Charger loop warning device

Abstract

This application relates to the field of battery management systems, and more particularly to a charger loop warning device, comprising: a charger loop warning device, characterized in that it includes: an MCU, a buzzer, a buzzer control module, a cell temperature detection module, and a MOSFET temperature detection module, wherein the buzzer is connected to the buzzer control module; the signal input terminal of the buzzer control module is connected to the MCU, and the power supply terminal of the buzzer control module is connected to an external power supply; both the cell temperature detection module and the MOSFET temperature detection module are connected to the MCU; by installing a buzzer in the BMS system of an electric vehicle, and by detecting the temperature of the cell and MOSFET during charging through the cell temperature detection module and the MOSFET temperature detection module, when the MCU detects that the cell or MOSFET temperature has reached the rated level, it disconnects the charging circuit and controls the buzzer to start, thereby achieving the warning function.

Description

Technical Field

[0001] This application belongs to the field of battery management systems, and in particular relates to charger loop warning devices. Background Technology

[0002] With the increasing number of electric bicycles on the road, manufacturers are paying more and more attention to the battery management system. The main function of a lithium battery protection board is to intelligently manage and maintain each battery cell, preventing overcharging and over-discharging, extending battery life, and monitoring battery status. Overcharging and over-discharging are the biggest threats to lithium-ion batteries. Once overcharged or over-discharged, the battery will be damaged, its capacity reduced, and its lifespan shortened. In severe cases, it may even cause a fire or explosion. Utility Model Content

[0003] To overcome the shortcomings of the existing technology, the purpose of this application is: 1111. To achieve the above objective, this application provides the following technical solution:

[0004] A charger loop warning device, characterized in that it comprises: an MCU, a buzzer, a buzzer control module, a cell temperature detection module, and a MOSFET temperature detection module, wherein the buzzer is connected to the buzzer control module; the signal input terminal of the buzzer control module is connected to the MCU, and the power supply terminal of the buzzer control module is connected to an external power supply; both the cell temperature detection module and the MOSFET temperature detection module are connected to the MCU.

[0005] The cell temperature detection module includes several temperature sensors and a first power supply. The first power supply is connected in parallel to several thermistors and then connected to the temperature detection pins of several MCUs one by one. The several temperature sensors are all installed on the cell.

[0006] The MOS transistor temperature detection module includes a voltage divider resistor, a thermistor, and a second power supply. The power supply is connected in series with the voltage divider resistor and the thermistor and then connected to the negative terminal of the battery cell. The negative terminal of the voltage divider resistor is also connected to a temperature detection pin of the MCU.

[0007] Furthermore, the buzzer control module includes a transistor QH10, the emitter of which is connected in sequence to the buzzer and the positive terminal of the external power supply, the collector of which is grounded, and the base of which is connected to the MCU.

[0008] Furthermore, the base of the transistor QH10 is connected to a magnetoresistor RM10, the negative terminal of the magnetoresistor RM10 is grounded, and a magnetoresistor RM13 is connected in series between the MCU and the transistor QH10.

[0009] Furthermore, the cell temperature detection module includes temperature sensor T1 and temperature sensor T2. The positive terminal of the first power supply is connected in sequence to resistor R58, temperature sensor T1, R62 and a temperature detection pin of the MCU; the positive terminal of the first power supply is also connected in sequence to resistor R104, temperature sensor T2, R64 and another temperature detection pin of the MCU.

[0010] Furthermore, a first voltage-regulating capacitor and a voltage-regulating diode are connected in parallel between the temperature sensor and the temperature detection pin of the MCU, and the negative terminals of the first voltage-regulating capacitor and the voltage-regulating diode are grounded.

[0011] Furthermore, the MOS transistor temperature detection module includes a thermistor R105, a resistor R57, a resistor R61, and a second power supply. The positive terminal of the second power supply is connected in sequence to the resistor R57, the thermistor R105, and the negative terminal of the battery cell. The negative terminal of the resistor R57 is also connected in sequence to the resistor R61 and another temperature detection pin of the MCU.

[0012] Furthermore, a second voltage-regulating capacitor is connected in parallel between the resistor R61 and the temperature detection pin of the MCU, and the negative terminal of the second voltage-regulating capacitor is grounded.

[0013] The technical effects and advantages of this application are as follows:

[0014] In this application, a buzzer is installed in the BMS system of the electric vehicle, and the temperature of the battery cell and MOSFET is detected during charging by the battery cell temperature detection module and the MOSFET temperature detection module. When the MCU detects that the temperature of the battery cell or MOSFET has reached the rated height, the charging circuit is disconnected and the buzzer is activated to achieve the function of early warning. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the buzzer control module in an embodiment of this application;

[0016] Figure 2 This is a circuit diagram of the cell temperature detection module in an embodiment of this application;

[0017] Figure 3 This is a circuit diagram of the MOS transistor temperature detection module in an embodiment of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] A charger loop warning device includes: an MCU, a buzzer, a buzzer control module, a cell temperature detection module, and a MOSFET temperature detection module. The buzzer is connected to the buzzer control module; the signal input terminal of the buzzer control module is connected to the MCU, and the power supply terminal of the buzzer control module is connected to an external power supply; both the cell temperature detection module and the MOSFET temperature detection module are connected to the MCU.

[0020] Specifically, the cell temperature detection module includes several temperature sensors and a first power supply. The first power supply is connected in parallel to several thermistors and then connected to the temperature detection pins of several MCUs one by one. The several temperature sensors are all installed on the cell.

[0021] The MOS transistor temperature detection module includes a voltage divider resistor, a thermistor, and a second power supply. The power supply is connected in series with the voltage divider resistor and the thermistor and then connected to the negative terminal of the battery cell. The negative terminal of the voltage divider resistor is also connected to a temperature detection pin of the MCU.

[0022] In one embodiment of this application, such as Figure 1 As shown, the buzzer control module includes a transistor QH10 (model 8050 / SOT-23). ​​The emitter (e) of the transistor QH10 is connected to the buzzer and the positive terminal of the external power supply in sequence. The collector (c) of the transistor QH10 is grounded, and the base (b) of the transistor QH10 is connected to the MCU. Thus, when the MCU outputs a control signal to the transistor QH10, the external power supply supplies power to the buzzer, and the buzzer starts.

[0023] In one embodiment of this application, the base of the transistor QH10 is also connected to a magnetoresistor RM10 (with a resistance of 51KΩ), the negative terminal of the magnetoresistor RM10 is grounded, and a magnetoresistor RM13 (with a resistance of 10KΩ) is connected in series between the MCU and the transistor QH10.

[0024] In one embodiment of this application, such as Figure 2 As shown, the cell temperature detection module includes temperature sensor T1 and temperature sensor T2. The positive terminal of the first power supply is connected in sequence to resistor R58 (100KΩ), temperature sensor T1, R62 (1KΩ), and a temperature detection pin of the MCU. The positive terminal of the first power supply is also connected in sequence to resistor R104 (100KΩ), temperature sensor T2, R64 (1KΩ), and another temperature detection pin of the MCU.

[0025] In one embodiment of this application, in order to ensure the stability of the signal output by the temperature sensor to the MCU, a first voltage-stabilizing capacitor and a voltage-stabilizing diode are connected in parallel between the temperature sensor and the temperature detection pin of the MCU, and the negative terminals of the first voltage-stabilizing capacitor and the voltage-stabilizing diode are grounded.

[0026] In one embodiment of this application, such as Figure 3 As shown, the MOS transistor temperature detection module includes a thermistor R105 (10KΩ@25), a resistor R57 (100KΩ), a resistor R61 (1KΩ), and a second power supply. The positive terminal of the second power supply is connected in sequence to the resistor R57, the thermistor R105, and the negative terminal of the battery cell. The negative terminal of the resistor R57 is also connected in sequence to the resistor R61 and another temperature detection pin of the MCU.

[0027] In one embodiment of this application, in order to ensure the stability of the signal received by the temperature detection pin of the MCU, a second voltage-stabilizing capacitor is connected in parallel between the resistor R61 and the temperature detection pin of the MCU, and the negative terminal of the second voltage-stabilizing capacitor is grounded.

[0028] Finally, it should be noted that the above description is only a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A charger loop warning device, characterized in that, include: The system includes an MCU, a buzzer, a buzzer control module, a battery cell temperature detection module, and a MOSFET temperature detection module. The buzzer is connected to the buzzer control module; the signal input terminal of the buzzer control module is connected to the MCU, and the power supply terminal of the buzzer control module is connected to an external power supply; both the battery cell temperature detection module and the MOSFET temperature detection module are connected to the MCU. The cell temperature detection module includes several temperature sensors and a first power supply. The first power supply is connected in parallel to several thermistors and then connected to the temperature detection pins of several MCUs one by one. The several temperature sensors are all installed on the cell. The MOS transistor temperature detection module includes a voltage divider resistor, a thermistor, and a second power supply. The power supply is connected in series with the voltage divider resistor and the thermistor and then connected to the negative terminal of the battery cell. The negative terminal of the voltage divider resistor is also connected to a temperature detection pin of the MCU.

2. The charger loop warning device according to claim 1, characterized in that, The buzzer control module includes a transistor QH10. The emitter of the transistor QH10 is connected to the buzzer and the positive terminal of the external power supply in sequence. The collector of the transistor QH10 is grounded, and the base of the transistor QH10 is connected to the MCU.

3. The charger loop warning device according to claim 2, characterized in that, The base of the transistor QH10 is also connected to a magnetoresistor RM10, the negative terminal of the magnetoresistor RM10 is grounded, and a magnetoresistor RM13 is connected in series between the MCU and the transistor QH10.

4. The charger loop warning device according to claim 1, characterized in that, The cell temperature detection module includes temperature sensor T1 and temperature sensor T2. The positive terminal of the first power supply is connected in sequence to resistor R58, temperature sensor T1, R62 and a temperature detection pin of the MCU. The positive terminal of the first power supply is also connected in sequence to resistor R104, temperature sensor T2, R64 and another temperature detection pin of the MCU.

5. The charger loop warning device according to claim 4, characterized in that, A first voltage-regulating capacitor and a voltage-regulating diode are connected in parallel between the temperature sensor and the temperature detection pin of the MCU, and the negative terminals of the first voltage-regulating capacitor and the voltage-regulating diode are grounded.

6. The charger loop warning device according to claim 1, characterized in that, The MOS transistor temperature detection module includes a thermistor R105, a resistor R57, a resistor R61, and a second power supply. The positive terminal of the second power supply is connected in sequence to the resistor R57, the thermistor R105, and the negative terminal of the battery cell. The negative terminal of the resistor R57 is also connected in sequence to the resistor R61 and another temperature detection pin of the MCU.

7. The charger loop warning device according to claim 6, characterized in that, A second voltage-regulating capacitor is connected in parallel between the resistor R61 and the temperature detection pin of the MCU, and the negative terminal of the second voltage-regulating capacitor is grounded.

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