CN112133979A - Power battery temperature control method and device and vehicle - Google Patents
Power battery temperature control method and device and vehicle Download PDFInfo
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- CN112133979A CN112133979A CN202010996416.9A CN202010996416A CN112133979A CN 112133979 A CN112133979 A CN 112133979A CN 202010996416 A CN202010996416 A CN 202010996416A CN 112133979 A CN112133979 A CN 112133979A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- 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
- B60L58/26—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 cooling
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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
- H01M10/60—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
- H01M10/61—Types of temperature control
- H01M10/617—Types of temperature control for achieving uniformity or desired distribution of 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
- H01M10/62—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
- H01M10/635—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
- H01M10/655—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
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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
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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
Abstract
The disclosure relates to a power battery temperature control method and device and a vehicle. Belonging to the field of battery temperature control, the method comprises the following steps: obtaining a plurality of cell temperature values of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery and is used for representing the current temperature of the different cell areas; and under the condition that the minimum cell temperature in the cell temperatures is greater than a preset first temperature threshold value, the maximum cell temperature in the cell temperatures is less than a preset second temperature threshold value, and the difference value between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold value, carrying out temperature adjustment on the power battery through a constant temperature mode so as to reduce the difference value between the temperature of a first cell area with the minimum cell temperature and the temperature of a second cell area with the maximum cell temperature.
Description
Technical Field
The disclosure relates to the field of battery temperature control, in particular to a power battery temperature control method, a power battery temperature control device and a vehicle.
Background
The power battery is used as a power source of a new energy vehicle, how to ensure normal work of the new energy vehicle, and the work is vital in an efficient working state, and the power battery can not work normally at high temperature, low temperature and when the temperature of the battery is uneven, so that the electric vehicle taking the power battery as the power source can not work normally, the driving feeling is influenced, and the endurance mileage is influenced.
In the related technology, a liquid cooling scheme is adopted gradually for battery thermal management, namely, the battery is heated when the temperature of the battery is low, and the battery is cooled when the temperature of the battery is high, so that the battery works at the optimal working temperature, the normal discharge characteristic of the battery is ensured, but effective treatment is not carried out when the temperature of a battery core is uneven.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a power battery temperature control method, device and vehicle.
According to a first aspect of the embodiments of the present disclosure, there is provided a power battery temperature control method, the method including:
obtaining a plurality of cell temperature values of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery and is used for representing the current temperature of the different cell areas;
when the minimum cell temperature in the plurality of cell temperatures is greater than a preset first temperature threshold, the maximum cell temperature in the plurality of cell temperatures is less than a preset second temperature threshold, and the difference between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, performing temperature adjustment on the power battery in a constant temperature mode to reduce the difference between the temperature of a first cell area having the minimum cell temperature and the temperature of a second cell area having the maximum cell temperature;
wherein the first temperature threshold is less than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is greater than the temperature difference first threshold.
Optionally, the temperature adjusting the power battery through the constant temperature mode includes:
controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold;
and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for liquid cooling of the power battery so as to pump the circulating liquid into the flow path.
Optionally, the constant temperature mode is exited when a temperature difference between the temperature of the first cell area and the temperature of the second cell area is smaller than a preset second temperature difference threshold.
Optionally, the method further comprises:
heating the power battery through a heating mode under the condition that the minimum cell temperature is smaller than the first temperature threshold value;
and cooling the power battery through a cooling mode under the condition that the maximum cell temperature is greater than the second temperature threshold value.
According to a second aspect of the embodiments of the present disclosure, there is provided a power battery temperature control apparatus, comprising:
the acquisition module is used for acquiring a plurality of cell temperatures of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery respectively and is used for representing the current temperature of the different cell areas;
the adjusting module is used for adjusting the temperature of the power battery through a constant temperature mode under the condition that the minimum cell temperature in the cell temperatures is greater than a preset first temperature threshold, the maximum cell temperature in the cell temperatures is less than a preset second temperature threshold, and the difference value between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, so as to reduce the difference value between the temperature of a first cell area with the minimum cell temperature and the temperature of a second cell area with the maximum cell temperature;
wherein the first temperature threshold is less than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is greater than the temperature difference first threshold.
Optionally, the adjusting module is specifically configured to:
controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold;
and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for liquid cooling of the power battery so as to pump the circulating liquid into the flow path.
Optionally, the adjusting module is further configured to:
and exiting the constant temperature mode when the temperature difference between the first battery cell area and the second battery cell area is smaller than a preset second temperature difference threshold value.
Optionally, the adjusting module is further configured to:
heating the power battery through a heating mode under the condition that the minimum cell temperature is smaller than the first temperature threshold value;
and cooling the power battery through a cooling mode under the condition that the maximum cell temperature is greater than the second temperature threshold value.
According to a third aspect of the embodiments of the present disclosure, there is provided another power battery temperature control apparatus including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method provided by the first aspect of the present disclosure.
According to a fourth aspect of the embodiments of the present disclosure, a vehicle is provided, which includes a power battery and a power battery temperature control device for implementing the steps of the method provided by the first aspect of the present disclosure.
Through the technical scheme, the technical scheme provided by the embodiment of the disclosure has at least the following beneficial effects: under the condition that the temperature difference of different areas of a power battery of a vehicle reaches a certain threshold value, the opening of the constant temperature mode is controlled to reduce the temperature difference between the different areas of the power battery, so that the temperature of the power battery is kept balanced, the discharging characteristic of the battery is ensured, and the endurance mileage is further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method for power cell temperature control according to an exemplary embodiment.
FIG. 2 is another flow chart illustrating a method of power cell temperature control according to an exemplary embodiment.
FIG. 3 is a block diagram illustrating a power cell temperature control apparatus according to an exemplary embodiment.
FIG. 4 is a block diagram illustrating another power cell temperature control apparatus according to an exemplary embodiment.
FIG. 5 is a block diagram of a vehicle shown according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect. The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units. It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
Fig. 1 is a flow chart illustrating a method for controlling the temperature of a power cell according to an exemplary embodiment, the method comprising the steps of, as shown in fig. 1:
s101, obtaining a plurality of cell temperatures of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery and is used for representing the current temperature of the different cell areas.
The power battery can be provided with a plurality of temperature sensors, and each sensor can acquire the battery cell temperature near the position of the sensor.
S102, when the minimum cell temperature of the cell temperatures is greater than a preset first temperature threshold, the maximum cell temperature of the cell temperatures is less than a preset second temperature threshold, and the difference between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, performing temperature adjustment on the power battery in a constant temperature mode to reduce the difference between the temperature of a first cell area with the minimum cell temperature and the temperature of a second cell area with the maximum cell temperature.
The first temperature threshold is smaller than the second temperature threshold, and the difference value between the first temperature threshold and the second temperature threshold is larger than the first temperature difference threshold.
In the embodiment of the disclosure, the first temperature threshold may represent a minimum value of a normal operating temperature of the power battery, the second temperature threshold may represent a maximum value of a normal operating temperature of the power battery, when a maximum value of a core temperature of a certain region of the power battery is lower than a preset maximum temperature threshold, and a minimum value of a core temperature of another region is higher than a preset minimum temperature threshold, and a temperature difference between the two regions reaches a certain threshold, the temperature of the power battery is adjusted in a constant temperature mode to reduce a temperature difference between different regions of the power battery, so that the power battery keeps temperature balance without integral heating or integral cooling, thereby ensuring a discharging characteristic of the battery, and further improving a cruising range.
In other optional embodiments, the temperature adjustment of the power battery through the constant temperature mode may specifically include: controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold; and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for cooling the power battery so as to pump the circulating liquid into the flow path. At this time, when the circulating liquid flows to the cell region higher than the target temperature, the region can be cooled, and when the circulating liquid flows to the cell region lower than the target temperature, the region can be heated. Optionally, the constant Temperature mode may also be implemented by combining a liquid cooling system and a PTC (positive Temperature coefficient) heater, where the liquid cooling system may have a plurality of flow paths to correspond to different cell areas, and each cell area may also be configured with a PTC heater, so that the Temperature of the area may be reduced by starting a water pump of the corresponding flow path of the liquid cooling system in an area with a higher Temperature, and the area may be heated by the PTC heater in an area with a lower Temperature, so as to reduce a difference between the Temperature of a first cell area having the minimum cell Temperature and the Temperature of a second cell area having the maximum cell Temperature.
In other optional embodiments, the constant temperature mode is exited when a difference between the temperature of the first cell region and the temperature of the second cell region is smaller than a preset second threshold value of temperature difference. At this moment, the battery can timely exit when the temperature difference of the battery cell is lower than a certain threshold value, so that the energy waste is reduced, and the threshold value can be the maximum value of the temperature difference of the power battery during the safe operation.
In other optional embodiments, in a case that the minimum cell temperature is less than the first threshold value of the temperature, the power battery is heated through a heating mode; and under the condition that the maximum cell temperature is greater than the second temperature threshold value, cooling the power battery through a cooling mode. At this moment, the minimum value of the cell temperature is lower than a preset first temperature threshold value or the maximum value of the cell temperature is higher than a preset second temperature threshold value, in order to avoid that the battery is too low in temperature or the battery life and the discharge performance are influenced, the power battery is controlled to enter a heating mode so that the cell temperature is increased rapidly, or the power battery is controlled to enter a cooling mode so that the cell temperature is decreased rapidly, so that the battery life and the discharge performance are improved.
Specifically, the heating mode can heat the power battery integrally by heating the temperature of the circulating liquid in the liquid cooling system, and at this time, the temperature of the circulating liquid can be greater than a second temperature threshold value, so that the rapid heating of the power battery is realized; the cooling mode can be through the temperature that reduces the circulation liquid in the liquid cooling system with whole cooling power battery, and the temperature of circulation liquid can be less than first temperature threshold value this moment, has realized power battery's quick cooling. Optionally, flow paths adopted in the liquid cooling system in the heating mode and the cooling mode can be different, so that the rapid switching of the temperature control mode can be realized by opening and closing water pumps corresponding to different flow paths, the heating of the circulating liquid is not required to be waited, and the reaction speed of the temperature control system is accelerated.
Fig. 2 is another flowchart of a method for controlling temperature of a power battery according to an exemplary embodiment of the present disclosure, as shown in fig. 2, the method includes the following steps:
s201, obtaining the cell temperatures of the power battery, wherein the cell temperatures are multiple, and each cell temperature corresponds to a different cell area of the power battery;
the power battery can be provided with a plurality of temperature sensors, and each sensor can acquire the battery cell temperature near the position of the sensor. It is worth to be noted that the minimum cell temperature is a minimum value of the obtained cell temperatures, the maximum cell temperature is a maximum value of the obtained cell temperatures, the first temperature threshold is smaller than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is larger than the first temperature difference threshold.
S202, judging whether the minimum cell temperature is smaller than a first temperature threshold value, and executing a step S203 to enter a heating mode to heat the power battery under the condition that the minimum cell temperature is smaller than the first temperature threshold value; if the minimum cell temperature is greater than the first temperature threshold, step S204 is performed.
S204, judging whether the maximum cell temperature is greater than a second temperature threshold, executing a step S205 under the condition that the maximum cell temperature is greater than the second temperature threshold, and entering a cooling mode to cool the power battery; if the maximum cell temperature is lower than the second temperature threshold, step S206 is performed.
S206, judging whether the difference value between the maximum cell temperature and the minimum cell temperature is larger than a first temperature difference threshold value, and executing a step S207 to enter a constant temperature mode to reduce the difference value between the minimum cell temperature and the maximum cell temperature under the condition that the difference value between the maximum cell temperature and the minimum cell temperature is larger than the first temperature difference threshold value; if the difference between the maximum cell temperature and the minimum cell temperature is smaller than the first threshold, step S208 is executed.
And S208, judging whether the difference value between the maximum cell temperature and the minimum cell temperature is greater than a second temperature difference threshold, and executing the step S209 to enter a holding mode under the condition that the difference value between the maximum cell temperature and the minimum cell temperature is greater than the second temperature difference threshold.
For example, the power battery is provided with a liquid cooling system, and all water pumps are turned off to save energy. The first temperature difference threshold value is larger than the second temperature difference threshold value, and the second temperature difference threshold value can represent the maximum temperature difference value of safe operation of the power battery.
By adopting the scheme, the temperature of the power battery is raised when being too low, the temperature of the power battery is lowered when being too high, the temperature difference is reduced when being too large, the power battery enters a keeping mode when the temperature difference is reduced to a certain threshold value, the power battery is ensured to be at a safer working temperature, the energy waste is reduced as much as possible, and the service life and the discharge performance of the power battery are improved.
Fig. 3 is a block diagram of a power battery temperature control device according to an exemplary embodiment of the present disclosure, and as shown in fig. 3, the device 30 includes an obtaining module 31 and an adjusting module 32:
an obtaining module 31, configured to obtain a plurality of cell temperatures of the power battery, where each of the cell temperature values corresponds to a different cell area of the power battery, and is used to represent a current temperature of the different cell area;
the adjusting module 32 is configured to, when a minimum cell temperature of the plurality of cell temperatures is greater than a preset first temperature threshold, and a maximum cell temperature of the plurality of cell temperatures is less than a preset second temperature threshold, and a difference between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, perform temperature adjustment on the power battery in a constant temperature mode to reduce a difference between a temperature of a first cell area having the minimum cell temperature and a temperature of a second cell area having the maximum cell temperature; the first temperature threshold is smaller than the second temperature threshold, and the difference value between the first temperature threshold and the second temperature threshold is larger than the first temperature difference threshold.
In the embodiment of the disclosure, the first temperature threshold may represent a minimum value of a normal operating temperature of the power battery, the second temperature threshold may represent a maximum value of a normal operating temperature of the power battery, and when a maximum value of a cell temperature of a certain region of the power battery is lower than a preset maximum temperature threshold, and a minimum value of a cell temperature of another region is higher than a preset minimum temperature threshold, and a temperature difference between the two regions reaches a certain threshold, the temperature of the power battery is adjusted in a constant temperature mode, so that the temperature of the power battery is balanced without integral heating or integral conditions, thereby ensuring a discharging characteristic of the battery, and further improving a cruising range.
By way of example, the adjustment module 32 may be specifically configured to: controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold; and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for cooling the power battery so as to pump the circulating liquid into the flow path. At this time, when the circulating liquid flows to the cell region higher than the target temperature, the region can be cooled, and when the circulating liquid flows to the cell region lower than the target temperature, the region can be heated. Optionally, the constant temperature mode may also be implemented by combining a liquid cooling system and a PTC heater, the liquid cooling system may have a plurality of flow paths to correspond to different cell regions, each cell region may also be configured with the PTC heater, the liquid cooling system may be started to cool the region by starting a water pump corresponding to the flow path in the liquid cooling system in a region with a higher temperature, and the PTC heater may be used to heat the region in a region with a lower temperature, so as to reduce a difference between a temperature of a first cell region having the minimum cell temperature and a temperature of a second cell region having the maximum cell temperature.
Illustratively, the adjustment module 32 is further configured to: and exiting the constant temperature mode when the temperature difference between the first battery cell area and the second battery cell area is smaller than a preset second temperature difference threshold value. At this moment, the battery can timely exit when the temperature difference of the battery cell is lower than a certain threshold value, so that the energy waste is reduced, and the threshold value can be the maximum value of the temperature difference of the power battery during the safe operation.
Illustratively, the adjustment module 32 is further configured to: heating the power battery through a heating mode under the condition that the minimum cell temperature is less than the first temperature threshold; and heating the power battery through a heating mode under the condition that the maximum cell temperature is greater than the second temperature threshold value. At this moment, the minimum value of the cell temperature is lower than a preset first temperature threshold value or the maximum value of the cell temperature is higher than a preset second temperature threshold value, in order to avoid that the battery is too low in temperature or the battery life and the discharge performance are influenced, the power battery is controlled to enter a heating mode so that the cell temperature is increased rapidly, or the power battery is controlled to enter a cooling mode so that the cell temperature is decreased rapidly, so that the battery life and the discharge performance are improved.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
An exemplary embodiment of the present disclosure also provides another power battery temperature control apparatus, including:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to implement the steps of the method provided by the above-mentioned method embodiments.
In a possible implementation manner, the power battery temperature control device may be a part of a vehicle battery management system BMS or a part of a vehicle controller, and fig. 4 provides a structural block diagram of the power battery temperature control device, including: a processor 41 and a memory 42. The power cell temperature control device 40 may also include one or more of an input/output (I/O) interface 43, and a communication assembly 44.
The processor 41 is configured to control the overall operation of the power battery temperature control device 40, so as to complete all or part of the steps in the power battery temperature control method. Memory 42 is used to store various types of data to support operation at the power cell temperature control device 40, which may include, for example, instructions for any application or method operating on the power cell temperature control device 40, as well as application-related data, such as a first temperature threshold, a second temperature threshold, a first temperature difference threshold, and so forth. The Memory 42 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The communication component 44 is used for wired or wireless communication between the power battery temperature control device 40 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, which is not limited herein. The corresponding communication component 44 may thus comprise: Wi-Fi module, Bluetooth module, NFC module, etc.
In an exemplary embodiment, the power battery temperature control Device 40 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components for executing the above power battery temperature control method.
In another exemplary embodiment, there is also provided a computer readable storage medium comprising program instructions which, when executed by a processor, implement the steps of the power cell temperature control method described above. For example, the computer readable storage medium may be the memory 42 including program instructions executable by the processor 41 of the power battery temperature control device 40 to perform the power battery temperature control method described above.
Fig. 5 is a block diagram of a vehicle according to an exemplary embodiment, and as shown in fig. 5, the vehicle 50 includes a power battery 51 and a power battery temperature control device 30 (specifically, the corresponding description may be referred to, and is not described herein again), alternatively, the vehicle 50 may also include the power battery temperature control device 40, which is not limited in this disclosure. The power battery temperature control device is used for executing the power battery temperature control method. Those skilled in the art should appreciate that, in the implementation, the hybrid vehicle further includes other components, fig. 5 only shows the parts related to the embodiment of the present disclosure, and other necessary vehicle components are not shown.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A power battery temperature control method is characterized by comprising the following steps:
obtaining a plurality of cell temperature values of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery and is used for representing the current temperature of the different cell areas;
when the minimum cell temperature in the plurality of cell temperatures is greater than a preset first temperature threshold, the maximum cell temperature in the plurality of cell temperatures is less than a preset second temperature threshold, and the difference between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, performing temperature adjustment on the power battery in a constant temperature mode to reduce the difference between the temperature of a first cell area having the minimum cell temperature and the temperature of a second cell area having the maximum cell temperature;
wherein the first temperature threshold is less than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is greater than the temperature difference first threshold.
2. The method of claim 1, wherein the temperature regulating the power cell via a constant temperature mode comprises:
controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold;
and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for liquid cooling of the power battery so as to pump the circulating liquid into the flow path.
3. The method of claim 1, further comprising:
and exiting the constant temperature mode when the temperature difference between the first battery cell area and the second battery cell area is smaller than a preset second temperature difference threshold value.
4. The method according to any one of claims 1-3, further comprising:
heating the power battery through a heating mode under the condition that the minimum cell temperature is smaller than the first temperature threshold value;
and cooling the power battery through a cooling mode under the condition that the maximum cell temperature is greater than the second temperature threshold value.
5. A power cell temperature control apparatus, the apparatus comprising:
the acquisition module is used for acquiring a plurality of cell temperatures of the power battery, wherein each cell temperature value in the plurality of cell temperature values corresponds to a different cell area of the power battery respectively and is used for representing the current temperature of the different cell areas;
the adjusting module is used for adjusting the temperature of the power battery through a constant temperature mode under the condition that the minimum cell temperature in the cell temperatures is greater than a preset first temperature threshold, the maximum cell temperature in the cell temperatures is less than a preset second temperature threshold, and the difference value between the minimum cell temperature and the maximum cell temperature is greater than a preset first temperature difference threshold, so as to reduce the difference value between the temperature of a first cell area with the minimum cell temperature and the temperature of a second cell area with the maximum cell temperature;
wherein the first temperature threshold is less than the second temperature threshold, and a difference between the first temperature threshold and the second temperature threshold is greater than the temperature difference first threshold.
6. The apparatus of claim 5, wherein the adjustment module is specifically configured to:
controlling the temperature of circulating liquid in the liquid cooling system to reach a target temperature, wherein the target temperature is greater than the first temperature threshold and less than the second temperature threshold;
and under the condition that the temperature of the circulating liquid reaches the target temperature, starting a water pump of a flow path for liquid cooling of the power battery so as to pump the circulating liquid into the flow path.
7. The apparatus of claim 5, wherein the adjustment module is further configured to:
and exiting the constant temperature mode when the temperature difference between the first battery cell area and the second battery cell area is smaller than a preset second temperature difference threshold value.
8. The apparatus of claim 5, wherein the adjustment module is further configured to:
heating the power battery through a heating mode under the condition that the minimum cell temperature is smaller than the first temperature threshold value;
and cooling the power battery through a cooling mode under the condition that the maximum cell temperature is greater than the second temperature threshold value.
9. A power battery temperature control device, characterized by comprising:
a memory having a computer program stored thereon;
a processor for executing the computer program in the memory to carry out the steps of the method of any one of claims 1 to 4.
10. A vehicle, characterized in that it comprises a power battery and a power battery temperature control device for implementing the steps of the method according to claims 1-4.
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| CN202010996416.9A CN112133979A (en) | 2020-09-21 | 2020-09-21 | Power battery temperature control method and device and vehicle |
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| CN113471567A (en) * | 2021-06-15 | 2021-10-01 | 东风柳州汽车有限公司 | Battery pack temperature difference control method, device, equipment and storage medium |
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