A high voltage power-on control system for a hydrogen fuel cell power system

Abstract

The present invention discloses a high-voltage power-on control system for a hydrogen fuel cell power system, comprising a hydrogen ion capacitor system A, a nickel-hydrogen battery system B and a fuel cell system, wherein the output ends of the hydrogen ion capacitor system A, the nickel-hydrogen battery system B and the fuel cell system are all connected to a power distribution system, the output end of the power distribution system is connected to a motor drive system, and the fuel cell system is composed of a heat dissipation system, an air compressor controller and a low-temperature preheating system. The high-voltage power-on control system for a hydrogen fuel cell power system can realize energy transfer from the hydrogen ion capacitor system A to the nickel-hydrogen battery system B or from the nickel-hydrogen battery system B to the hydrogen ion capacitor system A by having an output voltage value of a bidirectional DCDC controller in the hydrogen ion capacitor system A higher or lower than the output voltage of the nickel-hydrogen battery system B.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen fuel cells, and in particular to a high-voltage power-on control system for a hydrogen fuel cell power system. Background Art

[0002] In recent years, as environmental pollution problems have become more and more serious, preventing environmental pollution, protecting the environment, and maintaining ecological balance have become an important measure for social development. Traditional petroleum energy has long been unable to meet the power needs of the current automobile industry. Fuel cells with superior performance are widely considered to be the best choice for future electric vehicle energy solutions. Fuel cells are a type of efficient power generation device that directly converts the chemical energy in fuels (such as hydrogen, natural gas, etc.) and oxidants into electrical energy through electrochemical reactions without going through a combustion process. It can generate electricity continuously, and the product is mainly water, with basically no harmful gases emitted. Therefore, it is cleaner and more environmentally friendly. Fuel cell vehicles have achieved zero emissions and zero pollution in the true sense.

[0003] Due to the slow dynamic response of the fuel cell system, the output characteristics of the fuel cell cannot meet the vehicle requirements during startup, sudden acceleration, and climbing steep slopes. An energy storage system is needed to solve this problem, as well as the low-temperature startup and auxiliary high-voltage power supply problems of the fuel cell. Currently, the commonly used energy storage systems are mainly lithium-ion capacitors, supercapacitors, nickel-hydrogen batteries, lithium-ion batteries, or a combination of the two. The dual auxiliary energy system is much more complicated than an independent auxiliary energy system in terms of the high-voltage power-on process and the charge and discharge energy management and control of the two systems. It is necessary to reasonably control the high-voltage power-on sequence of the two systems in the dual auxiliary energy system and the charge and discharge energy transfer of the two systems. To this end, we propose a high-voltage power-on control system for a hydrogen fuel cell power system. Summary of the invention

[0004] The object of the present invention is to provide a high voltage power-on control system for a hydrogen fuel cell power system to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-voltage power-on control system for a hydrogen fuel cell power system, comprising a hydrogen ion capacitor system A, a nickel-hydrogen battery system B and a fuel cell system, wherein the output ends of the hydrogen ion capacitor system A, the nickel-hydrogen battery system B and the fuel cell system are all connected to a power distribution system, and the output end of the power distribution system is connected to a motor drive system, and the fuel cell system is composed of a heat dissipation system, an air compressor controller and a low-temperature preheating system;

[0006] The hydrogen ion capacitor system A is composed of a supercapacitor and a bidirectional DCDC controller, wherein the output voltage and charge and discharge current of the bidirectional DCDC controller are controllable;

[0007] The nickel-hydrogen battery system B is composed of nickel-hydrogen batteries, wherein the output voltage is uncontrollable;

[0008] High-voltage power-on control system. When the high-voltage power-on is performed, the vehicle controller collects the output voltage value Ubat of the nickel-hydrogen battery system B through CAN communication, and then transmits Ubat to the bidirectional DCDC controller in the hydrogen ion capacitor system A through CAN communication as the set value of the output voltage of the bidirectional DCDC controller. The bidirectional DCDC controller is started to work, and the charging and discharging currents of the bidirectional DCDC controller are set to zero. After the output voltage of the bidirectional DCDC controller in the hydrogen ion capacitor system A is stabilized, the output voltage of the nickel-hydrogen battery system B is started. After the high-voltage power-on of the hydrogen ion capacitor system A and the nickel-hydrogen battery system B is completed, the vehicle controller can realize energy transfer between the hydrogen ion capacitor system A and the nickel-hydrogen battery system B according to the current power system state.

[0009] Preferably, the heat dissipation system includes a heat sink and a heat dissipation fan, and the heat sink is made of copper.

[0010] Preferably, the low-temperature preheating system consists of a heat storage heat exchanger and a temperature sensor.

[0011] Preferably, the air compressor controller adopts an Intelligent Core main controller, and is equipped with a standard sub-control unit and a variable frequency sub-control unit.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the high-voltage power-on control system of the hydrogen fuel cell power system can realize energy transfer from the hydrogen ion capacitor system A to the nickel-hydrogen battery system B or from the nickel-hydrogen battery system B to the hydrogen ion capacitor system A by making the output voltage value of the bidirectional DCDC controller in the hydrogen ion capacitor system A higher or lower than the output voltage of the nickel-hydrogen battery system B, and the charging current and discharging current of the bidirectional DCDC controller in the hydrogen ion capacitor system A are both zero, thereby realizing energy transfer without charging and discharging. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a block diagram of energy flow of a power system of a high voltage power-on control system of a hydrogen fuel cell power system of the present invention;

[0014] Figure 2 A high voltage power-on flow chart of a hydrogen fuel cell power system high voltage power-on control system power system dual auxiliary energy system of the present invention;

[0015] Figure 3 This is a flow chart of charging and discharging between the dual auxiliary energy systems of the present invention. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] See also Figure 1-3 The present invention provides a technical solution: a high-voltage power-on control system for a hydrogen fuel cell power system, comprising a hydrogen ion capacitor system A, a nickel-hydrogen battery system B and a fuel cell system, wherein the output ends of the hydrogen ion capacitor system A, the nickel-hydrogen battery system B and the fuel cell system are all connected to a power distribution system, and the output end of the power distribution system is connected to a motor drive system, and the fuel cell system is composed of a heat dissipation system, an air compressor controller and a low-temperature preheating system, wherein the heat dissipation system is composed of a heat sink and a heat dissipation fan, and the heat sink is made of copper, and the low-temperature preheating system is composed of a heat storage heat exchanger and a temperature sensor, and the air compressor controller adopts an Intelligent Core main controller, and is equipped with a standard sub-control unit and a variable frequency sub-control unit;

[0018] In the dual auxiliary energy system, the hydrogen ion capacitor system A is composed of a lithium ion capacitor or a super capacitor with a bidirectional DCDC controller, and the nickel-hydrogen battery system B is composed of a nickel-hydrogen battery or a lithium ion battery. The output voltage and charge and discharge current of the bidirectional DCDC controller in the hydrogen ion capacitor system A are controllable, and the output voltage of the nickel-hydrogen battery system B is uncontrollable;

[0019] When the high voltage is powered on, the vehicle controller collects the output voltage value Ubat of the nickel-metal hydride battery system B through CAN communication, and then transmits Ubat to the bidirectional DCDC controller in the hydrogen ion capacitor system A through CAN communication as the set value of the output voltage of the bidirectional DCDC controller, starts the bidirectional DCDC controller, sets the charging and discharging currents of the bidirectional DCDC controller to zero, and waits for the output voltage of the bidirectional DCDC controller in the hydrogen ion capacitor system A to stabilize. Then, the output voltage of the nickel-metal hydride battery system B is started. Since the output voltage difference of the two systems is close to zero, there is no current shock or charge and discharge energy transfer. Next, the electric drive system can be pre-charged at high voltage;

[0020] After the high-voltage power-on of the two systems is completed, the vehicle controller can realize energy transfer between the hydrogen ion capacitor system A and the nickel-hydrogen battery system B according to the current power system state. If the current SOC of the hydrogen ion capacitor system A is relatively high and the current SOC of the nickel-hydrogen battery system B is relatively low, the output voltage of the bidirectional DCDC controller in the hydrogen ion capacitor system A is increased, and the allowable discharge current value is set, and the hydrogen ion capacitor system A charges the nickel-hydrogen battery system B; if the current SOC of the nickel-hydrogen battery system B is relatively high and the current SOC of the hydrogen ion capacitor system A is relatively low, the output voltage of the bidirectional DCDC controller in the hydrogen ion capacitor system A is reduced, and the allowable charging current value is set, and the nickel-hydrogen battery system B charges the hydrogen ion capacitor system A. By making the output voltage value of the bidirectional DCDC controller in the hydrogen ion capacitor system A higher or lower than the output voltage of the nickel-hydrogen battery system B, energy can be transferred from the hydrogen ion capacitor system A to the nickel-hydrogen battery system B or from the nickel-hydrogen battery system B to the hydrogen ion capacitor system A. The charging current and discharge current of the bidirectional DCDC controller in the hydrogen ion capacitor system A are both zero, realizing energy transfer without charging and discharging.

[0021] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high voltage power-on control system for a hydrogen fuel cell power system, comprising a hydrogen ion capacitor system A, a nickel-hydrogen battery system B and a fuel cell system, characterized in that: The output ends of the hydrogen ion capacitor system A, the nickel-hydrogen battery system B and the fuel cell system are all connected to a power distribution system, the output end of the power distribution system is connected to the motor drive system, and the fuel cell system is composed of a heat dissipation system, an air compressor controller and a low-temperature preheating system; The hydrogen ion capacitor system A is composed of a supercapacitor and a bidirectional DCDC controller, wherein the output voltage and charge and discharge current of the bidirectional DCDC controller are controllable; The nickel-hydrogen battery system B is composed of nickel-hydrogen batteries, wherein the output voltage is uncontrollable; High-voltage power-on control system, when high-voltage power-on, the vehicle controller collects the output voltage value Ubat of the nickel-hydrogen battery system B through CAN communication, and then transmits the output voltage value Ubat to the bidirectional DCDC controller in the hydrogen ion capacitor system A through CAN communication as the set value of the output voltage of the bidirectional DCDC controller, starts the bidirectional DCDC controller, sets the charging and discharging currents of the bidirectional DCDC controller to zero, waits for the output voltage of the bidirectional DCDC controller in the hydrogen ion capacitor system A to stabilize, and then starts the output voltage of the nickel-hydrogen battery system B. After the high-voltage power-on of the hydrogen ion capacitor system A and the nickel-hydrogen battery system B is completed, the vehicle controller can realize energy transfer between the hydrogen ion capacitor system A and the nickel-hydrogen battery system B according to the current power system state.

2. A high voltage power-on control system for a hydrogen fuel cell power system according to claim 1, characterized in that: The heat dissipation system includes a heat sink and a heat dissipation fan, and the heat sink is made of copper.

3. A high voltage power-on control system for a hydrogen fuel cell power system according to claim 1, characterized in that: The low-temperature preheating system is composed of a heat storage heat exchanger and a temperature sensor.

4. A high voltage power-on control system for a hydrogen fuel cell power system according to claim 1, characterized in that: The air compressor controller adopts an Intelligent Core main controller, and is equipped with a standard sub-control unit and a variable frequency sub-control unit.

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