Patent ID: 8381829

Claim:
A battery device comprising: a first cell group and a second cell group each having a plurality of cells connected in series; a first housing container for housing the first cell group and a second housing container for housing the second cell group; first current detector for detecting a current to flow through said first cell group, and second current detector for detecting a current to flow through said second cell group; first cell number detector for detecting a number of cells of first cell group, and second cell number detector for detecting a number of cells of second group; a first switching element connected with said first cell group for turning ON/OFF a current to flow through said first cell group and a second switching element connected with said second cell group for turning ON/OFF a current to flow through said second cell group; first controller for controlling the ON/OFF of said first switching element with the output signal of said first current detector, and second controller for controlling the ON/OFF of said second switching element with the output signal of said second current detector; a pair of first discharge terminals formed on one of confronting face of said first and second housing containers and connected with positive and negative terminals of the respective cell groups; a pair of second discharge terminals formed on the other confronting faces of said first and second housing containers, and connected with the positive and negative terminals of the respective cell groups; first and second cell number terminals formed on the one of confronting faces of the first and second housing containers; third cell number terminal formed on the other of confronting faces of the first and second housing containers; wherein the first cell number terminal of the first cell group is connected to the first cell number detector and the first cell number terminal of the second cell group is connected to the second cell number detector, and wherein the third cell number terminal of the first cell group is connected to the first cell number terminal of the second cell group, and is connected to the second cell number terminal of the first cell group.