CN113071370B - Management method of low-voltage lithium battery of electric automobile and complete automobile power supply switching method - Google Patents

Management method of low-voltage lithium battery of electric automobile and complete automobile power supply switching method Download PDF

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CN113071370B
CN113071370B CN202110313997.6A CN202110313997A CN113071370B CN 113071370 B CN113071370 B CN 113071370B CN 202110313997 A CN202110313997 A CN 202110313997A CN 113071370 B CN113071370 B CN 113071370B
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low
lithium battery
voltage
voltage lithium
battery
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CN113071370A (en
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王忠民
肖江
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Hozon New Energy Automobile Co Ltd
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Hozon New Energy Automobile Co Ltd
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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
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • 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
    • 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
    • B60L58/27—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 by heating
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/547—Voltage
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

Abstract

The invention discloses a management method of a low-voltage lithium battery of an electric automobile, which comprises the following steps: s1, judging whether the IBS of the battery sensor is awakened or not, if so, executing a step S3; if not, executing the step S2; s2, judging whether the preset timing awakening time is up, if so, executing the step S3; s3, acquiring data information which is monitored by a battery sensor IBS and related to the low-voltage lithium battery, judging whether the acquired data information related to the low-voltage lithium battery is normal or not, and if so, not processing; if not, executing the step S4; and S4, sending the abnormal information to the VCU of the vehicle control unit, and carrying out corresponding processing. The invention realizes the monitoring and protection of the low-voltage lithium battery of the vehicle by using the low-voltage lithium battery protection board, and ensures the safety and reliability of the lithium battery in the working process. And the lithium battery can not have the undervoltage problem caused by long-term standing through the timing monitoring and intelligent power-on functions.

Description

Management method of low-voltage lithium battery of electric automobile and complete automobile power supply switching method
Technical Field
The invention relates to the technical field of new energy automobile battery management, in particular to a management method of a low-voltage lithium battery of an electric automobile and a whole automobile power supply switching method.
Background
At present, most of new energy pure electric vehicles use traditional lead-acid batteries to provide starting and low-voltage power supply for the whole vehicle.
The energy density of the lead-acid battery is lower, under the condition of the same capacity, the weight of the lead-acid battery is 3 to 5 times that of the lithium battery, and the volume of the lithium battery is 30 percent smaller than that of the storage battery. The service life of the lithium battery is about 3-6 times of that of the lead-acid battery. For the lithium battery and the storage battery which are charged completely at the same temperature, the discharge current with different multiplying powers is adopted, the discharge output characteristic of the lithium battery is very stable, and the discharge output characteristic of the storage battery is greatly different, so that the power instability is caused. And the lead-acid battery is internally provided with no monitoring and protecting circuit, so that the condition of insufficient voltage of the storage battery often occurs.
In view of the above technical problems, improvement is needed.
Disclosure of Invention
The invention aims to provide a management method of a low-voltage lithium battery of an electric automobile and a complete automobile power supply switching method aiming at the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a management method of a low-voltage lithium battery of an electric vehicle comprises the following steps:
s1, judging whether a battery sensor IBS is awakened or not, if yes, executing a step S3; if not, executing the step S2;
s2, judging whether the preset timing awakening time is up, if so, executing the step S3;
s3, acquiring data information which is monitored by a battery sensor IBS and related to the low-voltage lithium battery, judging whether the acquired data information related to the low-voltage lithium battery is normal or not, and if so, not processing; if not, executing the step S4;
and S4, sending the abnormal information to the VCU of the vehicle control unit, and carrying out corresponding processing.
Further, the data information related to the low-voltage lithium battery monitored by the battery sensor IBS in step S3 specifically includes the cell voltage, the temperature, and the SOC of the low-voltage lithium battery.
Further, the corresponding processing in step S4 includes that if it is monitored that the cell voltage is too low, the battery sensor IBS wakes up the entire vehicle through the CAN network, and requests the entire vehicle controller VCU to start the DCDC to charge the low-voltage lithium battery.
Further, the corresponding processing in step S4 includes that if the monitored temperature of the low-voltage lithium battery is too low, the battery sensor IBS controls the PTC heating switch in the low-voltage lithium battery to be turned on, and the PTC heating is performed through the DCDC.
Further, the corresponding processing in the step S4 includes starting the DCDC to charge the low-voltage lithium battery at a constant current if the monitored SOC of the low-voltage lithium battery is smaller than a first preset threshold.
Correspondingly, a method for switching the low-voltage power supply of the whole vehicle is also provided, and the method comprises the following steps:
s1, loading a working mode of a whole vehicle;
s2, judging whether the loaded working mode is a long endurance mode, if so, executing the step S3; if not, executing the step S5;
s3, closing the output of the DCDC, and providing low-voltage electric energy for the whole vehicle by adopting a low-voltage lithium battery;
s4, judging whether the SOC of the low-voltage lithium battery is larger than a second preset threshold value or not, if so, continuing to execute the step S3; if not, executing the step S5;
and S5, starting the output of the DCDC, providing low-voltage electric energy for the whole vehicle by adopting the DCDC, and switching the running working mode into a long-life mode.
Further, the extendable mileage estimation formula in the long endurance mode in step S2 is expressed as:
Figure 100002_DEST_PATH_IMAGE002
wherein A represents the electric quantity of the low-voltage lithium battery; d% represents the discharge depth of the low-voltage lithium battery;ηrepresents a hundred kilometers of energy consumption; s represents an extendable mileage.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention realizes the monitoring and protection of the low-voltage lithium battery of the vehicle by using the low-voltage lithium battery protection board, and ensures the safety and reliability of the lithium battery in the working process.
2. The lithium battery can not have the undervoltage problem caused by long-term standing through the timing monitoring and intelligent power-on functions.
3. The IBS can detect the voltage of the battery monomer in real time, has the functions of overvoltage and undervoltage classification alarm, and sends the monomer voltage information and the fault alarm information to the VCU in real time; and IBS can realize the function of graded alarm of temperature, SOC and current, and upload relevant data in real time.
4. The IBS can adjust the output voltage of the DCDC of the whole vehicle, and ensure that the charging current meets the design requirement of the battery cell;
5. in the driving process, the DCDC is disconnected, and the low-voltage lithium battery is used for providing low-voltage power supply for the whole vehicle, so that the consumption of a power battery is reduced, and the endurance mileage of the whole vehicle is improved.
6. IBS manages the low-voltage lithium battery to work in an ideal engineering environment, and compared with the traditional storage battery, the service life of the low-voltage power supply battery of the whole vehicle is prolonged.
7. The low-voltage lithium battery with the IBS management function has the advantages of small size, light weight and the like, reduces the weight of the whole vehicle, and improves the endurance of the whole vehicle.
Drawings
Fig. 1 is a flowchart of a management method for a low-voltage lithium battery of an electric vehicle according to an embodiment;
fig. 2 is a flowchart of a method for switching a low-voltage power supply of a finished vehicle according to the second embodiment.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention aims to provide a management method of a low-voltage lithium battery of an electric automobile and a complete automobile power supply switching method aiming at the defects of the prior art.
Example one
The embodiment provides a management method of a low-voltage lithium battery of an electric vehicle, as shown in fig. 1, including the steps of:
s1, judging whether the IBS of the battery sensor is awakened or not, if so, executing a step S3; if not, executing the step S2;
s2, judging whether the preset timing awakening time is up, if so, executing a step S3;
s3, acquiring data information which is monitored by a battery sensor IBS and related to the low-voltage lithium battery, judging whether the acquired data information related to the low-voltage lithium battery is normal or not, and if so, not processing; if not, executing the step S4;
and S4, sending the abnormal information to a VCU of the vehicle control unit, and carrying out corresponding processing.
The embodiment provides a low-voltage lithium battery management system for replacing a traditional lead-acid starting battery. The low-voltage lithium battery is a power type battery, the low-voltage lithium battery management system can monitor basic information such as temperature, monomer voltage and charging and discharging current of the lithium battery in real time, the running state of the lithium battery is determined through battery state of charge (SOC) evaluation, and battery health (SOH) is evaluated.
The low-voltage lithium battery comprises the following components: a lithium battery structural case, a battery management system BMS, a current sensor, a temperature sensor, a battery heating PTC, a wire harness, a connector, and the like. Wherein, the low pressure lithium cell adopts 1P4S lithium iron phosphate core, output voltage scope: 10V to 14.8V; the low-voltage lithium battery is adopted to replace the lead-acid storage battery of the original whole vehicle to provide a low-voltage power supply for the whole vehicle, and the low-voltage power-on function of the whole vehicle is supported within the full temperature range.
A battery protection board in the low-voltage lithium battery has the function of controlling a charging switch, a discharging switch and a PTC heating switch, and the discharging control of the battery protection board is a normally closed switch. The charging switch and the PTC heating switch are normally open switches. Namely, before the whole vehicle is not dormant or electrified, the low-voltage lithium battery continuously provides a low-voltage power supply for the whole vehicle.
In this embodiment, the IBS can independently control the charge switch and the discharge switch. The discharging switch is a normally closed switch, and the charging switch is a normally open switch.
In step S1, it is determined whether the battery sensor IBS is woken up, if so, step S3 is performed; if not, executing the step S2;
the battery sensor IBS is awakened in two ways, one is that the vehicle is awakened (including key awakening and charging awakening), and the IBS is also awakened at the same time; the other method is that after the whole vehicle is powered down at a low voltage, a timing awakening time interval is set through a mobile phone APP, and when the timing awakening time is reached, the IBS is awakened.
If the current voltage is low, the IBS is waken based on the wake-up time interval, and step S2 is performed.
In step S2, it is determined whether a preset timed wakeup time is reached, and if so, step S3 is performed.
And when the vehicle is in low voltage, if the current IBS is not awakened, further judging whether the awakening time interval arrives, if not, continuing to wait, and if so, executing the step S3.
It should be noted that the wakeup time in this embodiment may be set by the APP, and if not, a default timing wakeup time, such as 30 minutes, is adopted.
In step S3, data information related to the low-voltage lithium battery monitored by the battery sensor IBS is acquired, and whether the acquired data information related to the low-voltage lithium battery is normal is determined, and if yes, no processing is performed; if not, step S4 is executed.
In step S4, the abnormal information is sent to the vehicle control unit VCU, and corresponding processing is performed.
The data information related to the low-voltage lithium battery specifically includes the cell voltage, the temperature, the SOC and the like of the low-voltage lithium battery.
If the awakening of the current IBS is after the awakening through the vehicle:
and when the IBS is awakened, the IBS is powered on at the moment, and the data of the cell voltage, the temperature, the SOC, the current and the like of the battery are monitored in real time.
When the IBS detects that serious faults such as thermal runaway, over-temperature, over-current, over-voltage, under-voltage and SOC abnormity occur in the low-voltage lithium battery, a corresponding fault code is sent to the VCU, meanwhile, the main relay is required to be disconnected, the 12V lithium battery enters a fault mode, and the fault mode is cleared after power is turned off.
If the current is in the low-voltage power-down state of the whole vehicle:
and after the timing awakening time of the IBS is up, the IBS is awakened, and key parameters such as the cell voltage, the temperature, the SOC and the like of the battery are monitored. And if the abnormality is not found, the IBS enters a sleep mode and waits for timing awakening or low-voltage power-on of the whole vehicle again. If the monitored voltage or temperature of the single body is too low, the IBS awakens the whole vehicle through the CAN network and requests the VCU to start the DCDC to charge the lithium battery; if the monitored temperature is too low, the IBS controls the PTC heating switch to be closed, and the PTC is heated through the DCDC; and if the monitored SOC of the low-voltage lithium battery is smaller than a set initial value, starting the DCDC to charge the low-voltage lithium battery at constant current, and the low-voltage lithium battery management system regulates charging current by requesting the DCDC to output a voltage value, so that the safety of the charging process is ensured.
In the embodiment, the IBS monitors information such as the cell voltage, the temperature and the SOC of the low-voltage lithium battery, and when any information is detected to be abnormal, corresponding information and fault alarm information are sent to the VCU in real time, so that the safety and the reliability of the low-voltage lithium battery in the working process are ensured.
Compared with the prior art, the embodiment has the following beneficial effects:
1. the low-voltage lithium battery protection board is used for monitoring and protecting the low-voltage lithium battery of the vehicle, and the safety and the reliability of the lithium battery in the working process are ensured.
2. The lithium battery is ensured not to have the undervoltage problem caused by long-term standing through the timing monitoring and intelligent power-on functions.
3. The IBS can detect the voltage of the battery monomer in real time, has the functions of overvoltage and undervoltage classification alarm, and sends the monomer voltage information and the fault alarm information to the VCU in real time; in the same way, the IBS can realize the function of graded alarm of temperature, SOC and current and upload related data in real time.
4. IBS can adjust the output voltage of the DCDC of the whole vehicle, and ensure that the charging current meets the design requirement of the battery core;
5. IBS manages the low-voltage lithium battery to work in an ideal engineering environment, and compared with the traditional storage battery, the service life of the low-voltage power supply battery of the whole vehicle is prolonged.
6. The low-voltage lithium battery with the IBS management function has the advantages of small size, light weight and the like, reduces the weight of the whole vehicle, and improves the endurance of the whole vehicle.
Example two
The embodiment provides a method for switching a low-voltage power supply of a whole vehicle, which is based on the management method of a low-voltage lithium battery of an electric vehicle in the first embodiment, and as shown in fig. 2, the method includes the following steps:
A1. loading the working mode of the whole vehicle running;
A2. judging whether the loaded working mode is a long endurance mode, if so, executing the step A3; if not, executing the step A5;
A3. the output of the DCDC is closed, and a low-voltage lithium battery is adopted to provide low-voltage electric energy for the whole vehicle;
A4. judging whether the SOC of the low-voltage lithium battery is greater than a second preset threshold value or not, if so, continuing to execute the step A3; if not, executing the step A5;
A5. and starting the output of the DCDC, providing low-voltage electric energy for the whole vehicle by adopting the DCDC, and switching the running working mode into a long-life mode.
In this embodiment, carry on the vehicle of low pressure lithium cell, can the exclusive use lithium cell provide the power supply for putting in order car low-voltage apparatus in the driving process, also can use DCDC to provide the low pressure power supply for putting in order the car. And DCDC is generally used by new energy automobiles at present to provide low-voltage power supply for the whole automobiles. Besides being used during starting, the low-voltage storage battery mainly aims to provide low-voltage power supply for the whole vehicle after the whole vehicle is powered off. Therefore, the embodiment provides a method for providing personalized driving modes (including a long-endurance mode and a long-life mode) according to the needs of users.
The specific implementation mode of the switching method of the low-voltage power supply of the whole vehicle is as follows:
the user can set up driving mode through APP, if the user does not set up, then use acquiescent mode, like long-life mode.
After the system loads the running mode of the whole vehicle, whether the loaded mode is the long endurance mode is judged, if the current working mode is not the long endurance mode, namely the current working mode is the long service life mode, the DCDC output is enabled, and the DCDC is adopted to provide low-voltage electric energy for low-voltage equipment of the whole vehicle.
If the current working mode is the long endurance mode, the DCDC is closed, and a low-voltage lithium battery is adopted to provide low-voltage electric energy for low-voltage equipment of the whole vehicle; whether the SOC of the low-voltage lithium battery is larger than a second preset threshold value (such as 20%) is further judged, if so, the low-voltage lithium battery is continuously used for providing low-voltage electric energy for low-voltage equipment of the whole vehicle, if not, the DCDC is adopted for providing the low-voltage electric energy for the low-voltage equipment of the whole vehicle, at the moment, after the DCDC is enabled to output, the DCDC can also charge the low-voltage lithium battery, and at the moment, the driving mode is switched to the long-life mode.
In this embodiment, the driving range can be extended by using the long endurance mode, and a specific extendable range estimation formula is expressed as:
Figure DEST_PATH_IMAGE004
wherein A represents the electric quantity of the low-voltage lithium battery; d% represents the depth of discharge (battery capacity discharged as a percentage of rated capacity) of the low voltage lithium battery;ηrepresents a hundred kilometers energy consumption; s represents an extendable mileage.
Assuming that the capacity of the low-voltage lithium battery is A =2kWh, the discharge depth D =80, and the hundred kilometer energy consumption eta =12.5kWh/100km, the extendable mileage is calculated as:
Figure DEST_PATH_IMAGE006
compared with the prior art, the embodiment has the following beneficial effects:
1. in the driving process, the DCDC is disconnected, and the low-voltage lithium battery is used for providing low-voltage power supply for the whole vehicle, so that the consumption of a power battery is reduced, and the endurance mileage of the whole vehicle is improved.
2. IBS manages the low-voltage lithium battery to work in an ideal engineering environment, and compared with the traditional storage battery, the service life of the low-voltage power supply battery of the whole vehicle is prolonged.
3. The low-voltage lithium battery with the IBS management function has the advantages of small size, light weight and the like, reduces the weight of the whole vehicle, and improves the endurance of the whole vehicle.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.

Claims (6)

1. A whole vehicle low-voltage power supply switching method based on a management method of a low-voltage lithium battery of an electric vehicle is characterized by comprising the following steps:
A1. loading the working mode of the whole vehicle running;
A2. judging whether the loaded working mode is a long endurance mode or not, if so, executing the step A3; if not, executing the step A5;
A3. the output of the DCDC is closed, and a low-voltage lithium battery is adopted to provide low-voltage electric energy for the whole vehicle;
A4. judging whether the SOC of the low-voltage lithium battery is greater than a second preset threshold value or not, if so, continuing to execute the step A3; if not, executing the step A5;
A5. the output of the DCDC is started, the DCDC is adopted to provide low-voltage electric energy for the whole vehicle, and the running mode is switched to a long-life mode;
the management method of the low-voltage lithium battery of the electric automobile comprises the following steps:
s1, judging whether the IBS of the battery sensor is awakened or not, if so, executing a step S3; if not, executing the step S2;
s2, judging whether the preset timing awakening time is up, if so, executing the step S3;
s3, acquiring data information related to the low-voltage lithium battery monitored by a battery sensor IBS, judging whether the acquired data information related to the low-voltage lithium battery is normal or not, and if so, not processing; if not, executing the step S4;
and S4, sending the abnormal information to a VCU of the vehicle control unit, and carrying out corresponding processing.
2. The method according to claim 1, wherein the data information related to the low voltage lithium battery monitored by the battery sensor IBS in step S3 specifically includes cell voltage, temperature, and SOC of the low voltage lithium battery.
3. The method according to claim 2, wherein the corresponding processing in step S4 includes that if it is detected that the cell voltage is too low, the battery sensor IBS wakes up the vehicle through the CAN network and requests the vehicle control unit VCU to turn on the DCDC to charge the low-voltage lithium battery.
4. The method of claim 2, wherein the corresponding processing in step S4 includes that if the temperature of the low-voltage lithium battery is detected to be too low, the battery sensor IBS controls a PTC heating switch in the low-voltage lithium battery to be closed and the PTC is heated by DCDC.
5. The method according to claim 2, wherein the corresponding processing in step S4 includes starting DCDC to charge the low-voltage lithium battery with constant current if the SOC of the low-voltage lithium battery is monitored to be less than a first preset threshold.
6. The switching method of the low-voltage power supply of the whole vehicle according to claim 1, wherein the extendable mileage estimation formula in the long endurance mode in the step A2 is represented as:
Figure DEST_PATH_IMAGE002
wherein A represents the electric quantity of the low-voltage lithium battery; d% represents the discharge depth of the low-voltage lithium battery;ηrepresents a hundred kilometers energy consumption; s represents an extendable mileage.
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