CN111313510A - Lithium iron phosphate battery protection board - Google Patents
Lithium iron phosphate battery protection board Download PDFInfo
- Publication number
- CN111313510A CN111313510A CN202010255634.7A CN202010255634A CN111313510A CN 111313510 A CN111313510 A CN 111313510A CN 202010255634 A CN202010255634 A CN 202010255634A CN 111313510 A CN111313510 A CN 111313510A
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- China
- Prior art keywords
- iron phosphate
- lithium iron
- charging
- series
- battery protection
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
Abstract
The invention aims to provide a lithium iron phosphate battery protection board, which comprises: one end of the discharge MOS tube is connected to the anode of the lithium iron phosphate battery connected in series; one end of the charging MOS tube is connected with the other end of the discharging MOS tube, and the other end of the charging MOS tube is connected to the anode of the output end of the system; one end of the current limiting module is connected to the common end of the charging MOS tube and the discharging MOS tube; the other end of the current limiting module is connected to the MCU main control unit; the pre-charging module is connected to the MCU main control unit; the current detection resistor is connected in series between the negative electrodes of the lithium iron phosphate batteries connected in series and the negative electrode of the output end of the system, and the current detection resistor is connected with the MCU main control unit; the voltage sampling equalization module is connected with the lithium iron phosphate batteries connected in series; the AFE energy feedback unit is respectively connected with the voltage sampling equalization module and the MCU main control unit, and the invention can effectively monitor and protect the charge and discharge of the battery pack in real time.
Description
Technical Field
The invention relates to a lithium iron phosphate battery protection plate.
Background
As a novel environment-friendly, high-efficiency and instant power battery capable of discharging large current, the lithium iron phosphate battery has unique performance which is gradually accepted by the market, and is mainly applied to solar street lamps, electric tools, automobiles and trains at present. In the fields of high-speed rails and the like, the reference voltage of a lithium iron phosphate power battery is 3, 2V, in order to meet the use requirement, a plurality of batteries are required to be connected in series to reach the required voltage, and after the same batch of battery cores are manufactured, the capacity and the internal resistance of the battery cores have difference conductance, so that the batteries with smaller difference conductance are matched into one group before combination, so as to achieve the purpose of prolonging the cycle service life of the batteries to a certain extent.
For a battery pack formed by a plurality of batteries connected in series, each battery of the battery pack needs to be charged and discharged, and the solar street lamp needs to adopt higher input voltage or even instantly variable voltage, so that the conventional universal battery protection board cannot meet the popularization and application of the batteries in the solar field, and the popularization of the battery protection board in the field is hindered.
In order to solve the problem, an electronic device with high voltage withstanding value and transient large current impact resistance must be adopted, so that the size is large, the cost is high, and the electronic device cannot meet the technical development requirement.
Disclosure of Invention
An object of the present invention is to provide a lithium iron phosphate battery protection board.
The present invention provides a lithium iron phosphate battery protection board, including:
one end of the discharge MOS tube is connected to the anode of the lithium iron phosphate batteries connected in series;
one end of the charging MOS tube is connected with the other end of the discharging MOS tube, and the other end of the charging MOS tube is connected to the anode of the output end of the system;
one end of the current limiting module is connected to the common end of the charging MOS tube and the discharging MOS tube;
the other end of the current limiting module is connected to the MCU main control unit;
the pre-charging module is connected to the MCU main control unit;
the current detection resistor is connected between the negative electrodes of the lithium iron phosphate batteries connected in series and the negative electrode of the output end of the system in series, and the current detection resistor is connected with the MCU main control unit;
the voltage sampling and balancing module is connected with the lithium iron phosphate batteries connected in series;
and the AFE energy feedback unit is respectively connected with the voltage sampling equalization module and the MCU main control unit.
Further, in the lithium iron phosphate battery protection board, the current limiting module is used for receiving a control signal of the MCU main control unit; the current detection resistor is used for detecting the output current of the system and sending a detection signal to the MCU main control unit; and the voltage sampling and balancing module is used for collecting the voltage of each battery in the lithium iron phosphate batteries connected in series.
Further, in the lithium iron phosphate battery protection board, the protection board further includes:
the LED heating device comprises a storage module, a heating module, a communication module, an LCD module and an LED module, wherein the storage module, the heating module, the communication module, the LCD module and the LED module are respectively connected to the MCU main control unit.
Further, in the above-mentioned lithium iron phosphate battery protection board, the LED module has 6 LED lamps to instruct, wherein, 4 white LED lamps are electric quantity indicator lamp for current battery pack residual capacity indicator lamp, and 1 red LED lamp is for reporting an emergency and asking for help or increased vigilance, trouble pilot lamp when protecting, and 1 white LED lamp is battery standby, charging, discharge status pilot lamp.
Further, in the lithium iron phosphate battery protection board, the protection board further includes:
and the NTC sampling module is connected with the lithium iron phosphate batteries connected in series, and the AFE energy feedback unit is connected with the NTC sampling module.
Further, in the lithium iron phosphate battery protection board, the NTC sampling module is used for collecting the temperature and the ambient temperature of the lithium iron phosphate batteries connected in series.
Further, in the lithium iron phosphate battery protection board, in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is higher than a high-temperature protection set value, the lithium iron phosphate battery protection board enters high-temperature protection, the charging MOS transistor and the discharging MOS transistor are both disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; when the temperature of each battery in the series-connected lithium iron phosphate batteries is lower than a high-temperature recovery value, the lithium iron phosphate battery protection board recovers charging or discharging.
Further, in the lithium iron phosphate battery protection board, in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is lower than a low-temperature protection set value, the lithium iron phosphate battery protection board enters low-temperature protection, the charging MOS transistor and the discharging MOS transistor are both disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; and when the temperature of each battery in the series-connected lithium iron phosphate batteries is higher than a low-temperature recovery value, the lithium iron phosphate batteries are protected to recover charging or discharging.
Further, in the lithium iron phosphate battery protection board, when the NTC sampling module detects that the ambient temperature is higher than the ambient high-temperature set value, the lithium iron phosphate battery protection board gives an alarm, and the lithium iron phosphate battery protection board does not stop charging and discharging; when the NTC sampling module detects that the power temperature is higher than a power protection set value, the lithium iron phosphate battery protection enters power high-temperature protection, the charging MOS tube and the discharging MOS tube are both disconnected, and the lithium iron phosphate battery protection stops charging and discharging.
Further, in the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of any one battery in the lithium iron phosphate batteries connected in series is higher than a monomer overcharge protection set value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS tube is closed, and the charging device stops charging the lithium iron phosphate batteries connected in series; after the monomer overvoltage protection, when one battery with the highest monomer voltage in the series-connected lithium iron phosphate batteries is reduced to be below a monomer overcharge recovery value and the residual electric quantity of the series-connected lithium iron phosphate batteries is lower than 96%, the overcharge protection state is removed, and the charging MOS tube is switched on.
Further, in the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the total voltage of the lithium iron phosphate batteries connected in series is higher than a total voltage overcharge protection set value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS tube is turned off, and the charging device stops charging the lithium iron phosphate batteries connected in series; and when the total voltage drops below a total voltage overcharge recovery value and the residual electric quantity of the lithium iron phosphate batteries connected in series is lower than 96%, removing an overcharge protection state and switching on the charging MOS tube.
Further, in the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of any one battery in the lithium iron phosphate batteries connected in series is lower than a monomer over-discharge protection set value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS tube is closed, the load stops discharging for the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is shut down after communication is maintained for 1 minute; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or after the reset key operation, the lithium iron phosphate battery protection board is started to detect whether the voltage of the series-connected lithium iron phosphate batteries reaches a recovery value again.
Further, in the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of the lithium iron phosphate batteries connected in series is lower than a total pressure over-discharge protection set value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS tube is closed, the load stops discharging for the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is shut down after communication is maintained for 1 minute; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or through the operation of a reset key, the lithium iron phosphate battery protection board is started to detect whether the voltage of the battery pack reaches a recovery value again.
Further, in the lithium iron phosphate battery protection board, when the current detection resistor detects that the charging current exceeds the charging overcurrent protection set value and reaches the delay time, the lithium iron phosphate battery protection board enters charging overcurrent protection, the charging MOS tube is closed, and the charging device stops charging the battery;
after the charging overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays to recover, the charging MOS tube is switched on, and the current of the external charger is detected again.
Further, in the lithium iron phosphate battery protection board, when the current detection resistor detects that the discharge current exceeds the discharge overcurrent protection set value and reaches the delay time, the lithium iron phosphate battery protection board enters discharge overcurrent protection, the discharge MOS tube is disconnected, and the load stops charging the battery;
after the discharge overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays and recovers, the discharge MOS tube is switched on, and the external load current is detected again.
Compared with the prior art, the invention comprises the following steps: one end of the discharge MOS tube is connected to the anode of the lithium iron phosphate batteries connected in series; one end of the charging MOS tube is connected with the other end of the discharging MOS tube, and the other end of the charging MOS tube is connected to the anode of the output end of the system; one end of the current limiting module is connected to the common end of the charging MOS tube and the discharging MOS tube; the other end of the current limiting module is connected to the MCU main control unit; the pre-charging module is connected to the MCU main control unit; the current detection resistor is connected between the negative electrodes of the lithium iron phosphate batteries connected in series and the negative electrode of the output end of the system in series, and the current detection resistor is connected with the MCU main control unit; the voltage sampling and balancing module is connected with the lithium iron phosphate batteries connected in series; the AFE energy feedback unit is respectively connected with the voltage sampling equalization module and the MCU main control unit, and the battery pack charging and discharging monitoring system can effectively monitor and protect the charging and discharging of the battery pack in real time.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
fig. 1 is a schematic diagram of a lithium iron phosphate battery protection board according to an embodiment of the present invention.
The same or similar reference numbers in the drawings identify the same or similar elements.
Detailed Description
The present invention is described in further detail below with reference to the attached drawing figures.
As shown in fig. 1, the present invention provides a lithium iron phosphate battery protection board, including:
a discharge MOS tube 1, one end of which is connected to the positive electrode (B +) of the series-connected lithium iron phosphate batteries;
specifically, the lithium iron phosphate batteries connected in series can be formed by connecting 16 lithium iron phosphate batteries in series;
a charging MOS tube 2, one end of which is connected with the other end of the discharging MOS tube, and the other end of which is connected to the positive pole (P +) of the output end of the system;
one end of the current limiting module 3 is connected to the common end of the charging MOS tube and the discharging MOS tube so as to control the maximum current of the charging MOS tube and the discharging MOS tube;
the other end of the current limiting module is connected to the MCU main control unit, and the current limiting module receives a control signal of the MCU main control unit;
the pre-charging module 5 is connected to the MCU main control unit and is used for receiving or sending related information to determine a working mode;
preferably, the lithium iron phosphate battery protection board further includes: the device comprises a storage module 6, a heating module 7, a communication module 8, an LCD module 9 and an LED module 10, wherein the storage module, the heating module, the communication module, the LCD module and the LED module are respectively connected to the MCU main control unit so as to receive and execute the command of the MCU main control unit;
preferably, the lithium iron phosphate battery protection board further includes: the current detection resistor 11 is connected in series between a negative electrode (B-) of the lithium iron phosphate batteries connected in series and a negative electrode (P-) of an output end of the system, is connected with the MCU main control unit, and is used for detecting output current of the system and sending a detection signal to the MCU main control unit;
the charging and discharging current of the battery pack is collected and monitored in real time through a current detection resistor connected between the negative electrode B-of the battery and the output end P-of the system, so that the charging current and the discharging current are alarmed and protected. The temperature rise is less than 40 ℃, and the precision is better than +/-1%.
The voltage sampling and balancing module 12 is connected with the lithium iron phosphate batteries connected in series and is used for collecting the voltage of each battery in the lithium iron phosphate batteries connected in series;
the system can realize the real-time acquisition and monitoring of the voltage of the 8-16-section series-connection battery cell through the voltage sampling equalization module, so as to realize the over-voltage and under-voltage alarm and protection of the battery cell. The voltage detection precision of the battery cell is +/-10 mV at the temperature of 0-45 ℃ and +/-30 mV at the temperature of-20-70 ℃. The alarm and protection parameter set values can be changed through the upper computer.
The NTC sampling module 13 is connected with the lithium iron phosphate batteries connected in series and is used for acquiring the temperature and the ambient temperature of the lithium iron phosphate batteries connected in series;
herein, the cell temperature, the ambient temperature and the power board temperature are collected and monitored in real time through the NTC sampling module, so as to realize high-temperature and low-temperature alarm and protection. The temperature detection precision is +/-2 ℃. The alarm and protection parameter set values can be changed through the upper computer.
And the AFE energy feedback unit 14 is respectively connected with the voltage sampling equalization module, the NTC sampling module and the MCU main control unit, and transmits voltage and temperature information and receives and executes a command of the MCU main control unit.
In addition, the alarm and protection parameter set values can be changed by connecting the upper computer with the communication module.
The current detection resistor and the current limiting module can realize the detection and protection functions of output short circuit.
The invention can also be used for calculating the residual capacity of the battery in real time, the learning of the total charge and discharge capacity is completed at one time, and the SOC estimation precision is better than +/-5 percent. The battery has the function of calculating the number of charge-discharge cycles, and when the accumulated discharge capacity of the battery pack reaches 20% of the set full capacity, the cycle number is increased once, and the set value of the battery cycle capacity parameter can be changed through the upper computer.
The charging MOSFET switch and the discharging MOSFET switch adopt low internal resistance and large current, and are optimally designed aiming at the startup, zero switching and twice charging withstand voltage of a large-capacitance capacitive load applied by a backup power supply.
When charging, the unbalanced battery cores can be balanced, and the service time and the cycle life of the battery can be effectively prolonged. The equalizing start voltage and the equalizing pressure difference can be set through the upper computer.
Optionally, the LED module has 6 LED lights for indication, wherein, 4 white LED lights are electric quantity indicator lights as current battery pack remaining electric quantity (SOC) indicator lights, 1 red LED light is a fault indicator light when alarming and protecting, and 1 white LED light is a battery standby, charging and discharging status indicator light.
Preferably, the lithium iron phosphate battery protection Board (BMS) of the present invention may further have a manual and automatic sleep function, and the battery automatically sleeps for 48 hours without external charging and discharging. The BMS enters a sleep state while maintaining the 1 minute communication when the battery pack is over-discharged for protection. Accessible manual 6S that presses reset button, 6 LED lamps light the back in proper order, and BMS gets into the dormancy. The standby dormancy can be set through the upper computer.
The PC or the intelligent front end can realize data monitoring, operation control and parameter setting of the battery through the communication module through commands such as remote measurement, remote signaling, remote regulation, remote control and the like. The terminal equipment CAN read the sum of the battery data of all parallel PACKs through the CAN interface.
The historical data is stored in the storage module when the state transition occurs according to the BMS; storing measurement data of various alarms, protection triggers and elimination in real time; the recording start time, the recording end time and the recording interval time can be set through the communication module to store the measurement data in a certain time period. And reading the historical data through an upper computer, and storing the historical data as an excel file into a computer.
The battery management parameters such as the over-voltage and under-voltage of the single battery, the total voltage of the battery, the charging and discharging overcurrent, the high and low temperature of the battery core, the high and low temperature of the environment, the balancing strategy, the serial number of the batteries, the battery capacity and the like can be reset through the upper computer.
The voltage-related function, the temperature-related function, the current-related function (the output short-circuit function does not support the turn-off setting), the capacity-related function, and the like can be turned on or off through the setting of the upper computer.
In an embodiment of the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of any one battery in the lithium iron phosphate batteries connected in series is higher than a monomer overcharge protection set value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS tube is closed, and the charging device stops charging the lithium iron phosphate batteries connected in series; after the monomer overvoltage protection, when one battery with the highest monomer voltage in the series-connected lithium iron phosphate batteries is reduced to be below a monomer overcharge recovery value and the residual electric quantity (SOC) of the series-connected lithium iron phosphate batteries is lower than 96%, the overcharge protection state is removed, and the charging MOS tube is switched on and can also be discharged.
In an embodiment of the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the total voltage of the lithium iron phosphate batteries connected in series is higher than a total voltage overcharge protection set value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS tube is turned off, and the charging device stops charging the lithium iron phosphate batteries connected in series; and when the total voltage drops below a total voltage overcharge recovery value and the residual electricity quantity (SOC) of the lithium iron phosphate batteries connected in series is lower than 96%, removing an overcharge protection state, and turning on the charging MOS tube or removing discharge.
In an embodiment of the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of any one battery in the lithium iron phosphate batteries connected in series is lower than a monomer over-discharge protection set value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS tube is closed, the load stops discharging for the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is shut down after 1-minute communication is maintained; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or after the reset key operation, the lithium iron phosphate battery protection board is started to detect whether the voltage of the series-connected lithium iron phosphate batteries reaches a recovery value again.
In an embodiment of the lithium iron phosphate battery protection board, when the voltage sampling equalization module detects that the voltage of the lithium iron phosphate batteries connected in series is lower than a total pressure over-discharge protection set value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS tube is closed, the load stops discharging for the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is shut down after communication is maintained for 1 minute; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or through the operation of a reset key, the lithium iron phosphate battery protection board is started to detect whether the voltage of the battery pack reaches a recovery value again.
In an embodiment of the lithium iron phosphate battery protection board, when the current detection resistor detects that the charging current exceeds the charging overcurrent protection set value and reaches the delay time, the lithium iron phosphate battery protection board enters charging overcurrent protection, the charging MOS tube is closed, and the charging equipment stops charging the battery;
after charging overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays to recover, the charging MOS tube is switched on, the current of an external charger is detected again, and charging overcurrent protection can be removed through discharging.
In an embodiment of the lithium iron phosphate battery protection board, when the current detection resistor detects that the discharge current exceeds the discharge overcurrent protection set value and reaches the delay time, the lithium iron phosphate battery protection board enters discharge overcurrent protection, the discharge MOS tube is disconnected, and the load stops charging the battery;
after the discharge overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays and recovers, the discharge MOS tube is switched on, the external load current is detected again, and the discharge overcurrent protection can be removed during charging.
In addition, the discharge overcurrent protection can have secondary protection, and the transient overcurrent protection and the discharge overcurrent protection can be recovered as same. The number of transient overcurrent protection is locked when reaching the condition, and the recovery is carried out by shutting down the computer at the start-up or removing the charging.
Preferably, in the aspect of temperature protection, the BMS may detect 6 temperature detection ports through NTC sampling, and monitor temperature changes in real time to achieve a protective measure.
In an embodiment of the lithium iron phosphate battery protection board, in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is higher than a high-temperature protection set value, the lithium iron phosphate battery protection board enters high-temperature protection, both the charging MOS transistor and the discharging MOS transistor are disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; when the temperature of each battery in the series-connected lithium iron phosphate batteries is lower than a high-temperature recovery value, the lithium iron phosphate battery protection board recovers charging or discharging.
In an embodiment of the lithium iron phosphate battery protection board, in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is lower than a low-temperature protection set value, the lithium iron phosphate battery protection board enters low-temperature protection, both the charging MOS transistor and the discharging MOS transistor are disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; and when the temperature of each battery in the series-connected lithium iron phosphate batteries is higher than a low-temperature recovery value, the lithium iron phosphate batteries are protected to recover charging or discharging.
In an embodiment of the lithium iron phosphate battery protection board, when the NTC sampling module detects that the ambient temperature is higher than the ambient high-temperature set value, the lithium iron phosphate battery protection board gives an alarm, and the lithium iron phosphate battery protection board does not stop charging and discharging; when the NTC sampling module detects that the power temperature is higher than a power protection set value, the lithium iron phosphate battery protection enters power high-temperature protection, the charging MOS tube and the discharging MOS tube are both disconnected, and the lithium iron phosphate battery protection stops charging and discharging.
The invention provides a special protection plate for a lithium iron phosphate battery, which can effectively monitor and protect the charge and discharge of a battery pack in real time through the special protection plate, can prevent the battery pack from having safety protection functions such as overcharge, overdischarge, overheating and overcurrent, and ensures the safe and effective operation of the battery pack. The invention can ensure that the battery can still be protected from fire when the power tube of the circuit board is short-circuited at high temperature and outside.
The existing lithium iron phosphate battery protection board has the defects that the battery is damaged and even a fire disaster is possibly caused under the condition that a high-temperature power tube or a short-circuit power tube is damaged and short-circuited. The lithium iron phosphate battery protection board can effectively solve the problems. The lithium iron phosphate battery protection board provided by the invention is mainly used for an integrated circuit board which plays a role in protecting a rechargeable lithium iron phosphate battery, and can effectively prevent the battery from being overcharged, overdischarged, overcurrent, short-circuited and safe in an ultrahigh-temperature working environment.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. The terms first, second, etc. are used to denote names, but not any particular order.
Claims (15)
1. The utility model provides a lithium iron phosphate battery protection board, wherein, this lithium iron phosphate battery protection board includes:
one end of the discharge MOS tube is connected to the anode of the lithium iron phosphate batteries connected in series;
one end of the charging MOS tube is connected with the other end of the discharging MOS tube, and the other end of the charging MOS tube is connected to the anode of the output end of the system;
one end of the current limiting module is connected to the common end of the charging MOS tube and the discharging MOS tube;
the other end of the current limiting module is connected to the MCU main control unit;
the pre-charging module is connected to the MCU main control unit;
the current detection resistor is connected between the negative electrodes of the lithium iron phosphate batteries connected in series and the negative electrode of the output end of the system in series, and the current detection resistor is connected with the MCU main control unit;
the voltage sampling and balancing module is connected with the lithium iron phosphate batteries connected in series;
and the AFE energy feedback unit is respectively connected with the voltage sampling equalization module and the MCU main control unit.
2. The lithium iron phosphate battery protection board according to claim 1, wherein the current limiting module is configured to receive a control signal of an MCU main control unit; the current detection resistor is used for detecting the output current of the system and sending a detection signal to the MCU main control unit; and the voltage sampling and balancing module is used for collecting the voltage of each battery in the lithium iron phosphate batteries connected in series.
3. The lithium iron phosphate battery protection plate as claimed in claim 1, further comprising:
the LED heating device comprises a storage module, a heating module, a communication module, an LCD module and an LED module, wherein the storage module, the heating module, the communication module, the LCD module and the LED module are respectively connected to the MCU main control unit.
4. The lithium iron phosphate battery protection board as claimed in claim 3, wherein the LED module has 6 LED lamps, wherein 4 white LED lamps are power indicator lamps and current battery pack remaining power indicator lamps, 1 red LED lamp is a fault indicator lamp for warning and protection, and 1 white LED lamp is a battery standby, charging and discharging status indicator lamp.
5. The lithium iron phosphate battery protection plate as claimed in claim 1, further comprising:
and the NTC sampling module is connected with the lithium iron phosphate batteries connected in series, and the AFE energy feedback unit is connected with the NTC sampling module.
6. The lithium iron phosphate battery protection panel according to claim 5, wherein the NTC sampling module is configured to collect the temperature of the lithium iron phosphate batteries connected in series and the ambient temperature.
7. The lithium iron phosphate battery protection board according to claim 5, wherein in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is higher than a high-temperature protection set value, the lithium iron phosphate battery protection board enters high-temperature protection, the charging MOS transistor and the discharging MOS transistor are both disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; when the temperature of each battery in the series-connected lithium iron phosphate batteries is lower than a high-temperature recovery value, the lithium iron phosphate battery protection board recovers charging or discharging.
8. The lithium iron phosphate battery protection board according to claim 5, wherein in a charging and discharging state, when the NTC sampling module detects that the temperature of any one of the lithium iron phosphate batteries connected in series is lower than a low-temperature protection set value, the lithium iron phosphate battery protection board enters low-temperature protection, the charging MOS transistor and the discharging MOS transistor are both disconnected, and the lithium iron phosphate battery protection board stops charging or discharging; and when the temperature of each battery in the series-connected lithium iron phosphate batteries is higher than a low-temperature recovery value, the lithium iron phosphate batteries are protected to recover charging or discharging.
9. The lithium iron phosphate battery protection board according to claim 5, wherein when the NTC sampling module detects that the ambient temperature is higher than the ambient high temperature set value, the lithium iron phosphate battery protection board alarms and does not stop charging and discharging; when the NTC sampling module detects that the power temperature is higher than a power protection set value, the lithium iron phosphate battery protection enters power high-temperature protection, the charging MOS tube and the discharging MOS tube are both disconnected, and the lithium iron phosphate battery protection stops charging and discharging.
10. The lithium iron phosphate battery protection board according to claim 1, wherein when the voltage sampling and equalizing module detects that the voltage of any one of the lithium iron phosphate batteries in the series connection is higher than a set single overcharge protection value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS tube is turned off, and the charging device stops charging the lithium iron phosphate batteries in the series connection; after the monomer overvoltage protection, when one battery with the highest monomer voltage in the series-connected lithium iron phosphate batteries is reduced to be below a monomer overcharge recovery value and the residual electric quantity of the series-connected lithium iron phosphate batteries is lower than 96%, the overcharge protection state is removed, and the charging MOS tube is switched on.
11. The lithium iron phosphate battery protection board according to claim 1, wherein when the voltage sampling equalization module detects that the total voltage of the lithium iron phosphate batteries connected in series is higher than a total voltage overcharge protection set value, the lithium iron phosphate battery protection board enters an overcharge protection state, the charging MOS transistor is turned off, and the charging device stops charging the lithium iron phosphate batteries connected in series; and when the total voltage drops below a total voltage overcharge recovery value and the residual electric quantity of the lithium iron phosphate batteries connected in series is lower than 96%, removing an overcharge protection state and switching on the charging MOS tube.
12. The lithium iron phosphate battery protection board according to claim 1, wherein when the voltage sampling equalization module detects that the voltage of any one of the lithium iron phosphate batteries connected in series is lower than a set single over-discharge protection value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS tube is turned off, the load stops discharging the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is turned off after 1-minute communication is maintained; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or after the reset key operation, the lithium iron phosphate battery protection board is started to detect whether the voltage of the series-connected lithium iron phosphate batteries reaches a recovery value again.
13. The lithium iron phosphate battery protection board according to claim 1, wherein when the voltage sampling equalization module detects that the voltage of the lithium iron phosphate batteries connected in series is lower than a total voltage over-discharge protection set value, the lithium iron phosphate battery protection board enters an over-discharge protection state, the discharge MOS transistor is turned off, the load stops discharging the lithium iron phosphate batteries connected in series, and the lithium iron phosphate battery protection board is turned off after 1-minute communication; after the over-discharge protection occurs, the series-connected lithium iron phosphate batteries are charged to relieve the over-discharge protection state, or through the operation of a reset key, the lithium iron phosphate battery protection board is started to detect whether the voltage of the battery pack reaches a recovery value again.
14. The lithium iron phosphate battery protection board according to claim 1, wherein when the current detecting resistor detects that the charging current exceeds the charging overcurrent protection set value and reaches a delay time, the lithium iron phosphate battery protection board enters charging overcurrent protection, the charging MOS tube is turned off, and the charging device stops charging the battery;
after the charging overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays to recover, the charging MOS tube is switched on, and the current of the external charger is detected again.
15. The lithium iron phosphate battery protection board according to claim 1, wherein when the current detection resistor detects that the discharge current exceeds the discharge overcurrent protection set value and reaches a delay time, the lithium iron phosphate battery protection board enters discharge overcurrent protection, the discharge MOS transistor is turned off, and the load stops charging the battery;
after the discharge overcurrent protection occurs, the lithium iron phosphate battery protection board automatically delays and recovers, the discharge MOS tube is switched on, and the external load current is detected again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010255634.7A CN111313510A (en) | 2020-04-02 | 2020-04-02 | Lithium iron phosphate battery protection board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010255634.7A CN111313510A (en) | 2020-04-02 | 2020-04-02 | Lithium iron phosphate battery protection board |
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| CN111313510A true CN111313510A (en) | 2020-06-19 |
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| CN202010255634.7A Pending CN111313510A (en) | 2020-04-02 | 2020-04-02 | Lithium iron phosphate battery protection board |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112152303A (en) * | 2020-11-02 | 2020-12-29 | 沈阳铁道科学技术研究所有限公司 | Wide temperature protection device of lithium iron phosphate battery |
| CN113452122A (en) * | 2021-07-22 | 2021-09-28 | 中国电力科学研究院有限公司 | Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation |
| CN113472036A (en) * | 2021-06-23 | 2021-10-01 | 广东博力威科技股份有限公司 | Battery control method, device, equipment and medium for explosive detector |
| CN114089651A (en) * | 2021-09-30 | 2022-02-25 | 双登集团股份有限公司 | Voltage type abnormal protection mode |
| CN114814596A (en) * | 2022-03-09 | 2022-07-29 | 深圳市南霸科技有限公司 | Electric quantity detection device |
| WO2023279651A1 (en) * | 2021-07-09 | 2023-01-12 | 浙江天宏锂电股份有限公司 | Lithium iron phosphate battery pack control system and method for electric motorcycle |
| WO2023056650A1 (en) * | 2021-10-09 | 2023-04-13 | 深圳市华思旭科技有限公司 | Charging/discharging protection apparatus and starting power-supply device |
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2020
- 2020-04-02 CN CN202010255634.7A patent/CN111313510A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112152303A (en) * | 2020-11-02 | 2020-12-29 | 沈阳铁道科学技术研究所有限公司 | Wide temperature protection device of lithium iron phosphate battery |
| CN113472036A (en) * | 2021-06-23 | 2021-10-01 | 广东博力威科技股份有限公司 | Battery control method, device, equipment and medium for explosive detector |
| WO2023279651A1 (en) * | 2021-07-09 | 2023-01-12 | 浙江天宏锂电股份有限公司 | Lithium iron phosphate battery pack control system and method for electric motorcycle |
| CN113452122A (en) * | 2021-07-22 | 2021-09-28 | 中国电力科学研究院有限公司 | Lithium iron phosphate battery direct-current power supply balancing system, method and equipment for transformer substation |
| CN114089651A (en) * | 2021-09-30 | 2022-02-25 | 双登集团股份有限公司 | Voltage type abnormal protection mode |
| WO2023056650A1 (en) * | 2021-10-09 | 2023-04-13 | 深圳市华思旭科技有限公司 | Charging/discharging protection apparatus and starting power-supply device |
| CN114814596A (en) * | 2022-03-09 | 2022-07-29 | 深圳市南霸科技有限公司 | Electric quantity detection device |
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