CN113782871B - Hybrid vehicle type battery heating control method and system - Google Patents
Hybrid vehicle type battery heating control method and system Download PDFInfo
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- CN113782871B CN113782871B CN202111077269.6A CN202111077269A CN113782871B CN 113782871 B CN113782871 B CN 113782871B CN 202111077269 A CN202111077269 A CN 202111077269A CN 113782871 B CN113782871 B CN 113782871B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/655—Solid structures for heat exchange or heat conduction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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- 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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- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses a heating control method and a system for a hybrid vehicle type battery, wherein the method comprises the following steps: judging whether the temperature of the high-voltage battery is lower than a preset temperature threshold value or not; if yes, starting the engine and entering a battery heating state; after entering a battery heating state, judging whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value; if yes, the engine is shut down, the PTC water heater is kept in a working state, and the high-voltage battery discharges electricity to the PTC water heater; if not, starting the engine, and charging the high-voltage battery through the generator while meeting the requirement of the PTC water heater to work; and if the temperature of the high-voltage battery is higher than or equal to the preset temperature threshold, the PTC water heater is closed, and the battery heating state is exited. The invention provides a heating control method of a hybrid vehicle type battery, which utilizes a PTC water heater as an external heating source of the battery to conduct and heat a battery core and utilizes the internal resistance of the battery core to charge and discharge for self-heating.
Description
Technical Field
The invention relates to the technical field of power batteries of electric hybrid vehicles, in particular to a hybrid vehicle type battery heating control method and system.
Background
With the adoption of the hybrid vehicle type as an intermediate product between the traditional fuel vehicle type and the pure electric vehicle type, the hybrid vehicle type can provide larger endurance mileage, does not have the endurance anxiety problem of the pure electric vehicle type, can realize larger energy-saving performance, and is a development direction in a period of time in the future. The electric quantity of a high-voltage battery of a hybrid vehicle type is small, the power required by a vehicle type driving motor is provided through a large discharge rate, the discharge power of the battery is sensitive to the temperature, the discharge power of the battery is sharply reduced at low temperature, and the discharge power can be reduced to be less than 10% of the maximum dischargeable power at the temperature of minus 30 ℃. When the hybrid vehicle is in a series mode, the engine works to drive the generator to generate power and then drive the motor to work, and after the dischargeable power of the battery is seriously reduced, the power of the driving motor can be limited before the temperature of the battery is restored to a proper temperature, so that the vehicle performance is influenced. In China, the temperature difference between the north and the south is large in winter, so that vehicle types applicable to China need to be developed, a high-voltage battery heating loop needs to be added, and the battery is expected to be heated to a proper temperature in a short time.
Therefore, a hybrid vehicle battery heating control method and system are needed.
Disclosure of Invention
The invention aims to provide a heating control method and a heating control system for a hybrid vehicle type battery, which are used for solving the problems in the prior art and can perform conduction heating on a battery cell by using a PTC (positive temperature coefficient) water heater as an external heating source of the battery and perform self-heating by using internal resistance charging and discharging of the battery cell.
The invention provides a heating control method for a hybrid vehicle type battery, which comprises the following steps:
judging whether the temperature of the high-voltage battery is lower than a preset temperature threshold value or not;
if the temperature of the high-voltage battery is lower than a preset temperature threshold value, starting the engine and entering a battery heating state;
after entering a battery heating state, judging whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value;
if the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value, the engine is shut down, the PTC water heater is kept in a working state, and the high-voltage battery discharges electricity to the PTC water heater;
if the charge capacity of the high-voltage battery is lower than or equal to a preset charge capacity threshold value, starting the engine, and charging the high-voltage battery through the generator while meeting the requirement of the PTC water heater to work;
and if the temperature of the high-voltage battery is higher than or equal to the preset temperature threshold, the PTC water heater is closed, and the battery heating state is exited.
The method for controlling heating of a hybrid vehicle battery as described above, wherein preferably, the determining whether the temperature of the high-voltage battery is lower than a preset temperature threshold specifically includes:
acquiring the temperature of the high-voltage battery through a battery management unit to obtain battery temperature information;
the battery management unit feeds back the battery temperature information to the hybrid controller;
and the hybrid controller judges whether the temperature of the high-voltage battery is lower than a preset temperature threshold value according to the battery temperature information fed back by the battery management unit.
The method for controlling heating of a hybrid vehicle battery as described above, wherein preferably, if the temperature of the high-voltage battery is lower than a preset temperature threshold, starting the engine to enter the battery heating state, specifically includes:
when the temperature of the high-voltage battery is lower than a preset temperature threshold value, the hybrid controller controls the engine to start, and the battery enters a heating state.
The method for controlling heating of a hybrid vehicle battery as described above, wherein preferably, after entering the battery heating state, determining whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold specifically includes:
acquiring the charge capacity of the high-voltage battery through a battery management unit to obtain battery electric quantity information;
the battery management unit feeds back the battery electric quantity information to the hybrid controller;
and the hybrid controller judges whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value according to the battery electric quantity information fed back by the battery management unit.
The method for controlling heating of a hybrid vehicle battery as described above, wherein preferably, if the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold, the engine is turned off, the PTC water heater is kept in an operating state, and the high-voltage battery discharges electricity to the PTC water heater, specifically comprising:
when the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value, the hybrid controller controls the engine to stop, and the PTC water heater continues to supply energy to provide heat energy for the high-voltage battery; meanwhile, the high-voltage battery supplies required electric energy to the PTC water heater, the high-voltage battery discharges, and the discharge current of the high-voltage battery generates heat under the action of the internal resistance.
The heating control method for the hybrid vehicle-type battery as described above, wherein preferably, if the charge capacity of the high-voltage battery is lower than or equal to the preset charge capacity threshold, the engine is started, and the high-voltage battery is charged by the generator while the PTC water heater is operated, specifically comprising:
when the charge capacity of the high-voltage battery is lower than or equal to a preset charge capacity threshold value, starting the engine through the hybrid controller;
the generator is driven by the engine to generate electricity, so that the generator provides electric energy for the PTC water heater, and the PTC water heater provides heat energy for the high-voltage battery; meanwhile, the high-voltage battery is charged through the generator, and in the charging process, the charging current of the high-voltage battery generates heat under the action of the internal resistance.
The method for controlling heating of a hybrid vehicle battery as described above, wherein preferably, if the temperature of the high-voltage battery is higher than or equal to a preset temperature threshold, the PTC water heater is turned off, and the battery heating state is exited, specifically comprising:
and when the temperature of the high-voltage battery is higher than or equal to the preset temperature threshold, the PTC water heater is turned off through the hybrid controller, so that the PTC water heater stops providing heat energy for the high-voltage battery, and the battery heating state is exited.
The invention also provides a hybrid vehicle type battery heating control system adopting the method, which comprises the following steps:
hybrid controller, engine, generator, high voltage battery and PTC water heater, hybrid controller with the engine the generator the high voltage battery with PTC water heater connects, the engine with the generator is connected, the generator with the high voltage battery with PTC water heater connects, wherein:
the hybrid controller is used for controlling the working state of the engine, and/or the generator, and/or the high-voltage battery and/or the PTC water heater;
the engine is used for driving the generator to generate electricity so as to generate electric energy;
the generator is used for providing electric energy for the PTC water heater and charging the high-voltage battery;
the PTC water heater is used for providing heat energy for the high-voltage battery;
the high-voltage battery is used for providing electric energy required by work for the PTC water heater, and generates heat under the action of internal resistance in the discharging process to provide heat energy for the high-voltage battery.
The hybrid vehicle type battery heating control system as described above, wherein preferably, the hybrid vehicle type battery heating control system further includes a battery management unit provided in the high voltage battery for collecting a temperature and/or a charge capacity of the high voltage battery.
The hybrid vehicle type battery heating control system as described above, wherein it is preferable that the hybrid vehicle type battery heating control system further includes a high voltage distribution box connected to the hybrid controller, the high voltage battery, and the PTC water heater for distributing the high voltage electricity between the high voltage battery and the PTC water heater.
According to the heating control method and the heating control system for the hybrid vehicle type battery, the PTC water heater is used as the external heating source of the battery to conduct and heat the battery core, and meanwhile, the self-heating is carried out by utilizing the internal resistance of the battery core to charge and discharge; in the starting stage of the engine, the high-voltage load of the whole vehicle increases the charging load of a high-voltage battery besides the PTC water heater, so that the output power of the generator and the engine is increased, and the conversion efficiency from fuel oil to electric energy is further improved; and fuel is not consumed in the engine stop stage, and the fuel economy is improved compared with the condition that the engine always works in a low-load state.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
fig. 1 is a flowchart of an embodiment of a hybrid vehicle battery heating control method according to the present invention;
fig. 2 is a block diagram of a hybrid vehicle battery heating control system according to an embodiment of the present invention.
Description of the reference numerals:
1-hybrid controller 2-engine 3-generator
4-high voltage battery 5-PTC water heater 6-battery management unit
7-high voltage distribution box 8-battery cooling heat exchanger 9-circulating water pump
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not restrictive, unless specifically stated otherwise.
As used in this disclosure, "first", "second": and the like, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be intervening components between the specific component and the first component or the second component. When it is described that a specific component is connected to other components, the specific component may be directly connected to the other components without having an intervening component, or may be directly connected to the other components without having an intervening component.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, systems and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
At present, the engine is started, the generator is continuously in a power generation state, and electric energy is provided for the PTC water heater to heat the battery. When the PTC water heater is used for heating, the engine is started to drive the generator to generate electricity, the PTC water heater heats circulating water of the battery, and the heat transfer of the circulating water is used for heating the battery. In the heating process, the generator is continuously in a power generation state, after the battery is fully charged, the high-voltage electric load of the vehicle only has the PTC water heater, the high-voltage load power of the whole vehicle is low, the output power of the generator is small, the power generation efficiency is reduced, meanwhile, the load of the engine is low, the fuel consumption is high, and the conversion efficiency from fuel to electric energy is low. The heating mode of the battery only depends on the heat transfer of the circulating water, the hot rate is slow, and the heating time is long.
As shown in fig. 1, in the actual implementation process, the method for controlling heating of a hybrid vehicle battery provided in this embodiment specifically includes:
step S1, judging whether the temperature of the high-voltage battery is lower than a preset temperature threshold value or not.
In an embodiment of the hybrid vehicle battery heating control method according to the present invention, the step S1 may specifically include:
and S11, acquiring the temperature of the high-voltage battery through a battery management unit to obtain battery temperature information.
And S12, the battery management unit feeds back the battery temperature information to the hybrid controller.
And S13, the hybrid controller judges whether the temperature of the high-voltage battery is lower than a preset temperature threshold value according to the battery temperature information fed back by the battery management unit.
And S2, if the temperature of the high-voltage battery is lower than a preset temperature threshold, starting the engine and entering a battery heating state.
Specifically, when the temperature of the high-voltage battery is lower than a preset temperature threshold value, the hybrid controller controls the engine to start, and the battery is heated.
And S3, after the battery is heated, judging whether the Charge capacity (SOC) Of the high-voltage battery is higher than a preset Charge capacity threshold value.
In an embodiment of the hybrid vehicle battery heating control method according to the present invention, the step S3 may specifically include:
and S31, acquiring the charge capacity of the high-voltage battery through a battery management unit to obtain battery electric quantity information.
And step S32, the battery management unit feeds back the battery power information to the hybrid controller.
And step S33, the hybrid controller judges whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value according to the battery electric quantity information fed back by the battery management unit.
And S4, if the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value, the engine is turned off, the PTC water heater is kept in a working state, and the high-voltage battery discharges electricity to the PTC water heater.
Specifically, when the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value, the hybrid controller controls the engine to stop, and at the moment, the PTC water heater continues to supply energy to provide heat energy for the high-voltage battery; meanwhile, the high-voltage battery supplies required electric energy to the PTC water heater, the high-voltage battery discharges, and the discharge current of the high-voltage battery generates heat under the action of the internal resistance.
And S5, if the charge capacity of the high-voltage battery is lower than or equal to a preset charge capacity threshold value, starting the engine, and charging the high-voltage battery through the generator while the PTC water heater works.
In an embodiment of the hybrid vehicle battery heating control method according to the present invention, the step S5 may specifically include:
and S51, starting the engine through the hybrid controller when the charge capacity of the high-voltage battery is lower than or equal to a preset charge capacity threshold value.
Step S52, driving a generator to generate electricity through an engine so that the generator provides electric energy for the PTC water heater and the PTC water heater provides heat energy for the high-voltage battery; meanwhile, the high-voltage battery is charged through the generator, and in the charging process, the charging current of the high-voltage battery generates heat under the action of the internal resistance.
In specific implementation, the engine controls the output power of the generator according to the acceptable charging power of the battery and the power of the PTC water heater fed back by the battery management unit, so that the PTC water heater works and the requirement for charging the high-voltage battery is met.
Therefore, when the charge capacity of the high-voltage battery is higher than the preset charge capacity threshold, the step S4 is executed, when the charge capacity of the high-voltage battery is lower than or equal to the preset charge capacity threshold, the step S5 is executed, the operation states of the engine, the PTC water heater and the high-voltage battery are dynamically adjusted according to the charge capacity of the high-voltage battery repeatedly, the PTC water heater conducts and heats the battery cell by using a heating source PTC water heater outside the battery, meanwhile, self-heating is carried out by using internal resistance of the battery cell to charge and discharge, the high-voltage battery is in a charge and discharge cycle state, current passes through the high-voltage battery, heating can be carried out by using an internal resistance heating principle, the PTC water heater is also in the operation state, the battery is heated by heat conduction, and replacement heating can be realized by using two heat sources inside and outside the battery.
And S6, if the temperature of the high-voltage battery is higher than or equal to a preset temperature threshold, closing the PTC water heater and exiting the battery heating state.
Specifically, when the temperature of the high-voltage battery is higher than or equal to a preset temperature threshold value, the PTC water heater is turned off through the hybrid controller, so that the PTC water heater stops providing heat energy for the high-voltage battery, and the battery heating state is exited.
According to the heating control method of the hybrid vehicle type battery provided by the embodiment of the invention, the PTC water heater is used as an external heating source of the battery to conduct and heat the battery core, and meanwhile, the self-heating is carried out by utilizing the internal resistance of the battery core to charge and discharge; in the starting stage of the engine, the high-voltage load of the whole vehicle is added with the charging load of the high-voltage battery besides the PTC water heater, so that the output power of the generator and the engine is increased, and the conversion efficiency from fuel oil to electric energy is further improved; and fuel is not consumed in the stop stage of the engine, and compared with the condition that the engine always works in a low-load state, the fuel economy is improved.
As shown in fig. 2, the hybrid vehicle-type battery heating control system according to the present embodiment includes: a Hybrid Control Unit (HCU) 1, an engine 2, a generator 3, a high voltage battery 4, and a PTC water heater 5, wherein the Hybrid Control Unit 1 is connected to the engine 2, the generator 3, the high voltage battery 4, and the PTC water heater 5, the engine 2 is connected to the generator 3, and the generator 3 is connected to the high voltage battery 4 and the PTC water heater 5, wherein:
the hybrid controller 1 is used for controlling the working state of the engine 2, and/or the generator 3, and/or the high-voltage battery 4 and/or the PTC water heater 5;
the engine 2 is used for driving the generator 3 to generate electricity so as to generate electric energy;
the generator 3 is used for providing electric energy for the PTC water heater 5 and charging the high-voltage battery 4;
the PTC water heater 5 is used to provide heat energy to the high voltage battery 4;
the high-voltage battery 4 is used for providing electric energy required by the work for the PTC water heater 5, and heating under the action of internal resistance in the discharging process to provide heat energy for the high-voltage battery 4.
The engine 2 and the generator 3 are mechanically connected, for example, by a gearbox.
Further, the hybrid vehicle type Battery heating control system further includes a Battery Management System (BMS) 6 provided in the high voltage Battery 4 for collecting a temperature and/or a charge capacity of the high voltage Battery 4.
The hybrid vehicle type battery heating control system further comprises a high-voltage distribution box 7 connected with the hybrid controller 1, the high-voltage battery 4 and the PTC water heater 5 and used for distributing high-voltage electricity between the high-voltage battery 4 and the PTC water heater 5. Specifically, the high voltage distribution box 7 and the generator 3, the high voltage distribution box 7 and the high voltage battery 4, and the high voltage distribution box 7 and the PTC water heater 5 are connected by high voltage circuits.
Further, the hybrid vehicle type battery heating control system further includes a battery cooling heat exchanger 8 disposed between the high-voltage battery 4 and the PTC water heater 5 for exchanging heat between the high-voltage battery 4 and the PTC water heater 5 to cool the high-voltage battery 4.
The hybrid vehicle type battery heating control system further comprises a circulating water pump 9 which is arranged between the high-voltage battery 4 and the battery cooling heat exchanger 8 and used for driving circulating water to circulate between the high-voltage battery 4 and the PTC heater 5 and between the PTC heater 5 and the battery cooling heat exchanger 8 through a battery heating water path.
According to the hybrid vehicle type battery heating control system provided by the embodiment of the invention, the PTC water heater is used as the external heating source of the battery to conduct and heat the battery core, and meanwhile, the battery core is self-heated by charging and discharging through the internal resistance of the battery core; in the starting stage of the engine, the high-voltage load of the whole vehicle is added with the charging load of the high-voltage battery besides the PTC water heater, so that the output power of the generator and the engine is increased, and the conversion efficiency from fuel oil to electric energy is further improved; and fuel is not consumed in the engine stop stage, and the fuel economy is improved compared with the condition that the engine always works in a low-load state.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (6)
1. A hybrid vehicle type battery heating control method is characterized by comprising the following steps:
judging whether the temperature of the high-voltage battery is lower than a preset temperature threshold value or not;
if the temperature of the high-voltage battery is lower than a preset temperature threshold value, controlling the engine to start through the hybrid controller, and entering a battery heating state;
after entering a battery heating state, judging whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value;
if the charge capacity of the high-voltage battery is higher than the preset charge capacity threshold, the engine is shut down, the PTC water heater is kept in a working state, and the high-voltage battery discharges electricity to the PTC water heater, and the method specifically comprises the following steps: when the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value, the hybrid controller controls the engine to stop, and the PTC water heater continues to supply energy to provide heat energy for the high-voltage battery; meanwhile, the high-voltage battery provides required electric energy for the PTC water heater, the high-voltage battery discharges, and the discharge current of the high-voltage battery generates heat under the action of internal resistance;
if the charge capacity of the high-voltage battery is lower than or equal to the preset charge capacity threshold, the engine is started through the hybrid controller, and the high-voltage battery is charged through the generator while the PTC water heater works, and the method specifically comprises the following steps: the generator is driven by the engine to generate electricity, so that the generator provides electric energy for the PTC water heater, and the PTC water heater provides heat energy for the high-voltage battery; meanwhile, the high-voltage battery is charged through the generator, and in the charging process, the charging current of the high-voltage battery generates heat under the action of the internal resistance;
if the temperature of the high-voltage battery is higher than or equal to the preset temperature threshold value, the PTC water heater is turned off through the hybrid controller, so that the PTC water heater stops providing heat energy for the high-voltage battery, and the battery heating state is exited.
2. The hybrid vehicle-type battery heating control method according to claim 1, wherein the determining whether the temperature of the high-voltage battery is lower than a preset temperature threshold specifically comprises:
acquiring the temperature of the high-voltage battery through a battery management unit to obtain battery temperature information;
the battery management unit feeds back the battery temperature information to the hybrid controller;
and the hybrid controller judges whether the temperature of the high-voltage battery is lower than a preset temperature threshold value according to the battery temperature information fed back by the battery management unit.
3. The hybrid vehicle-type battery heating control method according to claim 1, wherein the determining whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold after entering the battery heating state specifically comprises:
acquiring the charge capacity of the high-voltage battery through a battery management unit to obtain battery electric quantity information;
the battery management unit feeds back the battery electric quantity information to the hybrid controller;
and the hybrid controller judges whether the charge capacity of the high-voltage battery is higher than a preset charge capacity threshold value or not according to the battery electric quantity information fed back by the battery management unit.
4. A hybrid vehicle battery heating control system employing the method of any one of claims 1-3, comprising: hybrid controller, engine, generator, high voltage battery and PTC water heater, hybrid controller with the engine the generator the high voltage battery with PTC water heater connects, the engine with the generator is connected, the generator with the high voltage battery with PTC water heater connects, wherein:
the hybrid controller is used for controlling the working state of the engine, and/or the generator, and/or the high-voltage battery and/or the PTC water heater;
the engine is used for driving the generator to generate electricity so as to generate electric energy;
the generator is used for providing electric energy for the PTC water heater and charging the high-voltage battery;
the PTC water heater is used for providing heat energy for the high-voltage battery;
the high-voltage battery is used for providing electric energy required by work for the PTC water heater, and generates heat under the action of internal resistance in the discharging process to provide heat energy for the high-voltage battery.
5. The hybrid vehicle-type battery heating control system according to claim 4, further comprising a battery management unit provided in the high-voltage battery for collecting a temperature and/or a charge capacity of the high-voltage battery.
6. The hybrid vehicle type battery heating control system according to claim 4, further comprising a high voltage distribution box connected to the hybrid controller, the high voltage battery and the PTC water heater for distribution of high voltage electricity between the high voltage battery and the PTC water heater.
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