CN110444834B - Battery thermal management system of vehicle - Google Patents

Battery thermal management system of vehicle Download PDF

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Publication number
CN110444834B
CN110444834B CN201910773860.1A CN201910773860A CN110444834B CN 110444834 B CN110444834 B CN 110444834B CN 201910773860 A CN201910773860 A CN 201910773860A CN 110444834 B CN110444834 B CN 110444834B
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China
Prior art keywords
air
fan
battery pack
thermoelectric semiconductor
air outlet
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CN201910773860.1A
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CN110444834A (en
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郭灵聪
杨林
陈渊博
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Geely Power Train Co Ltd
Original Assignee
Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Royal Engine Components Co Ltd
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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • 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
    • 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
    • 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
    • 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
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6572—Peltier elements or thermoelectric devices
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Secondary Cells (AREA)

Abstract

The invention provides a battery thermal management system of a vehicle, and belongs to the field of batteries. The system comprises: the thermoelectric semiconductor heat exchange unit comprises a thermoelectric semiconductor, a first air heat exchanger and a second air heat exchanger, wherein one end of the first air heat exchanger is connected with a first air inlet pipeline, the other end of the first air heat exchanger is connected with a first air outlet pipeline, one end of the second air heat exchanger is connected with a second air inlet pipeline, and the other end of the second air heat exchanger is connected with a second air outlet pipeline; one end of the battery pack is connected with the first air outlet pipeline, and the other end of the battery pack is connected with a third air outlet pipeline; a fan unit disposed downstream of the third and second air outlet ducts for discharging air flows of the third and second air outlet ducts to the outside of the vehicle; and a control unit connected to both the thermoelectric semiconductor heat exchange unit and the fan unit, for controlling a voltage applied to the thermoelectric semiconductor and a power of the fan unit according to a temperature of the battery pack. The battery thermal management system has the advantages of good cooling effect, simple system and lower cost.

Description

Battery thermal management system of vehicle
Technical Field
The invention relates to the field of batteries, in particular to a battery thermal management system of a vehicle.
Background
At present, the power battery of the electric vehicle sold in the market mainly uses the lithium ion battery, and because the performance of the lithium ion battery has higher sensitivity to the temperature, if the temperature is lower than or higher than the working temperature range of the battery pack, the performance of the battery pack is obviously reduced. Therefore, it is important to cool or heat the battery pack so as to maintain the battery pack within a normal operating range.
The current common cooling modes of the vehicle-mounted battery mainly comprise: air-cooled, liquid-cooled, direct-cooled. The air-cooled power battery cooling system utilizes a cooling fan to suck air from the interior of a carriage into a power battery pack so as to achieve the purpose of cooling a battery, when the cooling system is utilized for adjusting the temperature of the battery, the temperature of the air in the carriage is greatly dependent on the temperature of the air in the carriage, the cooling effect is poor, an additional heating device is needed to heat the battery at low temperature, the heating efficiency is not high, and the performance of the power battery is unstable. The liquid cooling type and the direct cooling type have better cooling effect, but an additional heating device is also needed at low temperature, and the whole system is complex, high in cost and large in energy consumption.
Therefore, the existing battery thermal management system has the problems of poor cooling effect, complex system and high cost.
Disclosure of Invention
It is an object of the present invention to provide a battery thermal management system that provides good cooling, is simple in system, and is relatively low in cost.
In particular, the present invention provides a battery thermal management system for a vehicle, comprising:
the thermoelectric semiconductor heat exchange unit comprises a thermoelectric semiconductor, a first air heat exchanger and a second air heat exchanger, wherein the first air heat exchanger and the second air heat exchanger are respectively arranged at a first end and a second end of the thermoelectric semiconductor, which are opposite to each other, one end of the first air heat exchanger is connected with a first air inlet pipeline for introducing air, the other end of the first air heat exchanger is connected with a first air outlet pipeline, one end of the second air heat exchanger is connected with a second air inlet pipeline for introducing air, and the other end of the second air heat exchanger is connected with a second air outlet pipeline;
one end of the battery pack is connected with the first air outlet pipeline, and the other end of the battery pack is connected with a third air outlet pipeline;
a fan unit disposed downstream of the third air outlet duct and the second air outlet duct, for discharging the air flow of the third air outlet duct and the second air outlet duct to the outside of the vehicle; and
and the control unit is connected with the thermoelectric semiconductor heat exchange unit and the fan unit and is used for controlling the voltage applied to the thermoelectric semiconductor and the power of the fan unit according to the temperature of the battery pack so as to enable the first end of the thermoelectric semiconductor to heat or cool according to the heat exchange requirement of the battery pack and discharge the redundant heat or cold at the second end out of the vehicle through the fan unit.
Optionally, the fan unit comprises:
the air inlet end of the first fan is connected with the third air outlet pipeline and the second air outlet pipeline; and is
The control unit is configured to control the power of the first fan according to the temperature of the battery pack.
Optionally, the fan unit further comprises:
the first air inlet valve is arranged at the position, corresponding to the air inlet of the second air outlet pipeline, of the first fan;
the second air inlet valve is arranged at the air inlet of the first fan corresponding to the third air outlet pipeline;
the control unit is further configured to control the opening degrees of the first and second intake valves according to the temperature of the battery pack.
Optionally, the fan unit comprises:
the air inlet end of the second fan is connected with the second air outlet pipeline; and
the air inlet end of the third fan is connected with the third air outlet pipeline; and is
The control unit is further configured to control the power of the second fan and the third fan according to the temperature of the battery pack.
Optionally, the fan unit further comprises:
the third air inlet valve and the fourth air inlet valve are respectively arranged at the air inlets of the second fan and the third fan; and is
The control unit is further configured to control the opening degrees of the third and fourth intake valves according to the temperature of the battery pack.
Optionally, the battery thermal management system further includes:
and the air filter is arranged at the upstream of the first air inlet pipeline and the second air inlet pipeline and is used for filtering air.
Optionally, the air intake of the air filter is in communication with a passenger compartment of the vehicle.
Optionally, one or more of the air filter, the thermoelectric semiconductor heat exchange unit, the battery pack, or the fan unit is integrated with the tubing associated therewith.
The thermoelectric semiconductor heat exchange unit is used as the heat exchange unit, and the thermoelectric semiconductor has two working states of refrigeration and heating, so that the refrigeration or heating requirements of the battery pack can be met simultaneously. On one hand, the first end of the thermoelectric semiconductor is used for heating or cooling air so as to heat or cool the battery pack, and on the other hand, the cold energy or the heat generated by the second end of the thermoelectric semiconductor is discharged out of the vehicle, so that the heating or cooling effect of the battery pack is indirectly ensured.
Furthermore, the thermoelectric semiconductor heat exchange unit adjusts the temperature of the battery pack through the air medium, and compared with a liquid-cooled or direct-cooled heat exchange system with a good cooling effect in the prior art, the whole battery heat management system is simple in structure.
Furthermore, the thermoelectric semiconductor heat exchange unit is adopted to regulate and control the temperature of the battery pack, so that air entering the battery pack can be directly cooled without being influenced by the temperature in a carriage. The thermoelectric semiconductor heat exchange unit works independently, so that refrigeration and heating can be realized, the temperature of the battery pack is not regulated and controlled by a vehicle air conditioning system during cooling, the decoupling with the vehicle air conditioning system is realized, a compressor is not required to be started, and the energy consumption of a vehicle is reduced; the heating of the battery pack can be realized without an additional heating device during heating, so that the cost is reduced.
Furthermore, because the fan units are arranged at the downstream of the third air outlet pipeline and the second air outlet pipeline, the temperature difference between the cold end and the hot end of the thermoelectric semiconductor can be reduced, and the thermoelectric semiconductor can work in an energy efficiency ratio area.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic structural view of a battery thermal management system according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a battery thermal management system according to a second embodiment of the present invention;
fig. 3 is a schematic structural view of a battery thermal management system according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of a battery thermal management system according to a fourth embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic structural diagram of a battery thermal management system according to an embodiment of the present invention. As shown in fig. 1, the present invention provides a battery thermal management system for a vehicle, which may generally include a thermoelectric semiconductor heat exchange unit 30, a battery pack 50, a fan unit 70, and a control unit 100. The thermoelectric semiconductor heat exchange unit 30 includes a thermoelectric semiconductor 31, and a first air heat exchanger 33 and a second air heat exchanger 32 respectively disposed at opposite first and second ends of the thermoelectric semiconductor 31. The first terminal and the second terminal refer to heat exchange terminals of the thermoelectric semiconductor 31, for example, when a preset voltage is applied to the thermoelectric semiconductor 31, the first terminal starts cooling, and the second terminal starts heating; conversely, when a predetermined voltage is applied in the opposite direction to the thermoelectric semiconductor 31, the first terminal starts to heat while the second terminal cools. The air is heated or cooled after passing through a first air heat exchanger 33 at a first end and vice versa through a second air heat exchanger 32. The first air heat exchanger 33 has one end connected to the first air intake duct 20 for introducing air and the other end connected to the first air outlet duct 40, where the source of air may be inside or outside the vehicle. A second air inlet duct 80 for introducing air is connected to one end of the second air heat exchanger 32 and a second air outlet duct 90 is connected to the other end, where the source of air may be either inside or outside the vehicle as well. One end of the battery pack 50 is connected to the first air outlet duct 40, and the other end is connected to a third air outlet duct 60. The fan unit 70 is disposed downstream of the third and second air outlet ducts 60 and 90, and discharges the air flows of the third and second air outlet ducts 60 and 90 to the outside of the vehicle. The control unit 100 is connected to both the thermoelectric semiconductor heat exchange unit 30 and the fan unit 70, and is configured to control the voltage applied to the thermoelectric semiconductor 31 and the power of the fan unit 70 according to the temperature of the battery pack 50, so that the first end of the thermoelectric semiconductor 31 heats or cools according to the heat exchange requirement of the battery pack 50, and the excess heat or cold at the second end is discharged out of the vehicle through the fan unit 70. The control unit 100 may be a separately provided control module, or may be integrated into other controllers, such as a Battery Management System (BMS).
In the present embodiment, the thermoelectric semiconductor heat exchange unit 30 is used as a heat exchange unit, and the thermoelectric semiconductor 31 has two working states of cooling and heating, so that the cooling or heating requirements of the battery pack 50 can be met at the same time. On the one hand, the first end of the thermoelectric semiconductor 31 is used for heating or cooling air, so that the battery pack 50 is heated or cooled, on the other hand, cold energy or heat generated by the second end of the thermoelectric semiconductor 31 is discharged out of the vehicle, so that the heating or cooling effect of the battery pack 50 is indirectly ensured, and therefore, the battery thermal management system of the embodiment has the advantages of good cooling effect and high heat exchange efficiency, cold air or warm air can be rapidly output, the battery pack 50 is kept at a proper working temperature, and the service life of the battery pack 50 is prolonged.
In addition, the temperature of the thermoelectric semiconductor 31 can be adjusted correspondingly by the control unit 100 according to the actual heat exchange requirement of the battery pack 50, and the heat exchange process is convenient and efficient.
Further, the thermoelectric semiconductor heat exchange unit 30 adjusts the temperature of the battery pack 50 through the air medium, and compared with a liquid-cooled or direct-cooled heat exchange system with a better cooling effect in the prior art, the whole battery heat management system of the embodiment has a simpler structure.
Further, the thermoelectric semiconductor heat exchange unit 30 is adopted to regulate and control the temperature of the battery pack 50, so that the air entering the battery pack 50 can be directly cooled without being influenced by the temperature in the vehicle cabin. The thermoelectric semiconductor heat exchange unit 30 works independently, so that refrigeration and heating can be realized, the temperature of the battery pack 50 is not regulated and controlled by a vehicle air conditioning system during cooling, decoupling with the vehicle air conditioning system is realized, a compressor is not required to be started, and the energy consumption of the vehicle is reduced; the battery pack 50 can be heated without an additional heating device during heating, which is advantageous for cost reduction.
Further, since the fan unit 70 is disposed downstream of the third air outlet duct 60 and the second air outlet duct 90, the temperature difference between the cold side and the hot side of the thermoelectric semiconductor 31 can be reduced to operate in the high energy efficiency region.
As shown in fig. 1, the battery thermal management system further includes an air filter 10 disposed upstream of the first air intake duct 20 and the second air intake duct 80 for filtering air.
Optionally, the air intake of the air filter 10 is in communication with the passenger compartment of the vehicle. That is, the air to cool or heat the battery pack 50 is sourced from the passenger compartment within the vehicle, although as before, the air source could also be external to the vehicle. Flows into the thermoelectric semiconductor heat exchange unit 30 after passing through the air filter 10.
In one embodiment, as shown in fig. 1, the fan unit 70 includes a first fan 701 having an air inlet end connected to both the third air outlet duct 60 and the second air outlet duct 90. The control unit 100 is used to control the power of the first fan 701 according to the temperature of the battery pack 50.
Air cooled/heated for the battery pack 50 passes through the air filter 10 and then enters the thermoelectric semiconductor heat exchange unit 30. When the battery pack 50 needs to be cooled down, the control unit 100 applies a voltage to the thermoelectric semiconductor 31, the first end of the thermoelectric semiconductor 31 cools, the source air is cooled by the first air heat exchanger 33, enters the battery pack 50 to cool the battery, and finally the heat is exhausted to the outside by the first fan 701. Due to the characteristics of the thermoelectric semiconductor 31, when the first end cools, the second end generates heat at the same time, the temperature difference between the two ends affects the conversion efficiency, and the heat generated by the second end is also discharged to the outside through the second air heat exchanger 32 and the first fan 701, so that the temperature difference between the two ends of the thermoelectric semiconductor 31 is reduced, and the heat exchange efficiency is increased.
When the temperature of the battery pack 50 is low and heating is needed, the control unit 100 applies a reverse voltage to the thermoelectric semiconductor 31, the operation mode of the thermoelectric semiconductor 31 is adjusted to be that the first end heats and the second end cools, the first air heat exchanger 33 directly heats the air entering the battery pack 50 to provide heat for the battery pack 50 to reach a proper operation temperature, and the cold air generated at the lower end is also discharged to the outside by the second air heat exchanger 32 and the first fan 701.
Fig. 2 is a schematic structural diagram of a battery thermal management system according to a second embodiment of the present invention. In another embodiment, as shown in fig. 2, the fan unit 70 further comprises a first intake valve 71 and a second intake valve 72. The first air intake valve 71 is disposed at an air inlet of the first fan 701 corresponding to the second air outlet pipeline 90. The second air intake valve 72 is disposed at an air inlet of the first fan 701 corresponding to the third air outlet pipe 60. The control unit 100 is also configured to control the opening degrees of the first and second intake valves 71 and 72 according to the temperature of the battery pack 50.
That is, the control unit 100 may simultaneously control the thermoelectric semiconductor 31, the power of the first fan 701 and the opening degrees of the first and second intake valves 71 and 72 in front of the first fan 701 according to the cooling or heating requirement of the battery pack 50, so that the system operates at the highest efficiency from three aspects, and the opening degrees of the first and second intake valves 71 and 72 may be individually controlled, thereby achieving independent control of the discharge amounts of the second and third outlet ducts 90 and 60, and more precisely controlling the temperature.
Fig. 3 is a schematic structural diagram of a battery thermal management system according to a second embodiment of the present invention. As shown in fig. 3, in another embodiment, the fan unit 70 includes a second fan 73 and a third fan 74. The air inlet end of the second fan 73 is connected to the second air outlet pipe 90. The air inlet end of the third fan 74 is connected to the third air outlet duct 60. The control unit 100 is also used to control the power of the second fan 73 and the third fan 74 according to the temperature of the battery pack 50.
In this embodiment, two fans are provided to exhaust air separately, the controller can control the powers of the second fan 73 and the third fan 74 respectively, and the air output amounts of the second air outlet pipeline 90 and the third air outlet pipeline 60 can be adjusted to be different, so as to control the temperature difference between the two ends of the thermoelectric semiconductor 31 more accurately.
In one embodiment, the fan unit 70 further includes a third air intake valve and a fourth air intake valve. The third air intake valve is disposed at the air inlet of the second fan 73. The fourth intake valve is disposed at an air inlet of the third fan 74. The control unit 100 is also configured to control the opening degrees of the third and fourth intake valves according to the temperature of the battery pack 50.
By independently controlling the power of the second fan 73, the power of the third fan 74, the opening of the third air intake valve, and the opening of the fourth air intake valve, the temperature difference between the two ends of the thermoelectric semiconductor 31 can be further accurately controlled, which is beneficial to the operation of the battery pack 50 in a high energy efficiency ratio region, the heat exchange efficiency is improved, and the life of the battery pack 50 is prolonged.
In another embodiment, one or more of the air filter 10, the thermoelectric semiconductor heat exchange unit 30, the battery pack 50, or the fan unit 70 are integrated with the associated plumbing. The air filter 10 and the thermoelectric semiconductor heat exchange unit 30 may be integrated into the ventilation duct. Each ventilation duct may be a segment of duct, or may be integrated with the air filter 10, the thermoelectric semiconductor heat exchange unit 30, the battery pack 50, the exhaust fan, and the like.
Fig. 4 is a schematic structural diagram of a battery thermal management system according to a fourth embodiment of the present invention. In the embodiment shown in fig. 4, the first air intake duct 20, the first air outlet duct 40, the second air intake duct 80 and the thermoelectric semiconductor heat exchange unit 30 are integrated. The specific integrated components can be selected according to specific requirements, for example, according to the space inside the vehicle, the difficulty of assembly and the like, so that the number of assembly steps is reduced, and the spatial layout is more diversified.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (6)

1. A battery thermal management system for a vehicle, comprising:
the thermoelectric semiconductor heat exchange unit comprises a thermoelectric semiconductor, a first air heat exchanger and a second air heat exchanger, wherein the first air heat exchanger and the second air heat exchanger are respectively arranged at a first end and a second end of the thermoelectric semiconductor, which are opposite to each other, one end of the first air heat exchanger is connected with a first air inlet pipeline for introducing air, the other end of the first air heat exchanger is connected with a first air outlet pipeline, one end of the second air heat exchanger is connected with a second air inlet pipeline for introducing air, and the other end of the second air heat exchanger is connected with a second air outlet pipeline;
one end of the battery pack is connected with the first air outlet pipeline, and the other end of the battery pack is connected with a third air outlet pipeline;
the fan unit is arranged at the downstream of the third air outlet pipeline and the second air outlet pipeline and used for discharging airflow of the third air outlet pipeline and the second air outlet pipeline to the outside of the vehicle, and the fan unit comprises at least one fan and two air inlet valves which are respectively arranged at air inlets of the second air outlet pipeline and the third air outlet pipeline; and
and the control unit is connected with the thermoelectric semiconductor heat exchange unit and the fan unit and is used for controlling the voltage applied to the thermoelectric semiconductor, the power of the at least one fan and the opening degree of the two air inlet valves according to the temperature of the battery pack so that the first end of the thermoelectric semiconductor heats or cools according to the heat exchange requirement of the battery pack and the redundant heat or cold at the second end is discharged out of the vehicle through the fan unit.
2. The battery thermal management system of claim 1, wherein the fan unit comprises:
the air inlet end of the second fan is connected with the second air outlet pipeline; and
the air inlet end of the third fan is connected with the third air outlet pipeline; and is
The control unit is further configured to control the power of the second fan and the third fan according to the temperature of the battery pack.
3. The battery thermal management system of claim 2, wherein the fan unit further comprises:
the third air inlet valve and the fourth air inlet valve are respectively arranged at the air inlets of the second fan and the third fan; and is
The control unit is further configured to control the opening degrees of the third and fourth intake valves according to the temperature of the battery pack.
4. The battery thermal management system of any of claims 1-3, further comprising:
and the air filter is arranged at the upstream of the first air inlet pipeline and the second air inlet pipeline and is used for filtering air.
5. The battery thermal management system of claim 4,
the air intake of the air filter is in communication with a passenger compartment of the vehicle.
6. The battery thermal management system of claim 4,
one or more of the air filter, the thermoelectric semiconductor heat exchange unit, the battery pack or the fan unit are integrated with the pipeline connected with the air filter, the thermoelectric semiconductor heat exchange unit, the battery pack or the fan unit.
CN201910773860.1A 2019-08-21 2019-08-21 Battery thermal management system of vehicle Active CN110444834B (en)

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