CN116094094A - Lithium battery pack monitoring system for monitoring long string serial connection - Google Patents
Lithium battery pack monitoring system for monitoring long string serial connection Download PDFInfo
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- CN116094094A CN116094094A CN202211635383.0A CN202211635383A CN116094094A CN 116094094 A CN116094094 A CN 116094094A CN 202211635383 A CN202211635383 A CN 202211635383A CN 116094094 A CN116094094 A CN 116094094A
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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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- 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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
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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
- H02J7/00302—Overcharge protection
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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
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
- H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a lithium battery pack monitoring system for monitoring long-string serial connection, which comprises a lithium battery pack, a server, a battery management chip, a charging analysis module, an intelligent early warning module, an environment monitoring parameter calculation module and a battery state evaluation module, wherein the charging analysis module carries out charging analysis on the lithium battery pack; the intelligent early warning module carries out intelligent early warning on the charging work of the lithium battery pack, the estimated charging time length of the lithium battery is obtained through the analysis of the charging analysis module, the intelligent early warning is carried out on the charging work of the lithium battery through the intelligent early warning module, a charging completion signal, a short message reminding signal or a forced power-off signal are generated according to a time point after the charging is finished, then the charging environment of the lithium battery is monitored through the environment monitoring parameter calculation module, the good charging environment of the lithium battery is guaranteed, meanwhile, the lithium battery is timely powered off when the charging is finished, and the influence on the service life of the lithium battery due to overcharge is avoided.
Description
Technical Field
The invention relates to the technical field of lithium battery pack monitoring, in particular to a lithium battery pack monitoring system for monitoring long-string serial connection.
Background
The lithium battery has the characteristics of light weight, large energy storage, large power, no pollution and the like, is widely applied in various fields, and in recent years, the research and the production of the lithium battery are greatly progressed. At present, lithium batteries occupy important positions in the fields of electric vehicles and new energy, and particularly, the application of lithium battery technology in the field of electric vehicles has stimulated research and development hot-air in the global scope.
The existing lithium battery pack cannot be charged and analyzed and monitored during charging, the charging environment and the charging condition in the charging process of the lithium battery are difficult to control, intelligent reminding cannot be carried out after the charging is finished, the lithium battery is overcharged, the service life of the lithium battery is greatly damaged, and the lithium battery pack is troublesome to compare, so that a lithium battery pack monitoring system for monitoring long-string serial connection is provided to solve the above-mentioned problems.
Disclosure of Invention
The present invention is directed to a lithium battery pack monitoring system for monitoring long strings of serial connection, so as to solve the problems set forth in the above-mentioned background art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a lithium battery pack monitoring system for monitoring long-string serial connection comprises a lithium battery pack, a server, a battery management chip, a charging analysis module, an intelligent early warning module, an environment monitoring parameter calculation module and a battery state evaluation module;
the lithium battery pack adopts a plurality of lithium ion batteries connected in series as a power supply;
the server sends the charging data and the charging environment data to the charging analysis module;
the battery management chip monitors the current voltage, charge and discharge current and temperature information of the lithium battery pack in real time through a peripheral monitoring circuit;
the charging analysis module is used for carrying out charging analysis on the lithium battery pack;
the intelligent early warning module carries out intelligent early warning on the charging work of the lithium battery pack, generates a charging completion signal, a short message reminding signal or a forced power-off signal and feeds back the charging completion signal, the short message reminding signal or the forced power-off signal to the server;
the environment monitoring parameter calculation module is used for calculating environment monitoring parameters of the lithium battery pack based on environment data of the environment where the lithium battery pack is located;
and the battery state evaluation module is used for performing state evaluation on the lithium battery pack.
As a further scheme of the invention: the battery management chip is MT9803, the MT9803 is a data acquisition IC which can measure the voltage of up to 12 batteries connected in series, an input multiplexer connects the batteries into a 12-bit delta-sigma analog-to-digital converter (ADC), and an internal 8 ppm/DEG C voltage reference is combined with the ADC, so that the MT9803 has more excellent measurement accuracy;
the MT9803 has three modes of operation: hardware shutdown, standby and measurement, the hardware shutdown being a true zero power mode, the standby mode being a power saving state (all circuits are off except the serial interface), in the measurement mode, MT9803 is used to measure the battery voltage and save the measurement results in memory, and in addition, the measurement mode will monitor Over Voltage (OV) and Under Voltage (UV) conditions of each battery.
As a further scheme of the invention: the hardware shutdown mode can disconnect the v+ pin from the C pin and the lithium battery pack, if the v+ power pin is 0V, the MT9803 will typically sink less than 1nA of current from the battery, at which time all circuits inside the IC are turned off; when v+=0v, communication with the IC is not possible.
As a further scheme of the invention: the standby mode is the working state with the lowest power supply current when being connected with the power supply, when V+ =44V, the standby current is usually 12 mu A, all circuits are turned off except a serial interface and a voltage stabilizer, all SPI logic inputs are set to logic 1 level in order to realize the lowest standby current consumption, and MT9803 can be programmed into the standby mode by setting the duty ratio configuration bits CDC [2:0] of a comparator to 0; if the device is placed in standby mode while the ADC measurements are in progress, the measurements will be interrupted and the battery voltage register will be in an indeterminate state, if the standby mode is to be exited, a non-zero value must be written to the CDC bit.
As a further scheme of the invention: the measurement mode, when CDC bit is set to a value of 1 to 7, MT9803 is in measurement mode, when cdc=1, MT9803 is in on state and waits for a start ADC conversion command; when the CDC bit has a value of 2 to 7, the IC will monitor each battery voltage and generate an interrupt signal on the SDO pin indicating that all battery voltages are within the limits of UV and OV, the value of the CDC bit determining the frequency of battery monitoring and the average power supply current consumption level;
the method for indicating the UV/OV interrupt status is level polling (using a high or low output signal), which is illustrated in the "serial port" section, with the UV/OV limit being set by the VUV and VOV values in the configuration registers, and when a certain battery voltage exceeds the UV/OV limit, a bit in the flag register will be set, and the UV and OV flag status of each battery can be determined using the set of read flag registers;
when the IC is in the measurement mode, it may be required to perform an ADC measurement at any time, and if it is desired to initiate a battery voltage measurement in the measurement mode, an initiate a/D conversion command is sent, after which the MT9803 will indicate the a/D converter status by level polling, and during execution of the battery voltage measurement command, the UV and OV flags (within the flag register set) are updated, and when the measurement is complete, the device will continue to monitor the UV and OV conditions at the frequency specified by the CDC bit.
As a further scheme of the invention: the charging analysis process of the charging analysis module specifically comprises the following steps:
step 1: the lithium battery is labeled u, u=1, 2,..z, z being a positive integer; acquiring the charging start time of the lithium battery, and recording the charging start time as CKTu;
step 2: acquiring charging current when the lithium battery is charged, and marking the charging current as CDLu; acquiring the battery capacity of the lithium battery, and marking the battery capacity as DRu;
step 3: calculating to obtain estimated charging time YTu of the lithium battery by combining a charging time calculation formula YTu = DRu/CDLu×60;
step 4: and adding the estimated charging time to the charging start time to obtain the charging end time CJTu of the lithium battery.
As a further scheme of the invention: the working process of the intelligent early warning module is specifically as follows:
s1, acquiring the current time TD1 of a system and the charging end time of a plurality of lithium batteries;
if TD < CJTu, calculating the remaining charging duration SYTu of the lithium battery by using the formula sytu=cjtu-TD 1, generating a charging completion signal after the remaining charging duration SYTu of the lithium battery, and immediately feeding back the charging completion signal to the server;
if TD is more than or equal to CJTu, generating a charging completion signal and immediately feeding the charging completion signal back to a server, sending the charging completion signal to a user terminal by the server, recording the sending time of the charging completion signal, and recording the sending time as the signal sending time;
s2, if the user terminal checks the charging completion signal, feeding back a charging stopping signal, and controlling the lithium battery to stop charging after receiving the charging stopping signal by the server;
s3, if the user terminal does not check the charging completion signal, a short message reminding signal is generated after the time t1, and is immediately fed back to the server, the server sends the short message reminding signal to the user terminal after generating a short message, and if the user terminal checks the short message reminding signal, a charging stopping signal is fed back, and the server controls the lithium battery to stop charging after receiving the charging stopping signal;
s4, if the user terminal does not check the short message reminding signal, a forced power-off signal is generated after time t2 and fed back to the server, the server controls the lithium battery to stop charging after receiving the forced power-off signal, and meanwhile the times of the forced power-off signal generated by the lithium battery are recorded and recorded as forced power-off times QDu; wherein t1 > t2.
As a further scheme of the invention: the environment monitoring parameter calculation module calculates environment calculation parameters of the lithium battery pack by adopting the following steps:
wherein T represents the difference between the working temperature of the lithium battery pack and the ambient temperature, H represents the humidity value of the environment where the lithium battery pack is located, and D represents the ring where the lithium battery pack is locatedAir dust content value, beta, omega in environment 4 、ω 5 、ω 6 Representing the corresponding scaling parameters, respectively.
As still further aspects of the invention: the battery state evaluation module is used for carrying out state evaluation on the abnormal battery by combining the attenuation rate obtained by the battery attenuation estimation unit through the abnormal battery estimation, the appearance monitoring parameters of the abnormal battery obtained by the appearance monitoring parameter calculation module and the environment monitoring parameters of the lithium battery pack obtained by the environment monitoring parameter calculation module.
Compared with the prior art, the invention has the beneficial effects that: this a lithium cell group monitoring system for monitoring long cluster concatenates is used for carrying out charge analysis to the lithium cell through the analysis module that charges, and the analysis obtains the prediction duration of charging of lithium cell to carry out intelligent early warning to the work of charging of lithium cell through intelligent early warning module, generate the completion signal that charges according to the time point after charging, SMS warning or forced outage signal, then monitor the charge environment of lithium cell through environmental monitoring parameter calculation module, guarantee that the lithium cell has good charge environment, in time outage when the lithium cell finishes simultaneously, avoid the lithium cell to overcharge to influence life.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of a charge management chip according to the present invention.
Detailed Description
In one embodiment, as shown in fig. 1-2, a lithium battery pack monitoring system for monitoring long-string serial connection comprises a lithium battery pack, a server, a battery management chip, a charging analysis module, an intelligent early warning module, an environment monitoring parameter calculation module and a battery state evaluation module; the lithium battery pack adopts a plurality of lithium ion batteries connected in series to form a group as a power supply; the server sends the charging data and the charging environment data to the charging analysis module; the battery management chip monitors the current voltage, charge and discharge current and temperature information of the lithium battery pack in real time through the peripheral monitoring circuit; the charging analysis module is used for carrying out charging analysis on the lithium battery pack; the intelligent early warning module carries out intelligent early warning on the charging work of the lithium battery pack, generates a charging completion signal, a short message reminding signal or a forced power-off signal and feeds back the charging completion signal, the short message reminding signal or the forced power-off signal to the server; the environment monitoring parameter calculation module is used for calculating environment monitoring parameters of the lithium battery pack based on environment data of the environment where the lithium battery pack is located; the battery state evaluation module is used for performing state evaluation on the lithium battery pack; the battery management chip is MT9803, the MT9803 is a data acquisition IC which can measure the voltage of up to 12 batteries connected in series, an input multiplexer connects the batteries into a 12-bit delta-sigma analog-to-digital converter (ADC), and an internal 8 ppm/DEG C voltage reference is combined with the ADC, so that the MT9803 has more excellent measurement accuracy; MT9803 has three modes of operation: hardware shutdown, standby and measurement, the hardware shutdown being a true zero power mode, the standby mode being a power saving state (all circuits are off except the serial interface), in the measurement mode, MT9803 is used to measure the battery voltage and save the measurement results in memory, and in addition, the measurement mode will monitor Over Voltage (OV) and Under Voltage (UV) conditions of each battery.
The hardware shutdown mode can disconnect the v+ pin from the C pin and the lithium battery pack, if the v+ power pin is 0V, the MT9803 will typically sink less than 1nA of current from the battery, at which time all circuitry inside the IC is turned off; when v+=0v, communication with the IC is not possible; the standby mode is the lowest power supply current operating state when connected to the power supply, and when v+=44v, the standby current is typically 12 μa, all circuits are turned off except the serial interface and the voltage regulator, all SPI logic inputs should be set to logic 1 level in order to achieve as low standby current consumption as possible, MT9803 can be programmed to standby mode by setting the comparator duty cycle configuration bits CDC [2:0] to 0; if the device is placed in standby mode while the ADC measurements are in progress, the measurements will be interrupted and the battery voltage register will be in an indeterminate state, if the standby mode is to be exited, a non-zero value must be written to the CDC bit; measurement mode, when CDC bit is set to a value of 1 to 7, MT9803 is in measurement mode, when cdc=1, MT9803 is in on state and waits for a start ADC conversion command; when the CDC bit has a value of 2 to 7, the IC will monitor each battery voltage and generate an interrupt signal on the SDO pin indicating that all battery voltages are within the limits of UV and OV, the value of the CDC bit determining the frequency of battery monitoring and the average power supply current consumption level; the method for indicating the UV/OV interrupt status is level polling (using a high or low output signal), which is illustrated in the "serial port" section, with the UV/OV limit being set by the VUV and VOV values in the configuration registers, and when a certain battery voltage exceeds the UV/OV limit, a bit in the flag register will be set, and the UV and OV flag status of each battery can be determined using the set of read flag registers; when the IC is in the measurement mode, it may be required to perform an ADC measurement at any time, and if it is desired to initiate a battery voltage measurement in the measurement mode, an initiate a/D conversion command is sent, after which the MT9803 will indicate the a/D converter status by level polling, and during execution of the battery voltage measurement command, the UV and OV flags (within the flag register set) are updated, and when the measurement is complete, the device will continue to monitor the UV and OV conditions at the frequency specified by the CDC bit.
The charging analysis process of the charging analysis module is specifically as follows:
step 1: the lithium battery is labeled u, u=1, 2,..z, z being a positive integer; acquiring the charging start time of the lithium battery, and recording the charging start time as CKTu;
step 2: acquiring charging current when the lithium battery is charged, and marking the charging current as CDLu; acquiring the battery capacity of the lithium battery, and marking the battery capacity as DRu;
step 3: calculating to obtain estimated charging time YTu of the lithium battery by combining a charging time calculation formula YTu = DRu/CDLu×60;
step 4: adding the estimated charging time to the charging start time to obtain the charging end time CJTu of the lithium battery;
and the charging analysis module feeds the charging end time of the lithium battery back to the server, and the server sends the charging end time of the lithium battery to the corresponding user terminal.
The working process of the intelligent early warning module is specifically as follows:
s1, acquiring the current time TD1 of a system and the charging end time of a plurality of lithium batteries;
if TD < CJTu, calculating the remaining charging duration SYTu of the lithium battery by using the formula sytu=cjtu-TD 1, generating a charging completion signal after the remaining charging duration SYTu of the lithium battery, and immediately feeding back the charging completion signal to the server;
if TD is more than or equal to CJTu, generating a charging completion signal and immediately feeding the charging completion signal back to a server, sending the charging completion signal to a user terminal by the server, recording the sending time of the charging completion signal, and recording the sending time as the signal sending time;
s2, if the user terminal checks the charging completion signal, feeding back a charging stopping signal, and controlling the lithium battery to stop charging after receiving the charging stopping signal by the server;
s3, if the user terminal does not check the charging completion signal, a short message reminding signal is generated after the time t1, and is immediately fed back to the server, the server sends the short message reminding signal to the user terminal after generating a short message, and if the user terminal checks the short message reminding signal, a charging stopping signal is fed back, and the server controls the lithium battery to stop charging after receiving the charging stopping signal;
s4, if the user terminal does not check the short message reminding signal, a forced power-off signal is generated after time t2 and fed back to the server, the server controls the lithium battery to stop charging after receiving the forced power-off signal, and meanwhile the times of the forced power-off signal generated by the lithium battery are recorded and recorded as forced power-off times QDu; wherein t1 > t2;
the intelligent early warning module feeds back the strong breaking times of the lithium battery to the server, and the server stores the strong breaking times of the lithium battery.
The environment monitoring parameter calculation module calculates environment calculation parameters of the lithium battery pack by adopting the following steps:
wherein T represents the difference between the working temperature of the lithium battery pack and the ambient temperature, and H represents the environment in which the lithium battery pack is locatedHumidity value, D represents the air dust content value, beta, omega in the environment of the lithium battery pack 4 、ω 5 、ω 6 Respectively representing the corresponding proportion coefficients;
the battery state evaluation module is used for carrying out state evaluation on the abnormal battery by combining the attenuation rate obtained by the battery attenuation estimation unit through estimation on the abnormal battery, the appearance monitoring parameter of the abnormal battery obtained by calculation of the appearance monitoring parameter calculation module and the environment monitoring parameter of the lithium battery pack obtained by calculation of the environment monitoring parameter calculation module.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. The lithium battery pack monitoring system for monitoring the long string serial connection is characterized by comprising a lithium battery pack, a server, a battery management chip, a charging analysis module, an intelligent early warning module, an environment monitoring parameter calculation module and a battery state evaluation module;
the lithium battery pack adopts a plurality of lithium ion batteries connected in series as a power supply;
the server sends the charging data and the charging environment data to the charging analysis module;
the battery management chip monitors the current voltage, charge and discharge current and temperature information of the lithium battery pack in real time through a peripheral monitoring circuit;
the charging analysis module is used for carrying out charging analysis on the lithium battery pack;
the intelligent early warning module carries out intelligent early warning on the charging work of the lithium battery pack, generates a charging completion signal, a short message reminding signal or a forced power-off signal and feeds back the charging completion signal, the short message reminding signal or the forced power-off signal to the server;
the environment monitoring parameter calculation module is used for calculating environment monitoring parameters of the lithium battery pack based on environment data of the environment where the lithium battery pack is located;
and the battery state evaluation module is used for performing state evaluation on the lithium battery pack.
2. The lithium battery pack monitoring system for monitoring long strings of serial connections of claim 1 wherein the battery management chip is MT9803, the MT9803 is a data acquisition IC capable of measuring voltages of up to 12 series connected batteries, an input multiplexer connects the batteries into a 12-bit delta-sigma analog-to-digital converter ADC with an internal 8ppm/°c voltage reference combined with the ADC;
the MT9803 has three modes of operation: hardware shutdown, standby and measurement, the hardware shutdown is a true zero power mode, the standby mode is a power saving state, in the measurement mode, MT9803 is used to measure battery voltage and save the measurement results in memory, and in addition, the measurement mode will monitor over-voltage and under-voltage conditions of each battery.
3. A lithium battery pack monitoring system for monitoring long strings according to claim 2, wherein the hardware shutdown mode can disconnect the v+ pin from the C pin and the lithium battery pack, if the v+ power pin is 0V, the MT9803 will typically sink less than 1nA of current from the battery, when all circuits inside the IC are turned off; when v+=0v, communication with the IC is not possible.
4. A lithium battery pack monitoring system for monitoring long strings according to claim 2, characterized in that the standby mode is an operating state with the lowest supply current when connected to the power supply, when v+=44v, the standby current is typically 12 μa, with all circuits except the serial interface and the voltage regulator being turned off, all SPI logic inputs should be set to logic 1 level in order to achieve as low standby current consumption as possible, MT9803 can be programmed to standby mode by setting the comparator duty cycle configuration bits CDC [2:0] to 0; if the device is placed in standby mode while the ADC measurements are in progress, the measurements will be interrupted and the battery voltage register will be in an indeterminate state, if the standby mode is to be exited, a non-zero value must be written to the CDC bit.
5. A lithium battery pack monitoring system for monitoring long strings according to claim 2, wherein the measurement mode, when CDC bit is set to a value of 1 to 7, MT9803 is in measurement mode, when cdc=1, MT9803 is in on state and waits for an activate ADC conversion command; when the CDC bit has a value of 2 to 7, the IC will monitor each battery voltage and generate an interrupt signal on the SDO pin indicating that all battery voltages are within the limits of UV and OV, the value of the CDC bit determining the frequency of battery monitoring and the average power supply current consumption level;
the method for indicating the UV/OV interrupt status is level polling, which is described in the section "serial port", the UV/OV limit is set by the VUV and VOV values in the configuration registers, when a certain battery voltage exceeds the UV/OV limit, one bit in the flag register will be set, the UV and OV flag status of each battery can be determined using the read flag register set;
when the IC is in the measurement mode, it may be required to perform ADC measurements at any time, and if it is desired to initiate battery voltage measurements in the measurement mode, an initiate a/D conversion command is sent, after which the MT9803 will indicate the a/D converter status by level polling, and during execution of the battery voltage measurement command, the UV and OV flags are updated, and when the measurements are completed, the device will continue to monitor the UV and OV conditions at the frequency specified by the CDC bit.
6. The lithium battery pack monitoring system for monitoring long strings of serial connections according to claim 1, wherein the charging analysis process of the charging analysis module is specifically as follows:
step 1: the lithium battery is labeled u, u=1, 2,..z, z being a positive integer; acquiring the charging start time of the lithium battery, and recording the charging start time as CKTu;
step 2: acquiring charging current when the lithium battery is charged, and marking the charging current as CDLu; acquiring the battery capacity of the lithium battery, and marking the battery capacity as DRu;
step 3: calculating to obtain estimated charging time YTu of the lithium battery by combining a charging time calculation formula YTu = DRu/CDLu×60;
step 4: and adding the estimated charging time to the charging start time to obtain the charging end time CJTu of the lithium battery.
7. The lithium battery pack monitoring system for monitoring long-string serial connection according to claim 1, wherein the working process of the intelligent early-warning module is specifically as follows:
s1, acquiring the current time TD1 of a system and the charging end time of a plurality of lithium batteries;
if TD < CJTu, calculating the remaining charging duration SYTu of the lithium battery by using the formula sytu=cjtu-TD 1, generating a charging completion signal after the remaining charging duration SYTu of the lithium battery, and immediately feeding back the charging completion signal to the server;
if TD is more than or equal to CJTu, generating a charging completion signal and immediately feeding the charging completion signal back to a server, sending the charging completion signal to a user terminal by the server, recording the sending time of the charging completion signal, and recording the sending time as the signal sending time;
s2, if the user terminal checks the charging completion signal, feeding back a charging stopping signal, and controlling the lithium battery to stop charging after receiving the charging stopping signal by the server;
s3, if the user terminal does not check the charging completion signal, a short message reminding signal is generated after the time t1, and is immediately fed back to the server, the server sends the short message reminding signal to the user terminal after generating a short message, and if the user terminal checks the short message reminding signal, a charging stopping signal is fed back, and the server controls the lithium battery to stop charging after receiving the charging stopping signal;
s4, if the user terminal does not check the short message reminding signal, a forced power-off signal is generated after time t2 and fed back to the server, the server controls the lithium battery to stop charging after receiving the forced power-off signal, and meanwhile the times of the forced power-off signal generated by the lithium battery are recorded and recorded as forced power-off times QDu; wherein t1 > t2.
8. The system for monitoring a long string of serially connected lithium battery packs according to claim 1, wherein the environmental monitoring parameter calculation module calculates environmental calculation parameters of the lithium battery packs using the formula:
wherein T represents the difference between the working temperature of the lithium battery pack and the ambient temperature, H represents the humidity value of the environment where the lithium battery pack is located, and D represents the air dust content value, beta, omega, in the environment where the lithium battery pack is located 4 、ω 5 、ω 6 Representing the corresponding scaling parameters, respectively.
9. The system for monitoring the lithium battery pack connected in series according to claim 1, wherein the battery state evaluation module performs state evaluation on the abnormal battery by combining an attenuation rate obtained by estimating the abnormal battery by the battery attenuation estimating unit, the appearance monitoring parameter of the abnormal battery calculated by the appearance monitoring parameter calculating module, and the environment monitoring parameter of the lithium battery pack calculated by the environment monitoring parameter calculating module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117154872A (en) * | 2023-08-01 | 2023-12-01 | 南京汤峰机电有限公司 | Lithium battery charging control method and system |
| CN117269785A (en) * | 2023-11-23 | 2023-12-22 | 广东省锐驰新能源科技有限公司 | Multi-mode test supervision system of lithium battery pack based on data analysis |
| CN117420452A (en) * | 2023-12-18 | 2024-01-19 | 深圳市海雷新能源有限公司 | Monitoring and early warning system for lithium battery energy storage |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117154872A (en) * | 2023-08-01 | 2023-12-01 | 南京汤峰机电有限公司 | Lithium battery charging control method and system |
| CN117154872B (en) * | 2023-08-01 | 2023-12-29 | 南京汤峰机电有限公司 | Lithium battery charging control method and system |
| CN117269785A (en) * | 2023-11-23 | 2023-12-22 | 广东省锐驰新能源科技有限公司 | Multi-mode test supervision system of lithium battery pack based on data analysis |
| CN117269785B (en) * | 2023-11-23 | 2024-04-02 | 广东省锐驰新能源科技有限公司 | Multi-mode test supervision system of lithium battery pack based on data analysis |
| CN117420452A (en) * | 2023-12-18 | 2024-01-19 | 深圳市海雷新能源有限公司 | Monitoring and early warning system for lithium battery energy storage |
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