dell 6400 battery
By the two FET and special protection Manifold S - 8232 composition, over and over-charge control tubes FET2 discharge control tube FET1 series in the circuit to protect IC from the battery voltage is monitored and controlled, when the battery voltage up to 4.2V . When, over-charging protection tube FET2 deadline, stop charging. To prevent malfunction, generally outside the circuit plus a delay capacitor. When the battery in a discharged state, the battery voltage down to 2.55V, the excessive discharge control tube FET1 deadline to stop power to the load. Over-current protection is greater when the load current flows out of date, control FET1 to close to stop the load discharge, the purpose is to protect the battery and FET. Over-current detection is the use of FET on-resistance as a sense resistor to monitor its voltage drop, when the voltage drop exceeds a set value, to stop discharging. In the circuit there is also generally added delay circuit to distinguish between inrush current and short-circuit current. The circuit is fully functional, reliable performance, but are highly specialized and dedicated Manifold difficult to buy, easy amateur imitation.
Because Li + battery overcharge or over-discharge may cause an explosion and cause personal injury, so the use of such batteries, security is a major concern. Therefore, the commercial lithium-ion batteries typically include a protection circuit such as the DS2720 (Figure 7). DS2720 provides a rechargeable Li + batteries all the necessary protection features, such as: to protect the battery during charging to prevent the circuit overcurrent, by limiting the discharge voltage of the battery to extend battery life. The circuit diagram above. .
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Simple charging circuit
At present, many businesses to sell without charging a single-board lithium battery. Its superior performance, low cost, can be used for home-made products and the maintenance of substitution lithium battery pack, so well received by the electronic enthusiasts love. Interested readers can refer to Figure 2 produce a charge sheet. The principle is: use a constant voltage to the battery, ensuring that no overcharge. Input DC voltage is higher than the 3-volt rechargeable battery can be. R1, Q1, W1, TL431 adjustable precision regulator circuits formed, Q2, W2, R2 constitute the adjustable constant current circuit, Q3, R3, R4, R5, LED charging indicator for the circuit. With the rechargeable battery voltage was increased, the charge current will gradually decrease until the battery is full after the voltage drop on R4 will be reduced, so that Q3 ended, LED will be extinguished, in order to ensure the battery can be sufficient, please continue after lights out Charge 1-2 hours. When used please Q2, Q3 fitted with a suitable heat sink. Advantage of this circuit are: production of simple, easy to purchase components, charging safety, display and intuitive, and will not damage the battery. By changing the W1 series can be multiple-rechargeable lithium battery and change the W2 can be carried out large-scale charge current regulation. The disadvantage is that: no over-discharge control circuit.
Application of single-cell lithium battery for example
1, substitution of products for battery maintenance, many batteries: such as notebook computers that used by the maintenance found that damage to the battery pack when the battery is only an isolated problem. Can be the appropriate choice of a single lithium battery replacement.
2, producing bright mini flashlight I had used a single 3.6V1.6AH lithium battery with an ultra-bright white LED made of a micro-torch, easy to use, compact appearance. And because the battery capacity, the average nightly use of half an hour, has been more than two months remain before needing to recharge.
3, instead of 3V power supply
As a single lithium battery voltage of 3.6V. Therefore, only a lithium battery can be replaced by two regular batteries, to the radio, Walkman, cameras and other small household electrical appliances power supply, not only light weight, but also a long time of continuous use.
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Lithium battery saved
After the lithium batteries need to save enough electricity. In more than six months can be stored at 20 ℃, showing that lithium batteries suitable for preservation at low temperatures. It has been suggested that rechargeable battery placed in the refrigerator interior preservation, is indeed a good idea.
There is the phenomenon of self-discharge of lithium batteries for a long time to save battery depletion will lead to the destruction of the internal structure of the battery, reducing battery life. Therefore, long-term preservation of the lithium battery should be every 3 to 6 months make up power once, that is charged to voltage of 3.8 ~ 3.9V (Li-ion battery voltage of 3.85V the best save so) is appropriate.
Photo:
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