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  • 1 Academia Sinica Institute of Chemistry Beijing 100080 P. R. China Beijing 100080 P. R. China
  • | 2 National Engineering Development Center of High Technology Energy-Storage Materials Zhongshan, Guangdong 528437 P. R. China Zhongshan, Guangdong 528437 P. R. China
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Abstract  

An apparatus to study the battery system has been set up. The thermal effects of charge and discharge of Ni-MH batteries have been studied. The calorimetric measurements indicate that the net heat dissipation during charging is larger than that during discharging. It is observed that the ratio of heat dissipation to charging energy varies with charging capacity, and almost 90 percent of charging energy is lost as heat dissipation near the end of the charging process at 97.7 mA. A jump of thermal curve near the end of discharge due to a secondary electrode reaction has been observed.

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