CN113525053B - Hybrid electric vehicle battery heating method, vehicle and computer readable storage medium - Google Patents
Hybrid electric vehicle battery heating method, vehicle and computer readable storage medium Download PDFInfo
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- CN113525053B CN113525053B CN202110688683.4A CN202110688683A CN113525053B CN 113525053 B CN113525053 B CN 113525053B CN 202110688683 A CN202110688683 A CN 202110688683A CN 113525053 B CN113525053 B CN 113525053B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
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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
- H01M10/62—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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
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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 invention discloses a method for heating a power battery of a hybrid electric vehicle, the vehicle and a computer readable storage medium, wherein the method comprises the following steps: the method comprises the steps of obtaining the temperature of a power battery, comparing the obtained temperature of the power battery with a temperature threshold value through presetting the temperature threshold value, and switching the oil injection state of an engine of the hybrid electric vehicle when the temperature of the power battery is lower than the preset temperature threshold value so that the power battery is used as a power source to discharge in the oil injection prohibition state, the power battery is charged in the oil injection permission state, and the working temperature of the power battery is increased in the charging and discharging process. Under the low-temperature working condition, the temperature of the power battery can quickly reach an ideal value, the working charge-discharge power of the power battery is ensured to be in an optimal range, the service life of the power battery is prolonged, and the driving consistency of the whole vehicle is kept.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a battery heating method for a hybrid electric vehicle, the vehicle and a computer readable storage medium.
Background
Under the rapid development of science and technology, new energy automobiles become a new trend of automobile development, and hybrid electric vehicles are widely concerned due to the characteristics of low oil consumption, low emission, low pollution, low noise and the like. The power battery of the hybrid electric vehicle is a key part of the electric vehicle, and directly influences the performance of the electric vehicle. The working performance of the power battery is greatly influenced by the temperature, generally, under the condition of low environmental temperature, due to the characteristics of the power battery, the charging and discharging power of a battery pack is severely limited, and the working state of the whole vehicle is greatly influenced.
Disclosure of Invention
The invention mainly aims to provide a method for heating a battery of a hybrid electric vehicle. The battery pack temperature control method aims at solving the problem of how to quickly reach an ideal value of the temperature of the battery pack at low temperature.
In order to achieve the purpose, the invention provides a hybrid electric vehicle battery heating method, which comprises the following steps:
acquiring the temperature of a power battery;
and when the temperature of the power battery is lower than a preset temperature threshold value, switching the oil injection state of an engine of the hybrid electric vehicle so as to improve the working temperature of the power battery in the charging and discharging process.
Optionally, when the temperature of the power battery is lower than a preset temperature threshold, switching an oil injection state of an engine of the hybrid electric vehicle, so that the working temperature of the power battery is raised in a charging and discharging process, includes:
when the temperature of the power battery is lower than a preset temperature threshold, acquiring the battery electric quantity of the power battery, and continuously judging whether the battery electric quantity exceeds a preset electric quantity interval;
when the battery electric quantity is lower than the preset electric quantity interval, controlling an engine oil nozzle to be opened so that the engine drives a generator to charge the power battery;
and when the battery electric quantity is higher than the preset electric quantity interval, controlling an oil nozzle of the engine to be closed so that the power battery drives the generator.
Optionally, the preset electric quantity interval is between a first electric quantity threshold and a second electric quantity threshold, where the first electric quantity threshold is smaller than the second electric quantity threshold.
Optionally, when the temperature of the power battery is lower than a preset temperature threshold, switching an oil injection state of an engine of the hybrid electric vehicle, so that the power battery raises a working temperature in a charging and discharging process includes:
when the temperature of the power battery is lower than a preset temperature threshold value, starting a low-temperature heating mode of the power battery;
and under the low-temperature heating mode of the power battery, switching the fuel injection state of an engine of the hybrid electric vehicle so as to increase the working temperature of the power battery in the charging and discharging processes.
Optionally, when the temperature of the power battery is lower than a preset temperature threshold, the step of starting the low-temperature heating mode of the power battery includes:
when the temperature of the power battery is lower than a preset temperature threshold, judging whether the current charging and discharging power of the power battery exceeds a power threshold;
and when the current charge and discharge power of the power battery does not exceed the power threshold, starting a low-temperature heating mode of the power battery.
Optionally, after the step of obtaining the temperature of the power battery, the method further includes:
and when the temperature of the power battery is greater than or equal to a preset temperature threshold value, closing the low-temperature heating mode of the power battery.
Optionally, the power battery is a power battery pack formed by combining a plurality of battery cells, and the step of obtaining the temperature of the power battery includes:
and acquiring the temperature of each battery cell of the power battery pack, and taking the lowest temperature value in the temperatures of all the battery cells as the temperature of the power battery.
In addition, in order to achieve the above object, the present invention also provides an automobile including a memory, a processor, and a hybrid vehicle battery heating program stored on the memory and operable on the processor, wherein: when executed by the processor, the hybrid vehicle battery heating program realizes the steps of the hybrid vehicle battery heating method.
In addition, in order to achieve the above object, the present invention also provides a computer readable storage medium, on which a hybrid vehicle power battery heating program is stored, the hybrid vehicle power battery heating program, when executed by a processor, implements the steps of the hybrid vehicle power battery heating method as described above.
According to the heating method of the power battery of the hybrid electric vehicle, the vehicle and the computer readable storage medium, the temperature of the power battery is obtained, the obtained temperature of the power battery is compared with the temperature threshold value through presetting a temperature threshold value, and when the temperature of the power battery is lower than the preset temperature threshold value, the oil injection state of an engine of the hybrid electric vehicle is switched, so that the power battery is used as a power source to discharge in the oil injection prohibition state, the power battery is charged in the oil injection permission state, and the working temperature of the power battery is increased in the charging and discharging process. Under the low-temperature working condition, the temperature of the power battery can quickly reach an ideal value, the working charge-discharge power of the power battery is ensured to be in an optimal range, the service life of the power battery is prolonged, and the driving consistency of the whole vehicle is maintained.
Drawings
Fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for heating a power battery of a hybrid electric vehicle according to a first embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a second embodiment of a method for heating a power battery of a hybrid electric vehicle according to the present invention;
FIG. 4 is a schematic flow chart illustrating a method for heating a power battery of a hybrid electric vehicle according to a third embodiment of the present invention;
FIG. 5 is a schematic flow chart illustrating a fourth embodiment of a method for heating a power battery of a hybrid electric vehicle according to the present invention;
FIG. 6 is a schematic flow chart illustrating a fifth embodiment of a method for heating a power battery of a hybrid electric vehicle according to the present invention;
fig. 7 is a schematic flow chart of a sixth embodiment of a method for heating a power battery of a hybrid electric vehicle according to the present invention.
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, fig. 1 is a schematic device structure diagram of a hardware operating environment according to an embodiment of the present invention.
The terminal of the embodiment of the invention can be an automobile. As shown in fig. 1, the vehicle may include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to implement connection communication among these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory such as a disk memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Optionally, the car may also include a camera, RF (Radio Frequency) circuitry, sensors, audio circuitry, wiFi modules, and the like. Such as light sensors, motion sensors, and other sensors, among others. Specifically, the light sensor may include an ambient light sensor that adjusts the brightness of the display screen based on the ambient light level and a proximity sensor that turns off the display screen and/or backlight when the hardware device is moved to the ear. Of course, the hardware device may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and so on, which are not described herein again.
Those skilled in the art will appreciate that the configuration of the vehicle shown in fig. 1 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is one type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a hybrid vehicle battery heating program.
In the terminal shown in fig. 1, the network interface 1004 is mainly used for connecting a background server and communicating data with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to invoke the hybrid vehicle battery heating program stored in the memory 1005 and perform the following operations:
acquiring the temperature of a power battery;
and when the temperature of the power battery is lower than a preset temperature threshold value, switching the oil injection state of an engine of the hybrid electric vehicle so as to improve the working temperature of the power battery in the charging and discharging process.
Further, the processor 1001 may be configured to invoke a hybrid vehicle battery heating program stored in the memory 1005, and further perform the following operations:
when the temperature of the power battery is lower than a preset temperature threshold value, acquiring the battery electric quantity of the power battery, and continuously judging whether the battery electric quantity exceeds a preset electric quantity interval;
when the battery electric quantity is lower than the preset electric quantity interval, controlling an oil nozzle of an engine to be opened so that the engine drives a generator to charge the power battery;
and when the battery electric quantity is higher than the preset electric quantity interval, controlling an oil nozzle of the engine to be closed so that the power battery drives the generator.
Further, the processor 1001 may be configured to invoke a hybrid vehicle battery heating program stored in the memory 1005, and further perform the following operations:
when the temperature of the power battery is lower than a preset temperature threshold value, starting a low-temperature heating mode of the power battery;
and under the low-temperature heating mode of the power battery, switching the fuel injection state of an engine of the hybrid electric vehicle so as to increase the working temperature of the power battery in the charging and discharging processes.
Further, the processor 1001 may be configured to invoke a hybrid vehicle battery heating program stored in the memory 1005, and further perform the following operations:
when the temperature of the power battery is lower than a preset temperature threshold, judging whether the current charging and discharging power of the power battery exceeds a power threshold;
and when the current charge and discharge power of the power battery does not exceed the power threshold, starting a low-temperature heating mode of the power battery.
Further, the processor 1001 may be configured to invoke a hybrid vehicle battery heating program stored in the memory 1005, and further perform the following operations:
and when the temperature of the power battery is greater than or equal to a preset temperature threshold value, closing the low-temperature heating mode of the power battery.
Further, the processor 1001 may be configured to invoke a hybrid vehicle battery heating program stored in the memory 1005, and further perform the following operations:
and acquiring the temperature of each battery cell of the power battery pack, and taking the lowest temperature value in the temperatures of all the battery cells as the temperature of the power battery.
The specific embodiment of the present invention applied to the vehicle is substantially the same as the following embodiments of the method for heating the battery of the hybrid vehicle, and will not be described herein again.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of a method for heating a battery of a hybrid electric vehicle according to the present invention, wherein the method for heating a battery of a hybrid electric vehicle includes the following steps:
step S100, acquiring the temperature of the power battery;
in this embodiment, the hybrid vehicle battery heating system on the vehicle obtains the temperature of the power battery from the battery management system, and the temperature information may be transmitted through a bus. For example, a temperature sensor is mounted on each battery cell of the power battery pack, the temperature information of the power battery is collected and transmitted to the battery management system through a bus, and the hybrid electric vehicle battery heating system can acquire the temperature of the power battery from the battery management system.
It is understood that the above-mentioned measuring method of the power battery temperature may be a thermocouple, an infrared imaging and a fiber grating, etc. which can reflect the battery temperature.
And step S200, when the temperature of the power battery is lower than a preset temperature threshold, switching the oil injection state of an engine of the hybrid electric vehicle so as to raise the working temperature of the power battery in the charging and discharging process.
The method comprises the steps of presetting a temperature threshold, wherein the temperature threshold can be set according to the relation between the charging and discharging performance of the power battery and the environment, and the temperature threshold is greater than or equal to the lowest temperature at which the charging and discharging of the power battery cannot influence the health degree of the power battery. After the temperature of the power battery is acquired, the acquired temperature of the power battery is compared with a preset temperature threshold, and when the temperature of the power battery is lower than the preset temperature threshold, the fuel injection state of an engine of the hybrid electric vehicle is controlled to be switched, so that the power battery is charged and discharged according to the switching of the fuel injection state of the engine, and the working temperature of the power battery is increased in the process of continuously charging and discharging the power battery.
In the embodiment of the invention, the temperature of the power battery is acquired, the acquired temperature of the power battery is compared with the temperature threshold value through presetting a temperature threshold value, and when the temperature of the power battery is lower than the preset temperature threshold value, the fuel injection state of an engine of the hybrid electric vehicle is switched, so that the power battery is used as a power source to discharge in the fuel injection prohibition state, the power battery is charged in the fuel injection permission state, and the working temperature of the power battery is increased in the continuous charging and discharging process. Under the low-temperature working condition, the temperature of the power battery can quickly reach an ideal value, the working charge-discharge power of the power battery is ensured to be in an optimal range, the service life of the power battery is prolonged, and the driving consistency of the whole vehicle is maintained.
Further, referring to fig. 3, fig. 3 is a schematic flowchart of a second embodiment of a method for heating a battery of a hybrid vehicle according to the present invention, based on the embodiment shown in fig. 2, in step S200, when the temperature of the power battery is lower than a preset temperature threshold, the step of switching the fuel injection state of the engine of the hybrid vehicle so as to raise the operating temperature of the power battery during charging and discharging includes:
step S210, when the temperature of the power battery is lower than a preset temperature threshold, acquiring the battery electric quantity of the power battery, and continuously judging whether the battery electric quantity exceeds a preset electric quantity interval;
step S211, when the battery electric quantity is lower than the preset electric quantity interval, controlling an engine oil nozzle to be opened so that the engine drives a generator to charge the power battery;
and S212, controlling an engine oil nozzle to be closed when the battery electric quantity is higher than the preset electric quantity interval so that the power battery drives the generator.
In this embodiment, an electric quantity interval is preset, when the temperature of the power battery is lower than a preset temperature threshold, the battery electric quantity of the power battery is acquired, the battery electric quantity of the power battery is compared with the preset electric quantity interval, when the acquired battery electric quantity of the power battery is lower than the preset electric quantity interval, the oil nozzle of the engine is controlled to be opened, the engine drives the generator to generate electricity, and the electric quantity of the power battery is increased through the charging of the generator. And when the acquired battery power of the power battery is higher than the preset power interval, controlling the fuel spray nozzle of the engine to be closed, driving the generator by the power battery, and reducing the power of the power battery. When the acquired battery electric quantity of the power battery is within a preset electric quantity interval, the current state of an oil nozzle of the engine is temporarily kept unchanged, if the current state of the oil nozzle of the engine is opened, after the battery electric quantity of the power battery is higher than the preset electric quantity interval, the oil nozzle of the engine is controlled to be closed, so that the power battery enters a discharging state, and if the current state of the oil nozzle of the engine is closed, after the battery electric quantity of the power battery is lower than the preset electric quantity interval, the oil nozzle of the engine is controlled to be opened, so that the power battery enters a charging state. The hybrid electric vehicle battery heating system continuously judges whether the battery electric quantity of the power battery exceeds a preset electric quantity interval, controls the opening and closing of an oil nozzle of an engine according to the battery electric quantity corresponding to the power battery, and enables the temperature of the power battery to rise in the process of continuously, quickly charging and quickly releasing the power battery under the condition that the temperature of the power battery is lower than a preset temperature threshold value. For example, in a hybrid electric vehicle with a power part consisting of an engine, a generator and a power battery, the engine drives the generator to generate electricity, the electric energy is transmitted to the battery through a controller, when the battery electric quantity of the power battery is lower than a preset electric quantity interval, an engine oil nozzle is opened, the engine is used as a power source to drive the generator to rapidly charge the power battery, when the battery electric quantity of the power battery is higher than the preset electric quantity interval, the engine oil nozzle is closed, the power battery is used as the power source to drive the generator, the engine is used as a generator load, the generator overcomes the friction force of the engine to work to promote the power battery to rapidly discharge, the power battery is rapidly charged and discharged to enable the battery electric quantity of the power battery to fluctuate up and down in the preset electric quantity interval, and the power battery is continuously charged and discharged to enable the temperature of the power battery to rise under the condition that the temperature of the power battery is lower than a temperature threshold value.
Further, in the second embodiment, the preset electric quantity interval of the power battery is between a first electric quantity threshold and a second electric quantity threshold, and the first electric quantity threshold is smaller than the second electric quantity threshold. For example, if the first electric quantity threshold is 20% and the second electric quantity threshold is 80%, the electric quantity interval is 20% -80%.
Further, referring to fig. 4, fig. 4 is a schematic flowchart of a third embodiment of a method for heating a battery of a hybrid electric vehicle according to the present invention, based on the embodiment shown in fig. 2, in step S200, when the temperature of the power battery is lower than a preset temperature threshold, the step of switching the fuel injection state of the engine of the hybrid electric vehicle so as to raise the operating temperature of the power battery during charging and discharging includes:
step S220, when the temperature of the power battery is lower than a preset temperature threshold value, starting a low-temperature heating mode of the power battery;
and step S221, switching the fuel injection state of the engine of the hybrid electric vehicle in the low-temperature heating mode of the power battery so as to raise the working temperature of the power battery in the charging and discharging process.
In the embodiment, the temperature of the power battery is compared with a preset temperature threshold, when the temperature of the power battery is lower than the preset temperature threshold, a low-temperature heating mode of the power battery is started, and after the low-temperature heating mode is entered, the fuel injection state of an engine of the hybrid power battery is controlled to be switched, so that the power battery is charged and discharged according to the switching of the fuel injection state of the engine, and the working temperature of the power battery is increased in the charging and discharging process of the power battery.
Further, referring to fig. 5, fig. 5 is a schematic flowchart of a fourth embodiment of a method for heating a battery of a hybrid electric vehicle according to the present invention, based on the embodiment shown in fig. 4, in step S220, when the temperature of the power battery is lower than a preset temperature threshold, the step of turning on a low-temperature heating mode of the power battery includes:
step S230, when the temperature of the power battery is lower than a preset temperature threshold, judging whether the current charging and discharging power of the power battery exceeds a power threshold;
and S231, when the current charge-discharge power of the power battery does not exceed the power threshold, starting a low-temperature heating mode of the power battery.
In the embodiment, a charge-discharge power threshold of the power battery is obtained in advance, the temperature of the power battery is compared with a preset temperature threshold, when the temperature of the power battery is lower than the preset temperature threshold, whether the current charge-discharge power of the power battery exceeds the charge-discharge power threshold is judged, and when the current charge-discharge power of the power battery does not exceed the power threshold, a low-temperature heating mode of the power battery is started, so that the damage to the power battery is avoided, and the service life of the power battery is shortened. When the charging and discharging power of the current power battery exceeds the power threshold value, the low-temperature heating mode of the power battery cannot be entered, and when the charging and discharging power of the power battery falls back to the range of the power threshold value, whether the low-temperature heating mode of the power battery is entered is determined according to the temperature of the power battery.
Further, referring to fig. 6, fig. 6 is a schematic flowchart of a fifth embodiment of a method for heating a battery of a hybrid electric vehicle according to the present invention, and based on the embodiment shown in fig. 4, after the step of acquiring the temperature of the power battery in step S100, the method further includes:
and step S240, when the temperature of the power battery is greater than or equal to a preset temperature threshold value, closing the low-temperature heating mode of the power battery.
In this embodiment, after entering the low-temperature heating mode of the power battery under the low-temperature working condition, the hybrid electric vehicle battery heating system on the vehicle can continuously monitor the temperature of the power battery, compare the temperature of the power battery with a preset temperature threshold, and close the low-temperature heating mode of the power battery when the temperature of the power battery is greater than or equal to the preset temperature threshold.
Further, referring to fig. 7, fig. 7 is a schematic flowchart of a sixth embodiment of a method for heating a battery of a hybrid electric vehicle according to the present invention, based on the embodiment shown in fig. 2, the power battery is a power battery pack formed by combining a plurality of battery cells, and the step S100 of obtaining the temperature of the power battery includes:
step S110, obtaining the temperature of each battery cell of the power battery pack, and taking the lowest temperature value of the temperatures of all the battery cells as the temperature of the power battery.
In this embodiment, the power battery is a power battery pack formed by combining a plurality of battery cells, the temperature of each battery cell is required to be obtained when the temperature of the power battery is obtained, and after the temperature of each battery cell of the power battery pack is obtained, the lowest temperature value of all the obtained temperatures is used as the temperature of the power battery. For example, in a power battery pack formed by connecting a plurality of battery cells in series, a temperature sensor is respectively mounted on the surface of a battery cell of each battery cell to acquire a temperature signal of each battery cell, the temperature signals are transmitted to a battery management system through a bus after the temperature sensors acquire the temperatures of the battery cells, and a hybrid electric vehicle battery heating system acquires the lowest temperature value of the temperatures corresponding to all the battery cells through the battery management system and takes the lowest temperature value as the temperature of the power battery.
In addition, the invention also provides a computer readable storage medium, on which the hybrid electric vehicle battery heating program is stored. The computer-readable storage medium may be the Memory 20 in the terminal of fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes instructions for causing an automobile with a processor to execute the hybrid vehicle battery heating method according to the embodiments of the present invention.
It is to be understood that throughout the description of the present specification, reference to the term "one embodiment", "another embodiment", "other embodiments", or "first through nth embodiments", etc., is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system 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 system. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A hybrid electric vehicle battery heating method is characterized by comprising the following steps:
acquiring the temperature of a power battery;
when the temperature of the power battery is lower than a preset temperature threshold value, switching the oil injection state of an engine of the hybrid electric vehicle so as to raise the working temperature of the power battery in the charging and discharging process;
when the temperature of the power battery is lower than a preset temperature threshold value, switching the oil injection state of an engine of the hybrid electric vehicle so as to enable the power battery to raise the working temperature in the charging and discharging process, wherein the step of switching the oil injection state of the engine of the hybrid electric vehicle comprises the following steps:
when the temperature of the power battery is lower than a preset temperature threshold value, acquiring the battery electric quantity of the power battery, and continuously judging whether the battery electric quantity exceeds a preset electric quantity interval;
when the battery electric quantity is lower than the preset electric quantity interval, controlling an oil nozzle of an engine to be opened so that the engine drives a generator to charge the power battery;
when the battery power is higher than the preset power interval, controlling an engine oil nozzle to be closed so that the power battery drives a generator, wherein the engine is used as the load of the generator;
and when the battery electric quantity is within a preset electric quantity interval, keeping the current state of an oil nozzle of the engine unchanged.
2. The method according to claim 1, wherein the preset electric quantity interval is between a first electric quantity threshold and a second electric quantity threshold, and wherein the first electric quantity threshold is smaller than the second electric quantity threshold.
3. The method for heating the battery of the hybrid electric vehicle according to claim 1, wherein the step of switching the fuel injection state of the engine of the hybrid electric vehicle when the temperature of the power battery is lower than a preset temperature threshold value so as to raise the working temperature of the power battery during charging and discharging comprises the steps of:
when the temperature of the power battery is lower than a preset temperature threshold value, starting a low-temperature heating mode of the power battery;
and under the low-temperature heating mode of the power battery, switching the fuel injection state of an engine of the hybrid electric vehicle so as to increase the working temperature of the power battery in the charging and discharging processes.
4. The hybrid vehicle battery heating method according to claim 3, wherein the step of turning on the power battery low-temperature heating mode when the temperature of the power battery is lower than a preset temperature threshold comprises:
when the temperature of the power battery is lower than a preset temperature threshold, judging whether the current charging and discharging power of the power battery exceeds a power threshold;
and when the current charge and discharge power of the power battery does not exceed the power threshold, starting a low-temperature heating mode of the power battery.
5. The method for heating the battery of the hybrid vehicle according to claim 3, wherein the step of obtaining the temperature of the power battery is followed by the step of:
and when the temperature of the power battery is greater than or equal to a preset temperature threshold value, closing the low-temperature heating mode of the power battery.
6. The method according to claim 1, wherein the power battery is a power battery pack formed by combining a plurality of battery cells, and the step of obtaining the temperature of the power battery comprises:
and acquiring the temperature of each battery cell of the power battery pack, and taking the lowest temperature value in the temperatures of all the battery cells as the temperature of the power battery.
7. An automobile comprising a memory, a processor, and a hybrid vehicle battery heating program stored on the memory and operable on the processor, wherein: the hybrid vehicle battery heating program when executed by the processor implements the steps of the hybrid vehicle battery heating method according to any one of claims 1 to 6.
8. A computer-readable storage medium, wherein a hybrid vehicle battery heating program is stored thereon, which when executed by a processor implements the steps of the hybrid vehicle battery heating method according to any one of claims 1 to 6.
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