WO2013018552A1 - Battery - Google Patents

Battery Download PDF

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Publication number
WO2013018552A1
WO2013018552A1 PCT/JP2012/068318 JP2012068318W WO2013018552A1 WO 2013018552 A1 WO2013018552 A1 WO 2013018552A1 JP 2012068318 W JP2012068318 W JP 2012068318W WO 2013018552 A1 WO2013018552 A1 WO 2013018552A1
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WO
WIPO (PCT)
Prior art keywords
terminal
electrode terminal
negative electrode
positive electrode
positive
Prior art date
Application number
PCT/JP2012/068318
Other languages
French (fr)
Japanese (ja)
Inventor
阿部一博
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2013018552A1 publication Critical patent/WO2013018552A1/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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/178—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for pouch or flexible bag 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/588—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries outside the batteries, e.g. incorrect connections of terminals or busbars
    • 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

Definitions

  • the present invention relates to a battery such as a lithium ion secondary battery, and more specifically, a battery element formed by laminating a positive electrode member and a negative electrode member via a separator is housed in an exterior body, and the positive electrode member
  • the present invention relates to a battery having a structure in which a positive electrode terminal that conducts and a negative electrode terminal that conducts electricity to a negative electrode member are drawn out of the exterior body.
  • secondary batteries represented by lithium ion secondary batteries have been widely used as power sources for portable electronic devices such as mobile phones and portable personal computers.
  • electric vehicles and hybrid vehicles have been developed and put into practical use, and the demand for secondary batteries such as lithium ion secondary batteries is increasing as large-scale applications.
  • a secondary battery (hereinafter, also simply referred to as “battery”), as shown in FIG. 9, a plurality of positive electrode members and negative electrode members are laminated via a separator (or flattened after winding).
  • the electrode group 102 thus formed is housed together with the electrolyte in the outer case 101 that seals the periphery of the laminated sheet that has been laminated, and the positive electrode terminal 103 that is connected to the positive electrode member, and the negative electrode that is connected to the negative electrode member
  • the terminal 104 has a structure drawn out from the outer case 101, and is arranged so as to surround the electrode group 102 as electrode group fixing means for preventing movement of the electrode group 102 in the outer case 101.
  • a battery including a protective frame 105 that is provided and housed in the outer case 101 together with the electrode group 102 (see Patent Document 1).
  • the protective frame 105 is provided so as to protrude outward from both side edges of one side of the frame portions 106 and 107 and the frame portions 106 and 107 attached to cover the peripheral edge of the electrode group 102 having a rectangular outer shape.
  • the configuration includes a joint 108 between the positive electrode terminal 103 and the positive electrode member, and a pair of protective pieces 110 and 111 covering the joint 109 between the negative electrode terminal 104 and the negative electrode member from both sides.
  • the protective frame is merely disposed so as to surround the electrode group, and means for particularly firmly bonding between the protective frame and the outer case (laminate film). Is not taken.
  • the internal electrode group is not fixed at a predetermined position of the device, so external stress such as vibration and impact is applied.
  • the positional relationship between the positive electrode terminal or the negative electrode terminal and the internal electrode group may fluctuate, and there may be a problem such as deformation or breakage in a connection portion between the positive and negative electrode terminals and the positive and negative electrode members.
  • the present invention solves the above-mentioned problem. Even when a large stress is applied to the positive electrode member and the negative electrode terminal that are electrically connected to the positive electrode member and the negative electrode member accommodated in the outer package made of a laminate sheet, for example, the positive and negative electrodes It is an object of the present invention to provide a highly reliable battery that does not cause a problem in a connection portion that connects a member and positive and negative terminals.
  • the battery of the present invention (Claim 1)
  • a battery element including a laminate and an electrolyte that are laminated so that a positive electrode member and a negative electrode member face each other with a separator interposed therebetween is housed in an exterior body made of a laminate sheet, and is electrically connected to the positive electrode member.
  • a terminal holding member having a positive terminal fixing portion to which the positive terminal is fixed and a negative terminal fixing portion to which the negative terminal is fixed is housed inside the exterior body, and the positive terminal fixing of the terminal holding member. The positive terminal is fixed to the part, and the negative terminal is fixed to the negative terminal fixing part.
  • the positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are connected to the positive electrode terminal and a part of the negative electrode terminal or screwed together. It is preferable to be fixed to the terminal and the negative terminal.
  • the exterior body is formed by arranging a laminate sheet having an adhesive layer made of a resin so that the adhesive layers face each other and joining peripheral edges.
  • the positive terminal fixing portion to which the positive terminal is fixed and the negative terminal fixing portion to which the negative terminal is fixed are held and fixed to the joint portion of the outer package. Is preferred.
  • the said terminal holding member is formed from the resin material.
  • the constituent material of the end holding member it is also possible to use a material that does not cause a short circuit between the positive electrode terminal and the negative electrode terminal, for example, a resin material coated on the surface of a metal material.
  • a terminal holding member including a positive electrode terminal fixing portion to which the positive electrode terminal is fixed and a negative electrode terminal fixing portion to which the negative electrode terminal is fixed is housed in the exterior body.
  • the positive terminal is fixed to the positive terminal fixing part of the terminal holding member, and the negative terminal is fixed to the negative terminal fixing part, so that the relative position between the positive terminal and the negative terminal is held constant.
  • the holding member takes over the stress, and the exterior body and the connection part between the battery element inside the positive electrode terminal and the negative electrode terminal (for example, a foil-shaped collector) It is possible to suppress or prevent stress from being applied to the electric body. As a result, a highly reliable battery can be obtained.
  • the positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed of the terminal holding member by engaging or screwing with a part of the positive electrode terminal and the negative electrode terminal By fixing to the positive electrode terminal and the negative electrode terminal, the terminal holding member and the positive electrode terminal and the negative electrode terminal are firmly fixed, and the relative positions of the positive electrode terminal and the negative electrode terminal are more reliably held constant, and further reliable. It becomes possible to obtain a high-performance battery.
  • the terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are held and fixed to the joint portion of the exterior body of the terminal holding member, the terminal is held. Since the member is more firmly integrated with the exterior body, a battery with higher reliability can be obtained.
  • fixed part of a terminal holding member can be more securely held and fixed to the joint portion of the exterior body, and the present invention can be further effectively realized.
  • FIG. 1 It is front sectional drawing which shows the battery concerning one Example (Example 1) of this invention. It is a top view of the battery of FIG. It is a figure which shows the terminal holding member used in the battery of FIG. 1, Comprising: (a) is a front view, (b) is a top view. (A) is a top view which shows the positive electrode terminal which comprises the battery of FIG. 1, (b) is a front view. (A) is a top view which shows the negative electrode terminal which comprises the battery of FIG. 1, (b) is a front view. It is a figure which shows the structure of the laminate sheet used for the exterior body of the battery concerning Example 1 of this invention. It is front sectional drawing which shows the battery concerning the other Example (Example 2) of this invention. (A) is an expanded view which shows the other example of the terminal holding member used for the battery of this invention, (b) is a side view which shows the terminal holding member after performing a bending process. It is a perspective view which shows the structure of the conventional battery.
  • FIG. 1 is a front sectional view showing a battery (lithium ion secondary battery) (unit battery) according to one embodiment (Example 1) of the present invention
  • FIG. 2 is a plan view.
  • the battery (lithium ion secondary battery) (unit battery) 1 of Example 1 includes a laminate 11a formed by laminating a positive electrode member and a negative electrode member so as to face each other via a separator, and an electrolyte (not shown). ) And the like, and a positive electrode terminal 12 and a negative electrode terminal electrically connected to a positive electrode member and a negative electrode member (not shown) of the battery element 11 via current collectors (current collector foils) 19, respectively.
  • 13 and the outer casing 10 having a substantially rectangular plane shape that accommodates the battery element 11, and the positive electrode terminal 12 and the negative electrode terminal 13 are drawn out from two opposite sides of the outer casing 10. Yes.
  • the battery 1 includes a terminal holding unit provided with a positive terminal fixing part 22 to which the positive terminal 12 is fixed and a negative terminal fixing part 23 to which the negative terminal 13 is fixed.
  • a member 24 is provided.
  • Example 1 a terminal holding member made of a plate material made of polypropylene and having a thickness of 1 mm is used as the terminal holding member 24. As shown in FIGS. 3A and 3B, the terminal holding member 24 has three protrusions 22 a as the positive terminal fixing part 22, and three protrusions as the negative terminal fixing part 23. 23a is formed.
  • the positive electrode terminal 12 is formed with three through holes 12 a that engage with the three protrusions 22 a of the positive electrode terminal fixing portion 22.
  • the terminal 13 is formed with three through holes 13 a that engage with the three protrusions 23 a of the negative terminal fixing portion 23.
  • the through hole 12a of the positive terminal 12 is engaged with the protrusion 22a of the positive terminal fixing part 22 of the terminal holding member 24, and the through hole 13a of the negative terminal 13 is engaged with the protrusion 23a of the negative terminal fixing part 23 of the terminal holding member 24. Is engaged, the positive electrode terminal 12, the negative electrode terminal 13, and the terminal holding member 24 are fixed, and the relative positions of the positive electrode terminal 12 and the negative electrode terminal 13 are held constant.
  • the outer package 10 includes an outer protective layer 15 made of a resin (polyamide resin in this embodiment 1) and an intermediate gas barrier layer 16 made of a metal (aluminum in this embodiment 1). And a pair of laminate sheets 14 (14a, 14b) formed by laminating and integrating an inner adhesive layer 17 made of a resin (polypropylene resin in this embodiment 1). That is, the exterior body 10 is arranged such that a pair of laminate sheets 14 (14a, 14b) are disposed so that the adhesive layers 17 face each other, and then the peripheral portions of the pair of laminate sheets 14 (14a, 14b) are thermally welded. And are joined together.
  • the bonding portion 18 in which the adhesive layers 17 of the laminate sheet 14 (14a, 14b) are heat-welded has strong adhesive strength, and is left for a long time (for example, 60 ° C. 90% RH, 3000 hours) under high temperature and high humidity. However, since the adhesive strength does not decrease, high bonding reliability can be obtained.
  • the laminate sheet 14 (14a, 14b) is not limited to the one having the above configuration, and the adhesive layer 17 may be, for example, a mixed material of polypropylene and polyethylene.
  • the positive terminal 12 and the negative terminal 13 are drawn out from the joint 18.
  • a sealant for example, polypropylene
  • the positive electrode terminal fixing portion 22 of the terminal holding member 24 to which the positive electrode terminal 12 is fixed is held and fixed to the joint portion 18 of the outer package 10 together with the positive electrode terminal 12.
  • the negative electrode terminal fixing portion 23 to which is fixed is held and fixed together with the negative electrode terminal 13 at the joint portion 18 of the outer package 10. Since the end holding member 24 is made of polypropylene resin, the end holding member 24 is firmly bonded to the adhesive layer 17 of the laminate sheet 14 and is securely bonded to the exterior body 10. However, in the present invention, the end holding member 24 is not directly held and fixed to the outer package 10, but is indirectly held and fixed to the outer package 10 via the positive electrode terminal 12 and the negative electrode terminal 13. It is also possible.
  • a laminate 11a formed by laminating a positive electrode member and a negative electrode member so as to face each other with a separator therebetween, and an electrolytic solution (not shown) are prepared.
  • a laminate sheet 14 (14a, 14b) is prepared for forming the outer package 10 that houses the battery element 11 including the laminate 11a and the electrolytic solution.
  • a terminal holding member 24 including a positive terminal fixing part 22 to which the positive terminal 12 is fixed and a negative terminal fixing part 23 to which the negative terminal 13 is fixed is prepared.
  • the laminate 11a, the positive electrode terminal 12, and the negative electrode terminal 13 are connected to the positive electrode so as to be positioned in the accommodation space formed by the pair of laminate sheets 14 (14a, 14b).
  • the terminal holding member 24 engaged with the terminal fixing portion 22 and the negative terminal fixing portion 23 is disposed at a predetermined position.
  • the peripheral portions (four sides) of the laminate sheet 14 (14a, 14b) are thermally welded leaving a part, and then an appropriate amount of the peripheral portion of the outer package 10 from the unwelded portion to the inside of the outer package 10.
  • the exterior body 10 is sealed by injecting an electrolytic solution and completely welding the peripheral edge of the exterior body 10 while vacuuming. Thereby, the battery 1 having a structure as shown in FIG. 1 is obtained.
  • the welded portion 18 of the laminate sheet 14 (14a, 14b) constituting the outer package 10 is provided.
  • the adhesive layer 17 of the laminate sheet 14 and the sealant are bonded to the positive electrode terminal 12 with a sealant (for example, a tape-like member made of polypropylene resin) interposed between the positive electrode terminal 12 and the negative electrode terminal 13. Further, as described above, it is also possible to constitute so as to be welded integrally with the negative electrode terminal 13.
  • the positive terminal 12 is fixed to the positive terminal fixing part 22 of the terminal holding member 24 accommodated in the exterior body 10, and the negative terminal 13 is fixed to the negative terminal fixing part 23.
  • the terminal holding member 24 takes over the stress.
  • it is possible to suppress and prevent the stress from being applied to the exterior body 10, the battery element 11 in the interior, and the connection portion (for example, the current collector (foil) 19) between the positive electrode terminal 12 and the negative electrode terminal 13. it can. As a result, a highly reliable battery can be obtained.
  • the stress applied to the positive electrode terminal and the negative electrode terminal is assumed by the exterior body, the electrode group (positive and negative electrode members) and the current collector (current collector foil) constituting the battery element.
  • the exterior body, the electrode group (positive and negative electrode members) and the current collector (current collector foil) constituting the battery element.
  • the electrode group (positive and negative electrode members) and the current collector constituting the battery element.
  • the exterior body, the electrode group (positive and negative electrode members), the current collector and the like resistant to stress deformation, but increase the thickness of the laminate sheet constituting the exterior body to improve the strength. In such a case, there is a problem that sealing of the exterior body becomes difficult or non-uniform.
  • the terminal holding member 24 is provided as in the present invention, even when stress is applied to the positive terminal 12 and / or the negative terminal 13, the stress is applied to the end holding member 24. It is possible to suppress and prevent the exterior body 10 and the current collector (foil) 19 from being damaged, which is meaningful. Further, in obtaining a battery having the configuration of the present invention, it is not necessary to change other components and the design is easy.
  • FIG. 7 is a front sectional view showing the structure of a battery according to another embodiment (Example 2) of the present invention.
  • the same two terminal holding members 24 as those used in the first embodiment are used. That is, in the battery of the second embodiment, the terminal holding members 24 are disposed on both the upper and lower sides of the battery element 11 so as to sandwich the battery element 11.
  • the terminal holding member 24 is configured so that the protrusions 22a and 23a functioning as the positive electrode terminal fixing portion 22 and the negative electrode terminal fixing portion 23 are engaged with the through hole 12a of the positive electrode terminal 12 and the through hole 13a of the negative electrode terminal 13.
  • the surfaces on which the protrusions 22a and 23a are formed are disposed so as to face each other.
  • a pair of terminal holding member 24 is comprised so that the through-hole 12a of the positive electrode terminal 12 and the through-hole 13a of the negative electrode terminal 13 may be engaged from the up-and-down both surfaces side in the state which the both ends side bent.
  • the pair of end holding members 24 can be formed in a curved shape as shown in FIG. In FIG. 7, the parts denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
  • the two terminal holding members 24 are arranged so as to sandwich the battery element 11, and the protrusions 22 a and 23 a functioning as the positive terminal fixing part 22 and the negative terminal fixing part 23 are Engaging with the through hole 12a of the positive terminal 12 and the through hole 13a of the negative terminal 13, the relative positions of the positive terminal 12 and the negative terminal 13 are held constant, and the battery element 11 also has two terminal holding members 24. And is securely held between them.
  • the effect that the displacement of the battery element 11 in the exterior body 10 can be more reliably prevented can be obtained.
  • a battery with higher reliability can be obtained.
  • FIG. 8A and 8B are diagrams showing a modification of the terminal holding member 24.
  • FIG. The terminal holding member 24 is formed into a box shape (that is, a thin cylindrical shape) having both ends opened by bending, and a region 24a in FIG. 24b becomes the other main surface portion (see FIG. 8B), and the band-like region 24c in the center in the vertical direction in FIG. 8A and the belt-like regions 24d and 24e on both ends in the vertical direction in FIG. Is a side wall (see FIG. 8B).
  • the specific configuration and details of the shape of the terminal holding member are not limited to the above-described embodiments and modifications, and various configurations such as a frame-shaped structure can be used. It is.
  • fixed part of a terminal holding member are protrusions, and it is comprised so that it may engage with the through-hole formed in the positive electrode terminal and the negative electrode terminal.
  • the positive electrode terminal fixing portion and the negative electrode terminal fixing portion of the terminal holding member are configured as through holes or bottomed holes, and protrusions are formed on the positive electrode terminal and the negative electrode terminal, and both are engaged and fixed. It is also possible to configure as described above.
  • the present invention is not limited to the above embodiment in other points as well, and relates to a specific shape of the terminal holding member and its constituent material, a specific configuration of the battery element, a specific shape of the exterior body, and the like. Various applications and modifications can be made within the scope of the invention.

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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)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Provided is a battery with high reliability in which malfunctions do not occur in, for example, connecting parts that connect a positive/negative electrode member to a positive/negative electrode terminal even when a large stress is applied to the positive electrode terminal and negative electrode terminal which connect to the positive electrode member and a negative electrode member accommodated inside an outer housing formed from a laminated sheet. A battery (1) has a structure in which a battery element (11) is accommodated inside an outer housing (10) formed from a laminated sheet (14 (14a, 14b)) and a positive electrode terminal (12) connected to the positive electrode member and a negative electrode terminal (13) connected to the negative electrode member, these electrode members constituting the battery element (11), are extracted to the outside of the outer housing. In the battery (1), a terminal holding member (24) provided with a positive electrode terminal fixing part (22) to which the positive electrode terminal is affixed and a negative electrode terminal fixing part (23) to which the negative electrode terminal is affixed is accommodated inside the outer housing (10), and the positive electrode terminal is affixed to the positive electrode terminal fixing part of the terminal holding member and the negative electrode terminal affixed to the negative electrode terminal fixing part to hold the relative positions of the positive electrode terminal and the negative electrode terminal constant.

Description

電池battery
　この発明は、例えば、リチウムイオン二次電池などの電池に関し、詳しくは、正極部材と負極部材とをセパレータを介して積層してなる電池要素が外装体の内部に収納され、かつ、正極部材と導通する正極端子および負極部材と導通する負極端子が、外装体の外部に引き出された構造を有する電池に関する。 The present invention relates to a battery such as a lithium ion secondary battery, and more specifically, a battery element formed by laminating a positive electrode member and a negative electrode member via a separator is housed in an exterior body, and the positive electrode member The present invention relates to a battery having a structure in which a positive electrode terminal that conducts and a negative electrode terminal that conducts electricity to a negative electrode member are drawn out of the exterior body.
　近年、携帯電話、携帯用パーソナルコンピュータなどの携帯用電子機器の電源としてリチウムイオン二次電池などに代表される二次電池が広く用いられるようになっている。また、電気自動車、ハイブリッド自動車の開発及び実用化がなされ、大型用途としてリチウムイオン二次電池などの二次電池への要求が高くなっている。 In recent years, secondary batteries represented by lithium ion secondary batteries have been widely used as power sources for portable electronic devices such as mobile phones and portable personal computers. In addition, electric vehicles and hybrid vehicles have been developed and put into practical use, and the demand for secondary batteries such as lithium ion secondary batteries is increasing as large-scale applications.
　ところで、このような二次電池（以下、単に「電池」ともいう）として、図９に示すように、セパレータを介して複数の正極部材と負極部材とが積層（または巻回後扁平に圧潰）されてなる電極群１０２が、２枚重ねとなったラミネートシートの周囲をシールした外装ケース１０１内に、電解液とともに収納され、正極部材と接続する正極端子１０３、および、負極部材と接続する負極端子１０４が、外装ケース１０１から外部に引き出された構造を有し、さらに電極群１０２の外装ケース１０１内における移動を阻止するための電極群固定手段として、電極群１０２の周囲を取り囲むように配設され、電極群１０２と共に外装ケース１０１内に収容される保護枠１０５を備えた電池が提案されている（特許文献１参照）。 By the way, as such a secondary battery (hereinafter, also simply referred to as “battery”), as shown in FIG. 9, a plurality of positive electrode members and negative electrode members are laminated via a separator (or flattened after winding). The electrode group 102 thus formed is housed together with the electrolyte in the outer case 101 that seals the periphery of the laminated sheet that has been laminated, and the positive electrode terminal 103 that is connected to the positive electrode member, and the negative electrode that is connected to the negative electrode member The terminal 104 has a structure drawn out from the outer case 101, and is arranged so as to surround the electrode group 102 as electrode group fixing means for preventing movement of the electrode group 102 in the outer case 101. There has been proposed a battery including a protective frame 105 that is provided and housed in the outer case 101 together with the electrode group 102 (see Patent Document 1).
　なお、保護枠１０５は、矩形状の外形を有する電極群１０２の周縁部を覆う状態に取り付けられた枠部１０６，１０７と、枠部１０６，１０７の一辺の両側縁からそれぞれ外方に突設されて正極端子１０３と正極部材との接合部１０８と、負極端子１０４と負極部材との接合部１０９を両側から覆う一対の保護片１１０，１１１とを備えた構成とされている。 The protective frame 105 is provided so as to protrude outward from both side edges of one side of the frame portions 106 and 107 and the frame portions 106 and 107 attached to cover the peripheral edge of the electrode group 102 having a rectangular outer shape. Thus, the configuration includes a joint 108 between the positive electrode terminal 103 and the positive electrode member, and a pair of protective pieces 110 and 111 covering the joint 109 between the negative electrode terminal 104 and the negative electrode member from both sides.
　ところで、上述のようなラミネート型の電池を使用する場合、一般的には、機器の所定の箇所に固定して使用されることになるが、その場合の固定方法としては、両面テープなどの接合部材を用いて接合固定する方法が挙げられる。 By the way, when using a laminate-type battery as described above, it is generally used by being fixed to a predetermined part of the device. In this case, as a fixing method, bonding such as double-sided tape is used. The method of joining and fixing using a member is mentioned.
　しかしながら、上記のように構成された電池の場合、保護枠は電極群を取り囲むように配置されているだけであり、また保護枠と外装ケース（ラミネートフィルム）間も特に強固に結合させるような手段は講じられていない。 However, in the case of the battery configured as described above, the protective frame is merely disposed so as to surround the electrode group, and means for particularly firmly bonding between the protective frame and the outer case (laminate film). Is not taken.
　そのため、両面テープなどの接合部材で電池の外装ケースと機器とを接合した場合、内部の電極群を上記機器の所定の位置に固定することにはならないため、振動や衝撃などの外部応力が加わると、正極端子や負極端子と内部の電極群との位置関係が変動して、正負極端子と正負極部材との接続部などに変形や破断などの不具合が発生するおそれがある。 For this reason, when the battery outer case and the device are joined with a joining member such as a double-sided tape, the internal electrode group is not fixed at a predetermined position of the device, so external stress such as vibration and impact is applied. In addition, the positional relationship between the positive electrode terminal or the negative electrode terminal and the internal electrode group may fluctuate, and there may be a problem such as deformation or breakage in a connection portion between the positive and negative electrode terminals and the positive and negative electrode members.
特許第３６０２７９７号公報Japanese Patent No. 3606027
　本発明は、上記課題を解決するものであり、ラミネートシートからなる外装体内に収容された正極部材および負極部材と導通する正極端子および負極端子に大きな応力が加わった場合にも、例えば、正負極部材と正負極端子とを接続する接続部などに不具合が生じることのない、信頼性の高い電池を提供することを目的とする。 The present invention solves the above-mentioned problem. Even when a large stress is applied to the positive electrode member and the negative electrode terminal that are electrically connected to the positive electrode member and the negative electrode member accommodated in the outer package made of a laminate sheet, for example, the positive and negative electrodes It is an object of the present invention to provide a highly reliable battery that does not cause a problem in a connection portion that connects a member and positive and negative terminals.
　上記課題を解決するために、本発明（請求項１）の電池は、
　正極部材と負極部材とがセパレータを介して互いに対向するように積層された積層体と電解質とを含む電池要素が、ラミネートシートからなる外装体の内部に収容され、かつ、前記正極部材と導通する正極端子と、前記負極部材と導通する負極端子とが、前記外装体の外部に引き出された構造を有する電池であって、
　前記正極端子が固定される正極端子固定部と、前記負極端子が固定される負極端子固定部とを備えた端子保持部材が前記外装体の内部に収容され、前記端子保持部材の前記正極端子固定部に前記正極端子が固定され、前記負極端子固定部に前記負極端子が固定されること
　を特徴としている。 In order to solve the above problems, the battery of the present invention (Claim 1)
A battery element including a laminate and an electrolyte that are laminated so that a positive electrode member and a negative electrode member face each other with a separator interposed therebetween is housed in an exterior body made of a laminate sheet, and is electrically connected to the positive electrode member. A battery having a structure in which a positive electrode terminal and a negative electrode terminal electrically connected to the negative electrode member are drawn out of the exterior body,
A terminal holding member having a positive terminal fixing portion to which the positive terminal is fixed and a negative terminal fixing portion to which the negative terminal is fixed is housed inside the exterior body, and the positive terminal fixing of the terminal holding member. The positive terminal is fixed to the part, and the negative terminal is fixed to the negative terminal fixing part.
　なお、前記端子保持部材の、正極端子が固定される正極端子固定部と、負極端子が固定される負極端子固定部は、正極端子および負極端子の一部との係合またはねじ止めにより、正極端子および負極端子に固定されることが好ましい。 The positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are connected to the positive electrode terminal and a part of the negative electrode terminal or screwed together. It is preferable to be fixed to the terminal and the negative terminal.
　また、本発明の電池において、前記外装体は、樹脂からなる接着層を備えたラミネートシートを、前記接着層どうしが対向するように配設し、周縁部を接合することにより形成されているとともに、前記端子保持部材の、前記正極端子が固定された前記正極端子固定部と、前記負極端子が固定された前記負極端子固定部とが、前記外装体の接合部に保持、固定されていることが好ましい。 Further, in the battery of the present invention, the exterior body is formed by arranging a laminate sheet having an adhesive layer made of a resin so that the adhesive layers face each other and joining peripheral edges. The positive terminal fixing portion to which the positive terminal is fixed and the negative terminal fixing portion to which the negative terminal is fixed are held and fixed to the joint portion of the outer package. Is preferred.
　また、前記端子保持部材は、樹脂材料から形成されたものであることが好ましい。
　ただし、端部保持部材の構成材料としては、正極端子と負極端子とを短絡させてしまうおそれのないもの、例えば、金属材料の表面に樹脂コーティングしたものなどを用いることも可能である。 Moreover, it is preferable that the said terminal holding member is formed from the resin material.
However, as the constituent material of the end holding member, it is also possible to use a material that does not cause a short circuit between the positive electrode terminal and the negative electrode terminal, for example, a resin material coated on the surface of a metal material.
　本発明（請求項１）の電池においては、正極端子が固定される正極端子固定部と、負極端子が固定される負極端子固定部とを備えた端子保持部材が、外装体の内部に収容され、端子保持部材の正極端子固定部に正極端子が固定され、負極端子固定部に負極端子が固定されることにより、正極端子と負極端子の相対位置が一定に保持されているため、正極端子および／または負極端子に応力が加わった場合にも、その応力を保持部材が引き受けることになり、外装体や、その内部の電池要素と正極端子および負極端子との接続部（例えば、箔状の集電体）などに応力が加わることを抑制、防止することができる。その結果、信頼性の高い電池を得ることが可能になる。 In the battery of the present invention (invention 1), a terminal holding member including a positive electrode terminal fixing portion to which the positive electrode terminal is fixed and a negative electrode terminal fixing portion to which the negative electrode terminal is fixed is housed in the exterior body. The positive terminal is fixed to the positive terminal fixing part of the terminal holding member, and the negative terminal is fixed to the negative terminal fixing part, so that the relative position between the positive terminal and the negative terminal is held constant. Even when stress is applied to the negative electrode terminal, the holding member takes over the stress, and the exterior body and the connection part between the battery element inside the positive electrode terminal and the negative electrode terminal (for example, a foil-shaped collector) It is possible to suppress or prevent stress from being applied to the electric body. As a result, a highly reliable battery can be obtained.
　また、前記端子保持部材の、正極端子が固定される正極端子固定部と、負極端子が固定される負極端子固定部とを、正極端子および負極端子の一部との係合またはねじ止めにより、正極端子および負極端子に固定することにより、端子保持部材と正極端子および負極端子とが強固に固定されることになり、正極端子と負極端子の相対位置がより確実に一定に保持され、さらに信頼性の高い電池を得ることが可能になる。 Further, the positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed of the terminal holding member by engaging or screwing with a part of the positive electrode terminal and the negative electrode terminal, By fixing to the positive electrode terminal and the negative electrode terminal, the terminal holding member and the positive electrode terminal and the negative electrode terminal are firmly fixed, and the relative positions of the positive electrode terminal and the negative electrode terminal are more reliably held constant, and further reliable. It becomes possible to obtain a high-performance battery.
　また、端子保持部材の、正極端子が固定された正極端子固定部と、負極端子が固定された負極端子固定部とを、外装体の接合部に保持、固定されるようにした場合、端子保持部材が外装体とより強固に一体化するため、さらに信頼性の高い電池を得ることが可能になる。 In addition, when the positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are held and fixed to the joint portion of the exterior body of the terminal holding member, the terminal is held. Since the member is more firmly integrated with the exterior body, a battery with higher reliability can be obtained.
　また、端子保持部材として、樹脂材料から形成されたものを用いることにより、ラミネートシートの接着層と強固に接着させることが可能になるため、端子保持部材の正極端子固定部と負極端子固定部とをより確実に外装体の接合部に保持、固定させることが可能になり、本発明をさらに実効あらしめることができる。 Moreover, since it becomes possible to make it adhere | attach firmly with the adhesive layer of a laminate sheet by using what was formed from the resin material as a terminal holding member, the positive electrode terminal fixing | fixed part and negative electrode terminal fixing | fixed part of a terminal holding member Can be more securely held and fixed to the joint portion of the exterior body, and the present invention can be further effectively realized.
本発明の一実施例（実施例１）にかかる電池を示す正面断面図である。It is front sectional drawing which shows the battery concerning one Example (Example 1) of this invention. 図１の電池の平面図である。It is a top view of the battery of FIG. 図１の電池において用いられている端子保持部材を示す図であって、（ａ）は正面図、（ｂ）は平面図である。It is a figure which shows the terminal holding member used in the battery of FIG. 1, Comprising: (a) is a front view, (b) is a top view. （ａ）は図１の電池を構成する正極端子を示す平面図、（ｂ）は正面図である。(A) is a top view which shows the positive electrode terminal which comprises the battery of FIG. 1, (b) is a front view. （ａ）は図１の電池を構成する負極端子を示す平面図、（ｂ）は正面図である。(A) is a top view which shows the negative electrode terminal which comprises the battery of FIG. 1, (b) is a front view. 本発明の実施例１にかかる電池の外装体に用いられているラミネートシートの構成を示す図である。It is a figure which shows the structure of the laminate sheet used for the exterior body of the battery concerning Example 1 of this invention. 本発明の他の実施例（実施例２）にかかる電池を示す正面断面図である。It is front sectional drawing which shows the battery concerning the other Example (Example 2) of this invention. （ａ）は、本発明の電池に用いられる端子保持部材の他の例を示す展開図、（ｂ）は折り曲げ加工を行った後の端子保持部材を示す側面図である。(A) is an expanded view which shows the other example of the terminal holding member used for the battery of this invention, (b) is a side view which shows the terminal holding member after performing a bending process. 従来の電池の構成を示す斜視図である。It is a perspective view which shows the structure of the conventional battery.
　以下に本発明の実施例を示して、本発明の特徴とするところをさらに詳しく説明する。 Hereinafter, the features of the present invention will be described in more detail with reference to examples of the present invention.
　図１は本発明の一実施例（実施例１）にかかる電池（リチウムイオン二次電池）（単位電池）を示す正面断面図、図２は平面図である。 FIG. 1 is a front sectional view showing a battery (lithium ion secondary battery) (unit battery) according to one embodiment (Example 1) of the present invention, and FIG. 2 is a plan view.
　この実施例１の電池（リチウムイオン二次電池）（単位電池）１は、正極部材と負極部材とをセパレータを介して互いに対向するように積層してなる積層体１１ａや電解液（図示せず）などを含む電池要素１１と、電池要素１１の正極部材および負極部材（図示せず）のそれぞれに集電体（集電箔）１９を介して電気的に接続された正極端子１２および負極端子１３と、上記電池要素１１を収容する、平面形状が略長方形の外装体１０とを備えており、正極端子１２および負極端子１３は外装体１０の互いに対向する２つの辺から外部に引き出されている。 The battery (lithium ion secondary battery) (unit battery) 1 of Example 1 includes a laminate 11a formed by laminating a positive electrode member and a negative electrode member so as to face each other via a separator, and an electrolyte (not shown). ) And the like, and a positive electrode terminal 12 and a negative electrode terminal electrically connected to a positive electrode member and a negative electrode member (not shown) of the battery element 11 via current collectors (current collector foils) 19, respectively. 13 and the outer casing 10 having a substantially rectangular plane shape that accommodates the battery element 11, and the positive electrode terminal 12 and the negative electrode terminal 13 are drawn out from two opposite sides of the outer casing 10. Yes.
　また、この実施例１の電池１は、外装体１０の内部に、正極端子１２が固定される正極端子固定部２２と、負極端子１３が固定される負極端子固定部２３とを備えた端子保持部材２４を備えている。 In addition, the battery 1 according to the first embodiment includes a terminal holding unit provided with a positive terminal fixing part 22 to which the positive terminal 12 is fixed and a negative terminal fixing part 23 to which the negative terminal 13 is fixed. A member 24 is provided.
　この実施例１では、端子保持部材２４として、ポリプロピレン製で、厚みが１　ｍｍの板状材料からなる端子保持部材が用いられている。
　そして、端子保持部材２４には、図３（ａ），（ｂ）に示すように、正極端子固定部２２として３つの突起２２ａが形成されており、また、負極端子固定部２３として３つの突起２３ａが形成されている。 In Example 1, a terminal holding member made of a plate material made of polypropylene and having a thickness of 1 mm is used as the terminal holding member 24.
As shown in FIGS. 3A and 3B, the terminal holding member 24 has three protrusions 22 a as the positive terminal fixing part 22, and three protrusions as the negative terminal fixing part 23. 23a is formed.
　また、正極端子１２には、図４（ａ），（ｂ）に示すように、正極端子固定部２２の３つの突起２２ａと係合する３つの貫通孔１２ａが形成されており、また、負極端子１３には、図５（ａ），（ｂ）に示すように、負極端子固定部２３の３つの突起２３ａに係合する３つの貫通孔１３ａが形成されている。 Further, as shown in FIGS. 4A and 4B, the positive electrode terminal 12 is formed with three through holes 12 a that engage with the three protrusions 22 a of the positive electrode terminal fixing portion 22. As shown in FIGS. 5A and 5B, the terminal 13 is formed with three through holes 13 a that engage with the three protrusions 23 a of the negative terminal fixing portion 23.
　そして、端子保持部材２４の正極端子固定部２２の突起２２ａに、正極端子１２の貫通孔１２ａが係合し、端子保持部材２４の負極端子固定部２３の突起２３ａに負極端子１３の貫通孔１３ａが係合することにより、正極端子１２、負極端子１３と、端子保持部材２４が固定され、正極端子１２と負極端子１３の相対位置が一定に保持されている。 The through hole 12a of the positive terminal 12 is engaged with the protrusion 22a of the positive terminal fixing part 22 of the terminal holding member 24, and the through hole 13a of the negative terminal 13 is engaged with the protrusion 23a of the negative terminal fixing part 23 of the terminal holding member 24. Is engaged, the positive electrode terminal 12, the negative electrode terminal 13, and the terminal holding member 24 are fixed, and the relative positions of the positive electrode terminal 12 and the negative electrode terminal 13 are held constant.
　また、外装体１０は、図６に示すように、樹脂（この実施例１ではポリアミド系樹脂）からなる外側の保護層１５と、金属（この実施例１ではアルミニウム）からなる中間のガスバリア層１６と、樹脂（この実施例１ではポリプロピレン樹脂）からなる内側の接着層１７とを積層して一体化した一対のラミネートシート１４（１４ａ，１４ｂ）を用いて形成されている。すなわち、外装体１０は、一対のラミネートシート１４（１４ａ，１４ｂ）を、接着層１７どうしが互いに対向するように配設した後、一対のラミネートシート１４（１４ａ，１４ｂ）の周縁部を熱溶着させて接合することにより形成されている。 Further, as shown in FIG. 6, the outer package 10 includes an outer protective layer 15 made of a resin (polyamide resin in this embodiment 1) and an intermediate gas barrier layer 16 made of a metal (aluminum in this embodiment 1). And a pair of laminate sheets 14 (14a, 14b) formed by laminating and integrating an inner adhesive layer 17 made of a resin (polypropylene resin in this embodiment 1). That is, the exterior body 10 is arranged such that a pair of laminate sheets 14 (14a, 14b) are disposed so that the adhesive layers 17 face each other, and then the peripheral portions of the pair of laminate sheets 14 (14a, 14b) are thermally welded. And are joined together.
　ラミネートシート１４（１４ａ，１４ｂ）の接着層１７どうしが熱溶着した接合部１８（図１）の接着強度は強固で、高温高湿下で長期間（例えば６０℃９０％ＲＨ、３０００時間）放置しても接着強度は低下しないことから、高い接合信頼性が得られる。 The bonding portion 18 (FIG. 1) in which the adhesive layers 17 of the laminate sheet 14 (14a, 14b) are heat-welded has strong adhesive strength, and is left for a long time (for example, 60 ° C. 90% RH, 3000 hours) under high temperature and high humidity. However, since the adhesive strength does not decrease, high bonding reliability can be obtained.
　なお、ラミネートシート１４（１４ａ，１４ｂ）は、上記構成のものに限られるものではなく、接着層１７は、例えば、ポリプロピレンとポリエチレンの混合材料であってもよい。 The laminate sheet 14 (14a, 14b) is not limited to the one having the above configuration, and the adhesive layer 17 may be, for example, a mixed material of polypropylene and polyethylene.
　そして、この実施例１の電池１では、正極端子１２および負極端子１３が接合部１８から引き出されている。なお、正極端子１２および負極端子１３の引き出し部においては、外装体１０を構成するラミネートシート１４（１４Ａ，１４ｂ）の接着層１７と、正極端子１２および負極端子１３との間にシーラント（例えばポリプロピレン樹脂からなるテープ状部材）を介してラミネートシートを熱溶着することにより、引き出し部の封止信頼性を向上させることができる。 In the battery 1 of Example 1, the positive terminal 12 and the negative terminal 13 are drawn out from the joint 18. In the lead-out portion of the positive electrode terminal 12 and the negative electrode terminal 13, a sealant (for example, polypropylene) is provided between the adhesive layer 17 of the laminate sheet 14 (14A, 14b) constituting the outer package 10 and the positive electrode terminal 12 and the negative electrode terminal 13. By thermally welding the laminate sheet via a tape-like member made of resin, the sealing reliability of the drawer portion can be improved.
　また、この実施例１の電池においては、端子保持部材２４の、正極端子１２が固定された正極端子固定部２２が正極端子１２とともに外装体１０の接合部１８に保持、固定され、負極端子１３が固定された負極端子固定部２３が負極端子１３とともに外装体１０の接合部１８に保持、固定されている。端部保持部材２４は、ポリプロピレン樹脂から形成されていることから、ラミネートシート１４の接着層１７と強固に接着して、外装体１０に確実に接合されている。
　ただし、本発明においては、端部保持部材２４が、直接に外装体１０に保持固定されておらず、正極端子１２，負極端子１３を介して間接的に外装体１０に保持、固定された構成とすることも可能である。 Further, in the battery of Example 1, the positive electrode terminal fixing portion 22 of the terminal holding member 24 to which the positive electrode terminal 12 is fixed is held and fixed to the joint portion 18 of the outer package 10 together with the positive electrode terminal 12. The negative electrode terminal fixing portion 23 to which is fixed is held and fixed together with the negative electrode terminal 13 at the joint portion 18 of the outer package 10. Since the end holding member 24 is made of polypropylene resin, the end holding member 24 is firmly bonded to the adhesive layer 17 of the laminate sheet 14 and is securely bonded to the exterior body 10.
However, in the present invention, the end holding member 24 is not directly held and fixed to the outer package 10, but is indirectly held and fixed to the outer package 10 via the positive electrode terminal 12 and the negative electrode terminal 13. It is also possible.
　この実施例１の電池１を製造するにあたっては、まず、正極部材と負極部材とをセパレータを介して互いに対向するように積層してなる積層体１１ａと、電解液（図示せず）とを用意するとともに、積層体１１ａと電解液を備えてなる電池要素１１を収容する外装体１０を形成するためのラミネートシート１４（１４ａ，１４ｂ）を用意する。 In manufacturing the battery 1 of Example 1, first, a laminate 11a formed by laminating a positive electrode member and a negative electrode member so as to face each other with a separator therebetween, and an electrolytic solution (not shown) are prepared. At the same time, a laminate sheet 14 (14a, 14b) is prepared for forming the outer package 10 that houses the battery element 11 including the laminate 11a and the electrolytic solution.
　さらに、正極端子１２が固定される正極端子固定部２２と、負極端子１３が固定される負極端子固定部２３とを備えた端子保持部材２４を用意する。 Further, a terminal holding member 24 including a positive terminal fixing part 22 to which the positive terminal 12 is fixed and a negative terminal fixing part 23 to which the negative terminal 13 is fixed is prepared.
　次に、図１に示すように、一対のラミネートシート１４（１４ａ，１４ｂ）により形成される収容空間に位置することになるように、積層体１１ａと、正極端子１２および負極端子１３をその正極端子固定部２２および負極端子固定部２３に係合させた状態の端子保持部材２４とを所定の位置に配置する。 Next, as shown in FIG. 1, the laminate 11a, the positive electrode terminal 12, and the negative electrode terminal 13 are connected to the positive electrode so as to be positioned in the accommodation space formed by the pair of laminate sheets 14 (14a, 14b). The terminal holding member 24 engaged with the terminal fixing portion 22 and the negative terminal fixing portion 23 is disposed at a predetermined position.
　それから、ラミネートシート１４（１４ａ，１４ｂ）の周縁部（４辺）を，一部を残して熱溶着した後、外装体１０の周縁部の溶着されていない部分から外装体１０の内部に適量の電解液を注入し，真空吸引しながら外装体１０の周縁部を完全に溶着させて、外装体１０を密封する。これにより、図１に示すような構造を有する電池１が得られる。 Then, the peripheral portions (four sides) of the laminate sheet 14 (14a, 14b) are thermally welded leaving a part, and then an appropriate amount of the peripheral portion of the outer package 10 from the unwelded portion to the inside of the outer package 10. The exterior body 10 is sealed by injecting an electrolytic solution and completely welding the peripheral edge of the exterior body 10 while vacuuming. Thereby, the battery 1 having a structure as shown in FIG. 1 is obtained.
　なお、本発明の電池１においては、正極端子１２および負極端子１３が導出されている部分の密封性を向上させるために，外装体１０を構成するラミネートシート１４（１４ａ，１４ｂ）の溶着部１８を構成する部分と、正極端子１２および負極端子１３の間に、シーラント（例えばポリプロピレン樹脂からなるテープ状部材）を介在させた状態で、ラミネートシート１４の接着層１７とシーラントとを、正極端子１２および負極端子１３と一体に溶着するように構成することも可能であることは上述した通りである。 In the battery 1 of the present invention, in order to improve the sealing performance of the portion from which the positive electrode terminal 12 and the negative electrode terminal 13 are led out, the welded portion 18 of the laminate sheet 14 (14a, 14b) constituting the outer package 10 is provided. The adhesive layer 17 of the laminate sheet 14 and the sealant are bonded to the positive electrode terminal 12 with a sealant (for example, a tape-like member made of polypropylene resin) interposed between the positive electrode terminal 12 and the negative electrode terminal 13. Further, as described above, it is also possible to constitute so as to be welded integrally with the negative electrode terminal 13.
　この実施例１の電池１の場合、外装体１０の内部に収容された端子保持部材２４の正極端子固定部２２に正極端子１２が固定され、負極端子固定部２３に負極端子１３が固定されており、正極端子１２と負極端子１３の相対位置が一定に保持されているため、正極端子１２および／または負極端子１３に応力が加わった場合にも、その応力を端子保持部材２４が引き受けることになり、外装体１０や、その内部の電池要素１１と、正極端子１２および負極端子１３との接続部（例えば、集電体（箔）１９）などに応力が加わることを抑制、防止することができる。その結果、信頼性の高い電池を得ることが可能になる。 In the case of the battery 1 of Example 1, the positive terminal 12 is fixed to the positive terminal fixing part 22 of the terminal holding member 24 accommodated in the exterior body 10, and the negative terminal 13 is fixed to the negative terminal fixing part 23. In addition, since the relative position between the positive electrode terminal 12 and the negative electrode terminal 13 is held constant, even when stress is applied to the positive electrode terminal 12 and / or the negative electrode terminal 13, the terminal holding member 24 takes over the stress. Thus, it is possible to suppress and prevent the stress from being applied to the exterior body 10, the battery element 11 in the interior, and the connection portion (for example, the current collector (foil) 19) between the positive electrode terminal 12 and the negative electrode terminal 13. it can. As a result, a highly reliable battery can be obtained.
　すなわち、端子保持部材を備えていない場合、正極端子や負極端子に印加される応力は、外装体や、電池要素を構成する電極群（正負極部材）や集電体（集電箔）が引き受けることになり、外装体の破損、電極群（正負極部材）や集電体の変形や破断など、電池特性に重大な影響を与える現象を引き起こすおそれがある。これに対し、外装体や電極群（正負極部材）、集電体などを応力変形に強いものにすることも考えられるが、外装体を構成するラミネートシートの厚みを厚くして強度を向上させるようにした場合、外装体のシールが困難になったり、不均一になったりするという問題点がある。 That is, when the terminal holding member is not provided, the stress applied to the positive electrode terminal and the negative electrode terminal is assumed by the exterior body, the electrode group (positive and negative electrode members) and the current collector (current collector foil) constituting the battery element. As a result, there is a risk of causing a phenomenon that has a significant effect on the battery characteristics, such as breakage of the exterior body, deformation or breakage of the electrode group (positive and negative electrode members) or current collector. On the other hand, it is conceivable to make the exterior body, the electrode group (positive and negative electrode members), the current collector and the like resistant to stress deformation, but increase the thickness of the laminate sheet constituting the exterior body to improve the strength. In such a case, there is a problem that sealing of the exterior body becomes difficult or non-uniform.
　また、集電体の厚みを厚くするにも、他の特性とトレードオフの関係にならざるを得ない事項も多く、実施が難しいのが実情である。 Also, in order to increase the thickness of the current collector, there are many matters that must be in a trade-off relationship with other characteristics, which is difficult to implement.
　このような状況下において、本発明のように端子保持部材２４を備えた構成とした場合、正極端子１２および／または負極端子１３に応力が加わった場合にも、その応力を端部保持部材２４が引き受けて、外装体１０や集電体（箔）１９などが破損したりすることを抑制、防止することが可能になり、有意義である。
　また、本発明の構成を備えた電池を得るにあたっては、他の構成部材を変更する必要がなく、設計も容易である。 Under such circumstances, when the terminal holding member 24 is provided as in the present invention, even when stress is applied to the positive terminal 12 and / or the negative terminal 13, the stress is applied to the end holding member 24. It is possible to suppress and prevent the exterior body 10 and the current collector (foil) 19 from being damaged, which is meaningful.
Further, in obtaining a battery having the configuration of the present invention, it is not necessary to change other components and the design is easy.
　図７は、本発明の他の実施例（実施例２）にかかる電池の構成を示す正面断面図である。
　この実施例２の電池１においては、実施例１で用いたものと同じ端子保持部材２４が２枚用いられている。
　すなわち、この実施例２の電池においては、電池要素１１を挟み込むように，電池要素１１の、上下両側に端子保持部材２４が配設されている。ただし、端子保持部材２４は、正極端子固定部２２および負極端子固定部２３として機能する突起２２ａおよび２３ａが、正極端子１２の貫通孔１２ａおよび負極端子１３の貫通孔１３ａに係合するように、突起２２ａ，２３ａが形成された面が互いに対向するように配設されている。 FIG. 7 is a front sectional view showing the structure of a battery according to another embodiment (Example 2) of the present invention.
In the battery 1 of the second embodiment, the same two terminal holding members 24 as those used in the first embodiment are used.
That is, in the battery of the second embodiment, the terminal holding members 24 are disposed on both the upper and lower sides of the battery element 11 so as to sandwich the battery element 11. However, the terminal holding member 24 is configured so that the protrusions 22a and 23a functioning as the positive electrode terminal fixing portion 22 and the negative electrode terminal fixing portion 23 are engaged with the through hole 12a of the positive electrode terminal 12 and the through hole 13a of the negative electrode terminal 13. The surfaces on which the protrusions 22a and 23a are formed are disposed so as to face each other.
　そして、一対の端子保持部材２４はその両端側が撓んだ状態で、上下両面側から、正極端子１２の貫通孔１２ａと、負極端子１３の貫通孔１３ａに係合するように構成されている。ただし、一対の端部保持部材２４を予め図７に示すような、湾曲した形状にしておくことも可能であることはいうまでもない。
　なお、図７において、図１と同じ符号を付した部分は、同一または相当する部分を示している。 And a pair of terminal holding member 24 is comprised so that the through-hole 12a of the positive electrode terminal 12 and the through-hole 13a of the negative electrode terminal 13 may be engaged from the up-and-down both surfaces side in the state which the both ends side bent. However, it goes without saying that the pair of end holding members 24 can be formed in a curved shape as shown in FIG.
In FIG. 7, the parts denoted by the same reference numerals as those in FIG. 1 indicate the same or corresponding parts.
　この実施例２の電池１においては、２枚の端子保持部材２４が電池要素１１を挟み込むように配設されて、正極端子固定部２２および負極端子固定部２３として機能する突起２２ａ，２３ａが、正極端子１２の貫通孔１２ａ、負極端子１３の貫通孔１３ａと係合して、正極端子１２と負極端子１３の相対位置が一定に保持されるとともに、電池要素１１も２枚の端子保持部材２４により挟まれて、その間に確実に保持される。
　その結果、上記実施例１の場合に得られる効果に加えて、外装体１０の内部で電池要素１１に位置ずれを生じることをさらに確実に防止できるという効果を得ることができる。その結果、さらに信頼性の高い電池を得ることができる。 In the battery 1 of Example 2, the two terminal holding members 24 are arranged so as to sandwich the battery element 11, and the protrusions 22 a and 23 a functioning as the positive terminal fixing part 22 and the negative terminal fixing part 23 are Engaging with the through hole 12a of the positive terminal 12 and the through hole 13a of the negative terminal 13, the relative positions of the positive terminal 12 and the negative terminal 13 are held constant, and the battery element 11 also has two terminal holding members 24. And is securely held between them.
As a result, in addition to the effect obtained in the case of Example 1, the effect that the displacement of the battery element 11 in the exterior body 10 can be more reliably prevented can be obtained. As a result, a battery with higher reliability can be obtained.
＜変形例＞
　また、図８（ａ），（ｂ）は、端子保持部材２４の変形例を示す図である。この端子保持部材２４は，折り曲げ加工することにより，両端部が開口した箱状（すなわち、薄い筒状）になるように構成されており、図８（ａ）の領域２４ａが一方主面部、領域２４ｂが他方主面部となり（図８（ｂ）参照）、図８（ａ）の上下方向の中央の帯状の領域２４ｃと、図８（ａ）の上下方向の両端側の帯状の領域２４ｄ，２４ｅが側壁部（図８（ｂ）参照）となるように構成されている。 <Modification>
8A and 8B are diagrams showing a modification of the terminal holding member 24. FIG. The terminal holding member 24 is formed into a box shape (that is, a thin cylindrical shape) having both ends opened by bending, and a region 24a in FIG. 24b becomes the other main surface portion (see FIG. 8B), and the band-like region 24c in the center in the vertical direction in FIG. 8A and the belt- like regions 24d and 24e on both ends in the vertical direction in FIG. Is a side wall (see FIG. 8B).
　また、主面部を構成する領域２４ａ，２４ｂの両端には、正極端子１２の貫通孔１２ａおよび負極端子１３の貫通孔１３ａと係合して（正負極端子については図４，図５参照）、正極端子固定部２２および負極端子固定部２３として機能する突起２２ａ，２３ａが形成されている。
　この端子保持部材２４を用いた場合にも、上記実施例１および２の電池の場合と同様の効果を得ることができる。 Further, at both ends of the regions 24a and 24b constituting the main surface portion, the through hole 12a of the positive electrode terminal 12 and the through hole 13a of the negative electrode terminal 13 are engaged (refer to FIG. 4 and FIG. 5 for the positive and negative electrode terminals), Projections 22 a and 23 a functioning as the positive terminal fixing part 22 and the negative terminal fixing part 23 are formed.
Even when this terminal holding member 24 is used, the same effect as in the case of the batteries of Examples 1 and 2 can be obtained.
　なお、端子保持部材の具体的な構成や細部の形状などは，上記実施例や変形例に限定されるものではなく、例えば、枠状構造のものなど、種々の構成のものを用いることが可能である。 Note that the specific configuration and details of the shape of the terminal holding member are not limited to the above-described embodiments and modifications, and various configurations such as a frame-shaped structure can be used. It is.
　また、上記実施例では，端子保持部材の正極端子固定部および負極端子固定部が突起であって、正極端子および負極端子に形成された貫通孔と係合するように構成されている場合を例にとって説明したが、端子保持部材の正極端子固定部および負極端子固定部を貫通孔や有底穴として構成するとともに、正極端子および負極端子に突起を形成して、両者を係合させて固定するように構成することも可能である。 Moreover, in the said Example, the case where the positive electrode terminal fixing | fixed part and negative electrode terminal fixing | fixed part of a terminal holding member are protrusions, and it is comprised so that it may engage with the through-hole formed in the positive electrode terminal and the negative electrode terminal is an example. As described above, the positive electrode terminal fixing portion and the negative electrode terminal fixing portion of the terminal holding member are configured as through holes or bottomed holes, and protrusions are formed on the positive electrode terminal and the negative electrode terminal, and both are engaged and fixed. It is also possible to configure as described above.
　本発明は、その他の点においても上記実施例に限定されるものではなく、端子保持部材の具体的な形状やその構成材料、電池要素の具体的な構成、外装体の具体的な形状などに関し、発明の範囲内において、種々の応用、変形を加えることが可能である。 The present invention is not limited to the above embodiment in other points as well, and relates to a specific shape of the terminal holding member and its constituent material, a specific configuration of the battery element, a specific shape of the exterior body, and the like. Various applications and modifications can be made within the scope of the invention.
　１　　　　　　　　　電池
　１０　　　　　　　　外装体
　１１　　　　　　　　電池要素
　１１ａ　　　　　　　積層体
　１２　　　　　　　　正極端子
　１２ａ　　　　　　　正極端子に形成された貫通孔
　１３　　　　　　　　負極端子
　１３ａ　　　　　　　負極端子に形成された貫通孔
　１４（１４ａ，１４ｂ）　　ラミネートシート
　１５　　　　　　　　保護層
　１６　　　　　　　　ガスバリア層
　１７　　　　　　　　接着層
　１８　　　　　　　　接合部
　１９　　　　　　　　集電体（集電箔）
　２２　　　　　　　　正極端子固定部
　２３　　　　　　　　負極端子固定部
　２４　　　　　　　　端子保持部材
　２２ａ，２３ａ　　　突起
　２４ａ，２４ｂ　　　主面部を構成する領域
　２４ｃ　　　　　　　中央の帯状の領域
　２４ｄ，２４ｅ　　　両端側の帯状の領域 DESCRIPTION OF SYMBOLS 1 Battery 10 Exterior body 11 Battery element 11a Laminated body 12 Positive electrode terminal 12a Through hole formed in the positive electrode terminal 13 Negative electrode terminal 13a Through hole 14 (14a, 14b) formed in the negative electrode terminal Laminate sheet 15 Protective layer 16 Gas barrier layer 17 Adhesive layer 18 Joint 19 Current collector (current collector foil)
22 Positive terminal fixing part 23 Negative terminal fixing part 24 Terminal holding member 22a, 23a Projection 24a, 24b Area constituting main surface part 24c Central band- like area 24d, 24e Band-like area on both ends

Claims (4)

  1. 　正極部材と負極部材とがセパレータを介して互いに対向するように積層された積層体と電解質とを含む電池要素が、ラミネートシートからなる外装体の内部に収容され、かつ、前記正極部材と導通する正極端子と、前記負極部材と導通する負極端子とが、前記外装体の外部に引き出された構造を有する電池であって、
    　前記正極端子が固定される正極端子固定部と、前記負極端子が固定される負極端子固定部とを備えた端子保持部材が前記外装体の内部に収容され、前記端子保持部材の前記正極端子固定部に前記正極端子が固定され、前記負極端子固定部に前記負極端子が固定されること
    　を特徴とする電池。     A battery element including a laminate and an electrolyte laminated such that a positive electrode member and a negative electrode member face each other with a separator interposed therebetween is housed in an exterior body made of a laminate sheet and is electrically connected to the positive electrode member. A battery having a structure in which a positive electrode terminal and a negative electrode terminal electrically connected to the negative electrode member are drawn out of the exterior body,
    A terminal holding member having a positive terminal fixing portion to which the positive terminal is fixed and a negative terminal fixing portion to which the negative terminal is fixed is housed inside the exterior body, and the positive terminal fixing of the terminal holding member. The battery is characterized in that the positive terminal is fixed to a part and the negative terminal is fixed to the negative terminal fixing part.
  2. 前記端子保持部材の、正極端子が固定される正極端子固定部と、負極端子が固定される負極端子固定部は、正極端子および負極端子の一部との係合またはねじ止めにより、正極端子および負極端子に固定されることを特徴とする請求項１記載の電池。 The positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are engaged with or screwed to the positive electrode terminal and a part of the negative electrode terminal of the terminal holding member. The battery according to claim 1, wherein the battery is fixed to a negative electrode terminal.
  3. 　前記外装体は、樹脂からなる接着層を備えたラミネートシートを、前記接着層どうしが対向するように配設し、周縁部を接合することにより形成されているとともに、前記端子保持部材の、前記正極端子が固定された前記正極端子固定部と、前記負極端子が固定された前記負極端子固定部とが、前記外装体の接合部に保持、固定されていることを特徴とする請求項１または２記載の電池。 The exterior body is formed by disposing a laminate sheet having an adhesive layer made of a resin so that the adhesive layers face each other and joining peripheral edges, and the terminal holding member, The positive electrode terminal fixing portion to which the positive electrode terminal is fixed and the negative electrode terminal fixing portion to which the negative electrode terminal is fixed are held and fixed to a joint portion of the exterior body. 2. The battery according to 2.
  4. 　前記端子保持部材は、樹脂材料から形成されたものであることを特徴とする請求項１～３のいずれかに記載の電池。 The battery according to any one of claims 1 to 3, wherein the terminal holding member is made of a resin material.
PCT/JP2012/068318 2011-08-01 2012-07-19 Battery WO2013018552A1 (en)

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EP3731295A1 (en) * 2019-04-26 2020-10-28 Toyota Jidosha Kabushiki Kaisha Secondary battery
CN111864175A (en) * 2019-04-26 2020-10-30 丰田自动车株式会社 Secondary battery
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JP2020184518A (en) * 2019-04-26 2020-11-12 トヨタ自動車株式会社 Secondary battery
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