CN113049975A - Power battery system fault diagnosis method, readable storage medium and vehicle - Google Patents
Power battery system fault diagnosis method, readable storage medium and vehicle Download PDFInfo
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- CN113049975A CN113049975A CN201911368870.3A CN201911368870A CN113049975A CN 113049975 A CN113049975 A CN 113049975A CN 201911368870 A CN201911368870 A CN 201911368870A CN 113049975 A CN113049975 A CN 113049975A
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- battery
- fault
- power battery
- diagnosis method
- fault diagnosis
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16585—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 for individual pulses, ripple or noise and other applications where timing or duration is of importance
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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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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a power battery system fault diagnosis method, which comprises the following steps: the battery management system completes initialization and starts to detect faults; the battery management system estimates the state of health of the battery and corrects the fault judgment condition calibration quantity according to the state of health of the battery; and the battery management system detects the fault in real time, and if the fault judgment condition is met, a corresponding fault processing strategy is carried out. According to the fault diagnosis method for the power battery system, the fault judgment condition parameters are corrected in real time according to the health state of the battery, so that the full-range coverage detection is carried out on the fault, and the whole vehicle system is enabled to reach the safe state through a reasonable fault processing strategy, so that the personal safety is ensured.
Description
Technical Field
The invention relates to the field of battery system fault diagnosis, in particular to a power battery system fault diagnosis method, a readable storage medium and a vehicle.
Background
At present, the battery fault condition standard quantity is constant in the life cycle of an automobile. However, in practice, the performance parameters of the battery may change with the increase of the number of battery uses, the abuse of the battery, and the like, and if the determination condition calibration amount is not adjusted, the failure may be missed and a safety accident may occur.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, a first objective of the present invention is to provide a power battery system fault diagnosis method, which can obtain a calibrated amount of correction value according to the battery health status, and then determine whether the battery system is in a safe state according to the read value;
a second objective of the present invention is to provide a readable storage medium for executing the power battery system fault diagnosis method;
a third object of the present invention is to provide a vehicle including the above readable storage medium.
In order to achieve the above object, a first aspect of the present invention provides a power battery system fault diagnosis method, including:
the battery management system completes initialization and starts to detect faults;
the battery management system estimates the state of health of the battery and corrects the fault judgment condition calibration quantity according to the state of health of the battery;
and the battery management system detects the fault in real time, and if the fault judgment condition is met, a corresponding fault processing strategy is carried out.
According to the fault diagnosis method for the power battery system, the fault judgment condition parameters are corrected in real time according to the health state of the battery, so that the full-range coverage detection is carried out on the fault, and the whole vehicle system is enabled to reach the safe state through a reasonable fault processing strategy, so that the personal safety is ensured.
Further, the battery management system obtains a correction coefficient theta according to the battery health state, and obtains the fault determination condition calibration quantity of the current battery according to the correction coefficient.
Further, the cell overvoltage threshold of the power battery is V1, the calibrated quantity of the fault determination condition comprises a cell voltage V2, and when the cell voltage V2 meets the following conditions: when V2 is greater than or equal to V1 (1-theta) and continues for a preset time T1, the fault judgment condition is satisfied.
Further, the preset time T1 satisfies: t1 is more than or equal to 3 s.
Further, the cell over-discharge threshold of the power battery is V3, the fault determination condition calibration quantity comprises a cell voltage V4, and when the cell voltage V4 meets the following conditions: and when the voltage V4 is not less than V3 (1+ theta) and continues for the preset time T2, the fault judgment condition is met.
Further, the preset time T2 satisfies: t2 is more than or equal to 3 s.
Further, the calibration amount of the failure determination condition further includes: battery temperature and amperage.
Further, the battery management system monitors the battery temperature and the current intensity through a battery temperature sensor and a current sensor, respectively.
The second aspect of the present invention provides a readable storage medium, and the power battery system fault diagnosis method is executed when the computer reads the readable storage medium.
A third aspect of the invention provides a vehicle comprising the above-mentioned readable storage medium.
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 above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of calibration quantity correction according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A power battery system fault diagnosis method according to an embodiment of the present invention is described below with reference to fig. 1, including: the battery management system completes initialization and starts to detect faults; the battery management system estimates the state of health of the battery and corrects the fault judgment condition calibration quantity according to the state of health of the battery; and the battery management system detects the fault in real time, and if the fault judgment condition is met, a corresponding fault processing strategy is carried out.
According to the fault diagnosis method for the power battery system, the fault judgment condition parameters are corrected in real time according to the health state of the battery, so that the full-range coverage detection is carried out on the fault, and the whole vehicle system is enabled to reach the safe state through a reasonable fault processing strategy, so that the personal safety is ensured.
According to an embodiment of the present invention, the battery management system obtains the correction coefficient θ according to the state of health of the battery, and obtains the calibration amount of the current fault determination condition of the battery according to the correction coefficient. Wherein the battery state of health value may be read directly from a meter attached to the battery; the relationship between the correction coefficient theta and the battery state of health value can be obtained through experiments; the maximum values of the correction parameters of different battery types and different battery models are different, and the maximum values of the correction parameters are provided for battery cell manufacturers.
According to one embodiment of the invention, the cell overvoltage threshold of the power battery is V1, the calibrated quantity of the fault determination condition comprises a cell voltage V2, and when the cell voltage V2 meets: when V2 is more than or equal to V1 (1-theta) and lasts for a preset time T1, the fault judgment condition is met; preferably, the preset time T1 satisfies: t1 is more than or equal to 3 s. The value of the cell voltage V2 is greater than or equal to the corrected cell overvoltage threshold value of the power battery and lasts for more than 3s, and at the moment, the system judges that the cell overvoltage fault occurs, and corresponding fault treatment is needed.
According to one embodiment of the invention, the cell over-discharge threshold of the power battery is V3, the calibrated quantity of the fault determination condition comprises a cell voltage V4, and the cell voltage V4 satisfies: when V4 is not less than V3 (1+ theta) and lasts for preset time T2, the fault judgment condition is met; preferably, the preset time T2 satisfies: t2 is more than or equal to 3 s. And the value of the cell voltage V4 is less than or equal to the corrected cell overvoltage threshold value of the power battery and lasts for more than 3s, and at the moment, the system judges that the cell overdischarge fault exists and needs to perform corresponding fault treatment.
According to an embodiment of the present invention, the calibration amount of the fault determination condition further includes a battery temperature and a current intensity; specifically, the battery management system monitors the battery temperature and the current intensity through a battery temperature sensor and a current sensor, respectively. And judging whether the fault condition is met or not by comparing the corrected battery temperature threshold or the corrected current intensity threshold with the battery temperature monitored by the battery temperature sensor and the current intensity monitored by the current sensor, and carrying out corresponding processing.
According to an embodiment of the present invention, a computer reads the readable storage medium to execute the power battery system fault diagnosis method.
According to an embodiment of the present invention, a vehicle includes the above-described readable storage medium. The battery in the vehicle can be monitored and processed in time according to the corrected standard quantitative value, so that the occurrence of fire and explosion of the battery is avoided, and the safety of personnel is ensured.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A power battery system fault diagnosis method is characterized by comprising the following steps:
the battery management system completes initialization and starts to detect faults;
the battery management system estimates the state of health of the battery and corrects the fault judgment condition calibration quantity according to the state of health of the battery;
and the battery management system detects the fault in real time, and if the fault judgment condition is met, a corresponding fault processing strategy is carried out.
2. The power battery system fault diagnosis method according to claim 1, characterized in that the battery management system obtains a correction coefficient θ according to the state of health of the battery, and obtains a fault determination condition calibration amount of the current battery according to the correction coefficient.
3. The power battery system fault diagnosis method according to claim 1, wherein the cell overvoltage threshold of the power battery is V1, the calibrated quantity of the fault determination condition comprises a cell voltage V2, and when the cell voltage V2 satisfies: when V2 is greater than or equal to V1 (1-theta) and continues for a preset time T1, the fault judgment condition is satisfied.
4. The power battery system fault diagnosis method according to claim 3, characterized in that the preset time T1 is satisfied: t1 is more than or equal to 3 s.
5. The power battery system fault diagnosis method according to claim 1, wherein the cell over-discharge threshold of the power battery is V3, the calibrated quantity of the fault determination condition comprises a cell voltage V4, and when the cell voltage V4 satisfies: and when the voltage V4 is not less than V3 (1+ theta) and continues for the preset time T2, the fault judgment condition is met.
6. The power battery system fault diagnosis method according to claim 5, characterized in that the preset time T2 is satisfied: t2 is more than or equal to 3 s.
7. The power battery system fault diagnostic method of claim 1, wherein the calibration amount of fault determination conditions further comprises: battery temperature and amperage.
8. The power battery system fault diagnosis method according to claim 1, characterized in that the battery management system monitors the battery temperature and the current intensity by means of a battery temperature sensor and a current sensor, respectively.
9. A readable storage medium, characterized in that the power battery system fault diagnosis method according to any one of claims 1 to 8 is executed when the computer reads the storable medium.
10. A vehicle characterized by comprising the readable storage medium of claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911368870.3A CN113049975A (en) | 2019-12-26 | 2019-12-26 | Power battery system fault diagnosis method, readable storage medium and vehicle |
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| CN201911368870.3A CN113049975A (en) | 2019-12-26 | 2019-12-26 | Power battery system fault diagnosis method, readable storage medium and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113791350A (en) * | 2021-08-06 | 2021-12-14 | 陕西汽车集团股份有限公司 | Battery failure prediction method |
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| CN113791350B (en) * | 2021-08-06 | 2024-05-14 | 陕西汽车集团股份有限公司 | Battery fault prediction method |
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