a battery assembly is also provided. Such a battery assembly of the present invention is composed of a combination of a secondary battery and a housing that houses the secondary battery, and the secondary battery is fixed to the housing by a recess.
　本発明に係る二次電池は、筐体内における固定化に好ましい外形を有している。具体的には、二次電池の三次元外形に窪み部が固定部として設けられており、筐体内に二次電池をより好適に取り付けることができる。 The secondary battery according to the present invention has a preferable outer shape for immobilization in the casing. Specifically, a recessed portion is provided as a fixed portion in the three-dimensional outer shape of the secondary battery, and the secondary battery can be more suitably attached in the housing.
　本発明では、電池固定のために別途の手段（固定具または接着剤もしくは接着シートなど）を使用せずに二次電池を筐体に保持できるので、筐体内の収容スペースの効率化を図ることができる。また、固定化に接着剤および接着シートを使用しなくて済むので、電池固定力の経時的低下を回避でき、繰り返しの固定化も可能となる。 In the present invention, since the secondary battery can be held in the casing without using a separate means (fixing tool, adhesive, adhesive sheet, or the like) for fixing the battery, the space in the casing can be made more efficient. Can do. Further, since it is not necessary to use an adhesive and an adhesive sheet for fixing, it is possible to avoid a decrease in battery fixing force with time and to repeatedly fix.
電極構成層を模式的に示した断面図（図１（Ａ）：非巻回の平面積層型、図１（Ｂ）：巻回型）Sectional drawing which showed the electrode structure layer typically (FIG. 1 (A): Unwinding plane lamination | stacking type, FIG.1 (B): Winding type) 本発明の一実施形態に係る二次電池の三次元外形を模式的に示した斜視図（溝形態の窪み部）The perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention (The hollow part of a groove form) 本発明の一実施形態に係る二次電池の三次元外形を模式的に示した斜視図（段差形態の窪み部）The perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention (The hollow part of a level | step difference form) 本発明の一実施形態に係る二次電池の三次元外形を模式的に示した斜視図（段差形態の窪み部）The perspective view which showed typically the three-dimensional external shape of the secondary battery which concerns on one Embodiment of this invention (The hollow part of a level | step difference form) 本発明の一実施形態に係る二次電池の筐体への固定化を説明するための模式的斜視図The typical perspective view for demonstrating fixation to the housing | casing of the secondary battery which concerns on one Embodiment of this invention. 本発明の一実施形態における筐体の内部・内壁の一例を模式的に示した斜視図The perspective view which showed typically an example of the internal and inner wall of the housing | casing in one Embodiment of this invention 本発明の一実施形態として筐体に固定化された二次電池（溝形態の窪み部）の態様を示す模式的断面図Typical sectional drawing which shows the aspect of the secondary battery (recessed part of a groove form) fixed to the housing | casing as one Embodiment of this invention. 本発明の一実施形態として筐体に固定化された二次電池（段差形態の窪み部）の態様を示す模式的断面図Typical sectional drawing which shows the aspect of the secondary battery (step-shaped hollow part) fixed to the housing | casing as one Embodiment of this invention. 本発明の一実施形態として筐体に固定化された二次電池（段差形態の窪み部）の態様を示す模式的断面図Typical sectional drawing which shows the aspect of the secondary battery (step-shaped hollow part) fixed to the housing | casing as one Embodiment of this invention. 本発明の一実施形態として溝形態および段差形態の双方の窪み部を備えた二次電池の三次元外形を模式的に示した斜視図The perspective view which showed typically the three-dimensional external shape of the secondary battery provided with the hollow part of both groove | channel form and level | step difference form as one Embodiment of this invention. 本発明の一実施形態として“複数方向延在の窪み部”の態様を有する二次電池における三次元外形を模式的に示した斜視図The perspective view which showed typically the three-dimensional external shape in the secondary battery which has the aspect of "the hollow part extended in multiple directions" as one Embodiment of this invention. 本発明の一実施形態として“異なる主面レベルの形態”に係る態様を有する二次電池における三次元外形を模式的に示した斜視図The perspective view which showed typically the three-dimensional external shape in the secondary battery which has the aspect which concerns on "the form of a different main surface level" as one Embodiment of this invention. 本発明の一実施形態として“完全に切り欠いた形態の窪み部”の態様を有する二次電池における三次元外形を模式的に示した斜視図The perspective view which showed typically the three-dimensional external shape in the secondary battery which has the aspect of "the hollow part of the form notched completely" as one Embodiment of this invention 本発明の一実施形態に係る「二次電池を備えた電池組合体」を例示するための模式的斜視図Schematic perspective view for illustrating a “battery assembly including a secondary battery” according to an embodiment of the present invention. 筐体に対する従前の二次電池の収納態様を例示するための模式的断面図（従来技術）Schematic cross-sectional view for illustrating a storage mode of a conventional secondary battery in a housing (prior art)
　以下では、本発明の一実施形態に係る二次電池および電池組合体をより詳細に説明する。必要に応じて図面を参照して説明を行うものの、図面における各種の要素は、本発明の理解のために模式的かつ例示的に示したにすぎず、外観や寸法比などは実物と異なり得る。 Hereinafter, a secondary battery and a battery assembly according to an embodiment of the present invention will be described in more detail. Although the description will be made with reference to the drawings as necessary, the various elements in the drawings are merely schematically and exemplarily shown for the understanding of the present invention, and the appearance and size ratio may be different from the actual ones. .
　本明細書で直接的または間接的に説明される“厚み”の方向は、特記しない限り、二次電池を構成する電極材の積層方向に基づいており、即ち、“厚み”は正極と負極との積層方向に沿った寸法に相当する。 The direction of “thickness” described directly or indirectly in the present specification is based on the stacking direction of the electrode materials constituting the secondary battery unless otherwise specified, that is, the “thickness” is the positive electrode and the negative electrode. This corresponds to the dimension along the stacking direction.
　また、本明細書で直接的または間接的に用いる“上下方向”は、それぞれ図中における上下方向に相当する。特記しない限り、同じ符号または記号は、同じ部材または同じ意味内容を示すものとする。 Also, the “vertical direction” used directly or indirectly in the present specification corresponds to the vertical direction in the figure. Unless otherwise specified, the same symbols or symbols indicate the same members or the same meaning.
［本発明の二次電池の構成］
　本発明では二次電池が提供される。本明細書でいう「二次電池」とは、充電・放電の繰り返しが可能な電池のことを指している。従って、本発明の二次電池は、その名称に過度に拘泥されるものでなく、例えば“蓄電デバイス”なども本発明の対象に含まれ得る。 [Configuration of Secondary Battery of the Present Invention]
In the present invention, a secondary battery is provided. The “secondary battery” in the present specification refers to a battery that can be repeatedly charged and discharged. Therefore, the secondary battery of the present invention is not excessively bound by its name, and for example, “electric storage device” can also be included in the subject of the present invention.
　本発明に係る二次電池は、正極、負極及びセパレータを含む電極構成層が積層した電極組立体を有して成る。図１（Ａ）および１（Ｂ）には電極組立体を例示している。図示されるように、正極１と負極２とはセパレータ３を介して積み重なって電極構成層１０を成しており、かかる電極構成層１０が少なくとも１つ以上積層して電極組立体を構成している。図１（Ａ）では、電極構成層１０が巻回されずに平面状に積層した平面積層構造を有している。一方、図１（Ｂ）では、電極構成層１０が巻回状に巻かれた巻回積層構造を有している。更にいえば、電極組立体は、正極、セパレータおよび負極の積層体（特に好ましくは一方向に長く延在する積層体）を折り畳むことで形成された、いわゆるスタックアンドフォールド構造を有するものであってもよい。二次電池ではこのような電極組立体が電解質（例えば非水電解質）と共に外装体に封入されている。 The secondary battery according to the present invention includes an electrode assembly in which electrode configuration layers including a positive electrode, a negative electrode, and a separator are stacked. 1A and 1B illustrate an electrode assembly. As shown in the figure, the positive electrode 1 and the negative electrode 2 are stacked via a separator 3 to form an electrode constituent layer 10, and at least one electrode constituent layer 10 is laminated to form an electrode assembly. Yes. 1A has a planar laminated structure in which the electrode constituent layer 10 is laminated in a planar shape without being wound. On the other hand, in FIG. 1 (B), it has the winding laminated structure by which the electrode structure layer 10 was wound by the winding shape. Furthermore, the electrode assembly has a so-called stack and fold structure formed by folding a laminate of positive electrode, separator and negative electrode (particularly preferably a laminate extending long in one direction). Also good. In a secondary battery, such an electrode assembly is enclosed in an exterior body together with an electrolyte (for example, a nonaqueous electrolyte).
　正極は、少なくとも正極材層および正極集電体から構成されている。正極では正極集電体の少なくとも片面に正極材層が設けられており、正極材層には電極活物質として正極活物質が含まれている。例えば、電極組立体における複数の正極は、それぞれ、正極集電体の両面に正極材層が設けられているものでよいし、あるいは、正極集電体の片面にのみ正極材層が設けられているものでもよい。二次電池のさらなる高容量化の観点でいえば正極は正極集電体の両面に正極材層が設けられていることが好ましい。 The positive electrode is composed of at least a positive electrode material layer and a positive electrode current collector. In the positive electrode, a positive electrode material layer is provided on at least one surface of the positive electrode current collector, and the positive electrode material layer contains a positive electrode active material as an electrode active material. For example, each of the plurality of positive electrodes in the electrode assembly may have a positive electrode material layer provided on both sides of the positive electrode current collector, or a positive electrode material layer provided only on one surface of the positive electrode current collector. It may be what you have. From the viewpoint of further increasing the capacity of the secondary battery, the positive electrode is preferably provided with a positive electrode material layer on both surfaces of the positive electrode current collector.
　負極は、少なくとも負極材層および負極集電体から構成されている。負極では負極集電体の少なくとも片面に負極材層が設けられており、負極材層には電極活物質として負極活物質が含まれている。例えば、電極組立体における複数の負極は、それぞれ、負極集電体の両面に負極材層が設けられているものでよいし、あるいは、負極集電体の片面にのみ負極材層が設けられているものでもよい。二次電池のさらなる高容量化の観点でいえば負極は負極集電体の両面に負極材層が設けられていることが好ましい。 The negative electrode is composed of at least a negative electrode material layer and a negative electrode current collector. In the negative electrode, a negative electrode material layer is provided on at least one surface of the negative electrode current collector, and the negative electrode material layer contains a negative electrode active material as an electrode active material. For example, the plurality of negative electrodes in the electrode assembly may each have a negative electrode material layer provided on both sides of the negative electrode current collector, or a negative electrode material layer provided only on one surface of the negative electrode current collector. It may be what you have. From the viewpoint of further increasing the capacity of the secondary battery, the negative electrode is preferably provided with a negative electrode material layer on both sides of the negative electrode current collector.
　正極および負極に含まれる電極活物質、即ち、正極活物質および負極活物質は、二次電池において電子の受け渡しに直接関与する物質であり、充放電、すなわち電池反応を担う正負極の主物質である。より具体的には、「正極材層に含まれる正極活物質」および「負極材層に含まれる負極活物質」に起因して電解質にイオンがもたらされ、かかるイオンが正極と負極との間で移動して電子の受け渡しが行われて充放電がなされる。正極材層および負極材層は特にリチウムイオンを吸蔵放出可能な層であることが好ましい。つまり、本発明に係る二次電池は、非水電解質を介してリチウムイオンが正極と負極との間で移動して電池の充放電が行われる非水電解質二次電池となっていることが好ましい。充放電にリチウムイオンが関与する場合、本発明に係る二次電池は、いわゆる“リチウムイオン電池”に相当し、正極および負極がリチウムイオンを吸蔵放出可能な層を有する。 The electrode active materials contained in the positive electrode and the negative electrode, that is, the positive electrode active material and the negative electrode active material are materials directly involved in the transfer of electrons in the secondary battery, and are the main materials of the positive and negative electrodes 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. That is, the secondary battery according to the present invention is preferably a non-aqueous electrolyte secondary battery in which lithium ions move between the positive electrode and the negative electrode through the non-aqueous electrolyte so that the battery is charged and discharged. . When lithium ions are involved in charging and discharging, the secondary battery according to the present invention corresponds to a so-called “lithium ion battery”, and the positive electrode and the negative electrode have layers capable of occluding and releasing lithium ions.
　正極材層の正極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダーが正極材層に含まれていることが好ましい。更には、電池反応を推進する電子の伝達を円滑にするために導電助剤が正極材層に含まれていてもよい。同様にして、負極材層の負極活物質は例えば粒状体から成るところ、粒子同士の十分な接触と形状保持のためにバインダーが含まれることが好ましく、電池反応を推進する電子の伝達を円滑にするために導電助剤が負極材層に含まれていてもよい。このように、複数の成分が含有されて成る形態ゆえ、正極材層および負極材層はそれぞれ“正極合材層”および“負極合材層”などと称すこともできる。 The positive electrode active material of the positive electrode material layer is made of, for example, a granular material, and it is preferable that a binder is included in the positive electrode material layer for sufficient contact between the particles and shape retention. 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. Similarly, 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, and smooth transmission of electrons that promote the battery reaction. In order to do so, a conductive aid may be included in the negative electrode material layer. Thus, because of the form in which a plurality of components are contained, 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.
　正極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、正極活物質は例えばリチウム含有複合酸化物であることが好ましい。より具体的には、正極活物質は、リチウムと、コバルト、ニッケル、マンガンおよび鉄から成る群から選択される少なくとも１種の遷移金属とを含むリチウム遷移金属複合酸化物であることが好ましい。つまり、本発明に係る二次電池の正極材層においては、そのようなリチウム遷移金属複合酸化物が正極活物質として好ましくは含まれている。例えば、正極活物質はコバルト酸リチウム、ニッケル酸リチウム、マンガン酸リチウム、リン酸鉄リチウム、または、それらの遷移金属の一部を別の金属で置き換えたものであってよい。このような正極活物質は、単独種として含まれてよいものの、二種以上が組み合わされて含まれていてもよい。あくまでも例示にすぎないが、本発明に係る二次電池では、正極材層に含まれる正極活物質がコバルト酸リチウムとなっていてよい。 The positive electrode active material is preferably a material that contributes to occlusion and release of lithium ions. From this point of view, the positive electrode active material is preferably, for example, a lithium-containing composite oxide. More specifically, 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, in the positive electrode material layer of the secondary battery according to the present invention, such a lithium transition metal composite oxide is preferably included as a positive electrode active material. For example, 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. Although such a positive electrode active material may be included as a single species, two or more types may be included in combination. Although it is only an illustration to the last, in the secondary battery which concerns on this invention, the positive electrode active material contained in a positive electrode material layer may be lithium cobaltate.
　正極材層に含まれる得るバインダーとしては、特に制限されるわけではないが、ポリフッ化ビリニデン、ビリニデンフルオライド－ヘキサフルオロプロピレン共重合体、ビリニデンフルオライド－テトラフルオロチレン共重合体およびポリテトラフルオロチレンなどから成る群から選択される少なくとも１種を挙げることができる。正極材層に含まれる得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。例えば、正極材層のバインダーはポリフッ化ビニリデンであってよく、また、正極材層の導電助剤はカーボンブラックであってよい。あくまでも例示にすぎないが、正極材層のバインダーおよび導電助剤は、ポリフッ化ビニリデンとカーボンブラックとの組合せになっていてよい。 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 auxiliary agent that can be included 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. 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. For example, the binder of the positive electrode material layer may be polyvinylidene fluoride, and the conductive additive of the positive electrode material layer may be carbon black. Although it is only an illustration to the last, the binder and conductive support agent of a positive electrode material layer may be a combination of polyvinylidene fluoride and carbon black.
　負極活物質は、リチウムイオンの吸蔵放出に資する物質であることが好ましい。かかる観点でいえば、負極活物質は例えば各種の炭素材料、酸化物、または、リチウム合金などであることが好ましい。 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.
　負極活物質の各種の炭素材料としては、黒鉛（天然黒鉛、人造黒鉛）、ハードカーボン、ソフトカーボン、ダイヤモンド状炭素などを挙げることができる。特に、黒鉛は電子伝導性が高く、負極集電体との接着性が優れる点などで好ましい。負極活物質の酸化物としては、酸化シリコン、酸化スズ、酸化インジウム、酸化亜鉛および酸化リチウムなどから成る群から選択される少なくとも１種を挙げることができる。負極活物質のリチウム合金は、リチウムと合金形成され得る金属であればよく、例えば、Ａｌ、Ｓｉ、Ｐｂ、Ｓｎ、Ｉｎ、Ｂｉ、Ａｇ、Ｂａ、Ｃａ、Ｈｇ、Ｐｄ、Ｐｔ、Ｔｅ、Ｚｎ、Ｌａなどの金属とリチウムとの２元、３元またはそれ以上の合金であってよい。このような酸化物は、その構造形態としてアモルファスとなっていることが好ましい。結晶粒界または欠陥といった不均一性に起因する劣化が引き起こされにくくなるからである。あくまでも例示にすぎないが、本発明に係る二次電池では、負極材層の負極活物質が人造黒鉛となっていてよい。 Examples of various carbon materials of the negative electrode active material include graphite (natural graphite, artificial graphite), hard carbon, soft carbon, diamond-like carbon, and the like. In particular, 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. For example, 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. 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. Although it is only an illustration to the last, in the secondary battery which concerns on this invention, the negative electrode active material of a negative electrode material layer may be artificial graphite.
　負極材層に含まれる得るバインダーとしては、特に制限されるわけではないが、スチレンブタジエンゴム、ポリアクリル酸、ポリフッ化ビニリデン、ポリイミド系樹脂およびポリアミドイミド系樹脂から成る群から選択される少なくとも１種を挙げることができる。例えば、負極材層に含まれるバインダーはスチレンブタジエンゴムとなっていてよい。負極材層に含まれる得る導電助剤としては、特に制限されるわけではないが、サーマルブラック、ファーネスブラック、チャンネルブラック、ケッチェンブラックおよびアセチレンブラック等のカーボンブラック、黒鉛、カーボンナノチューブおよび気相成長炭素繊維等の炭素繊維、銅、ニッケル、アルミニウムおよび銀等の金属粉末、ならびに、ポリフェニレン誘導体などから選択される少なくとも１種を挙げることができる。なお、負極材層には、電池製造時に使用された増粘剤成分（例えばカルボキシルメチルセルロース）に起因する成分が含まれていてもよい。 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. For example, the binder contained in the negative electrode material layer may be 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. In addition, 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.
　あくまでも例示にすぎないが、負極材層における負極活物質およびバインダーは人造黒鉛とスチレンブタジエンゴムとの組合せになっていてよい。 For illustration purposes only, the negative electrode active material and the binder in the negative electrode material layer may be a combination of artificial graphite and styrene butadiene rubber.
　正極および負極に用いられる正極集電体および負極集電体は電池反応に起因して活物質で発生した電子を集めたり供給したりするのに資する部材である。このような集電体は、シート状の金属部材であってよく、多孔または穿孔の形態を有していてよい。例えば、集電体は金属箔、パンチングメタル、網またはエキスパンドメタル等であってよい。正極に用いられる正極集電体は、アルミニウム、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えばアルミニウム箔であってよい。一方、負極に用いられる負極集電体は、銅、ステンレスおよびニッケル等から成る群から選択される少なくとも１種を含んだ金属箔から成るものが好ましく、例えば銅箔であってよい。 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. Such a current collector may be a sheet-like metal member and may have a porous or perforated form. For example, 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. On the other hand, 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.
　正極および負極に用いられるセパレータは、正負極の接触による短絡防止および電解質保持などの観点から設けられる部材である。換言すれば、セパレータは、正極と負極と間の電子的接触を防止しつつイオンを通過させる部材であるといえる。好ましくは、セパレータは多孔性または微多孔性の絶縁性部材であり、その小さい厚みに起因して膜形態を有している。あくまでも例示にすぎないが、ポリオレフィン製の微多孔膜がセパレータとして用いられてよい。この点、セパレータとして用いられる微多孔膜は、例えば、ポリオレフィンとしてポリエチレン（ＰＥ）のみ又はポリエチレン（ＰＰ）のみを含んだものであってよい。更にいえば、セパレータは、“ＰＥ製の微多孔膜”と“ＰＰ製の微多孔膜”とから構成される積層体であってもよい。セパレータの表面が無機粒子コート層および／または接着層等により覆われていてもよい。セパレータの表面が接着性を有していてもよい。なお、本発明において、セパレータは、その名称によって特に拘泥されるべきでなく、同様の機能を有する固体電解質、ゲル状電解質、絶縁性の無機粒子などであってもよい。 The separator used for the positive electrode and the negative electrode is a member provided from the viewpoint of preventing short circuit due to contact between the positive electrode and the negative electrode and maintaining the electrolyte. In other words, 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. Preferably, the separator is a porous or microporous insulating member and has a film form due to its small thickness. Although only illustrative, a polyolefin microporous film may be used as the separator. In this regard, the microporous film used as the separator may include, for example, only polyethylene (PE) or only polyethylene (PP) as the polyolefin. Furthermore, 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. In the present invention, the separator is not particularly limited by its name, and may be a solid electrolyte, a gel electrolyte, insulating inorganic particles or the like having the same function.
　本発明の二次電池では、正極、負極およびセパレータを含む電極構成層から成る電極組立体が電解質と共に外装体に封入されている。正極および負極がリチウムイオンを吸蔵放出可能な層を有する場合、電解質は有機電解質および／または有機溶媒などの“非水系”の電解質であることが好ましい（すなわち、電解質が非水電解質となっていることが好ましい）。電解質では電極（正極・負極）から放出された金属イオンが存在することになり、それゆえ、電解質は電池反応における金属イオンの移動を助力することになる。 In the secondary battery of the present invention, an electrode assembly including an electrode constituent layer including a positive electrode, a negative electrode, and a separator is enclosed in an outer package together with an electrolyte. When the positive electrode and the negative electrode have a layer capable of occluding and releasing lithium ions, the electrolyte is preferably a “non-aqueous” electrolyte such as an organic electrolyte and / or an organic solvent (that is, the electrolyte is a non-aqueous electrolyte). Preferably). In the electrolyte, metal ions released from the electrodes (positive electrode and negative electrode) exist, and therefore, the electrolyte assists the movement of the metal ions in the battery reaction.
　非水電解質は、溶媒と溶質とを含む電解質である。具体的な非水電解質の溶媒としては、少なくともカーボネートを含んで成るものが好ましい。かかるカーボネートは、環状カーボネート類および／または鎖状カーボネート類であってもよい。特に制限されるわけではないが、環状カーボネート類としては、プロピレンカーボネート（ＰＣ）、エチレンカーボネート（ＥＣ）、ブチレンカーボネート（ＢＣ）およびビニレンカーボネート（ＶＣ）から成る群から選択される少なくとも１種を挙げることができる。鎖状カーボネート類としては、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート（ＤＥＣ）、エチルメチルカーボネート（ＥＭＣ）およびジプロピルカーボネート（ＤＰＣ）から成る群から選択される少なくも１種を挙げることができる。あくまでも例示にすぎないが、非水電解質として環状カーボネート類と鎖状カーボネート類との組合せが用いられてよく、例えばエチレンカーボネートとジエチルカーボネートとの混合物が用いてよい。また、具体的な非水電解質の溶質としては、例えば、ＬｉＰＦ６および／またはＬｉＢＦ４などのＬｉ塩が好ましく用いられる。 A non-aqueous electrolyte is an electrolyte containing a solvent and a solute. As a specific non-aqueous electrolyte solvent, a solvent containing at least carbonate is preferable. Such carbonates may be cyclic carbonates and / or chain carbonates. Although not particularly limited, 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). Although it is only an illustration to the last, the combination of cyclic carbonate and chain carbonate may be used as a nonaqueous electrolyte, for example, the mixture of ethylene carbonate and diethyl carbonate may be used. In addition, as a specific nonaqueous electrolyte solute, for example, a Li salt such as LiPF 6 and / or LiBF 4 is preferably used.
　二次電池の外装体は、正極、負極及びセパレータを含む電極構成層が積層した電極組立体を包み込むものであるが、ハードケースの形態であってよく、あるいは、ソフトケースの形態であってもよい。具体的には、外装体は、いわゆる“金属缶”に相当するハードケース型であってもよく、あるいは、いわゆるラミネートフィルムから成る“パウチ”に相当するソフトケース型であってもよい。 The outer package of the secondary battery encloses the electrode assembly in which the electrode constituent layers including the positive electrode, the negative electrode, and the separator are laminated, but may be in a hard case form or a soft case form. Good. Specifically, the exterior body may be a hard case type corresponding to a so-called “metal can” or a soft case type corresponding to a “pouch” made of a so-called laminate film.
［本発明の二次電池の特徴］
　本発明の二次電池は、その立体的形状に特徴を有している。具体的には、二次電池の固定のためにその電池の三次元外形が少なくとも１つの窪み部を有している。これは、二次電池を実質的に構成する電極組立体が、その外形として窪み部を含んでいると共に、かかる電極組立体を包囲する外装体の外形もまた窪み部を含んでいることを意味している。 [Characteristics of the secondary battery of the present invention]
The secondary battery of the present invention is characterized by its three-dimensional shape. Specifically, the three-dimensional outer shape of the battery has at least one recess for fixing the secondary battery. This means that the electrode assembly that substantially constitutes the secondary battery includes a recess as its outer shape, and the outer shape of the exterior body that surrounds the electrode assembly also includes the recess. is doing.
　図２～４は、本発明に係る二次電池１００の三次元外形１００’を示している。図示する態様から分かるように、三次元外形１００’においては、その一部が切り欠かれるような形態で“窪み部”１５０が設けられている。“窪み部”１５０の存在に起因して、本発明に係る二次電池１００の外観は局所的に凹凸状を成している。凹凸状といえども、あくまでも三次元外形１００’の一部分のみが切り欠かれた形態ゆえ、二次電池１００の全体的な外観は、切り欠かれる前の形態（即ち、図２～４の下側括弧内に示す形態）が実質的に維持されている。 2 to 4 show a three-dimensional outline 100 'of the secondary battery 100 according to the present invention. As can be seen from the illustrated embodiment, in the three-dimensional outer shape 100 ′, a “recessed portion” 150 is provided in such a form that a part thereof is cut out. Due to the presence of the “dent” 150, the appearance of the secondary battery 100 according to the present invention is locally uneven. Even though it is uneven, only the part of the three-dimensional outer shape 100 ′ is cut out, so that the overall appearance of the secondary battery 100 is the shape before cutting (ie, the lower side of FIGS. 2 to 4). The form shown in parentheses is substantially maintained.
　本明細書において「三次元外形」とは、広義には、二次電池の立体形状を意味しており、狭義には、電極組立体またはそれを包み込む外装体の外観形状を意味している。また、本明細書において「窪み部」とは、二次電池の三次元外形が局所的に凹凸を成すように“凹んだ部分”ないしは“段差を構成する部分”を実質的に意味している。「窪み部」は、三次元外形１００’の一部切り欠きで得られる形態を有しているが、ここでいう“切り欠く”とは、図２～４の下側括弧内に示すように全体として略直方体または略立方体の三次元外形を基準とし、それから一部分が刳り抜かれる又は切り取られることを仮想前提としている。なお、本発明における三次元外形の平面視（特に電池厚み方向に沿って外側から捉えた場合の平面視）では、窪み部は矩形を有することが好ましく、その矩形が長尺形となっていることがより好ましい。 In this specification, “three-dimensional outer shape” means the three-dimensional shape of a secondary battery in a broad sense, and means the outer shape of an electrode assembly or an exterior body that wraps it in a narrow sense. Further, in this specification, the “recessed portion” substantially means a “recessed portion” or “a portion forming a step” so that the three-dimensional outer shape of the secondary battery is locally uneven. . The “recessed portion” has a form obtained by partially cutting out the three-dimensional outer shape 100 ′. The “notched portion” as used herein is as shown in lower brackets in FIGS. The virtual premise is that a three-dimensional outline of a substantially rectangular parallelepiped or a substantially cube as a whole is used as a reference, and then a part is cut out or cut out. In addition, in the plan view of the three-dimensional outer shape in the present invention (particularly, the plan view when viewed from the outside along the battery thickness direction), the hollow portion preferably has a rectangular shape, and the rectangular shape is long. It is more preferable.
　特に、本発明における窪み部は、二次電池が収容される筐体に対して電池固定するための固定部となっている。つまり、二次電池の三次元外形に含まれる窪み部は電池固定部である。図５に示す態様から分かるように、三次元外形１００’の窪み部１５０が筐体２００と係り合うことによって二次電池１００が筐体２００に対して固定化される。より具体的には、三次元外形１００’の窪み部１５０と筐体２００の内壁構造部とが互いに嵌り合うことによって、二次電池１００が筐体２００に対して固定化される。 In particular, the recessed portion in the present invention is a fixing portion for fixing the battery to the casing in which the secondary battery is accommodated. That is, the hollow part included in the three-dimensional outer shape of the secondary battery is a battery fixing part. As can be seen from the aspect shown in FIG. 5, the secondary battery 100 is fixed to the casing 200 by the depression 150 of the three-dimensional outer shape 100 ′ engaging with the casing 200. More specifically, the secondary battery 100 is fixed to the casing 200 by fitting the recess 150 of the three-dimensional outer shape 100 ′ and the inner wall structure of the casing 200.
　二次電池が収容される筐体２００は、図６に示すように、それ自体の構造強度を保つ観点から、梁部２５０が好ましくは設けられている。「梁部」は、いわゆる“ビーム”であって、図示されるように筐体内壁にて連続突起の形態を有している。つまり、例えばノートパソコンの筐体（図６）またはスマートフォンの筐体などのデジタル機器筐体では、局所的に肉厚となった突起部が連続的に延在する形態の梁部２５０が筐体２００の内壁に設けられている。本発明の二次電池では、そのような梁部２５０が入り込むことが可能な窪み部１５０が好ましくは設けられている。これは、三次元外形１００’の窪み部１５０が筐体２００の梁部２５０に位置付けられることで二次電池が筐体に固定化されることを意味している（図５および図７～図９参照）。 As shown in FIG. 6, the case 200 in which the secondary battery is accommodated is preferably provided with a beam portion 250 from the viewpoint of maintaining its structural strength. The “beam portion” is a so-called “beam”, and has a shape of a continuous projection on the inner wall of the housing as shown in the figure. That is, for example, in a digital device casing such as a notebook personal computer casing (FIG. 6) or a smartphone casing, the beam portion 250 having a form in which locally thick protrusions continuously extend is the casing. 200 is provided on the inner wall. In the secondary battery of the present invention, a recess 150 into which such a beam 250 can enter is preferably provided. This means that the secondary battery is fixed to the casing by positioning the depression 150 of the three-dimensional outer shape 100 ′ on the beam section 250 of the casing 200 (FIGS. 5 and 7 to FIG. 7). 9).
　筐体の内壁に設けられる梁部２５０は、あくまでも“梁”であるので、長尺形態で連続的に延在し得る。したがって、そのような梁部２５０が窪み部に好適に入り込むことができるように、窪み部１５０も三次元外形１００’において同様に長尺状に延在していることが好ましい。ここでいう「長尺」とは、広義には、全体として細長いことを意味しており、狭義には、電化製品・デジタル機器などの筐体内の梁部が有する形状の如く細長いことを意味している。また、筐体の梁部と係り合う点でいえば、窪み部の深さ寸法は、二次電池の厚み寸法の半分以上、即ち、その三次元外形の厚み寸法の半分以上であってよい。ある１つの好適な態様では、三次元外形の窪み部の幅寸法が筐体の梁部の幅寸法と同じもしくは略同じになっており、および／または、三次元外形の窪み部の深さ寸法が筐体の梁部の高さ寸法と同じもしくは略同じになっている。 Since the beam portion 250 provided on the inner wall of the housing is merely a “beam”, it can continuously extend in a long form. Therefore, it is preferable that the recess 150 also extends in the same manner in the three-dimensional outer shape 100 ′ so that such a beam portion 250 can suitably enter the recess. The term “long” as used herein means, in a broad sense, an elongated shape as a whole, and, in a narrow sense, means an elongated shape, such as the shape of a beam part in a housing of an appliance or digital device. ing. In terms of the relationship with the beam portion of the housing, the depth of the recess may be at least half the thickness of the secondary battery, that is, at least half the thickness of the three-dimensional outer shape. In one preferred embodiment, the width dimension of the recess portion of the three-dimensional outline is the same as or substantially the same as the width dimension of the beam portion of the housing, and / or the depth dimension of the recess portion of the three-dimensional outline. Is the same as or substantially the same as the height of the beam portion of the housing.
　ある好適な態様では、窪み部１５０は直線状に細長く延在する形態を有している。かかる場合、“矩形”の窪み部の平面視形状は、特に長尺形を有している。本明細書において「平面視形状」とは、二次電池および筐体などの対象物の厚み方向に沿って該対象物を上側または下側から目視した際の輪郭形状を指している。“長尺形”ゆえ、例えばある好適な窪み部１５０は三次元外形の主面にて一定方向に細長く延在している。 In a preferred embodiment, the recess 150 has a shape extending in a straight line. In such a case, the planar view shape of the “rectangular” depression is particularly long. In this specification, the “planar shape” refers to a contour shape when the object is viewed from the upper side or the lower side along the thickness direction of the object such as the secondary battery and the casing. Because of the “elongate shape”, for example, a suitable recess 150 is elongated in a certain direction on the main surface of the three-dimensional outer shape.
　ここで、デジタル機器などの筐体に収容される二次電池１００は、かかる筐体の限られた内部スペースの影響を受けることになり得る。例えば薄型化が意図されたデジタル機器の筐体の内部スペースは、その高さ寸法が比較的小さくなっている。よって、かかる筐体に使用される二次電池の三次元外形１００’は、全体的として薄いことが好ましい。また、筐体の限られた内部スペースにおいては、回路基板および各種部品などの他の機器要素も収納されるので、二次電池のためのスペースが制限を受け得る。特に、筐体自体の平面視形状が全体として矩形となり得ると共に、回路基板および各種部品などの平面視形状も矩形となることが多いので、二次電池のためのスペースの平面視形状も矩形または正方形などの四角形状を取り得ることになる。このような筐体に使用される二次電池は全体として略直方体形となっていることが好ましい。つまり、三次元外形が全体として略直方体となっていることが好ましい（図２～図４参照）。包括的にいえば、本発明の二次電池のある好適な態様では、三次元外形は全体として略直方体となっており（即ち、図２～４の下側括弧内に示される切り欠かれる前の形態を想定した三次元外形は略直方体となっており）、かつ、そのような略直方体の三次元外形に対して窪み部１５０が長尺状に延在している。本明細書では「略直方体」とは、完全な“直方体”に限らず、“立方体状”および“四角錐台状”などを含む六面体形状を包括的に含むものとして用いている。 Here, the secondary battery 100 housed in a housing such as a digital device may be affected by the limited internal space of the housing. For example, an internal space of a casing of a digital device intended to be thin has a relatively small height. Therefore, it is preferable that the three-dimensional outer shape 100 ′ of the secondary battery used in such a casing is thin as a whole. In addition, in the limited internal space of the housing, other device elements such as a circuit board and various parts are also housed, so that the space for the secondary battery can be limited. In particular, the plan view shape of the casing itself can be rectangular as a whole, and the plan view shapes of the circuit board and various components are often rectangular, so the plan view shape of the space for the secondary battery is also rectangular or A square shape such as a square can be taken. It is preferable that the secondary battery used for such a case has a substantially rectangular parallelepiped shape as a whole. That is, it is preferable that the three-dimensional outer shape is a substantially rectangular parallelepiped as a whole (see FIGS. 2 to 4). In general, in a preferred embodiment of the secondary battery of the present invention, the three-dimensional outer shape is generally a rectangular parallelepiped as a whole (that is, before the notch shown in the lower brackets in FIGS. 2 to 4). The three-dimensional outer shape assuming this form is a substantially rectangular parallelepiped), and the recess 150 extends in a long shape with respect to the three-dimensional outer shape of such a substantially rectangular parallelepiped. In the present specification, the “substantially rectangular parallelepiped” is not limited to a complete “cuboid”, but includes a hexahedral shape including “cubic shape” and “quadrangular pyramid shape”.
　図７に示す態様に係る本発明の二次電池１００は、図２に示すように、窪み部１５０が、三次元外形１００’において溝を成している。つまり、三次元外形１００’の主面の一部が低レベル化することで溝形態の窪み部１５０が設けられている。図８および図９に示す態様との相違でいうと、三次元外形１００’の主面のうち周縁を除く領域に窪み部１５０が設けられて溝形態がもたらされている。ここでいう「溝」とは、両サイドが相対的に高いレベルとなることでもたらされる凹部を実質的に意味している。図７に示すように、三次元外形１００’において“溝”として存在する窪み部１５０に対して筐体２００の梁部２５０が挿入されることで、二次電池１００の固定化がなされる。図示する態様から分かるように、溝形態の窪み部１５０と梁部２５０とが互いに嵌合して係合することによって、二次電池１００の筐体２００への固定化がより好適になされ得る。 In the secondary battery 100 of the present invention according to the embodiment shown in FIG. 7, the recess 150 forms a groove in the three-dimensional outer shape 100 ′, as shown in FIG. 2. That is, the groove-shaped depression 150 is provided by lowering a part of the main surface of the three-dimensional outer shape 100 ′. 8 and 9, a recess 150 is provided in a region excluding the peripheral edge of the main surface of the three-dimensional outer shape 100 ′ to provide a groove shape. The term “groove” as used herein substantially means a recess caused by the relatively high level of both sides. As shown in FIG. 7, the secondary battery 100 is fixed by inserting the beam portion 250 of the housing 200 into the recess 150 existing as a “groove” in the three-dimensional outer shape 100 ′. As can be seen from the illustrated embodiment, the groove-shaped depression 150 and the beam 250 are fitted and engaged with each other, whereby the secondary battery 100 can be more suitably fixed to the housing 200.
　一方、図８および図９に示される態様に係る本発明の二次電池１００は、それぞれ図３および図４に示すように、窪み部１５０が三次元外形１００’の周縁部の少なくとも一部を成している。図７と同様に、三次元外形１００’の主面の一部が低レベル化することによって“縁が部分的に切り取られる形態”の窪み部１５０が設けられている。図７に示す態様との相違でいえば、三次元外形１００’の主面領域のうち外周縁の位置に窪み部が設けられ、それによって、段差形態の窪み部１５０がもたらされている。かかる場合、図８および図９に示すように、三次元外形１００’で段差状に存在する窪み部１５０を埋めるように筐体２００の梁部２５０が位置付けられ、二次電池１００の固定化がなされる。図示する態様から分かるように、段差形態の窪み部１５０によって梁部２５０が三次元外形１００’に対して“位置ずれ防止”のストッパーの如く働くので、二次電池１００を好適に筐体２００に固定化できる。 On the other hand, in the secondary battery 100 of the present invention according to the embodiment shown in FIG. 8 and FIG. 9, as shown in FIG. 3 and FIG. 4, respectively, the indentation 150 has at least a part of the peripheral edge of the three-dimensional outer shape 100 ′. It is made. As in FIG. 7, a recess 150 having a form in which an edge is partially cut is provided by lowering a part of the main surface of the three-dimensional outer shape 100 ′. Speaking of the difference from the mode shown in FIG. 7, a recess is provided at the outer peripheral edge in the main surface region of the three-dimensional outer shape 100 ′, thereby providing a step-shaped recess 150. In this case, as shown in FIGS. 8 and 9, the beam portion 250 of the housing 200 is positioned so as to fill the recess 150 existing in a step shape with the three-dimensional outer shape 100 ′, and the secondary battery 100 is fixed. Made. As can be seen from the illustrated embodiment, the beam portion 250 acts as a “position misalignment prevention” stopper with respect to the three-dimensional outer shape 100 ′ by the stepped recess 150, so that the secondary battery 100 is suitably mounted on the housing 200. Can be fixed.
　本発明の二次電池１００は、図１０に示すように、「溝形態の窪み部１５０Ａ」と「段差形態の窪み部１５０Ｂ」との双方を備えていてもよい。つまり、電池が収納される筐体内壁の形態に応じて、三次元外形１００’の主面に「溝形態の窪み部１５０Ａ」と「段差形態の窪み部１５０Ｂ」との双方が設けられていてもよい。２箇所が固定化に寄与するので、より強固な固定化がなされ得ることになる。なお、「溝形態の窪み部１５０Ａ」と「段差形態の窪み部１５０Ｂ」との双方を梁部に係合させる態様に限定されず、例えば「溝形態の窪み部１５０Ａ」のみを筐体の梁部に係合させてよい。デジタル機器などの筐体の周辺部では、その厚さ寸法が漸次減じられている場合がある。かかる漸次減じられている筐体箇所に相当する内部空間に「段差形態の窪み部１５０Ｂ」を位置付ければ、筐体内壁輪郭に沿って二次電池をより好適に収容することができる。つまり、かかる場合においては「段差形態の窪み部１５０Ｂ」と「筐体内壁面」との係合によっても二次電池の固定化がなされ得る。 10, the secondary battery 100 of the present invention may include both a “groove-shaped depression 150A” and a “step-shaped depression 150B”. That is, according to the form of the inner wall of the housing in which the battery is stored, both the “groove-shaped depression 150A” and the “step-shaped depression 150B” are provided on the main surface of the three-dimensional outer shape 100 ′. Also good. Since two places contribute to immobilization, stronger immobilization can be achieved. Note that the present invention is not limited to an embodiment in which both the “groove-shaped depression 150A” and the “step-shaped depression 150B” are engaged with the beam portion. For example, only the “groove-shaped depression 150A” is the beam of the housing. It may be engaged with the part. In the peripheral part of a casing of a digital device or the like, the thickness dimension may be gradually reduced. If the “step-shaped depression 150B” is positioned in the internal space corresponding to such a gradually reduced casing location, the secondary battery can be more suitably accommodated along the casing inner wall contour. That is, in such a case, the secondary battery can be fixed also by the engagement between the “step-shaped recess 150B” and the “inner wall surface”.
　図７に示す形態および図８・図９に示す形態のいずれであっても、窪み部１５０は、三次元外形１００’にて局所的に厚みを減じた部分に相当する。つまり、本発明の二次電池のある好適な態様では、三次元外形の厚み寸法を一部減じるように、窪み部が設けられていることになる。ここでいう「一部減じる」とは、三次元外形の厚みが全く無くなるように窪み部が設けられているのではなく、三次元外形のある局所的領域が、その厚みを少なくとも残しつつも相対的に薄くなっていることを意味している。このように三次元外形の厚み寸法を一部減じる形態の窪み部に対して筐体２００の梁部２５０が係合すると、梁部２５０の側面側だけでなく頂面側にも電池の三次元外形が位置付けられ、より好適な固定化がなされることになる。 7 and the form shown in FIGS. 8 and 9, the recess 150 corresponds to a portion where the thickness is locally reduced in the three-dimensional outer shape 100 ′. That is, in a preferred aspect of the secondary battery of the present invention, the recess is provided so as to partially reduce the thickness dimension of the three-dimensional outer shape. Here, “partially reduce” does not mean that the depression is provided so that the thickness of the three-dimensional outer shape is completely eliminated, but the local region with the three-dimensional outer shape is relatively It means that it is thinner. When the beam portion 250 of the housing 200 is engaged with the hollow portion having a shape in which the thickness dimension of the three-dimensional outer shape is partially reduced, the three-dimensional battery is not only on the side surface side but also on the top surface side of the beam portion 250. The outer shape is positioned, and more suitable immobilization is performed.
　ある好適な態様では、三次元外形の窪み部が、筐体の梁部に対して相補的形状を有している。つまり、窪み部１５０の形状と梁部２５０の形状とが互いに相補的になっている。例えば図７～図９を参照すると分かるように、本発明でいう「相補的形状を有する」とは、断面視の窪み部の輪郭および梁部の輪郭において相互に向かい合う部分が略重なり合う形状を有することを意味している。図示する態様から分かるように、“相補的形状”ゆえ、三次元外形１００’の窪み部１５０と筐体２００の梁部２５０とが互いに密接することができ、二次電池１００を筐体２００により好適に固定化できる。 In a preferred aspect, the recess of the three-dimensional outer shape has a complementary shape with respect to the beam portion of the housing. That is, the shape of the depression 150 and the shape of the beam 250 are complementary to each other. For example, as can be seen with reference to FIGS. 7 to 9, “having a complementary shape” as used in the present invention has a shape in which the portions facing each other in the outline of the hollow part and the outline of the beam part in a sectional view substantially overlap each other. It means that. As can be seen from the illustrated embodiment, because of the “complementary shape”, the recessed portion 150 of the three-dimensional outer shape 100 ′ and the beam portion 250 of the housing 200 can be in close contact with each other. It can be suitably immobilized.
　本発明の二次電池の三次元外形に含まれる“窪み部”は好ましくは電池固定部である（また、換言すれば、二次電池の主面における“窪み部”が電池固定のための局所空間部または隙間部を成しているともいえる）。特に“窪み部”は筐体の梁部と係り合う固定部となっているところ、そのような固定部として好適な特徴を有している。例えば、図２～４に示す形態から分かるように、窪み部１５０は三次元外形１００’の主面において対向する両辺・両エッジにまで及んでいることが好ましい。図２に示す態様でいうと、紙面手前側から紙面奥側へと全体的に貫くように窪み部１５０が延在していることが好ましい。これは、三次元外形の対向する両縁（又は両側面）に至るように窪み部１５０が延在しているといえる。また、電池固定部としての窪み部１５０は、筐体の梁部との係合が意図されているので、三次元外形１００’の対向する主面のうち一方（例えば、電池下面もしくは電池底面に相当する主面）にのみ窪み部１５０が位置付けられていることが好ましい。これは、窪み部が過度に設けられておらず、電池固定化の機能を備えつつも電池容量をより好適に確保できる点で好ましい。 The “recessed portion” included in the three-dimensional outer shape of the secondary battery of the present invention is preferably a battery fixing portion (in other words, the “recessed portion” on the main surface of the secondary battery is a local region for fixing the battery. It can be said that it forms a space or a gap). In particular, the “recessed portion” is a fixing portion that engages with the beam portion of the housing, and has a characteristic suitable as such a fixing portion. For example, as can be seen from the forms shown in FIGS. 2 to 4, it is preferable that the recessed portion 150 extends to both sides and edges facing each other on the main surface of the three-dimensional outer shape 100 '. In the aspect shown in FIG. 2, it is preferable that the recess 150 extends so as to penetrate from the front side of the paper to the back side of the paper. This can be said that the depression 150 extends so as to reach both opposite edges (or both side surfaces) of the three-dimensional outer shape. Further, since the recessed portion 150 as the battery fixing portion is intended to be engaged with the beam portion of the housing, one of the opposing main surfaces of the three-dimensional outer shape 100 ′ (for example, on the battery lower surface or the battery bottom surface). It is preferable that the depression 150 is positioned only on the corresponding main surface). This is preferable in that the recess portion is not excessively provided, and the battery capacity can be more suitably ensured while having a battery fixing function.
　本発明は種々の態様でもって具現化され得る。これにつき例えば以下の態様が挙げられる。 The present invention can be embodied in various forms. For example, the following modes can be cited.
（複数方向延在の窪み部）
　本発明に係る二次電池１００の窪み部１５０は、図１１に示すようなものであってもよい。かかる二次電池１００では、三次元外形１００’に設けられた窪み部１５０が二方向に延在している。つまり、ある方向のみならず、それと異なる別の方向にも延在するように窪み部１５０が設けられている。これにより、筐体梁部の種々の形態に適した窪み部１５０を得ることができる。 (Depressions extending in multiple directions)
The recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG. In such a secondary battery 100, the recess 150 provided in the three-dimensional outer shape 100 ′ extends in two directions. That is, the recess 150 is provided so as to extend not only in a certain direction but also in another direction different from the certain direction. Thereby, the hollow part 150 suitable for the various form of a housing | casing beam part can be obtained.
　図示するように互いに直交する方向に延在する窪み部１５０は、筐体の梁部が同様に直交して延在する部分を含む場合に好適である。図示する態様から分かるように、かかる“複数方向延在の窪み部”は、その平面視形状が、矩形（好ましくは長尺状の矩形）をベースにして、それに他の形状が組み合わされた形状（図示する態様では、略同様の矩形が更に組み合わされた形状）となっているといえる。 As shown in the drawing, the recessed portions 150 extending in the directions orthogonal to each other are suitable when the beam portion of the housing includes a portion extending in the same manner. As can be seen from the embodiment shown in the drawing, such a “multi-directionally extending depression” has a shape in plan view that is based on a rectangle (preferably a long rectangle) and is combined with other shapes. (In the embodiment shown in the figure, it can be said that substantially the same rectangle is further combined).
（異なる主面レベルの形態）
　本発明に係る二次電池１００の窪み部１５０は、図１２に示すようなものであってもよい。かかる二次電池１００では、窪み部１５０が設けられた三次元外形１００’の主面の高さレベルが局所的に異なっている。例えば、図示するように、溝形態の窪み部１５０Ａを境にして、主面の高さレベルが互いに異なっていてよい。 (Different main surface forms)
The recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG. In such a secondary battery 100, the height level of the main surface of the three-dimensional outer shape 100 ′ provided with the recess 150 is locally different. For example, as shown in the drawing, the height levels of the main surfaces may be different from each other with the groove-shaped depression 150A as a boundary.
　デジタル機器などの筐体の周辺部では、その厚さ寸法が漸次減じられている場合がある。それゆえ、主面の高さレベルが局所的に異なる二次電池は、かかる漸次減じられている筐体にとってより好適となり得る。換言すれば、電池の窪み部と筐体の梁部とを相互に係合させると共に、電池の三次元外形の全体的形状（特にその主面）と筐体内壁面とを互いに近位に位置付けることができ（特に好ましくは互いに密接させることができ）、より好適な電池固定化が実現され得る。 In the peripheral part of a housing such as a digital device, the thickness dimension may be gradually reduced. Therefore, a secondary battery having locally different main surface height levels may be more suitable for such a gradually reduced housing. In other words, the recess of the battery and the beam of the casing are engaged with each other, and the overall shape (particularly the main surface) of the battery and the inner wall of the casing are positioned proximal to each other. (Particularly preferably, they can be brought into close contact with each other), and more suitable battery immobilization can be realized.
（完全に切り欠いた形態の窪み部）
　本発明に係る二次電池１００の窪み部１５０は、図１３に示すようなものであってもよい。かかる二次電池１００では、三次元外形１００’に設けられた窪み部１５０が、“完全に切り抜かれた部分”１５０Ｃを有している。つまり、三次元外形の一部分を厚み方向に全て切り欠くように窪み部１５０Ｃが設けられている。かかる“完全に切り欠いた形態”の窪み部１５０Ｃであっても、筐体の内壁に設けられた梁部または突起部と係り合うことができるので（例えば、窪み部１５０Ｃを成す三次元外形の側面と筐体の梁部または突起部とを互いに当接させることができるので）、電池固定化に寄与する。 (Fully cut-out recess)
The recess 150 of the secondary battery 100 according to the present invention may be as shown in FIG. In such a secondary battery 100, the recess 150 provided in the three-dimensional outer shape 100 ′ has a “completely cut-out portion” 150C. That is, the recessed portion 150C is provided so as to cut out a part of the three-dimensional outer shape in the thickness direction. Even such a “completely cut-out” depression 150C can be engaged with a beam or a protrusion provided on the inner wall of the housing (for example, the three-dimensional outer shape forming the depression 150C). Since the side surface and the beam or protrusion of the housing can be brought into contact with each other), this contributes to fixing the battery.
　図示するように、“完全に切り欠いた形態”の窪み部１５０Ｃは、溝形態の窪み部１５０Ａと並設されていてよい（図示する態様では、“完全に切り欠いた形態”の窪み部１５０Ｃと溝形態の窪み部１５０Ａとが横並びで一体化している）。このように“完全に切り欠いた形態”を組み合わせることによって、筐体内壁の種々の形態に応じた窪み部構成が可能となり、設計自由度が増すことになる。 As shown in the drawing, the recess portion 150C having a “fully cut shape” may be arranged in parallel with the recess portion 150A having a groove shape (in the embodiment shown, the recess portion 150C having a “completely cut shape”). And a groove-shaped depression 150A are integrated side by side). In this way, by combining the “completely cut-out form”, it is possible to form a recess according to various forms of the inner wall of the housing, and the degree of freedom in design is increased.
［本発明の電池組合体］
　本発明では、上述した二次電池を備えた電池組合体も提供される。例えば図１４に示されるように、かかる本発明は、二次電池１００とかかる電池を収容する筐体２００との組合せから構成される電池組合体３００である。かかる電池組合体３００においては、二次電池１００が窪み部１５０によって筐体２００に固定される。好ましくは、窪み部１５０と筐体２００の梁部２５０とが相互に係合することによって二次電池１００が固定化される。特に好ましくは、電池組合体において、二次電池の三次元外形の窪み部と筐体の梁部とが互いに相補的形状を有し、二次電池と筐体とが互いにフィットする状態で組み合わされている。 [Battery assembly of the present invention]
In the present invention, a battery assembly including the secondary battery described above is also provided. For example, as FIG. 14 shows, this invention is the battery assembly 300 comprised from the combination of the secondary battery 100 and the housing | casing 200 which accommodates this battery. In such a battery assembly 300, the secondary battery 100 is fixed to the housing 200 by the recess 150. Preferably, the secondary battery 100 is fixed by the recess 150 and the beam 250 of the housing 200 engaging each other. Particularly preferably, in the battery assembly, the recessed part of the three-dimensional outer shape of the secondary battery and the beam part of the housing have a complementary shape to each other, and the secondary battery and the housing are combined in a state of fitting with each other. ing.
　本発明の電池組合体３００は、二次電池１００が筐体２００に固定化されている状態に限らず、固定化前の状態となっていてもよい。つまり、電池組合体３００がいわゆる“キット”の態様を有していてよく、二次電池１００と筐体２００とが別個に供されていてもよい。 The battery assembly 300 of the present invention is not limited to the state in which the secondary battery 100 is fixed to the housing 200, but may be in a state before being fixed. That is, the battery assembly 300 may have a so-called “kit” mode, and the secondary battery 100 and the housing 200 may be provided separately.
　筐体２００は、例えばノートパソコンの筐体（図６）またはスマートフォンの筐体などのデジタル機器筐体であってよい。二次電池１００、その電池の“窪み部”１５０および“筐体の梁部”２５０などについては上記［本発明の二次電池の特徴］で詳述しているので、重複を避けるべくここでの説明は割愛する。なお、本発明の電池組合体は、電池が好適に筐体に固定化されるので、筐体に電池が使用される各種用途において好適に用いられる。 The housing 200 may be a digital device housing such as a laptop computer housing (FIG. 6) or a smartphone housing. The secondary battery 100, the “dent” 150 of the battery, the “beam portion of the casing” 250, etc. are described in detail in the above [Characteristics of the secondary battery of the present invention]. I will omit the explanation. In addition, since the battery is suitably fixed to the casing, the battery assembly of the present invention is preferably used in various applications where the battery is used for the casing.
　以上、本発明の実施形態について説明してきたが、あくまでも典型例を例示したに過ぎない。従って、本発明はこれに限定されず、種々の態様が考えられることを当業者は容易に理解されよう。 As mentioned above, although the embodiment of the present invention has been described, a typical example is merely illustrated. Therefore, those skilled in the art will easily understand that the present invention is not limited to this, and various modes are conceivable.
　本発明に係る二次電池は、蓄電が想定される様々な分野に利用することができる。あくまでも例示にすぎないが、二次電池は、モバイル機器などが使用される電気・情報・通信分野（例えば、携帯電話、スマートフォン、ノートパソコン、デジタルカメラ、活動量計、アームコンピューター、電子ペーパーなどのモバイル機器分野）、家庭・小型産業用途（例えば、電動工具、ゴルフカート、家庭用・介護用・産業用ロボットの分野）、大型産業用途（例えば、フォークリフト、エレベーター、湾港クレーンの分野）、交通システム分野（例えば、ハイブリッド車、電気自動車、バス、電車、電動アシスト自転車、電動二輪車などの分野）、電力系統用途（例えば、各種発電、ロードコンディショナー、スマートグリッド、一般家庭設置型蓄電システムなどの分野）、ならびに、ＩｏＴ分野、宇宙・深海用途（例えば、宇宙探査機、潜水調査船などの分野）などに利用することができる。 The secondary battery according to the present invention can be used in various fields where power storage is assumed. For illustration purposes only, secondary batteries are used in the electrical / information / communication field where mobile devices are used (for example, mobile phones, smartphones, notebook computers, digital cameras, activity meters, arm computers, electronic paper, etc.) Mobile equipment), household / small industrial applications (eg, power tools, golf carts, household / nursing / industrial robots), large industrial applications (eg, forklifts, elevators, bay harbor cranes), transportation System fields (for example, hybrid vehicles, electric vehicles, buses, trains, electric assist bicycles, electric motorcycles, etc.), power system applications (for example, various power generation, road conditioners, smart grids, general home-installed energy storage systems) ), And IoT fields, space and deep sea applications (for example, space)査機, areas such as submersible research vessel) can be used for such.
　１　　　　正極
　２　　　　負極
　３　　　　セパレーター
　１０　　　電極構成層
　１００　　二次電池
　１００’　三次元外形
　１５０　　窪み部
　１５０Ａ　溝形態の窪み部
　１５０Ｂ　段差形態の窪み部
　１５０Ｃ　“完全に切り欠いた形態”の窪み部
　２００　　筐体
　２５０　　筐体の梁部
　２９０　　従来技術の固定化手段
　３００　　電池組合体 DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Negative electrode 3 Separator 10 Electrode structure layer 100 Secondary battery 100 'Three-dimensional external shape 150 Depression 150A Groove-shaped depression 150B Depression-shaped depression 150C "Complete cut-out" depression 200 Case 250 Beam part of housing 290 Fixing means of prior art 300 Battery assembly

Claims (13)

  1. 二次電池であって、
    　前記二次電池の固定のために該二次電池の三次元外形が少なくとも１つの窪み部を含む、二次電池。     A secondary battery,
    A secondary battery in which the three-dimensional outer shape of the secondary battery includes at least one indentation for fixing the secondary battery.
  2. 前記窪み部は、前記二次電池が収容される筐体に対して前記固定するための固定部である、請求項１に記載の二次電池。 The secondary battery according to claim 1, wherein the hollow portion is a fixing portion for fixing the concave portion to a housing in which the secondary battery is accommodated.
  3. 前記窪み部が、前記筐体の梁部に対して相補的形状を有する、請求項１または２に記載の二次電池。 The secondary battery according to claim 1, wherein the hollow portion has a shape complementary to the beam portion of the housing.
  4. 前記窪み部が長尺状に延在する、請求項１～３のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 3, wherein the hollow portion extends in a long shape.
  5. 前記三次元外形が全体として略直方体となっている、請求項１～４のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 4, wherein the three-dimensional outer shape is a substantially rectangular parallelepiped as a whole.
  6. 前記窪み部の平面視形状が矩形または該矩形との組合せ形となっている、請求項１～５のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 5, wherein a shape of the hollow portion in plan view is a rectangle or a combination with the rectangle.
  7. 前記矩形が長尺形である、請求項６に記載の二次電池。 The secondary battery according to claim 6, wherein the rectangle is a long shape.
  8. 前記窪み部が、前記三次元外形の周縁部の少なくとも一部を成している、請求項１～７のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 7, wherein the recess constitutes at least a part of a peripheral edge of the three-dimensional outer shape.
  9. 前記窪み部が、前記三次元外形において溝を成している、請求項１～７のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 7, wherein the hollow portion forms a groove in the three-dimensional outer shape.
  10. 前記二次電池の正極、負極およびセパレータが平面状に積層した平面積層構造を有することを特徴とする、請求項１～９のいずれかに記載の二次電池。 10. The secondary battery according to claim 1, wherein the secondary battery has a planar laminated structure in which a positive electrode, a negative electrode, and a separator of the secondary battery are laminated in a planar shape.
  11. 前記二次電池に設けられた正極材層および負極材層がリチウムイオンを吸蔵放出可能な層であることを特徴とする、請求項１～１０のいずれかに記載の二次電池。 The secondary battery according to any one of claims 1 to 10, wherein the positive electrode material layer and the negative electrode material layer provided in the secondary battery are layers capable of occluding and releasing lithium ions.
  12. 請求項１～１１のいずれかに記載の二次電池と該二次電池を収容する筐体との組合せから構成される電池組合体であって、
    　前記二次電池が前記窪み部により前記筐体に固定される、電池組合体。     A battery assembly comprising a combination of the secondary battery according to any one of claims 1 to 11 and a casing for housing the secondary battery,
    A battery assembly in which the secondary battery is fixed to the housing by the recess.
  13. 前記窪み部と前記筐体の梁部とが相互に係合することによって前記二次電池が前記固定される、請求項１２に記載の電池組合体。 The battery assembly according to claim 12, wherein the secondary battery is fixed by the recess portion and the beam portion of the housing being engaged with each other.
PCT/JP2017/038565 2016-12-21 2017-10-25 Secondary battery and battery module WO2018116623A1 (en)

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