CN211320973U - Lithium cell intelligence protection circuit - Google Patents
Lithium cell intelligence protection circuit Download PDFInfo
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- CN211320973U CN211320973U CN201922469870.4U CN201922469870U CN211320973U CN 211320973 U CN211320973 U CN 211320973U CN 201922469870 U CN201922469870 U CN 201922469870U CN 211320973 U CN211320973 U CN 211320973U
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Abstract
The utility model provides an intelligent protection circuit for lithium batteries, which comprises a charger for charging a lithium battery pack, a charging field effect tube Q1 and a discharging field effect tube Q2 which are arranged on the loop of the charger and the lithium battery pack, a main control module for processing and controlling the charging field effect tube Q1 and the discharging field effect tube Q2 according to the sampling signal of the analog front end; the system also comprises a satellite positioning module and a communication module, and positioning information output by the satellite positioning module is sent to the background through the communication module under the control of the main control module. The utility model discloses in, at lithium cell intelligence protection circuit orientation module and communication module, utilize communication module, the backstage is uploaded with locating information to the host system of lithium cell group, can guarantee that backstage administrator masters the whereabouts of lithium cell group, prevents that the lithium cell is stolen.
Description
Technical Field
The invention relates to the field of battery protection, in particular to an intelligent lithium battery protection circuit with positioning, anti-theft and collision alarming functions.
Background
In view of the situation that most lithium battery electric vehicles (non-lead-acid battery electric vehicles) in the current market are basically not provided with anti-theft alarms, the whole vehicle is in a 'naked vehicle' unprotected state, and the lithium batteries are often stolen. Although the traditional lithium starting battery for the vehicle is superior to the traditional lead-acid battery in all aspects except cost, the traditional lithium starting battery is not free, and the traditional lead-acid battery has the same anti-theft problem, although the vehicle theft is not easy to steal due to the improvement of the vehicle anti-theft technology and the improvement of the knowledge level of people, and the condition that the vehicle is not easy to be stolen occurs, so that more and more thieves can put eyes on vehicle accessories which are easy to get on hand and easy to get off hand, such as: the starting battery for the vehicle, the electronic device for the vehicle and the like are the most stolen, the situation is the most serious, the vehicle battery has the characteristics of easy theft, fast sales and the like, the recent theft rate and section of the vehicle battery are increased, particularly, the battery of the electric vehicle is particularly obviously stolen, and the battery is one of the core components of the battery, so that the electric vehicle basically has no battery after the battery is stolen, and great trouble is caused to consumers.
Disclosure of Invention
The invention aims to overcome the defect that in the prior art, an automobile lithium battery protection circuit has no anti-theft measures, which causes great troubles to consumers, and provides an intelligent lithium battery protection circuit adopting anti-theft measures.
The technical scheme for realizing the technical purpose of the invention is as follows: an intelligent protection circuit for a lithium battery comprises a charger for charging a lithium battery pack, a charging field effect transistor Q1 and a discharging field effect transistor Q2 which are arranged on a loop of the charger and the lithium battery pack, a simulation front end for sampling the voltage of each single lithium battery in the lithium battery pack, and a main control module for processing and controlling the charging field effect transistor Q1 and the discharging field effect transistor Q2 according to a signal sampled by the simulation front end; the system also comprises a satellite positioning module and a communication module, and positioning information output by the satellite positioning module is sent to the background through the communication module under the control of the main control module.
According to the invention, the positioning information is uploaded to the background by the intelligent protection circuit positioning module and the communication module of the lithium battery pack through the communication module and the main control module of the lithium battery pack, so that a background manager can be ensured to master the track of the lithium battery pack, and the lithium battery is prevented from being stolen.
Further, in the above lithium battery intelligent protection circuit: communication module GPRS, satellite positioning module include GPS orientation module or big dipper orientation module under the control of host system, the locating information of GPS orientation module or big dipper orientation module output sends the smart mobile phone that the backstage was installed corresponding APP to through GPRS, shows on smart mobile phone.
Further, in the above lithium battery intelligent protection circuit: the simulation front end includes the current detection unit who carries out the detection to the discharge current of lithium cell group, current detection unit's output by host system gather host system in the current module that carries out the current module of handling to the discharge current of the lithium cell group that current detection unit detected, current module when the discharge current of the lithium cell group that current detection unit detected is greater than the setting value, host system send the cell-phone through GPRS to whether receive the instruction of cell-phone and control the disconnection of field effect transistor Q2.
Further, in the above lithium battery intelligent protection circuit: still include vibration sensor and alarm device, vibration sensor and alarm device all with host system link to each other, host system when gathering the vibration range that vibration sensor rolled out and being greater than the setting value, trigger alarm device and report to the police, improve the smart mobile phone through GPRS simultaneously.
Further, in the above lithium battery intelligent protection circuit: the input end of the communication module is also provided with a voltage stabilizing module, the voltage stabilizing module comprises a current limiting resistor R13 which is connected in series with a TX pin in the input end of the communication module, a current limiting resistor R22 which is connected in series with an RX pin, a voltage stabilizing diode ZD4, a voltage stabilizing diode ZD5, a resistor R25 and a resistor R24; two ends of the voltage-stabilizing diode ZD4 and the resistor R25 are respectively connected between the other end of the current-limiting resistor R13 and the ground, and two ends of the voltage-stabilizing diode ZD5 and the resistor R24 are respectively connected between the other end of the current-limiting resistor R22 and the ground.
Further, in the above lithium battery intelligent protection circuit: the input end of the communication module is also provided with a communication control switch module, the communication control switch module comprises a switch tube M1 and a switch tube M2, a control signal TR generated by the main control module is connected with the P pole of a diode D3, the N pole of the diode D3 is respectively connected with one end of a resistor R12 and one end of a resistor R17, the other end of the resistor R12 is respectively connected with the G pole of the switch tube M1 and one end of the resistor R11, the other end of the resistor R17 is respectively connected with the G pole of the switch tube M2 and one end of a resistor R18, and the other end of the resistor R11 and the other end of the resistor R18 are connected with the high-;
the TX pin of the communication input end is connected with the S pole of the switch tube M1 through a current limiting resistor R13, and the D pole of the switch tube M1 is connected with the TXD pin of the communication output port;
an RX pin of the communication input end is connected with an S pole of the switch tube M2 through a current limiting resistor R22, and a D pin of the switch tube M2 is connected with an RXD pin of the communication output end.
Further, in the above lithium battery intelligent protection circuit: the high-voltage protection module comprises a diode D6, a Zener diode ZD3, a Zener diode ZD6, a triode Q7, a capacitor C13, a resistor R25, a resistor R34 and a resistor R35;
the RXD pin of the communication output end is grounded through a voltage stabilizing diode ZD3, a resistor R25 and a resistor R35; the common terminal of the resistor R25 and the resistor R35 is connected with the b pole of the triode Q7;
the other ends of the resistor R11 and the resistor R18 are respectively connected with the P pole of the diode D6, the resistor R34, one end of the capacitor C13 and the K pole of the zener diode ZD 6;
the N pole of the diode D is connected with the C pole of the triode Q7, and the E pole of the triode Q7 is grounded;
the resistor R34, the other end of the capacitor C13 and the A pole of the zener diode ZD6 are grounded.
Further, in the above lithium battery intelligent protection circuit: the communication module also comprises an electrostatic protection module, wherein the electrostatic protection module comprises a diode D4 and a diode D5; the N poles of the diode D4 and the diode D5 are respectively connected with the RXD pin and the TXD pin of the communication output end, and the P poles of the diodes are grounded.
Further, in the above lithium battery intelligent protection circuit: still include wading water power-off circuit, wading water power-off circuit include water trigger circuit, water trigger circuit's output and host system's overcurrent protection sense terminal electricity be connected, water trigger circuit's input and lithium cell intelligent protection circuit positive negative pole output are regarded as receiving water induction end together, when host system detected water trigger circuit's output is the high level, make charging field effect transistor Q1, discharge field effect transistor Q2 end.
Further, in the above lithium battery intelligent protection circuit: the water trigger circuit comprises a triode U2 and a resistor R1, an emitting electrode of the triode is connected with a connecting line between the positive input end of the lithium battery core and the positive output end of the lithium battery intelligent protection circuit, a base electrode of the triode is connected with a water-receiving induction end near the positive output end and the negative output end of the lithium battery intelligent protection circuit, and a collector electrode of the triode is connected with the resistor R1 and the main control module; the other end of the resistor R1 is connected with the negative electrode output end of the lithium battery intelligent protection circuit, and the main control module controls the charging field-effect tube Q1 and the discharging field-effect tube Q2 to be cut off when detecting that the resistor R1 has a high level.
The invention will be explained in more detail below with reference to the drawings and examples.
Drawings
Fig. 1 is a schematic diagram of an intelligent protection circuit for a lithium battery according to an embodiment of the present invention.
Fig. 2 is a block diagram of a lithium battery intelligent protection circuit according to an embodiment of the present invention.
Fig. 3 is a protection block diagram of a communication module in the lithium battery intelligent protection circuit according to the embodiment of the invention.
Fig. 4 is a schematic diagram illustrating protection of a communication module in the lithium battery intelligent protection circuit according to the embodiment of the present invention.
Fig. 5 is a schematic diagram of a waterproof module in an intelligent protection circuit for a lithium battery according to an embodiment of the invention.
Detailed Description
The embodiment is an intelligent lithium battery protection circuit with tracking and positioning functions for preventing a lithium battery pack on an electric vehicle from being stolen, and the intelligent lithium battery protection circuit is shown in fig. 1: the remote control intelligent anti-theft system for the lithium battery of the electric vehicle comprises a protective shell, a battery pack, a detection unit, a control unit, a signal transceiver and a user side, wherein the battery pack, the detection unit, the control unit and the signal transceiver are arranged in the protective shell; the detection unit comprises a temperature detection circuit, a circuit current detection circuit, an anti-theft detection circuit, a voltage detection circuit and a charge equalization detection circuit, wherein the temperature detection circuit, the voltage detection circuit and the charge equalization detection circuit are respectively connected with a sub battery on the battery pack; the user side is provided with a communication module, a display screen and function keys; still be equipped with audible-visual annunciator and trail orientation module in the protective housing, audible-visual annunciator and trail orientation module and control unit electricity and be connected, trail orientation module and user side wireless connection simultaneously.
In this embodiment, the anti-theft system is composed of a front end and a background, the front end is a battery management system with an intelligent background communication positioning GPRS alarm function, and is used for charging and discharging management of a battery module, and includes a charger, and a simulation front end, a main control module, a communication module and a positioning module which are connected in sequence, as shown in fig. 2, a power supply end of the positioning module is connected with a positive electrode B + of the battery module, a positive input end and a negative input end of the simulation are respectively connected with a positive electrode B + and a negative electrode B-of the battery module, and a positive output end and a negative output end of the charger are respectively connected with a positive electrode B + and a negative electrode B-of the; the battery management system also comprises a charging field effect transistor Q1, a discharging field effect transistor Q2 and a positioning module, wherein the product main control module is in communication connection with the positioning module; the grid G1 of the charging field effect transistor Q1 and the grid G2 of the discharging field effect transistor Q2 are connected with the main control module, the drain D1 of the charging field effect transistor Q1 is connected with the negative input end of the charger, the source S1 of the charging field effect transistor Q1 is connected with the drain D2 of the discharging field effect transistor Q2, and the source S2 of the discharging field effect transistor Q2 is connected with the negative electrode of the battery module. Among them, the battery module is preferably a lithium battery module.
In this embodiment, the protection board communication main module includes a communication input terminal-signal sending module connected, and further includes a voltage stabilizing module and a high voltage protection module, as shown in fig. 3 and 4, the communication control switch module has a switch control terminal TR for connecting with a power supply loop of the signal sending module, two input terminals of the voltage stabilizing module are respectively connected with two terminals (pins) TX, RX of the communication input terminal, two output terminals of the communication control switch module are respectively connected with two terminals TXD, RXD of the communication output terminal, and two input terminals of the high voltage protection module are respectively connected with the communication control switch module and the terminal RXD; furthermore, the communication module further comprises an ESD protection module, and two input ends of the ESD protection module are respectively connected with two terminals (pins) TXD and RXD of the communication output end. The analog front end is based on a chip BQ 76940. The main control chip in the main control module is a singlechip; the type of the single chip is preferably Atmega32M 1.
In this embodiment, the tracking and positioning module is a gps module or a beidou satellite positioning module, which are popular positioning modules at present. The signal transceiver and the communication module are 315M/433M/GPRS communication chips. The function keys comprise an up-locking key, an unlocking key, an intelligent locking key and a code matching key. The user side is provided with a vibrator, an alarm lamp, a wading power-off alarm and a collision alarm. The user side is a remote controller, a mobile phone APP or an intelligent bracelet.
In this embodiment, two anti-theft methods are adopted: the first one is that electric motor car does not have any anti-theft measure itself, but sets up the intelligent protection circuit of this embodiment on the lithium cell group that uses, has anti-theft device and tracking device in the intelligent protection circuit of this embodiment, and this is the safest mode when directly cutting off the power supply, can reach like this and prevent to steal the power pack and also can prevent burglary and track the location and retrieve. The second is that the vehicle itself also installs burglar alarm, has opened intelligence like this and has locked in time, and burglar alarm of electric motor car itself still can normally work, in case detect the sign that the motor has the start under intelligent anti-theft mode, can close the output of battery built-in circuit, forbids the electric motor car to travel, reaches duplicate protection's purpose. The voltage of the battery, the running or static state of the vehicle can be judged, the state of supplying electric energy to the electric equipment is controlled, and overvoltage or low-voltage protection is carried out, so that the electric equipment and the battery are protected. The anti-theft protection device has the advantages that the protection and anti-theft performance of the lithium battery are improved, particularly the safety performance of the lithium battery used on a vehicle is improved, the anti-theft protection device is widely suitable for vehicle anti-theft, and the communication module is provided for facilitating the communication connection with the module with the positioning function, so that the safe operation and use of the battery pack by a user are facilitated, the water resistance, the electricity prevention and the anti-theft alarm are realized, and the management and the maintenance of charging and discharging of the; in addition, the communication module in the battery management system is provided with the high-voltage protection module and the ESD protection module, so that the main control module of the battery management system can be effectively protected from being damaged by high-voltage signals in the connection communication with external equipment, and the working reliability and the service life of the battery management system can be effectively improved.
As shown in fig. 2, the intelligent protection circuit for a lithium battery in this embodiment includes a charger for charging a lithium battery pack, a charging fet Q1 and a discharging fet Q2 that are disposed in a loop between the charger and the lithium battery pack, and a master control module for processing and controlling the charging fet Q1 and the discharging fet Q2 according to a signal sampled by the analog front end at an analog front end for sampling voltages of individual lithium batteries in the lithium battery pack; the system also comprises a satellite positioning module and a communication module, and positioning information output by the satellite positioning module is sent to the background through the communication module under the control of the main control module. Communication module GPRS, satellite positioning module include GPS orientation module or big dipper orientation module under the control of host system, the locating information of GPS orientation module or big dipper orientation module output sends the smart mobile phone that the backstage was installed corresponding APP to through GPRS, shows on smart mobile phone. The simulation front end includes the current detection unit who carries out the detection to the discharge current of lithium cell group, current detection unit's output by host system gather, include the current module that carries out the processing to the discharge current of the lithium cell group that current detection unit detected in host system, when the discharge current of the lithium cell group that current detection unit detected of current module is greater than the setting value, host system sends the cell-phone through GPRS to whether receive the instruction of cell-phone and control the disconnection of field effect transistor Q2. Still include vibration sensor and alarm device, vibration sensor and alarm device all with host system link to each other, host system when gathering the vibration range that vibration sensor rolled out and being greater than the setting value, trigger alarm device and report to the police, improve the smart mobile phone through GPRS simultaneously.
Specifically, in this embodiment, the battery module is subjected to charge and discharge management, and includes a charger, an Analog Front End (AFE), a main control module, a signal sending module, and a positioning module, which are connected in sequence, where a power supply end of the positioning module is connected to a positive electrode B + of the battery module, a positive input end and a negative input end of the analog front end are respectively connected to a positive electrode B + and a negative electrode B-of the battery module, and a positive output end and a negative output end of the charger are respectively connected to a positive electrode B + and a negative electrode B-of the battery module; the battery management system also comprises a charging field effect transistor Q1, a discharging field effect transistor Q2 and a mobile terminal, wherein the product signal sending module is in communication connection with the positioning module; the grid G1 of the charging field effect transistor Q1 and the grid G2 of the discharging field effect transistor Q2 are connected with the main control module, the drain D1 of the charging field effect transistor Q1 is connected with the negative input end of a charger, the source S1 of the charging field effect transistor Q1 is connected with the drain D2 of the discharging field effect transistor Q2, and the source S2 of the discharging field effect transistor Q2 is connected with the negative electrode B-of the power supply module.
As shown in figures 1 and 2, an electric motor car lithium cell remote control intelligence anti-theft system, including protective housing, group battery 1, detecting element, the control unit, signal transceiver and intelligent bracelet, corresponding APP is equipped with to the intelligent bracelet, and signal transceiver is 433M communication chip, and group battery, detecting element, the control unit and signal transceiver establish in the protective housing, and the control unit is connected with group battery, detecting element and signal transceiver electricity respectively, and the group battery is connected with detecting element. The detection unit comprises a temperature detection circuit, a circuit current detection circuit, an anti-theft detection circuit, a voltage detection circuit and a charge equalization detection circuit, wherein the temperature detection circuit, the voltage detection circuit and the charge equalization detection circuit are respectively connected with the sub batteries on the battery pack 1, the circuit current detection circuit is respectively connected with the battery pack 1, and the anti-theft detection circuit is connected with the battery pack 1 or the motor of the electric vehicle. The intelligent bracelet is connected with 433M communication chip, and intelligent bracelet APP function key includes lock key, unlock key, intelligent lock key and to the code key. Still be equipped with audible-visual annunciator and trail orientation module in the protective housing, audible-visual annunciator with trail orientation module and the control unit electricity and be connected, trail orientation module and intelligent bracelet wireless connection for GPRSGPS module, trail orientation module simultaneously. The battery pack 1 is also provided with a vibration burglar alarm which is electrically connected with the battery pack 1.
The working principle is as follows: the locking function key of the mobile phone with the APP is adopted to lock the lithium battery power supply for the microcontroller on the lithium battery built-in protection board, namely, a discharging loop of the lithium battery is disconnected, and the lithium battery is cut off from supplying power to the outside, so that the effect of locking a circuit system built in the lithium battery is achieved, and even if a battery pack of the electric car is provided, the electric car cannot be normally started; meanwhile, a microcontroller on the lithium battery can be remotely controlled through an intelligent lock key on the mobile phone, the microcontroller controls a detection unit to continuously detect the output current of the lithium battery protection board circuit, once the current is abnormal (if the current is suddenly larger than 2A), the battery is immediately locked, a discharging loop of the lithium battery is disconnected, the lithium battery is cut off to supply power to the outside, the discharging loop is re-opened after a period of time, the detection unit detects the output current of the lithium battery protection board circuit again, if abnormal conditions are found, the operation is continuously carried out, and the protection state can be relieved until an unlocking signal of the mobile phone is received. Meanwhile, the battery pack is provided with a vibration alarm, when the anti-theft function is started, the battery pack starts to alarm if moving or vibrating, the microcontroller contacts the mobile phone through the signal transceiver, the GPRSGPS module sends coordinate information of the battery to inform a user side at intervals, and the user can quickly retrieve the battery pack according to the coordinate information.
As shown in fig. 3, in this embodiment, the communication module further has a protection module thereon, such as a voltage regulator module 1, a communication control switch module 2, a high voltage protection module 3, and an electrostatic protection module 4.
As shown in fig. 4, the voltage regulator module 1 includes a current-limiting resistor R13 connected in series to the TX pin and a current-limiting resistor R22 connected in series to the RX pin in the input terminal of the communication module, and further includes a zener diode ZD4, a zener diode ZD5, a resistor R25, and a resistor R24; two ends of the voltage-stabilizing diode ZD4 and the resistor R25 are respectively connected between the other end of the current-limiting resistor R13 and the ground, and two ends of the voltage-stabilizing diode ZD5 and the resistor R24 are respectively connected between the other end of the current-limiting resistor R22 and the ground.
The communication control 2 switch module comprises a switch tube M1 and a switch tube M2 as shown in fig. 4, a control signal TR generated by the main control module is connected with a P pole of a diode D3, an N pole of the diode D3 is respectively connected with one ends of a resistor R12 and a resistor R17, the other end of a resistor R12 is respectively connected with a G pole of a switch tube M1 and one end of a resistor R11, the other end of a resistor R17 is respectively connected with a G pole of the switch tube M2 and one end of a resistor R18, and the other ends of the resistor R11 and the resistor R18 are connected with the high-voltage protection module; the TX pin of the communication input end is connected with the S pole of the switch tube M1 through a current limiting resistor R13, and the D pole of the switch tube M1 is connected with the TXD pin of the communication output port; an RX pin of the communication input end is connected with an S pole of the switch tube M2 through a current limiting resistor R22, and a D pin of the switch tube M2 is connected with an RXD pin of the communication output end.
As shown in fig. 4, the high-voltage protection module 3 includes a diode D6, a zener diode ZD3, a zener diode ZD6, a transistor Q7, a capacitor C13, a resistor R25, a resistor R34, and a resistor R35; the RXD pin of the communication output end is grounded through a voltage stabilizing diode ZD3, a resistor R25 and a resistor R35; the common terminal of the resistor R25 and the resistor R35 is connected with the b pole of the triode Q7; the other ends of the resistor R11 and the resistor R18 are respectively connected with the P pole of the diode D6, the resistor R34, one end of the capacitor C13 and the K pole of the zener diode ZD 6; the N pole of the diode D is connected with the C pole of the triode Q7, and the E pole of the triode Q7 is grounded; the resistor R34, the other end of the capacitor C13 and the A pole of the zener diode ZD6 are grounded.
In this embodiment, a water trigger circuit is added to a known lithium battery protection board. The output end of the water trigger circuit is electrically connected with the overcurrent protection detection end of the lithium battery protection chip; the input end of the water trigger circuit is used as a water sensing end. When the positive and negative output ends of the waterproof protection board and the water-receiving induction end receive water simultaneously, the output end potential of the water trigger circuit is raised, so that the potential of the over-discharge protection output end of the protection chip is lowered, the field effect tube is cut off, and the purpose of preventing electrochemical reaction by disconnecting the lithium battery core and the load circuit is achieved. This patent design beneficial effect is: the protection lithium cell protection plate has the advantages that the protection lithium cell protection plate has the functions of over-charging protection, over-discharging protection, over-current protection, short-circuit protection and the like, and also has the functions of water protection, positioning anti-theft function, smart phone, bracelet APP unlocking, sound control alarm and light flicker, so that a load electronic circuit and an electronic product are protected from being damaged by water. The safety protection level is higher, only one resistor or one transistor element is adopted in the water-receiving protection circuit, and the structure is simple.
As shown in fig. 5: 1 is the positive electrode input end of a lithium battery cell; 2 is the anode output end of the electronic waterproof protective plate; 3 is the water-receiving induction end of the electronic waterproof protective plate; 4 is the cathode output end of the electronic waterproof protective plate; 5 is the negative electrode input end of the lithium cell; f is a circuit substrate; u1 is a main control module; t1 is a first fet (second fet not shown): u2 is a water trigger circuit; r1 is a first resistor; a is the positive input end of the main control module U1; b is the over-discharge protection output end of the main control module U1: i is an overcurrent protection detection end of the main control module U1; h is the negative input end of the main control module U1; g1 is the gate of the first FET T1; d1 is the drain of the first FET T1; s1 is the source of the first FET T1; c is a collector of a transistor U2; b is the base of a transistor U2; e is the emitter of transistor U2. The water trigger circuit comprises a triode U2 and a resistor R1, an emitting electrode of the triode is connected with a connecting line between the positive electrode input end of the lithium battery core and the positive electrode output end of the lithium battery intelligent protection circuit, a base electrode of the triode is connected with a water receiving induction end near the positive electrode output end and the negative electrode output end of the lithium battery intelligent protection circuit, and a collector electrode of the triode is connected with the resistor R1 and the main control module; the other end of the resistor R1 is connected with the negative electrode output end of the intelligent protection circuit 4 for the lithium battery, and the main control module controls the charging field-effect transistor Q1 and the discharging field-effect transistor Q2 to be cut off when detecting that the resistor R1 has a high level.
Under normal conditions, the over-current protection detection terminal 1 of the main control module U1 is at low level, so that the over-current protection output terminal B of the main control module U1 outputs high level to the gate G1 of the first fet T1, so that the drain D1 of the first fet T1 is connected to the source S, and similarly, the gate G2 of the second fet T2, which is not shown, connects the drain D2 of the second fet T2 to the source S2. Thereby leading the negative input end 5 and the negative output end 4 of the electronic waterproof protection board to be conducted with power output. When the positive output end 2 and the negative output end 4 of the electronic waterproof protection board are simultaneously subjected to water by the water sensing end 3, the triode U2 is switched on under the conductive action of water, so that the potential of the overcurrent protection detection end I of the main control module U1 is raised, the over-discharge protection output end B of the main control module U1 outputs a bottom level, and the potential of the gate G1 of the first field-effect transistor T1 is pulled to bottom, so that the drain D1 of the first field-effect transistor T1 is disconnected from the source S1 to enter a waterproof protection state (the same is true for the second field-effect transistor T2). This waterproof protection state will continue until there is no mechanical contact between the load electronic circuit and the positive output terminal 2 and the negative output terminal 4 of the electronic waterproof protection board, at which time the electronic waterproof protection board automatically returns to the normal power supply state.
Claims (10)
1. An intelligent protection circuit for a lithium battery comprises a charger for charging a lithium battery pack, a charging field effect transistor Q1 and a discharging field effect transistor Q2 which are arranged on a loop of the charger and the lithium battery pack, a simulation front end for sampling the voltage of each single lithium battery in the lithium battery pack, and a main control module for processing and controlling the charging field effect transistor Q1 and the discharging field effect transistor Q2 according to a signal sampled by the simulation front end; the method is characterized in that: the system also comprises a satellite positioning module and a communication module, and positioning information output by the satellite positioning module is sent to the background through the communication module under the control of the main control module.
2. The intelligent protection circuit for lithium batteries according to claim 1, characterized in that: communication module GPRS, satellite positioning module include GPS orientation module or big dipper orientation module under the control of host system, the locating information of GPS orientation module or big dipper orientation module output sends the smart mobile phone that the backstage was installed corresponding APP to through GPRS, shows on smart mobile phone.
3. The intelligent protection circuit for lithium batteries according to claim 2, characterized in that: the simulation front end includes the current detection unit who carries out the detection to the discharge current of lithium cell group, current detection unit's output by host system gather host system in the current module that carries out the current module of handling to the discharge current of the lithium cell group that current detection unit detected, current module when the discharge current of the lithium cell group that current detection unit detected is greater than the setting value, host system send the cell-phone through GPRS to whether receive the instruction of cell-phone and control the disconnection of field effect transistor Q2.
4. The intelligent protection circuit for lithium batteries according to claim 2, characterized in that: still include vibration sensor and alarm device, vibration sensor and alarm device all with host system link to each other, host system when gathering the vibration range that vibration sensor rolled out and being greater than the setting value, trigger alarm device and report to the police, improve the smart mobile phone through GPRS simultaneously.
5. The intelligent protection circuit for lithium batteries according to claim 1, characterized in that: the input end of the communication module is also provided with a voltage stabilizing module, the voltage stabilizing module comprises a current limiting resistor R13 which is connected in series with a TX pin in the input end of the communication module, a current limiting resistor R22 which is connected in series with an RX pin, a voltage stabilizing diode ZD4, a voltage stabilizing diode ZD5, a resistor R25 and a resistor R24; two ends of the voltage-stabilizing diode ZD4 and the resistor R25 are respectively connected between the other end of the current-limiting resistor R13 and the ground, and two ends of the voltage-stabilizing diode ZD5 and the resistor R24 are respectively connected between the other end of the current-limiting resistor R22 and the ground.
6. The intelligent protection circuit for lithium batteries according to claim 5, characterized in that: the input end of the communication module is also provided with a communication control switch module, the communication control switch module comprises a switch tube M1 and a switch tube M2, a control signal TR generated by the main control module is connected with the P pole of a diode D3, the N pole of the diode D3 is respectively connected with one end of a resistor R12 and one end of a resistor R17, the other end of the resistor R12 is respectively connected with the G pole of the switch tube M1 and one end of the resistor R11, the other end of the resistor R17 is respectively connected with the G pole of the switch tube M2 and one end of a resistor R18, and the other end of the resistor R11 and the other end of the resistor R18 are connected with the high-;
the TX pin of the communication input end is connected with the S pole of the switch tube M1 through a current limiting resistor R13, and the D pole of the switch tube M1 is connected with the TXD pin of the communication output port;
an RX pin of the communication input end is connected with an S pole of the switch tube M2 through a current limiting resistor R22, and a D pin of the switch tube M2 is connected with an RXD pin of the communication output end.
7. The intelligent protection circuit for lithium batteries according to claim 6, characterized in that: the high-voltage protection module comprises a diode D6, a Zener diode ZD3, a Zener diode ZD6, a triode Q7, a capacitor C13, a resistor R25, a resistor R34 and a resistor R35;
the RXD pin of the communication output end is grounded through a voltage stabilizing diode ZD3, a resistor R25 and a resistor R35; the common terminal of the resistor R25 and the resistor R35 is connected with the b pole of the triode Q7;
the other ends of the resistor R11 and the resistor R18 are respectively connected with the P pole of the diode D6, the resistor R34, one end of the capacitor C13 and the K pole of the zener diode ZD 6;
the N pole of the diode D is connected with the C pole of the triode Q7, and the E pole of the triode Q7 is grounded;
the resistor R34, the other end of the capacitor C13 and the A pole of the zener diode ZD6 are grounded.
8. The intelligent protection circuit for lithium batteries according to claim 7, wherein: the communication module also comprises an electrostatic protection module which comprises a diode D4 and a diode D5; the N poles of the diode D4 and the diode D5 are respectively connected with the RXD pin and the TXD pin of the communication output end, and the P poles of the diodes are grounded.
9. The intelligent protection circuit for lithium batteries according to any one of claims 1 to 8, characterized in that: still include wading water power-off circuit, wading water power-off circuit include water trigger circuit, water trigger circuit's output and host system's overcurrent protection sense terminal electricity be connected, water trigger circuit's input and lithium cell intelligent protection circuit positive negative pole output are regarded as receiving water induction end together, when host system detected water trigger circuit's output is the high level, make charging field effect transistor Q1, discharge field effect transistor Q2 end.
10. The intelligent protection circuit for lithium batteries according to claim 9, characterized in that: the water trigger circuit comprises a triode U2 and a resistor R1, an emitting electrode of the triode is connected with a connecting line between the positive input end of the lithium battery core and the positive output end of the lithium battery intelligent protection circuit, a base electrode of the triode is connected with a water-receiving induction end near the positive output end and the negative output end of the lithium battery intelligent protection circuit, and a collector electrode of the triode is connected with the resistor R1 and the main control module; the other end of the resistor R1 is connected with the negative electrode output end of the intelligent protection circuit 4 for the lithium battery, and the main control module controls the charging field-effect transistor Q1 and the discharging field-effect transistor Q2 to be cut off when detecting that the resistor R1 has a high level.
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| CN201922469870.4U CN211320973U (en) | 2019-12-31 | 2019-12-31 | Lithium cell intelligence protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510776A (en) * | 2020-11-24 | 2021-03-16 | 重庆辉腾能源股份有限公司 | Intelligent working method of multifunctional portable power supply |
| WO2023070491A1 (en) * | 2021-10-29 | 2023-05-04 | 深圳市菲尼基科技有限公司 | Integrated lithium battery protection board of low-speed vehicle |
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2019
- 2019-12-31 CN CN201922469870.4U patent/CN211320973U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112510776A (en) * | 2020-11-24 | 2021-03-16 | 重庆辉腾能源股份有限公司 | Intelligent working method of multifunctional portable power supply |
| CN112510776B (en) * | 2020-11-24 | 2022-11-29 | 重庆辉腾能源股份有限公司 | Intelligent working method of multifunctional portable power supply |
| WO2023070491A1 (en) * | 2021-10-29 | 2023-05-04 | 深圳市菲尼基科技有限公司 | Integrated lithium battery protection board of low-speed vehicle |
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