CN112060976A - Heating method and device for vehicle power battery and vehicle - Google Patents

Heating method and device for vehicle power battery and vehicle Download PDF

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Publication number
CN112060976A
CN112060976A CN202010975421.1A CN202010975421A CN112060976A CN 112060976 A CN112060976 A CN 112060976A CN 202010975421 A CN202010975421 A CN 202010975421A CN 112060976 A CN112060976 A CN 112060976A
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temperature
vehicle
power battery
ptc
vehicle power
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CN112060976B (en
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刘一鸣
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • 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
    • 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 embodiment of the invention provides a heating method and device for a vehicle power battery and a vehicle, wherein the method comprises the following steps: acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit; determining target heating power corresponding to a Positive Temperature Coefficient (PTC) component according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit; controlling the positive temperature coefficient component PTC to heat the vehicle power battery through the heat conducting unit by the target heating power; in addition, the heating power of the PTC can be adaptively adjusted according to factors influencing the heat absorption of the vehicle power battery in the heating process of the vehicle power battery; therefore, at least one of the problems of insufficient heating capacity, thermal shock, frequent startup and shutdown of the PTC and the like caused by heating in a PTC heating mode in the prior art is solved.

Description

Heating method and device for vehicle power battery and vehicle
Technical Field
The invention relates to the technical field of automobiles, in particular to a heating method and device for a vehicle power battery and a vehicle.
Background
The electric automobile is used as a green vehicle with wide development prospect, and the popularization speed is extremely rapid. One of the key factors influencing the development of electric vehicles is a power battery, most of the electric vehicles adopt a lithium ion battery as a power supply device, and the lithium ion power battery has poor charging and discharging characteristics due to large polarization under a low-temperature environment; therefore, when the temperature of the power battery is low, the power battery needs to be heated to ensure normal charging and discharging of the lithium ion battery.
Among them, PTC (positive temperature coefficient) is generally used for heating a power battery of a vehicle due to advantages of constant temperature heating, no open fire, long service life, and the like.
In the prior art, the PTC heating method includes various methods, such as heating the PTC at a constant fixed power, and stopping the heating of the PTC after the target battery temperature is reached; for another example, the PTC is heated at a certain fixed power, and stops heating after reaching the target battery temperature; for example, the PTC heating power varies with the battery temperature, and the PTC stops heating after the target battery temperature is reached.
However, whatever PTC heating method of the prior art is adopted, the following defects exist: (1) insufficient heating capacity, and thus the battery cannot be heated to a desired target temperature all the time; (2) overheating causes the power battery to have frequent thermal shock, and the service life of the battery is influenced; and frequent start and stop of the PTC, affecting the PTC life, etc.
Disclosure of Invention
The embodiment of the invention provides a heating method of a vehicle power battery, which is used for solving at least one of the problems of insufficient heating capacity, thermal shock, frequent start and stop of a PTC (positive temperature coefficient) and the like caused by heating according to a PTC heating mode in the prior art by adaptively adjusting the PTC heating power.
The embodiment of the invention also provides a heating device of the vehicle power battery and a vehicle, so as to ensure the implementation of the method.
In order to solve the above problems, the present invention discloses a method for heating a vehicle power battery, comprising: acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit; determining target heating power corresponding to a Positive Temperature Coefficient (PTC) component according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit; and controlling the PTC to heat the vehicle power battery through the heat conducting unit by the target heating power.
Optionally, the determining, according to the current temperature of the vehicle power battery, the current temperature of the vehicle external environment, and the current temperature of the heat conducting unit, the target heating power corresponding to the positive temperature coefficient device PTC includes: determining a first temperature difference between a current temperature of the vehicle power battery and a current temperature of an environment external to the vehicle; determining a second temperature difference value between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit; and determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
Optionally, the determining the target heating power corresponding to the positive temperature coefficient device PTC according to the first temperature difference and the second temperature difference includes: acquiring a pre-established mapping relation, wherein the mapping relation comprises a relation among a first preset temperature difference value, a second preset temperature difference value and a preset heating power of a Positive Temperature Coefficient (PTC) component; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit; and searching the pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining the target heating power corresponding to the positive temperature coefficient component PTC.
Optionally, the method further comprises: acquiring relation information among heat generated by heating the positive temperature coefficient component PTC, heat absorbed by the heat conduction unit, heat absorbed by the vehicle power battery and heat absorbed by the external environment of the vehicle; the heat generated by the PTC heating is determined according to the heating power of the PTC, the heat absorbed by the vehicle external environment is determined according to the difference value between the temperature of the vehicle power battery and the temperature of the vehicle external environment, the heat absorbed by the vehicle power battery is determined according to the temperature of the vehicle power battery, and the heat absorbed by the heat conduction unit is determined according to the temperature of the heat conduction unit; and establishing a mapping relation according to the relation information.
Optionally, the establishing a mapping relationship according to the relationship information includes: acquiring a thermal shock reference temperature of the vehicle power battery, wherein the thermal shock reference temperature is a difference value between the temperature of the vehicle power battery and the temperature of the heat conducting unit when the vehicle power battery has thermal shock; setting a plurality of temperature difference conditions and preset heating power of the PTC under each temperature difference condition according to the relationship information and the thermal shock reference temperature to obtain the mapping relationship; wherein the temperature difference condition includes: a first predetermined temperature difference and a second predetermined temperature difference.
The embodiment of the invention also discloses a heating device of the vehicle power battery, which comprises: the temperature acquisition module is used for acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit; the determining module is used for determining target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit; and the control module is used for controlling the PTC element to heat the vehicle power battery through the heat conducting unit with the target heating power.
Optionally, the determining module includes: a first temperature difference determination submodule for determining a first temperature difference between a current temperature of the vehicle power battery and a current temperature of an environment outside the vehicle; the second temperature difference determination submodule is used for determining a second temperature difference value between the current temperature of the vehicle power battery and the current temperature of the heat conduction unit; and the power determination submodule is used for determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
Optionally, the power determining submodule is configured to obtain a pre-established mapping relationship, where the mapping relationship includes a relationship between a first preset temperature difference value, a second preset temperature difference value, and a preset heating power of a positive temperature coefficient device PTC; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit; and searching the pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining the target heating power corresponding to the positive temperature coefficient component PTC.
Optionally, the apparatus further comprises: the relation information acquisition module is used for acquiring relation information among heat generated by heating the positive temperature coefficient component PTC, heat absorbed by the heat conduction unit, heat absorbed by the vehicle power battery and heat absorbed by the external environment of the vehicle; the heat generated by the PTC heating is determined according to the heating power of the PTC, the heat absorbed by the vehicle external environment is determined according to the difference value between the temperature of the vehicle power battery and the temperature of the vehicle external environment, the heat absorbed by the vehicle power battery is determined according to the temperature of the vehicle power battery, and the heat absorbed by the heat conduction unit is determined according to the temperature of the heat conduction unit; and the relationship establishing module is used for establishing a mapping relationship according to the relationship information.
Optionally, the relationship establishing module is configured to obtain a thermal shock reference temperature of the vehicle power battery, where the thermal shock reference temperature is a difference between a temperature of the vehicle power battery and a temperature of the heat conducting unit when the vehicle power battery has thermal shock; setting a plurality of temperature difference conditions and preset heating power of the PTC under each temperature difference condition according to the relationship information and the thermal shock reference temperature to obtain the mapping relationship; wherein the temperature difference condition includes: a first predetermined temperature difference and a second predetermined temperature difference.
Embodiments also provide a vehicle comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory, and the one or more programs configured to be executed by the one or more processors include a method for performing heating of a vehicle power battery as described in any of the above.
Embodiments of the present invention also provide a readable storage medium, where instructions, when executed by a processor of an electronic device, enable the electronic device to perform any one of the above-described heating methods for a vehicle power battery.
Compared with the prior art, the embodiment of the invention has the following advantages:
in the embodiment of the invention, in the heating process of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit can be obtained; then determining target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit, and controlling the positive temperature coefficient component PTC to heat the vehicle power battery through the heat conduction unit by using the target heating power; in addition, the heating power of the PTC can be adaptively adjusted according to factors influencing the heat absorption of the vehicle power battery in the heating process of the vehicle power battery; therefore, at least one of the problems of insufficient heating capacity, thermal shock, frequent startup and shutdown of the PTC and the like caused by heating in a PTC heating mode in the prior art is solved.
Drawings
FIG. 1 is a block diagram of an embodiment of a heating system for a vehicle power battery of the present invention;
FIG. 2 is a flow chart illustrating steps of an embodiment of a method for heating a power battery of a vehicle according to the present invention;
FIG. 3a is a flowchart illustrating steps of a method for establishing a mapping relationship according to an embodiment of the present invention;
FIG. 3b is a schematic diagram of heat transfer during heating of a vehicle power cell by a PTC in accordance with an embodiment of the present invention;
FIG. 3c is a schematic temperature profile of a PTC heating process according to an embodiment of the invention;
FIG. 4 is a flowchart illustrating steps of yet another embodiment of a method for heating a vehicle power battery in accordance with the present invention;
FIG. 5 is a block diagram of an embodiment of a heating device for a vehicle power battery according to the present invention;
fig. 6 is a block diagram of an alternative apparatus for heating a vehicle power battery according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
According to the heating method of the vehicle power battery provided by the embodiment of the invention, the PTC heating power can be adaptively adjusted according to factors influencing the heat absorption of the vehicle power battery, so that at least one of the problems of insufficient heating capacity, thermal shock, frequent starting and stopping of the PTC and the like caused by heating according to the PTC heating mode in the prior art is solved.
Referring now to fig. 1, a block diagram of an embodiment of a heating system for a vehicle power battery of the present invention is shown. The heating system of the vehicle power battery may include a PTC, a heat conducting unit, and a vehicle power battery. The heat conducting unit is used for heat conduction; after the PTC is started, the heat of the PTC can be conducted to the vehicle power battery through the heat conducting unit, so that the PTC is adopted to heat the vehicle power battery. In one example, the heat conducting unit may be a cooling water path, which may heat or dissipate heat for the vehicle power battery.
A method for heating a vehicle power battery according to an embodiment of the present invention will be described with reference to fig. 1.
Referring to fig. 2, a flow chart of steps of an embodiment of a method of heating a vehicle power cell of the present invention is shown.
Step 202, acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit.
And 204, determining target heating power corresponding to the Positive Temperature Coefficient (PTC) component according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit.
And step 206, controlling the positive temperature coefficient element PTC, and heating the vehicle power battery through the heat conducting unit by using the target heating power.
Because the charging and discharging characteristics of the vehicle power battery are poor in the low-temperature environment, the vehicle power battery can be heated in the low-temperature environment, so that the vehicle power battery can recover the normal charging characteristics, and the normal use of a user on the vehicle is ensured.
In the embodiment of the invention, the PTC can be adopted to heat the power battery of the vehicle. In the prior art, the PTC is heated in a constant fixed power heating mode, or in a mode that the PTC is heated in a certain fixed power, or in a mode that the PTC heating power is changed along with the temperature of the battery, the situation of insufficient heating capacity or overheating can exist; therefore, in the embodiment of the invention, factors influencing the heat absorption of the power battery of the vehicle can be analyzed in the process of adopting PTC heating; the heating power of the PTC is then determined based on factors that affect the heat absorption of the vehicle power cell. Then controlling the PTC to heat according to the heating power to realize the self-adaptive adjustment of the PTC heating power; therefore, at least one of the problems of insufficient heating capacity, thermal shock, frequent startup and shutdown of the PTC and the like caused by heating in a PTC heating mode in the prior art is solved.
In the embodiment of the invention, after the PTC is started, the vehicle power battery can exchange heat with the heat conducting unit and also exchange heat with the external environment of the vehicle; correspondingly, various factors that affect the heat absorption of the vehicle power battery may include at least: the temperature of the heat conducting unit, the temperature of the environment outside the vehicle, and the temperature of the vehicle power battery itself. Therefore, the embodiment of the invention can acquire the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit in the current state. And then determining the target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit.
The vehicle power battery can be composed of a plurality of single batteries; the temperature of the vehicle power battery may refer to an average temperature of each battery cell in the vehicle power battery, or may be a temperature of a battery cell with a lowest temperature in the vehicle power battery; the embodiments of the present invention are not limited in this regard.
The embodiment of the invention can pre-establish the mapping relation among the temperature of the vehicle power battery, the temperature of the external environment of the vehicle, the temperature of the heat conducting unit and the heating power of the PTC; and then, based on the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit, searching a pre-established mapping relation and determining the target heating power corresponding to the PTC.
In the embodiment of the invention, after the target heating power of the PTC is determined, if the current heating power of the PTC is different from the target heating power, the PTC power can be switched from the current heating power to the target heating power. And then the heat generated by the heating of the PTC can be conducted to the power battery of the vehicle through the heat conduction unit, so that the PTC is controlled to heat the power battery of the vehicle at the target heating power.
In summary, in the embodiment of the present invention, during the heating process of the vehicle power battery, the current temperature of the external environment of the vehicle, and the current temperature of the heat conducting unit may be obtained; then determining target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit, controlling the positive temperature coefficient component PTC, and heating the vehicle power battery through the heat conduction unit by using the target heating power; in addition, the heating power of the PTC can be adaptively adjusted according to factors influencing the heat absorption of the vehicle power battery in the heating process of the vehicle power battery; therefore, at least one of the problems of insufficient heating capacity, thermal shock, frequent startup and shutdown of the PTC and the like caused by heating in a PTC heating mode in the prior art is solved.
How to establish the mapping relationship is explained below.
Referring to fig. 3a, a flowchart illustrating steps of an embodiment of a mapping relationship establishing method of the present invention is shown.
Step 302, obtaining the relation information between the heat generated by the PTC heating, the heat absorbed by the heat conducting unit, the heat absorbed by the vehicle power battery and the heat absorbed by the external environment of the vehicle; the heat generated by heating the PTC element is determined according to the heating power of the PTC, the heat absorbed by the external environment of the vehicle is determined according to the difference between the temperature of the power battery of the vehicle and the temperature of the external environment of the vehicle, the heat absorbed by the power battery of the vehicle is determined according to the temperature of the power battery of the vehicle, and the heat absorbed by the heat conducting unit is determined according to the temperature of the heat conducting unit.
In the embodiment of the invention, the relationship information among the heat generated by the PTC heating, the heat absorbed by the heat conducting unit, the heat absorbed by the vehicle power battery and the heat absorbed by the external environment of the vehicle can be established according to the law of energy conservation.
Referring to fig. 3b, a schematic diagram of heat conduction during the process of heating the power battery of the vehicle by the PTC according to the embodiment of the present invention is shown; wherein:
q1 represents the amount of heat exchanged between the PTC and the thermally conductive unit, and may be in units of J;
q2 represents the amount of heat exchanged between the thermally conductive unit and the vehicle power battery, and may be in units of J;
q3 represents the heat exchanged between the vehicle power cell and the environment external to the vehicle, and may be in units of J;
h2 represents the heat transfer coefficient per unit area between the heat transfer unit and the vehicle power cell, which may be in units of J/(° C m ^ 2);
h3 represents the coefficient of heat transfer per unit area between the vehicle power cell and the environment external to the vehicle, which may be in units of J/(° C m ^ 2);
tc represents the temperature of the heat conducting unit, and can be expressed in units of ℃;
tb represents the temperature of the vehicle power battery and can be in units of;
te represents the temperature of the environment outside the vehicle and may be in units of ℃.
Referring to fig. 3c, a schematic diagram of a temperature profile during heating of a PTC of an embodiment of the present invention is shown. In fig. 3c, a temperature curve Te of the environment outside the vehicle, a temperature curve Tb of the vehicle power battery and a temperature curve Tc of the heat conducting unit are shown. Wherein, in the heating time length of delta t, the temperature of the heat conduction unit is increased from Tc1 to Tc2, and the difference value of the two is delta Tc; the temperature of the vehicle power battery is increased from Tb1 to Tb2, the difference between the two is delta Tb, and the temperature of the environment outside the vehicle is converted from Te1 to Te 2.
Wherein the difference between the heat exchanged between the PTC and the heat conducting unit and the heat exchanged between the heat conducting unit and the vehicle power battery is substantially the heat absorbed by the heat conducting unit; can be expressed by the following formula:
Q1-Q2＝Cc*Mc*ΔTc (1)
wherein, Cc*Mc(Tc2-Tc1) denotes the heat absorbed by the heat-conducting unit, McIs the mass of the heat-conducting unit, CcΔ T being the specific heat capacity of the heat-conducting unitcIs the difference between the temperature of the heat conducting unit at the beginning of heating and the temperature at the end of heating.
According to the law of conservation of energy, the difference between the energy generated by the PTC heating and the heat conducted by the heat conducting unit to the vehicle power battery is equal to the heat absorbed by the heat conducting unit. The heat generated by the PTC heating can be determined according to the heating power of the PTC, and the heat absorbed by the heat conducting unit can be determined according to the temperature of the heat conducting unit; can be expressed by the following formula:
Pptc*Δt-h2*(Tc-Tb)*Δt＝Cc*Mc*(Tc2-Tc2) (2)
wherein, PptcIn the case of the heating power of the PTC, Δ t is the heating time period of the PTC. h is2And (Tc-Tb) Δ t is the heat conducted by the heat conducting unit to the vehicle power battery, and Tc-Tb is the difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit. Cc*Mc(Tc2-Tc2) is the heat absorbed by the heat conducting unit, and Tc2-Tc1 is the difference between the temperature at the beginning and the temperature at the end of heating of the heat conducting unit.
The difference between the heat exchanged between the heat conducting unit and the vehicle power battery and the heat exchanged between the vehicle power battery and the external environment of the vehicle is substantially the heat absorbed by the vehicle power battery; can be expressed by the following formula:
Q2-Q3＝Cb*Mb*ΔTb (3)
wherein, Cb*MbΔ Tb represents the heat absorbed by the vehicle's power battery, MbMass of the power battery of the vehicle, CcΔ Tb is the difference between the temperature at which heating of the vehicle power battery starts and the temperature at which heating ends, which is the specific heat capacity of the vehicle power battery.
According to the law of conservation of energy, the difference between the heat conducted from the heat conducting unit to the vehicle power battery and the heat conducted from the vehicle power battery to the environment outside the vehicle is equal to the heat absorbed by the vehicle power battery. The amount of heat absorbed by the vehicle power battery is determined according to the temperature of the vehicle power battery, and can be expressed by the following formula:
h2*(Tc-Tb)*Δt-h3*(Tb-Te)*Δt＝Cb*Mb*(Tb2-Tb1) (4)
wherein h is2(Tc-Tb) Δ t is the heat conducted by the heat conducting unit to the vehicle power battery, h3And the power battery of the vehicle conducts heat to the external environment of the vehicle. Δ t is the heating time period of the PTC, Tc-Tb is the difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit, and Tb-Te is the difference between the temperature of the vehicle power battery and the temperature of the environment outside the vehicle. Cb*Mb*(Tb2-Tb1) Tb2-Tb1 is the difference between the temperature at which heating of the vehicle power battery begins and the temperature at which heating ends, and is the amount of heat absorbed by the vehicle power battery.
The formula (3) and the formula (4) are added to obtain the relationship information between the heat generated by the PTC heating, the heat absorbed by the heat conducting unit, the heat absorbed by the vehicle power battery and the heat absorbed by the vehicle external environment, and can be expressed by the following formula:
Pptc*Δt-h3*(Tb-Te)*Δt＝Cc*Mc*(Tc2-Tc1)+Cb*Mb*(Tb2-Tb1) (5)
equation (5) essentially represents: the difference between the heat generated by the PTC heating and the heat absorbed by the environment outside the vehicle is equal to the sum of the heat absorbed by the vehicle power battery and the heat absorbed by the heat conducting unit. Wherein the heat absorbed by the external environment of the vehicle is taken as h3(Tb-Te) Δ t, i.e. the amount of heat absorbed by the environment outside the vehicle is determined by the difference between the temperature of the power battery of the vehicle and the temperature of the environment outside the vehicle.
The relation information comprises the relation among PTC heating power, the temperature of a vehicle power battery, the temperature of the external environment of the vehicle and the temperature of the heat conducting unit; and then, according to the relationship information, a mapping relationship can be established. Wherein, the relationship information can be analyzed; then establishing a mapping relation among the temperature of the vehicle power battery, the temperature of the external environment of the vehicle, the temperature of the heat conducting unit and the heating power of the PTC according to the analysis result; reference may be made to steps 304-306:
and 304, acquiring a thermal shock reference temperature of the vehicle power battery, wherein the thermal shock reference temperature is a difference value between the temperature of the vehicle power battery and the temperature of the heat conducting unit when the vehicle power battery has thermal shock.
And step 306, setting a plurality of temperature difference conditions and the preset heating power of the PTC under each temperature difference condition according to the relationship information and the thermal shock reference temperature to obtain the mapping relationship.
As can be seen from the analysis of the relationship information in the formula (5), the greater the difference between the temperature of the vehicle power battery and the temperature of the environment outside the vehicle, the greater the PTC heating power is required to increase the temperature of the heat conducting unit and the temperature of the vehicle power battery at the same or faster temperature increase rate.
And in the PTC heating process, when the difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit is large, the vehicle power battery can generate a large amount of heat exchange in a short time due to overheating, and the temperature is changed violently, so that thermal shock (thermal shock refers to the phenomenon that an object generates a large amount of heat exchange in a short time, and when the temperature is changed violently, the physical distribution can generate impact thermal stress) occurs. Therefore, when the difference between the temperature of the heat transfer unit and the temperature of the vehicle power battery is larger, the closer to the boundary value of the vehicle power battery where thermal shock occurs, the lower the PTC power can reduce or avoid the thermal shock.
Furthermore, in the embodiment of the invention, a mapping relation can be established by combining the difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit when the vehicle power battery has thermal shock and the difference between the temperature of the vehicle power battery and the temperature of the external environment of the vehicle; so as to avoid thermal shock of the vehicle power battery and improve the PTC heating rate. For convenience of subsequent description, a difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit when the vehicle power battery has thermal shock may be referred to as a thermal shock reference temperature.
In the embodiment of the invention, various temperature difference conditions can be set. Wherein the temperature difference condition may include: a first preset temperature difference value and a second preset temperature difference value; namely, a plurality of groups of first preset temperature difference values and second preset temperature difference values are set, and one group of first preset temperature difference values and one group of second preset temperature difference values are a temperature difference condition. That is, the first preset temperature difference value may refer to a difference value between a preset temperature of the vehicle power battery and a temperature of an environment outside the vehicle when the mapping relationship is established; the second preset temperature difference value may refer to a difference value between a preset temperature of the heat conducting unit and a temperature of the vehicle power battery when the mapping relationship is established. The different temperature difference conditions may be that the first preset temperature difference values are the same, and the second preset temperature difference values are different; or the first preset temperature difference values are different, and the second preset temperature difference values are the same; or the first preset temperature difference values are different, and the second preset temperature difference conditions are different.
And then setting preset heating power of the PTC under various temperature difference conditions based on the analysis result of the relationship information and the thermal shock reference temperature to obtain the mapping relationship. That is to say, the mapping relationship between the temperature of the vehicle power battery, the temperature of the vehicle external environment, the temperature of the heat conducting unit, and the preset heating power of the PTC device may refer to the relationship between the first preset temperature difference, the second preset temperature difference, and the preset heating power of the PTC device. The preset heating power may be a preset heating power of the PTC when the mapping relationship is established.
In one example of the present invention, one of the ideas of setting the preset heating power of the PTC in different temperature difference conditions based on the analysis result of the relationship information and the thermal shock reference temperature to obtain the mapping relationship is that when the difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit is small, the thermal shock risk is small; at this time, when the temperature of the vehicle power battery is different from the temperature difference outside the vehicle, the PTC can be heated with a large heating power to realize rapid temperature rise. When the temperature difference between the temperature of the vehicle power battery and the temperature of the heat conducting unit is large, the thermal shock risk is large, the larger the temperature difference between the temperature of the vehicle power battery and the external environment of the vehicle is (which may mean that the difference obtained by subtracting the temperature difference between the external environment of the vehicle from the temperature of the vehicle power battery is larger), the larger the heating power of the PTC is. The smaller the difference between the temperature of the vehicle power battery and the temperature outside the vehicle (which may mean that the difference obtained by subtracting the temperature difference outside the vehicle from the temperature of the vehicle power battery is smaller), the smaller the heating power of the PTC may be.
As shown in table 1, a schematic diagram of a mapping relationship is shown in table 1.
-30 -20 -15 -10 0 5 10 15 20 25 30
0 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000
5 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000
10 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000
20 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000
22 4000 5000 5000 5000 5000 5000 5000 5000 5000 5000 5000
24 2500 3500 4500 5000 5000 5000 5000 5000 5000 5000 5000
26 1000 2000 3000 4000 4000 4000 5000 5000 5000 5000 5000
28 800 1000 2000 2500 2500 2500 3000 3000 3000 3500 3500
30 800 800 800 800 800 1000 1000 1500 1500 2000 2000
31 600 600 600 700 700 700 800 800 800 800 800
32 600 600 600 600 600 600 600 600 600 600 600
35 0 0 0 0 0 0 0 0 0 0 0
TABLE 1
Wherein "-30", "-20", "-15", "-10", "0", "5", "10", "15", "20", "25", and "30" in fig. 1 are first preset temperature difference values, which are the difference values obtained by subtracting the temperature of the vehicle power battery from the temperature of the environment outside the vehicle. "0", "5", "10", "20", "22", "24", "26", "28", "30", "31", "32" and "33" are second preset temperature differences, which are the temperature of the heat conducting unit minus the temperature of the vehicle power battery. "5000" may be the maximum heating power of the PTC.
On the basis of the above-established mapping relationship, how to determine the target heating power of the PTC will be explained.
Referring to fig. 4, a flow chart of steps of yet another embodiment of a method of heating a vehicle power cell of the present invention is shown.
And 402, acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit.
The vehicle is provided with a sensor capable of acquiring the current temperature of a vehicle power battery, a sensor for acquiring the current temperature of the external environment of the vehicle and a sensor for acquiring the current temperature of the heat conducting unit; and then the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit can be obtained through the data collected by each sensor.
Step 404, a first temperature difference between a current temperature of the vehicle power battery and a current temperature of an environment outside the vehicle is determined.
Step 406, a second temperature difference between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit is determined.
In the embodiment of the invention, the target heating power of the PTC can be determined by searching the mapping relation. The established mapping relation comprises a relation among a first preset temperature difference value, a second preset temperature difference value and a preset heating power of a Positive Temperature Coefficient (PTC) component; furthermore, in the embodiment of the present invention, after acquiring the current temperature of the vehicle power battery, the current temperature of the vehicle external environment, and the current temperature of the heat conducting unit, a difference between the current temperature of the vehicle power battery and the current temperature of the vehicle external environment may be calculated, and a difference between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit may be calculated; for convenience of subsequent description, a first temperature difference between the current temperature of the vehicle power battery and the current temperature of the environment outside the vehicle may be referred to as a first temperature difference, and a second temperature difference between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit may be referred to as a second temperature difference.
In the embodiment of the present invention, if the first preset temperature difference in the established mapping relationship is a difference obtained by subtracting the temperature of the vehicle power battery from the temperature of the vehicle external environment, the first temperature difference is a difference obtained by subtracting the current temperature of the vehicle power battery from the current temperature of the vehicle external environment. If the first preset temperature difference value is a difference value obtained by subtracting the temperature of the vehicle power battery from the temperature of the external environment of the vehicle in the established mapping relation, the first temperature difference value is a difference value obtained by subtracting the current temperature of the vehicle power battery from the current temperature of the external environment of the vehicle. If the established mapping relation is that the second preset temperature difference value is the difference value obtained by subtracting the temperature of the vehicle power battery from the temperature of the heat conduction unit; the second temperature difference is obtained by subtracting the current temperature of the vehicle power battery from the current temperature of the heat conducting unit. If the second preset temperature difference value is the difference value obtained by subtracting the temperature of the heat conduction unit from the temperature of the vehicle power battery in the established mapping relation; the second temperature difference is obtained by subtracting the current temperature of the heat conducting unit from the current temperature of the vehicle power battery.
And step 408, determining a target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
And then searching a mapping relation based on the first temperature difference and the second temperature difference, and determining the target heating power of the PTC. Reference may be made to substeps 4082 through 4084:
sub-step 4082, obtaining a pre-established mapping relation, where the mapping relation includes a relation between a first preset temperature difference value, a second preset temperature difference value, and a preset heating power of a positive temperature coefficient device PTC; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit;
substep 4084, searching a pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining a target heating power corresponding to the PTC of the PTC device.
In the embodiment of the invention, a mapping relation established in advance can be obtained; then searching a target first preset temperature difference value matched with the first temperature difference value and searching a target second preset difference value matched with the second temperature difference value from the mapping relation; and searching for PTC preset heating power corresponding to the target first preset temperature difference and the target first preset temperature difference, and taking the PTC preset heating power as the target heating power corresponding to the PTC.
And step 410, controlling the positive temperature coefficient element PTC, and heating the vehicle power battery through the heat conducting unit by using the target heating power.
In summary, in the embodiment of the present invention, in the process of determining the target heating power of the PTC, a first temperature difference between the current temperature of the power battery of the vehicle and the current temperature of the external environment of the vehicle may be determined; determining a second temperature difference value between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit; then determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value; further quantifying the influence of the temperature of the heat conducting unit and the temperature of the external environment of the vehicle on the temperature of the power battery of the vehicle according to the difference between the current temperature of the power battery of the vehicle and the current temperature of the external environment of the vehicle and the difference between the current temperature of the power battery of the vehicle and the current temperature of the heat conducting unit; the target heating power is accurately determined.
It should be noted that, for simplicity of description, the method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present invention is not limited by the illustrated order of acts, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are presently preferred and that no particular act is required to implement the invention.
Referring to fig. 5, a block diagram of a heating device for a vehicle power battery according to an embodiment of the present invention is shown, and may specifically include the following modules:
a temperature obtaining module 502, configured to obtain a current temperature of the vehicle power battery, a current temperature of an external environment of the vehicle, and a current temperature of the heat conducting unit;
a determining module 504, configured to determine, according to a current temperature of the vehicle power battery, a current temperature of an external environment of the vehicle, and a current temperature of the heat conducting unit, a target heating power corresponding to a positive temperature coefficient device PTC;
and the control module 506 is used for controlling the PTC to heat the vehicle power battery through the heat conducting unit at the target heating power.
Referring to fig. 6, a block diagram of an alternative embodiment of a heating device for a vehicle power battery of the present invention is shown.
In an optional embodiment of the present invention, the determining module 504 includes:
a first temperature difference determination submodule 5042 for determining a first temperature difference between a current temperature of the vehicle power cell and a current temperature of an environment external to the vehicle;
a second temperature difference determination submodule 5044 configured to determine a second temperature difference between a current temperature of the vehicle power battery and a current temperature of the heat conducting unit;
and the power determination submodule 5046 is used for determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
In an optional embodiment of the present invention, the power determining sub-module 5046 is configured to obtain a pre-established mapping relationship, where the mapping relationship includes a relationship between a first preset temperature difference value, a second preset temperature difference value, and a preset heating power of a PTC component; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit; and searching the pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining the target heating power corresponding to the positive temperature coefficient component PTC.
In an optional embodiment of the present invention, the apparatus further comprises:
a relation information acquiring module 508, configured to acquire relation information between heat generated by heating the PTC device, heat absorbed by the heat conducting unit, heat absorbed by the vehicle power battery, and heat absorbed by an external environment of the vehicle; the heat generated by the PTC heating is determined according to the heating power of the PTC, the heat absorbed by the vehicle external environment is determined according to the difference value between the temperature of the vehicle power battery and the temperature of the vehicle external environment, the heat absorbed by the vehicle power battery is determined according to the temperature of the vehicle power battery, and the heat absorbed by the heat conduction unit is determined according to the temperature of the heat conduction unit;
a relationship establishing module 510, configured to establish a mapping relationship according to the relationship information.
In an optional embodiment of the present invention, the relationship establishing module 510 is configured to obtain a thermal shock reference temperature of the vehicle power battery, where the thermal shock reference temperature is a difference between a temperature of the vehicle power battery and a temperature of the heat conducting unit when the vehicle power battery has thermal shock; setting a plurality of temperature difference conditions and preset heating power of the PTC under each temperature difference condition according to the relationship information and the thermal shock reference temperature to obtain the mapping relationship; wherein the temperature difference condition includes: a first predetermined temperature difference and a second predetermined temperature difference.
In summary, in the embodiment of the present invention, during the heating process of the vehicle power battery, the current temperature of the external environment of the vehicle, and the current temperature of the heat conducting unit may be obtained; then determining target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit, and controlling the positive temperature coefficient component PTC to heat the vehicle power battery through the heat conduction unit by using the target heating power; in addition, the heating power of the PTC can be adaptively adjusted according to factors influencing the heat absorption of the vehicle power battery in the heating process of the vehicle power battery; therefore, at least one of the problems of insufficient heating capacity, thermal shock, frequent startup and shutdown of the PTC and the like caused by heating in a PTC heating mode in the prior art is solved.
For the device embodiment, since it is basically similar to the method embodiment, the description is simple, and for the relevant points, refer to the partial description of the method embodiment.
Embodiments also provide a vehicle comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory, and the one or more programs configured to be executed by the one or more processors include a method for performing heating of a vehicle power battery as described in any of the above.
Embodiments of the present invention also provide a readable storage medium, where instructions, when executed by a processor of an electronic device, enable the electronic device to perform any one of the above-described heating methods for a vehicle power battery.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing terminal to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal 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 terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The above detailed description is provided for a heating method of a vehicle power battery, a heating device of a vehicle power battery and a vehicle, and the principle and the implementation of the present invention are explained by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A method of heating a vehicle power battery, comprising:
acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit;
determining target heating power corresponding to a Positive Temperature Coefficient (PTC) component according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit;
and controlling the positive temperature coefficient component PTC, and heating the vehicle power battery by the target heating power through the heat conduction unit.
2. The method according to claim 1, wherein the determining a target heating power corresponding to a Positive Temperature Coefficient (PTC) component according to the current temperature of the vehicle power battery, the current temperature of the environment outside the vehicle and the current temperature of the heat conducting unit comprises:
determining a first temperature difference between a current temperature of the vehicle power battery and a current temperature of an environment external to the vehicle;
determining a second temperature difference value between the current temperature of the vehicle power battery and the current temperature of the heat conducting unit;
and determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
3. The method according to claim 2, wherein the determining the target heating power corresponding to the PTC device according to the first temperature difference and the second temperature difference comprises:
acquiring a pre-established mapping relation, wherein the mapping relation comprises a relation among a first preset temperature difference value, a second preset temperature difference value and a preset heating power of a Positive Temperature Coefficient (PTC) component; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit;
and searching the pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining the target heating power corresponding to the positive temperature coefficient component PTC.
4. The method of claim 3, further comprising:
acquiring relation information among heat generated by heating the positive temperature coefficient component PTC, heat absorbed by the heat conduction unit, heat absorbed by the vehicle power battery and heat absorbed by the external environment of the vehicle; the heat generated by the PTC heating is determined according to the heating power of the PTC, the heat absorbed by the vehicle external environment is determined according to the difference value between the temperature of the vehicle power battery and the temperature of the vehicle external environment, the heat absorbed by the vehicle power battery is determined according to the temperature of the vehicle power battery, and the heat absorbed by the heat conduction unit is determined according to the temperature of the heat conduction unit;
and establishing a mapping relation according to the relation information.
5. The method of claim 4, wherein the establishing a mapping relationship according to the relationship information comprises:
acquiring a thermal shock reference temperature of the vehicle power battery, wherein the thermal shock reference temperature is a difference value between the temperature of the vehicle power battery and the temperature of the heat conducting unit when the vehicle power battery has thermal shock;
setting a plurality of temperature difference conditions and preset heating power of the PTC under each temperature difference condition according to the relationship information and the thermal shock reference temperature to obtain the mapping relationship;
wherein the temperature difference condition includes: a first predetermined temperature difference and a second predetermined temperature difference.
6. A heating device for a vehicle power battery, characterized by comprising:
the temperature acquisition module is used for acquiring the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conduction unit;
the determining module is used for determining target heating power corresponding to the positive temperature coefficient component PTC according to the current temperature of the vehicle power battery, the current temperature of the external environment of the vehicle and the current temperature of the heat conducting unit;
and the control module is used for controlling the positive temperature coefficient component PTC and heating the vehicle power battery by the target heating power through the heat conduction unit.
7. The apparatus of claim 6, wherein the determining module comprises:
a first temperature difference determination submodule for determining a first temperature difference between a current temperature of the vehicle power battery and a current temperature of an environment outside the vehicle;
the second temperature difference determination submodule is used for determining a second temperature difference value between the current temperature of the vehicle power battery and the current temperature of the heat conduction unit;
and the power determination submodule is used for determining the target heating power corresponding to the positive temperature coefficient component PTC according to the first temperature difference value and the second temperature difference value.
8. The apparatus of claim 7,
the power determination submodule is used for acquiring a pre-established mapping relation, and the mapping relation comprises a relation among a first preset temperature difference value, a second preset temperature difference value and a preset heating power of a Positive Temperature Coefficient (PTC) component; the first preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the external environment of the vehicle, and the second preset temperature difference value is the difference value between the preset temperature of the vehicle power battery and the temperature of the heat conducting unit; and searching the pre-established mapping relation according to the first temperature difference and the second temperature difference, and determining the target heating power corresponding to the positive temperature coefficient component PTC.
9. A vehicle comprising a memory, and one or more programs, wherein the one or more programs are stored in the memory, and configured to be executed by the one or more processors comprises a heating method for executing the vehicle power battery according to any one of method claims 1-5.
10. A readable storage medium, characterized in that instructions in the storage medium, when executed by a processor of an electronic device, enable the electronic device to perform the method of heating a vehicle power battery according to any one of method claims 1-5.
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