CN113296003A - Power battery voltage difference early warning method and system - Google Patents
Power battery voltage difference early warning method and system Download PDFInfo
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- CN113296003A CN113296003A CN202110529308.5A CN202110529308A CN113296003A CN 113296003 A CN113296003 A CN 113296003A CN 202110529308 A CN202110529308 A CN 202110529308A CN 113296003 A CN113296003 A CN 113296003A
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/448—End of discharge regulating measures
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- 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
-
- 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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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a power battery voltage difference early warning method, which is characterized in that charging voltage parameters are acquired in real time under the charging state of a power battery of an electric automobile, and when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold value A and the fluctuation duration time exceeds a set time threshold value B, the power battery is judged to have faults. According to the invention, the battery cell characteristics, the service characteristics, the SOC, the temperature, the power and the like of the battery pack are combined and analyzed, and then the early warning fault is reasonably set, so that the problems can be accurately found, the battery can be protected, the customer maintenance can be prompted, and the user perception problems of charging, endurance and the like caused by overlarge battery cell pressure difference are reduced.
Description
Technical Field
The invention relates to the technical field of safety of power batteries of electric automobiles.
Background
At present, pure electric vehicles on the market judge the pressure difference between each series-connected battery cell in a battery pack, most of the judgment is carried out by selecting a larger fault value, but if the judgment is carried out according to the set threshold value, the battery cell is always in a state that the battery cell cannot be maintained and needs to be replaced when the fault occurs, and serious problems such as less charging, short endurance and the like are caused in the early use process due to the reason of the battery cell.
Disclosure of Invention
The invention improves the early warning measure of the pressure difference of the power battery of the automobile, realizes the early warning method of the pressure difference of the power battery, and reduces the user perception problems of charging, endurance and the like caused by overlarge pressure difference of the battery core.
In order to achieve the purpose, the invention adopts the technical scheme that: a power battery voltage difference early warning method is characterized in that charging voltage parameters are obtained in real time when a power battery of an electric automobile is in a charging state, and when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold value A and the fluctuation duration time exceeds a set time threshold value B, the power battery is judged to have a fault.
And after the power battery is judged to have faults in the charging state, a fault alarm signal is sent out, the charging current is reduced to C% of the normal current value, and C is less than 100%.
And after the power battery is judged to have faults in the charging state, if the charging voltage fluctuation voltage difference is lower than a set voltage difference threshold value D and the maintaining time exceeds a set time threshold value E, clearing the alarm signal and recovering the charging current to a normal current value.
Under the discharge state of the power battery of the electric automobile, obtaining a discharge voltage parameter and a battery working temperature value in real time, and judging that the power battery has a fault when the following conditions are met simultaneously:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold value F;
the fluctuation duration exceeds a set time threshold G;
the discharge current is greater than a set current threshold value H;
the lowest temperature of the power battery is greater than a set temperature threshold value I.
And if the current discharge power is lower than the set discharge lower limit power, the discharge power is limited to creep power.
And after the power battery is judged to have a fault in the discharging state, if the discharging voltage fluctuation voltage difference is lower than a set voltage difference threshold J, clearing the alarm signal and canceling the limitation on the discharging of the power battery.
The early warning system is provided with a processor, a power supply end of the power battery is connected with a signal input interface of the processor through a voltage acquisition circuit, an alarm signal output end of the processor is connected with a whole vehicle instrument through a signal line, and a control signal output end of the processor is connected with a power battery management unit.
And the power battery is provided with a temperature sensor, and the temperature sensor is connected with a signal input interface of the processor through a signal line.
According to the invention, the battery cell characteristics, the service characteristics, the SOC, the temperature, the power and the like of the battery pack are combined and analyzed, and then the early warning fault is reasonably set, so that the problems can be accurately found, the battery can be protected, the customer maintenance can be prompted, and the user perception problems of charging, endurance and the like caused by overlarge battery cell pressure difference are reduced.
Drawings
The following is a brief description of the contents of each figure in the description of the present invention:
FIG. 1 is a schematic diagram of a power battery voltage difference warning method.
Detailed Description
The following description of the embodiments with reference to the drawings is provided to describe the embodiments of the present invention, and the embodiments of the present invention, such as the shapes and configurations of the components, the mutual positions and connection relationships of the components, the functions and working principles of the components, the manufacturing processes and the operation and use methods, etc., will be further described in detail to help those skilled in the art to more completely, accurately and deeply understand the inventive concept and technical solutions of the present invention.
The power battery differential pressure early warning system is provided with a processor, the processor is used for signal processing and judging whether faults exist, a power supply end of a power battery is connected with a signal input interface of the processor through a voltage acquisition circuit, the charging and discharging voltage condition of the power battery is acquired in real time through the voltage acquisition circuit, so that the processor can analyze the fluctuation of the charging and discharging voltage differential pressure of the power battery, a plurality of temperature sensors are arranged on the power battery, the temperature sensors are connected with the signal input interface of the processor through signal lines and can transmit the temperature condition of the power battery to the processor in real time, the processor can judge the working condition of the power battery, an alarm signal output end of the processor is connected with a finished automobile instrument through the signal lines, the finished automobile instrument lights a battery fault lamp to prompt a user to enter a station for processing, and a control signal output end of the processor is connected with a power battery management unit, the battery management unit limits the working state of the power battery, and prevents the problem of excessive use of the battery core due to high-power work from triggering larger safety faults.
As shown in fig. 1, based on the above system, the power battery voltage difference early warning method is divided into a charging state and a discharging state;
in the charging state, the power battery is judged to have a fault when the following conditions are simultaneously met:
when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold A;
the duration of the fluctuation exceeds a set time threshold B.
And after the power battery is judged to have faults in the charging state, a fault alarm signal is sent out, the charging current is reduced to C% of the normal current value, and C is less than 100%.
And after the power battery is judged to have faults in the charging state, if the charging voltage fluctuation voltage difference is lower than a set voltage difference threshold value D and the maintaining time exceeds a set time threshold value E, clearing the alarm signal and recovering the charging current to a normal current value.
And under the discharge state, judging that the power battery has a fault if the following conditions are simultaneously met:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold value F;
the fluctuation duration exceeds a set time threshold G;
the discharge current is greater than a set current threshold value H;
the lowest temperature of the power battery is greater than a set temperature threshold value I.
And if the current discharge power is lower than the set discharge lower limit power, the discharge power is limited to creep power.
And after the power battery is judged to have a fault in the discharging state, if the discharging voltage fluctuation voltage difference is lower than a set voltage difference threshold J, clearing the alarm signal and canceling the limitation on the discharging of the power battery.
The method comprises the steps of judging whether the current battery cell voltage difference has abnormal fluctuation or not according to the characteristics of the current SOC, temperature, power and the like of a power battery, carrying out early warning prompt, carrying out power limiting treatment on the whole vehicle to prevent the cell from being excessively used and bringing greater risks, displaying estimation values through an instrument to prompt a user to enter a station for maintenance, reasonably setting the estimation value threshold value according to the conditions of the current SOC, the temperature, the power and the like of the power battery, improving judgment accuracy, carrying out power limiting treatment on the whole vehicle after triggering the threshold value to prevent the cell from being excessively used, and lighting a fault lamp by the instrument to prompt the user to enter the station for treatment.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (8)
1. A power battery voltage difference early warning method is characterized by comprising the following steps: and acquiring charging voltage parameters in real time under the charging state of the power battery of the electric automobile, and judging that the power battery has a fault when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold A and the fluctuation duration time exceeds a set time threshold B.
2. The power battery differential pressure warning method according to claim 1, characterized in that: and after the power battery is judged to have faults in the charging state, a fault alarm signal is sent out, the charging current is reduced to C% of the normal current value, and C is less than 100%.
3. The power battery differential pressure warning method according to claim 2, characterized in that: and after the power battery is judged to have faults in the charging state, if the charging voltage fluctuation voltage difference is lower than a set voltage difference threshold value D and the maintaining time exceeds a set time threshold value E, clearing the alarm signal and recovering the charging current to a normal current value.
4. The power battery differential pressure early warning method according to claim 1, 2 or 3, characterized in that: under the discharge state of the power battery of the electric automobile, obtaining a discharge voltage parameter and a battery working temperature value in real time, and judging that the power battery has a fault when the following conditions are met simultaneously:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold value F;
the fluctuation duration exceeds a set time threshold G;
the discharge current is greater than a set current threshold value H;
the lowest temperature of the power battery is greater than a set temperature threshold value I.
5. The power battery differential pressure warning method according to claim 4, characterized in that: and if the current discharge power is lower than the set discharge lower limit power, the discharge power is limited to creep power.
6. The power battery differential pressure warning method according to claim 5, characterized in that: and after the power battery is judged to have a fault in the discharging state, if the discharging voltage fluctuation voltage difference is lower than a set voltage difference threshold J, clearing the alarm signal and canceling the limitation on the discharging of the power battery.
7. An early warning system for executing the early warning method of the differential pressure of the power battery according to the claims 1-6, which is characterized in that: the system is provided with a processor, a power supply end of the power battery is connected with a signal input interface of the processor through a voltage acquisition circuit, an alarm signal output end of the processor is connected with a whole vehicle instrument through a signal line, and a control signal output end of the processor is connected with a power battery management unit.
8. The warning system of claim 7, wherein: and the power battery is provided with a temperature sensor, and the temperature sensor is connected with a signal input interface of the processor through a signal line.
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| CN202110529308.5A CN113296003B (en) | 2021-05-14 | 2021-05-14 | Power battery differential pressure early warning method and system |
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| CN202110529308.5A CN113296003B (en) | 2021-05-14 | 2021-05-14 | Power battery differential pressure early warning method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113815486A (en) * | 2021-10-22 | 2021-12-21 | 广州小鹏汽车科技有限公司 | Power battery monitoring method and device, server and storage medium |
| CN113933735A (en) * | 2021-09-30 | 2022-01-14 | 蜂巢能源科技有限公司 | Battery fault determination method and device, storage medium and processor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113933735A (en) * | 2021-09-30 | 2022-01-14 | 蜂巢能源科技有限公司 | Battery fault determination method and device, storage medium and processor |
| CN113933735B (en) * | 2021-09-30 | 2023-07-14 | 蜂巢能源科技有限公司 | Battery fault determining method, device, storage medium and processor |
| CN113815486A (en) * | 2021-10-22 | 2021-12-21 | 广州小鹏汽车科技有限公司 | Power battery monitoring method and device, server and storage medium |
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