Battery protection circuit, power supply device and electronic device

Abstract

A battery protection circuit, electrical energy providing device and electronic device; the battery protection circuit is externally connected to a battery (100), and comprises a battery protection chip (120) for providing a protection control signal to the battery (100); the battery protection chip (120) at least comprises a positive chip supply input pin (VDD); the battery protection circuit further comprises a chip control switch (110) provided between the positive chip supply input pin (VDD) and a positive electrode of the battery and configured to be controlled in a connected state or a disconnected state; when the chip control switch (110) is in the connected state, the positive chip supply input pin (VDD) of the battery protection chip (120) is connected to the positive electrode of the battery to enable the battery protection chip (120) to start working; and when the chip control switch (110) is in the disconnected state, the positive chip supply input pin (VDD) of the battery protection chip (120) is disconnected from the positive electrode of the battery to enable the battery protection chip (120) to stop working. The battery protection circuit can avoid battery overdischarge due to power consumed by the battery protection chip, thus extending a service life of the battery.

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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