Explain the protection principle of lithium-ion battery over-discharge

Explains the protection principle and circuit diagram of lithium-ion battery over-discharge. In life, we cannot guarantee that every lithium-ion battery can meet the power we use. Battery over-discharge is a common problem. Many users do not understand that battery discharge will affect battery life. Therefore, lithium-ion battery manufacturers have designed a set of micro-power battery over-discharge protection circuits. The circuit has the advantages of extremely low detection current (detection current ≤ llmA), no power consumption after the protection circuit runs, and strong anti-interference ability. When the trip switch Kl is manually closed, the circuit enters the working state. The first C1 of the voltage can not change suddenly, stay close to 0V, and the period of 02 years. When> 10.7V, the battery regulator D1 conducts, saturation conducts, and Q2 controls. Since the voltage is not triggered, K1 is not in action. The battery and the circuit are in one In a closed working state, when the battery voltage is less than 10.7V, the voltage regulator tube D1 and Ql are cut off, and the resistor R3 charges the capacitor C1. When the voltage across C1 reaches about 0.6v, the thyristor Q2 is triggered, the trip switch is triggered, and the subsequent load circuit is disconnected. The second is the component selection travel switch, you can choose the color TV relay power switch, KDC's model A04-8y, switch to the current 5 pairs, can work in parallel to 10 maximum current, it is connected to the solenoid coil with a DC resistance of about 25, and the measurement coil The voltage v can be 7 points or higher. Choose McR100-6Ql. McR100-6 has the characteristics of extremely sensitive trigger current control rod (trigger current 10 cm ~ 30 cm) and on-state voltage drop (the measured voltage drop of this circuit is 0.8v). The selected value of the voltage regulator D1 is 0.7v of the operating voltage drop of the protection circuit. If there is no suitable voltage regulator, two voltage regulators can be used in series (when the circuit is running, the partial pressure of Rl is lower than 0.2v, and the voltage drop can be ignored). Instruct the detection current of this circuit to be less than or equal to 1.1ma, it is important that the current of the R1 branch is between 0.35ma and 0.1ma, and the current of the R2 branch is between 0.5ma and 0.75ma. The operating current depends on the DC impedance of the selected trip switch K1 coil. The kdc-a04-8y operating current used in this test is about 400mA, and the operating time does not exceed 0.2 seconds. Although this design is very good, but here we still want to remind battery users, do not discharge when absolutely necessary, this will damage the life of the battery! Develop the habit of charging regularly! Disclaimer: Some pictures and content of articles published on this site From the Internet, if there is any infringement, please contact to delete the previous article: Polymer battery charging voltage