CN112428883A - Heating method and heating system for power battery of electric automobile - Google Patents
Heating method and heating system for power battery of electric automobile Download PDFInfo
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- CN112428883A CN112428883A CN202011272868.9A CN202011272868A CN112428883A CN 112428883 A CN112428883 A CN 112428883A CN 202011272868 A CN202011272868 A CN 202011272868A CN 112428883 A CN112428883 A CN 112428883A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring 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
- H01M10/61—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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Sustainable Energy (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
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Abstract
The application relates to a heating method of an electric automobile power battery, which comprises the following steps: when a power battery needs to be heated, acquiring the water inlet temperature and the battery temperature of the power battery; controlling the duty ratio of the working rotating speed of the battery water pump based on the relationship between the battery temperature and the first threshold value and the second threshold value; and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of a heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value. The heating power of the heating source can not be fully utilized in the related technology.
Description
Technical Field
The application relates to the technical field of electric automobiles, in particular to a heating method and a heating system for a power battery of an electric automobile.
Background
At present, most of electric automobiles adopt lithium batteries or lithium iron phosphate batteries which are sensitive to temperature, and when the temperature of the batteries is low, the capacity and energy of the batteries can be remarkably reduced, so that the endurance mileage of the electric automobiles is influenced. Moreover, during the charging process, the charging current of the battery is slowed down, and even the battery cannot be charged. These all affect the user experience.
China is vast in regions, a large number of regions with low average temperature exist, and users in low-temperature regions are obviously affected by the performance of the battery at low temperature when using the electric vehicle. Therefore, in cold regions, the batteries are heated first during the use of the electric vehicle.
At present, in some related technologies, a scheme of heating a battery through water circulation is adopted, and the scheme is to ensure that the temperature gradients of the water inlet temperature of the battery and the temperature of the battery are not too large in the heating process of the battery by controlling the target water inlet temperature of the battery, and simultaneously avoid the problems of poor uniformity inside the battery and large temperature gradient inside the battery caused by too high water inlet temperature of the battery.
However, this control method is only to simply set the target inlet water temperature of the battery to control the heating power of the heating source, and since the actual heating situation is not considered, this control method cannot fully utilize the heating power of the heating source, and the battery heating speed needs to be further optimized.
Disclosure of Invention
The embodiment of the application provides a heating method and a heating system for a power battery of an electric automobile, and aims to solve the problem that the heating power of a heating source cannot be fully utilized in the related art.
In a first aspect, a heating method for a power battery of an electric vehicle is provided, which includes the following steps:
when a power battery needs to be heated, acquiring the water inlet temperature and the battery temperature of the power battery;
controlling the duty ratio of the working rotating speed of the battery water pump based on the relationship between the battery temperature and the first threshold value and the second threshold value;
and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of a heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value.
In some embodiments, controlling the duty cycle of the operating speed of the battery water pump based on the magnitude relationship between the battery temperature and the first threshold and the second threshold comprises the following steps:
calculating the average temperature of the power battery according to the battery temperature;
judging the average temperature and the first preset average temperature and the second preset average temperature;
if the average temperature is not more than the first preset average temperature, controlling the battery water pump to operate at a first duty ratio;
if the average temperature is larger than or equal to the second preset average temperature, controlling the battery water pump to operate at a second duty ratio;
if the first preset average temperature is smaller than the average temperature and smaller than the second preset average temperature, controlling the battery water pump to carry out stepless speed regulation between the second duty ratio and the first duty ratio;
wherein the first duty cycle is greater than the second duty cycle.
In some embodiments, controlling the duty cycle of the operating speed of the battery water pump based on the magnitude relationship between the battery temperature and the first threshold and the second threshold comprises the following steps:
selecting the highest temperature and the lowest temperature of the power battery from the battery temperatures, and calculating the temperature difference value of the highest temperature and the lowest temperature;
judging the temperature difference value and the first preset temperature difference value and the second preset temperature difference value;
if the temperature difference value is larger than or equal to the first preset temperature difference value, controlling the battery water pump to operate at a first duty ratio;
if the temperature difference value is less than or equal to the second preset temperature difference value, controlling the battery water pump to operate at a second duty ratio;
if the second preset temperature difference value is smaller than the temperature difference value and smaller than the first preset temperature difference value, controlling the battery water pump to perform stepless speed regulation between the second duty ratio and the first duty ratio;
wherein the first duty cycle is greater than the second duty cycle.
In some embodiments, the method for controlling the heating power of the heat source based on the absolute value of the difference between the inlet water temperature and the average temperature and the magnitude relation between a third preset temperature difference value comprises the following steps:
judging the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude of a third preset temperature difference value;
if the temperature difference value is smaller than the third preset temperature difference value, controlling the heat source to work at the maximum power;
otherwise, dynamically controlling the heating power of the heat source so that the absolute value of the difference value between the inlet water temperature and the average temperature is approximately equal to a third preset temperature difference value.
In some embodiments, after controlling the heating power of the heat source, the control method further includes the steps of:
acquiring the lowest temperature and the average temperature of the power battery;
judging the minimum temperature and a first preset minimum temperature, and judging the average temperature and a third preset average temperature;
if the minimum temperature is not lower than a first preset minimum temperature and the average temperature is not lower than a third preset average temperature, closing the heat source;
and otherwise, returning to the relation between the absolute value of the difference value between the inlet water temperature and the average temperature and a third preset temperature difference value, and controlling the heating power of the heat source.
In some embodiments, after turning off the heat source, the control method further includes the steps of:
acquiring a temperature difference value between the highest temperature and the lowest temperature of the power battery;
judging the magnitude relation between the temperature difference value and a second preset temperature difference value;
if the temperature difference value is less than or equal to the second preset temperature difference value, the battery water pump is turned off;
otherwise, after controlling the battery water pump to operate for a set time at a third duty ratio, closing the battery water pump.
In some embodiments, the control method further comprises the step of determining whether the power cell requires heating.
In some embodiments, the determining whether the power battery needs to be heated includes:
acquiring the lowest temperature of the power battery;
judging the minimum temperature and a second preset minimum temperature;
if the minimum temperature is not higher than a second preset minimum temperature, the power battery needs to be heated, and a battery heating loop is started;
otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
In some embodiments, the determining whether the power battery needs to be heated includes:
acquiring the average temperature of the power battery;
judging the magnitude of the average temperature and a fourth preset average temperature;
if the average temperature is less than or equal to a fourth preset average temperature, the power battery needs to be heated, and a battery heating loop is started;
otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
In a second aspect, a heating system for a power battery of an electric vehicle is provided, which includes:
a first circuit having a heat source disposed thereon;
the second loop is provided with a power battery, a battery water pump and a temperature sensor, and the temperature sensor is used for measuring the water inlet temperature and the battery temperature of the power battery;
a communication valve for communicating or blocking the first circuit and the second circuit;
a controller to: when the power battery needs to be heated, controlling the communication valve to communicate the first loop and the second loop; controlling the duty ratio of the working rotating speed of the battery water pump based on the magnitude relation between the battery temperature and a first threshold value and a second threshold value; and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of the heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a heating method and a heating system for a power battery of an electric automobile, on one hand, the size of battery temperature data measured for a period of time is compared with a first threshold value and a second threshold value, and according to a comparison result, the duty ratio of the working speed of a battery water pump is controlled so as to utilize the large-flow working interval of the battery water pump to the maximum efficiency, and therefore the rapid temperature rise of the power battery is guaranteed. On the other hand, the average temperature is calculated through battery temperature data, the heating power of the heat source is controlled according to the magnitude relation between the absolute value of the difference value between the inlet water temperature and the average temperature of the power battery and a third preset temperature difference value, the temperature difference gradient between the inlet water temperature and the average temperature of the power battery is ensured to be in a proper working range, and meanwhile, the high-power working interval of the heat source is utilized to the maximum degree, and the rapid temperature rise of the power battery is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a heating method for a power battery of an electric vehicle according to an embodiment of the present application;
FIG. 2 is a flow chart of one manner of controlling the duty cycle of the operating speed of the battery water pump according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of another way to control the duty cycle of the operating speed of the battery water pump according to an embodiment of the present disclosure;
fig. 4 is a flowchart for controlling the heating power of the heat source according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a heating method of an electric automobile power battery, which can solve the problem that the heating power of a heating source cannot be fully utilized in the related art.
Referring to fig. 1, an embodiment of the present application provides a heating method for a power battery of an electric vehicle, which includes the following steps:
101: when the power battery needs to be heated, acquiring the water inlet temperature and the battery temperature of the power battery;
102: controlling the duty ratio of the working rotating speed of the battery water pump based on the relationship between the battery temperature and the first threshold value and the second threshold value;
103: based on the temperature of the battery, the average temperature of the power battery is calculated, and based on the absolute value of the difference between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value, the heating power of the heat source is controlled, wherein the third preset temperature difference value can be set according to actual conditions, and for example, can be 50 ℃.
The principle of this application does:
according to the heating method of the power battery, on one hand, the size of battery temperature data measured for a period of time is compared with the first threshold value and the second threshold value, and according to the comparison result, the working rotating speed duty ratio of the battery water pump is controlled to utilize the large-flow working interval of the battery water pump to the maximum efficiency, so that the rapid temperature rise of the power battery is guaranteed. On the other hand, the average temperature is calculated through battery temperature data, the heating power of the heat source is controlled according to the magnitude relation between the absolute value of the difference value between the inlet water temperature and the average temperature of the power battery and a third preset temperature difference value, the temperature difference gradient between the inlet water temperature and the average temperature of the power battery is ensured to be in a proper working range, and meanwhile, the high-power working interval of the heat source is utilized to the maximum degree, and the rapid temperature rise of the power battery is ensured.
It should be noted that, in this embodiment, step 102 and step 103 do not have an absolute sequence, that is, step 102 and step 103 may be performed simultaneously, or step 103 may be performed before step 102. This is because step 102 is to rapidly heat the power cells from the flow rate perspective of the medium circulating in the pipeline, and step 103 is to rapidly heat the power cells from the perspective of the heat source heating the medium.
In some preferred embodiments, the duty cycle of the operating speed of the battery water pump is controlled based on the magnitude relation between the battery temperature and the first threshold and the second threshold, and in specific implementation, there are several optional modes.
For example, referring to fig. 2, in an alternative mode, the following steps are included:
201: calculating the average temperature of the power battery according to the battery temperature; the measured temperature data for each cell over a period of time are summed and divided by the total number to obtain an average temperature.
202: judging the average temperature and the first preset average temperature and the second preset average temperature, wherein the first preset average temperature and the second preset average temperature can be set according to actual conditions, for example, the first preset average temperature can be 0 ℃, and the second preset average temperature can be 10 ℃;
203: if the average temperature is less than or equal to the first preset average temperature, which indicates that the battery temperature is lower at this time, the battery temperature needs to be increased at the maximum speed, and at this time, the battery water pump is controlled to operate at a first duty ratio, wherein the first duty ratio can be set to a larger value, such as 80%, 90%, or 100% duty ratio, and preferably, the battery water pump operates at 100% duty ratio;
204: if the average temperature is larger than or equal to a second preset average temperature, the battery temperature is higher at the moment, the battery water pump is controlled to operate at a second duty ratio at the moment, wherein the first duty ratio is larger than the second duty ratio, the energy consumption of the battery water pump can be properly reduced on the premise that the heating power is met, the second duty ratio can be set to be a smaller value, such as 50%, 40% or 30% duty ratio, and preferably, the battery water pump operates at 50% duty ratio.
205: and if the first preset average temperature is less than the average temperature and less than the second preset average temperature, controlling the battery water pump to perform stepless speed regulation between the second duty ratio and the first duty ratio so as to utilize the large-flow working interval of the battery water pump to the maximum efficiency, thereby ensuring the rapid temperature rise of the power battery.
For another example, referring to fig. 3, in another alternative mode, the method includes the following steps:
301: selecting the highest temperature and the lowest temperature of the power battery from the battery temperatures, and calculating the temperature difference value of the highest temperature and the lowest temperature;
302: judging the temperature difference value and the magnitudes of a first preset temperature difference value and a second preset temperature difference value, wherein the first preset temperature difference value and the second preset temperature difference value can be set according to actual conditions, for example, the first preset temperature difference value can be 8 ℃, and the second preset temperature difference value can be 5 ℃;
303: if the temperature difference value is larger than or equal to a first preset temperature difference value, the temperature difference inside the battery is large, large circulating water flow is needed to balance the internal temperature difference, and at the moment, the battery water pump is controlled to operate at a first duty ratio, so that the temperature difference between the highest temperature and the lowest temperature of the power battery is not too large;
304: if the temperature difference value is less than or equal to a second preset temperature difference value, the temperature difference inside the battery is small at the moment, the battery water pump is controlled to operate at a second duty ratio, on the premise that the heating power is met, the energy consumption of the battery water pump can be properly reduced, and the energy-saving management of the battery water pump is facilitated, wherein the first duty ratio is greater than the second duty ratio;
305: and if the second preset temperature difference value is smaller than the temperature difference value and smaller than the first preset temperature difference value, controlling the battery water pump to perform stepless speed regulation between the second duty ratio and the first duty ratio so as to utilize the large-flow working interval of the battery water pump to the maximum efficiency, thereby ensuring the rapid temperature rise of the power battery.
The two modes can be used independently or simultaneously, and when the two modes are used simultaneously, the judgment condition of any mode can be met.
Referring to fig. 4, in some preferred embodiments, the controlling the heating power of the heat source based on the absolute value of the difference between the inlet water temperature and the average temperature and the magnitude relation of the third preset temperature difference value includes the following steps:
401: judging the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude of a third preset temperature difference value;
402: if the temperature difference value is smaller than the third preset temperature difference value, the temperature difference between the water inlet temperature and the average temperature of the power battery is smaller, and at the moment, the heat source is controlled to work at the maximum power, so that the water inlet temperature of the power battery is ensured to be rapidly increased to heat the battery;
403: otherwise, the difference between the inlet water temperature of the power battery and the average temperature is larger, the inlet water temperature cannot be quickly raised by raising the heating power of the heat source, but the heating power of the heat source can be dynamically controlled through the PI, so that the absolute value of the difference between the inlet water temperature and the average temperature is approximately equal to the third preset temperature difference value, and the battery is heated by the highest inlet water temperature of the power battery on the premise of ensuring the internal temperature gradient of the battery, so that the rapid temperature rise of the battery is ensured.
In some preferred embodiments, after controlling the heating power of the heat source, the control method further includes the steps of:
501: acquiring the minimum temperature and the average temperature of the power battery;
502: judging the minimum temperature and the first preset minimum temperature, and the average temperature and the third preset average temperature;
503: if the minimum temperature is greater than or equal to the first preset minimum temperature and the average temperature is greater than or equal to the third preset average temperature, the power battery is heated to the target temperature at the moment, and the heat source can be turned off at the moment without reheating;
504: otherwise, returning to the relation between the absolute value of the difference value between the inlet water temperature and the average temperature and a third preset temperature difference value, and controlling the heating power of the heat source.
In some preferred embodiments, after the heat source is turned off, the control method further includes the step of determining whether the battery water pump is operating as follows:
601: acquiring a temperature difference value between the highest temperature and the lowest temperature of the power battery;
602: judging the magnitude relation between the temperature difference value and a second preset temperature difference value;
603: if the temperature difference value is less than or equal to a second preset temperature difference value, the battery water pump is turned off to save electricity;
604: otherwise, the battery water pump is controlled to operate at the third duty ratio for a set time, and then the battery water pump is turned off, so that the temperature difference in the battery is not too large when the vehicle works next time.
The third duty cycle may be set according to actual conditions, such as a 100% duty cycle, and the set time may also be set according to actual needs, such as 30 s.
In some preferred embodiments, the control method further comprises the step of determining whether the power cell needs to be heated.
In a particular implementation, there are several alternative ways.
For example, in an alternative mode, determining whether the power battery needs to be heated includes:
701: acquiring the lowest temperature of a power battery;
702: judging the minimum temperature and a second preset minimum temperature, wherein the second preset minimum temperature can be set according to an actual situation, such as 0 ℃;
703: if the minimum temperature is less than or equal to a second preset minimum temperature, the power battery needs to be heated, and a battery heating loop is started;
704: otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
For another example, in another alternative, the determining whether the power battery needs to be heated includes:
801: acquiring the average temperature of the power battery;
802: judging the magnitude of the average temperature and a fourth preset average temperature;
803: if the average temperature is less than or equal to a fourth preset average temperature, the power battery needs to be heated, and a battery heating loop is started, wherein the fourth preset average temperature can be set according to an actual situation, for example, can be 2 ℃;
804: otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
One of the two types is determined from the viewpoint of the lowest temperature inside the battery, and the other is determined from the viewpoint of the average temperature of the battery, and the two types may be used alone or simultaneously, and when used simultaneously, the determination conditions of either type may be satisfied.
In some preferred embodiments, the heat source employs a PTC heater or a heat pump system.
The embodiment of the application also provides a heating system of the power battery of the electric automobile, which comprises a first loop, a second loop, a communicating valve and a controller; wherein the content of the first and second substances,
a heat source is arranged on the first loop;
the second loop is provided with a power battery, a battery water pump and a temperature sensor, and the temperature sensor is used for measuring the water inlet temperature of the power battery and the temperature of the battery;
the communication valve is used for communicating or stopping the first loop and the second loop;
the controller is used for: when the power battery needs to be heated, the communication valve is controlled to communicate the first loop and the second loop; controlling the duty ratio of the working rotating speed of the battery water pump based on the relationship between the battery temperature and the first threshold value and the second threshold value; and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of the heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value.
It can be understood that the heating system provided in this embodiment is a product obtained based on the above embodiments of the heating method.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A heating method of a power battery of an electric automobile is characterized by comprising the following steps:
when a power battery needs to be heated, acquiring the water inlet temperature and the battery temperature of the power battery;
controlling the duty ratio of the working rotating speed of the battery water pump based on the relationship between the battery temperature and the first threshold value and the second threshold value;
and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of a heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value.
2. The heating method of the power battery of the electric automobile as claimed in claim 1, wherein the duty ratio of the operating speed of the battery water pump is controlled based on the magnitude relation between the battery temperature and the first threshold value and the second threshold value, and the method comprises the following steps:
calculating the average temperature of the power battery according to the battery temperature;
judging the average temperature and the first preset average temperature and the second preset average temperature;
if the average temperature is not more than the first preset average temperature, controlling the battery water pump to operate at a first duty ratio;
if the average temperature is larger than or equal to the second preset average temperature, controlling the battery water pump to operate at a second duty ratio;
if the first preset average temperature is smaller than the average temperature and smaller than the second preset average temperature, controlling the battery water pump to carry out stepless speed regulation between the second duty ratio and the first duty ratio;
wherein the first duty cycle is greater than the second duty cycle.
3. The heating method of the power battery of the electric automobile as claimed in claim 1, wherein the duty ratio of the operating speed of the battery water pump is controlled based on the magnitude relation between the battery temperature and the first threshold value and the second threshold value, and the method comprises the following steps:
selecting the highest temperature and the lowest temperature of the power battery from the battery temperatures, and calculating the temperature difference value of the highest temperature and the lowest temperature;
judging the temperature difference value and the first preset temperature difference value and the second preset temperature difference value;
if the temperature difference value is larger than or equal to the first preset temperature difference value, controlling the battery water pump to operate at a first duty ratio;
if the temperature difference value is less than or equal to the second preset temperature difference value, controlling the battery water pump to operate at a second duty ratio;
if the second preset temperature difference value is smaller than the temperature difference value and smaller than the first preset temperature difference value, controlling the battery water pump to perform stepless speed regulation between the second duty ratio and the first duty ratio;
wherein the first duty cycle is greater than the second duty cycle.
4. The method for heating the power battery of the electric vehicle as claimed in claim 1, wherein the heating power of the heat source is controlled based on the absolute value of the difference between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value, comprising the following steps:
judging the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude of a third preset temperature difference value;
if the temperature difference value is smaller than the third preset temperature difference value, controlling the heat source to work at the maximum power;
otherwise, dynamically controlling the heating power of the heat source so that the absolute value of the difference value between the inlet water temperature and the average temperature is approximately equal to a third preset temperature difference value.
5. The heating method of the power battery of the electric vehicle according to claim 1, wherein after controlling the heating power of the heat source, the control method further comprises the steps of:
acquiring the lowest temperature and the average temperature of the power battery;
judging the minimum temperature and a first preset minimum temperature, and judging the average temperature and a third preset average temperature;
if the minimum temperature is not lower than a first preset minimum temperature and the average temperature is not lower than a third preset average temperature, closing the heat source;
and otherwise, returning to the relation between the absolute value of the difference value between the inlet water temperature and the average temperature and a third preset temperature difference value, and controlling the heating power of the heat source.
6. The method for heating a power battery of an electric vehicle according to claim 5, wherein after turning off the heat source, the control method further comprises the steps of:
acquiring a temperature difference value between the highest temperature and the lowest temperature of the power battery;
judging the magnitude relation between the temperature difference value and a second preset temperature difference value;
if the temperature difference value is less than or equal to the second preset temperature difference value, the battery water pump is turned off;
otherwise, after controlling the battery water pump to operate for a set time at a third duty ratio, closing the battery water pump.
7. The method for heating the power battery of the electric vehicle according to claim 1, wherein: the control method further includes the step of determining whether the power battery needs to be heated.
8. The method for heating the power battery of the electric automobile according to claim 7, wherein the determining whether the power battery needs to be heated comprises:
acquiring the lowest temperature of the power battery;
judging the minimum temperature and a second preset minimum temperature;
if the minimum temperature is not higher than a second preset minimum temperature, the power battery needs to be heated, and a battery heating loop is started;
otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
9. The method for heating the power battery of the electric automobile according to claim 7, wherein the determining whether the power battery needs to be heated comprises:
acquiring the average temperature of the power battery;
judging the magnitude of the average temperature and a fourth preset average temperature;
if the average temperature is less than or equal to a fourth preset average temperature, the power battery needs to be heated, and a battery heating loop is started;
otherwise, the power battery does not need to be heated, and a battery heating loop is not started.
10. A heating system of a power battery of an electric vehicle is characterized by comprising:
a first circuit having a heat source disposed thereon;
the second loop is provided with a power battery, a battery water pump and a temperature sensor, and the temperature sensor is used for measuring the water inlet temperature and the battery temperature of the power battery;
a communication valve for communicating or blocking the first circuit and the second circuit;
a controller to: when the power battery needs to be heated, controlling the communication valve to communicate the first loop and the second loop; controlling the duty ratio of the working rotating speed of the battery water pump based on the magnitude relation between the battery temperature and a first threshold value and a second threshold value; and calculating the average temperature of the power battery based on the battery temperature, and controlling the heating power of the heat source based on the absolute value of the difference value between the inlet water temperature and the average temperature and the magnitude relation of a third preset temperature difference value.
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Application publication date: 20210302 |