Leads with insulating resin film

Abstract

To provide a lead with an insulating resin film with which, when applied to a battery, it is possible to eject a gas generated in a region sealed by the outer packaging of the battery to the outside of the region sealed by the outer packaging.SOLUTION: Provided is a lead with an insulating resin film comprising a conductor and an insulating resin film, wherein, when an axis extending along two sides facing each other is defined as an axis X and an axis crossing the axis X is defined as an axis Y with the conductor viewed from above, the insulating resin film is disposed so as to cover the conductor crossing it along the axis X and not to cover both ends of the conductor that are along the axis Y so as to extend off both ends of the conductor and overlap. The insulating resin film has a first layer being in contact with the conductor, and a second layer. The second layer includes a base resin composed primarily of polypropylene, and one or more kinds of additive component selected from a rubber component and an elastomer component. The melting point of the base resin is 110°C to 130°C inclusive, and the softening point of the additive component is 130°C or below. The second layer contains 10 mass% to 40 mass% inclusive of the additive component.SELECTED DRAWING: Figure 3A

Claims

[Claim 1] A plate-shaped conductor having a rectangular shape on its upper and lower surfaces, The insulating resin film includes a first insulating resin film disposed on the upper surface of the conductor and a second insulating resin film disposed on the lower surface of the conductor, When the conductor is viewed from above along the vertical direction of the upper surface, and the axis along the two selected opposing sides is defined as the X-axis, and the axis perpendicular to the X-axis is defined as the Y-axis, The first insulating resin film and the second insulating resin film are arranged to cover the conductor across the X-axis, overlapping and extending beyond both ends of the conductor, and not covering the ends of the conductor along the Y-axis. The first insulating resin film and the second insulating resin film each comprise a plurality of layers with different compositions. The first insulating resin film and the second insulating resin film each consist of only two or three layers. The first insulating resin film and the second insulating resin film each have a first layer in contact with the conductor and a second layer separate from the first layer. The second layer comprises a base resin mainly composed of polypropylene and one or more additive components selected from rubber components and elastomer components. The melting point of the base resin is 110°C or higher and 128°C or lower, and the softening point of the additive component is 130°C or lower. The base resin of the second layer is crosslinked, The second layer contains the additive component in a proportion of 10% by mass or more and 40% by mass or less. The aforementioned additive component is one or more selected from ethylene propylene rubber, butyl rubber, ethylene propylene-diene rubber, styrene-butadiene rubber, urethane rubber, silicone rubber, natural rubber, and acrylic rubber, and is a lead with an insulating resin film.

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