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Oct 1, 2009

Panasonic Develops High Energy Lithium-ion Battery Module with High Reliability

The new module offers energy storage solutions for clean energy development
A prototype will be on display at CEATEC JAPAN 2009

Osaka, Japan - Panasonic Corporation has developed a 1.5 kWh battery module from 18650-type (18 mm in diameter x 65 mm in length) lithium-ion battery cells, which are widely used in laptop computers, to provide energy storage solutions for a wide range of environmentally friendly energy technologies. For example, multiple units can be connected in series and/or parallel to store energy generated by home-use photovoltaic (PV) systems and fuel cells, and power electric vehicles (EV). A prototype of the new module will be shown at CEATEC JAPAN 2009 (Makuhari Messe, October 6-10, 2009) and New Energy Industry Fair Osaka (Intex Osaka, October 7-9, 2009).

Amid rising environmental concerns such as CO2 emissions, great expectations are placed on widespread use of renewable energy technologies such as photovoltaics and commercialization of electric vehicles to alleviate the concerns. However, these technologies require storage systems to become commonplace in daily life. Among a number of energy storage technologies, storage systems using lithium-ion batteries in particular are considered promising and practical, because such systems are lighter and have greater capacity than those using other types of rechargeable batteries.

As applications of the storage systems using lithium-ion batteries increase, there will arise demand for such systems with higher capacity, output, reliability and safety as well as improved cost performance. Flexibility in voltage and capacity will also be required according to the application.

Panasonic's compact and high-energy battery module meets such demands. The module having a volume of approximately 7 L and weighing 8 kg has a voltage of 25.2 V and a capacity of 58 Ah. By connecting a plurality of this module, users can construct battery packs for a variety of applications such as home electricity storage and electric vehicles.

The high-energy module is constructed from 140 pieces of 18650-type lithium-ion battery cells - seven serially connected rows with each row made of 20 parallel connected battery cells. This structure allows for avoiding serious loss in the system performance such as system shutdown even if some individual cells fail.

Panasonic has a proven record in the production of the 18650-type lithium-ion batteries which are highly reliable and safe, and offer good cost performance. The company has already developed and commercialized a 18650-type lithium-ion battery which has the industry's highest level of capacity.

To achieve the innovative module, Panasonic employed a high-capacity and high-durability cell technology using its proprietary nickel-based positive electrode material1. Other technologies used include its cell safety technology that uses a heat-resistant insulating layer2 between the positive and negative electrodes to prevent short circuits and thermal runaway (overheating) which can be caused when foreign particles get mixed into the battery cell. The new module also uses Panasonic's design technology to ensure reliability by minimizing the effects on power supply if a trouble occurs in some of the cells contained in the module.

On the new battery module, Panasonic holds 38 patents in Japan and 22 in other countries including pending applications.

More information on Panasonic's batteries is available at http://panasonic.net/corporate/segments/ec/.

Notes:

1) Panasonic's own positive electrode material based on LiNiO2 that has high capacity and excellent durability.
2) A metal oxide insulation layer which resists heat.

About Panasonic

Panasonic Corporation is a worldwide leader in the development and manufacture of electronic products for a wide range of consumer, business, and industrial needs. Based in Osaka, Japan, the company recorded consolidated net sales of 7.77 trillion yen (US$78.4 billion) for the year ended March 31, 2009. The company's shares are listed on the Tokyo, Osaka, Nagoya and New York (NYSE: PC) stock exchanges. For more information on the company and the Panasonic brand, visit the company's website at http://panasonic.net.

Media Contacts:

Akira Kadota, International PR
Panasonic Corporation
Tel: 03-6403-3040 Fax: 03-3436-6766
Panasonic News Bureau
Tel: 03-3542-6205 Fax: 03-3542-9018
*The content in the following news releases is accurate at the time of publication but may be subject to change without notice. Please note therefore that these documents may not always contain the most up-to-date information.

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