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CN114400742A - Power supply system for electric heavy truck and electric heavy truck - Google Patents

Power supply system for electric heavy truck and electric heavy truck Download PDF

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Publication number
CN114400742A
CN114400742A CN202210049587.XA CN202210049587A CN114400742A CN 114400742 A CN114400742 A CN 114400742A CN 202210049587 A CN202210049587 A CN 202210049587A CN 114400742 A CN114400742 A CN 114400742A
Authority
CN
China
Prior art keywords
preset
pack
voltage
energy converter
battery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202210049587.XA
Other languages
Chinese (zh)
Inventor
许祎凡
李冬梅
邱凯
黄伟东
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Anhui Yizeng Power New Energy Technology Co ltd
Original Assignee
Zhengzhou Binai New Energy Technology Co ltd
Shanghai Binei Information Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhengzhou Binai New Energy Technology Co ltd, Shanghai Binei Information Technology Co ltd filed Critical Zhengzhou Binai New Energy Technology Co ltd
Priority to CN202210049587.XA priority Critical patent/CN114400742A/en
Publication of CN114400742A publication Critical patent/CN114400742A/en
Withdrawn legal-status Critical Current

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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
    • H02J7/34—Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
    • H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
    • 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
    • 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
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
    • H02J7/007184—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage in response to battery voltage gradient
    • 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
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery
    • 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
    • H02J7/36—Arrangements using end-cell switching
    • 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
    • B60L2200/00—Type of vehicles
    • B60L2200/36—Vehicles designed to transport cargo, e.g. trucks
    • 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
    • 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
    • B60L2240/549—Current
    • 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)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention provides a power supply system for an electric heavy truck and the electric heavy truck. The power supply system for an electric heavy truck according to the present invention includes: the main battery pack is fixedly arranged on the electric heavy truck; the battery replacement pack is detachably mounted on the electric heavy truck; and the energy converter is respectively in communication connection with the main battery pack and the battery replacing pack, the input end of the energy converter is electrically connected with the output end of the battery replacing pack, the output end of the energy converter is connected with the output end of the main battery pack in parallel, the main battery pack and the battery replacing pack are respectively provided with respective BMS systems, and the energy converter comprises a communication module, an ADC (analog to digital converter) module, a microprocessor, a PWM (pulse width modulation) module and an IGBT (insulated gate bipolar transistor) module. According to the invention, the large-capacity battery pack is divided into the main battery pack and the battery replacement pack, the main battery pack reduces the requirements on charging current and charging plug-in, the battery replacement pack has the advantages of reduced volume and weight, and reduced battery replacement difficulty; the output voltage of the energy converter is slightly higher than the voltage of the main battery pack, so that the battery replacing pack is discharged preferentially and used preferentially.

Description

Power supply system for electric heavy truck and electric heavy truck
Technical Field
The invention belongs to the technical field of new energy automobiles, and particularly relates to a power supply system for an electric heavy truck and the electric heavy truck.
Background
In recent years, with the development of battery technology, new energy automobiles conform to national sustainable development strategies due to environmental protection, and are rapidly developed in recent years; however, in the field of heavy trucks, the electric heavy truck has the defects of large power consumption, long battery charging time, large charging current and easy damage of a charging socket, so that the popularization and the economical efficiency of the electric heavy truck are restricted. Therefore, the battery replacement type heavy truck can be transported as soon as possible.
In chinese patent CN111717062A, a battery replacement stacker is used to take off a power-deficient battery on a vehicle to be replaced at a side of a vehicle shuttle direction in a vehicle replacement parking area, and carry and install a fully charged battery on the vehicle; the battery storage area is arranged on the side and/or the upper side of the vehicle battery replacement parking area and is used for bearing the battery and charging the battery, the occupied area of the battery replacement station is reduced, and the battery replacement efficiency is accelerated.
In order to improve the flexible transfer performance of the battery replacement station, in chinese patent CN113400993A, a mobile heavy truck battery replacement station is proposed, in which a battery compartment is provided on a mobile semi-trailer bearing frame, a heavy truck battery replacement pack is placed in a buffer battery compartment, and a battery replacement compartment door for moving in and out of the battery replacement pack and a battery replacement robot mechanism for moving the battery replacement pack are provided on a main compartment body of the battery replacement station. However, the current heavy truck battery replacement pack is heavy in weight and complex in battery replacement operation, and can be completed only by using special equipment, so that the difficulty in battery replacement is higher than that in charging of an electric passenger vehicle. For example, in CN112248877A, a slide rail assembly is required to be used at the bottom of the battery replacement pack, and a bearing slide rail bracket is used to solve the problem of heavy battery replacement pack installation of heavy trucks. In chinese patent CN113103910A, a sliding rail and a battery replacement robot are also used to replace the battery pack. In chinese patent CN113400994A, the existing battery replacing package and the base structure of the battery replacing package are improved, so that the battery replacing process can be faster and more flexible.
In conclusion, the battery pack for the conventional electric heavy truck has the defects of high electric quantity, heavy weight, long charging time and complex battery replacement process, so that the conventional electric heavy truck has low operation efficiency, high acquisition cost and difficulty in battery charging and replacement, and cannot well meet the actual use requirement.
Disclosure of Invention
The present invention has been made to solve the above problems, and an object of the present invention is to provide a power supply system for an electric heavy truck and an electric heavy truck.
In order to achieve the purpose, the invention adopts the following technical scheme:
< first embodiment >
The invention provides a power supply system for an electric heavy truck, which is used for supplying power to the electric heavy truck and is characterized by comprising the following components: the main battery pack is fixedly arranged on the electric heavy truck; the battery replacement pack is detachably mounted on the electric heavy truck; and an energy converter, which is respectively connected with the main battery pack and the battery replacing pack in a communication way, wherein the input end of the energy converter is electrically connected with the output end of the battery replacing pack, and the output end of the energy converter is connected with the output end of the main battery pack in parallel, the main battery pack and the battery replacing pack are respectively provided with respective BMS systems, the energy converter comprises a communication module, an ADC module, a microprocessor, a PWM module and an IGBT module, the communication module is used for acquiring the operation information of the main battery pack in real time from the BMS system of the main battery pack and the operation information of the battery replacing pack in real time from the BMS system of the battery replacing pack, the ADC module is used for acquiring the operation information of the energy converter in real time, the operation information of the energy converter at least comprises the input end voltage, the output end voltage and the output end current of the energy converter, and the microprocessor judges whether the energy converter is in a normal working state according to the operation information of the energy converter, once the energy converter is judged to be in a normal working state, the microprocessor further judges whether the main battery pack meets a preset charging allowing condition or not according to the main battery pack running information, judges whether the battery replacing pack meets the preset discharging allowing condition or not according to the battery replacing pack running information, and once the main battery pack meets the preset charging allowing condition and the battery replacing pack meets the preset discharging allowing condition or not, the PWM module dynamically adjusts the duty ratio of the IGBT module according to the output end voltage and the output end current of the energy converter obtained by the ADC module in real time, so that the energy converter outputs full load constant power, and the output voltage of the IGBT module is slightly higher than the voltage of the main battery pack, and the battery replacing pack is discharged preferentially.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: the process that the microprocessor judges whether the energy converter is in a normal working state according to the running information of the energy converter is as follows: the microprocessor judges whether the voltage of the input end and the voltage of the output end of the energy converter are respectively greater than a first preset voltage value and a second preset voltage value, and once the voltage of the input end is determined to be greater than the first preset voltage value and the voltage of the output end is determined to be greater than the second preset voltage value, the energy converter is determined to be in a normal working state.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: wherein, main battery package operation information contains output voltage, output current, SOC, temperature, the single battery voltage difference and the insulation resistance of main battery package at least, predetermines and allows the condition of filling to be: the output voltage is less than the preset highest charging voltage, the output current is less than the preset maximum charging current, the SOC is less than 100%, the temperature is in a first preset temperature range, the voltage difference of the single batteries is less than a first preset voltage difference, and the insulation resistance value is not less than a first preset insulation resistance value.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: once the energy converter is fully loaded and outputs constant power, the microprocessor judges whether the output voltage of the main battery pack is not less than the preset charging maximum voltage, whether the output current is not less than the preset charging maximum current, whether the SOC is equal to 100%, whether the temperature is not within a first preset temperature range, whether the voltage difference of the single battery is not less than a first preset voltage difference and whether the insulation resistance value is less than a first preset insulation resistance value, and once any one of the output voltage is not less than the preset charging maximum voltage, the output current is not less than the preset charging maximum current, the SOC is equal to 100%, the temperature is not within the first preset temperature range, the voltage difference of the single battery is not less than the first preset voltage difference and the insulation resistance value is less than the first preset insulation resistance value is determined, the PWM module controls the energy converter to enter a standby state.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: the operation information of the battery replacing package at least comprises output voltage, output current, SOC, temperature, single battery voltage difference and insulation resistance value of the battery replacing package, and the preset discharge allowing condition is as follows: the output voltage is greater than the preset lowest discharge voltage, the output current is less than the preset maximum discharge current, the SOC is greater than 0%, the temperature is within a second preset temperature range, the voltage difference of the single batteries is less than a second preset voltage difference, and the insulation resistance value is not less than a second preset insulation resistance value.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: once the energy converter is fully loaded and outputs constant power, the microprocessor judges whether the output voltage of the battery replacing package is not greater than a preset discharging minimum voltage, whether the output current is not less than a preset discharging maximum current, whether the SOC is equal to 0%, whether the temperature is not within a second preset temperature range, whether the voltage difference of the single battery is not less than a second preset voltage difference and whether the insulation resistance value is less than a second preset insulation resistance value, and once any one of the output voltage of the battery replacing package is not greater than the preset discharging minimum voltage, the output current is not less than the preset discharging maximum current, the SOC is equal to 0%, the temperature is not within the second preset temperature range, the voltage difference of the single battery is not less than the second preset voltage difference and the insulation resistance value is less than the second preset insulation resistance value is determined, the PWM module controls the energy converter to enter a standby state.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: the battery replacement package is characterized by further comprising a relay, once the energy converter enters a standby state, the BMS system of the battery replacement package controls the relay to be disconnected and sends power-off information to the energy converter, once the communication module receives the power-off information, the microprocessor generates battery replacement package warning information, and the communication module sends the battery replacement package warning information to the vehicle control unit of the electric heavy truck.
In the power supply system for the electric heavy truck provided by the invention, the power supply system can further have the following characteristics: the battery replacing pack is a long-life and power-energy compatible battery pack.
< scheme two >
The invention also provides an electric heavy truck having the features comprising: the power supply system for the vehicle is the power supply system for the electric heavy truck in the first scheme.
Action and Effect of the invention
According to the power supply system for the electric heavy truck and the electric heavy truck, the power supply system comprises a main battery pack, a battery replacing pack and an energy converter, the main battery pack is fixedly arranged on the electric heavy truck, the battery replacing pack is detachably arranged on the electric heavy truck, the energy converter comprises a communication module, an ADC (analog to digital converter) module, a microprocessor, a PWM (pulse width modulation) module and an IGBT (insulated gate bipolar translator) module, the communication module acquires the operation information of the main battery pack from the BMS system of the main battery pack in real time and acquires the operation information of the battery replacing pack from the BMS system of the battery replacing pack in real time, the ADC module is used for acquiring the operation information of the energy converter in real time, the microprocessor judges whether the energy converter is in a normal working state according to the operation information of the energy converter, once the microprocessor judges that the energy converter is in the normal working state, the microprocessor further judges whether the main battery pack meets a preset charging condition according to the operation information of the main battery pack, and judging whether the battery replacement pack meets a preset discharge allowing condition according to the operation information of the battery replacement pack, once the main battery pack meets the preset charge allowing condition and the battery replacement pack meets the preset discharge allowing condition, the PWM module dynamically adjusts the duty ratio of the IGBT module according to the output end voltage and the output end current of the energy converter obtained by the ADC module in real time, so that the energy converter outputs at full load and constant power, the output voltage of the IGBT module is slightly higher than the voltage of the main battery pack, and the battery replacement pack is discharged preferentially, therefore, on one hand, the present embodiment divides the existing large-capacity battery pack for the heavy truck into the main battery pack and the battery replacement pack, and the main battery pack satisfies the daily driving requirement, so as to reduce the electric quantity of the main battery pack, therefore, the charging current of the main battery pack and the requirements of the charging plug-in are reduced, and the charger can fully charge the main battery pack in a shorter time; the volume of the detached battery replacement bag is reduced, the weight is reduced, and the battery replacement difficulty is reduced. On the other hand, the output voltage of the energy converter matched with the battery replacement pack is slightly higher than the voltage of the main battery pack, so that the battery replacement pack is discharged preferentially and used preferentially, the battery replacement pack and the main battery pack are combined to supply power to the motor in a driving state, and the battery replacement pack supplies power to the main battery pack in a stopping state.
Drawings
FIG. 1 is an electrical schematic of an electric heavy duty truck in an embodiment of the present invention;
FIG. 2 is a block diagram of an energy converter in an embodiment of the invention; and
fig. 3 is a flowchart illustrating the operation of the energy converter controlling the charging of the battery pack with priority according to the embodiment of the invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the following embodiments are specifically described with reference to the attached drawings.
< example >
Fig. 1 is an electrical schematic diagram of an electric heavy duty truck in an embodiment of the invention.
As shown in fig. 1 and 2, in the present embodiment, the electric heavy truck 100 includes a truck main body (not shown), and a motor 10, a motor controller 20, a Vehicle Control Unit (VCU)30, and a power supply system 40 provided on the truck main body. In the present embodiment, the vehicle control unit 30 is communicatively connected to the motor controller 20 and the power supply system 40 by using a CAN communication line.
Fig. 2 is a block diagram of an energy converter in an embodiment of the invention.
As shown in fig. 1 and 2, the power supply system 40 supplies power to the motor 10 through the motor controller 20, and includes a main battery pack 41, a battery replacement pack 42, and an energy converter 43.
As shown in fig. 1, the main battery pack 41 is fixedly mounted on the vehicle body, and an output terminal thereof is electrically connected to an input terminal of the motor controller 20. The output power of the main battery pack 41 can meet the requirement of the working condition of the whole vehicle, and the running mileage meets the requirement of daily traffic.
As shown in fig. 1, the battery replacement pack 42 is detachably mounted at a readily detachable position of the vehicle main body, and an output end thereof is electrically connected to an input end of the energy converter 43. The battery pack 42 is a long-life and power-energy compatible battery pack, and in this embodiment, the battery pack uses a single battery that is any one of a nickel-metal hydride battery, a lithium manganate battery, a lithium iron phosphate battery, a ternary lithium battery, and a lithium titanate battery.
In this embodiment, the main battery pack 41 and the battery replacement pack 42 respectively have respective components such as a BMS system, a relay, and a pre-charging resistor, so as to provide real-time control and safety protection for the respective battery packs.
As shown in fig. 1 and fig. 2, the energy converter 43 is disposed on the vehicle main body, and is in communication connection with the main battery pack 41, the battery replacement pack 42 and the vehicle control unit 30 respectively by using CAN communication lines; the output terminal of the energy converter 43 is connected in parallel with the output terminal of the main battery pack 41 through a power grid connection interface (not shown in the figure). The energy converter 43 includes a communication module 431, an ADC module (analog-to-digital conversion module) 432, a Microprocessor (MCU)433, a PWM module (pulse width modulation module) 434, an IGBT module (insulated gate bipolar transistor) 435, and a battery module 436.
The communication module 431 is used for acquiring the operation information of the main battery pack in real time from the BMS system of the main battery pack 41; the system is also used for acquiring the operation information of the battery replacement pack from the BMS system of the battery replacement pack 42 in real time; also for receiving power-off information from the battery change pack 42; and is also used for sending the warning information of replacing the battery pack to the vehicle control unit 30.
In this embodiment, the operation information of the main battery pack at least includes the output voltage, the output current, the SOC, the temperature, the voltage difference between the single batteries, and the insulation resistance of the main battery pack 41, and the operation information of the battery replacement pack at least includes the output voltage, the output current, the SOC, the temperature, the voltage difference between the single batteries, and the insulation resistance of the battery replacement pack 42.
The ADC module 432 is configured to obtain, in real time, energy converter operation information, which at least includes an input terminal voltage, an output terminal voltage, and an output terminal current of the energy converter 43.
The microprocessor 433 is used for judging whether the energy converter 43 is in a normal working state according to the running information of the energy converter; the main battery pack 41 is also used for judging whether the main battery pack 41 meets the preset charging allowing condition or not according to the main battery pack running information; and is further configured to determine whether the swap battery pack 42 meets a preset discharge allowing condition according to the swap battery pack operation information.
In this embodiment, the microprocessor 433 is further configured to determine whether the output voltage of the main battery pack 41 is not less than the preset charging maximum voltage, whether the output current is not less than the preset charging maximum current, whether the SOC is equal to 100%, whether the temperature is not within a first preset temperature range, whether the voltage difference of the single battery is not less than the first preset voltage difference, and whether the insulation resistance value is less than the first preset insulation resistance value when the energy converter 43 outputs the full load and the constant power. Once it is determined that any one of the output voltage is not less than the preset maximum charging voltage, the output current is not less than the preset maximum charging current, the SOC is equal to 100%, the temperature is not within the first preset temperature range, the voltage difference of the single battery is not less than the first preset voltage difference, and the insulation resistance value is less than the first preset insulation resistance value is established, the PWM module 434 controls the energy converter 43 to enter the standby state, thereby preventing the main battery pack from being overcharged.
In this embodiment, the microprocessor 433 is further configured to determine whether the output voltage of the battery replacement package 42 is not greater than the preset lowest discharge voltage, whether the output current is not less than the preset maximum discharge current, whether the SOC is equal to 0%, whether the temperature is not within the second preset temperature range, whether the voltage difference of the single battery is not less than the second preset voltage difference, and whether the insulation resistance value is less than the second preset insulation resistance value when the energy converter outputs the full load and the constant power. Once it is determined that the output voltage of the battery replacement pack is not greater than the preset lowest discharge voltage, the output current is not less than the preset maximum discharge current, the SOC is equal to 0%, the temperature is not within the second preset temperature range, the voltage difference of the single battery is not less than the second preset voltage difference, and the insulation resistance value is less than the second preset insulation resistance value, the PWM module 434 controls the energy converter 43 to enter the standby state, thereby preventing the battery replacement pack from being over-discharged.
In the present embodiment, once the energy converter 43 enters the standby state, the BMS system of the battery replacement pack 20 controls its own relay to be turned off and transmits the power-off information to the energy converter 43; once the communication module 431 receives the power-off information, the microprocessor 433 generates battery pack replacement warning information, the communication module 431 sends the battery pack replacement warning information to the vehicle control unit 30 of the electric heavy truck, and the vehicle control unit 30 performs display and/or voice prompt according to the battery pack replacement warning information to remind a driver to replace the battery pack replacement 42 in time.
The PWM module 434 is configured to dynamically adjust a duty ratio of the IGBT module 435 according to the output terminal voltage and the output terminal current of the energy converter 43 acquired by the ADC module 432 in real time, so that the energy converter outputs full load and constant power, and the output voltage of the IGBT module 435 is slightly higher than the output voltage of the main battery pack 10.
The IGBT module 435 is used to turn the energy converter 43 on or off.
The power module 436 is used to provide power to the microprocessor 433.
Fig. 3 is a flowchart illustrating the operation of the energy converter controlling the charging of the battery pack with priority according to the embodiment of the invention.
As shown in fig. 3, in the present embodiment, the operation flow of the energy converter 43 controlling the battery replacement pack 42 to discharge preferentially includes the following steps:
in step S1, the communication module 431 obtains the main battery pack operation information from the BMS system of the main battery pack 41 in real time and obtains the battery replacement pack operation information from the BMS system of the battery replacement pack 42 in real time, and the ADC module 432 obtains the energy converter operation information in real time, and then the process proceeds to step S2.
Step S2, the microprocessor 433 judges whether the energy converter 43 is in normal operation state according to the energy converter operation information, and when the judgment result is yes, the step S3 is entered; when the determination result is no, step S2 is executed in a loop.
In this embodiment, the process of the microprocessor 433 judging whether the energy converter 43 is in the normal operation state according to the energy converter operation information is as follows: the microprocessor 433 judges whether the voltage at the input end and the voltage at the output end of the energy converter 43 are respectively greater than a first preset voltage value and a second preset voltage value; and once the voltage of the input end is judged to be greater than the first preset voltage value and the voltage of the output end is judged to be greater than the second preset voltage value, the energy converter is judged to be in a normal working state.
Step S3, the microprocessor 433 further determines whether the main battery pack 41 meets the preset charging allowing condition according to the main battery pack operation information, and determines whether the battery changing pack 42 meets the preset discharging allowing condition according to the battery changing pack operation information, and when it is determined that the main battery pack 41 meets the preset charging allowing condition and the battery changing pack 42 meets the preset discharging allowing condition, the process proceeds to step S4; otherwise, the loop executes step S3.
In this embodiment, the preset admission condition is: the output voltage of the main battery pack 41 is less than the preset highest charging voltage, the output current is less than the preset maximum charging current, the SOC is less than 100%, the temperature is within a first preset temperature range, the voltage difference of the single battery is less than a first preset voltage difference, and the insulation resistance value is not less than a first preset insulation resistance value.
In this embodiment, the preset admission condition is: the output voltage of the battery replacement pack 42 is greater than the preset lowest discharge voltage, the output current is less than the preset maximum discharge current, the SOC is greater than 0%, the temperature is within a second preset temperature range, the voltage difference of the single battery is less than a second preset voltage difference, and the insulation resistance value is not less than a second preset insulation resistance value.
In step S4, the PWM module 434 dynamically adjusts the duty ratio of the IGBT module 435 according to the output terminal voltage and the output terminal current of the energy converter obtained by the ADC module 432 in real time, so that the energy converter 43 outputs at full load and constant power and the output voltage of the IGBT module 435 is slightly higher than the output voltage of the main battery pack 41, thereby allowing the battery pack to discharge preferentially.
Effects and effects of the embodiments
According to the power supply system for the electric heavy truck and the electric heavy truck related by the embodiment, because the power supply system comprises the main battery pack, the battery replacing pack and the energy converter, the main battery pack is fixedly installed on the electric heavy truck, the battery replacing pack is detachably installed on the electric heavy truck, the energy converter comprises the communication module, the ADC module, the microprocessor, the PWM module and the IGBT module, the communication module acquires the operation information of the main battery pack from the BMS system of the main battery pack in real time and acquires the operation information of the battery replacing pack from the BMS system of the battery replacing pack in real time, the ADC module is used for acquiring the operation information of the energy converter in real time, the microprocessor judges whether the energy converter is in a normal working state according to the operation information of the energy converter, once the energy converter is judged to be in the normal working state, the microprocessor further judges whether the main battery pack meets a preset charging condition according to the operation information of the main battery pack, and judging whether the battery replacement pack meets a preset discharge allowing condition according to the operation information of the battery replacement pack, once the main battery pack meets the preset charge allowing condition and the battery replacement pack meets the preset discharge allowing condition, the PWM module dynamically adjusts the duty ratio of the IGBT module according to the output end voltage and the output end current of the energy converter obtained by the ADC module in real time, so that the energy converter outputs at full load and constant power, the output voltage of the IGBT module is slightly higher than the voltage of the main battery pack, and the battery replacement pack is discharged preferentially, therefore, on one hand, the present embodiment divides the existing large-capacity battery pack for the heavy truck into the main battery pack and the battery replacement pack, and the main battery pack satisfies the daily driving requirement, so as to reduce the electric quantity of the main battery pack, therefore, the charging current of the main battery pack and the requirements of the charging plug-in are reduced, and the charger can fully charge the main battery pack in a shorter time; the volume of the detached battery replacement bag is reduced, the weight is reduced, and the battery replacement difficulty is reduced. On the other hand, the output voltage of the energy converter matched with the battery replacement pack is slightly higher than the voltage of the main battery pack, so that the battery replacement pack is discharged preferentially and used preferentially, the battery replacement pack and the main battery pack are combined to supply power to the motor in a driving state, and the battery replacement pack supplies power to the main battery pack in a stopping state.
In addition, because trade battery package and select long-life, the compatible group battery of power energy for use, have power and energy compromise, long-life and high safe characteristic.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.

Claims (9)

1. A power supply system for an electric heavy truck for supplying power to the electric heavy truck, comprising:
the main battery pack is fixedly arranged on the electric heavy truck;
the battery replacement pack is detachably mounted on the electric heavy truck; and
the energy converter is respectively in communication connection with the main battery pack and the battery replacing pack, the input end of the energy converter is electrically connected with the output end of the battery replacing pack, the output end of the energy converter is connected with the output end of the main battery pack in parallel,
wherein the main battery pack and the battery replacement pack are respectively provided with respective BMS systems,
the energy converter comprises a communication module, an ADC module, a microprocessor, a PWM module and an IGBT module,
the communication module is used for acquiring the operation information of the main battery pack in real time from the BMS system of the main battery pack and acquiring the operation information of the battery replacement pack in real time from the BMS system of the battery replacement pack,
the ADC module is used for acquiring the operation information of the energy converter in real time, the operation information of the energy converter at least comprises the voltage of an input end, the voltage of an output end and the current of the output end of the energy converter,
the microprocessor judges whether the energy converter is in a normal working state or not according to the running information of the energy converter,
once the energy converter is judged to be in a normal working state, the microprocessor further judges whether the main battery pack meets a preset charging allowing condition according to the main battery pack running information and judges whether the battery changing pack meets a preset discharging allowing condition according to the battery changing pack running information,
once the main battery pack is judged to accord with the preset charging allowing condition and the battery replacing pack is judged to accord with the preset discharging allowing condition, the PWM module dynamically adjusts the duty ratio of the IGBT module according to the output end voltage and the output end current of the energy converter obtained by the ADC module in real time, so that the energy converter outputs at full load and constant power, the output voltage of the IGBT module is slightly higher than the voltage of the main battery pack, and the battery replacing pack is allowed to discharge preferentially.
2. The power supply system for electric heavy trucks of claim 1, characterized in that:
the process that the microprocessor judges whether the energy converter is in a normal working state according to the running information of the energy converter is as follows:
the microprocessor judges whether the voltage at the input end and the voltage at the output end of the energy converter are respectively greater than a first preset voltage value and a second preset voltage value,
and once the voltage of the input end is judged to be greater than the first preset voltage value and the voltage of the output end is judged to be greater than the second preset voltage value, the energy converter is judged to be in a normal working state.
3. The power supply system for electric heavy trucks of claim 1, characterized in that:
wherein the operation information of the main battery pack at least comprises the output voltage, the output current, the SOC, the temperature, the voltage difference of the single battery and the insulation resistance value of the main battery pack,
the preset charging allowing conditions are as follows: the output voltage is less than the preset highest charging voltage, the output current is less than the preset maximum charging current, the SOC is less than 100%, the temperature is in a first preset temperature range, the voltage difference of the single batteries is less than a first preset voltage difference, and the insulation resistance value is not less than a first preset insulation resistance value.
4. The power supply system for electric heavy trucks of claim 3, characterized in that:
wherein, once the energy converter outputs at a full load and constant power, the microprocessor judges whether the output voltage of the main battery pack is not less than the preset charging maximum voltage, whether the output current is not less than the preset charging maximum current, whether the SOC is equal to 100%, whether the temperature is not in the first preset temperature range, whether the single battery voltage difference is not less than a first preset voltage difference, and whether the insulation resistance value is less than a first preset insulation resistance value,
once it is determined that any one of the output voltage is not less than the preset maximum charging voltage, the output current is not less than the preset maximum charging current, the SOC is equal to 100%, the temperature is not within the first preset temperature range, the cell voltage difference is not less than the first preset voltage difference, and the insulation resistance value is less than the first preset insulation resistance value is established, the PWM module controls the energy converter to enter a standby state.
5. The power supply system for electric heavy trucks of claim 1, characterized in that:
wherein the operation information of the battery replacement pack at least comprises the output voltage, the output current, the SOC, the temperature, the voltage difference of the single battery and the insulation resistance value of the battery replacement pack,
the preset allowing conditions are as follows: the output voltage is greater than the preset lowest discharge voltage, the output current is less than the preset maximum discharge current, the SOC is greater than 0%, the temperature is within a second preset temperature range, the voltage difference of the single batteries is less than a second preset voltage difference, and the insulation resistance value is not less than a second preset insulation resistance value.
6. The power supply system for electric heavy trucks of claim 5, characterized in that:
wherein, once the energy converter outputs at a full load and constant power, the microprocessor judges whether the output voltage of the battery replacement package is not greater than the preset lowest discharge voltage, whether the output current is not less than the preset maximum discharge current, whether the SOC is equal to 0%, whether the temperature is not in the second preset temperature range, whether the voltage difference of the single battery is not less than the second preset voltage difference, and whether the insulation resistance value is less than the second preset insulation resistance value,
once it is determined that any one of the output voltage of the battery replacement pack is not greater than the preset lowest discharge voltage, the output current is not less than the preset maximum discharge current, the SOC is equal to 0%, the temperature is not within the second preset temperature range, the voltage difference of the single battery is not less than the second preset voltage difference, and the insulation resistance value is less than the second preset insulation resistance value is established, the PWM module controls the energy converter to enter a standby state.
7. The power supply system for electric heavy trucks of claim 6, characterized in that:
wherein the battery replacement pack is also provided with a relay,
once the energy converter enters a standby state, the BMS system of the battery replacing package controls the relay to be switched off and sends power-off information to the energy converter,
upon the communication module receiving the power-off message, the microprocessor generates a replacement battery pack alert message,
and the communication module sends the warning information of replacing the battery pack to a vehicle control unit of the electric heavy truck.
8. The power supply system for electric heavy trucks of claim 1, characterized in that:
the battery replacement pack is a long-life and power-energy compatible battery pack.
9. An electric heavy truck, comprising:
a power supply system for a vehicle,
the power supply system for the electric heavy truck as claimed in any one of claims 1 to 8.
CN202210049587.XA 2022-01-17 2022-01-17 Power supply system for electric heavy truck and electric heavy truck Withdrawn CN114400742A (en)

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CN202210049587.XA CN114400742A (en) 2022-01-17 2022-01-17 Power supply system for electric heavy truck and electric heavy truck

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Application Number Priority Date Filing Date Title
CN202210049587.XA CN114400742A (en) 2022-01-17 2022-01-17 Power supply system for electric heavy truck and electric heavy truck

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115009047A (en) * 2022-06-20 2022-09-06 苏州比耐新能源科技有限公司 A hybrid power supply system for electric vehicles

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115009047A (en) * 2022-06-20 2022-09-06 苏州比耐新能源科技有限公司 A hybrid power supply system for electric vehicles

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