WO2013018551A1 - Battery - Google Patents

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Publication number
WO2013018551A1
WO2013018551A1 PCT/JP2012/068311 JP2012068311W WO2013018551A1 WO 2013018551 A1 WO2013018551 A1 WO 2013018551A1 JP 2012068311 W JP2012068311 W JP 2012068311W WO 2013018551 A1 WO2013018551 A1 WO 2013018551A1
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WO
WIPO (PCT)
Prior art keywords
electrode tab
positive electrode
negative electrode
tab
current collector
Prior art date
Application number
PCT/JP2012/068311
Other languages
French (fr)
Japanese (ja)
Inventor
阿部一博
玉谷康浩
Original Assignee
株式会社村田製作所
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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 WO2013018551A1 publication Critical patent/WO2013018551A1/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
    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • 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, for example, a battery such as a lithium ion secondary battery, and more specifically, a power generation element formed by laminating a positive electrode layer and a negative electrode layer via a separator is housed in an exterior body and is used for current collection
  • the present invention relates to a battery having a structure in which a positive electrode tab that is electrically connected to a positive electrode layer and a negative electrode tab that is electrically connected to a negative electrode layer are drawn out of an exterior body through the electrode lead.
  • 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.
  • a laminated body in which a plurality of positive electrode members and negative electrode members are laminated via a separator is housed in an exterior body (housing).
  • the thing of the structure which consists of is widely used.
  • the power generation element 111 having the separator 111C interposed between the positive electrode layer (positive electrode plate) 111A and the negative electrode layer (negative electrode plate) 111B of the battery 110 is sandwiched and covered by the laminate films 112 and 113 from both sides.
  • the peripheral part is joined and sealed by heat welding.
  • a current collecting electrode lead (current collector) 111D, 111E is connected to the positive electrode layer 111A and the negative electrode layer 111B, respectively, and the other end of the electrode lead 111D, 111E is connected to the positive electrode tab 114 and the negative electrode tab 115, respectively.
  • the leading end portions of the positive electrode tab 114 and the negative electrode tab 115 of the battery 110 drawn out from the joint portions 116 with the laminate films 112 and 113 are connected to bus bars 117 and 118 (external circuits). Between the connecting portions P1 and P2 of the positive electrode tab 114 and the negative electrode tab 115 and the bus bars 117 and 118 to the connecting portions Q1 and Q2 of the electrode leads 111D and 111E, a convex portion 120 serving as a vibration absorbing portion is provided.
  • Such a battery 110 is formed of a low-strength material such as a thin metal foil because vibrations transmitted from the bus bars 117 and 118 to the positive electrode tab and the negative electrode tab are absorbed by the vibration absorption part (convex part 120). It is said that it is possible to suppress and prevent the vibration from being input to the electrode lead and to prevent mechanical damage inside the battery such as breakage of the electrode lead.
  • the present invention solves the above-mentioned problem, even when a large stress is applied to the positive electrode tab and the negative electrode tab that are electrically connected to the positive electrode layer (positive electrode plate) and the negative electrode layer (negative electrode plate) through the current collector, Providing a highly reliable battery that can reliably prevent the occurrence of breakage and the occurrence of short-circuits in each current collector, and the connection between the current collector and the positive electrode tab and the negative electrode tab and the current collector. Objective.
  • the battery of the present invention (Claim 1)
  • a negative electrode tab connected to the negative electrode layer through a negative electrode current collector is a battery having a structure drawn out of the exterior body, When a predetermined stress or more is applied to the positive electrode tab and / or the negative electrode tab, the positive electrode current collector, the negative electrode current collector, a connection portion between the positive electrode current collector and the positive electrode tab, and the negative electrode current collector An area to be broken having a strength that breaks before any of the connecting portions between the electric body and the negative electrode tab is provided in a predetermined area located outside the exterior body of the positive electrode tab and the negative electrode tab. It is characterized by being.
  • the positive electrode tab and the planned fracture region of the positive electrode tab may be a joint portion that joins the members constituting the positive electrode tab and the members constituting the negative electrode tab. preferable.
  • the rupture-scheduled regions of the positive electrode tab and the negative electrode tab are subjected to predetermined processing on the positive electrode tab and the negative electrode tab, and the strength is made smaller than portions other than the rupture-scheduled region. A region is preferred.
  • the processing is preferably processing in which at least one selected from the group consisting of a through hole, a bottomed hole, a groove, and a notch is provided on the positive electrode tab and the negative electrode tab.
  • the positive electrode tab and the negative electrode tab include a curved portion, and the planned fracture region is provided in the curved portion.
  • the battery of the present invention (invention 1) is a positive electrode tab and / or a negative electrode tab when a positive electrode tab and / or a negative electrode tab are subjected to a stress greater than or equal to a predetermined value in a predetermined region located outside the exterior body.
  • An area to be ruptured having a strength that breaks before any of the connecting portion between the electric current collector, the negative electrode current collector, the positive electrode current collector and the positive electrode tab, and the connecting portion between the negative electrode current collector and the negative electrode tab is provided.
  • a large stress is applied to the positive electrode tab and the negative electrode tab by setting the joint portion where the members constituting the positive electrode tab and the members constituting the negative electrode tab are joined to each other as a planned fracture region.
  • the joint portion is peeled to form a fracture region. Therefore, it is possible to easily and reliably provide a planned fracture region that breaks earlier than other regions, and the present invention can be effectively realized.
  • the region to be broken can be easily and reliably formed by setting a region in which the strength to be broken by processing the cathode tab and the anode tab is reduced.
  • breaking strength is reduced by applying at least one type selected from the group consisting of a through hole, a bottomed hole, a groove, and a notch to the positive electrode tab and the negative electrode tab as in claim 4,
  • a region that breaks before the region can be easily and reliably formed, which is preferable.
  • the positive electrode tab and the negative electrode tab are provided with a curved portion and a planned fracture region is provided in the curved portion, the vibration applied to the positive electrode tab and the negative electrode tab from the outside is provided. It is possible to fulfill the function of absorbing stress and stress, and when greater stress is applied to the positive electrode tab and negative electrode tab, the planned fracture area provided in the curved part breaks before other parts. Thus, it is possible to provide a more reliable battery without increasing the size of the product.
  • FIG. 1 is a cross-sectional view showing a configuration of a battery according to one embodiment (Example 1) of the present invention (in this Example 1, a lithium ion secondary battery).
  • a battery (lithium ion secondary battery) 100 includes a power generation element 10, an exterior body 20 that houses and seals the power generation element 10, and a plurality of foil shapes.
  • the positive electrode tab (positive electrode terminal) 31 and the negative electrode tab (negative electrode terminal) 32 that are connected to the power generation element 10 through the positive electrode current collector 41a and the negative electrode current collector 41b and led out from the peripheral edge of the outer package 20 I have.
  • the power generation element 10 includes a plurality of positive electrode layers 11 having a positive electrode active material and a current collector, a plurality of negative electrode layers 12, a plurality of separators 13, and a non-aqueous electrolyte (electrolyte) 14. And the positive electrode layer 11 and the negative electrode layer 12 are alternately stacked via the separator 13 to form a stacked body 10a.
  • stacking aspect, etc. A various deformation
  • stacked and wound the positive electrode layer and the negative electrode layer so that it might mutually oppose through a separator is also contained.
  • Example 1 as the positive electrode layer 11, for example, a positive electrode compound containing LiCoO 2 as a positive electrode active material, polyvinylidene fluoride (PVDF) as a binder, and acetylene black as a conductive auxiliary agent.
  • a plate-like positive electrode layer formed by applying an agent on the surface of a positive electrode plate made of an aluminum foil and drying to dispose a positive electrode active material layer on the surface of the positive electrode plate is used.
  • the part which the surface of the aluminum foil exposed is provided in the edge part of the aluminum foil as a collector, without apply
  • the negative electrode layer 12 for example, a negative electrode mixture containing a graphite-based material as a negative electrode active material and polyvinylidene fluoride (PVDF) as a binder is applied on the surface of a negative electrode plate made of copper foil.
  • PVDF polyvinylidene fluoride
  • the part which the surface of copper foil exposed is provided in the edge part of copper foil as an electrical power collector, without apply
  • separator 13 a sheet-like separator made of a microporous polyethylene film is used.
  • the nonaqueous electrolyte solution 14 As an electrolyte, LiPF 6 was mixed with 1.0 mol / L of a non-aqueous solvent in which propylene carbonate, ethylene carbonate, and diethyl carbonate were mixed at a volume ratio of 5:25:70. What was melt
  • the non-aqueous solvent and the supporting salt are not limited to these, and materials used for conventional batteries can be used without limitation.
  • the electrolyte may be a gel or solid electrolyte.
  • the plurality of positive electrode layers 11 are connected to the positive electrode tab 31 via a plurality of positive electrode current collectors 41a, and the plurality of negative electrode layers 12 are also connected to the negative electrode tabs 32 via a plurality of negative electrode current collectors 41b. Yes.
  • the exterior body 20 is formed by joining the two upper and lower laminate sheets 20a and 20b to each other at the periphery thereof.
  • the laminate sheets 20a and 20b constituting the outer package 20 a laminate sheet in which an outer protective layer made of resin, an intermediate gas barrier layer made of aluminum, and an inner adhesive layer made of resin are laminated and integrated ( Aluminum laminate film) is used.
  • the kind of the laminate sheet used as the exterior body 20 is not limited to the aluminum laminate film as described above, and other configurations can be used in the same manner.
  • curved portions 31a and 32a are formed in predetermined regions of the positive electrode tab 31 and the negative electrode tab 32 located outside the exterior body 20, respectively, and the curved portion 31a.
  • 32a when a predetermined stress or more is applied to the positive electrode tab 31 and the negative electrode tab 32, the positive electrode current collector 41a, the negative electrode current collector 41b, or the connecting portion between the positive electrode current collector 41a and the positive electrode tab 31,
  • rupture-scheduled regions 31x and 32x having such strength that they break before any of the connecting portions between the negative electrode current collector 41b and the negative electrode tab 32.
  • the expected break region 31x of the positive electrode tab 31 is formed by joining the positive electrode tab constituting members 131a and 131b constituting the positive electrode tab 31, and the expected break region 32x of the negative electrode tab 32 is formed. Similarly, the negative electrode tab constituting members 132a and 132b constituting the negative electrode tab 32 are joined together.
  • the positive electrode tab 31 is composed of a pair of positive electrode tab components 131a and 131b
  • the negative electrode tab 32 is composed of a pair of negative electrode tab components 132a and 132b.
  • the negative electrode tab 32 may be composed of three or more tab constituent members.
  • the battery 100 of Example 1 is provided with the planned fracture regions 31x and 32x in the positive electrode tab 31 and the negative electrode tab 32, a large force was applied to the positive electrode tab 31 and the negative electrode tab 32.
  • the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the connection portion between the negative electrode current collector 41b and the negative electrode tab 32 are broken before any of them.
  • the planned areas 31x and 32x are broken.
  • the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the negative electrode current collector It is possible to prevent the connection portion between 41b and the negative electrode tab 32 from being broken, and to prevent an electrical short circuit between the positive electrode layer 11 and the negative electrode layer 12.
  • the joint part which joined the member (positive electrode tab structural member 131a, 131b) which comprises the positive electrode tab 31, and the member (negative electrode tab structural member 132a, 132b) which comprises the negative electrode tab is set to the fracture
  • the positive electrode tab 31 and the negative electrode tab 32 are provided with the curved portions 31a and 32a, and the curved portions 31a and 32a are provided with the planned fracture regions 31x and 32x.
  • a large stress is applied to the portions 31a and 32a in the function as a vibration absorbing portion that absorbs vibration transmitted from the outside to the positive electrode tab 31 and the negative electrode tab 32, and the planned fracture regions 31x and 32x provided in the curved portions 31a and 32a.
  • the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the connection portion between the negative electrode current collector 41b and the negative electrode tab 32 are preceded. It is possible to provide a battery with high reliability without causing an increase in size of the positive electrode tab 31, the negative electrode tab 32, and the like.
  • FIG. 2 is a cross-sectional view showing a configuration of a battery according to another embodiment (Example 2) of the present invention
  • FIG. 3 is a plan view showing a main part thereof. 2 and 3, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.
  • a plurality of through holes 50 are provided at predetermined intervals in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32 so as to extend from one end side to the other end side in the width direction by laser processing.
  • the fracture planned areas 31x and 32x are formed in the curved portions 31a and 32a.
  • FIG. 3 shows a case where the through hole 50 is a hole having a circular planar shape.
  • the shape of the through hole is not particularly limited, and the planar shape may be, for example, a rectangular shape. There are no particular restrictions on the size and pitch of the through holes, and various applications and modifications can be made according to the required breaking strength.
  • the regions are assumed to be the regions to be broken 31x and 32x.
  • the expected fracture regions 31x and 32x can be broken before the connecting portion between the negative electrode current collector 41b and the negative electrode tab 32.
  • the positive electrode current collector 41a and the negative electrode current collector 41b can be broken.
  • connection between the positive electrode current collector 41a and the positive electrode tab 31 and the connection between the negative electrode current collector 41b and the negative electrode tab 32 are prevented from breaking, and the electrical connection between the positive electrode layer 11 and the negative electrode layer 12 is prevented.
  • Preventive short circuit It can be.
  • Example 2 the through holes 50 were formed in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32 by laser processing to form the planned fracture regions 31x and 32x. It is also possible to form a narrow portion having a narrower width than other regions, and to make this narrow portion a planned fracture region.
  • FIG. 4 shows a state in which a narrow width portion 51 narrower than other regions is formed in a part of the negative electrode tab 32, and the narrow width portion 51 is set as a planned fracture region 32x.
  • the positive electrode tab is similarly provided with a narrow portion as a planned fracture region.
  • notches may be formed at both ends in the width direction of the positive electrode tab and the negative electrode tab.
  • FIG. 5 shows a state in which notches 52 are formed at both ends of the negative electrode tab 32 in the width direction, and a region where the notches 52 are formed is set as a planned fracture region 32x.
  • the positive electrode tab is also provided with a notch as a planned fracture region.
  • there are no particular restrictions on the shape and arrangement of the notches 52 and various shapes and arrangements that can reduce the breaking strength are possible. For example, it is also possible to form a notch part only in the one side of the positive electrode tab and the negative electrode tab in the width direction.
  • a thin portion having a thickness smaller than that of the other region in a part of the positive electrode tab and the negative electrode tab it is also possible to form a thin portion having a thickness smaller than that of the other region in a part of the positive electrode tab and the negative electrode tab, and to make this thin portion a planned fracture region.
  • 6 (a) and 6 (b) as a thin portion, a groove 53 extending from one end side to the other end side in the width direction of the negative electrode tab 32 is formed, and this groove (thin portion) 53 is defined as a planned fracture region 32x. Indicates the state.
  • the positive electrode tab is also provided with a thin portion as a planned fracture region.
  • the thin part should form a continuous groove or a discontinuous groove from one end side to the other end side in the width direction of the positive electrode tab and the negative electrode tab, or form a bottomed hole at a predetermined pitch. Can be formed.
  • the fracture regions 31x and 32x are formed in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32.
  • the positive electrode tab and the negative electrode tab are provided. Since the basic effect can be obtained if the planned fracture region is provided, it is possible to adopt a configuration without the curved portion.
  • the positive electrode tab and the negative electrode tab are provided with a curved portion, it is possible to form a planned fracture region at a position other than the curved portion of the positive electrode tab and the negative electrode tab.
  • the present invention is not limited to the above embodiment, and a plurality of planned fracture regions and curved portions may be provided on one tab.

Abstract

Provided is a battery with high reliability that can assuredly prevent occurrences of breakage in current collectors and connecting parts between the positive electrode tab and the negative electrode tab and the current collectors and occurrences of shorts caused by the same even when a large stress is applied to the positive electrode tab connected to the positive electrode layers through the positive current collectors and the negative electrode tab connected to the negative electrode layers through the negative current collectors. Breakage preparation regions (31x, 32x) having strength such that they break before positive current collectors (41a), negative current collectors (41b), connecting parts between the positive current collectors (41a) and the positive electrode tab (31), and connecting parts between the negative current collectors (41b) and the negative electrode tab (32), when a prescribed stress or greater is applied to a positive electrode tab (31) and a negative electrode tab (32), are provided in a prescribed region of the positive electrode tab (31) and negative electrode tab (32) positioned on the outside of an outer housing (20).

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、正極層と負極層とをセパレータを介して積層してなる発電要素が外装体の内部に収納され、かつ、集電用の電極リードを介して正極層と導通する正極タブおよび負極層と導通する負極タブが、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, for example, a battery such as a lithium ion secondary battery, and more specifically, a power generation element formed by laminating a positive electrode layer and a negative electrode layer via a separator is housed in an exterior body and is used for current collection The present invention relates to a battery having a structure in which a positive electrode tab that is electrically connected to a positive electrode layer and a negative electrode tab that is electrically connected to a negative electrode layer are drawn out of an exterior body through the electrode lead.
　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。 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.
　ところで、このような二次電池（以下、単に「電池」ともいう）としては、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された積層体を外装体（筐体）内に収納してなる構成のものが広く用いられている。 By the way, as such a secondary battery (hereinafter also simply referred to as “battery”), a laminated body in which a plurality of positive electrode members and negative electrode members are laminated via a separator is housed in an exterior body (housing). The thing of the structure which consists of is widely used.
　そのような電池の１つとして、図７に示すような電池が提案されている（特許文献１参照）。 As one of such batteries, a battery as shown in FIG. 7 has been proposed (see Patent Document 1).
　図７に示す通り、電池１１０の正極層（正極板）１１１Ａと負極層（負極板）１１１Ｂとの間にセパレータ１１１Ｃを介在させた発電要素１１１が両面からラミネートフィルム１１２，１１３で挟まれて覆われ、その周縁部が熱溶着で接合されて密封されている。 As shown in FIG. 7, the power generation element 111 having the separator 111C interposed between the positive electrode layer (positive electrode plate) 111A and the negative electrode layer (negative electrode plate) 111B of the battery 110 is sandwiched and covered by the laminate films 112 and 113 from both sides. The peripheral part is joined and sealed by heat welding.
　また、正極層１１１Ａおよび負極層１１１Ｂにそれぞれ集電用の電極リード（集電体）１１１Ｄ，１１１Ｅの一端が接続され、電極リード１１１Ｄ，１１１Ｅの他端が正極タブ１１４および負極タブ１１５にそれぞれ接続されている。 Also, one end of a current collecting electrode lead (current collector) 111D, 111E is connected to the positive electrode layer 111A and the negative electrode layer 111B, respectively, and the other end of the electrode lead 111D, 111E is connected to the positive electrode tab 114 and the negative electrode tab 115, respectively. Has been.
　電池１１０の正極タブ１１４および負極タブ１１５におけるラミネートフィルム１１２，１１３との接合部分１１６から外部に引き出した先端部がバスバー１１７，１１８（外部回路）に接続されている。正極タブ１１４および負極タブ１１５とバスバー１１７，１１８との接続部Ｐ１，Ｐ２から電極リード１１１Ｄ，１１１Ｅの接続部Ｑ１，Ｑ２に至る間に、振動吸収部となる凸部１２０が設けられている。 The leading end portions of the positive electrode tab 114 and the negative electrode tab 115 of the battery 110 drawn out from the joint portions 116 with the laminate films 112 and 113 are connected to bus bars 117 and 118 (external circuits). Between the connecting portions P1 and P2 of the positive electrode tab 114 and the negative electrode tab 115 and the bus bars 117 and 118 to the connecting portions Q1 and Q2 of the electrode leads 111D and 111E, a convex portion 120 serving as a vibration absorbing portion is provided.
　このような電池１１０は、バスバー１１７，１１８から正極タブおよび負極タブに伝達された振動が、振動吸収部（凸部１２０）で吸収されるため、薄い金属箔などの強度の低い材料で形成した電極リードに振動が入力されることを抑制、防止して、電極リードの折損など電池内部での機械的な破損を防止することができるとされている。 Such a battery 110 is formed of a low-strength material such as a thin metal foil because vibrations transmitted from the bus bars 117 and 118 to the positive electrode tab and the negative electrode tab are absorbed by the vibration absorption part (convex part 120). It is said that it is possible to suppress and prevent the vibration from being input to the electrode lead and to prevent mechanical damage inside the battery such as breakage of the electrode lead.
　しかしながら、上述のような構造を有する電池の場合、振動やヒートショックなどにより不所望な外部応力が加わると、電池内部における、正極タブ１１４、負極タブ１１５と、電極リード（集電体）１１１Ｄ，１１１Ｅの端部との溶着部が最も破損しやすく、この正、負極タブ１１４，１１５と、電極リード（集電体）１１１Ｄ，１１１Ｅの端部との溶着部において破断が発生した場合、正極層と負極層の短絡を招くおそれがある。 However, in the case of the battery having the above-described structure, when an undesired external stress is applied due to vibration or heat shock, the positive electrode tab 114, the negative electrode tab 115, and the electrode lead (current collector) 111D, When the welded portion between the end portion of 111E is most easily damaged and the fracture occurs at the welded portion between the positive and negative electrode tabs 114, 115 and the end portions of the electrode leads (current collectors) 111D, 111E, the positive electrode layer There is a risk of short-circuiting the negative electrode layer.
　また、上記従来の電池の場合、正極タブや負極タブにさらに大きな応力（例えば、振動吸収部となる凸部１２０が伸びきってしまうような応力）がかかった場合、応力が電池内部にまで伝わり、電極リード（集電体）１１１Ｄ、１１１Ｅが破断し、これが原因で、正極層と負極層の短絡を引き起こす場合がある。 In the case of the above conventional battery, when a larger stress is applied to the positive electrode tab or the negative electrode tab (for example, a stress that causes the convex portion 120 serving as the vibration absorbing portion to extend), the stress is transmitted to the inside of the battery. The electrode leads (current collectors) 111D and 111E are broken, which may cause a short circuit between the positive electrode layer and the negative electrode layer.
特開２００４－３９２７４号公報JP 2004-39274 A
　本発明は、上記課題を解決するものであり、正極層（正極板）および負極層（負極板）と集電体を介して導通する正極タブおよび負極タブに大きな応力が加わった場合にも、各集電体や、正極タブおよび負極タブと集電体との接続部などにおける破断の発生とそれによるショートの発生を確実に防止することが可能で、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 tab and the negative electrode tab that are electrically connected to the positive electrode layer (positive electrode plate) and the negative electrode layer (negative electrode plate) through the current collector, Providing a highly reliable battery that can reliably prevent the occurrence of breakage and the occurrence of short-circuits in each current collector, and the connection between the current collector and the positive electrode tab and the negative electrode tab and the current collector. Objective.
　上記課題を解決するために、本発明（請求項１）の電池は、
　正極層と負極層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発電要素が、外装体の内部に収納され、かつ、正極集電体を介して前記正極層と導通する正極タブと、負極集電体を介して前記負極層と導通する負極タブとが、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、
　前記正極タブおよび／または前記負極タブに所定以上の応力が加わったときに、前記正極集電体、前記負極集電体、前記正極集電体と前記正極タブとの接続部、および前記負極集電体と前記負極タブとの接続部のいずれよりも先に破断するような強度を有する破断予定領域が、前記正極タブおよび前記負極タブの、前記外装体の外側に位置する所定の領域に設けられていること
　を特徴としている。 In order to solve the above problems, the battery of the present invention (Claim 1)
A power generation element in which a positive electrode layer and a negative electrode layer are laminated so as to face each other with a separator interposed between the positive electrode layer and the positive electrode layer that is housed in an exterior body and is electrically connected to the positive electrode layer through a positive electrode current collector A negative electrode tab connected to the negative electrode layer through a negative electrode current collector is a battery having a structure drawn out of the exterior body,
When a predetermined stress or more is applied to the positive electrode tab and / or the negative electrode tab, the positive electrode current collector, the negative electrode current collector, a connection portion between the positive electrode current collector and the positive electrode tab, and the negative electrode current collector An area to be broken having a strength that breaks before any of the connecting portions between the electric body and the negative electrode tab is provided in a predetermined area located outside the exterior body of the positive electrode tab and the negative electrode tab. It is characterized by being.
　また、請求項２のように、前記正極タブおよび前記正極タブの前記破断予定領域は、前記正極タブを構成する部材どうし、および前記負極タブを構成する部材どうしを接合した接合部であることが好ましい。 Further, as in claim 2, the positive electrode tab and the planned fracture region of the positive electrode tab may be a joint portion that joins the members constituting the positive electrode tab and the members constituting the negative electrode tab. preferable.
　また、請求項３のように、前記正極タブおよび前記負極タブの前記破断予定領域は、前記正極タブおよび前記負極タブに所定の加工を施して、前記破断予定領域以外の部分より強度を小さくした領域であることが好ましい。 Further, as in claim 3, the rupture-scheduled regions of the positive electrode tab and the negative electrode tab are subjected to predetermined processing on the positive electrode tab and the negative electrode tab, and the strength is made smaller than portions other than the rupture-scheduled region. A region is preferred.
　また、請求項４のように、前記加工は、前記正極タブおよび前記負極タブに貫通孔、有底穴、溝、切り欠きからなる群より選ばれる少なくとも１種を設ける加工であることが好ましい。 Further, as in claim 4, the processing is preferably processing in which at least one selected from the group consisting of a through hole, a bottomed hole, a groove, and a notch is provided on the positive electrode tab and the negative electrode tab.
　また、請求項５のように、前記正極タブおよび前記負極タブが、湾曲部を備えており、かつ、前記湾曲部に前記破断予定領域が設けられていることが好ましい。 Further, as in claim 5, it is preferable that the positive electrode tab and the negative electrode tab include a curved portion, and the planned fracture region is provided in the curved portion.
　本発明（請求項１）の電池は、正極タブおよび負極タブの、外装体の外側に位置する所定の領域に、正極タブおよび／または負極タブに所定以上の応力が加わったときに、正極集電体、負極集電体、正極集電体と正極タブとの接続部、および負極集電体と負極タブとの接続部のいずれよりも先に破断するような強度を有する破断予定領域を設けるようにしているので、各集電体とタブとの接続部や、各集電体自体の破断に伴う電気的な短絡を防止することが可能で、信頼性の高い電池を提供することが可能になる。 The battery of the present invention (invention 1) is a positive electrode tab and / or a negative electrode tab when a positive electrode tab and / or a negative electrode tab are subjected to a stress greater than or equal to a predetermined value in a predetermined region located outside the exterior body. An area to be ruptured having a strength that breaks before any of the connecting portion between the electric current collector, the negative electrode current collector, the positive electrode current collector and the positive electrode tab, and the connecting portion between the negative electrode current collector and the negative electrode tab is provided. As a result, it is possible to prevent electrical short-circuiting due to breakage of each current collector and tab and each current collector itself, and it is possible to provide a highly reliable battery. become.
　また、請求項２のように、正極タブを構成する部材どうし、および負極タブを構成する部材どうしを接合した接合部を破断予定領域とすることにより、正極タブおよび負極タブに大きな応力が加わったときに、接合部が剥離することで破断領域となるので、他の領域よりも先に破断する破断予定領域を容易かつ確実に設けることが可能になり、本発明を実効あらしめることができる。 Further, as described in claim 2, a large stress is applied to the positive electrode tab and the negative electrode tab by setting the joint portion where the members constituting the positive electrode tab and the members constituting the negative electrode tab are joined to each other as a planned fracture region. In some cases, the joint portion is peeled to form a fracture region. Therefore, it is possible to easily and reliably provide a planned fracture region that breaks earlier than other regions, and the present invention can be effectively realized.
　また、請求項３のように、正極タブおよび負極タブに、加工を施して破断する強度を小さくした領域を破断予定領域とすることによっても、破断予定領域を容易かつ確実に形成することができる。 Further, as described in claim 3, the region to be broken can be easily and reliably formed by setting a region in which the strength to be broken by processing the cathode tab and the anode tab is reduced. .
　また、請求項４のように、正極タブおよび負極タブに貫通孔、有底穴、溝、切り欠きからなる群より選ばれる少なくとも１種を設ける加工を施すことにより破断強度を小さくした場合、他の領域よりも先に破断する領域を容易かつ確実に形成することができて好ましい。 In addition, when the breaking strength is reduced by applying at least one type selected from the group consisting of a through hole, a bottomed hole, a groove, and a notch to the positive electrode tab and the negative electrode tab as in claim 4, A region that breaks before the region can be easily and reliably formed, which is preferable.
　また、請求項５のように、正極タブおよび負極タブに湾曲部を設けるとともに、この湾曲部に破断予定領域を設けるようにした場合、湾曲部に、外部から正極タブや負極タブに加わった振動や応力を吸収する機能を果たさせることが可能になるとともに、正極タブや負極タブにさらに大きな応力が加わった場合には、湾曲部に設けた破断予定領域が他の部分よりも先に破断する機能を発揮することから、製品の大型化を招くことなく、さらに信頼性の高い電池を提供することが可能になる。 In addition, when the positive electrode tab and the negative electrode tab are provided with a curved portion and a planned fracture region is provided in the curved portion, the vibration applied to the positive electrode tab and the negative electrode tab from the outside is provided. It is possible to fulfill the function of absorbing stress and stress, and when greater stress is applied to the positive electrode tab and negative electrode tab, the planned fracture area provided in the curved part breaks before other parts. Thus, it is possible to provide a more reliable battery without increasing the size of the product.
本発明の一実施例（実施例１）にかかる電池を示す断面図である。It is sectional drawing which shows the battery concerning one Example (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断面図である。It is sectional drawing which shows the battery concerning the other Example (Example 2) of this invention. 本発明の他の実施例（実施例２）にかかる電池の要部を示す平面図である。It is a top view which shows the principal part of the battery concerning the other Example (Example 2) of this invention. 本発明の実施例２の電池の変形例の要部を示す平面図である。It is a top view which shows the principal part of the modification of the battery of Example 2 of this invention. 本発明の実施例２の電池の他の変形例の要部を示す平面図である。It is a top view which shows the principal part of the other modification of the battery of Example 2 of this invention. (ａ)は本発明の実施例２の電池のさらに他の変形例の要部を示す平面図、(ｂ)は正面断面図である。(a) is a top view which shows the principal part of the other modification of the battery of Example 2 of this invention, (b) is front sectional drawing. 従来の電池の構成を示す断面図である。It is sectional drawing 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（この実施例１ではリチウムイオン二次電池）の構成を示す断面図である。 FIG. 1 is a cross-sectional view showing a configuration of a battery according to one embodiment (Example 1) of the present invention (in this Example 1, a lithium ion secondary battery).
　本発明の実施例１にかかる電池（リチウムイオン二次電池）１００は、図１に示すように、発電要素１０と、発電要素１０を収納して封止する外装体２０と、複数の箔状の正極集電体４１ａおよび負極集電体４１ｂを介して発電要素１０に接続され、外装体２０の周縁部から外部に導出された正極タブ（正極端子）３１および負極タブ（負極端子）３２を備えている。 As shown in FIG. 1, a battery (lithium ion secondary battery) 100 according to Example 1 of the present invention includes a power generation element 10, an exterior body 20 that houses and seals the power generation element 10, and a plurality of foil shapes. The positive electrode tab (positive electrode terminal) 31 and the negative electrode tab (negative electrode terminal) 32 that are connected to the power generation element 10 through the positive electrode current collector 41a and the negative electrode current collector 41b and led out from the peripheral edge of the outer package 20 I have.
　発電要素１０は、図１に示すように、正極活物質と集電体とを有する複数の正極層１１と、複数の負極層１２と、複数のセパレータ１３と、非水電解液（電解質）１４とを含み、正極層１１と負極層１２がセパレータ１３を介して交互に積層されることにより積層体１０ａが形成されている。なお、積層体１０ａを構成する各層の積層数や積層態様などには特別の制約はなく、電池として機能するものである範囲において種々の変形を加えることができる。例えば、正極層と負極層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巻回した積層体も含まれる。 As shown in FIG. 1, the power generation element 10 includes a plurality of positive electrode layers 11 having a positive electrode active material and a current collector, a plurality of negative electrode layers 12, a plurality of separators 13, and a non-aqueous electrolyte (electrolyte) 14. And the positive electrode layer 11 and the negative electrode layer 12 are alternately stacked via the separator 13 to form a stacked body 10a. In addition, there are no special restrictions in the lamination | stacking number of each layer which comprises the laminated body 10a, a lamination | stacking aspect, etc., A various deformation | transformation can be added in the range which functions as a battery. For example, the laminated body which laminated | stacked and wound the positive electrode layer and the negative electrode layer so that it might mutually oppose through a separator is also contained.
　また、この実施例１では、正極層１１として、例えば、正極活物質であるＬｉＣｏＯ2と、結着剤であるポリフッ化ビニリデン（ＰＶＤＦ）と、導電助剤であるアセチレンブラックとを含有する正極合剤を、アルミニウム箔からなる正極板の表面上に塗布、乾燥して、正極活物質層を正極板の表面上に配設することにより形成された板状の正極層が用いられている。なお、集電体としてのアルミニウム箔の端部には、正極合剤を塗布せずに、アルミニウム箔の表面が露出した部分が設けられている。 Further, in Example 1, as the positive electrode layer 11, for example, a positive electrode compound containing LiCoO 2 as a positive electrode active material, polyvinylidene fluoride (PVDF) as a binder, and acetylene black as a conductive auxiliary agent. A plate-like positive electrode layer formed by applying an agent on the surface of a positive electrode plate made of an aluminum foil and drying to dispose a positive electrode active material layer on the surface of the positive electrode plate is used. In addition, the part which the surface of the aluminum foil exposed is provided in the edge part of the aluminum foil as a collector, without apply | coating a positive mix.
　また、負極層１２として、例えば、負極活物質であるグラファイト系材料と、結着剤であるポリフッ化ビニリデン（ＰＶＤＦ）とを含有する負極合剤を、銅箔からなる負極板の表面上に塗布、乾燥して、負極活物質層を負極板の表面上に配設することにより形成された板状の負極層が用いられている。なお、集電体としての銅箔の端部には、負極合剤を塗布せずに、銅箔の表面が露出した部分が設けられている。 Moreover, as the negative electrode layer 12, for example, a negative electrode mixture containing a graphite-based material as a negative electrode active material and polyvinylidene fluoride (PVDF) as a binder is applied on the surface of a negative electrode plate made of copper foil. A plate-like negative electrode layer formed by drying and disposing a negative electrode active material layer on the surface of the negative electrode plate is used. In addition, the part which the surface of copper foil exposed is provided in the edge part of copper foil as an electrical power collector, without apply | coating a negative mix.
　また、セパレータ１３としては、微孔性ポリエチレンフィルムからなるシート状のセパレータが用いられている。 Further, as the separator 13, a sheet-like separator made of a microporous polyethylene film is used.
　また、電解質としての非水電解液１４には、支持塩を非水溶媒に溶解して調製したものが用いられている。この実施例１では、非水電解液として、ＬｉＰＦ6を、炭酸プロピレンと炭酸エチレンと炭酸ジエチルとを体積比で５：２５：７０の割合で混合した非水溶媒に、１．０ｍｏｌ／Ｌの濃度となるように溶解したものが用いられている。なお、非水溶媒や支持塩はこれに限らず、従来の電池に用いられる材料を限定なく用いることができる。また、電解質は、ゲル状または固体状の電解質であってもよい。 Moreover, what was prepared by melt | dissolving a support salt in the nonaqueous solvent is used for the nonaqueous electrolyte solution 14 as an electrolyte. In Example 1, as a non-aqueous electrolyte, LiPF 6 was mixed with 1.0 mol / L of a non-aqueous solvent in which propylene carbonate, ethylene carbonate, and diethyl carbonate were mixed at a volume ratio of 5:25:70. What was melt | dissolved so that it might become a density | concentration is used. The non-aqueous solvent and the supporting salt are not limited to these, and materials used for conventional batteries can be used without limitation. The electrolyte may be a gel or solid electrolyte.
　さらに、複数の正極層１１は複数の正極集電体４１ａを介して正極タブ３１に接続されており、複数の負極層１２も複数の負極集電体４１ｂを介して負極タブ３２に接続されている。 Further, the plurality of positive electrode layers 11 are connected to the positive electrode tab 31 via a plurality of positive electrode current collectors 41a, and the plurality of negative electrode layers 12 are also connected to the negative electrode tabs 32 via a plurality of negative electrode current collectors 41b. Yes.
　また、この実施例１の電池１００においては、外装体２０が、上下２枚のラミネートシート２０ａ，２０ｂをその周縁部において互いに接合することにより形成されている。 Further, in the battery 100 of the first embodiment, the exterior body 20 is formed by joining the two upper and lower laminate sheets 20a and 20b to each other at the periphery thereof.
　外装体２０を構成するラミネートシート２０ａ，２０ｂとしては、樹脂からなる外側の保護層と、アルミニウムからなる中間のガスバリア層と、樹脂からなる内側の接着層とを積層して一体化したラミネートシート（アルミニウムラミネートフィルム）が用いられている。なお、外装体２０として用いられるラミネートシートの種類は、上述のようなアルミニウムラミネートフィルムに限らず、他の構成のものも同様に用いることができる。 As the laminate sheets 20a and 20b constituting the outer package 20, a laminate sheet in which an outer protective layer made of resin, an intermediate gas barrier layer made of aluminum, and an inner adhesive layer made of resin are laminated and integrated ( Aluminum laminate film) is used. In addition, the kind of the laminate sheet used as the exterior body 20 is not limited to the aluminum laminate film as described above, and other configurations can be used in the same manner.
　そして、この実施例１の電池１００において、正極タブ３１および負極タブ３２の、外装体２０の外側に位置する所定の領域には、それぞれ湾曲部３１ａおよび３２ａが形成されているとともに、湾曲部３１ａ，３２ａには、正極タブ３１および負極タブ３２に所定以上の応力が加わったときに、正極集電体４１ａ、負極集電体４１ｂ、あるいは正極集電体４１ａと正極タブ３１との接続部、および負極集電体４１ｂと負極タブ３２との接続部のいずれよりも先に破断するような強度を有する破断予定領域３１ｘ，３２ｘが設けられている。 In the battery 100 of the first embodiment, curved portions 31a and 32a are formed in predetermined regions of the positive electrode tab 31 and the negative electrode tab 32 located outside the exterior body 20, respectively, and the curved portion 31a. 32a, when a predetermined stress or more is applied to the positive electrode tab 31 and the negative electrode tab 32, the positive electrode current collector 41a, the negative electrode current collector 41b, or the connecting portion between the positive electrode current collector 41a and the positive electrode tab 31, In addition, there are provided rupture-scheduled regions 31x and 32x having such strength that they break before any of the connecting portions between the negative electrode current collector 41b and the negative electrode tab 32.
　この実施例１の電池１００では、正極タブ３１の破断予定領域３１ｘは、正極タブ３１を構成する正極タブ構成部材１３１ａ，１３１ｂを接合することにより形成されており、負極タブ３２の破断予定領域３２ｘも、同様に、負極タブ３２を構成する負極タブ構成部材１３２ａ，１３２ｂを接合することにより形成されている。 In the battery 100 of the first embodiment, the expected break region 31x of the positive electrode tab 31 is formed by joining the positive electrode tab constituting members 131a and 131b constituting the positive electrode tab 31, and the expected break region 32x of the negative electrode tab 32 is formed. Similarly, the negative electrode tab constituting members 132a and 132b constituting the negative electrode tab 32 are joined together.
　正極タブ構成部材１３１ａ，１３１ｂ、負極タブ構成部材１３２ａ，１３２ｂを接合する方法としては、
　(ａ)レーザ溶接、超音波溶接、抵抗溶接などの溶接による方法、
　(ｂ)はんだ付けなどの接合用金属材料を用いたろう付けによる方法、
　(ｃ)導電性接着剤を用いて接合する方法
　などが例示される。 As a method of joining the positive electrode tab constituent members 131a and 131b and the negative electrode tab constituent members 132a and 132b,
(a) welding methods such as laser welding, ultrasonic welding, resistance welding,
(b) a method by brazing using a joining metal material such as soldering;
(c) A method of joining using a conductive adhesive is exemplified.
　また、上記実施例１では、正極タブ３１を一対の正極タブ構成部材１３１ａ，１３１ｂから構成し、負極タブ３２を一対の負極タブ構成部材１３２ａ，１３２ｂから構成するようにしているが、正極タブ３１および負極タブ３２を３つ以上の複数のタブ構成部材から構成することも可能である。 In the first embodiment, the positive electrode tab 31 is composed of a pair of positive electrode tab components 131a and 131b, and the negative electrode tab 32 is composed of a pair of negative electrode tab components 132a and 132b. The negative electrode tab 32 may be composed of three or more tab constituent members.
　この実施例１の電池１００は、上述のように、正極タブ３１および負極タブ３２に、破断予定領域３１ｘ，３２ｘを設けるようにしているので、正極タブ３１および負極タブ３２に大きな力がかかったときに、正極集電体４１ａ、負極集電体４１ｂ、正極集電体４１ａと正極タブ３１との接続部、および負極集電体４１ｂと負極タブ３２との接続部のいずれよりも先に破断予定領域３１ｘ，３２ｘが破断する。 As described above, since the battery 100 of Example 1 is provided with the planned fracture regions 31x and 32x in the positive electrode tab 31 and the negative electrode tab 32, a large force was applied to the positive electrode tab 31 and the negative electrode tab 32. Sometimes, the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the connection portion between the negative electrode current collector 41b and the negative electrode tab 32 are broken before any of them. The planned areas 31x and 32x are broken.
　その結果、正極タブ３１および負極タブ３２に大きな力が加わった場合にも、正極集電体４１ａ、負極集電体４１ｂ、正極集電体４１ａと正極タブ３１との接続部、負極集電体４１ｂと負極タブ３２との接続部が破断することを防止して、正極層１１と負極層１２との電気的な短絡を防止することが可能になる。 As a result, even when a large force is applied to the positive electrode tab 31 and the negative electrode tab 32, the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the negative electrode current collector It is possible to prevent the connection portion between 41b and the negative electrode tab 32 from being broken, and to prevent an electrical short circuit between the positive electrode layer 11 and the negative electrode layer 12.
　また、正極タブ３１を構成する部材（正極タブ構成部材１３１ａ，１３１ｂ）どうし、および負極タブを構成する部材（負極タブ構成部材１３２ａ，１３２ｂ）どうしを接合した接合部を破断予定領域３１ｘ，３２ｘとするようにしているので、容易かつ確実に上述のような効果を奏する破断予定領域３１ｘ，３２ｘを形成することができる。 Moreover, the joint part which joined the member (positive electrode tab structural member 131a, 131b) which comprises the positive electrode tab 31, and the member (negative electrode tab structural member 132a, 132b) which comprises the negative electrode tab is set to the fracture | rupture planned area | regions 31x and 32x. Therefore, it is possible to easily and reliably form the planned fracture regions 31x and 32x that exhibit the above-described effects.
　また、上記実施例１の電池においては、正極タブ３１および負極タブ３２に湾曲部３１ａ，３２ａを設けるとともに、この湾曲部３１ａ，３２ａに破断予定領域３１ｘ，３２ｘを設けるようにしているので、湾曲部３１ａ，３２ａに、外部から正極タブ３１および負極タブ３２に伝達された振動を吸収する振動吸収部としての機能と、湾曲部３１ａ，３２ａに設けた破断予定領域３１ｘ，３２ｘに、大きな応力が加わったときに、正極集電体４１ａ、負極集電体４１ｂ、正極集電体４１ａと正極タブ３１との接続部、および負極集電体４１ｂと負極タブ３２との接続部のいずれよりも先に破断する機能を発揮させることが可能になり、正極タブ３１，負極タブ３２などの大型化を招くことなく、信頼性の高い電池を提供することができる。 In the battery of the first embodiment, the positive electrode tab 31 and the negative electrode tab 32 are provided with the curved portions 31a and 32a, and the curved portions 31a and 32a are provided with the planned fracture regions 31x and 32x. A large stress is applied to the portions 31a and 32a in the function as a vibration absorbing portion that absorbs vibration transmitted from the outside to the positive electrode tab 31 and the negative electrode tab 32, and the planned fracture regions 31x and 32x provided in the curved portions 31a and 32a. When added, the positive electrode current collector 41a, the negative electrode current collector 41b, the connection portion between the positive electrode current collector 41a and the positive electrode tab 31, and the connection portion between the negative electrode current collector 41b and the negative electrode tab 32 are preceded. It is possible to provide a battery with high reliability without causing an increase in size of the positive electrode tab 31, the negative electrode tab 32, and the like.
　図２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断面図であり、図３は、その要部を示す平面図である。
　なお、図２，３において、図１と同一符号を付した部分は同一または相当する部分を示す。 FIG. 2 is a cross-sectional view showing a configuration of a battery according to another embodiment (Example 2) of the present invention, and FIG. 3 is a plan view showing a main part thereof.
2 and 3, the same reference numerals as those in FIG. 1 denote the same or corresponding parts.
　この実施例２では、正極タブ３１および負極タブ３２の湾曲部３１ａ，３２ａに、レーザ加工により、幅方向の一端側から他端側にまで至るように、複数の貫通孔５０を所定の間隔をおいて（所定の配設ピッチで）形成することにより、湾曲部３１ａ，３２ａに破断予定領域３１ｘ，３２ｘを形成している。図３では、貫通５０が平面形状が円形の孔である場合を示しているが、貫通孔の形状に特別の制約はなく、平面形状が、例えば四角形のものであってもよい。なお、貫通孔の大きさ、配設ピッチなどにも特別の制約はなく、必要な破断強度に応じて種々の応用、変形を加えることが可能である。 In the second embodiment, a plurality of through holes 50 are provided at predetermined intervals in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32 so as to extend from one end side to the other end side in the width direction by laser processing. In this case, the fracture planned areas 31x and 32x are formed in the curved portions 31a and 32a. FIG. 3 shows a case where the through hole 50 is a hole having a circular planar shape. However, the shape of the through hole is not particularly limited, and the planar shape may be, for example, a rectangular shape. There are no particular restrictions on the size and pitch of the through holes, and various applications and modifications can be made according to the required breaking strength.
　このように、正極タブ３１および負極タブ３２に、形状的、構造的に他の領域よりも破断強度の小さい領域を形成して、当該領域を破断予定領域３１ｘ，３２ｘとするようにした場合にも、上記実施例１と同様に、正極タブ３１および負極タブ３に大きな力がかかったときに、正極集電体４１ａ、負極集電体４１ｂ、正極集電体４１ａと正極タブ３１との接続部、および負極集電体４１ｂと負極タブ３２との接続部よりも先に上記破断予定領域３１ｘ，３２ｘを破断させることが可能になり、結果として、正極集電体４１ａや負極集電体４１ｂ自体、正極集電体４１ａと正極タブ３１との接続部、および負極集電体４１ｂと負極タブ３２との接続部などが破断することを防止して、正極層１１と負極層１２との電気的な短絡を防止することができる。 As described above, when the positive electrode tab 31 and the negative electrode tab 32 are formed with regions having a breaking strength smaller than other regions in terms of shape and structure, the regions are assumed to be the regions to be broken 31x and 32x. As in Example 1, the positive electrode current collector 41a, the negative electrode current collector 41b, and the connection between the positive electrode current collector 41a and the positive electrode tab 31 when a large force is applied to the positive electrode tab 31 and the negative electrode tab 3. , And the expected fracture regions 31x and 32x can be broken before the connecting portion between the negative electrode current collector 41b and the negative electrode tab 32. As a result, the positive electrode current collector 41a and the negative electrode current collector 41b can be broken. As a result, the connection between the positive electrode current collector 41a and the positive electrode tab 31 and the connection between the negative electrode current collector 41b and the negative electrode tab 32 are prevented from breaking, and the electrical connection between the positive electrode layer 11 and the negative electrode layer 12 is prevented. Preventive short circuit It can be.
　なお、実施例２では、レーザ加工により正極タブ３１および負極タブ３２の湾曲部３１ａ，３２ａに貫通孔５０を形成して破断予定領域３１ｘ，３２ｘとしたが、正極タブおよび負極タブの一部に他の領域よりも幅の狭い狭幅部を形成し、この狭幅部を破断予定領域とすることも可能である。
　図４は、負極タブ３２の一部に他の領域よりも幅の狭い狭幅部５１を形成し、この狭幅部５１を破断予定領域３２ｘとした状態を示している。なお、この場合、特に図示しないが、正極タブにも同様に破断予定領域として、狭幅部が設けられることになる。 In Example 2, the through holes 50 were formed in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32 by laser processing to form the planned fracture regions 31x and 32x. It is also possible to form a narrow portion having a narrower width than other regions, and to make this narrow portion a planned fracture region.
FIG. 4 shows a state in which a narrow width portion 51 narrower than other regions is formed in a part of the negative electrode tab 32, and the narrow width portion 51 is set as a planned fracture region 32x. In this case, although not particularly illustrated, the positive electrode tab is similarly provided with a narrow portion as a planned fracture region.
　なお、狭幅部５１を形成するにあたっては、正極タブおよび負極タブの幅方向の両端部に切り欠きを形成するようにしてもよい。
　図５は、負極タブ３２の幅方向の両端部に切り欠き５２を形成し、この切り欠き５２が形成された領域を破断予定領域３２ｘとした状態を示している。
　なお、この場合、特に図示しないが、正極タブにも破断予定領域として、切り欠き部が設けられる。
　ただし、切り欠き５２の形状や配設態様に特別の制約はなく、破断強度を小さくすることが可能な種々の形状や配設態様とすることが可能である。また、例えば、正極タブおよび負極タブの幅方向の一方側にのみ切り欠き部を形成することも可能である。 In forming the narrow width portion 51, notches may be formed at both ends in the width direction of the positive electrode tab and the negative electrode tab.
FIG. 5 shows a state in which notches 52 are formed at both ends of the negative electrode tab 32 in the width direction, and a region where the notches 52 are formed is set as a planned fracture region 32x.
In this case, although not particularly illustrated, the positive electrode tab is also provided with a notch as a planned fracture region.
However, there are no particular restrictions on the shape and arrangement of the notches 52, and various shapes and arrangements that can reduce the breaking strength are possible. For example, it is also possible to form a notch part only in the one side of the positive electrode tab and the negative electrode tab in the width direction.
　また、正極タブおよび負極タブの一部に他の領域よりも厚みの小さい肉薄部を形成し、この肉薄部を破断予定領域とすることも可能である。
　図６(ａ)，(ｂ)は、肉薄部として、負極タブ３２の幅方向の一端側から他端側に至る溝５３を形成し、この溝（肉薄部）５３を破断予定領域３２ｘとした状態を示している。
　なお、この場合、特に図示しないが、正極タブにも破断予定領域として、肉薄部が設けられる。
　肉薄部は、正極タブおよび負極タブの幅方向の一端側から他端側にまで至るように連続する溝や不連続の溝を形成したり、有底穴を所定のピッチで形成したりすることにより形成することができる。 Moreover, it is also possible to form a thin portion having a thickness smaller than that of the other region in a part of the positive electrode tab and the negative electrode tab, and to make this thin portion a planned fracture region.
6 (a) and 6 (b), as a thin portion, a groove 53 extending from one end side to the other end side in the width direction of the negative electrode tab 32 is formed, and this groove (thin portion) 53 is defined as a planned fracture region 32x. Indicates the state.
In this case, although not particularly illustrated, the positive electrode tab is also provided with a thin portion as a planned fracture region.
The thin part should form a continuous groove or a discontinuous groove from one end side to the other end side in the width direction of the positive electrode tab and the negative electrode tab, or form a bottomed hole at a predetermined pitch. Can be formed.
　なお、上記実施例１，２では、正極タブ３１、負極タブ３２の湾曲部３１ａ，３２ａに破断予定領域３１ｘ，３２ｘを形成するようにしているが、本発明においては、正極タブ，負極タブが破断予定領域を備えていればその基本的な効果は得られるので、湾曲部を備えていない構成とすることも可能である。
　また、正極タブ，負極タブが湾曲部を備えている場合において、正極タブ、負極タブの湾曲部以外の位置に破断予定領域を形成することも可能である。 In the first and second embodiments, the fracture regions 31x and 32x are formed in the curved portions 31a and 32a of the positive electrode tab 31 and the negative electrode tab 32. However, in the present invention, the positive electrode tab and the negative electrode tab are provided. Since the basic effect can be obtained if the planned fracture region is provided, it is possible to adopt a configuration without the curved portion.
In addition, when the positive electrode tab and the negative electrode tab are provided with a curved portion, it is possible to form a planned fracture region at a position other than the curved portion of the positive electrode tab and the negative electrode tab.
　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、１つのタブに複数の破断予定領域や、湾曲部を設けたりすることも可能である。 In other respects, the present invention is not limited to the above embodiment, and a plurality of planned fracture regions and curved portions may be provided on one tab.
　１０　　　　　　　　発電要素
　１０ａ　　　　　　　積層体
　１１　　　　　　　　正極層
　１２　　　　　　　　負極層
　１３　　　　　　　　セパレータ
　１４　　　　　　　　非水電解液
　２０　　　　　　　　外装体
　２０ａ，２０ｂ　　　ラミネートシート
　３１　　　　　　　　正極タブ
　３１ａ　　　　　　　正極タブの湾曲部
　３１ｘ　　　　　　　正極タブの破断予定領域
　３２　　　　　　　　負極タブ
　３２ａ　　　　　　　負極タブの湾曲部
　３２ｘ　　　　　　　負極タブの破断予定領域
　４１ａ　　　　　　　正極集電体
　４１ｂ　　　　　　　負極集電体
　５０　　　　　　　　貫通孔
　５１　　　　　　　　狭幅部
　５２　　　　　　　　切り欠き
　５３　　　　　　　　溝（肉薄部）
　１００　　　　　　　電池
　１３１ａ，１３１ｂ　正極タブ構成部材
　１３２ａ，１３２ｂ　負極タブ構成部材 DESCRIPTION OF SYMBOLS 10 Electric power generation element 10a Laminated body 11 Positive electrode layer 12 Negative electrode layer 13 Separator 14 Nonaqueous electrolyte 20 Exterior body 20a, 20b Laminate sheet 31 Positive electrode tab 31a Curved part of positive electrode tab 31x Planned fracture area of positive electrode tab 32 Negative electrode tab 32a Curved portion 32x Negative electrode tab expected break region 41a Positive electrode current collector 41b Negative electrode current collector 50 Through hole 51 Narrow width portion 52 Notch 53 Groove (thin portion)
100 Battery 131a, 131b Positive Tab Constituent Member 132a, 132b Negative Tab Constituent Member

Claims (5)

  1. 　正極層と負極層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発電要素が、外装体の内部に収納され、かつ、正極集電体を介して前記正極層と導通する正極タブと、負極集電体を介して前記負極層と導通する負極タブとが、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、
    　前記正極タブおよび／または前記負極タブに所定以上の応力が加わったときに、前記正極集電体、前記負極集電体、前記正極集電体と前記正極タブとの接続部、および前記負極集電体と前記負極タブとの接続部のいずれよりも先に破断するような強度を有する破断予定領域が、前記正極タブおよび前記負極タブの、前記外装体の外側に位置する所定の領域に設けられていること
    　を特徴とする電池。     A power generation element in which a positive electrode layer and a negative electrode layer are laminated so as to face each other with a separator interposed between the positive electrode layer and the positive electrode layer that is housed in an exterior body and is electrically connected to the positive electrode layer through a positive electrode current collector A negative electrode tab connected to the negative electrode layer through a negative electrode current collector is a battery having a structure drawn out of the exterior body,
    When a predetermined stress or more is applied to the positive electrode tab and / or the negative electrode tab, the positive electrode current collector, the negative electrode current collector, a connection portion between the positive electrode current collector and the positive electrode tab, and the negative electrode current collector An area to be broken having a strength that breaks before any of the connecting portions between the electric body and the negative electrode tab is provided in a predetermined area located outside the exterior body of the positive electrode tab and the negative electrode tab. A battery characterized by being characterized.
  2. 　前記正極タブおよび前記負極タブの前記破断予定領域が、前記正極タブを構成する部材どうし、および前記負極タブを構成する部材どうしを接合した接合部であることを特徴とする請求項１記載の電池。 2. The battery according to claim 1, wherein the planned fracture region of the positive electrode tab and the negative electrode tab is a joint portion joining the members constituting the positive electrode tab and the members constituting the negative electrode tab. .
  3. 　前記正極タブおよび前記負極タブの前記破断予定領域が、前記正極タブおよび前記負極タブに所定の加工を施して、前記破断予定領域以外の部分より破断強度を小さくした領域であることを特徴とする請求項１記載の電池。 The planned rupture regions of the positive electrode tab and the negative electrode tab are regions in which the positive electrode tab and the negative electrode tab are subjected to predetermined processing and the rupture strength is made smaller than a portion other than the planned rupture region. The battery according to claim 1.
  4. 　前記加工が、前記正極タブおよび前記負極タブに貫通孔、有底穴、溝、切り欠きからなる群より選ばれる少なくとも１種を設ける加工であることを特徴とする請求項３記載の電池。 4. The battery according to claim 3, wherein the process is a process of providing at least one selected from the group consisting of a through hole, a bottomed hole, a groove, and a notch in the positive electrode tab and the negative electrode tab.
  5. 　前記正極タブおよび前記負極タブが、湾曲部を備えており、かつ、前記湾曲部に前記破断予定領域が設けられていることを特徴とする請求項１～４のいずれかに記載の電池。 The battery according to any one of claims 1 to 4, wherein the positive electrode tab and the negative electrode tab include a curved portion, and the planned fracture region is provided in the curved portion.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106784509A (en) * 2017-03-10 2017-05-31 江苏索尔新能源科技股份有限公司 The battery component that a kind of battery core is longitudinally arranged
FR3056024A1 (en) * 2016-09-13 2018-03-16 Peugeot Citroen Automobiles Sa ELECTRIC ENERGY STORAGE CELL WITH WARMING IN THE EVENT OF WARMING
CN110600783A (en) * 2019-08-06 2019-12-20 松栢投资有限公司 Button battery and manufacturing method
CN111755657A (en) * 2019-03-29 2020-10-09 宁德新能源科技有限公司 Electrode assembly
CN112310562A (en) * 2020-04-03 2021-02-02 宁德时代新能源科技股份有限公司 Battery module, battery pack, device and failure processing method
CN114243227A (en) * 2021-12-02 2022-03-25 湖北省泰璞电子有限公司 Adjustable battery tab capable of being bent without damaging durability
CN115249876A (en) * 2021-04-27 2022-10-28 荣盛盟固利新能源科技有限公司 Battery tab and battery

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004039274A (en) * 2002-06-28 2004-02-05 Nissan Motor Co Ltd Electrode tab takeout part structure of laminated battery
JP2006164752A (en) * 2004-12-07 2006-06-22 Nissan Motor Co Ltd Battery structure
JP2009535777A (en) * 2006-05-01 2009-10-01 エルジー・ケム・リミテッド Secondary battery having an electrode with a self-cutting part that is disconnected when an overcurrent is applied
JP2011233385A (en) * 2010-04-28 2011-11-17 Nissan Motor Co Ltd Flat type battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004039274A (en) * 2002-06-28 2004-02-05 Nissan Motor Co Ltd Electrode tab takeout part structure of laminated battery
JP2006164752A (en) * 2004-12-07 2006-06-22 Nissan Motor Co Ltd Battery structure
JP2009535777A (en) * 2006-05-01 2009-10-01 エルジー・ケム・リミテッド Secondary battery having an electrode with a self-cutting part that is disconnected when an overcurrent is applied
JP2011233385A (en) * 2010-04-28 2011-11-17 Nissan Motor Co Ltd Flat type battery

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3056024A1 (en) * 2016-09-13 2018-03-16 Peugeot Citroen Automobiles Sa ELECTRIC ENERGY STORAGE CELL WITH WARMING IN THE EVENT OF WARMING
CN106784509A (en) * 2017-03-10 2017-05-31 江苏索尔新能源科技股份有限公司 The battery component that a kind of battery core is longitudinally arranged
CN111755657A (en) * 2019-03-29 2020-10-09 宁德新能源科技有限公司 Electrode assembly
US11646473B2 (en) 2019-03-29 2023-05-09 Ningde Amperex Technology Limited Electrode assembly
CN110600783A (en) * 2019-08-06 2019-12-20 松栢投资有限公司 Button battery and manufacturing method
CN110600783B (en) * 2019-08-06 2022-07-05 松栢投资有限公司 Button cell and manufacturing method
CN112310562A (en) * 2020-04-03 2021-02-02 宁德时代新能源科技股份有限公司 Battery module, battery pack, device and failure processing method
CN115249876A (en) * 2021-04-27 2022-10-28 荣盛盟固利新能源科技有限公司 Battery tab and battery
CN114243227A (en) * 2021-12-02 2022-03-25 湖北省泰璞电子有限公司 Adjustable battery tab capable of being bent without damaging durability
CN114243227B (en) * 2021-12-02 2023-11-24 湖北省泰璞电子有限公司 Adjustable battery tab capable of being bent and not damaging durability

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