Evaluation of temperature rise of lithium ion secondary battery used in implantable battery system of UP-VAD

Eiji Okamoto, Yusuke Inoue, Yuhta Akasaka, Sayaka Okada, Takeya Ebina, Tomoki Kasai, Satoshi Murata, Yusuke Abe, Tsuneo Chinzei, Itsuro Saito, Takashi Isoyama, Shuichi Mochizuki, Kou Imachi, Yoshinori Mitamura

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

We have developed an implantable battery system for driving an UP-VAD, and we have employed two kind of a lithium ion secondary battery: a lithium ion battery (1800mAh) and a lithium polymer battery (730mAh). The lithium ion secondary battery has high energy density, long life and no memory effect. However temperature rise of the lithium ion secondary battery is critical issue, so a heat characteristic is essential factor in a selection of the battery used in the implantable battery system. We measured energy factors of both the lithium ion battery and the lithium polymer battery used in the implantable battery system. Measurement results showed that entropy change ΔS of both battery are almost same, -1.6 to -61.1 J/(mol K)in the lithium ion battery and -9.6 to -67.5 J/(mol K) in the lithium polymer battery. Coefficient of heat transfer h and specific heat CLi in each battery were obtained as 11.7 W/m2 K and 1070 J/kg in the lithium ion battery and 8.0 W/m2 K and 1230 J/kg in the lithium polymer battery respectively . Internal resistance R was obtained as 0.1 ohm in the lithium ion battery and 0.03 ohm in the lithium polymer battery. From above results, heat characteristics of both battery are almost same, however internal resistance of the lithium ion battery is bigger than that of the lithium polymer battery. Thus temperature rise of the lithium ion battery is slightly higher than that of the lithium polymer battery under a same condition. In conclusion, the lithium polymer battery is more suitable for implantable battery system than the lithium ion battery.

Original languageEnglish
Title of host publicationIFMBE Proceedings
PublisherSpringer Verlag
Pages4142-4145
Number of pages4
Volume14
Edition1
Publication statusPublished - 2007
Externally publishedYes
Event10th World Congress on Medical Physics and Biomedical Engineering, WC 2006 - Seoul, Korea, Republic of
Duration: 2006 Aug 27 → 2006 Sep 1

Other

Other10th World Congress on Medical Physics and Biomedical Engineering, WC 2006
CountryKorea, Republic of
CitySeoul
Period06/8/27 → 06/9/1

Keywords

  • Artificial heart
  • Artificial organs
  • Battery
  • Lithium ion battery
  • VAD

ASJC Scopus subject areas

  • Biomedical Engineering
  • Bioengineering

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    Okamoto, E., Inoue, Y., Akasaka, Y., Okada, S., Ebina, T., Kasai, T., Murata, S., Abe, Y., Chinzei, T., Saito, I., Isoyama, T., Mochizuki, S., Imachi, K., & Mitamura, Y. (2007). Evaluation of temperature rise of lithium ion secondary battery used in implantable battery system of UP-VAD. In IFMBE Proceedings (1 ed., Vol. 14, pp. 4142-4145). Springer Verlag.