CN113968160A - Vehicle charging time estimation method, device, equipment and storage medium - Google Patents

Vehicle charging time estimation method, device, equipment and storage medium Download PDF

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CN113968160A
CN113968160A CN202111148319.5A CN202111148319A CN113968160A CN 113968160 A CN113968160 A CN 113968160A CN 202111148319 A CN202111148319 A CN 202111148319A CN 113968160 A CN113968160 A CN 113968160A
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charging
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residual
temperature
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CN113968160B (en
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黄盟盟
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China Express Jiangsu 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
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/62—Monitoring or controlling charging stations in response to charging parameters, e.g. current, voltage or electrical charge
    • 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
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • 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
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

According to the method, the device, the equipment and the storage medium for estimating the vehicle charging time, provided by the embodiment of the invention, the residual charging stage is determined by acquiring the current residual electric quantity of a vehicle battery, and then the temperature peak value is determined; when the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time; calculating the charged capacity according to the charging current of the residual charging stage and the first predicted charging time; calculating a second predicted charging time according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and the preset cooling charging current; and adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle. By adopting the method and the device, the residual charging stage can be determined by acquiring the current residual electric quantity of the vehicle battery, and then the temperature change and the change of the charging current of the charging device in the charging process are determined, so that the charging time duration can be accurately estimated, the time can be reasonably arranged by a user, and the user experience is improved.

Description

Vehicle charging time estimation method, device, equipment and storage medium
Technical Field
The invention relates to the technical field of charging, in particular to a vehicle charging time estimation method, device, equipment and storage medium.
Background
The current situation of global shortage of petroleum resources and serious environmental pollution promotes the development of electric vehicles with the advantages of economy, energy conservation, environmental protection and the like, and rechargeable batteries are applied to the electric vehicles due to the advantages of long service life, environmental protection and the like. Since the capacity of the battery is limited, the battery must be charged after the electric vehicle is used for a certain period of time to continue to provide energy for the electric vehicle.
In practical application, in order to realize intelligent management of the charging process of the electric automobile, the charging time needs to be estimated, in the prior art, the estimation of the charging time is mostly calculated according to a preset charging strategy, however, in order to avoid damage of a charging seat due to overheating, the charging current is often reduced when the temperature is too high, so that the charging time is prolonged, the difference between the charging time and the initially estimated charging time is large, and the charging time cannot be accurately estimated in the previous period. If the actual charging time is longer than the estimated time, the user returns to the vehicle after the estimated time is over, the vehicle is not fully charged actually, the user needs to wait for a long time, and the user experience is not high.
Disclosure of Invention
The embodiment of the invention provides a vehicle charging time estimation method, a vehicle charging time estimation device, a vehicle charging time estimation equipment and a storage medium, which can determine a residual charging stage by acquiring the current residual electric quantity of a vehicle battery, and further determine the temperature change of a charging device and the change of charging current in the charging process, so that the charging time can be accurately estimated, a user can conveniently arrange time reasonably, and the user experience is improved.
In order to achieve the above object, an embodiment of the present invention provides a method for estimating a vehicle charging time, including:
acquiring the current residual capacity of the vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to the current residual capacity and a preset charging strategy;
calculating the temperature change value of each residual charging stage, and determining the temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each residual charging stage;
when the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
calculating the charged capacity of the vehicle battery in the first predicted charging time period according to the charging current of each residual charging stage and the first predicted charging time period;
calculating a second predicted charging time according to the current residual capacity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
and adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
As an improvement of the above scheme, the charging strategy is: a plurality of charging phases divided in advance according to the total charging capacity; then, the determining a plurality of remaining charging stages of the vehicle battery according to the current remaining power and a preset charging strategy specifically includes:
determining a current charging stage corresponding to the current residual electric quantity according to the current residual electric quantity based on a preset mapping relation between the residual electric quantity and the charging stage;
determining a number of remaining charge phases of the vehicle battery according to the current charge phase.
As an improvement of the above scheme, the calculating a temperature change value of each remaining charging phase specifically includes:
calculating a heat generation temperature change value of each residual charging stage according to a preset temperature change coefficient, the charging current of each residual charging stage and the charging time of each residual charging stage;
calculating the heat dissipation temperature change value of each residual charging stage according to a preset heat dissipation coefficient and the charging duration of each residual charging stage;
and calculating the temperature change value of each residual charging stage according to the heat generation temperature change value and the heat dissipation temperature change value.
As a modification of the above, the heat dissipation coefficient is obtained by:
acquiring a current environment temperature, and determining a current heat dissipation coefficient corresponding to the current environment temperature based on a preset mapping relation between the environment temperature and the heat dissipation coefficient according to the current environment temperature;
the temperature change coefficient is obtained by the following method:
acquiring a preset test charging time and a test temperature change value of the charging seat under a preset test charging current;
and calculating a temperature change coefficient according to the preset test charging time, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
As an improvement of the above scheme, the calculating the first predicted charging time specifically includes:
and calculating a first predicted charging time according to the initial temperature, the charging time of each residual charging stage, the temperature change value of each residual charging stage and the preset temperature threshold.
As an improvement of the above scheme, the calculating a second predicted charging duration according to the current remaining power, the charged capacity, the total charging capacity of the vehicle battery, and a preset cooling charging current specifically includes:
subtracting the current residual capacity and the charged capacity from the total charging capacity of the vehicle battery to obtain the residual capacity to be charged;
and dividing the residual capacity to be charged by a preset cooling charging current to obtain a second predicted charging time.
As a modification of the above, the reduced temperature charging current is obtained by:
dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
performing an evolution operation on the current parameter to obtain a balance current;
when the balance current is smaller than a preset strategy current, taking the balance current as a cooling charging current; the strategy current is a preset charging current after a first predicted charging time in the residual charging stage;
and when the balance current is greater than or equal to the strategy current, taking the strategy current as a cooling charging current.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle charging time estimation apparatus, including:
the residual charging stage determining module is used for acquiring the current residual electric quantity of the vehicle battery and determining a plurality of residual charging stages of the vehicle battery according to the current residual electric quantity and a preset charging strategy;
the temperature peak value determining module is used for calculating the temperature change value of each residual charging stage and determining the temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each residual charging stage;
the first predicted charging time calculation module is used for calculating a first predicted charging time when the temperature peak value is greater than or equal to a preset temperature threshold value; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
a charged capacity calculation module for calculating a charged capacity of the first predicted charging period according to the charging current of each remaining charging stage and the first predicted charging period;
the second predicted charging time length calculation module is used for calculating a second predicted charging time length according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
and the vehicle charging time calculation module is used for adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
In order to achieve the above object, an embodiment of the present invention further provides a vehicle charging time estimation device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and the processor implements the vehicle charging time estimation method according to any one of the above embodiments when executing the computer program.
In order to achieve the above object, an embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, where the computer program, when executed, controls a device on which the computer-readable storage medium is located to perform the vehicle charging time estimation method according to any one of the above embodiments.
Compared with the prior art, the vehicle charging time estimation method, the device, the equipment and the storage medium provided by the embodiment of the invention have the advantages that firstly, a plurality of residual charging stages of a vehicle battery are predicted by obtaining the current residual electric quantity of the vehicle battery, then, the temperature peak value is determined by calculating the temperature change value of each residual charging stage, then, when the temperature peak value is greater than the preset temperature threshold value, the first predicted charging time length of the temperature of a charging seat from the initial temperature to the preset temperature threshold value is calculated, meanwhile, the second predicted charging time length is calculated according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and the preset cooling charging current, and finally, the first predicted charging time length and the second predicted charging time length are the predicted total charging time length of the vehicle. According to the embodiment of the invention, the residual charging stage is determined by acquiring the current residual electric quantity of the vehicle battery, and then the temperature change and the change of the charging current of the charging device in the charging process are determined, so that the charging time duration is accurately estimated, the time is reasonably arranged by a user, and the user experience is improved.
Drawings
FIG. 1 is a flow chart of a method for estimating a charging time of a vehicle according to an embodiment of the present invention;
fig. 2 is a block diagram illustrating a vehicle charging time estimation apparatus according to an embodiment of the present invention;
fig. 3 is a block diagram of a vehicle charging time estimation apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a method for estimating a charging time of a vehicle according to an embodiment of the present invention.
The vehicle charging time estimation method provided by the embodiment of the invention comprises the following steps of S11-S16:
s11, obtaining the current residual capacity of the vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to the current residual capacity and a preset charging strategy;
s12, calculating the temperature change value of each residual charging stage, and determining the temperature peak value according to the initial temperature of the charging seat of the vehicle and the temperature change value of each residual charging stage;
s13, when the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time length; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
s14, calculating the charged capacity of the vehicle battery in the first predicted charging time period according to the charging current of each residual charging stage and the first predicted charging time period;
s15, calculating a second predicted charging time according to the current residual capacity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
and S16, adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
It should be noted that the method for estimating the charging time of the vehicle according to the embodiment of the present invention is generally executed by a Battery Management System (BMS), and may also be executed by an additional external device.
Specifically, the current remaining capacity of the vehicle battery at the beginning of charging is obtained, and a plurality of remaining charging stages of the vehicle battery are determined according to the current remaining capacity based on a preset charging strategy because the battery is generally accompanied with a set of complete charging strategy when the design is completed. Generally, in the case where the charging cradle temperature does not exceed the preset temperature threshold, the charging process of the vehicle battery will be strictly charged according to the remaining charging phase.
In the charging process, the initial temperature of the charging seat and the heat generated by charging can influence the real-time temperature of the charging seat, and under the condition that the real-time temperature exceeds a preset temperature threshold value, the heat generated by charging can be reduced in a current reduction mode, and in the whole charging process, charging can not be strictly carried out according to the rest charging stage. The temperature peak can be predicted by: the method comprises the steps of obtaining the initial temperature of a charging seat of the vehicle, calculating the temperature change value of each residual charging stage, calculating the temperature of each residual charging stage according to the initial temperature and the temperature change value of each residual charging stage, and determining the temperature peak value from the temperature change value.
When the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time length; the first predicted charging time length is the charging time length when the temperature of the charging seat reaches a preset temperature threshold value from the initial temperature. Within the first predicted charging period, the vehicle battery is charged strictly in accordance with the remaining charging phase.
After the first prediction charging time, the current needs to be adjusted because the temperature reaches a preset temperature threshold value, so that the heat generated by the current is reduced, and the phenomenon that the service life of the charging seat is influenced due to overhigh temperature is avoided. The total charging time period of the vehicle comprises the first predicted charging time period and the current-adjusted charging time period, and the charging time period is not only related to the current magnitude, but also related to the amount of electricity required to be charged. And multiplying the charging current of each residual charging stage by the first predicted charging time length, calculating the electric quantity (charged capacity) charged by the vehicle battery in the first predicted charging time length, calculating the second predicted charging time length according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and the preset cooling charging current, and adding the first predicted charging time length to the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
When the temperature peak value is smaller than the preset temperature threshold value, the predicted total charging time of the vehicle is equal to the sum of a plurality of charging time corresponding to the residual charging stages.
Compared with the prior art, the method and the device have the advantages that the residual charging stage can be determined by obtaining the current residual electric quantity of the vehicle battery, and then the temperature change of the charging device and the change of the charging current in the charging process are determined, so that the charging time duration can be accurately estimated, a user can conveniently arrange time reasonably, and the user experience is improved.
In one embodiment, the charging strategy in step S11 is a number of charging phases divided in advance according to the total charging capacity; then, the determining a plurality of remaining charging stages of the vehicle battery according to the current remaining capacity and a preset charging strategy specifically includes steps S111 to S112:
s111, determining a current charging stage corresponding to the current residual capacity according to the current residual capacity based on a preset mapping relation between the residual capacity and the charging stage;
and S112, determining a plurality of residual charging stages of the vehicle battery according to the current charging stage.
Specifically, the charging strategy is an important part of battery design, and is already set when the battery is designed, generally, the battery can be charged according to the charging strategy, the charging strategy is formulated by comprehensively considering factors of various aspects, including the total charging capacity of the battery, the material of the battery (such as a lithium battery, and the risk of lithium precipitation of the battery is increased due to too high charging rate), and the like, the charging strategy of the embodiment of the invention comprises a plurality of charging stages, and each charging stage has corresponding charging current and charging time. For example, 10 charging phases are included: d1, D2, D3, D4, D5, D6, D7, D8, D9, D10, each charging phase corresponding to the current remaining capacity of the battery: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, when the vehicle remaining capacity is 40%, the corresponding charging phase is D4, and the remaining charging phase includes D4, D5, D6, D7, D8, D9, D10. And determining a current charging stage corresponding to the current residual capacity in the charging strategy according to the current residual capacity based on the preset mapping relation between the residual capacity and the charging stages, and further determining a plurality of residual charging stages of the vehicle battery.
In one embodiment, the step of calculating the temperature variation value of each remaining charging phase in step S12 specifically includes steps S121 to S123:
s121, calculating a heat generation temperature change value of each residual charging stage according to a preset temperature change coefficient, the charging current of each residual charging stage and the charging time of each residual charging stage;
s122, calculating a heat dissipation temperature change value of each residual charging stage according to a preset heat dissipation coefficient and the charging duration of each residual charging stage;
and S123, calculating the temperature change value of each residual charging stage according to the heat generation temperature change value and the heat dissipation temperature change value.
Exemplarily, taking the first remaining charging phase as an example: multiplying a preset temperature change coefficient, the charging current of the first residual charging stage and the charging time of the first residual charging stage to obtain a heat generation temperature change value of the first residual charging stage; multiplying a preset heat dissipation coefficient by the charging time of the first residual charging stage to obtain a heat dissipation temperature change value corresponding to the first residual charging stage; since the actual temperature change value is the generated temperature minus the dissipated temperature, the temperature change value of the first remaining charging stage can be obtained by subtracting the heat dissipation temperature change value from the heat generation temperature change value. The temperature change values of the other residual charging phases can be obtained by calculation according to the same calculation mode, and the specific calculation formula of the temperature change values of the residual charging phases is delta Ta＝Ia 2tak-KHeat dissipationta(ii) a Wherein, Delta TaRepresenting the temperature variation value, I, of the a-th remaining charging phaseaCharging current of the a-th remaining charging phase, taThe charging time of the a-th residual charging stage is shown, the number of the residual charging stages is n, a represents a positive integer which is greater than 0 and less than or equal to n, K represents a temperature change coefficient, and KHeat dissipationRepresenting the heat dissipation coefficient.
In one embodiment, the temperature coefficient in step S121 is obtained by the following steps, including steps S1211 to S1212:
s1211, acquiring a preset test charging time and a test temperature change value of the charging seat under a preset test charging current;
and S1212, calculating a temperature change coefficient according to the preset test charging duration, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
Specifically, in the charging process of the vehicle battery, the heat generated by the charging base is specifically: q ═ I2R delta t, wherein I is a preset test charging current, R is the equivalent internal resistance of the charging seat connected with the charging gun, and delta t is a preset test charging duration; the heat that the charging seat produced can cause the temperature of charging seat to rise, according to the specific heat capacity formula, can derive: delta TTemperature rise＝Q/(CM)＝I2R Δ t/(CM); wherein, Delta TTemperature riseC is the equivalent specific heat capacity of the connection between the charging seat and the charging gun, M is the equivalent mass of the connection between the charging seat and the charging gun, and the temperature change coefficient k is R/(CM), so that delta TTemperature rise＝I2And delta tk, namely obtaining a temperature change coefficient k through a preset test, acquiring the starting temperature and the ending temperature of the test through a temperature sensor under the preset test charging duration and the preset charging current, and subtracting the starting temperature from the ending temperature to obtain delta TTemperature riseAccording to Δ TTemperature rise＝I2And delta tk, calculating to obtain the temperature change coefficient.
It is to be noted that, with regard to the definition of the temperature change coefficient (k ═ R/(CM)), since the equivalent internal resistance may change with the increase of the number of times of use and the time of use of the charging stand and the charging gun, or the values of the equivalent specific heat capacity and the equivalent internal resistance may not be obtained in advance, in this case, the temperature change coefficient may be calculated by the above experiment.
In one embodiment, the heat dissipation factor in step S122 is obtained by:
the method comprises the steps of obtaining the current environment temperature, and determining the current heat dissipation coefficient corresponding to the current environment temperature based on the mapping relation between the preset environment temperature and the heat dissipation coefficient according to the current environment temperature.
It should be noted that the heat dissipation coefficient reflects the heat dissipation capability of the charging base to a certain extent, the heat dissipation coefficients of the charging base at different environmental temperatures are different, and the mapping relationship between the environmental temperature and the heat dissipation coefficient can be obtained by the prior art.
In one embodiment, the calculating the first predicted charging time period in step S13 specifically includes:
and calculating a first predicted charging time according to the initial temperature, the charging time of each residual charging stage, the temperature change value of each residual charging stage and the preset temperature threshold.
Specifically, subtracting the initial temperature from a preset temperature threshold value to obtain a total temperature change value; and determining the residual charging stages with the temperature reaching a preset temperature threshold according to the total temperature change value and the temperature change value of each residual charging stage, and combining the charging time length of each residual charging stage to obtain a first predicted charging time length.
In one embodiment, the calculating a second predicted charging duration according to the current remaining capacity, the charged capacity, the total charging capacity of the vehicle battery, and the preset temperature-decreasing charging current in step S15 specifically includes steps S151 to S152:
s151, subtracting the current residual capacity and the charged capacity from the total charging capacity of the vehicle battery to obtain the residual capacity to be charged;
and S152, dividing the residual capacity to be charged by a preset cooling charging current to obtain a second predicted charging time.
It is worth mentioning that, in the first predicted charging period, the vehicle battery is charged according to a preset charging strategy during charging, and in the second predicted charging period, the vehicle battery is charged with the cooling charging current.
In one embodiment, the charging current for decreasing temperature in step S152 is obtained by the following steps, including steps S1521 to S1524:
s1521, dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
s1522, performing evolution operation on the current parameters to obtain balance current;
s1523, when the balance current is smaller than a preset strategy current, taking the balance current as a cooling charging current; the strategy current is a preset charging current after a first predicted charging time in the residual charging stage;
s1524, when the balance current is larger than or equal to the strategy current, the strategy current is used as a cooling charging current.
Specifically, the temperature change of the charging seat is determined by a heat production temperature change value and a heat dissipation temperature change value, when the heat production temperature change value is equal to the heat dissipation temperature change value, the temperature of the charging seat is kept unchanged, and a calculation formula I according to the temperature changeBalancing 2Δtk-KHeat dissipationΔ t is 0, wherein IBalancingRepresenting the equilibrium current, making the temperature change 0, calculating the equilibrium current as
Figure BDA0003286271510000111
Wherein, KHeat dissipationRepresenting the current heat dissipation coefficient, and k represents a temperature change coefficient; when the balance current is smaller than the preset strategy current, taking the balance current as a cooling charging current; when the balance current is greater than or equal to the strategy current, taking the strategy current as a cooling charging current; the strategy current is the charging current after a preset first prediction charging time period in the residual charging stage.
It is worth to be noted that, when the strategy current is larger than the balance current, if the vehicle battery is charged according to the original strategy current, the temperature of the charging seat will be continuously raised, so that in order to avoid the overhigh temperature, the balance current with smaller current is used as the cooling charging current for charging; when the balance current is greater than or equal to the strategy current, the strategy current is used for charging the vehicle battery, which does not result in the temperature of the charging seat to continuously rise.
The vehicle charging time estimation method provided by the embodiment of the invention comprises the steps of firstly predicting a plurality of residual charging stages of a vehicle battery by obtaining the current residual electric quantity of the vehicle battery, then determining a temperature peak value by calculating the temperature change value of each residual charging stage, then calculating a first predicted charging time length from the initial temperature to a preset temperature threshold value of the temperature of a charging seat when the temperature peak value is greater than the preset temperature threshold value, meanwhile calculating a second predicted charging time length according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current, and finally taking the first predicted charging time length and the second predicted charging time length as the predicted total charging time length of the vehicle. According to the embodiment of the invention, the plurality of residual charging stages are determined by acquiring the current residual electric quantity of the vehicle battery, and then the temperature change and the change of the charging current of the charging device in the charging process are determined, so that the charging time duration is accurately estimated, the time is reasonably arranged by a user, and the user experience is improved.
Referring to fig. 2, which is a block diagram of a vehicle charging time estimation device according to an embodiment of the present invention, a vehicle charging time estimation device 10 includes:
the residual charging stage determining module 11 is configured to obtain a current residual electric quantity of the vehicle battery, and determine a plurality of residual charging stages of the vehicle battery according to the current residual electric quantity and a preset charging strategy;
a temperature peak value determining module 12, configured to calculate a temperature change value of each remaining charging phase, and determine a temperature peak value according to an initial temperature of a charging dock of the vehicle and the temperature change value of each remaining charging phase;
a first predicted charging time calculation module 13, configured to calculate a first predicted charging time when the temperature peak is greater than or equal to a preset temperature threshold; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
a charged capacity calculation module 14, configured to calculate a charged capacity of the first predicted charging time period according to the charging current of each remaining charging phase and the first predicted charging time period;
a second predicted charging duration calculation module 15, configured to calculate a second predicted charging duration according to the current remaining power, the charged capacity, a total charging capacity of a vehicle battery, and a preset cooling charging current;
and the vehicle charging time calculation module 16 is configured to add the first predicted charging time length and the second predicted charging time length to obtain a predicted total charging time length of the vehicle.
Specifically, the current remaining capacity of the vehicle battery at the beginning of charging is obtained, and a plurality of remaining charging stages of the vehicle battery are determined according to the current remaining capacity based on a preset charging strategy because the battery is generally accompanied with a set of complete charging strategy when the design is completed. Generally, in the case where the charging cradle temperature does not exceed the preset temperature threshold, the charging process of the vehicle battery will be strictly charged according to the remaining charging phase.
In the charging process, the initial temperature of the charging seat and the heat generated by charging can influence the real-time temperature of the charging seat, and under the condition that the real-time temperature exceeds a preset temperature threshold value, the heat generated by charging can be reduced in a current reduction mode, and in the whole charging process, charging can not be strictly carried out according to the rest charging stage. The temperature peak can be predicted by: the method comprises the steps of obtaining the initial temperature of a charging seat of the vehicle, calculating the temperature change value of each residual charging stage, calculating the temperature of each residual charging stage according to the initial temperature and the temperature change value of each residual charging stage, and determining the temperature peak value from the temperature change value.
When the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time length; the first predicted charging time length is the charging time length when the temperature of the charging seat reaches a preset temperature threshold value from the initial temperature. Within the first predicted charging period, the vehicle battery is charged strictly in accordance with the remaining charging phase.
After the first prediction charging time, the current needs to be adjusted because the temperature reaches a preset temperature threshold value, so that the heat generated by the current is reduced, and the phenomenon that the service life of the charging seat is influenced due to overhigh temperature is avoided. The total charging time period of the vehicle comprises the first predicted charging time period and the current-adjusted charging time period, and the charging time period is not only related to the current magnitude, but also related to the amount of electricity required to be charged. And multiplying the charging current of each residual charging stage by the first predicted charging time length, calculating the electric quantity (charged capacity) charged by the vehicle battery in the first predicted charging time length, calculating the second predicted charging time length according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and the preset cooling charging current, and adding the first predicted charging time length to the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
When the temperature peak value is smaller than the preset temperature threshold value, the predicted total charging time of the vehicle is equal to the sum of a plurality of charging time corresponding to the residual charging stages.
Compared with the prior art, the method and the device have the advantages that the residual charging stage can be determined by obtaining the current residual electric quantity of the vehicle battery, and then the temperature change of the charging device and the change of the charging current in the charging process are determined, so that the charging time duration can be accurately estimated, a user can conveniently arrange time reasonably, and the user experience is improved.
In one embodiment, the remaining charging phase determining module 11 specifically includes:
a current charging stage determining unit, configured to determine, based on a preset mapping relationship between a remaining power and a charging stage, a current charging stage corresponding to the current remaining power according to the current remaining power;
and the residual charging stage determining unit is used for determining a plurality of residual charging stages of the vehicle battery according to the current charging stage.
Specifically, the charging strategy is an important part of battery design, and is already set when the battery is designed, generally, the battery is charged according to the charging strategy, and the charging strategy is formulated by comprehensively considering factors of various aspects, including the total charging capacity of the battery, the material of the battery (such as a lithium battery, and the risk of lithium precipitation of the battery is increased when the charging rate is too high). For example, 10 charging phases are included: d1, D2, D3, D4, D5, D6, D7, D8, D9, D10, each charging phase corresponding to the current remaining capacity of the battery: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, when the vehicle remaining capacity is 40%, the corresponding charging phase is D4, and the remaining charging phase includes D4, D5, D6, D7, D8, D9, D10. And determining a current charging stage corresponding to the current residual capacity in the charging strategy according to the current residual capacity based on the preset mapping relation between the residual capacity and the charging stages, and further determining a plurality of residual charging stages of the vehicle battery.
In one embodiment, the temperature peak determining module 12 specifically includes:
the heat production temperature change value calculation unit is used for calculating the heat production temperature change value of each residual charging stage according to a preset temperature change coefficient, the charging current of each residual charging stage and the charging time of each residual charging stage;
the heat dissipation temperature change value calculation unit is used for calculating the heat dissipation temperature change value of each residual charging stage according to a preset heat dissipation coefficient and the charging time of each residual charging stage;
and the temperature change value calculating unit is used for calculating the temperature change value of each residual charging stage according to the heat generation temperature change value and the heat dissipation temperature change value.
Exemplarily, taking the first remaining charging phase as an example: multiplying a preset temperature change coefficient, the charging current of the first residual charging stage and the charging time of the first residual charging stage to obtain a heat generation temperature change value of the first residual charging stage; multiplying a preset heat dissipation coefficient by the charging time of the first residual charging stage to obtain a heat dissipation temperature change value corresponding to the first residual charging stage; since the actual temperature change value is the generated temperature minus the dissipated temperature, the temperature change value of the first remaining charging stage can be obtained by subtracting the heat dissipation temperature change value from the heat generation temperature change value. The temperature change values of the other residual charging phases can be obtained by calculation according to the same calculation mode, and the specific calculation formula of the temperature change values of the residual charging phases is delta Ta＝Ia 2tak-KHeat dissipationta(ii) a Wherein, Delta TaRepresenting the temperature variation value, I, of the a-th remaining charging phaseaCharging current of the a-th remaining charging phase, taThe charging time of the a-th residual charging stage is shown, the number of the residual charging stages is n, a represents a positive integer which is greater than 0 and less than or equal to n, K represents a temperature change coefficient, and KHeat dissipationRepresenting the heat dissipation coefficient.
In one embodiment, the heat generation temperature change value calculation unit further includes:
the device comprises a test temperature change value acquisition subunit, a charging control subunit and a charging control unit, wherein the test temperature change value acquisition subunit is used for acquiring a preset test charging time and a test temperature change value of the charging seat under a preset test charging current;
and the temperature change coefficient calculating subunit is used for calculating the temperature change coefficient according to the preset test charging time, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
Specifically, in the charging process of the vehicle battery, the heat generated by the charging base is specifically: q ═ I2R Δ t, whereinI is a preset test charging current, R is an equivalent internal resistance of a charging seat connected with a charging gun, and delta t is a preset test charging time; the heat that the charging seat produced can cause the temperature of charging seat to rise, according to the specific heat capacity formula, can derive: delta TTemperature rise＝Q/(CM)＝I2R Δ t/(CM); wherein, Delta TTemperature riseC is the equivalent specific heat capacity of the connection between the charging seat and the charging gun, M is the equivalent mass of the connection between the charging seat and the charging gun, and the temperature change coefficient k is R/(CM), so that delta TTemperature rise＝I2And delta tk, namely obtaining a temperature change coefficient k through a preset test, acquiring the starting temperature and the ending temperature of the test through a temperature sensor under the preset test charging duration and the preset charging current, and subtracting the starting temperature from the ending temperature to obtain delta TTemperature riseAccording to Δ TTemperature rise＝I2And delta tk, calculating to obtain the temperature change coefficient.
It is to be noted that, with regard to the definition of the temperature change coefficient (k ═ R/(CM)), since the equivalent internal resistance may change with the increase of the number of times of use and the time of use of the charging stand and the charging gun, or the values of the equivalent specific heat capacity and the equivalent internal resistance may not be obtained in advance, in this case, the temperature change coefficient may be calculated by the above experiment.
In an embodiment, the heat dissipation temperature change value calculation unit is further configured to obtain a current environment temperature, and determine, according to the current environment temperature, a current heat dissipation coefficient corresponding to the current environment temperature based on a preset mapping relationship between the environment temperature and the heat dissipation coefficient.
It should be noted that the heat dissipation coefficient reflects the heat dissipation capability of the charging base to a certain extent, the heat dissipation coefficients of the charging base at different environmental temperatures are different, and the mapping relationship between the environmental temperature and the heat dissipation coefficient can be obtained by the prior art.
In an embodiment, the first predicted charging duration calculation module is specifically configured to calculate the first predicted charging duration according to the initial temperature, the charging duration of each remaining charging phase, the temperature variation value of each remaining charging phase, and the preset temperature threshold.
Specifically, subtracting the initial temperature from a preset temperature threshold value to obtain a total temperature change value; and determining the residual charging stages with the temperature reaching a preset temperature threshold according to the total temperature change value and the temperature change value of each residual charging stage, and combining the charging time length of each residual charging stage to obtain a first predicted charging time length.
In an embodiment, the second predicted charging time period calculation module 15 specifically includes:
a remaining capacity-to-be-charged calculation unit configured to subtract the current remaining capacity and the charged capacity from a total charging capacity of a vehicle battery to obtain a remaining capacity-to-be-charged;
and the second predicted charging time length calculation unit is used for dividing the residual capacity to be charged by the preset cooling charging current to obtain a second predicted charging time length.
It is worth mentioning that, in the first predicted charging period, the vehicle battery is charged according to a preset charging strategy during charging, and in the second predicted charging period, the vehicle battery is charged with the cooling charging current.
In one embodiment, the second predicted charging period calculation unit further includes:
the current parameter calculating subunit is used for dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
the balance current calculation subunit is used for performing an evolution operation on the current parameter to obtain a balance current;
the cooling charging current determining subunit is used for taking the balance current as a cooling charging current when the balance current is smaller than a preset strategy current; the strategy current is a preset charging current after a first predicted charging time in the residual charging stage;
and the cooling charging current determining subunit is further used for taking the strategy current as the cooling charging current when the balance current is greater than or equal to the strategy current.
Specifically, the temperature change of the charging seat is composed of heat production temperature change values andthe variation value of the heat dissipation temperature is determined, when the variation value of the heat production temperature is equal to the variation value of the heat dissipation temperature, the temperature of the charging seat is kept unchanged, and the calculation formula I of the temperature variation is usedBalancing 2Δtk-KHeat dissipationΔ t is 0, wherein IBalancingRepresenting the equilibrium current, making the temperature change 0, calculating the equilibrium current as
Figure BDA0003286271510000171
Wherein, KHeat dissipationRepresenting the current heat dissipation coefficient, and k represents a temperature change coefficient; when the balance current is smaller than the preset strategy current, taking the balance current as a cooling charging current; when the balance current is greater than or equal to the strategy current, taking the strategy current as a cooling charging current; the strategy current is the charging current after a preset first prediction charging time period in the residual charging stage.
It is worth to be noted that, when the strategy current is larger than the balance current, if the vehicle battery is charged according to the original strategy current, the temperature of the charging seat will be continuously raised, so that in order to avoid the overhigh temperature, the balance current with smaller current is used as the cooling charging current for charging; when the balance current is greater than or equal to the strategy current, the strategy current is used for charging the vehicle battery, which does not result in the temperature of the charging seat to continuously rise.
The vehicle charging time estimation device 10 provided by the embodiment of the invention includes that a plurality of residual charging stages of a vehicle battery are predicted by acquiring the current residual electric quantity of the vehicle battery, a temperature peak value is determined by calculating the temperature change value of each residual charging stage, then, when the temperature peak value is larger than a preset temperature threshold value, a first predicted charging time length of the temperature of a charging seat from the initial temperature to the preset temperature threshold value is calculated, meanwhile, a second predicted charging time length is calculated according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current, and finally, the first predicted charging time length and the second predicted charging time length are the predicted total charging time length of the vehicle. According to the embodiment of the invention, the plurality of residual charging stages are determined by acquiring the current residual electric quantity of the vehicle battery, and then the temperature change and the change of the charging current of the charging device in the charging process are determined, so that the charging time duration is accurately estimated, the time is reasonably arranged by a user, and the user experience is improved.
It should be noted that, for a specific working process of the vehicle charging time estimation apparatus 10, reference may be made to the working process of the vehicle charging time estimation method in the foregoing embodiment, and details are not repeated herein.
Referring to fig. 3, a vehicle charging time estimation device 20 provided by an embodiment of the present invention includes a processor 21, a memory 22, and a computer program stored in the memory 22 and configured to be executed by the processor 21, where the processor 21 executes the computer program to implement the steps in the vehicle charging time estimation method embodiments, such as the steps S11 to S16 shown in fig. 1; alternatively, the processor 21, when executing the computer program, implements the functions of the modules in the device embodiments, such as the remaining charging phase determining module 11.
Illustratively, the computer program may be divided into one or more modules, which are stored in the memory 22 and executed by the processor 21 to accomplish the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the vehicle charging time estimation device 20. For example, the computer program may be divided into a remaining charging phase determination module 11, a temperature peak value determination module 12, a first predicted charging period calculation module 13, a charged capacity calculation module 14, a second predicted charging period calculation module 15, and a vehicle charging period calculation module 16, each of which functions specifically as follows:
the residual charging stage determining module 11 is configured to obtain a current residual electric quantity of the vehicle battery, and determine a plurality of residual charging stages of the vehicle battery according to the current residual electric quantity and a preset charging strategy;
a temperature peak value determining module 12, configured to calculate a temperature change value of each remaining charging phase, and determine a temperature peak value according to an initial temperature of a charging dock of the vehicle and the temperature change value of each remaining charging phase;
a first predicted charging time calculation module 13, configured to calculate a first predicted charging time when the temperature peak is greater than or equal to a preset temperature threshold; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
a charged capacity calculation module 14, configured to calculate a charged capacity of the first predicted charging time period according to the charging current of each remaining charging phase and the first predicted charging time period;
a second predicted charging duration calculation module 15, configured to calculate a second predicted charging duration according to the current remaining power, the charged capacity, a total charging capacity of a vehicle battery, and a preset cooling charging current;
and the vehicle charging time calculation module 16 is configured to add the first predicted charging time length and the second predicted charging time length to obtain a predicted total charging time length of the vehicle.
The specific working process of each module can refer to the working process of the vehicle charging time estimation device 10 described in the above embodiment, and is not described herein again.
The vehicle charging time estimation device 20 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The vehicle charging time estimation device 20 may include, but is not limited to, a processor 21 and a memory 22. It will be understood by those skilled in the art that the schematic diagram is merely an example of the vehicle charge time estimation device, and does not constitute a limitation of the vehicle charge time estimation device 20, and may include more or less components than those shown, or combine some components, or different components, for example, the vehicle charge time estimation device 20 may further include an input-output device, a network access device, a bus, etc.
The Processor 21 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, and the processor 21 is a control center of the vehicle charging time estimation device 20, and various interfaces and lines are used to connect various parts of the entire vehicle charging time estimation device 20.
The memory 22 may be used to store the computer programs and/or modules, and the processor 21 may implement various functions of the vehicle charging time estimation apparatus 20 by operating or executing the computer programs and/or modules stored in the memory 22 and calling data stored in the memory 22. The memory 22 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the operation of the VCU, and the like. In addition, the memory 22 may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The integrated modules of the vehicle charging time estimation device 20 may be stored in a computer readable storage medium if they are implemented in the form of software functional units and sold or used as independent products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. A vehicle charging time estimation method is characterized by comprising the following steps:
acquiring the current residual capacity of the vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to the current residual capacity and a preset charging strategy;
calculating the temperature change value of each residual charging stage, and determining the temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each residual charging stage;
when the temperature peak value is larger than or equal to a preset temperature threshold value, calculating a first predicted charging time; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
calculating the charged capacity of the vehicle battery in the first predicted charging time period according to the charging current of each residual charging stage and the first predicted charging time period;
calculating a second predicted charging time according to the current residual capacity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
and adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
2. The vehicle charge time estimation method of claim 1, wherein the charge policy is: a plurality of charging phases divided in advance according to the total charging capacity; then, the determining a plurality of remaining charging stages of the vehicle battery according to the current remaining power and a preset charging strategy specifically includes:
determining a current charging stage corresponding to the current residual electric quantity according to the current residual electric quantity based on a preset mapping relation between the residual electric quantity and the charging stage;
determining a number of remaining charge phases of the vehicle battery according to the current charge phase.
3. The method for estimating vehicle charging time according to claim 1, wherein the calculating the temperature variation value of each remaining charging phase specifically includes:
calculating a heat generation temperature change value of each residual charging stage according to a preset temperature change coefficient, the charging current of each residual charging stage and the charging time of each residual charging stage;
calculating the heat dissipation temperature change value of each residual charging stage according to a preset heat dissipation coefficient and the charging duration of each residual charging stage;
and calculating the temperature change value of each residual charging stage according to the heat generation temperature change value and the heat dissipation temperature change value.
4. The vehicle charge time estimation method according to claim 3, wherein the heat dissipation coefficient is obtained by:
acquiring a current environment temperature, and determining a current heat dissipation coefficient corresponding to the current environment temperature based on a preset mapping relation between the environment temperature and the heat dissipation coefficient according to the current environment temperature;
the temperature change coefficient is obtained by the following method:
acquiring a preset test charging time and a test temperature change value of the charging seat under a preset test charging current;
and calculating a temperature change coefficient according to the preset test charging time, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
5. The method of claim 3, wherein the calculating the first predicted charging duration specifically comprises:
and calculating a first predicted charging time according to the initial temperature, the charging time of each residual charging stage, the temperature change value of each residual charging stage and the preset temperature threshold.
6. The method for estimating vehicle charging time according to claim 3, wherein the calculating a second predicted charging duration according to the current remaining capacity, the charged capacity, the total charging capacity of the vehicle battery, and the preset cool-down charging current specifically comprises:
subtracting the current residual capacity and the charged capacity from the total charging capacity of the vehicle battery to obtain the residual capacity to be charged;
and dividing the residual capacity to be charged by a preset cooling charging current to obtain a second predicted charging time.
7. The vehicle charge time estimation method according to claim 6, wherein the reduced temperature charge current is obtained by:
dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
performing an evolution operation on the current parameter to obtain a balance current;
when the balance current is smaller than a preset strategy current, taking the balance current as a cooling charging current; the strategy current is a preset charging current after a first predicted charging time in the residual charging stage;
and when the balance current is greater than or equal to the strategy current, taking the strategy current as a cooling charging current.
8. A vehicle charge time estimation device, comprising:
the residual charging stage determining module is used for acquiring the current residual electric quantity of the vehicle battery and determining a plurality of residual charging stages of the vehicle battery according to the current residual electric quantity and a preset charging strategy;
the temperature peak value determining module is used for calculating the temperature change value of each residual charging stage and determining the temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each residual charging stage;
the first predicted charging time calculation module is used for calculating a first predicted charging time when the temperature peak value is greater than or equal to a preset temperature threshold value; wherein the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the temperature of the charging dock;
a charged capacity calculation module for calculating a charged capacity of the first predicted charging period according to the charging current of each remaining charging stage and the first predicted charging period;
the second predicted charging time length calculation module is used for calculating a second predicted charging time length according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
and the vehicle charging time calculation module is used for adding the first predicted charging time length and the second predicted charging time length to obtain the predicted total charging time length of the vehicle.
9. A charge time estimation device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the vehicle charge time estimation method according to claims 1-7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for estimating vehicle charging time according to claims 1-7.
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