Patent attributes
Provided is a battery cell stack in which the electrical resistance between a current collector plate and an end bipolar plate is unlikely to increase when charging and discharging are repeated. A battery cell stack includes a current collector plate electrically connected to each of a pair of end bipolar plates located at both ends in the stacking direction. In the battery cell stack, two members in contact with each other between the current collector plate and the end bipolar plate are made of materials such that, when an accelerated test satisfying the following conditions 1 to 3 is performed, the electrical resistance value between the current collector plate and the end bipolar plate after the accelerated test is 1.05 times or less the electrical resistance value between the current collector plate and the end bipolar plate before the accelerated test:Condition 1 is that a cycle includes applying pressure over one minute to achieve a predetermined pressure, maintaining the predetermined pressure for one minute, and bringing the predetermined pressure back to the atmospheric pressure over one minute;Condition 2 is that the predetermined pressure is set to be the atmospheric pressure +0.1 MPa; andCondition 3 is that the number of cycles is set to 18.
