Battery protection circuit, electric energy supply device and electronic device

Abstract

The invention discloses a battery protection circuit, an electric energy supply device and an electronic device. The battery protection circuit is externally connected with a battery and comprises a battery protection chip for providing protection control signals to the battery, and the battery protection chip at least comprises a positive chip power supply input pin. The battery protection circuit further comprises a chip control switch which is arranged between the positive chip power supply input pin and the positive electrode of the battery and configured as the connected or disconnected status in a controlled way; when the chip control switch is in the connected status, the positive chip power supply input pin of the battery protection chip is connected with the positive electrode of the battery, so that the battery protection chip begins to operate; when the chip control switch is in the disconnected status, the positive chip power supply input pin of the battery protection chip is disconnected with the positive electrode of the battery, so that the battery protection chip stops to operate. Through the solution, the battery is excessively discharged because the battery protection chip consumes power, the service life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of power supply protection, in particular to a battery protection circuit, a power supply device and an electronic device. Background technique [0002] Power supply is an important part of electronic equipment. Rechargeable batteries are one of the most widely used ones. At present, most mobile terminals such as smart phones and tablet computers use rechargeable batteries as power sources. [0003] The characteristics of rechargeable batteries, especially lithium-ion batteries, determine that they cannot be charged and discharged by overcharge, overdischarge, overcurrent, short circuit and ultra-high temperature. Therefore, rechargeable batteries generally need to be used with battery protection circuits. The protection circuit of the rechargeable battery is different because of the protection chip used and the power supply voltage of the battery. The circuit and parameters are different, but the protectio...

AI Technical Summary

Problems solved by technology

[0006] Using the above battery protection circuit can realize the overcharge, overdischarge and overcurrent protection functions of the rechargeable battery, and effectively protect the battery from damage due to improper use. However, the positive power input pin Vdd and the negative power input pin Vss of the rechargeable battery protection chip Connecting them to the positive and negative poles of the battery will cause the battery to consume 0.1 microamps even in the non-powered state. Although the power consumption is small, the long-term accumulation in the non-use state will still cause the battery to over-discharge lead to scrap

Moreover, because the existing battery protection circuit is generally integrated inside the battery, even if the battery is taken out of the electrical device and left idle, the battery will still be over-discharged and scrapped

[0007] The solution in the prior art is to regularly charge the rechargeable battery even when it is not in use for a long time, so as to prevent the rechargeable battery from being over-discharged, thereby causing inconvenience to the user

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