CN113928179A - Power battery monitoring method in whole vehicle standing state - Google Patents
Power battery monitoring method in whole vehicle standing state Download PDFInfo
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- CN113928179A CN113928179A CN202111446436.XA CN202111446436A CN113928179A CN 113928179 A CN113928179 A CN 113928179A CN 202111446436 A CN202111446436 A CN 202111446436A CN 113928179 A CN113928179 A CN 113928179A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000005059 dormancy Effects 0.000 claims abstract description 19
- 230000002159 abnormal effect Effects 0.000 claims abstract description 17
- 230000006855 networking Effects 0.000 claims abstract description 16
- 230000007958 sleep Effects 0.000 claims description 45
- 230000004622 sleep time Effects 0.000 claims description 40
- 238000009413 insulation Methods 0.000 claims description 11
- 230000002035 prolonged effect Effects 0.000 claims description 6
- 230000002452 interceptive effect Effects 0.000 abstract description 2
- 238000007405 data analysis Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of 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 monitoring method in a standing state of a whole vehicle, which enables a vehicle networking system to wake up a whole vehicle control system when timing reaches a timing wake-up time through interactive setting of a battery management system and the vehicle networking system, and further wakes up the battery management system to perform primary power battery monitoring; and the battery management system sets the next dormancy time according to the state information of the power battery after awakening and before dormancy, thereby more reasonably monitoring the state of the power battery. When the power battery state is abnormal and important observation is needed, the next dormancy time is shortened, and the monitoring timeliness is ensured; when the power battery state is not abnormal and no key observation is needed, the timing awakening frequency can be reduced by prolonging the next dormancy time, so that the low-voltage power consumption of the vehicle system is reduced.
Description
Technical Field
The invention belongs to the field of development of battery management systems of new energy automobiles, and particularly relates to a power battery monitoring method in a whole automobile standing state.
Background
The power battery, especially the lithium ion battery, in the new energy automobile has the characteristic of a certain thermal runaway risk because the state of the power battery is not absolutely stable, and is always the object needing to be strictly monitored in the whole power system. How to design a battery management system capable of monitoring the state of a power battery in real time becomes a problem to be solved urgently by developers. In addition, nowadays when big data enable each field, the power battery is monitored in a cloud to become a classic scene of big data application. The method comprises the steps that a large number of power batteries running in the market upload real-time monitoring data to a cloud server, the cloud algorithm is used for analyzing the mass data to monitor the battery state of each new energy automobile, the high-level application scene can be used for estimating the current health state of the batteries by utilizing big data analysis, predicting the service life of the batteries, even early warning of the thermal runaway risk of the batteries and the like. The implementation of the application prospect is not a crucial factor, namely battery data, when the whole vehicle starts to run, the battery management system works normally and can collect and upload data in real time, and in the standing state of the whole vehicle, when the whole vehicle is in a standing dormant state, the battery management system enters a dormant mode due to the consideration of low-voltage power consumption, and the battery management system cannot continuously collect and upload battery state information in the dormant mode. For big data analysis, the state data of the battery after being fully placed and the charge-discharge polarization is eliminated is more credible for identifying the health state of the battery, so the information of the whole vehicle after being placed is more important.
In addition, a plurality of schemes are provided, and the battery management system can keep all-weather monitoring for 24 hours without directly keeping the whole vehicle standing and sleeping; and a section of data is monitored and uploaded after the battery management system controller is awakened under set conditions through an internal self-awakening function of the battery management system controller. The schemes all need to put higher requirements on a battery management system or a complete vehicle power system, and the cost is correspondingly increased.
Disclosure of Invention
The invention aims to provide a power battery monitoring method under a standing state of a whole vehicle, so as to monitor the state of a power battery more reasonably.
The invention relates to a power battery monitoring method under a whole vehicle standing state, which comprises the following steps:
when the whole vehicle is placed still and starts to sleep, the battery management system (namely BMS) records the current state information of the power battery, determines the sleep time, sends a sleep timing request and the sleep time to the vehicle networking system (namely T-BOX), and then sleeps.
After receiving the dormancy timing request and the dormancy time, the vehicle networking system sets a timing awakening time according to the dormancy time and starts timing, and when the timing awakening time is reached, the vehicle networking system awakens the whole vehicle control system, and the whole vehicle control system awakens the battery management system.
The battery management system immediately records the current power battery state information after awakening, and compares and analyzes the power battery state information recorded after awakening and the power battery state information recorded before dormancy:
if the power battery state is abnormal, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current power battery state information, shortens the sleep time (relative to the previous sleep), sends a sleep timing request and the shortened sleep time to the internet of vehicles system, and then sleeps.
If the power battery state is not abnormal, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current power battery state information, keeps the sleep time unchanged or prolongs the sleep time (relative to the previous sleep), sends a sleep timing request and the unchanged sleep time or the prolonged sleep time to the vehicle networking system, and then sleeps.
Preferably, the power battery state information includes a voltage of each unit battery, a temperature of each unit battery, and an insulation resistance value of the power battery.
If the voltage drop rate of the single battery is larger than a preset first voltage drop rate threshold, or the temperature rise rate of the single battery is larger than a preset first temperature rise rate threshold, or the insulation resistance value drop rate of the power battery is larger than a preset first resistance value drop rate threshold, the power battery state is abnormal, or the power battery state is not abnormal.
Preferably, under the condition that the power battery state is not abnormal, if the voltage drop rate of the single battery is between a preset second voltage drop rate threshold and a preset first voltage drop rate threshold, or the temperature rise rate of the single battery is between a preset second temperature rise rate threshold and a preset first temperature rise rate threshold, or the insulation resistance value drop rate of the power battery is between a preset second resistance value drop rate threshold and a preset first resistance value drop rate threshold, when the whole vehicle stands still and starts to sleep after the monitoring is completed, the battery management system records the current power battery state information, keeps the sleep time unchanged, sends a sleep timing request and the unchanged sleep time to the vehicle networking system, and then sleeps.
Preferably, under the condition that the state of the power battery is not abnormal, if the voltage drop rate of the single battery is smaller than a preset second voltage drop rate threshold, the temperature rise rate of the single battery is smaller than a preset second temperature rise rate threshold, and the insulation resistance value drop rate of the power battery is smaller than a preset second resistance value drop rate threshold, when the whole vehicle stands still and starts to sleep after the monitoring is completed, the battery management system records the current state information of the power battery, prolongs the sleep time, sends a sleep timing request and the prolonged sleep time to the internet-of-vehicles system, and then sleeps.
The preset second voltage drop rate threshold is smaller than the preset first voltage drop rate threshold, the preset second temperature rise rate threshold is smaller than the preset first temperature rise rate threshold, and the preset second resistance value decrease rate threshold is smaller than the preset first resistance value decrease rate threshold.
Preferably, after the battery management system records the current power battery state information, the recorded power battery state information is sent to the Internet of vehicles system, and the Internet of vehicles system uploads the received power battery state information to the cloud.
The vehicle networking system is regarded as an alarm clock, has the functions of timing and self-awakening, and can be awakened to a whole vehicle control system when the timing reaches the timed awakening time through the interactive setting of the battery management system and the vehicle networking system, so that the battery management system is awakened to perform primary power battery monitoring; and the battery management system sets the next dormancy time according to the state information of the power battery after awakening and before dormancy, so that the aim of dynamically adjusting the timing time (namely the dormancy time) of the Internet of vehicles system according to the state of the power battery is fulfilled, and the state of the power battery is monitored more reasonably. When the power battery state is abnormal and needs to be observed, the next dormancy time is shortened, and the monitoring timeliness is ensured; when the power battery state is not abnormal and no key observation is needed, the timing awakening frequency can be reduced by prolonging the next dormancy time, so that the low-voltage power consumption of the whole vehicle system is reduced.
Drawings
Fig. 1 is a flowchart of a power battery monitoring method in this embodiment.
Detailed Description
As shown in fig. 1, the method for monitoring a power battery of a whole vehicle in a static state in this embodiment includes:
firstly, when the whole vehicle is placed still and starts to sleep, a battery management system (namely BMS) records the current state information of the power battery, determines the sleep time, sends a sleep timing request and the sleep time to a vehicle networking system (namely T-BOX), then sleeps, and then executes the second step. The power battery state information comprises the voltage of each single battery, the temperature of each single battery and the insulation resistance value of the power battery.
And secondly, after receiving the dormancy timing request and the dormancy time, the vehicle networking system sets a timing awakening time according to the dormancy time and starts timing, when the timing reaches the timing awakening time, the vehicle networking system awakens the whole vehicle control system, the whole vehicle control system awakens the battery management system, and then the third step is executed.
Thirdly, immediately recording the current power battery state information after the battery management system is awakened, comparing and analyzing the power battery state information recorded after the battery management system is awakened and the power battery state information recorded before dormancy, and then executing the fourth step;
fourthly, the battery management system judges whether the voltage drop rate of the single battery is larger than a preset first voltage drop rate threshold value, or the temperature rise rate of the single battery is larger than a preset first temperature rise rate threshold value, or the insulation resistance value drop rate of the power battery is larger than a preset first resistance value drop rate threshold value, namely whether the state of the power battery is abnormal is judged, if so, the fifth step is executed, otherwise, the sixth step is executed;
and fifthly, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current state information of the power battery, shortens the sleep time (compared with the previous sleep time, the sleep time is shortened), sends a sleep timing request and the shortened sleep time to the internet of vehicles, sleeps, and returns to execute the second step.
And sixthly, the battery management system judges whether the voltage reduction rate of the single battery is smaller than a preset second voltage reduction rate threshold, the temperature rise rate of the single battery is smaller than a preset second temperature rise rate threshold, the insulation resistance value reduction rate of the power battery is smaller than a preset second resistance value reduction rate threshold, if so, the seventh step is executed, and if not, the eighth step is executed. The preset second voltage drop rate threshold is smaller than the preset first voltage drop rate threshold, the preset second temperature rise rate threshold is smaller than the preset first temperature rise rate threshold, and the preset second resistance value decrease rate threshold is smaller than the preset first resistance value decrease rate threshold.
And seventhly, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current state information of the power battery, prolongs the sleep time (namely the sleep time is prolonged compared with the previous sleep time), sends a sleep timing request and the prolonged sleep time to the Internet of vehicles system, sleeps, and returns to execute the second step.
And eighthly, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current state information of the power battery, keeps the sleep time unchanged (namely the sleep time is equal to the sleep time of the previous time), sends a sleep timing request and the unchanged sleep time to the Internet of vehicles system, sleeps, and returns to execute the second step.
In addition, in this embodiment, after having recorded current power battery state information (including recording power battery state information before dormancy and record power battery state information after awakening up), the battery management system can send this power battery state information who records to the car networking system, and the car networking system can upload this power battery state information who receives to the high in the clouds.
Claims (4)
1. A power battery monitoring method in a standing state of a whole vehicle is characterized by comprising the following steps:
when the whole vehicle is placed still and starts to sleep, the battery management system records the current state information of the power battery, determines the sleep time, sends a sleep timing request and the sleep time to the vehicle networking system and then sleeps;
after receiving the sleep timing request and the sleep time, the Internet of vehicles system sets a timing wake-up time according to the sleep time and starts timing, and when the timing wake-up time is reached, the Internet of vehicles system wakes up the whole vehicle control system, and the whole vehicle control system wakes up the battery management system;
the battery management system immediately records the current power battery state information after awakening, and compares and analyzes the power battery state information recorded after awakening and the power battery state information recorded before dormancy:
if the power battery state is abnormal, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current power battery state information, shortens the sleep time, sends a sleep timing request and the shortened sleep time to the Internet of vehicles system and then sleeps;
if the power battery state is not abnormal, when the whole vehicle is kept still and starts to sleep after the monitoring is finished, the battery management system records the current power battery state information, keeps the sleep time unchanged or prolongs the sleep time, sends a sleep timing request and the unchanged sleep time or the prolonged sleep time to the Internet of vehicles system, and then sleeps.
2. The power battery monitoring method in the whole vehicle standing state according to claim 1, characterized in that: the power battery state information comprises the voltage of each single battery, the temperature of each single battery and the insulation resistance value of the power battery;
if the voltage drop rate of the single battery is larger than a preset first voltage drop rate threshold, or the temperature rise rate of the single battery is larger than a preset first temperature rise rate threshold, or the insulation resistance value drop rate of the power battery is larger than a preset first resistance value drop rate threshold, the power battery state is abnormal, or the power battery state is not abnormal.
3. The power battery monitoring method in the whole vehicle standing state according to claim 2, characterized in that:
under the condition that the power battery state is not abnormal, if the voltage drop rate of the single battery is between a preset second voltage drop rate threshold and a preset first voltage drop rate threshold, or the temperature rise rate of the single battery is between a preset second temperature rise rate threshold and a preset first temperature rise rate threshold, or the insulation resistance value drop rate of the power battery is between a preset second resistance value drop rate threshold and a preset first resistance value drop rate threshold, when the whole vehicle is kept still and starts to sleep after the monitoring is completed, the battery management system records the current power battery state information, keeps the sleep time unchanged, sends a sleep timing request and the unchanged sleep time to the vehicle networking system, and then sleeps;
under the condition that the state of the power battery is not abnormal, if the voltage drop rate of the single battery is smaller than a preset second voltage drop rate threshold, the temperature rise rate of the single battery is smaller than a preset second temperature rise rate threshold, and the insulation resistance value drop rate of the power battery is smaller than a preset second resistance value drop rate threshold, when the whole vehicle is kept still and starts to sleep after the monitoring is completed, the battery management system records the current state information of the power battery, prolongs the sleep time, sends a sleep timing request and the prolonged sleep time to the internet-of-vehicles system, and then sleeps;
the preset second voltage drop rate threshold is smaller than the preset first voltage drop rate threshold, the preset second temperature rise rate threshold is smaller than the preset first temperature rise rate threshold, and the preset second resistance value decrease rate threshold is smaller than the preset first resistance value decrease rate threshold.
4. The power battery monitoring method in the whole vehicle standing state according to any one of claims 1 to 3, wherein: after the battery management system records the current power battery state information, the recorded power battery state information is sent to the Internet of vehicles system, and the Internet of vehicles system uploads the received power battery state information to the cloud.
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| CN202111446436.XA CN113928179A (en) | 2021-11-30 | 2021-11-30 | Power battery monitoring method in whole vehicle standing state |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114844191A (en) * | 2022-04-21 | 2022-08-02 | 中国第一汽车股份有限公司 | Intelligent power supplementing method and device, storage medium and electronic device |
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