CN116660771A - Lithium battery capacity consistency detection system and method - Google Patents

Lithium battery capacity consistency detection system and method Download PDF

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Publication number
CN116660771A
CN116660771A CN202211518237.XA CN202211518237A CN116660771A CN 116660771 A CN116660771 A CN 116660771A CN 202211518237 A CN202211518237 A CN 202211518237A CN 116660771 A CN116660771 A CN 116660771A
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capacity
consistency
time
lithium battery
charging
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CN202211518237.XA
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Chinese (zh)
Inventor
袁冬霞
陈功锋
曹瑞中
郑俊江
昝振峰
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Yutong Bus Co Ltd
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Yutong Bus Co Ltd
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Priority to CN202211518237.XA priority Critical patent/CN116660771A/en
Publication of CN116660771A publication Critical patent/CN116660771A/en
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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]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • G01R31/387—Determining ampere-hour charge capacity or SoC
    • G01R31/388—Determining ampere-hour charge capacity or SoC involving 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]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • 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]
    • G01R31/371—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with remote indication, e.g. on external chargers
    • 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]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention relates to a system and a method for detecting the consistency of the capacity of a lithium battery, and belongs to the technical field of vehicle power batteries. According to the method, after the lithium battery enters a charging platform period, the highest single battery voltage and the lowest single battery voltage are obtained, the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity are calculated, the change condition of the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity is counted, the ratio of the charging capacity to the rated capacity of the lithium battery system is calculated by utilizing the change value of the single extreme voltage to reach the threshold time difference, and the consistency deviation is calculated.

Description

Lithium battery capacity consistency detection system and method
Technical Field
The invention relates to a system and a method for detecting the consistency of the capacity of a lithium battery, and belongs to the technical field of vehicle power batteries.
Background
The power battery is an important component of new energy systems such as pure electric vehicles, hybrid electric vehicles, energy storage systems and the like, has various requirements such as high capacity, high output voltage, safe use, long service life and the like, and the lithium battery is excellent in performance requirements such as safety, capacity, service life and the like, so that the lithium battery can be widely used by electric vehicles, energy storage systems and the like. However, the lithium battery has inconsistent battery capacity due to the difference in the preparation process, so detection is required for the problem of battery capacity consistency. In theory, when the lithium battery meets the consistency requirement, the extreme inflection voltage should be the same value, but as shown in fig. 1, through the test of the lithium battery, the difference of the connection internal resistances of the voltages of each battery core in the battery system with normal consistency (such as different lengths of high-voltage aluminum bars and copper bars, different welding of the battery core poles, etc.) can cause the difference of voltages corresponding to the extreme inflection point in the charging process, and the voltages of two extreme inflection voltages of the battery with abnormal consistency shown in fig. 2 in the charging platform stage are also different, so that the consistency difference cannot be judged by directly using the extreme inflection voltage, and if the consistency difference is judged by directly using the extreme inflection voltage, misjudgment can exist.
Disclosure of Invention
The invention aims to provide a system and a method for detecting the consistency of the capacity of a lithium battery, which are used for solving the problem of inaccuracy existing in the existing consistency detection by adopting an extreme voltage inflection point.
In order to achieve the above object, the present invention provides a method comprising:
the invention discloses a method for detecting the capacity consistency of a lithium battery, which comprises the following steps:
1) After the lithium battery enters a charging platform period, the highest single battery voltage and the lowest single battery voltage are obtained, and the charging capacity of the unit of the highest single battery voltage and the charging capacity of the unit of the lowest single battery voltage are calculated;
2) Counting the variation of the highest monomer voltage unit charge capacity and the lowest monomer voltage unit charge capacity, taking the time when the slope of the highest monomer voltage unit charge capacity reaches the threshold value for the first time as the starting time, and taking the time when the slope of the lowest monomer voltage unit charge capacity reaches the threshold value for the first time as the ending time;
3) Calculating a charge capacity between a start time and a stop time;
4) And obtaining the consistent deviation amount according to the ratio of the charging capacity between the starting time and the ending time to the rated capacity of the lithium battery system.
Further, the charging capacity in the step 3) isWherein t1 is the start time, t2 is the end time, and i is the charging current of the lithium battery between t1 and t 2.
Because the charging voltage at the initial stage and the charging terminal is unstable, the charging current also changes rapidly, and the duration of the two stages is relatively short, the invention adopts the data of the long-duration and stable charging platform stage to carry out consistency judgment. The detected change curves of the extreme voltage and the charging capacity ratio of the consistent normal battery in the charging process are basically consistent, the change curves of the extreme voltage and the charging capacity ratio of the consistent abnormal battery in the charging process are obviously different at the charging start point, the charging tail end point and the inflection point of the charging platform, so that the consistency detection of the battery capacity can be directly carried out, the time period when the slopes of the highest single voltage unit charging capacity and the lowest single voltage unit charging capacity of the lithium battery system reach the threshold value for the first time is determined by calculating the slopes of the two extreme single voltage units charging capacity, the charging capacity is obtained by integrating the charging current of the time period, the consistency deviation is calculated by utilizing the charging capacity and the rated capacity ratio of the lithium battery system when the single extreme voltage reaches the inflection point, and the calculation method is simple and the detection result is accurate.
Further, when the obtained uniformity deviation exceeds the set deviation, the lithium battery uniformity is in an abnormal state.
Further, the method also comprises the step of alarming and reminding when the consistency is judged to be abnormal.
The consistency deviation amount obtained by the method exceeds the set deviation amount, namely exceeds the maximum consistency deviation allowed by manufacturers to the battery system, the consistency of the lithium battery is in an abnormal state, and the method carries out alarm reminding, so that the use safety of the lithium battery is improved.
Further, the method also includes transmitting the detected consistent deviation amount data to a monitoring platform.
The method comprises the steps of sending the detected consistency deviation data to the monitoring platform, and sending the obtained data to the monitoring platform in real time, so that monitoring staff can know the state of the lithium battery more quickly.
The lithium battery capacity consistency detection system comprises a voltage acquisition module and a data processing module, wherein the voltage acquisition module acquires the highest single battery voltage and the lowest single battery voltage of a lithium battery, the data processing module is used for calculating the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity after the lithium battery enters a charging platform period, counting the change condition of the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity, taking the time when the slope of the highest single battery voltage unit charging capacity reaches a threshold value for the first time as starting time, taking the time when the slope of the lowest single battery voltage unit charging capacity reaches the threshold value for the first time as ending time, calculating the charging capacity between the starting time and the ending time, and obtaining the consistency deviation amount according to the ratio of the charging capacity between the starting time and the ending time and the rated capacity of the lithium battery system.
Further, the data processing module determines the charging capacity by adopting an ampere-hour integration method, and the charging capacity is expressed asWherein t1 is the start time, t2 is the end time, and i is the charging current of the lithium battery between t1 and t 2.
The invention provides a lithium battery capacity consistency detection system, wherein a voltage acquisition module in the system acquires voltage to a data processing module, the data processing module calculates the change condition of the charging capacity of the highest unit voltage and the charging capacity of the lowest unit voltage, determines the time period when the slopes of the charging capacities of the two unit voltages reach a threshold value for the first time, obtains the charging capacity by adopting an ampere-hour integration method, and calculates the consistency deviation by utilizing the charging capacity and the rated capacity ratio of a lithium battery system when the extreme voltage of the unit reaches an inflection point. The system can realize the detection of the consistency of the battery only by the voltage acquisition module and the data processing module, and the calculation procedure is simple when the data processing is carried out.
Further, the voltage acquisition module is a battery management system, and the highest single voltage and the lowest single voltage are acquired through the battery management system.
Further, the detection system also comprises an alarm module, and the alarm module is used for alarming and reminding when the consistency of the capacity of the lithium battery is abnormal, wherein the consistency abnormal is that the consistency deviation calculated by the data processing module exceeds the set deviation.
According to the invention, an alarm module is added, the consistency deviation quantity threshold value set by a manufacturer is used for comparison, and when the consistency of the capacity of the lithium battery is abnormal, the alarm module alarms and reminds, so that the use safety of the battery is improved.
Further, the detection system also comprises a communication module, and the communication module sends the consistency deviation data obtained by calculation of the data processing module to the monitoring platform.
The communication module added in the invention sends the obtained consistency deviation data to the monitoring platform in real time, and monitoring staff can know the state of the lithium battery in real time to carry out later maintenance.
Drawings
FIG. 1 is a graph of variation in system SOC versus extreme voltage during a consistent normal battery system charge process according to the present invention;
FIG. 2 is a graph of variation in system SOC versus extreme voltage during charging of a consistent abnormal battery system in accordance with the present invention;
FIG. 3 is a graph showing the variation of the system SOC according to the embodiment of the invention, showing the ratio of the extreme voltage to the charge point capacitance in the charging process of a consistent normal battery system;
FIG. 4 is a graph showing the change of the system SOC according to the ratio of the extreme voltage to the charge point capacitance in the charge process of the battery system with abnormal consistency in the embodiment of the invention;
FIG. 5 is a graph showing the change of the ratio of the extreme voltage to the charge point capacitance during the charging process of the battery system according to the embodiment of the invention;
fig. 6 is a graph showing a unit charge capacity value of a cell voltage during a charging process of a battery system according to an embodiment of the present invention;
fig. 7 is a flowchart of a lithium battery consistency detection method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Example of lithium Battery Capacity consistency detection method
In the invention, taking a lithium iron phosphate battery of an electric vehicle as an example, the charging process of the lithium iron phosphate battery generally comprises three stages, namely a charging initial stage, a charging end stage and a charging platform stage. Because the charging start and the charging end are stages of rapid voltage change, and the duration time of the two stages is relatively short, the consistency deviation amount of the battery cannot be accurately calculated, so that the voltage needs to be waited to be stabilized and enter a charging platform stage, an inflection point can appear in the platform stage, and the consistency deviation amount is calculated according to the charging capacity value when the inflection point appears.
Firstly, after a lithium iron phosphate battery enters a charging process and enters a platform period, acquiring the change condition of the charging capacity of the highest unit voltage and the charging capacity of the lowest unit voltage, taking the time when the slope of the charging capacity of the highest unit voltage reaches a threshold value for the first time as the starting time, taking the time when the slope of the charging capacity of the lowest unit voltage reaches the threshold value for the first time as the ending time, and calculating the charging capacity between the starting time and the ending time; and calculating the consistency deviation according to the obtained charging capacity, if the consistency deviation is larger than the set deviation, carrying out alarm reminding on the capacity consistency of the battery system, and simultaneously sending abnormal data to a monitoring platform, wherein the monitoring platform pushes abnormal vehicle maintenance information to after-sales personnel after acquiring the abnormal information.
The method is based on the defects of the prior art, and tests prove that the consistency is normal in the charging process of the lithium iron phosphate battery system as shown in figure 3, and the ratio dV of the maximum voltage to the charging capacity max The curves of/dq and the minimum voltage to charge capacity ratio dVmin/dq substantially coincide. During charging, dV of the lithium iron phosphate battery system with abnormal consistency shown in FIG. 4 max /dq and dV min The dq curves have obvious differences in the charge start, the charge platform inflection point and the charge end, so the invention adopts the mode of the ratio of the extreme voltage to the charge capacity to calculate the consistency deviation delta SOC of the battery system. As shown in fig. 5, for dV max /dq and dV min The extreme voltage corresponding to the difference of the dq curve can be seen as the maximum voltage V max And minimum voltage V min The inflection point of the entering platform has a rising edge, and the consistency deviation of the charge capacity calculation system between the rising edges is utilized, namely the charge capacity value dV of the highest unit voltage unit is directly utilized max Slope km of/dq reaches a threshold value, and is equal to the lowest monomer voltage unit charge capacity value dV min The charging capacity is calculated for the period of time in which the slope kn of/dq reaches the threshold.
The specific implementation flow of the method is shown in fig. 7, and specifically comprises the following steps:
1. after the lithium iron phosphate battery enters a charging process and enters a platform period, the highest single voltage and the highest low single voltage in the battery system are collected, and the unit charge capacity value dV of the highest single voltage in the battery system is calculated max Calculating the lowest cell voltage unit charge capacity value dV in the battery system min /dq and slope.
2. The highest monomer voltage unit charge capacity value dV max When the slope km of/dq reaches the threshold kx for the first time, this time is denoted as the start time t 1 The method comprises the steps of carrying out a first treatment on the surface of the Minimum monomer voltage unit charge capacity value dV min When the slope kn of/dq reaches the threshold kx for the first time, this time is denoted as the expiration time t 2 The method comprises the steps of carrying out a first treatment on the surface of the And will start time t 1 To terminateTime t 2 Integrating the charging current between them to obtain the charging capacity of the time period, namely the starting time t 1 To the time t 2 Charge capacity between:in this case, as shown in fig. 6, when charging is performed using a lithium iron phosphate standard battery, the unit cell voltage charge capacity value dV/dq during charging is calculated. In the charging process, the lithium iron phosphate standard battery has a plateau period, and the variation of the single voltage unit charge capacity value dV/dq can form a plateau in the process, and the value corresponding to the plateau is the threshold kx.
3. Calculating a consistency deviation Δsoc=q/Q 0 I.e. t 1 To t 2 Charge capacity Q between and rated capacity Q of lithium iron phosphate battery system 0 Ratio of the two.
4. Comparing the calculated consistency deviation with a set deviation amount (maximum consistency deviation of the battery system is allowed by manufacturers), if the set deviation amount is not exceeded, the vehicle battery system is not abnormal and maintenance is not needed, and if the consistency deviation of the battery system is larger than the set deviation amount, namely delta SOC>△SOC 0 And if the consistency of the lithium iron phosphate batteries of the vehicle is abnormal, alarming and reminding are carried out, meanwhile, abnormal data are transmitted to a monitoring platform, and the monitoring platform detects that the vehicle with abnormal consistency of the batteries is pushed to after-sales personnel for vehicle maintenance.
Embodiments of lithium Battery Capacity consistency detection System
The lithium battery capacity consistency detection system comprises a voltage acquisition module, a data processing module, an alarm module and a communication module.
The voltage acquisition module is a battery management system and is used for acquiring the highest single battery voltage V of the lithium battery max And the lowest cell voltage V min 。
The data processing module calculates data by utilizing a controller of the vehicle terminal, for example, the data processing can be performed by using a vehicle controller, the module is used for calculating the highest single voltage unit charging capacity and the lowest single voltage unit charging capacity, counting the change values of the highest single voltage unit charging capacity and the lowest single voltage unit charging capacity in unit time, namely km and kn, taking the time when the slope of the highest single voltage unit charging capacity reaches a threshold value for the first time as starting time, taking the time when the slope of the lowest single voltage unit charging capacity reaches the threshold value for the first time as ending time, calculating the charging capacity between the starting time and the ending time, and obtaining the consistency deviation amount according to the ratio of the charging capacity between the starting time and the ending time and the rated capacity of the lithium battery system.
The data processing module compares the calculated consistency deviation with a set deviation amount (the maximum consistency deviation of the battery system is allowed by manufacturers), if the consistency deviation of the battery system is larger than the set deviation amount, namely delta SOC>△SOC 0 The abnormal condition appears in the uniformity of the lithium iron phosphate battery of vehicle, and alarm module reports to the police and reminds this unusual battery, and the unusual data of this battery passes through communication module transmission to monitor platform simultaneously, and monitor platform detects the unusual vehicle propelling movement of battery uniformity and carries out vehicle maintenance to the after-sales personnel, has improved battery safety in utilization.

Claims (10)

1. The lithium battery capacity consistency detection method is characterized by comprising the following steps of:
1) After the lithium battery enters a charging platform period, the highest single battery voltage and the lowest single battery voltage are obtained, and the charging capacity of the unit of the highest single battery voltage and the charging capacity of the unit of the lowest single battery voltage are calculated;
2) Counting the variation of the highest monomer voltage unit charge capacity and the lowest monomer voltage unit charge capacity, taking the time when the slope of the highest monomer voltage unit charge capacity reaches the threshold value for the first time as the initial time, and taking the time when the slope of the lowest monomer voltage unit charge capacity reaches the threshold value for the first time as the termination time;
3) Calculating a charge capacity between a start time and a stop time;
4) And obtaining the consistent deviation amount according to the ratio of the charging capacity between the starting time and the ending time to the rated capacity of the lithium battery system.
2. The method for detecting the consistency of the capacity of a lithium battery according to claim 1, wherein the charge capacity in the step 3) isWherein t1 is the start time, t2 is the end time, and i is the charging current of the lithium battery between t1 and t 2.
3. The method for detecting the consistency of the capacity of lithium batteries according to claim 1, wherein the consistency of the lithium batteries is in an abnormal state when the obtained consistency deviation exceeds a set deviation.
4. The method for detecting the consistency of the capacity of the lithium battery according to claim 3, further comprising the step of alarming when the consistency is judged to be abnormal.
5. The method for detecting the consistency of the capacity of the lithium battery according to claim 1 or 4, further comprising transmitting the detected consistency deviation amount data to a monitoring platform.
6. The lithium battery capacity consistency detection system comprises a voltage acquisition module and a data processing module, and is characterized in that the voltage acquisition module is used for acquiring the highest single battery voltage and the lowest single battery voltage of a lithium battery, the data processing module is used for calculating the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity after the lithium battery enters a charging platform period, counting the change condition of the highest single battery voltage unit charging capacity and the lowest single battery voltage unit charging capacity, determining the time when the change value of the highest single battery voltage unit charging capacity reaches a threshold value for the first time as starting time, determining the time when the change value of the lowest single battery voltage unit charging capacity reaches the threshold value for the first time as ending time, calculating the charging capacity between the starting time and the ending time, and obtaining the consistency deviation amount according to the ratio of the charging capacity between the starting time and the ending time and the rated capacity of the lithium battery system.
7. The lithium battery capacity consistency detection system of claim 6, wherein the data processing module determines the charge capacity using an ampere-hour integration method, the charge capacity being expressed asWherein t1 is the start time, t2 is the end time, and i is the charging current of the lithium battery between t1 and t 2.
8. The lithium battery capacity consistency detection system of claim 6, wherein the voltage acquisition module is a battery management system through which the highest cell voltage and the lowest cell voltage are acquired.
9. The system according to claim 6 or 7, further comprising an alarm module for alerting when abnormal conditions of the consistency of the capacities of the lithium batteries occur, wherein the abnormal conditions of the consistency are that the consistency deviation amount calculated by the data processing module exceeds a set deviation amount.
10. The lithium battery capacity consistency detection system according to claim 6, further comprising a communication module for transmitting the consistency deviation amount data calculated by the data processing module to the monitoring platform.
CN202211518237.XA 2022-11-29 2022-11-29 Lithium battery capacity consistency detection system and method Pending CN116660771A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
CN116660771A true CN116660771A (en) 2023-08-29

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