Effects of electrolyte weight on self-discharge of Ni-MH battery

Taking the 1600 mAh AA type Ni-MH battery as an example, the effects of electrolyte weight on its performance, particularly self -discharge performance are investigated in this paper. The experimental results show that ,compared to the battery with electrolyte weight of 2.8g, the self-discharge rate of the battery can be significantly reduced and the high-current discharge capacity can be increased when the electrolyte weight is 3.0g, and no leakage happens on the batteries. When the electrolyte weight reaches 3.2g, the high-current discharge capacity of the batteries can be further improved, but the battery leakage easily happens. The decrease of battery self-discharge rate may be related to the suppression of the H2 diffusion process in the electrolyte, which results from the increase of the electrolyte weight.