CN112265448A - A dual-battery power supply system for an electric vehicle and its control method - Google Patents
A dual-battery power supply system for an electric vehicle and its control method Download PDFInfo
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- CN112265448A CN112265448A CN202011229443.XA CN202011229443A CN112265448A CN 112265448 A CN112265448 A CN 112265448A CN 202011229443 A CN202011229443 A CN 202011229443A CN 112265448 A CN112265448 A CN 112265448A
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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
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- 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
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
本发明实施例公开了一种电动车双电池供电系统及其控制方法，该双电池供电系统包括：电连接的第一电池组件和第二电池组件，第一电池组件包括电连接的第一电池管理系统和第一电池，第二电池组件包括电连接的第二电池管理系统和第二电池；第一电池管理系统用于采集第一电池的电气参数；第二电池管理系统用于采集第二电池的电气参数，并根据第一电池和第二电池的电气参数，切换为单电池供电模式或者双电池供电模式。本发明实施例可对整车提供最大的电源供电功率与系统供电的备份，提高续航里程的同时可提高行车的安全性和稳定性，提高用户的骑行体验。此外，双电池供电系统减小了单个电池组件的体积，携带方便。
The embodiment of the present invention discloses a dual-battery power supply system for an electric vehicle and a control method thereof. The dual-battery power supply system includes: a first battery assembly and a second battery assembly that are electrically connected, and the first battery assembly includes a first battery that is electrically connected A management system and a first battery, the second battery assembly includes a second battery management system and a second battery that are electrically connected; the first battery management system is used to collect electrical parameters of the first battery; the second battery management system is used to collect the second battery The electrical parameters of the battery are switched to the single battery power supply mode or the dual battery power supply mode according to the electrical parameters of the first battery and the second battery. The embodiment of the present invention can provide the maximum power supply power and backup of the system power supply for the whole vehicle, and can improve the safety and stability of driving while improving the cruising range, and improve the riding experience of the user. In addition, the dual-battery power supply system reduces the volume of a single battery assembly and is easy to carry.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery control, in particular to a double-battery power supply system of an electric vehicle and a control method thereof.
Background
With the progress of science and technology and the development of society, the electric vehicle is popular among people as a new energy green product. An electric vehicle is a vehicle using a storage battery as an energy source, and the storage battery is one of the most important components of the electric vehicle.
With the continuous increase of the continuous mileage and motor power requirements of the market and the user population, the single cell system cannot meet the requirements. The existing electric vehicle single battery system has the problem of short endurance, and is easy to cause mileage anxiety of a user and bring poor riding experience. Because only one battery supplies power, the battery is not replaced when the power supply battery breaks down, and the safety and the stability of driving are influenced. In addition, in order to prolong the endurance mileage, the single battery is large in size and inconvenient to carry.
Disclosure of Invention
The embodiment of the invention provides a double-battery power supply system of an electric vehicle and a control method thereof, which aim to solve the problems of short endurance, no replacement battery and inconvenience in carrying of a single battery system.
The embodiment of the invention provides a double-battery power supply system of an electric vehicle, which comprises: the battery pack comprises a first battery pack and a second battery pack which are electrically connected, wherein the first battery pack comprises a first battery management system and a first battery which are electrically connected, and the second battery pack comprises a second battery management system and a second battery which are electrically connected;
the first battery management system is used for acquiring electrical parameters of the first battery;
the second battery management system is used for acquiring the electrical parameters of the second battery, acquiring the electrical parameters of the first battery through the first battery management system, and switching to a target power supply mode according to the electrical parameters of the first battery and the electrical parameters of the second battery, wherein the target power supply mode is a single battery power supply mode or a double battery power supply mode.
Further, the electrical parameter comprises at least a supply voltage;
the second battery management system is used for judging that the open-circuit voltages of the first battery and the second battery are consistent when detecting that the power supply voltages of the first battery and the second battery are consistent, and switching to the dual-battery power supply mode, or judging that the open-circuit voltages of the first battery and the second battery are inconsistent when detecting that the power supply voltages of the first battery and the second battery are inconsistent, and switching to the single-battery power supply mode.
Further, the electrical parameter further comprises a discharge current;
the second battery management system is used for judging that the open-circuit voltages of the first battery and the second battery are consistent when detecting that the discharge current proportion difference value of the first battery and the second battery is within a preset range, or judging that the open-circuit voltages of the first battery and the second battery are inconsistent when detecting that the discharge current proportion difference value of the first battery and the second battery exceeds the preset range.
Further, the battery assembly includes a discharge circuit and a charge circuit;
the second battery management system is used for controlling the discharging loop and the charging loop of each battery assembly to be opened when the dual-battery power supply mode is switched to, so that the dual batteries are supplied with power in parallel;
and the second battery management system is used for controlling the discharging loop and the charging loop of the target battery assembly to be opened and the discharging loop and the charging loop of the other battery assembly to be closed when the single battery power supply mode is switched to, so as to supply power to the single battery.
Further, the electrical parameter comprises an amount of electricity;
the electric quantity of the target battery pack is greater than that of the other open-circuit state battery pack.
Further, after the second battery management system is switched to the single battery power supply mode, if it is detected that the electric quantity of the battery assembly in the power supply state is lower than the electric quantity of the battery assembly in the open circuit state, or it is detected that the battery assembly in the power supply state is out of order, the second battery management system controls to open a discharge loop of the battery assembly in the open circuit state, then close the discharge loop and a charge loop of the battery assembly in the power supply state, and finally open a charge loop of the battery assembly in the open circuit state.
Further, the second battery management system is used for switching on the power supply output path of another battery assembly and switching off the power supply output path of the fault battery when detecting that any one battery assembly has a fault.
Further, the electric vehicle dual-battery power supply system further comprises: when the electric vehicle is powered on, the second battery management system is used for controlling the second battery to be powered on for the electric vehicle and awakening the first battery assembly; or, when the electric vehicle is powered on, the second battery management system is used for controlling the first battery to power on the electric vehicle when the second battery is judged to be in a low-power state.
Further, the electric vehicle dual-battery power supply system further comprises: after the power supply is finished, the second battery management system sends power supply limiting power and the electrical parameters to the whole vehicle system according to the target power supply mode of the double-battery power supply system, and the whole vehicle system adjusts the power utilization condition of the whole vehicle according to the electrical parameters.
Based on the same inventive concept, an embodiment of the present invention further provides a control method of the electric vehicle dual-battery power supply system, where the electric vehicle dual-battery power supply system includes: the battery pack comprises a first battery pack and a second battery pack which are electrically connected, wherein the first battery pack comprises a first battery management system and a first battery which are electrically connected, and the second battery pack comprises a second battery management system and a second battery which are electrically connected;
the control method comprises the following steps:
the first battery management system collects electrical parameters of the first battery;
the second battery management system collects electrical parameters of the second battery, acquires the electrical parameters of the first battery through the first battery management system, and switches to a target power supply mode according to the electrical parameters of the first battery and the electrical parameters of the second battery, wherein the target power supply mode is a single battery power supply mode or a double battery power supply mode.
The electric vehicle double-battery power supply system comprises a first battery assembly and a second battery assembly which are electrically connected, wherein the first battery assembly comprises a first battery management system and a first battery which are electrically connected, and the second battery assembly comprises a second battery management system and a second battery which are electrically connected; the method comprises the steps of acquiring electrical parameters of a first battery and electrical parameters of a second battery through a first battery management system and a second battery management system respectively, acquiring the electrical parameters of the first battery through the first battery management system by using the second battery management system, and switching to a single battery power supply mode or a target power supply mode of a double battery power supply mode according to the electrical parameters of the first battery and the second battery. According to the electric vehicle double-battery power supply system provided by the embodiment of the invention, the target power supply mode can be automatically switched according to the electrical parameters of the battery assembly, the maximum power supply power and the backup of system power supply are provided for the whole vehicle, the driving safety and stability can be improved while the endurance mileage is improved, and the riding experience of a user is improved. In addition, the double-battery power supply system splits one battery pack into two battery components, so that the size of a single battery component is reduced, and the double-battery power supply system is convenient to carry.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description, although being some specific embodiments of the present invention, can be extended and extended to other structures and drawings by those skilled in the art according to the basic concepts of the device structure, the driving method and the manufacturing method disclosed and suggested by the various embodiments of the present invention, without making sure that these should be within the scope of the claims of the present invention.
Fig. 1 is a schematic structural diagram of a dual-battery power supply system of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a flowchart of a control method of a dual battery power supply system of an electric vehicle according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described through embodiments with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the basic idea disclosed and suggested by the embodiments of the present invention, are within the scope of the present invention.
Fig. 1 is a schematic structural diagram of a dual battery power supply system for an electric vehicle according to an embodiment of the present invention, where the technical solution of this embodiment is suitable for a case where the dual battery power supply system is used to supply power to the electric vehicle, and the system may be implemented in a software and/or hardware manner and may be integrated in the electric vehicle.
As shown in fig. 1, the electric vehicle dual-battery power supply system provided by the present embodiment includes: a first battery assembly 100 and a second battery assembly 200 electrically connected, the first battery assembly 100 including a first battery management system 110 and a first battery 120 electrically connected, the second battery assembly 200 including a second battery management system 210 and a second battery 220 electrically connected; the first battery management system 110 is used for acquiring electrical parameters of the first battery 120; the second battery management system 210 is configured to acquire electrical parameters of the second battery 220, acquire the electrical parameters of the first battery 120 through the first battery management system 110, and switch to a target power supply mode according to the electrical parameters of the first battery 120 and the electrical parameters of the second battery 220, where the target power supply mode is a single battery power supply mode or a dual battery power supply mode.
The electric vehicle dual-battery power supply system provided by the embodiment comprises a first battery assembly 100 and a second battery assembly 200 which are electrically connected. Each battery component consists of a battery management system and a battery, wherein the battery management system is used for collecting the electrical parameters of the battery electrically connected with the battery management system, and the battery is used for supplying power to the electric vehicle. Specifically, the first battery assembly 100 includes a first battery management system 110 and a first battery 120, the second battery assembly 200 includes a second battery management system 210 and a second battery 220, the first battery management system 110 is configured to collect electrical parameters of the first battery 120, and the second battery management system 210 is configured to collect electrical parameters of the second battery 220.
The first battery pack 100 and the second battery pack 200 respectively perform data interaction through the internal existing battery management systems, namely the first battery management system 110 and the second battery management system 210, without additionally arranging a battery control unit, so that the system structure can be simplified, and the cost can be reduced. The second battery pack 200 controls the entire battery power supply system through an internal second battery management system 210. Specifically, the electrical parameters may include information such as power supply voltage, current, electric quantity, power, and temperature of the battery, and the first battery pack 100 and the second battery pack 200 further acquire the electrical parameters of the other party through the first battery management system 110 and the second battery management system 210, respectively, and learn information such as electric quantity and fault state of the other party, so as to perform optimized interaction on power supply of the dual-battery power supply system.
The first battery management system 110 obtains the electrical parameters of the second battery 220 through the second battery management system 210, determines that the second battery assembly 200 has a fault when detecting that the electrical parameters of the second battery 220 exceed the normal range, does not listen to the scheduling of the second battery management system 210, and feeds back the fault to the second battery management system 210 through the first battery management system 110 in time when determining that the fault is caused according to the electrical parameters of the first battery management system. The second battery management system 210 acquires the electrical parameters of the first battery 120 through the first battery management system 110, and switches to a target power supply mode of a single battery power supply mode or a dual battery power supply mode according to the electrical parameters of the first battery 120 and the electrical parameters of the second battery 220.
Under the condition that the double-battery power supply system allows to be suitable, for example, under the condition that the electric quantity of two battery packs is sufficient and all have no fault, the double-battery power supply mode is switched to in time, the backup of greater power supply power and system power supply is provided for the whole vehicle, and the riding safety and riding experience in the using process of a user can be ensured while the endurance mileage is improved. In addition, one battery pack is split into two battery packs, and each battery pack is small in size and convenient to carry.
The communication mode between the first battery assembly 100 and the second battery assembly 200 is not limited, and data interaction may be performed in a CAN communication mode. The determination manner of the second battery management system 210 as the control unit of the entire battery system is not limited, and for example, the first battery management system 210 and the second battery management system 220 may determine the second battery pack 200 as the control unit of the entire battery system by identifying a signal line added to the outside of the second battery pack 200.
The electric vehicle double-battery power supply system comprises a first battery assembly and a second battery assembly which are electrically connected, wherein the first battery assembly comprises a first battery management system and a first battery which are electrically connected, and the second battery assembly comprises a second battery management system and a second battery which are electrically connected; the method comprises the steps of acquiring electrical parameters of a first battery and electrical parameters of a second battery through a first battery management system and a second battery management system respectively, acquiring the electrical parameters of the first battery through the first battery management system by using the second battery management system, and switching to a single battery power supply mode or a target power supply mode of a double battery power supply mode according to the electrical parameters of the first battery and the second battery. According to the electric vehicle double-battery power supply system provided by the embodiment of the invention, the target power supply mode can be automatically switched according to the electrical parameters of the battery assembly, the maximum power supply power and the backup of system power supply are provided for the whole vehicle, the driving safety and stability can be improved while the endurance mileage is improved, and the riding experience of a user is improved. In addition, the double-battery power supply system splits one battery pack into two battery components, so that the size of a single battery component is reduced, and the double-battery power supply system is convenient to carry.
Optionally, the electric vehicle dual-battery power supply system further includes: when the electric vehicle is powered on, the second battery management system 210 is configured to control the second battery 220 to power on the electric vehicle and wake up the first battery assembly 100; alternatively, when the second battery management system 210 is powered on, the first battery 120 is controlled to be powered on for the electric vehicle when the second battery 220 is determined to be in the low battery state.
As shown in fig. 1, after the battery is accessed, the second battery management system 210 preferentially controls the second battery 220 to power on the electric vehicle, wakes up the first battery assembly 100 through a signal, and obtains the electrical parameters of the first battery assembly 100 through CAN communication or the like. If the second battery management system 210 determines that the electric vehicle cannot be powered up when the second battery 220 is in a low-power state according to the electrical parameters of the second battery 220, the second battery management system 210 wakes up the first battery assembly 100 through a signal to obtain the electrical parameters of the first battery assembly 100, and controls the first battery 120 to be powered up when the first battery assembly 100 is determined to be powered up normally according to the electrical parameters.
Optionally, the electrical parameter comprises at least a supply voltage; the second battery management system 210 is configured to determine that the open-circuit voltages of the first battery 120 and the second battery 220 are the same when it is detected that the power supply voltages of the first battery 120 and the second battery 220 are the same, and switch to the dual-battery power supply mode, or determine that the open-circuit voltages of the first battery 120 and the second battery 220 are not the same when it is detected that the power supply voltages of the first battery 120 and the second battery 220 are not the same, and switch to the single-battery power supply mode.
As shown in fig. 1, after the electric vehicle is powered on, the second battery management system 210 determines whether the open-circuit voltages of the first battery 120 and the second battery 220 are consistent according to the obtained electrical parameters of the battery assembly, and if it is detected that the supply voltages of the first battery 120 and the second battery 220 are consistent, determines that the open-circuit voltages of the first battery 120 and the second battery 220 are consistent, and switches to the dual-battery power supply mode. If the second battery management system 210 detects that the power supply voltages of the first battery 120 and the second battery 220 are inconsistent, it is determined that the open-circuit voltages of the first battery 120 and the second battery 220 are inconsistent, and the power supply mode is switched to a single battery power supply mode, and a battery assembly with high power supply voltage is used for supplying power to the electric vehicle, so as to provide the best power supply and riding power for the whole vehicle. When two battery packs with different open-circuit voltages supply power in parallel, the battery pack with the high voltage can charge the battery pack with the low voltage, and the short-circuit fault is mistakenly reported. Whether the open circuit voltage of two battery packs is unanimous is indirectly judged according to electrical parameters such as supply voltage to judge the open circuit voltage of two battery packs unanimous, when guaranteeing that two battery packs's power supply platform is unanimous promptly, adopt the bi-cell power supply mode, adopt high supply voltage's monocell power supply mode when open circuit voltage is inconsistent, can ensure user's the safety of riding, improve and ride and experience.
Optionally, the electrical parameter further comprises a discharge current; the second battery management system 210 is configured to determine that the open-circuit voltages of the first battery 120 and the second battery 220 are consistent when detecting that the discharging current ratio difference between the first battery 120 and the second battery 220 is within a preset range, or determine that the open-circuit voltages of the first battery 120 and the second battery 220 are inconsistent when detecting that the discharging current ratio difference between the first battery 120 and the second battery 220 exceeds the preset range.
As shown in fig. 1, the second battery management system 210 may determine whether the open-circuit voltages of the two battery assemblies are consistent through the supply voltage in the electrical parameter, or may further determine whether the open-circuit voltages of the two battery assemblies are consistent by detecting whether a discharging current ratio difference between the two battery assemblies is within a preset range. Specifically, when detecting that the discharge current ratio difference between the first battery 120 and the second battery 220 is within the preset range, the second battery management system 210 determines that the open-circuit voltages of the first battery 120 and the second battery 220 are consistent, and switches to the dual-battery power supply mode; when the difference of the discharge current ratios of the first battery 120 and the second battery 220 is detected to exceed the preset range, the open-circuit voltages of the first battery 120 and the second battery 220 are determined to be inconsistent, and the single battery power supply mode is switched to avoid mutual charging and short circuit. The preset range of the discharge current ratio difference is not limited, and may be set according to the actual condition of the battery, for example, the preset range may be set as the absolute value of the discharge current difference between the two battery packs divided by the average value.
Due to the influence of the internal resistance of the battery, the voltages of the battery pack in the power supply state and the battery pack in the open circuit state in the two battery packs cannot be completely consistent, so that whether the open circuit voltages of the two battery packs are consistent cannot be accurately judged only according to the power supply voltages of the two battery packs. If the open-circuit voltages of the two battery assemblies are close to the discharge current difference of the two battery assemblies and are not too large, the open-circuit voltages are within a certain range, namely a preset range. Whether the open-circuit voltages of the two battery packs are consistent or not is further judged according to the discharging current proportion difference value of the two battery packs, the two battery packs are more practical, and the judgment accuracy can be improved.
The second battery management system 210 may detect the power supply voltages and/or the discharging current ratio difference of the two battery packs at a certain time interval, and when it is detected that the power supply voltages of the two battery packs are consistent and/or the discharging current ratio difference is within a preset range, the two battery management systems are switched to a dual-battery power supply mode to perform parallel power supply, so as to optimize a power supply scheme and provide the best power supply and better riding experience for the electric vehicle.
Optionally, the battery assembly includes a discharge circuit and a charge circuit; the second battery management system is used for controlling the discharge loop and the charging loop of each battery assembly to be opened when the dual-battery power supply mode is switched to, and performing dual-battery parallel power supply; and the second battery management system is used for switching to a single battery power supply mode, opening the discharging loop and the charging loop of the control target battery assembly, closing the discharging loop and the charging loop of the other battery assembly and supplying power to the single battery.
The two battery assemblies comprise a discharging loop and a charging loop, and when the discharging loop of the battery assembly is opened, the battery assembly can supply power to the whole vehicle; in the situations of braking or downhill and the like, components such as a motor control module and the like in the electric vehicle can reversely charge the battery assembly through the charging loop, so that the endurance mileage is improved, and therefore, the charging loop needs to be opened in the riding process. Under the double-battery power supply mode, the second battery management system controls the opening of a discharging loop and a charging loop of the two battery assemblies to carry out double-battery parallel power supply; in the monocell power supply mode, the second battery management system controls to open a discharging loop and a charging loop of a target battery assembly with high voltage, and close a discharging loop and a charging loop of another battery assembly with low voltage to supply monocells, so that mutual charging short circuit caused by parallel power supply of the two battery assemblies is prevented, and optimal power supply is provided for the electric vehicle.
Optionally, the electrical parameter comprises an electrical quantity; the electric quantity of the target battery pack is greater than that of the other open-circuit state battery pack.
Under the monocell power supply mode, the second battery management system control opens the discharge circuit and the charge circuit of the target battery pack of high electric quantity, and closes the discharge circuit and the charge circuit of the battery pack of another low electric quantity, carries out the monocell power supply to provide best power supply and ride power for whole car, improve user's the experience of riding.
Optionally, after the second battery management system is switched to the single battery power supply mode, if it is detected that the electric quantity of the battery assembly in the power supply state is lower than the electric quantity of the battery assembly in the open circuit state, or a fault of the battery assembly in the power supply state is detected, the second battery management system controls to open a discharging loop of the battery assembly in the open circuit state, close a discharging loop and a charging loop of the battery assembly in the power supply state, and finally open a charging loop of the battery assembly in the open circuit state.
Under the monocell power supply mode, after the battery pack in the power supply state continuously supplies power for a period of time, the electric quantity of the battery pack in the power supply state may be obviously lower than that of the battery pack in the open circuit state, so that the riding experience of a user is influenced, or when the battery pack in the power supply state breaks down, riding is influenced. When the second battery management system detects the above conditions, the second battery management system firstly controls to open the discharging loop of the battery assembly in the open circuit state to supply power to the electric vehicle, then closes the discharging loop and the charging loop of the battery assembly in the power supply state, and finally opens the charging loop of the battery assembly in the open circuit state, namely the second battery management system monitors the electric quantity and the fault state of the two battery assemblies in real time, and adjusts the power supply strategy to ensure the power supply of the battery assembly with high electric quantity in the single battery power supply mode, and optimizes the power supply scheme. In addition, the closing or opening sequence of the charging loop and the discharging loop of the two battery assemblies can enable the two battery assemblies to be switched to supply power stably, and the situation of sudden power failure or unstable power supply cannot occur.
Optionally, the second battery management system is configured to, when it is detected that any one of the battery packs fails, turn on a power supply output path of another battery pack, and turn off the power supply output path of the failed battery.
When the second battery management system detects that one battery pack of the two battery packs has a fault, the power supply output path of the other battery pack is switched on to supply power for the electric vehicle, so that the battery pack without the fault problem continues to supply power, the power supply output path of the battery pack with the fault is cut off in time, the riding speed can be slowly reduced, and the condition of sudden power failure or unstable power supply can not occur. The double-battery power supply system provided by the embodiment can automatically switch the power supply mode according to the state of the battery assembly, select the double-battery power supply mode or the single-battery power supply mode, can stably switch without power failure, and can improve riding safety and user experience.
Optionally, the electric vehicle dual-battery power supply system further includes: after the power supply is finished, the second battery management system sends power supply limiting power and electrical parameters to the whole vehicle system according to the target power supply mode of the current double-battery power supply system, and the whole vehicle system adjusts the power utilization condition of the whole vehicle according to the electrical parameters.
After the power supply is finished, the second battery management system CAN send corresponding power supply limiting power and electrical parameters of the battery assembly to the whole vehicle system in a CAN communication mode according to a target power supply mode of the current double-battery power supply system, and each component of the whole vehicle system acquires the electrical parameters and adjusts the power utilization condition of the whole vehicle according to the functions of the component. The power supply limiting power corresponding to the target power supply mode is not limited and can be set according to the actual condition of the battery assembly. The implementation manner of the vehicle system adjusting the power consumption of the vehicle according to the electrical parameter is not limited, and for example, if the electrical parameter of the battery assembly includes voltage, current, power, electric quantity and temperature, the central control module in the vehicle system may adjust the power consumption mode of the vehicle according to the electrical parameter. For example, if the electric quantity of the battery assembly is insufficient or in the single battery power supply mode, the central control module controls the whole vehicle to be switched to the energy-saving mode, and if the electric quantity of the battery assembly is sufficient or in the double battery power supply mode, the central control module controls the whole vehicle to be switched to the motion mode. A motor controller in the whole vehicle system can adjust the acceleration performance, the climbing performance, the riding upper limit speed and the like of the whole vehicle according to the electrical parameters. And a motor controller in the whole vehicle system can reduce the power of the whole vehicle to reduce the temperature of the battery assembly and protect the battery assembly when judging that the temperature of the battery assembly is abnormal according to the temperature information. And the second battery management system sends power supply limited power and electrical parameters to the whole vehicle system according to the target power supply mode of the current double-battery power supply system, and supplies power to the whole vehicle at the optimal power supply power, so that the driving safety and the riding stability are ensured.
Fig. 2 is a flowchart of a control method of a dual-battery power supply system of an electric vehicle according to an embodiment of the present invention, and the technical solution of the embodiment is suitable for a case where the dual-battery power supply system is used to supply power to the electric vehicle. The method can be executed by the electric vehicle dual-battery power supply system provided by any embodiment of the invention, and the system can be realized by software and/or hardware and can be integrated in the electric vehicle.
The electric vehicle double-battery power supply system provided by the embodiment comprises: the battery pack comprises a first battery pack and a second battery pack which are electrically connected, wherein the first battery pack comprises a first battery management system and a first battery which are electrically connected, and the second battery pack comprises a second battery management system and a second battery which are electrically connected;
the control method comprises the following steps:
s100, the first battery management system collects electrical parameters of the first battery.
S200, the second battery management system collects electrical parameters of the second battery, obtains the electrical parameters of the first battery through the first battery management system, and switches to a target power supply mode according to the electrical parameters of the first battery and the electrical parameters of the second battery, wherein the target power supply mode is a single battery power supply mode or a double battery power supply mode.
The control method of the electric vehicle dual-battery power supply system provided by the embodiment of the invention is provided with the corresponding functional modules of the electric vehicle dual-battery power supply system provided by any embodiment of the invention.
The electric vehicle double-battery power supply system provided by the embodiment of the invention comprises a first battery assembly and a second battery assembly which are electrically connected, wherein the first battery assembly comprises a first battery management system and a first battery which are electrically connected, and the second battery assembly comprises a second battery management system and a second battery which are electrically connected. According to the control method of the electric vehicle double-battery power supply system provided by the embodiment of the invention, the first battery management system and the second battery management system are used for respectively acquiring the electrical parameters of the first battery and the second battery, the second battery management system is used for acquiring the electrical parameters of the first battery through the first battery management system, and the target power supply mode is switched to a single-battery power supply mode or a double-battery power supply mode according to the electrical parameters of the first battery and the second battery. In addition, the double-battery power supply system splits one battery pack into two battery components, so that the size of a single battery component is reduced, and the double-battery power supply system is convenient to carry.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles 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 modifications, rearrangements, combinations 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 greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
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