Battery pack charging and discharging protection system

Patent metadata

Field	Value
Publication number	US-11721986-B2
Application number	US-202017098322-A
Country	US
Kind code	B2
Filing date	Nov 13, 2020
Priority date	Nov 15, 2019
Publication date	Aug 8, 2023
Grant date	Aug 8, 2023

Abstract

A battery pack charging and discharging protection system comprises a battery pack and a power input controlling circuit connected with the battery pack. The system has a voltage regulator unit and a charging and discharging protection unit. The protection unit includes a coupling wake-up circuit, a power-off acceleration circuit, an MCU self-locking circuit and a button detection circuit. The coupling wake-up circuit is connected with the power input controlling circuit. The power-off acceleration circuit is connected with the coupling wake-up circuit. Compared to the conventional technology, the present invention adopts single-wire compatible communication and coupled wake-up mode to achieve the autonomous power-off of the battery pack in time, avoiding over-discharge of the battery caused by the long-term self-consumption of the battery pack.

First claim

What is claimed is:

1. A battery pack charging and discharging protection system, comprising:
a battery pack and a power input controlling circuit connected with the battery pack;
a voltage regulator unit connected to the power input controlling circuit;
a charging and discharging protection unit, the charging and discharging protection unit comprising:
a MCU self-locking circuit configured to control the on/off of the battery pack, the MCU self-locking circuit comprising a MCU a microcontroller unit (MCU);
a coupling wake-up circuit connected with the power input controlling circuit and configured to drive the voltage regulator unit to complete the power-on of the MCU self-locking circuit;
a power-off acceleration circuit connected with the coupling wake-up circuit and configured to detect the voltage of the voltage regulator unit to control a close of wake-up signals of the coupling wake-up circuit;
a switch button detect circuit connected with the MCU for detecting a signal actuated by an operator.

2. The battery pack charging and discharging protection system according to claim 1 , wherein the power input controlling circuit comprises a first switch unit and a second switch unit, and the power-off acceleration circuit comprises a first acceleration module and a second acceleration module arranged in parallel, and wherein the first acceleration module has one end thereof connected to the voltage regulator unit and the other end connected to the MCU self-locking circuit to completely turn off the first switch unit and complete the power-off of the battery pack.

3. The battery pack charging and discharging protection system according to claim 2 , wherein the first acceleration module comprises a first MOS switch, an RC parallel circuit connected to the first MOS switch and an acceleration resistor.

4. The battery pack charging and discharging protection system according to claim 3 , wherein the acceleration resistor has one end thereof connected to the drain of the first MOS switch and the other end connected to the MCU self-locking circuit.

5. The battery pack charging and discharging protection system according to claim 3 , wherein the RC parallel circuit has one end thereof connected to the gate of the first MOS switch and the other end connected to the source of the first MOS switch, so as to remain the first MOS switch in a turn-on state when the output voltage of the voltage regulator unit is lower than the driving voltage and completely turn off the first switch unit to complete the power-off of the battery pack.

6. The battery pack charging and discharging protection system according to claim 1 , wherein the second acceleration module has one end thereof connected with the voltage regulator unit and the other end connected with the MCU self-locking circuit, so as to turn off the discharge loop of the first switch unit when the battery pack is normally powered on.

7. The battery pack charging and discharging protection system according to claim 1 , wherein the MCU self-locking circuit comprises a power enable terminal connected to the MCU, and a resistor and a capacitor connected to the power enable terminal, and wherein the MCU is used to detect an operation state of the battery pack and the charger and/or the electricity system connected with the battery pack and to realize the autonomous power-off of the battery pack.

8. The battery pack charging and discharging protection system according to claim 1 , wherein the coupling wake-up circuit is connected between the power input controlling circuit and the MCU self-locking circuit, and comprises a switch coupling wake-up circuit for manually waking up the battery pack, a single-wire communication coupling circuit for waking up the battery pack during the charging process.

9. The battery pack charging and discharging protection system according to claim 8 , wherein the switch coupling wake-up circuit comprises a first switch coupling wake-up circuit and a second switch coupling wake-up circuit that are turned on by a button, and wherein when the first switch coupling wake-up circuit and the second switch coupling wake-up circuit are turned on by the button, a positive pole of the battery pack is coupled to the first switch unit to turn on the first switch unit together with the second switch unit, and drives the voltage regulator unit to ensure a stable operation of the battery pack.

10. The battery pack charging and discharging protection system according to claim 8 , wherein the switch button detect circuit divides the voltage of the battery pack and transmits the divided voltage to the MCU self-locking circuit through the voltage regulator unit when the button between the first switch coupling wake-up circuit and the second switch coupling wake-up circuit is turned on, and the MCU self-locking circuit detects the duration time of the high level of the button to send a power-down instruction.

Assignees

• Globe Jiangsu Co Ltd

Inventors

• Li Baoan
• Zhu Yanliang
• Zhuang xian
• Wang Huage

Classifications

• H02J7/663 Primary

  using battery or load disconnect circuits (H02J9/002 takes precedence) · CPC title

• H02J7/63 Primary

  against overdischarge · CPC title

• H02J7/685

  using connection detecting circuits (H02J7/68 takes precedence) · CPC title

• H02J7/865

  Battery or charger load switching, e.g. concurrent charging and load supply (H02J7/50 takes precedence) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title