AN139 – Self discharge of batteries-zh

AN-139

EXPERIMENTAL

  • Standard vessel in stainless steel.
  • Available space for the sample inside the vessel :
    – diameter : 32.7 mm.
    – height :   111.2 mm.
    – volume :   93.3 ml.
  • Sample : 6 watch batteries of Li-I type.
  • Atmosphere : air
  • Isotherm at 27.4°C during 24 hours.

CONCLUSION

  • During the first 8 hours, the MS80 monitors the heat flow dissipated by the batteries. After this time, the two vessels (measure and reference) are inverted. After another 4 hours the heat flow is stable again.
  • The deviation of heat flow before, and after the inversion (26 µW) is twice as high as the heat flow dissipated by the 6 batteries : 13µW         (= 26 µW / 2)
  • Each battery dissipates an average heat   flow of 2.2 µW (= 13 µW / 6).