Rechargeable battery protection circuit with zero-volt recharge function

Abstract

The invention provides a rechargeable battery protection circuit with a zero-volt recharge function. The rechargeable battery protection circuit comprises an overdischarge protection circuit, an overcharge protection circuit, an overcurrent protection circuit, a short-circuit protection circuit, a logic circuit, a level switch and zero-volt recharge circuit and a system hibernate circuit. The overdischarge protection circuit, the overcharge protection circuit, the overcurrent protection circuit, the short-circuit protection circuit, the logic circuit and the level switch and zero-volt recharge circuit are respectively connected with a time delay circuit. The system hibernate circuit is connected with the logic circuit. Two MOSs (metal oxide semiconductors) M6 and M7 which are added to the level switch and zero-volt recharge circuit can cut off current extra paths generated by the level switch and zero-volt recharge circuit when the rechargeable battery is in an overcharge protection state; and the current extra paths generated by the level switch and zero-volt charge circuit in an overdischarge protection state are cut off by control manners of changing voltage signals PDB. Power consumption of rechargeable battery protection circuit chips is reduced; and reliability and completeness of chip systems are improved.

Description

technical field [0001] The invention relates to the technical field of protection circuits for rechargeable batteries, in particular to a protection circuit for rechargeable batteries with a zero-volt charging function. Background technique [0002] In order to prevent the rechargeable battery from being overcharged, overdischarged, overcurrent and short circuited, the rechargeable battery is equipped with a rechargeable battery protection control circuit. [0003] Such as figure 1 and figure 2 As shown, the rechargeable battery 10 with a protection control circuit includes a rechargeable battery 11, a protection control circuit 12, and a resistor R1 connected between the rechargeable battery 11 and the protection control circuit 12, a capacitor C1, a power tube M19, a power tube M29 and resistor R2, as well as a bias and reference circuit 40 for providing required reference voltage and reference current for all functional modules in the circuit, the bias and reference ci...

AI Technical Summary

Problems solved by technology

[0018] It can be seen that in the above-mentioned rechargeable battery protection circuit with zero-volt charging function, in the overcharge and overdischarge protection state, with the occurrence of overcharge or overdischarge, the current will increase, making the rechargeable battery protection IC Unfavorable situation where the internal temperature of the chip rises and the power consumption increases

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