CN115764083A - Method, medium and system for controlling battery temperature of electric vehicle - Google Patents
Method, medium and system for controlling battery temperature of electric vehicle Download PDFInfo
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- CN115764083A CN115764083A CN202211522754.4A CN202211522754A CN115764083A CN 115764083 A CN115764083 A CN 115764083A CN 202211522754 A CN202211522754 A CN 202211522754A CN 115764083 A CN115764083 A CN 115764083A
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Abstract
The invention belongs to the technical field of electric automobile thermal engineering, and particularly relates to a method for controlling the temperature of an electric automobile battery, which reduces the length of a temperature control pipeline of the whole automobile in a coupling type thermal management mode, saves energy and reduces noise, so that the energy of an air conditioner and a warm air system can be fully utilized; heating and cooling elements are reduced, the vehicle manufacturing cost is saved, the weight of the vehicle is reduced, and the endurance mileage of the whole vehicle is improved. The invention also provides a non-transient readable recording medium storing the program of the method and a system comprising the medium, wherein the program can be called by a processing circuit to execute the method.
Description
Technical Field
The invention belongs to the technical field of electric automobile thermal engineering, and discloses a method and a system for controlling the temperature of an electric automobile battery and a recording medium for storing a program capable of executing the method.
Background
The performance and the aging of the power battery are closely related to the temperature, under the low-temperature condition, the ion diffusion and the ion shift of the 36800can be inhibited, the working performance of the power battery is influenced, and even under the extreme temperature condition, the side reaction can occupy the dominant position, so that the power battery cannot work under the normal state; meanwhile, the battery is a device with high energy density, contains specific chemical substances inside, and can be subjected to thermal runaway due to rapid temperature rise under certain conditions, so that the whole battery is combusted and even exploded; therefore, controlling the operating temperature of the battery within a certain reasonable range is an important issue for the research of battery management systems.
In the existing electric vehicle battery temperature control management technology, batteries are often heated or cooled through a battery temperature control independent control unit, so that one set of system can additionally consume energy, equipment redundancy is caused, the space of a passenger cabin is occupied by a crowd, and the requirement of light weight of an automobile is not met.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method for controlling the temperature of an electric vehicle battery, which controls the temperature of the electric vehicle battery by heating and cooling a power battery using an existing warm air/air conditioning system, and specifically includes the following steps:
s1, connecting a warm air core pipe section of an automobile warm air system with a warm air medium path of a warm air/battery heat exchanger in parallel, and arranging stop valves on the warm air core pipe section and the warm air medium path;
s2, connecting an evaporator pipe section of an automobile air conditioning system with an air conditioning medium path of an air conditioning/battery heat exchanger in parallel, and arranging stop valves on the evaporator pipe section and the air conditioning medium path;
s3, coupling a battery temperature control circulation pipeline with a battery temperature control medium path of the heating ventilation/battery heat exchanger and the air conditioner/battery heat exchanger;
s4, when only the passenger compartment needs to be refrigerated, only opening the stop valves on the evaporator pipe section going to the automobile air-conditioning system, and closing the rest stop valves;
when only the passenger compartment needs to be heated, only the stop valves on the section of the warm air core pipe going to the automobile warm air system are opened, and the rest stop valves are closed;
when only the battery needs to refrigerate, only opening the stop valve on the air conditioning medium path to the automobile air conditioning system, and closing the rest stop valves;
when only the battery needs to be heated, only the stop valve on the heating and ventilation medium path to the automobile warm air system is opened, and the rest stop valves are closed;
and when the temperatures of the passenger compartment and the battery are required to be adjusted, the step of opening the corresponding stop valve in the steps is superposed, and the rest stop valves are closed.
The coupled thermal management system reduces the length of a temperature control pipeline of the whole automobile, saves energy and reduces noise, so that the energy of an air conditioner and a warm air system can be fully utilized; heating and cooling elements are reduced, the vehicle manufacturing cost is saved, more passenger cabin spaces are vacated, the weight of the vehicle is reduced, and the endurance mileage of the whole vehicle is improved.
Preferably, a three-way valve capable of adjusting the opening degree of the split flow is arranged at the split position where the warm air core pipe section and the warm ventilation medium path are connected in parallel.
Preferably, a three-way valve capable of adjusting the opening degree of the shunt flow is arranged at the shunt position where the evaporator pipe section and the air conditioning medium path are connected in parallel.
Therefore, the flow of the air conditioning/heating ventilation medium for controlling the temperature of the battery can be adjusted according to the returned cabin temperature signal and the battery temperature signal, and the temperature of the cabin and the battery can be adjusted more reasonably and uniformly.
Preferably, a motor of the water pump in the battery temperature control circulation pipeline is a variable frequency motor, and the rotating speed of the motor can be adjusted according to a temperature signal returned by a temperature sensor to an automobile central control unit.
This allows the system to have a faster strain capability to accommodate transient changes in battery temperature.
Another aspect of the present invention is to provide a non-transitory readable recording medium storing one or more programs including instructions that, when executed, cause a processing circuit to perform the method for controlling the temperature of a battery of an electric vehicle.
The present invention further provides a system for controlling a battery temperature of an electric vehicle, comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program comprises a plurality of instructions, and the processing circuit executes the program to perform the method for controlling a battery temperature of an electric vehicle.
Drawings
FIG. 1 is a schematic diagram of a temperature control process for an automotive battery including a heat pump air conditioning module according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a temperature control process of a vehicle battery without a heat pump air conditioning module according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any new work based on the embodiments of the present invention, are within the scope of protection of the present invention.
As shown in the drawings of the present specification, this embodiment is a method for controlling the temperature of a battery of an electric vehicle, where T is an abbreviation of a temperature sensor, and P & T is a abbreviation of a pressure/temperature sensor, and basic components of an automotive warm air system include a warm air water pump, a WPTC, a radiator/battery heat exchanger (Chiller i in the drawing), and a warm air core, which are connected by a circulation pipeline; the hot air core pipe section is connected with a heating and ventilation medium path of Chiller I in parallel, an electric three-way valve is arranged at the parallel shunt position, and stop valves are arranged on the hot air core pipe section and the heating and ventilation medium path; the basic components of the automobile air conditioning system comprise an electric compressor, a condenser, an expansion valve, an air conditioner/battery heat exchanger (Chiller II in the figure) and an evaporator which are connected by a circulating pipeline; the evaporator pipe section is connected with a Chiller II air-conditioning medium path in parallel, an electric three-way valve is arranged at the parallel shunt position, and stop valves are arranged on the evaporator pipe section and the air-conditioning medium path; some elements (including a liquid-gas separation tank, a four-way valve, an electronic expansion valve EXCV and a stop valve) and pipelines in the automobile air conditioning system are integrally manufactured into a heat pump air conditioning module (see figure 1), the heat pump air conditioning module adopted in the embodiment can further realize the functions of reducing the energy consumption of the whole automobile and prolonging the endurance, but the structure is more complex and the cost is higher, the heat pump air conditioning module can be used as an optional module for selection, and the whole functions of the system cannot be lost by canceling the module to restore into a normal pipeline (see figure 2).
The battery temperature control circulation pipeline comprises a battery water pump, a battery pack and battery temperature control medium paths in a Chiller I and a Chiller II which are connected in series through pipelines. Some elements not mentioned in the claims and summary are conventional arrangements of original systems and are not explained in detail.
The typical working mode of the invention is as follows: it should be noted that in this embodiment, the heat pump air conditioning module is selected to participate in the battery temperature control medium path circulation of the heating ventilation/battery heat exchanger, wherein the stop valve 2 is only set for maintenance and replacement or adding a refrigerant, and is normally open in the working state, which is equivalent to a section of pipeline, and does not participate in the stop valve control in the present invention.
A. Temperature rise of only the battery:
electric three-way valve 2 opens entirely, opens the stop valve 5 of going to Chiller I, closes other stop valves, and after WPTC heating warm medium, through Chiller I with heat exchange to the battery temperature control medium in. At the moment, the power of the electric compressor, the WPTC heating power and the rotating speed of the water pump can be controlled according to the temperature of the battery pack, and the Chiller II does not work.
B. Battery cooling only:
the electronic three-way valve 1 is fully opened, the stop valve 3 going to the Chiller II is opened, other stop valves are closed, the electronic expansion valve EXV is opened, and the liquid refrigerant takes away heat in the battery temperature control medium through the Chiller II. At the moment, the power of the electric compressor and the rotating speed of the water pump can be controlled according to the temperature of the battery pack, and the Chiller I heat exchanger does not work.
C. Warming of the passenger compartment only:
at the moment, the working mode of the heat pump air conditioning module is the same as A (only the battery is heated). Simultaneously electric three-way valve 2 opens entirely, opens the stop valve 6 of going to the warm braw core, closes other stop valves, and after WPTC heating warm medium, it dispels the heat to the passenger cabin in through the warm braw core. The electric compressor power, the WPTC heating power and the water pump rotation speed can be controlled according to the passenger compartment temperature at this time.
D. Cooling only the passenger compartment:
the heat pump air conditioning module now operates in the same mode as B (battery only cooling). Meanwhile, the electric three-way valve 1 is fully opened, the stop valve 4 going to the evaporator is opened, other stop valves are closed, the thermostatic expansion valve TXV is opened, and the liquid refrigerant takes away the heat in the passenger compartment through the evaporator. The electric compressor power can now be controlled in dependence on the passenger cabin temperature.
E. The combined working condition is as follows: battery warming + passenger compartment warming:
at the moment, the working modes of the heat pump air conditioning module are the same as those of A and C. Opening stop valve 6 and stop valve 5 to the warm braw core and to Chiller I, closing other stop valves, after WPTC heats the warm medium that leads to, the heat had both been exchanged to the battery temperature control medium through Chiller I, passed to the passenger cabin through the warm braw core again. The whole heat supply level can be adjusted by controlling WPTC heating power and the rotating speed of the water pump, the opening of the electric three-way valve 2 to the two branches is adjusted according to the heat supply quantity required by each branch, the heat supply requirements of each branch are balanced, and Chiller II does not work.
F. The combined working condition is as follows: battery cooling + passenger compartment cooling:
the working modes of the heat pump air conditioning module are the same as B and D. Shut-off valves 4 and 3 to the evaporator and to the Chiller II are opened and the other shut-off valves are closed. The electronic expansion valve EXV and the thermostatic expansion valve TXV are both opened, and the liquid refrigerant takes away the heat in the battery temperature control medium through the Chiller II and the heat in the passenger compartment through the evaporator. The load of the compressor is controlled to adjust the overall cooling level, the electric three-way valve 1 adjusts the opening degree of the two branches according to the cooling capacity required by each branch to balance the cooling demand of each branch, and the Chiller I does not work.
In the typical working mode of the invention, in order to meet the requirement of light weight of the whole vehicle, the electronic three-way valve and the stop valves which are branched to the branches through the pipelines can be integrated into a three-way flow divider valve with the functions of branch flow regulation and on-off.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computers, usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.), and having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 steps of the method are compiled into a program and then the program is stored in a hard disk or other non-transitory storage media to form the embodiment of the non-transitory readable recording medium of the invention; the storage medium is electrically connected with a computer processor, and the temperature control of the battery of the electric automobile can be completed through data processing, so that the embodiment of the system for controlling the temperature of the battery of the electric automobile is formed.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. 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 (6)
1. A method for controlling the temperature of a battery of an electric automobile is characterized by comprising the following steps:
s1, connecting a warm air core pipe section of an automobile warm air system with a warm air medium path of a warm air/battery heat exchanger in parallel, and arranging stop valves on the warm air core pipe section and the warm air medium path;
s2, connecting an evaporator pipe section of an automobile air conditioning system with an air conditioning medium path of an air conditioning/battery heat exchanger in parallel, and arranging stop valves on the evaporator pipe section and the air conditioning medium path;
s3, coupling a battery temperature control circulation pipeline with battery temperature control medium paths of the heating ventilation/battery heat exchanger and the air conditioner/battery heat exchanger;
s4, when only the passenger compartment needs to be refrigerated, only opening the stop valves on the evaporator pipe section going to the automobile air-conditioning system, and closing the rest stop valves;
opening only the shutoff valves on the warm air core section to the vehicle warm air system when only the passenger compartment needs to be heated, the remaining shutoff valves all being closed;
when only the battery needs to refrigerate, only opening the stop valve on the air conditioning medium path to the automobile air conditioning system, and closing the rest stop valves;
when only the battery needs to be heated, only the stop valve on the heating and ventilation medium path to the automobile warm air system is opened, and the rest stop valves are closed;
and when the temperatures of the passenger compartment and the battery need to be adjusted, the step of opening the corresponding stop valve in the steps is superposed, and the rest stop valves are closed.
2. The method for controlling the temperature of the battery of the electric vehicle according to claim 1, wherein: and a three-way valve capable of adjusting the opening degree of the split flow is arranged at the split flow position where the warm air core body pipe section and the warm ventilation medium path are connected in parallel.
3. The method for controlling the temperature of the battery of the electric vehicle according to claim 2, wherein: and a three-way valve capable of adjusting the opening degree of the shunt is arranged at the shunt position where the evaporator pipe section and the air conditioner medium path are connected in parallel.
4. The method for controlling the temperature of the battery of the electric automobile according to claim 3, wherein: the motor of the water pump in the battery temperature control circulation pipeline is a variable frequency motor, and the rotating speed of the motor can be adjusted according to a temperature signal returned by the temperature sensor to the central control unit of the automobile.
5. A non-transitory readable recording medium storing one or more programs comprising instructions which, when executed, cause a processing circuit to perform a method of electric vehicle battery temperature control according to any one of claims 1-4.
6. A system for controlling the temperature of a battery of an electric vehicle, comprising a processing circuit and a memory electrically coupled thereto, wherein the memory is configured to store at least one program, the program comprising a plurality of instructions, and the processing circuit executes the program to perform a method for controlling the temperature of a battery of an electric vehicle according to any one of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211522754.4A CN115764083A (en) | 2022-11-30 | 2022-11-30 | Method, medium and system for controlling battery temperature of electric vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211522754.4A CN115764083A (en) | 2022-11-30 | 2022-11-30 | Method, medium and system for controlling battery temperature of electric vehicle |
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| Publication Number | Publication Date |
|---|---|
| CN115764083A true CN115764083A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211522754.4A Pending CN115764083A (en) | 2022-11-30 | 2022-11-30 | Method, medium and system for controlling battery temperature of electric vehicle |
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| CN (1) | CN115764083A (en) |
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- 2022-11-30 CN CN202211522754.4A patent/CN115764083A/en active Pending
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