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JP6964190B2 - battery - Google Patents
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JP6964190B2 - battery - Google Patents

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JP6964190B2
JP6964190B2 JP2020519558A JP2020519558A JP6964190B2 JP 6964190 B2 JP6964190 B2 JP 6964190B2 JP 2020519558 A JP2020519558 A JP 2020519558A JP 2020519558 A JP2020519558 A JP 2020519558A JP 6964190 B2 JP6964190 B2 JP 6964190B2
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exterior material
laminated body
laminate
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battery
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JPWO2019220921A1 (en
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直之 岩田
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AESC Japan Ltd
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Envision AESC Japan Ltd
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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • 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
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/557—Plate-shaped terminals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Description

本発明は、電池に関する。 The present invention relates to a battery.

近年、非水電解液二次電池、特に、リチウムイオン二次電池が開発されている。リチウムイオン二次電池は、正極、負極及びセパレータを含む積層体を有している。正極、負極及びセパレータは、正極と負極がセパレータによって隔てられるように積層されている。積層体は、外装材によって封止されている。 In recent years, non-aqueous electrolyte secondary batteries, particularly lithium ion secondary batteries, have been developed. The lithium ion secondary battery has a laminate including a positive electrode, a negative electrode, and a separator. The positive electrode, the negative electrode, and the separator are laminated so that the positive electrode and the negative electrode are separated by the separator. The laminate is sealed with an exterior material.

特許文献１には、外装材によって積層体を封止する方法の一例が記載されている。この例では、外装材は、２つの分離可能なフィルムを含んでいる。各フィルムには、凹部が形成されている。２つのフィルムは、各フィルムの凹部によって形成された空間内に積層体が収容されるように、互いに貼り合わされている。特許文献１には、積層体の周辺において、外装材に皺が形成されることが記載されている。 Patent Document 1 describes an example of a method of sealing a laminate with an exterior material. In this example, the exterior material contains two separable films. A recess is formed in each film. The two films are attached to each other so that the laminate is accommodated in the space formed by the recesses of the films. Patent Document 1 describes that wrinkles are formed on the exterior material around the laminated body.

特開２００６−１８５７１３号公報Japanese Unexamined Patent Publication No. 2006-185713

外装材によって積層体を封止する方法は、特許文献１に記載された例に限らず、特許文献１に記載された例とは異なる方法、例えば、外装材を積層体に沿って折り返すことも含む。本発明者は、外装材を積層体に沿って折り返すことを検討し、特に、外装材による積層体の収容空間を小さくすることを検討した。 The method of sealing the laminate with the exterior material is not limited to the example described in Patent Document 1, but a method different from the example described in Patent Document 1, for example, the exterior material may be folded back along the laminate. include. The present inventor has studied folding the exterior material along the laminate, and in particular, considering reducing the accommodation space of the laminate by the exterior material.

本発明の目的は、外装材による積層体の収容空間を小さくすることにある。 An object of the present invention is to reduce the accommodation space of the laminated body by the exterior material.

本発明によれば、
第１電極、第２電極及びセパレータを含み、第１面と、前記第１面の反対側の第２面と、前記第１面と前記第２面の間にあって、第１リードが形成された第１側面と、前記第１側面に交わる第２側面と、前記第１側面の反対側の第３側面と、前記第２側面の反対側の第４側面と、前記第１側面と前記第２側面の間の第１角と、を有する積層体と、
前記積層体の前記第１面から前記第４側面を経由して前記第２面にかけて折り返されており、前記積層体の前記第１側面及び前記第２側面の外側で貼り合わされた第１部分及び第２部分と、を有する外装材と、
を含み、
前記外装材の前記第１部分及び前記第２部分は、前記積層体の前記第１角から延伸する第１歪みを有する、電池が提供される。According to the present invention
A first lead was formed between the first surface, the second surface opposite the first surface, and the first surface and the second surface, including the first electrode, the second electrode, and the separator. The first side surface, the second side surface intersecting the first side surface, the third side surface on the opposite side of the first side surface, the fourth side surface on the opposite side of the second side surface, the first side surface and the second side surface. A laminate having a first corner between the sides, and
A first portion of the laminated body, which is folded back from the first surface to the second surface via the fourth side surface and bonded to the outside of the first side surface and the second side surface of the laminated body, and The second part, the exterior material with, and
Including
A battery is provided in which the first portion and the second portion of the exterior material have a first strain extending from the first corner of the laminate.

本発明によれば、外装材による積層体の収容空間を小さくすることができる。 According to the present invention, the accommodation space of the laminated body by the exterior material can be reduced.

上述した目的、およびその他の目的、特徴および利点は、以下に述べる好適な実施の形態、およびそれに付随する以下の図面によってさらに明らかになる。 The above-mentioned objectives and other objectives, features and advantages will be further clarified by the preferred embodiments described below and the accompanying drawings below.

実施形態に係る電池の斜視図である。It is a perspective view of the battery which concerns on embodiment. 図１に示した電池の一部を拡大した平面図である。It is an enlarged plan view of a part of the battery shown in FIG. 図１及び図２に示した電池の製造方法の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing method of the battery shown in FIG. 1 and FIG. 図１及び図２に示した電池の製造方法の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing method of the battery shown in FIG. 1 and FIG. 図１及び図２に示した電池の製造方法の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing method of the battery shown in FIG. 1 and FIG. 図１及び図２に示した電池の製造方法の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing method of the battery shown in FIG. 1 and FIG. 図１及び図２に示した電池の製造方法の一例を説明するための図である。It is a figure for demonstrating an example of the manufacturing method of the battery shown in FIG. 1 and FIG. 図２の変形例を示す図である。It is a figure which shows the modification of FIG.

以下、本発明の実施の形態について、図面を用いて説明する。尚、すべての図面において、同様な構成要素には同様の符号を付し、適宜説明を省略する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all drawings, similar components are designated by the same reference numerals, and description thereof will be omitted as appropriate.

図１は、実施形態に係る電池１０の斜視図である。図２は、図１に示した電池１０の一部を拡大した平面図である。 FIG. 1 is a perspective view of the battery 10 according to the embodiment. FIG. 2 is an enlarged plan view of a part of the battery 10 shown in FIG.

図１を用いて、電池１０の概要を説明する。電池１０は、積層体１００及び外装材２００を含んでいる。積層体１００は、第１電極１１０、第２電極１２０及びセパレータ１３０を含んでいる。積層体１００は、第１面１０２ａ、第２面１０２ｂ、第１側面１０４ａ、第２側面１０４ｂ、第３側面１０４ｃ、第４側面１０４ｄ及び第１角１０６ａを有している。第２面１０２ｂは、第１面１０２ａの反対側にある。第１側面１０４ａは、第１面１０２ａと第２面１０２ｂの間にある。第１側面１０４ａには、第１リード１１２が形成されている。第２側面１０４ｂは、第１側面１０４ａに交わっている。第３側面１０４ｃは、第１側面１０４ａの反対側にある。第４側面１０４ｄは、第２側面１０４ｂの反対側にある。第１角１０６ａは、第１側面１０４ａと第２側面１０４ｂの間にある。外装材２００は、積層体１００の第１面１０２ａから第４側面１０４ｄを経由して第２面１０２ｂにかけて折り返されている。外装材２００は、第１部分２１０及び第２部分２２０を有している。第１部分２１０及び第２部分２２０は、積層体１００の第１側面１０４ａ及び第２側面１０４ｂの外側で貼り合わされている。外装材２００の第１部分２１０及び第２部分２２０は、歪み２０２ａ（第１歪み）を有している。歪み２０２ａは、積層体１００の第１角１０６ａから延伸している。 The outline of the battery 10 will be described with reference to FIG. The battery 10 includes a laminate 100 and an exterior material 200. The laminate 100 includes a first electrode 110, a second electrode 120, and a separator 130. The laminate 100 has a first surface 102a, a second surface 102b, a first side surface 104a, a second side surface 104b, a third side surface 104c, a fourth side surface 104d, and a first angle 106a. The second surface 102b is on the opposite side of the first surface 102a. The first side surface 104a is between the first surface 102a and the second surface 102b. A first lead 112 is formed on the first side surface 104a. The second side surface 104b intersects the first side surface 104a. The third side surface 104c is on the opposite side of the first side surface 104a. The fourth side surface 104d is on the opposite side of the second side surface 104b. The first angle 106a is between the first side surface 104a and the second side surface 104b. The exterior material 200 is folded back from the first surface 102a of the laminated body 100 to the second surface 102b via the fourth side surface 104d. The exterior material 200 has a first portion 210 and a second portion 220. The first portion 210 and the second portion 220 are bonded to each other on the outside of the first side surface 104a and the second side surface 104b of the laminated body 100. The first portion 210 and the second portion 220 of the exterior material 200 have a strain 202a (first strain). The strain 202a extends from the first angle 106a of the laminated body 100.

上述した構成によれば、外装材２００による積層体１００の収容空間を小さくすることができる。具体的には、上述した構成においては、外装材２００の第１部分２１０及び第２部分２２０は、歪み２０２ａを有している。歪み２０２ａは、外装材２００の第１部分２１０及び第２部分２２０を積層体１００の第２側面１０４ｂに近接した領域で貼り合わせた場合に、後述する隆起２０４ａ（例えば、図５）を解消するように外装材２００の第１部分２１０及び第２部分２２０が変形することで形成される。したがって、歪み２０２ａの存在は、積層体１００の第２側面１０４ｂに近接した領域で外装材２００の第１部分２１０及び第２部分２２０が貼り合わせられているとこと、すなわち、外装材２００による積層体１００の収容空間が小さくなっていることを示している。 According to the above-described configuration, the accommodation space of the laminated body 100 by the exterior material 200 can be reduced. Specifically, in the above-described configuration, the first portion 210 and the second portion 220 of the exterior material 200 have a strain 202a. The strain 202a eliminates the ridge 204a (for example, FIG. 5) described later when the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in a region close to the second side surface 104b of the laminated body 100. As described above, the first portion 210 and the second portion 220 of the exterior material 200 are formed by being deformed. Therefore, the presence of the strain 202a means that the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in a region close to the second side surface 104b of the laminated body 100, that is, the lamination by the exterior material 200. It shows that the accommodation space of the body 100 is getting smaller.

図１に示す例では、積層体１００の第３側面１０４ｃには、第２リード１２２が形成されている。積層体１００は、第２角１０６ｂを有している。第２角１０６ｂは、第３側面１０４ｃと第２側面１０４ｂの間にある。外装材２００の第１部分２１０及び第２部分２２０は、積層体１００の第３側面１０４ｃの外側で貼り合わされている。外装材２００の第１部分２１０及び第２部分２２０は、歪み２０２ｂ（第２歪み）を有している。歪み２０２ｂは、積層体１００の第２角１０６ｂから延伸している。 In the example shown in FIG. 1, a second lead 122 is formed on the third side surface 104c of the laminated body 100. The laminated body 100 has a second angle 106b. The second corner 106b is between the third side surface 104c and the second side surface 104b. The first portion 210 and the second portion 220 of the exterior material 200 are bonded to each other on the outside of the third side surface 104c of the laminated body 100. The first portion 210 and the second portion 220 of the exterior material 200 have a strain 202b (second strain). The strain 202b extends from the second angle 106b of the laminated body 100.

他の例において、第１リード１１２及び第２リード１２２の双方が、積層体１００の共通の面、例えば、第１側面１０４ａ又は第３側面１０４ｃに形成されていてもよい。第１リード１１２及び第２リード１２２の双方が第１側面１０４ａに形成されている場合、第１部分２１０及び第２部分２２０は、積層体１００の第１側面１０４ａ及び第２側面１０４ｂの外側で貼り合わされ、歪み２０２ａを有する。 In another example, both the first lead 112 and the second lead 122 may be formed on a common surface of the laminate 100, for example, the first side surface 104a or the third side surface 104c. When both the first lead 112 and the second lead 122 are formed on the first side surface 104a, the first portion 210 and the second portion 220 are outside the first side surface 104a and the second side surface 104b of the laminate 100. It is bonded and has a strain of 202a.

図１を用いて、積層体１００の詳細を説明する。 The details of the laminated body 100 will be described with reference to FIG.

積層体１００は、第１電極１１０、第２電極１２０及びセパレータ１３０を含んでいる。第１電極１１０及び第２電極１２０は、互いに異なる極性を有しており、それぞれ、正極及び負極であってもよいし、又は、それぞれ、負極及び正極であってもよい。第１電極１１０、第２電極１２０及びセパレータ１３０は、第１電極１１０と第２電極１２０がセパレータ１３０によって隔てられるように第１面１０２ａから第２面１０２ｂにかけて積層されている。積層体１００は、複数の第１電極１１０及び複数の第２電極１２０を含んでいてもよい。この場合、隣り合う第１電極１１０と第２電極１２０がセパレータ１３０によって隔てられる。 The laminate 100 includes a first electrode 110, a second electrode 120, and a separator 130. The first electrode 110 and the second electrode 120 have different polarities from each other and may be a positive electrode and a negative electrode, respectively, or may be a negative electrode and a positive electrode, respectively. The first electrode 110, the second electrode 120, and the separator 130 are laminated from the first surface 102a to the second surface 102b so that the first electrode 110 and the second electrode 120 are separated by the separator 130. The laminate 100 may include a plurality of first electrodes 110 and a plurality of second electrodes 120. In this case, the adjacent first electrode 110 and the second electrode 120 are separated by the separator 130.

積層体１００は、実質的に直方体の形状を有している。積層体１００は、第１面１０２ａと第２面１０２ｂの間に厚さを有しており、第１側面１０４ａと第３側面１０４ｃの間に長さを有しており、第２側面１０４ｂと第４側面１０４ｄの間に幅を有している。 The laminated body 100 has a substantially rectangular parallelepiped shape. The laminate 100 has a thickness between the first surface 102a and the second surface 102b, a length between the first side surface 104a and the third side surface 104c, and the second side surface 104b. It has a width between the fourth side surfaces 104d.

図１に示す例では、積層体１００の長さ（第１側面１０４ａと第３側面１０４ｃの間）は、積層体１００の幅（第２側面１０４ｂと第４側面１０４ｄの間）よりも大きくなっている。幅に対する長さの比が大きいと、積層体１００の第２側面１０４ｂ又は第４側面１０４ｄが下方を向くように積層体１００を載置しやすくなる。積層体１００の第２側面１０４ｂ又は第４側面１０４ｄが下方を向くように積層体１００を安定的に載置させるため、上述した比は例えば２．０超にすることができる。 In the example shown in FIG. 1, the length of the laminated body 100 (between the first side surface 104a and the third side surface 104c) is larger than the width of the laminated body 100 (between the second side surface 104b and the fourth side surface 104d). ing. When the ratio of the length to the width is large, it becomes easy to place the laminate 100 so that the second side surface 104b or the fourth side surface 104d of the laminate 100 faces downward. In order to stably place the laminate 100 so that the second side surface 104b or the fourth side surface 104d of the laminate 100 faces downward, the above ratio can be, for example, more than 2.0.

積層体１００の第１側面１０４ａからは、第１リード１１２が突出している。第１リード１１２は、積層体１００の第１電極１１０に電気的に接続している。 The first lead 112 protrudes from the first side surface 104a of the laminated body 100. The first lead 112 is electrically connected to the first electrode 110 of the laminated body 100.

積層体１００の第２側面１０４ｂからは、第２リード１２２が突出している。第２リード１２２は、積層体１００の第２電極１２０に電気的に接続している。 The second lead 122 protrudes from the second side surface 104b of the laminated body 100. The second lead 122 is electrically connected to the second electrode 120 of the laminated body 100.

後述するように、本実施形態は、第１面１０２ａと第２面１０２ｂの間の厚さが大きい場合に特に有意義である。積層体１００は、第１面１０２ａと第２面１０２ｂの間に、例えば、５．０ｍｍ以上、７．５ｍｍ以上又は１０．０ｍｍ以上の厚さを有することができる。 As will be described later, this embodiment is particularly meaningful when the thickness between the first surface 102a and the second surface 102b is large. The laminate 100 can have a thickness of, for example, 5.0 mm or more, 7.5 mm or more, or 10.0 mm or more between the first surface 102a and the second surface 102b.

図１を用いて、外装材２００の詳細を説明する。 The details of the exterior material 200 will be described with reference to FIG.

外装材２００は、積層体１００を収容するための空間を画定している。外装材２００のこの空間には、積層体１００及び電解液が収容される。このようにして、外装材２００は、積層体１００を封止している。 The exterior material 200 defines a space for accommodating the laminated body 100. The laminated body 100 and the electrolytic solution are housed in this space of the exterior material 200. In this way, the exterior material 200 seals the laminated body 100.

図１に示す例において、外装材２００による積層体１００の収容空間は、エンボスによって形成されていない。外装材２００は、積層体１００を包むように、積層体１００の第１面１０２ａと第４側面１０４ｄの間の角及び第２面１０２ｂと第４側面１０４ｄの間の角に沿って折り曲げられている。さらに、外装材２００は、積層体１００の第４側面１０４ｄに沿って延伸する部分を含んでいる。一般に、深さの大きい凹みを形成するためのエンボスには、複雑な技術が必要となる。したがって、積層体１００の厚さが大きいほど、外装材２００による積層体１００の収容空間をエンボスによって形成するためには複雑な技術が必要になる。これに対して本実施形態では、エンボスを用いる必要がない。したがって、積層体１００の厚さが大きくても、外装材２００による積層体１００の収容空間を容易に形成することができる。 In the example shown in FIG. 1, the accommodation space of the laminated body 100 made of the exterior material 200 is not formed by embossing. The exterior material 200 is bent along the corner between the first surface 102a and the fourth side surface 104d and the corner between the second surface 102b and the fourth side surface 104d of the laminate 100 so as to wrap the laminate 100. .. Further, the exterior material 200 includes a portion extending along the fourth side surface 104d of the laminated body 100. In general, embossing to form a deep recess requires a complicated technique. Therefore, the larger the thickness of the laminated body 100, the more complicated technique is required to form the accommodation space of the laminated body 100 by the exterior material 200 by embossing. On the other hand, in this embodiment, it is not necessary to use embossing. Therefore, even if the thickness of the laminated body 100 is large, the accommodation space of the laminated body 100 by the exterior material 200 can be easily formed.

図１及び図２を用いて、外装材２００の歪み２０２ａの詳細を説明する。 The details of the distortion 202a of the exterior material 200 will be described with reference to FIGS. 1 and 2.

歪み２０２ａは、積層体１００の第１角１０６ａから外装材２００の縁（積層体１００の第１側面１０４ａに沿った縁）にかけて延伸している。外装材２００の断面において、歪み２０２ａにおける外装材２００の第１部分２１０及び第２部分２２０は、凸状に湾曲している。歪み２０２ｂも、歪み２０２ａと同様の形状を有している。 The strain 202a extends from the first corner 106a of the laminated body 100 to the edge of the exterior material 200 (the edge along the first side surface 104a of the laminated body 100). In the cross section of the exterior material 200, the first portion 210 and the second portion 220 of the exterior material 200 in the strain 202a are curved in a convex shape. The strain 202b also has the same shape as the strain 202a.

図３から図７は、図１及び図２に示した電池１０の製造方法の一例を説明するための図である。 3 to 7 are diagrams for explaining an example of the manufacturing method of the battery 10 shown in FIGS. 1 and 2.

まず、図３に示すように、積層体１００の第１面１０２ａ（図１）から第４側面１０４ｄを経由して第２面１０２ｂ（図１）にかけて外装材２００を折り返す。このようにして、外装材２００のうちの第１部分２１０及び第２部分２２０を積層体１００の第１側面１０４ａ、第２側面１０４ｂ及び第３側面１０４ｃの外側で重ね合わせる。 First, as shown in FIG. 3, the exterior material 200 is folded back from the first surface 102a (FIG. 1) of the laminated body 100 to the second surface 102b (FIG. 1) via the fourth side surface 104d. In this way, the first portion 210 and the second portion 220 of the exterior material 200 are overlapped on the outside of the first side surface 104a, the second side surface 104b, and the third side surface 104c of the laminated body 100.

次いで、図４に示すように、第１領域２３２において外装材２００の第１部分２１０及び第２部分２２０を貼り合わせる。第１領域２３２は、積層体１００の第１側面１０４ａに沿っている。 Next, as shown in FIG. 4, the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in the first region 232. The first region 232 is along the first side surface 104a of the laminated body 100.

第１領域２３２における第１部分２１０及び第２部分２２０の貼り合わせによって、隆起２０４ａ（第１隆起）が第１部分２１０に形成される。隆起２０４ａは、第１角１０６ａから第１領域２３２にかけて延伸している。隆起２０４ａの幅は、第１角１０６ａから遠ざかるほど狭くなっている。隆起２０４ａは、積層体１００の第１角１０６ａから外装材２００の第１領域２３２にかけて第１部分２１０と第２部分２２０の間の間隔が狭くなることで外装材２００に生じる歪みに起因している。 By bonding the first portion 210 and the second portion 220 in the first region 232, a ridge 204a (first ridge) is formed in the first portion 210. The ridge 204a extends from the first angle 106a to the first region 232. The width of the ridge 204a becomes narrower as the distance from the first angle 106a increases. The ridge 204a is caused by the distortion generated in the exterior material 200 due to the narrowing of the distance between the first portion 210 and the second portion 220 from the first corner 106a of the laminated body 100 to the first region 232 of the exterior material 200. There is.

第１領域２３２における第１部分２１０及び第２部分２２０の貼り合わせによって、第１部分２１０の隆起２０４ａと同様にして、第２部分２２０にも隆起２０４ａの反対側に隆起が形成される。 By bonding the first portion 210 and the second portion 220 in the first region 232, a ridge is formed on the opposite side of the ridge 204a in the second portion 220 in the same manner as the ridge 204a in the first portion 210.

図４に示すように、第３領域２３６において外装材２００の第１部分２１０及び第２部分２２０を貼り合わせる。第３領域２３６は、積層体１００の第３側面１０４ｃに沿っている。このようにして、第１部分２１０の隆起２０４ａと同様にして、隆起２０４ｂ（第２隆起）が第１部分２１０に形成される。隆起２０４ｂは、第２角１０６ｂから第３領域２３６にかけて延伸している。隆起２０４ｂの幅は、第２角１０６ｂから遠ざかるほど狭くなっている。 As shown in FIG. 4, the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in the third region 236. The third region 236 is along the third side surface 104c of the laminated body 100. In this way, the ridge 204b (second ridge) is formed in the first portion 210 in the same manner as the ridge 204a of the first portion 210. The ridge 204b extends from the second corner 106b to the third region 236. The width of the ridge 204b becomes narrower as it goes away from the second angle 106b.

第３領域２３６における第１部分２１０及び第２部分２２０の貼り合わせによって、第１部分２１０の隆起２０４ｂと同様にして、第２部分２２０にも隆起２０４ｂの反対側に隆起が形成される。 By bonding the first portion 210 and the second portion 220 in the third region 236, a ridge is formed on the opposite side of the ridge 204b in the second portion 220 in the same manner as in the ridge 204b of the first portion 210.

次いで、図５に示すように、積層体１００の第２側面１０４ｂに沿って外装材２００を折り曲げる。図５の一点鎖線は、外装材２００の折り曲げ線に沿った線を示している。外装材２００の折り曲げによって、隆起２０４ａ及び隆起２０４ｂを積層体１００に向けて寄せることができる。外装材２００を折り曲げる理由は、後述する。 Next, as shown in FIG. 5, the exterior material 200 is bent along the second side surface 104b of the laminated body 100. The alternate long and short dash line in FIG. 5 shows a line along the bent line of the exterior material 200. By bending the exterior material 200, the ridges 204a and 204b can be brought toward the laminate 100. The reason for bending the exterior material 200 will be described later.

次いで、図６に示すように、第１部分領域２３４ａ及び第２部分領域２３４ｂにおいて外装材２００の第１部分２１０及び第２部分２２０を貼り合わせる。第１部分領域２３４ａは、積層体１００の第２側面１０４ｂに対して第１角１０６ａの反対側にある。第２部分領域２３４ｂは、積層体１００の第２側面１０４ｂに対して第２角１０６ｂの反対側にある。第１部分領域２３４ａ及び第２部分領域２３４ｂにおいて第１部分２１０及び第２部分２２０を貼り合わせる理由は、後述する。 Next, as shown in FIG. 6, the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in the first partial region 234a and the second partial region 234b. The first partial region 234a is on the opposite side of the first angle 106a with respect to the second side surface 104b of the laminated body 100. The second partial region 234b is on the opposite side of the second corner 106b with respect to the second side surface 104b of the laminated body 100. The reason why the first portion 210 and the second portion 220 are bonded together in the first partial region 234a and the second partial region 234b will be described later.

次いで、図７に示すように、第２領域２３４において外装材２００の第１部分２１０及び第２部分２２０を貼り合わせる。第２領域２３４は、積層体１００の第２側面１０４ｂに沿っている。図７に示す工程では、外装材２００による積層体１００の収容空間の圧力を、大気圧よりも低く、例えば、真空に減圧しながら、第１部分２１０及び第２部分２２０を貼り合わせる。第２領域２３４は、第１部分領域２３４ａ及び第２部分領域２３４ｂと重なってもよいし、又は重なっていなくてもよい。 Next, as shown in FIG. 7, the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in the second region 234. The second region 234 is along the second side surface 104b of the laminated body 100. In the step shown in FIG. 7, the pressure in the accommodation space of the laminated body 100 by the exterior material 200 is lower than the atmospheric pressure, for example, the first portion 210 and the second portion 220 are bonded together while being reduced to a vacuum. The second region 234 may or may not overlap the first partial region 234a and the second partial region 234b.

次いで、外装材２００のうち第２領域２３４の外側部分を除去する。 Next, the outer portion of the second region 234 of the exterior material 200 is removed.

このようにして、電池１０が製造される。 In this way, the battery 10 is manufactured.

図３から図７に示す方法において、第１領域２３２、第２領域２３４及び第３領域２３６における第１部分２１０及び第２部分２２０の貼り合わせは、例えば、第１部分２１０及び第２部分２２０の溶着によって行うことができる。 In the method shown in FIGS. 3 to 7, the bonding of the first portion 210 and the second portion 220 in the first region 232, the second region 234, and the third region 236 is, for example, the first portion 210 and the second portion 220. It can be done by welding.

図３から図７に示す方法によれば、高い信頼性をもって積層体１００を封止することができる。具体的には、この方法においては、図６に示すように、第１部分領域２３４ａにおいて外装材２００の第１部分２１０及び第２部分２２０を貼り合わせている。このようにすることで、図７の減圧の際に隆起２０４ａが第２領域２３４まで広がらないようにすることができる。言い換えると、第１部分領域２３４ａにおける第１部分２１０及び第２部分２２０の貼り合わせは、隆起２０４ａの広がりを制限するためのストッパとして機能している。仮に、隆起２０４ａが第２領域２３４まで広がると、第２領域２３４における第１部分２１０と第２部分２２０を貼り合わせにおいて第２領域２３４に位置する隆起２０４ａを押圧することで、外装材２００の表面に皴（例えば、後述する図８に示す皴２０６）を形成し得る。このような皴は、外装材２００による積層体１００の収容空間から外装材２００の外部の空間に通じるリーク経路を形成し得る。これに対して、図６及び図７に示す例においては、このような皴を抑えることができる。したがって、高い信頼性をもって積層体１００を封止することができる。 According to the method shown in FIGS. 3 to 7, the laminated body 100 can be sealed with high reliability. Specifically, in this method, as shown in FIG. 6, the first portion 210 and the second portion 220 of the exterior material 200 are bonded together in the first partial region 234a. By doing so, it is possible to prevent the ridge 204a from extending to the second region 234 when the pressure is reduced in FIG. 7. In other words, the bonding of the first portion 210 and the second portion 220 in the first partial region 234a functions as a stopper for limiting the spread of the ridge 204a. If the ridge 204a extends to the second region 234, the ridge 204a located in the second region 234 is pressed by bonding the first portion 210 and the second portion 220 in the second region 234 to form the exterior material 200. Wrinkles (for example, wrinkles 206 shown in FIG. 8 described later) can be formed on the surface. Such wrinkles can form a leak path leading from the accommodation space of the laminated body 100 by the exterior material 200 to the space outside the exterior material 200. On the other hand, in the examples shown in FIGS. 6 and 7, such wrinkles can be suppressed. Therefore, the laminated body 100 can be sealed with high reliability.

図３から図７に示す方法によれば、外装材２００の第１部分２１０及び第２部分２２０に歪み２０２ａ（歪み２０２ｂ）が形成される。具体的には、この方法においては、上述したように、隆起２０４ａが第２領域２３４まで広がらない。それにもかかわらず隆起２０４ａを平坦化するように第２領域２３４において第１部分２１０及び第２部分２２０を貼り付けると、隆起２０４ａを解消するように歪み２０２ａが形成される。歪み２０２ａそのものは、外装材２００による積層体１００の収容空間から外装材２００の外部の空間に通じるリーク経路を形成し得ない。したがって、高い信頼性をもって積層体１００を封止することができる。 According to the method shown in FIGS. 3 to 7, strain 202a (strain 202b) is formed in the first portion 210 and the second portion 220 of the exterior material 200. Specifically, in this method, as described above, the ridge 204a does not extend to the second region 234. Nevertheless, when the first portion 210 and the second portion 220 are attached in the second region 234 so as to flatten the ridge 204a, a strain 202a is formed so as to eliminate the ridge 204a. The strain 202a itself cannot form a leak path leading from the accommodation space of the laminated body 100 by the exterior material 200 to the space outside the exterior material 200. Therefore, the laminated body 100 can be sealed with high reliability.

図３から図７に示す方法によれば、外装材２００による積層体１００の収容空間を小さくすることができる。具体的には、この方法においては、図５に示すように、積層体１００の第２側面１０４ｂに沿って外装材２００を折り曲げて、隆起２０４ａ及び隆起２０４ｂを積層体１００に向けて寄せている。第２領域２３４における皴を抑えるためには、隆起２０４ａ及び隆起２０４ｂを第２領域２３４、第１部分領域２３４ａ及び第２部分領域２３４ｂに重ねないようにする必要がある。したがって、隆起２０４ａ及び隆起２０４ｂが積層体１００の第２側面１０４ｂに寄っているほど、第２領域２３４を積層体１００の第２側面１０４ｂに寄せることができる。したがって、外装材２００による積層体１００の収容空間を小さくすることができる。 According to the method shown in FIGS. 3 to 7, the accommodation space of the laminated body 100 by the exterior material 200 can be reduced. Specifically, in this method, as shown in FIG. 5, the exterior material 200 is bent along the second side surface 104b of the laminated body 100, and the raised 204a and the raised 204b are brought toward the laminated body 100. .. In order to suppress wrinkles in the second region 234, it is necessary to prevent the ridges 204a and 204b from overlapping the second region 234, the first partial region 234a and the second partial region 234b. Therefore, the closer the ridges 204a and 204b are to the second side surface 104b of the laminate 100, the closer the second region 234 can be to the second side surface 104b of the laminate 100. Therefore, the accommodation space of the laminated body 100 by the exterior material 200 can be reduced.

他の例に係る方法は、図５に示す工程を含んでいなくてもよい。この例においては、図４に示す工程が行われた後、図５に示す工程を経ないで、図６に示す工程が行われる。この例においても、隆起２０４ａ及び隆起２０４ｂをそれぞれ第１部分領域２３４ａ及び第２部分領域２３４ｂに重ねないようにすることで、第２領域２３４における皴を抑えることができる。 The method according to another example may not include the step shown in FIG. In this example, after the step shown in FIG. 4 is performed, the step shown in FIG. 6 is performed without going through the step shown in FIG. In this example as well, wrinkles in the second region 234 can be suppressed by preventing the ridges 204a and 204b from overlapping the first partial region 234a and the second partial region 234b, respectively.

図８は、図２の変形例を示す図である。変形例に係る電池１０は、以下の点を除いて、実施形態に係る電池１０と同様である。 FIG. 8 is a diagram showing a modification of FIG. 2. The battery 10 according to the modified example is the same as the battery 10 according to the embodiment except for the following points.

図８に示す例において、電池１０は、図６に示す工程を経ないで製造されている。図８に示す例において、外装材２００は、皴２０６を含んでいる。図３から図７を用いて説明したように、皴２０６は、隆起２０４ａが第２領域２３４まで広がった状態で第２領域２３４において第１部分２１０及び第２部分２２０を貼り合わせることで形成される。 In the example shown in FIG. 8, the battery 10 is manufactured without going through the process shown in FIG. In the example shown in FIG. 8, the exterior material 200 contains wrinkles 206. As described with reference to FIGS. 3 to 7, the wrinkle 206 is formed by laminating the first portion 210 and the second portion 220 in the second region 234 in a state where the ridge 204a extends to the second region 234. NS.

図８に示す例においても、歪み２０２ａが形成されている。図６に示した第１部分領域２３４ａにおいて第１部分２１０及び第２部分２２０を貼り合わせなくても、積層体１００の第２側面１０４ｂに近接した領域で外装材２００の第１部分２１０及び第２部分２２０を貼り合わせることで、隆起２０４ａの一部分を解消するように歪み２０２ａが形成される。 Also in the example shown in FIG. 8, strain 202a is formed. In the first partial region 234a shown in FIG. 6, even if the first portion 210 and the second portion 220 are not bonded to each other, the first portion 210 and the first portion 210 of the exterior material 200 are located in a region close to the second side surface 104b of the laminated body 100. By laminating the two portions 220, the strain 202a is formed so as to eliminate a part of the ridge 204a.

図８に示す例においても、外装材２００による積層体１００の収容空間を小さくすることができる。 Also in the example shown in FIG. 8, the accommodation space of the laminated body 100 by the exterior material 200 can be reduced.

以上、図面を参照して本発明の実施形態について述べたが、これらは本発明の例示であり、上記以外の様々な構成を採用することもできる。 Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations other than the above can be adopted.

この出願は、２０１８年５月１６日に出願された日本出願特願２０１８−０９４６９０号を基礎とする優先権を主張し、その開示の全てをここに取り込む。 This application claims priority on the basis of Japanese application Japanese Patent Application No. 2018-094690 filed on May 16, 2018, and incorporates all of its disclosures herein.

Claims (3)

第１電極、第２電極及びセパレータを含み、第１面と、前記第１面の反対側の第２面と、前記第１面と前記第２面の間にあって、第１リードが形成された第１側面と、前記第１側面に交わる第２側面と、前記第１側面の反対側の第３側面と、前記第２側面の反対側の第４側面と、前記第１側面と前記第２側面の間の第１角と、を有する積層体と、
前記積層体の前記第１面から前記第４側面を経由して前記第２面にかけて折り返されており、前記積層体の前記第１側面及び前記第２側面の外側で貼り合わされた第１部分及び第２部分と、を有する外装材と、
を含み、
前記外装材の前記第１部分及び前記第２部分は、前記積層体の前記第１角から延伸する第１歪みを有する、電池。A first lead was formed between the first surface, the second surface opposite the first surface, and the first surface and the second surface, including the first electrode, the second electrode, and the separator. The first side surface, the second side surface intersecting the first side surface, the third side surface on the opposite side of the first side surface, the fourth side surface on the opposite side of the second side surface, the first side surface and the second side surface. A laminate having a first corner between the sides, and
A first portion of the laminated body, which is folded back from the first surface to the second surface via the fourth side surface and bonded to the outside of the first side surface and the second side surface of the laminated body, and The second part, the exterior material with, and
Including
A battery in which the first portion and the second portion of the exterior material have a first strain extending from the first corner of the laminate. 請求項１に記載の電池において、
前記積層体の前記第３側面には、第２リードが形成されており、
前記積層体は、前記第３側面と前記第２側面の間の第２角を有しており、
前記外装材の前記第１部分及び前記第２部分は、前記積層体の前記第３側面の外側で貼り合わされており、
前記外装材の前記第１部分及び前記第２部分は、前記積層体の前記第２角から延伸する第２歪みを有する、電池。In the battery according to claim 1,
A second lead is formed on the third side surface of the laminated body.
The laminate has a second angle between the third side surface and the second side surface.
The first portion and the second portion of the exterior material are bonded to each other on the outside of the third side surface of the laminate.
A battery in which the first portion and the second portion of the exterior material have a second strain extending from the second corner of the laminate. 請求項１又は２に記載の電池において、
前記積層体は、前記第１面と前記第２面の間に５．０ｍｍ以上の厚さを有する、電池。In the battery according to claim 1 or 2.
The laminated body is a battery having a thickness of 5.0 mm or more between the first surface and the second surface.
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