CN204885345U - Lithium-ion battery-powered device with abnormal alarm - Google Patents

Abstract

The utility model discloses a lithium-ion battery power supply device capable of alarming abnormally, which comprises a lithium-ion battery for providing electric energy and a BMS battery management system for monitoring and protecting the lithium-ion battery. A working microprocessor and an alarm circuit for alarming. The alarm circuit includes a sounding circuit and a light-emitting circuit. The microprocessor is electrically connected to the BMS battery management system and the alarm circuit. In the step-down DC/DC power supply circuit, the power output terminal of the lithium-ion battery is connected to the first terminal of the switch, and the second terminal of the switch is connected to the load. Compared with the prior art, when an abnormality occurs in the power supply process of the utility model, the alarm circuit can send out an audible and visual alarm signal, prompting the operator to cut off the circuit in time for maintenance, which improves the safety of the circuit; the switch can automatically cut off the load to prevent the load from Burned out due to overcurrent.

Description

Lithium-ion battery-powered device with abnormal alarm

technical field

The utility model relates to a power supply device, in particular to a lithium ion battery power supply device capable of abnormal alarm.

Background technique

A lithium-ion battery is a rechargeable battery that primarily relies on the movement of lithium ions between the positive and negative electrodes to function. With the development of society, lithium-ion batteries are used more and more widely. Lithium-ion batteries have excellent characteristics such as high voltage, long cycle life, and good safety. At present, they have been widely used in electric bicycles, notebook computers, electronic scales, household electrical appliances and other products.

However, the existing lithium-ion batteries basically have no protection measures during use. When the lithium-ion batteries are working, sometimes abnormal phenomena such as low power, excessive load current, and high temperature may occur due to factors such as the environment. In the case of protection measures, the continuous operation of the lithium-ion battery will easily cause the load to be burned out, and will also reduce the service life of the lithium-ion battery, causing a safety hazard to the overall power supply circuit.

Therefore, it is necessary to provide a new power supply device to solve the above problems.

Utility model content

The purpose of the utility model is to provide a lithium-ion battery power supply device that can automatically alarm in abnormal situations and has good safety and can alarm abnormally.

In order to achieve the above object, the technical scheme adopted in the utility model is as follows:

A lithium-ion battery power supply device capable of abnormal alarm, including a lithium-ion battery for providing electric energy and a BMS battery management system for monitoring and protecting the lithium-ion battery, the power supply device also includes a battery for controlling the operation of the entire circuit A microprocessor and an alarm circuit for alarming, the alarm circuit includes a sounding circuit and a light emitting circuit, the microprocessor is electrically connected with the BMS battery management system and the alarm circuit respectively, and the microprocessor A DC/DC power supply circuit for voltage reduction is also connected between the lithium-ion battery, the electric energy output terminal of the lithium-ion battery is connected to the first terminal of the switch, and the second terminal of the switch is connected to the load.

Preferably, the switch includes a field effect transistor, the first terminal of the switch is the drain of the field effect transistor, the second terminal of the switch is the source of the field effect transistor, and the field effect transistor is The gate of the effect transistor is electrically connected with the microprocessor.

Preferably, the lithium-ion battery power supply device further includes a temperature sensor for detecting the temperature of the lithium-ion battery and the load, the temperature sensor includes a thermistor, and the temperature sensor is connected to the microprocessor circuit. sexual connection.

Preferably, the sounding circuit includes a buzzer, and the lighting circuit includes an LED lamp.

Preferably, the power supply device further includes a liquid crystal display, and the liquid crystal display is electrically connected to the microprocessor.

Compared with the prior art, the beneficial effect of the lithium-ion battery power supply device capable of abnormal alarm of the utility model is that: when an abnormality occurs in the power supply process, the alarm circuit can send out an audible and visual alarm signal, prompting the operator to cut off the circuit in time for maintenance , improving the safety of the circuit; the switch can automatically cut off the load to prevent the load from burning out due to overcurrent.

Description of drawings

Fig. 1 is a structural block diagram of the lithium-ion battery power supply device capable of abnormal alarm of the present invention.

Detailed ways

The utility model is further described below in conjunction with specific embodiments.

Please refer to Fig. 1, the lithium-ion battery power supply device of the utility model that can give an abnormal alarm includes a lithium-ion battery for providing electric energy and a BMS battery management system for monitoring and protecting the lithium-ion battery, and the power supply device also It includes a microprocessor for controlling the operation of the entire circuit and an alarm circuit for alarming. The alarm circuit includes a sounding circuit and a light emitting circuit. The sounding circuit includes a buzzer and the light emitting circuit includes an LED lamp. The microprocessor is electrically connected to the BMS battery management system and the alarm circuit respectively, and a DC/DC power supply circuit for step-down is also connected between the microprocessor and the lithium-ion battery, and the The electric energy output end of the lithium ion battery is connected to the first terminal of the switch, and the second terminal of the switch is connected to the load.

Among them, the BMS battery management system uses an intelligent battery management chip to detect information such as the voltage, operating current, total operating time, and charging and discharging status of the lithium-ion battery in real time, and can also detect the operating current of the load at the same time, and transmit these information to the microprocessor for processing.

In the utility model, the switch may adopt a single-pole single-throw switch, a field effect transistor or a triode. When a single-pole single-throw switch is used, its automatic opening and closing can be controlled by a coil, and the coil is energized by a microprocessor. When a field effect tube is used, the first terminal of the switch is the drain of the field effect tube, the second terminal of the switch is the source of the field effect tube, and the gate of the field effect tube is The pole is electrically connected with the microprocessor, and when the field effect transistor needs to be connected, the microprocessor sends a control signal to the gate. When a triode is used, the first terminal of the switch is the collector of the triode, the second terminal of the switch is the emitter of the triode, and the base of the triode is connected to the circuit of the microprocessor. Sexual connection, when it is necessary to turn on the triode, the microprocessor sends a control signal to the base.

In this embodiment, the lithium-ion battery power supply device further includes a temperature sensor for detecting the temperature of the lithium-ion battery and the load, the temperature sensor includes a thermistor, and the temperature sensor is connected to the micro The processor is electrically connected. The thermistor adopts a negative temperature coefficient thermistor, and the resistance value of the thermistor decreases at a certain rate as the temperature increases, and the voltage at both ends of the thermistor also changes. The microprocessor can detect the voltage at both ends of the thermistor, thereby calculating the resistance value of the thermistor, and finally calculating the temperature of the lithium-ion battery and the load.

In addition, the power supply device also includes a liquid crystal display, and the liquid crystal display is electrically connected to the microprocessor. The liquid crystal display can display in real time the temperature information of the lithium ion battery and the load, the ambient temperature information, the output voltage of the lithium ion battery, the battery capacity, the charging and discharging current and the operating current of the load.

In a specific application, a humidity sensor can also be provided, and the humidity sensor is electrically connected to the microprocessor. When the humidity of the environment where the power supply device is located is too high, the microprocessor can control to cut off the power supply to prevent the humidity caused by water vapor. cause a short circuit.

The working principle of the utility model is: the BMS battery management system detects the performance parameters of the lithium-ion battery and the working current of the load at all times, and transmits the corresponding data to the microprocessor. , temperature is too high), the microprocessor can control the disconnect switch, thereby protecting the load, and at the same time, the microprocessor drives the alarm circuit to work, and sends out an audible and visual alarm signal to prompt the operator to troubleshoot.

The above schematically describes the utility model and its implementation, which is not restrictive, and what is shown in the accompanying drawings is only one implementation of the utility model, and the actual structure is not limited thereto. Therefore, if a person of ordinary skill in the art is inspired by it, and without departing from the purpose of the invention of the utility model, without creatively designing a structural mode and an embodiment similar to the technical solution, it shall belong to the utility model. protected range.

Claims (5)

1. A lithium-ion battery power supply device capable of abnormal alarm, comprising a lithium-ion battery for providing electric energy and a BMS battery management system for monitoring and protecting the lithium-ion battery, characterized in that: the power supply device also includes A microprocessor for controlling the operation of the entire circuit and an alarm circuit for alarming, the alarm circuit includes a sounding circuit and a light emitting circuit, and the microprocessor is electrically connected to the BMS battery management system and the alarm circuit respectively A DC/DC power supply circuit for step-down is also connected between the microprocessor and the lithium-ion battery, the electric energy output terminal of the lithium-ion battery is connected to the first terminal of the switch, and the second terminal of the switch is The terminals are connected to the load. 2. The lithium-ion battery power supply device capable of abnormal alarm as claimed in claim 1, characterized in that: the switch includes a field effect transistor, and the first terminal of the switch is the drain of the field effect transistor, so The second terminal of the switch is the source of the field effect transistor, and the gate of the field effect transistor is electrically connected with the microprocessor. 3. The lithium-ion battery power supply device capable of abnormal alarm as claimed in claim 1, characterized in that: the lithium-ion battery power supply device also includes a temperature sensor for detecting the temperature of the lithium-ion battery and the load, The temperature sensor includes a thermistor, and the temperature sensor is electrically connected to the microprocessor. 4. The lithium-ion battery power supply device capable of alarming abnormalities according to claim 1, wherein the sounding circuit comprises a buzzer, and the light emitting circuit comprises an LED lamp. 5. The lithium-ion battery power supply device capable of alarming abnormalities according to claim 1, wherein the power supply device further comprises a liquid crystal display, and the liquid crystal display is electrically connected to the microprocessor.