CN113745570B - Electric pile inlet temperature adjusting system and adjusting method thereof - Google Patents
Electric pile inlet temperature adjusting system and adjusting method thereof Download PDFInfo
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- CN113745570B CN113745570B CN202111054976.3A CN202111054976A CN113745570B CN 113745570 B CN113745570 B CN 113745570B CN 202111054976 A CN202111054976 A CN 202111054976A CN 113745570 B CN113745570 B CN 113745570B
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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
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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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
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- 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
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Abstract
The invention provides a temperature regulation system and a regulation method for an inlet of a cell stack, which relate to the technical field of combustion battery equipment and comprise a cell stack, a first temperature detection mechanism, a regulation mechanism, a heat dissipation mechanism, a second temperature detection mechanism and a control device; the circulating cooling liquid at the outlet of the battery pile is divided into two circulating paths, one circulating cooling liquid is directly located at the position of the regulating mechanism, the other circulating cooling liquid is subjected to heat dissipation and temperature reduction through the heat dissipation mechanism, the theoretical temperature of the mixed circulating cooling liquid is detected and obtained through the circulating cooling liquid with two different temperatures, the opening degree of the heat dissipation mechanism is controlled by the theoretical temperature control regulating mechanism, the theoretical temperature of the mixed circulating cooling liquid is guaranteed to be close to the preset temperature, the technical problems that the detected circulating cooling liquid is mixed unevenly in the prior art, the temperature fluctuation of the mixed circulating cooling liquid is large, the pressure fluctuation in the whole circulating path is large, and the conveying of the circulating cooling liquid of the battery pile is influenced are solved.
Description
Technical Field
The invention relates to the technical field of combustion battery equipment, in particular to a temperature regulating system for an electric pile inlet and a regulating method thereof.
Background
In the control process of the fuel cell system, the circulating cooling liquid in the cell stack can be subjected to cooling treatment through two circulating paths, and the cooled circulating cooling liquid is returned to the cell stack.
In the prior art, in a normal working state of a fuel cell system, according to the power of a cell stack and the use of circulating cooling liquid, the flow of the circulating cooling liquid in two circulating paths is regulated, namely, after the circulating cooling liquid in the two circulating paths is converged to a thermostat, the flow of the two circulating paths is controlled through the opening of the thermostat to regulate the outlet temperature of the stack.
However, the opening degree of the thermostat in the prior art is adjusted according to the actual temperature of the inlet and outlet of the battery pile, however, because the thermostat mixes the circulating cooling liquid in two temperature states in two different circulating paths, when the circulating cooling liquid in two temperature states is mixed unevenly, the actually detected temperature fluctuation of the mixed circulating cooling liquid is quite large frequently, but under the condition that the inlet temperature fluctuation of the battery pile is large, the adjusting mechanism adjusts according to the current temperature information, so that the pressure fluctuation in the whole circulating path is large, the pressure difference with hydrogen/air side pressure is too large, and the conveying of the circulating cooling liquid of the battery pile is affected.
Disclosure of Invention
The invention aims to provide a temperature regulating system and a regulating method for a galvanic pile inlet, which are used for relieving the technical problems that the detected temperature fluctuation of the mixed circulating cooling liquid is large, the pressure fluctuation in the whole circulating path is large, the pressure difference with hydrogen/air side pressure is overlarge, and the conveying of the circulating cooling liquid of a cell galvanic pile is influenced due to the fact that the mixing of the circulating cooling liquid is uneven in the prior art.
The invention provides a temperature regulating system for an electric pile inlet, which comprises: the device comprises a battery stack, a first temperature detection mechanism, an adjusting mechanism, a heat dissipation mechanism, a second temperature detection mechanism and a control device;
the outlet of the battery pile is respectively communicated with the regulating mechanism and the heat dissipation mechanism, and the battery pile is used for respectively conveying initial circulating cooling liquid to the regulating mechanism and the heat dissipation mechanism;
the adjusting mechanism is communicated with the heat dissipation mechanism, the heat dissipation mechanism is used for conveying cooled circulating cooling liquid to the adjusting mechanism, the adjusting mechanism is communicated with an inlet of the battery stack, and the adjusting mechanism is used for adjusting the mixing of the initial circulating cooling liquid and the cooled circulating cooling liquid and then conveying the mixed circulating cooling liquid into the battery stack;
the first temperature detection mechanism and the second temperature detection mechanism are respectively connected with the control device in an electric signal manner, and the first temperature detection mechanism is positioned at the outlet position of the battery pile and is used for detecting the temperature of the initial circulating cooling liquid output by the battery pile and transmitting the temperature information of the initial circulating cooling liquid to the control device;
the second temperature detection mechanism is positioned between the heat dissipation mechanism and the adjusting mechanism and is used for detecting the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism and transmitting the cooled circulating cooling liquid temperature information to the control device;
the control device is in electrical signal connection with the regulating mechanism, and is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid so as to obtain theoretical temperature information of the circulating cooling liquid mixed by the regulating mechanism, and the control device is used for correspondingly controlling the opening degree of the regulating mechanism to the heat dissipation mechanism according to the theoretical temperature of the circulating cooling liquid mixed by the regulating mechanism.
In a preferred embodiment of the present invention, the hydraulic pump is further included;
the hydraulic pump is positioned at the outlet of the battery pile, is respectively communicated with the heat dissipation mechanism and the regulating mechanism, and is used for respectively conveying initial circulating cooling liquid to the heat dissipation mechanism and the regulating mechanism.
In a preferred embodiment of the present invention, the apparatus further comprises a third temperature detecting mechanism;
the third temperature detection mechanism is electrically connected with the control device, is located at an inlet position of the battery stack and is used for detecting actual temperature information of mixed circulating cooling liquid entering the battery stack, and conveying the actual temperature information of the mixed circulating cooling liquid to the control device, and the control device is used for carrying out weighted average calculation on theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid so as to obtain average temperature information of the mixed circulating cooling liquid, and is used for correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the average temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the hydraulic pump is electrically connected to the control device, and the control device is configured to adjust the delivery flow rate of the hydraulic pump according to a temperature difference between the average temperature of the mixed circulating cooling liquid and the temperature of the initial circulating cooling liquid.
In a preferred embodiment of the invention, the adjustment mechanism comprises a thermostat;
the thermostat is provided with a first inlet and a second inlet, the thermostat is communicated with the heat dissipation mechanism through the first inlet, the thermostat is communicated with the hydraulic pump through the second inlet, and the sum of the opening of the thermostat to the heat dissipation mechanism and the opening of the thermostat to the hydraulic pump is 1.
The invention provides a regulating method based on the electric pile inlet temperature regulating system, which comprises the following steps:
detecting outlet temperature information of initial circulating cooling liquid of the battery stack;
detecting the temperature of the circulating cooling liquid after the initial circulating cooling liquid is cooled by the heat dissipation mechanism;
calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid to obtain theoretical temperature information of the circulating cooling liquid after mixing the initial circulating cooling liquid and the cooled circulating cooling liquid;
and correspondingly controlling the opening degree of the regulating mechanism to the heat radiation mechanism according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the step of calculating the temperature of the initial circulating cooling liquid and the cooled circulating cooling liquid further includes:
temperature after mixing: t3=t1×r+t2×1-r;
wherein T1 is the temperature of the cooled circulating cooling liquid; t2 is the temperature of the initial circulating cooling liquid; r is the opening degree of the heat radiation mechanism conveyed to the adjusting mechanism; and 1-r is the opening degree of the battery pile conveyed to the regulating mechanism.
In a preferred embodiment of the present invention, the step of correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipating mechanism according to the theoretical temperature of the mixed circulating cooling liquid further includes:
detecting actual temperature information of the mixed circulating cooling liquid entering the battery stack;
comparing the actual temperature of the mixed circulating cooling liquid with the theoretical temperature of the mixed circulating cooling liquid to obtain a temperature difference;
and correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the temperature difference.
In a preferred embodiment of the present invention, the step of correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the temperature difference further includes:
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the opening of the heat dissipation mechanism by the regulating mechanism according to the average temperature of the mixed circulating cooling liquid;
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is higher than a preset temperature difference threshold value, the opening degree of the heat dissipation mechanism by the adjusting mechanism is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the method further comprises the steps of:
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the conveying flow of the hydraulic pump at the outlet position of the cell stack according to the average temperature of the mixed circulating cooling liquid;
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is higher than a preset temperature difference threshold value, the conveying flow of the hydraulic pump at the outlet position of the battery stack is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
The invention provides a temperature regulating system for an electric pile inlet, which comprises: the device comprises a battery stack, a first temperature detection mechanism, an adjusting mechanism, a heat dissipation mechanism, a second temperature detection mechanism and a control device; the outlet of the battery pile is respectively communicated with the regulating mechanism and the heat dissipation mechanism, and the battery pile is used for respectively conveying initial circulating cooling liquid to the regulating mechanism and the heat dissipation mechanism; the adjusting mechanism is communicated with the heat dissipation mechanism, the heat dissipation mechanism is used for conveying cooled circulating cooling liquid to the adjusting mechanism, the adjusting mechanism is communicated with an inlet of the battery pile, and the adjusting mechanism is used for adjusting the initial circulating cooling liquid and cooled circulating cooling liquid to be mixed and then conveyed into the battery pile; the first temperature detection mechanism and the second temperature detection mechanism are respectively connected with the control device in an electric signal manner, and the first temperature detection mechanism is positioned at the outlet position of the battery pile and is used for detecting the temperature of the initial circulating cooling liquid output by the battery pile and transmitting the temperature information of the initial circulating cooling liquid to the control device; the second temperature detection mechanism is positioned between the heat dissipation mechanism and the regulating mechanism and is used for detecting the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism and transmitting the cooled circulating cooling liquid temperature information to the control device; the control device is in electrical signal connection with the regulating mechanism and is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid so as to obtain theoretical temperature information of the circulating cooling liquid mixed by the regulating mechanism, and the control device is used for correspondingly controlling the opening of the regulating mechanism to the heat radiating mechanism according to the theoretical temperature of the mixed circulating cooling liquid; the method comprises the steps that the initial temperature of circulating cooling liquid at the outlet of a battery pile can be detected by using a first temperature detection mechanism, the circulating cooling liquid at the outlet of the battery pile is divided into two circulating paths, one circulating cooling liquid is directly conveyed to the position of an adjusting mechanism, the other circulating cooling liquid is conveyed to a heat dissipation mechanism for heat dissipation and temperature reduction, the two circulating cooling liquids with different temperatures are mixed and flow back to the position of the battery pile according to the preset proportion of the adjusting mechanism, and the theoretical temperature of the mixed circulating cooling liquid can be compared according to the preset temperature, so that the opening degree of the adjusting mechanism to the heat dissipation mechanism can be controlled, the theoretical temperature of the mixed circulating cooling liquid is ensured to be close to the preset temperature, the technical problems that the detected circulating cooling liquid after mixing is large in temperature fluctuation, the pressure fluctuation in the whole circulating path is large, the pressure difference with hydrogen/air side pressure is overlarge, and the conveying of the circulating cooling liquid of the battery pile is affected are solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a stack inlet temperature adjustment system according to an embodiment of the present invention.
Icon: 100-cell stack; 200-a first temperature detection mechanism; 300-an adjustment mechanism; 400-a heat dissipation mechanism; 500-a second temperature detection mechanism; 600-hydraulic pump; 700-third temperature detection mechanism.
Detailed Description
The technical solutions of the present invention will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the present embodiment provides a stack inlet temperature adjustment system, including: the battery stack 100, the first temperature detection mechanism 200, the adjustment mechanism 300, the heat dissipation mechanism 400, the second temperature detection mechanism 500, and the control device; the outlet of the battery pile 100 is respectively communicated with the regulating mechanism 300 and the heat dissipation mechanism 400, and the battery pile 100 is used for respectively conveying initial circulating cooling liquid to the regulating mechanism 300 and the heat dissipation mechanism 400; the adjusting mechanism 300 is communicated with the heat dissipation mechanism 400, the heat dissipation mechanism 400 is used for conveying cooled circulating cooling liquid to the adjusting mechanism 300, the adjusting mechanism 300 is communicated with the inlet of the battery stack 100, and the adjusting mechanism 300 is used for adjusting the mixing of the initial circulating cooling liquid and the cooled circulating cooling liquid and then conveying the mixture into the battery stack 100; the first temperature detection mechanism 200 and the second temperature detection mechanism 500 are respectively connected with the control device through electric signals, the first temperature detection mechanism 200 is positioned at the outlet position of the battery cell stack 100 and is used for detecting the temperature of the initial circulating cooling liquid output by the battery cell stack 100 and transmitting the temperature information of the initial circulating cooling liquid to the control device; the second temperature detection mechanism 500 is located between the heat dissipation mechanism 400 and the adjustment mechanism 300, and the second temperature detection mechanism 500 is configured to detect the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism 400, and send the cooled circulating cooling liquid temperature information to the control device; the control device is electrically connected with the adjusting mechanism 300, and is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid to obtain theoretical temperature information of the circulating cooling liquid mixed by the adjusting mechanism 300, and correspondingly controlling the opening of the heat dissipation mechanism 400 by the adjusting mechanism 300 according to the theoretical temperature of the mixed circulating cooling liquid.
It should be noted that, the temperature adjustment system at the inlet of the cell stack provided in this embodiment changes the heat dissipation adjustment condition of the circulating cooling liquid inside the cell stack 100 in the prior art, that is, changes the temperature detection of the two ends of the inlet and outlet of the cell stack 100, and only detects the actual temperature of the circulating cooling liquid at the outlet of the cell stack 100 and the actual temperature information of the circulating cooling liquid after heat dissipation, since the temperature information obtained by the first temperature detection mechanism 200 and the second temperature detection mechanism 500 at this time is the temperature information of the circulating cooling liquid under a single condition, that is, after the opening ratios of the circulating cooling liquid in the two temperature states are mixed, in order to avoid the detection error caused by uneven temperature mixing of the circulating cooling liquid after mixing, the theoretical temperature information of the circulating cooling liquid after mixing is obtained by using the first temperature detection mechanism 200 and the second temperature detection mechanism 500, and the calculated theoretical temperature of the circulating cooling liquid after mixing corresponds to the control of the opening degree of the heat dissipation mechanism 300, thereby avoiding frequent adjustment error caused by uneven mixing of the circulating cooling liquid in the two temperature states.
In this embodiment, the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid are calculated to obtain the mixed temperature: t3=t1×r+t2×1-r;
wherein T1 is the temperature of the cooled circulating cooling liquid; t2 is the temperature of the initial circulating cooling liquid; r is the opening degree of the heat radiation mechanism 400 to the adjusting mechanism 300; 1-r are the opening degrees at which the cell stack 100 is delivered to the regulating mechanism 300.
On the basis of not considering the heat loss of the pipeline, the theoretical temperature information of the mixed circulating cooling liquid conveyed by the regulating mechanism 300 according to the opening ratio of the regulating mechanism 300 is the sum of the initial circulating cooling liquid temperature multiplied by the opening ratio of the corresponding regulating mechanism 300 and the cooled circulating cooling liquid temperature multiplied by the opening ratio of the corresponding regulating mechanism 300; wherein, when the opening r of the heat dissipation mechanism 400 to the adjusting mechanism 300 is preset, the theoretical temperature T3 of the mixed circulating cooling liquid can be calculated; when the inlet temperature of the battery stack 100 is preset, that is, the theoretical temperature T3 of the mixed circulating coolant is known, the opening degree r information of the heat radiation mechanism 400 to the adjustment mechanism 300 is calculated from the detected T1 and T2.
Alternatively, the first temperature detecting mechanism 200 and the second temperature detecting mechanism 500 may each be a temperature sensor, and the control device may be various, for example: MCU, computer, PLC controller etc., preferably, controlling means is MCU. The micro control unit (Microcontroller Unit; MCU), also called single chip microcomputer or single chip microcomputer, is to properly reduce the frequency and specification of the CPU, integrate the peripheral interfaces such as memory, counter, USB, A/D conversion, UART, PLC, DMA, etc., and even LCD driving circuit on a single chip to form a chip-level computer for different application occasions to control different combinations.
Preferably, the control device may be an STM32F103C8T6 single-chip microcomputer, and the control device may also be controlled by a PLC, which will not be described herein.
The embodiment provides a pile entry temperature regulation system, includes: the battery stack 100, the first temperature detection mechanism 200, the adjustment mechanism 300, the heat dissipation mechanism 400, the second temperature detection mechanism 500, and the control device; the outlet of the battery pile 100 is respectively communicated with the regulating mechanism 300 and the heat dissipation mechanism 400, and the battery pile 100 is used for respectively conveying initial circulating cooling liquid to the regulating mechanism 300 and the heat dissipation mechanism 400; the adjusting mechanism 300 is communicated with the heat dissipation mechanism 400, the heat dissipation mechanism 400 is used for conveying cooled circulating cooling liquid to the adjusting mechanism 300, the adjusting mechanism 300 is communicated with the inlet of the battery stack 100, and the adjusting mechanism 300 is used for adjusting the mixing of the initial circulating cooling liquid and the cooled circulating cooling liquid and then conveying the mixture into the battery stack 100; the first temperature detection mechanism 200 and the second temperature detection mechanism 500 are respectively connected with the control device through electric signals, the first temperature detection mechanism 200 is positioned at the outlet position of the battery cell stack 100 and is used for detecting the temperature of the initial circulating cooling liquid output by the battery cell stack 100 and transmitting the temperature information of the initial circulating cooling liquid to the control device; the second temperature detection mechanism 500 is located between the heat dissipation mechanism 400 and the adjustment mechanism 300, and the second temperature detection mechanism 500 is configured to detect the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism 400, and send the cooled circulating cooling liquid temperature information to the control device; the control device is in electrical signal connection with the adjusting mechanism 300, and is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid to obtain theoretical temperature information of the circulating cooling liquid mixed by the adjusting mechanism 300, and correspondingly controlling the opening of the heat dissipation mechanism 400 by the adjusting mechanism 300 according to the theoretical temperature of the mixed circulating cooling liquid; the first temperature detection mechanism 200 is used for detecting and obtaining the initial temperature of the circulating cooling liquid at the outlet of the cell stack 100, the circulating cooling liquid at the outlet of the cell stack 100 is divided into two circulating paths, one circulating cooling liquid is directly conveyed to the position of the regulating mechanism 300, the other circulating cooling liquid is conveyed to the position of the heat dissipation mechanism 400 for heat dissipation and temperature reduction, the two circulating cooling liquids with different temperatures are mixed and flow back to the position of the cell stack 100 in the regulating mechanism 300 according to the preset proportion of the regulating mechanism 300, and it is required to be noted that the theoretical temperature of the mixed circulating cooling liquid can be compared according to the preset temperature, so that the opening degree of the regulating mechanism 300 to the heat dissipation mechanism 400 can be controlled, the theoretical temperature of the mixed circulating cooling liquid is close to the preset temperature, the technical problems that the detected circulating cooling liquid after mixing is uneven, the temperature fluctuation of the circulating cooling liquid after mixing is large, the pressure fluctuation in the whole circulating path is large, the pressure difference with hydrogen/air side pressure is overlarge, and the conveying of the circulating cooling liquid of the cell stack 100 are solved.
Further, in the preferred embodiment of the present invention, the hydraulic pump 600 is further included on the basis of the above embodiment; the hydraulic pump 600 is located at the outlet of the battery stack 100, the hydraulic pump 600 is respectively communicated with the heat dissipation mechanism 400 and the adjustment mechanism 300, and the hydraulic pump 600 is used for respectively delivering the initial circulating cooling liquid to the heat dissipation mechanism 400 and the adjustment mechanism 300.
In this embodiment, the hydraulic pump 600 can respectively convey the circulating cooling liquid at the outlet of the battery stack 100 to the positions of the adjusting mechanism 300 and the heat dissipating mechanism 400, that is, the hydraulic pump 600 can control the flow rate and the flow velocity of the initial circulating cooling liquid, wherein the hydraulic pump 600 is adjusted by the mixed circulating cooling liquid and the temperature difference of the initial circulating cooling liquid, and when the temperature of the mixed circulating cooling liquid fluctuates greatly, that is, when the temperature variation amplitude of the mixed circulating cooling liquid is large, the hydraulic pump 600 is frequently adjusted, that is, the frequent adjustment of the hydraulic pump 600 also causes the pressure fluctuation to be large, so that the pressure difference with the hydrogen/air side pressure is too large; the present embodiment provides that the theoretical temperature of the mixed circulating cooling liquid is used as the temperature of the circulating cooling liquid at the inlet position of the cell stack 100, so that the temperature stability of the mixed circulating cooling liquid is ensured, that is, the temperature difference of the circulating cooling liquid at the inlet and outlet of the cell stack 100 is ensured to be in a stable state, frequent adjustment of the hydraulic pump 600 is avoided, the problem that the pressure difference between the circulating cooling liquid and the hydrogen/air side is overlarge due to frequent fluctuation of the temperature at the inlet of the cell stack 100 is solved, and the service life of the hydraulic pump 600 is prolonged.
In a preferred embodiment of the present invention, a third temperature detection mechanism 700 is further included; the third temperature detection mechanism 700 is electrically connected to the control device, the third temperature detection mechanism 700 is located at an inlet position of the battery stack 100, and is configured to detect actual temperature information of the mixed circulating cooling liquid entering the battery stack 100, and send the mixed actual temperature information of the circulating cooling liquid to the control device, where the control device is configured to perform weighted average calculation on a theoretical temperature of the mixed circulating cooling liquid and an actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and the control device is configured to correspondingly control the opening of the heat dissipation mechanism 400 by the adjustment mechanism 300 according to the average temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the hydraulic pump 600 is electrically connected to a control device for adjusting the delivery flow rate of the hydraulic pump 600 according to the temperature difference between the average temperature of the mixed circulating cooling fluid and the temperature of the initial circulating cooling fluid.
In this embodiment, the third temperature detection mechanism 700 can detect the actual temperature of the mixed circulating cooling liquid at the inlet of the battery stack 100, so as to obtain the actual temperature information of the mixed circulating cooling liquid; the temperature of the mixed circulating cooling liquid is better adjusted by carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain the average temperature information of the mixed circulating cooling liquid, and by carrying out weighted average on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid, the possibility that the obtained temperature approaches to the ideal temperature of the mixed circulating cooling liquid to be adjusted, the temperature value of the mixed circulating cooling liquid in a single mode is avoided, the service life of the adjusting mechanism 300 or the hydraulic pump 600 is influenced, and the use of the circulating cooling liquid in the cell stack 100 is influenced, so that the cell stack 100 is abnormally cooled, and the temperature of the fuel cell is excessively high or excessively low is avoided; alternatively, the third temperature detection mechanism 700 may be a temperature sensor.
Average temperature of the circulating coolant:
wherein T5 is the average temperature of the mixed circulating cooling liquid; t3 is the theoretical temperature of the mixed circulating cooling liquid; t4 is the actual temperature of the mixed circulating coolant.
In a preferred embodiment of the present invention, the adjustment mechanism 300 includes a thermostat; the thermostat has a first inlet through which the thermostat communicates with the heat radiation mechanism 400 and a second inlet through which the thermostat communicates with the hydraulic pump 600, and the sum of the opening of the thermostat to the heat radiation mechanism 400 and the opening to the hydraulic pump 600 is 1.
Optionally, the thermostat is a valve controlling the coolant flow path; is a temperature-regulating device, which generally comprises a temperature-sensing component, and the flow of air, gas or liquid is turned on or off by means of thermal expansion or contraction. In this embodiment, the opening of the thermostat may be adjusted by using the electric signal connection between the thermostat and the preset control device and using a preset temperature control flow, so that the temperature of the inlet of the battery stack 100 may be ensured to be within a preset temperature range under different working conditions.
The adjusting method based on the electric pile inlet temperature adjusting system provided in the embodiment comprises the following steps: detecting outlet temperature information of the initial circulating coolant of the battery stack 100; detecting the temperature of the circulating cooling liquid after the initial circulating cooling liquid is cooled by the heat radiation mechanism 400; calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid to obtain theoretical temperature information of the circulating cooling liquid after mixing the initial circulating cooling liquid and the cooled circulating cooling liquid; the opening degree of the heat radiation mechanism 400 by the adjusting mechanism 300 is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the step of calculating the temperature of the initial circulating cooling liquid and the cooled circulating cooling liquid further includes:
temperature after mixing: t3=t1×r+t2×1-r;
wherein T1 is the temperature of the cooled circulating cooling liquid; t2 is the temperature of the initial circulating cooling liquid; r is the opening degree of the heat radiation mechanism 400 to the adjusting mechanism 300; 1-r are the opening degrees at which the cell stack 100 is delivered to the regulating mechanism 300.
In this embodiment, the circulating cooling liquid which does not pass through the heat dissipation mechanism 400 is in small circulation flow, the circulating cooling liquid which passes through the heat dissipation mechanism 400 for heat dissipation and temperature reduction is in large circulation flow, and the theoretical temperature of the circulating cooling liquid after more accurate mixing can be obtained through calculation due to different discharge proportions of the circulating cooling liquid in the large circulation flow and the circulating cooling liquid in the small circulation flow through the adjusting mechanism 300;
the calculation is as follows:
m1: the mass of the circulating cooling liquid passing through the heat radiation mechanism 400; m2: the mass of the circulating coolant directly delivered to the location of the adjustment mechanism 300; m3: the total mass of the mixed circulating cooling liquid;
according to the heat calculation formula q= cmT
The method can obtain: q1=cm1t1, q2=cm2t2
Total mass: m3=m1+m2
The thermostat opening is r, so: m1=m3×r, m2=m3×1-r
The temperature after mixing is therefore: t3=t1×r+t2×1-r.
On the basis of not considering the heat loss of the pipeline, the theoretical temperature information of the mixed circulating cooling liquid conveyed by the opening proportion of the regulating mechanism 300 through the regulating mechanism 300 is the sum of the initial circulating cooling liquid temperature multiplied by the opening proportion of the corresponding regulating mechanism 300 and the cooled circulating cooling liquid temperature multiplied by the opening proportion of the corresponding regulating mechanism 300; wherein, when the opening r of the heat dissipation mechanism 400 to the adjusting mechanism 300 is preset, the theoretical temperature T3 of the mixed circulating cooling liquid can be calculated; when the inlet temperature of the battery stack 100 is preset, that is, the theoretical temperature T3 of the mixed circulating coolant is known, the opening degree r information of the heat radiation mechanism 400 to the adjustment mechanism 300 is calculated from the detected T1 and T2.
In a preferred embodiment of the present invention, the step of correspondingly controlling the opening degree of the adjusting mechanism 300 to the heat dissipating mechanism 400 according to the theoretical temperature of the mixed circulating cooling liquid further includes: detecting actual temperature information of the mixed circulating coolant entering the battery stack 100; comparing the actual temperature of the mixed circulating cooling liquid with the theoretical temperature of the mixed circulating cooling liquid to obtain a temperature difference; the opening degree of the adjusting mechanism 300 to the heat radiation mechanism 400 is correspondingly controlled according to the temperature difference.
In a preferred embodiment of the present invention, the step of correspondingly controlling the opening degree of the adjusting mechanism 300 to the heat dissipating mechanism 400 according to the temperature difference further includes: when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the opening of the heat dissipation mechanism 400 by the regulating mechanism 300 according to the average temperature of the mixed circulating cooling liquid; when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is higher than the preset temperature difference threshold value, the opening degree of the heat dissipation mechanism 400 by the adjusting mechanism 300 is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the method further comprises the steps of: when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the conveying flow of the hydraulic pump 600 at the outlet position of the cell stack 100 according to the average temperature of the mixed circulating cooling liquid; when the temperature difference between the actual temperature of the mixed circulating cooling fluid and the theoretical temperature of the mixed circulating cooling fluid is higher than a preset temperature difference threshold value, the delivery flow rate of the hydraulic pump 600 at the outlet position of the battery stack 100 is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling fluid.
In this embodiment, the control device may preset different temperature difference thresholds for different usage environments.
The adjustment method of the electric pile inlet temperature adjustment system provided in this embodiment corresponds to two adjustment steps: working condition 1: when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold, the following is exemplified: when the actual temperature of the mixed circulating cooling liquid is detected to be 54 ℃, the theoretical temperature of the theoretical mixed circulating cooling liquid is 56 ℃, the preset temperature difference threshold is 2 ℃, namely, the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is 2 ℃, which is equal to the preset temperature difference threshold, the weighted average calculation is carried out on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid, so that the average temperature of the mixed circulating cooling liquid is 55 ℃, the inlet temperature of the cell stack 100 can be better obtained, and the adjusting mechanism 300 and the hydraulic pump 600 can be correspondingly controlled by utilizing the temperature; the working conditions when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than the preset temperature difference threshold value are the same as the above example process, and will not be repeated here.
Working condition 2: when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold, the following is exemplified: when the actual temperature of the mixed circulating cooling liquid is detected to be 53 ℃, the theoretical temperature of the circulating cooling liquid after theoretical mixing is 56 ℃, the preset temperature difference threshold is 2 ℃, namely, the temperature difference between the actual temperature of the circulating cooling liquid after mixing and the theoretical temperature of the circulating cooling liquid after mixing is 3 ℃ and is larger than the preset temperature difference threshold, in order to avoid the situation that the actual temperature of the circulating cooling liquid after mixing is unevenly mixed, the actually detected temperature information is inaccurate, only the theoretical temperature of the circulating cooling liquid after mixing is adopted as the inlet temperature of the battery stack 100, and the temperature can be correspondingly used for controlling the regulating mechanism 300 and the hydraulic pump 600, so that the situation that the regulating mechanism 300 is frequently regulated and errors are caused is avoided; the technical problems that the detected temperature fluctuation of the mixed circulating cooling liquid is large, the pressure fluctuation in the whole circulating path is large, the pressure difference with the hydrogen/air side is overlarge, and the conveying of the circulating cooling liquid of the battery stack 100 is affected due to the fact that the mixing of the circulating cooling liquid is uneven in the prior art are solved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (9)
1. A stack inlet temperature regulation system, comprising: the device comprises a battery stack, a first temperature detection mechanism, an adjusting mechanism, a heat dissipation mechanism, a second temperature detection mechanism and a control device;
the outlet of the battery pile is respectively communicated with the regulating mechanism and the heat dissipation mechanism, and the battery pile is used for respectively conveying initial circulating cooling liquid to the regulating mechanism and the heat dissipation mechanism;
the adjusting mechanism is communicated with the heat dissipation mechanism, the heat dissipation mechanism is used for conveying cooled circulating cooling liquid to the adjusting mechanism, the adjusting mechanism is communicated with an inlet of the battery stack, and the adjusting mechanism is used for adjusting the mixing of the initial circulating cooling liquid and the cooled circulating cooling liquid and then conveying the mixed circulating cooling liquid into the battery stack;
the first temperature detection mechanism and the second temperature detection mechanism are respectively connected with the control device in an electric signal manner, and the first temperature detection mechanism is positioned at the outlet position of the battery pile and is used for detecting the temperature of the initial circulating cooling liquid output by the battery pile and transmitting the temperature information of the initial circulating cooling liquid to the control device;
the second temperature detection mechanism is positioned between the heat dissipation mechanism and the adjusting mechanism and is used for detecting the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism and transmitting the cooled circulating cooling liquid temperature information to the control device;
the control device is in electrical signal connection with the regulating mechanism and is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid so as to obtain theoretical temperature information of the circulating cooling liquid mixed by the regulating mechanism, and the control device is used for correspondingly controlling the opening of the regulating mechanism to the heat dissipation mechanism according to the theoretical temperature of the circulating cooling liquid mixed by the regulating mechanism;
the device also comprises a third temperature detection mechanism; the third temperature detection mechanism is electrically connected with the control device, is located at an inlet position of the battery stack and is used for detecting actual temperature information of mixed circulating cooling liquid entering the battery stack, and conveying the actual temperature information of the mixed circulating cooling liquid to the control device, and the control device is used for carrying out weighted average calculation on theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid so as to obtain average temperature information of the mixed circulating cooling liquid, and is used for correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the average temperature of the mixed circulating cooling liquid.
2. The stack inlet temperature regulation system of claim 1, further comprising a hydraulic pump;
the hydraulic pump is positioned at the outlet of the battery pile, is respectively communicated with the heat dissipation mechanism and the regulating mechanism, and is used for respectively conveying initial circulating cooling liquid to the heat dissipation mechanism and the regulating mechanism.
3. The stack inlet temperature adjustment system according to claim 2, wherein the hydraulic pump is electrically connected to the control device, and the control device is configured to adjust the delivery flow rate of the hydraulic pump in response to a temperature difference between an average temperature of the mixed circulating coolant and a temperature of the initial circulating coolant.
4. The stack inlet temperature regulation system of claim 3 wherein the regulation mechanism comprises a thermostat;
the thermostat is provided with a first inlet and a second inlet, the thermostat is communicated with the heat dissipation mechanism through the first inlet, the thermostat is communicated with the hydraulic pump through the second inlet, and the sum of the opening of the thermostat to the heat dissipation mechanism and the opening of the thermostat to the hydraulic pump is 1.
5. A regulating method based on the stack inlet temperature regulating system according to any one of claims 1 to 4, characterized by comprising the steps of:
detecting outlet temperature information of initial circulating cooling liquid of the battery stack;
detecting the temperature of the circulating cooling liquid after the initial circulating cooling liquid is cooled by the heat dissipation mechanism;
calculating the temperature of the initial circulating cooling liquid and the temperature of the cooled circulating cooling liquid to obtain theoretical temperature information of the circulating cooling liquid after mixing the initial circulating cooling liquid and the cooled circulating cooling liquid;
and correspondingly controlling the opening degree of the regulating mechanism to the heat radiation mechanism according to the theoretical temperature of the mixed circulating cooling liquid.
6. The method of claim 5, wherein the step of calculating the initial circulating coolant temperature and the cooled circulating coolant temperature further comprises:
temperature after mixing: t (T) 3 ＝T 1 *r+T 2 *(1-r)；
Wherein T is 1 The temperature of the cooled circulating cooling liquid; t (T) 2 Is the temperature of the initial circulating cooling liquid; r is the opening degree of the heat radiation mechanism conveyed to the adjusting mechanism; and 1-r is the opening degree of the battery pile conveyed to the regulating mechanism.
7. The method according to claim 6, wherein the step of correspondingly controlling the opening degree of the heat radiation mechanism by the adjustment mechanism according to the theoretical temperature of the mixed circulating coolant further comprises:
detecting actual temperature information of the mixed circulating cooling liquid entering the battery stack;
comparing the actual temperature of the mixed circulating cooling liquid with the theoretical temperature of the mixed circulating cooling liquid to obtain a temperature difference;
and correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the temperature difference.
8. The method of claim 7, wherein the step of correspondingly controlling the opening degree of the adjusting mechanism to the heat radiation mechanism according to the temperature difference further comprises:
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the opening of the heat dissipation mechanism by the regulating mechanism according to the average temperature of the mixed circulating cooling liquid;
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is higher than a preset temperature difference threshold value, the opening degree of the heat dissipation mechanism by the adjusting mechanism is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
9. The method of adjusting a stack inlet temperature adjustment system according to claim 8, further comprising the steps of:
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is lower than or equal to a preset temperature difference threshold value, carrying out weighted average calculation on the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and correspondingly controlling the conveying flow of the hydraulic pump at the outlet position of the cell stack according to the average temperature of the mixed circulating cooling liquid;
when the temperature difference between the actual temperature of the mixed circulating cooling liquid and the theoretical temperature of the mixed circulating cooling liquid is higher than a preset temperature difference threshold value, the conveying flow of the hydraulic pump at the outlet position of the battery stack is correspondingly controlled according to the theoretical temperature of the mixed circulating cooling liquid.
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| JP2006244962A (en) * | 2005-03-07 | 2006-09-14 | Nissan Motor Co Ltd | Fuel cell system |
| JP2017212093A (en) * | 2016-05-25 | 2017-11-30 | 株式会社デンソー | Cooling system |
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| CN113258097B (en) * | 2021-04-22 | 2022-05-20 | 四川荣创新能动力系统有限公司 | Control method of marine hydrogen fuel cell cooling system |
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| JP2003017105A (en) * | 2001-07-04 | 2003-01-17 | Honda Motor Co Ltd | Cooling device for fuel cell |
| CN110649281A (en) * | 2019-09-30 | 2020-01-03 | 西安新衡科测控技术有限责任公司 | HT-PEM methanol-water fuel cell cooling liquid circulation control system and control method |
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