CN110048189B - Liquid-cooled battery thermal management system and control method thereof - Google Patents
Liquid-cooled battery thermal management system and control method thereof Download PDFInfo
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- CN110048189B CN110048189B CN201910334845.7A CN201910334845A CN110048189B CN 110048189 B CN110048189 B CN 110048189B CN 201910334845 A CN201910334845 A CN 201910334845A CN 110048189 B CN110048189 B CN 110048189B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides a liquid cooling battery thermal management system and a control method thereof, comprising a controller, a refrigeration loop and a battery temperature control loop, wherein the refrigeration loop comprises a compressor, a condenser and a heat exchanger, an outlet B at one end of the heat exchanger is connected with the compressor through a pipeline, the compressor is connected with the condenser through a pipeline, and an outlet of the condenser is connected with an inlet A at one end of the heat exchanger through a pipeline; the battery temperature control loop comprises a plurality of liquid cooling battery boxes, a sensor and a heater, wherein an outlet D at one end of the heat exchanger is connected to the heater through a pipeline, an outlet of the heater is divided into a plurality of branches through a pipeline, each branch is controlled by an independent flow control valve and is connected to one end of the corresponding liquid cooling battery box, and the other end of the liquid cooling battery box is connected to an inlet C at one end of the heat exchanger through a pipeline; temperature sensors are arranged at the outlet D and the inlet C of the heat exchanger; the controller receives signals collected by the temperature sensor and is electrically connected with the compressor, the condenser, the flow control valve and the heater.
Description
Technical Field
The disclosure relates to a liquid-cooled battery thermal management system and a control method thereof.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
With the rapid development of the electric automobile industry at home and abroad in recent years, the demand of the electric automobile for improving the energy density of the power battery is higher and higher. How to guarantee the thermal safety of the battery under high energy density and further improve the environmental applicability of the power battery is a key point of research in the field of battery thermal management for electric vehicles.
According to the knowledge of the inventor, at present, the battery thermal management mostly adopts an air cooling or natural cooling mode. With the increase of the energy density of the battery, the heat management mode cannot completely solve the problem that the complex temperature environment affects the performance of the battery in the use process of the electric automobile. And the heat management modes have low efficiency and poor effect, and are not beneficial to the popularization and application of the high-energy density battery in the electric automobile. The temperature rise of battery charging is fast, and high temperature leads to charging to fall and flows, and then the charge time lengthens, and long-time high temperature use can influence the cycle life of battery moreover. If the battery is severely over-heated, the thermal runaway of the battery can even be caused.
Disclosure of Invention
The liquid-cooled battery thermal management system and the control method thereof can effectively control the temperature of the battery, improve the environmental adaptability of the battery and ensure the service life of the battery to a certain extent.
According to some embodiments, the following technical scheme is adopted in the disclosure:
a liquid-cooled battery thermal management system comprising a controller, a refrigeration circuit, and a battery temperature control circuit, wherein:
the refrigeration loop comprises a compressor, a condenser and a heat exchanger, wherein an outlet B at one end of the heat exchanger is connected with the compressor through a pipeline, the compressor is connected with the condenser through a pipeline, and an outlet of the condenser is connected to an inlet A at one end of the heat exchanger through a pipeline;
the battery temperature control loop comprises a plurality of liquid cooling battery boxes, a sensor and a heater, an outlet D at one end of the heat exchanger is connected to the heater through a pipeline, an outlet of the heater is divided into a plurality of branches through a pipeline, each branch is controlled by an independent flow control valve and is connected to one end of the corresponding liquid cooling battery box, and the other end of the liquid cooling battery box is connected to an inlet C at one end of the heat exchanger through a pipeline;
temperature sensors are arranged at the outlet D and the inlet C of the heat exchanger;
the controller receives signals collected by the temperature sensor, is electrically connected with the compressor, the condenser, the flow control valve and the heater, and controls the compressor, the condenser, the flow control valve and the heater according to the temperature of the battery in the liquid cooling battery box and the signals collected by the temperature sensor.
In the scheme, the controller can judge the refrigerating (or heating) requirement of the battery according to the received temperature, and control the working states of the compressor, the condenser, the flow control valve and the heater so that the temperature of the battery can be kept in a better range; meanwhile, the flow of cooling liquid of different battery cooling branches can be adjusted by controlling the opening degree of the flow control valve, the temperature difference of each battery box is controlled within a set range, and the distribution uniformity of the battery temperature field is ensured.
As a further limitation, each liquid-cooled battery box is provided with a battery heating device.
As a further limitation, each branch is connected with a plurality of liquid-cooled battery boxes connected in series.
As a further limitation, the battery temperature control circuit further comprises a water tank and a water pump, the water tank is connected to the front end of the inlet C at one end of the heat exchanger, and the water pump is arranged on the connecting pipeline between the outlet D at one end of the heat exchanger and the heater.
As a further limitation, the water filling port of the water tank is provided with a mesh filter element, and the water tank is provided with a liquid cooling indicating device, the liquid cooling indicating device and a controller. The water tank is stored with cooling liquid, which can be water or other existing cooling liquid.
As a further limitation, the water pump is electrically connected to the controller. The addition of the water pump enables rapid circulation of the cooling fluid within the entire battery temperature control loop.
And when the liquid level information value received by the controller is lower than a set value, alarming for low liquid level.
Of course, the liquid cooling indicating device may be selected from the existing liquid level sensors, including but not limited to a floating ball type liquid level sensor and a static pressure type liquid level sensor, and the selection and the arrangement may be selected from the existing devices.
As a further limitation, the surface of the heat exchanger is provided with a heat insulation jacket. And the material of the heat insulation sleeve comprises but is not limited to aerogel, rubber and plastic sponge and other materials.
By way of further limitation, an electronic expansion valve is arranged at the front end of the inlet A at one end of the heat exchanger, and the electronic expansion valve is electrically connected with the controller.
As a further limitation, a fan is disposed on the condenser.
In another embodiment, the heat exchanger is connected in parallel with an evaporator, and the evaporator is connected with an evaporation fan.
In another embodiment, the heater is a PTC heater, or may be another auxiliary heating device, and may be heated by using residual heat.
An electric automobile adopts above-mentioned liquid cooling battery thermal management system.
The refrigeration control method based on the system comprises the steps that the controller receives the highest temperature and the lowest temperature of the batteries sent by each liquid-cooled battery box, when a first set condition is met, the controller controls one or more flow control valves to be opened completely, and meanwhile, a water pump is started to radiate heat of each liquid-cooled battery box through cooling liquid circulation; if the temperature of the battery still rises, when a second set condition is met, the controller controls the compressor to be started, and controls the electronic expansion valve to be started at the same time to forcibly refrigerate the cooling liquid; meanwhile, the temperature of the cooling liquid is detected through the temperature sensors, the temperature of a cooling liquid water outlet is adjusted through adjusting the opening degree of the electronic expansion valve by the controller, the highest temperature of the battery is controlled within a set threshold value, the temperature difference of the cooling liquid at the two temperature sensors is controlled within a set range until the highest temperature and the lowest temperature of the battery are reduced to a third set condition, and the water pump and all the flow control valves are closed by the controller.
Based on the heating control method of the system, the controller receives the highest temperature and the lowest temperature of the battery sent by the battery in real time, when the battery is in a discharging mode, the controller controls to start the battery heating device when a fourth set condition is met, and the controller controls to stop the battery heating device when a fifth set condition is met;
when the battery is in an external charging mode and a sixth set condition is met, the controller controls to start the battery heating device; and when the seventh set condition is met, the controller controls to turn off the battery heating device.
The first to seventh setting conditions are threshold ranges specifically set according to the highest and lowest temperatures of the battery, and may be specifically set according to the model, type, capacity, number, connection load, and the like of the specific battery.
Compared with the prior art, the beneficial effect of this disclosure is:
the battery temperature is optimized and thermally managed, the efficiency of a battery thermal management system is improved, the energy consumption is effectively reduced, the battery temperature is controlled within a better temperature range, the temperature difference is controlled within a set range, and the uniformity of the distribution of the battery temperature field is ensured. The environmental adaptability of the battery is improved to a certain extent, and the marketization application of the battery on the electric automobile can be promoted.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a diagram of a liquid-cooled battery thermal management architecture for direct heating of a battery box according to a first embodiment;
FIG. 2 is a diagram of a liquid-cooled battery thermal management architecture with independent PTC heating according to a second embodiment;
FIG. 3 is a diagram of an auxiliary heating structure using the waste heat of the whole vehicle according to the third embodiment;
FIG. 4 is an integrated architecture diagram of a battery refrigeration circuit and a vehicle air conditioner according to a fourth embodiment;
FIG. 5 is a refrigeration control logic diagram;
fig. 6 is a heating control logic diagram.
The specific implementation mode is as follows:
the present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The description of the embodiments uses numbers, letters, and words indicating directions or positional relationships, such as "1", "2", "a", "B", "C", D "," front "," rear "," upper "," lower "," left "," right "," front "," rear ", etc., for simplicity of description of the present invention, and is not intended to limit the present invention.
As shown in fig. 1, in a first embodiment, a liquid-cooled battery thermal management system includes a controller, a compressor, a condenser, a fan, an electronic expansion valve, a heat exchanger, a sensor, a water pump, a water tank, a flow control valve, a refrigerant line, a coolant line, a battery box with a liquid cooling function, and a battery heating device. The compressor, the condenser, the electronic expansion valve, the interface A and the interface B of the heat exchanger are connected into a refrigeration loop through refrigerant pipelines; the heat exchanger C interface, the heat exchanger D interface, the sensor 1, the water pump, the flow control valve, the liquid cooling battery box and the sensor 2 are connected into a battery temperature control loop through cooling liquid pipelines. The flow control valve is arranged on each battery liquid cooling branch, and the controller can adjust the flow of the cooling liquid through the opening value of the control valve. Each battery liquid cooling branch can be connected with 1-3 liquid cooling battery boxes in series; the liquid cooling battery box is provided with a heating device. The fan is mounted on the condenser.
The surface of the heat exchanger is stuck with a heat insulation material, and the heat insulation material comprises but is not limited to aerogel, rubber and plastic sponge and other materials.
The sensor 1 is used for acquiring the temperature of the cooling liquid at the pipe orifice C of the heat exchanger and transmitting the temperature to the controller for processing; and the sensor 2 is used for acquiring the temperature of the cooling liquid at the pipe orifice D of the heat exchanger and transmitting the temperature to the controller for processing.
The water tank is provided with a water filling port with a net-shaped filter element; the liquid cooling indicating device is arranged and can transmit liquid level information to the controller; and when the liquid level information value received by the controller is lower than a set value, alarming for low liquid level. The flow control valve has a flow real-time monitoring function and a flow size adjusting function.
And the battery heating device is integrated into the battery box. When the battery needs to be heated, the controller controls the heating function to be started, and the battery module is directly heated.
As shown in fig. 2, the battery cooling and thermal management structure and the technical solution of the second embodiment are the same as those of fig. 1, and are not described in detail herein. The heating method is different from the indirect heating method of fig. 1. Fig. 2 the battery heating device is an independent PTC heater, which is disposed on the main line of the liquid cooling pipeline and located in front of all battery boxes in the flow direction of the cooling liquid. The cooling liquid is heated to 20 ℃ by the PTC heater, circulated by the water pump, and heated to heat the battery.
As shown in fig. 3, the battery thermal management structure and the technical solution of the third embodiment are the same as those of fig. 1, and are not described in detail herein. The difference from the embodiment of fig. 1 is that an auxiliary heating device and a whole vehicle waste heat heating loop are arranged. The whole vehicle waste heat heating loop is provided with a water pump 2 and an electromagnetic valve and is connected with an auxiliary heating device through a pipeline. The auxiliary heating device is a heat exchanger, and preheating of a heat source of the whole vehicle is utilized to heat the cooling liquid to heat the battery. The plug-in hybrid electric vehicle or the extended range hybrid electric vehicle has the advantages that the waste heat source of the whole vehicle is one or more of cooling water of an engine, a tail gas heating heat source or cooling water of a driving motor; the waste heat source of the whole pure electric vehicle can drive motor cooling water; the waste heat source of the fuel cell automobile is one or more of cooling water of a driving motor and cooling water of a fuel cell.
As shown in fig. 4, the fourth embodiment provides an architecture embodiment in which a battery refrigeration circuit is integrated with a vehicle air conditioner, and the present embodiment includes a compressor, a condenser, a condensing fan, an evaporator, an evaporating fan, an electronic expansion valve 1, an electronic expansion valve 2, a heat exchanger, a sensor 1, and a sensor 2. The condensing fan is arranged on the condenser and is an axial flow fan; the evaporation fan is arranged on the evaporator and is a centrifugal fan; the compressor, the condenser, the condensing fan, the evaporator, the evaporating fan and the electronic expansion valve 1 form a refrigerating circuit of the passenger compartment; the compressor, the condenser, the condensing fan, the electronic expansion valve 2, the heat exchanger, the sensor 1 and the sensor 2 form a refrigerating circuit of the battery. This embodiment can effectively practice thrift whole car space, is convenient for arrange.
In the above embodiment, the controller receives the temperature of the battery box, determines the refrigeration (or heating) requirement of the battery, controls one or more of the water pump, the compressor, the electronic expansion valve, the flow control valve (or the heating device) and other components to work at the same time, and controls the temperature of the battery within the optimal temperature range of 20-40 ℃; meanwhile, the opening of the flow control valve is controlled, the flow of cooling liquid of different battery cooling branches is adjusted, the temperature difference of the batteries is controlled within 5 ℃, and the distribution uniformity of the temperature field of the batteries is ensured. The invention can optimally control the temperature of the battery, improve the environmental adaptability of the battery and promote the marketization of the battery on the electric automobile.
As shown in fig. 5, as a control method of the liquid-cooled battery thermal management system for four functions of the first embodiment to the second embodiment, the cooling mode control logic is as follows: and the controller receives the highest temperature T _ max and the lowest temperature T _ min of the battery sent by the battery in real time. When T _ max is more than or equal to 30 DEG C
The thermal management system enters a self-circulation mode controller to control one or more flow control valves to be opened completely, the opening degree of the flow control valves is 100%, and meanwhile, a water pump is started to dissipate heat for the battery box through cooling liquid circulation.
Further, if the battery temperature still rises, when T _ max is more than or equal to 35 ℃ and
the controller controls the opening of the compressor and the fan and controls the opening of the electronic expansion valve at the same time to forcibly refrigerate the cooling liquid; while the temperature of the coolant is detected by the sensor 1 and the sensor 2. The controller adjusts the temperature of the cooling liquid water outlet by adjusting the opening of the electronic expansion valve, controls the highest temperature of the battery within 40 ℃, and controls the temperature difference of the cooling liquid at the sensor 1 and the sensor 2 within 8 ℃.
Further, after the forced refrigeration mode is started, the temperature of the battery is reduced, and when T _ max is less than or equal to 30℃ or
The controller controls the compressor to stop, controls the electronic expansion valve to be closed at the same time, and controls the heat management system to return to a self-circulation mode; when T _ max is less than or equal to 28℃ or
The controller closes the water pump and all the flow control valves, and the thermal management system is shut down.
As shown in fig. 6, as the first to fourth embodiments can be shared, a battery charging heating thermal management control mode is logically controlled as follows: and the controller receives the highest temperature T _ max and the lowest temperature T _ min of the battery sent by the battery in real time. The battery is in a discharge mode when T _ min is less than or equal to 10 DEG C
The controller controls the battery heating device to be started; when T _ min is more than or equal to 20℃ or
The controller controls to turn off the battery heating device. The battery is in an external charging mode, when T _ min is less than or equal to 15 DEG C
The controller controls the battery heating device to be started; when T _ min is more than or equal to 20℃ or
The controller controls to turn off the battery heating device.
The threshold for setting and comparing the maximum temperature T _ max and the minimum temperature T _ min of the specific battery in the above embodiments may be adjusted or changed according to specific conditions such as the type, kind, capacity, number, connection load, and the like of the specific battery in other embodiments. Such modifications will readily occur to those skilled in the art and are not described herein, but are to be construed as within the scope of the present disclosure.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Although the present disclosure has been described with reference to specific embodiments, it should be understood that the scope of the present disclosure is not limited thereto, and those skilled in the art will appreciate that various modifications and changes can be made without departing from the spirit and scope of the present disclosure.
Claims (7)
1. A liquid cooling battery thermal management system, characterized by: including controller, refrigeration circuit and battery temperature control circuit, wherein:
the refrigeration loop comprises a compressor, a condenser and a heat exchanger, wherein an outlet B at one end of the heat exchanger is connected with the compressor through a pipeline, the compressor is connected with the condenser through a pipeline, and an outlet of the condenser is connected to an inlet A at one end of the heat exchanger through a pipeline; an electronic expansion valve is arranged at the front end of an inlet A at one end of the heat exchanger, and the electronic expansion valve is electrically connected with the controller;
the battery temperature control loop comprises a plurality of liquid cooling battery boxes, a sensor, a heater and a whole vehicle waste heat heating loop, an outlet D at one end of the heat exchanger is connected to the heater through a pipeline, an outlet of the heater is divided into a plurality of branches through pipelines, each branch is controlled by an independent flow control valve and is connected to one end of the corresponding liquid cooling battery box, and the other end of each liquid cooling battery box is connected to an inlet C at one end of the heat exchanger through a pipeline; the heater is an auxiliary heating device, the whole vehicle waste heat heating loop is provided with a water pump and an electromagnetic valve and is connected with the auxiliary heating device through a pipeline; each liquid cooling battery box is provided with a battery heating device, and when the battery needs to be heated, the controller controls the heating function to be started, so that the battery module is directly heated;
temperature sensors are arranged at the outlet D and the inlet C of the heat exchanger;
the battery temperature control loop further comprises a water tank and a water pump, the water tank is connected to the front end of an inlet C at one end of the heat exchanger, the water pump is arranged on a connecting pipeline between an outlet D at one end of the heat exchanger and the heater, and the water pump is electrically connected with the controller;
the controller receives signals collected by the temperature sensor, is electrically connected with the compressor, the condenser, the flow control valve and the heater, controls the compressor, the condenser, the flow control valve and the heater according to the temperature of the battery in the liquid cooling battery box and the signals collected by the temperature sensor, and receives the highest temperature T of the battery sent by the battery in real timemaxAnd a minimum temperature TminThe battery is in discharge mode, when TminAt 10 ℃ or lower and (T)max+Tmin) The temperature is less than or equal to 12 ℃, and the controller controls the starting of the battery heating device; when T isminNot less than 20 ℃ or (T)max+Tmin) The temperature of/2 is more than or equal to 22 ℃, the controller controls the battery heating device to be turned off, the battery is in an external charging mode, and when T is greater than or equal to 22 DEG, the battery heating device is turned offminNot more than 15 ℃ and (T)max+Tmin) The temperature is less than or equal to 18 ℃, and the controller controls the battery heating device to be started; when in useTminNot less than 20 ℃ or (T)max+Tmin) The temperature of/2 is more than or equal to 22 ℃, and the controller controls the battery heating device to be closed.
2. The liquid-cooled battery thermal management system of claim 1, wherein: each branch is connected with a plurality of liquid cooling battery boxes which are connected in series.
3. The liquid-cooled battery thermal management system of claim 1, wherein: the water filling port of the water tank is provided with a reticular filter element.
4. The liquid-cooled battery thermal management system of claim 1, wherein: and a heat insulation sleeve is arranged on the surface of the heat exchanger.
5. The liquid-cooled battery thermal management system of claim 1, wherein:
the heat exchanger is connected with an evaporator in parallel, and the evaporator is connected with an evaporation fan.
6. An electric vehicle employing the liquid-cooled battery thermal management system of any of claims 1-5.
7. Refrigeration control method based on the system according to any one of claims 1 to 5, characterized by: the controller receives the highest temperature and the lowest temperature of the battery sent by each liquid-cooled battery box, when a first set condition is met, the controller controls one or more flow control valves to be opened completely, and meanwhile, a water pump is started to radiate heat of each liquid-cooled battery box through cooling liquid circulation; if the temperature of the battery still rises, when a second set condition is met, the controller controls the compressor to be started, and controls the electronic expansion valve to be started at the same time to forcibly refrigerate the cooling liquid; meanwhile, the temperature of the cooling liquid is detected through the temperature sensors, the temperature of a cooling liquid water outlet is adjusted through adjusting the opening degree of the electronic expansion valve by the controller, the highest temperature of the battery is controlled within a set threshold value, the temperature difference of the cooling liquid at the two temperature sensors is controlled within a set range until the highest temperature and the lowest temperature of the battery are reduced to a third set condition, and the water pump and all the flow control valves are closed by the controller.
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| CN111370812B (en) * | 2020-02-21 | 2022-01-14 | 吉利汽车研究院（宁波）有限公司 | Battery heating control method, device and system and storage medium |
| CN111786049B (en) * | 2020-07-09 | 2024-05-07 | 大连理工大学 | Two-phase immersed cooling system with multiple modules sharing one condensing cavity for battery cooling |
| CN112038731A (en) * | 2020-07-30 | 2020-12-04 | 东风时代(武汉)电池系统有限公司 | Battery temperature control method, battery management controller, system and automobile |
| CN111993884B (en) * | 2020-08-25 | 2021-11-23 | 一汽解放青岛汽车有限公司 | Hybrid vehicle thermal management system and hybrid vehicle thermal management method |
| CN112186301B (en) * | 2020-09-29 | 2022-02-15 | 安徽江淮汽车集团股份有限公司 | Temperature control method of liquid-cooled battery pack, electric vehicle and readable storage medium |
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| DE102017206135A1 (en) * | 2017-04-10 | 2018-10-11 | Ford Global Technologies, Llc | Method for deicing an outside air side heat exchanger of a motor vehicle air conditioning system with heat pump and motor vehicle air conditioning system for carrying out the method |
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| CN108376808B (en) * | 2018-01-24 | 2020-07-28 | 福建省汽车工业集团云度新能源汽车股份有限公司 | Automobile battery temperature adjusting method |
| CN108482067B (en) * | 2018-05-21 | 2019-11-29 | 上海思致汽车工程技术有限公司 | A kind of energy-saving multiloop thermal management system of electric automobile |
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