CN112721736A - Integrated power battery thermal management system with cooling and fire extinguishing functions - Google Patents

Integrated power battery thermal management system with cooling and fire extinguishing functions Download PDF

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Publication number
CN112721736A
CN112721736A CN202110046294.1A CN202110046294A CN112721736A CN 112721736 A CN112721736 A CN 112721736A CN 202110046294 A CN202110046294 A CN 202110046294A CN 112721736 A CN112721736 A CN 112721736A
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CN
China
Prior art keywords
liquid
valve
battery
cooling
electromagnetic valve
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Pending
Application number
CN202110046294.1A
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Chinese (zh)
Inventor
范立云
李奎杰
陈雅
毛运涛
钟鑫
王鑫浩
高新宇
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Harbin Engineering University
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Harbin Engineering University
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Priority to CN202110046294.1A priority Critical patent/CN112721736A/en
Publication of CN112721736A publication Critical patent/CN112721736A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
    • A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/005—Delivery of fire-extinguishing material using nozzles
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
    • A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • H—ELECTRICITY
    • H01—BASIC 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—BASIC 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—BASIC 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
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—BASIC 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
    • H01M10/635—Control systems based on ambient temperature
    • H—ELECTRICITY
    • H01—BASIC 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
    • H01M10/6567—Liquids
    • 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
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention aims to provide an integrated power battery thermal management system with cooling and fire extinguishing functions, wherein a compressor, a condenser, a drying filter, a refrigeration electromagnetic valve, a capillary tube and an evaporator are sequentially connected to form a compressor unit refrigeration unit; a manual valve and a liquid spraying electromagnetic valve are led out of the front of the refrigeration electromagnetic valve to form a spraying branch; a manual valve and a thermal electromagnetic valve are led out from a pipeline between the compressor and the condenser to form a thermal bypass branch; the first three-way connecting valve, the water absorption filter and the regulating valve are connected to a liquid outlet of a liquid cooling plate in the battery liquid tank to form a liquid cooling branch, the second three-way connecting valve, the water absorption filter and the liquid return electromagnetic valve form a liquid fire extinguishing branch from a liquid return port of the sealed battery liquid tank, and the circulating pump, the temperature sensor, the flow regulating valve, the diaphragm valve and the heater are sequentially connected to form a liquid cooling circulating unit. The invention integrates the cooling and fire extinguishing functions into a whole, can improve the space utilization rate of the system and enhance the safety performance of the whole heat management system.

Description

Integrated power battery thermal management system with cooling and fire extinguishing functions
Technical Field
The invention relates to a power battery management system.
Background
The power battery, the motor and the electric control technology are used as core 'three-electricity' components of the new energy automobile, and the performance of the power battery, the motor and the electric control technology has a self-evident important influence degree on the whole automobile. Particularly, the current power battery is developing towards high energy density and short charging time, and the high heat output of the power battery needs to be quickly dissipated by a thermal management system so as to ensure that the whole battery module or the battery pack is in a proper working temperature range and the temperature uniformity of the battery at different positions in the system.
The existing battery thermal management methods mainly comprise: air cooling, liquid cooling, phase change material cooling and heat pipe cooling. The air-cooled power battery heat management mode is characterized in that the specific heat capacity of air is small, the heat conduction coefficient is low, the heat convection coefficient is small, the heat dissipation time is long, the cooling effect with high charging and discharging multiplying power is poor, the pressure difference between the inlet and the outlet of the whole system is large, the flow field is uneven, and the difference of the cooling conditions among batteries in the battery pack can cause the battery pack to generate large temperature difference and be gradually eliminated by a host factory. The phase-change material has low thermal conductivity, low phase-change latent heat, limited heat exchange amount, additional increase of system volume, heavier mass, greatly reduced mass energy density and volume energy density of the whole heat management system, failure in timely heat dissipation and difficulty in preheating in a phase-change material heat management mode. The heat pipe and the battery have high shape adaptability requirement, complex structure, poor heat exchange performance of the pipe structure, high insulativity requirement, high processing technology requirement and high cost. The phase-change material cooling power battery technology and the heat pipe technology need a certain time from industrial application.
The refrigerant of the liquid cooling power battery heat management mode has the advantages of large specific heat capacity, high heat conductivity, large heat transfer coefficient, thin boundary layer, strong heat exchange capacity, integrated heat dissipation and preheating functions, good temperature uniformity and the like, and is widely applied. The liquid cooling power battery heat management mode mainly comprises secondary loop liquid cooling and direct contact liquid cooling, the heat exchange thermal resistance of the secondary loop liquid cooling mode is large, heat loss is large in the heat exchange process, the heat exchange effect is poor, the contact thermal resistance between the power battery and a refrigerant can be greatly reduced by adopting the direct contact liquid cooling mode, the heat conductivity coefficient of the insulating cooling liquid is high, the heat exchange performance is good, and the system energy-saving effect is obvious.
Disclosure of Invention
The invention aims to provide an integrated power battery thermal management system with cooling and fire extinguishing functions, which enhances the safety performance of the whole thermal management system.
The purpose of the invention is realized as follows:
the invention discloses an integrated power battery thermal management system with cooling and fire extinguishing functions, which is characterized in that: the system comprises a sealed battery liquid tank, a condenser, a compressor, an evaporator, a gas-liquid separator, a plate heat exchanger and a circulating pump, wherein the compressor, the condenser, a drying filter, a refrigeration electromagnetic valve, a capillary tube and the evaporator are sequentially connected to form a refrigeration unit of a compressor unit; a manual valve and a liquid spraying electromagnetic valve are led out of the front of the refrigeration electromagnetic valve to form a spraying branch; a manual valve and a thermal electromagnetic valve are led out from a pipeline between the compressor and the condenser to form a thermal bypass branch; the first three-way connecting valve is connected with the evaporator, the second three-way connecting valve is connected with the water absorption filter, the regulating valve is connected with a liquid outlet of a liquid cooling plate in the battery liquid tank to form a liquid cooling branch, the second three-way connecting valve is connected with the first three-way connecting valve and the plate heat exchanger, the water absorption filter and the liquid return electromagnetic valve are connected to a liquid return port of the sealed battery liquid tank to form a liquid fire extinguishing branch, the third three-way connecting valve is connected with the evaporator, the plate heat exchanger and the circulating pump, the temperature sensor, the flow regulating valve, the diaphragm valve and the heater are sequentially connected to form a liquid cooling circulation unit, the solid-state frequency converter is connected with the circulating pump, the solid-state relay is connected with the heater, the heater is connected with the signal controller and is connected with the.
The present invention may further comprise:
1. sealed battery liquid case includes interconnect's box and case lid, set up the battery module in the box, battery module below sets gradually heat conduction pad and liquid cooling board, the liquid cooling board sets up inlet and liquid outlet, be the cooling runner of circulation perfluor hexanone between inlet and the liquid outlet, connect the gallows on the case lid, gallows connects dish type support, arrange atomizing nozzle on the dish type support, set up box pressure sensor on the box, box temperature sensor, gas sensor, alarm and relief valve, box pressure sensor connects alarm and relief valve, box temperature sensor and gas sensor link to each other with signal controller.
2. The battery module generates heat, the heat generating power of the battery exceeds a threshold value, and a compressor, a condenser, a refrigeration electromagnetic valve, a capillary tube, an evaporator and a drying filter are started to work in a matched mode to realize refrigeration circulation; when the heat generating power of the battery is lower than a threshold value, the plate heat exchanger and the radiating fins of the plate heat exchanger are started to work in a matching manner to exchange heat; a box body temperature sensor and a gas sensor in a sealed battery liquid box monitor the operation thermal state of a battery, when the temperature of the battery is overhigh or harmful gas is generated, a signal controller controls a three-way reversing electromagnetic valve to open a liquid fire extinguishing branch, and a circulating pump conveys perfluorohexanone to an atomizing nozzle on a disc-shaped bracket; when the battery works normally and heat dissipation is needed, the signal controller controls the three-way reversing solenoid valve to circulate the liquid cooling branch, and the circulating pump conveys the perfluorohexanone to the liquid inlet of the liquid cooling plate; when the battery is started after being heated in an extremely cold environment, the solid relay on the circulating liquid cooling connection unit controls the heater to work to heat the battery; when a pressure sensor of a box body in the sealed battery liquid box monitors that the pressure exceeds a set threshold value, an alarm gives an alarm, and a safety valve is opened to carry out system pressure relief.
The invention has the advantages that:
1. the power battery operation heat state is monitored through the temperature/gas multifunctional sensor, signals such as temperature, gas and the like are transmitted to the signal controller through the signal controller, and then the signal controller controls the three-way reversing solenoid valve to select the liquid cooling branch or the fire extinguishing branch, so that the system integration level is high, the space utilization rate is high, and the practical value is high.
2. The invention selects the perfluorohexanone as the fire extinguishing agent, can reduce heat exchange resistance when the whole heat management system is in abnormal conditions, and has good fire extinguishing effect and high safety performance.
3. According to the invention, by arranging the plurality of refrigeration branches connected in parallel, the whole system can select a proper refrigeration branch according to the heat generation power of the battery, the energy loss in the operation process of the whole heat management system is reduced, and the energy-saving effect is achieved.
4. The heater and the solid-state relay are arranged on the circulating liquid cooling connecting unit, so that the aim of preheating the power battery under an extremely cold working condition can be fulfilled.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of a partial structure of a liquid cooling unit of a battery module.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1-2, the invention provides an integrated power battery thermal management system with cooling and fire extinguishing functions, a temperature/pressure/gas multifunctional sensor is arranged in a sealed battery liquid tank, state data monitored by the sensor is transmitted to a signal controller, the signal controller controls the whole thermal management system to operate a liquid cooling unit or a liquid fire extinguishing unit, and an atomizing nozzle on the liquid fire extinguishing unit is arranged in a disc shape, so that the spraying coverage rate can be improved. The invention integrates the functions of heat dissipation, preheating and fire extinguishing, and has the advantages of good heat exchange effect, wide application range and high practical value.
As shown in FIG. 1, the integrated power battery thermal management system with cooling and fire extinguishing functions comprises: the device comprises a signal controller 1, a three-way reversing electromagnetic valve 2, a pressure sensor 3, a temperature sensor 4, a wiring port 5, a disk-shaped bracket 6, a gas sensor 7, an alarm 8, a safety valve 9, a hanger 10, an atomizing nozzle 11, a battery 12, a sealed battery liquid tank 13, a heat conducting pad 14, a liquid cooling plate 15, a perfluorohexanone 16, a liquid discharge valve 17, a regulating valve 18, a water absorption filter 19, a three-way connecting valve 20, a gas-liquid separator 21, a low-pressure protector 22, a low-pressure meter 23, a compressor 24, a high-pressure meter 25, a high-pressure protector 26, a condenser 27, a manual valve 28, a Y-shaped filter 29, a flow switch 30, a drying filter 31, a refrigeration electromagnetic valve 32, a capillary tube 33, a liquid spraying electromagnetic valve 34, a thermal electromagnetic valve 35, an evaporator 36, a plate heat exchanger 37, a plate heat-type heat-exchanger radiating, A temperature sensor 43, a flow sensor 44, a flow regulating valve 45, a diaphragm valve 46, a heater 47 and a solid state relay 48.
When the battery module is used, a plurality of batteries 12 are connected into the battery module through the conducting bars, the heat conducting pad 14 and the liquid cooling plate 15 are sequentially arranged below the battery module, and the whole battery module is placed in the sealed battery liquid tank 13. The sealed battery liquid box 13 is formed by connecting a box body and a box cover in a matched mode through a fixing bolt and a sealing washer, a hanging frame 10 is connected to the box cover, the hanging frame 10 is connected with the disc-shaped support 6, and a plurality of atomizing nozzles 11 are equidistantly arranged on the disc-shaped support 6; the liquid cooling plate 15 is internally provided with a cooling flow channel for circulating perfluorohexanone 16, and the liquid cooling plate 15 is provided with a liquid inlet and a liquid outlet. The box body is connected with a pressure sensor 3, a temperature sensor 4, a gas sensor 7, an alarm 8 and a safety valve 9, and the pressure sensor 3 is connected with the alarm 8 and the safety valve 9. The temperature sensor 4 and the gas sensor 7 are connected with the signal controller 1, the signal controller 1 is connected with and controls the three-way reversing electromagnetic valve 2, the three-way reversing electromagnetic valve 2 is connected with a liquid inlet of the liquid cooling plate 15 and an inlet of the sealed battery liquid tank 13 to respectively form a liquid cooling branch and a fire extinguishing branch, and the sealed battery liquid tank 13 is provided with a wiring port 5 and a liquid discharge valve 17.
The compressor 24, the condenser 27, the refrigeration solenoid valve 32, the capillary tube 33, the evaporator 36, and the dry filter 31 form a compressor unit refrigeration unit; a manual valve and a liquid spraying electromagnetic valve 34 are led out from the front of the refrigeration electromagnetic valve 32 to form a spraying branch; a manual valve and a thermal solenoid valve 35 are led out from the line between the compressor 24 and the condenser 27 to form a hot bypass branch. The evaporator 36 and the plate heat exchanger 37 are connected through a three-way connecting valve 20, and then the regulating valve 18 and the water absorption filter 19 are connected to the liquid outlet of the liquid cooling plate 15 to form a liquid cooling branch. And the other three-way connecting valve is connected with a water absorption filter 39 and a liquid return electromagnetic valve 40 to a liquid return port of the sealed battery liquid tank 13 to form a liquid fire extinguishing branch. The circulating pump 42, the temperature sensor 43, the flow sensor 44, the flow regulating valve 45, the diaphragm valve 46 and the heater 47 are connected in series to the three-way reversing solenoid valve 2 to form a liquid cooling circulating unit, the solid-state frequency converter 41 is connected with the circulating pump 42, and the solid-state relay 48 is connected with the heater 47.
In this embodiment, when the system works, the battery modules connected to the plurality of batteries 12 through the conductive bars generate heat, and the heat generating power of the batteries 12 exceeds a threshold value to start the compressor 24, the condenser 27, the refrigeration solenoid valve 32, the capillary tube 33, the evaporator 36 and the drying filter 31 to cooperate with each other to realize refrigeration cycle; when the heat generating power of the battery 12 is lower than the threshold value, the plate heat exchanger 37 and the plate heat exchanger radiating fins 38 are started to work in a matching mode to exchange heat. The temperature sensor 4 and the gas sensor 7 in the sealed battery liquid tank 13 monitor the battery operation thermal state, when the battery temperature is too high or the thermal runaway phenomenon such as harmful gas is generated, the sensor transmits a data signal to the signal controller 1, the signal controller 1 controls the three-way reversing electromagnetic valve 2 to open a liquid fire extinguishing branch, and the circulating pump 42 conveys the perfluorohexanone 16 to a plurality of atomizing nozzles 11 which are equidistantly arranged on the disc-shaped support 6. When the battery works normally and heat dissipation is needed, the signal controller 1 controls the three-way reversing electromagnetic valve 2 to circulate the liquid cooling branch, and the circulating pump 42 conveys the perfluorohexanone 16 to the liquid inlet of the liquid cooling plate 15. When the battery is started again after being heated in an extremely cold environment, the solid state relay 48 on the circulating liquid cooling connection unit controls the heater 47 to work to heat the battery 12. When the pressure sensor 3 in the sealed battery liquid tank 13 monitors that the system pressure exceeds a set threshold value, the alarm 8 gives an alarm, and the safety valve 9 is opened to carry out system pressure relief.
The purpose of the invention is realized by the following technical scheme: the system comprises a battery module liquid cooling unit, a compressor unit main refrigerating unit, a plate type heat exchanger auxiliary cooling unit and a circulating liquid cooling connection unit; the battery module liquid cooling unit is provided with a liquid cooling branch and a liquid fire extinguishing branch. The battery module liquid cooling unit comprises a battery module formed by connecting a plurality of conductive bars with a plurality of battery cells, a sealed battery liquid tank, a heat conducting pad, a liquid cooling plate, perfluorohexanone, a three-way reversing electromagnetic valve, an atomizing nozzle, a disc-shaped bracket, a distribution pipe, a temperature sensor, a gas sensor, a pressure sensor, a safety valve, an alarm and a liquid discharge valve; arranging a liquid cooling plate fixed at the bottom of the sealed battery liquid box; a gas sensor and a temperature sensor liquid level meter are arranged in the sealed battery liquid tank; the gas sensor and the temperature sensor are in signal correlation with the three-way reversing solenoid valve; the top of the sealed battery liquid tank is provided with a safety valve, an alarm and a pressure sensor, and the safety valve and the alarm are connected with the pressure sensor. The sealed battery liquid box consists of a box body and a box cover which are connected by bolts and matched with a sealing washer; the right side of the sealed battery liquid tank is provided with a wiring port, the bottom of the sealed battery liquid tank is provided with a liquid outlet, the upper right side of the sealed battery liquid tank is provided with a liquid inlet, the lower left side of the sealed battery liquid tank is provided with a liquid return port, and the arranged liquid inlet and the liquid return port are both connected with a pipeline of the circulating liquid cooling connection unit; the opening of the sealed battery liquid box is provided with sealant, and the whole battery liquid box adopts double-layer rubber and plastic heat preservation and insulation. The inboard at case lid top sets up disk type support and distributing pipe, sets up atomizing nozzle on the distributing pipe, and atomizing nozzle sets up directly over the power battery module, overlooks every atomizing nozzle, and it is just to the clearance between electric core and the electric core side.
The external circulation liquid cooling unit comprises a three-way reversing electromagnetic valve, a signal controller, a circulating pump, a solid-state frequency converter, a liquid return electromagnetic valve, a heater, a solid-state relay, a temperature sensor, a flow regulating valve and a water absorption filter; the three-way reversing electromagnetic valve is connected with the signal controller in series, and the signal controller receives data signals transmitted by the temperature sensor and the gas sensor; a three-way connecting valve on the refrigeration unit connects a circulating pump, a heater, a temperature sensor, a flow sensor and a flow regulating valve in series and is connected to a three-way reversing electromagnetic valve, the circulating pump is connected with a solid-state frequency converter, and the heater is connected with a solid-state relay; after passing through the three-way reversing solenoid valve, the refrigerant liquid cooling main line is divided into a liquid cooling branch and a liquid fire extinguishing branch, perfluorohexanone on the liquid cooling branch flows into the liquid cooling plate and exchanges heat with the power battery, and perfluorohexanone on the liquid fire extinguishing branch flows to the atomizing nozzles connected with the distribution pipes on the box cover to cool and extinguish the power battery; one end of the other three-way connecting valve on the refrigerating unit connects the liquid return electromagnetic valve and the water absorption filter to a liquid return port of the sealed battery liquid tank to form a liquid fire extinguishing branch, and the other end of the three-way connecting valve connects the regulating valve and the water absorption filter to a liquid outlet of a liquid cooling plate at the bottom of the sealed battery liquid tank to form a liquid cooling branch; the pipeline connection adopts quick connector and clamp cooperation, increases to set up the check valve and prevents the coolant liquid backward flow.
The main refrigeration unit of the compressor unit adopts a mode of combining a refrigeration cycle, a thermal bypass and a spray liquid cooling loop, the refrigeration cycle is formed by connecting a compressor, a condenser, a drying filter, a manual valve, a refrigeration electromagnetic valve, an expansion valve and an evaporator in series, and the condenser is provided with a Y-shaped filter and a flow switch; a low-pressure meter and a low-pressure protector are arranged on a pipeline between the compressor and the evaporator, and a high-pressure meter and a high-pressure protector are arranged on a pipeline between the compressor and the condenser; a manual valve and a refrigeration circulating pipe of which a thermal electromagnetic valve is connected to an evaporator are led out from one side of a high-pressure meter of the compressor to form a thermal bypass loop; and a manual valve and a liquid spraying electromagnetic valve are led out from the position of a refrigeration electromagnetic valve on the refrigeration cycle to form a liquid spraying cooling loop, and the liquid spraying cooling loop is connected with the refrigeration cycle in parallel. The plate heat exchanger auxiliary cooling unit comprises two three-way connecting valves, a plate heat exchanger and plate heat exchanger radiating fins, the three-way connecting valves are connected with the evaporator, the plate heat exchanger, a liquid outlet of a liquid cooling plate on a liquid cooling branch and a liquid return port arranged on a sealed battery liquid box on a liquid fire extinguishing branch, and the compressor unit main refrigeration unit is connected with the plate heat exchanger auxiliary cooling unit in parallel.
The invention judges whether the system generates thermal runaway phenomenon by monitoring temperature and gas production through the sensor, and selects the circulating liquid cooling branch or the fire extinguishing branch by skillfully designing the signal controller and the three-way reversing solenoid valve. The invention integrates the functions of cooling, heating and fire extinguishing, the space utilization rate and the safety performance of the whole system are further improved, and the practical value is high.

Claims (3)

1. The utility model provides an integral type power battery thermal management system with cooling and function of putting out a fire, characterized by: the system comprises a sealed battery liquid tank, a condenser, a compressor, an evaporator, a gas-liquid separator, a plate heat exchanger and a circulating pump, wherein the compressor, the condenser, a drying filter, a refrigeration electromagnetic valve, a capillary tube and the evaporator are sequentially connected to form a refrigeration unit of a compressor unit; a manual valve and a liquid spraying electromagnetic valve are led out of the front of the refrigeration electromagnetic valve to form a spraying branch; a manual valve and a thermal electromagnetic valve are led out from a pipeline between the compressor and the condenser to form a thermal bypass branch; the first three-way connecting valve is connected with the evaporator, the second three-way connecting valve is connected with the water absorption filter, the regulating valve is connected with a liquid outlet of a liquid cooling plate in the battery liquid tank to form a liquid cooling branch, the second three-way connecting valve is connected with the first three-way connecting valve and the plate heat exchanger, the water absorption filter and the liquid return electromagnetic valve are connected to a liquid return port of the sealed battery liquid tank to form a liquid fire extinguishing branch, the third three-way connecting valve is connected with the evaporator, the plate heat exchanger and the circulating pump, the temperature sensor, the flow regulating valve, the diaphragm valve and the heater are sequentially connected to form a liquid cooling circulation unit, the solid-state frequency converter is connected with the circulating pump, the solid-state relay is connected with the heater, the heater is connected with the signal controller and is connected with the.
2. The integrated power battery thermal management system with the cooling and fire extinguishing functions as claimed in claim 1, wherein the integrated power battery thermal management system comprises: sealed battery liquid case includes interconnect's box and case lid, set up the battery module in the box, battery module below sets gradually heat conduction pad and liquid cooling board, the liquid cooling board sets up inlet and liquid outlet, be the cooling runner of circulation perfluor hexanone between inlet and the liquid outlet, connect the gallows on the case lid, gallows connects dish type support, arrange atomizing nozzle on the dish type support, set up box pressure sensor on the box, box temperature sensor, gas sensor, alarm and relief valve, box pressure sensor connects alarm and relief valve, box temperature sensor and gas sensor link to each other with signal controller.
3. The integrated power battery thermal management system with the cooling and fire extinguishing functions as claimed in claim 2, wherein the integrated power battery thermal management system comprises: the battery module generates heat, the heat generating power of the battery exceeds a threshold value, and a compressor, a condenser, a refrigeration electromagnetic valve, a capillary tube, an evaporator and a drying filter are started to work in a matched mode to realize refrigeration circulation; when the heat generating power of the battery is lower than a threshold value, the plate heat exchanger and the radiating fins of the plate heat exchanger are started to work in a matching manner to exchange heat; a box body temperature sensor and a gas sensor in a sealed battery liquid box monitor the operation thermal state of a battery, when the temperature of the battery is overhigh or harmful gas is generated, a signal controller controls a three-way reversing electromagnetic valve to open a liquid fire extinguishing branch, and a circulating pump conveys perfluorohexanone to an atomizing nozzle on a disc-shaped bracket; when the battery works normally and heat dissipation is needed, the signal controller controls the three-way reversing solenoid valve to circulate the liquid cooling branch, and the circulating pump conveys the perfluorohexanone to the liquid inlet of the liquid cooling plate; when the battery is started after being heated in an extremely cold environment, the solid relay on the circulating liquid cooling connection unit controls the heater to work to heat the battery; when a pressure sensor of a box body in the sealed battery liquid box monitors that the pressure exceeds a set threshold value, an alarm gives an alarm, and a safety valve is opened to carry out system pressure relief.
CN202110046294.1A 2021-01-14 2021-01-14 Integrated power battery thermal management system with cooling and fire extinguishing functions Pending CN112721736A (en)

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