CN113745570A - 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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- CN113745570A CN113745570A CN202111054976.3A CN202111054976A CN113745570A CN 113745570 A CN113745570 A CN 113745570A CN 202111054976 A CN202111054976 A CN 202111054976A CN 113745570 A CN113745570 A CN 113745570A
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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
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- H—ELECTRICITY
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- 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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- H01M8/00—Fuel cells; Manufacture thereof
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- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
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Abstract
The invention provides a system and a method for regulating the temperature of an inlet of a galvanic pile, which relate to the technical field of combustion battery equipment and comprise a battery galvanic pile, a first temperature detection mechanism, a regulating mechanism, a heat dissipation mechanism, a second temperature detection mechanism and a control device; the circulating cooling liquid at the outlet of the cell stack is divided into two circulating paths, one circulating cooling liquid is directly positioned at the position of the adjusting mechanism, the other circulating cooling liquid is subjected to heat dissipation and cooling through the heat dissipation mechanism, the two circulating cooling liquids with different temperatures are detected, the theoretical temperature of the mixed circulating cooling liquid is obtained, the opening degree of the adjusting mechanism to the heat dissipation mechanism is controlled by the theoretical temperature, the theoretical temperature of the mixed circulating cooling liquid is close to the preset temperature, the technical problems that the circulating cooling liquid is not uniformly mixed in the prior art, the detected 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 cell stack is influenced are solved.
Description
Technical Field
The invention relates to the technical field of combustion battery equipment, in particular to a system and a method for regulating the temperature of an inlet of a galvanic pile.
Background
In the control process of the fuel cell system, the circulating cooling liquid in the cell stack can be subjected to temperature reduction treatment by two circulating paths, and the cooled circulating cooling liquid is returned to the interior of the cell stack.
In the prior art, in a normal operating state of a fuel cell system, the flow rates of the circulating coolants in the two circulating paths are adjusted according to the power of the cell stack and the use of the circulating coolants, that is, after the circulating coolants in the two circulating paths converge to a thermostat, the flow rates of the two circulating paths are controlled by the opening degree of the thermostat to adjust the outlet temperature of the cell stack.
However, in the thermostat of the related art, the opening degree is adjusted according to the actual temperature of the inlet and outlet of the cell stack, but since the thermostat mixes the circulating coolant in two different circulation paths in two temperature states, when the circulating coolant in the two temperature states is not mixed uniformly, the actually detected temperature fluctuation of the mixed circulating coolant is often large, but when the inlet temperature fluctuation of the cell stack is large, the adjusting mechanism adjusts the temperature information according to the current temperature, so that the pressure fluctuation in the whole circulation path is large, and the pressure difference from the hydrogen/air side pressure is too large, which affects the delivery of the circulating coolant of the cell stack.
Disclosure of Invention
The invention aims to provide a system and a method for regulating the inlet temperature of a galvanic pile, which are used for solving the technical problems that the circulating cooling liquid is not uniformly mixed, the detected temperature fluctuation of the circulating cooling liquid after mixing is large, the pressure fluctuation in the whole circulating path is large, the pressure difference between the pressure of the circulating cooling liquid and the hydrogen/air side is too large, and the conveying of the circulating cooling liquid of the galvanic pile is influenced in the prior art.
The invention provides a temperature regulating system for an inlet of a galvanic pile, which comprises: the device comprises a battery pile, 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 electric pile is respectively communicated with the adjusting mechanism and the heat dissipation mechanism, and the battery electric pile is used for respectively conveying initial circulating cooling liquid to the adjusting 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 cell 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 mixture into the cell stack;
the first temperature detection mechanism and the second temperature detection mechanism are respectively in electrical signal connection with the control device, and the first temperature detection mechanism is located at an outlet of the cell stack and is used for detecting the temperature of initial circulating cooling liquid output by the cell stack 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 temperature information of the cooled circulating cooling liquid to the control device;
the control device is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the circulating cooling liquid after cooling to obtain theoretical temperature information of the circulating cooling liquid after the adjusting mechanism is mixed, and the control device is used for correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the theoretical temperature of the circulating cooling liquid after mixing.
In the preferred embodiment of the invention, the device further comprises a hydraulic pump;
the hydraulic pump is located at an outlet of the battery electric pile, the hydraulic pump is respectively communicated with the heat dissipation mechanism and the adjusting mechanism, and the hydraulic pump is used for respectively conveying initial circulating cooling liquid to the heat dissipation mechanism and the adjusting mechanism.
In a preferred embodiment of the present invention, the apparatus further comprises a third temperature detection mechanism;
the third temperature detection mechanism is electrically connected with the control device, the third temperature detection mechanism is located at an inlet of the cell stack and used for detecting actual temperature information of mixed circulating cooling liquid entering the cell stack and conveying the actual temperature information of the mixed circulating cooling liquid to the control device, the control device is used for performing weighted average calculation on theoretical temperature of the mixed circulating cooling liquid and actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and the control device is used for correspondingly controlling the opening degree of 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 rate of the hydraulic pump according to a temperature difference between the average temperature of the mixed circulating cooling fluid and the temperature of the initial circulating cooling fluid.
In a preferred embodiment of the invention, the adjustment mechanism comprises a thermostat;
the thermostat has first import and second import, the thermostat pass through first import with heat dissipation mechanism intercommunication, the thermostat pass through the second import with the hydraulic pump intercommunication, the thermostat is right heat dissipation mechanism's aperture with right the sum of the aperture of 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 cell 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 obtained by mixing the initial circulating cooling liquid and the cooled circulating cooling liquid;
and correspondingly controlling the opening of the regulating mechanism to the heat dissipation 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 temperature of 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 coolant; r is the opening degree of the heat dissipation mechanism to the adjusting mechanism; and 1-r is the opening degree of the cell stack for conveying 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 cell 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 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 dissipating 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, performing 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 degree of the regulating mechanism on the heat dissipation mechanism according to the average temperature of the mixed circulating cooling liquid;
and 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, correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the method further comprises the following steps:
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, performing 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 delivery flow of a hydraulic pump at the outlet position of the cell stack according to the average temperature of the mixed circulating cooling liquid;
and 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, correspondingly controlling the delivery flow of the hydraulic pump at the outlet position of the cell stack according to the theoretical temperature of the mixed circulating cooling liquid.
The invention provides a temperature regulating system for an inlet of a galvanic pile, which comprises: the device comprises a battery pile, 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 electric pile is respectively communicated with the adjusting mechanism and the heat dissipation mechanism, and the battery electric pile is used for respectively conveying the initial circulating cooling liquid to the adjusting 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 cell stack, and the adjusting mechanism is used for adjusting the initial circulating cooling liquid and the cooled circulating cooling liquid to be mixed and then conveyed into the battery cell stack; the first temperature detection mechanism and the second temperature detection mechanism are respectively in electric signal connection with the control device, and the first temperature detection mechanism is positioned at the outlet of the cell stack and used for detecting the temperature of initial circulating cooling liquid output by the cell stack 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 temperature information of the circulating cooling liquid cooled by the heat dissipation mechanism to the control device; the control device is in electric signal connection with the adjusting mechanism, 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, and is used for correspondingly controlling the opening of the adjusting mechanism to the heat dissipation mechanism according to the theoretical temperature of the mixed circulating cooling liquid; the initial temperature of the circulating cooling liquid at the outlet of the cell stack can be detected by utilizing the first temperature detection mechanism, the circulating cooling liquid at the outlet of the cell stack is divided into two circulating paths, one circulating cooling liquid is directly conveyed to the position of the adjusting mechanism, the other circulating cooling liquid is conveyed to the 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 cell stack at the adjusting mechanism according to the preset proportion of the adjusting mechanism, it needs 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 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 problem that the circulating cooling liquid in the prior art is not uniformly mixed, and the detected temperature fluctuation of the mixed circulating cooling liquid is large is solved, leading to the technical problem that the pressure fluctuation in the whole circulation path is large, causing the pressure difference with the hydrogen/air side to be too large, and influencing the circulating cooling liquid delivery of the cell stack.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
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-a hydraulic pump; 700-third temperature detection mechanism.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a system for regulating the inlet temperature of a stack, including: the device comprises a battery cell stack 100, a first temperature detection mechanism 200, an adjusting mechanism 300, a heat dissipation mechanism 400, a second temperature detection mechanism 500 and a control device; the outlet of the battery electric pile 100 is respectively communicated with the adjusting mechanism 300 and the heat dissipation mechanism 400, and the battery electric pile 100 is used for respectively conveying initial circulating cooling liquid to the adjusting 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 an inlet of the cell stack 100, and the adjusting mechanism 300 is used for adjusting the initial circulating cooling liquid and the cooled circulating cooling liquid to be mixed and then conveyed into the cell stack 100; the first temperature detection mechanism 200 and the second temperature detection mechanism 500 are respectively in electrical signal connection with the control device, the first temperature detection mechanism 200 is located at the outlet position of the cell stack 100 and is used for detecting the temperature of the initial circulating cooling liquid output by the 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 transmit information of the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism 400 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 the control device is used for correspondingly controlling the opening of the adjusting mechanism 300 on the heat dissipation mechanism 400 according to the theoretical temperature of the mixed circulating cooling liquid.
It should be noted that, the stack inlet temperature adjustment system provided in this embodiment changes the heat dissipation adjustment condition of the circulating coolant inside the battery stack 100 in the prior art, that is, changes the temperature detection of the positions of the inlet and outlet of the battery stack 100, and only detects the actual temperature of the circulating coolant at the outlet of the battery stack 100 and the actual temperature information of the circulating coolant after heat dissipation, because the temperature information obtained by the first temperature detection mechanism 200 and the second temperature detection mechanism 500 is the temperature information of the circulating coolant under a single condition, that is, after the circulating coolant in the two temperature states is mixed in the opening ratio of the adjustment mechanism 300, to avoid the temperature of the circulating coolant after mixing from being mixed unevenly and causing detection errors, the temperature information obtained by the first temperature detection mechanism 200 and the second temperature detection mechanism 500 is used for calculation, theoretical temperature information of the mixed circulating cooling liquid is obtained, the opening degree of the adjusting mechanism 300 to the heat dissipation mechanism 400 is correspondingly controlled through the calculated theoretical temperature of the mixed circulating cooling liquid, and the situation that the adjusting mechanism 300 is frequently adjusted to cause errors due to uneven mixing of the circulating cooling liquid in two temperature states is avoided.
In this embodiment, the temperature of the initial circulating cooling liquid and the temperature of the circulating cooling liquid after temperature reduction 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 coolant; r is the opening degree of the heat dissipation mechanism 400 to the adjustment mechanism 300; 1-r is the opening degree of the cell stack 100 to the adjustment mechanism 300.
It should be noted that, without considering the heat loss of the pipe, the theoretical temperature information of the mixed circulating cooling liquid delivered by the adjusting mechanism 300 at the opening ratio of the adjusting mechanism 300 is the sum of the temperature of the initial circulating cooling liquid multiplied by the opening ratio of the corresponding adjusting mechanism 300 and the temperature of the cooled circulating cooling liquid multiplied by the opening ratio of the corresponding adjusting mechanism 300; wherein, when the opening r of the heat dissipation mechanism 400 for conveying to the adjustment mechanism 300 is preset, the theoretical temperature T3 of the mixed circulating cooling liquid can be calculated; when the inlet temperature of the cell stack 100 is preset, that is, the theoretical temperature T3 of the mixed circulating coolant is known, and the opening degree r information to be sent from the heat radiation mechanism 400 to the adjustment mechanism 300 is calculated from the detected T1 and T2.
Alternatively, the first temperature detection mechanism 200 and the second temperature detection mechanism 500 may be temperature sensors, and the control device may be various, for example: MCU, computer, PLC controller etc. preferably, the controlling means is MCU. A Micro Control Unit (MCU), also called a single-chip microcomputer or a single-chip microcomputer, is a computer that properly reduces the frequency and specification of a central processing Unit, and integrates peripheral interfaces such as a memory, a counter, a USB, an a/D conversion, a UART, a PLC, a DMA, and the like, even an LCD driving circuit, on a single chip to form a chip-level computer, which is used for different combined control in different application occasions.
Preferably, the control device can adopt an STM32F103C8T6 single chip microcomputer, and the control device can also adopt PLC control, which is not described herein again.
The embodiment provides a galvanic pile inlet temperature governing system, includes: the device comprises a battery cell stack 100, a first temperature detection mechanism 200, an adjusting mechanism 300, a heat dissipation mechanism 400, a second temperature detection mechanism 500 and a control device; the outlet of the battery electric pile 100 is respectively communicated with the adjusting mechanism 300 and the heat dissipation mechanism 400, and the battery electric pile 100 is used for respectively conveying initial circulating cooling liquid to the adjusting 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 an inlet of the cell stack 100, and the adjusting mechanism 300 is used for adjusting the initial circulating cooling liquid and the cooled circulating cooling liquid to be mixed and then conveyed into the cell stack 100; the first temperature detection mechanism 200 and the second temperature detection mechanism 500 are respectively in electrical signal connection with the control device, the first temperature detection mechanism 200 is located at the outlet position of the cell stack 100 and is used for detecting the temperature of the initial circulating cooling liquid output by the 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 transmit information of the temperature of the circulating cooling liquid cooled by the heat dissipation mechanism 400 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 adjusting mechanism 300 to the heat dissipation mechanism 400 according to the theoretical temperature of the mixed circulating cooling liquid; the first temperature detection mechanism 200 can detect and obtain 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 adjusting mechanism 300, the other circulating cooling liquid is conveyed to the position of the heat dissipation mechanism 400 for heat dissipation and cooling, the two circulating cooling liquids with different temperatures are mixed and flow back to the position of the cell stack 100 at the adjusting mechanism 300 according to the proportion preset by the adjusting mechanism 300, it should 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 adjusting mechanism 300 to the heat dissipation mechanism 400 can be controlled, the theoretical temperature of the mixed circulating cooling liquid is ensured to be close to the preset temperature, and the non-uniform mixing of the circulating cooling liquid in the prior art is alleviated, the detected temperature fluctuation of the mixed circulating cooling liquid is large, the pressure fluctuation in the whole circulating path is large, and the pressure difference with the hydrogen/air side pressure is overlarge, thereby influencing the circulating cooling liquid conveying of the battery electric pile 100.
On the basis of the above embodiments, further, in the preferred embodiment of the present invention, the hydraulic pump 600 is further included; the hydraulic pump 600 is located at an outlet of the cell 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 initially circulated coolant to the heat dissipation mechanism 400 and the adjustment mechanism 300.
In this embodiment, the hydraulic pump 600 can deliver the circulating coolant at the outlet of the cell stack 100 to the adjusting mechanism 300 and the heat dissipating mechanism 400, respectively, that is, the hydraulic pump 600 can control the flow rate and the flow rate of the initial circulating coolant, wherein the hydraulic pump 600 is adjusted by the temperature difference between the mixed circulating coolant and the initial circulating coolant, and when the temperature of the mixed circulating coolant fluctuates greatly, that is, when the temperature change range of the mixed circulating coolant is large, the hydraulic pump 600 is also adjusted frequently, that is, frequent adjustment of the hydraulic pump 600 also causes the pressure fluctuation to be large, which results in an excessive pressure difference with the hydrogen/air side pressure; the embodiment provides the temperature that utilizes the theoretical temperature of the recirculated cooling liquid that has mixed as the recirculated cooling liquid of battery galvanic pile 100 entry position department, has guaranteed the temperature stability of the recirculated cooling liquid after mixing, can guarantee that the temperature difference of the recirculated cooling liquid of battery galvanic pile 100 access & exit is steady state promptly, has avoided frequent regulation of hydraulic pump 600, has solved the too big problem of recirculated cooling liquid and hydrogen/empty side pressure differential that battery galvanic pile 100 entry temperature frequent fluctuation leads to, has improved hydraulic pump 600's life.
In the preferred embodiment of the present invention, a third temperature detecting mechanism 700 is further included; the third temperature detecting mechanism 700 is electrically connected to the control device, the third temperature detecting mechanism 700 is located at an inlet of the electric cell stack 100, and is configured to detect actual temperature information of the mixed circulating cooling fluid entering the electric cell stack 100, and transmit the actual temperature information of the mixed circulating cooling fluid to the control device, the control device is configured to perform weighted average calculation on a theoretical temperature of the mixed circulating cooling fluid and an actual temperature of the mixed circulating cooling fluid, so as to obtain average temperature information of the mixed circulating cooling fluid, and the control device is configured to correspondingly control an opening degree of the adjusting mechanism 300 to the heat dissipation mechanism 400 according to the average temperature of the mixed circulating cooling fluid.
In the preferred embodiment of the present invention, the hydraulic pump 600 is electrically connected to a control device for adjusting the delivery rate of the hydraulic pump 600 according to the temperature difference between the average temperature of the mixed circulating coolant and the temperature of the initial circulating coolant.
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 cell stack 100 to obtain the actual temperature information of the mixed circulating cooling liquid; the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid are weighted and averaged to obtain the average temperature information of the mixed circulating cooling liquid, the theoretical temperature of the mixed circulating cooling liquid and the actual temperature of the mixed circulating cooling liquid are weighted and averaged, the obtained temperature can be better close 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 practical service life of the adjusting mechanism 300 or the hydraulic pump 600 is prevented from being influenced, the use of the circulating cooling liquid in the cell stack 100 is influenced, the cell stack 100 is cooled abnormally, and the possibility that the temperature of the fuel cell is too high or too low is avoided; alternatively, the third temperature detection mechanism 700 may be a temperature sensor.
Average temperature of 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 recirculated coolant.
In the preferred embodiment of the present invention, the adjustment mechanism 300 includes a thermostat; the thermostat has first import and second import, and the thermostat passes through first import and heat dissipation mechanism 400 intercommunication, and the thermostat passes through the second import and communicates with hydraulic pump 600, and the thermostat is 1 to the total of the aperture of heat dissipation mechanism 400 and the aperture to hydraulic pump 600.
Optionally, the thermostat is a valve that controls a coolant flow path; is a thermostat, usually comprising a temperature sensing element that opens and closes the flow of air, gas or liquid by thermal expansion or contraction. In this embodiment, can utilize the aperture of predetermined temperature control flow to the temperature saver to adjust through utilizing temperature saver and predetermined controlling means signal of telecommunication to can guarantee that under different work condition, the temperature of the entry position of cell stack 100 is in predetermined temperature range.
The adjusting method based on the stack inlet temperature adjusting system provided by the embodiment comprises the following steps: detecting outlet temperature information of the initially circulated coolant of the cell stack 100; detecting the temperature of the circulating cooling liquid after the initial circulating cooling liquid is cooled by the heat dissipation 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 obtained by mixing the initial circulating cooling liquid and the cooled circulating cooling liquid; the opening degree of the regulating mechanism 300 to the heat dissipation mechanism 400 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 temperature of 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 coolant; r is the opening degree of the heat dissipation mechanism 400 to the adjustment mechanism 300; 1-r is the opening degree of the cell stack 100 to the adjustment mechanism 300.
In this embodiment, the circulating cooling liquid that does not pass through the heat dissipation mechanism 400 flows in a small circulation manner, and the circulating cooling liquid that is subjected to heat dissipation and temperature reduction by the heat dissipation mechanism 400 flows in a large circulation manner, and because the proportions of the circulating cooling liquid that flows in a large circulation manner and the circulating cooling liquid that flows in a small circulation manner and is discharged by the adjustment mechanism 300 are different, the more accurate theoretical temperature of the mixed circulating cooling liquid can be obtained through calculation;
the calculation is as follows:
m 1: the mass of the circulating coolant passing through the heat dissipation mechanism 400; m 2: the mass of the circulating coolant delivered directly to the location of the regulating mechanism 300; m 3: the total mass of the mixed circulating cooling liquid;
cmT according to the heat calculation formula Q
The following can be obtained: q1-cm 1T1, Q2-cm 2T2
The total mass is as follows: m3 ═ m1+ m2
The thermostat opening is r, so: m1 ═ m3 ═ m2 ═ m3 ═ 1-r)
The post-mixing temperature 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 adjusting mechanism 300 according to the opening proportion of the adjusting mechanism 300 is the sum of the temperature of the initial circulating cooling liquid multiplied by the proportion corresponding to the opening of the adjusting mechanism 300 and the temperature of the cooled circulating cooling liquid multiplied by the proportion corresponding to the opening of the adjusting mechanism 300; wherein, when the opening r of the heat dissipation mechanism 400 for conveying to the adjustment mechanism 300 is preset, the theoretical temperature T3 of the mixed circulating cooling liquid can be calculated; when the inlet temperature of the cell stack 100 is preset, that is, the theoretical temperature T3 of the mixed circulating coolant is known, and the opening degree r information to be sent from 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 comprises: detecting actual temperature information of the mixed circulating coolant entering the cell 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 dissipating 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 the preset temperature difference threshold value, performing 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 correspondingly controlling the opening of the adjusting mechanism 300 on the heat dissipation mechanism 400 according to the average temperature of the mixed circulating cooling liquid; and 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, correspondingly controlling the opening degree of the adjusting mechanism 300 on the heat dissipation mechanism 400 according to the theoretical temperature of the mixed circulating cooling liquid.
In a preferred embodiment of the present invention, the method further comprises the following steps: 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, performing 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 delivery flow rate 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; and 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, correspondingly controlling the delivery flow rate of the hydraulic pump 600 at the outlet position of the cell stack 100 according to the theoretical temperature of the mixed circulating cooling liquid.
In this embodiment, the control device may preset different temperature difference thresholds for different use environments.
The adjusting method of the temperature adjusting system at the inlet of the galvanic pile provided by the embodiment corresponds to two adjusting 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 the preset temperature difference threshold, the following steps are taken as examples: when the actual temperature of the mixed circulating cooling liquid is detected to be 54 ℃, the theoretical temperature of the theoretically mixed circulating cooling liquid is detected to be 56 ℃, and the preset temperature difference threshold value 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 ℃ and is equal to the preset temperature difference threshold value, 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 at the moment to obtain the average temperature of the mixed circulating cooling liquid to be 55 ℃, so that the accurate inlet temperature of the battery 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 condition 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 is the same as the above exemplary process, and details thereof are not 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 the preset temperature difference threshold, the following steps are taken as examples: when the actual temperature of the mixed circulating cooling liquid is detected to be 53 ℃, the theoretical temperature of the theoretically mixed circulating cooling liquid is 56 ℃, and the preset temperature difference threshold value 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 3 ℃ and is larger than the preset temperature difference threshold value, in order to avoid the situation that the actual temperature of the mixed circulating cooling liquid is not uniformly mixed and actual detected temperature information is inaccurate, only the theoretical temperature of the mixed circulating cooling liquid is used as the inlet temperature of the battery cell stack 100, the adjusting mechanism 300 and the hydraulic pump 600 can be correspondingly controlled by using the temperature, and the situation that the circulating cooling liquid is not uniformly mixed in two temperature states, the adjusting mechanism 300 is frequently adjusted, and errors are caused is avoided; the technical problems that the circulating cooling liquid is not uniformly mixed, 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 between the pressure difference and the hydrogen/air side pressure is overlarge, and the conveying of the circulating cooling liquid of the battery electric pile 100 is influenced in the prior art are solved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A stack inlet temperature regulation system, comprising: the device comprises a battery pile, 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 electric pile is respectively communicated with the adjusting mechanism and the heat dissipation mechanism, and the battery electric pile is used for respectively conveying initial circulating cooling liquid to the adjusting 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 cell 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 mixture into the cell stack;
the first temperature detection mechanism and the second temperature detection mechanism are respectively in electrical signal connection with the control device, and the first temperature detection mechanism is located at an outlet of the cell stack and is used for detecting the temperature of initial circulating cooling liquid output by the cell stack 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 temperature information of the cooled circulating cooling liquid to the control device;
the control device is used for calculating the temperature of the initial circulating cooling liquid and the temperature of the circulating cooling liquid after cooling to obtain theoretical temperature information of the circulating cooling liquid after the adjusting mechanism is mixed, and the control device is used for correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the theoretical temperature of the circulating cooling liquid after mixing.
2. The stack inlet temperature regulation system according to claim 1, further comprising a hydraulic pump;
the hydraulic pump is located at an outlet of the battery electric pile, the hydraulic pump is respectively communicated with the heat dissipation mechanism and the adjusting mechanism, and the hydraulic pump is used for respectively conveying initial circulating cooling liquid to the heat dissipation mechanism and the adjusting mechanism.
3. The stack inlet temperature regulation system according to claim 2, further comprising a third temperature detection mechanism;
the third temperature detection mechanism is electrically connected with the control device, the third temperature detection mechanism is located at an inlet of the cell stack and used for detecting actual temperature information of mixed circulating cooling liquid entering the cell stack and conveying the actual temperature information of the mixed circulating cooling liquid to the control device, the control device is used for performing weighted average calculation on theoretical temperature of the mixed circulating cooling liquid and actual temperature of the mixed circulating cooling liquid to obtain average temperature information of the mixed circulating cooling liquid, and the control device is used for correspondingly controlling the opening degree of the heat dissipation mechanism according to the average temperature of the mixed circulating cooling liquid.
4. The system according to claim 3, wherein the hydraulic pump is electrically connected to the control means for adjusting the delivery rate of the hydraulic pump in response to the temperature difference between the average temperature of the mixed circulating coolant and the temperature of the initial circulating coolant.
5. The stack inlet temperature regulation system according to claim 4, wherein the regulation mechanism comprises a thermostat;
the thermostat has first import and second import, the thermostat pass through first import with heat dissipation mechanism intercommunication, the thermostat pass through the second import with the hydraulic pump intercommunication, the thermostat is right heat dissipation mechanism's aperture with right the sum of the aperture of hydraulic pump is 1.
6. A regulation method based on the cell stack inlet temperature regulation system according to any one of claims 1 to 5, characterized by comprising the following steps:
detecting outlet temperature information of initial circulating cooling liquid of the cell 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 obtained by mixing the initial circulating cooling liquid and the cooled circulating cooling liquid;
and correspondingly controlling the opening of the regulating mechanism to the heat dissipation mechanism according to the theoretical temperature of the mixed circulating cooling liquid.
7. The method for regulating a cell stack inlet temperature regulation system according to claim 6, wherein the step of calculating the initial circulating coolant temperature and the reduced circulating coolant temperature further comprises:
temperature after mixing: t is3＝T1*r+T2*(1-r)；
Wherein, T1The temperature of the cooled circulating cooling liquid is adopted; t is2Is the temperature of the initial circulating cooling liquid; r is the opening degree of the heat dissipation mechanism to the adjusting mechanism; and 1-r is the opening degree of the cell stack for conveying to the regulating mechanism.
8. The method for adjusting the inlet temperature regulating system of the electric pile according to claim 7, wherein the step of correspondingly controlling the opening degree of the regulating mechanism to the heat dissipation mechanism according to the theoretical temperature of the mixed circulating cooling liquid further comprises the following steps:
detecting actual temperature information of the mixed circulating cooling liquid entering the cell 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 of the adjusting mechanism to the heat dissipation mechanism according to the temperature difference.
9. The method for adjusting the stack inlet temperature adjustment system according to claim 8, wherein the step of controlling the opening degree of the adjustment mechanism to the heat dissipation 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, performing 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 degree of the regulating mechanism on the heat dissipation mechanism according to the average temperature of the mixed circulating cooling liquid;
and 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, correspondingly controlling the opening degree of the adjusting mechanism to the heat dissipation mechanism according to the theoretical temperature of the mixed circulating cooling liquid.
10. The method for regulating a stack inlet temperature regulation system according to claim 9, 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, performing 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 delivery flow of a hydraulic pump at the outlet position of the cell stack according to the average temperature of the mixed circulating cooling liquid;
and 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, correspondingly controlling the delivery flow of the hydraulic pump at the outlet position of the cell stack according to the theoretical temperature of the mixed circulating cooling liquid.
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