Battery
A battery and battery cell technology, applied in secondary batteries, battery electrodes, lithium batteries, etc., can solve the problems of increasing the energy density of the battery, and the difficulty of leading out the positive terminal or negative terminal, so as to prevent water from penetrating into the battery. Effect
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no. 1 example
[0019] FIG. 1 shows an exploded view of a secondary battery according to a first embodiment of the present invention. This secondary battery includes a battery cell 10 housed in a film-shaped packaging member 20 folded into two. The package component 20 is sealed at a sealing portion 20A provided in an edge portion of the package component 20 . The sealing width W of the sealing portion 20A is preferably within a range of 1-5 mm (1 mm and 5 mm inclusive), more preferably within a range of from 1 mm to less than 3 mm. If the sealing width W is too narrow, it is difficult to completely seal the package part 20, but if the sealing width W is too wide, both the volume and the weight of the battery increase, whereby the energy density of the battery decreases.
[0020] FIG. 2 shows a cross-sectional view of the package component 20 shown in FIG. 1 . The packaging part 20 is composed of a layered film, including a metal layer 21, a resin layer 23 disposed on the side of the metal ...
no. 2 example
[0054] 4 shows a cross-sectional view of a secondary battery packaging part according to a second embodiment of the present invention. The secondary battery according to this embodiment is the same as the battery according to the first embodiment except that the packaging member 40 is used instead of the packaging member 20 . Therefore, the same components are denoted by the same reference numerals as those of the first embodiment, and no further description will be given.
[0055] Encapsulation component 40 is identical to encapsulation component 20 except that adhesive layer 22 is replaced by thermoplastic layer 42 . Like the adhesive layer 22, the thermoplastic layer 42 joins the metal layer 21 and the resin layer 23 together, and is composed of a thermoplastic resin. For thermoplastic resins, modified polyolefin resins can be used. As the modified polyolefin resin, carbonyl functional group-containing modified polyethylene such as maleic anhydride-modified polyethylene a...
example
[0061] Next, specific examples of the present invention will be described in detail below.
[0062] (Examples 1-1 to 1-12)
[0063] The secondary battery described in the first embodiment was formed. First, a package component 20 having a size of 70 mm×70 mm for each of Examples 1-1 to 1-12 was formed through the following steps. First, after bonding nylon to one side of a 40-μm-thick aluminum foil with a polyurethane adhesive, a 1-μm-thick acrylic adhesive was applied to the other side of the aluminum foil so that the 30-μm-thick polypropylene that could be thermally fused The film is bonded to this aluminum foil. In other words, the package member 20 is formed, which includes a metal layer 21 made of aluminum, a resin layer 23 made of polypropylene disposed on the metal layer 21, an adhesive bond composed of an acrylic adhesive sandwiched therebetween. The agent layer 22 and the resin layer 25 made of nylon provided on the other side of the metal layer 21 opposite to the ...
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Abstract
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