CN212136633U - Lithium battery management system - Google Patents
Lithium battery management system Download PDFInfo
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- CN212136633U CN212136633U CN202021350641.7U CN202021350641U CN212136633U CN 212136633 U CN212136633 U CN 212136633U CN 202021350641 U CN202021350641 U CN 202021350641U CN 212136633 U CN212136633 U CN 212136633U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model provides a lithium battery management system, which comprises a control module, a plurality of data acquisition modules, a communication module and an execution module, wherein the data acquisition modules, the communication module and the execution module are respectively and electrically connected with the control module; the data acquisition modules are used for acquiring voltage signals, current signals and temperature signals of the lithium battery pack and sending the voltage signals, the current signals and the temperature signals to the control module; the control module is used for controlling the execution module to alarm or cool when detecting that the voltage signal, the current signal or the temperature signal exceeds a set threshold value; the control module is communicated with the background management system through the communication module, the execution module is used for giving an alarm when the control module detects that the voltage or the current of the lithium battery pack is abnormal, so that a worker can conveniently receive fault information even if the worker is not at the post, and when the temperature of the lithium battery pack is detected to be too high, the execution module is driven automatically to cool down, so that the service life of the lithium battery pack is effectively prolonged.
Description
Technical Field
The utility model relates to a lithium cell technical field, concretely relates to lithium battery management system.
Background
With the development of society, lithium batteries are widely applied in various fields of production and life, and the application and management of the lithium batteries become a very key technology in the development of various devices. Since the beginning of the century, the production and research of lithium batteries have made a great breakthrough, and due to the many good advantages of lithium batteries, such as stable discharge voltage, low self-discharge rate, wide working temperature range, no memory effect, long storage life, light weight, small size and the like, the lithium batteries have slowly replaced the traditional nickel-cadmium storage batteries and lead-acid storage batteries, have become more and more wide in the application fields of social production and life, and have become the mainstream power batteries at present.
Because the chemical reaction inside the lithium battery is very complex, people continuously improve the performance of the battery, and simultaneously continuously research the management technology and the use of the battery so as to prolong the service life of the battery, improve the efficiency of the battery and exert the performance of the battery to the maximum extent. Therefore, a Battery Management System (BMS) has been developed, which is used to dynamically monitor the operation states of the Battery cells and the Battery pack, accurately calculate the remaining power of the Battery, perform charge and discharge protection on the Battery, promote the Battery to be in an optimal operation state, reduce the operation cost, and improve the service life.
In the prior art, the lithium battery management system can only monitor the service condition of the lithium battery, but when the fault occurs, if the working personnel do not pay attention to the fault in real time, effective measures can not be taken to clear the fault in time, for example, when the temperature of the lithium battery pack is too high, if the measures can not be taken to cool down in time, the lithium battery pack is damaged in time, the use of the lithium battery pack is influenced due to the fact that the environment temperature is too high, and the service life of the lithium battery pack is shortened.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the shortcoming among the prior art, provide a lithium battery management system, can report to the police when lithium cell group breaks down and cool down lithium cell group when the high temperature is automatic.
The purpose of the utility model is realized through the following technical scheme: a lithium battery management system comprises a control module, a plurality of data acquisition modules, a communication module and an execution module, wherein the data acquisition modules, the communication module and the execution module are respectively and electrically connected with the control module;
the data acquisition modules are used for acquiring voltage signals, current signals and temperature signals of the lithium battery pack and sending the voltage signals, the current signals and the temperature signals to the control module;
the control module is used for controlling the execution module to alarm or cool when detecting that the voltage signal, the current signal or the temperature signal exceeds a set threshold value;
the control module is also communicated with a background management system through the communication module.
The invention has the advantages that the execution module is used for giving an alarm when the control module detects that the voltage or the current of the lithium battery pack is abnormal, so that a worker can conveniently receive fault information even if the worker is not at a post, and when the control module detects that the temperature of the lithium battery pack is overhigh, the execution module is automatically driven to cool, so that the service life of the lithium battery pack is effectively prolonged.
Further, the control module is a controller with the model of STM32F102ZET6, the data acquisition modules comprise a voltage signal detection unit, a charge-discharge current signal detection unit and a temperature signal detection unit, and the voltage signal detection unit, the charge-discharge current signal detection unit and the temperature signal detection unit are electrically connected with the controller in a CAN bus mode.
The voltage signal detection unit, the charge-discharge current signal detection unit and the temperature signal detection unit are electrically connected with the controller in a CAN bus mode, so that I \ O ports of the controller are saved.
Further, the voltage signal detection unit comprises a Hall voltage signal sensor, a filtering conditioning circuit and a diode clamping circuit which are connected in sequence;
the input end of the Hall voltage signal sensor is connected to the lithium battery pack and used for collecting voltage signals of the lithium battery pack, and the output end of the diode clamping circuit is electrically connected with the AD interface of the controller.
The technical scheme has the advantages that the Hall voltage sensor is adopted for sampling, the input end and the output end are completely electrically isolated, interference is effectively prevented, the filtering conditioning circuit is arranged for further filtering noise waves, the stability of the circuit is improved, the diode clamping circuit is arranged, only one diode can be conducted at one time, the other diode is in a cut-off state, and then the forward and reverse voltage drop of the diode is clamped below the forward conduction voltage drop of 0.5-0.7, so that the purpose of protecting the circuit is achieved.
Further, the charge-discharge current signal detection unit comprises a Hall current signal sensor and a signal conditioning circuit which are sequentially connected, the input end of the Hall current signal sensor is connected to the lithium battery pack and used for detecting current signals of the lithium battery pack during charging and discharging, and the output end of the signal conditioning circuit is electrically connected with the AD interface of the controller.
The Hall current signal sensor has good anti-interference performance, the signal conditioning circuit reduces output impedance, the influence of load on the circuit is reduced, and sampling precision is improved.
Further, the temperature signal detection unit is including the temperature signal sensor and the signal amplification circuit that connect gradually, the temperature signal sensor is used for detecting the temperature signal of lithium cell, signal amplification circuit's output with the AD interface electricity of controller is connected.
Further, the communication module is one of RS-232 communication or RS-485 communication.
The technical scheme has the advantages that when the communication distance is dozens of meters to thousands of meters, RS-485 communication can be adopted for long-distance transmission, and the RS-485 communication adopts balanced transmission and differential reception, so that the capability of inhibiting common-mode interference is realized; when the communication distance is close, the distance is less than 15 meters, so that RS-232 communication can be adopted.
Further, the execution module comprises a first execution unit and a second execution unit, the first execution unit and the second execution unit are respectively electrically connected with the control module, the first execution unit is used for giving an alarm when the control module detects that the acquired voltage signal, the acquired current signal or the acquired temperature signal exceeds a set threshold value, and the second execution unit is used for cooling when the control module detects that the acquired temperature signal exceeds the set threshold value.
The beneficial effect who adopts above-mentioned further scheme is that, when control module detects the voltage or the electric current of lithium cell group unusual, first execution unit sends out the police dispatch newspaper and makes the staff also can conveniently receive fault information even not at the post, and then the second execution module cools down when detecting the high temperature of lithium cell group and effectively improves the life-span of lithium cell group.
Further, the first execution unit comprises a driving circuit and a buzzer, the input end of the driving circuit is electrically connected with the output end of the control module, and the output end of the driving circuit is electrically connected with the buzzer.
The beneficial effect of adopting the further scheme is that when the temperature of the lithium battery pack is detected to be too high, the control module sends a driving signal to the driving circuit, and the driving circuit drives the buzzer to give an alarm.
Further, the driving circuit comprises a first photoelectric isolator and a first triode, the input end of the first photoelectric isolator is connected with the output end of the control module, the output end of the first photoelectric isolator is connected with the base electrode of the first triode, the buzzer is connected in series between the collector electrode of the first triode and the external power supply, and the emitting electrode of the first triode is grounded.
The beneficial effect of adopting above-mentioned further scheme is that, set up first optoelectronic isolator and carry out electrical isolation with input and output, effectively improve stability.
Further, the second execution unit comprises a second photoelectric isolator, a second triode and a fan, wherein the input end of the second photoelectric isolator is connected with the output end of the control module, the output end of the second photoelectric isolator is connected with the base electrode of the second triode, the fan is connected in series between the collector electrode of the second triode and an external power supply, and the emitter electrode of the second triode is grounded.
The beneficial effect of adopting above-mentioned further scheme is that, set up second optoelectronic isolator and carry out electrical isolation with input and output, effectively improve stability.
Drawings
FIG. 1 is a frame diagram of an embodiment of the present invention;
FIG. 2 is a circuit diagram of the voltage signal detecting unit of the present invention;
fig. 3 is a circuit diagram of the charge-discharge current signal detection unit of the present invention;
FIG. 4 is a circuit diagram of the temperature signal detecting unit of the present invention;
fig. 5 is a circuit diagram of the driving circuit and the buzzer of the present invention;
FIG. 6 is a circuit diagram of a second execution unit of the present invention;
fig. 7 is a circuit diagram of the signal conditioning circuit of the present invention.
Detailed Description
The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
Examples
Referring to fig. 1, a lithium battery management system includes a control module, and a plurality of data acquisition modules, communication modules, and execution modules electrically connected to the control module, respectively;
the data acquisition modules are used for acquiring voltage signals, current signals and temperature signals of the lithium battery pack and sending the voltage signals, the current signals and the temperature signals to the control module;
the control module is used for controlling the execution module to alarm or reduce the temperature when detecting that the voltage signal, the current signal or the temperature signal exceeds a set threshold value;
the control module is also communicated with the background management system through the communication module.
The execution module is used for sending out an alarm when the control module detects that the voltage or the current of the lithium battery pack is abnormal, so that a worker can conveniently receive fault information even if the worker is not at the post, and when the temperature of the lithium battery pack is detected to be too high, the execution module is driven automatically to cool, so that the service life of the lithium battery pack is effectively prolonged.
In this embodiment, control module adopts the controller that the model that provides of the di tong science and technology ltd of the deep certificate is STM32F102ZET6, and a plurality of data acquisition modules include voltage signal detecting element, charge-discharge current signal detecting element and temperature signal detecting element, and voltage signal detecting element, charge-discharge current signal detecting element and temperature signal detecting element pass through the CAN bus mode and are connected with the controller electricity.
The voltage signal detection unit, the charge-discharge current signal detection unit and the temperature signal detection unit are electrically connected with the controller in a CAN bus mode, so that I \ O ports of the controller are saved.
In this embodiment, the voltage signal detection unit includes a hall voltage signal sensor, a filtering conditioning circuit, and a diode clamping circuit, which are connected in sequence; the input end of the Hall voltage signal sensor is connected into the lithium battery pack and used for collecting voltage signals of the lithium battery pack, and the output end of the diode clamping circuit is electrically connected with the AD interface of the controller.
In specific implementation, referring to fig. 2, the hall voltage sensor adopts a hall voltage sensor with a model number of HNV-025A provided by Shenzhen golden Square circular technology Limited, a voltage signal sampled by the hall voltage sensor is conditioned by an RC filter circuit, and the voltage signal is processed by a diode clamp circuit and then is connected to an input end of an AD converter arranged in an STM32F102ZET6 controller.
The Hall voltage sensor is adopted for sampling, the input end and the output end are electrically isolated completely, interference is effectively prevented, the filter conditioning circuit is arranged for further filtering noise waves to improve the stability of the circuit, the diode clamping circuit is arranged, only one diode can be conducted at a time, and the other diode is in a cut-off state, so that the forward and reverse voltage drop of the diode can be clamped below the forward conduction voltage drop of 0.5-0.7V of the diode, and the purpose of protecting the circuit is achieved.
The charging and discharging current is an important basis for estimating the SOC of the battery, and therefore, the charging and discharging current of the battery pack needs to be detected in real time during the charging and discharging processes of the battery pack.
The charging and discharging current signal detection unit comprises a Hall current signal sensor and a signal conditioning circuit which are sequentially connected, the input end of the Hall current signal sensor is connected to the lithium battery pack and used for detecting current signals of the lithium battery pack during charging and discharging, and the output end of the signal conditioning circuit is electrically connected with an AD interface of the controller.
The Hall current signal sensor has good anti-interference performance, the signal conditioning circuit reduces output impedance, the influence of a load on the circuit is reduced, and then sampling precision is improved.
In specific implementation, referring to fig. 3 and 7, the hall current sensor with the model of HNC-25SY provided by shenzhen Tongluo technology electronics limited company is adopted, and a voltage signal output by the hall current sensor passes through the voltage follower, so that the output impedance is reduced, the influence of a load on a circuit is reduced, and the sampling precision is further improved. Since the input voltage of the AD converter built in the controller must be less than 3.3V, the back-end operational amplifier forms an inverter and reduces the voltage to 1/3, and in order to correct the deviation in the circuit debugging, the resistor R72 uses an adjustable resistor, so that the proportionality coefficient is changed by adjusting the resistance.
The temperature signal detection unit comprises a temperature signal sensor and a signal amplification circuit which are sequentially connected, the temperature signal sensor is used for detecting the temperature signal of the lithium battery, and the output end of the signal amplification circuit is electrically connected with the AD interface of the controller.
In specific implementation, referring to fig. 4, a DS18B20 temperature sensor provided by pt electrical technologies ltd, which is deeply marketed, is adopted and is input to the AD interface of the amplifier through a signal amplification circuit.
The communication module is one of RS-232 communication or RS-485 communication.
When the communication distance is dozens of meters to thousands of meters, 485 communication can be adopted for long-distance transmission, and the 485 communication adopts balanced transmission and differential reception, so that the capability of inhibiting common-mode interference is realized; when the communication distance is close, less than 15 meters enables 232 communication.
In specific implementation, the RS-485 communication adopts a 485 chip to be connected with an MAX485 converter, the MAX485 converter is connected with a UART serial port of a controller, and a background management system port is connected with the MAX485 converter, so that 485 communication can be performed; the RS-232 communication adopts 232 chip to connect with MAX232 converter, MAX232 converter connects with UART serial port of controller, background management system connects with MAX232 converter, i.e. 232 communication, in this embodiment, the background management system can be a host computer, a computer, etc., and the RS-232 standard interface (also known as EIA RS-232) is one of the commonly used serial communication interface standards, which was commonly established by the american association of Electronics Industry Association (EIA) with bell systems, modem manufacturers, and computer terminal manufacturers in 1970, the full name is "technical standard for serial binary data exchange interface between Data Terminal Equipment (DTE) and Data Communication Equipment (DCE)", RS-485 is a standard defined to balance the electrical characteristics of drivers and receivers in digital multipoint systems, which is defined by the telecommunications industry association and the electronics industry association. The digital communication network using the standard can effectively transmit signals under long-distance conditions and in environments with large electronic noise. RS-485 enables the configuration of connecting local networks and multi-drop communication links.
The execution module comprises a first execution unit and a second execution unit, the first execution unit and the second execution unit are respectively electrically connected with the control module, the first execution unit is used for giving an alarm when the control module detects that the acquired voltage signal, current signal or temperature signal exceeds a set threshold value, and the second execution unit is used for cooling when the control module detects that the acquired temperature signal exceeds the set threshold value.
When the control module detects that the voltage or the current of the lithium battery pack are abnormal, the first execution unit sends out an alarm to enable a worker to conveniently receive fault information even if the worker is not at the post, and when the temperature of the lithium battery pack is detected to be too high, the second execution module cools down to effectively prolong the service life of the lithium battery pack.
The first execution unit comprises a driving circuit and a buzzer B, wherein the input end of the driving circuit is electrically connected with the output end of the control module, and the output end of the driving circuit is electrically connected with the buzzer B.
When the temperature of the lithium battery pack is detected to be too high, the control module sends a driving signal to the driving circuit, and the driving circuit drives the buzzer B to give an alarm.
In specific implementation, referring to fig. 5, the driving circuit includes a first photo-isolator G2 and a first triode Q2, an input end of the first photo-isolator G2 is connected to an output end of the control module, an output end of the first photo-isolator G2 is connected to a base of the first triode Q2, a buzzer B is connected in series between a collector of the first triode Q2 and the external power supply, and an emitter of the first triode Q2 is grounded. The first photoelectric isolator G2 is arranged to electrically isolate the input end and the output end, so that the stability is effectively improved.
In specific implementation, referring to fig. 6, the second execution unit includes a second photo-isolator G1, a second triode Q1 and a fan K, an input end of the second photo-isolator G1 is connected to an output end of the control module, an output end of the second photo-isolator G1 is connected to a base of the first triode Q1, the fan K is connected in series between a collector of the first triode Q1 and an external power supply, and an emitter of the first triode Q1 is grounded. And a second photoelectric isolator G1 is arranged to electrically isolate the input end and the output end, so that the stability is effectively improved.
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 (10)
1. A lithium battery management system is characterized by comprising a control module, a plurality of data acquisition modules, a communication module and an execution module, wherein the data acquisition modules, the communication module and the execution module are respectively and electrically connected with the control module;
the data acquisition modules are used for acquiring voltage signals, current signals and temperature signals of the lithium battery pack and sending the voltage signals, the current signals and the temperature signals to the control module;
the control module is used for controlling the execution module to alarm or cool when detecting that the voltage signal, the current signal or the temperature signal exceeds a set threshold value;
the control module is also communicated with a background management system through the communication module.
2. The system according to claim 1, wherein the control module is a controller of model number STM32F102ZET6, the data acquisition modules comprise a voltage signal detection unit, a charge-discharge current signal detection unit and a temperature signal detection unit, and the voltage signal detection unit, the charge-discharge current signal detection unit and the temperature signal detection unit are electrically connected with the controller in a CAN bus mode.
3. The system of claim 2, wherein the voltage signal detection unit comprises a hall voltage signal sensor, a filter conditioning circuit and a diode clamping circuit which are connected in sequence;
the input end of the Hall voltage signal sensor is connected to the lithium battery pack and used for collecting voltage signals of the lithium battery pack, and the output end of the diode clamping circuit is electrically connected with the AD interface of the controller.
4. The system according to claim 2, wherein the charge and discharge current signal detection unit comprises a hall current signal sensor and a signal conditioning circuit, which are connected in sequence, an input end of the hall current signal sensor is connected to the lithium battery pack for detecting a current signal during charging and discharging of the lithium battery pack, and an output end of the signal conditioning circuit is electrically connected to an AD interface of the controller.
5. The system of claim 2, wherein the temperature signal detection unit comprises a temperature signal sensor and a signal amplification circuit, which are connected in sequence, the temperature signal sensor is used for detecting the temperature signal of the lithium battery, and an output end of the signal amplification circuit is electrically connected with the AD interface of the controller.
6. The system of any of claims 1-5, wherein the communication module is one of RS-232 communication or RS-485 communication.
7. The system according to any one of claims 1 to 5, wherein the execution module includes a first execution unit and a second execution unit, the first execution unit and the second execution unit are respectively electrically connected to the control module, the first execution unit is configured to alarm when the control module detects that the acquired voltage signal, the acquired current signal, or the acquired temperature signal exceeds a set threshold, and the second execution unit is configured to cool when the control module detects that the acquired temperature signal exceeds the set threshold.
8. The system of claim 7, wherein the first execution unit comprises a driving circuit and a buzzer, an input end of the driving circuit is electrically connected with an output end of the control module, and an output end of the driving circuit is electrically connected with the buzzer.
9. The system according to claim 8, wherein the driving circuit comprises a first optoelectronic isolator and a first triode, an input end of the first optoelectronic isolator is connected with an output end of the control module, an output end of the first optoelectronic isolator is connected with a base electrode of the first triode, the buzzer is connected in series between a collector electrode of the first triode and an external power supply, and an emitter electrode of the first triode is grounded.
10. The system according to claim 7, wherein the second execution unit comprises a second photo-isolator, a second triode and a fan, an input end of the second photo-isolator is connected with an output end of the control module, an output end of the second photo-isolator is connected with a base electrode of the second triode, the fan is connected in series between a collector electrode of the second triode and an external power supply, and an emitter electrode of the second triode is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021350641.7U CN212136633U (en) | 2020-07-10 | 2020-07-10 | Lithium battery management system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021350641.7U CN212136633U (en) | 2020-07-10 | 2020-07-10 | Lithium battery management system |
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| CN212136633U true CN212136633U (en) | 2020-12-11 |
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| CN202021350641.7U Active CN212136633U (en) | 2020-07-10 | 2020-07-10 | Lithium battery management system |
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