CN116198343A - Fuel cell vehicle and low-temperature starting method thereof - Google Patents

Fuel cell vehicle and low-temperature starting method thereof Download PDF

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Publication number
CN116198343A
CN116198343A CN202111449886.4A CN202111449886A CN116198343A CN 116198343 A CN116198343 A CN 116198343A CN 202111449886 A CN202111449886 A CN 202111449886A CN 116198343 A CN116198343 A CN 116198343A
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China
Prior art keywords
power
fuel cell
battery
cell
fuel
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CN202111449886.4A
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Chinese (zh)
Inventor
柴结实
蒋尚峰
孟德水
贾莉
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Yutong Bus Co Ltd
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Yutong Bus Co Ltd
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Priority to CN202111449886.4A priority Critical patent/CN116198343A/en
Publication of CN116198343A publication Critical patent/CN116198343A/en
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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
    • B60L50/75—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using propulsion power supplied by both fuel cells and batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/40—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for controlling a combination of batteries and fuel cells
    • 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

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Fuel Cell (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a fuel cell vehicle and a low-temperature starting method thereof, wherein the low-temperature starting method comprises the steps of judging whether the temperature of a power cell is higher than a first preset temperature, and if not, heating the power cell; judging whether the temperature of the fuel cell is higher than a second preset temperature in the heating process of the power cell, and if so, starting the fuel cell under the condition that any one of three fuel cell starting conditions is met; the three fuel cell starting conditions are respectively: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power cell charging power, the power cell heating power, and the electrical accessory power is greater than/equal to the fuel cell minimum net power. According to the invention, the problems of long starting time and large load of the power battery caused by starting the fuel battery after the power battery is heated in the prior art can be solved.

Description

Fuel cell vehicle and low-temperature starting method thereof
Technical Field
The invention belongs to the field of fuel cell automobiles, and particularly relates to a fuel cell vehicle and a low-temperature starting method thereof.
Background
Currently, a hydrogen fuel cell automobile mainly uses an electric-electric hybrid power system based on a fuel cell-power cell, wherein the power system mainly comprises a fuel cell, a power cell (such as a lithium battery), a main DC/DC converter, a vehicle-mounted hydrogen system, a driving motor and other components, and the fuel cell and the power cell are used as energy sources to supply energy for electric accessories such as whole automobile running, air conditioning and the like. Because the fuel cell can not be rapidly loaded and unloaded (the output electric power rises and falls), the electric power output can not be changed in real time along with the running requirement of the whole vehicle, and is constant power output in a short time, so that the power cell is required to play a role of a reservoir type peak clipping and valley filling, the fuel cell and the power cell in the high-voltage circuit are connected in a mixed mode, and when the output electric power of the fuel cell is higher than the whole vehicle requirement, redundant current is charged into the power cell; when the output electric quantity of the fuel cell is less than the requirement of the whole vehicle, the fuel cell and the power cell supply power for the whole vehicle together, and the insufficient part is supplemented by the power cell.
As one of the energy sources of the vehicle, a fuel cell system/engine can normally operate under the condition of externally connecting a hydrogen source, the fuel cell system/engine includes a fuel cell stack and an auxiliary system, and the fuel cell auxiliary system mainly includes: a thermal management system, a hydrogen system, an air system, an electrical system, a control system, etc.; the fuel cell stack is a power generation device which directly converts chemical energy of externally supplied hydrogen and oxygen in air into electric energy, heat energy and water through electrochemical reaction, and is formed by superposing a plurality of single cells (membrane electrodes), wherein the hydrogen and the air flow through the anode side and the cathode side of the cell to react to generate water. When the current fuel cell is started at the temperature lower than 0 ℃, if the temperature of the current fuel cell cannot be quickly increased, water generated by reaction can be frozen to further influence the reaction, even the starting failure is caused, in addition, the fuel cell system/engine cannot completely follow the whole vehicle requirement and cannot realize zero power output after being started, the minimum net output power is about 12.5% of rated power, and the minimum net output power is about 10kW, namely the minimum net output power of the fuel cell is 10kW after the fuel cell is started, for example, the rated power of the fuel cell is 80 kW.
As another energy source of the vehicle, the currently used power battery is a lithium ion battery, the low temperature adaptability problem exists, the battery cannot be charged when the self temperature is less than 0 ℃, so that the power battery in the current electric-electric hybrid power system loses the peak clipping and valley filling functions, when the vehicle brakes and stops, the redundant electric quantity of the fuel battery cannot be charged into the lithium battery, the fuel battery cannot be started at low temperature, the temperature of the power battery is slowly raised, and the fastest level of the current industry is about 0.5 ℃/min, namely, the power battery needs to be heated from-30 ℃ to 0 ℃ for 60min.
Aiming at the problems that the fuel cell cannot completely follow the whole vehicle requirement and cannot realize zero power output, and the power cell cannot be charged at low temperature, so that the fuel cell cannot be started at low temperature, the fuel cell is started to heat at low temperature in the prior art, and the fuel cell is restarted to be started after the fuel cell is heated to a low temperature releasing state and the charging performance of the power cell meets the charging requirement. A fuel cell hybrid vehicle and a low temperature start control method, apparatus thereof are disclosed, for example, in chinese patent application publication No. CN109962313a, which provides an energy control strategy: at low temperature, the vehicle runs purely electrically, the power battery heats up automatically, when the first set temperature is reached, the power battery heats up the fuel battery to supply energy, and when the second set temperature is reached, the fuel battery is started to supply energy to the whole vehicle.
However, the prior art has the following problems: 1) The fuel cell can not be started to provide energy for the whole vehicle, so that the whole vehicle can only run in a pure electric mode, because the fuel cell vehicle is provided with fewer lithium cells (relative to the power cell), the pure electric running time and the running mileage of the whole vehicle are limited at low temperature, if the temperature of the battery is very low (meaning that the heating time is very long) or the battery SOC is insufficient, the whole vehicle can not run at low temperature, a customer/driver can wait for the whole vehicle to warm up, 2) the fuel cell is started after the power cell is heated, at this moment, if the fuel cell is in a low temperature state, the fuel cell can be started after the fuel cell is heated and warmed up, and the fuel cell and the power cell can be in a low temperature state after being heated for about 60 minutes, at this moment, the fuel cell can be started, but the fuel cell still needs to be started after being heated for 15 minutes, and the starting time is too long.
In summary, in the prior art, the fuel cell is started after the power cell is heated, so that the starting time is longer, and the burden of the power cell is larger.
Disclosure of Invention
The invention provides a fuel cell vehicle and a low-temperature starting method thereof, which are used for solving the problems of longer starting time and larger burden of a power cell caused by starting the fuel cell after the power cell is heated in the prior art.
In order to solve the technical problems, the invention provides a low-temperature starting method of a fuel cell vehicle, comprising the following steps:
1) Judging whether the temperature of the power battery is higher than a first preset temperature, and if not, heating the power battery;
2) Judging whether the temperature of the fuel cell is higher than a second preset temperature in the heating process of the power cell, and if so, starting the fuel cell under the condition that any one of three fuel cell starting conditions is met; the three fuel cell starting conditions are respectively: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power cell charging power, the power cell heating power, and the electrical accessory power is greater than/equal to the fuel cell minimum net power.
The beneficial effects of the technical scheme are as follows: heating the power battery when the temperature of the power battery does not reach the first preset temperature, and judging whether the fuel battery is started or not through a fuel battery starting condition when the temperature of the fuel battery exceeds the second preset temperature, wherein the fuel battery can be started in the heating process of the power battery under the condition, and the fuel battery does not need to be restarted when the temperature of the power battery reaches the first preset temperature, so that the starting time is shortened, and the load of the power battery is reduced; in addition, the starting condition is judged in the heating process of the power battery, wherein the starting condition considers different combination conditions of the charging power of the power battery, the heating power of the power battery and the power of the electric accessory, so that the starting judgment can be more flexible.
Further, in order to avoid failure of starting the vehicle caused by too low temperature of the fuel cell, the invention provides a method for starting the fuel cell vehicle at low temperature, which further comprises in step 2), if the temperature of the fuel cell is less than or equal to a second preset temperature, the fuel cell enters a warm-up mode.
Further, the present invention provides a method of low temperature starting a fuel cell vehicle, the electrical accessory including an air conditioner and/or a defroster.
Further, in order to find out abnormality of the power battery in time, the invention provides a low-temperature starting method of the fuel battery vehicle, which further comprises the step 1) of detecting whether the power battery is heated normally in real time, if not, the power battery fails.
Further, in order to facilitate heating of the power battery, the invention provides a low-temperature starting method of the fuel cell vehicle, which further comprises the step that the power battery is heated by adopting an internally arranged electric heating module.
The invention also provides a fuel cell vehicle, which comprises a fuel cell, a power cell, an electric accessory, a battery management system, a fuel cell controller and a whole vehicle controller, wherein the battery management system is connected with the power cell; the fuel cell controller is used for judging whether the temperature of the fuel cell is higher than a second preset temperature in the heating process of the power cell, and if so, feeding back a judging result to the whole vehicle controller; when the temperature of the fuel cell is higher than the second preset temperature, the whole vehicle controller judges whether any one of three fuel cell starting conditions is met, and the three fuel cell starting conditions are respectively as follows: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power, the power battery heating power and the electric accessory power is larger than/equal to the lowest net power of the fuel battery, and if any one of the fuel battery starting conditions is met, a starting command is sent to the fuel battery controller so as to start the fuel battery.
Further, in order to avoid a failure in starting the vehicle caused by an excessively low temperature of the fuel cell, the invention provides a fuel cell vehicle, and the fuel cell controller controls the fuel cell to enter a warm-up mode if the temperature of the fuel cell is less than or equal to a second preset temperature.
Further, the present invention provides a fuel cell vehicle, the electrical accessory including an air conditioner and/or a defroster.
Further, in order to find out the abnormality of the power battery in time, the invention provides a fuel cell vehicle, which also comprises a battery management system for detecting whether the power battery is heated normally in real time, and judging that the power battery fails if not.
Further, in order to facilitate heating of the power battery, the invention provides a fuel cell vehicle, which further comprises an electric heating module arranged in the power battery.
Drawings
Fig. 1 is a flowchart of a low-temperature start-up method of a fuel cell vehicle of the present invention.
Detailed Description
In order to make the objects, technical schemes and technical effects of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Fuel cell vehicle low temperature start method embodiment:
fig. 1 is a flowchart of a low-temperature start-up method of a fuel cell vehicle of the present invention. The specific flow is as follows:
step one: judging whether the temperature of the power battery is higher than a first preset temperature, and if not, heating the power battery.
Specifically, in the first step, the temperature of the power battery is reliable and the jump is less, so that whether the whole vehicle is in a low-temperature state or not is judged through the temperature of the power battery. As shown in fig. 1, judging whether the temperature of the power battery is higher than a first preset temperature T1, if so, indicating that the vehicle is in a non-low temperature state or in a low temperature state, and normally driving at the moment; if not, the current whole vehicle is in a low-temperature state, the charging of the power battery is limited, and the self-heating is started, so that the power battery is gradually heated. The first preset temperature T1 is generally the low temperature of the power battery corresponding to the power battery charging power being more than or equal to the lowest net power of the fuel battery. The net power refers to the net output of the system after the power of the fuel cell is subtracted from the power of the accessories (such as an air compressor, a water pump, a hydrogen circulating pump and the like), and the lowest net power of the fuel cell refers to the net output of the fuel cell when the fuel cell works at the lowest point.
In the first step, the power battery is self-heated by an internally arranged electric heating module. In order to ensure that the power battery is in an optimal state, heating is generally started when the temperature of the power battery is less than or equal to 15 ℃, and the power battery is stopped after the temperature is reached. In order to timely find the abnormality of the power battery in the self-heating process, detecting the temperature of the power battery in real time, judging whether the power battery is heated normally or not according to the temperature, and judging that the power battery fails if the power battery cannot be heated normally, and prompting a driver to overhaul; if the heating is normal, the process proceeds to step three to determine the temperature of the fuel cell.
In this embodiment, before the first step, it is first determined whether the fuel cell switch is in the "on state", if yes, the step is entered to determine the temperature of the power cell, and if not, it is indicated that the vehicle is in the "electric only" mode, that is, the vehicle only has the power cell operating.
Step two: and judging whether the temperature of the fuel cell is higher than a second preset temperature, and if so, starting the fuel cell under the condition that the starting condition of the fuel cell is met.
In the second step, as shown in fig. 1, whether the temperature of the fuel cell is greater than a second preset temperature T2 is determined, if the temperature of the fuel cell is less than or equal to the second preset temperature T2, the fuel cell is in a low-temperature state, the fuel cell needs to be started at a low temperature, at this time, the fuel cell needs to be controlled to be started/kept in a heating and warming mode, self-heating and warming are started immediately, a standby state is kept after the warming is completed, a starting instruction sent by the whole vehicle controller is waited, if the fuel cell receives the starting instruction sent by the whole vehicle controller in the warming process, the current warming state is continued, and the fuel cell is directly started after the warming is completed; if the temperature is higher than the second preset temperature T2, judging whether any one of the three fuel cell starting conditions is met, and if so, starting the fuel cell at any time (namely starting up). The second preset temperature T2 is generally a critical value at which the fuel cell is started at a low temperature. The starting conditions of the fuel cells are determined according to the power consumption condition, and if the power consumption condition only comprises heating the power cells, the starting conditions of the fuel cells are that the heating power of the power cells is larger than/equal to the lowest net power of the fuel cells; if the power consumption condition includes heating and charging the power cell, the fuel cell starting condition is that the sum of the power cell charging power and the power cell heating power is greater than/equal to the lowest net power of the fuel cell; if the power consumption condition includes heating, charging, and powering the electrical accessory, the fuel cell start-up condition is that the sum of the power cell charging power, the power cell heating power, and the electrical accessory power is greater than/equal to the fuel cell minimum net power.
Specifically, as shown in fig. 1, firstly, judging whether the heating power of the power battery is greater than/equal to the lowest net power of the fuel battery, if yes, sending a start-up command to the fuel battery, and if not, indicating that the electric quantity of the fuel battery cannot be constantly consumed after the fuel battery is started up, and then, judging other power consumption conditions;
considering that the power battery can gradually accept the charge of the fuel battery at 0-10 ℃, and the charging power also changes in real time along with the temperature rise of the battery, calculating the sum of the charging power of the power battery and the heating power of the power battery in real time, judging whether the sum of the charging power of the power battery and the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery, if so, sending a start-up instruction to the fuel battery, and if not, indicating that the electric quantity of the fuel battery cannot be constantly consumed after the start-up of the fuel battery, and judging other power consumption conditions;
in view of the fact that in order to improve the comfort and safety of the vehicle during running at low temperature, the driver of the vehicle turns on the electric accessories such as air conditioner and/or defroster which consume electricity, so that whether the driver turns on the electric accessories such as air conditioner and/or defroster is recognized in real time, if the electric accessories are not turned on, the fuel cell is required to be controlled to be turned on/kept in a heating and warming mode, and the fuel cell is continuously warmed up until the low temperature of the fuel cell is relieved; if the electric accessory is started, the sum of the power battery charging power, the power battery heating power and the electric accessory power is monitored and calculated in real time, whether the sum of the power battery charging power, the power battery heating power and the electric accessory power is larger than/equal to the lowest net power of the fuel battery is judged, if yes, a start-up instruction is sent to the fuel battery, and if not, the start-up/heating and warming-up mode of the fuel battery is controlled. After a starting command is sent to the fuel cell, the output power of the fuel cell can be adjusted according to the current whole vehicle requirement.
In this embodiment, if the electric accessories such as air conditioner and/or defroster are on, the fuel cell power can be adjusted according to the requirements of the electric accessories such as air conditioner/defroster, thereby reducing the power cell load so that more energy can be used for vehicle running. According to the low-temperature starting method of the fuel cell vehicle, when the temperature of the power cell does not reach the first preset temperature, the power cell is heated, and whether the fuel cell is started or not is judged through the starting condition of the fuel cell when the temperature of the fuel cell exceeds the second preset temperature, in this case, the fuel cell is controlled to finish starting in the heating process of the power cell, if the fuel cell is heated firstly, the fuel cell can be kept in a standby state, the fuel cell does not need to be started after being heated after the heating of the power cell is finished firstly, the starting time is shortened, and the load of the power cell is reduced; in addition, the starting condition of the fuel cell is judged in the heating process of the power cell, wherein the starting condition considers different combination conditions of the charging power of the power cell, the heating power of the power cell and the power of the electric accessory, so that the starting judgment can be more flexible. In addition, when the starting condition of the fuel cell is met, the electric quantity can be constantly consumed after the fuel cell is started, and when the condition is met, the starting can reduce the pure running time of the vehicle, provide energy for heating the power cell, reduce the burden of the power cell, improve the running interval and the range of the vehicle, reduce the waiting time of clients, improve the low-temperature adaptability of the high vehicle, solve the problem of low-temperature starting of the fuel cell automobile to a certain extent, and in addition, all the judgment of the low-temperature starting method of the embodiment is based on the actual control message and is uploaded to the controller in real time by all the parts, and the low-temperature starting method can be suitable for all the fuel cells and the power cell configuration, so the method is suitable for all the vehicle types and the configuration, and improves the universality of the control strategy.
In the present embodiment, three fuel cell starts are sequentially determined when determining whether fuel cell starts are satisfied, and in other embodiments, three fuel cell starts may be determined in parallel.
In this embodiment, the electrical accessory includes an air conditioner and/or defroster. In other embodiments, the electrical accessory further comprises a driver seat heater.
Fuel cell vehicle embodiments:
the present embodiment also provides a fuel cell vehicle, which is, for example, a hydrogen fuel cell vehicle based on an electric-electric hybrid system. The fuel cell vehicle includes a fuel cell, a power cell, an electrical accessory, a battery management system, a fuel cell controller, and a vehicle controller. An electric heating module is arranged in the power battery, the battery management system is connected with the power battery, the fuel battery controller is connected with the fuel battery, and the whole vehicle controller is connected with the battery management system and the fuel battery controller.
In this embodiment, the battery management system is configured to determine whether the temperature of the power battery is greater than a first preset temperature, and if not, control the power battery to heat.
In this embodiment, the fuel cell controller is configured to determine whether the temperature of the fuel cell is greater than a second preset temperature during a heating process of the power cell, feed back a determination result to the whole vehicle controller, and receive a start command from the whole vehicle controller to control start-up and start of the fuel cell.
In this embodiment, the fuel cell controller may also adjust the output power of the fuel cell according to the current overall vehicle demand.
In this embodiment, when the temperature of the fuel cell is greater than the second preset temperature, the whole vehicle controller determines whether any one of three fuel cell starting conditions is satisfied, and the three fuel cell starting conditions are respectively: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power, the power battery heating power and the electric accessory power is larger than/equal to the lowest net power of the fuel battery, and if any one of the fuel battery starting conditions is met, a starting command is sent to the fuel battery controller so as to start the fuel battery.
The battery management system, the fuel cell controller and the whole vehicle controller form a fuel cell vehicle low-temperature start control system to implement a fuel cell vehicle low-temperature start method, which has been described in detail in the above method embodiments and will not be described herein.
The fuel cell vehicle based on the embodiment can solve the problems of long starting time and large burden of the power cell caused by starting the fuel cell after the power cell is heated in the prior art.

Claims (10)

1. A low-temperature start-up method of a fuel cell vehicle, characterized by comprising:
1) Judging whether the temperature of the power battery is higher than a first preset temperature, and if not, heating the power battery;
2) Judging whether the temperature of the fuel cell is higher than a second preset temperature in the heating process of the power cell, and if so, starting the fuel cell under the condition that any one of three fuel cell starting conditions is met; the three fuel cell starting conditions are respectively: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power cell charging power, the power cell heating power, and the electrical accessory power is greater than/equal to the fuel cell minimum net power.
2. The method of claim 1, wherein in step 2), if the temperature of the fuel cell is less than or equal to the second preset temperature, the fuel cell enters a warm-up mode.
3. The method of claim 1, wherein the electrical accessory comprises an air conditioner and/or a defroster.
4. The method of claim 1, wherein in step 1), it is detected in real time whether the power cell is normally heated, and if not, the power cell fails.
5. The method for low-temperature starting of a fuel cell vehicle according to claim 1 or 4, wherein the power cell is heated by an internally provided electric heating module.
6. The fuel cell vehicle comprises a fuel cell, a power cell, an electric accessory, a battery management system, a fuel cell controller and a whole vehicle controller, wherein the battery management system is connected with the power cell;
the fuel cell controller is used for judging whether the temperature of the fuel cell is higher than a second preset temperature in the heating process of the power cell, and if so, feeding back a judging result to the whole vehicle controller;
when the temperature of the fuel cell is higher than the second preset temperature, the whole vehicle controller judges whether any one of three fuel cell starting conditions is met, and the three fuel cell starting conditions are respectively as follows: the heating power of the power battery is larger than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power and the power battery heating power is greater than/equal to the lowest net power of the fuel battery; the sum of the power battery charging power, the power battery heating power and the electric accessory power is larger than/equal to the lowest net power of the fuel battery, and if any one of the fuel battery starting conditions is met, a starting command is sent to the fuel battery controller so as to start the fuel battery.
7. The fuel cell vehicle according to claim 6, wherein the fuel cell controller controls the fuel cell to enter the warm-up mode if the fuel cell temperature is less than or equal to a second preset temperature.
8. The fuel cell vehicle of claim 6, wherein the electrical accessory comprises an air conditioner and/or a defroster.
9. The fuel cell vehicle of claim 6, wherein the battery management system detects whether the power battery is normally heated in real time, and if not, determines that the power battery is malfunctioning.
10. The fuel cell vehicle according to claim 6 or 9, characterized in that an electric heating module is provided in the power cell.
CN202111449886.4A 2021-11-30 2021-11-30 Fuel cell vehicle and low-temperature starting method thereof Pending CN116198343A (en)

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