CN116742066A - Method for controlling a temperature control device of an electrochemical cell system - Google Patents

Method for controlling a temperature control device of an electrochemical cell system Download PDF

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Publication number
CN116742066A
CN116742066A CN202210207755.3A CN202210207755A CN116742066A CN 116742066 A CN116742066 A CN 116742066A CN 202210207755 A CN202210207755 A CN 202210207755A CN 116742066 A CN116742066 A CN 116742066A
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China
Prior art keywords
temperature
coolant outlet
low
setting
coolant
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CN202210207755.3A
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Inventor
S·安布罗克
钱立彬
李国宁
许玉江
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to CN202210207755.3A priority Critical patent/CN116742066A/en
Publication of CN116742066A publication Critical patent/CN116742066A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04701—Temperature
    • H01M8/04723—Temperature of the coolant
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
    • H01M8/0432—Temperature; Ambient temperature
    • H01M8/04358—Temperature; Ambient temperature of the coolant
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Fuel Cell (AREA)

Abstract

The present invention relates to a method for controlling a temperature control device of an electrochemical cell system, the electrochemical cell system further comprising an electrochemical cell as a power source for a vehicle, the temperature control device being configured to set a temperature T in accordance with a coolant outlet set Adjusting the temperature of a coolant delivered to an electrochemical cell, comprising the steps of: s101: detecting the output current I of the electrochemical cell in real time; s201: the measured output current I is compared with a preset low current value I low And a high current value I high Comparing if I is less than or equal to I low S301 is performed; if I is greater than or equal to I high S401 is performed; if I low <I<I high S501 is performed; s301: setting the coolant outlet at a temperature T set Adjusted to a preset low coolant temperature T low The method comprises the steps of carrying out a first treatment on the surface of the S401: setting the coolant outlet at a temperature T set Adjusted to a preset high coolant temperature T high The method comprises the steps of carrying out a first treatment on the surface of the S501: will cool the agentOutlet set temperature T set Is adjusted so that T low ≤T set ≤T high 。

Description

Method for controlling a temperature control device of an electrochemical cell system
Technical Field
The present invention relates generally to vehicles having electrochemical cells as a power source, and more particularly to a temperature control method for controlling a cooling system of an electrochemical cell.
Background
Electrochemical cells, which are generally classified into two types of storage batteries adapted to convert chemical energy stored in the storage batteries into electric energy, and fuel cells adapted to receive externally supplied fuel gas and generate electric energy through electrochemical reaction of the fuel gas. The development of electrochemical cells, which are assembled into vehicles as a power source, is driven by the development of electric vehicles and hybrid vehicles, and the generated electric energy is supplied to an engine for propelling the vehicles. In particular, fuel cells are favored because of their cleanliness and high efficiency. In a typical fuel cell system, hydrogen or a hydrogen-rich gas is supplied as a reactant through a flow path to the anode side of the fuel cell, and oxygen is supplied as a reactant through a separate flow path to the cathode side of the fuel cell, with positively charged ionic hydrogen being electrochemically converted with negatively charged ionic oxygen to produce electrical energy. Therefore, the only byproducts generated by the fuel cell system are pure water and heat. Heat may be discharged to the surrounding environment through a cooling system. Typically, a cooling system associated with the fuel cell stack includes a circulation pump for circulating a liquid coolant through the fuel cell stack and a radiator such that the liquid coolant absorbs heat in the fuel cell stack and dissipates heat in the radiator.
However, one practical challenge with existing fuel cell powered vehicles is that the cooling system may compete with the engine for electrical energy when the engine is operating at high load, resulting in insufficient electrical energy being available to the engine, which adversely affects the power performance of the vehicle.
Accordingly, there is a need in the art for a solution that more reasonably balances the cooling of the fuel cell and the power supply of the engine.
Disclosure of Invention
In order to solve the above-mentioned problems in the prior art, the present invention proposes a method for controlling a temperature control device of an electrochemical cell system further comprising an electrochemical cell as a power source of a vehicle, the temperature control device being configured toTo set the temperature T according to the coolant outlet set Adjusting the temperature of a coolant delivered to the electrochemical cell, wherein the method comprises the steps of:
s101: detecting the output current I of the electrochemical cell in real time;
s201: the measured output current I is compared with a preset low current value I low And a high current value I high Comparing if I is less than or equal to I low S301 is performed; if I is greater than or equal to I high S401 is performed; if I low <I<I high S501 is performed;
s301: setting the coolant outlet at a temperature T set Adjusted to a preset low coolant temperature T low ；
S401: setting the coolant outlet at a temperature T set Adjusted to a preset high coolant temperature T high ；
S501: setting the coolant outlet at a temperature T set Is adjusted so that T low ≤T set ≤T high 。
According to an alternative embodiment of the present invention, S501 is: setting the coolant outlet at a temperature T set Is adjusted so that:
T set ＝T low the method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive value constant and DeltaI is the variation of the output current I.
According to an alternative embodiment of the invention, wherein,
s301 is also: setting the starting level LV low;
s401 is also: setting the starting level LV high; and is also provided with
S501 comprises the following sub-steps:
s502: judging the start level LV, if the start level LV is low, executing
Line S503; if the start level LV is high, S504 is performed;
s503: according to control curve C 1 Adjusting the coolant outlet set temperature T set ；
S504: according to control curve C 2 Adjusting the coolant outlet set temperature T set The method comprises the steps of carrying out a first treatment on the surface of the Wherein,,
the control curve C 1 And the control curve C 2 The output current I is taken as a horizontal axis, and the temperature T is set by the coolant outlet set A curve with a vertical axis, and wherein the control curve C 1 Located on the control curve C 2 Is above the (c).
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low 。
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive constant and ΔI is the amount of change in the output current I; and is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low 。
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive constant and ΔI is the output currentVariation of I.
According to an alternative embodiment of the invention, wherein,
s301 is also: setting the starting level LV low;
s401 is also: setting the starting level LV high; and is also provided with
S501 comprises the following sub-steps:
s502: judging the start level LV, and if the start level LV is low, executing S503; if the start level LV is high, S504 is performed;
s503: according to control curve C 2 Adjusting the coolant outlet set temperature T set ；
S504: according to control curve C 1 Adjusting the coolant outlet set temperature T set The method comprises the steps of carrying out a first treatment on the surface of the Wherein,,
the control curve C 1 And the control curve C 2 The output current I is taken as a horizontal axis, and the temperature T is set by the coolant outlet set A curve with a vertical axis, and wherein the control curve C 1 Located on the control curve C 2 Is above the (c).
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high 。
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive value constant and DeltaI is the variation of the output current I.
According to an alternative embodiment of the invention, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive constant and ΔI is the amount of change in the output current I; and is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high 。
The invention may be embodied in the form of illustrative embodiments shown in the drawings. It should be noted, however, that the drawings are merely illustrative and that any variations contemplated under the teachings of the present invention are considered to be included within the scope of the present invention.
Drawings
The drawings illustrate exemplary embodiments of the invention. The drawings should not be construed as necessarily limiting the scope of the invention, wherein:
FIG. 1 is a schematic layout of an electrochemical cell system suitable for implementing a temperature control method according to the present invention;
FIG. 2 is a schematic flow chart of a temperature control method according to the present invention;
FIG. 3 is a schematic diagram of a control curve corresponding to one embodiment of a temperature control method according to the present invention;
FIG. 4 is a schematic illustration of a control curve corresponding to another embodiment of a temperature control method according to the present invention;
FIG. 5 is a schematic illustration of a control curve corresponding to yet another embodiment of a temperature control method according to the present invention;
FIG. 6 is a schematic illustration of a control curve corresponding to yet another embodiment of a temperature control method according to the present invention;
FIG. 7 is a schematic illustration of a control curve corresponding to yet another embodiment of a temperature control method according to the present invention; and
fig. 8 is a schematic view of a control curve corresponding to still another embodiment of the temperature control method according to the present invention.
Detailed Description
Further features and advantages of the invention will become apparent from the following description with reference to the attached drawings. Exemplary embodiments of the invention are illustrated in the accompanying drawings, and the various drawings are not necessarily drawn to scale. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided only to illustrate the present invention and to convey the spirit and substance of the invention to those skilled in the art.
The present invention aims to propose an improved method for controlling the temperature of an electrochemical cell, which may be, for example, a power cell of an electric and/or hybrid vehicle, which aims to convert chemical energy into electrical energy and supply the electrical energy to the engine of the vehicle and other electrical consumers. In particular, the electrochemical cell may be a storage battery adapted to directly convert chemical energy of an internally stored active substance (e.g. lead dioxide) into electrical energy. In addition, the electrochemical cell may also be a fuel cell adapted to receive externally supplied fuel gas (e.g., hydrogen-rich gas, oxygen-rich gas) and to generate electrical energy using the electrochemical reaction of these fuel gases. Electrochemical cells, which are the power cells of a vehicle, tend to have a greater power and therefore, whatever the type of electrochemical cell, generate more heat during operation (particularly under high loads, such as when the vehicle is heavily loaded, accelerating, climbing), and in order to dissipate this heat to avoid the creation of excessive temperatures and thus to ensure the safety of the cell and the vehicle, it is often necessary to equip the cell with a cooling device that can control the temperature of the coolant that will flow through the electrochemical cell in order to absorb the heat of the electrochemical cell. However, the cooling device also consumes electrical energy generated by the electrochemical cell during operation, and if the cooling device consumes too much electrical energy, it may result in insufficient electrical energy being supplied to the engine, thereby adversely affecting the power performance of the vehicle. The present invention aims to more reasonably distribute the electrical energy generated by the electrochemical cells, so as to achieve a better balance between the electrical energy supplied to the engine and the electrical energy supplied to the cooling device, so as to ensure the power performance of the vehicle while ensuring that the electrochemical cells are properly cooled.
Various alternative embodiments of the temperature control method according to the present invention are described in detail below with reference to the accompanying drawings. It should be noted that although a fuel cell will be described below as an example, it will be understood by those skilled in the art that the temperature control method according to the present invention may also be applied to control the temperature of other types of electrochemical cells, such as batteries, and thus the manner in which the temperature of any type of electrochemical cell is controlled under the teachings of the present invention should be considered to fall within the scope of the present invention.
Referring to fig. 1, there is shown a schematic layout of an electrochemical cell system suitable for implementing a temperature control method according to the present invention. In the example shown in fig. 1, the electrochemical cell system 100 is in the form of a fuel cell system, the fuel cell system 100 comprising a fuel cell stack 110, the fuel cell stack 110 comprising a plurality of fuel cells 111 arranged in a stacked configuration, wherein each fuel cell 111 is adapted to receive a fuel gas and to generate electrical energy by electrochemical reaction of the fuel gas. The fuel cell system 100 further includes a temperature control device 120 for controlling the temperature of the coolant and a coolant pump 130 driving the flow of the coolant. Specifically, the temperature control device 120 includes a radiator 121 and a fan 122, and the fan 122 uses air as a heat exchange medium, which may form an air flow on the surface of the radiator 121, thereby promoting heat exchange between the air and a coolant in the radiator 121. Of course, the fan 122 may be replaced by other types of heat exchangers (e.g., a water chiller). As shown in solid line portions of fig. 1, the fuel cell system 100 is provided with a coolant loop 140, the coolant loop 140 fluidly connecting the fuel cell stack 110, the radiator 121, and the coolant pump 130 to allow the coolant pump 130 to drive the coolant to circulate through the fuel cell stack 110 and the radiator 121. In particular, a plurality of check valves 150 are also provided on the coolant circuit 140. The coolant will absorb the fuel cell stack 110 as it flows through the fuel cell stack 110Heat, thereby lowering the temperature of the fuel cell stack 110; when flowing through the radiator 121, since the fan 122 causes air on the surface of the radiator 121 to flow, heat of the coolant will be absorbed by the air flow, so that the temperature of the coolant is lowered. Specifically, the temperature control device 120 may control the temperature of the coolant at the outlet of the radiator 121 according to a set coolant temperature (hereinafter may be referred to as a coolant outlet set temperature T) set ) To adjust the temperature of the coolant in the radiator 121. In the embodiment shown in fig. 1, the temperature T may be set according to the coolant outlet set To regulate the power delivered to the fan 122 (or other type of heat exchanger) to control its operation. In particular if the coolant outlet set temperature T set Lower, then the heat exchange efficiency of the air flow (or other heat exchange medium) with the radiator 121 needs to be increased in order to lower the temperature of the coolant to a greater extent, at which time the temperature control device 120 will operate the fan 122 with a higher load, which will result in more electrical power being consumed by the temperature control device 120; conversely, if the coolant outlet is set at a temperature T set Higher, the temperature control device 120 will consume less power.
As shown in phantom in fig. 1, the fuel cell system 100 further includes a power supply circuit 160, which power supply circuit 160 electrically connects the fuel cell stack 110 with power consuming devices of the vehicle (e.g., the temperature control device 120, the power system 200 of the vehicle (e.g., the engine), and other power consuming devices) in order to deliver electrical energy generated by the fuel cell stack 110 to the power consuming devices. As is well known, the power demand of the power system 200 is highest in all the power consuming devices for a vehicle powered by an electrochemical cell, and thus it can be considered that the load of the fuel cell stack 110 corresponds to the load of the power system 200, that is, the low load region of the fuel cell stack 110 corresponds to the low load region of the power system 200, the medium load region of the fuel cell stack 110 corresponds to the medium load region of the power system 200, and the high load region of the fuel cell stack 110 corresponds to the high load region of the power system 200. For example, when the load carried by the vehicle is large, the vehicle is rapidly accelerated, and the vehicle climbs a slope at a large angle, the power system 200 is operated at a high load, and the fuel cell stack 110 needs to be operated at a high load or even at a full load to supply the electric power required by the power system 200. However, it should be noted that if constant electrical energy is still delivered to the temperature control device 120 to maintain its operating efficiency while the powertrain 200 is operating at high load, it may result in insufficient electrical energy being available to the powertrain 200, thereby affecting the power performance of the vehicle.
In order to more reasonably balance the power delivered to the temperature control device 120 with the power delivered to the power system 200 and other power consuming devices, the temperature control device 120 may be controlled by the temperature control method according to the present invention. Referring to fig. 2 to 8, wherein fig. 2 shows a schematic flow chart of a temperature control method according to the present invention, and fig. 3 to 8 show schematic diagrams of a control curve C corresponding to various embodiments of the temperature control method according to the present invention, the control curve C having an output current I of a fuel cell stack as a horizontal axis and a coolant outlet set temperature T set Is the vertical axis. It is worth mentioning that the curves shown in fig. 3-8 more intuitively reflect the various embodiments of the temperature control method according to the invention.
As shown in fig. 2, the temperature control method includes the steps of:
step S101: detecting an output current I of the fuel cell stack 110 at intervals Δt (i.e., in real time); since the fuel cells generally output electric power at a constant voltage, the load of the fuel cell stack 110 can be reflected more accurately by detecting the output current of the fuel cell stack 110, for example, if the output current I is low, the fuel cell stack 110 can be considered to be operating at a low load; conversely, if the output current I is high, the fuel cell stack 110 can be considered to be operating at a high load;
step S201: the measured output current I is compared with a preset low current value I low And a high current value I high Comparing, if the output current I is less than or equal to the low current value I low Step S301 is performed; if the output current I is greater than or equal to the high current value I high Step S401 is performed; if the current value I is low low <Output current I<High current value I high Step S501 is executed;
step S301: setting the coolant outlet at a temperature T set Set to a low coolant temperature T low (e.g., may be a predetermined value);
step S401: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high (e.g., may be a predetermined value); and
step S501: setting the coolant outlet at a temperature T set Is set such that T low ≤T set ≤T high 。
In the control curves shown in fig. 3 to 8, it can be seen that the above-described temperature control method actually defines three intervals on the horizontal axis, namely, the first interval (corresponding to the low load region): at low current value I low The following, second interval (corresponding to the mid-load region): at low current value I low And a high current value I high Between, and a third interval (corresponding to the high load region): at a high current value I high Above, and in the first section, step S301 is performed, in the second section, step S501 is performed, and in the third section, step S401 is performed.
In this configuration, when the output current I of the fuel cell stack 110 is at a low current value I low Hereinafter, it may be considered that the fuel cell stack 110 is operating in the low load region, and the power system 200 is also operating in the low load region and does not consume excessive power, at which time the fuel cell stack 110 may supply sufficient power to the temperature control device 120, which allows the temperature control device 120 to operate with high efficiency, so that the coolant outlet set temperature T may be set set Set to a lower low coolant temperature T low The method comprises the steps of carrying out a first treatment on the surface of the When the output current I is at a low current value I low And a high current value I high In between, it can be considered that the fuel cell stack 110 is operating in the medium load region, the power system 200 is also operating in the medium load region, and more electric power is required to be consumed than in the low load region, and in order to ensure the electric power supply of the power system 200, it is required to reduce the electric power consumed by the temperature control device 120, so that the coolant outlet set temperature T can be appropriately increased set The method comprises the steps of carrying out a first treatment on the surface of the While when the output current I is at the high current value I high In the above, it can be considered that the fuel cell stack 110 is operating in the high load region, and the power system 200 is also operating in the high load region and needs to consume a large amountElectric power, in order to ensure the supply of electric power to the power system 200, it is necessary to further reduce the electric power consumed by the temperature control device 120, thereby setting the coolant outlet to the temperature T set Set to a relatively high coolant temperature T high 。
However, it should be noted that by increasing the coolant outlet set temperature T set The electric power consumption of the cooling device 120 can be reduced, but this does not mean that the actual temperature of the coolant will rise to the coolant outlet set temperature T set . According to fourier's law:
wherein J is T Representing the heat transfer rate per unit area perpendicular to the direction of heat transfer,represents the temperature gradient, and κ represents the thermal conductivity. If the actual temperature of the coolant rises, the temperature gradient between the radiator 121 and the surroundings +.>Will increase, which will lead to a heat transfer rate J between the heat sink 121 and the surrounding environment T And increases to promote the surrounding annulus to absorb heat from the radiator 121 to reduce the temperature of the coolant. Therefore, by reasonably setting the above-described respective parameters, the temperature control method according to the present invention can ensure that the power system 200 always obtains sufficient electric power without a significant increase in the operating temperature of the fuel cell stack 110.
In particular, a low current value I can be used low Is arranged below 300A; will have a high current value I high Is set above 400A, more particularly, the high current value I high Between 530A and 600A; will low coolant temperature T low Is set between 60 ℃ and 80 ℃; and/or high coolant temperature T high Is set between 90 ℃ and 95 ℃. In addition, a high coolant temperature T high Less than the maximum operating temperature T of the fuel cell stack 110 max (e.g., 110 c), whereby the safety of the fuel cell 110 and the vehicle can be ensured.
An alternative embodiment of the temperature control method according to the invention is described below with the aid of the control curves shown in fig. 3-8.
According to an alternative embodiment of the invention, as shown in the control curve in fig. 3, in the medium load zone (I low ～I high ) In the coolant outlet set temperature T set =high coolant temperature T high In other words, step S501 consists in: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high . That is, when the output current I reaches the low current value I low Above, i.e., when the fuel cell stack 110 is operating in the medium load region and the high load region, the coolant outlet set temperature T set Set to a high coolant temperature T high So as to minimize the electrical energy consumed by the temperature control device 120, which allows the powertrain 200 to be assured of obtaining sufficient electrical energy once it enters the medium and high load regions to ensure the power performance of the vehicle.
In particular, as shown in FIG. 3, the control curve C comprises two curve segments C in parallel in a second interval (i.e., mid-load region) 1 、C 2 To distinguish between the two, one of the two curve segments is drawn in solid lines and the other is drawn in dashed lines. In order to determine whether the fuel cell stack 110 enters the medium load region from the low load region or the high load region, a parameter of the medium load region entrance level LV (which may also be referred to as the start level LV) is introduced, wherein step S301 further consists in: setting the mid load zone inlet level LV low; step S401 further consists in: setting the mid-load zone inlet level LV high; and as shown in fig. 2, step S501 includes the sub-steps of: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high I.e. to set the coolant outlet temperature T set Following curve segment C 1 As indicated by the arrow in fig. 3; such asIf the mid-load zone entry level LV is high, then sub-step S504 is performed: setting the coolant outlet at a temperature T set Set to a low coolant temperature T low I.e. to set the coolant outlet temperature T set Following curve segment C 2 As indicated by the arrows in fig. 3. Under this configuration, if the load of the fuel cell stack 110 is gradually increased (which means that the load of the power system 200 is gradually increased) and the medium load zone is entered from the low load zone during running of the vehicle, the medium load zone inlet level LV is set low and the coolant outlet set temperature T set Will be set to a high coolant temperature T high Thereby timely ensuring that the power system 200 is able to obtain sufficient electrical energy; however, if the load of the fuel cell stack 110 is gradually reduced (which means that the load of the power system 200 is gradually reduced), and the medium load zone is entered from the high load zone, the medium load zone inlet level LV is set to be high, and the coolant outlet set temperature T set Will be set to a low coolant temperature T low The temperature of the coolant can thus be reduced in time, thereby absorbing a large amount of heat generated when the fuel cell stack 110 is operated in a high load region in time, so as to rapidly reduce the temperature of the fuel cell stack 110. Thus, this configuration allows for both a timely supply of electrical energy to the power system 200 and a timely cooling of the fuel cell stack 110.
According to an alternative embodiment of the present invention, referring to fig. 4, the embodiment shown in fig. 4 differs from the embodiment shown in fig. 3 only in step S501, i.e. the control manner of the second zone (medium load zone). As shown in fig. 4, step S501 includes the following sub-steps: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Set to a low coolant temperature T low I.e. to set the coolant outlet temperature T set Following curve segment C 2 The method comprises the steps of carrying out a first treatment on the surface of the If the mid-load zone entry level LV is high, sub-step S504 is performed: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high I.e. to set the coolant outlet temperature T set Following curve segment C 1 . At the position ofWith this configuration, if the load of the fuel cell stack 110 gradually increases and enters the medium load zone from the low load zone during running of the vehicle, the medium load zone inlet level LV is set low and the coolant outlet set temperature T set Will be set to a low coolant temperature T low This allows the fuel cell stack 110 to be cooled effectively even in the medium load region, so that the safety of the fuel cell stack 110 is ensured more reliably; however, if the load of the fuel cell stack 110 gradually decreases and enters the medium load zone from the high load zone, the medium load zone inlet level LV is set high and the coolant outlet set temperature T set Will be set to a high coolant temperature T high This enables sufficient electrical energy to be delivered to the powertrain 200 when the load of the powertrain 200 is reduced from a high load to a medium load, which helps to avoid abrupt changes in vehicle dynamics to ensure a good ride experience for the occupants of the vehicle. Thus, this configuration compromises the safety of the fuel cell stack 110 and the ride experience of the occupants of the vehicle.
According to an alternative embodiment of the present invention, referring to fig. 5, the embodiment shown in fig. 5 differs from the embodiments shown in fig. 3 to 4 only in step S501, i.e. the control manner of the second zone (medium load zone). As shown in fig. 5, step S501 further consists in: setting the coolant outlet at a temperature T set Is set such that the coolant outlet set temperature T set Wherein K is a positive constant, Δi=i cur -I prev ，I cur Is the output current measured at the present moment, and I prev Is the output current measured at the previous time, and thus Δi is the amount of change in the output current I of the fuel cell stack 110. In this configuration, in the second zone (medium load zone), the coolant outlet set temperature T set As the output current I of the fuel cell stack 110 changes and is proportional to the change, this causes the coolant outlet set temperature T to change as the load of the fuel cell stack 110 changes set Gradual change, whereby abrupt changes in the operating temperature of the fuel cell stack 110 can be avoided, which is advantageous in ensuring the safety of the fuel cell stack 110.
In particularAs shown in fig. 5, the control curve C also includes two curve segments C in parallel in the second section 1 、C 2 . Similar to the embodiment shown in fig. 3 and 4, step S301 further consists in: setting the mid load zone inlet level LV low; step S401 further consists in: setting the mid-load zone inlet level LV high; and step S501 comprises the sub-steps of: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Is set such that its variation Δt=k·Δi, i.e., such that the coolant outlet set temperature T set Following curve segment C 1 The method comprises the steps of carrying out a first treatment on the surface of the If the mid-load zone entry level LV is high, sub-step S504 is performed: setting the coolant outlet at a temperature T set Set to a low coolant temperature T low I.e. to set the coolant outlet temperature T set Following curve segment C 2 . Under this configuration, if the load of the fuel cell stack 110 gradually increases and enters the medium load zone from the low load zone during running of the vehicle, the medium load zone inlet level LV is set low and the coolant outlet set temperature T set As the output current I of the fuel cell stack 110 increases, the electric power consumed by the temperature control device 120 may be gradually reduced, thereby allowing the electric power supplied to the power system 200 to be gradually increased; however, if the load of the fuel cell stack 110 gradually decreases and enters the medium load zone from the high load zone, the medium load zone inlet level LV is set high and the coolant outlet set temperature T set Will be set to a low coolant temperature T low The temperature of the coolant can thus be reduced in time, thereby absorbing a large amount of heat generated when the fuel cell stack 110 is operated in a high load region in time, so as to rapidly reduce the temperature of the fuel cell stack 110. Thus, this configuration allows for both a timely supply of electrical energy to the power system 200 and a timely cooling of the fuel cell stack 110.
According to an alternative embodiment of the present invention, referring to fig. 6, the embodiment shown in fig. 6 differs from the embodiment shown in fig. 5 only in step S501, i.e. the control manner of the second zone (medium load zone). As shown in fig. 6, step S501 includes the following sub-stepsThe steps are as follows: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Set to a low coolant temperature T low I.e. to set the coolant outlet temperature T set Following curve segment C 2 The method comprises the steps of carrying out a first treatment on the surface of the If the mid-load zone entry level LV is high, sub-step S504 is performed: setting the coolant outlet at a temperature T set Is set such that its variation Δt=k·Δi, i.e., such that the coolant outlet set temperature T set Following curve segment C 1 . Under this configuration, if the load of the fuel cell stack 110 gradually increases and enters the medium load zone from the low load zone during running of the vehicle, the medium load zone inlet level LV is set low and the coolant outlet set temperature T set Will be set to a low coolant temperature T low This allows the fuel cell stack 110 to be cooled effectively even in the medium load region, so that the safety of the fuel cell stack 110 is ensured more reliably; however, if the load of the fuel cell stack 110 gradually decreases and enters the medium load zone from the high load zone, the medium load zone inlet level LV is set high and the coolant outlet set temperature T set The decrease in the output current I of the fuel cell stack 110 is accompanied by a gradual increase in the power consumed by the temperature control device 120, which helps to avoid abrupt changes in the vehicle dynamics and to ensure a good riding experience for the occupants of the vehicle. Thus, this configuration compromises the safety of the fuel cell stack 110 and the ride experience of the occupants of the vehicle.
In particular, as shown in fig. 7, the control curve C also comprises, in the second interval, two curve segments C in parallel 1 、C 2 . Similar to the embodiment shown in fig. 5, step S301 also consists in: setting the mid load zone inlet level LV low; step S401 further consists in: setting the mid-load zone inlet level LV high; and step S501 comprises the sub-steps of: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high I.e. to let the coolant outSet temperature T set Following curve segment C 1 The method comprises the steps of carrying out a first treatment on the surface of the If the mid-load zone entry level LV is high, sub-step S504 is performed: setting the coolant outlet at a temperature T set Is set such that its variation Δt=k·Δi, i.e., such that the coolant outlet set temperature T set Following curve segment C 2 . Under this configuration, if the load of the fuel cell stack 110 gradually increases and enters the medium load zone from the low load zone during running of the vehicle, the medium load zone inlet level LV is set low and the coolant outlet set temperature T set Is set to a high coolant temperature T high The electrical energy consumed by the temperature control device 120 can thereby be reduced in time to allow for an increase in the electrical energy supplied to the power system 200 in time; however, if the load of the fuel cell stack 110 gradually decreases and enters the medium load zone from the high load zone, the medium load zone inlet level LV is set high and the coolant outlet set temperature T set The decrease in the output current I of the fuel cell stack 110 is accompanied by a gradual increase in the power consumed by the temperature control device 120, which helps to avoid abrupt changes in the vehicle dynamics and to ensure a good riding experience for the occupants of the vehicle. Thus, this configuration allows for a timely supply of electrical energy to the powertrain 200 and a good ride experience.
According to an alternative embodiment of the present invention, referring to fig. 8, the embodiment shown in fig. 8 differs from the embodiment shown in fig. 7 only in step S501, i.e. the control manner of the second zone (medium load zone). As shown in fig. 8, step S501 includes the following sub-steps: substep S502: judging the medium load zone entry level LV, if the medium load zone entry level LV is low, executing sub-step S503: setting the coolant outlet at a temperature T set Is set such that its variation Δt=k·Δi, i.e., such that the coolant outlet set temperature T set Following curve segment C 2 The method comprises the steps of carrying out a first treatment on the surface of the If the mid-load zone entry level LV is high, sub-step S504 is performed: setting the coolant outlet at a temperature T set Set to a high coolant temperature T high I.e. to set the coolant outlet temperature T set Following curve segment C 1 . Under this configuration, if the fuel is electric during running of the vehicleThe load of the stack 110 gradually increases and goes from the low load zone to the medium load zone, then the medium load zone inlet level LV is set low and the coolant outlet set temperature T set As the output current I of the fuel cell stack 110 increases, the electric power consumed by the temperature control device 120 may be gradually reduced, thereby allowing the electric power supplied to the power system 200 to be gradually increased; however, if the load of the fuel cell stack 110 gradually decreases and enters the medium load zone from the high load zone, the medium load zone inlet level LV is set high and the coolant outlet set temperature T set Will be set to a high coolant temperature T high This allows the powertrain 200 to obtain sufficient electrical energy even if the load of the powertrain 200 is reduced from a high load to a medium load, which helps to avoid abrupt changes in vehicle dynamics to ensure a good ride experience for the occupants of the vehicle. Thus, this configuration compromises the safety of the fuel cell stack 110 and the ride experience of the occupants of the vehicle.
In the various embodiments described above, the embodiments shown in fig. 3, 5 and 7 have in common that the control curve C is followed in the case where the fuel cell stack 110 enters the second section from the first section 1 Located in a control curve C followed in the event that the fuel cell stack 110 enters the second zone from the third zone 2 As described above, this configuration allows for both timely power supply of the power system 200 and timely cooling of the fuel cell stack 110. The embodiments shown in fig. 4, 6 and 8 have in common that the control curve C is followed in the case of a fuel cell stack 110 going from a first zone to a second zone 2 Located in a control curve C followed in the event that the fuel cell stack 110 enters the second zone from the third zone 1 As described above, this configuration takes into account the safety of the fuel cell stack 110 as well as the riding experience of the occupants of the vehicle.
Although the above is set at the coolant outlet temperature T set By way of example, the coolant outlet set temperature T is described as a step change and a linear change set Relationship with the output current I of the fuel cell stack 110, but those skilled in the art will appreciate that in the teachings of the present inventionIn the following, it is obvious that the two may have other types of relationships, such as quadratic relationships, etc., and this is also obviously within the scope of the invention.
An alternative but non-limiting embodiment of the temperature control method according to the invention is described in detail above with the aid of the accompanying drawings. Modifications and additions to the techniques and structures, as well as rearrangements of the features of the embodiments, should be apparent to those of ordinary skill in the art to be encompassed within the scope of the invention without departing from the spirit and spirit of the disclosure. Accordingly, such modifications and additions as are contemplated under the teachings of the present invention should be considered as part of the present invention. The scope of the invention includes known equivalents and equivalents not yet foreseen at the time of filing date of the present application.

Claims (10)

1. Method for controlling a temperature control device of an electrochemical cell system, the electrochemical cell system (100) further comprising an electrochemical cell (110) as a power source for a vehicle, the temperature control device (120) being configured to set a temperature T in accordance with a coolant outlet set Adjusting the temperature of a coolant delivered to the electrochemical cell (110), wherein the method comprises the steps of:
s101: detecting in real time the output current I of the electrochemical cell (110);
s201: the measured output current I is compared with a preset low current value I low And a high current value I high Comparing if I is less than or equal to I low S301 is performed; if I is greater than or equal to I high S401 is performed; if I low <I<I high S501 is performed;
s301: setting the coolant outlet at a temperature T set Adjusted to a preset low coolant temperature T low ；
S401: setting the coolant outlet at a temperature T set Adjusted to a preset high coolant temperature T high ；
S501: setting the coolant outlet at a temperature T set Is adjusted so that T low ≤T set ≤T high 。
2. The method of claim 1, wherein S501 consists in: setting the coolant outlet at a temperature T set Is adjusted so that:
T set ＝T low the method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the Or alternatively
Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive value constant and DeltaI is the variation of the output current I.
3. The method according to claim 1 or 2, wherein,
s301 is also: setting the starting level LV low;
s401 is also: setting the starting level LV high; and is also provided with
S501 comprises the following sub-steps:
s502: judging the start level LV, and if the start level LV is low, executing S503; if the start level LV is high, S504 is performed;
s503: according to control curve C 1 Adjusting the coolant outlet set temperature T set ；
S504: according to control curve C 2 Adjusting the coolant outlet set temperature T set The method comprises the steps of carrying out a first treatment on the surface of the Wherein,,
the control curve C 1 And the control curve C 2 The output current I is taken as a horizontal axis, and the temperature T is set by the coolant outlet set A curve with a vertical axis, and wherein the control curve C 1 Located on the control curve C 2 Is above the (c).
4. The method of claim 3, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outletTemperature T set Adjusted to make T set ＝T low 。
5. The method of claim 3, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive constant and ΔI is the amount of change in the output current I; and is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low 。
6. The method of claim 3, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive value constant and DeltaI is the variation of the output current I.
7. The method according to claim 1 or 2, wherein,
s301 is also: setting the starting level LV low;
s401 is also: setting the starting level LV high; and is also provided with
S501 comprises the following sub-steps:
s502: judging the start level LV, and if the start level LV is low, executing S503; if the start level LV is high, S504 is performed;
s503: according to control curve C 2 Adjusting the coolant outlet set temperature T set ；
S504: according to control curve C 1 Adjusting the coolant outlet set temperature T set The method comprises the steps of carrying out a first treatment on the surface of the Wherein,,
the control curve C 1 And the control curve C 2 The output current I is taken as a horizontal axis, and the temperature T is set by the coolant outlet set A curve with a vertical axis, and wherein the control curve C 1 Located on the control curve C 2 Is above the (c).
8. The method of claim 7, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high 。
9. The method of claim 7, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T low The method comprises the steps of carrying out a first treatment on the surface of the And is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive value constant and DeltaI is the variation of the output current I.
10. The method of claim 7, wherein,
s503 is: setting the coolant outlet at a temperature T set Adjusted so that Δt=k·Δi, where Δt is the coolant outlet set temperature T set K is a positive constant and ΔI is the amount of change in the output current I; and is also provided with
S504 is: setting the coolant outlet at a temperature T set Adjusted to make T set ＝T high 。
CN202210207755.3A 2022-03-04 2022-03-04 Method for controlling a temperature control device of an electrochemical cell system Pending CN116742066A (en)

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CN202210207755.3A CN116742066A (en) 2022-03-04 2022-03-04 Method for controlling a temperature control device of an electrochemical cell system

Applications Claiming Priority (1)

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CN202210207755.3A CN116742066A (en) 2022-03-04 2022-03-04 Method for controlling a temperature control device of an electrochemical cell system

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