CN107681223B - Lithium battery preheating and heat dissipation system utilizing two-phase flow power type separated heat pipe - Google Patents
Lithium battery preheating and heat dissipation system utilizing two-phase flow power type separated heat pipe Download PDFInfo
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- CN107681223B CN107681223B CN201710809905.7A CN201710809905A CN107681223B CN 107681223 B CN107681223 B CN 107681223B CN 201710809905 A CN201710809905 A CN 201710809905A CN 107681223 B CN107681223 B CN 107681223B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 102
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 102
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 22
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 10
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000036760 body temperature Effects 0.000 claims description 10
- 239000004519 grease Substances 0.000 claims description 6
- 229920001296 polysiloxane Polymers 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000002687 intercalation Effects 0.000 description 1
- 238000009830 intercalation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6552—Closed pipes transferring heat by thermal conductivity or phase transition, e.g. heat pipes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Automation & Control Theory (AREA)
Abstract
The application discloses a lithium battery preheating and radiating system utilizing a two-phase flow power type separated heat pipe, which relates to the technical field of battery heat management and comprises a lithium battery unit, a heat pipe working medium circulating pipeline, a central controller, a self-circulating heat pipe electromagnetic valve, a heat conversion unit and a power unit. The application has the beneficial effects that the use safety and the heat dissipation effect of the lithium battery are improved, the problem of low performance of the lithium battery in low-temperature operation is solved, and the service life of the lithium battery is further prolonged.
Description
Technical Field
The application relates to the technical field of battery thermal management, in particular to a lithium battery preheating and radiating system utilizing a two-phase flow power type separated heat pipe.
Background
The lithium battery generates heat during working, and the surface temperature of the lithium battery can reach 50-60 ℃ under the normal working state; particularly, in the case of discharging and charging with a large current, the heat generation phenomenon is particularly serious, and even a thermal runaway phenomenon occurs. The heat generation will lead to reduced performance and life of the lithium battery, and more serious will lead to damage and even explosion of the lithium battery. Most of the existing cooling methods are ventilation and heat removal, and have the defects of low heat transfer efficiency and easiness in accumulating dust; the battery heat exchanger composed of the single heat pipes is not easy to overhaul because of compact arrangement, and the failed single heat pipe is difficult to find. Meanwhile, when the motor is started in cold areas or in winter and high-power is required to be input, the temperature of the lithium battery is too low, and the discharge capacity is reduced, so that the instantaneous high-power requirement cannot be met; when large current is charged in a low temperature state, thermal runaway of the lithium battery and even safety accidents can occur due to the fact that the intercalation capability of the negative electrode graphite is reduced. There is little research on the problem of preheating lithium batteries.
Disclosure of Invention
The application aims to solve the problems of safe use, strong heat dissipation effect and energy conservation of a lithium battery, and designs a lithium battery preheating and heat dissipation system utilizing a two-phase flow power type separated heat pipe. The method can keep the interior of the lithium battery unit clean, quickly preheat the lithium battery to a proper temperature before starting the motor or charging, and has proper temperature and uniform temperature field under the normal working state, thereby prolonging the service life of the battery.
The technical scheme of the application for achieving the purpose is that the lithium battery preheating and radiating system utilizing the two-phase flow power type split heat pipe comprises a lithium battery unit, a heat pipe working medium circulating pipeline, a central controller, a self-circulation heat pipe electromagnetic valve, a heat conversion unit and a power unit, wherein the lithium battery unit, the heat conversion unit and the self-circulation heat pipe electromagnetic valve/power unit form a loop through the heat pipe working medium circulating pipeline; the lithium battery unit comprises a lithium battery box body temperature sensor, an internal micro-channel heat pipe heat exchanger and a lithium battery module, and heat conduction silicone grease is filled between the internal micro-channel heat pipe heat exchanger and the lithium battery module; the heat conversion unit comprises an inner heat exchange channel and an outer heat exchange channel, the inner heat exchange channel comprises a phase-change heat accumulator heat pipe electromagnetic valve I, a phase-change heat accumulator and a phase-change heat accumulator heat pipe electromagnetic valve II which are sequentially connected, a phase-change heat accumulator temperature sensor and a phase-change heat accumulator internal heat exchanger are arranged in the phase-change heat accumulator, and the outer heat exchange channel comprises an outer heat exchanger heat pipe electromagnetic valve I, an outer heat exchanger and an outer heat exchanger heat pipe electromagnetic valve II which are sequentially connected; the power unit comprises a four-way reversing valve and a solution pump, wherein two passages of the four-way reversing valve are connected with the solution pump, and the other two passages are respectively connected with the lithium battery unit and the heat conversion unit; the central controller is respectively connected with a lithium battery box body temperature sensor, an external heat exchanger heat pipe electromagnetic valve I, an external heat exchanger heat pipe electromagnetic valve II, a phase change heat accumulator heat pipe electromagnetic valve I, a phase change heat accumulator heat pipe electromagnetic valve II, a phase change heat accumulator temperature sensor I, a self-circulation heat pipe electromagnetic valve, a four-way reversing valve, a solution pump and an external temperature sensor arranged in the air through control and power output lines.
Preferably, the outer heat exchange channel further comprises an outer heat exchanger fan, the outer heat exchanger fan is arranged on the outer side of the outer heat exchanger, and the outer heat exchanger fan is connected with the central controller through a control and power output line.
Preferably, an exhaust dust-proof valve is arranged at the top of the lithium battery unit.
Preferably, the manufacturing materials of the inner microchannel heat pipe heat exchanger, the phase change heat accumulator inner heat exchanger and the outer heat exchanger are aluminum alloy.
The lithium battery preheating and radiating system utilizing the two-phase flow power type split heat pipe, which is manufactured by utilizing the technical scheme of the application, has the beneficial effects that the use safety and the radiating effect of the lithium battery are improved, the problem of low performance of the lithium battery in low-temperature operation is solved, the service life of the lithium battery is further prolonged, and the system is specifically characterized in that:
1. the two-phase flow heat pipe for mass transfer and heat transfer by the gas-liquid two-phase flow state has large energy transmission density, and the required driving force, heat exchange area, heat exchanger volume and connecting pipeline diameter are greatly reduced;
2. the condenser and the evaporator of the separated heat pipe are mutually independent, so that long-distance heat transfer and variable heat transfer directions are realized, each part of the heat pipe system is allowed to be distributed, the space utilization is flexible, and the lithium battery can be preheated by heat transfer and reversing;
3. the power type heat pipe driven by the power of the solution pump can overcome the on-way resistance generated by long-distance conveying of the working medium of the heat pipe at the cost of consuming a small amount of electric energy, so that the problem of insufficient driving force under a small temperature difference is avoided, and the problem of limitation of installation of a condensing section which is only at the high position of an evaporating section and is similar to a gravity type single heat pipe is avoided;
4. the heat exchanger formed by combining a plurality of traditional single heat pipes is very difficult to overhaul and change the single heat pipes, and the two-phase flow power type separated heat pipe system has mature parts like a condenser, an evaporator, a connecting pipeline and the like of a direct expansion refrigeration system, and is convenient to maintain.
Drawings
FIG. 1 is a flow chart of heat dissipation of a lithium battery using a two-phase flow powered split heat pipe;
FIG. 2 is a schematic diagram of the internal cross-section of a lithium battery cell;
fig. 3 is a flow chart of preheating a lithium battery using a two-phase flow power type split heat pipe.
In the above figures, 1, a lithium battery cell; 2. a heat pipe working medium circulating pipeline; 31. a phase change heat accumulator heat pipe electromagnetic valve I; 32. a phase change heat accumulator heat pipe electromagnetic valve II; 41. an external heat exchanger heat pipe electromagnetic valve I; 42. an external heat exchanger heat pipe electromagnetic valve II; 5. a phase change heat accumulator; 6. an external heat exchanger fan; 7. an external heat exchanger; 8. a phase change heat accumulator temperature sensor; 9. a phase change heat accumulator internal heat exchanger; 10. a lithium battery case temperature sensor; 11. a self-circulating heat pipe electromagnetic valve; 12. a four-way reversing valve; 13. a solution pump; 14. a control and power output line; 15. a central controller; 16. an internal microchannel heat pipe heat exchanger; 17. an exhaust dust-proof valve; 18. a lithium battery module; 19. a lithium battery charging and discharging cable; 20. an upper cover of the lithium battery box body; 21. a lithium battery case housing; 22. a heat pipe working medium circulating pipeline interface; 23. heat conductive silicone grease; 24. an external temperature sensor.
Detailed Description
In order to further describe the technical means and effects adopted by the application to achieve the preset aim, the following detailed description is given below of the specific implementation, structure, characteristics and effects according to the application with reference to the accompanying drawings and preferred embodiments:
the application relates to a lithium battery preheating and radiating system utilizing a two-phase flow power type separated heat pipe, which is divided into a lithium battery radiating mode and a lithium battery preheating mode. The system adopts the separated heat pipe with the mutually independent condenser and evaporator, realizes long-distance heat transfer, has variable heat transfer direction, dispersedly arranges all parts of the heat pipe system, has flexible space utilization, and can preheat the lithium battery by heat transfer and reversing; the power type heat pipe driven by the solution pump power can overcome the along-path resistance generated by long-distance conveying of the heat pipe working medium, and avoid the problem of insufficient driving force under small temperature difference; the optimal design and calculation of the heat exchanger pipeline and the working medium filling quantity realize the purpose of high energy transmission density of the two-phase fluid heat transfer of the working medium.
Example 1
As shown in fig. 1 and fig. 2 (taking a plate-shaped lithium battery module as an example), the heat dissipation mode of the lithium battery includes a lithium battery unit 1, a heat pipe working medium circulation pipeline 2, a heat conversion unit, a power unit, a self-circulation heat pipe electromagnetic valve 11, a control and power output line 14 and a central controller 15, wherein the lithium battery unit 1, the heat conversion unit and the self-circulation heat pipe electromagnetic valve 11 form a self-circulation heat exchange loop through the heat pipe working medium circulation pipeline 2; the lithium battery unit 1, the heat conversion unit and the power unit form a power circulation heat exchange loop through a heat pipe working medium circulation pipeline 2.
The lithium battery unit 1 is subjected to sealed dampproof and dustproof design and comprises a lithium battery box body temperature sensor 10, an internal micro-channel heat pipe heat exchanger 16, an exhaust dustproof valve 17, a lithium battery module 18, a lithium battery charging and discharging cable 19, a lithium battery box body upper cover 20, a lithium battery box body shell 21, a heat pipe working medium circulation pipeline interface 22 and heat conduction silicone grease 23, wherein the lithium battery module 18 generates gas, and the gas is discharged through an opening on the lithium battery unit 1, and the exhaust dustproof valve 17 is arranged on the opening to play a dustproof role; the heat conduction silicone grease 23 is filled between the inner micro-channel heat pipe heat exchanger 16 and the lithium battery module 18, and the heat conduction silicone grease 23 has the characteristics of excellent electric insulation and heat conduction performance, and is characterized by non-Newtonian fluid at high temperature, so that gaps between solid wall surfaces can be eliminated, vibration and heat conduction resistance are reduced, electric leakage accidents are avoided, and uniformity of a temperature field in a box is improved. In addition, the micro-channel heat pipe heat exchanger 16 in the lithium battery unit, the phase change heat accumulator and the external heat exchanger 7 adopt parallel multi-path and other optimization designs to reduce flow resistance and form two-phase fluid working media, and are prepared from light, thin and good-heat-conducting materials such as aluminum alloy.
The heat conversion unit comprises an inner heat exchange channel and an outer heat exchange channel, wherein the inner heat exchange channel comprises a phase-change heat accumulator heat pipe electromagnetic valve I31, a phase-change heat accumulator 5 and a phase-change heat accumulator heat pipe electromagnetic valve II 32 which are sequentially connected, and a phase-change heat accumulator temperature sensor 8 is arranged in the phase-change heat accumulator 5; the external heat exchange channel comprises an external heat exchanger heat pipe electromagnetic valve I41, an external heat exchanger 7 and an external heat exchanger heat pipe electromagnetic valve II 42 which are sequentially connected, and because the system adopts a single conveying channel bidirectional passage, the electromagnetic valves are arranged at the two ends, and the control is convenient. In addition, the outer heat exchange path further includes an outer heat exchanger fan 6 disposed outside the outer heat exchanger 7 for improving heat dissipation efficiency.
The power unit comprises a four-way reversing valve 12 and a solution pump 13, wherein two passages of the four-way reversing valve 12 are connected with the solution pump 13, the other two passages are respectively connected with the lithium battery unit and the heat conversion unit, the solution pump 13 provides power for working media flowing through the four-way reversing valve 12, and the transmission effect is enhanced, so that the power unit plays roles of providing working media circulating power and prolonging the heat transfer distance, the power heat pipe driven by the solution pump can overcome the along-way resistance generated by long-distance conveying of the working media of the heat pipe at the cost of consuming a small amount of electric energy, the problem of insufficient driving force under a small temperature difference is avoided, and the problem of limitation of installation of a condensing section which is only at the high position of an evaporation section and is similar to that of a gravity type single heat pipe is avoided.
The central controller 15 is respectively connected with a lithium battery box body temperature sensor 10, an external heat exchanger heat pipe electromagnetic valve I41, an external heat exchanger heat pipe electromagnetic valve II 42, a phase change heat accumulator heat pipe electromagnetic valve I31, a phase change heat accumulator heat pipe electromagnetic valve II 32, an external heat exchanger fan 6, a phase change heat accumulator temperature sensor 8, a self-circulation heat pipe electromagnetic valve 11, a four-way reversing valve 12, a solution pump 13 and an external temperature sensor 24 arranged in the air through a control and power output line 14; the central controller 15 is used for controlling the electromagnetic valves, the solution pump and other parts by collecting and processing the signals of the sensors, and performing optimal energy-saving heat management in the lithium battery box body in different occasions.
In this embodiment, according to the optimized program instruction, the central controller 15 collects and processes the temperatures detected by the lithium battery case body temperature sensor 10 and the external temperature sensor 24, and when the temperature difference between the inside and the outside of the case is large, the external heat exchanger fan 6 can be turned off by controlling and power output line 14, even the solution pump 13 is turned off and the self-circulation heat pipe electromagnetic valve 11 is turned on to start the heat pipe self-circulation mode, so as to improve the energy saving effect; when the phase-change heat accumulator temperature sensor 8 detects that the temperature of the phase-change heat accumulator 5 reaches the upper limit of the set value, the phase-change heat accumulator heat pipe electromagnetic valve 3 is closed, and all heat is dissipated to the external environment from the external heat exchanger 7. The specific operation process is as follows:
in the discharging operation of the lithium battery, the heat pipe working medium absorbs heat and evaporates in the inner micro-channel heat pipe heat exchanger 16 of the lithium battery unit 1 in a two-phase flow mode, and enters the heat conversion unit to release heat and condense through the working medium circulation pipeline 2, namely, the inner heat exchange channel and the outer heat exchange channel release heat and condense, then enters the solution pump 13 of the power unit to increase pressure, the four-way reversing valve 12 (the solid line in fig. 1 is the working medium flowing direction) determines the flowing direction, and returns to the inner micro-channel heat pipe heat exchanger 16 of the lithium battery unit 1 to absorb heat and evaporate again, and the circulation is performed, so that the internal heat of the lithium battery unit 1 is conveyed to the phase change heat accumulator 5, and the redundant heat is discharged to the external environment in time. It should be noted that the heat stored in the phase change heat accumulator 5 may be transferred to other locations for other uses, such as heating.
Example 2
Unlike embodiment 1, this embodiment is a lithium battery warm-up mode, which includes the lithium battery unit 1, the heat pipe working medium circulation line 2, the internal heat exchange channels in the heat conversion unit, the power unit, the control and power output line 14, and the central controller 15, as shown in fig. 3, i.e., the mode does not include the external heat exchange channels in the heat conversion unit, and the self-circulation heat pipe electromagnetic valve 11 is closed. The power unit is switched to a preheating mode, and the flowing direction of working medium between the lithium battery unit 1 and the heat conversion unit is changed.
In this embodiment, according to the optimized program instruction, when the internal temperature of the lithium battery unit 1 detected by the lithium battery box body temperature sensor 10 reaches the preheating set value, the central controller 15 turns off the heat pipe system through the control and power output line 14 and allows the lithium battery pack to be started; when the internal temperature of the lithium battery unit 1 detected by the lithium battery box body temperature sensor 10 reaches the set upper limit, a heat pipe heat dissipation mode is started. The specific operation process is as follows:
before the lithium battery pack is started at low temperature or charged at low temperature, the central controller 15 starts a heat pipe system preheating mode, heat pipe working media in a two-phase flow form are subjected to exothermic condensation in the internal micro-channel heat pipe heat exchanger 16 of the lithium battery unit 1, pressure is increased by a working medium circulating pipeline 2 through a solution pump 13 entering the power unit, a four-way reversing valve 12 (the dotted line in fig. 3 is the working medium flowing direction) determines the flowing direction, then the heat is absorbed and evaporated through an internal heat exchange channel in the heat conversion unit, the heat is returned to the internal micro-channel heat pipe heat exchanger 16 of the lithium battery unit 1 and subjected to exothermic condensation again, and the heat is circulated in this way, so that the heat of the phase change heat accumulator 5 is transmitted to the lithium battery unit 1, and the aim of preheating a lithium battery is achieved.
According to the schemes described in embodiments 1 and 2, the central controller performs optimal energy-saving thermal management in the lithium battery unit by outputting different switching value instructions to different components in the system under different occasions according to the parameters of the internal preset program, the phase change heat accumulator temperature sensor, the lithium battery box body temperature sensor and the external temperature sensor, and the specific operation method is as follows:
1. when the lithium battery pack works normally, the electromagnetic valve of the heat pipe of the phase change heat accumulator is closed, the heat pipe system drives working medium to perform two-phase flow movement through the solution pump and the temperature difference between the inside and outside of the battery box, heat is discharged to the external environment through the external heat exchanger and the fan, and the temperature in the box is maintained in a proper range;
2. when the lithium battery pack works normally, the electromagnetic valve of the heat pipe of the phase change heat accumulator is closed, if the external environment temperature is lower, the operation of the fan is stopped, and the temperature in the box is maintained in a proper interval in a more energy-saving mode;
3. when the lithium battery pack works normally, the electromagnetic valve of the heat pipe of the phase change heat accumulator is closed, if the external environment temperature is low and the temperature difference between the inside and the outside of the battery box is large, the operation of the solution pump and the fan is stopped, the electromagnetic valve of the self-circulation heat pipe is opened, the self-circulation mode of the heat pipe is entered, and the maximum energy saving is realized, so that the temperature in the box is maintained in a proper interval;
4. when the lithium battery pack works normally, if the temperature of the phase change heat accumulator is lower than the lower limit of a set value, the phase change heat accumulator is preferentially supplied with heat by opening a heat pipe electromagnetic valve of the phase change heat accumulator and closing a heat pipe electromagnetic valve of an external heat exchanger, so that waste heat storage and recycling are realized; if the temperature of the phase change heat accumulator reaches the upper limit of the set value, exchanging states of the two groups of electromagnetic valves, and exhausting heat to the external environment;
5. when the temperature of the lithium battery pack is lower, before a motor is started or the lithium battery pack is charged, the four-way reversing valve is switched into a preheating mode, the heat pipe electromagnetic valve of the phase change heat accumulator is opened, the heat pipe electromagnetic valve of the external heat exchanger and the self-circulation heat pipe electromagnetic valve are closed, the heat pipe system drives working media to perform two-phase flow movement through a solution pump and the temperature difference between the inside of the battery box and the phase change heat accumulator, heat stored by the phase change heat accumulator is discharged into the battery box, the battery pack is rapidly heated to a proper temperature range, and micro energy consumption preheating is realized by waste heat.
Compared with the convection heat exchange thermal resistance of gas and solid wall, the convection heat exchange thermal resistance of gas-liquid two-phase flow and solid wall is smaller, the heat transfer efficiency is high, and the defect that dust is easy to accumulate in gas transmission is avoided; the two-phase flow heat pipe has high energy transmission density, and the required driving force, heat exchange area, heat exchanger volume and connecting pipeline diameter are greatly reduced; in addition, the heat exchanger formed by combining a plurality of traditional single heat pipes is very difficult to overhaul and change the single heat pipes, and the two-phase flow power type separated heat pipe system has mature parts like a condenser, an evaporator, a connecting pipeline and the like of a direct expansion refrigeration system, and is convenient to maintain.
The application has been described above with reference to preferred embodiments, but the scope of the application is not limited thereto, various modifications may be made thereto and equivalents may be substituted for elements thereof without structural conflict, technical features mentioned in the various embodiments may be combined in any way, and any reference signs in the claims shall not be construed as limiting the claims concerned, the embodiments shall be construed as exemplary and non-limiting in all respects. Therefore, any and all technical solutions falling within the scope of the claims are within the scope of the present application.
Claims (2)
1. The lithium battery preheating and radiating system utilizing the two-phase flow power type split heat pipe comprises a lithium battery unit (1), a heat pipe working medium circulating pipeline (2), a central controller (15) and a self-circulation heat pipe electromagnetic valve (11), and is characterized by further comprising a heat conversion unit and a power unit, wherein the lithium battery unit (1), the heat conversion unit and the self-circulation heat pipe electromagnetic valve (11)/the power unit form a loop through the heat pipe working medium circulating pipeline (2);
the lithium battery unit (1) comprises a lithium battery box body temperature sensor (10), an internal micro-channel heat pipe heat exchanger (16) and a lithium battery module (18), wherein heat conduction silicone grease (23) is filled between the internal micro-channel heat pipe heat exchanger (16) and the lithium battery module (18); the heat conversion unit comprises an inner heat exchange channel and an outer heat exchange channel, the inner heat exchange channel comprises a phase-change heat accumulator heat pipe electromagnetic valve I (31), a phase-change heat accumulator (5) and a phase-change heat accumulator heat pipe electromagnetic valve II (32) which are sequentially connected, a phase-change heat accumulator temperature sensor (8) and a phase-change heat accumulator inner heat exchanger (9) are arranged in the phase-change heat accumulator (5), and the outer heat exchange channel comprises an outer heat exchanger heat pipe electromagnetic valve I (41), an outer heat exchanger (7) and an outer heat exchanger heat pipe electromagnetic valve II (42) which are sequentially connected;
the power unit comprises a four-way reversing valve (12) and a solution pump (13), two passages of the four-way reversing valve (12) are connected with the solution pump (13), and the other two passages are respectively connected with the lithium battery unit (1) and the heat conversion unit;
the central controller (15) is respectively connected with a lithium battery box body temperature sensor (10), an external heat exchanger heat pipe electromagnetic valve I (41), an external heat exchanger heat pipe electromagnetic valve II (42), a phase change heat accumulator heat pipe electromagnetic valve I (31), a phase change heat accumulator heat pipe electromagnetic valve II (32), a phase change heat accumulator temperature sensor (8), a self-circulation heat pipe electromagnetic valve (11), a four-way reversing valve (12), a solution pump (13) and an external temperature sensor (24) arranged in the air through control and power output lines (14);
the external heat exchange channel further comprises an external heat exchanger fan (6), the external heat exchanger fan (6) is arranged on the outer side of the external heat exchanger (7), and the external heat exchanger fan (6) is connected with the central controller (15) through a control and power output line (14);
an exhaust dust-proof valve (17) is arranged at the top of the lithium battery unit (1).
2. The lithium battery preheating and heat dissipation system utilizing the two-phase flow power type split heat pipe according to claim 1, wherein the manufacturing materials of the inner microchannel heat pipe heat exchanger (16), the phase change heat accumulator inner heat exchanger (9) and the outer heat exchanger (7) are aluminum alloys.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710809905.7A CN107681223B (en) | 2017-09-08 | 2017-09-08 | Lithium battery preheating and heat dissipation system utilizing two-phase flow power type separated heat pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710809905.7A CN107681223B (en) | 2017-09-08 | 2017-09-08 | Lithium battery preheating and heat dissipation system utilizing two-phase flow power type separated heat pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107681223A CN107681223A (en) | 2018-02-09 |
| CN107681223B true CN107681223B (en) | 2023-12-01 |
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| CN109378548B (en) * | 2018-11-01 | 2020-10-30 | 平湖市伊凡家箱包有限公司 | Method for heat storage system of power battery pack |
| DE102018219462A1 (en) * | 2018-11-14 | 2020-05-14 | Audi Ag | Bracket device and method for supporting at least one of two boundary surfaces, between which a medium is arranged |
| CN110190296B (en) * | 2019-05-16 | 2020-06-05 | 苏州纳尔森能源科技有限公司 | Battery thermal management system and control method thereof |
| CN111883874B (en) * | 2020-06-01 | 2021-09-07 | 浙江吉利汽车研究院有限公司 | Variable thermal resistance thermal management system of battery and control method |
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