CN218733380U

CN218733380U - Detection system for lithium battery entering power failure protection or connection falling

Info

Publication number: CN218733380U
Application number: CN202223068283.2U
Authority: CN
Inventors: 陈龙远; 汤松柏; 陶洋
Original assignee: Guangzhou Lubangtong IoT Co Ltd
Current assignee: Guangzhou Lubangtong IoT Co Ltd
Priority date: 2022-11-18
Filing date: 2022-11-18
Publication date: 2023-03-24
Anticipated expiration: 2032-11-18

Abstract

The utility model relates to the technical field of electronics, a lithium battery enters the power-down protection or connects the detecting system who drops is provided, including the battery module, still include be connected with the battery module and be used for inserting the charging circuit that external power supply charges, be connected with the battery module and be used for carrying out the voltage detection circuit of real-time detection to battery module voltage, charging circuit and voltage detection circuit are respectively with a controller signal connection; the voltage detection circuit is provided with a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, wherein the connecting end of the third resistor and the fourth resistor is connected with the controller, the opposite end of the connecting end of the third resistor and the fourth resistor is connected with the anode of the battery module, and the opposite end of the connecting end of the fourth resistor and the third resistor is connected with the cathode of the battery module. The detection data of the voltage detection circuit is read after the charging circuit charges the battery, so that whether the battery enters power failure protection or is in a connection and falling state can be judged.

Description

Detection system for lithium battery entering power failure protection or connection falling

Technical Field

The utility model relates to the field of electronic technology, specifically be a lithium cell gets into power down protection or connects detecting system who drops.

Background

Along with the development of battery technology, the integration of electronic components and the reduction of power consumption, more and more electronic products use batteries to supply power, and when an external power supply stops supplying power, the batteries can be used for supplying power to equipment, so that the equipment is kept to continuously run for a certain time. However, after some devices, especially devices which often vibrate, operate for a period of time, the electrical connection may drop to cause the battery to have no voltage output, and at the moment, the device needs to acquire information about the battery dropping in time and feed the information back to the user for timely processing. However, in some cases, when the battery is over-powered and the battery is under-powered, the battery itself will start the protection measures to automatically cut off the voltage output, and in such cases, the battery can be used normally only by recharging. Therefore, when no voltage output of the battery occurs, it is first necessary to determine whether the battery is dropped or enters a protection state.

Therefore, the technical problem that the present scheme was solved is: and judging whether the battery enters power-down protection or connection drop.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium cell gets into power down protection or connects the detecting system who drops, through the detection data that reads voltage detection circuit after charging circuit charges to the battery, can judge whether get into power down protection or for connecting the state that drops.

In order to achieve the above object, the utility model provides a following technical scheme:

a detection system for a lithium battery entering power failure protection or connection falling comprises a battery module, a charging circuit connected with the battery module and used for being connected with an external power supply to charge, and a voltage detection circuit connected with the battery module and used for detecting the voltage of the battery module in real time, wherein the charging circuit and the voltage detection circuit are respectively in signal connection with a controller; the voltage detection circuit is provided with a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series, wherein the connecting end of the third resistor and the fourth resistor is connected with the controller, the opposite end of the connecting end of the third resistor and the fourth resistor is connected with the anode of the battery module, and the opposite end of the connecting end of the fourth resistor and the third resistor is connected with the cathode of the battery module.

Preferably, the charging circuit is provided with a battery charging chip, and the model of the battery charging chip is AP5056.

Preferably, the power supply access end of the battery charging chip is connected with an external power supply, the power supply access end is connected with the ground wire through a first capacitor, the output end of the battery charging chip is connected with the positive pole of the battery module, and the control end of the battery charging chip is connected with the controller and is connected with the ground wire through a second resistor.

Preferably, the battery module comprises a battery and a second capacitor, and the second capacitor is connected in parallel to two ends of the battery.

Preferably, the controller is provided with an analog-digital converter connected with the connecting end of the third resistor and the fourth resistor.

Preferably, the resistance value of the third resistor and the resistance value of the fourth resistor are both 10K Ω.

Compared with the prior art, the beneficial effects of the utility model are that:

when the battery is in shedding or power-down protection, no voltage is output from the battery, and if the charging circuit is closed, the acquired voltage of the battery is 0V. If the battery is in the falling state at this time, the charging circuit outputs the charging voltage when the charging circuit is turned on. Because the battery is dropped, no current flows into the battery, and the charging circuit outputs the voltage V of the full-charge state of the battery _H . If the battery is in the power-down protection state and has no voltage output, when the charging circuit charges the battery, the voltage of the battery is gradually increased but is far lower than the full-power voltage, so that the battery can be judged to be in the power-down protection state. Therefore, whether the battery enters the power failure protection state or the connection and disconnection state can be judged by reading the detection data of the voltage detection circuit after the charging circuit charges the battery.

Drawings

FIG. 1 is a circuit connection block diagram of embodiment 1;

fig. 2 is a schematic circuit diagram of embodiment 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1

Referring to fig. 1-2, a system for detecting whether a lithium battery enters power failure protection or connection drop comprises a battery module 3, a charging circuit 2 connected with the battery module 3 for accessing an external power supply 6 for charging, and a voltage detection circuit 4 connected with the battery module 3 for detecting the voltage of the battery module 3 in real time, wherein the charging circuit 2 and the voltage detection circuit 4 are respectively in signal connection with a controller 1; the voltage detection circuit 4 is provided with a third resistor R3 and a fourth resistor R4, the third resistor R3 and the fourth resistor R4 are connected in series, wherein the connection end of the third resistor R3 and the fourth resistor R4 is connected with the controller 1, the opposite end of the connection end of the third resistor R3 and the fourth resistor R4 is connected with the positive electrode of the battery module 3, and the opposite end of the connection end of the fourth resistor R4 and the third resistor R3 is connected with the negative electrode of the battery module 3. The controller 1 is provided with an analog-digital converter connected with the connecting end of the third resistor R3 and the fourth resistor R4. The resistance of the third resistor R3 and the resistance of the fourth resistor R4 are both 10K Ω.

In this embodiment, the controller 1 is a single chip microcomputer, and is provided with a control button and a display for prompting and displaying the detection state. And two ends of the battery module 3 are also connected with a load 5, and the load 5 is a power consumption device in the circuit. The external power supply 6 supplies a dc 5V voltage. The controller 1 is provided with an analog-digital converter to convert and calculate the received analog signal to obtain the current voltage value of the battery module 3.

The charging circuit 2 is provided with a battery charging chip U1, and the model number of the battery charging chip U1 is AP5056. The power supply access end VCC _ IN of the battery charging chip U1 is connected with the external power supply 6, the power supply access end VCC _ IN is connected with the ground wire through the first capacitor C1, the output end of the battery charging chip U1 is connected with the positive electrode of the battery module 3, and the control end of the battery charging chip U1 is connected with the controller 1 and is connected with the ground wire through the second resistor R2. The first capacitor C1 is 22uF, and the second resistor R2 is 10K Ω.

The battery module 3 includes a battery BAT and a second capacitor C2, and the second capacitor C2 is connected in parallel to two ends of the battery BAT. The second capacitance C2 is 22uF.

In this embodiment, in operation, specifically, the following steps are performed:

step 1, the controller 1 controls the charging circuit 2 not to output charging voltage, delays for 100 milliseconds and waits for the voltage to be stable;

step 2, starting a voltage detection circuit 4, sampling a voltage value of the battery module 3 and sending the voltage value to the controller 1;

step 3, if the detection voltage signal received by the controller 1 is V _L ～V _H If the voltage is 0V, the battery is in an abnormal state, and step 4 is executed, wherein V is _L Lithium battery power-down protection voltage, V _H The full-charge state voltage of the lithium battery;

step 4, the controller 1 controls the charging circuit 2 to output charging voltage, and the step 5 is carried out after the voltage is stabilized after 2 seconds of delay;

step 5, starting the voltage detection circuit 4, sampling the voltage value of the battery module 3 and sending the voltage value to the controller 1;

step 6, the detection voltage signal received by the controller 1 is close to V _L If so, indicating that the current battery is in a normal charging state, and judging a battery processing power-down protection state; if the detected voltage signal is close to V _H Then, the battery is judged to be in a falling state. The above operation may be set to be started or stopped manually or may be controlled automatically by the controller 1. Therefore, in the embodiment, the detection data of the voltage detection circuit 4 is read after the charging circuit 2 charges the battery module 3, so that whether the battery module enters the power-down protection state or the connection and disconnection state can be judged.

The foregoing is merely a preferred embodiment of the invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive of other embodiments, and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the invention as expressed in the above teachings or as known to the person skilled in the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A detection system for lithium battery entering power failure protection or connection and disconnection comprises a battery module (3), and is characterized by further comprising a charging circuit (2) connected with the battery module (3) and used for being connected with an external power supply (6) to carry out charging, and a voltage detection circuit (4) connected with the battery module (3) and used for carrying out real-time detection on the voltage of the battery module (3), wherein the charging circuit (2) and the voltage detection circuit (4) are respectively in signal connection with a controller (1); the voltage detection circuit (4) is provided with a third resistor (R3) and a fourth resistor (R4), the third resistor (R3) and the fourth resistor (R4) are connected in series, wherein the connecting end of the third resistor (R3) and the fourth resistor (R4) is connected with the controller (1), the opposite end of the connecting end of the third resistor (R3) and the fourth resistor (R4) is connected with the anode of the battery module (3), and the opposite end of the connecting end of the fourth resistor (R4) and the third resistor (R3) is connected with the cathode of the battery module (3).

2. The system for detecting the lithium battery entering the power failure protection or the connection drop as claimed in claim 1, wherein the charging circuit (2) is provided with a battery charging chip (U1), and the model of the battery charging chip (U1) is AP5056.

3. The system for detecting the lithium battery entering the power failure protection or the connection drop according to claim 2, wherein a power supply access terminal (VCC _ IN) of the battery charging chip (U1) is connected to an external power supply (6), the power supply access terminal (VCC _ IN) is connected to a ground line through a first capacitor (C1), an output terminal of the battery charging chip (U1) is connected to a positive electrode of the battery module (3), and a control terminal of the battery charging chip (U1) is connected to the controller (1) and is connected to the ground line through a second resistor (R2).

4. The system for detecting the entering of the lithium battery into the power failure protection or the connection falling of the lithium battery as claimed in claim 1, wherein the battery module (3) comprises a Battery (BAT) and a second capacitor (C2), and the second capacitor (C2) is connected in parallel with two ends of the Battery (BAT).

5. The system for detecting the lithium battery entering the power failure protection or the connection drop according to claim 1, wherein the controller (1) is provided with an analog-digital converter connected with the connection ends of the third resistor (R3) and the fourth resistor (R4).

6. The system for detecting the lithium battery entering the power failure protection or the connection drop as claimed in claim 1 or 5, wherein the resistance of the third resistor (R3) and the resistance of the fourth resistor (R4) are both 10K Ω.