CN-115051428-B - Battery protection chip and battery device

CN115051428BCN 115051428 BCN115051428 BCN 115051428BCN-115051428-B

Abstract

The application relates to a battery protection chip and a battery device, which comprises a signal generating circuit, a detection circuit, a logic driving circuit and a control switch, wherein the signal generating circuit generates detection signals and sends the detection signals to the detection circuit and the logic driving circuit, the number of the detection signals is more than two, the detection signals are used for time-sharing control of the detection circuit to enter detection states corresponding to the detection signals, the detection circuit enters the detection states corresponding to the detection signals when receiving the detection signals, and outputs an indication signal to the logic driving circuit when judging that the working state of a battery is not a normal state, the logic driving circuit generates a driving signal according to the detection signals and the indication signal, and the control switch is driven to switch on and off states, so that the detection states corresponding to the detection signals are only in the working state at the same time, and other detection states do not need to continuously consume battery power, thereby solving the problem of high power consumption of the current battery protection chip.

Inventors

SU DAN
SUN TIANPING
YANG MIN
QIN PENGJU

Assignees

深圳市爱协生科技有限公司

Dates

Publication Date: 20260505
Application Date: 20220518

Claims (10)

1. The battery protection chip is characterized by comprising a signal generation circuit, a detection circuit, a logic driving circuit and a control switch, wherein the signal generation circuit is connected with the detection circuit and the logic driving circuit, the detection circuit is connected with the logic driving circuit and a battery, and the control switch is arranged in a charge-discharge loop of the battery and external equipment and is connected with the logic driving circuit; the signal generation circuit is used for generating detection signals and sending the detection signals to the detection circuit and the logic driving circuit, wherein the number of the detection signals is more than two and the detection signals are used for controlling the detection circuit to enter a detection state corresponding to the detection signals in a time-sharing manner; The detection circuit detects the working parameters of the battery in a detection state corresponding to the detection signal when receiving the detection signal, and outputs an indication signal to the logic driving circuit according to the working parameters of the battery; the detection circuit comprises a charge-discharge overcurrent detection circuit and an overcharge-discharge overcurrent detection circuit, wherein the charge-discharge overcurrent detection circuit simultaneously realizes multiplexing of two detection states of charge overcurrent and discharge overcurrent, and the charge-discharge overcurrent detection circuit simultaneously realizes multiplexing of two detection states of overcharge and overdischarge; the logic driving circuit generates a driving signal according to the detection signal and the indication signal, and the driving signal is used for driving the control switch to switch the on-off state.
2. The battery protection chip according to claim 1, further comprising a reference circuit connecting the signal generation circuit and the detection circuit; The signal generating circuit is further used for generating a reference enabling signal according to the detection signal and sending the reference enabling signal to the reference circuit; The reference circuit generates a reference parameter to the detection circuit upon receiving the reference enable signal.
3. The battery protection chip according to claim 2, wherein the charge-discharge overcurrent detection circuit connects the signal generation circuit, the reference circuit, and the logic drive circuit, and the overcharge-overcurrent detection circuit connects the signal generation circuit, the reference circuit, the battery, and the logic drive circuit; The charge-discharge overcurrent detection circuit is used for detecting the current parameter of the battery when receiving the charge overcurrent detection signal or the discharge overcurrent detection signal, and outputting an overcurrent indication signal to the logic driving circuit according to the current parameter of the battery; The over-charge and over-discharge detection circuit is used for detecting the voltage parameter of the battery when receiving the over-charge detection signal or the over-discharge detection signal, and outputting an over-voltage indication signal to the logic driving circuit according to the voltage parameter of the battery.
4. The battery protection chip according to claim 3, wherein the overcharge and overdischarge detection circuit includes a voltage division circuit and a voltage detection circuit, the voltage division circuit connecting the battery, the signal generation circuit, and the voltage detection circuit, the voltage detection circuit connecting the signal generation circuit, the reference circuit, and the logic driving circuit.
5. The battery protection chip of claim 4, wherein the voltage detection circuit comprises a first data selector, a voltage comparator and a first logic or gate, the first data selector is connected to the voltage divider circuit, the signal generation circuit and the voltage comparator, the voltage comparator is connected to the reference circuit, the first logic or gate and the logic driving circuit, and the first logic or gate is connected to the signal generation circuit.
6. The battery protection chip according to claim 5, wherein the charge/discharge overcurrent detection circuit comprises a first switch, a second switch, a first resistor, a second resistor, a current comparator and a second logic or gate, the control parts of the first switch and the second switch are connected with the signal generation circuit, the first switch is connected in series with a connection line of the reference circuit and a first end of the current comparator, the second switch is connected in series with a connection line of the reference circuit and a second end of the current comparator, the first end of the current comparator is further grounded through the first resistor, the second end of the current comparator is further connected with a negative terminal of the charge/discharge circuit through the second resistor, the second logic or gate is connected with a third end of the signal generation circuit and the current comparator, and a fourth end of the current comparator is connected with the logic driving circuit.
7. The battery protection chip of claim 6, wherein the logic driver circuit comprises a voltage comparator output circuit, a current comparator output circuit, and a driver output circuit, the voltage comparator output circuit is connected to the signal generation circuit, the voltage comparator, and the driver output circuit, the current comparator output circuit is connected to the signal generation circuit, the current comparator, and the driver output circuit is connected to the control switch.
8. The battery protection chip of claim 7, wherein when the control switch is of a single power transistor configuration, the logic drive circuit further comprises a substrate selection circuit connecting the drive output circuit and the control switch.
9. The battery protection chip according to any one of claims 1 to 8, wherein the signal generating circuit includes a clock circuit and a state machine, the clock circuit being connected to the state machine, the state machine being connected to the detection circuit and the logic driving circuit.
10. A battery device comprising a battery and the battery protection chip of any one of claims 1 to 9, the battery being connected to the battery protection chip.

Description

Battery protection chip and battery device Technical Field The present application relates to the field of lithium battery protection technologies, and in particular, to a battery protection chip and a battery device. Background With the development of electronic technology, lithium batteries enter a large-scale practical stage and become a necessary power source for various devices. Among them, the battery is particularly widely used in the field where the volume of the device is limited because of the characteristic that the battery capacity can be miniaturized. For example, smart wearable devices such as smart watches, bracelets, and bluetooth headsets, the capacity of a lithium battery may be only tens of mAh, even as low as a few mAh. At present, a battery protection chip is generally adopted or used for monitoring and protecting the charging and discharging process of the lithium battery, and when the abnormal charging and discharging of the battery occurs, the connection between the battery and external equipment is cut off in time. However, the conventional detection method for the abnormal charge and discharge is to use real-time detection, that is, the corresponding detection circuit is always in a working state in the charge and discharge process, and continuously consumes the battery power, so that the problem of high power consumption is caused, and the requirement of the small-capacity battery of various intelligent wearable devices cannot be met. Disclosure of Invention Accordingly, it is necessary to provide a battery protection chip and a battery device for solving the problem of high power consumption of the conventional battery protection chip. The battery protection chip comprises a signal generation circuit, a detection circuit, a logic driving circuit and a control switch, wherein the signal generation circuit is connected with the detection circuit and the logic driving circuit, the detection circuit is connected with the logic driving circuit and a battery, and the control switch is arranged in a charge-discharge loop of the battery and external equipment and is connected with the logic driving circuit; The signal generation circuit is used for generating detection signals and sending the detection signals to the detection circuit and the logic driving circuit, wherein the number of the detection signals is more than two and the detection signals are used for controlling the detection circuit to enter a detection state corresponding to the detection signals in a time-sharing manner; When the detection circuit receives the detection signal, the detection circuit enters a detection state corresponding to the detection signal to detect the working parameter of the battery, and outputs an indication signal to the logic driving circuit according to the working parameter of the battery; the logic driving circuit generates a driving signal according to the detection signal and the indication signal, and the driving signal is used for driving the control switch to switch the on-off state. In one embodiment, the battery protection chip further includes a reference circuit connecting the signal generation circuit and the detection circuit; The signal generating circuit is further used for generating a reference enabling signal according to the detection signal and sending the reference enabling signal to the reference circuit; The reference circuit generates a reference parameter to the detection circuit upon receiving the reference enable signal. In one embodiment, the detection signals comprise an overcharge detection signal, an overdischarge detection signal, a charge overcurrent detection signal and a discharge overcurrent detection signal, the detection circuits comprise a charge-discharge overcurrent detection circuit and an overcharge overdischarge detection circuit, the charge-discharge overcurrent detection circuit is connected with the signal generation circuit, the reference circuit and the logic driving circuit, and the overcharge overdischarge detection circuit is connected with the signal generation circuit, the reference circuit, the battery and the logic driving circuit; The charge-discharge overcurrent detection circuit is used for detecting the current parameter of the battery when receiving the charge overcurrent detection signal or the discharge overcurrent detection signal, and outputting an overcurrent indication signal to the logic driving circuit according to the current parameter of the battery; The over-charge and over-discharge detection circuit is used for detecting the voltage parameter of the battery when receiving the over-charge detection signal or the over-discharge detection signal, and outputting an over-voltage indication signal to the logic driving circuit according to the voltage parameter of the battery. In one embodiment, the overcharge and overdischarge detection circuit includes a voltage division circuit and a voltage detection circuit, the voltage di