Mitsui Chemicals Tohcello, Inc.

Masaaki Odoi

Shigenobu Ikenaga

Fumito Takeuchi

Tomoaki Ito

Nobuhiro Maruko

Kazuhiro Yarimizu

Kaoru Ohshimizu

A sheet set for encapsulating a solar battery including a first encapsulating sheet and a second encapsulating sheet which are disposed between a light-incident surface protective member and a back surface protective member, and are used to encapsulate solar battery elements is provided. When the first encapsulating sheet and the second encapsulating sheet are subjected to a heating and pressurization treatment in which the first encapsulating sheet and the second encapsulating sheet are heated and depressurized under defined conditions, a volume resistivity of the first encapsulating sheet measured under defined conditions, is higher than a volume resistivity of the second encapsulating sheet. The first encapsulating sheet is disposed between the light-incident surface protective member and the solar battery elements. The second encapsulating sheet has at least one polar group selected from a carboxyl group, an ester group, a hydroxyl group, an amino group, and an acetal group.

Sheet set for encapsulating solar battery

The encapsulating material for solar cell is an encapsulating material for solar cell including an ethylene/&#x3b1;-olefin copolymer and an organic peroxide having a one-minute half-life temperature in a range of 100&#xb0; C. to 170&#xb0; C. In addition, the complex viscosity of the encapsulating material for solar cell has the minimum value (&#x3b7;) of the complex viscosity at a temperature in a range of 100&#xb0; C. to lower than 135&#xb0; C., the minimum value (&#x3b7;) of the complex viscosity is in a range of 6.0&#xd7;10Pa&#xb7;s to 4.0&#xd7;10Pa&#xb7;s, the complex viscosity (&#x3b7;) of the encapsulating material for solar cell at 150&#xb0; C. is in a range of 2.0&#xd7;10Pa&#xb7;s to 1.0&#xd7;10Pa&#xb7;s, and the content of the organic peroxide in the encapsulating material for solar cell is in a range of 0.1 parts by weight to 3 parts by weight with respect to 100 parts by weight of the ethylene/&#x3b1;-olefin copolymer.

Encapsulating material for solar cell and solar cell module

An encapsulating material for solar cell is made of a resin composition containing a crosslinkable resin, and satisfies the following 1) and 2). 1) When the encapsulating material for solar cell is immersed in acetone at 23&#xb0; C. for one hour after a crosslinking treatment in which the encapsulating material for solar cell is heated and depressurized at 150&#xb0; C. and 250 Pa for three minutes, and then is heated and pressurized at 150&#xb0; C. and 100 kPa for 15 minutes, an acetone-absorbing ratio is in a range of 3.5 weight % to 12.0 weight % with respect to the weight of the above-described crosslinking-treated encapsulating material for solar cell. 2) A volume resistivity of the above-described crosslinking-treated encapsulating material for solar cell, which is based on JIS K6911 and measured at a temperature of 100&#xb0; C. with an applied voltage of 500 V, is in a range of 1.0&#xd7;10&#x3a9;&#xb7;cm to 1.0&#xd7;10&#x3a9;&#xb7;cm.

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Hitachinaka, Japan

Masaaki Odoi