CN111769299B - Battery thermal management system with dehumidification function and dehumidification method thereof - Google Patents

Battery thermal management system with dehumidification function and dehumidification method thereof Download PDF

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Publication number
CN111769299B
CN111769299B CN201910257664.9A CN201910257664A CN111769299B CN 111769299 B CN111769299 B CN 111769299B CN 201910257664 A CN201910257664 A CN 201910257664A CN 111769299 B CN111769299 B CN 111769299B
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China
Prior art keywords
heat exchanger
thermal management
air
energy storage
dehumidified
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CN201910257664.9A
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CN111769299A (en
Inventor
何贤
钱程
苏健
胡静
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Dun An Automobile Thermal Management Technology Co ltd
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Dun An Automobile Thermal Management Technology Co ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M6/00Primary cells; Manufacture thereof
    • H01M6/50Methods or arrangements for servicing or maintenance, e.g. maintaining operating temperature
    • H01M6/5038Heating or cooling of cells or batteries
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B13/00Compression machines, plant or systems with reversible cycle
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/615Heating or keeping warm
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • H01M10/6556Solid parts with flow channel passages or pipes for heat exchange
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561Gases
    • H01M10/6563Gases with forced flow, e.g. by blowers
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567Liquids
    • H01M10/6568Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/657Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571Resistive heaters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25BREFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT-PUMP SYSTEMS
    • F25B2313/00Compression machines, plant, or systems with reversible cycle not otherwise provided for
    • F25B2313/027Compression machines, plant, or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741Compression machines, plant, or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The invention provides a battery thermal management system with a dehumidification function and a dehumidification method. The heat management system is used for cooling, heating or dehumidifying an energy storage battery and comprises a compressor, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger and an air driving unit, wherein in a first state, the air driving unit is used for driving air to be dehumidified to sequentially pass through the third heat exchanger and the fourth heat exchanger, and in a second state, the air driving unit is used for driving the air to be dehumidified to sequentially pass through the fourth heat exchanger and the third heat exchanger. The heat management system integrates the triple functions of cooling, heating and dehumidifying, realizes cooling, heating and dehumidifying treatment on the energy storage battery by using one set of system, reduces the number of parts, reduces the cost of the whole set of system, increases the energy utilization efficiency, and can effectively reduce the occupied area of equipment. Meanwhile, the energy storage battery thermal management system has higher thermal management efficiency.

Description

Battery thermal management system with dehumidification function and dehumidification method thereof
Technical Field
The invention relates to the field of thermal management of energy storage batteries, in particular to a battery thermal management system with a dehumidification function and a dehumidification method.
Background
The energy storage battery has high density and concentrated heat generation, and if the generated heat can not be discharged in time, the service life of the energy storage battery can be reduced, thermal runaway can occur and even explosion can occur. In a low temperature environment, if the energy storage battery is not heated, phenomena such as difficult discharge and capacity fading occur. The environment humidity of the energy storage battery is too high, which also easily causes corrosion and even failure of electrical components. Therefore, the thermal management system of the energy storage battery needs to include three functions of cooling, heating and dehumidifying.
The existing energy storage battery usually adopts one set of heat pump system to cool and heat the air of the container where the energy storage battery is located, and adopts the other set of cooling system to dehumidify the air of the container where the energy storage battery is located. However, the air flows to exchange heat with the energy storage battery pack, so that the cooling and heating rates are slow, and the heat exchange performance is poor; and two sets of systems are adopted, so that more parts are used, the price is high, the occupied area is large, and the dehumidification economical efficiency of the dehumidification system in winter is poor.
Disclosure of Invention
The invention mainly aims to provide a battery thermal management system with a dehumidification function and a dehumidification method, and aims to solve the problems that in the prior art, the thermal management efficiency of an energy storage battery is low, and when a heat pump system and a dehumidification system are respectively adopted, two sets of equipment parts are complex and the occupied area is large.
In order to achieve the above object, according to one aspect of the present invention, there is provided a battery thermal management system with a dehumidification function for performing cooling, heating or dehumidification treatment on an energy storage battery, wherein the energy storage battery thermal management system with the dehumidification function includes: a compressor having a refrigerant inlet and a refrigerant outlet; a first heat exchanger having a first flow port, a second flow port, a third flow port, and a fourth flow port; a second heat exchanger having a fifth flow port and a sixth flow port; the second circulation port is connected with the sixth circulation port, and the refrigerant outlet has a first state and a second state which can be switched; wherein, in the first state, the refrigerant outlet is connected with the first circulation port, and the fifth circulation port is connected with the refrigerant inlet; in the second state, the refrigerant outlet is connected with the fifth circulation port, and the first circulation port is connected with the refrigerant inlet; the cooling tower is provided with a cooling water inlet and a cooling water outlet, the cooling water inlet is connected with the third circulation port, and the cooling water outlet is connected with the fourth circulation port; the third heat exchanger is connected with the second heat exchanger in parallel and arranged between the second circulation port and the compressor; the fourth heat exchanger is connected with the cooling tower in parallel and is arranged between the cooling water inlet and the cooling water outlet; and the air driving unit is used for driving the air to be dehumidified to sequentially pass through the third heat exchanger and the fourth heat exchanger in the first state, and is used for driving the air to be dehumidified to sequentially pass through the fourth heat exchanger and the third heat exchanger in the second state.
Further, the air driving unit is a forward and reverse rotating fan.
Further, second circulation mouth and sixth circulation mouth link to each other through first pipeline, and second circulation mouth and third heat exchanger link to each other through the second pipeline, and the energy storage battery thermal management system who takes dehumidification function still includes: the first throttling valve is arranged on the first pipeline; and the second throttle valve is arranged on the second pipeline.
Further, the first throttle valve and the second throttle valve are both electronic expansion valves.
Furthermore, the energy storage battery thermal management system with the dehumidification function further comprises a control system, and the control system is used for respectively controlling the opening and closing states of the first throttle valve and the second throttle valve.
Furthermore, the energy storage battery thermal management system with the dehumidification function further comprises a four-way reversing valve, four ports of the four-way reversing valve are respectively connected with the refrigerant inlet, the refrigerant outlet, the first circulation port and the fifth circulation port, and the four-way reversing valve is used for switching the first state and the second state.
Furthermore, the four-way reversing valve is connected with the fifth circulation port through a third pipeline, and the third heat exchanger is connected with the third pipeline through a fourth pipeline.
Further, the first heat exchanger and the second heat exchanger are both plate heat exchangers.
Further, the cooling water outlet is connected with the fourth circulation port through a fifth pipeline, and the energy storage battery thermal management system with the dehumidification function further comprises: and the first pump body is arranged on the fifth pipeline.
Further, an outlet of the fourth heat exchanger is connected with the fifth pipeline through a sixth pipeline, and a connection position of the sixth pipeline and the fifth pipeline is located at the upstream of the first pump body.
Further, the energy storage battery thermal management system with the dehumidification function further comprises: the first water valve is arranged on the fifth pipeline; the second water valve is arranged on a pipeline connected with the cooling water inlet and the third circulating port; and the third water valve is arranged on a pipeline connected with the fourth heat exchanger and the third circulating port.
Furthermore, the battery pack of the energy storage battery is provided with a battery pack water inlet and a battery pack water outlet, the second heat exchanger is further provided with a seventh circulation port and an eighth circulation port, the battery pack water inlet is connected with the seventh circulation port, and the battery pack water outlet is connected with the eighth circulation port.
Further, the battery package outlet is continuous through the seventh pipeline with eighth circulation mouth, and the energy storage battery thermal management system of area dehumidification function still includes: and the second pump body is arranged on the seventh pipeline.
Further, the battery package water inlet links to each other through the eighth pipeline with seventh circulation mouth, and the energy storage battery thermal management system of area dehumidification function still includes: and the PTC water heater is arranged on the eighth pipeline.
According to another aspect of the invention, a battery thermal management and dehumidification method is also provided, which is to use the above-mentioned thermal management system with dehumidification function to cool, heat and dehumidify the energy storage battery.
Further, the refrigerant outlet is switched to a first state to perform cooling treatment on the energy storage battery, or the refrigerant outlet is switched to a second state to perform heating treatment on the energy storage battery.
Further, the first throttle valve and the second throttle valve are opened, in the process of cooling treatment, the air driving unit is used for driving air to be dehumidified in the energy storage battery to sequentially pass through the third heat exchanger and the fourth heat exchanger, the third heat exchanger is used for dehumidifying the air to be dehumidified, and the fourth heat exchanger is used for returning the temperature of the dehumidified air.
Furthermore, the first throttle valve and the second throttle valve are opened, in the process of heating treatment, the air driving unit is used for driving air to be dehumidified in the energy storage battery to sequentially pass through the fourth heat exchanger and the third heat exchanger, the fourth heat exchanger is used for dehumidifying the air to be dehumidified, and the third heat exchanger is used for returning the temperature of the dehumidified air.
Further, the first throttle valve is closed, the second throttle valve is opened, the refrigerant outlet is switched to the first state, the air driving unit is used for driving air to be dehumidified in the energy storage battery to sequentially pass through the third heat exchanger and the fourth heat exchanger, the third heat exchanger is used for dehumidifying the air to be dehumidified, and the fourth heat exchanger is used for returning the temperature of the dehumidified air.
Further, the first throttle valve is closed, the second throttle valve is opened, the refrigerant outlet is switched to the second state, the air driving unit is used for driving air to be dehumidified in the energy storage battery to sequentially pass through the fourth heat exchanger and the third heat exchanger, the fourth heat exchanger is used for dehumidifying the air to be dehumidified, and the third heat exchanger is used for returning the temperature of the dehumidified air.
The battery thermal management system with the dehumidification function provided by the invention integrates the triple functions of cooling, heating and dehumidification, realizes the cooling, heating and dehumidification treatment of the energy storage battery by using one set of system, reduces the number of parts, reduces the cost of the whole set of system, increases the energy utilization efficiency, and can effectively reduce the floor area of equipment. Meanwhile, the energy storage battery thermal management system utilizes the refrigerant to perform high-efficiency heat exchange with the battery water of the energy storage battery, so that the heat exchange efficiency is higher.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic structural diagram of an energy storage battery thermal management system with a dehumidification function in an embodiment of the invention.
Wherein the figures include the following reference numerals:
10. a compressor; 101. a refrigerant inlet; 102. a refrigerant outlet; 20. a first heat exchanger; 201. a first circulation port; 202. a second flow port; 203. a third flow port; 204. a fourth flow port; 21. a first throttle valve; 22. a second throttle valve; 30. a second heat exchanger; 301. a fifth circulation port; 302. a sixth circulation port; 303. a seventh circulation port; 304. an eighth circulation port; 40. a cooling tower; 41. a first pump body; 42. a first water valve; 43. a second water valve; 44. a third water valve; 401. a cooling water inlet; 402. a cooling water outlet; 50. a third heat exchanger; 60. a fourth heat exchanger; 70. an air driving unit; 80. a four-way reversing valve; 90. a battery pack; 91. a second pump body; 92. PTC water heater.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As described in the background section, the thermal management efficiency of the energy storage battery in the prior art is low, and when the heat pump system and the dehumidification system are respectively adopted, two sets of equipment parts are complex and occupy a large area.
In order to solve the above problems, the present invention provides a battery thermal management system with a dehumidification function, which is used for cooling, heating or dehumidifying an energy storage battery, as shown in fig. 1, the battery thermal management system with a dehumidification function includes a compressor 10, a first heat exchanger 20, a second heat exchanger 30, a cooling tower 40, a third heat exchanger 50, a fourth heat exchanger 60 and an air driving unit 70; the compressor 10 has a refrigerant inlet 101 and a refrigerant outlet 102; the first heat exchanger 20 has a first port 201, a second port 202, a third port 203, and a fourth port 204; the second heat exchanger 30 has a fifth circulation port 301 and a sixth circulation port 302; wherein the second circulation port 202 and the sixth circulation port 302 are connected, and the refrigerant outlet 102 has a first state and a second state which are switchable; wherein, in the first state, the refrigerant outlet 102 is connected to the first circulation port 201, and the fifth circulation port 301 is connected to the refrigerant inlet 101; in the second state, the refrigerant outlet 102 is connected to the fifth circulation port 301, and the first circulation port 201 is connected to the refrigerant inlet 101; the cooling tower 40 has a cooling water inlet 401 and a cooling water outlet 402, the cooling water inlet 401 is connected to the third circulation port 203, and the cooling water outlet 402 is connected to the fourth circulation port 204; the third heat exchanger 50 is arranged in parallel with the second heat exchanger 30 between the second circulation port 202 and the compressor 10; the fourth heat exchanger 60 is arranged between the cooling water inlet 401 and the cooling water outlet 402 in parallel with the cooling tower 40; in the first state, the air driving unit 70 is configured to drive the air to be dehumidified to sequentially pass through the third heat exchanger 50 and the fourth heat exchanger 60, and in the second state, the air driving unit 70 is configured to drive the air to be dehumidified to sequentially pass through the fourth heat exchanger 60 and the third heat exchanger 50.
The battery thermal management system with the dehumidification function provided by the invention integrates the triple functions of cooling, heating and dehumidification, realizes the cooling, heating and dehumidification treatment of the energy storage battery by using one set of system, reduces the number of parts, reduces the cost of the whole set of system, increases the energy utilization efficiency, and can effectively reduce the floor area of equipment. Meanwhile, the energy storage battery thermal management system utilizes the refrigerant to perform high-efficiency heat exchange with the battery water of the energy storage battery, so that the heat exchange efficiency is higher.
The operation states of the components in the cooling, heating and dehumidifying processes are specifically analyzed as follows:
cooling process and dehumidification process: the refrigerant outlet 102 is switched to the first state, at this time, the refrigerant is compressed to a high-temperature high-pressure gaseous state by the compressor 10, enters the first heat exchanger 20 through the first circulation port 201, exchanges heat with the cooling water from the cooling tower 40, and the high-temperature high-pressure gaseous refrigerant releases heat and then is converted into a low-temperature condensed liquid state. Then, the low-temperature liquid refrigerant enters the second heat exchanger 30 through the second circulation port 202 and the sixth circulation port 302, and exchanges heat with water from the battery pack of the energy storage battery, so that the energy storage battery is cooled. The refrigerant absorbs heat again by heat exchange, and then exits from the fifth flow port 301 to return to the compressor. Meanwhile, since the third heat exchanger 50 and the second heat exchanger 30 are disposed in parallel between the second circulation port 202 and the compressor 10, a part of the low-temperature liquid refrigerant flowing out through the second circulation port 202 enters the third heat exchanger 50, and the third heat exchanger 50 at this time is equivalent to a dehumidification evaporator. Under the driving action of the air driving unit 70, the dehumidified air in the energy storage battery container contacts with the third heat exchanger 50, and the carried moisture is condensed and separated out under the heat absorption action of the refrigerant, so that the dehumidification effect is achieved. Then, the dehumidified air continues to contact with the fourth heat exchanger 60, and since the cooling water absorbs heat of the high-temperature and high-pressure gaseous refrigerant in the first heat exchanger 20, the cooling water after absorbing heat enters the fourth heat exchanger 60 to be converted into an air heater, and the dehumidified air returns to the temperature under the action of the cooling water. The processes are carried out circularly, and the cooling and dehumidifying treatment of the energy storage battery can be realized simultaneously.
A heating process and a dehumidifying process: the refrigerant outlet 102 is switched to the second state, at this time, the refrigerant is compressed to a high-temperature high-pressure gaseous state by the compressor 10, enters the second heat exchanger 30 through the fifth circulation port 301, and exchanges heat with water from the battery pack of the energy storage battery, so that the heating of the energy storage battery is completed. After releasing the heat, the refrigerant is converted into low-temperature condensate, and then enters the first heat exchanger 20 through the sixth circulation port 302 and the second circulation port 202 to exchange heat with the cooling water from the cooling tower 40, so that the temperature of the cooling water is further lowered, and the refrigerant in a low-temperature condensate liquid state absorbs heat and then comes out from the first circulation port 201 to return to the compressor. Meanwhile, since the third heat exchanger 50 and the second heat exchanger 30 are disposed in parallel between the second circulation port 202 and the compressor 10, a part of the high-temperature high-pressure gaseous refrigerant from the compressor 10 enters the third heat exchanger 50, and in this case, the third heat exchanger 50 corresponds to an air heater. And a part of the lower temperature cooling water coming out of the third flow port 203 of the first heat exchanger 20 enters the fourth heat exchanger 60 disposed in parallel with the cooling tower 40. In this case, the fourth heat exchanger 60 may also function as a dehumidifying evaporator. Under the driving action of the air driving unit 70, the dehumidified air in the energy storage battery container exchanges heat with the fourth heat exchanger 60, and the carried moisture is condensed and separated out under the action of the low-temperature cooling water, so that the dehumidification effect is achieved. The dehumidified air then continues to contact the third heat exchanger 50, returning to temperature under the heat release from its refrigerant. The processes are carried out circularly, and heating and dehumidifying treatment on the energy storage battery can be simultaneously realized.
It should be noted that, by arranging the third heat exchanger 50 and the fourth heat exchanger 60 in parallel, the cold or heat in the refrigerant and the cooling water can be more fully utilized, and the dehumidification process is more efficient.
In a preferred embodiment, the compressor 10 is a turbo compressor.
In the gist of the present invention, by switching between the first state and the second state, dehumidification of air in the energy storage battery container can be achieved simultaneously with the cooling or heating process. In order to further save equipment and space, in a preferred embodiment, the air driving unit 70 is a counter-rotating fan. The flow direction of the dehumidified air can be conveniently controlled by adopting a forward and reverse rotating fan, for example, the dehumidified air is driven to rotate forward in the cooling process, and then passes through the third heat exchanger 50 and the fourth heat exchanger 60; during heating, it is reversed, driving the dehumidified air through the fourth heat exchanger 60 before the third heat exchanger 50. In order to increase the speed of air dehumidification and air return, the forward/reverse rotation fan, the third heat exchanger 50, and the fourth heat exchanger 60 are preferably disposed in order and in opposition to each other.
In a preferred embodiment, as shown in fig. 1, the second circulation port 202 and the sixth circulation port 302 are connected through a first pipeline, the second circulation port 202 and the third heat exchanger 50 are connected through a second pipeline, and the energy storage battery thermal management system with the dehumidification function further comprises a first throttle valve 21 and a second throttle valve 22, wherein the first throttle valve 21 is arranged on the first pipeline; a second throttle 22 is arranged on the second line. In this way, during actual operation, the refrigerant can be further converted into a low-temperature condensation state through the first throttle valve 21 and the second throttle valve 22, so that the cooling efficiency of the energy storage battery is further improved. Meanwhile, by adjusting the opening and closing states of the first throttle valve 21 and the second throttle valve 22, separate cooling process, heating process, and dehumidifying process may also be implemented. Such as. When the dehumidification process is not required, the second throttle 22 may be closed, the first throttle 21 may be opened, and then cooling or heating of the energy storage battery may be achieved by switching between the first state and the second state, respectively. When cooling or heating is not required, the first throttle valve 21 may be closed and the second throttle valve may be opened to perform a separate dehumidification process in the first state or the second state.
Preferably, the first throttle 21 and the second throttle 22 are both electronic expansion valves.
In order to switch the opening and closing states of the first throttle valve 21 and the second throttle valve 22 more conveniently and intelligently, in a preferred embodiment, the energy storage battery thermal management system with the dehumidification function further comprises a control system, and the control system is used for controlling the opening and closing states of the first throttle valve 21 and the second throttle valve 22 respectively. More preferably, the control system is also electrically connected to other valve bodies to automatically control the respective valve bodies.
The switching between the first state and the second state can be accomplished by a person skilled in the art by means of a valve connection within the spirit of the invention. In order to simplify the equipment and save the occupied area, in a preferred embodiment, as shown in fig. 1, the energy storage battery thermal management system with dehumidification function further includes a four-way reversing valve 80, four ports of the four-way reversing valve 80 are respectively connected to the refrigerant inlet 101, the refrigerant outlet 102, the first flow port 201 and the fifth flow port 301, and the four-way reversing valve 80 is used for switching the first state and the second state. Thus, the communication state between the four ports can be switched easily by the reversing adjustment in the four-way reversing valve 80, thereby switching the first state (cooling state) and the second state (heating state) more easily.
In a preferred embodiment, the four-way reversing valve 80 is connected to the fifth port 301 via a third line, and the third heat exchanger 50 is connected to the third line via a fourth line. In this way, the direction of the refrigerant flow in the fifth port 301 and the refrigerant flow in the third heat exchanger 50 can be switched simultaneously by switching the direction of the four-way selector valve 80, which is more convenient to operate.
In a preferred embodiment, the first heat exchanger 20 and the second heat exchanger 30 are both plate heat exchangers. The plate heat exchanger has higher heat exchange efficiency, and the plate heat exchanger is favorable for further improving the cooling or heating efficiency of the energy storage battery.
In a preferred embodiment, as shown in fig. 1, the cooling water outlet 402 is connected to the fourth communication port 204 through a fifth pipeline, and the energy storage battery thermal management system with dehumidification function further includes a first pump body 41, and the first pump body 41 is disposed on the fifth pipeline. The first pump body 41 can drive the cooling water to flow, so as to provide power for the heat exchange of the first heat exchanger 20. More preferably, the outlet of the fourth heat exchanger 60 is connected to the fifth pipeline through a sixth pipeline, and the connection of the sixth pipeline to the fifth pipeline is located upstream of the first pump body 41.
In order to more conveniently control the flow direction of the cooling water, in a preferred embodiment, as shown in fig. 1, the energy storage battery thermal management system with the dehumidification function further includes:
a first water valve 42 disposed on the fifth pipeline;
a second water valve 43 provided on a pipe connecting the cooling water inlet 401 and the third circulation port 203;
and a third water valve 44 disposed on a line connecting the fourth heat exchanger 60 and the third flow port 203.
With the thermal management system according to the present invention, the battery pack of the energy storage battery is connected in series between the seventh circulation port 303 and the eighth circulation port 304, and the cooling or heating process can be performed by circulating the battery pack water. Preferably, as shown in fig. 1, the battery pack 90 of the energy storage battery has a battery pack water inlet and a battery pack water outlet, and the second heat exchanger 30 further has a seventh flow port 303 and an eighth flow port 304, the battery pack water inlet being connected to the seventh flow port 303, and the battery pack water outlet being connected to the eighth flow port 304.
In order to provide power to the water in the battery pack, in a preferred embodiment, the battery pack water outlet is connected with the eighth flow port 304 through a seventh pipeline, and the energy storage battery thermal management system with the dehumidification function further comprises a second pump body 91, wherein the second pump body 91 is arranged on the seventh pipeline.
In a preferred embodiment, the water inlet of the battery pack is connected with the seventh flow port 303 through an eighth pipeline, and the energy storage battery thermal management system with the dehumidification function further comprises a PTC water heater 92, wherein the PTC water heater 92 is arranged on the eighth pipeline. The PTC water heater 92 can be used as a backup heating device to heat the battery pack in the event of a failure in other heating processes.
According to another aspect of the invention, a battery thermal management and dehumidification method is further provided, wherein the energy storage battery thermal management system with the dehumidification function is used for cooling, heating and dehumidifying the energy storage battery. As described above, the thermal management system of the present invention can integrate cooling, heating, and dehumidifying functions, and use one set of system to implement cooling, heating, and dehumidifying processes on the energy storage battery, thereby reducing the number of components, reducing the cost of the whole set of system, increasing the energy utilization efficiency, and effectively reducing the floor area of the equipment. Meanwhile, the energy storage battery thermal management system utilizes the refrigerant and the battery water-in-package of the energy storage battery to carry out high-efficiency heat exchange, so that the system has higher heat pipe efficiency.
The following description is directed to the operation of the cooling, heating and dehumidifying processes:
in a preferred embodiment, the refrigerant outlet 102 is switched to a first state to perform a cooling process on the energy storage battery, or the refrigerant outlet 102 is switched to a second state to perform a heating process on the energy storage battery.
In a preferred embodiment, the first throttle valve 21 and the second throttle valve 22 are opened, and during the cooling process, the air to be dehumidified in the energy storage battery is driven by the air driving unit 70 to sequentially pass through the third heat exchanger 50 and the fourth heat exchanger 60, the air to be dehumidified is dehumidified by the third heat exchanger 50, and the dehumidified air is returned to the temperature by the fourth heat exchanger 60.
In a preferred embodiment, the first throttle valve 21 and the second throttle valve 22 are opened, the air to be dehumidified in the energy storage battery is driven by the air driving unit 70 to sequentially pass through the fourth heat exchanger 60 and the third heat exchanger 50 during the heating process, the air to be dehumidified is dehumidified by the fourth heat exchanger 60, and the dehumidified air is returned to the temperature by the third heat exchanger 50.
In a preferred embodiment, the first throttle valve 21 is closed, the second throttle valve 22 is opened, the refrigerant outlet 102 is switched to the first state, the air to be dehumidified in the energy storage battery is driven by the air driving unit 70 to pass through the third heat exchanger 50 and the fourth heat exchanger 60 in sequence, the air to be dehumidified is dehumidified by the third heat exchanger 50, and the dehumidified air is returned to the temperature by the fourth heat exchanger 60.
In a preferred embodiment, the first throttle valve 21 is closed, the second throttle valve 22 is opened, the refrigerant outlet 102 is switched to the second state, the air to be dehumidified in the energy storage battery is driven by the air driving unit 70 to pass through the fourth heat exchanger 60 and the third heat exchanger 50 in sequence, the air to be dehumidified is dehumidified by the fourth heat exchanger 60, and the dehumidified air is returned to the temperature by the third heat exchanger 50.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
the energy storage battery thermal management system with the dehumidification function provided by the invention integrates the triple functions of cooling, heating and dehumidification, realizes the cooling, heating and dehumidification treatment of the energy storage battery by using one set of system, reduces the number of parts, reduces the cost of the whole set of system, increases the energy utilization efficiency, and can effectively reduce the floor area of equipment. Meanwhile, the energy storage battery thermal management system utilizes the refrigerant to perform high-efficiency heat exchange with the battery water of the energy storage battery, so that the heat exchange efficiency is higher.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (20)

1. The utility model provides a take battery thermal management system of dehumidification function for cool off, heat or dehumidification processing to the energy storage battery, its characterized in that, the energy storage battery thermal management system of taking the dehumidification function includes:
a compressor (10) having a refrigerant inlet (101) and a refrigerant outlet (102);
a first heat exchanger (20) having a first flow port (201), a second flow port (202), a third flow port (203), and a fourth flow port (204);
a second heat exchanger (30) having a fifth circulation port (301) and a sixth circulation port (302); wherein the second communication port (202) and the sixth communication port (302) are connected, and the refrigerant outlet (102) has a first state and a second state which are switchable; wherein in the first state the refrigerant outlet (102) is connected to the first circulation port (201) and the fifth circulation port (301) is connected to the refrigerant inlet (101); in the second state, the refrigerant outlet (102) is connected to the fifth circulation port (301), and the first circulation port (201) is connected to the refrigerant inlet (101);
a cooling tower (40) having a cooling water inlet (401) and a cooling water outlet (402), the cooling water inlet (401) being connected to the third circulation port (203), the cooling water outlet (402) being connected to the fourth circulation port (204);
a third heat exchanger (50) arranged in parallel with the second heat exchanger (30) between the second flow port (202) and the compressor (10);
a fourth heat exchanger (60) disposed in parallel with the cooling tower (40) between the cooling water inlet (401) and the cooling water outlet (402);
an air driving unit (70), in the first state, the air driving unit (70) is used for driving the air to be dehumidified to sequentially pass through the third heat exchanger (50) and the fourth heat exchanger (60), and in the second state, the air driving unit (70) is used for driving the air to be dehumidified to sequentially pass through the fourth heat exchanger (60) and the third heat exchanger (50).
2. The battery thermal management system with dehumidification function of claim 1, wherein said air driving unit (70) is a counter-rotating fan.
3. The dehumidification-capable battery thermal management system of claim 1, wherein the second flow port (202) and the sixth flow port (302) are connected by a first line, wherein the second flow port (202) and the third heat exchanger (50) are connected by a second line, and wherein the dehumidification-capable energy storage battery thermal management system further comprises:
a first throttle valve (21) provided on the first pipe;
a second throttle valve (22) disposed on the second line.
4. The battery thermal management system with dehumidification function of claim 3, wherein the first throttle (21) and the second throttle (22) are both electronic expansion valves.
5. The dehumidification-capable battery thermal management system of claim 4, further comprising a control system configured to control the open and close states of the first throttle (21) and the second throttle (22), respectively.
6. The dehumidification-capable battery thermal management system according to any one of claims 1 to 5, further comprising a four-way reversing valve (80), wherein four ports of the four-way reversing valve (80) are respectively connected to the refrigerant inlet (101), the refrigerant outlet (102), the first flow port (201), and the fifth flow port (301), and the four-way reversing valve (80) is configured to switch between the first state and the second state.
7. The battery thermal management system with dehumidification function of claim 6, wherein the four-way reversing valve (80) is connected to the fifth flow port (301) through a third pipeline, and the third heat exchanger (50) is connected to the third pipeline through a fourth pipeline.
8. The battery thermal management system with dehumidification function according to any of claims 1 to 5, wherein the first heat exchanger (20) and the second heat exchanger (30) are both plate heat exchangers.
9. The dehumidifying-enabled battery thermal management system according to any one of claims 1-5, wherein the cooling water outlet (402) and the fourth flow port (204) are connected by a fifth pipeline, and the dehumidifying-enabled energy storage battery thermal management system further comprises:
a first pump body (41) provided on the fifth pipe.
10. The battery thermal management system with dehumidification function according to claim 9, wherein the outlet of said fourth heat exchanger (60) is connected to said fifth pipe by a sixth pipe, and the connection of said sixth pipe to said fifth pipe is located upstream of said first pump body (41).
11. The dehumidified energy storage battery thermal management system of claim 10, further comprising:
a first water valve (42) disposed on the fifth line;
a second water valve (43) provided on a pipe connecting the cooling water inlet (401) and the third flow port (203);
and the third water valve (44) is arranged on a pipeline connected with the fourth heat exchanger (60) and the third circulating port (203).
12. The battery thermal management system with dehumidification function according to any of claims 1 to 5, wherein the battery pack (90) of the energy storage battery has a battery pack water inlet and a battery pack water outlet, and wherein the second heat exchanger (30) further has a seventh flow port (303) and an eighth flow port (304), the battery pack water inlet being connected to the seventh flow port (303), and the battery pack water outlet being connected to the eighth flow port (304).
13. The dehumidified energy storage battery thermal management system of claim 12, wherein the battery pack outlet is connected to the eighth port (304) via a seventh conduit, and further comprising:
and a second pump body (91) provided on the seventh pipe.
14. The dehumidification-capable battery thermal management system of claim 13, wherein the battery pack water inlet is connected to the seventh port (303) via an eighth line, and wherein the dehumidification-capable energy storage battery thermal management system further comprises:
a PTC water heater (92) disposed on the eighth line.
15. A battery thermal management and dehumidification method, characterized in that the energy storage battery thermal management system with dehumidification function of any one of claims 1 to 14 is used for cooling, heating and dehumidifying the energy storage battery.
16. The battery thermal management and dehumidification method according to claim 15, wherein a refrigerant outlet (102) is switched to a first state to cool the energy storage battery or the refrigerant outlet (102) is switched to a second state to heat the energy storage battery.
17. The battery thermal management and dehumidification method according to claim 16, wherein a first throttle valve (21) and a second throttle valve (22) are opened, air to be dehumidified in the energy storage battery is driven by an air driving unit (70) to sequentially pass through a third heat exchanger (50) and a fourth heat exchanger (60) during the cooling process, the air to be dehumidified is dehumidified by the third heat exchanger (50), and the dehumidified air is returned to the temperature by the fourth heat exchanger (60).
18. The battery heat management and dehumidification method according to claim 16, wherein a first throttle valve (21) and a second throttle valve (22) are opened, air to be dehumidified in the energy storage battery is driven by an air driving unit (70) to sequentially pass through a fourth heat exchanger (60) and a third heat exchanger (50) during the heating process, the air to be dehumidified is dehumidified by the fourth heat exchanger (60), and the dehumidified air is returned to the temperature by the third heat exchanger (50).
19. The battery thermal management and dehumidification method according to claim 15, wherein a first throttle valve (21) is closed, a second throttle valve (22) is opened, a refrigerant outlet (102) is switched to a first state, air to be dehumidified in the energy storage battery is driven by an air driving unit (70) to sequentially pass through a third heat exchanger (50) and a fourth heat exchanger (60), the air to be dehumidified is dehumidified by the third heat exchanger (50), and the dehumidified air is returned to the temperature by the fourth heat exchanger (60).
20. The battery thermal management and dehumidification method according to claim 15, wherein a first throttle valve (21) is closed, a second throttle valve (22) is opened, a refrigerant outlet (102) is switched to a second state, air to be dehumidified in the energy storage battery is driven by an air driving unit (70) to sequentially pass through a fourth heat exchanger (60) and a third heat exchanger (50), the air to be dehumidified is dehumidified by the fourth heat exchanger (60), and the dehumidified air is returned to the temperature by the third heat exchanger (50).
CN201910257664.9A 2019-04-01 2019-04-01 Battery thermal management system with dehumidification function and dehumidification method thereof Active CN111769299B (en)

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