Abstract:The influence of battery formula and technology parameter on the safety performance of mercury-free alkaline Zn/MnO2 button cell was explored. Short circuit test and overdischarge test were used to study the safety performance of battery produced with varied formula and technology parameter. The factors affecting the safety performance of battery were studied. The optimal technology parameters are confirmed as follows: capacity ratio of anode to cathode is 0.9׃1, KOH electrolyte content is 43% (mass fraction), content of Zn22- dissolved in KOH electrolyte is 7%, content of ZnO added in zinc gel is 0.8%−1.0%, content of electrolyte added in zinc gel is 40%−42%, content of binder added in zinc gel is 1% and the mass ratio of polyacrylate sodium to polyacrylic acid is 6׃4, content of inhibitor added in zinc gel is 0.01%. The mercury-free alkaline Zn/MnO2 button cell produced under this technology condition does not explode after short circuit test and its distortion does not exceed 0.12 mm of its stated maximal height.

Key words: alkaline Zn/MnO2 button cell; mercury-free; safety performance; hydrogen evolution