CN111342167A - Power battery thermal management system based on pole lug air cooling mode - Google Patents
Power battery thermal management system based on pole lug air cooling mode Download PDFInfo
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- CN111342167A CN111342167A CN202010232862.2A CN202010232862A CN111342167A CN 111342167 A CN111342167 A CN 111342167A CN 202010232862 A CN202010232862 A CN 202010232862A CN 111342167 A CN111342167 A CN 111342167A
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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
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- 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
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- 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
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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
- H01M10/615—Heating or keeping warm
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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
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
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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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/65—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
- H01M10/6565—Gases with forced flow, e.g. by blowers with recirculation or U-turn in the flow path, i.e. back and forth
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- 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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- 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 a power battery thermal management system based on a tab air cooling mode, which comprises a battery module, a tab air cooling pipeline, an external circulating fan, a compressor, a condenser, an expansion valve, an evaporator, a plate heat exchanger, an internal circulating fan and a heater, wherein the battery module, the tab air cooling pipeline, the external circulating fan, the compressor, the condenser, the expansion valve, the evaporator, the plate heat exchanger, the internal circulating fan and the heater form a battery tab heat dissipation unit, a compressor unit main cold air unit, a plate heat exchanger secondary cold air unit, an air cooling internal circulating unit and an air cooling external circulating unit, and. The invention relates to a power battery heat management system based on a tab air cooling mode, which is used for ventilating, dispersing and preheating a battery tab, reducing heat exchange resistance, improving heat management efficiency, removing harmful gas in the system and reducing system energy consumption by a multi-branch design.
Description
Technical Field
The invention relates to a power battery thermal management system.
Background
In recent years, consumption of Chinese automobiles drives consumption of petroleum, and the consumption demand of the Chinese petroleum is continuously increased, but the quantity of the petroleum produced by China is limited, and the quantity of the petroleum produced by China shows a downward trend year by year. In 2017, the carbon dioxide emission in China is the first global level, the total emission is twice of the emission in the United states, and China promises the Paris climate meeting: the total carbon dioxide emission amount in domestic production in 2030 will be reduced by 60-65% compared with 2005, the carbon dioxide emission reaches the peak in 2030, and the peak is reached as soon as possible. In the coming decade, the economic development and production of China need to be based on renewable energy sources, and the environment is protected and the discharge pressure is high. In 2018, the dependence of China on petroleum is over 70 percent and seriously exceeds 50 percent of safety warning lines, the dependence of China on foreign petroleum is too high, and the problem of energy safety is gradually highlighted.
In recent decades, China has revolutionized lithium ion batteries, with costs 90% lower than before, energy density 3 times higher, and power density 5 times higher. However, the lithium ion power battery generates heat during charging and discharging due to its electrochemical performance, and mainly includes: irreversible heat, reversible heat, electron transport heat, ion transport heat, and contact resistance generate heat. The lithium battery works in high-temperature and low-temperature environments for a long time, and both the capacity and the service life can be greatly reduced. If the battery pack does not adopt proper heat management measures, thermal runaway can even be caused in some extreme cases, and dangerous accidents are caused.
The air-cooled power battery heat management mode is widely applied due to the fact that the system is simple in structure, small in occupied space, light in weight, high in flexibility, low in energy consumption, low in cost, free of harmful gas accumulation and easy to maintain; however, in the air cooling system, the specific heat capacity of air is small, the heat conduction coefficient is low, the heat convection coefficient is small, the time required for heat dissipation is long, the cooling effect with high charging and discharging multiplying power is poor, the pressure difference between an inlet and an outlet of the whole system is large, the flow field is uneven, and the difference of cooling conditions among batteries in the battery pack can cause the battery pack to generate large temperature difference. In the design of traditional power battery air-cooling thermal management system, often because the difference of battery self structural anisotropy and cooling system runner structure causes cold wind temperature to flow through the battery bellows along with it easily, rises gradually along the flow direction, leads to between electric core and the electric core among the air-cooling system, and the temperature between module and the module is inhomogeneous. Many scholars improve the air flow condition in the system by adjusting the structure of the air cooling system, thereby improving the heat dissipation performance of the air cooling system.
Most of the current thermal management schemes for the power batteries on the market are arranged at the bottom or the side of the batteries, and few thermal management schemes are arranged at the top of the batteries. However, most of the power batteries at present are composed of a positive electrode, a diaphragm, a negative electrode and a battery shell, the diaphragm is made of a material with low thermal conductivity, the thermal resistance from the inside of the battery core to the direction vertical to the surface is large, the thermal conductivity is poor, and the heat transfer effect is poor.
In summary, in the technical field of power battery thermal management, an air-cooled power battery thermal management system which can efficiently thermally manage battery tabs, ensure that batteries are used in an optimal working temperature range, improve the temperature uniformity of a power battery thermal management system, and integrate the functions of heat dissipation and preheating is urgently needed.
Disclosure of Invention
The invention aims to provide a power battery thermal management system based on a tab air cooling mode, which can enable a battery module to work in a proper temperature range and timely and quickly carry away heat generated at a tab of a battery, thereby ensuring the safety, dynamic property, economy and reliability of the whole power battery thermal management system.
The purpose of the invention is realized as follows:
the invention relates to a power battery thermal management system based on a tab air cooling mode, which is characterized in that: the battery module comprises an external circulation air cooling unit and an internal circulation air cooling unit, wherein electric cores are connected through a connecting bar to form a battery module, an insulating heat conduction isolation frame is arranged above a lug of the battery module, and a first lug air cooling pipeline and a second lug air cooling pipeline are arranged above the insulating heat conduction isolation frame; the external circulation air cooling unit comprises a first external circulation fan, a second external circulation fan, a first air inlet branch, a second air inlet branch, a first air return branch and a second air return branch, a first lug air cooling pipeline is respectively communicated with the first air inlet branch and the first air return branch, a second lug air cooling pipeline is respectively communicated with the second air inlet branch and the second air return branch, a first air inlet air speed and air quantity sensor and a first air inlet air temperature sensor are sequentially arranged on the first air inlet branch, the first external circulation fan, set up the second air intake wind speed air quantity sensor, second air intake wind temperature sensor, second external circulation fan on the second branch of air intake in proper order, set up the second return air temperature sensor, second return air wind speed air quantity sensor, second return air quantity control valve on the first branch of return air in proper order, set up the first return air temperature sensor, first return air wind speed air quantity sensor, first return air quantity control valve on the second branch of return air in proper order; the internal circulation air cooling unit comprises an internal circulation pipe, an internal circulation fan, a plate heat exchanger and a heater, wherein the heater and the internal circulation fan are arranged on the internal circulation pipe, the internal circulation pipe between the heater and the internal circulation fan is respectively connected with a first external circulation fan, a second external circulation fan, a first return air volume regulating valve and a second return air volume regulating valve, a first heat exchange three-way reversing valve is respectively connected with the heater and the plate heat exchanger, and a second heat exchange three-way reversing valve is respectively connected with the internal circulation fan and the plate heat exchanger.
The present invention may further comprise:
1. the refrigeration system is characterized by further comprising a compressor unit refrigeration unit, the compressor unit refrigeration unit comprises a compressor, an evaporator, a condenser and an expansion valve, a high-pressure meter and a high-pressure protector are arranged on a pipeline between the compressor and the condenser, a low-pressure meter and a low-pressure protector are arranged on a first pipeline between the compressor and the evaporator, a manual valve and a thermal electromagnetic valve are arranged on a second pipeline between the compressor and the evaporator, a refrigeration main pipeline and a liquid spraying branch pipeline which are connected in parallel are arranged between the condenser and the evaporator, the refrigeration main pipeline is provided with the refrigeration electromagnetic valve and the expansion valve, the liquid spraying electromagnetic valve is arranged on the liquid spraying branch pipeline, and the evaporator is connected with a first heat exchange three.
2. When the heat generating power of the battery module is smaller than the set value, the first heat exchange three-way reversing valve and the second heat exchange three-way reversing valve communicate the internal circulation air cooling unit, cold air is blown out through the first external circulation fan and the second external circulation fan and is blown into a first lug air cooling pipeline and a second lug air cooling pipeline of the battery module to dissipate heat of the battery module, and after the return air is cooled down, the return air is returned from a return air first branch and a return air second branch to form air cooling external circulation; when the heat generating power of the battery is equal to or greater than a set value, a refrigerating unit of the compressor unit is started to cool air blown out by the internal circulating fan; when the refrigerating unit of the compressor unit cannot meet the cold air requirement, simultaneously starting the refrigerating unit of the compressor unit and the internal circulation air cooling unit; when the battery module is under extreme low temperature working condition, when needing to heat the battery module, the heater in the air cooling unit of inner loop starts, heats the wind that the inner loop fan blew out, realizes preheating the battery module.
The invention has the advantages that:
1. according to the invention, two independent air cooling channels are arranged, the pipe diameter of the air cooling pipeline is larger than or equal to the width of the battery tab, and the two independent air cooling pipelines are used for air cooling the tab of the battery module, so that the contact thermal resistance of the traditional air cooling can be greatly reduced, and the thermal management efficiency of the power battery is improved. The air volume adjusting valves and the air temperature and air speed and air volume sensors are arranged on the two independent air cooling channels, so that real-time collection and monitoring of parameters can be realized, and the air volume of each air cooling channel is independently and actively controlled according to the temperature conditions of the battery cells at different positions, so that the temperature uniformity of the heat management system is improved.
2. According to the invention, the insulating heat-conducting isolation frame is arranged between the lug air-cooling pipe and the connecting bar, so that the risk of external short circuit in the operation process of the heat management system can be reduced, and the heat exchange effect of the lug connecting bar and the air-cooling pipe is improved. The air-cooled internal circulation unit is provided with the heater, so that the functions of heat dissipation and preheating can be integrated, the cold start performance of the power battery is improved, and the safety and the reliability of a power battery thermal management system are greatly enhanced.
3. Through setting up compressor unit cold wind main trunk way and the vice branch road of plate heat exchanger cold wind, can be according to the heat production power of battery module, corresponding to corresponding heat dissipation demand, select cold wind main trunk way or the vice branch road of cold wind, battery module heat production power is very high, two passageways simultaneous workings. The invention can reduce unnecessary energy consumption of the whole system when the heat generation of the battery module is low, and save energy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of a battery tab heat dissipation unit.
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 a power battery thermal management system based on a tab air cooling mode, two independent air cooling channels are arranged right above a tab of a battery module, an insulating heat conduction isolation frame is arranged between a tab connecting row and a tab air cooling pipe, and heat conduction silicone grease is coated between a battery cell and the side surface of the battery cell to reduce air thermal resistance. The invention changes the traditional heat dissipation of the side surface and the bottom of the battery cell into the air cooling heat dissipation of the lug at the top of the battery cell, thereby greatly reducing the heat exchange thermal resistance, increasing the temperature uniformity of the battery cell at different positions in the system and improving the operation efficiency of the heat management system.
As shown in fig. 1, the invention relates to a thermal management system for a power battery based on air cooling heat dissipation of a tab, which comprises: the battery comprises a battery core 1, a connecting bar 2, a battery module 3, a positive electrode tab 4, a negative electrode tab 5, inlet air speed and air quantity sensors 6a and 6b, return air speed and air quantity sensors 6c and 6d, inlet air temperature sensors 7a and 7b, return air temperature sensors 7c and 7d, external circulating fans 8a and 8b, return air quantity regulating valves 9a and 9b, a heater 10, heat exchange three-way reversing valves 11a and 11b, a low-voltage protector 12, a low-voltage meter 13, a compressor 14, a high-voltage meter 15, a high-voltage protector 16, a condenser 17, a condenser cooling fan 18, a condenser cooling fin 19a, manual valves 20a, 20b and 20c, a drying filter 21, a refrigeration electromagnetic valve 22, an expansion valve 23, a liquid spraying electromagnetic valve 24, a thermal electromagnetic valve 25, an evaporator 26, a plate heat exchanger 27, a plate heat exchanger cooling fin 19b, an internal circulating fan 28, and an inlet air, A second air inlet branch 29b, a first air return branch 30a and a second air return branch 30 b.
A thermal management system of a power battery based on a tab air cooling mode is implemented by the following connection relations: the plurality of connecting rows 2 are connected with the positive pole lug 4 and the negative pole lug 5 of the battery cell to form a battery module 3. An insulating heat conduction isolation frame is arranged right above a lug of the battery module 3, and a lug air cooling pipe is arranged right above the insulating heat conduction isolation frame. In the outer circulation air cooling unit, two independent lug air cooling channels respectively consist of an outer circulation fan, an inlet air temperature sensor, an inlet air speed and air quantity sensor, a return air temperature sensor, a return air speed and air quantity sensor and a return air quantity regulating valve, and the two independent lug air cooling channels respectively pass through two rows of lugs of the battery module. The air-cooled internal circulation unit is provided with an internal circulation fan and a heater, one side of one heat exchange three-way reversing valve is connected with the heater, the other two sides of the heat exchange three-way reversing valve are respectively connected with an evaporator cold air pipe and a plate heat exchanger cold air pipe, and the plate heat exchanger 27 is provided with plate heat exchanger radiating fins 19 b. One side of the other heat exchange three-way reversing valve is connected with an internal circulation fan 28, and the other two sides are respectively connected with an evaporator cold air pipe and a heat exchanger cold air pipe. The compressor unit refrigeration unit is connected by four parts, namely a compressor 14, an evaporator 26, a condenser 17 and an expansion valve 23, and comprises three passages, namely a main refrigeration passage, a branch liquid passage and a hot bypass passage. A high-pressure meter 15 and a high-pressure protector 16 are arranged on a pipeline between a compressor 14 and a condenser 17, a low-pressure meter 13 and a low-pressure protector 12 are arranged on a pipeline between the compressor 14 and an evaporator 26, a heating power electromagnetic valve 25 is arranged on a pipeline between the compressor 14 and the condenser 17, a drying filter 21 is arranged on a pipeline between the condenser 17 and the evaporator 26, then a refrigeration main path and a liquid spraying branch path are formed by arranging a refrigeration electromagnetic valve 22 and a liquid spraying electromagnetic valve 24 which are connected in parallel, the refrigeration electromagnetic valve 22 on the refrigeration main path is connected with an expansion valve 23, and finally the refrigeration main path and the liquid spraying branch path are connected with the evaporator 26 to form a complete cold air unit. The condenser is provided with a condenser radiating fan 18 for radiating heat, heat exchange is enhanced through a condenser radiating fin 19a, a refrigerant flowing out of the condenser 17 is processed through a drying filter 21, and pipeline blockage in a refrigeration system can be prevented.
In this embodiment, the battery module charges or discharges, and battery module 3 heat production, the system is according to the size of the 3 heat production power of battery module, and the refrigeration unit selects the compressor unit refrigeration module of operation or plate heat exchanger bypass module to come cold wind. When the heat power of the battery module is very small, the heat exchange three-way reversing valve 11a, 11b communicates the internal circulation pipeline with the plate heat exchanger 27, the system selects the plate heat exchanger bypass module to cool the air blown from the internal circulation loop, at the moment, cold air is blown out through the external circulation fan 8, the cold air flows through the inlet air temperature sensor and the inlet air speed and air quantity sensor, the cold air is blown to the lug air cooling pipeline of the battery module 3, the battery module 3 is cooled, after the return air is cooled, the air returns from the return air inlet, and passes through the return air temperature sensor and the return air speed and air quantity sensor, so that the air cooling external circulation is formed. The air volume of the whole process can be controlled by air volume adjusting valves 9a and 9b on the loop of the air-cooled external circulation unit. When the heat generating power of the battery exceeds a certain range, the compressor 14, the condenser 17, the refrigeration electromagnetic valve 22, the expansion valve 23 and the evaporator 26 are started and work in a matched mode, and air blown out by the internal circulation fan is cooled and then is communicated to the lug air cooling pipe to conduct heat management on the battery. When the single compressor unit refrigeration module cannot meet the cold air requirement, the system simultaneously starts the compressor unit main circuit refrigeration module and the plate heat exchanger 27 bypass refrigeration module so as to meet the high heat dissipation requirement of the system. When the battery module 3 is under the extreme low temperature working condition and the battery module 3 needs to be heated, the heater 10 in the air-cooled internal circulation unit is started, the air blown out by the heating internal circulation fan 28 blows the tab air-cooled tubes above the two rows of tabs of the battery module 3 through the external circulation fans 8a and 8b, and the battery module 3 is efficiently preheated.
The invention relates to a power battery thermal management system based on a tab air cooling mode, which comprises a battery tab heat dissipation unit, a compressor set main cold air unit, a plate heat exchanger auxiliary cold air unit, an air cooling internal circulation unit and an air cooling external circulation unit, wherein the compressor set main cold air unit is connected with the air cooling external circulation unit; the air-cooled external circulation unit is provided with two independent air-cooled channels. The battery tab heat dissipation unit comprises a battery core, a positive tab, a negative tab, a connecting bar, a battery module and a tab air cooling pipe; for the battery cells with the bolt holes on the positive and negative pole lugs, connecting a plurality of battery cells into a battery module through a connecting row, arranging through holes matched with the hole diameters of the lug bolts on the connecting row, and compensating the dimensional tolerance of the screw holes and the bolts by using copper gaskets; for the battery cell without the bolt hole on the positive and negative electrode lugs, welding the connecting bar and the battery cell lugs into a battery module by a laser welding technology; and heat-conducting silicone grease is coated between the battery cell and the side surface of the battery cell.
The two independent air cooling channels arranged in the air cooling external circulation unit comprise a lug air inlet 1 branch, a lug air inlet 2 branch, a lug air return 1 branch and a lug air return 2 branch; each lug air inlet branch is provided with an external circulating fan, an air inlet temperature sensor and an air inlet speed and air volume sensor; each lug air return branch is provided with an air quantity regulating valve, an air return temperature sensor and an air return speed and air quantity sensor; the air-cooled external circulation pipeline sequentially passes through the external circulation fan, the air inlet air temperature sensor, the air inlet air speed and air quantity sensor, the battery tab, the air quantity regulating valve, the return air temperature sensor and the return air speed and air quantity sensor.
The lug air cooling pipeline is arranged right above the lugs of the battery module, an insulating heat conduction isolation frame is arranged between the lug air cooling pipes and the battery lug connecting rows, and the width of each air cooling pipe is larger than or equal to that of each row of battery cell lugs; the air-cooled external circulation unit is provided with two independent air-cooled channels which respectively pass through two rows of lugs of the battery module. The air-cooled internal circulation unit comprises an internal circulation fan, a heater and an internal circulation pipeline; a three-way reversing valve is arranged and connected with an air-cooled internal circulation pipe, an evaporator cold pipe on a refrigeration main path of the compressor unit and a plate heat exchanger on a refrigeration bypass; the air-cooled internal circulation unit is connected with the refrigerating unit of the compressor unit at the evaporator, the air-cooled internal circulation unit is connected with the air-cooled external circulation unit through an air pipe, and the system is provided with a cold air main path and a bypass and integrates the functions of heat dissipation and preheating. The whole power battery thermal management system comprises a compressor unit cold air main path and a plate heat exchanger cold air bypass, wherein a compressor unit refrigerating unit comprises a compressor, a condenser, an evaporator, an expansion valve, a refrigerating electromagnetic valve, a liquid spraying electromagnetic valve, a heating power electromagnetic valve, a drying filter, a manual valve, a high-pressure meter, a high-pressure protector, a low-pressure meter, a low-pressure protector and a cooling fan and a cooling fin arranged on the condenser; the simple heat exchanger heat exchange module comprises a plate heat exchanger and two three-way valves, and radiating fins are arranged on the plate heat exchanger.
In summary, the following steps: the invention relates to a power battery thermal management system based on a tab air cooling mode, which improves the traditional thermal management mode, wherein cold pipes are arranged on the side surface and the bottom of a battery, the tab air cooling pipes are arranged right above two rows of tabs of a battery module, and an insulating heat conduction isolation frame is clamped between a tab connecting row and the tab air cooling pipes. The invention integrates the functions of heat dissipation and preheating, ensures the temperature of the battery to be in a proper working temperature range, and increases the application scenes of the whole air-cooled battery thermal management system. The two air channels are independently controlled, the opening degree of the air volume valve can be adjusted by monitoring the temperature of the battery cells at different positions, and the temperature uniformity is improved. According to different heat-generating powers of the battery module, the battery module is matched with corresponding heat-dissipation control strategies according to different heat-dissipation requirements, so that unnecessary energy consumption in the operation process of the whole heat management system can be avoided.
Claims (3)
1. The utility model provides a power battery thermal management system based on utmost point ear forced air cooling mode which characterized by: the battery module comprises an external circulation air cooling unit and an internal circulation air cooling unit, wherein electric cores are connected through a connecting bar to form a battery module, an insulating heat conduction isolation frame is arranged above a lug of the battery module, and a first lug air cooling pipeline and a second lug air cooling pipeline are arranged above the insulating heat conduction isolation frame; the external circulation air cooling unit comprises a first external circulation fan, a second external circulation fan, a first air inlet branch, a second air inlet branch, a first air return branch and a second air return branch, a first lug air cooling pipeline is respectively communicated with the first air inlet branch and the first air return branch, a second lug air cooling pipeline is respectively communicated with the second air inlet branch and the second air return branch, a first air inlet air speed and air quantity sensor and a first air inlet air temperature sensor are sequentially arranged on the first air inlet branch, the first external circulation fan, set up the second air intake wind speed air quantity sensor, second air intake wind temperature sensor, second external circulation fan on the second branch of air intake in proper order, set up the second return air temperature sensor, second return air wind speed air quantity sensor, second return air quantity control valve on the first branch of return air in proper order, set up the first return air temperature sensor, first return air wind speed air quantity sensor, first return air quantity control valve on the second branch of return air in proper order; the internal circulation air cooling unit comprises an internal circulation pipe, an internal circulation fan, a plate heat exchanger and a heater, wherein the heater and the internal circulation fan are arranged on the internal circulation pipe, the internal circulation pipe between the heater and the internal circulation fan is respectively connected with a first external circulation fan, a second external circulation fan, a first return air volume regulating valve and a second return air volume regulating valve, a first heat exchange three-way reversing valve is respectively connected with the heater and the plate heat exchanger, and a second heat exchange three-way reversing valve is respectively connected with the internal circulation fan and the plate heat exchanger.
2. The power battery thermal management system based on the tab air cooling mode as claimed in claim 1, wherein: the refrigeration system is characterized by further comprising a compressor unit refrigeration unit, the compressor unit refrigeration unit comprises a compressor, an evaporator, a condenser and an expansion valve, a high-pressure meter and a high-pressure protector are arranged on a pipeline between the compressor and the condenser, a low-pressure meter and a low-pressure protector are arranged on a first pipeline between the compressor and the evaporator, a manual valve and a thermal electromagnetic valve are arranged on a second pipeline between the compressor and the evaporator, a refrigeration main pipeline and a liquid spraying branch pipeline which are connected in parallel are arranged between the condenser and the evaporator, the refrigeration main pipeline is provided with the refrigeration electromagnetic valve and the expansion valve, the liquid spraying electromagnetic valve is arranged on the liquid spraying branch pipeline, and the evaporator is connected with a first heat exchange three.
3. The power battery thermal management system based on the tab air cooling mode as claimed in claim 2, wherein: when the heat generating power of the battery module is smaller than the set value, the first heat exchange three-way reversing valve and the second heat exchange three-way reversing valve communicate the internal circulation air cooling unit, cold air is blown out through the first external circulation fan and the second external circulation fan and is blown into a first lug air cooling pipeline and a second lug air cooling pipeline of the battery module to dissipate heat of the battery module, and after the return air is cooled down, the return air is returned from a return air first branch and a return air second branch to form air cooling external circulation; when the heat generating power of the battery is equal to or greater than a set value, a refrigerating unit of the compressor unit is started to cool air blown out by the internal circulating fan; when the refrigerating unit of the compressor unit cannot meet the cold air requirement, simultaneously starting the refrigerating unit of the compressor unit and the internal circulation air cooling unit; when the battery module is under extreme low temperature working condition, when needing to heat the battery module, the heater in the air cooling unit of inner loop starts, heats the wind that the inner loop fan blew out, realizes preheating the battery module.
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| CN202010232862.2A CN111342167B (en) | 2020-03-28 | 2020-03-28 | Power battery thermal management system based on pole lug air cooling mode |
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| CN202010232862.2A CN111342167B (en) | 2020-03-28 | 2020-03-28 | Power battery thermal management system based on pole lug air cooling mode |
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| CN111342167B (en) | 2022-04-29 |
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