L1022 battery

　　The advantages of control technology demonstrated by “L1022 battery”

　　We will strengthen the power storage business as another pillar of our energy business after solar cells, consumer rechargeable batteries, and vehicle rechargeable batteries. Panasonic expects the global electricity storage market to reach approximately 2 trillion yen in fiscal 2020. Our sales in fiscal 2011 were approximately 10 billion to 20 billion yen, and our goal is to first increase this to 50 billion yen in fiscal 2015.

　　The reason why the power storage business is worth looking forward to is that in addition to market growth, it can also produce technology that can "freely use batteries". The large-scale power storage system we provide includes a power storage module equipped with 312 18650-size cylindrical lithium-ion rechargeable battery units, and a battery control unit that controls the linkage and charge and discharge with the system. With appropriate combinations, it can support multiple scale (Figure C-1).

　　Figure C-1: Storage module control technology plays a core role

　　The large-scale power storage system business utilizes power storage modules in which cylindrical lithium-ion rechargeable batteries are arranged. Technology that controls the charge and discharge of a large number of power storage modules and their linkage with the system will help differentiate products.

　　The 1.5MWh power storage system (commonly known as "megawatt battery") installed in the vehicle-mounted rechargeable battery factory "Kasai Green Energy Park" uses a combination of approximately 1,000 power storage modules. The battery control unit group designed to allow multiple modules to operate in conjunction can manage the charging and discharging of each battery while observing the actions of more than 300,000 batteries in total. As a result, the entire battery can be used as one virtual large battery. Although the performance of the built-in lithium-ion rechargeable battery is also important, we have an advantage in control technology. Regarding battery control of power storage systems, we have applied for 71 patents in Japan alone.

　　Currently, self-produced lithium-ion rechargeable batteries are used. Of course, external procurement should also be included in the selection. However, it is also an indisputable fact that close information exchange with the rechargeable battery business unit has contributed to the accumulation of battery control technology. In the second half of 2013, it plans to put into production a power storage system using vehicle-mounted lithium-ion rechargeable batteries. By then, battery control technology will also need to change. As batteries continue to advance, our advantages in the battery business can be applied to the power storage system business.

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