Lithium-ion batteries in fully charged state

Figure 2 300 charge-discharge life test curve
Fig. 2 Charge / discharge measurement curves for 300 times

Figure 3 300 charge-discharge life test curve
Fig. 3 Charge / discharge measurement curves for 300 times

2.2 Li-ion battery prick tests

Lithium-ion batteries in fully charged state, the needle with a diameter of 3mm along the front puncture the battery, the battery voltage and temperature curve shown in Figure 4. Can be seen, the battery was pierced with acupuncture after a short circuit inside the battery voltage decreased rapidly to zero. Battery temperature is gradually increasing. As the membrane protective effect of increasing temperature to a certain temperature, short-circuit point may be eliminated, so the battery voltage at both ends will have a certain presence.

Figure 4 Experimental curve of acupuncture
Fig. 4 Curves for needle punching measurement

2.3 Li-ion battery weight impact test

Test battery on a flat surface, a 15.8 mm diameter rod placed across the cell center, a 9.1 kg dropped from a height of 61 ± 2.5 ThinkPad T42 fall surface of the battery, battery voltage and

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temperature curves shown in Figure 5 . Can be seen, the battery under heavy impact, the internal short circuit, the battery voltage drops rapidly to zero. Battery temperature gradually increased, but generally does not appear thermal runaway.

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Li-ion battery life of 300 charge-discharge test

At 20 ± 5 ℃ conditions, using 1C5A charge.ThinkPad T43 When the battery terminal voltage reaches the charge voltage limit, to constant voltage charging until the charging current ≤ 20mA, stop charging, hold 0.5h ~ 1h, then 1C5A-current discharge to the termination voltage, the discharge end, hold 0.5h ~ 1h, then the next discharge cycle until the discharge time is less than two consecutive 36min, then that end of life. Cycle life should not be less than 300. Figure 2 and Figure 3 shows the battery at 300 cycles, the situation in the performance. Figure 2, A1/A2/A3 represent the percentage of battery capacity to maintain line of 80% in less qualified, performance instability. Figure 3, B1/B2/B3 represent the percentage of battery capacity to keep in line more than 80% compliance, performance is relatively stable.HP Pavilion ZV6000 adapter HP Pavilion DV6000 adapter

Par adapterok le vendredi 25 mars 2011

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