CN112216905B - Storage battery temperature control system and method and vehicle with same - Google Patents
Storage battery temperature control system and method and vehicle with same Download PDFInfo
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- CN112216905B CN112216905B CN202010936498.8A CN202010936498A CN112216905B CN 112216905 B CN112216905 B CN 112216905B CN 202010936498 A CN202010936498 A CN 202010936498A CN 112216905 B CN112216905 B CN 112216905B
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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
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
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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
- H01M10/655—Solid structures for heat exchange or heat conduction
- H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
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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
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
- H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
Abstract
A temperature control system and method for a storage battery and a vehicle with the same are provided, wherein a motor cooling pipeline is arranged on a main temperature control pipeline, a storage battery heat preservation pipeline is arranged on a first temperature control branch pipeline, a radiator is arranged on a second temperature control branch pipeline, a third temperature control branch pipeline is a direct current pipeline, the first temperature control branch pipeline, the second temperature control branch pipeline and the third temperature control branch pipeline are connected in parallel, after the three temperature control branch pipelines are connected in parallel, one end of the three temperature control branch pipelines is connected with a liquid outlet of the motor cooling pipeline through a first flow control valve, the other end of the three temperature control branch pipelines is connected with a liquid inlet of the motor cooling pipeline, and a controller controls the first flow control valve according to temperature information of the motor cooling pipeline and the storage battery and current information of the storage battery so as to change the percentage of cooling liquid entering the first temperature control branch pipeline, the second temperature control branch pipeline and the third temperature control branch pipeline. The system can better ensure the operation of the storage battery at low temperature and improve the charging performance of the storage battery at low temperature.
Description
Technical Field
The invention relates to the technical field of vehicle part temperature control, in particular to a storage battery temperature control system and method and a vehicle with the storage battery temperature control system.
Background
The storage battery is used as an important part of the whole vehicle, which is necessary for supporting the power-on, the starting and the low-voltage load work of the vehicle, the charge and discharge capacity of the storage battery directly influences the function, the safety and the user experience of the whole vehicle, and particularly the charge and discharge performance at low temperature is very important.
Past automotive products have been powered primarily by conventional engine drives, and batteries have also often been placed in front cabin locations. The temperature of a front cabin of a traditional fuel vehicle, a PHEV/HEV and other vehicle types can be increased due to heat loss of an engine, and a storage battery in the front cabin has no serious difficult problem of charging in a low-temperature environment, so that the requirements for improving the low-temperature heating and low-temperature charging performance of the storage battery in the driving process are not urgent and unnecessary.
However, nowadays, storage batteries placed in a back-up compartment or a pure electric car are increasingly used, because no heat source or heat preservation measures are adopted to raise the working environment temperature of the storage batteries, the storage batteries have large internal resistance and reduced available capacity, and the low-temperature discharging and charging capacity is greatly reduced compared with the normal temperature, so that the problems of frequent power shortage of the storage batteries at low temperature, difficult low-temperature starting of the whole car and the like are caused.
In order to improve the large-current discharge capacity of the storage battery at a low temperature and ensure normal power supply and starting of a finished automobile, in the prior art, a heat preservation device is generally added on the storage battery, or the storage battery is heated in advance before the automobile is used, so that the low-temperature starting performance of the storage battery is improved. The above method will generate extra energy consumption, which is not beneficial to energy saving and increases the cost.
Disclosure of Invention
The invention provides a storage battery temperature control system, a storage battery temperature control method and a vehicle with the storage battery temperature control system.
The invention provides a storage battery temperature control system, which comprises a storage battery heat preservation pipeline, a motor cooling pipeline, a radiator, a first flow control valve, a temperature sensor for detecting the temperature of the motor cooling pipeline and the storage battery, a current sensor for detecting the current of the storage battery and a controller, wherein the storage battery temperature control system also comprises a main temperature control pipeline, a first branch temperature control pipeline, a second branch temperature control pipeline and a third branch temperature control pipeline, the motor cooling pipeline is arranged on the main temperature control pipeline, the storage battery heat preservation pipeline is arranged on the first branch temperature control pipeline, the radiator is arranged on the second branch temperature control pipeline, the third branch temperature control pipeline is a direct current pipeline, the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline are connected in parallel, after the three sub-temperature control pipelines are connected in parallel, one end of each sub-temperature control pipeline is connected with a liquid outlet of the motor cooling pipeline through a first flow control valve, and the other end of each sub-temperature control pipeline is connected with a liquid inlet of the motor cooling pipeline;
the temperature sensor transmits the detected temperature information of the motor cooling pipeline and the storage battery to the controller, the current sensor transmits the detected current information of the storage battery to the controller, and the controller controls the first flow control valve according to the temperature information of the motor cooling pipeline and the storage battery and the current information of the storage battery so as to change the percentage of cooling liquid entering the first temperature division control pipeline, the second temperature division control pipeline and the third temperature division control pipeline.
Further, the first flow control valve comprises a first three-way valve and a second three-way valve, the first three-way valve and the second three-way valve each comprise a liquid inlet and two liquid outlets, the liquid inlet of the first three-way valve is connected with the main temperature control pipeline, one liquid outlet of the first three-way valve is connected with one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, the other liquid outlet of the first three-way valve is connected with the liquid inlet of the second three-way valve, one liquid outlet of the second three-way valve is connected with the other one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, and the other liquid outlet of the second three-way valve is connected with the other one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, the controller controls the opening degrees of the first three-way valve and the second three-way valve to change the percentages of the cooling liquid entering the first temperature-dividing control pipeline, the second temperature-dividing control pipeline and the third temperature-dividing control pipeline.
Further, when the temperature of the storage battery is lower than a first temperature threshold value and the current of the storage battery is lower than the first current threshold value, the storage battery temperature control system enters a first mode, and the first flow control valve enables the cooling liquid flowing out of the motor cooling pipeline to flow back into the motor cooling pipeline through the third temperature control branch pipeline.
Further, when the difference between the temperature of the motor cooling pipeline and the temperature of the storage battery is greater than the second temperature threshold value, the storage battery temperature control system enters a second mode, and the first flow control valve enables cooling liquid flowing out of the motor cooling pipeline to enter a storage battery heat preservation pipeline in the first temperature sub-control pipeline.
Further, temperature sensor is including the first temperature sensor who detects motor body temperature to and the second temperature sensor who detects motor cooling in-line cooling liquid temperature, works as motor cooling in-line cooling liquid's temperature is higher than the third temperature threshold, perhaps when motor body's temperature is higher than the fourth temperature threshold, battery temperature control system enters mode three, first flow control valve makes and gets into first branch control by temperature change pipeline reaches the percentage basis of the cooling liquid in the second branch control by temperature change pipeline and motor body's temperature changes.
Further, the controller obtains a first temperature parameter according to the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, the first temperature parameter is the maximum value of the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, or the maximum value of the temperature difference between the temperature of the cooling liquid in the motor cooling pipeline and the third temperature threshold value and the temperature difference between the temperature of the motor body and the fourth temperature threshold value, and the larger the first temperature parameter is, the lower the percentage of the cooling liquid entering the storage battery heat preservation pipeline in the total amount is.
Further, when the temperature of the storage battery is higher than a fifth temperature threshold value, or the current of the storage battery is higher than a second current threshold value, the storage battery temperature control system enters a fourth mode, and the first flow control valve changes the percentages of the cooling liquids entering the first sub temperature control pipeline, the second sub temperature control pipeline and the third sub temperature control pipeline according to the temperature of the cooling liquid in the motor cooling pipeline, the temperature of the motor body and the temperature of the storage battery.
Further, the controller obtains a first temperature parameter according to the temperature of cooling liquid in the motor cooling pipeline and the temperature of the motor body, and obtains a second temperature parameter according to the temperature of the storage battery; the first flow control valve controls the percentage of the cooling liquid entering the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline according to the first temperature parameter and the second temperature parameter;
the first temperature parameter is the maximum value of the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, or the maximum value of the temperature difference between the temperature of the cooling liquid in the motor cooling pipeline and the third temperature threshold value and the temperature difference between the temperature of the motor body and the fourth temperature threshold value; the second temperature parameter is the temperature of the storage battery or the difference value between the temperature of the storage battery and a fifth temperature threshold value.
Further, the larger the first temperature parameter is, the larger the percentage of the cooling liquid flowing into the first sub temperature control pipeline and the second sub temperature control pipeline in the total amount is; under the condition that the percentage of the cooling liquid entering the third branch temperature control pipeline in the total amount is fixed, the larger the second temperature parameter is, the larger the percentage of the cooling liquid entering the second branch temperature control pipeline in the remaining cooling liquid is.
The invention also provides a temperature control method based on the storage battery temperature control system, which comprises the following steps:
collecting the temperatures of a motor cooling pipeline and a storage battery and the current in the storage battery;
and controlling a first flow control valve according to the temperatures of the motor cooling pipeline and the storage battery and the current in the storage battery so as to change the percentages of the cooling liquid entering the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline.
The invention also provides a vehicle which comprises the storage battery temperature control system.
In summary, in this embodiment, the storage battery is provided with the storage battery heat preservation pipeline, and the pipeline is connected to the motor cooling pipeline, so that a circulation pipeline of the cooling liquid can be established between the storage battery heat preservation pipeline and the motor cooling pipeline, and on the basis of the collected temperatures of the motor cooling pipeline and the storage battery, the waste heat taken away from the motor cooling pipeline is conducted into the storage battery through the cooling liquid according to the needs of the storage battery, so as to control the temperature of the storage battery. Through the mode, the performance of the storage battery at low temperature can be guaranteed on the basis of not consuming the electric quantity of the storage battery, furthermore, through the mode, the waste heat of the motor can be fully utilized, energy is saved, meanwhile, the mode is also equivalent to cooling the cooling liquid in the motor by using the storage battery, the range of recycling the waste heat of the motor is widened, and the heat energy recycling utilization rate is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a system block diagram of a battery temperature control system according to an embodiment of the present invention.
Fig. 2 is a system block diagram of the battery temperature control system of fig. 1.
Fig. 3 is a flowchart illustrating a method for controlling a temperature of a battery according to an embodiment of the present invention.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined objects, the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
The invention provides a storage battery temperature control system, a storage battery temperature control method and a vehicle with the storage battery temperature control system.
Fig. 1 is a system block diagram of a battery temperature control system according to an embodiment of the present invention, and fig. 2 is a system block diagram of the battery temperature control system in fig. 1. As shown in fig. 1 and 2, a battery temperature control system according to an embodiment of the present invention includes a battery warm-keeping line 10, a motor cooling line 20, a radiator 30, a first flow rate control valve 40, a temperature sensor 50 for detecting temperatures of the motor cooling line 20 and the battery, a current sensor 60 for detecting a battery current, and a controller 70, which are provided in the battery. The storage battery temperature control system further comprises a main temperature control pipeline 81, a first branch temperature control pipeline 82, a second branch temperature control pipeline 83 and a third branch temperature control pipeline 84. The motor cooling pipeline 20 is arranged on the main temperature control pipeline 81, the storage battery heat preservation pipeline 10 is arranged on the first branch temperature control pipeline 82, the radiator 30 is arranged on the second branch temperature control pipeline 83, and the third branch temperature control pipeline 84 is a direct-current pipeline, i.e. the cooling liquid flows into the third branch temperature control pipeline 84 and then directly flows out without exchanging heat with any device. The first branch temperature control pipeline 82, the second branch temperature control pipeline 83 and the third branch temperature control pipeline 84 are connected in parallel, one end of the first branch temperature control pipeline 82, the second branch temperature control pipeline 83 and the third branch temperature control pipeline 84 after being connected in parallel is connected with the liquid outlet of the motor cooling pipeline 20 through the first flow control valve 40, and the other end of the first branch temperature control pipeline, the second branch temperature control pipeline 83 and the third branch temperature control pipeline 84 after being connected in parallel is connected with the liquid inlet of the motor cooling pipeline 20, namely, the three branch temperature control pipelines after being connected in parallel and the main temperature control pipeline 81 form a circulation pipeline for cooling liquid to flow. The temperature sensor 50 transmits the detected temperature information of the motor cooling pipeline 20 and the storage battery to the controller 70, the current sensor 60 transmits the detected current of the storage battery to the controller 70, and the controller 70 controls the first flow control valve 40 to control the percentage of the cooling liquid entering the first temperature control branch pipeline 82, the second temperature control branch pipeline 83 and the third temperature control branch pipeline 84 according to the temperature information of the motor cooling pipeline 20 and the storage battery and the current information of the storage battery.
In this embodiment, the storage battery is provided with the storage battery heat preservation pipeline 10, and the pipeline is connected with the motor cooling pipeline 20, so that a circulation pipeline of cooling liquid can be established between the storage battery heat preservation pipeline 10 and the motor cooling pipeline 20, and on the basis of the collected temperatures of the motor cooling pipeline 20 and the storage battery, the waste heat taken away from the motor cooling pipeline 20 is conducted into the storage battery through the cooling liquid according to the needs of the storage battery, so as to control the temperature of the storage battery. Through the mode, the performance of the storage battery at low temperature can be guaranteed on the basis of not consuming the electric quantity of the storage battery, furthermore, through the mode, the waste heat of the motor can be fully utilized, energy is saved, meanwhile, the mode is also equivalent to cooling the cooling liquid in the motor by using the storage battery, the range of recycling the waste heat of the motor is widened, and the heat energy recycling utilization rate is improved.
Further, referring to fig. 1, in the present embodiment, the first flow control valve 40 includes a first three-way valve 41 and a second three-way valve 42, a third temperature control branch 84, a second temperature control branch 83 and a first temperature control branch 82 are sequentially disposed along the flow direction of the cooling liquid on the main temperature control branch 81, and the first three-way valve 41 is disposed between the third temperature control branch 84 and the main pipe. The first three-way valve 41 includes an inlet and two outlets, the inlet of the first three-way valve 41 is connected to the main temperature control pipeline 81, one outlet is connected to the third temperature control pipeline 84, and the other outlet is connected to the main temperature control pipeline 81, so that a part of the cooling liquid entering the first three-way valve 41 from the main temperature control pipeline 81 can flow into the third temperature control pipeline 84 through the outlets, and a part of the cooling liquid continues to flow downstream along the main temperature control pipeline 81. That is, after the coolant flows into the first three-way valve 41 in the main temperature control line 81, the battery temperature control system can control the flow rate of the coolant entering the third temperature control line 84 by controlling the opening degree of the first three-way valve 41.
Similarly, the second three-way valve 42 is disposed between the second branch temperature control pipeline 83 and the main temperature control pipeline 81, the second three-way valve 42 includes a liquid inlet and two liquid outlets, the liquid inlet of the second three-way valve 42 is connected to the main temperature control pipeline 81 at the downstream of the first three-way valve 41, one liquid outlet of the second three-way valve 42 is connected to the second branch temperature control pipeline 83, the other liquid outlet is connected to the main temperature control pipeline 81, the cooling liquid entering the second three-way valve 42 from the main temperature control pipeline 81 can partially flow into the second branch temperature control pipeline 83 through the liquid outlet, and the other part can continue to flow downward along the main temperature control pipeline 81. That is, the battery temperature control system can control the flow rate of the coolant flowing into the second temperature-control branch line 83 by controlling the opening degree of the second three-way valve 42 after the coolant flowing into the main temperature-control branch line 81 from the first three-way valve 41 flows into the second three-way valve 42.
It should be understood that, in this embodiment, the first sub temperature control pipeline 82, the second sub temperature control pipeline 83 and the third sub temperature control pipeline 84 may be arranged in various orders, as long as among the three sub temperature control pipelines, two sub temperature control pipelines located upstream of the main temperature control pipeline 81 are respectively connected to the main temperature control pipeline 81 through an outlet of a three-way valve. The three branch temperature control pipelines are connected in parallel, and the two branch temperature control pipelines positioned at the upstream of the main control pipeline are respectively connected with the main temperature control pipeline 81 through the liquid outlet of a three-way valve. The flow into the three main temperature control lines 81 can be controlled so that the battery temperature control system performs its own logic control.
Further, in order to more precisely control the battery temperature control system, the temperature sensor 50 includes a first temperature sensor 51 that detects the temperature of the motor body, a second temperature sensor 52 that detects the temperature of the cooling fluid in the motor cooling circuit 20, preferably the temperature of the cooling fluid at the outlet, and a third temperature sensor 53 that detects the temperature of the battery, preferably the temperature of the negative electrode of the battery.
Taking the connection relationship of the first sub temperature control pipeline 82, the second sub temperature control pipeline 83, the third sub temperature control pipeline 84, the first three-way valve 41 and the second three-way valve 42 in fig. 1 as an example, the battery temperature control system may have the following control modes.
In this embodiment, taking the first three-way valve 41 as an example, when the cooling liquid flowing from the liquid inlet of the first three-way valve 41 flows into the main temperature control pipeline 81 connected to the liquid outlet through the first three-way valve 41, the opening degree of the first three-way valve 41 is defined as 100%; when the coolant flowing from the inlet of the first three-way valve 41 passes through the first three-way valve 41 and then flows into the third temperature control line 84, the opening degree of the first three-way valve 41 is 0%. That is, in fig. 1, when the coolant flows all from the left side of the first three-way valve 41 to the right side of the first three-way valve 41, the opening degree of the first three-way valve 41 is 100%; when the coolant flows into the upper portion of the first three-way valve 41 from the left side of the first three-way valve 41, the opening degree of the first three-way valve 41 is 0%, and the more the percentage of the flow rate flowing into the right side of the first three-way valve 41 is in the range of 0 to 100% opening degree, the larger the opening degree of the first three-way valve 41 is. The opening degree of the second three-way valve 42 is defined the same as that of the first three-way valve 41.
In the battery temperature control system, it can be controlled by a mode one, a mode two, a mode three, and a mode four, and four control modes, in which the opening degrees of the first three-way valve 41 and the second three-way valve 42 are controlled as shown in table one:
table one: opening degree control lookup table for first three-way valve 41 and second three-way valve 42 in each mode
| Mode(s) | Opening of first three-way valve (%) | Opening of second three-way valve (%) |
| Mode one | 0 | 0 |
| Mode two | 100 | 100 |
| Mode three | 100 | Opening degree 1 |
| Mode four | Opening 2 | Opening degree 3 |
When the temperature of the storage battery is lower than the first temperature threshold value and the current of the storage battery is lower than the first current threshold value, at the moment, the temperature of the storage battery is lower, the current is smaller, the current of the storage battery cannot provide enough heat for the storage battery, and at the moment, the storage battery can be judged to have a heating requirement. Controller 70 may cause the battery temperature control system to enter mode one. In this embodiment, the first temperature threshold may be 10-30 deg.C, and the first current threshold may be 1-10A.
In mode one, the opening degree of the first three-way valve 41 may be 0% so that the coolant flowing out of the motor cooling line 20 directly flows into the third temperature control line 84 through the first three-way valve and then flows back into the motor cooling line 20 again. In this mode, since the third temperature-control branch line 84 is a line directly connected to the main temperature-control line 81, the heat of the coolant in the motor cooling line 20 is not dissipated, and if the temperature of the coolant in the motor cooling line 20 is low, the coolant can be rapidly raised, so that the temperature of the storage battery temperature control system can be rapidly stored, and meanwhile, the storage battery can be prepared for the subsequent temperature rise.
It is to be understood that, at this time, since the opening degree of the first three-way valve 41 is 0%, no coolant enters the main temperature control line 81 downstream of the first three-way valve 41, and the opening degree of the second three-way valve 42 may not be controlled. However, preferably, the opening degree of the second three-way valve 42 may be 0% in order to reduce heat exchange between the coolant flowing out of the third temperature-dividing control line 84 and the coolant in the second temperature-dividing control line 83 and the first temperature-dividing control line 82.
As the temperature of the cooling fluid in the motor cooling circuit 20 increases, when the difference between the temperature of the motor cooling circuit 20, preferably the temperature of the cooling fluid in the motor cooling circuit 20, and the temperature of the battery (i.e., the temperature of the cooling fluid in the motor cooling circuit 20 — the value of the temperature of the battery) is greater than the second temperature threshold, it can be determined that the cooling fluid in the motor cooling circuit 20 has sufficient thermal energy to heat the battery. Controller 70 causes the battery temperature control system to enter mode two. In this embodiment, the second temperature threshold is 3-15 ℃.
In the second mode, the opening degrees of the first three-way valve 41 and the second three-way valve 42 are both 100%, that is, the coolant flowing out of the motor cooling pipeline 20 enters the battery thermal insulation pipeline 10 in the first sub-temperature control pipeline 82 to heat the battery, and the coolant does not flow through the second sub-temperature control pipeline 83 and the third sub-temperature control pipeline 84. In this mode, the temperature of the battery increases due to heat exchange with the coolant having a relatively high temperature.
With the continued use of the motor and the storage battery, when the temperature of the cooling liquid in the motor cooling pipeline 20 is higher than the third temperature threshold or the temperature of the motor body is higher than the fourth temperature threshold, it indicates that the temperature of the cooling liquid at this time has risen to a level possibly exceeding the standard required by the storage battery, and the temperature of the motor has exceeded the standard, a part of the cooling liquid needs to enter the radiator 30 for heat dissipation, and the storage battery only needs to exchange heat with the rest of the cooling liquid, so that the storage battery and the motor body can be protected. At this time, the controller 70 controls the battery temperature control system to enter the third mode. In this embodiment, the third temperature threshold may be 40-50 ℃, and the fourth temperature threshold may be 50-70 ℃.
In the third mode, the opening degree of the first three-way valve 41 is 100%, the cooling liquid does not enter the third temperature control branch line 84, and the opening degree of the second three-way valve 42 (i.e., opening degree 1 in table one) is changed according to the real-time temperatures of the cooling liquid in the motor cooling line 20 and the motor body, that is, the percentages of the cooling liquid entering the first temperature control branch line 82 and the second temperature control branch line 83 are changed as needed.
More specifically, the controller may derive the first temperature parameter T1 according to the temperature of the cooling liquid in the motor cooling circuit 20 and the temperature of the motor body, where the first temperature parameter T1 may be a maximum value of the temperature of the cooling liquid in the motor cooling circuit 20 and the temperature of the motor body, i.e., T1 is max (motor body temperature; cooling liquid temperature in the motor cooling circuit 20), or a maximum value of a temperature difference between the cooling liquid temperature in the motor cooling circuit 20 and the third temperature threshold, and a temperature difference between the temperature of the motor body and the fourth temperature threshold, i.e., T1 is max (cooling liquid temperature in the motor cooling circuit 20-third temperature threshold; temperature of the motor body-fourth temperature threshold). Regarding the opening degree control of the second three-way valve 42 in the third mode, the following table two is shown:
table two: in the third mode, the opening degree (opening degree 1) of the second three-way valve 42 is controlled in the look-up table
| First temperature parameter T1 | ≤-2 | 0 | 2 | 4 | 6 | ≥8 |
| Opening degree 1 (%) | 100 | 90 | 60 | 40 | 10 | 0 |
As can be seen from table two, the larger the first temperature parameter T1, the stronger the heating capacity of the battery by the coolant. At this time, the lower the percentage of the coolant that needs to flow into the battery thermal insulation pipe 10 to the total amount, the larger the coolant that flows into the radiator 30, and the smaller the opening degree of the second three-way valve 42; accordingly, the smaller the first temperature parameter T1, the higher the percentage of the coolant flowing into the battery warm-up line 10, and the larger the opening degree of the second three-way valve 42.
As the battery continues to exchange heat with the coolant, the temperature of the battery continues to rise. When the temperature of the battery is higher than the fifth temperature threshold, or the current of the battery is higher than the second current threshold, that is, the performance of the battery itself is not affected by low temperature, or heat caused by the intensity of the current can be supplied to the battery, the controller 70 controls the battery temperature controller 70 to enter the mode four. In this embodiment, the fifth temperature threshold may be selected from 10 to 30 ℃, and the second current threshold may be selected from 4 to 20A, and it is understood that, at this time, the fifth temperature threshold may be equivalent to a more suitable operating temperature of the battery, the fifth temperature threshold needs to be greater than the first temperature threshold, and the second current threshold needs to be greater than the first current threshold.
In the fourth mode, since the temperature of the battery has already reached a suitable range, the battery temperature control system only needs to maintain the temperature of the battery. At this time, the opening degree of the first three-way valve 41 (i.e., opening degree 2 in table one) and the opening degree of the second three-way valve 42 (i.e., opening degree 3 in table one) are changed according to the real-time temperature of the cooling liquid in the motor cooling line 20, the real-time temperature of the motor body, and the real-time temperature of the battery so that the temperature of the battery is always kept near the fifth temperature threshold value.
More specifically, the controller may obtain a first temperature parameter T1 according to the temperature of the cooling liquid in the motor cooling pipeline 20 and the temperature of the motor body, and obtain a second temperature parameter T2 according to the temperature of the battery, so as to regulate and control the opening degrees of the first three-way valve 41 and the second three-way valve 42, where the first temperature parameter T1 takes a value as described above, and the second temperature parameter T2 is the temperature of the battery or a difference between the temperature of the battery and a fifth temperature threshold. In this mode, the cooling liquid may flow through all three temperature control pipelines.
In the fourth mode, the opening degree control of the first three-way valve 41 and the second three-way valve 42 is as shown in table three:
as can be seen from table three, the larger the first temperature parameter T1 is, the larger the percentage of the total amount of the coolant flowing into the first sub-temperature control pipeline 82 and the second sub-temperature control pipeline 83 through the first three-way valve 41 is, the more the coolant needs to be subjected to heat exchange, and the larger the opening degree of the first three-way valve 41 is; under the condition that the opening degree of the first three-way valve 41 is constant, that is, under the condition that the percentage of the coolant entering the third temperature control pipeline 84 is constant, the larger the second temperature parameter T2 is, the smaller the opening degree of the second three-way valve 42 is, that is, the higher the temperature of the battery is, the larger the percentage of the coolant needing to enter the radiator 30 for heat exchange is in the total coolant flowing through the first three-way valve 41 and entering the main temperature control pipeline 81 is; when the second temperature parameter T2 is constant, that is, when the battery temperature is kept constant, the greater the amount of heat in the motor cooling line 20, the greater the proportion of the coolant that needs to be introduced into the radiator 30 for heat exchange, that is, the greater the first temperature parameter T1, the greater the opening degree of the first three-way valve 41, and the smaller the opening degree of the second three-way valve 42, in order to keep the battery temperature constant.
Further, in this embodiment, the storage battery temperature control system further includes a power battery pack thermal management loop 90, the power battery pack thermal management loop 90 is connected to the main temperature control pipeline 81 through a second flow control valve 91, and when the temperature of the cooling liquid in the motor cooling pipeline 20 is greater than a seventh temperature threshold value, and the power battery sends a heating request and needs to be heated, the second flow control valve 91 communicates the power battery pack thermal management loop 90 with the main temperature control pipeline 81.
In the present embodiment, the second flow rate control valve 91 has only two states of fully open and fully closed, that is, the degree of opening is 100% when fully open and 0% when fully closed. In other embodiments, the second flow control valve 91 may also be controlled according to the temperature of the cooling fluid in the motor cooling circuit 20 and the battery pack thermal management needs.
Further, in this embodiment, the battery temperature control system further includes an external temperature sensor 54 for acquiring an external temperature, and when the external temperature is greater than a sixth temperature threshold, for example, 15 to 30 ℃, the battery temperature control system ends to exert an influence on the battery temperature.
Further, the storage battery heat preservation pipeline 10 includes a pipeline body wound outside the storage battery and a heat preservation layer coated outside the pipeline body so as to preserve heat of the cooling liquid in the pipeline. The heat preservation can be the heat preservation that PE expanded plastic made, and the pipeline body can be aluminium system heat transfer flat pipe. The pipeline body can be wound in various ways, such as winding from the bottom surface and the side surface, winding in a zigzag manner, winding diagonally, and the like. The pipeline body and battery, heat preservation and battery to and heat preservation and pipeline body all can be seamless contact.
Furthermore, cooling pipelines are arranged on the inverter, the DC/DC and the vehicle-mounted charger, and the main cooling pipeline 81 is communicated with the cooling pipelines to introduce the components into the heat exchange of the storage battery temperature control system provided by the invention.
The invention also provides a temperature control method based on the storage battery temperature control system, which comprises the following steps:
collecting the temperature of the motor cooling pipeline 20 and the storage battery, and the current in the storage battery;
the first flow control valve 40 is controlled according to the motor cooling line 20, the temperature of the battery, and the current in the battery to change the percentage of the cooling liquid entering the first sub temperature control line 82, the second sub temperature control line 83, and the third sub temperature control line 84.
The following description will be made of the transition between the modes that the battery undergoes when operating in a low-temperature environment in a normal state;
collecting the temperature of a motor body, the temperature of cooling liquid in a motor cooling pipeline 20, the temperature of a storage battery and the current of the storage battery;
entering a first mode when the temperature of the storage battery is lower than a first temperature threshold value and the current of the storage battery is lower than a first current threshold value;
when the difference between the temperature of the cooling liquid in the motor cooling pipeline 20 and the temperature of the storage battery is greater than a second temperature threshold value along with the increase of the temperature of the cooling liquid, entering a second mode;
as the temperature of the storage battery rises, entering a third mode when the temperature of the cooling liquid in the motor cooling pipeline 20 is higher than a third temperature threshold value or the temperature of the motor body is higher than a fourth temperature threshold value;
entering a fourth mode when the temperature of the storage battery is higher than a fifth temperature threshold value or the current of the storage battery is higher than a second current threshold value along with the temperature rise of the storage battery;
it should be noted that, if the temperature of the cooling liquid in the motor cooling pipeline 20 is lower than the third temperature threshold, or the temperature of the motor body is lower than the fourth temperature threshold, when the temperature of the battery is higher than the fifth temperature threshold, or the current of the battery is higher than the second current threshold, the mode two may directly enter the mode four;
and when the ambient temperature is greater than the sixth temperature threshold, ending the control of the storage battery temperature control system.
It is to be understood that the above-mentioned process is only a mode change process in a normal state when the battery is operated in a low-temperature environment, and it does not exclude the interconversion between the modes in some abnormal states.
The present invention also provides a vehicle including the above battery temperature control system, and for other technical features of the vehicle, please refer to the prior art, which is not described herein again.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A battery temperature control system, characterized by: the storage battery temperature control system comprises a storage battery heat preservation pipeline, a motor cooling pipeline, a radiator, a first flow control valve, a temperature sensor for detecting the temperatures of the motor cooling pipeline and the storage battery, a current sensor for detecting the current of the storage battery and a controller, wherein the storage battery temperature control system also comprises a main temperature control pipeline, a first branch temperature control pipeline, a second branch temperature control pipeline and a third branch temperature control pipeline, the motor cooling pipeline is arranged on the main temperature control pipeline, the storage battery heat preservation pipeline is arranged on the first branch temperature control pipeline, the radiator is arranged on the second branch temperature control pipeline, the third branch temperature control pipeline is a direct current pipeline, the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline are connected in parallel, and after the three branch temperature control pipelines are connected in parallel, one end of the three branch temperature control pipelines is connected with a liquid outlet of the motor cooling pipeline through the first flow control valve, the other end of the motor cooling pipeline is connected with a liquid inlet of the motor cooling pipeline;
the temperature sensor transmits the detected temperature information of the motor cooling pipeline and the storage battery to the controller, the current sensor transmits the detected current information of the storage battery to the controller, and the controller controls the first flow control valve according to the temperature information of the motor cooling pipeline and the storage battery and the current information of the storage battery so as to change the percentage of cooling liquid entering the first temperature division control pipeline, the second temperature division control pipeline and the third temperature division control pipeline.
2. The battery temperature control system according to claim 1, characterized in that: the first flow control valve comprises a first three-way valve and a second three-way valve, the first three-way valve and the second three-way valve each comprise a liquid inlet and two liquid outlets, the liquid inlet of the first three-way valve is connected with the main temperature control pipeline, one liquid outlet of the first three-way valve is connected with one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, the other liquid outlet of the first three-way valve is connected with the liquid inlet of the second three-way valve, one liquid outlet of the second three-way valve is connected with the other one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, and the other liquid outlet of the second three-way valve is connected with the other one of the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline, the controller controls the opening degrees of the first three-way valve and the second three-way valve to change the percentages of the cooling liquid entering the first temperature-dividing control pipeline, the second temperature-dividing control pipeline and the third temperature-dividing control pipeline.
3. The battery temperature control system according to claim 1, characterized in that: when the temperature of the storage battery is lower than a first temperature threshold value and the current of the storage battery is lower than a first current threshold value, the storage battery temperature control system enters a first mode, and the first flow control valve enables cooling liquid flowing out of the motor cooling pipeline to flow back into the motor cooling pipeline through the third temperature control pipeline.
4. The battery temperature control system according to claim 3, characterized in that: and when the difference value between the temperature of the motor cooling pipeline and the temperature of the storage battery is greater than a second temperature threshold value, the storage battery temperature control system enters a second mode, and the first flow control valve enables the cooling liquid flowing out of the motor cooling pipeline to enter a storage battery heat preservation pipeline in the first temperature division control pipeline.
5. The battery temperature control system according to claim 4, characterized in that: the temperature sensor comprises a first temperature sensor for detecting the temperature of the motor body and a second temperature sensor for detecting the temperature of cooling liquid in the motor cooling pipeline, when the temperature of the cooling liquid in the motor cooling pipeline is higher than a third temperature threshold value, or when the temperature of the motor body is higher than a fourth temperature threshold value, the storage battery temperature control system enters a third mode, the first flow control valve enables the temperature to enter the first temperature division control pipeline and the percentage of the cooling liquid in the second temperature division control pipeline is according to the cooling liquid in the motor cooling pipeline and the temperature of the motor body and changes.
6. The battery temperature control system according to claim 5, characterized in that: the controller obtains a first temperature parameter according to the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, the first temperature parameter is the maximum value of the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, or the temperature difference between the temperature of the cooling liquid in the motor cooling pipeline and the third temperature threshold value and the maximum value of the temperature difference between the temperature of the motor body and the fourth temperature threshold value, and the larger the first temperature parameter is, the lower the percentage of the cooling liquid entering the storage battery heat-preservation pipeline in the total amount is.
7. The battery temperature control system according to claim 5, characterized in that: when the temperature of the storage battery is higher than a fifth temperature threshold value, or the current of the storage battery is higher than a second current threshold value, the storage battery temperature control system enters a fourth mode, and the first flow control valve enables the percentage of the cooling liquid entering the first sub temperature control pipeline, the second sub temperature control pipeline and the third sub temperature control pipeline to be changed according to the temperature of the cooling liquid in the motor cooling pipeline, the temperature of the motor body and the temperature of the storage battery.
8. The battery temperature control system according to claim 7, characterized in that: the controller obtains a first temperature parameter according to the temperature of cooling liquid in the motor cooling pipeline and the temperature of the motor body, and obtains a second temperature parameter according to the temperature of the storage battery; the first flow control valve controls the percentage of the cooling liquid entering the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline according to the first temperature parameter and the second temperature parameter;
the first temperature parameter is the maximum value of the temperature of the cooling liquid in the motor cooling pipeline and the temperature of the motor body, or the maximum value of the temperature difference between the temperature of the cooling liquid in the motor cooling pipeline and the third temperature threshold value and the temperature difference between the temperature of the motor body and the fourth temperature threshold value; the second temperature parameter is the temperature of the storage battery or the difference value between the temperature of the storage battery and a fifth temperature threshold value.
9. The battery temperature control system according to claim 8, characterized in that: the larger the first temperature parameter is, the larger the percentage of the cooling liquid flowing into the first sub temperature control pipeline and the second sub temperature control pipeline in the total amount is; under the condition that the percentage of the cooling liquid entering the third branch temperature control pipeline in the total amount is fixed, the larger the second temperature parameter is, the larger the percentage of the cooling liquid entering the second branch temperature control pipeline in the remaining cooling liquid is.
10. A temperature control method based on the storage battery temperature control system according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
collecting the temperatures of a motor cooling pipeline and a storage battery and the current in the storage battery;
and controlling a first flow control valve according to the temperatures of the motor cooling pipeline and the storage battery and the current in the storage battery so as to change the percentages of the cooling liquid entering the first branch temperature control pipeline, the second branch temperature control pipeline and the third branch temperature control pipeline.
11. A vehicle, characterized in that: comprising a battery temperature control system according to any of claims 1 to 9.
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