CN112782587A - Power battery monomer abnormal change detection method and system - Google Patents
Power battery monomer abnormal change detection method and system Download PDFInfo
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- CN112782587A CN112782587A CN202011557437.7A CN202011557437A CN112782587A CN 112782587 A CN112782587 A CN 112782587A CN 202011557437 A CN202011557437 A CN 202011557437A CN 112782587 A CN112782587 A CN 112782587A
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- 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
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- G—PHYSICS
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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Abstract
The invention discloses a method for detecting abnormal change of a power battery monomer, which comprises the following steps: establishing a monomer dynamic data acquisition model, and acquiring voltage data of monomer cells in real time; obtaining the highest monomer voltage and the lowest monomer voltage according to the acquired voltage data; acquiring a voltage curve in a charging and discharging process, and respectively calculating to obtain the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes; comparing the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judging whether the monomer battery cell has abnormal change. And establishing a monomer acquisition model, identifying the highest monomer voltage and the lowest monomer voltage, tracking the change condition in real time in the vehicle running or charging process, and carrying out corresponding processing according to the monomer voltage change. The abnormal conditions that can appear in the monomer electricity core of quick detection and effective discernment.
Description
Technical Field
The invention belongs to the technical field of power battery detection, and particularly relates to a method and a system for detecting abnormal change of a power battery monomer.
Background
With the rapid development of new energy technology, power batteries are applied more and more in various fields and also widely applied to new energy vehicles, and the safety of the power batteries is more and more important. At present, more safety accidents of new energy vehicles are mainly reflected in charging, power batteries are overcharged and punctured, and electric cores are inflated, bulge, liquid leakage and the like, so that the phenomena of thermal runaway and thermal diffusion of the power battery system, which lead to vehicle spontaneous combustion, and serious economic loss are caused. In addition, the above-mentioned problems also occur in the case where the cell voltage abnormally drops during the continuous discharge of the battery. At present, the processing means for preventing the power battery from being overcharged is mainly to process the highest monomer voltage of the power battery by detection, the detection mode is single, the consideration is not comprehensive enough, and in addition, the detection mode is to be identified as far as possible under the non-charging state, so that the power battery is prevented from being continuously used under the non-health condition.
When the detection method is designed for the power battery management system, the possible abnormal conditions of the single battery cell can be quickly detected and effectively identified, and a series of safety accidents caused by damage to the single battery cell due to further deterioration of the abnormal conditions are avoided.
The patent with publication number CN 111208445 a discloses a power battery abnormal cell identification method, which comprises the following steps: generating an abnormity judgment threshold according to the vehicle working condition data set; receiving the working condition data of the single vehicle, and judging the single battery state of the single vehicle according to the working condition data of the single vehicle and the abnormal judgment threshold value; and updating the vehicle working condition data set through the single vehicle working condition data, and updating the abnormity judgment threshold according to the updated vehicle working condition data set. The method is characterized in that the abnormal indexes of the single batteries are calculated only through voltage data of the single batteries, whether the single batteries are abnormal or not is judged through the abnormal indexes of the single batteries and the abnormal judgment threshold value, and comprehensive judgment is not carried out in combination with different stages of charging and discharging. The abnormal conditions that probably appear in the single electric core can not effectual discernment, can not lock the position of monomer.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a method and a system for detecting abnormal changes of power battery cells, wherein a cell collection model is established, a highest cell voltage and a lowest cell voltage are identified from all cell cores in a battery system, a position of the highest cell and a position of the lowest cell are identified at the same time, a change condition is tracked in real time during a vehicle operation or charging process according to information of the identified cell, and corresponding processing is performed according to changes of the cell voltages. The abnormal conditions that can appear in the monomer electricity core of quick detection and effective discernment.
The technical scheme of the invention is as follows:
a power battery single body abnormal change detection method comprises the following steps:
s01: establishing a monomer dynamic data acquisition model, and acquiring voltage data of monomer cells in real time;
s02: obtaining the highest monomer voltage and the lowest monomer voltage according to the acquired voltage data of the monomer battery cells;
s03: acquiring voltage curves of the charging and discharging processes, and respectively calculating to obtain the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
s04: comparing the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judging whether the monomer battery cell has abnormal change.
In a preferred embodiment, the step S01 is implemented byThe battery management system collects the voltage of the single battery cell in the power battery system, and the single dynamic data collection model is established as follows: v = OCV + IiMultiplying by R, and setting a window range;
wherein V is dynamic voltage, OCV is open-circuit voltage, IiDynamic current, R internal resistance.
In a preferred technical solution, in the step S03, the current, the cell voltage, and the road spectrum are obtained according to the charging and discharging process curves, and if it is determined that the vehicle is in a traveling discharge state, the discharging or the charging is determined according to the current direction, and the highest cell voltage change, the lowest cell voltage change, the cell highest voltage change rate, and the cell lowest voltage change rate are respectively calculated according to the discharging or the charging.
In a preferred technical solution, the step S04 of determining whether the cell electric core has abnormal changes includes:
in the charging process, if the highest cell voltage change is less than 0 or the lowest cell voltage change is less than 0 or the highest cell voltage change rate is less than 0 or the lowest cell voltage change rate is less than 0, judging that the cell is in an unhealthy state, and stopping charging; otherwise, judging that the single battery cell is in a healthy state;
in the discharging process of driving, if the highest monomer voltage change and the lowest monomer voltage change are less than or equal to 0, the pressure difference between the highest monomer voltage change and the lowest monomer voltage change is less than a set value, and the corresponding highest monomer voltage change rate and the corresponding lowest monomer voltage change rate are less than the set value, judging that the monomer battery cell is in a healthy state, otherwise, judging that the monomer battery cell is in an unhealthy state, and controlling to stop running;
in the process of driving and electricity returning, if the highest cell voltage change and the lowest cell voltage change are greater than or equal to 0 and the corresponding highest and lowest cell voltage change rates are smaller than a set value, the cell core is judged to be in a healthy state, otherwise, the cell core is judged to be in an unhealthy state, and the operation is controlled to stop.
In a preferred technical scheme, the step S02 further includes obtaining initial cell locations of the highest cell voltage and the lowest cell voltage, and the step S03 obtains the cell locations of the highest cell voltage and the lowest cell voltage in real time in the charging and discharging processes, compares the cell locations with the initial cell locations, compares the voltage of the cell with a threshold if the cell locations are different from each other, and determines that the cell is abnormal if the cell locations are smaller than the threshold.
The invention also discloses a power battery monomer abnormal change detection system, which comprises:
the single dynamic data acquisition model establishing module is used for establishing a single dynamic data acquisition model and acquiring voltage data of the single battery cell in real time;
the calculation acquisition module is used for acquiring the highest cell voltage and the lowest cell voltage according to the acquired voltage data of the cell;
the parameter calculation module is used for acquiring voltage curves of the charging and discharging processes and respectively calculating the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
and the abnormity judgment module compares the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judges whether the monomer battery cell has abnormal change.
In an optimal technical scheme, the voltage of a monomer cell in the power battery system is acquired through a battery management system in the monomer dynamic data acquisition model establishing module, and the monomer dynamic data acquisition model is established by: v = OCV + IiMultiplying by R, and setting a window range;
wherein V is dynamic voltage, OCV is open-circuit voltage, IiDynamic current, R internal resistance.
In an optimal technical scheme, in the parameter calculation module, the current, the cell voltage and the road spectrum are obtained according to the charging and discharging process curves, if the vehicle is judged to be the traveling discharge, the discharge or the return electricity is judged according to the current direction, and the highest cell voltage change, the lowest cell voltage change, the cell highest voltage change rate and the cell lowest voltage change rate are respectively calculated according to the discharge or the return electricity.
In a preferred technical solution, the determining, in the abnormality determining module, whether there is an abnormal change in the cell electric core includes:
in the charging process, if the highest cell voltage change is less than 0 or the lowest cell voltage change is less than 0 or the highest cell voltage change rate is less than 0 or the lowest cell voltage change rate is less than 0, judging that the cell is in an unhealthy state, and stopping charging; otherwise, judging that the single battery cell is in a healthy state;
in the discharging process of driving, if the highest monomer voltage change and the lowest monomer voltage change are less than or equal to 0, the pressure difference between the highest monomer voltage change and the lowest monomer voltage change is less than a set value, and the corresponding highest monomer voltage change rate and the corresponding lowest monomer voltage change rate are less than the set value, judging that the monomer battery cell is in a healthy state, otherwise, judging that the monomer battery cell is in an unhealthy state, and controlling to stop running;
in the process of driving and electricity returning, if the highest cell voltage change and the lowest cell voltage change are greater than or equal to 0 and the corresponding highest and lowest cell voltage change rates are smaller than a set value, the cell core is judged to be in a healthy state, otherwise, the cell core is judged to be in an unhealthy state, and the operation is controlled to stop.
In an optimal technical scheme, the calculation and acquisition module further includes an initial monomer electric core position for acquiring a highest monomer voltage and a lowest monomer voltage, the parameter calculation module acquires the monomer electric core positions of the highest monomer voltage and the lowest monomer voltage in real time in a charging and discharging process, compares the monomer electric core positions with the initial monomer electric core position, compares the voltage of the monomer electric core with a threshold value if the monomer electric core positions are different from the initial monomer electric core position, and judges that the monomer electric core is abnormal if the voltage of the monomer electric core is smaller than the threshold value.
Compared with the prior art, the invention has the beneficial effects that:
1. and establishing a monomer acquisition model, identifying the highest monomer voltage Vmax and the lowest monomer voltage Vmin from all monomer electric cores in the battery system, identifying the position N1 where the highest monomer is located and the position N2 where the lowest monomer is located, tracking the change condition in real time in the vehicle running or charging process according to the identified information of the battery monomers, and carrying out corresponding processing according to the change of the monomer voltage. The abnormal conditions that can appear in the monomer electricity core of quick detection and effective discernment.
2. And acquiring all monomer voltage data in the system from the dynamic voltage acquisition model, and if the non-highest and lowest monomer voltages change abnormally in the charging and discharging process, fully identifying and locking the monomer positions after confirmation.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic block diagram of a power battery cell abnormal change detection system according to the present invention;
FIG. 2 is a flow chart of the abnormal change detection method of the power battery cell of the present invention;
FIG. 3 is a block diagram of a system for detecting the voltage of a single power battery according to the present invention;
fig. 4 is a data diagram illustrating that no cell abnormal protection is adopted in the charging process.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
As shown in fig. 1, a power battery cell abnormal change detection system establishes a cell collection model based on voltage collection of each battery cell in a battery system by a battery management system, identifies a highest cell voltage Vmax and a lowest cell voltage Vmin from all battery cells in the battery system, identifies a position N1 where the highest cell is located and a position N2 where the lowest cell is located, tracks a change condition in real time in a vehicle operation or charging process according to the identified battery cell information, and performs corresponding processing according to a cell voltage change. The method specifically comprises the following steps:
the single dynamic data acquisition model establishing module is used for establishing a single dynamic data acquisition model and acquiring voltage data of the single battery cell in real time;
the calculation acquisition module is used for acquiring the highest cell voltage and the lowest cell voltage according to the acquired voltage data of the cell;
the parameter calculation module is used for acquiring voltage curves of the charging and discharging processes and respectively calculating the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
and the abnormity judgment module compares the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judges whether the monomer battery cell has abnormal change.
In another embodiment, as shown in fig. 2, a method for detecting abnormal change of power battery cells includes the following steps:
s01: establishing a monomer dynamic data acquisition model, and acquiring voltage data of monomer cells in real time;
s02: obtaining the highest monomer voltage and the lowest monomer voltage according to the acquired voltage data of the monomer battery cells;
s03: acquiring voltage curves of the charging and discharging processes, and respectively calculating to obtain the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
s04: comparing the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judging whether the monomer battery cell has abnormal change.
As shown in fig. 3, in step S01, the battery management system collects voltages of the individual battery cells in the power battery system, and the model for collecting dynamic data of the individual battery cells is established as follows: v = OCV + IiMultiplying by R, and setting a window range;
wherein V is dynamic voltage, OCV is open-circuit voltage, IiDynamic current, R internal resistance.
In the step S02, the highest cell voltage Vmax and the lowest cell voltage Vmin are identified according to the collected cell voltage data, positions N1 and N2 of the highest and lowest cells are obtained and stored, and the obtained highest and lowest cell voltages are updated in real time.
In step S03, the current, the cell voltage, and the road spectrum are obtained according to the voltage curve during the charging and discharging process, and if it is determined that the vehicle is in a traveling discharge state, the discharging or the return current is determined according to the current direction, and the highest cell voltage change, the lowest cell voltage change, the highest cell voltage change rate, and the lowest cell voltage change rate are respectively calculated according to the discharging or the return current.
In the continuous charging process, whether the system charging current tends to be stable or the cell voltage gradually rises is judged according to the change of the charging current. At, the highest cell voltage changes from V1 to V2 and the lowest cell voltage changes from V3 to V4 per unit time, and the calculation is performed based on the data: the highest cell voltage change was obtained: Δ Vmax = V2-V1, lowest cell voltage change: Δ Vmin = V4-V3, monomer highest voltage change rate = Δ Vmax/Δ t, and monomer lowest voltage change rate = Δ Vmin/Δ t, thereby obtaining a change window.
In the driving process, because the driving has discharge and feedback, the judgment can not be carried out according to fixed conditions singly, and the judgment needs to be carried out to some extent, therefore, the delta t of the cell voltage in unit time is collected, the highest cell voltage is changed from Vd1 to Vd2, the bulk voltage is changed from Vd3 to Vd4, the current direction, I, is judged1Is discharged, I2Judging the calculation condition for power return:
1. warp has I1When the current judges discharge, Δ Vdmax = Vd2-Vd1, the lowest cell voltage change: Δ Vdmin = Vd4-Vd3, cell highest voltage change rate = Δ Vdmax/Δ t, cell lowest voltage change rate = Δ Vdmin/Δ t;
2. warp has I2When the current judges the electricity return, the delta Vdmax = Vd2-Vd1, the lowest cell voltage change: Δ Vdmin = Vd4-Vd3, cell highest voltage change rate = Δ Vdmax/Δ t, cell lowest voltage change rate = Δ Vdmin/Δ t;
and obtaining a monomer change window according to the current judgment condition.
The step S04 of determining whether there is an abnormal change in the cell electric core includes:
in the charging process, if the highest cell voltage change is less than 0 or the lowest cell voltage change is less than 0 or the highest cell voltage change rate is less than 0 or the lowest cell voltage change rate is less than 0, judging that the cell is in an unhealthy state, and stopping charging; otherwise, judging that the single battery cell is in a healthy state;
in the discharging process of driving, if the highest monomer voltage change and the lowest monomer voltage change are less than or equal to 0, the pressure difference between the highest monomer voltage change and the lowest monomer voltage change is less than a set value, and the corresponding highest monomer voltage change rate and the corresponding lowest monomer voltage change rate are less than the set value, judging that the monomer battery cell is in a healthy state, otherwise, judging that the monomer battery cell is in an unhealthy state, and controlling to stop running;
in the process of driving and electricity returning, if the highest cell voltage change and the lowest cell voltage change are greater than or equal to 0 and the corresponding highest and lowest cell voltage change rates are smaller than a set value, the cell core is judged to be in a healthy state, otherwise, the cell core is judged to be in an unhealthy state, and the operation is controlled to stop.
Step S02 further includes obtaining initial cell locations of the highest cell voltage and the lowest cell voltage, and step S03 obtains the cell locations of the highest cell voltage and the lowest cell voltage in real time during the charging and discharging process, compares the cell locations with the initial cell locations, compares the voltage of the cell with a threshold if the cell locations are different from the initial cell locations, and determines that the cell is abnormal if the cell locations are smaller than the threshold.
Specifically, the cell voltage change condition is judged according to the change window value obtained by calculation, and the correlation processing is carried out:
1. judging and processing according to the obtained single voltage change window value, wherein in the process of gun insertion charging, energy is transmitted into the power battery, so that delta Vmax and delta Vmin in the charging process and the corresponding voltage change rate are positive values, otherwise, judging that the battery is in an unhealthy state, immediately stopping charging, and troubleshooting;
2. during the discharging process of a running vehicle, a large pulse current instantly appears in the energy output processing stage of a battery system, when delta Vdmax is less than or equal to 0 and delta Vdmin is less than or equal to 0, namely the pressure difference is less than a set value, and the corresponding highest and lowest monomer change rates are less than the set value, the cell is judged to be in a healthy state, otherwise, the cell is judged to be in an unhealthy state, the cell is controlled to stop running, and the fault problem is eliminated;
3. during the driving power-back process, large pulse feedback current appears after the battery system is judged to be in an energy feedback stage, when delta Vdmax is larger than or equal to 0, delta Vdmin is larger than or equal to 0, and the highest and lowest monomer change rates are smaller than a set value, the battery is judged to be in a healthy state, otherwise, the battery is judged to be in an unhealthy state, the operation is controlled to stop, and fault problem troubleshooting is carried out;
4. in the process of charging and discharging, the highest and lowest monomer voltages and positions obtained initially according to system electrification are compared, if the voltage of the monomer at other positions suddenly becomes the highest or the lowest and is lower than a serious fault set value, the monomer is judged to be abnormal, charging and discharging are immediately stopped, and fault problem troubleshooting is carried out.
As shown in fig. 4, in a charging process, the highest monomer slowly rises, the lowest monomer starts to fall after slowly rising, and then suddenly and directly falls, and thermal runaway of the battery cell is caused because monomer abnormality judgment is not adopted.
When the monomer abnormality is processed, the running mode of the vehicle power battery is judged according to the current direction, all the current monomer voltages are collected, the change value delta V and the voltage change rate delta V/delta t of the monomer voltages are calculated, and whether the current power battery is abnormal or not is judged according to the calculated result condition so as to be capable of being recognized and processed as early as possible.
According to the cell abnormality detection method, under the same current condition, the difference between the capacity and the internal resistance of the cells in the power battery system can be identified through the change value delta V of the cell voltage, the faster the delta V changes under the same current indicates that the capacity of the cells is lower and the internal resistance is higher, the battery management system stores relevant data, and the relevant data are used as basic data for comparison and analysis when cell abnormality is judged.
According to the establishment of the single dynamic data acquisition model, the consistency of the current power battery can be analyzed from the data, and whether the consistency of the power battery is in a better level or not in the current environment can be judged.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A power battery monomer abnormal change detection method is characterized by comprising the following steps:
s01: establishing a monomer dynamic data acquisition model, and acquiring voltage data of monomer cells in real time;
s02: obtaining the highest monomer voltage and the lowest monomer voltage according to the acquired voltage data of the monomer battery cells;
s03: acquiring voltage curves of the charging and discharging processes, and respectively calculating to obtain the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
s04: comparing the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judging whether the monomer battery cell has abnormal change.
2. The method for detecting abnormal changes of power battery cells according to claim 1, wherein in step S01, the voltage of each cell in the power battery system is collected by the battery management system, and a dynamic cell data collection model is established as follows: v = OCV + IiMultiplying by R, and setting a window range;
wherein V is dynamic voltage, OCV is open-circuit voltage, IiDynamic current, R internal resistance.
3. The method as claimed in claim 1, wherein in step S03, the current, the cell voltage and the road spectrum are obtained from the voltage curves during charging and discharging, and if it is determined that the vehicle is in a traveling state, the discharging or the charging is determined according to the current direction, and the highest cell voltage change, the lowest cell voltage change, the highest cell voltage change rate and the lowest cell voltage change rate are respectively calculated according to the discharging or the charging.
4. The method for detecting abnormal changes in power battery cells according to claim 1, wherein the step S04 of determining whether abnormal changes exist in the battery cells includes:
in the charging process, if the highest cell voltage change is less than 0 or the lowest cell voltage change is less than 0 or the highest cell voltage change rate is less than 0 or the lowest cell voltage change rate is less than 0, judging that the cell is in an unhealthy state, and stopping charging; otherwise, judging that the single battery cell is in a healthy state;
in the discharging process of driving, if the highest monomer voltage change and the lowest monomer voltage change are less than or equal to 0, the pressure difference between the highest monomer voltage change and the lowest monomer voltage change is less than a set value, and the corresponding highest monomer voltage change rate and the corresponding lowest monomer voltage change rate are less than the set value, judging that the monomer battery cell is in a healthy state, otherwise, judging that the monomer battery cell is in an unhealthy state, and controlling to stop running;
in the process of driving and electricity returning, if the highest cell voltage change and the lowest cell voltage change are greater than or equal to 0 and the corresponding highest and lowest cell voltage change rates are smaller than a set value, the cell core is judged to be in a healthy state, otherwise, the cell core is judged to be in an unhealthy state, and the operation is controlled to stop.
5. The method for detecting abnormal changes in power battery cells according to claim 1, wherein step S02 further includes obtaining initial cell locations of the highest cell voltage and the lowest cell voltage, and step S03 obtains the cell locations of the highest cell voltage and the lowest cell voltage in real time during charging and discharging, compares the cell locations with the initial cell locations, compares the voltage of the cell with a threshold if the cell locations are different from each other, and determines that the cell is abnormal if the cell locations are smaller than the threshold.
6. A power battery cell abnormal change detection system is characterized by comprising:
the single dynamic data acquisition model establishing module is used for establishing a single dynamic data acquisition model and acquiring voltage data of the single battery cell in real time;
the calculation acquisition module is used for acquiring the highest cell voltage and the lowest cell voltage according to the acquired voltage data of the cell;
the parameter calculation module is used for acquiring voltage curves of the charging and discharging processes and respectively calculating the highest monomer voltage change, the lowest monomer voltage change, the highest monomer voltage change rate and the lowest monomer voltage change rate according to the charging and discharging processes;
and the abnormity judgment module compares the obtained highest monomer voltage change, the lowest monomer voltage change, the monomer highest voltage change rate and the monomer lowest voltage change rate with a set threshold value, and judges whether the monomer battery cell has abnormal change.
7. The system for detecting the abnormal change of the single power battery according to claim 6, wherein the single dynamic data acquisition model establishing module acquires the voltage of the single battery cell in the power battery system through the battery management system, and the establishing of the single dynamic data acquisition model is as follows: v = OCV + IiMultiplying by R, and setting a window range;
wherein V is dynamic voltage, OCV is open-circuit voltage, IiDynamic current, R internal resistance.
8. The system for detecting abnormal changes in power battery cells as claimed in claim 6, wherein the parameter calculation module obtains a current, a cell voltage and a road spectrum according to the voltage curves during charging and discharging, determines discharging or charging according to the current direction if it is determined that the vehicle is in driving discharging, and calculates a highest cell voltage change, a lowest cell voltage change, a cell highest voltage change rate and a cell lowest voltage change rate according to the discharging or charging.
9. The system for detecting abnormal changes in power battery cells according to claim 6, wherein the determining whether abnormal changes exist in the battery cells in the abnormality determining module includes:
in the charging process, if the highest cell voltage change is less than 0 or the lowest cell voltage change is less than 0 or the highest cell voltage change rate is less than 0 or the lowest cell voltage change rate is less than 0, judging that the cell is in an unhealthy state, and stopping charging; otherwise, judging that the single battery cell is in a healthy state;
in the discharging process of driving, if the highest monomer voltage change and the lowest monomer voltage change are less than or equal to 0, the pressure difference between the highest monomer voltage change and the lowest monomer voltage change is less than a set value, and the corresponding highest monomer voltage change rate and the corresponding lowest monomer voltage change rate are less than the set value, judging that the monomer battery cell is in a healthy state, otherwise, judging that the monomer battery cell is in an unhealthy state, and controlling to stop running;
in the process of driving and electricity returning, if the highest cell voltage change and the lowest cell voltage change are greater than or equal to 0 and the corresponding highest and lowest cell voltage change rates are smaller than a set value, the cell core is judged to be in a healthy state, otherwise, the cell core is judged to be in an unhealthy state, and the operation is controlled to stop.
10. The system of claim 6, wherein the calculation and acquisition module further includes an initial cell position for acquiring a highest cell voltage and a lowest cell voltage, and the parameter calculation module acquires the cell positions of the highest cell voltage and the lowest cell voltage in real time during charging and discharging, compares the cell positions with the initial cell positions, compares the voltage of the cell with a threshold if the cell positions are different from each other, and determines that the cell is abnormal if the cell positions are smaller than the threshold.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN113884886A (en) * | 2021-10-22 | 2022-01-04 | 深圳市新威尔电子有限公司 | Method for screening abnormal charging and discharging core in battery test production |
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