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4-Traders Homepage  >  Equities  >  Tokyo  >  Toppan Printing Co Ltd    7911   JP3629000005

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Toppan Printing : Researchers Submit Patent Application, "Secondary Battery Packaging Material and Secondary Battery", for Approval (USPTO 20170346047)

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12/14/2017 | 07:35pm CET

By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor MUROI, Yuki (Tokyo, JP), filed on August 21, 2017, was made available online on December 7, 2017.

The patent's assignee is Toppan Printing Co. Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "In recent years, secondary batteries which are extremely thin and small have been under active development as power storage devices for use in personal computers, or mobile terminals, such as mobile phones, or for use in video cameras, satellites, vehicles, and other devices. As packaging materials used for such batteries, attention is being given to laminated packaging materials formed of a multi-layer film (e.g. packaging materials having a laminate configuration of base material layer/first adhesive layer/metal foil layer/second adhesive layer/heat-sealing resin layer). Laminated packaging materials formed of a multi-layer film are superior to conventional metal cans used as containers for battery elements, in that the materials have light weight and high heat dissipation, and allow for free selection of shape.

"Secondary batteries are manufactured, for example, by forming a recess, using cold molding, on a part of a secondary battery packaging material formed of a multi-layer film, accommodating battery contents (positive electrode, separator, negative electrode, electrolyte solution, and other elements) in the recess, folding back the remaining part of the packaging material where the recess is not formed, and hermetically heat-sealing the edge portions, with the electrode terminals extending from the positive and negative electrodes sandwiched between the edge portions (hereinafter, such a battery may also be referred to as single-sided battery). In recent years, other types of secondary batteries have been manufactured, being provided with a packaging material in which a recess is formed on both sides thereof and bonded together to thereby efficiently accommodate more contents, for enhancement of energy density (hereinafter, such a battery may also be referred to as double-sided battery). To obtain high energy density with such secondary batteries, a deeper recess is required to be formed. However, a deep recess is prone to cause pin holes or breakage at the edge portions or corner portions of the recess where the degree of stretching is high in molding using a die.

"To reduce the occurrence of pin holes or breakage in deeply molding a recess (in deep drawing), PTL 1, for example, describes protecting a metal foil by using a film, such as a stretched polyamide film or stretched polyester film, as a base material layer of the secondary battery packaging material."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "Technical Problem

"It is true that the technique described in PTL 1 can provide moldability; however, an unstretched film, which is located on the inner side of the metal foil layer in manufacturing the battery, is fused and thinned when heat-sealed, and the battery elements, such as a positive electrode and a negative electrode, or electrode terminals, are prone to become electrically connected to the metal foil layer, causing a disadvantage of impairing insulation properties. In the configuration described in PTL 1, the packaging material may suffer from warpage after being formed. The warpage occurring after the packaging material being formed is a cause of impairing the performance or processability of the packaging material.

"However, when the layer located on the inner side of the metal foil layer is too thick, moisture may penetrate into the battery, react with the battery contents or the like, and produce a substance, such as hydrofluoric acid, causing possible corrosion of the battery elements or the metal foil layer.

"The present invention has been made in view of the above disadvantages, and has an object to provide a secondary battery packaging material that can reduce degradation in insulation properties while keeping moldability and moisture barrier properties, and can reduce warpage after being formed, and to provide a secondary battery using the secondary battery packaging material.

"Solution to Problem

"The present invention provides a secondary battery packaging material having at least a metal foil layer, a second base material layer, and a heat-sealing resin layer laminated in this order on a first surface of a first base material layer. In the secondary battery packaging material, the second base material layer is laminated directly on the metal foil layer or via only an anti-corrosion treatment layer, the first base material layer is formed of a resin composite containing a thermosetting resin or a thermoplastic resin, and the second base material layer is formed of a resin composite containing a thermosetting resin.

"In the secondary battery packaging material, it is preferred that the metal foil layer is directly laminated on the first surface of the first base material layer. With this configuration of the secondary battery packaging material, the amount of moisture penetrating from the end portions of the packaging material can be further reduced, and the thickness of the overall packaging material can be further reduced, thereby making the secondary battery thinner and smaller.

"In the secondary battery packaging material, it is preferred that the first base material layer has a thickness in a range of 5 .mu.m or more to 30 .mu.m or less, and the second base material layer has a thickness in a range of 5 .mu.m or more to 30 .mu.m or less. It is preferred that a difference in thickness between the first base material layer and the second base material layer is 15 .mu.m or less.

"In the secondary battery packaging material, it is preferred that the first base material layer and the second base material layer are formed of the same resin material. With this configuration of the secondary battery packaging material, the amount of warpage after molding can be further reduced.

"In the secondary battery packaging material, it is preferred that the metal foil layer has a thickness in a range of 20 .mu.m or more to 80 .mu.m or less. When the thickness of the metal foil layer falls in that range, moldability and energy density are balanced better.

"In the secondary battery packaging material, it is preferred that a coating layer that contains a lubricant made of fatty amide is formed on a second surface of the first base material layer or on a surface of the heat-sealing resin layer. With this configuration of the secondary battery packaging material includes, moldability can be further improved.

"The present invention provides a secondary battery including battery elements and the secondary battery packaging material described above.

"Advantageous Effects of the Invention

"The present invention can provide a secondary battery packaging material and a secondary battery that can reduce degradation of insulation properties while keeping moldability and moisture barrier properties, and can reduce warpage after being formed."

For additional information on this patent application, see: MUROI, Yuki. Secondary Battery Packaging Material and Secondary Battery. Filed August 21, 2017 and posted December 7, 2017. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220170346047%22.PGNR.&OS=DN/20170346047&RS=DN/20170346047

Keywords for this news article include: Toppan Printing Co. Ltd.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2017, NewsRx LLC

(c) 2017 NewsRx LLC, source Government & Education Newsletters

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Financials ( JPY)
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EBIT 2018 -
Net income 2018 37 700 M
Finance 2018 121 B
Yield 2018 1,97%
P/E ratio 2018 17,28
P/E ratio 2019 15,22
EV / Sales 2018 0,39x
EV / Sales 2019 0,37x
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Shingo Kaneko President & Representative Director
Naoki Adachi Chairman
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Taro Izawa MD, GM-Business Development & Research
Hideharu Maro Senior Managing Director & GM-Corporate Planning
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