WO2023249198A1

WO2023249198A1 - Battery heat management system for electric vehicle

Info

Publication number: WO2023249198A1
Application number: PCT/KR2023/002802
Authority: WO
Inventors: 박정권
Original assignee: 한국자동차연구원
Priority date: 2022-06-22
Filing date: 2023-02-28
Publication date: 2023-12-28
Also published as: KR20240000023A

Abstract

The present invention relates to a battery heat management system for an electric vehicle, comprising: a heat management unit that circulates a first heat exchange medium and exchanges heat with a battery module; a cycle unit that has a compressor, a condenser, an expansion valve, and an evaporator so as to circulate a second heat exchange medium; a heating unit that is branched off from the cycle unit and exchanges heat between the second heat exchange medium and the first heat exchange medium such that the temperature of the battery module increases; and a cooling unit that is branched off from the cycle unit and exchanges heat between the second heat exchange medium and the first heat exchange medium such that the temperature of the battery module decreases.

Description

Battery thermal management system for electric vehicles

The present invention relates to a battery thermal management system for electric vehicles, and more specifically, to a battery thermal management system for electric vehicles that can improve the output efficiency of a battery module.

This application claims priority from Korean Patent Application No. 10-2022-0076185 filed on June 22, 2022, and all contents disclosed in the specification and drawings of the application are incorporated by reference into this application.

In general, as interest in energy efficiency and environmental pollution issues has increased recently, the development of electric vehicles (EVs), which are eco-friendly vehicles that can practically replace internal combustion engine vehicles and run by driving a motor with power charged in a battery, has been growing. It is being done actively.

Electric vehicles are equipped with a thermal management system to perform thermal management of the entire vehicle. A thermal management system can be defined as a system in a broad sense, including the air conditioning system of an air conditioning device, a cooling system that uses coolant or refrigerant for thermal management and cooling of the power system, and a heat pump system.

Among these, the battery cooling system for electric vehicles controls the temperature of the power electronic components and the battery by circulating coolant along the coolant flow path of the battery that supplies operating power to the power electronic components for driving the vehicle. In recent electric vehicles, in order to increase the vehicle's range and improve fuel efficiency, two radiators are placed at the front of the vehicle and a parallel coolant line circulates through each radiator to separate the power electronic components and the battery for cooling. A water-cooled cooling system is used.

However, the conventional battery cooling system for electric vehicles has a complex structure, and the radiator placed at the front of the vehicle cools the coolant by heat exchange with the air outside the vehicle, so it takes up excessive installation space and causes the coolant to cool in a high temperature environment. There is a problem with low cooling efficiency.

The background technology of the present invention is disclosed in Korean Patent Publication No. 10-2017-014280 (published on December 28, 2017, title of the invention: Battery pack cooling system for electric vehicles).

The purpose of the present invention is to provide a battery thermal management system for electric vehicles that can improve the output efficiency of the battery module.

In order to solve the above-described problems, a battery thermal management system for an electric vehicle according to the present invention includes: a thermal management unit in which a first heat exchange medium circulates and exchanges heat with the battery module; a cycle unit including a compressor, condenser, expansion valve, and evaporator through which a second heat exchange medium is circulated; a heating unit branched from the cycle unit and heat-exchanging the second heat exchange medium with the first heat exchange medium to increase the temperature of the battery module; and a cooling unit branched from the cycle unit and heat-exchanging the second heat exchange medium with the first heat exchange medium to lower the temperature of the battery module.

Additionally, the heat management unit may include a first circulation section through which the first heat exchange medium circulates; a heat management member connected to the first circulation unit and heat-exchanging the first heat exchange medium with the battery module; It includes a chiller unit connected to the first circulation unit and heat-exchanging the first heat exchange medium with the second heat exchange medium.

Additionally, the heating unit includes a heat transfer unit branched between the compressor and the condenser and delivering the second heat exchange medium discharged from the compressor to the chiller unit; a heat recovery unit branched between the compressor and the evaporator and transferring the second heat exchange medium discharged from the chiller unit to the compressor; and a heating opening/closing unit that selectively opens and closes the heat transfer unit and the heat recovery unit.

Additionally, the cooling unit includes a cooling transfer unit branched between the compressor and the evaporator and delivering the second heat exchange medium discharged from the evaporator to the chiller unit; a cooling recovery unit branched between the compressor and the evaporator and transferring the second heat exchange medium discharged from the chiller unit to the compressor; and a cooling opening/closing unit that selectively opens and closes the cooling transfer unit and the cooling recovery unit.

Additionally, the heat transfer unit and the cooling transfer unit are connected to each other.

Additionally, the heating recovery unit and the cooling recovery unit are the same.

Additionally, a sensing unit that detects the temperature of the battery module; and a control unit that determines a thermal management mode based on the temperature change of the battery module measured by the sensing unit and controls operations of the heating unit and the cooling unit according to the determined thermal management mode.

In addition, the control unit executes a heating mode that operates the heating unit and stops the cooling unit when the temperature of the battery module detected by the sensing unit is lower than the first set temperature.

In addition, the control unit executes a cooling mode that operates the cooling unit and stops the operation of the heating unit when the temperature of the battery module detected by the sensing unit is higher than the second set temperature.

In addition, the control unit, when the temperature of the battery module detected by the sensing unit is greater than the first set temperature and less than the second set temperature, a buffer mode that stops both the heating unit and the cooling unit. Run.

The battery thermal management system for electric vehicles according to the present invention actively maintains the temperature of the battery module in the optimal efficiency range through a thermal management mode using a heating unit and a cooling unit, thereby preventing performance degradation of the battery module due to overheating and overcooling. You can.

In addition, the battery thermal management system for electric vehicles according to the present invention can eliminate the radiator installed in the front of the vehicle from the existing battery cooling system, thereby increasing space utilization and simplifying the overall system structure.

In addition, in the battery thermal management system for electric vehicles according to the present invention, the control unit provides a certain interval to the temperature for switching between the heating mode and the cooling mode, so that the heating unit and the cooling unit are connected in the process of switching between the heating mode and the cooling mode. This operates simultaneously to prevent the temperature of the battery module from changing in an unintended direction, and the heating unit and cooling unit repeatedly operate or stop based on a single temperature, which reduces the durability of the parts or causes unnecessary energy consumption. Consumption can be prevented.

1 is a block diagram schematically showing the configuration of a battery thermal management system for an electric vehicle according to an embodiment of the present invention.

Figure 2 is a diagram schematically showing the configuration of a battery thermal management system for an electric vehicle according to an embodiment of the present invention.

Figure 3 is a flowchart schematically showing the operation process of the thermal management mode by the control unit according to an embodiment of the present invention.

Figure 4 is a diagram schematically showing the operating state of the heating mode according to an embodiment of the present invention.

Figure 5 is a diagram schematically showing the operating state of the cooling mode according to an embodiment of the present invention.

Hereinafter, an embodiment of a battery thermal management system for an electric vehicle according to the present invention will be described with reference to the attached drawings.

In this process, the thickness of lines or sizes of components shown in the drawing may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, definitions of these terms should be made based on the content throughout this specification.

In addition, in this specification, when a part is said to be "connected (or connected)" to another part, this does not only mean that it is "directly connected (or connected)" but also "connected (or connected)" with another member in between. Also includes cases where there is an “indirect connection (or connection).” In this specification, when a part is said to “include (or include)” a certain component, this does not exclude other components, unless specifically stated to the contrary, but rather “includes (or includes)” other components. It means you can do it.

Additionally, the same reference numerals may refer to the same components throughout this specification. Even if the same or similar reference signs are not mentioned or explained in a particular drawing, the numbers may be explained based on other drawings. Additionally, even if there are parts that are not indicated by reference signs in a specific drawing, those parts can be explained based on other drawings. In addition, the number, shape, size, and relative differences in size of detailed components included in the drawings of the present application are set for convenience of understanding, do not limit the embodiments, and may be implemented in various forms.

The battery module 10 is a component that provides power for driving a motor of an electric vehicle, and may include a battery case (not shown) and a plurality of unit batteries (not shown) mounted within the battery case.

Figure 1 is a block diagram schematically showing the configuration of a battery thermal management system for an electric vehicle according to an embodiment of the present invention, and Figure 2 is a block diagram schematically showing the configuration of a battery thermal management system for an electric vehicle according to an embodiment of the present invention. It is a drawing.

1 and 2, the battery thermal management system for an electric vehicle according to an embodiment of the present invention includes a thermal management unit 100, a cycle unit 300, a heating unit 500, a cooling unit 700, and a sensing unit. (800), including a control unit (900).

The heat management unit 100 circulates the first heat exchange medium (A) and exchanges heat with the battery module 10. That is, the heat management unit 100 performs the function of controlling the temperature of the battery module 10 by heat exchange between the first heat exchange medium (A) and the battery module 10.

Here, the first heat exchange medium (A) may be exemplified by various types of coolant, liquid refrigerant, gas refrigerant, etc. that can transport heat energy through heat exchange action.

The thermal management unit 100 according to an embodiment of the present invention includes a first circulation unit 110, a thermal management member 120, and a chiller unit 130.

The first circulation unit 110 guides the flow of the first heat exchange medium (A) circulating through the heat management unit 100. The first circulation unit 110 according to an embodiment of the present invention is formed to have the shape of a pipe through which the first heat exchange medium (A) can flow. The first circulation unit 110 forms a closed flow path together with the heat management member 120 and the chiller unit 130, which will be described later, so that the first heat exchange medium (A) can circulate and flow along the extension direction. The specific length and arrangement of the first circulation unit 110 can be changed in various ways depending on the structure of the vehicle, the installation location of the heat management member 120 and the chiller unit 130, etc.

The first circulation part 110 includes a first circulation pump 111 that provides flow force to the first heat exchange medium (A) so that the first heat exchange medium (A) can flow smoothly along the first circulation part 110. ) can be installed.

The heat management member 120 is connected to the first circulation unit 110 and exchanges heat with the first heat exchange medium (A) with the battery module 10. The thermal management member 120 according to an embodiment of the present invention may be exemplified by various types of cooling plates that are installed to face the battery module 10 and perform thermal management of the battery module 10. Inside the heat management member 120, the first heat exchange medium (A) introduced from the first circulation unit 110 is circulated throughout the entire area of the heat management member 120 and induces heat exchange with the battery module 10. A flow path 121 is formed. The heat management passage 121 is connected to the first circulation section 110 on both sides. The heat management passage 121 receives the first heat exchange medium (A) discharged from the chiller unit 130, which will be described later, from the first circulation unit 110 to the inside through one side. The heat management passage 121 delivers the first heat exchange medium (A), which has completed heat exchange with the battery module 10, back to the first circulation unit 110 through the other side.

The chiller unit 130 is arranged to be spaced apart from the heat management member 120 and is connected to the first circulation unit 110. The chiller unit 130 combines the first heat exchange medium (A) delivered from the first circulation unit 110 and the second heat exchange medium (B) flowing along the heating unit 500 or cooling unit 700, which will be described later. It performs the function of heating or cooling the first heat exchange medium (A), which is transferred to the heat management member 120 by heat exchange.

The chiller unit 130 according to an embodiment of the present invention may be exemplified by various types of heat exchangers having a first chiller passage 131 and a second chiller passage 132 that are independent of each other formed therein. The first chiller passage 131 is connected at both ends to the first circulation section 110 to allow the first heat exchange medium (A) flowing through the first circulation section 110 to flow into the chiller section 130, and The first heat exchange medium (A) discharged from the unit 130 is delivered back to the first circulation unit 110. The second chiller flow path 132 is connected at both ends to the heating unit 500 and the cooling unit 700, which will be described later, and supplies the second heat exchange medium (B) flowing through the heating unit 500 and the cooling unit 700 to the chiller unit. It is introduced into the inside of (130), and the second heat exchange medium (B) discharged from the chiller unit (130) is delivered back to the heating unit (500) and the cooling unit (700). The first chiller passage 131 and the second chiller passage 132 are arranged adjacent to each other to induce a heat exchange action between the first heat exchange medium (A) and the second heat exchange medium (B) flowing inside.

The cycle unit 300 has a second circulation unit 310 in which the second heat exchange medium (B) circulates and flows, and the second heat exchange medium (B) flowing in the second circulation unit 310 in a gaseous state at high temperature and pressure. A compressor 320 that compresses, a condenser 330 that releases heat to the outside and condenses the compressed second heat exchange medium (B) into a liquid state, and the second heat exchange medium (B) condensed in the condenser 330 at a low temperature. , It is configured to include an expansion valve 340 that expands to a low-pressure liquid state and an evaporator 350 that absorbs heat from the outside and evaporates the second heat exchange medium (B) expanded in the expansion valve 340 into a gaseous state. . In addition, an accumulator 360 is installed between the compressor 320 and the evaporator 350 to transfer only the gaseous second heat exchange medium (B) to the compressor 320, and the condenser 330 and the expansion valve 340 A receiver dryer 370 that transmits only the second heat exchange medium (B) in a liquid state to the expansion valve 340 may be installed. The cycle unit 300 according to an embodiment of the present invention may be exemplified by an air conditioning device installed in a vehicle, a cooling device for electrical components, etc. Here, the second heat exchange medium (B) may be exemplified by various types of coolant, liquid refrigerant, gas refrigerant, etc. that can transport heat energy through heat exchange.

The heating unit 500 is branched from the cycle unit 300 and heat-exchanges the high-temperature, high-pressure second heat exchange medium (B) discharged from the compressor 320 with the first heat exchange medium (A) to form the battery module (10). It functions as a component that increases the temperature of.

The heating unit 500 according to an embodiment of the present invention includes a heat transfer unit 510, a heat recovery unit 520, and a heating opening/closing unit 530.

The heat transfer unit 510 is branched from the second circulation unit 310 connected between the compressor 320 and the condenser 330, and the high temperature and high pressure second heat exchange medium (B) discharged from the compressor 320 is transmitted to the chiller unit 130. That is, the heat transfer unit 510 diverts the flow of the second heat exchange medium (B), which is discharged from the compressor 320 and flows through the second circulation unit 310 at high temperature and high pressure, to the chiller unit 130. It functions as a composition.

The heat transfer unit 510 according to an embodiment of the present invention may be formed to have the shape of a pipe with one end in communication with the second circulation unit 310 connected between the compressor 320 and the condenser 330. The heat transfer unit 510 communicates with the second circulation unit 310, the other end of which is connected between the evaporator 350 and the accumulator 360, and one end of the cooling transfer unit 710, which will be described later. That is, the heat transfer unit 510 is interconnected with the cooling transfer unit 710 and shares a portion of the path for transferring the second heat exchange medium (B) to the chiller unit 130 with the cooling transfer unit 710. Accordingly, the heat transfer unit 510 can reduce the number of pipes for transmitting the second heat exchange medium (B) to the chiller unit 130 and simplify the structure of the chiller unit 130.

The heat recovery unit 520 branches off from the second circulation unit 310 connected between the compressor 320 and the evaporator 350, and uses the second heat exchange medium (B) discharged from the chiller unit 130 as a second circulation unit. Recover to unit 310. That is, the heat transfer unit 510 functions as a component that recovers the second heat exchange medium (B), which has completed heat exchange with the first heat exchange medium (A) in the chiller unit 130, to the second circulation unit 310.

The heating recovery unit 520 according to an embodiment of the present invention may be formed to have the shape of a pipe with one end in communication with the second circulation unit 310 connected between the evaporator 350 and the accumulator 360. Accordingly, the heat recovery unit 520 delivers the second heat exchange medium (B) discharged from the chiller unit 130 back to the compressor 320, and the temperature is reduced by the heat exchange action with the first heat exchange medium (A). The second heat exchange medium (B) can be induced to return to the high temperature and high pressure state. The other end of the heating recovery unit 520 communicates with the outlet of the second chiller passage 132 provided in the chiller unit 130.

The heating opening and closing unit 530 selectively opens and closes the heat transfer unit 510 and the heating recovery unit 520.

The heating switch 530 according to an embodiment of the present invention includes a heat transfer switch 531 and a heat recovery switch 532.

The heat transfer opening and closing unit 531 selectively opens and closes the heating transfer unit 510. The heat transfer opening/closing unit 531 is connected between one end of the heat transfer unit 510 and the second circulation unit 310 to adjust the communication state between the heat transfer unit 510 and the second circulation unit 310. In this case, the heat transfer opening/closing unit 531 can be exemplified as a 3-way valve capable of controlling the flow direction of the fluid for the three flow paths and controlling the flow direction of the second heat exchange medium (B) for the three flow paths. there is. The operation of the heat transfer opening/closing unit 531 is controlled by a control unit 900, which will be described later, and can open or close the heat transfer unit 510.

The heating recovery opening/closing unit 532 selectively opens and closes the heating recovery unit 520. The heating recovery opening/closing unit 532 is connected between one end of the heating recovery unit 520 and the second circulation unit 310 to adjust the communication state between the heating recovery unit 520 and the second circulation unit 310. In this case, the heating recovery opening/closing unit 532 may be exemplified as a 3-way valve capable of controlling the flow direction of fluid for three flow paths. The operation of the heating recovery opening/closing unit 532 is controlled by a control unit 900, which will be described later, and can open or close the heating recovery unit 520.

The cooling unit 700 is branched from the cycle unit 300 and exchanges heat with the low-temperature, low-pressure second heat exchange medium (B) discharged from the evaporator 350 with the first heat exchange medium (A) to form the battery module (10). It functions as a component that lowers the temperature.

The cooling unit 700 according to an embodiment of the present invention includes a cooling transmission unit 710, a cooling recovery unit 720, and a cooling opening/closing unit 730.

The cooling transfer unit 710 branches off from the second circulation unit 310 connected between the compressor 320 and the evaporator 350, and transfers the second heat exchange medium (B) discharged from the evaporator 350 to the chiller unit 130. ) is transmitted. That is, the cooling transfer unit 710 diverts the flow of the second heat exchange medium (B), which is discharged from the evaporator 350 and flows through the second circulation unit 310 at low temperature and low pressure, to the chiller unit 130. It functions as a composition. The cooling transfer unit 710 according to an embodiment of the present invention has one end in communication with the second circulation unit 310 connected between the evaporator 350 and the accumulator 360, and the other end with the second chiller passage 132. It may be formed to have the shape of a pipe communicating with the inlet.

One end of the cooling transfer unit 710 also communicates with the other end of the heating transfer unit 510. In this case, the cooling transfer unit 710 serves as a passage for transferring the second heat exchange medium (B) discharged from the evaporator 350 to the chiller unit 130 by the operation of the cooling transfer opening and closing unit 731, which will be described later. At the same time, it can also serve as a passage for delivering the second heat exchange medium (B) flowing along the heat transfer unit 510 to the chiller unit 130. Accordingly, the cooling transfer unit 710 can reduce the number of pipes for delivering the second heat exchange medium (B) to the chiller unit 130 and simplify the structure of the chiller unit 130.

The cooling recovery unit 720 branches off from the second circulation unit 310 connected between the compressor 320 and the evaporator 350, and transfers the second heat exchange medium (B) discharged from the chiller unit 130 into the second circulation unit. Recover to unit 310. That is, the heat transfer unit 510 functions as a component that recovers the second heat exchange medium (B), which has completed heat exchange with the first heat exchange medium (A) in the chiller unit 130, to the second circulation unit 310. The cooling recovery unit 720 according to an embodiment of the present invention may have the same configuration as the heating recovery unit 520. That is, the cooling recovery unit 720 and the heating recovery unit 520 may be formed to share the flow path of the second heat exchange medium (B). Accordingly, the cooling recovery unit 720 and the heating recovery unit 520 can reduce the number of pipes for recovering the second heat exchange medium (B) to the second circulation unit 310, and the chiller unit 130 The structure can be simplified. Alternatively, the cooling recovery unit 720 may be formed separately from the heating recovery unit 520.

The cooling opening/closing unit 730 selectively opens and closes the cooling transfer unit 710 and the cooling recovery unit 720.

The cooling opening and closing unit 730 according to an embodiment of the present invention includes a cooling transfer opening and closing unit 731 and a cooling recovery opening and closing unit 732.

The cooling transfer opening/closing unit 731 selectively opens and closes the cooling transfer unit 710. The cooling transfer opening/closing unit 731 is connected to the point where the second circulation unit 310, the other end of the heat transfer unit 510, and one end of the cooling transfer unit 710 intersect each other, thereby forming the second circulation unit 310 and heat transfer. The communication state between the unit 510 and the cooling transfer unit 710 is adjusted. In this case, the cooling transfer opening/closing unit 731 may be exemplified as a 4-way valve capable of controlling the flow direction of fluid for four flow paths. The operation of the cooling transfer opening/closing unit 731 may be controlled by a control unit 900, which will be described later.

The cooling recovery opening/closing unit 732 selectively opens and closes the cooling recovery unit 720. The cooling recovery opening/closing unit 732 may have the same configuration as the heating recovery opening/closing unit 532, as the cooling recovery unit 720 and the heating recovery unit 520 are illustrated as having the same configuration.

The sensing unit 800 detects the temperature of the battery module 10. The sensing unit 800 according to an embodiment of the present invention may be installed on the battery module 10 side and may be exemplified by various types of temperature sensors capable of detecting the temperature of the battery module 10.

The control unit 900 determines the thermal management mode based on the temperature change of the battery module 10 measured by the sensing unit 800, and operates the heating unit 500 and cooling unit 700 according to the determined thermal management mode. Control. The control unit 900 according to an embodiment of the present invention is an electronic control unit (ECU: Electronic Control Unit), a central processing unit, which is electrically connected to the heating switch 530 and the cooling switch 730 and controls their operations. It can be implemented as a (CPU: Central Processing Unit), processor, or SoC (System on Chip), and can control multiple hardware or software components by running an operating system or application, and can perform various data processing and calculations. can be performed. Additionally, the control unit 900 may be configured to execute at least one command stored in the memory and store execution result data in the memory.

Hereinafter, the operation process of the thermal management mode by the control unit according to an embodiment of the present invention will be described in detail.

Referring to FIG. 3, first, the sensing unit 800 detects the temperature of the battery module 10 (S100).

When the temperature of the battery module 10 detected by the sensing unit 800 is less than the first set temperature T1 (S200), the control unit 900 executes the heating mode (S210). Here, the first set temperature (T1) may be exemplified to be approximately 35°C.

Referring to FIG. 4, in the heating mode, the control unit 900 operates the heating unit 500 and stops the cooling unit 700 from operating.

More specifically, in the heating mode, the control unit 900 operates the heat transfer opening/closing unit 531 and the heating recovery opening/closing unit 532 to open both ends of the heat transfer unit 510 and the heating recovery unit 520, and heat transfer. One end of the unit 510 and the heating recovery unit 520 is communicated with the second circulation unit 310.

Meanwhile, as the heat transfer unit 510 and the cooling transfer unit 710 are connected to each other, the control unit 900 operates the cooling transfer opening and closing unit 731 to connect the other end of the heating transfer unit 510 and the cooling transfer unit 710. ) is connected to one end.

Thereafter, the high-temperature second heat exchange medium (B) discharged from the compressor 320 sequentially passes through the heating transfer unit 510 and the cooling transfer unit 710 and passes through the inlet of the second chiller passage 132 to the chiller unit ( 130) is transmitted inside. In this case, the temperature of the second heat exchange medium (B) delivered to the chiller unit 130 may be about 60°C to 70°C.

The high-temperature second heat exchange medium (B) delivered to the chiller unit 130 exchanges heat with the first heat exchange medium (A) flowing along the first chiller passage 131 inside the chiller unit 130, and performs the first heat exchange process. Raise the temperature of medium (A). In this case, the temperature of the first heat exchange medium (A) may be increased to approximately 30°C to 35°C by heat exchange with the second heat exchange medium (B).

The first heat exchange medium (A), whose temperature is raised and discharged from the chiller unit 130, flows into the interior of the heat management member 120 through the inlet side of the heat management passage 121, exchanges heat with the battery module 10, and exchanges heat with the battery module 10. Raise the temperature of the module 10.

At the same time, the control unit 900 operates the cooling transfer opening/closing unit 731 to block communication between the cooling transfer unit 710 and the second circulation unit 310 connected between the evaporator 350 and the accumulator 360. The low-temperature second heat exchange medium (B) discharged from the evaporator 350 is blocked from flowing into the chiller unit 130. Accordingly, in the heating mode, the temperature of the first heat exchange medium (A) can be determined only by the high temperature of the second heat exchange medium (B) delivered through the heating unit 500.

On the other hand, when the heating recovery unit 520, the cooling recovery unit 720, the heating recovery opening/closing unit 532, and the cooling recovery opening/closing unit 732 have the same configuration, the cooling recovery unit 720 may be maintained in an open state. You can.

Thereafter, when the temperature of the battery module 10 detected by the sensing unit 800 is above the first set temperature (T1) but below the second set temperature (T2) (S300), the control unit 900 executes the full charge mode. Do it (S310). Here, the second set temperature (T2) may be exemplified as 36°C.

In the second buffer mode, the control unit 900 stops the operation of the heating unit 500.

More specifically, the control unit 900 operates the heat transfer opening/closing unit 531 and the heating recovery opening/closing unit 532 to close the heat transfer unit 510 and the heating recovery unit 520.

At the same time, the control unit 900 operates the cooling transfer opening/closing unit 731 to block communication between the heating transfer unit 510 and the cooling transfer unit 710.

That is, the buffer mode functions as a mode that provides a certain interval to the temperature for the thermal management mode by the control unit 900 to be switched between the heating mode and the cooling mode described later.

Accordingly, the control unit 900 operates the heating unit 500 and the cooling unit 700 simultaneously in the process of switching between the heating mode and the cooling mode, and prevents the temperature of the battery module 10 from changing in an unintended direction. It is possible to prevent the heating unit 500 and the cooling unit 700 from repeatedly operating or stopping based on a single temperature, thereby reducing the durability of the components or unnecessary consumption of energy.

Thereafter, when the temperature of the battery module 10 detected by the sensing unit 800 is higher than the second set temperature (T2) (S400), the control unit 900 executes the cooling mode (S410).

Referring to FIG. 5, in the cooling mode, the control unit 900 operates the cooling unit 700 and stops the heating unit 500 from operating.

More specifically, in the cooling mode, the control unit 900 operates the cooling transfer opening and closing unit 731 and the cooling recovery opening and closing unit 732 to connect the cooling transfer unit 710 and the cooling recovery unit 720 to the second circulation unit 310. communicate with

Meanwhile, as the heat transfer unit 510 and the cooling transfer unit 710 are connected to each other, the control unit 900 operates the cooling transfer opening and closing unit 731 to connect the other end of the heating transfer unit 510 and the cooling transfer unit 710. ) blocks one set of communication channels.

Thereafter, the low-temperature second heat exchange medium (B) discharged from the evaporator 350 sequentially passes through the second circulation unit 310 and the cooling transfer unit 710 and passes through the inlet of the second chiller passage 132 to the chiller unit. It is delivered to the interior of (130). In this case, the temperature of the second heat exchange medium (B) delivered to the chiller unit 130 may be about 7°C to 10°C.

The low-temperature second heat exchange medium (B) delivered to the chiller unit 130 exchanges heat with the first heat exchange medium (A) flowing along the first chiller passage 131 inside the chiller unit 130, and performs the first heat exchange process. The temperature of medium (A) is lowered. In this case, the temperature of the first heat exchange medium (A) may be lowered to approximately 36° C. or lower due to heat exchange with the second heat exchange medium (B).

The first heat exchange medium (A), whose temperature is lowered and discharged from the chiller unit 130, flows into the interior of the heat management member 120 through the inlet side of the heat management passage 121, exchanges heat with the battery module 10, and exchanges heat with the battery module 10. The temperature of the module 10 is lowered.

The control unit 900 operates the cooling transfer opening/closing unit 731 to block communication between the second circulation unit 310 and the heat transfer unit 510 connected between the evaporator 350 and the accumulator 360. Accordingly, in the cooling mode, the temperature of the first heat exchange medium (A) can be determined only by the low temperature second heat exchange medium (B) delivered through the cooling unit 700.

In addition, the control unit 900 operates the cooling transfer opening/closing unit 731 to close the second circulation unit 310 connected between the cooling transfer opening/closing unit 731 and the cooling recovery opening/closing unit 732, thereby discharging discharge from the evaporator 350. It is possible to prevent the low temperature second heat exchange medium (B) from flowing into the chiller unit 130 and being directly transferred to the compressor 320.

On the other hand, when the heating recovery unit 520, the cooling recovery unit 720, the heating recovery opening/closing unit 532, and the cooling recovery opening/closing unit 732 have the same configuration, the heating recovery unit 520 may be maintained in an open state. You can.

The present invention has been described with reference to the embodiments shown in the drawings, but these are merely exemplary, and those skilled in the art will recognize that various modifications and other equivalent embodiments are possible therefrom. You will understand.

Therefore, the scope of technical protection of the present invention should be determined by the scope of the patent claims below.

Claims

A heat management unit in which the first heat exchange medium circulates and exchanges heat with the battery module;

A cycle unit including a compressor, condenser, expansion valve, and evaporator through which a second heat exchange medium is circulated;

a heating unit branched from the cycle unit and heat-exchanging the second heat exchange medium with the first heat exchange medium to increase the temperature of the battery module; and

A cooling unit branched from the cycle unit and heat-exchanging the second heat exchange medium with the first heat exchange medium to lower the temperature of the battery module.
According to clause 1,

The thermal management unit is,

a first circulation section through which the first heat exchange medium circulates;

a heat management member connected to the first circulation unit and heat-exchanging the first heat exchange medium with the battery module;

A battery thermal management system for an electric vehicle, comprising: a chiller unit connected to the first circulation unit and heat-exchanging the first heat exchange medium with the second heat exchange medium.
According to clause 2,

The heating unit is,

a heat transfer unit branched between the compressor and the condenser and transferring the second heat exchange medium discharged from the compressor to the chiller unit;

a heat recovery unit branched between the compressor and the evaporator and transferring the second heat exchange medium discharged from the chiller unit to the compressor; and

A heat management system for a battery for an electric vehicle, comprising: a heating opening and closing unit that selectively opens and closes the heat transfer unit and the heating recovery unit.
According to clause 3,

The cooling unit is,

a cooling transfer unit branched between the compressor and the evaporator and delivering the second heat exchange medium discharged from the evaporator to the chiller unit;

a cooling recovery unit branched between the compressor and the evaporator and transferring the second heat exchange medium discharged from the chiller unit to the compressor; and

A battery thermal management system for an electric vehicle, comprising a cooling opening and closing unit that selectively opens and closes the cooling transfer unit and the cooling recovery unit.
According to clause 4,

A battery thermal management system for an electric vehicle, characterized in that the heat transfer unit and the cooling transfer unit are interconnected.
According to clause 4,

A battery thermal management system for an electric vehicle, wherein the heating recovery unit and the cooling recovery unit are the same.
According to clause 1,

A sensing unit that detects the temperature of the battery module; and

A control unit that determines a thermal management mode based on the temperature change of the battery module measured by the sensing unit and controls the operation of the heating unit and the cooling unit according to the determined thermal management mode. Automotive battery thermal management system.
According to clause 7,

The control unit, when the temperature of the battery module detected by the sensing unit is below the first set temperature, executes a heating mode to operate the heating unit and stop the operation of the cooling unit. Battery thermal management system.
According to clause 8,

The control unit, when the temperature of the battery module detected by the sensing unit is higher than the second set temperature, executes a cooling mode to operate the cooling unit and stop the operation of the heating unit. Battery thermal management system.
According to clause 9,

The control unit executes a buffer mode that stops both the heating unit and the cooling unit when the temperature of the battery module detected by the sensing unit is greater than the first set temperature and less than the second set temperature. A battery thermal management system for electric vehicles, characterized in that.