CN113296003B - Power battery differential pressure early warning method and system - Google Patents
Power battery differential pressure early warning method and system Download PDFInfo
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- CN113296003B CN113296003B CN202110529308.5A CN202110529308A CN113296003B CN 113296003 B CN113296003 B CN 113296003B CN 202110529308 A CN202110529308 A CN 202110529308A CN 113296003 B CN113296003 B CN 113296003B
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- power battery
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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
-
- 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
-
- 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
Abstract
The invention discloses a power battery pressure difference early warning method, which comprises the steps of acquiring charging voltage parameters in real time under the charging state of a power battery of an electric automobile, and judging that the power battery has faults when the fluctuation voltage difference of the charging voltage exceeds a set pressure difference threshold A and the fluctuation duration exceeds a set time threshold B. According to the invention, through reasonably setting early warning faults after the combination analysis of the battery core characteristics, the use characteristics, the SOC, the temperature, the power and the like of the battery pack, the problems can be accurately found, the effects of protecting the battery and prompting the customer to maintain can be achieved, and the user perception problems such as charging, endurance and the like caused by overlarge voltage difference of the battery core are reduced.
Description
Technical Field
The invention relates to the technical field of safety of power batteries of electric automobiles.
Background
At present, most of the voltage difference judgment of all series-connected battery cells in a battery pack by a pure electric vehicle only adopts a larger fault value to judge, but if the voltage difference judgment is carried out according to the set threshold value, the battery cells are always in a state that the battery cells cannot be maintained and need to be replaced when the fault is judged, and in the early use process, serious problems of less charging, short endurance and the like are often caused by the battery cells.
Disclosure of Invention
The invention improves the pressure difference early warning measures of the power battery of the automobile, realizes the pressure difference early warning method 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 above purpose, the technical scheme adopted by the invention is as follows: a power battery pressure difference early warning method comprises the steps of acquiring charging voltage parameters in real time under the charging state of a power battery of an electric automobile, and judging that the power battery has faults when the fluctuation voltage difference of the charging voltage exceeds a set pressure difference threshold A and the fluctuation duration exceeds a set time threshold B.
And after judging that the power battery has faults in the charging state, sending out a fault alarm signal, and reducing the charging current to C of a normal current value, wherein the C is smaller than 100.
After the power battery is judged to have faults in the charging state, if the charging voltage fluctuation voltage difference is lower than the set voltage difference threshold D and the maintaining time exceeds the set time threshold E, the alarm signal is cleared, and the charging current is restored to the normal current value.
Under the discharge state of the power battery of the electric automobile, the discharge voltage parameter and the battery working temperature value are obtained in real time, and when the following conditions are met simultaneously, the power battery is judged to have faults:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold F;
the duration of the fluctuation exceeds a set time threshold G;
the discharge current is larger than a set current threshold H;
the lowest temperature of the power battery is greater than the set temperature threshold I.
And after judging that the power battery has faults in the discharging state, sending out a fault alarm signal, limiting the discharging of the power battery, if the current discharging power is larger than the set discharging upper limit power, limiting the discharging power to be reduced to the set discharging threshold value, and if the current discharging power is lower than the set discharging lower limit power, limiting the discharging power to the creeping power.
After the power battery is judged to have faults in the discharging state, if the discharging voltage fluctuation voltage difference is lower than the set voltage difference threshold J, the alarm signal is cleared, and the limitation of discharging the power battery is canceled.
The early warning system for executing the power battery pressure difference early warning method is provided with a processor, a power 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 wire, and a control signal output end of the processor is connected with a power battery management unit.
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, through reasonably setting early warning faults after the combination analysis of the battery core characteristics, the use characteristics, the SOC, the temperature, the power and the like of the battery pack, the problems can be accurately found, the effects of protecting the battery and prompting the customer to maintain can be achieved, and the user perception problems such as charging, endurance and the like caused by overlarge voltage difference of the battery core are reduced.
Drawings
The following is a brief description of what is expressed in each of the drawings in the specification of the invention:
fig. 1 is a schematic diagram of a power battery differential pressure warning method.
Detailed Description
The following detailed description of the embodiments of the invention, such as the shape and construction of the components, the mutual positions and connection relationships between the components, the roles and working principles of the components, the manufacturing process and the operating and using method, etc., is provided to assist those skilled in the art in a more complete, accurate and thorough understanding of the inventive concept and technical solution of the present invention.
The power battery pressure difference early warning system is provided with a processor, the processor is used for signal processing to judge whether a fault exists, a power end of the power battery is connected with a signal input interface of the processor through a voltage acquisition circuit, and the charge and discharge voltage conditions of the power battery are acquired in real time through the voltage acquisition circuit, so that the processor can analyze fluctuation of the charge and discharge voltage difference 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, the temperature conditions of the power battery can be sent to the processor in real time, the processor is used for judging the working condition of the power battery, an alarm signal output end of the processor is connected with a whole vehicle instrument through the signal lines, the whole vehicle instrument lights a battery fault lamp to prompt a user to enter a station for processing, a control signal output end of the processor is connected with a power battery management unit, the working state of the power battery is limited by the battery management unit, and the problem that the excessive use of a battery core is prevented from being caused by high-power operation to trigger a larger safety fault.
As shown in fig. 1, based on the above system, the power battery pressure difference early warning method is divided into a charging state and a discharging state;
in the charged state, the power battery is judged to have faults when the following conditions are met simultaneously:
when the fluctuation voltage difference of the charging voltage exceeds a set voltage difference threshold A;
the duration of the fluctuation exceeds the set time threshold B.
And after judging that the power battery has faults in the charging state, sending out a fault alarm signal, and reducing the charging current to C of a normal current value, wherein the C is smaller 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 the set voltage difference threshold D and the maintaining time exceeds the set time threshold E, the alarm signal is cleared, and the charging current is recovered to the normal current value.
And in a discharging state, judging that the power battery has faults if the following conditions are met:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold F;
the duration of the fluctuation exceeds a set time threshold G;
the discharge current is larger than a set current threshold H;
the lowest temperature of the power battery is greater than the set temperature threshold I.
And after judging that the power battery has faults in the discharging state, sending out a fault alarm signal, limiting the discharging of the power battery, if the current discharging power is larger than the set discharging upper limit power, limiting the discharging power to be reduced to the set discharging threshold value, and if the current discharging power is lower than the set discharging lower limit power, limiting the discharging power to the creeping power.
After the power battery is judged to have faults in the discharging state, if the discharging voltage fluctuation voltage difference is lower than the set voltage difference threshold J, the alarm signal is cleared, and the limitation of discharging the power battery is canceled.
The method judges whether the current battery cell pressure difference has abnormal fluctuation or not through the characteristics of the current SOC, temperature, power and the like of the power battery to carry out early warning prompt, carries out power limiting treatment on the whole vehicle to prevent the battery cell from being excessively used to bring greater risk, prompts a user to enter the station for maintenance through instrument display evaluation, reasonably sets the evaluation threshold value for the current SOC, temperature, power and the like of the power battery to improve the judging accuracy, limits the power treatment to prevent the battery cell from being excessively used after triggering the threshold value, and the instrument lights a fault lamp to prompt the user to enter the station for treatment.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified or applied directly to other applications without modification, as long as various insubstantial modifications of the method concept and technical solution of the invention are adopted, all within the scope of the invention.
Claims (4)
1. A power battery pressure difference early warning method is characterized in that: 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 faults when the fluctuation voltage difference of the charging voltage exceeds a set pressure difference threshold A and the fluctuation duration exceeds a set time threshold B;
after judging that the power battery has faults in the charging state, sending out a fault alarm signal, and reducing the charging current to C of a normal current value, wherein C is smaller than 100;
after judging that the power battery has faults in the charging state, if the charging voltage fluctuation voltage difference is lower than a set voltage difference threshold D and the maintaining time exceeds a set time threshold E, clearing an alarm signal and recovering the charging current to a normal current value;
under the discharge state of the power battery of the electric automobile, the discharge voltage parameter and the battery working temperature value are obtained in real time, and when the following conditions are met simultaneously, the power battery is judged to have faults:
the discharge voltage fluctuation voltage difference exceeds a set voltage difference threshold F;
the duration of the fluctuation exceeds a set time threshold G;
the discharge current is larger than a set current threshold H;
the lowest temperature of the power battery is larger than a set temperature threshold I;
and after judging that the power battery has faults in the discharging state, sending out a fault alarm signal, limiting the discharging of the power battery, if the current discharging power is larger than the set discharging upper limit power, limiting the discharging power to be reduced to the set discharging threshold value, and if the current discharging power is lower than the set discharging lower limit power, limiting the discharging power to the creeping power.
2. The power cell differential pressure warning method according to claim 1, characterized in that: after the power battery is judged to have faults in the discharging state, if the discharging voltage fluctuation voltage difference is lower than the set voltage difference threshold J, the alarm signal is cleared, and the limitation of discharging the power battery is canceled.
3. An early warning system for executing the power battery pressure difference early warning method according to claim 1 or 2, 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 wire, and a control signal output end of the processor is connected with a power battery management unit.
4. The warning system of claim 3 wherein: 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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| CN113296003B true CN113296003B (en) | 2023-09-12 |
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| 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 |
| CN113815486B (en) * | 2021-10-22 | 2023-03-31 | 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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