Patent ID: 9705350
Date: 2017-07-11
CPC Classifications: H01M,H02J,Y02E

Claim:
1. A power storage system comprising: at least two battery units mutually connected in parallel, the battery units each including: at least one battery charger configured to supply charge current to each of the battery units; and at least one power storage control device configured to control a charge current value that is supplied to each of the battery units, wherein the power storage control device is configured to decrease the charge current value in accordance with the charge state of each of the battery units, wherein each of the battery units includes an interruption device configured to interrupt connection with the battery charger in a case in which a voltage reaches an upper limit voltage value, wherein the power storage control device is configured to decrease the charge current value in a case in which a voltage of any one of the battery units becomes a specific voltage value that is smaller than the upper limit voltage value, and wherein, until it is detected that the voltage of one of the battery units becomes the specific voltage value first, the power storage control device keeps causing the battery charger to supply a constant current, and after it is detected that the voltage of one of the battery units becomes the specific voltage value first, the power storage control device adjusts a current value that is supplied by the battery charger in a manner that the charge current value that is supplied to each of the battery units is set to be lower than or equal to the constant current value.