A battery assembly, battery protection chip and electronic product

Abstract

The invention discloses a battery assembly, a battery protection chip and an electronic product, wherein the battery protection chip includes a power supply pin, a ground pin, a current detection pin, a discharge control pin and a charge control pin, and the chip also includes a control pin Voltage circuit, discharge control circuit and charge control circuit, the discharge control pin and charge control pin of the battery protection chip are respectively used to control the first NMOS transistor electrically connected to the negative terminal of the battery, and the second NMOS transistor electrically connected to the negative terminal of the external power supply The NMOS tube and the voltage control circuit generate a stable control voltage, so that the conduction state of the two NMOS tubes is not affected by the voltage drop of the battery, and effectively avoid the potential difference between the inside and outside of the battery due to the disconnection of the negative terminal of the battery.

Description

technical field [0001] The invention relates to the technical field of battery protection, in particular to a battery assembly, a battery protection chip and electronic products. Background technique [0002] Rechargeable batteries are widely used in consumer electronic products, and have shown a tendency to be built into an important part of electronic products. Therefore, the quality and use protection of rechargeable batteries often determine the quality of electronic products. [0003] For the battery charge and discharge protection circuit, it is necessary to detect the charging or discharging current during the charging and discharging process of the rechargeable battery. It is realized by the MOS tube, and the on-off control of the MOS tube needs to be realized by controlling the voltage of the battery, but in the early stage of charging or late discharge, the voltage of the battery is usually smaller than the full voltage, such as a rated voltage of 4.2V Lithium bat...

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Problems solved by technology

[0003] For the battery charge and discharge protection circuit, it is necessary to detect the charging or discharging current during the charging and discharging process of the rechargeable battery. It is realized by the MOS tube, and the on-off control of the MOS tube needs to be realized by controlling the voltage of the battery, but in the early stage of charging or late discharge, the voltage of the battery is usually smaller than the full voltage, such as a rated voltage of 4.2V Lithium battery, in the initial stage of charging or late discharge, the voltage of the battery will drop to about 2.5V. The on-resistance is significantly improved. At this time, the on-resistance of the external MOS tube may be twice as large as that of the battery voltage of 4V. For high-current applications, the loss caused by the on-resistance of the MOS tube will be doubled, accelerating Reduce the effective use time of the battery, but also cause heat release, and the internal temperature of electronic products will increase accordingly

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