CN113799651B - Vehicle and battery system charging control method and device thereof - Google Patents
Vehicle and battery system charging control method and device thereof Download PDFInfo
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- CN113799651B CN113799651B CN202010537027.XA CN202010537027A CN113799651B CN 113799651 B CN113799651 B CN 113799651B CN 202010537027 A CN202010537027 A CN 202010537027A CN 113799651 B CN113799651 B CN 113799651B
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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]
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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
- 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
- B60L53/60—Monitoring or controlling charging stations
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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
- B60L58/24—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
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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
- 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
- Y02T90/12—Electric charging stations
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a vehicle and a battery system charging control method and device thereof, belonging to the technical field of new energy vehicle control. The invention adopts a charging control strategy of terminal current limiting, and the battery is charged with large current in the charging front section until the battery SOC reaches the SOC required by the user; and then charging with a small current until the SOC reaches 100% or the time of use is reached so that the temperature of the battery at the end of charging is not excessively high. Therefore, the charging process is divided into two nodes, so that the sudden demand of a user is considered, and the user demand can be met; meanwhile, the temperature after the battery is charged is considered, and a small-current charging mode is adopted at the charging tail end, so that the temperature of the battery at the end of charging is reduced, the service life of the battery is prolonged, and the time for starting a liquid cooling unit of the battery and the energy consumption of the whole vehicle during driving are also reduced.
Description
Technical Field
The invention relates to a vehicle and a battery system charging control method and device thereof, belonging to the technical field of new energy vehicle control.
Background
The lithium ion power battery is used as an important component of the electric vehicle, and the performance of the lithium ion power battery directly influences the normal use of the electric vehicle. With the improvement of the refund policy on the slope and the improvement of the endurance mileage, the energy density of the battery is required to be gradually improved, with the improvement of the energy density, the cycle performance and the multiplying power performance of the battery are correspondingly reduced, the heat productivity of the battery is improved to cause the improvement of the temperature rise of the battery, and the service life of the battery is influenced by the high temperature; the current mainstream thermal management for controlling battery temperature is liquid cooling. The highest temperature rise of the battery is in the charging stage, the charging multiplying power is large, and the heating quantity is high. At present, no good measure is adopted to solve the problem of the rise of the charging temperature. Therefore, developing a proper charging strategy is particularly important for the performance of the battery in the whole vehicle. Researchers at home and abroad are researching to continuously improve the charging efficiency and propose some charging strategies, including constant current charging, constant large current charging, constant current and constant voltage charging, a staged charging method and the like. The constant current charging and constant current and constant voltage charging method is low in cost, the system circuit structure is simple, the charging time is too long, and the charging efficiency is not high. Constant high-current charging methods and pulse charging solve the problem of excessively long charging time, but do not control the degree of charging well and have an adverse effect on battery life. The staged charging method has obvious advantages, and most of whole vehicle charging strategies also adopt similar methods. The above methods are all studied from the charging mechanism method.
The application publication number CN111106635a discloses a method and a device for determining a charging mode, and specifically discloses charging control according to a preset charging time of a client, if the preset charging time of the client is shorter, that is, the charging time of the quick charging mode is longer than the preset charging time of the client, the quick charging mode is adopted for charging, and when the charging time of the quick charging mode is shorter than the preset charging time of the client, the full charging mode is adopted for charging. According to the scheme, the charging quantity to be charged and the preset charging time are comprehensively considered, a faster charging mode can be provided for a user when the preset charging time required by the user is short, and a slower charging mode can be provided for the user as much as possible on the premise of meeting the requirement of the user when the preset charging time required by the user is long, so that the service life of the battery is guaranteed. However, the scheme does not consider the sudden demand of the user on one hand, and only controls the charging rate according to the reserved time of the user; on the other hand, the problem that the battery needs to be cooled firstly during driving because the temperature of the battery is relatively high due to the fast charging mode is not considered.
Disclosure of Invention
The invention aims to provide a vehicle and a battery system charging control method and device thereof, so as to solve the problem that the current charging control method does not consider sudden demands of users and battery temperature.
The invention provides a battery system charging control method for solving the technical problems, which comprises the following steps:
1) Acquiring a charging request signal, wherein the charging request signal comprises a battery initial SOC, a user-required SOC, a charging reservation starting time and a charging reservation departure time;
2) When the charging reservation starting time is reached, the battery system is charged in a quick charging mode until the SOC of the battery system reaches the SOC required by a user;
3) After the SOC of the battery system reaches the SOC required by the user, the battery system is charged according to a slow charging mode until the SOC of the battery system reaches a set cut-off condition, wherein the set cut-off condition is that the SOC of the battery system reaches 100% or the charging time reaches the user using time, and the charging current of a fast charging mode is larger than the charging current of a slow charging mode.
The present invention also provides a battery system charge control device including a processor and a memory, the processor executing a computer program stored by the memory to implement the battery system charge control method of the present invention as described above.
The invention also provides a vehicle comprising a battery system and a charge control device, the control device comprising a processor and a memory, the processor executing a computer program stored by the memory to implement the battery system charge control method as in the invention.
The invention adopts a charging control strategy of terminal current limiting, and the battery is charged with large current in the charging front section until the battery SOC reaches the SOC required by the user; and then charging with a small current until the SOC reaches 100% or the time of use is reached so that the temperature of the battery at the end of charging is not excessively high. Therefore, the charging process is divided into two nodes, so that the sudden demand of a user is considered, and the user demand can be met; meanwhile, the temperature after the battery is charged is considered, and a small-current charging mode is adopted at the charging tail end, so that the temperature of the battery at the end of charging is reduced, the service life of the battery is prolonged, and the time for starting a liquid cooling unit of the battery and the energy consumption of the whole vehicle during driving are also reduced.
Further, in order to increase the charging rate of the fast charging mode as much as possible, the charging current of the fast charging mode is the maximum allowable charging current.
Further, in order to meet various demands of customers, when the charging request signal does not include the charging reservation departure time, the battery system is charged in a fast charging manner.
Further, in order to improve the service life of the battery and save energy consumption, when the charging reservation starting time is at night and the time difference between the charging reservation starting time and the charging reservation departure time is greater than a set threshold, the battery system is charged in a full charge mode.
Further, the SOC required by the user is 80% -95%.
Drawings
FIG. 1 is a flow chart of a battery system charge control method of the present invention;
FIG. 2 is a schematic diagram showing a comparison of charging time of a fast charging mode and a charging control method according to the present invention;
FIG. 3 is a graph showing the comparison of the temperature trend of the battery in the fast charge mode and the charge end of the charge control method of the present invention;
fig. 4 is a block diagram showing the structure of a battery system charge control device according to the present invention.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings.
Method embodiment
The invention adopts a terminal current limiting charging control strategy, namely charging with the maximum allowable current in the charging front section until the battery SOC reaches the SOC required by the user; and then the battery is charged by small current until the SOC reaches 100% or the vehicle using time is reached, so that the temperature of the battery is not too high, and therefore, the invention not only can meet the sudden power demand of customers, but also can reduce the temperature of the battery, improve the service life of the battery, and simultaneously reduce the time for starting a battery liquid cooling unit and the energy consumption of the whole vehicle during driving. The specific implementation process of the method is shown in fig. 1, and the specific process is as follows:
1. and acquiring a charging request signal, and entering a corresponding charging mode according to the charging request signal.
The charging request signal in this embodiment generally includes the initial SOC of the battery, the SOC required by the user, the charging reservation start time, and the charging reservation departure time, and may also add new information according to the actual requirement of the user, for example, specify the charging mode. The charging request signal can be sent to the vehicle by the user through the mobile phone APP, and the vehicle enters a corresponding charging mode according to the received charging request signal.
The charging modes comprise a fast charging mode, a slow charging mode and a terminal current limiting mode, wherein the fast charging mode comprises the following steps of: charging with a maximum allowable charging current; slow charge mode: charging with a certain small current; terminal flow restriction mode: the charging front stage charges with the maximum allowable current until the battery SOC reaches the SOC required by the user; and then charged with a small current until the SOC reaches 100% or the on-time is reached. And when the charging mode is designated in the received charging request signal, charging according to the designated charging mode, otherwise, according to whether the charging request signal contains the charging reservation departure time and the time period of the charging reservation starting time.
2. And when the charging request signal contains the charging reservation departure time and the time period of the charging reservation starting time is not at night, charging according to the terminal current limiting mode.
The end current limit mode divides the charging phase into two phases, a first phase and a second phase. The first stage is a charging early stage, and the charging is carried out in the stage according to a quick charging mode until the SOC of the battery system reaches the electricity demand of a user, wherein the electricity demand is 80% -95%, and the specific value can be determined according to the actual condition of the vehicle and the actual demand of the user. In this embodiment, the user power consumption requirement is 90%, that is, the first stage refers to charging the battery system to 90% by using a fast charging mode, where the fast charging mode refers to a relatively large charging current, and the charging current adopted by the fast charging mode in this embodiment is the maximum allowable charging current, and the charging current of the fast charging mode may also be adjusted according to the actual requirement.
The second stage is the later stage of charging, and in the stage, the battery system is charged with small current according to a slow charging mode, and the specific current value is determined according to actual conditions. The charge cut-off condition of the stage is that the SOC of the battery system reaches 100% or the charge time reaches the user use time, and when the user use time reaches, even if the SOC does not reach 100%, the charge is stopped immediately, because the user power demand is already reached in the first stage, and the normal use of the user is not influenced by the SOC without 100%, so that various burst demands of the user can be met. Meanwhile, as the battery is charged by the small current adopted in the stage, the temperature rise brought by the battery is small, the temperature of the battery can be reduced when the corresponding travelling crane and the battery are kept still, the time for starting the liquid cooling system of the travelling crane battery can be reduced when the temperature is reduced, the energy consumption of the whole vehicle is reduced, the storage temperature of the battery can be reduced when the battery is kept still and the storage attenuation of the battery is reduced.
For business vehicles, customers generally carry out full charge at night, the charging time period has no influence on the operation of the customers, the charging current is properly reduced in the charging stage, the temperature of a battery at the end of charging can be reduced, and if the temperature rise of the battery can be controlled in the charging stage, the temperature of the battery can be reduced during corresponding driving and standing. Therefore, when the charge reservation start time in the charge request signal is at night, the night generally means 21 points or later, and the time between the charge reservation start time and the charge reservation departure time is greater than the set time threshold, the battery system is charged by adopting the slow charge mode, and the set time threshold is selected according to practical situations, and is generally 6 hours.
When the charging reservation departure time in the charging request signal is not available, the battery system is defaulted to a fast charging mode, namely, the battery system is charged according to the fast charging mode.
The charge time of the end current limit mode versus the slow charge mode and the fast charge mode pair such as shown in figure 2, the battery temperature for the end current limit mode versus time for the slow charge mode and the fast charge mode is shown in fig. 3. From the above, the terminal current limiting mode adopted by the invention not only considers the charging time, meets the sudden demand of the charging clients, but also considers the battery temperature at the end of charging.
The charging control process thereof is described below with respect to a specific example. When the vehicle receives a charging request signal including battery initial soc=20%, battery initial temperature 25 ℃, charging rate 1C of maximum allowable charging of the charging pile, charging start time is 12:00, customer reserved departure time is 14:00, allowable charging duration is 120min, and operation requirements (user electricity demand) can be met by charging the customer to 85% SOC. If charging is performed according to the conventional strategy (quick charging mode), the time required for charging 1C to soc=100% is 50min, the temperature of the battery after charging is raised to about 20 ℃, and the temperature after charging is about 45 ℃; the battery temperature is high when the vehicle starts, affecting the battery life. According to the invention, the charging is carried out to the SOC=85% according to the 1C before the charging, the operation requirement of a customer is met, the charging time is about 39min, the normal use of the customer is not influenced if the customer needs to start in a temporary emergency, and the battery temperature in the quick charging stage is raised to about 37 ℃. The current reduction charging is carried out on the electric quantity of 15% later, the charging multiplying power is reduced to 0.15C, the charging time is 70min when the charging multiplying power is reduced to 0.15C and the charging is carried out until the SOC=100%, the temperature reduction of the battery in the current limiting charging stage is about 7 ℃, and the charging ending temperature is about 30 ℃. Therefore, through the terminal current limiting strategy, the requirements of customers can be met, the temperature of the battery can be reduced, the service life of the battery can be prolonged, the time for starting the liquid cooling battery liquid cooling unit during driving is reduced, and the energy consumption of the whole vehicle is reduced.
Device embodiment
The apparatus proposed in this embodiment, as shown in fig. 4, includes a processor and a memory, where the memory stores a computer program that can be executed on the processor, and the processor implements the method of the foregoing method embodiment when executing the computer program.
That is, the method in the above method embodiments should be understood that the flow of the liquid-cooled battery system charge control method may be implemented by computer program instructions. These computer program instructions may be provided to a processor such that execution of the instructions by the processor results in the implementation of the functions specified in the method flow described above.
The processor in this embodiment refers to a microprocessor MCU or a processing device such as a programmable logic device FPGA;
the memory referred to in this embodiment includes physical means for storing information, typically by digitizing the information and then storing the information in an electrical, magnetic, or optical medium. For example: various memories, RAM, ROM and the like for storing information by utilizing an electric energy mode; various memories for storing information by utilizing a magnetic energy mode, such as a hard disk, a floppy disk, a magnetic tape, a magnetic core memory, a bubble memory and a U disk; various memories, CDs or DVDs, which store information optically. Of course, there are other ways of storing, such as quantum storing, graphene storing, etc.
The device formed by the memory, the processor and the computer program is implemented in the computer by executing corresponding program instructions by the processor, and the processor can be loaded with various operating systems, such as windows operating systems, linux systems, android, iOS systems and the like.
As other embodiments, the device may also include a display for presenting the diagnostic results for reference by the staff.
Vehicle embodiment
The vehicle of the embodiment comprises a battery system and a battery system charging control device, wherein the charging control device adopts the charging control device in the embodiment of the device, and a processor can directly adopt a whole vehicle controller or can be a charging controller which is independently arranged and is connected with a battery management system.
The invention can determine a reasonable battery charging strategy according to the actual charging requirement of a customer and battery state information (temperature, SOC, and the like), so that the battery is at a proper temperature, the influence on the battery charging time is reduced, the cycle performance of the battery is ensured, the influence of high-temperature storage on the attenuation of the battery is reduced, the service life of the battery is prolonged, the temperature of the driving battery is reduced, the starting time of a battery cooling owner is reduced, and the energy consumption of the whole vehicle is reduced.
Claims (7)
1. A battery system charge control method, characterized in that the charge control method comprises the steps of:
1) Acquiring a charging request signal, wherein the charging request signal comprises a battery initial SOC, a user-required SOC, a charging reservation starting time and a charging reservation departure time;
2) When the charging reservation starting time is reached, the battery system is charged in a quick charging mode until the SOC of the battery system reaches the SOC required by a user;
3) After the SOC of the battery system reaches the SOC required by the user, the battery system is charged according to a slow charging mode until the SOC of the battery system reaches a set cut-off condition, wherein the set cut-off condition is that the SOC of the battery system reaches 100% or the charging time reaches the user using time, and the charging current of a fast charging mode is larger than the charging current of a slow charging mode.
2. The battery system charge control method according to claim 1, wherein the charge current of the fast charge mode is a maximum allowable charge current.
3. The battery system charge control method according to claim 1, wherein the battery system is charged in a quick charge manner when the charge reservation departure time is not included in the charge request signal.
4. The battery system charge control method according to claim 1, wherein when the charge reservation start time is evening and a time difference between the charge reservation start time and the charge reservation departure time is greater than a set threshold, the battery system is charged in a full charge manner.
5. The battery system charge control method according to any one of claims 1 to 4, wherein the SOC required by the user is 80% -95%.
6. A battery system charge control device comprising a processor and a memory, the processor executing a computer program stored by the memory to implement the battery system charge control method of any one of claims 1-5.
7. A vehicle comprising a battery system and a charge control device, characterized in that the control device comprises a processor and a memory, the processor executing a computer program stored by the memory to implement the battery system charge control method according to any one of the preceding claims 1-5.
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| CN202010537027.XA CN113799651B (en) | 2020-06-12 | 2020-06-12 | Vehicle and battery system charging control method and device thereof |
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| CN202010537027.XA CN113799651B (en) | 2020-06-12 | 2020-06-12 | Vehicle and battery system charging control method and device thereof |
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| CN114407728B (en) * | 2022-02-28 | 2023-05-02 | 重庆长安新能源汽车科技有限公司 | Vehicle power battery charging control method, system, automobile and computer readable storage medium |
| CN116207828B (en) * | 2023-04-25 | 2023-10-03 | 荣耀终端有限公司 | Charging method and electronic equipment |
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