TWI708416B - Power storage device - Google Patents

Power storage device Download PDF

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TWI708416B
TWI708416B TW105111253A TW105111253A TWI708416B TW I708416 B TWI708416 B TW I708416B TW 105111253 A TW105111253 A TW 105111253A TW 105111253 A TW105111253 A TW 105111253A TW I708416 B TWI708416 B TW I708416B
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metal foil
storage device
aforementioned
layer
power storage
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TW201639226A (en
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南谷廣治
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日商昭和電工包裝股份有限公司
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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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/121—Organic material
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • 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
    • 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
    • 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
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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

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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)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本發明係提供一種蓄電裝置，其特徵為其具備：裝置本體部60、及收容該裝置本體部之外裝體2張；且前述外裝體50，係具有金屬箔層2、12、及此金屬箔層之一側的面上所積層之熱融著性樹脂層4、14，並在前述金屬箔層之前述一側的面之一部分，設置未被前述熱融著性樹脂層覆蓋之導電部54、56；裝置本體部之正極61，係與前述一側的外裝體之導電部56電連接，裝置本體部之負極62，係與前述另一側的外裝體之導電部54電連接，正極及負極中至少一者之電極62，係藉由對於前述導電部54為接觸狀態而進行電連接。內壓上升時，原為接觸狀態之導電部54與電極62將會分離，可遮斷導通。 The present invention provides a power storage device, which is characterized by comprising: a device body 60 and two exterior bodies accommodating the device body; and the aforementioned exterior body 50 has metal foil layers 2, 12, and this The thermally fusible resin layers 4, 14 are laminated on one side of the metal foil layer, and a conductive part not covered by the thermally fusible resin layer is provided on a part of the metal foil layer on the one side. Parts 54 and 56; the positive electrode 61 of the main body of the device is electrically connected to the conductive part 56 of the external body on one side, and the negative electrode 62 of the main body of the device is electrically connected to the conductive part 54 of the external body on the other side. For connection, the electrode 62 of at least one of the positive electrode and the negative electrode is electrically connected by being in contact with the aforementioned conductive portion 54. When the internal pressure rises, the conductive portion 54 and the electrode 62 that were in contact will be separated and the conduction can be blocked.

Description

蓄電裝置 Power storage device

本發明係關於一種作為行動裝置用蓄電池、車載用蓄電池、再生能源回収用之蓄電池、電容器(蓄電器)等使用之蓄電裝置。 The present invention relates to a storage device used as a storage battery for mobile devices, a storage battery for vehicles, a storage battery for renewable energy recovery, a capacitor (storage device), etc.

又，本說明書及申請專利範圍中，「接觸」之詞，係意指蓄電裝置(電池等)中產生之氣體的積蓄使內壓上升，導致收容裝置本體部之外裝體向外膨脹時，電連接之該導電部及電極為可分離之狀態，因此，此「接觸」之詞，例如包含「黏著狀態」等，但不包含藉由接著劑之接合、藉由超音波之接合等的接合。 In addition, in this specification and the scope of the patent application, the term "contact" means that when the accumulation of gas generated in the power storage device (battery, etc.) causes the internal pressure to rise, causing the outer casing of the main body of the storage device to expand outward, The conductive part and electrode that are electrically connected are in a separable state. Therefore, the term "contact" includes, for example, "adhesive state", but does not include bonding by adhesives, bonding by ultrasonic waves, etc. .

鋰離子蓄電池，在例如：筆記型電腦、攝影機、手機、電動汽車等中被廣泛運用作為電源。此鋰離子蓄電池，係使用於電池本體部(包含正極、負極及電解質之本體部)之周圍以外殼包圍所構成者。此外殼用材料(外裝材)，例如將耐熱性樹脂薄膜所成外層、鋁箔層、熱可塑性樹脂薄膜所成內層，依此順序接著一體化之構成者已為習知技術。 Lithium-ion batteries are widely used as power sources in, for example, notebook computers, cameras, mobile phones, and electric vehicles. This lithium-ion battery is used around the battery body (the body including the positive electrode, the negative electrode and the electrolyte) and is constructed with a casing. The outer shell material (outer material), for example, an outer layer made of a heat-resistant resin film, an aluminum foil layer, and an inner layer made of a thermoplastic resin film, followed by integration in this order is a conventional technique.

然而，鋰離子蓄電池等，過充電時或過升溫時在電池本體部中容易產生氣體，因此氣體將緩緩積蓄在外裝材所包覆之內部空間內，有外裝材內部之內壓上升之情形。此內壓上升變大時將有外裝材破裂之疑 慮，故目前對於防止外裝材破裂之技術已有提案。 However, lithium ion batteries, etc., tend to generate gas in the battery body when overcharged or overheated. Therefore, the gas will slowly accumulate in the internal space covered by the exterior material, and the internal pressure inside the exterior material may increase. situation. When the internal pressure rises and becomes larger, there will be a suspicion that the exterior material will break Therefore, there have been proposals for technology to prevent cracking of exterior materials.

例如，專利文獻1，記載一種具有安全閥構成的電池之安全機構，其係將2張層壓片材互相重合所成之成形片材的各外周緣部相互接合所成外裝外殼之內部，收容發電要素及電解液而構成之層壓電池之安全機構；在前述外裝外殼上設置連通此內部並從一側邊部向外側突出之突出部，且前述安全閥具有排氣孔及閥體，排氣孔係由前述突出部2張中至少一者的前述成形片材所形成，而閥體係與此排氣孔之孔緣部可彈性壓接並可使前述排氣孔密閉者。 For example, Patent Document 1 describes a safety mechanism for a battery composed of a safety valve, in which the outer peripheral edges of a formed sheet formed by overlapping two laminated sheets are joined together to form the inside of an outer casing. A safety mechanism for a laminated battery composed of accommodating power generation elements and electrolyte; a protruding part communicating with the inside and protruding from one side to the outside is provided on the outer casing, and the safety valve has an exhaust hole and a valve body The vent hole is formed by the formed sheet of at least one of the two protruding parts, and the valve system and the edge of the vent hole can be elastically press-contacted and the vent hole can be sealed.

【先前技術文獻】【Prior Technical Literature】 【專利文獻】【Patent Literature】

【專利文獻1】日本特開2007-157678號公報 [Patent Document 1] JP 2007-157678 A

然而，如上述之先前技術，為了使外裝體內部所產生之氣體能向外裝體外部洩漏而設置安全閥機構時，必須進行設置此安全閥機構之新的步驟，如此將使製造步驟複雜化，有生產性降低之問題。 However, as in the above-mentioned prior art, when a safety valve mechanism is installed in order to allow the gas generated inside the outer body to leak to the outside of the outer body, a new step of installing the safety valve mechanism must be performed, which will complicate the manufacturing steps. There is a problem of reduced productivity.

本發明鑒於上述之技術背景，目的在於提供一種蓄電裝置，其在氣體的產生使內壓上升時，可遮斷外裝體之導電部(金屬箔露出部)與裝置本體部之電極的導通，從而可防止內壓更加上升以致外裝體的破裂。 In view of the above-mentioned technical background, the present invention aims to provide a power storage device that can interrupt the conduction between the conductive portion (metal foil exposed portion) of the exterior body and the electrode of the device body when the internal pressure rises due to the generation of gas. Therefore, it is possible to prevent the internal pressure from rising further and the outer body from breaking.

上述先前技術，係藉由使產生之氣體，從具有排氣孔及閥體之安全閥向外部洩漏，從而防止內壓上升導致之外裝材的破裂。相對於此，本申請人，係發想於：當產生氣體的積蓄導致內壓上升時，可使導通遮斷者之構成，藉由如此之非導通狀態可抑制更多氣體產生、積蓄，從而防止外裝體的破裂。 The above-mentioned prior art is to make the generated gas leak to the outside from the safety valve having the exhaust hole and the valve body, thereby preventing the external packing material from rupturing due to the increase of the internal pressure. In contrast to this, the applicant has the idea that when the internal pressure rises due to the accumulation of the generated gas, the conduction can be interrupted by such a non-conducting state to suppress the generation and accumulation of more gas, thereby Prevent rupture of the exterior body.

為了達成前述目的，本發明提供以下技術手段。 In order to achieve the foregoing objective, the present invention provides the following technical means.

〔1〕一種蓄電裝置，其特徵為其係具備：裝置本體部、及收容該裝置本體部之外裝體2張；且前述外裝體，係具有金屬箔層、及在此金屬箔層之一側的面上所積層之熱融著性樹脂層，並在前述金屬箔層之前述一側的面之一部分，設置未被前述熱融著性樹脂層覆蓋之導電部；配置為個別之熱融著性樹脂層互相面向的前述2張外裝體之間的空間，收容前述裝置本體部，將前述2張之外裝體的周緣部之各熱融著性樹脂層相互接合而密封；前述裝置本體部之正極，係與前述一側的外裝體之導電部電連接，前述裝置本體部之負極，係與前述另一側的外裝體之導電部電連接，前述正極及負極中至少一者之電極，係藉由對於前述導電部為接觸狀態而進行前述電連接。 [1] A power storage device, characterized in that it is provided with: a device main body and two outer casings accommodating the device main body; and the aforementioned outer casing has a metal foil layer and a metal foil layer A thermally fusible resin layer is laminated on one side surface, and a conductive part not covered by the thermally fusible resin layer is provided on a part of the one side of the metal foil layer; the configuration is individual heat The space between the two outer casings where the fusible resin layers face each other contains the main body of the device, and the heat-fusible resin layers on the peripheral edges of the two outer casings are joined to each other to seal; The positive electrode of the main body of the device is electrically connected to the conductive portion of the outer casing on one side, the negative electrode of the main body portion of the device is electrically connected to the conductive portion of the outer casing on the other side, and at least one of the positive and negative electrodes is One of the electrodes is electrically connected by being in contact with the conductive portion.

〔2〕如前項1所記載之蓄電裝置，其中，前述外裝體，係進一步具備前述金屬箔層之另一側的面上所積層之耐熱性樹脂層，且在前 述金屬箔層之另一側的面之一部分，設置未被前述耐熱性樹脂層覆蓋之端子部。 [2] The electrical storage device described in the preceding paragraph 1, wherein the exterior body is further provided with a heat-resistant resin layer laminated on the other side of the metal foil layer, and A part of the other side of the metal foil layer is provided with a terminal portion not covered by the heat-resistant resin layer.

〔3〕如前項1或2項所記載之蓄電裝置，其中，前述外裝體，在包含藉由為前述接觸狀態電連接之導電部的區域中，形成有向前述裝置本體部側凹陷之凹陷部。 [3] The power storage device described in the preceding paragraph 1 or 2, wherein the outer casing includes a region including a conductive portion electrically connected by the contact state, and a recess recessed toward the device body portion is formed unit.

〔4〕如前項1~3中任1項所記載之蓄電裝置，其中，藉由為前述接觸狀態而電連接之前述導電部及電極，係通過藉由導電性組成物的塗佈形成之塗布層而成為互相接觸狀態。 [4] The electrical storage device described in any one of the preceding paragraphs 1 to 3, wherein the conductive portion and the electrode electrically connected by being in the contact state are coated by coating of a conductive composition The layers become in contact with each other.

〔5〕如前項1~4中任1項所記載之蓄電裝置，其中，收容前述裝置本體部之空間內的內壓係大氣壓以下者。 [5] The power storage device described in any one of the preceding paragraphs 1 to 4, wherein the internal pressure in the space accommodating the device body is below atmospheric pressure.

〔6〕如前項5所記載之蓄電裝置，其中，其係在較大氣壓為小之氣壓環境下，進行前述周緣部之各別熱融著性樹脂層的接合。 [6] The power storage device described in the preceding paragraph 5, wherein the bonding of the respective thermally fusible resin layers of the peripheral portion is performed in an environment where the atmospheric pressure is relatively large but small.

根據〔1〕之發明，其構成係正極及負極中至少一者的電極，藉由對於外裝體之導電部(金屬箔露出部)為接觸狀態而進行電連接，當充電時或放電時等，在從裝置本體部等產生氣體之情形中，氣體將在外裝體之間的收容空間中積蓄，使內壓上升，導致外裝體膨脹而使原為前述接觸狀態之導電部與電極分離(因導電部與電極成為非接觸狀態)而成為非導通狀態，因此可抑制更多氣體的產生、積蓄，從而可防止內壓上升所致之外裝體的破裂。 According to the invention of [1], the electrode constituted by at least one of the positive electrode and the negative electrode is electrically connected by contacting the conductive portion (metal foil exposed portion) of the exterior body when charging or discharging. In the case of generating gas from the main body of the device, etc., the gas will accumulate in the accommodation space between the exterior bodies, increasing the internal pressure, causing the exterior body to expand and separating the conductive parts and the electrodes in the aforementioned contact state ( Since the conductive portion and the electrode are in a non-contact state) and become a non-conducting state, the generation and accumulation of more gas can be suppressed, and the outer casing can be prevented from being broken due to an increase in internal pressure.

根據〔2〕之發明，因金屬箔層之另一側的面積層有耐熱性 樹脂層，(除了端子部)因此可充分確保絕緣性，並確保物理性的強度；且因在金屬箔層之另一側的面之一部分設置有未被覆耐熱性樹脂層之金屬露出部(端子部)，故可藉由此露出部(端子部)進行通電。 According to the invention of [2], the area layer on the other side of the metal foil layer has heat resistance The resin layer (except for the terminal part) can therefore ensure sufficient insulation and physical strength; and because a part of the other side of the metal foil layer is provided with a metal exposed part (terminal) that is not covered with a heat-resistant resin layer Part), so the exposed part (terminal part) can be energized.

根據〔3〕之發明，外裝體係在包含藉由與電極接觸而電連接之導電部的區域中，形成有向裝置本體部側(內側)凹陷之凹陷部，因此，產生氣體導致內壓上升時，前述凹陷部會膨脹而反轉為向外側突出之凸部，此凸部與裝置本體之間所形成之空間將***產生之氣體(氣體將積蓄於反轉之凸部與裝置本體部之間的空間)。此外，當氣體產生使內壓上升，導致外裝體之凹陷部膨脹而反轉為向外側突出之凸部，如此將使前述接觸狀態之導電部與電極分離(成為非接觸狀態)，成為非導通狀態，因此可抑制更多之氣體產生、積蓄，從而可防止內壓上升所致外裝體的破裂。 According to the invention of [3], the exterior system is formed with a recessed portion recessed toward the side (inside) of the main body of the device in the region including the conductive portion that is electrically connected by contact with the electrode. Therefore, gas is generated and the internal pressure rises. At this time, the aforementioned recessed portion will expand and invert into a convex portion protruding outward. The space formed between this convex portion and the device body will contain the generated gas (the gas will be accumulated in the inverted convex portion and the device body portion Space between). In addition, when the gas is generated, the internal pressure rises, causing the concave portion of the exterior body to expand and invert to a convex portion protruding outward. This separates the conductive portion in the contact state from the electrode (in a non-contact state) and becomes a non-contact state. The conduction state can suppress more gas generation and accumulation, thereby preventing the rupture of the exterior body caused by the increase in internal pressure.

根據〔4〕之發明，係通過(介有)藉由導電性組成物的塗佈形成之塗布層而確保導電部與電極為接觸狀態之構成，藉由該塗佈層於其間之存在可提高導電部與電極之密著性，從而可使呈該接觸狀態之導電部與電極的導通狀態進一步提升。 According to the invention of [4], it is a structure in which the conductive part and the electrode are in contact with the coating layer formed by coating the conductive composition, and the presence of the coating layer in between can improve The adhesion between the conductive part and the electrode can further improve the conduction state between the conductive part and the electrode in the contact state.

根據〔5〕及〔6〕之發明，因收容裝置本體部之空間內的內壓係大氣壓以下，故在接觸狀態下確保導通之該導電部與電極之間的導通狀態可進一步提升。 According to the inventions [5] and [6], since the internal pressure in the space of the main body portion of the accommodating device is below atmospheric pressure, the conduction state between the conductive portion and the electrode that ensure conduction in the contact state can be further improved.

1‧‧‧蓄電裝置 1.‧‧Power storage device

2‧‧‧第一金屬箔層 2‧‧‧The first metal foil layer

4‧‧‧第一熱融著性樹脂層 4‧‧‧The first hot melt resin layer

8‧‧‧第一耐熱性樹脂層 8‧‧‧The first heat-resistant resin layer

9‧‧‧正極端子部(金屬箔露出部) 9‧‧‧Positive terminal part (metal foil exposed part)

12‧‧‧第二金屬箔層 12‧‧‧Second metal foil layer

14‧‧‧第二熱融著性樹脂層 14‧‧‧Second hot melt resin layer

18‧‧‧第二耐熱性樹脂層 18‧‧‧Second heat-resistant resin layer

19‧‧‧負極端子部(金屬箔露出部) 19‧‧‧Negative terminal part (metal foil exposed part)

50‧‧‧外裝體 50‧‧‧Exterior body

54‧‧‧負極導電部(金屬箔露出部) 54‧‧‧Negative conductive part (metal foil exposed part)

56‧‧‧正極導電部(金屬箔露出部) 56‧‧‧Positive electrode conductive part (metal foil exposed part)

60‧‧‧裝置本體部 60‧‧‧Device body

61‧‧‧正極 61‧‧‧Positive

62‧‧‧負極 62‧‧‧Negative pole

71‧‧‧凹陷部 71‧‧‧Depression

75‧‧‧塗佈層 75‧‧‧Coating layer

81‧‧‧反轉之凸部 81‧‧‧Inverted convex part

【圖1】係表示本發明之蓄電裝置的一實施型態之斷面圖。 Fig. 1 is a cross-sectional view showing an embodiment of the power storage device of the present invention.

【圖2】係圖1之蓄電裝置的平面圖。 [Figure 2] is a plan view of the power storage device in Figure 1.

【圖3】係表示圖1之蓄電裝置中產生氣體使內壓上升導致外裝體膨脹，造成負極導電部與負極的導通被遮斷之狀態之斷面圖。 [Fig. 3] is a cross-sectional view showing a state in which gas is generated in the electricity storage device of Fig. 1 to increase the internal pressure, which causes the outer casing to expand, causing the conduction between the negative electrode conductive portion and the negative electrode to be blocked.

【圖4】係表示本發明之蓄電裝置的另一實施型態之斷面圖。 Fig. 4 is a cross-sectional view showing another embodiment of the power storage device of the present invention.

【圖5】係圖4之蓄電裝置的平面圖。 [Fig. 5] is a plan view of the power storage device in Fig. 4.

【圖6】係圖4之蓄電裝置中產生氣體使內壓上升導致外裝體之凹陷部膨脹而反轉為向外側突出之凸部，造成導電部與電極的導通被遮斷之狀態之斷面圖。 [Figure 6] Gas generated in the power storage device of Figure 4 causes the internal pressure to rise, causing the recessed portion of the exterior body to expand and invert into a convex portion protruding outward, causing the conduction between the conductive portion and the electrode to be interrupted.面图。 Face map.

【圖7】係表示本發明之蓄電裝置的另一其他實施型態之斷面圖。又，圖7之蓄電裝置的平面圖，與圖2相同；表示圖7之蓄電裝置產生氣體使內壓上升，導致外裝體膨脹，從而遮斷負極導電部與負極的導通之狀態的斷面圖，與圖3相同。 Fig. 7 is a cross-sectional view showing another embodiment of the power storage device of the present invention. In addition, the plan view of the electricity storage device in FIG. 7 is the same as that in FIG. 2; a cross-sectional view showing the state where the electricity storage device in FIG. 7 generates gas to increase the internal pressure, which causes the exterior body to expand, thereby blocking the conduction between the negative electrode conductive portion and the negative electrode , Same as Figure 3.

本發明之蓄電裝置1之一實施型態以圖1、2表示。此蓄電裝置1，係層壓外裝電池，其具備作為裝置本體部之裸電池60、收納該裸電池60之外裝外殼45。 An embodiment of the power storage device 1 of the present invention is shown in FIGS. 1 and 2. This power storage device 1 is a laminated exterior battery, and includes a bare cell 60 as a main body of the device, and an exterior case 45 accommodating the bare cell 60.

如圖1、2所示，外裝外殼45，係由本體51與蓋體55組合製成，該本體51係具有平面視角形之凹部52及由此凹部52之開口緣向外側延伸之凸緣53；該蓋體係與前述本體51之凸緣53之外周尺寸相同尺寸者。前述凹部52係形成為裸電池60之收納用空間。 As shown in Figures 1 and 2, the outer casing 45 is made by combining a main body 51 and a cover 55. The main body 51 has a concave portion 52 with a planar view angle and a flange extending outward from the opening edge of the concave portion 52 53; The cover system is the same size as the outer circumference of the flange 53 of the body 51. The aforementioned recess 52 is formed as a storage space for the bare cell 60.

前述本體51之構成材，係使用外裝體50，該外裝體50 係具備：第二金屬箔層12、及該第二金屬箔層12之一側的面(第一面)通過第2接著劑層(圖未表示)所積層之第二熱融著性樹脂層14、以及前述第二金屬箔層12之另一側的面(第二面)通過第1接著劑層(圖未表示)所積層之第二耐熱性樹脂層18。此外裝體50係在前述第二金屬箔層12之一側的面之一部分上，設置有未被前述第二熱融著性樹脂層及第2接著劑層覆蓋之負極導電部(金屬箔露出部)54。本實施型態，係在前述第二金屬箔層12之一側的面之中央部形成前述負極導電部54。此外，前述第二金屬箔層12之另一側的面之一部分，設置有前述第二耐熱性樹脂層及未被第1接著劑層覆蓋之負極端子部(金屬箔露出部)19。本實施型態，係在前述第二金屬箔層12之另一側的面之端部，形成前述負極端子部19。 The constituent material of the aforementioned main body 51 uses an exterior body 50, and the exterior body 50 It is equipped with: a second metal foil layer 12 and a second heat-meltable resin layer laminated on one side (first surface) of the second metal foil layer 12 through a second adhesive layer (not shown) 14. The other side (second side) of the aforementioned second metal foil layer 12 passes through the second heat-resistant resin layer 18 laminated by the first adhesive layer (not shown). The package body 50 is provided on a part of the surface on one side of the second metal foil layer 12, and is provided with a negative electrode conductive portion (metal foil exposed) that is not covered by the second heat-meltable resin layer and the second adhesive layer Department) 54. In this embodiment, the negative conductive portion 54 is formed in the center of one side of the second metal foil layer 12. In addition, a portion of the other side surface of the second metal foil layer 12 is provided with the second heat-resistant resin layer and the negative electrode terminal portion (metal foil exposed portion) 19 that is not covered by the first adhesive layer. In this embodiment, the negative terminal portion 19 is formed at the end of the other side of the second metal foil layer 12.

前述蓋體55之構成材，係使用外裝體50，該外裝體50係具備：第一金屬箔層2、及該第一金屬箔層2之一側的面(第一面)通過第2接著劑層(圖未表示)所積層之第一熱融著性樹脂層4、以及前述第一金屬箔層2之另一側的面(第二面)通過第1接著劑層(圖未表示)所積層之第一耐熱性樹脂層8。此外裝體50係在前述第一金屬箔層2之一側的面之一部分上，設置有未被前述第一熱融著性樹脂層及第2接著劑層覆蓋之正極導電部(金屬箔露出部)56。本實施型態，係在前述第一金屬箔層2之一側的面之中央部形成前述正極導電部56。前述第一金屬箔層2之另一側的面之一部分，設置有未被前述第一耐熱性樹脂層及第1接著劑層覆蓋之正極端子部(金屬箔露出部)9。本實施型態，係在前述第一金屬箔層2之另一側的面之端部，形成前述正極端子部9。 As the constituent material of the aforementioned lid body 55, an exterior body 50 is used. The exterior body 50 is provided with a first metal foil layer 2 and a surface (first surface) on one side of the first metal foil layer 2 passing through the 2 Adhesive layer (not shown in the figure), the laminated first heat-fusible resin layer 4 and the other side (second surface) of the aforementioned first metal foil layer 2 pass through the first adhesive layer (not shown in the figure) Shows) the first heat-resistant resin layer 8 laminated. The package body 50 is provided on a part of the surface on one side of the first metal foil layer 2 and is provided with a positive electrode conductive portion (the metal foil is exposed) that is not covered by the first heat-meltable resin layer and the second adhesive layer Department) 56. In this embodiment, the positive electrode conductive portion 56 is formed in the center of one side of the first metal foil layer 2. A portion of the other side of the first metal foil layer 2 is provided with a positive electrode terminal portion (metal foil exposed portion) 9 that is not covered by the first heat-resistant resin layer and the first adhesive layer. In this embodiment, the positive terminal portion 9 is formed on the end of the other side of the first metal foil layer 2.

前述本體51，係對於平面片材之前述外裝體進行鼓脹成行、絞伸成形等之成形而形成凹部52，將凹部52之周圍的未變形部分裁剪為凸緣53之外周尺寸者。另一方面，前述蓋體55係將平面片材之前述外裝體裁剪成所要尺寸而得者。前述本體51之凹部52的底部之內面設置有負極導電部54，蓋體55之內面設置有正極導電部56(參照圖1)。前述正極導電部56及負極導電部54，係藉由使外裝體50之金屬箔層2、12露出之露出部而形成。此外，前述正極端子部9及負極端子部19，係藉由使外裝體50之金屬箔層2、12露出之露出部而形成。 The main body 51 is formed by swelling and stranding the outer body of the flat sheet to form the recessed portion 52, and the undeformed portion around the recessed portion 52 is cut to the outer circumference of the flange 53. On the other hand, the cover body 55 is obtained by cutting the outer body of the plane sheet to a desired size. The inner surface of the bottom of the recess 52 of the main body 51 is provided with a negative electrode conductive portion 54 and the inner surface of the cover 55 is provided with a positive electrode conductive portion 56 (refer to FIG. 1). The aforementioned positive electrode conductive portion 56 and negative electrode conductive portion 54 are formed by exposing the metal foil layers 2 and 12 of the exterior body 50. In addition, the aforementioned positive electrode terminal portion 9 and negative electrode terminal portion 19 are formed by the exposed portions where the metal foil layers 2 and 12 of the exterior body 50 are exposed.

前述裸電池60，係將片狀之正極61與片狀之負極62介有隔板63積層所成，此裸電池60收容於前述2張外裝體50之間的空間。前述正極61之端部與外裝體50之正極導電部56藉由接合(超音波接合、焊接、藉由導電性接著劑的接著等)使正極61與正極導電部56電連接，藉由前述負極62之端部與外裝體50之負極導電部54成為接觸狀態，使負極62與負極導電部54電連接。本實施型態中，負極62之端部與負極導電部54的接觸，係面接觸者(參照圖1)。 The aforementioned bare cell 60 is formed by stacking a sheet-shaped positive electrode 61 and a sheet-shaped negative electrode 62 with a separator 63 interposed therebetween. The bare cell 60 is housed in the space between the two outer casings 50. The end of the aforementioned positive electrode 61 and the positive electrode conductive portion 56 of the exterior body 50 are electrically connected to the positive electrode 61 and the positive electrode conductive portion 56 by joining (ultrasonic bonding, welding, bonding by a conductive adhesive, etc.). The end of the negative electrode 62 is in contact with the negative electrode conductive portion 54 of the exterior body 50, and the negative electrode 62 and the negative electrode conductive portion 54 are electrically connected. In this embodiment, the contact between the end of the negative electrode 62 and the negative electrode conductive portion 54 is a surface contact (refer to FIG. 1).

前述蓄電裝置1，係將裸電池60收納至本體51之凹部52並被覆蓋體55，留下電解液注入口將本體51之凸緣53與蓋體55間的接觸部之各熱融著性樹脂層4、14相互熱密封而密封者，注入電解液後將前述電解液注入口熱密封而得密封者。本實施型態，係在較大氣壓為小之氣壓環境下進行前述各熱融著性樹脂層4、14的相互接合，所得蓄電裝置1，其收容裝置本體部60之空間內的內壓，將成為與大氣壓相同或較大氣壓為小，藉此，負極62之端部與負極導電部54的接觸將成 為面接觸。藉由成為如此之面接觸可確保負極62之端部與負極導電部54之間有充分之導通。 In the aforementioned power storage device 1, the bare cell 60 is housed in the recess 52 of the main body 51 and covered by the body 55, and the electrolyte injection port is left, and the contact parts between the flange 53 of the main body 51 and the lid 55 are thermally fused. The resin layers 4 and 14 are heat-sealed and sealed to each other, and the electrolyte injection port is heat-sealed after injecting the electrolyte to obtain the sealing. In this embodiment, the aforementioned thermally fusible resin layers 4, 14 are joined to each other in an environment where the atmospheric pressure is relatively large and the atmospheric pressure is small. The resulting electrical storage device 1 has the internal pressure in the space containing the device body 60 as The pressure becomes the same as the atmospheric pressure or the larger pressure is lower, whereby the end of the negative electrode 62 and the negative electrode conductive part 54 are in contact with each other. For surface contact. By making such a surface contact, sufficient conduction between the end of the negative electrode 62 and the negative electrode conductive portion 54 can be ensured.

上述蓄電裝置1，由於係在外裝體50設置有正極端子部9及負極端子部19，故可藉由此等端子部9、19而與其他機器連接為可通電。此外，由於連接裸電池(裝置本體部)之導電部(金屬箔層)係作為外裝體之一部分而形成者，故不須使用接片即可通電。藉由不使用接片，可實現蓄電裝置的輕量化及小型化。 Since the above-mentioned power storage device 1 is provided with the positive terminal portion 9 and the negative terminal portion 19 in the exterior body 50, the terminal portions 9 and 19 can be connected to other devices so as to be energized. In addition, since the conductive portion (metal foil layer) connecting the bare cell (device body) is formed as a part of the exterior body, it can be energized without using a tab. By not using tabs, the weight and size of the power storage device can be reduced.

此外，由於上述蓄電裝置1之構成，係正極61之端部與正極導電部56接合，而負極62之端部與負極導電部54(未接合)面接觸，故在充電時或放電時等，若發生從裝置本體部等產生氣體之情形，氣體積蓄導致外裝外殼45內之內壓上升時，為前述接觸狀態之負極導電部54與負極62將會分離，成為互相非接觸狀態(參照圖3)，成為非導通狀態，因此可抑制更多之氣體產生、積蓄，從而防止內壓上升所致外裝體50的破裂。又，因正極61之端部與正極導電部56接合，故外裝外殼45內之內壓上升時，正極61之端部與正極導電部56亦不會分離(參照圖3)。 In addition, due to the structure of the above-mentioned power storage device 1, the end of the positive electrode 61 is joined to the positive electrode conductive portion 56, and the end of the negative electrode 62 is in surface contact with the negative electrode conductive portion 54 (unjoined), so during charging or discharging, etc. If gas is generated from the body of the device, etc., when the internal pressure in the outer casing 45 rises due to the accumulation of gas, the negative electrode conductive portion 54 and the negative electrode 62 in the aforementioned contact state will be separated and become non-contact with each other (see figure) 3) It becomes a non-conducting state, so that more gas generation and accumulation can be suppressed, and the rupture of the exterior body 50 caused by the increase in internal pressure can be prevented. In addition, since the end of the positive electrode 61 is joined to the positive electrode conductive portion 56, when the internal pressure in the outer casing 45 rises, the end of the positive electrode 61 and the positive electrode conductive portion 56 will not separate (see FIG. 3).

又，雖然上述實施型態採用之構成，係正極61與正極導電部56接合，而負極62與負極導電部54為接觸狀態者，但並不特別限定為此構成，例如，亦可採用負極62與負極導電部54接合，而正極61與正極導電部56為接觸狀態之構成，抑或，採用正極61與正極導電部56為接觸狀態，同時負極62與負極導電部54亦為接觸狀態之構成。任一者構成，在氣體積蓄導致外裝外殼45內之內壓上升時，可使原 為接觸狀態之電極與導電部分離，成為非導通狀態，從而抑制更多之氣體產生、積蓄，防止外裝體的破裂。 In addition, although the above-mentioned embodiment adopts a configuration in which the positive electrode 61 is joined to the positive electrode conductive portion 56 and the negative electrode 62 and the negative electrode conductive portion 54 are in contact, this configuration is not particularly limited. For example, the negative electrode 62 may also be used. It is joined to the negative electrode conductive portion 54 and the positive electrode 61 and the positive electrode conductive portion 56 are in contact, or the positive electrode 61 and the positive electrode conductive portion 56 are in contact, and the negative electrode 62 and the negative electrode conductive portion 54 are also in contact. Either configuration, when the gas accumulation causes the internal pressure in the outer casing 45 to rise, the original The electrode in the contact state is separated from the conductive part and becomes a non-conducting state, thereby suppressing more gas generation and accumulation, and preventing the outer casing from breaking.

接著，本發明之蓄電裝置1之其他實施型態以圖4、5表示。本實施型態，係採用正極61與正極導電部56為面接觸狀態，負極62與負極導電部54為面接觸狀態之構成。此外，在本體51(外裝體50)中含有負極導電部54之區域，形成有向裝置本體部60側凹陷之凹陷部71，且在蓋體55(外裝體50)中含有正極導電部56之區域，形成有向裝置本體部60側凹陷之凹陷部71。本實施型態中，前述凹陷部71之平面視形狀係圓形狀者(參照圖5)。前述凹陷部71，可藉由進行鼓脹成形、絞伸成形等之成形而形成。除了上述之構成以外，其他皆與前述實施型態(圖1、2)相同，故省略說明。 Next, other embodiments of the power storage device 1 of the present invention are shown in FIGS. 4 and 5. In this embodiment, the positive electrode 61 and the positive electrode conductive portion 56 are in surface contact, and the negative electrode 62 and the negative electrode conductive portion 54 are in surface contact. In addition, the area containing the negative electrode conductive portion 54 in the main body 51 (outer body 50) is formed with a recessed portion 71 that is recessed toward the device main body 60 side, and the cover 55 (outer body 50) contains the positive electrode conductive portion The area of 56 is formed with a recessed portion 71 that is recessed toward the side of the device body portion 60. In this embodiment, the shape of the depression 71 in plan view is a round shape (refer to FIG. 5). The aforementioned recessed portion 71 can be formed by performing bulging forming, strand forming, or the like. Except for the above configuration, the others are the same as the foregoing embodiment (FIGS. 1 and 2), so the description is omitted.

圖4、5所示蓄電裝置1，係採用正極61與正極導電部56為面接觸狀態，負極62與負極導電部54為面接觸狀態之構成，當氣體產生使內壓上升時，前述凹陷部71，上下皆如圖6所示，向外側膨脹，反轉為向外側突出之凸部81，此凸部81與裝置本體部60之間形成的空間82收容產生氣體(反轉之凸部81與裝置本體部60之間的空間成為氣體積蓄空間82)。此外，藉由氣體產生使內壓上升導致外裝體50之凹陷部71膨脹，反轉為向外側突出之凸部81，如圖6所示，原為前述接觸狀態之導電部54、56與電極62、61將分離(成為非接觸狀態)，成為非導通狀態，因此可抑制更多之氣體產生、積蓄，從而防止內壓上升所致外裝體50的破裂。 The power storage device 1 shown in FIGS. 4 and 5 adopts a configuration in which the positive electrode 61 and the positive electrode conductive portion 56 are in surface contact, and the negative electrode 62 and the negative electrode conductive portion 54 are in surface contact. When the gas is generated, the internal pressure rises, the aforementioned recessed portion 71. As shown in Fig. 6, the upper and lower parts are expanded outwardly and inverted into a convex portion 81 protruding to the outside. The space 82 formed between the convex portion 81 and the device body 60 contains the generated gas (reverse convex portion 81 The space between the device body 60 and the device body 60 becomes the gas storage space 82). In addition, the increase in internal pressure caused by gas generation causes the recessed portion 71 of the exterior body 50 to expand and reverse to a convex portion 81 protruding to the outside. As shown in FIG. 6, the conductive portions 54 and 56 and The electrodes 62 and 61 will separate (be in a non-contact state) and become a non-conducting state. Therefore, more gas generation and accumulation can be suppressed, thereby preventing the outer casing 50 from cracking due to an increase in internal pressure.

形成前述凹陷部71之側面，較佳係形成為從該凹陷部71 之底面向凹陷部71之開口部傾斜、凹陷部71之內側向外側傾斜之傾斜面(參照圖4)。亦即，圖4中，凹陷部71之底面與側面所成角度α，設定在較90度大為佳，其中，設定在100°≦α≦160°之範圍更佳，特佳係設定在120°≦α≦150°之範圍。前述角度α設定為較90度大之情形中，因氣體的產生、積蓄而導致內壓上升時，前述凹陷部71較容易反轉為向外側突出之凸部81。 The side surface forming the aforementioned recessed portion 71 is preferably formed from the recessed portion 71 The bottom faces the inclined surface where the opening of the recessed portion 71 is inclined, and the inside of the recessed portion 71 is inclined to the outside (refer to FIG. 4). That is, in FIG. 4, the angle α formed between the bottom surface and the side surface of the recessed portion 71 is preferably set to be larger than 90 degrees, wherein the range of 100°≦α≦160° is more preferable, and the range of 120° is particularly preferable. °≦α≦150°range. When the aforementioned angle α is set to be larger than 90 degrees, when the internal pressure rises due to the generation and accumulation of gas, the aforementioned recessed portion 71 is more likely to be reversed into a convex portion 81 protruding outward.

前述凹陷部71之平面視形狀，並無特別限定，例如，除了略圓形狀、略橢圓形狀之外，可列舉四角形形狀、六角形形狀等之多角形形狀等。其中，前述凹陷部71之平面視形狀，係略圓形狀或略橢圓形狀為佳。其係略圓形狀或略橢圓形狀之情形中，因氣體的產生、積蓄而導致內壓上升時，前述凹陷部71較容易反轉為向外側突出之凸部81。 The shape of the recess 71 in plan view is not particularly limited. For example, in addition to a substantially round shape and a substantially elliptical shape, polygonal shapes such as a quadrangular shape and a hexagonal shape may be mentioned. Among them, the shape of the depression 71 in plan view is preferably a slightly round shape or a slightly elliptical shape. In the case of a substantially round shape or a substantially elliptical shape, when the internal pressure rises due to the generation and accumulation of gas, the recessed portion 71 is easily reversed to the convex portion 81 protruding outward.

前述凹陷部71之深度，設定在0．5mm~2mm為佳。若為0．5mm以上，可充分確保以反轉之凸部81所形成之氣體積蓄部之空間，且因產生氣體的積蓄導致凹陷部71膨脹，反轉為向外側突出之凸部81時，原為接觸狀態之導電部與電極可確實分離，從而可確實確保內壓上升時導通的遮斷(非導通狀態)。此外，藉由為2mm以下，則可實現蓄電裝置的薄型化、省空間化。 The depth of the aforementioned recessed portion 71 is preferably set to 0.5 mm to 2 mm. If it is 0.5 mm or more, the space for the gas volume accumulation portion formed by the inverted convex portion 81 can be sufficiently ensured, and the recessed portion 71 expands due to the accumulation of generated gas and is inverted to the convex portion 81 protruding outward, The conductive part and the electrode in the contact state can be reliably separated, so that the interruption of conduction (non-conduction state) when the internal pressure rises can be ensured. In addition, by being 2 mm or less, the power storage device can be thinned and space-saving.

本發明中，正極導電部(金屬箔露出部)56的形成，可根據以下所述進行。前述第一金屬箔層2之一側的面(第一面)通過第2接著劑層(圖未表示)與第一熱融著性樹脂層4貼合。此時，在對應正極導電部(金屬箔露出部)部分以外的區域塗佈構成第2接著劑層之接著劑，對應正極導電部(金屬箔露出部)之區域不塗佈接著劑。在形成如此之接 著劑未塗佈區域的狀態下，將第一金屬箔層2與第一熱融著性樹脂層4貼合。接著劑，塗佈在第一金屬箔層2及第一熱融著性樹脂層4之貼合面中任一者皆可。 In the present invention, the formation of the positive electrode conductive portion (metal foil exposed portion) 56 can be performed as described below. The surface (first surface) on one side of the first metal foil layer 2 is bonded to the first thermally fusible resin layer 4 via a second adhesive layer (not shown). At this time, the adhesive constituting the second adhesive layer was applied to the area other than the portion corresponding to the positive electrode conductive portion (metal foil exposed portion), and the adhesive was not applied to the area corresponding to the positive electrode conductive portion (metal foil exposed portion). In forming such a connection In the state where the adhesive is not applied to the region, the first metal foil layer 2 and the first thermally fusible resin layer 4 are bonded together. The adhesive may be applied to any one of the bonding surfaces of the first metal foil layer 2 and the first heat-meltable resin layer 4.

接著，藉由去除接著劑未塗佈區域中的第一熱融著性樹脂層4，形成金屬箔露出部(正極導電部)56。例如，以雷射照射第一熱融著性樹脂層4上接著劑未塗佈區域之周緣，切斷去除第一熱融著性樹脂層，從而形成金屬箔露出部(正極導電部)56。前述雷射之種類並無特別限定，可列舉例如，YAG雷射所代表之固體雷射、二氧化碳雷射所代表之氣體雷射等。 Next, by removing the first thermally fusible resin layer 4 in the region where the adhesive is not applied, the metal foil exposed portion (positive electrode conductive portion) 56 is formed. For example, by irradiating the periphery of the adhesive uncoated area on the first thermally fusible resin layer 4 with a laser, the first thermally fusible resin layer is cut and removed, thereby forming the metal foil exposed portion (positive electrode conductive portion) 56. The type of the aforementioned laser is not particularly limited, and examples include solid lasers represented by YAG lasers and gas lasers represented by carbon dioxide lasers.

前述負極導電部(金屬箔露出部)54的形成、正極端子部(金屬箔露出部)9的形成及負極端子部(金屬箔露出部)19的形成，亦可藉由與上述正極導電部(金屬箔露出部)56之形成手段相同之手段進行。 The formation of the aforementioned negative electrode conductive portion (metal foil exposed portion) 54, the formation of the positive terminal portion (metal foil exposed portion) 9, and the formation of the negative terminal portion (metal foil exposed portion) 19 may also be combined with the positive electrode conductive portion ( The metal foil exposed portion) 56 is formed by the same method.

又，上述金屬露出部9、19、54、56之形成手段，僅為其中一例表示者，並無限定為此手段。 In addition, the above-mentioned forming means of the metal exposed portions 9, 19, 54, 56 is only an example, and is not limited to this means.

本發明中，採用前述電極與前述導電部等為接觸狀態而互相電連接之構成時，該電極與該導電部，係通過藉由導電性組成物的塗布而形成之塗佈層75而為互相接觸狀態(面接觸狀態為特佳)之構成為佳(參照圖7)。藉由如此之塗佈層75介在相互間可提高導電部與電極之密著性，因此為接觸狀態之導電部與電極之導通狀態可進一步提升。前述塗佈層75，係在電極及導電部中至少任一者塗佈前述組成物而形成。圖7中，塗佈層75係塗佈在導電部(金屬箔露出部)之一部分上而形成，惟亦可 採用在導電部(金屬箔露出部)之整面上塗佈之構成。 In the present invention, when the electrode and the conductive portion are in contact with each other and are electrically connected to each other, the electrode and the conductive portion are mutually connected by the coating layer 75 formed by coating the conductive composition. The configuration of the contact state (surface contact state is particularly good) is good (refer to FIG. 7). By interposing the coating layer 75 in this way, the adhesion between the conductive part and the electrode can be improved, and therefore the conduction state of the conductive part and the electrode in contact can be further improved. The coating layer 75 is formed by coating the aforementioned composition on at least any one of the electrode and the conductive portion. In FIG. 7, the coating layer 75 is formed by coating a part of the conductive part (metal foil exposed part), but it can also be It adopts the structure of coating the whole surface of the conductive part (metal foil exposed part).

為了形成前述塗佈層75之導電性組成物，雖無特別限定，但可例如，以含有結著劑(接著劑)及導電助材之組成物作為例示。前述結著劑，雖無特別限定，但可列舉例如，PVDF(聚偏二氟乙烯)、SBR(丁苯橡膠)、CMC(羧甲基纖維素鈉鹽)、PAN(聚丙烯腈)、直鏈型多醣類等。此外，前述導電助材，雖無特別限定，但可列舉例如，CB(碳黑)、CNT(碳奈米管)等。通常，將接著劑以每一接著劑所適用之溶劑將其溶解後塗工，藉由乾燥步驟將溶劑去除而形成前述塗佈層75即可。進行乾燥使不殘留前述溶劑較合適。前述組成物之塗布方法，雖無特別限定，但可列舉例如，凹版塗佈法等。前述塗佈層75之厚度，係設定在10μm~50μm為佳。導電部與電極接觸時在互相間介在如此之塗佈層75之情形中，產生氣體導致外裝外殼45內之內壓上升時，外裝體膨脹，通過塗佈層而為接觸狀態之導電部與電極將會分離成為互相非接觸狀態，遮斷導通。 Although the conductive composition for forming the coating layer 75 is not particularly limited, for example, a composition containing a binding agent (adhesive) and a conductive auxiliary material can be exemplified. The aforementioned binding agent is not particularly limited, but for example, PVDF (polyvinylidene fluoride), SBR (styrene butadiene rubber), CMC (carboxymethyl cellulose sodium salt), PAN (polyacrylonitrile), straight Chain polysaccharides, etc. In addition, although the aforementioned conductive auxiliary material is not particularly limited, for example, CB (carbon black), CNT (carbon nanotube), etc. can be cited. Generally, the adhesive is dissolved in a solvent suitable for each adhesive and then coated, and the solvent is removed by a drying step to form the aforementioned coating layer 75. It is suitable to dry so that the aforementioned solvent does not remain. Although the coating method of the said composition is not specifically limited, for example, a gravure coating method etc. are mentioned. The thickness of the aforementioned coating layer 75 is preferably set at 10 μm-50 μm. When the conductive part and the electrode are in contact with each other in such a coating layer 75, when gas is generated and the internal pressure in the outer casing 45 rises, the outer casing expands and becomes the conductive part in contact with the coating layer. The electrode will be separated into a non-contact state, blocking conduction.

本發明中，裝置本體部60係在較大氣壓小之環境下被收容，並接合密封外裝體之各周緣部為佳。藉由如此之構成，可使收容部(凹部)52之空間縮小，此外在収容部52之空間成為與裝置本體部60相同體積後，為了維持収容空間內之內壓在大氣壓以下，對於外裝體一直從外部向內施壓(向內側)，藉此可提高為接觸狀態之電極與導電部之密著性，使其成為充分接觸之面接觸，從而確保充分之導通。成為如此之構成，例如，前述2張外裝體之周緣部的各熱融著性樹脂層的相互接合，在0．002MPa(2KPa)以下之環境進行為佳，0．001MPa(1 KPa)以下之環境進行更佳。因此，收容有前述裝置本體部60之空間內的內壓係較0．01MPa(10KPa)為小之構成為佳，進一步設定在1KPa~10KPa之範圍特佳。 In the present invention, the main body part 60 of the device is accommodated in an environment with a relatively large air pressure and is preferably joined with the peripheral parts of the sealed exterior body. With this configuration, the space of the receiving portion (recessed portion) 52 can be reduced. In addition, after the space of the receiving portion 52 becomes the same volume as the device main body 60, in order to maintain the internal pressure in the receiving space below the atmospheric pressure, it is necessary for the exterior The body is always pressed from the outside to the inside (to the inside), which can improve the adhesion between the electrode and the conductive part in the contact state, and make it come into full contact surface contact, thereby ensuring sufficient conduction. With such a configuration, for example, the mutual bonding of the thermally fusible resin layers at the peripheral edge of the two outer casings is preferably performed in an environment of 0.002 MPa (2KPa) or less, 0.001 MPa (1 KPa) The following environment is better. Therefore, the internal pressure in the space accommodating the aforementioned device main body 60 is preferably configured to be smaller than 0.01 MPa (10KPa), and it is particularly preferable to set it in the range of 1KPa to 10KPa.

又，上述實施型態，雖然係作為裝置本體部60之一例之裸電池，以捲繞型作為例示，但並非特別限定為如此之構成，例如，亦可為正極/隔板/負極所成3層積層構造(非捲繞型)。 In addition, although the above-mentioned embodiment is a bare cell as an example of the device main body 60, a wound type is exemplified, but it is not particularly limited to such a configuration. For example, it may be composed of positive electrode/separator/negative electrode. Laminated layer structure (non-wound type).

此外，上述實施型態，雖然係在一方的外裝體50形成凹部52，但該凹部52的形成，並非本發明必要之構成，亦可採用未在兩方之外裝體50設置凹部之構成而在此一對之外裝體50之間的空間收容裝置本體部60並密封外裝體50之各周緣部之構成。 In addition, in the above embodiment, although the recessed portion 52 is formed on one of the exterior bodies 50, the formation of the recessed portion 52 is not an essential structure of the present invention. A configuration in which the recessed portions are not provided on both exterior bodies 50 can also be adopted. The space between the pair of exterior bodies 50 accommodates the device body 60 and seals each peripheral portion of the exterior body 50.

本發明中，構成前述外裝體50之各層的材料，只要可作為蓄電裝置之外裝材使用，則可使用任意之材料。較佳材料如以下所述。 In the present invention, any material constituting each layer of the aforementioned exterior body 50 can be used as long as it can be used as an exterior material of the electrical storage device. Preferred materials are as described below.

(耐熱性樹脂層) (Heat-resistant resin layer)

構成前述第一、二耐熱性樹脂層(外側層)8、18的耐熱性樹脂層，係使用不會因熱密封外裝材時之熱密封溫度而溶融之耐熱性樹脂。前述耐熱性樹脂，係使用具有較構成熱融著性樹脂層之熱融著性樹脂之熔點高10℃以上之高熔點的耐熱性樹脂為佳，使用具有較熱融著性樹脂之融點高20℃以上之高熔點的耐熱性樹脂為特佳。 The heat-resistant resin layers constituting the first and second heat-resistant resin layers (outer layers) 8 and 18 are heat-resistant resins that do not melt due to the heat-sealing temperature when heat-sealing the exterior material. The aforementioned heat-resistant resin is preferably a heat-resistant resin with a high melting point 10°C or more higher than the melting point of the heat-fusible resin constituting the heat-fusible resin layer, and a resin with a higher melting point is used. A heat-resistant resin with a high melting point above 20°C is particularly preferred.

前述第一、二耐熱性樹脂層8、18，可列舉例如，聚醯胺薄膜、聚酯薄膜等，使用此等之延伸薄膜較佳。其中，根據成形性及強度之觀點，二軸延伸聚醯胺薄膜或二軸延伸聚酯薄膜、或者含有此等之複層薄膜為特佳，進一步使用二軸延伸聚醯胺薄膜與二軸延伸聚酯薄膜貼合之 複數層薄膜為更佳。前述聚醯胺薄膜，雖無特別限定，但可列舉例如6尼龍薄膜、6，6尼龍薄膜、MXD尼龍薄膜等。此外，二軸延伸聚酯薄膜，可列舉出二軸延伸聚對苯二甲酸丁二醇酯(PBT)膜、二軸延伸聚對苯二甲酸乙二醇酯(PET)膜等。 The first and second heat-resistant resin layers 8 and 18 include, for example, polyamide films, polyester films, etc., and stretched films of these are preferably used. Among them, from the viewpoint of formability and strength, a biaxially stretched polyamide film or a biaxially stretched polyester film, or a multi-layer film containing these is particularly preferred. Further, a biaxially stretched polyamide film and a biaxially stretched film are used. Laminated with polyester film Multiple layers of films are more preferable. The aforementioned polyamide film is not particularly limited, but examples thereof include 6 nylon film, 6,6 nylon film, and MXD nylon film. In addition, the biaxially stretched polyester film includes a biaxially stretched polybutylene terephthalate (PBT) film, a biaxially stretched polyethylene terephthalate (PET) film, and the like.

此外，為了提升前述第一、二耐熱性樹脂層8、18之表面的平滑性以使其與成形用模具間之滑動性提高，配合平滑劑及/或固體微粒子亦佳。 In addition, in order to improve the smoothness of the surfaces of the first and second heat-resistant resin layers 8 and 18 so as to improve the sliding properties between the mold and the molding die, a smoothing agent and/or solid particles may also be added.

前述第一、二耐熱性樹脂層8、18之厚度，任一者皆係9μm~50μm為佳。設定在前述合適下限值以上，可確保作為包裝材具有充分之強度，且設定在前述合適上限值以下，可減少成形時之應力而提高成形性。 The thickness of the aforementioned first and second heat-resistant resin layers 8, 18 is preferably 9 μm to 50 μm. Setting it above the appropriate lower limit can ensure sufficient strength as a packaging material, and setting it below the appropriate upper limit can reduce the stress during forming and improve the formability.

(熱融著性樹脂層) (Heat fusible resin layer)

內側層之第一、二熱融著性樹脂層4、14係具備對於使用於鋰離子二次電池等之腐蝕性強的電解液等優異之耐藥品性，同時擔任賦予外裝材熱密封性之角色。 The first and second thermally fusible resin layers 4 and 14 of the inner layer have excellent chemical resistance to corrosive electrolytes used in lithium ion secondary batteries, etc., and also serve to impart heat sealability to exterior materials The role.

前述第一、二熱融著性樹脂層4、14，較佳係熱可塑性樹脂未延伸薄膜。前述熱可塑性樹脂未延伸薄膜，雖無特別限定，但根據耐藥品性及熱密封性之觀點，以聚乙烯、聚丙烯、烯烴系共聚物、此等之酸變性物及離聚物所構成為佳。此外，烯烴系共聚物，可例示如EVA(乙烯‧乙酸乙烯酯共聚物)、EAA(乙烯‧丙烯酸共聚物)、EMMA(乙烯‧甲基丙烯酸酯共聚物)。此外，亦可使用聚醯胺薄膜(例如12尼龍)或聚醯亞胺膜。 The aforementioned first and second thermally fusible resin layers 4 and 14 are preferably non-stretched films of thermoplastic resin. The aforementioned thermoplastic resin unstretched film is not particularly limited, but from the viewpoint of chemical resistance and heat sealability, it is composed of polyethylene, polypropylene, olefin copolymers, these acid-denatured products, and ionomers. good. In addition, examples of olefin-based copolymers include EVA (ethylene·vinyl acetate copolymer), EAA (ethylene·acrylic acid copolymer), and EMMA (ethylene·methacrylate copolymer). In addition, a polyimide film (for example, 12 nylon) or a polyimide film may also be used.

前述第一、二熱融著性樹脂層4、14亦與前述耐熱性樹脂層相同，為了提高表面之平滑性，而配合平滑劑及/或固體微粒子為佳。 The first and second heat-fusible resin layers 4 and 14 are also the same as the heat-resistant resin layers. In order to improve the smoothness of the surface, a smoothing agent and/or solid particles are preferably added.

前述第一、二熱融著性樹脂層4、14之厚度，任一者較佳係設定為20μm~80μm。20μm以上時，可充分確保絕緣性，藉由設定為80μm以下，可降低樹脂使用量實現降低成本。其中，前述第一、二熱融著性樹脂層4、14之厚度，任一者皆設定在20μm~50μm特佳。又，前述第一、二熱融著性樹脂層，可為單層亦可為複層。複層薄膜，可以在嵌段聚丙烯薄膜之兩面積層無規聚丙烯薄膜而成三層薄膜為例示。 The thickness of the first and second thermally fusible resin layers 4 and 14 is preferably set to 20 μm to 80 μm. When it is 20μm or more, sufficient insulation can be ensured. By setting it to 80μm or less, the amount of resin used can be reduced to reduce costs. Among them, the thickness of the aforementioned first and second thermally fusible resin layers 4, 14 is particularly preferably set at 20 μm to 50 μm. In addition, the aforementioned first and second thermally fusible resin layers may be a single layer or a multiple layer. For the multi-layer film, a three-layer film can be formed by layering random polypropylene films on two areas of a block polypropylene film.

(金屬箔層) (Metal foil layer)

前述第一、二金屬箔層2、12，係擔任賦予層壓外裝體50阻止氧或水分之侵入之氣體阻隔性之角色。前述第一、二金屬箔層2、12，將金屬箔露出部作為導電部時，係使用導電性良好之金屬箔。可列舉例如，鋁箔、銅箔、鎳箔、不鏽鋼箔、或者此等之包覆箔、此等之燒鈍箔或未燒鈍箔。此外，亦可較佳使用鍍覆有鎳、錫、銅、鉻等之導電性金屬的金屬箔，例如鍍覆鋁箔。前述導電性鍍覆皮膜至少形成在金屬箔層上對應金屬露出部之部分即可。此外，前述金屬箔層，施予下述之化成處理形成化成皮膜作為基底處理為佳。 The aforementioned first and second metal foil layers 2 and 12 play the role of imparting gas barrier properties to the laminated exterior body 50 to prevent the intrusion of oxygen or moisture. In the first and second metal foil layers 2, 12, when the metal foil exposed portion is used as the conductive portion, a metal foil with good conductivity is used. For example, aluminum foil, copper foil, nickel foil, stainless steel foil, or these covering foils, these burnt foils or unburnt foils are mentioned. In addition, it is also preferable to use metal foil plated with conductive metals such as nickel, tin, copper, chromium, etc., for example, plated aluminum foil. The aforementioned conductive plating film may be formed at least on the metal foil layer corresponding to the metal exposed portion. In addition, the aforementioned metal foil layer is preferably subjected to the following chemical conversion treatment to form a chemical conversion film as a base treatment.

(金屬箔層之化成皮膜) (Metal foil layer formed film)

層壓外裝體50之外側層及內側層，係由樹脂所成之層，此等之樹脂層雖極微量，但仍有從外殼之外部滲入光、氧氣、液體之虞，且亦有從內部滲出內容物(電池之電解液、食品、醫藥品等)之疑慮。此等侵入物到達金屬箔層將成為金屬箔層之腐蝕原因。在此，在金屬箔層2、12之表 面形成具高耐腐蝕性之化成皮膜為佳，藉此可實現金屬箔層2、12之耐腐蝕性的提升。 The outer layer and inner layer of the laminated exterior body 50 are layers made of resin. Although these resin layers are very small, there is still a risk of light, oxygen, and liquid infiltrating from the outside of the shell, and there is also Concerns about internal leakage of contents (battery electrolyte, food, medicine, etc.). These intrusions reach the metal foil layer and become the cause of corrosion of the metal foil layer. Here, on the surface of the metal foil layer 2, 12 It is better to form a chemical conversion film with high corrosion resistance on the surface, so that the corrosion resistance of the metal foil layers 2, 12 can be improved.

前述化成皮膜，係藉由在金屬箔表面(金屬箔之至少一側的表面)施予化成處理所形成之皮膜，例如，可藉由在金屬箔進行鉻酸鹽處理、或施予使用鋯化合物之無鉻型化成處理而形成。例如，塗布下述1)~3)中任一項的水溶液後，使其乾燥從而施予化成處理。 The aforementioned chemical conversion film is a film formed by applying chemical conversion treatment on the surface of the metal foil (the surface of at least one side of the metal foil). For example, it can be formed by chromate treatment on the metal foil, or by applying a zirconium compound. The chromium-free chemical conversion treatment is formed. For example, after applying the aqueous solution of any one of the following 1) to 3), it is dried and chemical conversion treatment is applied.

1)含有磷酸、鉻酸、及選自氟化物之金屬鹽及氟化物之非金屬鹽所成群中至少1種之化合物的混合物之水溶液。 1) An aqueous solution containing a mixture of phosphoric acid, chromic acid, and at least one compound selected from the group of metal salts of fluorides and non-metal salts of fluorides.

2)含有磷酸、選自丙烯酸系樹脂、殼聚醣衍生物樹脂(Chitosan derivative resins)及苯酚系樹脂所成群中至少1種之樹脂、及選自鉻酸及鉻(III)鹽所成群中至少1種之化合物的混合物之水溶液。 2) Contains phosphoric acid, a resin selected from the group consisting of acrylic resins, Chitosan derivative resins (Chitosan derivative resins) and phenol resins, and a group selected from chromic acid and chromium (III) salts An aqueous solution of a mixture of at least one compound.

3)含有磷酸、選自丙烯酸系樹脂、殼聚醣衍生物樹脂及苯酚系樹脂所成群中至少1種之樹脂、選自鉻酸及鉻(III)鹽所成群中至少1種之化合物、及選自氟化物之金屬鹽及氟化物之非金屬鹽所成群中至少選自之化合物 的混合物之水溶液。 3) Containing phosphoric acid, at least one resin selected from the group of acrylic resins, chitosan derivative resins and phenol resins, and at least one compound selected from the group of chromic acid and chromium (III) salts , And at least a compound selected from the group of metal salts of fluoride and non-metal salts of fluoride The mixture of aqueous solution.

前述化成皮膜，其鉻附著量(單面)為0．1mg/m2~50mg/m2為佳，2mg/m2~20mg/m2為特佳。 For the aforementioned chemical conversion film, the chromium adhesion amount (single side) is preferably 0.1 mg/m 2 to 50 mg/m 2 and particularly preferably 2 mg/m 2 to 20 mg/m 2 .

前述金屬箔層2、12之厚度，係20μm~200μm為佳。若為20μm以上，於製造金屬箔時，可防止壓延或熱密封時產生針孔或發生破裂，200μm以下則可縮小鼓脹成形或絞伸成形時之應力並提高成形性。 The thickness of the aforementioned metal foil layers 2 and 12 is preferably 20 μm to 200 μm. If it is 20μm or more, it can prevent pinholes or breakage during rolling or heat sealing when manufacturing metal foil, and 200μm or less can reduce the stress during bulging or strand forming and improve formability.

(第1接著劑層) (1st adhesive layer)

前述第1接著劑層，係擔負使金屬箔層2、12與外側層之耐熱性樹脂層8、18接合之層，例如，使用由作為主劑之聚酯樹脂與作為硬化劑之多官能異氰酸酯化合物所成之二液硬化型聚酯-胺基甲酸酯系樹脂、或者使用含有聚醚-胺基甲酸酯系樹脂之接著劑為佳。 The aforementioned first adhesive layer is a layer responsible for joining the metal foil layers 2, 12 and the heat-resistant resin layers 8, 18 of the outer layer, for example, a polyester resin as a main agent and a polyfunctional isocyanate as a curing agent It is preferable to use a two-component curing type polyester-urethane-based resin made of a compound, or an adhesive containing a polyether-urethane-based resin.

(第2接著劑層) (Second adhesive layer)

前述第2接著劑層，係擔負使金屬箔層2、12與內側層之熱融著性樹脂層4、14接合之層，可列舉例如，由聚胺酯系接著劑、丙烯酸系接著劑、環氧系接著劑、聚烯烴系接著劑、彈性體系接著劑、氟系接著劑等所形成接著劑。其中，以使用丙烯酸系接著劑、聚烯烴系接著劑為佳，此時，可提升外裝體50之耐電解液性及水蒸氣屏障性。此外，將外裝體50作為電池外殼使用時，使用酸變性之聚丙烯、酸變性聚乙烯等之接著劑為佳。 The second adhesive layer is a layer responsible for bonding the metal foil layers 2, 12 and the heat-meltable resin layers 4, 14 of the inner layer. Examples include polyurethane adhesives, acrylic adhesives, and epoxy resins. Adhesives formed by adhesives, polyolefin-based adhesives, elastic system adhesives, fluorine-based adhesives, etc. Among them, it is preferable to use an acrylic adhesive or a polyolefin adhesive. In this case, the electrolyte resistance and water vapor barrier properties of the exterior body 50 can be improved. In addition, when the exterior body 50 is used as a battery case, it is preferable to use an adhesive such as acid-denatured polypropylene or acid-denatured polyethylene.

此外，第1接著劑層及第2接著劑層，為了使上述接著劑未塗佈區域容易判別，亦可將相對於接著劑成分100質量份為0．1質量 份~5質量份範圍之有機系顏料、無機系顏料、色素等之著色劑添加於上述接著劑中。前述有機系顏料，雖無特別限定，但可列舉例如，紅湖、萘酚類、漢撒黃、雙偶氮黃、苯並咪唑等之偶氮顏料、喹啉酮、異吲哚啉、吡咯並吡咯、二噁嗪、酞菁藍、酞菁綠等之多環式系顏料、湖紅C、禾菊紅環等之淀顏料等。此外，前述無機系顏料，雖無特別限定，但可列舉例如，炭黑、二氧化鈦、碳酸鈣、高嶺土、氧化鐵、氧化鋅等。此外，前述色素，雖無特別限定，但可列舉例如，三鈉鹽(黄色4號)等之黄色色素類、二鈉鹽(紅色3號)等之紅色色素類、二鈉鹽(青色1號)等之藍色色素類等。 In addition, the first adhesive layer and the second adhesive layer may be set to 0.1 mass relative to 100 parts by mass of the adhesive component in order to make it easier to distinguish the uncoated area of the adhesive. Coloring agents such as organic pigments, inorganic pigments, and pigments in the range of parts to 5 parts by mass are added to the adhesive. Although the aforementioned organic pigments are not particularly limited, for example, azo pigments such as red lake, naphthols, Hansa yellow, disazo yellow, benzimidazole, quinolinone, isoindoline, pyrrole Polycyclic pigments such as pyrrole, dioxazine, phthalocyanine blue and phthalocyanine green, lake red C, and lake pigments such as chrysanthemum red ring, etc. In addition, the aforementioned inorganic pigments are not particularly limited, but examples thereof include carbon black, titanium dioxide, calcium carbonate, kaolin, iron oxide, zinc oxide, and the like. In addition, the aforementioned pigments are not particularly limited, but for example, yellow pigments such as trisodium salt (yellow No. 4), red pigments such as disodium salt (red No. 3), and disodium salt (cyan No. 1) ) And other blue pigments.

此外，外裝體50之總厚較佳係50μm~300μm之範圍。若總厚未達50μm，則成形時及熱密封時容易破裂或產生針孔。此外總厚超過300μm有成形性下降之虞。 In addition, the total thickness of the exterior body 50 is preferably in the range of 50 μm to 300 μm. If the total thickness is less than 50 μm, cracks or pinholes are likely to occur during molding and heat sealing. In addition, if the total thickness exceeds 300 μm, the formability may decrease.

【實施例】 [Example]

接著，說明本發明之具體實施例，惟本發明並非限定為此等實施例者。 Next, specific embodiments of the present invention will be described, but the present invention is not limited to these embodiments.

〈實施例1〉 <Example 1>

在厚40μm之鋁箔的兩面上，塗佈含有聚丙烯酸、磷酸、鉻及氟之化合物的化成處理液，進行150℃乾燥，使鉻附著量成為3mg/m2。 A chemical conversion treatment solution containing polyacrylic acid, phosphoric acid, chromium and fluorine compounds was coated on both sides of an aluminum foil with a thickness of 40 μm, and dried at 150°C so that the chromium adhesion amount was 3 mg/m 2 .

在前述完成化成處理之鋁箔(金屬箔層)的一側的面，塗佈聚酯-胺基甲酸乙酯系接著劑。進行此塗佈時，係藉由使鋁箔之一側的面的端部之一部分遮蔽(貼附遮蔽膠帶)作為接著劑未塗佈區域。之後，在 此聚酯-胺基甲酸乙酯系接著劑塗佈面貼附厚25μm之二軸延伸聚醯胺薄膜(耐熱性樹脂層)。接著，在前述鋁箔之另一側的面，塗佈酸變性聚丙烯系接著劑。進行此塗佈時，係藉由使鋁箔之另一側的面的中央部遮蔽(貼附遮蔽膠帶)作為接著劑未塗佈區域。之後，在此酸變性聚丙烯系接著劑塗佈面貼合厚40μm之未延伸聚丙烯薄膜(熱融著性樹脂層)，從而得到積層體。 A polyester-urethane-based adhesive is applied to the surface of the aluminum foil (metal foil layer) that has completed the chemical conversion treatment. When this coating is performed, a part of the end of one side of the aluminum foil is masked (masking tape is attached) as an adhesive uncoated area. After A 25 μm-thick biaxially stretched polyamide film (heat-resistant resin layer) is attached to this polyester-urethane-based adhesive coating surface. Next, an acid-denatured polypropylene-based adhesive was coated on the other side of the aluminum foil. When this coating is performed, the center portion of the other side of the aluminum foil is masked (masking tape is attached) as the adhesive uncoated area. Thereafter, an unstretched polypropylene film (hot-melt adhesive resin layer) having a thickness of 40 μm was bonded to this acid-modified polypropylene adhesive coating surface to obtain a laminate.

接著，使用雷射照射前述積層體中耐熱性樹脂層的接著劑未塗佈區域之周緣以切斷耐熱性樹脂層，從而除去接著劑未塗佈區域中之耐熱性樹脂層，形成端子部。此外，使用雷射照射前述積層體中熱融著性樹脂層的接著劑未塗佈區域之周緣以切斷熱融著性樹脂層，從而除去接著劑未塗佈區域中之熱融著性樹脂層，形成導電部，製得平面材之外裝體50。準備2張此外裝體50。 Next, a laser is used to irradiate the periphery of the adhesive uncoated area of the heat-resistant resin layer in the laminate to cut off the heat-resistant resin layer, thereby removing the heat-resistant resin layer in the adhesive uncoated area to form a terminal portion. In addition, a laser is used to irradiate the periphery of the adhesive uncoated area of the thermally fusible resin layer in the aforementioned laminate to cut off the thermally fusible resin layer, thereby removing the thermally fusible resin in the adhesive uncoated area Layer, forming a conductive part, and fabricating a planar outer package 50. Prepare 2 pieces of outer casing 50.

接著，使用前述2張外裝體，採用前項所說明之方法、構成而作成圖1、2所示構成之電池。電解液，係使用碳酸乙烯酯(EC)、碳酸二甲酯(DMC)、碳酸甲乙酯(EMC)以等量體積比調配所成之混合溶劑，將六氟磷酸鋰(LiPF6)溶解成濃度為1莫爾/L之電解液，並將此與裸電池一同收容至前述2張外裝體所形成之收容空間內。此外，前述2張外裝體之周緣部的各熱融著性樹脂層之相互熱密封接合，係在較大氣壓為低之1KPa的氣壓環境下進行。 Next, using the aforementioned two exterior bodies, the battery having the configuration shown in Figs. 1 and 2 was produced using the method and configuration described in the preceding paragraph. The electrolyte is a mixed solvent of ethylene carbonate (EC), dimethyl carbonate (DMC), and ethyl methyl carbonate (EMC) in equal volume ratios, and lithium hexafluorophosphate (LiPF 6 ) is dissolved to a concentration of 1 Mohr/L electrolyte, and store this together with the bare cell in the containing space formed by the two external bodies. In addition, the heat-sealing bonding of the thermally fusible resin layers on the peripheral edges of the aforementioned two exterior bodies was performed in an air pressure environment where the larger air pressure was lower than 1 kPa.

〈實施例2〉 <Example 2>

準備與實施例1所作成之外裝體相同之外裝體2張，使用此2張外裝體，採用前項所說明之方法、構成而作成圖4、5所示構成之電池。電解 液，係使用與實施例1相同之電解液。又，凹陷部71之底部及側面所成之角度α，係設定為150°，且凹陷部71之深度係設定為1mm。此外，前述2張外裝體之周緣部的各熱融著性樹脂層之相互熱密封接合，係在較大氣壓為低之1KPa的氣壓環境下進行。 Prepare two exterior bodies that are the same as the exterior bodies made in Example 1. Using these two exterior bodies, the battery with the configuration shown in Figs. 4 and 5 is produced using the method and configuration described in the preceding paragraph. electrolysis As the solution, the same electrolyte as in Example 1 was used. In addition, the angle α formed by the bottom and side surfaces of the recessed portion 71 is set to 150°, and the depth of the recessed portion 71 is set to 1 mm. In addition, the heat-sealing bonding of the respective thermally fusible resin layers on the peripheral edge portions of the aforementioned two exterior bodies was performed in an air pressure environment where the larger air pressure was lower than 1 kPa.

根據上述所得之實施例1、2的電池，以下述評估法評估其外裝體之破裂防止性。 According to the batteries of Examples 1 and 2 obtained above, the rupture prevention property of the exterior body was evaluated by the following evaluation method.

〈破裂防止性評估法〉 <Rupture Prevention Evaluation Method>

藉由進行過度之升溫促進電解液的分解(產生分解氣體)，各電池之內壓緩緩上升之際，測定此時電池之現象。 Excessive heating promotes the decomposition of the electrolyte (decomposition gas is generated), and when the internal pressure of each battery gradually rises, the phenomenon of the battery at that time is measured.

本發明之實施例1之電池，進行升溫至90℃，因分解氣體的積蓄導致內壓上升時，藉由外裝體向外側膨脹，使原為接觸狀態之負極導電部54與負極62分離，成為互相非接觸狀態(導通被遮斷成為非導通狀態)(參照圖3)。又，互相接合之正極導電部56與正極61，並未分離，而係仍維持接合狀態(參照圖3)。 The battery of Example 1 of the present invention is heated to 90°C. When the internal pressure rises due to the accumulation of decomposition gas, the outer casing expands outward to separate the negative electrode conductive portion 54 and the negative electrode 62 that are in contact. It is in a non-contact state (conduction is blocked and becomes a non-conduction state) (see FIG. 3). In addition, the positive electrode conductive portion 56 and the positive electrode 61 that are joined to each other are not separated, but still maintain the joined state (see FIG. 3).

本發明之實施例2之電池，進行升溫至90℃，因分解氣體的積蓄導致內壓上升時，2個凹陷部71皆膨脹，反轉成為向外側突出之凸部81，藉此，使原為接觸狀態之導電部與電極分離，成為互相非接觸狀態(導通被遮斷成為非導通狀態)(參照圖6)。 When the battery of Example 2 of the present invention is heated to 90°C, when the internal pressure rises due to the accumulation of decomposition gas, the two recessed portions 71 are expanded and inverted to become a convex portion 81 protruding outward, thereby causing the original The conductive part and the electrode in the contact state are separated from each other and become a non-contact state (conduction is blocked and becomes a non-conduction state) (refer to FIG. 6).

因此，本發明之實施例1、2之電池，在實際使用(充電、放電等)之狀態中，即使因產生氣體的積蓄導致內壓上升，亦可在此內壓上升時遮斷導通，從而將不會再產生更多之氣體，故可防止外裝體的破裂。 Therefore, the batteries of the first and second embodiments of the present invention, in actual use (charging, discharging, etc.), even if the internal pressure rises due to the accumulation of generated gas, the conduction can be blocked when the internal pressure rises, thereby No more gas will be generated, so the outer casing can be prevented from breaking.

【產業上利用的可能性】[Possibility of industrial use]

本發明之蓄電裝置，具體例可列舉例如：‧鋰蓄電池(鋰離子電池、鋰聚合物電池等)等之電化學裝置‧鋰離子電容器‧雙電層電容器等。 Specific examples of the power storage device of the present invention can include, for example: ‧ electrochemical devices such as lithium storage batteries (lithium ion batteries, lithium polymer batteries, etc.) ‧ lithium ion capacitors ‧ electric double layer capacitors, etc.

本申請案，係伴隨著在2015年4月28日提出申請的日本專利申請案的特願2015-91042號的優先權主張，其揭示內容直接構成本申請案的一部分。 This application is a priority claim in Japanese Patent Application No. 2015-91042 accompanying the Japanese patent application filed on April 28, 2015, and the disclosure content directly constitutes a part of this application.

在此所使用的用語及說明，係用以說明本發明的實施形態所使用，但本發明並不限定於此。在本發明所揭示且敘述的特徵事項的任何均等物皆不應被排除，且在本發明所請求的範圍內的各種變形亦應被理解為係可被接受的。 The terms and descriptions used here are used to describe the embodiments of the present invention, but the present invention is not limited to these. Any equivalent of the characteristic items disclosed and described in the present invention should not be excluded, and various modifications within the scope of the present invention should also be understood as acceptable.

1‧‧‧蓄電裝置 1.‧‧Power storage device

2‧‧‧第一金屬箔層 2‧‧‧The first metal foil layer

4‧‧‧第一熱融著性樹脂層 4‧‧‧The first hot melt resin layer

8‧‧‧第一耐熱性樹脂層 8‧‧‧The first heat-resistant resin layer

9‧‧‧正極端子部(金屬箔露出部) 9‧‧‧Positive terminal part (metal foil exposed part)

12‧‧‧第二金屬箔層 12‧‧‧Second metal foil layer

14‧‧‧第二熱融著性樹脂層 14‧‧‧Second hot melt resin layer

18‧‧‧第二耐熱性樹脂層 18‧‧‧Second heat-resistant resin layer

19‧‧‧負極端子部(金屬箔露出部) 19‧‧‧Negative terminal part (metal foil exposed part)

50‧‧‧外裝體 50‧‧‧Exterior body

54‧‧‧負極導電部(金屬箔露出部) 54‧‧‧Negative conductive part (metal foil exposed part)

56‧‧‧正極導電部(金屬箔露出部) 56‧‧‧Positive electrode conductive part (metal foil exposed part)

60‧‧‧裝置本體部 60‧‧‧Device body

61‧‧‧正極 61‧‧‧Positive

62‧‧‧負極 62‧‧‧Negative pole

63‧‧‧隔板 63‧‧‧Partition

Claims (9)

一種蓄電裝置，其特徵為其係具備：裝置本體部、及收容該裝置本體部之外裝體2張；且前述外裝體，係具有金屬箔層、在此金屬箔層之一側的面上所積層之熱融著性樹脂層、及在前述金屬箔層之另一側的面上所積層之耐熱性樹脂層，並在前述金屬箔層之前述一側的面之一部分，設置未被前述熱融著性樹脂層覆蓋之導電部；配置為個別之熱融著性樹脂層互相面向的前述2張外裝體之間的空間，收容前述裝置本體部，將前述2張之外裝體的周緣部之各熱融著性樹脂層相互接合而密封；前述裝置本體部之正極，係與前述一側的外裝體之導電部電連接，前述裝置本體部之負極，係與前述另一側的外裝體之導電部電連接，收容前述裝置本體部之空間內的內壓，較大氣壓為小，使前述正極及負極中至少一者之電極，係藉由對於前述導電部為面接觸狀態而進行前述電連接；前述2張外裝體的其中一張為本體，前述本體係具有凹部及由該凹部之開口緣向外側延伸之凸緣，前述2張外裝體的另一張為蓋體；於前述本體的凸緣及蓋體的周緣部的接合密封部設置正極端子部及負極端子部；前述正極端子部，係藉由使前述2張金屬箔層的其中一張金屬箔層之另一側的面之端部露出的露出部所形成；前述負極端子部，係藉由使前述2張金屬箔層的另一張金屬箔層之另一側的面之端部露出的露 出部所形成。 An electrical storage device, characterized in that it is provided with: a device body and two exterior bodies accommodating the device body; and the exterior body has a metal foil layer on one side of the metal foil layer. The heat-fusible resin layer laminated on the top, and the heat-resistant resin layer laminated on the other side of the metal foil layer, and a part of the metal foil layer on the side The conductive portion covered by the thermally fusible resin layer; the space between the two exterior bodies where the individual thermally fusible resin layers face each other to accommodate the main body of the device, and the two exterior bodies The thermally fusible resin layers of the peripheral portion of the device are joined to each other and sealed; the positive electrode of the device body is electrically connected to the conductive portion of the outer body on one side, and the negative electrode of the device body is connected to the other The conductive part of the outer casing on the side is electrically connected, and the internal pressure in the space accommodating the main body of the device is larger and smaller, so that the electrode of at least one of the positive and negative electrodes is in surface contact with the conductive part The aforementioned electrical connection is made in the state; one of the aforementioned two exterior bodies is the main body, the aforementioned system has a recess and a flange extending outward from the opening edge of the recess, and the other of the aforementioned two exterior bodies is Cover; the positive terminal portion and the negative terminal portion are provided at the joint sealing portion of the flange of the body and the periphery of the cover; the positive terminal portion is formed by using one of the two metal foil layers The end of the other side of the surface is exposed; the negative terminal is formed by exposing the end of the other side of the other metal foil layer of the two metal foil layers. Formed out of the department. 如申請專利範圍第1項所記載之蓄電裝置，其中，前述耐熱性樹脂層係由二軸延伸聚醯胺薄膜所成。 The power storage device described in the first item of the patent application, wherein the heat-resistant resin layer is made of a biaxially stretched polyamide film. 如申請專利範圍第1項所記載之蓄電裝置，其中，前述耐熱性樹脂層係由二軸延伸聚酯薄膜所成。 The power storage device described in the first item of the patent application, wherein the heat-resistant resin layer is formed of a biaxially stretched polyester film. 如申請專利範圍第1項所記載之蓄電裝置，其中，前述耐熱性樹脂層，係由二軸延伸聚醯胺薄膜與二軸延伸聚酯薄膜貼合之複層薄膜所成。 The power storage device described in the first item of the scope of patent application, wherein the heat-resistant resin layer is formed of a biaxially stretched polyamide film and a biaxially stretched polyester film bonded to a multi-layer film. 如申請專利範圍第1項所記載之蓄電裝置，其中，前述外裝體，在包含藉由為前述接觸狀態電連接之導電部的區域中，形成有向前述裝置本體部側凹陷之凹陷部。 The power storage device described in claim 1, wherein the exterior body has a recessed portion recessed toward the device main body in a region including the conductive portion electrically connected in the contact state. 如申請專利範圍第5項所記載之蓄電裝置，其中，前述凹陷部之底面及側面所成角度係較90度大者。 As for the power storage device described in item 5 of the scope of patent application, the angle formed by the bottom and side surfaces of the aforementioned recessed portion is greater than 90 degrees. 如申請專利範圍第5項所記載之蓄電裝置，其中，前述凹陷部之底面及側面所成角度為「α」時，係100°≦α≦160°。 The power storage device described in the fifth item of the scope of patent application, wherein, when the angle formed by the bottom surface and the side surface of the aforementioned recessed portion is "α", it is 100°≦α≦160°. 如申請專利範圍第5項所記載之蓄電裝置，其中，前述凹陷部之平面視形狀，係略圓形狀或略橢圓形狀。 As for the power storage device described in item 5 of the scope of patent application, the shape of the depression in plan view is a slightly round shape or a slightly elliptical shape. 如申請專利範圍第1或5項所記載之蓄電裝置，其中，其係在較大氣壓為小之氣壓環境下，進行前述周緣部之各別熱融著性樹脂層的接合。 The power storage device as described in the first or the fifth of the scope of patent application, wherein the bonding of the respective thermally fusible resin layers of the peripheral portion is performed in an environment where the pressure is relatively large but small.
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