WO2022071084A1 - 蓄電デバイス - Google Patents

蓄電デバイス Download PDF

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Publication number
WO2022071084A1
WO2022071084A1 PCT/JP2021/034963 JP2021034963W WO2022071084A1 WO 2022071084 A1 WO2022071084 A1 WO 2022071084A1 JP 2021034963 W JP2021034963 W JP 2021034963W WO 2022071084 A1 WO2022071084 A1 WO 2022071084A1
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WO
WIPO (PCT)
Prior art keywords
power storage
partition member
storage device
wound
electrode body
Prior art date
Application number
PCT/JP2021/034963
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English (en)
French (fr)
Japanese (ja)
Inventor
賢司 大原
隆 野澤
Original Assignee
ルビコン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by ルビコン株式会社 filed Critical ルビコン株式会社
Priority to JP2022553880A priority Critical patent/JP7691431B2/ja
Publication of WO2022071084A1 publication Critical patent/WO2022071084A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52—Separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/78—Cases; Housings; Encapsulations; Mountings
    • H01G11/82—Fixing or assembling a capacitive element in a housing, e.g. mounting electrodes, current collectors or terminals in containers or encapsulations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G4/00—Fixed capacitors; Processes of their manufacture
    • H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/02—Diaphragms; Separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
    • H01G9/004—Details
    • H01G9/04—Electrodes or formation of dielectric layers thereon
    • H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
    • 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
    • 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 power storage device, and particularly relates to an internal structure of a power storage device suitable as an element (capacitor type power storage device) having a power storage function such as an electric double layer capacitor, an electrolytic capacitor, and various other capacitors.
  • a power storage device suitable as an element (capacitor type power storage device) having a power storage function such as an electric double layer capacitor, an electrolytic capacitor, and various other capacitors.
  • High-voltage products include modular products in which multiple cells (storage elements) are connected in series (for example, products in which multiple elements are connected in series via a substrate, and multiple elements are grouped together and the terminals of each element are projected as they are. 4 terminal type, internal connection type in which multiple elements are connected internally, etc.) are known, but these module products have a large number of parts, the manufacturing process is complicated, and the cost such as processing cost is also high. There are problems that it increases, the profit margin is poor, and the size also increases.
  • Patent Document 1 describes an electric double layer capacitor in which a plurality of tubular conductors are concentrically arranged inside and outside in the radial direction via a separator (see FIG. 4). Further, Patent Document 2 has a bipolar element including three or four electrodes including an intermediate electrode which is not connected to an external terminal, and these electrodes are wound around the three or four separators. High voltage supercapacitors are disclosed (see FIGS. 1 to 3B).
  • the present invention solves the above problem, and the problem is to realize a power storage device that can secure withstand voltage characteristics, and can be made compact and easy to manufacture.
  • the power storage device of the present invention is a power storage device including a winding structure and a housing constituting a storage space for accommodating the winding structure.
  • the structure is an electrically insulating band-shaped partition member having an electrolyte barrier property, which is wound so as to partition the accommodation space into a plurality of accommodation areas, and an embodiment in which each is wound along the partition member.
  • It has a plurality of power storage functional bodies separately arranged in each of the plurality of accommodation areas.
  • the power storage function body includes a first electrode body, a second electrode body, and the first electrode body and the first electrode body, each of which is configured in a band shape wound along the partition member.
  • a separator is provided between the two electrodes.
  • each of the above-mentioned accommodation areas does not have to be a closed area, and may be an area configured to be able to individually accommodate a plurality of power storage functional bodies.
  • the storage space is divided into a plurality of storage areas by an electrically insulating band-shaped partition member having a wound electrolyte blocking property, and a plurality of storage functions are partitioned in each storage area.
  • Each is arranged in a wound manner along the member.
  • the outer edge portion (side edge) of the partition member is outside the winding structure in the axial direction with respect to the first electrode body and the second electrode body belonging to the plurality of power storage function bodies. It is preferable that it protrudes into the. According to this, due to the outer edge portion (side edge) in the width direction of the electrically insulating partition member having the electrolyte blocking property, the radial direction in the outer peripheral portion beyond the outer edge (side edge) in the axial direction of the wound structure. Since electrical leakage can be suppressed, the insulation performance of the device can be improved.
  • the outer edges (both edges) on both sides of the partition member in the width direction are both outside of the first electrode body and the second electrode body in the wound structure in the axial direction.
  • the outer edge portion (end edge) of the partition member is arranged outside the winding structure in the radial direction with respect to the first electrode body and the second electrode body in the winding structure. Is desirable. According to this, it is possible to reduce the electrical leakage in the circumferential direction in the outer peripheral portion beyond the radial outer edge (periphery) of the wound structure by the outer edge portion (end edge) in the extending direction of the partition member. Therefore, the insulation performance can be improved.
  • the wound structure is arranged in the accommodation space, and the outer edge portion (end edge) of the partition member abuts on the radial outer boundary of the accommodation space of the wound structure. Is desirable.
  • the radial inner edge portion of the partition member is arranged on the inner peripheral side in the radial direction with respect to the first electrode body and the second electrode body in the wound structure. .. In this case, it is desirable that the inner edge portion of the partition member abuts (more preferably is fixed) on the inner edge portion of the first separator or the second separator.
  • the partition member is preferably made of synthetic resin.
  • the synthetic resin include polyphenylene sulfide (PPS), polyimide (PI), aramid (total aromatic polyamide), polyetheretherketone (PEEK), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polypropylene ( PP), polyethylene (PE) and the like can be mentioned.
  • PPS polyphenylene sulfide
  • PI polyimide
  • aramid total aromatic polyamide
  • PEEK polyetheretherketone
  • PET polyethylene terephthalate
  • PTFE polytetrafluoroethylene
  • PE polypropylene
  • PE polyethylene
  • the electrolyte and its ions have impermeableness and non-retention.
  • Suitable synthetic resin sheet materials in these respects include polytetrafluoroethylene (PTFE), pafluoroalkoxyalkane (PFA), perfluoroethylenepropene copolymer (FEP), polyfluorovinylidene (PVDF), and ethylene / tetrafluoro.
  • Fluororesin sheets such as ethylene copolymer (ETFE) and polychlorotrifluoroethylene (PCTFE) can be mentioned.
  • the surface of the partition member has a surface having a contact angle of 80 degrees or more with respect to the electrolyte. In particular, it is desirable that the contact angle exceeds 90 degrees (obtuse angle).
  • a plurality of extending portions extending toward the outer peripheral side around the intermediate portion are wound around the intermediate portion in the same direction, respectively, and the accommodating area is formed by the plurality of extending portions. It is preferable that the portions are formed so as to orbit from the inner peripheral portion adjacent to the intermediate portion toward the outer peripheral portion. According to this, since the plurality of accommodating areas are separated at the inner peripheral portion by the plurality of extending portions extending around the intermediate portion of the partition member, the insulation characteristics between the plurality of storage functional bodies are further improved. Will be possible.
  • the partition member (the plurality of extending portions) and the plurality of storage functional bodies are formed rotationally symmetrically about the axis (the intermediate portion) of the wound structure.
  • the electrical symmetry between the plurality of power storage function bodies configured via the partition member can be substantially ensured, so that the durability and the stability of the characteristics can be improved.
  • the first electrode body, the second electrode body, and the separator belonging to the respective power storage function bodies are also centered on the axis (the intermediate portion). It is desirable that it be formed rotationally symmetric.
  • the wound structure has a structure in which the outer peripheral portion of the plurality of power storage function bodies is covered from the outer peripheral side in the radial direction by the outer peripheral portion of the partition member.
  • each power storage function extends to the outer peripheral portion in a state of being sandwiched between the first extending portion and the second extending portion of the partition member, and thus is uniform over the entire length of each storage function body. Since it is possible to realize a stable electrical insulation environment, it is possible to further suppress electrical leakage, so that the insulation performance can be further improved.
  • the outer peripheral portion of the separator interposed between the first electrode body and the second electrode body is more radial than the first electrode body and the second electrode body, respectively.
  • the intermediate portion of the partition member and the inner peripheral end of the separator of the power storage function body are connected to each other.
  • the inner peripheral end of the separator is connected to the intermediate portion, so that the power storage function body is insulated even if it is arranged from the inner peripheral side. Since the characteristics are not deteriorated, the accommodating efficiency of the power storage function can be improved, so that the compactness can be further improved.
  • FIG. 1 It is a perspective view (a) which schematically shows the appearance of 1st Embodiment of a power storage device, and is a perspective view (b) which shows typically an internal winding structure.
  • It is sectional drawing which shows typically the sectional structure of the winding structure of 1st Embodiment.
  • It is explanatory drawing which shows typically the whole structure before winding of the winding structure of 1st Embodiment.
  • It is explanatory drawing (a)-(f) which shows typically the winding process for forming the winding structure of 1st Embodiment.
  • explanatory cross-sectional view (a) schematically showing the radial cross-sectional structure of the accommodating structure in the container of the wound structure of the first embodiment and the explanatory cross-sectional view (b) schematically showing the circumferential cross-sectional structure.
  • FIG. 2 is a cross-sectional view (a) schematically showing a cross-sectional structure of a wound structure of a power storage device according to a second embodiment, and (b) a perspective view schematically showing an overall configuration of the wound structure before winding. ..
  • sectional drawing (a) which shows typically the cross-sectional structure of the winding structure of the power storage device of 4th Embodiment, and explanatory drawing (b) which shows typically the whole structure before winding of the winding structure. .. It is sectional drawing which shows typically the cross-sectional structure of the winding structure of the power storage device of 5th Embodiment.
  • an electric double layer capacitor will be described below as an example of an electric double layer capacitor as a power storage device.
  • FIGS. 1 and 2 the overall configuration of the first embodiment of the power storage device according to the present invention will be described.
  • FIG. 1 is a schematic perspective view (a) of the power storage device 1 of the present embodiment and a perspective view (b) schematically showing a wound capacitor element 2 housed inside the power storage device 1.
  • the power storage device 1 includes a winding type capacitor element 2 in which an electrolyte 5 is introduced (impregnated) into a winding structure 20 having a structure in which a band material (sheet material) is wound, and the winding type capacitor element.
  • a container 3 having a bottomed shape (bottomed tubular shape) for accommodating 2 and a sealing body 4 of the container 3 are provided.
  • the container 3 can be made of a metal such as aluminum.
  • the sealing body 4 is provided with a through hole through which the first external terminal 6 and the second external terminal 7 provided in the wound capacitor element 2 are inserted.
  • the sealing body 4 seals the wound capacitor element 2 housed in the container 3 by the through hole, and has two sets of A and B, the first external terminals 6A and 6B and the second external terminal 7A. , 7B is derived to the outside.
  • the sealing body 4 can be made of various synthetic rubbers, elastomers, and the like.
  • the container 3 and the sealing body 4 constitute a housing.
  • FIG. 2 is a schematic cross-sectional view schematically showing a cross section of the wound structure 20.
  • the winding structure 20 has a band-shaped partition member 21, and the partition member 21 has a first extending portion 21b and a second extending portion 21c on both sides of an intermediate portion 21a in the extending direction.
  • both the first extending portion 21b and the second extending portion 21c are wound around the intermediate portion 21a in a counterclockwise direction in the illustrated example.
  • the storage function bodies 20A and 20B are arranged between the first extending portion 21b and the second extending portion 21c of the partition member 21, respectively.
  • These storage function bodies 20A and 20B have a structure in which the band-shaped first electrode bodies 22A and 22B, the second electrode bodies 23A and 23B, and the separators 24A and 24B arranged between them are laminated.
  • each accommodation area does not have to be a closed area, and may be an area configured to be able to individually accommodate a plurality of power storage function bodies 20A and 20B. More specifically, when considering the intermediate portion 21a as the center, the first extending portion 21b on the inner peripheral side and the second extending portion 21c on the outer peripheral side, which are one of the accommodating regions, A band-shaped power storage function body 20B is arranged in the gap between them.
  • the first electrode body 22B, the separator 24B, and the second electrode body 23B are laminated in order from the inner peripheral side to the outer peripheral side, and are laminated along the partition member 21. , It extends in a manner of being wound from the inner peripheral side to the outer peripheral side.
  • a band-shaped power storage function 20A is arranged in the gap between the second extending portion 21c on the inner peripheral side and the first extending portion 21b on the outer peripheral side, which is the other accommodation area. Will be done.
  • the first electrode body 22A, the separator 24A, and the second electrode body 23A are laminated in order from the inner peripheral side to the outer peripheral side, and are laminated along the partition member 21. , It extends in a manner of being wound from the inner peripheral side to the outer peripheral side.
  • the separators 24A, 24B are located on the inner peripheral side of the inner peripheral ends of the first electrode bodies 22A, 22B and the second electrode bodies 23A, 23B. It is arranged so that the inner peripheral end extends.
  • the outer peripheral ends of the separators 24A and 24B extend toward the outer peripheral side of the outer peripheral ends of the first electrode bodies 22A and 22B and the second electrode bodies 23A and 23B. Arranged in an existing manner.
  • FIG. 2 is only a schematic diagram, and in a mode different from the actual winding state, for example, the reproducibility of the degree of adhesion between each layer is ignored, and the number of windings is significantly reduced in many cases. Please note that it is shown.
  • the outermost circle shown on the outside of the structure is the boundary of the accommodation space of the wound structure 20, which originally corresponds to the container 3 and the holding member 26, that is, the electrolyte 5 is present in the present embodiment. It shows the boundaries of possible spaces. That is, the circle in the figure defines a space having a housing function, a shape maintaining function, an insulating function, and the like, which are required depending on the situation of the wound structure 20 having the above structure. Shown schematically. Therefore, the shape (circular) itself has no meaning and is not limited.
  • the pair of circles shown by the two-dot chain line in the figure is the first electrode bodies 22A and 22B to be conductively connected to the first external terminals 6A and 6B and the second external terminals 7A and 7B shown in FIG. 2, respectively. It shows the approximate position of the joint portion (formation portion of the tab member) of the second electrode bodies 23A and 23B.
  • the drawings attached to the present specification are not limited to FIGS. 1 and 2, and should be understood as a schematic view or a partially enlarged view, and the shape itself drawn in the drawings itself. Does not directly (limitedly) indicate the configuration of the actual embodiment.
  • FIG. 3 schematically shows the arrangement of the partition member 21, the first electrode bodies 22A and 22B, the second electrode bodies 23A and 23B, and the separators 24A and 24B in the unfolded state before winding.
  • the partition member 21 is arranged between the power storage function bodies 20A and 20B.
  • the partition member 21 is configured with a material and a shape (structure) that can reduce the leakage current between the power storage function bodies 20A and 20B as much as possible and secure the withstand voltage characteristics. For this reason, it is preferable that the partition member 21 has an electrolyte blocking property and an electrical insulating property.
  • the partition member 21 has a blocking property that an electrolyte (ion) cannot pass through, and also has an electrical insulating property itself.
  • the partition member 21 is preferably made of synthetic resin.
  • the synthetic resin include polyphenylene sulfide (PPS), polyimide (PI), aramid (total aromatic polyamide), polyetheretherketone (PEEK), polyethylene terephthalate (PET), polytetrafluoroethylene (PTFE), polypropylene ( PP), polyethylene (PE) and the like can be mentioned.
  • the partition member 21 is preferably in the form of a sheet as a preferable form for forming the wound structure 20. Further, when the electrolyte is introduced into the wound structure, it is preferable that the partition member does not allow the electrolyte and its ions to pass through. In particular, it is desirable that the electrolyte and its ions have impermeableness and non-retention. For example, it is composed of a sheet material having no voids. As a result, it becomes possible to further reliably reduce the leakage current through the electrolyte, and further improve the insulation performance of the device.
  • Suitable synthetic resin sheet materials in these respects include polytetrafluoroethylene (PTFE), pafluoroalkoxyalkane (PFA), perfluoroethylenepropene copolymer (FEP), polyfluorovinylidene (PVDF), and ethylene / tetrafluoro.
  • Fluororesin sheets such as ethylene copolymer (ETFE) and polychlorotrifluoroethylene (PCTFE) can be mentioned.
  • the partition member 21 is provided with a surface having a property of repelling the electrolyte.
  • the surface material at this time for example, the above-mentioned fluororesin sheet is preferable.
  • a surface layer having a property of repelling an electrolyte may be formed on the surface by applying a coating or the like.
  • the degree of repelling the electrolyte it is preferable that the contact angle ⁇ with respect to the target electrolyte (liquid) is 80 degrees or more, and in particular, an angle exceeding 90 degrees (obtuse angle) is desirable.
  • the contact angle of the fluororesin is about 100 degrees.
  • the electrolyte is partitioned by the partition member 21. Since it is difficult to exceed the accommodated area (it is difficult to pass through the gap), the effect of improving the insulation characteristics such as reduction of leakage current can be obtained.
  • FIG. 4 is a cross-sectional view schematically showing a more detailed structure of the partition member 21 and the power storage function bodies 20A and 20B, respectively.
  • the partition member 21 is made of a sheet having electrical insulation without gaps as described above. As described above, when the partition member 21 is composed of a synthetic resin sheet, its thickness is required to make it as compact as possible while ensuring electrical insulation and impermeableness of an electrolyte (ion). Is preferably in the range of 5 ⁇ m-1 mm, and particularly preferably in the range of 10 ⁇ m to 500 ⁇ m. In particular, it is more desirable to be in the range of 20 ⁇ m to 200 ⁇ m.
  • the thickness is less than each of the above ranges, the electrolyte and its ions easily pass through, and when the thickness exceeds each of the above ranges, the winding property at the time of manufacturing is deteriorated, which is disadvantageous for making the power storage device compact.
  • the first electrode bodies 22A and 22B of the power storage function bodies 20A and 20B are the current collectors 22A1 and 22B1 made of metal foil and the like, and the second electrode bodies 23A and 23B in the current collectors 22A1 and 22B1. It has polarized electrode layers 22A2 and 22B2 made of a carbon-containing porous material or the like laminated on facing surfaces. Further, in the second electrode bodies 23A and 23B, the current collectors 23A1 and 23B1 made of metal foil or the like and the current collectors 23A1 and 23B1 are laminated on the surfaces facing the second electrode bodies 22A and 23A. It has polar electrode layers 23A2 and 23B2 made of a carbon-containing porous material or the like.
  • the current collectors 22A1, 22B1, 23A1, 23B1 for example, an aluminum foil having a thickness of 20 ⁇ m to 50 ⁇ m can be used.
  • the polarized electrode layers 22A2, 22B2, 23A2, 23B2 for example, activated carbon powder and carbon black are kneaded with a binder to prepare a carbon fine particle-containing paste, and the paste is collected to a thickness of 10 ⁇ m to 200 ⁇ m. It can be configured by applying a coating on the surface of the electric body 22A1,22B1,23A1,23B1 and drying it.
  • separators 24A and 24B for example, a cellulose non-woven fabric having a thickness of 20 ⁇ m to 100 ⁇ m can be used.
  • a cellulose non-woven fabric having a thickness of 20 ⁇ m to 100 ⁇ m can be used.
  • PI polyimide
  • PEEK polyetheretherketone
  • PET polyethylene terephthalate
  • PTFE polytetrafluoroethylene
  • PP polypropylene
  • the material constituting the separator is not limited to the above-mentioned various non-woven fabrics, and may be, for example, made of paper made only of cellulose pulp.
  • a resin adhesive tape such as polypropylene (PP), polyphenylene sulfide (PPS), or polyimide (PI), which has excellent solvent resistance, heat resistance, and insulation performance, is used. Can be done.
  • PP polypropylene
  • PPS polyphenylene sulfide
  • PI polyimide
  • each electrode body (particularly the polarizable electrode layer) and each separator are adhesive layers between the regions partitioned by the partition member 21 so that the adhesive layer does not interfere with the electrical insulation. It is preferable not to connect with each other through the interposition.
  • electrolyte 5 introduced into the winding structure 20 various necessary electrolytes can be used depending on the type of the power storage device.
  • tetraethylammonium salt can be used as a cation
  • boron tetrafluoride, bistrifluoromethylsulfonylimide or the like can be used as an anion.
  • a liquid or gel-like electrolyte can be used as the electrolyte at this time.
  • the electrolytes include boric acid, adipic acid, maleic acid, benzoic acid, phthalic acid, salicylic acid, ammonia, triethylamine, tetramethylammonium hydroxide and the like.
  • a solid electrolyte such as manganese dioxide or an organic semiconductor, or a conductive solid such as a conductive polymer or another (for example, a conductive inorganic material) can be used.
  • FIG. 5 is a schematic process diagram (a) to (f) schematically showing a process of forming the wound structure 20.
  • the partition member 21 and the power storage arranged on both the front and back surfaces thereof are arranged between the core members 10 (a pair of cores 10a and 10b) configured so as to be separable.
  • the functional bodies 20A and 20B are arranged.
  • the partition member 21 and the power storage function bodies 20A and 20B can be fed out by a left and right tape supply system (a supply mechanism including a supply reel with a rotation resistance applying mechanism, a tension roller, a guide roller, etc., the same applies hereinafter). Is held in. After that, as shown in FIG.
  • the intermediate portion 21a of the partition member 21 is sandwiched between the pair of winding cores 10a and 10b, and the winding core material 10 is rotated as shown in FIG. 5C.
  • the intermediate electrode body 21 can be wound around the intermediate portion 21a sandwiched between the winding core materials 10.
  • the power storage function bodies 20A and 20B are fed out by the left and right tape supply systems (not shown) according to the rotation of the winding core material 10 so that the power storage function bodies 20A and 20B supplied from the left and right are involved.
  • the holding member (winding tape) 26 is attached (attached) to the outermost layer to hold the wound state.
  • the first external terminals 6A and 6B and the second external terminals 7A and 7B correspond to the first electrode bodies 22A and 22B and the second. It is inserted into the through hole of the sealing body 4 in a state of being conductively connected to the electrode bodies 23A and 23B of the above by connecting them via a tab member or the like (not shown). Then, the wound structure 20 is housed in the container 3 in a state of being impregnated with the electrolytic solution as, for example, the electrolyte 5, and finally, the opening of the container 3 is sealed with the sealing body 4. In the winding step shown in FIG.
  • the first electrode bodies 22A, 22B, the second electrode bodies 23A, 23B, and the separators 24A, 24B of the power storage function bodies 20A, 20B are previously (before winding). It may be integrated in a laminated state and wound together with the partition member 21. Further, in advance (before winding), the power storage function 20A is integrated on one surface of the first extending portion 21b of the partition member 21, and / or the other of the second extending portions 21c. The power storage function 20B may be integrated on the surface and the winding step may be carried out.
  • FIG. 6A and 6B are schematic structural cross-sectional views (a) and (b) schematically showing the overall configuration of the power storage device 1 of the present embodiment formed as described above.
  • FIG. 6A schematically shows the relative positional relationship in the radial direction of the winding structure 20 (internal structure) of the power storage device 1
  • FIG. 6B is the winding of the power storage device 1.
  • the relative positional relationship around the axis (circumferential direction) of the structure 20 (internal structure) is schematically shown.
  • a first electrode body 22A and each of them are arranged in a region partitioned by the partition member 21.
  • the first storage function body 20A having a portion where the second electrode body 23A faces each other via the separator 24A, and the first electrode body 22B and the second electrode body 23B face each other via the separator 24B.
  • a second storage function body 20B configured by the portion is provided. Since these two sets of storage function bodies 20A and 20B are connected to the first external terminals 6A and 6B and the second external terminals 7A and 7B, respectively, the two sets of storage function bodies correspond to each other. It is formed with the external terminal of.
  • These two sets of power storage function bodies 20A and 20B can be connected in series or in parallel via a pair of external terminals of each set, but in particular, a mode of use. Is not limited.
  • the present embodiment is an electric double layer capacitor that stores electric charges using the electric double layer generated at the interface between the electrode bodies 22A, 22B, 23A, 23B and the electrolyte 5 as a dielectric, but the above structure is an electric double layer capacitor.
  • Other capacitors can be configured in the same manner.
  • the first extending portion 21b and the second extending portion 21c on both sides of the intermediate portion 21a of the strip-shaped partition member 21 are wound in the same direction.
  • the two storage function bodies 20A and 20B arranged between the first extending portion 21b and the second extending portion 21c are accommodated in the accommodating area partitioned by the partition member 21 from each other.
  • the power storage function bodies 20A and 20B arranged in the accommodation area partitioned by the partition member 21 are not configured to overlap each other on the inside and the outside in the radial direction, the power storage function body 20A and the power storage function body 20A and the power storage function body 20B are not configured to overlap each other.
  • the functional body 20B and the functional body 20B there is no relationship between the functional body 20B and the functional body 20B so that one of them is arranged inside and the other is arranged outside when viewed in the radial direction. That is, in the wound structure 20 of the present embodiment, the first electrode bodies 22A, 22B and the second electrode bodies 23A, 23B are alternately or in parallel in an angular range around the intermediate portion 21a. By arranging in, it is possible to relax structural and arrangement restrictions between a plurality of power storage function bodies, and it is possible to reduce the bias of structural symmetry in the radial direction. Further, the first power storage function body 20A and the second power storage function body 20B are wound around the intermediate portion 21a on both sides in the same direction in the first extending portion 21b and the second extending portion 21c, respectively.
  • a plurality of storage function bodies (a laminated body in which a first electrode body and a second electrode body are laminated via a separator) are developed by developing the conventional technology. Since it can be wound and manufactured, it is easy to manufacture and the number of parts is small.
  • the first extending portion 21b, the second extending portion 21c, and the first storage function body are centered on the intermediate portion 21a of the partition member 21. It is preferable that the 20A and the second storage function body 20b are formed in rotational symmetry. As a result, the first power storage function body 20A and the second power storage function body 20B are provided with substantially the same structure in the same accommodation space, and therefore, between the pair of power storage function bodies. The electrical symmetry can be substantially guaranteed. With the above configuration, even when a plurality of power storage functions are connected in series, the bias of the applied voltage and the like can be reduced, so that the durability and characteristic stability of the power storage device can be improved.
  • the characteristic difference becomes large due to the structural problem that the arrangement and dimensions in the radial direction are different among the plurality of power storage function units, so that the durability and the characteristic stability are improved. Problems are more likely to occur. For example, if the leakage current is significantly different between the storage function units, the voltage variation becomes large as the voltage application time elapses due to the influence of self-discharge. As a result, in the storage function unit with a small leakage current, the voltage increases with the passage of the voltage application time, and finally rises to the decomposition voltage of the solvent, and there is a risk that problems such as gas generation and resistance increase occur.
  • the leakage current may increase due to a short circuit between the electrodes due to the electrolyte. This increase in leakage current also becomes a factor that further deteriorates the above-mentioned durability, characteristic stability, or withstand voltage characteristic.
  • the first power storage functions 20A and 20B are mutually arranged in separate storage areas partitioned by the electrically insulating partition member 21 having an electrolyte blocking property. Since they are arranged in parallel on both sides of the intermediate portion 21a in a swirling manner, it is easy to make the characteristics uniform and balanced among these storage function bodies.
  • the partition member 21 and the two power storage function bodies 20A and 20B in rotational symmetry with the intermediate portion 21a as the center, the characteristics of both power storage function bodies can be balanced. As a result, it becomes difficult for the voltage to concentrate on one side, which greatly improves durability and stability of characteristics. In this case, it is more effective if the electrode bodies 22A, 22B, 23A, 23B and the separators 24A, 24B inside the power storage function bodies 20A, 20B are also configured to be rotationally symmetric with each other.
  • each of the storage function bodies 20A and 20B has a structure arranged between the first extending portion 21b and the second extending portion 21c of the partition member 21 from the inner peripheral portion to the entire outer peripheral portion. Become. Therefore, since each of the power storage function bodies 20A and 20B is placed in the same insulating environment over the entire length from the inner peripheral portion to the outer peripheral portion, electrical leakage can be further reduced and the insulating characteristics can be improved.
  • the outer edge portion of the partition member 21 is partitioned by the electrically insulating partition member 21 having an electrolyte blocking property.
  • the side edge 21e is arranged outside the first electrode bodies 22A and 22B and the second electrode bodies 23A and 23B in the axial direction (upper and lower direction shown in FIG. 6) of the wound structure 20.
  • the electrical insulation between the power storage function bodies 20A and 20B can be enhanced.
  • the side edges 21e are arranged on both outer sides (both upper and lower sides in the drawing) in the axial direction of the wound structure 20, the insulating characteristics can be further improved.
  • the end edges 21be and 21ce which are the outer edges of the outer peripheral portion of the partition member 21 in the winding direction, have a winding structure more than the first electrode bodies 22A and 22B and the second electrode bodies 23A and 23B.
  • the outer edge portion (side edge 21e or end edge 21be, 21ce) of the partition member 21 is the winding. It is desirable to abut on the boundary outside the axial direction or the radial direction of the accommodation space of the structure in order to further improve the insulation characteristics. Further, it is more desirable that the state of contact is fixed by adhesion or the like.
  • FIG. 6 shows that the outer peripheral portion of the wound structure 20 is covered with the holding member 26 and the inner surface of the container 3 is arranged outside the holding member 26 as a configuration of the accommodation space. It shows only a schematic configuration, and even if the configuration of the outer peripheral portion as shown in the figure is used, it is only an example.
  • FIG. 6 is a schematic diagram, the features of the radial arrangement mode of the partition member 21, the power storage function bodies 20A and 20B are partially illustrated in an aspect that does not match the cross-sectional structure shown in FIG. Please note that it is only.
  • FIG. 7 This second embodiment is the same as the first embodiment in that it is a wound capacitor element, and the overall configuration and cross-sectional structure of the wound structure 20'shown in FIG. 7 are basically wound structures. Since it can be configured in the same manner as in 20, the same reference numerals are given to the parts that can be configured in the same manner, and the description thereof will be omitted.
  • the structure of the partition member 21 is basically the same as that of the first embodiment, but in the power storage function bodies 20A'and 20B', the second electrode The structure is such that the first electrode bodies 22A'and 22B'face each other on both the front and back sides of the bodies 23A and 23B via the separators 24A'and 24B'.
  • the length of the first electrode bodies 22A', 22B'and the separators 24A', 24B'in the winding direction is more than twice the length of the second electrode bodies 23A, 23B in the winding direction.
  • the intermediate portion of the first electrode bodies 22A', 22B'and the separators 24A', 24B' is configured near the central portion of the wound structure 20'as shown in FIG. 7 (b).
  • the second electrode bodies 23A and 23B are folded back so as to wrap around the inner peripheral ends.
  • the second electrode bodies 23A and 23B are different from the first embodiment, and in this second embodiment, the polarizable electrode layers 23A2 and 23B2 are laminated on both the front and back sides of the current collectors 23A1 and 23B1. Is preferable.
  • the first electrode bodies 22A'and 22B' have the polarizable electrode layers 22A2 only on the surface facing the second electrode bodies 23A and 23B via the separators 24A and 24B on the current collectors 22A1 and 22B1.
  • 22B2 may be laminated.
  • the first electrode bodies 22A'and 22B' are connected to the front and back surfaces of the second electrode bodies 23A and 23B via the separators 24A' and 24B'. Since they are configured to face each other, the electric capacity can be increased by increasing the facing area between the electrodes while maintaining compactness.
  • at least one of the above-mentioned separators 24A ′ and 24B ′ and the first electrode bodies 22A ′ and 22B ′ may be cut at the folded inner peripheral end portion.
  • the separators 24A'and 24B' are extended so as to extend to the inner peripheral side of the inner peripheral ends of the second electrode bodies 23A and 23B to secure insulation between the two electrode bodies. Is desirable.
  • the structure of the partition member 21 in the wound structure 20 ′′ is the same as that in the first embodiment, but the first electrode bodies 22A ′′, 22B ′′ in each power storage function body 20A ′′, 20B ′′.
  • the laminated body of the second electrode bodies 23A ′′, 23B ′′ and the separators 24A ′′, 24B ′′ is in a state of being folded back at the intermediate portion adjacent to the intermediate portion 21a of the partition member 21, and the inner and outer double laminated bodies thereof are in a state of being folded back. It is configured to extend to the outer peripheral side. Since configurations other than the above can be configured in the same manner as in the first embodiment or the second embodiment, the same reference numerals are given to the portions that can be similarly configured. , The description thereof is omitted.
  • the separators 24A ′′, 24B ′′ in the current collector are opposed to each other via the separators 24A ′′, 24B ′′ in the current collector. If the polar electrode layer is formed, the non-opposed region of the polar electrode layer can be reduced as described above. Further, as in the second embodiment, the electric capacity can be increased by increasing the facing area between the electrodes while maintaining the compactness. In this embodiment, at least one of the above-mentioned separators 24A ′′, 24B ′′, the first electrode bodies 22A ′′, 22B ′′, and the second electrode bodies 23A ′′, 23B ′′ is folded back. The structure may be cut at the end.
  • the separators 24A ′′ and 24B ′′ are extended so as to extend to the inner peripheral side of the inner peripheral end of the second electrode bodies 23A ′′ and 23B ′′ to provide insulation between the two electrode bodies. It is desirable to secure it.
  • the partition member 31 in the wound structure 30 has three extending portions 31b, 31c, 31d branched from the intermediate portion 31a, and each extending portion 31b, 31c and 31d have a structure in which they are wound in the same direction.
  • the partition member 31 may be configured so that four or more extending portions branch from the intermediate portion, and the power storage function body may be arranged in each accommodating area partitioned by the partition member.
  • the winding step is performed in a state where the laminated structure of each power storage function is fixed in advance, or in a state where each power storage function is fixed in advance to each of the extending portions 31b, 31c, 31d of the partition member 31. You may do it.
  • the partition members 21 and 31 are configured as one or connected to each other, but the inside of the wound structures 20 and 30 is divided into two or more. It may be arranged in a wound state in.
  • the winding structure 30 may be formed by winding each storage function body in a state of being arranged between the three partition members.
  • the separators 24A and 24B are fixed to the intermediate portion 21a of the partition member 21 similar to the first embodiment by adhesion or the like from both the front and back sides, respectively, and the first electrode bodies 22A are fixed on both sides of the separators 24A and 24B. , 22B and the second electrode bodies 23A and 23B are wound in a laminated state to form the winding structure 20.
  • Other configurations can be configured in exactly the same manner as in the first embodiment.
  • the insulation between the first electrode bodies 22A and 22B and the second electrode bodies 23A and 23B is improved. Since it can be reliably secured, the insulating characteristics of the wound structure 20 can be improved. It should be noted that such a structure can be applied between the partition member and the separator according to any of the first to fourth embodiments described above. Further, in this embodiment, as shown by the dotted line in FIG. 10, the separators 24A and 24B are further extended to the outer peripheral side so as to be in contact with (fixed) to the boundary of the accommodation space, and the insulation characteristics are further enhanced. It doesn't matter.
  • the power storage device of the present invention is not limited to the above-mentioned illustrated examples, and it goes without saying that various changes can be made within a range that does not deviate from the gist of the present invention.
  • the internal structure of the wound structure is an electrolytic capacitor by forming an insulating film such as an oxide film on the surface of each electrode body. It is obvious to those skilled in the art that it can be easily applied to the above.
  • the internal structure according to the present invention can be applied to various capacitor-type power storage devices such as various other capacitors.
  • the internal structure according to the present invention can also be applied to a chemical power storage device such as a battery.
  • the configuration (or feature points) of each part of each of the above embodiments can be configured in any combination as long as there is no particular problem.
  • each of the plurality of sets of the first external terminal and the second external terminal is provided, and the first external terminal and the second set of the first external terminal and the second set corresponding to each of the plurality of power storage functional bodies are provided. It is conductively connected to the external terminal of.
  • the power storage device according to the present invention may include a first external terminal and a second external terminal to which a plurality of power storage functions are commonly conductively connected.
  • a set of first external terminals may be provided.
  • a plurality of power storage functions may be conductively connected in series or in parallel to the terminal and the second external terminal.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)
PCT/JP2021/034963 2020-09-30 2021-09-24 蓄電デバイス WO2022071084A1 (ja)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59101433U (ja) * 1982-12-24 1984-07-09 日本電気株式会社 電気二重層コンデンサ
JP2006278266A (ja) * 2005-03-30 2006-10-12 Sanyo Electric Co Ltd 扁平巻回電極体を備えた電池及びその製造方法
JP2013149390A (ja) * 2012-01-17 2013-08-01 Toyota Industries Corp 蓄電装置、蓄電装置が搭載された車両及び蓄電装置の製造方法
JP2013153013A (ja) * 2012-01-24 2013-08-08 Tdk Corp 蓄電装置及び蓄電装置用電極

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59101433U (ja) * 1982-12-24 1984-07-09 日本電気株式会社 電気二重層コンデンサ
JP2006278266A (ja) * 2005-03-30 2006-10-12 Sanyo Electric Co Ltd 扁平巻回電極体を備えた電池及びその製造方法
JP2013149390A (ja) * 2012-01-17 2013-08-01 Toyota Industries Corp 蓄電装置、蓄電装置が搭載された車両及び蓄電装置の製造方法
JP2013153013A (ja) * 2012-01-24 2013-08-08 Tdk Corp 蓄電装置及び蓄電装置用電極

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