CN106985657B - Battery and motor combined heat management system and heat management method for new energy pure electric bus - Google Patents
Battery and motor combined heat management system and heat management method for new energy pure electric bus Download PDFInfo
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- CN106985657B CN106985657B CN201710185697.8A CN201710185697A CN106985657B CN 106985657 B CN106985657 B CN 106985657B CN 201710185697 A CN201710185697 A CN 201710185697A CN 106985657 B CN106985657 B CN 106985657B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
- B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
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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
- H01M10/613—Cooling or keeping cold
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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
- H01M10/62—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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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 relates to a new-energy pure electric bus battery and motor combined thermal management system and a thermal management method. The thermal management system includes a heat dissipation module, a heat generating module, and a control module. The heat dissipation module comprises a heat sink and a heat dissipation fan connected with the heat sink. The heat generating module includes a motor and a motor controller coupled to the motor. The control module comprises a vehicle control unit and a power lithium battery management system connected with the vehicle control unit through a signal line. Still include the circulation module, the circulation module includes first and second circulating water pump, circulation pipeline, first three way valve, second three way valve, first solenoid valve and second solenoid valve. The invention not only can effectively carry out heat management on the power lithium battery and the driving motor so that the power lithium battery and the driving motor work in the most appropriate temperature range to exert the optimal use performance, but also can reduce the quality and the cost of the whole vehicle, effectively utilize the heat generated in the operation process of the driving motor and the motor controller and save energy.
Description
Technical Field
The invention relates to the technical field of pure electric buses, in particular to a battery and motor combined thermal management system and a thermal management method of a new-energy pure electric bus.
Background
With the strong support of our country on new energy automobiles, new energy automobiles in our country have been developed rapidly. The rapid development is achieved for both the output and sales of new energy vehicles and key parts such as lithium batteries and motors. The new energy automobile industry in China is already in the initial scale and formally enters the development stage. However, due to the inherent properties of key parts of the new energy pure electric bus, such as a power lithium battery and a driving motor, for example, the working temperature range of the lithium battery is limited within a certain temperature range, the performance of the lithium battery can be well exerted within the temperature range, and the electric bus can also obtain better service performance. And driving motor must produce the heat in the course of the work, must give the motor heat dissipation and just can make the motor normally work, and the high temperature seriously influences the motor performance, if permanent magnet synchronous motor can lead to risks such as silicon steel sheet demagnetization under high temperature. Therefore, effective thermal management is required for both the power lithium battery and the driving motor.
The protection grade of the motor is IP67, a liquid cooling mode is adopted, the lithium battery is also adopted based on the protection grade of the IP67, and the motor is provided with a set of cooling circulation system and the lithium ion power battery is also provided with a set of liquid cooling circulation system. Although the preset cooling effect is achieved in the practical process, the application of the two sets of systems not only improves the cost of the whole vehicle, but also brings difficulty to the arrangement of the whole vehicle, the quality of the whole vehicle can be increased under the condition of arranging the two water tanks to influence the driving range of the pure electric passenger vehicle, and the driving range is a very important technical index for a terminal user, so that the quality of the whole vehicle is reduced under the condition that the total electric quantity of the battery and parts such as the motor are matched, the power lithium battery and the driving motor are ensured to work in the most appropriate temperature range, the optimal performance of the power battery and the motor can be exerted, and the use requirement of a customer is met to the maximum extent.
Disclosure of Invention
The invention aims to provide a new energy pure electric bus battery and motor combined thermal management system and a thermal management method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a new energy pure electric bus battery motor combined thermal management system comprises a heat dissipation module, a heat production module and a control module; the heat dissipation module comprises a radiator and a heat dissipation fan connected with the radiator; the heat generating module comprises a motor and a motor controller connected with the motor; the control module comprises a vehicle control unit and a power lithium battery management system connected with the vehicle control unit through a signal line. The thermal management system also includes a cycle module; the circulating module comprises a first circulating water pump, a second circulating water pump, a circulating pipeline, a first three-way valve, a second three-way valve, a first electromagnetic valve and a second electromagnetic valve; the first three-way valve comprises an inlet and two outlets; the second three-way valve includes two inlets and one outlet. The heat dissipation fan is controlled by the vehicle control unit and is powered by a 24V direct current power supply. According to the circulating water temperature, three states of no work of two cooling fans, work of one cooling fan and work of two cooling fans can be realized. The cooling liquid in the circulating module is glycol or water or a solution formed by mixing glycol and water according to different proportions. The circulating water pump is powered by a 24V direct-current power supply, and the circulating water pump and the motor run simultaneously to ensure the cooling of the motor.
The circulating pipeline comprises a first pipeline connected between a water outlet of the radiator and a water inlet of the first circulating water pump, a second pipeline connected between a water outlet of the first circulating water pump and a water inlet of the motor controller, a third pipeline connected between a water outlet of the motor controller and a water inlet of the motor, a fourth pipeline connected between a water outlet of the motor and the second electromagnetic valve, a fifth pipeline connected between an outlet II of the first three-way valve and the first electromagnetic valve, a sixth pipeline connected between the second electromagnetic valve and an inlet I of the second three-way valve, a seventh pipeline connected between the first electromagnetic valve and a water inlet of the battery pack, an eighth pipeline connected between a water outlet of the battery pack and an inlet II of the second three-way valve, and a ninth pipeline connected between an outlet of the second three-way valve and a water inlet of the radiator; the first three-way valve is arranged on the first pipeline; and the second circulating water pump is arranged on the fifth pipeline. The inlet of the first three-way valve is connected with the water outlet of the radiator, and the outlet of the first three-way valve is connected with the water inlet of the first circulating water pump.
Furthermore, a plurality of battery packs form a battery system, internal cooling pipelines of the battery packs are sequentially connected in series, and each battery comprises a plurality of battery modules; the internal cooling pipeline of the battery pack is flat, the interface between the internal cooling pipeline and the external pipeline is cylindrical, and the internal cooling pipeline is arranged in the battery pack in an S shape. Design like this can make cooling pipeline and battery module have abundant area of contact, effectively takes away the inside heat of battery package.
Furthermore, the radiator is made of aluminum alloy or copper alloy.
Further, the motor adopts a permanent magnet synchronous motor or an alternating current asynchronous motor. The cooling mode of motor is liquid cooling, and the protection level is IP67.
Furthermore, the circulating pipeline is made of copper alloy materials.
Furthermore, the first three-way valve and the second three-way valve are both made of copper alloy or aluminum alloy.
The invention also relates to a heat management method of the heat management system, which comprises the following steps:
the power lithium battery management system collects temperature and voltage information of the power lithium battery monomer in real time and uploads the collected information to the whole vehicle controller;
when the temperature of the power lithium battery is lower than a set threshold value, the vehicle control unit sends an instruction to the first electromagnetic valve and the second electromagnetic valve, so that high-temperature liquid in the fourth pipeline flows to the seventh pipeline, the second electromagnetic valve is blocked from flowing to a water outlet of the sixth pipeline, and meanwhile, low-temperature liquid in the fifth pipeline is blocked and cannot flow into the seventh pipeline; therefore, only the high-temperature liquid flows through the pipeline inside the battery pack, finally flows out of the battery pack through the eighth pipeline, flows into the ninth pipeline through the second three-way valve, and enters the radiator through the ninth pipeline for circulation;
when the temperature of the power lithium battery is higher than a set threshold value, the vehicle control unit sends a control instruction to the first electromagnetic valve and the second electromagnetic valve, so that high-temperature liquid in the fourth pipeline flows to the sixth pipeline, the water outlet of the second electromagnetic valve flowing to the seventh pipeline is blocked, low-temperature liquid in the fifth pipeline flows into the seventh pipeline, the low-temperature liquid flows through the pipeline inside the battery pack, finally flows out of the battery pack through the eighth pipeline, flows into the ninth pipeline through the second three-way valve, and enters the radiator through the ninth pipeline to circulate.
According to the technical scheme, the heat generated in the working process of the motor and the motor controller can be effectively utilized to heat the power lithium battery, so that energy is effectively utilized; and the power battery and the driving motor share one set of cooling equipment, so that the whole vehicle quality is reduced, and the whole vehicle cost is reduced.
Drawings
FIG. 1 is a schematic structural diagram of a thermal management system according to the present invention;
FIG. 2 is a liquid flow diagram of the entire thermal management system at low battery temperatures;
FIG. 3 is a fluid flow diagram of the overall thermal management system at high battery temperatures;
FIG. 4 is a schematic view of an S-shaped internal pipeline of a battery pack;
fig. 5 is a schematic diagram of a flat structure of the internal pipe of the battery pack.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the thermal management system for the new-energy pure electric bus shown in fig. 1-5 comprises a heat dissipation module 1, a heat generation module 3, a circulation module 2 and a control module. The heat dissipation module 1 includes a heat dissipation fan 1-1 and a heat sink 1-2. Heat generating module 3 includes motor 3-2 and motor controller 3-1. The circulating module 2 comprises a first circulating water pump 2-1, a second circulating water pump 2-6, a circulating pipeline (4-1-4-9), a first three-way valve 2-2, a second three-way valve 2-3, a first electromagnetic valve 2-4 and a second electromagnetic valve 2-5. The control system comprises a power lithium battery management system BMS and a vehicle control unit. The heat radiation fan 1-1 is fixed with the heat radiator 1-2, and carries out air cooling heat radiation on the liquid flowing through the heat radiator 1-2. The radiator 1-2 is connected with the first circulating water pump 2-1 through a first pipeline 4-1. The first three-way valve is arranged on the first pipeline 4-1, and the second circulating water pump 2-6 is arranged on the battery pack cooling pipeline 4-5. The inlet of the first three-way valve 2-2 is connected with the water outlet of the radiator, the outlet of the first three-way valve 2-2 is connected with the water inlet of the first circulating water pump 2-1, the outlet of the first three-way valve 2-2 is connected with the water inlet of the second circulating water pump 2-6, and the water outlet of the second circulating water pump 2-6 is connected with the first electromagnetic valve 2-4. The on-off of the battery pack cooling pipeline 4-5 is controlled by a second circulating water pump 2-6. One interface of the circulating water pump 2-1 is communicated with the radiator 1-2, and the other interface is connected with the motor controller 3-1 through a second pipeline 4-2. The motor controller 3-1 and the motor 3-2 are connected in series through a third pipeline 4-3. A second electromagnetic valve 2-5 is arranged on a fourth pipeline 4-4 led out from a water outlet of the motor, the flow direction of water can be controlled, one flow direction can directly flow through the second three-way valve 2-3 to flow through the radiator 1-2 again for cooling, and the other flow direction can flow through a thermal management pipeline 4-7 of the battery pack to heat the battery pack; the battery pack cooling pipeline 4-5 and the motor water outlet pipeline 4-4 are controlled by a first electromagnetic valve 2-4; under the control of the first electromagnetic valve and the second electromagnetic valve, only one of the two pipelines can be communicated with a battery heat management water inlet pipeline 4-7, and a water outlet pipe 4-8 of a cooling pipeline 5-1 in the battery pack is communicated with a radiator pipeline 4-9 through a second three-way valve 2-3. The water outlet pipeline of the motor is the fourth pipeline. The battery pack cooling line 4-5 is a fifth line. And the battery heat management water inlet pipeline is a seventh pipeline. And a water outlet pipe of the pipeline inside the battery pack is an eighth pipeline. The radiator pipeline is a ninth pipeline.
The working principle of the heat management system of the new-energy pure electric bus is as follows:
and the BMS acquires the temperature and the voltage of the power lithium battery monomer in real time and uploads the temperature and the voltage to the whole vehicle controller. When the temperature of the power lithium battery is low, the vehicle control unit sends an instruction to the first electromagnetic valve 2-4, the second electromagnetic valve 2-5 and the second circulating water pump 2-6, so that high-temperature liquid in the fourth pipeline 4-4 flows to the battery pack water inlet pipeline 4-7, the water outlet of the sixth pipeline 4-6 is blocked, low-temperature liquid in the battery pack cooling pipeline 4-5 is blocked and cannot flow into the battery pack water inlet pipeline 4-7, the second circulating water pump 2-6 stops working, only high-temperature water flows through the cooling pipeline 5-1 in the battery pack, finally flows out from the battery pack water outlet pipeline 4-8, flows into the radiator pipeline through the three-way valve 2-3, and flows into the radiator 1-2 again for circulation. When the temperature of the power lithium battery is high, the vehicle control unit sends an instruction to control the first electromagnetic valve 2-4, the second electromagnetic valve 2-5 and the second circulating water pump 2-6, so that the high-temperature liquid in the fourth pipeline 4-4 flows to the sixth pipeline 4-6, the water outlet of the battery pack water inlet pipeline 4-7 is blocked, the second circulating water pump 2-6 also starts to work, the low-temperature liquid in the battery pack cooling pipeline 4-5 flows into the battery pack water inlet pipeline 4-7, the low-temperature water flows through the cooling pipeline 5-1 in the battery pack, finally flows out from the battery pack water outlet pipeline 4-8, flows into the radiator pipeline through the three-way valve 2-3, and flows into the radiator 1-2 again for circulation.
The invention also relates to a thermal management method of the thermal management system of the new-energy pure electric bus, which comprises the following steps:
s1, in the running process of a vehicle, a slave control module of a power lithium battery management system transmits information such as the temperature and the voltage of a power battery to a master control module of the power lithium battery management system, the master control module transmits the information to a vehicle control unit, and the motor controller transmits the information such as the temperature of a motor to the vehicle control unit; and the vehicle control unit sends information to the electromagnetic valve, the fan and the circulating water pump according to the temperature conditions of the power battery and the motor, and controls the electromagnetic valve, the fan and the circulating water pump.
S2, in the running process of the vehicle, the circulating water pump 2-1 is always in a circulating state, under the condition that a battery thermal management system is not added, cooling liquid flows through the first pipeline 4-1 after being radiated by the radiator 1-2, flows into the motor controller 3-1 through the second pipeline 4-2 after flowing through the circulating water pump 2-1, flows into the motor 3-2 through the third pipeline 4-3, and finally flows into the radiator 1-2 through the fourth pipeline 4-4, the sixth pipeline 4-6 and the ninth pipeline 4-9 in sequence to complete circulation. According to the invention, a set of battery thermal management pipeline is added, and the flow direction of liquid in the circulating pipeline can be changed according to the temperature condition of the battery pack.
As shown in fig. 2, the flow direction of the circulating liquid when the temperature of the battery pack is low: if the temperature in the battery pack 5 is lower than the set temperature value, the vehicle control unit sends a signal to the first electromagnetic valve 2-4 and the second electromagnetic valve 2-5 after receiving temperature data from the power lithium battery management system BMS, the flow direction and the plugging direction of the first electromagnetic valve 2-4 and the second electromagnetic valve 2-5 are controlled, the second electromagnetic valve 2-5 is conducted in the direction of flowing to the seventh pipeline 4-7 and plugged in the direction of flowing to the sixth pipeline 4-6, the first electromagnetic valve 2-4 plugs cooling circulating liquid from the fifth pipeline 4-5, the second circulating water pump 2-6 stops working after receiving a signal of the vehicle control unit, and heating circulating liquid from the fourth pipeline 4-4 is conducted, so that high-temperature liquid passing through the motor controller 3-1 and the motor 3-2 flows through the cooling pipeline 5-1 in the battery pack, heats the battery pack, and finally flows out from the pipeline 5-1, and flows through the water inlet pipeline 4-8 and the second three-way valve 2-3, and flows through the radiator 1-2 and then flows into the radiator through the radiator 4-2 to circulate the radiator again.
When the temperature of the battery pack is low, the heat transfer process of the circulating liquid is as follows: circulating liquid flowing out of the radiator 1-2 flows into the motor controller 3-1 through the first pipeline 4-1, the circulating water pump 2-1 and the second pipeline 4-2, absorbs heat emitted by relevant parts of the motor controller 3-1, the temperature is increased, then the circulating liquid flows into the motor 3-2, the heat in the motor 3-2 is absorbed, and the temperature of the circulating liquid is continuously increased; then flows into the battery pack to exchange heat with the battery pack to dissipate heat.
For example, the temperature of the liquid flowing out of the radiator 1-2 is 20 ℃, the temperature of the liquid flowing through the motor controller 3-1 is 30 ℃, the temperature of the liquid flowing through the motor 3-2 is 45 ℃, the temperature of the liquid flowing through the battery pack is reduced to 35 ℃, and the liquid finally flows into the radiator 1-2 for radiating again, and the whole process is that the circulating liquid absorbs the heat generated by the motor controller 3-1 and the driving motor 3-2 and releases the heat to the battery pack, so that the aim of heating the battery pack is fulfilled.
As shown in fig. 3, the flow direction of the circulating liquid when the temperature of the battery pack is high: if the temperature in the battery pack 5 is higher than a set temperature value, the vehicle control unit sends a signal to the first electromagnetic valve 2-4, the second electromagnetic valve 2-5 and the second circulating water pump 2-6 after receiving temperature data from the power lithium battery management system BMS, the flowing direction and the plugging direction of the first electromagnetic valve 2-4 and the second electromagnetic valve 2-5 are controlled, the second electromagnetic valve 2-5 is plugged in the direction of flowing to the seventh pipeline 4-7 and is conducted in the direction of flowing to the sixth pipeline 4-6, the first electromagnetic valve 2-4 conducts cooling circulating liquid from the fifth pipeline 4-5, the second circulating water pump 2-6 also receives the signal of the vehicle control unit to start working, heating circulating liquid from the fourth pipeline 4-4 is plugged, at the moment, the two electromagnetic valves 2-4 and 2-5 are equivalently plugged in a resultant force manner to plug the heating circulating liquid from the fourth pipeline 4-4, and then the high-temperature liquid passing through the motor controller 3-1 and the motor 3-2 flows through the sixth pipeline 4-6 and the radiator inlet pipeline 1-2 to circulate the radiator again; and the cooling circulating liquid from the fifth pipeline 4-5 flows into the cooling pipeline 5-1 in the battery pack through the first electromagnetic valve 2-4 and the water inlet pipe 4-7 of the battery pack, finally flows through the second three-way valve 2-3 through the water outlet pipeline 4-8 of the battery pack, and the circulating liquid from the internal pipeline 4-8 of the battery pack at the position of the second three-way valve 2-3 is converged with the high-temperature liquid from the sixth pipeline 4-6 after heat exchange with the motor and the motor controller, and finally flows into the radiator 1-2 for circulation again. As shown in fig. 4 and 5, a plurality of battery packs 5 constitute a battery system, internal cooling pipelines of the plurality of battery packs 5 are connected in series in sequence, and each battery pack 5 includes a plurality of battery modules; the internal cooling pipeline 5-2 of the battery pack 5 is flat, the interface 5-3 between the internal cooling pipeline 5-2 and the external pipeline is cylindrical, and the internal cooling pipeline 5-2 is arranged in the battery pack 5 in an S shape, so that the internal pipeline of the battery pack and the battery pack have a large enough contact area, and heat exchange with the battery pack is well completed.
When the temperature of the battery pack is high, the heat transfer process of the circulating liquid is as follows: circulating liquid flowing out of the radiator 1-2 is divided into two paths, the first path flows into the motor controller 3-1 through the first pipeline 4-1, the circulating water pump 2-1 and the second pipeline 4-2, absorbs heat emitted by relevant parts of the motor controller 3-1, the temperature is increased, then the heat flows into the motor 3-2, the heat in the motor 3-2 is absorbed, and the temperature of the circulating liquid is continuously increased; flows through a sixth pipeline 4-6, a second three-way valve 2-3 and a radiator water inlet pipeline 4-9 and enters the radiator 1-2 again for circulation; and the second path of circulating liquid flows out of the radiator 1-2, then enters the battery pack 5 through the second circulating water pump 2-6, the cooling circulating pipeline 4-5 and the battery pack water inlet pipeline 4-7, absorbs the heat of the battery pack 5, increases the temperature, and then flows through the second three-way valve 2-3 and the radiator water inlet pipeline 4-9 to enter the radiator 1-2.
For example, the temperature of the liquid flowing out of the radiator is 20 ℃, the temperature of the first circulating liquid flow is 30 ℃ after the first circulating liquid flow passes through the motor controller 3-1, the temperature of the first circulating liquid flow passing through the motor controller 3-2 is 45 ℃, and the first circulating liquid flow finally flows into the radiator 1-2 to be radiated again; the temperature of the second path of circulating liquid is 20 ℃ when the second path of circulating liquid comes from the radiator 1-2, the temperature of the second path of circulating liquid is 35 ℃ after the second path of circulating liquid flows through the battery pack 5, and the second path of circulating liquid finally flows into the radiator 1-2 to be radiated again. The whole process is that the first path of circulating liquid absorbs heat generated by the motor controller and the driving motor, and the second path of circulating liquid absorbs heat of the battery pack.
S3, power regulation of the cooling fan:
when the temperature of a power battery is lower and needs to be heated, the vehicle controller monitors the temperature of the battery pack and the temperature of the motor in real time, under the condition that the cooling fan 1-1 is not started, circulating liquid from the radiator 1-2 flows through the motor controller 3-1 and the motor 3-2 and then flows through the battery pack 5, and as long as the temperature of the battery is in a set temperature interval and the temperature of the motor is also in the set temperature interval, the cooling fan 1-1 does not need to be started, and only the radiator 1-2 needs to be used for natural cooling; when the temperature of the motor is higher, one or two cooling fans are started to cool the circulating liquid under the condition that the temperature of the circulating liquid in the radiator is difficult to reduce without starting the cooling fans, so that the temperature of the motor is ensured to reach a reasonable working range.
When the temperature of the power battery is high and heat dissipation is needed, one heat dissipation fan 1-1 or two heat dissipation fans 1-1 are started, and as long as the temperature of the power battery is in a set temperature range and the temperature of the motor 3-2 is also in the set temperature range, the power of the heat dissipation fan 1-1 does not need to be increased; when the temperature of the circulating liquid is absorbed by the battery pack, the motor 3-2 and the motor controller 3-1, and then is circulated, the power of the cooling fan needs to be increased as long as one temperature of the power battery, the motor or the motor controller exceeds the working temperature range until the three work in a reasonable temperature range.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (7)
1. A new energy pure electric bus battery motor combined thermal management system comprises a heat dissipation module, a heat production module and a control module; the heat dissipation module comprises a radiator and a heat dissipation fan connected with the radiator; the heat generating module comprises a motor and a motor controller connected with the motor; the control module comprises a vehicle control unit and a power lithium battery management system connected with the vehicle control unit through a signal line; the method is characterized in that: the device also comprises a circulating module; the circulating module comprises a first circulating water pump, a second circulating water pump, a circulating pipeline, a first three-way valve, a second three-way valve, a first electromagnetic valve and a second electromagnetic valve; the first three-way valve comprises an inlet and two outlets; the second three-way valve comprises two inlets and one outlet;
the circulating pipeline comprises a first pipeline connected between a water outlet of the radiator and a water inlet of the first circulating water pump, a second pipeline connected between a water outlet of the first circulating water pump and a water inlet of the motor controller, a third pipeline connected between a water outlet of the motor controller and a water inlet of the motor, a fourth pipeline connected between a water outlet of the motor and the second electromagnetic valve, a fifth pipeline connected between an outlet II of the first three-way valve and the first electromagnetic valve, a sixth pipeline connected between the second electromagnetic valve and an inlet I of the second three-way valve, a seventh pipeline connected between the first electromagnetic valve and a water inlet of the battery pack, an eighth pipeline connected between a water outlet of the battery pack and an inlet II of the second three-way valve, and a ninth pipeline connected between an outlet of the second three-way valve and a water inlet of the radiator; the first three-way valve is arranged on the first pipeline; the second circulating water pump is arranged on a fifth pipeline; the inlet of the first three-way valve is connected with the water outlet of the radiator, and the outlet of the first three-way valve is connected with the water inlet of the first circulating water pump.
2. The new energy pure electric bus battery and motor combined thermal management system according to claim 1, characterized in that: the battery pack comprises a plurality of battery packs, the internal cooling pipelines of the battery packs are sequentially connected in series, and each battery pack comprises a plurality of battery modules; the internal cooling pipeline of the battery pack is flat, the interface between the internal cooling pipeline and the external pipeline is cylindrical, and the internal cooling pipeline is arranged in the battery pack in an S shape.
3. The new energy pure electric bus battery and motor combined thermal management system according to claim 1, characterized in that: the radiator is made of aluminum alloy or copper alloy.
4. The new energy pure electric bus battery and motor combined thermal management system according to claim 1, characterized in that: the motor adopts a permanent magnet synchronous motor or an alternating current asynchronous motor.
5. The new energy pure electric bus battery and motor combined thermal management system according to claim 1, characterized in that: the circulating pipeline is made of copper alloy materials.
6. The new energy pure electric bus battery and motor combined thermal management system according to claim 1, characterized in that: the first three-way valve and the second three-way valve are both made of copper alloy or aluminum alloy.
7. The method of thermal management of a thermal management system according to any one of claims 1~6 wherein: the method comprises the following steps:
the power lithium battery management system collects temperature and voltage information of the power lithium battery monomer in real time and uploads the collected information to the whole vehicle controller;
when the temperature of the power lithium battery is lower than a set threshold value, the vehicle control unit sends an instruction to the first electromagnetic valve and the second electromagnetic valve, so that high-temperature liquid in the fourth pipeline flows to the seventh pipeline, the second electromagnetic valve is blocked from flowing to a water outlet of the sixth pipeline, and meanwhile, low-temperature liquid in the fifth pipeline is blocked and cannot flow into the seventh pipeline; therefore, only the high-temperature liquid flows through the pipeline inside the battery pack, finally flows out of the battery pack through the eighth pipeline, flows into the ninth pipeline through the second three-way valve, and enters the radiator through the ninth pipeline for circulation;
when the temperature of the power lithium battery is higher than a set threshold value, the vehicle control unit sends a control instruction to the first electromagnetic valve and the second electromagnetic valve, so that high-temperature liquid in the fourth pipeline flows to the sixth pipeline, the water outlet of the second electromagnetic valve flowing to the seventh pipeline is blocked, low-temperature liquid in the fifth pipeline flows into the seventh pipeline, the low-temperature liquid flows through the pipeline inside the battery pack, finally flows out of the battery pack through the eighth pipeline, flows into the ninth pipeline through the second three-way valve, and enters the radiator through the ninth pipeline to circulate.
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