| 摘要 |
PURPOSE:To reduce diversity in battery capacity by making bulk density and grain size of spherical amalgam zinc powder to be used for a negative electrode those prescribed so as to improve weighing accuracy thereof. CONSTITUTION:Amalgam zinc powder has its bulk density in the range 5 to 4.5g/cc and its grain size in the range 40 to 150Mesh while a difference of the upper limit value and the lower limit value of grain size is in the range of 40Mesh. Weighing of the amalgam zinc powder to be used for one battery is so performed that the amalgam zinc powder dropping of itself from the bottom of a hopper is cut by rubbing with a weighing plate having a hole of fixed volume in order to measure the volume to be filled in this hole. The amalgam zinc powder is cut by rubbing causing no unevenness on its upper layer surface part always flatwise at the hopper bottom part so that weighing diversity is suppressed. Thereby, a negative electrode having correct volume is secured so that diversity in battery capacity can be suppressed. |
