To improve efficiency of current collecting of a lithium secondary battery and make the lithium secondary battery maltiply functional.
This battery is structured comprising a conductive layer 1 of lithium ion, a negative electrode, a positive electrode and a battery casing 6. The negative electrode comprises a negative electrode active material layer 4, which can store and eject lithium placed contacting with the conductive layer 1, and a negative electrode collector substrate 5 holding the negative electrode active material layer 4. The positive electrode comprises a positive electrode active material layer 2, which can store and eject lithium placed contacting with a side of the conductive layer 1 opposite to a side contacting the negative electrode active material layer 4, and a positive electrode collector substrate 3 holding the positive electrode active material layer 2. The battery casing 6 accommodates the conductive layer 1 of lithium ion, the positive electrode and the negative electrode. A positive terminal 7 and a negative terminal 8 having a plurality of points are provided on an outer surface of the battery casing 6. The positive terminal 7 and the negative terminal 8 are connected to the positive electrode collector substrate 3 and the negative electrode collector substrate 5, respectively, via a conductor filled in via holes formed in the battery casing 6. An electric circuit connected to the positive terminal 7 or the negative terminal 8 is provided on the outer surface of the battery casing 6.
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KATAYAMA HIDEAKI
AKABOSHI HARUO
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