CN116540112A - Method for detecting battery consistency fault, battery manager, vehicle and medium - Google Patents

Method for detecting battery consistency fault, battery manager, vehicle and medium Download PDF

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Publication number
CN116540112A
CN116540112A CN202310558809.5A CN202310558809A CN116540112A CN 116540112 A CN116540112 A CN 116540112A CN 202310558809 A CN202310558809 A CN 202310558809A CN 116540112 A CN116540112 A CN 116540112A
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China
Prior art keywords
battery
value
voltage
temperature
vehicle
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CN202310558809.5A
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Chinese (zh)
Inventor
宋晓强
熊演峰
徐金龙
朱咏光
王丹丹
吴雪林
孙宁
郑国微
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Beijing Foton Daimler Automobile Co Ltd
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Beijing Foton Daimler Automobile Co Ltd
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Priority to CN202310558809.5A priority Critical patent/CN116540112A/en
Publication of CN116540112A publication Critical patent/CN116540112A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
    • 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]
    • 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]
    • G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
    • 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]
    • G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
    • 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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • 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]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • 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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses a method for detecting battery consistency faults, a battery manager, a vehicle and a medium, wherein the method for detecting the battery consistency faults comprises the following steps: detecting a single voltage value of each single battery and a single temperature value of each single battery; obtaining the maximum voltage value and the minimum voltage value in the single voltage values of all the single batteries, and obtaining the maximum temperature value and the minimum temperature value in the single temperature values of all the single batteries; obtaining a voltage difference value according to the maximum voltage value and the minimum voltage value, and obtaining a temperature difference value according to the maximum temperature value and the minimum temperature value; and if the voltage difference value is larger than the set voltage threshold value and the temperature difference value is smaller than the set temperature threshold value, a battery consistency fault alarm is triggered, so that a driver can be reminded of carrying out balanced maintenance in time, consistency and reliability of a battery system are ensured, the service life of a battery is prolonged, and the endurance mileage and the use friendliness of a vehicle are improved.

Description

Method for detecting battery consistency fault, battery manager, vehicle and medium
Technical Field
The present invention relates to the field of vehicle technology, and more particularly, to a method for detecting a vehicle battery consistency failure, a battery manager, a vehicle, and a computer readable storage medium.
Background
Along with the rapid development of new energy automobiles, the battery is used as one of key components of the new energy automobiles, and the requirements on performance, safety, service life and the like of the battery are also higher and higher. Among them, the battery consistency problem is one of the key problems to be solved in the battery management field. The problem of battery consistency refers to that a battery system of a new energy automobile consists of hundreds or thousands of battery monomers, and due to the difference of internal resistances and self-discharge rates of battery cores and the difference of manufacturing processes, the consistency of the battery system is poor when the automobile is used for a long time or stopped for a long time, so that the available capacity and the driving range are reduced, and the use experience is affected.
At present, battery consistency detection of a battery management system can only monitor the voltage of a battery cell, cannot monitor the influence of other factors such as the temperature of the battery cell, and cannot comprehensively and accurately judge the condition of battery consistency, so that a driver cannot be timely reminded of balanced maintenance. The battery imbalance state for a long time can further reduce the consistency of the battery, so that the available capacity is reduced, and the reliability and the service life of a battery system are finally influenced, thereby influencing the endurance mileage and the use feeling of the new energy automobile.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a method for detecting a consistency failure of a battery of a vehicle, which can actively identify the consistency of the battery system, and when the failure occurs, actively alarm and prompt a driver to perform balanced maintenance in time, thereby ensuring the consistency and reliability of the battery system, prolonging the service life of the battery, and further improving the endurance mileage and the use friendliness of the vehicle.
A second object of the present invention is to propose a battery manager.
A third object of the present invention is to propose a vehicle.
A fourth object of the present invention is to propose a computer readable storage medium.
To achieve the above object, a method for detecting a vehicle battery consistency failure according to an embodiment of the first aspect of the present invention includes: detecting a single voltage value of each single battery and a single temperature value of each single battery; obtaining the maximum voltage value and the minimum voltage value in the single voltage values of all the single batteries, and obtaining the maximum temperature value and the minimum temperature value in the single temperature values of all the single batteries; obtaining a voltage difference value according to the maximum voltage value and the minimum voltage value, and obtaining a temperature difference value according to the maximum temperature value and the minimum temperature value; and if the voltage difference value is larger than the set voltage threshold value and the temperature difference value is smaller than the set temperature threshold value, triggering a battery consistency fault alarm.
According to the method for detecting the consistency faults of the vehicle battery, the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature are calculated by detecting the voltage and the temperature of each single battery in the vehicle battery system, and the voltage difference value and the temperature difference value are calculated according to the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature. By comparing the voltage difference with the set voltage threshold and comparing the temperature difference with the set temperature threshold, it is possible to accurately judge the consistency of the vehicle battery system. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle are improved.
In some embodiments, prior to obtaining a voltage difference from the maximum voltage value and the minimum voltage value, the method further comprises: detecting a current value of each single battery; if the current value is smaller than a first preset current value and the duration time of the current value smaller than the first preset current value reaches a first preset duration time, determining that the battery is currently in a static state; and if the current value is larger than a second preset current value, determining that the battery is currently in dynamic state, wherein the second preset current value is larger than the first preset current value.
In some embodiments, obtaining a voltage difference from the maximum voltage value and the minimum voltage value comprises: and when the battery is currently in a static state, obtaining a static pressure difference value according to the maximum voltage value and the minimum voltage value, or when the battery is currently in a dynamic state, obtaining a dynamic pressure difference value according to the maximum voltage value and the minimum voltage value.
In some embodiments, determining that the voltage difference is greater than a set voltage threshold and the temperature difference is less than a set temperature threshold triggers a battery consistency fault alert, comprising: when the battery is currently in a static state, the static pressure difference value is larger than or equal to a first pressure difference value, and the duration time reaches a second preset duration time, a battery consistency fault alarm is triggered, wherein the value range of the first pressure difference value is 0.08V-0.12V. And when the battery is currently in running or charging, the dynamic differential pressure value is larger than or equal to the second differential pressure value, and the duration time reaches a third preset duration time, triggering a battery consistency fault alarm.
In some embodiments, the set voltage threshold has a value ranging from 0.2V to 0.4V.
In some embodiments, the method further comprises: and responding to the battery consistency fault alarm, and controlling the lighting of the vehicle battery fault lamp, so that the vehicle battery consistency fault alarm can rapidly warn a driver that the battery consistency fault occurs, prompt the driver to take maintenance measures in time, effectively avoid more serious safety problems caused by the battery consistency problem and improve the safety and reliability of the vehicle.
In some embodiments, the method further comprises: detecting a vehicle running state; and if the vehicle is in a driving state, responding to the battery consistency fault alarm, and controlling the output power of the battery to be reduced to a set power value.
In some embodiments, after obtaining the maximum voltage value and the minimum voltage value of the cell voltage values of all the cells, the method further comprises: and identifying the positions of the maximum voltage value and the minimum voltage value, and recording or prompting. Thus, the positioning and maintenance can be more easily performed, and the reliability and the service life of the vehicle battery can be improved.
To achieve the above object, a battery manager according to an embodiment of a second aspect of the present invention includes: at least one processor; a memory communicatively coupled to the at least one processor; the memory stores a computer program executable by the at least one processor, which when executing the computer program implements the method for detecting a vehicle battery consistency failure described in the above embodiments.
According to the battery manager of the embodiment of the present invention, the processor implements the method for detecting the consistency fault of the vehicle battery according to the above embodiment by executing the computer program, and can accurately determine the consistency of the vehicle battery system by calculating the voltage difference between the maximum voltage and the minimum voltage of each cell voltage and the temperature difference between the maximum temperature and the minimum temperature, comparing the voltage difference with the set voltage threshold, and comparing the temperature difference with the set temperature threshold. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle are improved.
In order to achieve the above object, a vehicle according to an embodiment of a third aspect of the present invention includes: a battery pack including a plurality of unit cells; the battery manager of the above embodiment, wherein the battery manager is connected to the battery pack.
According to the vehicle of the embodiment of the invention, by adopting the battery manager described in the above embodiment, a plurality of single batteries in the battery pack can be monitored and managed. The battery manager calculates the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature in the battery pack by calculating the voltage and the temperature of the single battery by using a method for detecting the consistency fault of the vehicle battery, and calculates a voltage difference value and a temperature difference value according to the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature. By comparing the voltage difference and the temperature difference with the set threshold values, the consistency of the vehicle battery system can be accurately determined. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle are improved.
To achieve the above object, a computer-readable storage medium of a fourth aspect of the present invention has stored thereon a computer program which, when executed by a processor, implements the method of detecting a vehicle battery consistency failure described in the above embodiment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of a method of detecting a vehicle battery uniformity fault in accordance with an embodiment of the present invention;
FIG. 2 is a block diagram of a battery manager according to one embodiment of the invention;
FIG. 3 is a block diagram of a vehicle according to one embodiment of the invention.
Reference numerals:
a vehicle 1;
a battery manager 10; a battery pack 20;
a processor 11; a memory 12.
Detailed Description
Embodiments of the present invention will be described in detail below, by way of example with reference to the accompanying drawings.
A method of detecting a battery consistency fault according to an embodiment of the present invention is described below with reference to fig. 1.
FIG. 1 is a flowchart of a method of detecting a vehicle battery uniformity fault according to an embodiment of the present invention, as shown in FIG. 1, comprising at least the following steps S1-S4.
S1, detecting a single voltage value of each single battery and a single temperature value of each single battery.
In some embodiments, the voltage and temperature information of each cell may be monitored by sensors in the battery management system, such as voltage sensors and temperature sensors.
Specifically, each single battery is typically provided with a voltage sensor for monitoring the voltage of the battery in real time. The voltage sensors can convert the voltage of the single battery into an electric signal in real time and send the electric signal to a battery management system for processing and analysis. In addition, each cell is typically also equipped with a temperature sensor for monitoring the temperature of the cell. The temperature sensors can convert the temperature of the single batteries into electric signals in real time and send the electric signals to a battery management system for processing and analysis. During the running process of the vehicle, the battery management system can monitor the voltage and temperature change of the single battery in real time so as to ensure the stability and reliability of the battery system. Meanwhile, the battery management system can record and store historical data so as to analyze and check problems in the future.
S2, obtaining the maximum voltage value and the minimum voltage value in the cell voltage values of all the cells, and obtaining the maximum temperature value and the minimum temperature value in the cell temperature values of all the cells.
Specifically, after obtaining the voltage and temperature data of all the unit cells, the battery management system needs to perform data sorting, comparison, and then determine a maximum voltage value, a minimum voltage value, a maximum temperature value, and a minimum temperature value.
And S3, obtaining a voltage difference value according to the maximum voltage value and the minimum voltage value, and obtaining a temperature difference value according to the maximum temperature value and the minimum temperature value.
Specifically, by calculating the difference between the maximum voltage value and the minimum voltage value, a voltage difference can be obtained, and by calculating the difference between the maximum temperature value and the minimum temperature value, a temperature difference can be obtained. The voltage difference reflects the potential difference between the battery cells, namely the degree of voltage difference between different battery cells. The temperature difference reflects the degree of temperature difference between the battery cells. The magnitude of these two differences may reflect the degree of inconsistency between the cells.
And S4, if the voltage difference value is larger than the set voltage threshold value and the temperature difference value is smaller than the set temperature threshold value, triggering a battery consistency fault alarm.
Wherein the voltage threshold and the temperature threshold are typically set according to the performance and safety requirements of the battery. In general, the setting of these thresholds requires a combination of factors such as battery chemistry, battery type, battery capacity, charge and discharge current, operating environment temperature, and the like. In general, setting the threshold too high reduces battery performance, and setting too low may cause the battery to be overdischarged or overcharged, thereby shortening the life of the battery or causing safety problems. Therefore, strict testing and evaluation are required when setting the threshold value, ensuring that it can meet the performance and safety requirements of the battery.
Specifically, when the voltage difference between the battery cells exceeds a set voltage threshold and the temperature difference between the cells is less than the set temperature threshold, a battery consistency fault alert is triggered. This is because the inconsistency of the batteries may cause the charge and discharge states of some unit batteries to be different from those of other units, thereby causing an increase in voltage difference. If the voltage difference exceeds a set voltage threshold, the performance and lifetime of the battery may be affected.
The condition that the temperature difference is smaller than the set temperature threshold is to reduce the influence of temperature on the consistency of the battery, because the voltage difference between the cells in the battery pack may change due to temperature change due to the sensitivity of the internal resistance of the battery to temperature during actual use. Therefore, the influence of temperature needs to be considered in setting the condition of the battery consistency fault warning. If the temperature difference between the single batteries in the battery pack exceeds a set threshold, the voltage difference caused by the internal resistance difference between the single batteries is larger than the voltage difference caused by the battery capacity difference, so that false alarm of fault alarm can be caused. Therefore, to reduce the effect of temperature on battery uniformity, conditions are set where the temperature difference is less than a set temperature threshold to ensure that an alarm is triggered in the event of voltage imbalance and temperature relative equalization.
According to the method for detecting the consistency faults of the vehicle battery, the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature are calculated by detecting the voltage and the temperature of each single battery in the vehicle battery system, and the voltage difference value and the temperature difference value are calculated according to the maximum voltage, the minimum voltage, the maximum temperature and the minimum temperature. By comparing the voltage difference with the set voltage threshold and comparing the temperature difference with the set temperature threshold, it is possible to accurately judge the consistency of the vehicle battery system. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle are improved.
In some embodiments, it is first necessary to detect the current value of each unit cell by a current sensor before obtaining the voltage difference value according to the maximum voltage value and the minimum voltage value, so that it is possible to determine whether the battery is in a static state or a dynamic state. If the current value is smaller than the first preset current value and the duration of the current value smaller than the first preset current value reaches the first preset duration, the battery can be determined to be in a static state currently, that is, the battery does not have a large-amplitude charging and discharging process. If the current value is larger than the second preset current value, the current of the battery is determined to be in a dynamic state, namely the battery is being charged or discharged, and the current value is obviously changed. Wherein the second preset current value is greater than the first preset current value.
The specific value of the first preset current value needs to be determined according to a specific battery and an application scene. In general, the first preset current value may be a maximum static current value of the battery under normal operation, that is, a current value of the battery in a non-charge and discharge state. The second preset current value may be a minimum dynamic current value of the battery under normal operation, that is, a current value of the battery under a charge and discharge state.
In some embodiments, the static differential pressure value may be calculated by measuring the maximum voltage value and the minimum voltage value of the battery when the battery is in a static state, i.e., the battery is in a non-charge-discharge state. This value may reflect the internal voltage balance condition of the battery. If the static pressure difference value is too large, the voltage of different single cells of the battery has larger difference, and balancing treatment is needed. When the battery is in a dynamic state, that is, the battery is charged and discharged, the dynamic differential pressure value can be calculated by measuring the maximum voltage value and the minimum voltage value of the battery. This value may reflect the charge and discharge state and the health of the battery. If the dynamic pressure difference value is too large, the battery has larger internal resistance and capacity loss, and maintenance or replacement is needed.
In some embodiments, after measuring the maximum voltage value and the minimum voltage value in the cell voltage values of all the cells, in addition to calculating the static pressure difference value and the dynamic pressure difference value, the positions of the maximum voltage value and the minimum voltage value need to be further determined, and recorded or prompted, so that a driver or a maintainer can be helped to better know the health condition and the performance state of the cells, and maintenance and management of the cells can be better performed, so that the faults or abnormal conditions of the cells can be timely found and solved, and safe and reliable operation of the cells is ensured.
In some embodiments, a battery uniformity fault alert is triggered when the voltage difference for each cell within the battery pack is greater than a set voltage threshold and the temperature difference is less than a set temperature threshold. Wherein, the value range of the set voltage threshold is 0.2V-0.4V.
In addition, in an embodiment, when the battery is currently in a static state, the static pressure difference value is greater than or equal to the first pressure difference value and the duration time reaches a second preset duration time, a battery consistency fault alarm is triggered, wherein the value range of the first pressure difference value can be 0.08V-0.12V.
The value range of the first differential pressure value is obtained by comprehensively considering various factors such as characteristic parameters of the battery, use environment and the like, and the specific value should be adjusted and optimized according to actual conditions. And, the condition that the duration is increased to the second preset time period is to avoid false alarm due to instantaneous voltage fluctuation or other interference factors.
When the battery is currently running or charged, the dynamic differential pressure value is larger than or equal to the second differential pressure value, and the duration reaches a third preset duration, and a battery consistency fault alarm is triggered.
In some embodiments, the differential pressure of the battery system is greater in the static state and the dynamic state, and the differential pressure in the static state is typically much smaller than in the dynamic state. The voltage is typically within 50mV when the battery system is in a static state, and may reach 400mV when the battery system is in a dynamic state. To distinguish between static and dynamic states, it may be determined by detecting the state of motion of the vehicle. When the vehicle is stationary, the battery system can be switched to a static state, and a static pressure difference threshold value is used for triggering a fault alarm; the battery system may be switched to a dynamic state when the vehicle is running or charging, and a dynamic pressure differential threshold is used to trigger a fault alert.
In general, by adopting the fault alarm condition described in the above embodiment, it is possible to determine whether there is a problem of battery consistency, and trigger a fault alarm when a specific condition is met, to remind the driver to perform balanced maintenance, thereby ensuring consistency and reliability of the battery system, prolonging the service life of the battery, and improving the endurance mileage and the use friendliness of the vehicle.
In some embodiments, after the vehicle battery consistency fault alarm is triggered, the vehicle battery consistency fault lamp can be controlled to be turned on to prompt the vehicle owner or the driver that the vehicle owner or the driver has the battery consistency fault, and the maintenance or the battery replacement is required, so that the safety and the reliability of the vehicle are ensured.
In addition, after the consistency fault alarm of the vehicle battery is triggered, the output power of the battery can be controlled to be reduced to a set power value, so that overdischarge or overcharge is avoided, and the health state of the battery is protected.
Specifically, it is first necessary to detect the running state of the vehicle, i.e., whether the vehicle is running. If the vehicle is in a driving state, when the battery consistency fault alarm is triggered, the output power of the battery can be controlled to be reduced to a set power value so as to reduce the load of the battery, thereby reducing the temperature of the battery, avoiding the occurrence of fault expansion, reminding a driver to pay attention to the state of the vehicle, and reducing the traffic risk caused by the battery problem during the driving of the vehicle.
The set power value needs to be adjusted according to specific situations. Meanwhile, in the process of controlling the reduction of the output power of the battery, the influence on the performance of the vehicle is required to be considered, so that the running safety and the driving experience of the vehicle are prevented from being influenced. In addition, the influence of the reduced power on the vehicle endurance mileage is also required to be considered, so that the problem that the vehicle endurance capacity is too low due to the excessive reduction of the battery output power is avoided.
A battery manager according to an embodiment of the present invention is described below with reference to fig. 2.
Fig. 2 is a block diagram of a battery manager according to one embodiment of the present invention, and as shown in fig. 2, the battery manager 10 of the embodiment of the present invention includes at least one processor 11 and a memory 12.
Wherein the memory 12 is communicatively connected to the at least one processor 11, and wherein the memory 12 stores a computer program executable by the at least one processor 11, the at least one processor 11 implementing the method of detecting a vehicle battery uniformity fault of the above embodiments.
In an embodiment, the battery manager 10 is an electronic device for monitoring and controlling a battery. The system can monitor parameters such as voltage, current, temperature and the like of the battery, can record the service condition of the battery, and can carry out fault diagnosis and fault alarm so as to ensure the safety and reliability of the battery.
According to the battery manager 10 of the embodiment of the present invention, the processor 11 implements the method of detecting the consistency fault of the vehicle battery described in the above embodiment by executing a computer program, and can accurately determine the consistency of the vehicle battery system by calculating the voltage difference between the maximum voltage and the minimum voltage of each cell voltage, and the temperature difference between the maximum temperature and the minimum temperature, comparing the voltage difference with a set voltage threshold, and comparing the temperature difference with a set temperature threshold. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle are improved.
A vehicle according to an embodiment of the invention is described below with reference to fig. 3.
Fig. 3 is a block diagram of a vehicle according to an embodiment of the present invention, and as shown in fig. 3, the vehicle 1 includes a battery pack 20 and a battery manager 10.
The battery pack 20 is a unit formed by a plurality of single batteries, and is used for providing electric energy required by the new energy automobile and driving the motor to operate. The battery manager 10 is connected to the battery pack 20 for monitoring and controlling the battery pack 20. The battery manager 10 can acquire, analyze and process the state parameters such as voltage, current, temperature, etc. of each unit cell in the battery pack 20 in real time. Meanwhile, the battery manager 10 can also control the charge and discharge of the battery pack 20, so as to ensure the safety and performance of the battery pack 20.
According to the vehicle 1 of the embodiment of the invention, by adopting the battery manager 10 described in the above embodiment, it is possible to monitor and manage a plurality of unit batteries in the battery pack 20. The battery manager 10 calculates the maximum voltage, the minimum voltage, the maximum temperature, and the minimum temperature in the battery pack 20 by calculating the voltage and the temperature of the unit cells using a method of detecting the consistency failure of the vehicle battery, and calculates the voltage difference and the temperature difference accordingly. By comparing the voltage difference and the temperature difference with the set threshold values, the consistency of the vehicle battery system can be accurately determined. Once the battery consistency fault occurs, the system can give an alarm in time to remind a driver to carry out balanced maintenance, so that the consistency and reliability of the battery system are ensured, the service life of the battery is prolonged, and the endurance mileage and the use friendliness of the vehicle 1 are improved.
The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the method for detecting the vehicle battery consistency fault described in the above embodiment. Specific implementation of the method of detecting a vehicle battery uniformity fault may be described with reference to the above embodiments.
The computer readable storage medium according to the embodiments of the present invention may include, but is not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical and magnetic storage media, and will not be described in detail herein.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (11)

1. A method of detecting a vehicle battery uniformity fault, comprising:
detecting a single voltage value of each single battery and a single temperature value of each single battery;
obtaining the maximum voltage value and the minimum voltage value in the single voltage values of all the single batteries, and obtaining the maximum temperature value and the minimum temperature value in the single temperature values of all the single batteries;
obtaining a voltage difference value according to the maximum voltage value and the minimum voltage value, and obtaining a temperature difference value according to the maximum temperature value and the minimum temperature value;
and if the voltage difference value is larger than the set voltage threshold value and the temperature difference value is smaller than the set temperature threshold value, triggering a battery consistency fault alarm.
2. The method of detecting a vehicle battery uniformity fault according to claim 1, wherein prior to obtaining a voltage difference value from said maximum voltage value and said minimum voltage value, said method further comprises:
detecting a current value of each single battery;
if the current value is smaller than a first preset current value and the duration time of the current value smaller than the first preset current value reaches a first preset duration time, determining that the battery is currently in a static state;
and if the current value is larger than a second preset current value, determining that the battery is currently in dynamic state, wherein the second preset current value is larger than the first preset current value.
3. The method of detecting a vehicle battery uniformity fault in accordance with claim 2, wherein obtaining a voltage difference from the maximum voltage value and the minimum voltage value comprises:
and when the battery is currently in a static state, obtaining a static pressure difference value according to the maximum voltage value and the minimum voltage value, or when the battery is currently in a dynamic state, obtaining a dynamic pressure difference value according to the maximum voltage value and the minimum voltage value.
4. The method of claim 3, wherein triggering a battery consistency fault alert comprises:
when the battery is currently in a static state, the static pressure difference value is larger than or equal to a first pressure difference value, and the duration reaches a second preset duration, a battery consistency fault alarm is triggered, wherein the value range of the first pressure difference value is 0.08V-0.12V;
and when the battery is currently in running or charging, the dynamic differential pressure value is larger than or equal to the second differential pressure value, and the duration time reaches a third preset duration time, triggering a battery consistency fault alarm.
5. The method for detecting a consistency fault of a vehicle battery according to claim 1, wherein the set voltage threshold is in a range of 0.2V to 0.4V.
6. The method of detecting a vehicle battery uniformity fault according to claim 5, further comprising:
and responding to the battery consistency fault alarm, and controlling a vehicle battery fault lamp to be lighted.
7. The method of detecting a vehicle battery uniformity fault according to claim 6, further comprising:
detecting a vehicle running state;
and if the vehicle is in a driving state, responding to the battery consistency fault alarm, and controlling the output power of the battery to be reduced to a set power value.
8. The method of detecting a vehicle battery uniformity fault according to claim 1, wherein after obtaining the maximum voltage value and the minimum voltage value among the cell voltage values of all the cells, the method further comprises:
and identifying the positions of the maximum voltage value and the minimum voltage value, and recording or prompting.
9. A battery manager, comprising:
at least one processor;
a memory communicatively coupled to the at least one processor;
stored in the memory is a computer program executable by the at least one processor, which when executing the computer program implements the method of detecting a vehicle battery consistency fault of any of claims 1-8.
10. A vehicle, characterized by comprising:
a battery pack including a plurality of unit cells;
the battery manager of claim 9, the battery manager coupled to the battery pack.
11. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the method of detecting a vehicle battery consistency failure as claimed in any of claims 1-8.
CN202310558809.5A 2023-05-17 2023-05-17 Method for detecting battery consistency fault, battery manager, vehicle and medium Pending CN116540112A (en)

Priority Applications (1)

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CN202310558809.5A CN116540112A (en) 2023-05-17 2023-05-17 Method for detecting battery consistency fault, battery manager, vehicle and medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310558809.5A CN116540112A (en) 2023-05-17 2023-05-17 Method for detecting battery consistency fault, battery manager, vehicle and medium

Publications (1)

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