The Prius' battery is made in Japan in by Panasonic EV Energy, a joint venture company partially owned by Panasonic with Toyota having the majority.
Company Name: Panasonic EV Energy Co., Ltd.
Head Quarters: 20 Okasaki, Kosai, Shizuoka, 431-0422 Japan
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Omori Factory: 20 Okasaki, Kosai, Shizuoka, 431-0422 Japan
Sasaijuku Factory: 555 Sakaijuku, Kosai, Shizuoka, 431-0452 Japan
Description of Business: Development, Manufacturing and Sales of Nickel metal-hydride and Lithium ion rechargeable batteries and Battery management systems for HEVs and PEVs.
A third factory will be opening up in the Taiwa-cho area of Japan.
You can read about the environmental impact of the Prius by going to
http://www.toyota.co.jp/ and searching for Prius environmental report
Panasonic EV Energy http
Panasonic EV Energy http