Nickel Hydride No. 5 batteries

　　Design of self-repairing circuit for NiCdNiMH battery

　　China Battery Network This circuit automatically repairs the battery. When in use, connect the power supply VCC to the +12V of the switching power supply, connect A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a self-made battery box can be used to connect the battery to the circuit), after power on, let The circuit automatically works intermittently to recharge the battery. This circuit automatically repairs the battery. When in use, connect the power supply VCC to the +12V of the switching power supply, connect A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a self-made battery box can be used to connect the battery to the circuit), after power on, let The circuit automatically works intermittently to make a large

　　This circuit automatically repairs the battery. When in use, connect the power supply VCC to the +12V of the switching power supply, connect A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a self-made battery box can be used to connect the battery to the circuit), after power on, let The circuit automatically works intermittently to "shock" the battery with a large current intermittently, and gradually activate the battery in the "sleeping" state. If the primary battery cannot be charged during normal charging, the battery is basically activated when the LED1 is on; Back to normal. Due to the short "shock" time of the large current (this circuit is designed to be about 200ms), the intermittent time is long enough (about 10s), so the battery will not heat up and will not be damaged. The circuit consists of a LM555 integrated block and Rl, R2, Dl, and C2 to form a multivibrator. Pin ③ of LM555 outputs a periodic pulse signal with a narrow high level (about 200ms) and a wide low level (about 10s). The pulse signal controls the on and off of 01. When the signal is at a high level, .01 is turned on, and the 12V power supply voltage is applied to the battery. Due to the high voltage, the battery is "shocked" with high voltage and high current in a short time; when the signal is at a low level. Ql At the end, the circuit does not power up the battery, and at this time, Q1 and the battery dissipate heat. In the case of fixed C2, adjusting Rl can adjust the width Tl of LM555's (3) pin output high level, that is, the time for high current to "impact" the battery. T1≈0,693xRlxC2; adjusting R2 can control LM555's ③ pin output low The width T2 of the level ensures that Q1 and the battery will not overheat. T2≈0.693xR2xC2. In the circuit, Ql should use a triode with high current and high magnification above 20A (this circuit uses a disassembled Darlington triode MJ11032). In this circuit, the on-time of Q1 (0.2 seconds) is relatively low compared to the cut-off time (10 seconds). Said extremely short, so there is no need to add a radiator for Ql. Vcc is connected to the +12V of the scrapped computer switching power supply. The switching power supply has the function of large current and over-current protection, which is suitable for this circuit. R3 and R6 need to use power resistors. The unit of resistance in the figure is kΩ. The unit of capacitance is μF, and the withstand voltage of electrolytic capacitor is 35V.