WO2022024785A1 - Cell constituent element, storage cell, assembled cell, and electric vehicle - Google Patents

Cell constituent element, storage cell, assembled cell, and electric vehicle Download PDF

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Publication number
WO2022024785A1
WO2022024785A1 PCT/JP2021/026644 JP2021026644W WO2022024785A1 WO 2022024785 A1 WO2022024785 A1 WO 2022024785A1 JP 2021026644 W JP2021026644 W JP 2021026644W WO 2022024785 A1 WO2022024785 A1 WO 2022024785A1
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WO
WIPO (PCT)
Prior art keywords
separator
negative electrode
foot
battery
electrode plate
Prior art date
Application number
PCT/JP2021/026644
Other languages
French (fr)
Japanese (ja)
Inventor
智紀 武部
Original Assignee
昭和電工マテリアルズ株式会社
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Publication date
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Publication of WO2022024785A1 publication Critical patent/WO2022024785A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/06—Lead-acid accumulators
    • H01M10/12—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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/112—Monobloc comprising multiple compartments
    • H01M50/114—Monobloc comprising multiple compartments specially adapted for lead-acid cells
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H01M50/466—U-shaped, bag-shaped or folded
    • 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

  • This disclosure relates to battery components, storage batteries, assembled batteries and electric vehicles.
  • Patent Document 1 discloses a method for manufacturing an electrode plate containing a bag separator.
  • the electrode plate is sandwiched by bending the separator.
  • a bag-shaped separator is provided by forming a plurality of welded portions on the separator.
  • An object of one aspect of the present disclosure is to provide battery components, storage batteries, assembled batteries and electric vehicles capable of satisfactorily preventing damage to the separator.
  • the battery components according to one aspect of the present disclosure include a first electrode plate and a separator that overlap each other in the first direction, and the first electrode plate is along a second direction orthogonal to the first direction with the main body portion. It has a foot portion that protrudes from the main body and is covered with a separator, and the separator has a base portion having a first thickness and a thick portion having a second thickness thicker than the first thickness and abutting on the foot portion. And prepare.
  • the foot of the first electrode plate is covered with a separator. Therefore, for example, when the first electrode plate is housed in the battery case, the load tends to be concentrated on the portion of the separator that comes into contact with the foot portion.
  • the thick portion of the separator abuts on the foot portion. As a result, the load-bearing performance of the portion of the separator that comes into contact with the foot portion is satisfactorily improved. Therefore, according to the above aspect, damage to the separator can be satisfactorily prevented.
  • the separator further comprises a first main surface facing the first electrode plate, the thick portion has a first rib projecting from the first main surface toward the first electrode plate, and the first rib is a foot. It may come into contact with the portion. In this case, it becomes difficult for the base of the separator to come into contact with the foot.
  • the thick portion may have a plurality of first ribs, and the foot portion may abut on two or more first ribs. In this case, the base of the separator is less likely to come into contact with the foot.
  • the separator may further include a second main surface located on the opposite side of the first main surface, and the thick portion may have a second rib protruding from the second main surface to the opposite side of the first rib.
  • the first part and the second part of the separator are joined to each other, and each of the first part and the second part may face the foot part in the second direction. In this case, the foot is less likely to be exposed from the separator.
  • the first part and the second part may be welded to each other.
  • the first portion and the second portion can be firmly joined.
  • the dimensions of the first portion and the second portion in the third direction orthogonal to the first direction and the second direction may be equal to or larger than the dimensions of the foot portion in the third direction. In this case, the foot portion is less likely to be exposed except at the portion where the first portion and the second portion are joined in the separator.
  • the separator may be folded back on the foot side of the first electrode plate in the second direction.
  • the foot can be well covered by the folded portion of the separator.
  • the separator may have an opening located on the foot side of the first electrode plate in the second direction. For example, when the battery component and the electrolytic solution are housed in the battery case, the electrolytic solution tends to flow in the battery component.
  • the corners of the foot may be chamfered. In this case, it is possible to suppress the load concentration from the foot portion to a specific portion of the thick portion, as compared with the embodiment in which the foot portion is provided with an unchamfered angle, for example.
  • the thickness of the foot in the first direction is smaller than the thickness of the maximum thickness of the first electrode in the first direction, and the foot is located between one end and the other end of the first electrode in the first direction. You may. For example, when the battery component is laid down and the battery component is transported by using a transport device such as a belt conveyor, the foot portion is separated from the transport device. Therefore, it becomes difficult for the separator to be sandwiched between the foot and the transport device. Therefore, it is possible to suppress damage to the separator caused by the foot during transportation of the battery component.
  • the storage battery includes the battery component and an electric tank in which the battery component is housed, and the battery component is laminated on the first electrode plate via a separator in the first direction.
  • the second electrode plate is further provided, and the thick portion is sandwiched between the foot portion and the bottom portion of the battery case.
  • This storage battery includes battery components that can satisfactorily prevent breakage of the separator.
  • the separator is less likely to be damaged when the battery components are housed in the battery case. Therefore, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate that are laminated with each other via the separator.
  • the battery case has a clasp that is provided on the bottom and protrudes along the second direction, and the thick portion may be sandwiched between the foot and the clasp. In this case, damage to the separator is suppressed by sandwiching the thick portion between the foot portion and the bracket.
  • the size of the foot in the first direction and the third direction orthogonal to the second direction may be larger than the size of the clasp in the third direction.
  • the load is less likely to be concentrated from the foot portion to the specific portion of the bracket, so that the thick portion is less likely to be damaged satisfactorily.
  • the size of the foot in the first direction and the third direction orthogonal to the second direction may be less than or equal to the size of the clasp in the third direction. In this case, even if the position of the battery component in the battery case is displaced, the thick portion is likely to be sandwiched between the foot portion and the bracket.
  • the above storage battery may be a lead storage battery.
  • the assembled battery according to one aspect of the present disclosure includes the above-mentioned storage battery.
  • the assembled battery comprises a storage battery that includes battery components that can satisfactorily prevent breakage of the separator. Therefore, in the storage battery, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate laminated with each other via the separator.
  • the electric vehicle according to one aspect of the present disclosure is equipped with the above-mentioned assembled battery.
  • This electric vehicle comprises a storage battery that includes a battery component that can satisfactorily prevent breakage of the separator. Therefore, in the storage battery, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate laminated with each other via the separator.
  • a battery component a storage battery, an assembled battery and an electric vehicle capable of satisfactorily preventing damage to the separator.
  • FIG. 1 is a perspective view showing a part of the storage battery according to the embodiment broken.
  • FIG. 2 is a plan view showing a negative electrode according to an embodiment.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • FIG. 4A is a plan view showing a separator sheet
  • FIG. 4B is a schematic cross-sectional view taken along the line IVb-IVb of FIG. 4A.
  • 5A is a plan view showing the bottom of the main body
  • FIG. 5B is a schematic cross-sectional view taken along the line Vb-Vb of FIG. 5A
  • FIG. c) is a schematic cross-sectional view taken along the line Vc-Vc of FIG. 5 (a).
  • FIG. 5A is a plan view showing the bottom of the main body
  • FIG. 5B is a schematic cross-sectional view taken along the line Vb-Vb of FIG. 5A
  • FIG. c) is a schematic cross-sectional view taken along
  • FIG. 6 is a plan view showing a negative electrode wrapped in a separator.
  • FIG. 7A is an enlarged view of the region surrounded by the alternate long and short dash line shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line VIIb-VIIb of FIG. 7A.
  • Is. 8 (a) is a cross-sectional view taken along the line VIIIa-VIIIa of FIG. 7 (a)
  • FIG. 8 (b) is a cross-sectional view taken along the line VIIIb-VIIIb of FIG. 7 (a). It is a figure.
  • FIG. 9 is an enlarged cross-sectional view of a main part of the storage battery.
  • FIG. 9 is an enlarged cross-sectional view of a main part of the storage battery.
  • FIG. 10A is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the first modification
  • FIG. 10B is an enlarged cross-sectional view of the main part of the separator and the negative electrode according to the second modification.
  • FIG. 11 is a plan view showing a negative electrode wrapped in the separator according to the third modification.
  • FIG. 1 is a perspective view showing a part of the storage battery according to the present embodiment broken.
  • the storage battery 1 is, for example, a control valve type lead storage battery.
  • the storage battery 1 is used, for example, as a battery of an automobile, a backup power source used in the event of a power failure, and a main power source of an electric vehicle (or an electric vehicle) such as an electric forklift.
  • an assembled battery composed of a plurality of storage batteries 1 may be used.
  • the electric vehicle may have an assembled battery including a plurality of storage batteries 1.
  • the storage battery 1 is, for example, a clad-type lead-acid battery provided with a clad-type electrode.
  • the storage battery 1 includes an electrode group 3, a positive electrode terminal 5A, a negative electrode terminal 5B, a water tap 6, and a case 7.
  • the electrode group 3 has a plurality of positive electrodes 10, a plurality of negative electrodes 12, and a plurality of separators 13.
  • the positive electrode 10 and the negative electrode 12 are arranged alternately.
  • a separator 13 is interposed between the adjacent positive electrode 10 and the negative electrode 12. Therefore, the positive electrode 10 is laminated on the negative electrode 12 via the separator 13.
  • the negative electrode 12 is arranged at the end of the positive electrode 10, the negative electrode 12, and the separator 13 in the arrangement direction (hereinafter, may be simply referred to as “arrangement direction” or “stacking direction”).
  • arrangement direction hereinafter, may be simply referred to as “arrangement direction” or “stacking direction”.
  • each of the positive electrode 10, the negative electrode 12, and the separator 13 is also referred to as a battery component.
  • the direction (stacking direction) in which the plurality of positive electrodes 10, the plurality of negative electrodes 12, and the plurality of separators 13 overlap each other is referred to as the first direction X.
  • the direction orthogonal to the first direction X is referred to as the second direction Y
  • the direction orthogonal to the first direction X and the second direction Y is referred to as the third direction Z.
  • the second direction Y corresponds to the direction in which the electrode group 3 is housed in the case 7.
  • the second direction Y and the third direction Z are orthogonal to each other, but the present invention is not limited to this.
  • the second direction Y and the third direction Z may intersect with each other.
  • the positive electrode 10 (second electrode plate) is, for example, a clad type positive electrode plate.
  • the positive electrode 10 has a tubular electrode group 14.
  • the tubular electrode group 14 has a plurality of tubular electrodes 15.
  • the plurality of tubular electrodes 15 are arranged in a row.
  • Each of the plurality of tubular electrodes 15 has, for example, a clad tube, a core metal inserted in the clad tube, and a positive electrode material filled between the clad tube and the core metal.
  • the clad tube is a tubular porous tube also called a gauntlet, and is formed of, for example, glass, resin, or the like.
  • the positive electrode material may contain a positive electrode active material and an additive.
  • the positive electrode active material is, for example, lead powder, lead tan, or the like. Examples of the additive include carbon materials, reinforcing short fibers and the like.
  • the positive electrode active material after chemical conversion is, for example, lead dioxide or the like.
  • FIG. 2 is a plan view showing a negative electrode according to an embodiment.
  • the negative electrode 12 (first electrode plate) is a negative electrode plate having a negative electrode lattice body 12a and a selvage portion 12b.
  • the negative electrode grid body 12a is the main body portion of the negative electrode 12, and holds the negative electrode material 12c.
  • the thickness of the portion of the negative electrode 12 where the negative electrode material 12c is held is larger than the thickness of the negative electrode grid 12a, but is not limited to this.
  • the negative electrode material 12c may contain a negative electrode active material and an additive.
  • the negative electrode active material is, for example, spongy lead or the like.
  • Examples of the additive include barium sulfate, a carbon material, and reinforcing short fibers.
  • the selvage portion 12b is a terminal portion protruding from the negative electrode grid body 12a along the second direction Y.
  • the selvage portion 12b and the negative electrode grid body 12a do not overlap each other in the arrangement direction.
  • the negative electrode grid 12a is covered with the separator 13.
  • the negative electrode lattice body 12a is provided with convex portions 12d and 12e.
  • the convex portions 12d and 12e are foot portions that are arranged at predetermined intervals and project outward from the negative electrode grid body 12a.
  • the convex portions 12d and 12e project along the direction opposite to the projecting direction of the selvage portion 12b.
  • the protruding direction of the selvage portion 12b and the protruding direction of the convex portions 12d and 12e are orthogonal to the arrangement direction, respectively. Further, the selvage portion 12b and the negative electrode lattice body 12a do not overlap each other in the arrangement direction.
  • FIG. 3 is a cross-sectional view taken along the line III-III of FIG.
  • the convex portion 12d is located between one end A1 and the other end A2 of the negative electrode lattice body 12a in the first direction X.
  • the convex portion 12d has a tip surface 12f, a first side surface 12g, a second side surface 12h, a first angle 12i, and a second angle 12j.
  • the first side surface 12g is located on one end A1 side of the negative electrode lattice body 12a in the first direction X. In other words, the first side surface 12g is closer to one end A1 than the other end A2 in the first direction X.
  • the second side surface 12h is located on the other end A2 side of the negative electrode grid body 12a in the first direction X. In other words, the second side surface 12h is closer to the other end A2 than the other end A1 in the first direction X.
  • the first angle 12i is formed by the tip surface 12f and the first side surface 12g
  • the second angle 12j is formed by the tip surface 12f and the second side surface 12h.
  • each of the first corner 12i and the second corner 12j is chamfered.
  • each of the chamfered first corner 12i and second corner 12j has a round surface, but the present invention is not limited to this.
  • first angle 12i and the second angle 12j are chamfered after, for example, forming the convex portion 12d, but the present invention is not limited to this.
  • the chamfered first angle 12i and the second angle 12j may be formed.
  • the first corner 12i and the second corner 12j may have a shape such as a round surface without chamfering.
  • the thickness T1 of the convex portion 12d is smaller than the thickness T2 of the negative electrode lattice body 12a.
  • the maximum thickness T3 in the region of the negative electrode 12 where the negative electrode material 12c is provided is larger than the thickness T2 of the negative electrode lattice body 12a. Therefore, in the present embodiment, the maximum thickness of the negative electrode 12 corresponds to the maximum thickness T3 in the above region.
  • the thickness of the negative electrode grid 12a may be greater than or equal to the maximum thickness in the region of the negative electrode 12 where the negative electrode material 12c is provided. In this case, the maximum thickness of the negative electrode 12 corresponds to the thickness of the negative electrode lattice body 12a.
  • the convex portion 12e is located between one end A1 and the other end A2 of the negative electrode lattice body 12a in the first direction X, similarly to the convex portion 12d. Further, from the viewpoint of preventing damage to the separator 13 due to the convex portion 12e, each corner of the convex portion 12e is chamfered in the same manner as the convex portion 12d. The thickness of the convex portion 12e is smaller than the maximum thickness of the negative electrode 12.
  • each positive electrode 10 is electrically connected to the positive electrode terminal 5A.
  • Each positive electrode 10 and the positive electrode terminal 5A are electrically connected by a positive electrode strap 17.
  • the positive electrode strap 17 is connected to the selvage portion 10a of the positive electrode 10.
  • Each negative electrode 12 is electrically connected to the negative electrode terminal 5B.
  • Each negative electrode 12 and the negative electrode terminal 5B are electrically connected by a negative electrode strap 18.
  • the negative electrode strap 18 is connected to the selvage portion 12b of the negative electrode 12.
  • the separator 13 is a battery member (battery separator) for preventing a short circuit between the positive electrode 10 and the negative electrode 12.
  • the separator 13 is provided as long as it electronically insulates between the positive electrode 10 and the negative electrode 12 while allowing ions to permeate, and has resistance to oxidizing property on the positive electrode 10 side and reducing property on the negative electrode 12 side.
  • Examples of the material (material) of such a separator 13 include glass fiber, resin, and an inorganic substance.
  • the separator 13 covers the negative electrode lattice body 12a and the convex portions 12d and 12e of the negative electrode 12, and the selvage portion 12b of the negative electrode 12 is exposed from the separator 13.
  • FIG. 4A is a plan view showing a separator sheet
  • FIG. 4B is a schematic cross-sectional view taken along the line IVb-IVb of FIG. 4A.
  • the separator sheet 30 has a base 31, a pair of edges 32 and 33, and a plurality of ribs 34.
  • the base portion 31 is a sheet-like portion that is the main portion of the separator sheet 30 and exhibits flexibility.
  • the base 31 has a first main surface 31a and a second main surface 31b.
  • the second main surface 31b is located on the opposite side of the first main surface 31a in the first direction X.
  • the first main surface 31a and the second main surface 31b have a rectangular shape when viewed from the first direction X, but the present invention is not limited to this.
  • the pair of edge portions 32, 33 are portions provided at both ends of the separator sheet 30 in the third direction Z.
  • Each of the edges 32 and 33 extends from one end to the other end of the separator sheet 30 in the second direction Y.
  • One end of the separator sheet 30 in the second direction Y corresponds to, for example, the upper end of the paper surface in FIG. 4A.
  • the other end of the separator sheet 30 in the second direction Y corresponds to, for example, the lower end of the paper surface in FIG. 4A.
  • Each of the edges 32 and 33 may extend continuously or intermittently.
  • the edge portion 32 is provided at one end of the separator sheet 30 in the third direction Z
  • the edge portion 33 is provided at the other end of the separator sheet 30 in the third direction Z.
  • One end of the third direction Z corresponds to, for example, the left end of the paper surface in FIG. 4A.
  • the other end of the third direction Z corresponds to, for example, the right end of the paper surface in FIG. 4A.
  • the pair of edge portions 32, 33 are provided with ribs different from the ribs 34.
  • each of the pair of edge portions 32 and 33 may be provided with one or a plurality of ribs extending from one end to the other end of the separator sheet 30 in the second direction Y.
  • the plurality of ribs 34 are provided, for example, in order to improve the durability of the separator sheet 30, improve the fluidity of the electrolytic solution in the case 7, and the like.
  • the plurality of ribs 34 project from the base 31 along the first direction X and are separated from each other.
  • Each of the plurality of ribs 34 has a rectangular shape when viewed from the first direction X.
  • Each of the plurality of ribs 34 extends from one end to the other end of the separator sheet 30 in the second direction Y, and extends in parallel with each other.
  • the cross section of the rib 34 orthogonal to the extending direction of the rib 34 has a rectangular shape, but is not limited to this.
  • the cross section may be, for example, trapezoidal or inverted trapezoidal.
  • the dimension (width) of the rib 34 along the third direction Z is, for example, 0.30% or more and 2.5% or less of the dimension of the separator sheet 30 along the third direction Z.
  • the dimension (height) of the rib 34 along the first direction X is, for example, greater than 100% (thickness) of the dimension (thickness) of the base 31 along the first direction X and 1000% or less.
  • the rib 34 has a plurality of first ribs 34a provided on the first main surface 31a and a plurality of second ribs 34b provided on the second main surface 31b.
  • the first rib 34a projects from the first main surface 31a along the first direction X.
  • the second rib 34b protrudes from the second main surface 31b on the side opposite to the first rib 34a.
  • the first rib 34a and the second rib 34b have the same shape and completely overlap each other.
  • the portion of the separator sheet 30 where the rib 34 is provided is also referred to as the thick portion TP1 of the separator sheet 30 (and the separator 13).
  • the portion where the base portion 31 and the rib 34 overlap each other is also referred to as a thick portion TP1. Therefore, the thick portion TP1 has a rib 34.
  • the thickness of the thick portion TP1 in the present embodiment is the thickness of the base 31 and the height of the first rib 34a. It corresponds to the sum of the height and the height of the second rib 34b.
  • the second thickness T5 is, for example, 2000, which is larger than 100% of the first thickness T4. % Or less.
  • the case 7 has a main body 20 and a lid 22.
  • the main body 20 is a box-shaped electric tank.
  • the main body 20 is made of a material such as polypropylene.
  • the main body 20 houses the electrode group 3 and the electrolytic solution.
  • the main body 20 is composed of four side surface portions and a bottom portion 24.
  • the lid 22 covers the opening of the main body 20.
  • the lid 22 is provided with a positive electrode terminal 5A, a negative electrode terminal 5B, and a water tap 6.
  • a refilling tap 6 is provided between the positive electrode terminal 5A and the negative electrode terminal 5B.
  • FIG. 5A is a plan view showing the bottom of the main body 20
  • FIG. 5B is a schematic cross-sectional view taken along the line Vb-Vb of FIG. 5A
  • FIG. 5B is a schematic cross-sectional view.
  • (C) is a schematic cross-sectional view taken along the line Vc-Vc of FIG. 5 (a).
  • the main body 20 has a clasp 25 provided on the bottom 24 and projecting along the second direction Y.
  • the bracket 25 is a member for separating the positive electrode 10 and the negative electrode 12 from the bottom portion 24.
  • the clutter 25 may be detachably provided with respect to the main body 20 or may be integrated with the main body 20. In the former case, the Kura 25 is a separate part from the case 7.
  • the clasp 25 and the main body 20 may be integrally molded.
  • the class 25 has a substantially lattice shape when viewed from the second direction Y.
  • the clasp 25 has a plurality of first bone portions 26 extending along the first direction X and a second bone portion 27 extending along the third direction Z.
  • the plurality of first bone portions 26 are arranged apart from each other in, for example, the third direction Z, and extend from one side surface of the main body 20 in the first direction X to the other side surface. In the second direction Y, one end 26a of the first bone portion 26 is in contact with the bottom portion 24.
  • the other end 26b of the first bone portion 26 is located closer to the lid 22 than the second bone portion 27.
  • the other end 26b of the first bone portion 26 is closer to the lid 22 than the second bone portion 27.
  • the dimension S3 of the first bone portion 26 in the third direction Z is equal to or less than the dimension S1 of the convex portion 12d and the dimension S2 of the convex portion 12e along the third direction Z (see FIG. 2). From the viewpoint of suppressing the deposition of the active material on the Kura 25, the dimension S3 is, for example, 100% or less of the dimension S1 or the dimension S2, but is not limited thereto.
  • the plurality of second bone portions 27 are arranged apart from each other in, for example, the first direction X, and extend from one side surface to the other side surface of the main body 20 in the third direction Z.
  • the first bone portion and the second bone portion 27 are orthogonal to each other when viewed from the second direction Y.
  • FIG. 6 is a plan view showing a negative electrode wrapped in a separator.
  • the separator 13 corresponds to the bag-shaped work piece of the separator sheet 30 and encloses the negative electrode 12.
  • the selvage portion 12b of the negative electrode 12 is exposed from the separator 13, and the convex portions 12d and 12e of the negative electrode 12 are covered with the separator 13.
  • the separator 13 is formed, for example, by folding one separator sheet 30 in half along the second direction Y and then sealing a desired portion.
  • the separator sheet 30 is folded back on the convex portions 12d and 12e sides of the negative electrode 12 in the second direction Y so that the negative electrode 12 is sandwiched between the separator sheets 30.
  • the separator sheet 30 in the second direction Y, the separator sheet 30 is folded back outside the convex portions 12d and 12e of the negative electrode 12.
  • the folded portion of the separator sheet 30 faces the convex portions 12d and 12e in the second direction Y.
  • At least a part of each of the edges 32 and 33 is located outside the negative electrode 12 in the third direction Z.
  • the separator sheet 30 may be folded in half as the negative electrode 12 moves.
  • the separator 13 has a main portion 41, a pair of sealing portions 42, 43, a bent portion 44, and a joint portion 45.
  • the main portion 41 is a portion that accommodates the negative electrode lattice body 12a of the negative electrode 12.
  • the main portion 41 is composed of a base portion 31 and edge portions 32, 33 (see (a) of FIG. 4) of the separator sheet 30. Therefore, the main portion 41 has a first main surface 31a provided with the first rib 34a and a second main surface 31b provided with the second rib 34b (see (b) in FIG. 4).
  • the first main surface 31a faces the negative electrode 12, and the second main surface 31b is an exposed surface. Therefore, the positive electrode 10 (see FIG. 1) in the electrode group 3 faces the second main surface 31b of the separator sheet 30.
  • the pair of sealing portions 42, 43 is a portion for maintaining a state in which the separator sheet 30 is folded in half.
  • the seal portion 42 is formed on the edge portion 32 (see (a) in FIG. 4), and the seal portion 43 is formed on the edge portion 33 (see (a) in FIG. 4).
  • Each of the sealing portions 42 and 43 is located outside the negative electrode 12 in the third direction Z.
  • Each of the seal portions 42 and 43 extends in the second direction Y. As a result, the movement of the negative electrode 12 along the third direction Z can be suppressed by the sealing portions 42 and 43.
  • the sealing portions 42 and 43 do not have to be completely sealed.
  • a region through which the electrolytic solution can pass may be provided on at least one of the sealing portions 42 and 43.
  • the seal portions 42 and 43 are, for example, an ultrasonic welding portion, a heat seal portion, a cold seal portion, a gear seal portion, and the like.
  • the gear seal portion is a portion that is mechanically bonded by pressurization using a gear.
  • each of the seal portions 42 and 43 is a gear seal portion extending from one end to the other end of the separator 13 in the second direction Y.
  • the bent portion 44 is a portion to be folded back in the separator sheet 30. At least a part of the bent portion 44 may come into contact with the negative electrode lattice body 12a.
  • An opening 44a is provided in a part of the bent portion 44.
  • the opening 44a is, for example, a portion provided to improve the fluidity of the electrolytic solution in the separator 13.
  • the opening 44a is provided at a position that does not overlap with any of the convex portions 12d and 12e in the second direction Y.
  • the opening 44a is provided, for example, in the central portion of the separator 13 in the third direction Z, but is not limited thereto.
  • the opening 44a is formed by cutting a part of the bent portion 44.
  • the joint portion 45 is a portion for maintaining the state of the separator sheet 30 folded in half, like the seal portions 42 and 43.
  • the joint portion 45 is a portion for joining a part of the first main surface 31a of the separator sheet 30 and another part.
  • the part and the other part are portions that do not overlap the negative electrode 12 in the first direction X, and are located on the opposite side of the bent portion 44 in the second direction Y. Therefore, the joint portion 45 is located on one end side of the separator 13 in the second direction Y and outside the negative electrode 12 when viewed from the first direction X. Therefore, the joint portion 45 in the case 7 is located on the opposite side of the bottom portion 24 (see (a) of FIG. 5) of the main body 20 (electric tank) via the negative electrode 12.
  • the joint portion 45 faces the negative electrode lattice body 12a of the negative electrode 12 in the second direction Y and faces the selvage portion 12b in the third direction Z.
  • the joint 45 extends along the third direction Z. Specifically, the joint portion 45 extends from one end to the other end of the separator 13 in the third direction Z, and is provided on the main portion 41 and the seal portion 42. That is, a part of the joint portion 45 overlaps with the seal portion 42.
  • the joint portion 45 is, for example, a portion where the separator sheet 30 itself is welded. In this case, in the joint portion 45, a part of the first main surface 31a and another part are welded. From the viewpoint of preventing poor welding, the joint portion 45 may be formed by ultrasonic welding or the like.
  • the joint portion 45 may be provided after the formation of the seal portions 42, 43, or may be provided before the formation of the seal portions 42, 43.
  • FIG. 7A is an enlarged view of the region surrounded by the alternate long and short dash line shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line VIIb-VIIb of FIG. 7A. Is.
  • the first rib 34a included in the thick portion TP1 overlaps the convex portion 12d in the second direction Y.
  • at least two first ribs 34a overlap the convex portion 12d in the second direction Y. Therefore, even when the positions of the negative electrode 12 and the separator 13 are displaced, the state in which at least one first rib 34a overlaps the convex portion 12d in the second direction Y can be satisfactorily maintained.
  • the convex portion 12e also overlaps with at least one first rib 34a in the second direction Y.
  • the convex portion 12e may overlap with two or more first ribs 34a.
  • FIG. 8 (a) is a cross-sectional view taken along the line VIIIa-VIIIa of FIG. 7 (a), and FIG. 8 (b) is a cross-sectional view taken along the line VIIIb-VIIIb of FIG. 7 (a). It is a figure.
  • the bent portion 44 of the separator 13 is in contact with the convex portion 12d.
  • the tip surface 12f, the first angle 12i, and the second angle 12j are separated from the base 31, but they are separated from each other. Not limited to.
  • a part of the base portion 31 may abut on at least one of the tip surface 12f, the first corner 12i and the second corner 12j.
  • the convex portion 12e is also in contact with the thick portion TP1.
  • FIG. 9 is an enlarged cross-sectional view of a main part of the storage battery.
  • the electrolytic solution and the positive electrode are omitted.
  • the convex portions 12d and 12e of the negative electrode 12 are the bottom portion of the main body 20. Facing 24.
  • the convex portion 12d faces the bracket 25 on the bottom portion 24 in the second direction Y, and the separator 13 is located between the convex portion 12d and the bracket 25. Therefore, the separator 13 is sandwiched between the convex portion 12d and the bracket 25 in the second direction Y.
  • the thick portion TP1 of the separator 13 is sandwiched between the convex portion 12d and the first bone portion 26 of the bracket 25 in the second direction Y.
  • the first rib 34a comes into contact with the convex portion 12d
  • the second rib 34b comes into contact with the clasp 25.
  • the base 31 of the separator 13 may be in contact with at least one of the convex portion 12d and the clasp 25, or may be separated from both the convex portion 12d and the clasp 25.
  • the convex portion 12e faces the bracket 25 in the second direction Y like the convex portion 12d, and the thick portion TP1 is separated from the convex portion 12e and the bracket 25 in the second direction Y. It is sandwiched by the first bone portion 26 of the above.
  • the base 31 of the separator 13 may be in contact with at least one of the convex portion 12e and the clasp 25, or may be separated from both the convex portion 12e and the clasp 25.
  • the separator sheet 30 and the negative electrode 12 are prepared.
  • the first main surface 31a of the separator sheet 30 and the negative electrode 12 are opposed to each other.
  • the separator sheet 30 is folded in half to form the bent portion 44, and the negative electrode 12 is sandwiched by the separator sheet 30.
  • the negative electrode lattice body 12a of the negative electrode 12 is completely covered with the separator sheet 30, and a part of the selvage portion 12b of the negative electrode 12 is exposed from the separator sheet 30.
  • the seal portions 42, 43 and the joint portion 45 are formed on the separator sheet 30.
  • the seal portions 42 and 43 are formed by, for example, a gear seal or the like.
  • the joint portion 45 is formed by, for example, ultrasonic welding using an ultrasonic welding device including a horn.
  • the separator sheet 30 is attracted to the joint portion 45 at least in the second direction Y. Since the bent portion 44 is formed on the separator sheet 30, tension is generated in the separator sheet 30 at least in the second direction Y. As a result, a part of the separator sheet 30 is pressed against the convex portions 12d and 12e of the negative electrode 12. Subsequently, by forming the opening 44a in the bent portion 44, the separator 13 that encloses the negative electrode 12 is formed.
  • the negative electrode 12 wrapped in the separator 13 is conveyed by a conveyor such as a belt conveyor. At this time, the negative electrode 12 wrapped in the separator 13 is laid down on the transfer device. In other words, the negative electrode 12 wrapped in the separator 13 is arranged on the transport device so that the protruding directions of the convex portions 12d and 12e of the negative electrode 12 are orthogonal to the height direction. As described above, since each of the convex portions 12d and 12e is located between one end A1 and the other end A2 of the negative electrode lattice body 12a, the convex portions 12d and 12e can be separated from the above-mentioned transport device.
  • the positive electrode 10 and the negative electrode 12 are alternately laminated.
  • the selvage portions 10a of the positive electrode 10 are electrically connected to each other via the positive electrode strap 17, and the selvage portions 12b of the negative electrode 12 are electrically connected to each other via the negative electrode strap 18.
  • the electrode group 3 including the plurality of positive electrodes 10, the plurality of negative electrodes 12, and the plurality of separators 13 is formed.
  • the electrode group 3 is housed in the main body 20.
  • each of the convex portions 12d and 12e of the negative electrode 12 is arranged on the bracket 25 on the bottom portion 24. Subsequently, the main body 20 is sealed with the lid 22. At this time, each positive electrode 10 is electrically connected to the positive electrode terminal 5A, and each negative electrode 12 is electrically connected to the negative electrode terminal 5B. Subsequently, the electrolytic solution is supplied into the case 7 via the refill plug 6. As a result, the storage battery 1 is manufactured.
  • each of the convex portions 12d and 12e of the negative electrode 12 is covered with the separator 13.
  • the convex portions 12d and 12e of the negative electrode 12 abut on the bottom 24 of the main body 20. Therefore, the load tends to be concentrated on the portions of the separator 13 that come into contact with the convex portions 12d and 12e.
  • the thick portion TP1 of the separator 13 comes into contact with the convex portions 12d and 12e.
  • the load-bearing performance of the portions of the separator 13 that come into contact with the convex portions 12d and 12e is satisfactorily improved. Therefore, according to the present embodiment, damage to the separator 13 can be satisfactorily prevented.
  • the thick portion TP1 abuts on the convex portions 12d and 12e of the negative electrode 12.
  • the portion of the base portion 31 of the separator 13 where the first rib 34a is not provided is less likely to come into contact with the convex portions 12d and 12e. Therefore, it is difficult for the load from the convex portions 12d and 12e to be applied to the portion of the separator 13 having a relatively low load-bearing performance (that is, the portion of the separator 13 where the rib 34 is not provided). Therefore, in the present embodiment, as described above, damage to the separator 13 can be satisfactorily prevented.
  • the separator 13 includes a first main surface 31a facing the negative electrode 12, and the thick portion TP1 has a first rib 34a protruding from the first main surface 31a toward the negative electrode 12.
  • the 1 rib 34a abuts on the convex portion 12d.
  • the base portion 31 of the separator 13 is less likely to come into contact with the convex portion 12d.
  • the convex portion 12d is in contact with two or more first ribs 34a. In this case, the base portion 31 of the separator 13 is less likely to come into contact with the convex portion 12d.
  • the separator 13 includes a second main surface 31b located on the opposite side of the first main surface 31a, and the thick portion TP1 projects from the second main surface 31b on the opposite side to the first rib 34a. It has a second rib 34b.
  • the separator 13 when the battery component is housed in the main body 20 of the case 7, it is possible to satisfactorily prevent damage to the portion of the separator 13 sandwiched between the convex portion 12d and the bottom portion 24 of the main body 20. In addition, in the present embodiment, it is possible to satisfactorily prevent damage to the portion of the separator 13 sandwiched between the convex portion 12e and the bottom portion 24.
  • the separator 13 is folded back at the convex portions 12d and 12r of the negative electrode 12 in the second direction Y. Therefore, the convex portions 12d and 12e can be well covered by the bent portion 44 of the separator 13 and its surroundings.
  • the separator 13 has an opening 44a located on the convex portions 12d and 12e side of the negative electrode 12 in the second direction Y.
  • the electrolytic solution easily flows in the electrode group 3.
  • the first corner 12i and the second corner 12j of the convex portion 12d are chamfered.
  • the load concentration from the convex portion 12d to the specific portion of the thick portion TP1 can be suppressed as compared with the embodiment in which the convex portion 12d is provided with an unchamfered angle, for example.
  • the corners of the convex portion 12e can also be chamfered. Therefore, it is possible to suppress the load concentration from the convex portion 12e to the specific portion of the thick portion TP1.
  • the thickness T1 of the convex portion 12d in the first direction X is smaller than the maximum thickness T3 of the negative electrode 12 in the first direction X
  • the convex portion 12d is the negative electrode lattice of the negative electrode 12 in the first direction X. It is located between one end A1 and the other end A2 of the body 12a.
  • the separator 13 is less likely to be sandwiched between the convex portion 12d and the transport device.
  • the case 7 has a clasp 25 provided on the bottom portion 24 and projecting along the second direction Y, and the thick portion TP1 is sandwiched between the convex portions 12d and the clasp 25. Therefore, the thick portion TP1 is sandwiched between the convex portion 12d and the bracket 25, so that the separator 13 is prevented from being damaged.
  • the dimension S1 of the convex portion 12d in the third direction Z is equal to or less than the dimension S3 of the bracket 25 in the third direction Z. Therefore, when the negative electrode 12 wrapped in the separator 13 is housed in the case 7, the load is less likely to be concentrated from the convex portion 12d to the specific portion of the bracket 25. Therefore, the thick portion TP1 is satisfactorily less likely to be damaged.
  • FIG. 10A is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the first modification.
  • the first rib 34a and the second rib 34b provided on the separator 13A do not overlap each other in the thickness direction of the base 31.
  • the second rib 34b is located between two adjacent first ribs 34a in the third direction Z.
  • the separator 13A has a thick portion TP2 including the first rib 34a and a thick portion TP3 including the second rib 34b.
  • the thickness of the thick portion TP2 corresponds to the sum of the thickness of the base 31 and the height of the first rib 34a.
  • the thickness of the thick portion TP3 corresponds to the sum of the thickness of the base 31 and the height of the second rib 34b.
  • the thick portion TP2 abuts on the negative electrode 12 (more specifically, the convex portions 12d and 12e), and the thick portion TP3 It abuts on the bottom 24 (more specifically, the class 25) of the main body 20. Even in such a first modification, the same action and effect as those of the above embodiment can be achieved.
  • FIG. 10B is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the second modification.
  • the dimension S4 along the third direction Z of the first bone portion 26A included in the bracket 25A is larger than the dimension S1 of the convex portion 12d.
  • the dimension S1 of the convex portion 12d in the third direction Z is smaller than the dimension S4 of the bracket 25A in the third direction Z.
  • the dimension S4 is larger than the dimension S2 (see FIG. 2) of the convex portion 12e. Also in such a second modification, the same action and effect as those of the above embodiment are exhibited.
  • the thick portion TP1 is likely to be sandwiched between the convex portion 12d and the bracket 25A.
  • the dimension S2 of the convex portion 12e in the third direction Z is smaller than the dimension S4 of the Kura 25A in the third direction Z, the thick portion TP1 is likely to be sandwiched between the convex portion 12e and the Kura 25A.
  • FIG. 11 is a plan view showing a negative electrode wrapped in the separator according to the third modification.
  • the separator 13B does not have a bent portion facing the convex portions 12d and 12e of the negative electrode 12 in the second direction Y. Therefore, in the third modification, the separator 13B is composed of two separator sheets 30.
  • a separator sheet 30 located on one end side of the negative electrode 12 in the first direction X (hereinafter, may be referred to as a “first separator sheet”) and a separator located on the other end side of the negative electrode 12 in the first direction X.
  • the separator 13B is formed by joining the sheet 30 (hereinafter, may be referred to as a "second separator sheet") to each other at the sealing portions 42, 43 and the like.
  • the first separator sheet is arranged at a position where it can come into contact with one end of the negative electrode 12 in the first direction X.
  • the second separator sheet is arranged at a position where it can come into contact with the other end of the negative electrode 12 in the first direction X.
  • the separator 13B has joints 51 and 52 facing the negative electrode 12 in the second direction Y in addition to the joint 45 instead of the bent portion.
  • Each of the joint portions 51 and 52 is a portion where a part (first part) of the separator 13B and another part (second part) are joined to each other.
  • a part of the separator 13B is included in the first separator sheet, and the other part of the separator 13B is included in the second separator sheet.
  • the joint portion 51 faces the convex portion 12d in the second direction Y
  • the joint portion 52 faces the convex portion 12e in the second direction Y.
  • the dimension S5 of the joint portion 51 in the third direction Z is equal to or larger than the dimension S1 of the convex portion 12d.
  • the dimensions of the first portion and the second portion corresponding to the joint portion 51 along the third direction Z are equal to or larger than the dimension S1 of the convex portion 12d.
  • the dimension S6 of the joint portion 52 in the third direction Z is equal to or larger than the dimension S2 of the convex portion 12e.
  • the dimension of the first portion and the second portion corresponding to the joint portion 52 along the third direction Z is equal to or larger than the dimension S2 of the convex portion 12e.
  • Each of the joint portions 51 and 52 extends along the third direction Z.
  • the joint portion 51 extends from one end to the other end of the separator 13B in the third direction Z, and is provided on the main portion 41 and the seal portion 42.
  • the joint portion 52 extends from the other end of the third direction Z toward one end, and is provided on the main portion 41 and the seal portion 42.
  • the joint portions 51 and 52 are aligned in the third direction Z and are separated from each other.
  • An opening 53 is provided between the joints 51 and 52 in the third direction Z.
  • the opening 53 is a portion of the separator 13B where the first separator sheet and the second separator sheet are not joined to each other.
  • the opening 53 is located on the convex portions 12d and 12e side in the second direction Y. In other words, the opening 53 is closer to the convex portions 12d and 12e than the selvage portion 12b in the second direction Y.
  • the opening 53 does not overlap the convex portions 12d and 12e in the second direction Y
  • each of the joining portions 51 and 52 is, for example, a portion where the first separator sheet and the second separator sheet are welded to each other. From the viewpoint of preventing poor welding, each of the joint portions 51 and 52 may be formed by ultrasonic welding or the like. Each of the joint portions 51 and 52 may be provided after the formation of the seal portions 42 and 43, or may be provided before the formation of the seal portions 42 and 43.
  • the separator 13B is composed of two separator sheets 30, but the separator 13B is not limited to this.
  • a separator sheet folded in half along the third direction Z may be used. That is, the separator according to the third modification may be formed from one separator sheet.
  • the battery component according to one aspect of the present disclosure is not limited to the above embodiment and the above modification.
  • the above-described embodiment and the above-mentioned modification may be combined as appropriate.
  • the first modification and the second modification may be combined.
  • the ribs seen from the first direction extend linearly, but the ribs are not limited to this.
  • the ribs when viewed from the first direction, may extend in a wavy pattern or may extend in a zigzag pattern.
  • the rib may have a point shape (dot shape), a circular shape, an elliptical shape, or a polygonal shape when viewed from the first direction.
  • the rib may have a polygonal pyramid shape, a polygonal pyramid shape, a conical shape, or a truncated cone shape.
  • the cross section of the rib may be a semicircular shape or a polygonal shape.
  • the ribs may extend along the second direction or may extend along the third direction. Seen from the first direction, the fishbone structure may be formed by a plurality of ribs.
  • the thick portion includes ribs, but the thickness is not limited to this.
  • the thick portion may be a portion thicker than the thinnest portion of the separator, and may not include ribs.
  • the separator may have both a thick portion with ribs and a thick portion without ribs.
  • the separator sheet is folded in half along the second direction, but the present invention is not limited to this.
  • the separator sheet may be folded in half along the third direction. In this case, the bent portion of the separator may not be provided with an opening.
  • the separator is formed from one separator sheet, but is not limited thereto.
  • the separator may be formed from a plurality of separator sheets.
  • seal portions may be formed on both ends of the separator in the third direction, or seal portions may be formed on only one side in the third direction.
  • joint portions are formed on both sides of the separator in the second direction. A joint may be formed on only one side in the second direction. Therefore, when the separator is formed from a plurality of separator sheets, the separator may be a bag-shaped processed product, a tubular processed product, or a processed product different from the bag-shaped processed product and the tubular processed product. good.
  • Electrode group 5A ... Positive electrode terminal, 5B ... Negative electrode terminal, 7 ... Case, 10 ... Positive electrode (second electrode plate), 10a ... Ear, 12 ... Negative electrode (first electrode plate), 12a ... Negative electrode lattice, 12b ... Ear, 12c ... Negative electrode material, 12d, 12e ... Convex, 12i ... First corner (corner), 12j ... Second corner (corner), 13, 13A, 13B ... Separator, 20 ... Main body , 22 ... lid, 24 ... bottom, 25, 25A ... class, 30 ... separator sheet, 31 ... base, 31a ... first main surface, 31b ... second main surface, 32, 33 ...

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Separators (AREA)
  • Secondary Cells (AREA)

Abstract

This cell constituent element comprises a first electrode plate and a separator that overlap each other in a first direction. The first electrode plate has a body part and foot part that projects from the body part along a second direction orthogonal to the first direction and that is covered by the separator. The separator is provided with a base having a first thickness, and a thick part that has a second thickness greater than the first thickness and that abuts the foot part.

Description

電池構成要素、蓄電池、組電池及び電動車Battery components, storage batteries, assembled batteries and electric vehicles
　本開示は、電池構成要素、蓄電池、組電池及び電動車に関する。 This disclosure relates to battery components, storage batteries, assembled batteries and electric vehicles.
　電池には、正極と負極との短絡を防止するためのセパレータが用いられる。例えば、下記特許文献１には、袋セパレータ入り電極板の製造方法が開示される。下記特許文献１においては、セパレータを折り曲げることによって、電極板が挟み込まれる。加えて、複数箇所の溶着部分がセパレータに形成されることによって、袋状のセパレータが設けられる。 A separator is used for the battery to prevent a short circuit between the positive electrode and the negative electrode. For example, Patent Document 1 below discloses a method for manufacturing an electrode plate containing a bag separator. In Patent Document 1 below, the electrode plate is sandwiched by bending the separator. In addition, a bag-shaped separator is provided by forming a plurality of welded portions on the separator.
特許第４６６１４２３号公報Japanese Patent No. 4661423
　電池に収容されるセパレータが破損することによって当該セパレータに開口が形成されると、当該開口を介して正極と負極とが短絡しやすくなる。このため、セパレータの破損を防止可能な態様が望まれている。 If an opening is formed in the separator due to damage to the separator housed in the battery, the positive electrode and the negative electrode are likely to be short-circuited through the opening. Therefore, a mode capable of preventing damage to the separator is desired.
　本開示の一側面の目的は、セパレータの破損を良好に防止可能な電池構成要素、蓄電池、組電池及び電動車の提供である。 An object of one aspect of the present disclosure is to provide battery components, storage batteries, assembled batteries and electric vehicles capable of satisfactorily preventing damage to the separator.
　本開示の一側面に係る電池構成要素は、第１方向にて互いに重なる第１極板及びセパレータを備え、第１極板は、本体部と、第１方向に直交する第２方向に沿って本体部から突出すると共にセパレータに覆われる足部とを有し、セパレータは、第１厚さを有する基部と、第１厚さよりも厚い第２厚さを有すると共に足部に当接する肉厚部とを備える。 The battery components according to one aspect of the present disclosure include a first electrode plate and a separator that overlap each other in the first direction, and the first electrode plate is along a second direction orthogonal to the first direction with the main body portion. It has a foot portion that protrudes from the main body and is covered with a separator, and the separator has a base portion having a first thickness and a thick portion having a second thickness thicker than the first thickness and abutting on the foot portion. And prepare.
　この電池構成要素では、第１極板の足部はセパレータに覆われる。このため、例えば第１極板を電池の電槽に収容する場合等にて、セパレータのうち足部と当接する部分に荷重が集中する傾向がある。ここで上記電池構成要素では、セパレータの肉厚部が足部に当接する。これにより、セパレータのうち足部と当接する部分の耐荷重性能が良好に向上する。したがって上記一側面によれば、セパレータの破損を良好に防止可能である。 In this battery component, the foot of the first electrode plate is covered with a separator. Therefore, for example, when the first electrode plate is housed in the battery case, the load tends to be concentrated on the portion of the separator that comes into contact with the foot portion. Here, in the battery component, the thick portion of the separator abuts on the foot portion. As a result, the load-bearing performance of the portion of the separator that comes into contact with the foot portion is satisfactorily improved. Therefore, according to the above aspect, damage to the separator can be satisfactorily prevented.
　セパレータは、第１極板に対向する第１主面をさらに備え、肉厚部は、第１主面から第１極板に向かって突出する第１リブを有し、第１リブは、足部に当接してもよい。この場合、セパレータの基部が足部に当接しにくくなる。 The separator further comprises a first main surface facing the first electrode plate, the thick portion has a first rib projecting from the first main surface toward the first electrode plate, and the first rib is a foot. It may come into contact with the portion. In this case, it becomes difficult for the base of the separator to come into contact with the foot.
　肉厚部は、第１リブを複数有し、足部は、２つ以上の第１リブに当接してもよい。この場合、セパレータの基部が足部により当接しにくくなる。 The thick portion may have a plurality of first ribs, and the foot portion may abut on two or more first ribs. In this case, the base of the separator is less likely to come into contact with the foot.
　セパレータは、第１主面の反対側に位置する第２主面をさらに備え、肉厚部は、第２主面から第１リブと反対側に突出する第２リブを有してもよい。例えば、電池構成要素が電槽に収容される場合等にて、セパレータにおいて足部と電槽とに挟まれる部分の破損を良好に防止可能である。 The separator may further include a second main surface located on the opposite side of the first main surface, and the thick portion may have a second rib protruding from the second main surface to the opposite side of the first rib. For example, when the battery component is housed in the battery case, it is possible to satisfactorily prevent damage to the portion of the separator sandwiched between the foot and the battery case.
　セパレータの第１部分と第２部分とが互いに接合されており、第１部分と第２部分とのそれぞれは、第２方向において足部に対向してもよい。この場合、足部がセパレータから露出しにくくなる。 The first part and the second part of the separator are joined to each other, and each of the first part and the second part may face the foot part in the second direction. In this case, the foot is less likely to be exposed from the separator.
　第１部分と第２部分とは、互いに溶着されてもよい。この場合、第１部分と第２部分とを強固に接合できる。 The first part and the second part may be welded to each other. In this case, the first portion and the second portion can be firmly joined.
　第１方向及び第２方向に直交する第３方向における第１部分及び第２部分の寸法は、第３方向における足部の寸法以上でもよい。この場合、セパレータにおいて第１部分と第２部分とが接合している箇所以外にて、足部がより露出しにくくなる。 The dimensions of the first portion and the second portion in the third direction orthogonal to the first direction and the second direction may be equal to or larger than the dimensions of the foot portion in the third direction. In this case, the foot portion is less likely to be exposed except at the portion where the first portion and the second portion are joined in the separator.
　セパレータは、第２方向における第１極板の足部側にて折り返されてもよい。この場合、セパレータの折り返された部分によって足部が良好に覆われ得る。 The separator may be folded back on the foot side of the first electrode plate in the second direction. In this case, the foot can be well covered by the folded portion of the separator.
　セパレータは、第２方向における第１極板の足部側に位置する開口部を有してもよい。例えば、電池構成要素及び電解液が電槽に収容される場合、当該電解液が電池構成要素内を流動しやすくなる。 The separator may have an opening located on the foot side of the first electrode plate in the second direction. For example, when the battery component and the electrolytic solution are housed in the battery case, the electrolytic solution tends to flow in the battery component.
　足部の角は、面取りされてもよい。この場合、例えば足部に面取りされていない角が設けられる態様と比較して、肉厚部の特定箇所に対する足部からの荷重集中を抑制できる。 The corners of the foot may be chamfered. In this case, it is possible to suppress the load concentration from the foot portion to a specific portion of the thick portion, as compared with the embodiment in which the foot portion is provided with an unchamfered angle, for example.
　第１方向における足部の厚さは、第１方向における第１極板の最大厚みの厚さよりも小さく、足部は、第１方向における第１極板の一端と他端との間に位置してもよい。例えば、電池構成要素を寝かせ、当該電池構成要素をベルトコンベア等の搬送装置を用いて搬送する場合、足部が搬送装置から離間する。このため、セパレータが足部と搬送装置に挟まれにくくなる。よって、電池構成要素の搬送時における足部に起因したセパレータの破損を抑制できる。 The thickness of the foot in the first direction is smaller than the thickness of the maximum thickness of the first electrode in the first direction, and the foot is located between one end and the other end of the first electrode in the first direction. You may. For example, when the battery component is laid down and the battery component is transported by using a transport device such as a belt conveyor, the foot portion is separated from the transport device. Therefore, it becomes difficult for the separator to be sandwiched between the foot and the transport device. Therefore, it is possible to suppress damage to the separator caused by the foot during transportation of the battery component.
　本開示の一側面に係る蓄電池は、上記電池構成要素と、電池構成要素が収容される電槽と、を備え、電池構成要素は、第１方向においてセパレータを介して第１極板に積層される第２極板をさらに有し、肉厚部は、足部と電槽の底部とに挟まれる。この蓄電池は、セパレータの破損を良好に防止可能な電池構成要素を含む。加えて、肉厚部が足部と電槽の底部とに挟まれるので、電池構成要素を電槽に収容するときにセパレータが破損しにくくなる。このため、セパレータを介して互いに積層される第１極板と第２極板との短絡を良好に抑制可能である。 The storage battery according to one aspect of the present disclosure includes the battery component and an electric tank in which the battery component is housed, and the battery component is laminated on the first electrode plate via a separator in the first direction. The second electrode plate is further provided, and the thick portion is sandwiched between the foot portion and the bottom portion of the battery case. This storage battery includes battery components that can satisfactorily prevent breakage of the separator. In addition, since the thick portion is sandwiched between the foot and the bottom of the battery case, the separator is less likely to be damaged when the battery components are housed in the battery case. Therefore, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate that are laminated with each other via the separator.
　電槽は、底部上に設けられると共に第２方向に沿って突出するクラを有し、肉厚部は、足部とクラとによって挟まれてもよい。この場合、足部とクラとの間に肉厚部が挟まれることによって、セパレータの破損が抑制される。 The battery case has a clasp that is provided on the bottom and protrudes along the second direction, and the thick portion may be sandwiched between the foot and the clasp. In this case, damage to the separator is suppressed by sandwiching the thick portion between the foot portion and the bracket.
　第１方向及び第２方向に直交する第３方向における足部の寸法は、第３方向におけるクラの寸法よりも大きくてもよい。この場合、電池構成要素を電槽に収容するときに足部からクラの特定箇所に荷重が集中しにくくなるので、肉厚部が良好に破損しにくくなる。 The size of the foot in the first direction and the third direction orthogonal to the second direction may be larger than the size of the clasp in the third direction. In this case, when the battery component is housed in the battery case, the load is less likely to be concentrated from the foot portion to the specific portion of the bracket, so that the thick portion is less likely to be damaged satisfactorily.
　第１方向及び第２方向に直交する第３方向における足部の寸法は、第３方向におけるクラの寸法以下でもよい。この場合、電槽における電池構成要素の位置がずれた場合であっても、肉厚部が足部とクラとの間に挟まれやすくなる。 The size of the foot in the first direction and the third direction orthogonal to the second direction may be less than or equal to the size of the clasp in the third direction. In this case, even if the position of the battery component in the battery case is displaced, the thick portion is likely to be sandwiched between the foot portion and the bracket.
　上記蓄電池は、鉛蓄電池でもよい。 The above storage battery may be a lead storage battery.
　本開示の一側面に係る組電池は、上記蓄電池を備える。この組電池は、セパレータの破損を良好に防止可能な電池構成要素を含む蓄電池を備える。このため、当該蓄電池において、セパレータを介して互いに積層される第１極板と第２極板との短絡を良好に抑制可能である。 The assembled battery according to one aspect of the present disclosure includes the above-mentioned storage battery. The assembled battery comprises a storage battery that includes battery components that can satisfactorily prevent breakage of the separator. Therefore, in the storage battery, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate laminated with each other via the separator.
　本開示の一側面に係る電動車は、上記組電池を備える。この電動車は、セパレータの破損を良好に防止可能な電池構成要素を含む蓄電池を備える。このため、当該蓄電池において、セパレータを介して互いに積層される第１極板と第２極板との短絡を良好に抑制可能である。 The electric vehicle according to one aspect of the present disclosure is equipped with the above-mentioned assembled battery. This electric vehicle comprises a storage battery that includes a battery component that can satisfactorily prevent breakage of the separator. Therefore, in the storage battery, it is possible to satisfactorily suppress a short circuit between the first electrode plate and the second electrode plate laminated with each other via the separator.
　本開示の一側面によれば、セパレータの破損を良好に防止可能な電池構成要素、蓄電池、組電池及び電動車を提供できる。 According to one aspect of the present disclosure, it is possible to provide a battery component, a storage battery, an assembled battery and an electric vehicle capable of satisfactorily preventing damage to the separator.
図１は、実施形態に係る蓄電池の一部を破断して示す斜視図である。FIG. 1 is a perspective view showing a part of the storage battery according to the embodiment broken. 図２は、実施形態に係る負極を示す平面図である。FIG. 2 is a plan view showing a negative electrode according to an embodiment. 図３は、図２のIII-III線に沿った断面図である。FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 図４の（ａ）は、セパレータシートを示す平面図であり、図４の（ｂ）は、図４の（ａ）のIVb-IVb線に沿った概略断面図である。FIG. 4A is a plan view showing a separator sheet, and FIG. 4B is a schematic cross-sectional view taken along the line IVb-IVb of FIG. 4A. 図５の（ａ）は、本体の底部を示す平面図であり、図５の（ｂ）は、図５の（ａ）のVb-Vb線に沿った概略断面図であり、図５の（ｃ）は、図５の（ａ）のVc-Vc線に沿った概略断面図である。5A is a plan view showing the bottom of the main body, FIG. 5B is a schematic cross-sectional view taken along the line Vb-Vb of FIG. 5A, and FIG. c) is a schematic cross-sectional view taken along the line Vc-Vc of FIG. 5 (a). 図６は、セパレータに包まれる負極を示す平面図である。FIG. 6 is a plan view showing a negative electrode wrapped in a separator. 図７の（ａ）は、図６に示される一点鎖線にて囲んだ領域の拡大図であり、図７の（ｂ）は、図７の（ａ）のVIIb-VIIb線に沿った断面図である。FIG. 7A is an enlarged view of the region surrounded by the alternate long and short dash line shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line VIIb-VIIb of FIG. 7A. Is. 図８の（ａ）は、図７の（ａ）のVIIIa-VIIIa線に沿った断面図であり、図８の（ｂ）は、図７の（ａ）のVIIIb-VIIIb線に沿った断面図である。8 (a) is a cross-sectional view taken along the line VIIIa-VIIIa of FIG. 7 (a), and FIG. 8 (b) is a cross-sectional view taken along the line VIIIb-VIIIb of FIG. 7 (a). It is a figure. 図９は、蓄電池の要部拡大断面図である。FIG. 9 is an enlarged cross-sectional view of a main part of the storage battery. 図１０の（ａ）は、第１変形例に係るセパレータ及び負極の要部拡大断面図であり、図１０の（ｂ）は、第２変形例に係るセパレータ及び負極の要部拡大断面図である。FIG. 10A is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the first modification, and FIG. 10B is an enlarged cross-sectional view of the main part of the separator and the negative electrode according to the second modification. be. 図１１は、第３変形例に係るセパレータに包まれる負極を示す平面図である。FIG. 11 is a plan view showing a negative electrode wrapped in the separator according to the third modification.
　以下、添付図面を参照して、本開示の一側面の好適な実施形態について詳細に説明する。なお、以下の説明において、同一要素又は同一機能を有する要素には、同一符号を用いることとし、重複する説明は省略する。 Hereinafter, preferred embodiments of one aspect of the present disclosure will be described in detail with reference to the accompanying drawings. In the following description, the same reference numerals will be used for the same elements or elements having the same function, and duplicate description will be omitted.
　図１は、本実施形態に係る蓄電池の一部を破断して示す斜視図である。図１に示されるように、蓄電池１は、例えば、制御弁式の鉛蓄電池である。蓄電池１は、例えば自動車のバッテリー、停電時等に利用されるバックアップ用電源、及び、電動フォークリフト等の電動車（もしくは電気車）の主電源に用いられる。これらの場合、複数の蓄電池１によって構成される組電池が用いられることがある。例えば、上記電動車は、複数の蓄電池１を含む組電池を有することがある。本実施形態では、蓄電池１は、例えば、クラッド式電極を備えるクラッド式鉛蓄電池である。蓄電池１は、電極群３と、正極端子５Ａと、負極端子５Ｂと、補水栓６と、ケース７とを備える。 FIG. 1 is a perspective view showing a part of the storage battery according to the present embodiment broken. As shown in FIG. 1, the storage battery 1 is, for example, a control valve type lead storage battery. The storage battery 1 is used, for example, as a battery of an automobile, a backup power source used in the event of a power failure, and a main power source of an electric vehicle (or an electric vehicle) such as an electric forklift. In these cases, an assembled battery composed of a plurality of storage batteries 1 may be used. For example, the electric vehicle may have an assembled battery including a plurality of storage batteries 1. In the present embodiment, the storage battery 1 is, for example, a clad-type lead-acid battery provided with a clad-type electrode. The storage battery 1 includes an electrode group 3, a positive electrode terminal 5A, a negative electrode terminal 5B, a water tap 6, and a case 7.
　電極群３は、複数の正極１０と、複数の負極１２と、複数のセパレータ１３とを有する。電極群３では、正極１０と負極１２とが交互に配置されている。隣り合う正極１０と負極１２との間には、セパレータ１３が介在している。このため、正極１０は、セパレータ１３を介して負極１２に積層される。本実施形態では、電極群３において、正極１０、負極１２及びセパレータ１３の配列方向（以下、単に「配列方向」もしくは「積層方向」と称することもある）の端部には、負極１２が配置されている。加えて、正極１０と、負極１２と、セパレータ１３とのそれぞれは、電池構成要素とも呼称される。以下では、複数の正極１０と、複数の負極１２と、複数のセパレータ１３とが互いに重なる方向（積層方向）を第１方向Ｘとする。また、第１方向Ｘに直交する方向を第２方向Ｙとし、第１方向Ｘ及び第２方向Ｙに直交する方向を第３方向Ｚとする。本実施形態では、第２方向Ｙは電極群３がケース７に収容される方向に相当する。第２方向Ｙと第３方向Ｚとは互いに直交しているが、これに限られない。第２方向Ｙと第３方向Ｚとは、互いに交差していればよい。 The electrode group 3 has a plurality of positive electrodes 10, a plurality of negative electrodes 12, and a plurality of separators 13. In the electrode group 3, the positive electrode 10 and the negative electrode 12 are arranged alternately. A separator 13 is interposed between the adjacent positive electrode 10 and the negative electrode 12. Therefore, the positive electrode 10 is laminated on the negative electrode 12 via the separator 13. In the present embodiment, in the electrode group 3, the negative electrode 12 is arranged at the end of the positive electrode 10, the negative electrode 12, and the separator 13 in the arrangement direction (hereinafter, may be simply referred to as “arrangement direction” or “stacking direction”). Has been done. In addition, each of the positive electrode 10, the negative electrode 12, and the separator 13 is also referred to as a battery component. In the following, the direction (stacking direction) in which the plurality of positive electrodes 10, the plurality of negative electrodes 12, and the plurality of separators 13 overlap each other is referred to as the first direction X. Further, the direction orthogonal to the first direction X is referred to as the second direction Y, and the direction orthogonal to the first direction X and the second direction Y is referred to as the third direction Z. In the present embodiment, the second direction Y corresponds to the direction in which the electrode group 3 is housed in the case 7. The second direction Y and the third direction Z are orthogonal to each other, but the present invention is not limited to this. The second direction Y and the third direction Z may intersect with each other.
　正極１０（第２極板）は、例えば、クラッド式正極板である。正極１０は、管状電極群１４を有している。管状電極群１４は、複数の管状電極１５を有する。複数の管状電極１５は、一列に配列されている。複数の管状電極１５のそれぞれは、例えば、クラッドチューブ、当該クラッドチューブ内に挿入された芯金、及び、クラッドチューブと芯金との間に充填された正極材を有する。クラッドチューブは、ガントレットとも呼称される筒状の多孔体チューブであり、例えば、ガラス、樹脂等によって形成される。正極材は、正極活物質と、添加剤とを含み得る。正極活物質は、例えば、鉛粉、鉛丹等である。添加剤としては、炭素材料、又は、補強用短繊維等が挙げられる。化成後の正極活物質は、例えば二酸化鉛等である。 The positive electrode 10 (second electrode plate) is, for example, a clad type positive electrode plate. The positive electrode 10 has a tubular electrode group 14. The tubular electrode group 14 has a plurality of tubular electrodes 15. The plurality of tubular electrodes 15 are arranged in a row. Each of the plurality of tubular electrodes 15 has, for example, a clad tube, a core metal inserted in the clad tube, and a positive electrode material filled between the clad tube and the core metal. The clad tube is a tubular porous tube also called a gauntlet, and is formed of, for example, glass, resin, or the like. The positive electrode material may contain a positive electrode active material and an additive. The positive electrode active material is, for example, lead powder, lead tan, or the like. Examples of the additive include carbon materials, reinforcing short fibers and the like. The positive electrode active material after chemical conversion is, for example, lead dioxide or the like.
　図２は、実施形態に係る負極を示す平面図である。負極１２（第１極板）は、負極格子体１２ａと、耳部１２ｂとを有する負極板である。負極格子体１２ａは、負極１２における本体部であり、負極材１２ｃを保持する。本実施形態では、負極１２において負極材１２ｃが保持される部分の厚さは、負極格子体１２ａの厚さよりも大きいが、これに限られない。負極材１２ｃは、負極活物質と、添加剤とを含み得る。負極活物質は、例えば、海綿状鉛等である。添加剤としては、硫酸バリウム、炭素材料、又は、補強用短繊維等が挙げられる。耳部１２ｂは、第２方向Ｙに沿って負極格子体１２ａから突出する端子部である。耳部１２ｂと負極格子体１２ａとは、配列方向において互いに重なっていない。本実施形態では、負極格子体１２ａは、セパレータ１３によって覆われている。負極格子体１２ａには、凸部１２ｄ，１２ｅが設けられている。凸部１２ｄ，１２ｅは、所定の間隔をあけて配置されており、負極格子体１２ａから外側に向かって突出している足部である。凸部１２ｄ，１２ｅは、耳部１２ｂの突出方向と反対側の方向に沿って突出している。本実施形態では、耳部１２ｂの突出方向と、凸部１２ｄ，１２ｅの突出方向とのそれぞれは、配列方向に対して直交している。また、耳部１２ｂと負極格子体１２ａとは、配列方向において互いに重なっていない。 FIG. 2 is a plan view showing a negative electrode according to an embodiment. The negative electrode 12 (first electrode plate) is a negative electrode plate having a negative electrode lattice body 12a and a selvage portion 12b. The negative electrode grid body 12a is the main body portion of the negative electrode 12, and holds the negative electrode material 12c. In the present embodiment, the thickness of the portion of the negative electrode 12 where the negative electrode material 12c is held is larger than the thickness of the negative electrode grid 12a, but is not limited to this. The negative electrode material 12c may contain a negative electrode active material and an additive. The negative electrode active material is, for example, spongy lead or the like. Examples of the additive include barium sulfate, a carbon material, and reinforcing short fibers. The selvage portion 12b is a terminal portion protruding from the negative electrode grid body 12a along the second direction Y. The selvage portion 12b and the negative electrode grid body 12a do not overlap each other in the arrangement direction. In the present embodiment, the negative electrode grid 12a is covered with the separator 13. The negative electrode lattice body 12a is provided with convex portions 12d and 12e. The convex portions 12d and 12e are foot portions that are arranged at predetermined intervals and project outward from the negative electrode grid body 12a. The convex portions 12d and 12e project along the direction opposite to the projecting direction of the selvage portion 12b. In the present embodiment, the protruding direction of the selvage portion 12b and the protruding direction of the convex portions 12d and 12e are orthogonal to the arrangement direction, respectively. Further, the selvage portion 12b and the negative electrode lattice body 12a do not overlap each other in the arrangement direction.
　図３は、図２のIII-III線に沿った断面図である。図３に示されるように、凸部１２ｄは、第１方向Ｘにおける負極格子体１２ａの一端Ａ１と他端Ａ２との間に位置する。凸部１２ｄは、先端面１２ｆと、第１側面１２ｇと、第２側面１２ｈと、第１角１２ｉと、第２角１２ｊとを有する。第１側面１２ｇは、第１方向Ｘにおける負極格子体１２ａの一端Ａ１側に位置する。換言すると、第１側面１２ｇは、第１方向Ｘにおいて、他端Ａ２よりも一端Ａ１に近い。第２側面１２ｈは、第１方向Ｘにおける負極格子体１２ａの他端Ａ２側に位置する。換言すると、第２側面１２ｈは、第１方向Ｘにおいて、一端Ａ１よりも他端Ａ２に近い。第１角１２ｉは先端面１２ｆと第１側面１２ｇとによってなされており、第２角１２ｊは、先端面１２ｆと第２側面１２ｈとによってなされる。凸部１２ｄに起因するセパレータ１３の破損防止の観点から、第１角１２ｉと第２角１２ｊとのそれぞれは、面取りされている。本実施形態では、面取りされた第１角１２ｉと第２角１２ｊとのそれぞれは、丸面になっているが、これに限られない。第１角１２ｉと第２角１２ｊとのそれぞれは、例えば、凸部１２ｄの形成後に面取りされるが、これに限られない。凸部１２ｄの形成完了時に、面取りされた第１角１２ｉと第２角１２ｊとが形成されてもよい。換言すると、第１角１２ｉと第２角１２ｊとは、面取り工程をしなくとも丸面等の形状を有し得る。 FIG. 3 is a cross-sectional view taken along the line III-III of FIG. As shown in FIG. 3, the convex portion 12d is located between one end A1 and the other end A2 of the negative electrode lattice body 12a in the first direction X. The convex portion 12d has a tip surface 12f, a first side surface 12g, a second side surface 12h, a first angle 12i, and a second angle 12j. The first side surface 12g is located on one end A1 side of the negative electrode lattice body 12a in the first direction X. In other words, the first side surface 12g is closer to one end A1 than the other end A2 in the first direction X. The second side surface 12h is located on the other end A2 side of the negative electrode grid body 12a in the first direction X. In other words, the second side surface 12h is closer to the other end A2 than the other end A1 in the first direction X. The first angle 12i is formed by the tip surface 12f and the first side surface 12g, and the second angle 12j is formed by the tip surface 12f and the second side surface 12h. From the viewpoint of preventing damage to the separator 13 due to the convex portion 12d, each of the first corner 12i and the second corner 12j is chamfered. In the present embodiment, each of the chamfered first corner 12i and second corner 12j has a round surface, but the present invention is not limited to this. Each of the first angle 12i and the second angle 12j is chamfered after, for example, forming the convex portion 12d, but the present invention is not limited to this. When the formation of the convex portion 12d is completed, the chamfered first angle 12i and the second angle 12j may be formed. In other words, the first corner 12i and the second corner 12j may have a shape such as a round surface without chamfering.
　凸部１２ｄの厚さＴ１は、負極格子体１２ａの厚さＴ２よりも小さい。第１方向Ｘにおいて、負極１２のうち負極材１２ｃが設けられる領域における最大厚さＴ３は、負極格子体１２ａの厚さＴ２よりも大きい。このため本実施形態では、負極１２の最大厚みは、上記領域における最大厚さＴ３に相当する。なお、負極格子体１２ａの厚さは、負極１２のうち負極材１２ｃが設けられる領域における最大厚さ以上でもよい。この場合、負極１２の最大厚みは、負極格子体１２ａの厚さに相当する。 The thickness T1 of the convex portion 12d is smaller than the thickness T2 of the negative electrode lattice body 12a. In the first direction X, the maximum thickness T3 in the region of the negative electrode 12 where the negative electrode material 12c is provided is larger than the thickness T2 of the negative electrode lattice body 12a. Therefore, in the present embodiment, the maximum thickness of the negative electrode 12 corresponds to the maximum thickness T3 in the above region. The thickness of the negative electrode grid 12a may be greater than or equal to the maximum thickness in the region of the negative electrode 12 where the negative electrode material 12c is provided. In this case, the maximum thickness of the negative electrode 12 corresponds to the thickness of the negative electrode lattice body 12a.
　図示しないが、凸部１２ｅは、凸部１２ｄと同様に、第１方向Ｘにおいて負極格子体１２ａの一端Ａ１と他端Ａ２との間に位置する。また、凸部１２ｅに起因するセパレータ１３の破損防止の観点から、凸部１２ｅにおける各角は、凸部１２ｄと同様に面取りされている。凸部１２ｅの厚さは、負極１２の最大厚みよりも小さい。 Although not shown, the convex portion 12e is located between one end A1 and the other end A2 of the negative electrode lattice body 12a in the first direction X, similarly to the convex portion 12d. Further, from the viewpoint of preventing damage to the separator 13 due to the convex portion 12e, each corner of the convex portion 12e is chamfered in the same manner as the convex portion 12d. The thickness of the convex portion 12e is smaller than the maximum thickness of the negative electrode 12.
　図１に戻って、各正極１０は、正極端子５Ａと電気的に接続されている。各正極１０と正極端子５Ａとは、正極ストラップ１７によって電気的に接続されている。正極ストラップ１７は、正極１０の耳部１０ａに接続されている。各負極１２は、負極端子５Ｂと電気的に接続されている。各負極１２と負極端子５Ｂとは、負極ストラップ１８によって電気的に接続されている。負極ストラップ１８は、負極１２の耳部１２ｂに接続されている。 Returning to FIG. 1, each positive electrode 10 is electrically connected to the positive electrode terminal 5A. Each positive electrode 10 and the positive electrode terminal 5A are electrically connected by a positive electrode strap 17. The positive electrode strap 17 is connected to the selvage portion 10a of the positive electrode 10. Each negative electrode 12 is electrically connected to the negative electrode terminal 5B. Each negative electrode 12 and the negative electrode terminal 5B are electrically connected by a negative electrode strap 18. The negative electrode strap 18 is connected to the selvage portion 12b of the negative electrode 12.
　セパレータ１３は、正極１０と負極１２との短絡を防止するための電池用部材（電池用セパレータ）である。セパレータ１３は、正極１０と負極１２との間を電子的には絶縁する一方でイオンを透過させ、且つ、正極１０側における酸化性及び負極１２側における還元性に対する耐性を備えるものであれば、特に制限されない。このようなセパレータ１３の材料（材質）としては、ガラス繊維、樹脂、無機物等が挙げられる。本実施形態では、セパレータ１３は負極１２の負極格子体１２ａ及び凸部１２ｄ，１２ｅを覆っており、且つ、負極１２の耳部１２ｂはセパレータ１３から露出している。 The separator 13 is a battery member (battery separator) for preventing a short circuit between the positive electrode 10 and the negative electrode 12. The separator 13 is provided as long as it electronically insulates between the positive electrode 10 and the negative electrode 12 while allowing ions to permeate, and has resistance to oxidizing property on the positive electrode 10 side and reducing property on the negative electrode 12 side. There are no particular restrictions. Examples of the material (material) of such a separator 13 include glass fiber, resin, and an inorganic substance. In the present embodiment, the separator 13 covers the negative electrode lattice body 12a and the convex portions 12d and 12e of the negative electrode 12, and the selvage portion 12b of the negative electrode 12 is exposed from the separator 13.
　ここで図４の（ａ），（ｂ）を参照しながら、セパレータ１３の加工前製品であるセパレータシートの構造について説明する。図４の（ａ）は、セパレータシートを示す平面図であり、図４の（ｂ）は、図４の（ａ）のIVb-IVb線に沿った概略断面図である。図４の（ａ），（ｂ）に示されるように、セパレータシート３０は、基部３１と、一対の縁部３２，３３と、複数のリブ３４とを有する。 Here, the structure of the separator sheet, which is the unprocessed product of the separator 13, will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A is a plan view showing a separator sheet, and FIG. 4B is a schematic cross-sectional view taken along the line IVb-IVb of FIG. 4A. As shown in FIGS. 4A and 4B, the separator sheet 30 has a base 31, a pair of edges 32 and 33, and a plurality of ribs 34.
　基部３１は、セパレータシート３０の主要部となるシート状部分であり、可撓性を示す。基部３１は、第１主面３１ａと、第２主面３１ｂとを有する。セパレータシート３０内にて、第２主面３１ｂは、第１方向Ｘにおいて第１主面３１ａの反対側に位置する。本実施形態では、第１主面３１ａ及び第２主面３１ｂは、第１方向Ｘから見て矩形状を呈するが、これに限られない。 The base portion 31 is a sheet-like portion that is the main portion of the separator sheet 30 and exhibits flexibility. The base 31 has a first main surface 31a and a second main surface 31b. In the separator sheet 30, the second main surface 31b is located on the opposite side of the first main surface 31a in the first direction X. In the present embodiment, the first main surface 31a and the second main surface 31b have a rectangular shape when viewed from the first direction X, but the present invention is not limited to this.
　一対の縁部３２，３３は、第３方向Ｚにおけるセパレータシート３０の両端に設けられる部分である。縁部３２，３３のそれぞれは、第２方向Ｙにおけるセパレータシート３０の一端から他端まで延在する。第２方向Ｙにおけるセパレータシート３０の一端は、例えば、図４の（ａ）における紙面上端に相当する。第２方向Ｙにおけるセパレータシート３０の他端は、例えば、図４の（ａ）における紙面下端に相当する。縁部３２，３３のそれぞれは、連続的に延在してもよいし、間欠的に延在してもよい。縁部３２は第３方向Ｚにおけるセパレータシート３０の一端に設けられ、縁部３３は第３方向Ｚにおけるセパレータシート３０の他端に設けられる。第３方向Ｚの一端は、例えば、図４の（ａ）における紙面左端に相当する。第３方向Ｚの他端は、例えば、図４の（ａ）における紙面右端に相当する。本実施形態では、一対の縁部３２，３３には、リブ３４とは異なるリブが設けられる。例えば、一対の縁部３２，３３のそれぞれには、第２方向Ｙにおけるセパレータシート３０の一端から他端まで延在するリブ等が一又は複数設けられてもよい。 The pair of edge portions 32, 33 are portions provided at both ends of the separator sheet 30 in the third direction Z. Each of the edges 32 and 33 extends from one end to the other end of the separator sheet 30 in the second direction Y. One end of the separator sheet 30 in the second direction Y corresponds to, for example, the upper end of the paper surface in FIG. 4A. The other end of the separator sheet 30 in the second direction Y corresponds to, for example, the lower end of the paper surface in FIG. 4A. Each of the edges 32 and 33 may extend continuously or intermittently. The edge portion 32 is provided at one end of the separator sheet 30 in the third direction Z, and the edge portion 33 is provided at the other end of the separator sheet 30 in the third direction Z. One end of the third direction Z corresponds to, for example, the left end of the paper surface in FIG. 4A. The other end of the third direction Z corresponds to, for example, the right end of the paper surface in FIG. 4A. In the present embodiment, the pair of edge portions 32, 33 are provided with ribs different from the ribs 34. For example, each of the pair of edge portions 32 and 33 may be provided with one or a plurality of ribs extending from one end to the other end of the separator sheet 30 in the second direction Y.
　複数のリブ３４は、例えば、セパレータシート３０の耐久性向上、ケース７内における電解液の流動性向上等を図るために設けられる。複数のリブ３４は、第１方向Ｘに沿って基部３１から突出しており、互いに離間している。複数のリブ３４のそれぞれは、第１方向Ｘから見て矩形状を呈する。複数のリブ３４のそれぞれは、第２方向Ｙにおけるセパレータシート３０の一端から他端まで延在しており、且つ、互いに平行に延在している。リブ３４の延在方向に対して直交するリブ３４の断面は、矩形状を呈するが、これに限られない。当該断面は、例えば、台形状でもよいし、逆台形状でもよい。第３方向Ｚに沿ったリブ３４の寸法（幅）は、例えば、第３方向Ｚに沿ったセパレータシート３０の寸法の０．３０％以上２．５％以下である。第１方向Ｘに沿ったリブ３４の寸法（高さ）は、例えば、第１方向Ｘに沿った基部３１の寸法（厚さ）の１００％より大きく１０００％以下である。図４の（ｂ）に示されるように、リブ３４は、第１主面３１ａに設けられる複数の第１リブ３４ａと、第２主面３１ｂに設けられる複数の第２リブ３４ｂとを有する。第１リブ３４ａは、第１方向Ｘに沿って第１主面３１ａから突出する。第２リブ３４ｂは、第２主面３１ｂから第１リブ３４ａと反対側に突出する。本実施形態では、第１リブ３４ａと第２リブ３４ｂとは、互いに同一形状を有し、且つ、互いに完全に重なっている。 The plurality of ribs 34 are provided, for example, in order to improve the durability of the separator sheet 30, improve the fluidity of the electrolytic solution in the case 7, and the like. The plurality of ribs 34 project from the base 31 along the first direction X and are separated from each other. Each of the plurality of ribs 34 has a rectangular shape when viewed from the first direction X. Each of the plurality of ribs 34 extends from one end to the other end of the separator sheet 30 in the second direction Y, and extends in parallel with each other. The cross section of the rib 34 orthogonal to the extending direction of the rib 34 has a rectangular shape, but is not limited to this. The cross section may be, for example, trapezoidal or inverted trapezoidal. The dimension (width) of the rib 34 along the third direction Z is, for example, 0.30% or more and 2.5% or less of the dimension of the separator sheet 30 along the third direction Z. The dimension (height) of the rib 34 along the first direction X is, for example, greater than 100% (thickness) of the dimension (thickness) of the base 31 along the first direction X and 1000% or less. As shown in FIG. 4B, the rib 34 has a plurality of first ribs 34a provided on the first main surface 31a and a plurality of second ribs 34b provided on the second main surface 31b. The first rib 34a projects from the first main surface 31a along the first direction X. The second rib 34b protrudes from the second main surface 31b on the side opposite to the first rib 34a. In the present embodiment, the first rib 34a and the second rib 34b have the same shape and completely overlap each other.
　以下では、セパレータシート３０においてリブ３４が設けられる部分は、セパレータシート３０（及びセパレータ１３）における肉厚部ＴＰ１とも呼称される。換言すると、セパレータシート３０（及びセパレータ１３）において、基部３１とリブ３４とが互いに重なる部分は、肉厚部ＴＰ１とも呼称される。このため、肉厚部ＴＰ１は、リブ３４を有する。上述したように、第１リブ３４ａと第２リブ３４ｂとは互いに完全に重なっていることから、本実施形態における肉厚部ＴＰ１の厚さは、基部３１の厚さと、第１リブ３４ａの高さと、第２リブ３４ｂの高さとの合計に相当する。基部３１の厚さを第１厚さＴ４とし、肉厚部ＴＰ１の厚さを第２厚さＴ５としたとき、第２厚さＴ５は、例えば、第１厚さＴ４の１００％より大きく２０００％以下である。 In the following, the portion of the separator sheet 30 where the rib 34 is provided is also referred to as the thick portion TP1 of the separator sheet 30 (and the separator 13). In other words, in the separator sheet 30 (and the separator 13), the portion where the base portion 31 and the rib 34 overlap each other is also referred to as a thick portion TP1. Therefore, the thick portion TP1 has a rib 34. As described above, since the first rib 34a and the second rib 34b completely overlap each other, the thickness of the thick portion TP1 in the present embodiment is the thickness of the base 31 and the height of the first rib 34a. It corresponds to the sum of the height and the height of the second rib 34b. When the thickness of the base portion 31 is the first thickness T4 and the thickness of the thick portion TP1 is the second thickness T5, the second thickness T5 is, for example, 2000, which is larger than 100% of the first thickness T4. % Or less.
　図１に戻って、ケース７は、本体２０と、蓋２２とを有する。本体２０は、箱状を呈している電槽である。本体２０は、例えばポリプロピレン等の材料で形成されている。本体２０は、電極群３及び電解液を収容する。本体２０は、４つの側面部と、底部２４とにより構成されている。蓋２２は、本体２０の開口部を覆う。蓋２２には、正極端子５Ａと、負極端子５Ｂと、補水栓６とが設けられる。正極端子５Ａと負極端子５Ｂとの間には、補水栓６が設けられる。 Returning to FIG. 1, the case 7 has a main body 20 and a lid 22. The main body 20 is a box-shaped electric tank. The main body 20 is made of a material such as polypropylene. The main body 20 houses the electrode group 3 and the electrolytic solution. The main body 20 is composed of four side surface portions and a bottom portion 24. The lid 22 covers the opening of the main body 20. The lid 22 is provided with a positive electrode terminal 5A, a negative electrode terminal 5B, and a water tap 6. A refilling tap 6 is provided between the positive electrode terminal 5A and the negative electrode terminal 5B.
　図５の（ａ）は、本体２０の底部を示す平面図であり、図５の（ｂ）は、図５の（ａ）のVb-Vb線に沿った概略断面図であり、図５の（ｃ）は、図５の（ａ）のVc-Vc線に沿った概略断面図である。図５の（ａ）～（ｃ）に示されるように、本体２０は、底部２４上に設けられると共に第２方向Ｙに沿って突出するクラ２５を有する。クラ２５は、正極１０及び負極１２と、底部２４とを離間させるための部材である。クラ２５は、本体２０に対して着脱可能に設けられてもよいし、本体２０に一体化されてもよい。前者の場合、クラ２５は、ケース７とは別部品となる。後者の場合、クラ２５と本体２０とは一体成型されてもよい。クラ２５が設けられることによって、正極１０及び／又は負極１２から脱落した活物質の堆積物に起因した短絡を抑制できる。クラ２５は、第２方向Ｙから見て略格子形状を有する。クラ２５は、第１方向Ｘに沿って延在する複数の第１骨部２６と、第３方向Ｚに沿って延在する第２骨部２７とを有する。複数の第１骨部２６は、例えば第３方向Ｚにおいて互いに離間して配置されており、第１方向Ｘにおける本体２０の一側面から他側面まで延在する。第２方向Ｙにおいて、第１骨部２６の一端２６ａは底部２４に接する。第２方向Ｙにおいて、第１骨部２６の他端２６ｂは、第２骨部２７よりも蓋２２側に位置する。換言すると、第２方向Ｙにおいて、第１骨部２６の他端２６ｂは、第２骨部２７よりも蓋２２に近い。第３方向Ｚにおける第１骨部２６の寸法Ｓ３は、第３方向Ｚに沿った凸部１２ｄの寸法Ｓ１及び凸部１２ｅの寸法Ｓ２（図２を参照）以下である。クラ２５上における活物質の堆積を抑制する観点から、寸法Ｓ３は、例えば、寸法Ｓ１もしくは寸法Ｓ２の１００％以下であるが、これに限られない。複数の第２骨部２７は、例えば第１方向Ｘにおいて互いに離間して配置されており、第３方向Ｚにおける本体２０の一側面から他側面まで延在する。第１骨部と第２骨部２７とは、第２方向Ｙから見て互いに直交している。 5A is a plan view showing the bottom of the main body 20, FIG. 5B is a schematic cross-sectional view taken along the line Vb-Vb of FIG. 5A, and FIG. 5B is a schematic cross-sectional view. (C) is a schematic cross-sectional view taken along the line Vc-Vc of FIG. 5 (a). As shown in FIGS. 5A to 5C, the main body 20 has a clasp 25 provided on the bottom 24 and projecting along the second direction Y. The bracket 25 is a member for separating the positive electrode 10 and the negative electrode 12 from the bottom portion 24. The clutter 25 may be detachably provided with respect to the main body 20 or may be integrated with the main body 20. In the former case, the Kura 25 is a separate part from the case 7. In the latter case, the clasp 25 and the main body 20 may be integrally molded. By providing the class 25, it is possible to suppress a short circuit caused by a deposit of active material that has fallen off from the positive electrode 10 and / or the negative electrode 12. The class 25 has a substantially lattice shape when viewed from the second direction Y. The clasp 25 has a plurality of first bone portions 26 extending along the first direction X and a second bone portion 27 extending along the third direction Z. The plurality of first bone portions 26 are arranged apart from each other in, for example, the third direction Z, and extend from one side surface of the main body 20 in the first direction X to the other side surface. In the second direction Y, one end 26a of the first bone portion 26 is in contact with the bottom portion 24. In the second direction Y, the other end 26b of the first bone portion 26 is located closer to the lid 22 than the second bone portion 27. In other words, in the second direction Y, the other end 26b of the first bone portion 26 is closer to the lid 22 than the second bone portion 27. The dimension S3 of the first bone portion 26 in the third direction Z is equal to or less than the dimension S1 of the convex portion 12d and the dimension S2 of the convex portion 12e along the third direction Z (see FIG. 2). From the viewpoint of suppressing the deposition of the active material on the Kura 25, the dimension S3 is, for example, 100% or less of the dimension S1 or the dimension S2, but is not limited thereto. The plurality of second bone portions 27 are arranged apart from each other in, for example, the first direction X, and extend from one side surface to the other side surface of the main body 20 in the third direction Z. The first bone portion and the second bone portion 27 are orthogonal to each other when viewed from the second direction Y.
　次に、図６を参照しながら、電池構成要素に含まれる、負極とセパレータとを組み合わせた構造について詳細に説明する。図６は、セパレータに包まれる負極を示す平面図である。図６に示されるように、セパレータ１３は、セパレータシート３０の袋状加工物に相当し、負極１２を包んでいる。上述したように、負極１２の耳部１２ｂは、セパレータ１３から露出しており、負極１２の凸部１２ｄ，１２ｅは、セパレータ１３に覆われる。セパレータ１３は、例えば、１枚のセパレータシート３０を第２方向Ｙに沿って二つ折りした後、所望の箇所が封止されることによって形成される。このとき、負極１２がセパレータシート３０にて挟まれるように、第２方向Ｙにおける負極１２の凸部１２ｄ，１２ｅ側にてセパレータシート３０が折り返される。換言すると、第２方向Ｙにおいて、負極１２の凸部１２ｄ，１２ｅよりも外側にてセパレータシート３０が折り返される。これにより、セパレータシート３０において折り返される部分は、第２方向Ｙにおいて、凸部１２ｄ，１２ｅに対向する。縁部３２，３３のそれぞれにおける少なくとも一部は、第３方向Ｚにおいて負極１２の外側に位置する。作業性向上の観点から、負極１２の移動に伴ってセパレータシート３０が二つ折りされてもよい。セパレータ１３は、主部４１と、一対のシール部４２，４３と、屈曲部４４と、接合部４５とを有する。 Next, with reference to FIG. 6, the structure in which the negative electrode and the separator included in the battery component are combined will be described in detail. FIG. 6 is a plan view showing a negative electrode wrapped in a separator. As shown in FIG. 6, the separator 13 corresponds to the bag-shaped work piece of the separator sheet 30 and encloses the negative electrode 12. As described above, the selvage portion 12b of the negative electrode 12 is exposed from the separator 13, and the convex portions 12d and 12e of the negative electrode 12 are covered with the separator 13. The separator 13 is formed, for example, by folding one separator sheet 30 in half along the second direction Y and then sealing a desired portion. At this time, the separator sheet 30 is folded back on the convex portions 12d and 12e sides of the negative electrode 12 in the second direction Y so that the negative electrode 12 is sandwiched between the separator sheets 30. In other words, in the second direction Y, the separator sheet 30 is folded back outside the convex portions 12d and 12e of the negative electrode 12. As a result, the folded portion of the separator sheet 30 faces the convex portions 12d and 12e in the second direction Y. At least a part of each of the edges 32 and 33 is located outside the negative electrode 12 in the third direction Z. From the viewpoint of improving workability, the separator sheet 30 may be folded in half as the negative electrode 12 moves. The separator 13 has a main portion 41, a pair of sealing portions 42, 43, a bent portion 44, and a joint portion 45.
　主部４１は、負極１２の負極格子体１２ａを収容する部分である。主部４１は、セパレータシート３０の基部３１及び縁部３２，３３（図４の（ａ）を参照）から構成される。このため、主部４１は、第１リブ３４ａが設けられる第１主面３１ａと、第２リブ３４ｂが設けられる第２主面３１ｂとを有する（図４の（ｂ）を参照）。本実施形態では、第１主面３１ａが負極１２に対向しており、第２主面３１ｂが露出面となっている。このため、電極群３における正極１０（図１を参照）は、セパレータシート３０の第２主面３１ｂに対向する。 The main portion 41 is a portion that accommodates the negative electrode lattice body 12a of the negative electrode 12. The main portion 41 is composed of a base portion 31 and edge portions 32, 33 (see (a) of FIG. 4) of the separator sheet 30. Therefore, the main portion 41 has a first main surface 31a provided with the first rib 34a and a second main surface 31b provided with the second rib 34b (see (b) in FIG. 4). In the present embodiment, the first main surface 31a faces the negative electrode 12, and the second main surface 31b is an exposed surface. Therefore, the positive electrode 10 (see FIG. 1) in the electrode group 3 faces the second main surface 31b of the separator sheet 30.
　一対のシール部４２，４３は、セパレータシート３０が二つ折りされる状態を維持するための部分である。シール部４２は縁部３２（図４の（ａ）を参照）に形成され、シール部４３は縁部３３（図４の（ａ）を参照）に形成される。シール部４２，４３のそれぞれは、第３方向Ｚにおいて負極１２の外側に位置する。シール部４２，４３のそれぞれは、第２方向Ｙに延在している。これにより、第３方向Ｚに沿った負極１２の移動が、シール部４２，４３によって抑制できる。シール部４２，４３では、完全に密封されなくてもよい。セパレータ１３内における電解液の流動性の観点から、シール部４２，４３の少なくとも一方では、電解液が通過可能な領域が設けられてもよい。シール部４２，４３は、例えば、超音波溶着部、ヒートシール部、コールドシール部、ギアシール部等である。ギアシール部は、ギアを用いた加圧によって機械的に貼り合わされる部分である。本実施形態では、シール部４２，４３のそれぞれは、第２方向Ｙにおけるセパレータ１３の一端から他端まで延在するギアシール部である。 The pair of sealing portions 42, 43 is a portion for maintaining a state in which the separator sheet 30 is folded in half. The seal portion 42 is formed on the edge portion 32 (see (a) in FIG. 4), and the seal portion 43 is formed on the edge portion 33 (see (a) in FIG. 4). Each of the sealing portions 42 and 43 is located outside the negative electrode 12 in the third direction Z. Each of the seal portions 42 and 43 extends in the second direction Y. As a result, the movement of the negative electrode 12 along the third direction Z can be suppressed by the sealing portions 42 and 43. The sealing portions 42 and 43 do not have to be completely sealed. From the viewpoint of the fluidity of the electrolytic solution in the separator 13, a region through which the electrolytic solution can pass may be provided on at least one of the sealing portions 42 and 43. The seal portions 42 and 43 are, for example, an ultrasonic welding portion, a heat seal portion, a cold seal portion, a gear seal portion, and the like. The gear seal portion is a portion that is mechanically bonded by pressurization using a gear. In the present embodiment, each of the seal portions 42 and 43 is a gear seal portion extending from one end to the other end of the separator 13 in the second direction Y.
　屈曲部４４は、セパレータシート３０において折り返される部分である。屈曲部４４の少なくとも一部は、負極格子体１２ａに当接し得る。屈曲部４４の一部には、開口部４４ａが設けられる。開口部４４ａは、例えば、セパレータ１３内における電解液の流動性を向上するために設けられる部分である。開口部４４ａは、第２方向Ｙにおいて凸部１２ｄ，１２ｅのいずれにも重ならない位置に設けられる。開口部４４ａは、例えば第３方向Ｚにおけるセパレータ１３の中央部に設けられるが、これに限られない。例えば、屈曲部４４の一部が切断されることによって、開口部４４ａが形成される。 The bent portion 44 is a portion to be folded back in the separator sheet 30. At least a part of the bent portion 44 may come into contact with the negative electrode lattice body 12a. An opening 44a is provided in a part of the bent portion 44. The opening 44a is, for example, a portion provided to improve the fluidity of the electrolytic solution in the separator 13. The opening 44a is provided at a position that does not overlap with any of the convex portions 12d and 12e in the second direction Y. The opening 44a is provided, for example, in the central portion of the separator 13 in the third direction Z, but is not limited thereto. For example, the opening 44a is formed by cutting a part of the bent portion 44.
　接合部４５は、シール部４２，４３と同様に、二つ折りされたセパレータシート３０の状態を維持するための部分である。接合部４５は、セパレータシート３０の第１主面３１ａの一部と別の一部とを接合する部分である。当該一部と当該別の一部とは、第１方向Ｘにおいて負極１２に重ならない部分であり、第２方向Ｙにおいて屈曲部４４の反対側に位置する。このため、接合部４５は、第２方向Ｙにおけるセパレータ１３の一端側であって、第１方向Ｘから見て負極１２の外側に位置する。よって、ケース７内における接合部４５は、負極１２を介して本体２０（電槽）の底部２４（図５の（ａ）を参照）の反対側に位置する。また、接合部４５は、第２方向Ｙにて負極１２の負極格子体１２ａに対向し、且つ、第３方向Ｚにおいて耳部１２ｂに対向する。接合部４５は、第３方向Ｚに沿って延在している。具体的には、接合部４５は、第３方向Ｚにおけるセパレータ１３の一端から他端に向かって延在しており、主部４１及びシール部４２に設けられる。すなわち、接合部４５の一部は、シール部４２に重なる。接合部４５は、例えば、セパレータシート３０自体が溶着された部分である。この場合、接合部４５においては、第１主面３１ａの一部と別の一部とが溶着されている。溶着不良の防止の観点から、接合部４５は、超音波溶着等によって形成されてもよい。接合部４５は、シール部４２，４３の形成後に設けられてもよいし、シール部４２，４３の形成前に設けられてもよい。 The joint portion 45 is a portion for maintaining the state of the separator sheet 30 folded in half, like the seal portions 42 and 43. The joint portion 45 is a portion for joining a part of the first main surface 31a of the separator sheet 30 and another part. The part and the other part are portions that do not overlap the negative electrode 12 in the first direction X, and are located on the opposite side of the bent portion 44 in the second direction Y. Therefore, the joint portion 45 is located on one end side of the separator 13 in the second direction Y and outside the negative electrode 12 when viewed from the first direction X. Therefore, the joint portion 45 in the case 7 is located on the opposite side of the bottom portion 24 (see (a) of FIG. 5) of the main body 20 (electric tank) via the negative electrode 12. Further, the joint portion 45 faces the negative electrode lattice body 12a of the negative electrode 12 in the second direction Y and faces the selvage portion 12b in the third direction Z. The joint 45 extends along the third direction Z. Specifically, the joint portion 45 extends from one end to the other end of the separator 13 in the third direction Z, and is provided on the main portion 41 and the seal portion 42. That is, a part of the joint portion 45 overlaps with the seal portion 42. The joint portion 45 is, for example, a portion where the separator sheet 30 itself is welded. In this case, in the joint portion 45, a part of the first main surface 31a and another part are welded. From the viewpoint of preventing poor welding, the joint portion 45 may be formed by ultrasonic welding or the like. The joint portion 45 may be provided after the formation of the seal portions 42, 43, or may be provided before the formation of the seal portions 42, 43.
　図７の（ａ）は、図６に示される一点鎖線にて囲んだ領域の拡大図であり、図７の（ｂ）は、図７の（ａ）のVIIb-VIIb線に沿った断面図である。図７の（ａ），（ｂ）に示されるように、肉厚部ＴＰ１に含まれる第１リブ３４ａは、第２方向Ｙにおいて凸部１２ｄに重なっている。本実施形態では、少なくとも２つの第１リブ３４ａが、第２方向Ｙにおいて凸部１２ｄに重なっている。このため、負極１２とセパレータ１３との位置がずれた場合であっても、少なくとも１つの第１リブ３４ａが、第２方向Ｙにおいて凸部１２ｄに重なる状体を良好に維持できる。図示しないが、凸部１２ｅもまた、第２方向Ｙにおいて少なくとも１つの第１リブ３４ａに重なっている。凸部１２ｅは、２つ以上の第１リブ３４ａに重なってもよい。 FIG. 7A is an enlarged view of the region surrounded by the alternate long and short dash line shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line VIIb-VIIb of FIG. 7A. Is. As shown in FIGS. 7A and 7B, the first rib 34a included in the thick portion TP1 overlaps the convex portion 12d in the second direction Y. In this embodiment, at least two first ribs 34a overlap the convex portion 12d in the second direction Y. Therefore, even when the positions of the negative electrode 12 and the separator 13 are displaced, the state in which at least one first rib 34a overlaps the convex portion 12d in the second direction Y can be satisfactorily maintained. Although not shown, the convex portion 12e also overlaps with at least one first rib 34a in the second direction Y. The convex portion 12e may overlap with two or more first ribs 34a.
　図８の（ａ）は、図７の（ａ）のVIIIa-VIIIa線に沿った断面図であり、図８の（ｂ）は、図７の（ａ）のVIIIb-VIIIb線に沿った断面図である。図７の（ａ）及び図８の（ａ）に示されるように、セパレータ１３の屈曲部４４が、凸部１２ｄに当接している。本実施形態では図７の（ｂ）及び図８の（ｂ）に示されるように、先端面１２ｆ、第１角１２ｉ及び第２角１２ｊは、基部３１に対して離間しているが、これに限られない。基部３１の一部が先端面１２ｆ、第１角１２ｉ及び第２角１２ｊの少なくとも一つに当接してもよい。図示しないが、凸部１２ｅもまた、肉厚部ＴＰ１に当接している。 8 (a) is a cross-sectional view taken along the line VIIIa-VIIIa of FIG. 7 (a), and FIG. 8 (b) is a cross-sectional view taken along the line VIIIb-VIIIb of FIG. 7 (a). It is a figure. As shown in (a) of FIG. 7 and (a) of FIG. 8, the bent portion 44 of the separator 13 is in contact with the convex portion 12d. In the present embodiment, as shown in (b) of FIG. 7 and (b) of FIG. 8, the tip surface 12f, the first angle 12i, and the second angle 12j are separated from the base 31, but they are separated from each other. Not limited to. A part of the base portion 31 may abut on at least one of the tip surface 12f, the first corner 12i and the second corner 12j. Although not shown, the convex portion 12e is also in contact with the thick portion TP1.
　図９は、蓄電池の要部拡大断面図である。図９においては、電解液及び正極は省略されている。図９に示されるように、電池構成要素に含まれ、且つ、セパレータ１３に包まれる負極１２が、ケース７の本体２０に収容されるとき、負極１２の凸部１２ｄ，１２ｅが本体２０の底部２４に対向する。本実施形態では、凸部１２ｄは、第２方向Ｙにおいて底部２４上のクラ２５に対向し、且つ、凸部１２ｄとクラ２５との間にはセパレータ１３が位置する。よって、セパレータ１３は、第２方向Ｙにおいて凸部１２ｄとクラ２５とによって挟まれる。本実施形態では、セパレータ１３の肉厚部ＴＰ１が、第２方向Ｙにおいて凸部１２ｄとクラ２５の第１骨部２６とによって挟まれる。このとき、凸部１２ｄには第１リブ３４ａが接触し、クラ２５には第２リブ３４ｂが接触する。セパレータ１３の基部３１は、凸部１２ｄとクラ２５との少なくとも一方に接してもよいし、凸部１２ｄとクラ２５との両方に対して離間してもよい。なお図示しないが、凸部１２ｅは、凸部１２ｄと同様に、第２方向Ｙにおいてクラ２５に対向しており、且つ、肉厚部ＴＰ１が第２方向Ｙにおいて凸部１２ｅとクラ２５の別の第１骨部２６とによって挟まれる。セパレータ１３の基部３１は、凸部１２ｅとクラ２５との少なくとも一方に接してもよいし、凸部１２ｅとクラ２５との両方に対して離間してもよい。 FIG. 9 is an enlarged cross-sectional view of a main part of the storage battery. In FIG. 9, the electrolytic solution and the positive electrode are omitted. As shown in FIG. 9, when the negative electrode 12 included in the battery component and wrapped in the separator 13 is housed in the main body 20 of the case 7, the convex portions 12d and 12e of the negative electrode 12 are the bottom portion of the main body 20. Facing 24. In the present embodiment, the convex portion 12d faces the bracket 25 on the bottom portion 24 in the second direction Y, and the separator 13 is located between the convex portion 12d and the bracket 25. Therefore, the separator 13 is sandwiched between the convex portion 12d and the bracket 25 in the second direction Y. In the present embodiment, the thick portion TP1 of the separator 13 is sandwiched between the convex portion 12d and the first bone portion 26 of the bracket 25 in the second direction Y. At this time, the first rib 34a comes into contact with the convex portion 12d, and the second rib 34b comes into contact with the clasp 25. The base 31 of the separator 13 may be in contact with at least one of the convex portion 12d and the clasp 25, or may be separated from both the convex portion 12d and the clasp 25. Although not shown, the convex portion 12e faces the bracket 25 in the second direction Y like the convex portion 12d, and the thick portion TP1 is separated from the convex portion 12e and the bracket 25 in the second direction Y. It is sandwiched by the first bone portion 26 of the above. The base 31 of the separator 13 may be in contact with at least one of the convex portion 12e and the clasp 25, or may be separated from both the convex portion 12e and the clasp 25.
　続いて、本実施形態における蓄電池１の製造方法の一例を簡潔に説明する。まず、セパレータシート３０及び負極１２を準備する。このとき、セパレータシート３０の第１主面３１ａと負極１２とを対向させる。続いて、セパレータシート３０を二つ折りすることによって、屈曲部４４を形成すると共にセパレータシート３０によって負極１２を挟み込む。このとき、負極１２の負極格子体１２ａがセパレータシート３０にて完全に覆われると共に、負極１２の耳部１２ｂの一部がセパレータシート３０から露出する。続いて、セパレータシート３０にシール部４２，４３及び接合部４５を形成する。シール部４２，４３は、例えば、ギアシール等によって形成される。接合部４５は、例えば、ホーンを含む超音波溶着装置を用いた超音波溶着等によって形成される。接合部４５の形成時、少なくとも第２方向Ｙにてセパレータシート３０が接合部４５に引き寄せられる。セパレータシート３０に屈曲部４４が形成されていることから、セパレータシート３０には少なくとも第２方向Ｙにおける張力が生じる。これにより、セパレータシート３０の一部が負極１２の凸部１２ｄ，１２ｅに押し当てられる。続いて、屈曲部４４に開口部４４ａを形成することによって、負極１２を包むセパレータ１３が形成される。セパレータ１３に包まれる負極１２は、例えば、ベルトコンベア等の搬送装置によって搬送される。このとき、セパレータ１３に包まれる負極１２は、当該搬送装置上にて寝かされる。換言すると、負極１２の凸部１２ｄ，１２ｅの突出方向が高さ方向に直交するように、セパレータ１３に包まれる負極１２は、上記搬送装置上に配置される。上述したように、凸部１２ｄ，１２ｅのそれぞれは、負極格子体１２ａの一端Ａ１と他端Ａ２との間に位置することから、凸部１２ｄ，１２ｅは、上記搬送装置から離間し得る。 Subsequently, an example of the manufacturing method of the storage battery 1 in the present embodiment will be briefly described. First, the separator sheet 30 and the negative electrode 12 are prepared. At this time, the first main surface 31a of the separator sheet 30 and the negative electrode 12 are opposed to each other. Subsequently, the separator sheet 30 is folded in half to form the bent portion 44, and the negative electrode 12 is sandwiched by the separator sheet 30. At this time, the negative electrode lattice body 12a of the negative electrode 12 is completely covered with the separator sheet 30, and a part of the selvage portion 12b of the negative electrode 12 is exposed from the separator sheet 30. Subsequently, the seal portions 42, 43 and the joint portion 45 are formed on the separator sheet 30. The seal portions 42 and 43 are formed by, for example, a gear seal or the like. The joint portion 45 is formed by, for example, ultrasonic welding using an ultrasonic welding device including a horn. At the time of forming the joint portion 45, the separator sheet 30 is attracted to the joint portion 45 at least in the second direction Y. Since the bent portion 44 is formed on the separator sheet 30, tension is generated in the separator sheet 30 at least in the second direction Y. As a result, a part of the separator sheet 30 is pressed against the convex portions 12d and 12e of the negative electrode 12. Subsequently, by forming the opening 44a in the bent portion 44, the separator 13 that encloses the negative electrode 12 is formed. The negative electrode 12 wrapped in the separator 13 is conveyed by a conveyor such as a belt conveyor. At this time, the negative electrode 12 wrapped in the separator 13 is laid down on the transfer device. In other words, the negative electrode 12 wrapped in the separator 13 is arranged on the transport device so that the protruding directions of the convex portions 12d and 12e of the negative electrode 12 are orthogonal to the height direction. As described above, since each of the convex portions 12d and 12e is located between one end A1 and the other end A2 of the negative electrode lattice body 12a, the convex portions 12d and 12e can be separated from the above-mentioned transport device.
　次に、正極１０と、セパレータ１３に包まれる負極１２とのそれぞれを複数準備する。続いて、正極１０と当該負極１２とを交互に積層する。続いて、正極ストラップ１７を介して正極１０の耳部１０ａ同士を電気的に接続させると共に、負極ストラップ１８を介して負極１２の耳部１２ｂ同士を電気的に接続させる。これにより、複数の正極１０と、複数の負極１２と、複数のセパレータ１３が含まれる電極群３を形成する。続いて、電極群３を本体２０に収容する。このとき、負極１２の凸部１２ｄ，１２ｅのそれぞれは、底部２４上のクラ２５上に配置される。続いて、本体２０を蓋２２によって封止する。このとき、各正極１０を正極端子５Ａと電気的に接続させると共に、各負極１２を負極端子５Ｂと電気的に接続させる。続いて、補水栓６を介して電解液をケース７内に供給する。これにより、蓄電池１が製造される。 Next, prepare a plurality of each of the positive electrode 10 and the negative electrode 12 wrapped in the separator 13. Subsequently, the positive electrode 10 and the negative electrode 12 are alternately laminated. Subsequently, the selvage portions 10a of the positive electrode 10 are electrically connected to each other via the positive electrode strap 17, and the selvage portions 12b of the negative electrode 12 are electrically connected to each other via the negative electrode strap 18. As a result, the electrode group 3 including the plurality of positive electrodes 10, the plurality of negative electrodes 12, and the plurality of separators 13 is formed. Subsequently, the electrode group 3 is housed in the main body 20. At this time, each of the convex portions 12d and 12e of the negative electrode 12 is arranged on the bracket 25 on the bottom portion 24. Subsequently, the main body 20 is sealed with the lid 22. At this time, each positive electrode 10 is electrically connected to the positive electrode terminal 5A, and each negative electrode 12 is electrically connected to the negative electrode terminal 5B. Subsequently, the electrolytic solution is supplied into the case 7 via the refill plug 6. As a result, the storage battery 1 is manufactured.
　以上に説明した本実施形態に係る蓄電池１に含まれる電池構成要素では、負極１２の凸部１２ｄ，１２ｅのそれぞれはセパレータ１３に覆われる。蓄電池１を製造するために、当該電池構成要素をケース７の本体２０に収容する場合等にて、本体２０の底部２４には負極１２の凸部１２ｄ，１２ｅが当接する。このため、セパレータ１３のうち凸部１２ｄ，１２ｅに当接する部分に荷重が集中する傾向がある。ここで本実施形態では、セパレータ１３の肉厚部ＴＰ１が凸部１２ｄ，１２ｅに当接する。これにより、セパレータ１３のうち凸部１２ｄ，１２ｅに当接する部分の耐荷重性能が良好に向上する。したがって本実施形態によれば、セパレータ１３の破損を良好に防止可能である。 In the battery component included in the storage battery 1 according to the present embodiment described above, each of the convex portions 12d and 12e of the negative electrode 12 is covered with the separator 13. When the battery component is housed in the main body 20 of the case 7 in order to manufacture the storage battery 1, the convex portions 12d and 12e of the negative electrode 12 abut on the bottom 24 of the main body 20. Therefore, the load tends to be concentrated on the portions of the separator 13 that come into contact with the convex portions 12d and 12e. Here, in the present embodiment, the thick portion TP1 of the separator 13 comes into contact with the convex portions 12d and 12e. As a result, the load-bearing performance of the portions of the separator 13 that come into contact with the convex portions 12d and 12e is satisfactorily improved. Therefore, according to the present embodiment, damage to the separator 13 can be satisfactorily prevented.
　加えて、本実施形態では、肉厚部ＴＰ１が負極１２の凸部１２ｄ，１２ｅに当接する。これによって、セパレータ１３の基部３１にて第１リブ３４ａが設けられない部分は、凸部１２ｄ，１２ｅに当接しにくくなる。このため、セパレータ１３のうち耐荷重性能が比較的低い部分（すなわち、セパレータ１３のうちリブ３４が設けられない部分）には、凸部１２ｄ，１２ｅからの荷重が加わりにくい。したがって本実施形態では、上述した通り、セパレータ１３の破損を良好に防止可能である。 In addition, in the present embodiment, the thick portion TP1 abuts on the convex portions 12d and 12e of the negative electrode 12. As a result, the portion of the base portion 31 of the separator 13 where the first rib 34a is not provided is less likely to come into contact with the convex portions 12d and 12e. Therefore, it is difficult for the load from the convex portions 12d and 12e to be applied to the portion of the separator 13 having a relatively low load-bearing performance (that is, the portion of the separator 13 where the rib 34 is not provided). Therefore, in the present embodiment, as described above, damage to the separator 13 can be satisfactorily prevented.
　本実施形態では、セパレータ１３は、負極１２に対向する第１主面３１ａを備え、肉厚部ＴＰ１は、第１主面３１ａから負極１２に向かって突出する第１リブ３４ａを有し、第１リブ３４ａは、凸部１２ｄに当接する。この場合、セパレータ１３の基部３１が凸部１２ｄに当接しにくくなる。加えて、凸部１２ｄは、２つ以上の第１リブ３４ａに当接している。この場合、セパレータ１３の基部３１が凸部１２ｄにより当接しにくくなる。 In the present embodiment, the separator 13 includes a first main surface 31a facing the negative electrode 12, and the thick portion TP1 has a first rib 34a protruding from the first main surface 31a toward the negative electrode 12. The 1 rib 34a abuts on the convex portion 12d. In this case, the base portion 31 of the separator 13 is less likely to come into contact with the convex portion 12d. In addition, the convex portion 12d is in contact with two or more first ribs 34a. In this case, the base portion 31 of the separator 13 is less likely to come into contact with the convex portion 12d.
　本実施形態では、セパレータ１３は、第１主面３１ａの反対側に位置する第２主面３１ｂを備え、肉厚部ＴＰ１は、第２主面３１ｂから第１リブ３４ａと反対側に突出する第２リブ３４ｂを有する。例えば、電池構成要素がケース７の本体２０に収容される場合等にて、セパレータ１３において凸部１２ｄと本体２０の底部２４とに挟まれる部分の破損を良好に防止可能である。加えて本実施形態では、セパレータ１３において凸部１２ｅと底部２４とに挟まれる部分の破損も良好に防止可能である。 In the present embodiment, the separator 13 includes a second main surface 31b located on the opposite side of the first main surface 31a, and the thick portion TP1 projects from the second main surface 31b on the opposite side to the first rib 34a. It has a second rib 34b. For example, when the battery component is housed in the main body 20 of the case 7, it is possible to satisfactorily prevent damage to the portion of the separator 13 sandwiched between the convex portion 12d and the bottom portion 24 of the main body 20. In addition, in the present embodiment, it is possible to satisfactorily prevent damage to the portion of the separator 13 sandwiched between the convex portion 12e and the bottom portion 24.
　本実施形態では、セパレータ１３は、第２方向Ｙにおける負極１２の凸部１２ｄ，１２ｒ側にて折り返される。このため、セパレータ１３の屈曲部４４及びその周囲によって凸部１２ｄ，１２ｅが良好に覆われ得る。 In the present embodiment, the separator 13 is folded back at the convex portions 12d and 12r of the negative electrode 12 in the second direction Y. Therefore, the convex portions 12d and 12e can be well covered by the bent portion 44 of the separator 13 and its surroundings.
　本実施形態では、セパレータ１３は、第２方向Ｙにおける負極１２の凸部１２ｄ，１２ｅ側に位置する開口部４４ａを有する。例えば、電池構成要素を含む電極群３及び電解液がケース７に収容される場合、当該電解液が電極群３内を流動しやすくなる。 In the present embodiment, the separator 13 has an opening 44a located on the convex portions 12d and 12e side of the negative electrode 12 in the second direction Y. For example, when the electrode group 3 including the battery component and the electrolytic solution are housed in the case 7, the electrolytic solution easily flows in the electrode group 3.
　本実施形態では、凸部１２ｄの第１角１２ｉ及び第２角１２ｊは、面取りされている。この場合、例えば凸部１２ｄに面取りされていない角が設けられる態様と比較して、肉厚部ＴＰ１の特定箇所に対する凸部１２ｄからの荷重集中を抑制できる。図示しないが、本実施形態では、凸部１２ｅの角もまた面取りされ得る。このため、肉厚部ＴＰ１の特定箇所に対する凸部１２ｅからの荷重集中も抑制できる。 In the present embodiment, the first corner 12i and the second corner 12j of the convex portion 12d are chamfered. In this case, the load concentration from the convex portion 12d to the specific portion of the thick portion TP1 can be suppressed as compared with the embodiment in which the convex portion 12d is provided with an unchamfered angle, for example. Although not shown, in the present embodiment, the corners of the convex portion 12e can also be chamfered. Therefore, it is possible to suppress the load concentration from the convex portion 12e to the specific portion of the thick portion TP1.
　本実施形態では、第１方向Ｘにおける凸部１２ｄの厚さＴ１は、第１方向Ｘにおける負極１２の最大厚さＴ３よりも小さく、凸部１２ｄは、第１方向Ｘにおける負極１２の負極格子体１２ａの一端Ａ１と他端Ａ２との間に位置する。例えば、セパレータ１３に包まれる負極１２を寝かせ、当該負極１２をベルトコンベア等の搬送装置を用いて搬送する場合、凸部１２ｄが搬送装置から離間する。このため、セパレータ１３が凸部１２ｄと搬送装置に挟まれにくくなる。よって、セパレータ１３に包まれる負極１２の搬送時における凸部１２ｄに起因したセパレータ１３の破損を抑制できる。加えて本実施形態では、上記搬送時における凸部１２ｅに起因したセパレータ１３の破損も抑制できる。 In the present embodiment, the thickness T1 of the convex portion 12d in the first direction X is smaller than the maximum thickness T3 of the negative electrode 12 in the first direction X, and the convex portion 12d is the negative electrode lattice of the negative electrode 12 in the first direction X. It is located between one end A1 and the other end A2 of the body 12a. For example, when the negative electrode 12 wrapped in the separator 13 is laid down and the negative electrode 12 is conveyed by using a conveying device such as a belt conveyor, the convex portion 12d is separated from the conveying device. Therefore, the separator 13 is less likely to be sandwiched between the convex portion 12d and the transport device. Therefore, it is possible to suppress damage to the separator 13 due to the convex portion 12d during transportation of the negative electrode 12 wrapped in the separator 13. In addition, in the present embodiment, damage to the separator 13 due to the convex portion 12e during the transportation can be suppressed.
　本実施形態に係る正極１０、負極１２及びセパレータ１３を含む電池構成要素が利用される蓄電池１を用いることによって、セパレータ１３の破損を良好に防止可能である。このため、セパレータ１３を介して互いに積層される正極１０と負極１２との短絡を良好に抑制可能である。加えて本実施形態では、ケース７は、底部２４上に設けられると共に第２方向Ｙに沿って突出するクラ２５を有し、肉厚部ＴＰ１は、凸部１２ｄとクラ２５とによって挟まれる。このため、凸部１２ｄとクラ２５との間に肉厚部ＴＰ１が挟まれることによって、セパレータ１３の破損が抑制される。さらには本実施形態では、第３方向Ｚにおける凸部１２ｄの寸法Ｓ１は、第３方向Ｚにおけるクラ２５の寸法Ｓ３以下である。このため、セパレータ１３に包まれる負極１２をケース７に収容するときに凸部１２ｄからクラ２５の特定箇所に荷重が集中しにくくなる。このため、肉厚部ＴＰ１が良好に破損しにくくなる。 By using the storage battery 1 in which the battery components including the positive electrode 10, the negative electrode 12, and the separator 13 according to the present embodiment are used, damage to the separator 13 can be satisfactorily prevented. Therefore, it is possible to satisfactorily suppress a short circuit between the positive electrode 10 and the negative electrode 12 that are laminated to each other via the separator 13. In addition, in the present embodiment, the case 7 has a clasp 25 provided on the bottom portion 24 and projecting along the second direction Y, and the thick portion TP1 is sandwiched between the convex portions 12d and the clasp 25. Therefore, the thick portion TP1 is sandwiched between the convex portion 12d and the bracket 25, so that the separator 13 is prevented from being damaged. Further, in the present embodiment, the dimension S1 of the convex portion 12d in the third direction Z is equal to or less than the dimension S3 of the bracket 25 in the third direction Z. Therefore, when the negative electrode 12 wrapped in the separator 13 is housed in the case 7, the load is less likely to be concentrated from the convex portion 12d to the specific portion of the bracket 25. Therefore, the thick portion TP1 is satisfactorily less likely to be damaged.
　以下では、図１０及び図１１を参照しながら、上記実施形態の変形例について説明する。以下の変形例において、上記実施形態と重複する箇所の説明は省略する。したがって以下では、上記実施形態と異なる箇所を主に説明する。 Hereinafter, a modified example of the above embodiment will be described with reference to FIGS. 10 and 11. In the following modification, the description of the part overlapping with the above embodiment will be omitted. Therefore, in the following, the parts different from the above-described embodiment will be mainly described.
　図１０の（ａ）は、第１変形例に係るセパレータ及び負極の要部拡大断面図である。図１０の（ａ）に示されるように、セパレータ１３Ａに設けられる第１リブ３４ａと第２リブ３４ｂとは、基部３１の厚さ方向において互いに重なっていない。第１変形例では、第２リブ３４ｂは、第３方向Ｚにおいて隣り合う２つの第１リブ３４ａの間に位置する。セパレータ１３Ａは、第１リブ３４ａを含む肉厚部ＴＰ２と、第２リブ３４ｂを含む肉厚部ＴＰ３とを有する。肉厚部ＴＰ２の厚さは、基部３１の厚さと第１リブ３４ａの高さとの合計に相当する。肉厚部ＴＰ３の厚さは、基部３１の厚さと第２リブ３４ｂの高さとの合計に相当する。第１変形例では、電極群３がケース７の本体２０に収容されるとき、肉厚部ＴＰ２は負極１２（より具体的には、凸部１２ｄ，１２ｅ）に当接し、肉厚部ＴＰ３は本体２０の底部２４（より具体的には、クラ２５）に当接する。このような第１変形例においても、上記実施形態と同様の作用効果が奏され得る。 FIG. 10A is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the first modification. As shown in FIG. 10A, the first rib 34a and the second rib 34b provided on the separator 13A do not overlap each other in the thickness direction of the base 31. In the first modification, the second rib 34b is located between two adjacent first ribs 34a in the third direction Z. The separator 13A has a thick portion TP2 including the first rib 34a and a thick portion TP3 including the second rib 34b. The thickness of the thick portion TP2 corresponds to the sum of the thickness of the base 31 and the height of the first rib 34a. The thickness of the thick portion TP3 corresponds to the sum of the thickness of the base 31 and the height of the second rib 34b. In the first modification, when the electrode group 3 is housed in the main body 20 of the case 7, the thick portion TP2 abuts on the negative electrode 12 (more specifically, the convex portions 12d and 12e), and the thick portion TP3 It abuts on the bottom 24 (more specifically, the class 25) of the main body 20. Even in such a first modification, the same action and effect as those of the above embodiment can be achieved.
　図１０の（ｂ）は、第２変形例に係るセパレータ及び負極の要部拡大断面図である。図１０の（ｂ）に示されるように、クラ２５Ａに含まれる第１骨部２６Ａの第３方向Ｚに沿った寸法Ｓ４は、凸部１２ｄの寸法Ｓ１よりも大きい。換言すると、第３方向Ｚにおける凸部１２ｄの寸法Ｓ１は、第３方向Ｚにおけるクラ２５Ａの寸法Ｓ４よりも小さい。また図示しないが、寸法Ｓ４は、凸部１２ｅの寸法Ｓ２（図２を参照）よりも大きい。このような第２変形例においても、上記実施形態と同様の作用効果が奏される。加えて、ケース７における負極１２の位置がずれた場合であっても、肉厚部ＴＰ１が凸部１２ｄとクラ２５Ａとの間に挟まれやすい。同様に、第３方向Ｚにおける凸部１２ｅの寸法Ｓ２は、第３方向Ｚにおけるクラ２５Ａの寸法Ｓ４よりも小さいので、肉厚部ＴＰ１が凸部１２ｅとクラ２５Ａとの間に挟まれやすい。 FIG. 10B is an enlarged cross-sectional view of a main part of the separator and the negative electrode according to the second modification. As shown in FIG. 10B, the dimension S4 along the third direction Z of the first bone portion 26A included in the bracket 25A is larger than the dimension S1 of the convex portion 12d. In other words, the dimension S1 of the convex portion 12d in the third direction Z is smaller than the dimension S4 of the bracket 25A in the third direction Z. Although not shown, the dimension S4 is larger than the dimension S2 (see FIG. 2) of the convex portion 12e. Also in such a second modification, the same action and effect as those of the above embodiment are exhibited. In addition, even when the position of the negative electrode 12 in the case 7 is displaced, the thick portion TP1 is likely to be sandwiched between the convex portion 12d and the bracket 25A. Similarly, since the dimension S2 of the convex portion 12e in the third direction Z is smaller than the dimension S4 of the Kura 25A in the third direction Z, the thick portion TP1 is likely to be sandwiched between the convex portion 12e and the Kura 25A.
　図１１は、第３変形例に係るセパレータに包まれる負極を示す平面図である。図１１に示されるように、セパレータ１３Ｂは、上記実施形態及び上記変形例と異なり、第２方向Ｙにおいて負極１２の凸部１２ｄ，１２ｅに対向する屈曲部を有さない。このため第３変形例では、セパレータ１３Ｂは、２枚のセパレータシート３０から構成される。例えば、第１方向Ｘにおいて負極１２の一端側に位置するセパレータシート３０（以下では「第１セパレータシート」と称することがある）と、第１方向Ｘにおいて負極１２の他端側に位置するセパレータシート３０（以下では「第２セパレータシート」と称することがある）とが、シール部４２，４３等にて互いに接合されることによって、セパレータ１３Ｂが形成される。第１セパレータシートは、第１方向Ｘにおける負極１２の一端に接し得る位置に配置される。第２セパレータシートは、第１方向Ｘにおける負極１２の他端に接し得る位置に配置される。 FIG. 11 is a plan view showing a negative electrode wrapped in the separator according to the third modification. As shown in FIG. 11, unlike the above-described embodiment and the above-mentioned modification, the separator 13B does not have a bent portion facing the convex portions 12d and 12e of the negative electrode 12 in the second direction Y. Therefore, in the third modification, the separator 13B is composed of two separator sheets 30. For example, a separator sheet 30 located on one end side of the negative electrode 12 in the first direction X (hereinafter, may be referred to as a “first separator sheet”) and a separator located on the other end side of the negative electrode 12 in the first direction X. The separator 13B is formed by joining the sheet 30 (hereinafter, may be referred to as a "second separator sheet") to each other at the sealing portions 42, 43 and the like. The first separator sheet is arranged at a position where it can come into contact with one end of the negative electrode 12 in the first direction X. The second separator sheet is arranged at a position where it can come into contact with the other end of the negative electrode 12 in the first direction X.
　セパレータ１３Ｂは、上記屈曲部の代わりに、接合部４５に加えて、第２方向Ｙにおいて負極１２に対向する接合部５１，５２を有する。接合部５１，５２のそれぞれは、セパレータ１３Ｂの一部（第１部分）と他の一部（第２部分）とが互いに接合する部分である。セパレータ１３Ｂの一部は第１セパレータシートに含まれ、セパレータ１３Ｂの他の一部は第２セパレータシートに含まれる。接合部５１は第２方向Ｙにおいて凸部１２ｄに対向し、接合部５２は第２方向Ｙにおいて凸部１２ｅに対向する。凸部１２ｄの露出を防止する観点から、第３方向Ｚにおける接合部５１の寸法Ｓ５は、凸部１２ｄの寸法Ｓ１以上である。換言すると、接合部５１に相当する上記第１部分ならびに上記第２部分の第３方向Ｚに沿った寸法は、凸部１２ｄの寸法Ｓ１以上である。凸部１２ｅの露出を防止する観点から、第３方向Ｚにおける接合部５２の寸法Ｓ６は、凸部１２ｅの寸法Ｓ２以上である。換言すると、換言すると、接合部５２に相当する上記第１部分ならびに上記第２部分の第３方向Ｚに沿った寸法は、凸部１２ｅの寸法Ｓ２以上である。 The separator 13B has joints 51 and 52 facing the negative electrode 12 in the second direction Y in addition to the joint 45 instead of the bent portion. Each of the joint portions 51 and 52 is a portion where a part (first part) of the separator 13B and another part (second part) are joined to each other. A part of the separator 13B is included in the first separator sheet, and the other part of the separator 13B is included in the second separator sheet. The joint portion 51 faces the convex portion 12d in the second direction Y, and the joint portion 52 faces the convex portion 12e in the second direction Y. From the viewpoint of preventing the convex portion 12d from being exposed, the dimension S5 of the joint portion 51 in the third direction Z is equal to or larger than the dimension S1 of the convex portion 12d. In other words, the dimensions of the first portion and the second portion corresponding to the joint portion 51 along the third direction Z are equal to or larger than the dimension S1 of the convex portion 12d. From the viewpoint of preventing the convex portion 12e from being exposed, the dimension S6 of the joint portion 52 in the third direction Z is equal to or larger than the dimension S2 of the convex portion 12e. In other words, the dimension of the first portion and the second portion corresponding to the joint portion 52 along the third direction Z is equal to or larger than the dimension S2 of the convex portion 12e.
　接合部５１，５２のそれぞれは、第３方向Ｚに沿って延在している。接合部５１は、接合部４５と同様に、第３方向Ｚにおけるセパレータ１３Ｂの一端から他端に向かって延在しており、主部４１及びシール部４２に設けられる。接合部５２は、第３方向Ｚの他端から一端に向かって延在しており、主部４１及びシール部４２に設けられる。接合部５１，５２は、第３方向Ｚにおいて並んでおり、且つ、互いに離間している。第３方向Ｚにおける接合部５１，５２の間には、開口部５３が設けられる。開口部５３は、セパレータ１３Ｂのうち第１セパレータシートと第２セパレータシートとが互いに接合していない部分である。開口部５３は、第２方向Ｙにおいて凸部１２ｄ，１２ｅ側に位置する。換言すると、開口部５３は、第２方向Ｙにおいて、耳部１２ｂよりも凸部１２ｄ，１２ｅに近い。開口部５３は、第２方向Ｙにおいて凸部１２ｄ，１２ｅに重なっていない。 Each of the joint portions 51 and 52 extends along the third direction Z. Like the joint portion 45, the joint portion 51 extends from one end to the other end of the separator 13B in the third direction Z, and is provided on the main portion 41 and the seal portion 42. The joint portion 52 extends from the other end of the third direction Z toward one end, and is provided on the main portion 41 and the seal portion 42. The joint portions 51 and 52 are aligned in the third direction Z and are separated from each other. An opening 53 is provided between the joints 51 and 52 in the third direction Z. The opening 53 is a portion of the separator 13B where the first separator sheet and the second separator sheet are not joined to each other. The opening 53 is located on the convex portions 12d and 12e side in the second direction Y. In other words, the opening 53 is closer to the convex portions 12d and 12e than the selvage portion 12b in the second direction Y. The opening 53 does not overlap the convex portions 12d and 12e in the second direction Y.
　接合部５１，５２によるセパレータシート同士の接合を強固にする観点から、接合部５１，５２のそれぞれは、例えば、第１セパレータシートと第２セパレータシートとが互いに溶着された部分である。溶着不良の防止の観点から、接合部５１，５２のそれぞれは、超音波溶着等によって形成されてもよい。接合部５１，５２のそれぞれは、シール部４２，４３の形成後に設けられてもよいし、シール部４２，４３の形成前に設けられてもよい。 From the viewpoint of strengthening the bonding between the separator sheets by the joining portions 51 and 52, each of the joining portions 51 and 52 is, for example, a portion where the first separator sheet and the second separator sheet are welded to each other. From the viewpoint of preventing poor welding, each of the joint portions 51 and 52 may be formed by ultrasonic welding or the like. Each of the joint portions 51 and 52 may be provided after the formation of the seal portions 42 and 43, or may be provided before the formation of the seal portions 42 and 43.
　以上に説明した第３変形例においても、上記実施形態と同様の作用効果が奏され得る。なお第３変形例では、セパレータ１３Ｂは２枚のセパレータシート３０から構成されるが、これに限られない。例えば、第３方向Ｚに沿って二つ折りにされたセパレータシートが用いられてもよい。すなわち、１枚のセパレータシートから第３変形例に係るセパレータが形成されてもよい。 Even in the third modification described above, the same action and effect as those of the above embodiment can be achieved. In the third modification, the separator 13B is composed of two separator sheets 30, but the separator 13B is not limited to this. For example, a separator sheet folded in half along the third direction Z may be used. That is, the separator according to the third modification may be formed from one separator sheet.
　本開示の一側面に係る電池構成要素は、上記実施形態及び上記変形例に限られない。上記実施形態及び上記変形例は、適宜組み合わされてもよい。例えば、第１変形例と第２変形例とが組み合わされてもよい。 The battery component according to one aspect of the present disclosure is not limited to the above embodiment and the above modification. The above-described embodiment and the above-mentioned modification may be combined as appropriate. For example, the first modification and the second modification may be combined.
　上記実施形態及び上記変形例では、第１方向から見たリブは直線状に延在しているが、これに限られない。例えば、第１方向から見て、リブは波線状に延在してもよいし、ジグザグ状に延在してもよい。また、リブは、第１方向から見て、点形状（ドット形状）でもよいし、円形状でもよいし、楕円形状でもよいし、多角形状でもよい。もしくは、リブは、多角錐形状でもよいし、多角錐台形状でもよいし、円錐形状でもよいし、円錐台形状でもよい。リブの断面は、半円形状でもよいし、多角形状でもよい。リブは、第２方向に沿って延在してもよいし、第３方向に沿って延在してもよい。第１方向から見て、複数のリブによってフィッシュボーン構造が形成されてもよい。 In the above embodiment and the above modification, the ribs seen from the first direction extend linearly, but the ribs are not limited to this. For example, when viewed from the first direction, the ribs may extend in a wavy pattern or may extend in a zigzag pattern. Further, the rib may have a point shape (dot shape), a circular shape, an elliptical shape, or a polygonal shape when viewed from the first direction. Alternatively, the rib may have a polygonal pyramid shape, a polygonal pyramid shape, a conical shape, or a truncated cone shape. The cross section of the rib may be a semicircular shape or a polygonal shape. The ribs may extend along the second direction or may extend along the third direction. Seen from the first direction, the fishbone structure may be formed by a plurality of ribs.
　上記実施形態及び上記変形例では、肉厚部はリブを含んでいるが、これに限られない。例えば、肉厚部は、セパレータのうち最も薄い部分よりも厚い部分であればよく、リブを含まなくてもよい。セパレータは、リブを有する肉厚部と、リブを有さない肉厚部との両方を有してもよい。 In the above embodiment and the above modification, the thick portion includes ribs, but the thickness is not limited to this. For example, the thick portion may be a portion thicker than the thinnest portion of the separator, and may not include ribs. The separator may have both a thick portion with ribs and a thick portion without ribs.
　上記実施形態、上記第１変形例及び上記第２変形例では、第２方向に沿ってセパレータシートが二つ折りされているが、これに限られない。例えば、電極群の寸法等によっては、第３方向に沿ってセパレータシートが二つ折りされてもよい。この場合、セパレータの屈曲部に開口部が設けられなくてもよい。 In the above-described embodiment, the above-mentioned first modification, and the above-mentioned second modification, the separator sheet is folded in half along the second direction, but the present invention is not limited to this. For example, depending on the dimensions of the electrode group and the like, the separator sheet may be folded in half along the third direction. In this case, the bent portion of the separator may not be provided with an opening.
　上記実施形態、上記第１変形例及び上記第２変形例では、セパレータは１枚のセパレータシートから形成されるが、これに限られない。例えば、セパレータは、複数枚のセパレータシートから形成されてもよい。この場合、第３方向におけるセパレータの両端側にシール部が形成されてもよいし、第３方向における一方側のみにシール部が形成されてもよい。また、第２方向におけるセパレータの両側に接合部が形成されることが好ましいが、これに限られない。第２方向における一方側のみに接合部が形成されてもよい。よって、セパレータが複数枚のセパレータシートから形成される場合、当該セパレータは、袋状加工物でもよいし、筒状加工物でもよいし、袋状加工物及び筒状加工物とは異なる加工物でもよい。 In the above-described embodiment, the above-mentioned first modification, and the above-mentioned second modification, the separator is formed from one separator sheet, but is not limited thereto. For example, the separator may be formed from a plurality of separator sheets. In this case, seal portions may be formed on both ends of the separator in the third direction, or seal portions may be formed on only one side in the third direction. Further, it is preferable, but not limited to, joint portions are formed on both sides of the separator in the second direction. A joint may be formed on only one side in the second direction. Therefore, when the separator is formed from a plurality of separator sheets, the separator may be a bag-shaped processed product, a tubular processed product, or a processed product different from the bag-shaped processed product and the tubular processed product. good.
　１…蓄電池、３…電極群、５Ａ…正極端子、５Ｂ…負極端子、７…ケース、１０…正極（第２極板）、１０ａ…耳部、１２…負極（第１極板）、１２ａ…負極格子体、１２ｂ…耳部、１２ｃ…負極材、１２ｄ，１２ｅ…凸部、１２ｉ…第１角（角）、１２ｊ…第２角（角）、１３，１３Ａ，１３Ｂ…セパレータ、２０…本体、２２…蓋、２４…底部、２５，２５Ａ…クラ、３０…セパレータシート、３１…基部、３１ａ…第１主面、３１ｂ…第２主面、３２，３３…縁部、３４…リブ、３４ａ…第１リブ、３４ｂ…第２リブ、４１…主部、４２，４３…シール部、４４…屈曲部、４４ａ…開口部、４５，５１，５２…接合部、Ｓ１～Ｓ６…寸法、ＴＰ１，ＴＰ２，ＴＰ３…肉厚部。 1 ... Storage battery, 3 ... Electrode group, 5A ... Positive electrode terminal, 5B ... Negative electrode terminal, 7 ... Case, 10 ... Positive electrode (second electrode plate), 10a ... Ear, 12 ... Negative electrode (first electrode plate), 12a ... Negative electrode lattice, 12b ... Ear, 12c ... Negative electrode material, 12d, 12e ... Convex, 12i ... First corner (corner), 12j ... Second corner (corner), 13, 13A, 13B ... Separator, 20 ... Main body , 22 ... lid, 24 ... bottom, 25, 25A ... class, 30 ... separator sheet, 31 ... base, 31a ... first main surface, 31b ... second main surface, 32, 33 ... edge, 34 ... rib, 34a ... 1st rib, 34b ... 2nd rib, 41 ... Main part, 42, 43 ... Seal part, 44 ... Bending part, 44a ... Opening, 45, 51, 52 ... Joint part, S1 to S6 ... Dimensions, TP1, TP2, TP3 ... Thick part.

Claims (18)

  1. 　第１方向にて互いに重なる第１極板及びセパレータを備え、
    　前記第１極板は、本体部と、前記第１方向に直交する第２方向に沿って前記本体部から突出すると共に前記セパレータに覆われる足部とを有し、
    　前記セパレータは、第１厚さを有する基部と、前記第１厚さよりも厚い第２厚さを有すると共に前記足部に当接する肉厚部とを備える、
    電池構成要素。     It is provided with a first electrode plate and a separator that overlap each other in the first direction.
    The first electrode plate has a main body portion and a foot portion that protrudes from the main body portion and is covered with the separator along a second direction orthogonal to the first direction.
    The separator comprises a base having a first thickness and a thick portion having a second thickness thicker than the first thickness and abutting on the foot.
    Battery component.
  2. 　前記セパレータは、前記第１極板に対向する第１主面をさらに備え、
    　前記肉厚部は、前記第１主面から前記第１極板に向かって突出する第１リブを有し、
    　前記第１リブは、前記足部に当接する、請求項１に記載の電池構成要素。     The separator further comprises a first main surface facing the first electrode plate.
    The thick portion has a first rib protruding from the first main surface toward the first electrode plate.
    The battery component according to claim 1, wherein the first rib abuts on the foot portion.
  3. 　前記肉厚部は、前記第１リブを複数有し、
    　前記足部は、２つ以上の前記第１リブに当接する、請求項２に記載の電池構成要素。     The thick portion has a plurality of the first ribs, and the thick portion has a plurality of the first ribs.
    The battery component according to claim 2, wherein the foot portion abuts on two or more of the first ribs.
  4. 　前記セパレータは、前記第１主面の反対側に位置する第２主面をさらに備え、
    　前記肉厚部は、前記第２主面から前記第１リブと反対側に突出する第２リブを有する、請求項２または３に記載の電池構成要素。     The separator further comprises a second main surface located on the opposite side of the first main surface.
    The battery component according to claim 2 or 3, wherein the thick portion has a second rib protruding from the second main surface to the opposite side of the first rib.
  5. 　前記セパレータの第１部分と第２部分とが互いに接合されており、
    　前記第１部分と前記第２部分とのそれぞれは、前記第２方向において前記足部に対向している、請求項１～４のいずれか一項に記載の電池構成要素。     The first part and the second part of the separator are joined to each other.
    The battery component according to any one of claims 1 to 4, wherein each of the first portion and the second portion faces the foot portion in the second direction.
  6. 　前記第１部分と前記第２部分とは、互いに溶着されている、請求項５に記載の電池構成要素。 The battery component according to claim 5, wherein the first portion and the second portion are welded to each other.
  7. 　前記第１方向及び前記第２方向に直交する第３方向における前記第１部分及び前記第２部分の寸法は、前記第３方向における前記足部の寸法以上である、請求項５又は６に記載の電池構成要素。 5. The aspect of claim 5 or 6, wherein the dimensions of the first portion and the second portion in the first direction and the third direction orthogonal to the second direction are equal to or larger than the dimensions of the foot portion in the third direction. Battery components.
  8. 　前記セパレータは、前記第２方向における前記第１極板の前記足部側にて折り返されている、請求項１～４のいずれか一項に記載の電池構成要素。 The battery component according to any one of claims 1 to 4, wherein the separator is folded back on the foot side of the first electrode plate in the second direction.
  9. 　前記セパレータは、前記第２方向における前記第１極板の前記足部側に位置する開口部を有する、請求項５～８のいずれか一項に記載の電池構成要素。 The battery component according to any one of claims 5 to 8, wherein the separator has an opening located on the foot side of the first electrode plate in the second direction.
  10. 　前記足部の角は、面取りされている、請求項１～９のいずれか一項に記載の電池構成要素。 The battery component according to any one of claims 1 to 9, wherein the corner of the foot is chamfered.
  11. 　前記第１方向における前記足部の厚さは、前記第１方向における前記第１極板の最大厚みの厚さよりも小さく、
    　前記足部は、前記第１方向における前記第１極板の一端と他端との間に位置する、請求項１～１０のいずれか一項に記載の電池構成要素。     The thickness of the foot in the first direction is smaller than the thickness of the maximum thickness of the first electrode in the first direction.
    The battery component according to any one of claims 1 to 10, wherein the foot portion is located between one end and the other end of the first electrode plate in the first direction.
  12. 　請求項１～１１のいずれか一項に記載の電池構成要素と、
    　前記電池構成要素が収容される電槽と、
    を備え、
    　前記電池構成要素は、前記第１方向において前記セパレータを介して前記第１極板に積層される第２極板をさらに有し、
    　前記肉厚部は、前記足部と前記電槽の底部とに挟まれる、
    蓄電池。     The battery component according to any one of claims 1 to 11.
    An electric tank in which the battery components are housed, and
    Equipped with
    The battery component further comprises a second electrode plate laminated on the first electrode plate via the separator in the first direction.
    The thick portion is sandwiched between the foot portion and the bottom portion of the electric tank.
    Storage battery.
  13. 　前記電槽は、前記底部上に設けられると共に前記第２方向に沿って突出するクラを有し、
    　前記肉厚部は、前記足部と前記クラとによって挟まれる、請求項１２に記載の蓄電池。     The battery case has a bracket provided on the bottom and protruding along the second direction.
    The storage battery according to claim 12, wherein the thick portion is sandwiched between the foot portion and the clasp.
  14. 　前記第１方向及び前記第２方向に直交する第３方向における前記足部の寸法は、前記第３方向における前記クラの寸法よりも大きい、請求項１３に記載の蓄電池。 The storage battery according to claim 13, wherein the dimension of the foot portion in the first direction and the third direction orthogonal to the second direction is larger than the dimension of the clasp in the third direction.
  15. 　前記第１方向及び前記第２方向に直交する第３方向における前記足部の寸法は、前記第３方向における前記クラの寸法以下である、請求項１３に記載の蓄電池。 The storage battery according to claim 13, wherein the dimension of the foot portion in the first direction and the third direction orthogonal to the second direction is equal to or less than the dimension of the clasp in the third direction.
  16. 　鉛蓄電池である、請求項１２～１５のいずれか一項に記載の蓄電池。 The storage battery according to any one of claims 12 to 15, which is a lead storage battery.
  17. 　請求項１２～１６のいずれか一項に記載の蓄電池を備える組電池。 An assembled battery including the storage battery according to any one of claims 12 to 16.
  18. 　請求項１７に記載の組電池を備える電動車。 An electric vehicle equipped with the assembled battery according to claim 17.
PCT/JP2021/026644 2020-07-28 2021-07-15 Cell constituent element, storage cell, assembled cell, and electric vehicle WO2022024785A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003346767A (en) * 2002-05-30 2003-12-05 Matsushita Electric Ind Co Ltd Separator for storage battery and lead acid storage battery using the same
JP2004127800A (en) * 2002-10-04 2004-04-22 Matsushita Electric Ind Co Ltd Lead-acid battery
JP2010140772A (en) * 2008-12-12 2010-06-24 Panasonic Corp Lead storage battery
JP2017069023A (en) * 2015-09-30 2017-04-06 株式会社Ｇｓユアサ Lead storage battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003346767A (en) * 2002-05-30 2003-12-05 Matsushita Electric Ind Co Ltd Separator for storage battery and lead acid storage battery using the same
JP2004127800A (en) * 2002-10-04 2004-04-22 Matsushita Electric Ind Co Ltd Lead-acid battery
JP2010140772A (en) * 2008-12-12 2010-06-24 Panasonic Corp Lead storage battery
JP2017069023A (en) * 2015-09-30 2017-04-06 株式会社Ｇｓユアサ Lead storage battery

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