CN110837050B - Battery pack differential pressure fault judgment method and device and storage medium - Google Patents
Battery pack differential pressure fault judgment method and device and storage medium Download PDFInfo
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- CN110837050B CN110837050B CN201911191305.4A CN201911191305A CN110837050B CN 110837050 B CN110837050 B CN 110837050B CN 201911191305 A CN201911191305 A CN 201911191305A CN 110837050 B CN110837050 B CN 110837050B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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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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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention discloses a method, equipment and a storage medium for judging a voltage difference fault of a battery pack, wherein the current working state, current parameters and voltage parameters of the battery pack to be detected are obtained; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, and the efficiency of differential pressure fault judgment of the battery is improved.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a method, equipment and a storage medium for judging a battery pack differential pressure fault.
Background
At present, in pure electric vehicles on the market, most of the voltage difference diagnosis between the battery cells of the battery pack is only a single fault threshold, and when the voltage difference diagnosis exceeds the threshold, a fault is reported, but the actual medium voltage difference fault has a lot of influence of environment-related factors; for example, the judgment of the differential pressure fault is influenced by the different use states of the battery, the temperature and the SOC are considered, and the differential pressure fault values and the like at different temperatures are obtained.
Disclosure of Invention
The invention mainly aims to provide a method, equipment and a storage medium for judging a differential pressure fault of a battery pack, and aims to solve the problems that the battery differential pressure fault is judged in a single mode and the influence of environmental factors on differential pressure fault judgment is not considered in the prior art.
In order to achieve the above object, the present invention provides a method for determining a differential pressure fault of a battery pack, including the steps of:
acquiring the current working state, current parameters and voltage parameters of a battery pack to be detected;
and judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter.
Preferably, the determining the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter includes:
when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first pressure difference between batteries, and judging a pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference;
and when the current working state is a standing state, acquiring the voltage parameter of the battery pack to be detected and a second pressure difference between the batteries, and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter and the second pressure difference.
Preferably, when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first voltage difference between the batteries, and determining a voltage difference fault of the battery pack to be detected according to the current parameter and the first voltage difference, includes:
when the current working state is a charging or discharging state, acquiring the charging and discharging current of the battery pack to be detected, a first pressure difference between the batteries, a first temperature difference between the highest temperature and the lowest temperature of the batteries and a first duration time;
and judging the pressure difference fault of the battery pack to be detected according to the charge and discharge current, the first pressure difference, the first temperature difference and the first duration.
Preferably, the determining the differential pressure fault of the battery pack to be detected according to the charge-discharge current, the first differential pressure, the first temperature difference and the first duration time includes:
comparing the charge-discharge current with a preset discharge capacity to obtain a first comparison result;
comparing the first pressure difference with a preset first pressure difference threshold value to obtain a second comparison result;
comparing the first temperature difference with a preset first temperature difference threshold value to obtain a third comparison result;
comparing the first duration with a preset first time threshold to obtain a fourth comparison result;
and judging the pressure difference fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result.
Preferably, the determining the differential pressure fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result includes:
when the first comparison result is that the charging and discharging current is not larger than the preset discharging capacity, the second comparison result is that the first pressure difference is larger than the preset pressure difference threshold value, the third comparison result is that the first temperature difference is not larger than the preset first temperature difference threshold value, and the first duration time is not smaller than a preset first time threshold value, determining that the pressure difference fault of the battery pack to be detected is caused;
and when the first comparison result indicates that the charging and discharging current is greater than the preset discharging capacity, the second comparison result indicates that the first pressure difference is greater than the preset pressure difference threshold, the third comparison result indicates that the first temperature difference is not greater than the preset first temperature difference threshold, and the fourth comparison result indicates that the first duration time is not less than the preset first time threshold, determining that the battery pack to be detected has a pressure difference fault.
Preferably, before the determining the differential pressure fault of the battery pack to be detected according to the charging and discharging current, the first differential pressure, the first temperature difference and the first duration, the method for determining the differential pressure fault of the battery pack further includes:
acquiring a state of charge value, a first maximum voltage value and a first minimum voltage value of the battery pack to be detected;
when the state of charge value is smaller than a preset charge threshold value, performing no differential pressure fault treatment on the battery pack to be detected;
when the first maximum voltage value is not greater than a preset first voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, performing no differential pressure fault processing on the battery pack to be detected.
Preferably, when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected and a second voltage difference between the batteries, and determining a voltage difference fault of the battery pack to be detected according to the voltage parameter and the second voltage difference, including:
when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected, a second pressure difference among the batteries, a second temperature difference between the highest temperature and the lowest temperature of each battery and a second duration time;
and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter, the second pressure difference, the second temperature difference and the second duration.
Preferably, the determining the differential pressure fault of the battery pack to be detected according to the voltage parameter, the second differential pressure, the second differential temperature and the second duration time includes:
acquiring a second minimum voltage value from the voltage parameter;
when the second temperature difference is smaller than a preset second temperature difference threshold value and the second minimum voltage value is not smaller than a preset second voltage value, starting judgment on the pressure difference fault of the detection battery pack;
obtaining a second maximum voltage value of the battery pack to be detected after standing and after being electrified for the first time;
when the second maximum voltage value is larger than a preset third voltage value and the second minimum voltage value is not larger than a preset fourth voltage value, judging that the battery pack to be detected has a fault of overlarge voltage difference;
when the second maximum voltage value belongs to a preset voltage range, the second voltage difference is greater than a preset second voltage difference threshold value, and the second duration time is not less than a preset second time threshold value, determining that the battery pack to be detected has an excessive voltage difference fault;
when the second maximum voltage value is not greater than a preset fourth voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, performing no differential pressure fault treatment on the battery pack to be detected.
In addition, in order to achieve the above object, the present invention also provides a battery pack differential pressure failure determination device, including: the battery pack differential pressure fault determination method comprises a memory, a processor and a battery pack differential pressure fault determination program stored on the memory and operable on the processor, the battery pack differential pressure fault determination program being configured to implement the steps of the battery pack differential pressure fault determination method as described above.
In addition, in order to achieve the above object, the present invention further provides a storage medium having a battery pack differential pressure failure determination program stored thereon, wherein the battery pack differential pressure failure determination program, when executed by a processor, implements the steps of the battery pack differential pressure failure determination method as described above.
According to the method for judging the voltage difference fault of the battery pack, the current working state, the current parameter and the voltage parameter of the battery pack to be detected are obtained; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, and the efficiency of differential pressure fault judgment of the battery is improved.
Drawings
Fig. 1 is a schematic structural diagram of a battery pack differential pressure fault determination device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for determining differential pressure failure of a battery pack according to a first embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for determining a differential pressure fault of a battery pack according to a second embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The solution of the embodiment of the invention is mainly as follows: the method comprises the steps of obtaining the current working state, the current parameter and the voltage parameter of the battery pack to be detected; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, the efficiency of differential pressure fault judgment of the battery is improved, and the technical problems that the judgment mode of the differential pressure fault of the battery in the prior art is single and the influence of environmental factors on the differential pressure fault judgment is not considered are solved.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack differential pressure fault determination device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the differential pressure failure determination device for a battery pack may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory or a Non-volatile Memory (NVM), such as a disk Memory. The memory 1005 may optionally be a separate memory from the processor 1001 described above.
It will be understood by those skilled in the art that the configuration of the differential pressure failure determination device of the battery pack shown in fig. 1 does not constitute a limitation of the differential pressure failure determination device of the battery pack, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, the memory 1005 as a storage medium may include an operating system, a network communication module, a client interface module, and a differential pressure failure determination program.
The battery pack differential pressure failure determination device of the present invention calls, by the processor 1001, the battery pack differential pressure failure determination program stored in the memory 1005, and performs the following operations:
acquiring the current working state, current parameters and voltage parameters of a battery pack to be detected;
and judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first pressure difference between batteries, and judging a pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference;
and when the current working state is a standing state, acquiring the voltage parameter of the battery pack to be detected and a second pressure difference between the batteries, and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter and the second pressure difference.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
when the current working state is a charging or discharging state, acquiring the charging and discharging current of the battery pack to be detected, a first pressure difference between the batteries, a first temperature difference between the highest temperature and the lowest temperature of the batteries and a first duration time;
and judging the pressure difference fault of the battery pack to be detected according to the charge and discharge current, the first pressure difference, the first temperature difference and the first duration.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
comparing the charge-discharge current with a preset discharge capacity to obtain a first comparison result;
comparing the first pressure difference with a preset first pressure difference threshold value to obtain a second comparison result;
comparing the first temperature difference with a preset first temperature difference threshold value to obtain a third comparison result;
comparing the first duration with a preset first time threshold to obtain a fourth comparison result;
and judging the pressure difference fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
when the first comparison result is that the charging and discharging current is not larger than the preset discharging capacity, the second comparison result is that the first pressure difference is larger than the preset pressure difference threshold value, the third comparison result is that the first temperature difference is not larger than the preset first temperature difference threshold value, and the first duration time is not smaller than a preset first time threshold value, determining that the pressure difference fault of the battery pack to be detected is caused;
and when the first comparison result indicates that the charging and discharging current is greater than the preset discharging capacity, the second comparison result indicates that the first pressure difference is greater than the preset pressure difference threshold, the third comparison result indicates that the first temperature difference is not greater than the preset first temperature difference threshold, and the fourth comparison result indicates that the first duration time is not less than the preset first time threshold, determining that the battery pack to be detected has a pressure difference fault.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
acquiring a state of charge value, a first maximum voltage value and a first minimum voltage value of the battery pack to be detected;
when the state of charge value is smaller than a preset charge threshold value, performing no differential pressure fault treatment on the battery pack to be detected;
when the first maximum voltage value is not greater than a preset first voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, performing no differential pressure fault processing on the battery pack to be detected.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected, a second pressure difference among the batteries, a second temperature difference between the highest temperature and the lowest temperature of each battery and a second duration time;
and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter, the second pressure difference, the second temperature difference and the second duration.
Further, the processor 1001 may call the battery pack differential pressure failure determination program stored in the memory 1005, and further perform the following operations:
acquiring a second minimum voltage value from the voltage parameter;
when the second temperature difference is smaller than a preset second temperature difference threshold value and the second minimum voltage value is not smaller than a preset second voltage value, starting judgment on the pressure difference fault of the detection battery pack;
obtaining a second maximum voltage value of the battery pack to be detected after standing and after being electrified for the first time;
when the second maximum voltage value is larger than a preset third voltage value and the second minimum voltage value is not larger than a preset fourth voltage value, judging that the battery pack to be detected has a fault of overlarge voltage difference;
when the second maximum voltage value belongs to a preset voltage range, the second voltage difference is greater than a preset second voltage difference threshold value, and the second duration time is not less than a preset second time threshold value, determining that the battery pack to be detected has an excessive voltage difference fault;
when the second maximum voltage value is not greater than a preset fourth voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, performing no differential pressure fault treatment on the battery pack to be detected.
According to the scheme, the current working state, the current parameter and the voltage parameter of the battery pack to be detected are obtained; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, and the efficiency of differential pressure fault judgment of the battery is improved.
Based on the hardware structure, the embodiment of the method for judging the voltage difference fault of the battery pack is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for determining a differential pressure fault of a battery pack according to a first embodiment of the present invention.
In a first embodiment, the method for determining a differential pressure fault of a battery pack includes the following steps:
and step S10, acquiring the current working state, current parameters and voltage parameters of the battery pack to be detected.
It should be noted that the battery pack to be detected is a battery pack that needs to be subjected to differential pressure fault judgment and detection, the current working state indicates the current working state of the battery pack to be detected, and the current parameter and the voltage parameter reflect parameters of a current value and a voltage value of the battery pack to be detected.
And step S20, judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter.
It can be understood that the voltage difference fault of the battery pack to be detected can be determined through the analysis of the current working state, the current parameter and the voltage parameter.
According to the scheme, the current working state, the current parameter and the voltage parameter of the battery pack to be detected are obtained; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, and the efficiency of differential pressure fault judgment of the battery is improved.
Further, fig. 3 is a schematic flow chart of a method for determining a differential pressure fault of a battery pack according to a second embodiment of the present invention, and as shown in fig. 3, the method for determining a differential pressure fault of a battery pack according to the second embodiment of the present invention is provided based on the first embodiment, and in this embodiment, the step S20 specifically includes the following steps:
and S21, when the current working state is a charging or discharging state, acquiring the current parameter of the battery pack to be detected and a first pressure difference between the batteries, and judging the pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference.
And S22, when the current working state is a standing state, acquiring the voltage parameter of the battery pack to be detected and a second pressure difference between the batteries, and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter and the second pressure difference.
It should be understood that when the current working state is a charging or discharging state, the differential pressure fault of the battery pack to be detected can be judged through the current parameter and the first differential pressure, and when the current working state is a standing state, the differential pressure fault of the battery pack to be detected can be judged according to the voltage parameter and the second differential pressure.
Further, the step S21 includes the following steps:
when the current working state is a charging or discharging state, acquiring the charging and discharging current of the battery pack to be detected, a first pressure difference between the batteries, a first temperature difference between the highest temperature and the lowest temperature of the batteries and a first duration time;
and judging the pressure difference fault of the battery pack to be detected according to the charge and discharge current, the first pressure difference, the first temperature difference and the first duration.
It can be understood that whether the battery pack to be detected has a differential pressure fault can be judged by analyzing the charging and discharging current of the battery pack to be detected, the first differential pressure, the first temperature difference and the first duration, so that the accuracy of differential pressure fault judgment can be further improved, and the error judgment of the differential pressure fault can be avoided.
Further, the step of judging the pressure difference fault of the battery pack to be detected according to the charge-discharge current, the first pressure difference, the first temperature difference and the first duration time comprises the following steps of:
comparing the charge-discharge current with a preset discharge capacity to obtain a first comparison result;
comparing the first pressure difference with a preset first pressure difference threshold value to obtain a second comparison result;
comparing the first temperature difference with a preset first temperature difference threshold value to obtain a third comparison result;
comparing the first duration with a preset first time threshold to obtain a fourth comparison result;
and judging the pressure difference fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result.
It should be understood that the charging and discharging current, the first pressure difference, the first temperature difference and the first duration are respectively compared with corresponding preset threshold values, and the pressure difference fault of the battery pack to be detected can be accurately judged according to respective comparison results and combined analysis, so that the accuracy of the pressure difference fault is further improved.
Further, the step of judging the differential pressure fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result includes the following steps:
when the first comparison result is that the charging and discharging current is not larger than the preset discharging capacity, the second comparison result is that the first pressure difference is larger than the preset pressure difference threshold value, the third comparison result is that the first temperature difference is not larger than the preset first temperature difference threshold value, and the first duration time is not smaller than a preset first time threshold value, determining that the pressure difference fault of the battery pack to be detected is caused;
and when the first comparison result indicates that the charging and discharging current is greater than the preset discharging capacity, the second comparison result indicates that the first pressure difference is greater than the preset pressure difference threshold, the third comparison result indicates that the first temperature difference is not greater than the preset first temperature difference threshold, and the fourth comparison result indicates that the first duration time is not less than the preset first time threshold, determining that the battery pack to be detected has a pressure difference fault.
In a specific implementation, the preset discharge capacity may be set to 0.5C, the preset differential pressure threshold may be set to 2.1V, the preset first temperature difference threshold may be set to 3 ℃, the first time threshold may be set to 1S, the setting of the parameters may also be set to other values, for example, the preset first temperature difference threshold is set to a sum of two times of an actually used current and 110mV, so that a differential pressure fault may be determined in real time, which is not limited in this embodiment; when the charging and discharging current is less than or equal to 0.5C, the first temperature difference is less than or equal to 3 ℃, the first duration is greater than or equal to 1S, and the first pressure difference is greater than 2.1V, the pressure difference fault of the battery pack to be detected is judged; in actual operation, the preset discharge capacity is limited, so that the influence factors of pressure difference caused by temperature difference can be eliminated, and the preset first temperature difference threshold value is limited, so that the measurement stability of the battery pack is determined as a pressure difference fault instead of false alarm.
Further, before the differential pressure fault of the battery pack to be detected is judged according to the charge and discharge current, the first differential pressure, the first temperature difference and the first duration, the differential pressure fault judgment method of the battery pack further comprises the following steps:
acquiring a state of charge value, a first maximum voltage value and a first minimum voltage value of the battery pack to be detected;
when the state of charge value is smaller than a preset charge threshold value, performing no differential pressure fault treatment on the battery pack to be detected;
when the first maximum voltage value is not greater than a preset first voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, performing no differential pressure fault processing on the battery pack to be detected.
It can be understood that three situations that no differential pressure fault is caused can be determined by obtaining the state of charge value, the maximum voltage value and the minimum voltage value, that is, when the state of charge value is smaller than a preset charge threshold value, and the first maximum voltage value is not larger than a preset first voltage value, or when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, no differential pressure fault processing is performed on the battery pack to be detected; the preset charge threshold may be set to 10%, the preset first voltage value may be determined to be 3.15V, and the preset charge threshold and the preset first voltage value may be set to other values, which is not limited in this embodiment; taking lithium iron phosphate as an example, because the pressure difference of the lithium iron phosphate at the low-end discharge end is increased rapidly, which is the characteristic of the lithium iron phosphate battery, and the inconsistency of monomer battery cores in a battery system and the low-end charge state are considered, a customer is advised to charge as soon as possible, so that the pressure difference fault judgment is not carried out, otherwise, the pressure difference fault is reported frequently, and the use experience of the customer is influenced; and the misjudgment of the pressure difference fault caused by the loosening fault of the acquisition line can be eliminated by checking the condition of the adjacent batteries.
Further, the step S22 includes the following steps:
when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected, a second pressure difference among the batteries, a second temperature difference between the highest temperature and the lowest temperature of each battery and a second duration time;
and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter, the second pressure difference, the second temperature difference and the second duration.
It can be understood that when the current working state is the standing state, the voltage difference fault of the battery pack to be detected can be judged through the voltage parameter, the second voltage difference, the second temperature difference and the second duration, and then comprehensive judgment is performed according to the multidimensional environmental factors and the parameters corresponding to the current working state.
Further, the step of judging the voltage difference fault of the battery pack to be detected according to the voltage parameter, the second voltage difference, the second temperature difference and the second duration time comprises the following steps of:
acquiring a second minimum voltage value from the voltage parameter;
when the second temperature difference is smaller than a preset second temperature difference threshold value and the second minimum voltage value is not smaller than a preset second voltage value, starting judgment on the pressure difference fault of the detection battery pack;
obtaining a second maximum voltage value of the battery pack to be detected after standing and after being electrified for the first time;
when the second maximum voltage value is larger than a preset third voltage value and the second minimum voltage value is not larger than a preset fourth voltage value, judging that the battery pack to be detected has a fault of overlarge voltage difference;
when the second maximum voltage value belongs to a preset voltage range, the second voltage difference is greater than a preset second voltage difference threshold value, and the second duration time is not less than a preset second time threshold value, determining that the battery pack to be detected has an excessive voltage difference fault;
when the second maximum voltage value is not greater than a preset fourth voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, performing no differential pressure fault treatment on the battery pack to be detected.
It should be understood that the preset second temperature difference threshold may be set to 3 ℃, the preset third voltage value may be set to 500mV, and the preset second temperature difference threshold and the preset third voltage value may be set to other values, which is not limited in this embodiment; the second maximum voltage value may be set to 3.4V, the second minimum voltage value may be set to 3.32V, when the second maximum voltage value is greater than a preset third voltage value and the second minimum voltage value is not greater than a preset fourth voltage value, it is determined that the battery pack to be detected has an excessive voltage difference fault, and the second maximum voltage value and the second minimum voltage value may be set to other values, which is not limited in this embodiment.
In a specific implementation, the preset voltage range may be set to (3.25V, 3.35V), and certainly may be set to other voltage ranges, which is not limited in this embodiment, the preset fourth voltage value may be set to 100mV and 300mV, or may be set to other values, which is not limited in this embodiment, when the second maximum voltage value is not greater than the preset fourth voltage value, the battery pack to be detected is not subjected to differential pressure fault processing, when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, the battery pack to be detected is not subjected to differential pressure fault processing, the large static differential pressure fault criterion is that a differential pressure fault is determined according to a voltage range in which the maximum voltage value in the battery pack is located after power-on, where lithium iron phosphate is taken as an example, and the voltage range in which the maximum voltage value in the battery pack is located, different pressure difference standards are set to be characteristics of the lithium iron phosphate battery, at the high end and the middle end of a charge state, the consistency of single battery cells in the battery system is high, and the standard of pressure difference control is higher than that of the charge state end.
According to the scheme, when the current working state is the charging or discharging state, the current parameter of the battery pack to be detected and the first pressure difference between the batteries are obtained, the pressure difference fault of the battery pack to be detected is judged according to the current parameter and the first pressure difference, when the current working state is the standing state, the voltage parameter of the battery pack to be detected and the second pressure difference between the batteries are obtained, the pressure difference fault of the battery pack to be detected is judged according to the voltage parameter and the second pressure difference, the pressure difference faults of the battery packs in different states can be judged, and further the comprehensiveness and accuracy of the pressure difference fault judgment are improved.
In addition, an embodiment of the present invention further provides a storage medium, where a battery pack differential pressure fault determining program is stored on the storage medium, and when executed by a processor, the battery pack differential pressure fault determining program implements the following operations:
acquiring the current working state, current parameters and voltage parameters of a battery pack to be detected;
and judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first pressure difference between batteries, and judging a pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference;
and when the current working state is a standing state, acquiring the voltage parameter of the battery pack to be detected and a second pressure difference between the batteries, and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter and the second pressure difference.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
when the current working state is a charging or discharging state, acquiring the charging and discharging current of the battery pack to be detected, a first pressure difference between the batteries, a first temperature difference between the highest temperature and the lowest temperature of the batteries and a first duration time;
and judging the pressure difference fault of the battery pack to be detected according to the charge and discharge current, the first pressure difference, the first temperature difference and the first duration.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
comparing the charge-discharge current with a preset discharge capacity to obtain a first comparison result;
comparing the first pressure difference with a preset first pressure difference threshold value to obtain a second comparison result;
comparing the first temperature difference with a preset first temperature difference threshold value to obtain a third comparison result;
comparing the first duration with a preset first time threshold to obtain a fourth comparison result;
and judging the pressure difference fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
when the first comparison result is that the charging and discharging current is not larger than the preset discharging capacity, the second comparison result is that the first pressure difference is larger than the preset pressure difference threshold value, the third comparison result is that the first temperature difference is not larger than the preset first temperature difference threshold value, and the first duration time is not smaller than a preset first time threshold value, determining that the pressure difference fault of the battery pack to be detected is caused;
and when the first comparison result indicates that the charging and discharging current is greater than the preset discharging capacity, the second comparison result indicates that the first pressure difference is greater than the preset pressure difference threshold, the third comparison result indicates that the first temperature difference is not greater than the preset first temperature difference threshold, and the fourth comparison result indicates that the first duration time is not less than the preset first time threshold, determining that the battery pack to be detected has a pressure difference fault.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
acquiring a state of charge value, a first maximum voltage value and a first minimum voltage value of the battery pack to be detected;
when the state of charge value is smaller than a preset charge threshold value, performing no differential pressure fault treatment on the battery pack to be detected;
when the first maximum voltage value is not greater than a preset first voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, performing no differential pressure fault processing on the battery pack to be detected.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected, a second pressure difference among the batteries, a second temperature difference between the highest temperature and the lowest temperature of each battery and a second duration time;
and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter, the second pressure difference, the second temperature difference and the second duration.
Further, when executed by the processor, the battery pack differential pressure fault determination program further implements the following operations:
acquiring a second minimum voltage value from the voltage parameter;
when the second temperature difference is smaller than a preset second temperature difference threshold value and the second minimum voltage value is not smaller than a preset second voltage value, starting judgment on the pressure difference fault of the detection battery pack;
obtaining a second maximum voltage value of the battery pack to be detected after standing and after being electrified for the first time;
when the second maximum voltage value is larger than a preset third voltage value and the second minimum voltage value is not larger than a preset fourth voltage value, judging that the battery pack to be detected has a fault of overlarge voltage difference;
when the second maximum voltage value belongs to a preset voltage range, the second voltage difference is greater than a preset second voltage difference threshold value, and the second duration time is not less than a preset second time threshold value, determining that the battery pack to be detected has an excessive voltage difference fault;
when the second maximum voltage value is not greater than a preset fourth voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, performing no differential pressure fault treatment on the battery pack to be detected.
According to the scheme, the current working state, the current parameter and the voltage parameter of the battery pack to be detected are obtained; the differential pressure fault of the battery pack to be detected is judged according to the current working state, the current parameter and the voltage parameter, the precision of differential pressure fault judgment can be improved, the accuracy and the stability of differential pressure fault judgment can be improved by combining the comprehensive judgment of the current working state, the current parameter and the voltage parameter, the differential pressure fault state of the battery pack to be detected can be determined in real time due to the dynamic change of the current and the voltage, and the efficiency of differential pressure fault judgment of the battery is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or other apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or other apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or article that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A method for judging a differential pressure fault of a battery pack is characterized by comprising the following steps:
acquiring the current working state, current parameters and voltage parameters of a battery pack to be detected;
judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter;
wherein, the judging the voltage difference fault of the battery pack to be detected according to the current working state, the current parameter and the voltage parameter comprises the following steps:
when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first pressure difference between batteries, and judging a pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference;
when the current working state is a standing state, acquiring voltage parameters of the battery pack to be detected and second voltage differences among the batteries, and judging the voltage difference faults of the battery pack to be detected according to the voltage parameters and the second voltage differences;
when the current working state is a charging or discharging state, acquiring a current parameter of the battery pack to be detected and a first pressure difference between batteries, and judging a pressure difference fault of the battery pack to be detected according to the current parameter and the first pressure difference, wherein the method comprises the following steps:
when the current working state is a charging or discharging state, acquiring the charging and discharging current of the battery pack to be detected, a first pressure difference between the batteries, a first temperature difference between the highest temperature and the lowest temperature of the batteries and a first duration time;
and judging the pressure difference fault of the battery pack to be detected according to the charge and discharge current, the first pressure difference, the first temperature difference and the first duration.
2. The method for judging the differential pressure fault of the battery pack according to claim 1, wherein the step of judging the differential pressure fault of the battery pack to be detected according to the charge-discharge current, the first differential pressure, the first temperature difference and the first duration comprises the steps of:
comparing the charge-discharge current with a preset discharge capacity to obtain a first comparison result;
comparing the first pressure difference with a preset first pressure difference threshold value to obtain a second comparison result;
comparing the first temperature difference with a preset first temperature difference threshold value to obtain a third comparison result;
comparing the first duration with a preset first time threshold to obtain a fourth comparison result;
and judging the pressure difference fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result.
3. The method for determining the differential pressure fault of the battery pack according to claim 2, wherein the determining the differential pressure fault of the battery pack to be detected according to the first comparison result, the second comparison result, the third comparison result and the fourth comparison result comprises:
when the first comparison result is that the charging and discharging current is not larger than the preset discharging capacity, the second comparison result is that the first pressure difference is larger than the preset pressure difference threshold value, the third comparison result is that the first temperature difference is not larger than the preset first temperature difference threshold value, and the first duration time is not smaller than a preset first time threshold value, determining that the pressure difference fault of the battery pack to be detected is caused;
and when the first comparison result indicates that the charging and discharging current is greater than the preset discharging capacity, the second comparison result indicates that the first pressure difference is greater than the preset pressure difference threshold, the third comparison result indicates that the first temperature difference is not greater than the preset first temperature difference threshold, and the fourth comparison result indicates that the first duration time is not less than the preset first time threshold, determining that the battery pack to be detected has a pressure difference fault.
4. The method for determining the differential pressure fault of the battery pack according to any one of claims 1 to 3, wherein before determining the differential pressure fault of the battery pack to be detected according to the charging and discharging current, the first differential pressure, the first temperature difference and the first duration, the method for determining the differential pressure fault of the battery pack further comprises:
acquiring a state of charge value, a first maximum voltage value and a first minimum voltage value of the battery pack to be detected;
when the state of charge value is smaller than a preset charge threshold value, performing no differential pressure fault treatment on the battery pack to be detected;
when the first maximum voltage value is not greater than a preset first voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the first maximum voltage value and the battery corresponding to the first minimum voltage value are adjacent batteries, performing no differential pressure fault processing on the battery pack to be detected.
5. The method for determining a differential pressure fault of a battery pack according to claim 1, wherein when the current working state is a static state, acquiring a voltage parameter of the battery pack to be detected and a second differential pressure between batteries, and determining the differential pressure fault of the battery pack to be detected according to the voltage parameter and the second differential pressure comprises:
when the current working state is a standing state, acquiring a voltage parameter of the battery pack to be detected, a second pressure difference among the batteries, a second temperature difference between the highest temperature and the lowest temperature of each battery and a second duration time;
and judging the pressure difference fault of the battery pack to be detected according to the voltage parameter, the second pressure difference, the second temperature difference and the second duration.
6. The method for determining the differential pressure fault of the battery pack according to claim 5, wherein the determining the differential pressure fault of the battery pack to be detected according to the voltage parameter, the second differential pressure, the second temperature difference and the second duration comprises:
acquiring a second minimum voltage value from the voltage parameter;
when the second temperature difference is smaller than a preset second temperature difference threshold value and the second minimum voltage value is not smaller than a preset second voltage value, starting judgment on the pressure difference fault of the detection battery pack;
obtaining a second maximum voltage value of the battery pack to be detected after standing and after being electrified for the first time;
when the second maximum voltage value is larger than a preset third voltage value and the second minimum voltage value is not larger than a preset fourth voltage value, judging that the battery pack to be detected has a fault of overlarge voltage difference;
when the second maximum voltage value belongs to a preset voltage range, the second voltage difference is greater than a preset second voltage difference threshold value, and the second duration time is not less than a preset second time threshold value, determining that the battery pack to be detected has an excessive voltage difference fault;
when the second maximum voltage value is not greater than a preset fourth voltage value, performing no differential pressure fault treatment on the battery pack to be detected;
and when the battery corresponding to the second maximum voltage value and the battery corresponding to the second minimum voltage value are adjacent batteries, performing no differential pressure fault treatment on the battery pack to be detected.
7. A battery pack differential pressure failure determination device, characterized by comprising: a memory, a processor, and a battery pack differential pressure fault determination program stored on the memory and executable on the processor, the battery pack differential pressure fault determination program configured to implement the steps of the battery pack differential pressure fault determination method according to any one of claims 1-6.
8. A storage medium having a battery pack differential pressure failure determination program stored thereon, the battery pack differential pressure failure determination program, when executed by a processor, implementing the steps of the battery pack differential pressure failure determination method according to any one of claims 1 to 6.
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| CN111679206B (en) * | 2020-06-01 | 2022-09-06 | Oppo（重庆）智能科技有限公司 | Electric quantity detection method and device, and storage medium |
| CN112540301B (en) * | 2020-11-27 | 2023-07-07 | 蜂巢能源科技股份有限公司 | Battery detection method, device and storage medium |
| CN113064081B (en) * | 2021-03-11 | 2023-12-05 | 北京车和家信息技术有限公司 | Power battery degradation detection method, device, medium, vehicle-mounted system and vehicle |
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