3.7V Lithium Polymer Battery.Design of self-healing circuit for nickel-cadmium nickel-metal hydride battery

China Battery Network This circuit automatically repairs the battery. When in use, connect the power supply VCC to +12V of the switching power supply, and connect points A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a homemade battery box can be used to connect the battery to the circuit). After powering up, let The circuit automatically works intermittently to repair the battery. This circuit automatically repairs the battery. When in use, connect the power supply VCC to +12V of the switching power supply, and connect points A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a homemade battery box can be used to connect the battery to the circuit). After powering up, let The circuit automatically works intermittently to perform a large amount of damage to the battery.

This circuit automatically repairs the battery. When in use, connect the power supply VCC to +12V of the switching power supply, and connect points A and B to the positive and negative poles of the battery respectively (a special battery box can be used, or a homemade battery box can be used to connect the battery to the circuit). After powering up, let The circuit automatically works intermittently to perform high-current intermittent "impact" on the battery, gradually activating the battery in the "sleep" state. If the original battery cannot be charged during normal charging, when LEDI flashes, the battery is basically activated; if there is a short circuit inside the original battery, after a suitable period of large current impact, when LED2 flashes, the battery is basically activated. Back to normal. Since the "impact" time of large current is short (this circuit is designed to be about 200ms) and the intermittent time is long enough (about 10s), the battery will not heat up or be harmed. The circuit consists of a LM555 integrated block and Rl, R2, Dl, C2 to form a multivibrator. The ③ pin of LM555 outputs a high-level narrow (about 200ms) low-level wide (about 10s) periodic pulse signal. Through this cycle The pulse signal controls the on and off of 01. When the signal is high level, .01 is turned on, and the 12V power supply voltage is applied to the battery. Due to the higher voltage, high voltage and large current are "impacted" on the battery in a short time; when the signal is low level, .Ql Cut off, the circuit does not power up the battery, and Q1 and the battery dissipate heat at this time. When C2 is fixed, adjusting Rl can adjust the width Tl of the high-level output of pin (3) of LM555, that is, the time for large current to "impact" the battery. T1≈0,693xRlxC2; adjusting R2 can control the low output of pin (3) of LM555. The width of the level T2 ensures that Q1 and the battery will not overheat. T2≈0.693xR2xC2. Ql in the circuit should use a transistor with a high current and high amplification of more than 20A (this circuit uses a disassembled Darlington transistor MJ11032). In this circuit, because the conduction time of Q1 (0.2 seconds) is relative to the cut-off time (1O seconds) It is said to be 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 functions of large current and over-current protection, which is suitable for the operation of this circuit. Power resistors need to be used for R3 and R6. The unit of resistance in the figure is kΩ. The unit of capacitance is μF. The withstand voltage of the electrolytic capacitor is 35V.