AN417

Test results

Doc ID 2074 Rev 2

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Figure 10.

Charge of a 2.2 Ah NiMH battery with the inflexion method: charging current 2.2 A,

total time 57 mn, temperature increase 7.5°C.

charging time

cell

voltage

temperature

voltage

temperature

19 deg

26.5 deg

smoothed voltage

derivative

Table 1.

Charge of different battery types with an 2.2 A current source

Battery

Monitoring

Duration

Temperature increase

NiCd 1.4 Ah

-[

inflexion point

48 min.

41 min.

9.6 °C

5 °C

NiMH 2.2 Ah

-[

inflexion point

63 min.

57 min.

18.2 °C

7.5 °C