Patent ID: 8217658

Claim:
A prismatic battery short circuit inspection method for executing a short circuit inspection of a prismatic battery, the prismatic battery having a battery unit comprising: an electrode plate group composed of a plurality of square-shaped positive electrode plates and negative electrode plates stacked via separators in which side edge portions of the electrode plates on the opposite sides are protruded from facing areas of both the electrode plates; and current collectors having lead portion joint surfaces, which are respectively provided corresponding to lead portions of positive electrode plates and negative electrode plates in sides of the electrode plate group, face end portions of the lead portions, and have at least a part to be welded and fixed to the lead portions, and bent portions bent from side edges of respective lead portion joint surfaces to lie over outer surfaces of the electrode plate group in a stack direction of the positive electrode plates and the negative electrode plates, and the method comprising: housing the battery unit in a metallic battery case with an insulation resistance intervening between the battery case and the bent portions in at least the current collector which has a polarity opposite to the battery case, applying pressure from outer surfaces of the battery case to positions corresponding to the bent portions in at least the current collector which has the polarity opposite to the battery case, so as to cause a projected object to break through the insulation resistance between the battery case and the bent portions when the projected object exists on the bent portions; and executing a short circuit inspection between the battery case and the current collector under the pressure.