CN113968160B - Vehicle charging time estimation method, device, equipment and storage medium - Google Patents
Vehicle charging time estimation method, device, equipment and storage medium Download PDFInfo
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- CN113968160B CN113968160B CN202111148319.5A CN202111148319A CN113968160B CN 113968160 B CN113968160 B CN 113968160B CN 202111148319 A CN202111148319 A CN 202111148319A CN 113968160 B CN113968160 B CN 113968160B
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Classifications
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- 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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- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
According to the vehicle charging time estimation method, device, equipment and storage medium provided by the embodiment of the invention, the current residual electric quantity of the vehicle battery is obtained, the residual charging stage is determined, and then the temperature peak value is determined; when the temperature peak value is greater than or equal to a preset temperature threshold value, calculating a first predicted charging duration; calculating a charged capacity according to the charging current of the remaining charging stage and the first predicted charging duration; calculating a second predicted charging duration 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. The invention can determine the remaining charging stage by acquiring the current remaining capacity of the vehicle battery, and further determine the temperature change of the charging device and the change of the charging current in the charging process, thereby accurately estimating the charging duration, facilitating the reasonable time arrangement of users and improving the user experience.
Description
Technical Field
The present invention relates to the field of charging technologies, and in particular, to a method, an apparatus, a device, and a storage medium for estimating a charging time of a vehicle.
Background
The current situation of shortage of global 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 the rechargeable battery is 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, after the electric vehicle is used for a period of time, the battery must be charged to continue to supply energy to 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 charging time is mostly estimated according to a preset charging strategy, however, in order to avoid damage of the charging seat caused by overheat, the charging current is often reduced when the temperature is too high, so that the charging time becomes long, the difference between the charging time and the charging time estimated at the beginning is larger, and the charging time cannot be estimated accurately in the early stage. 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 in practice, 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 prediction method, device, equipment and storage medium, which can determine a remaining charging stage by acquiring the current remaining capacity of a vehicle battery, and further determine the temperature change of a charging device and the change of charging current in a charging process, so that the charging time is accurately predicted, the time is reasonably arranged by a user, and the user experience is improved.
In order to achieve the above object, an embodiment of the present invention provides a vehicle charging time estimation method, including:
acquiring the current residual electric quantity of a vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to a preset charging strategy according to the current residual electric quantity;
calculating a temperature change value of each remaining charging stage, and determining a temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each remaining charging stage;
when the temperature peak value is greater than or equal to a preset temperature threshold value, calculating a first predicted charging duration; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
calculating the charged capacity of the vehicle battery in the first predicted charging duration according to the charging current of each remaining charging stage and the first predicted charging duration;
Calculating a second predicted charging duration 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 adding the first predicted charging duration and the second predicted charging duration to obtain the predicted total charging duration of the vehicle.
As an improvement of the above scheme, the charging strategy is: a plurality of charging stages divided in advance according to the total charging capacity; and determining a plurality of remaining charging stages of the vehicle battery according to the current remaining power and a preset charging strategy, wherein the steps specifically comprise:
determining a current charging stage corresponding to the current residual electric quantity according to the current residual electric quantity based on a mapping relation between the preset residual electric quantity and the charging stage;
and determining a plurality of remaining charging phases of the vehicle battery according to the current charging phase.
As an improvement of the above solution, the calculating the temperature change value of each remaining charging stage specifically includes:
calculating a heat generation temperature change value of each residual charging stage according to a preset temperature change coefficient, a charging current of each residual charging stage and a charging duration of each residual charging stage;
According to a preset heat dissipation coefficient and the charging duration of each residual charging stage, calculating a heat dissipation temperature change value 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 an improvement of the above-described solution, the heat dissipation factor is obtained by:
acquiring a current environment temperature, and determining a current heat dissipation coefficient corresponding to the current environment temperature based on a mapping relation between a preset environment temperature and the heat dissipation coefficient according to the current environment temperature;
the temperature change coefficient is obtained by:
acquiring a preset test charging duration 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 length, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
As an improvement of the above solution, the calculating the first predicted charging duration specifically includes:
and calculating a first predicted charging duration according to the initial temperature, the charging duration of each remaining charging stage, the temperature change value of each remaining charging stage and the preset temperature threshold.
As an improvement of the above solution, the calculating the second predicted charging duration according to the current remaining power, the charged capacity, the total charging capacity of the vehicle battery, and the preset cooling charging current specifically includes:
subtracting the current residual electric quantity and the charged capacity from the total charge capacity of the vehicle battery to obtain a residual capacity to be charged;
and dividing the remaining capacity to be charged by a preset cooling charging current to obtain a second predicted charging duration.
As an improvement of the above-described scheme, the temperature-lowering charging current is obtained by:
dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
performing evolution operation on the current parameters to obtain balanced 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 charging current after a first predicted charging duration in the preset 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 estimating device, including:
The vehicle battery charging system comprises a residual charging stage determining module, a charging stage determining module and a charging stage determining module, wherein the residual charging stage determining module is used for obtaining the current residual electric quantity of a vehicle battery and determining a plurality of residual charging stages of the vehicle battery according to a preset charging strategy according to the current residual electric quantity;
the temperature peak value determining module is used for calculating a temperature change value of each remaining charging stage and determining a temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each remaining charging stage;
the first predicted charging duration calculation module is used for calculating a first predicted charging duration when the temperature peak value is greater than or equal to a preset temperature threshold value; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
the charged capacity calculation module is used for calculating the charged capacity of the first predicted charging duration according to the charging current of each residual charging stage and the first predicted charging duration;
the second predicted charging duration calculation module is used for calculating a second predicted charging duration 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, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor executes the computer program to implement the vehicle charging time estimation method according to any one of the embodiments.
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, and when the computer program runs, the device where the computer readable storage medium is controlled to execute the vehicle charging time estimation method according to any one of the embodiments.
Compared with the prior art, the vehicle charging time prediction 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 the vehicle battery are predicted by acquiring the current residual electric quantity of the vehicle battery, then, the temperature change value of each residual charging stage is calculated, so that a temperature peak value is determined, then, when the temperature peak value is larger than a preset temperature threshold value, a first predicted charging time length from the initial temperature to the preset temperature threshold value of the temperature of the charging seat 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 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 remaining charging stage is determined by acquiring the current remaining capacity of the vehicle battery, and further, the temperature change of the charging device and the change of the charging current in the charging process are determined, so that the charging duration is accurately estimated, the reasonable time arrangement of a user is facilitated, and the user experience is improved.
Drawings
FIG. 1 is a flowchart of a method for estimating a vehicle charging time according to an embodiment of the present invention;
FIG. 2 is a block diagram illustrating a vehicle charge 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 following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flowchart of a vehicle charging time estimation method according to an embodiment of the invention is shown.
The vehicle charging time estimation method provided by the embodiment of the invention comprises the following steps of S11 to S16:
s11, acquiring the current residual capacity of a vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to a preset charging strategy according to the current residual capacity;
S12, calculating a temperature change value of each remaining charging stage, and determining a temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each remaining charging stage;
s13, calculating a first predicted charging duration when the temperature peak value is greater than or equal to a preset temperature threshold value; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
s14, calculating the charged capacity of the vehicle battery in the first predicted charging duration according to the charging current of each remaining charging stage and the first predicted charging duration;
s15, calculating a second predicted charging duration according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
s16, adding the first predicted charging duration and the second predicted charging duration to obtain the predicted total charging duration of the vehicle.
It should be noted that, the vehicle charging time estimation method according to the embodiment of the present invention is generally executed by the battery management system (Battery Management System, BMS), and may also be executed by a newly added external device.
Specifically, the current residual electric quantity of the vehicle battery at the beginning of charging is obtained, and because the battery is generally accompanied with a complete charging strategy when the design is completed, a plurality of residual charging stages of the vehicle battery are determined according to the current residual electric quantity based on the preset charging strategy. Generally, in the case that the temperature of the charging stand does not exceed the preset temperature threshold, the charging process of the vehicle battery will be strictly performed according to the remaining charging stage.
Since the initial temperature of the charging seat and the heat generated by charging affect the real-time temperature of the charging seat in the charging process, the heat generated by charging is reduced in a down-flow manner under the condition that the real-time temperature exceeds the preset temperature threshold, and the charging is not strictly performed according to the rest charging period in the whole charging process, the total charging duration of the vehicle battery is prolonged under the condition, therefore, the total charging duration can not be affected by the temperature as long as the temperature peak is smaller than the preset temperature threshold by judging the temperature peak in the charging process, but the charging current can be changed if the temperature peak is larger than or equal to the preset temperature threshold, so that the total charging duration is prolonged. The temperature peak can be predicted by: the method comprises the steps of obtaining initial temperature of a charging seat of a vehicle, calculating a temperature change value of each remaining charging stage, calculating the temperature of each remaining charging stage according to the initial temperature and the temperature change value of each remaining charging stage, and determining a temperature peak value from the temperature.
When the temperature peak value is greater than or equal to a preset temperature threshold value, calculating a first predicted charging duration; the first predicted charging duration is a charging duration when the temperature of the charging seat reaches a preset temperature threshold value from an initial temperature. The vehicle battery is charged in strict accordance with the remaining charge phase during the first predicted charge period.
After the first predicted charging time period, the current needs to be adjusted because the temperature reaches the preset temperature threshold value, so that the heat generated by the current is reduced, and the influence on the service life caused by overhigh temperature of the charging seat is avoided. The total charging duration of the vehicle comprises a first predicted charging duration and a charging duration after current adjustment, and the charging duration is not only related to the current magnitude, but also related to the electric quantity required to be charged. The charging current of each remaining charging stage is multiplied by a first predicted charging duration, the electric quantity (charged capacity) of the vehicle battery charged in the first predicted charging duration is calculated, a second predicted charging duration is calculated according to the current remaining electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current, and the predicted charging total duration of the vehicle can be obtained by adding the first predicted charging duration to the second predicted charging duration.
When the temperature peak value is smaller than the preset temperature threshold value, the predicted total charging duration of the vehicle is equal to the sum of a plurality of charging durations corresponding to the residual charging phases.
Compared with the prior art, the embodiment of the invention can determine the remaining charging stage by acquiring the current remaining capacity of the vehicle battery, and further determine the temperature change of the charging device and the change of the charging current in the charging process, so that the charging duration is accurately estimated, the time is reasonably arranged by a user, 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; determining a plurality of remaining charging stages of the vehicle battery according to the current remaining power and a preset charging strategy, wherein the steps comprise the following steps of S111-S112:
s111, determining a current charging stage corresponding to the current residual electric quantity according to the current residual electric quantity based on a mapping relation between the preset residual electric quantity and the charging stage;
s112, determining a plurality of remaining charging phases of the vehicle battery according to the current charging phase.
Specifically, the charging strategy is an important part of the design of the battery, and is set when the design of the battery is completed, in general, the battery is charged according to the charging strategy, and the charging strategy is formulated by comprehensively considering various factors including the total charging capacity of the battery, the material of the battery (such as a lithium battery, and the lithium precipitation risk of the battery is increased when the charging rate is too high), and the like. For example, it includes 10 charging phases: d1, D2, D3, D4, D5, D6, D7, D8, D9, D10, each charging phase corresponds to the current remaining capacity of the battery: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, when the remaining amount of electricity in the vehicle is 40%, the corresponding charging phase is D4, and the remaining charging phases include D4, D5, D6, D7, D8, D9, and D10. Based on a preset mapping relation between the residual electric quantity and the charging phases, determining a current charging phase corresponding to the current residual electric quantity in a charging strategy according to the current residual electric quantity, and further determining a plurality of residual charging phases of the vehicle battery.
In one embodiment, the calculating of the temperature change value of each remaining charging stage 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, a charging current of each residual charging stage and a charging duration 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;
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.
Illustratively, take the first remaining charge phase as an example: multiplying a preset temperature change coefficient, a charging current of a first residual charging stage and a charging duration 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 duration 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 heat generation temperature change value is subtracted from the dissipated temperature change value to obtain the temperature change value in the first remaining charging stage. The temperature change value of other residual charging stage can be calculated in the same way as above The specific calculation formula of the temperature change value in the electric stage is delta T a ＝I a 2 t a k-K Heat dissipation t a The method comprises the steps of carrying out a first treatment on the surface of the Wherein DeltaT a A temperature change value indicating the a-th remaining charging stage, I a Charging current of a remaining charging phase, t a The charging duration of the a-th residual charging stage is represented, the number of the residual charging stages is n, a represents a positive integer which is more than 0 and less than or equal to n, K represents a temperature change coefficient, K Heat dissipation Indicating the heat dissipation factor.
In one embodiment, the temperature change coefficient in step S121 is obtained by including steps S1211 to S1212:
s1211, acquiring a preset test charging duration and a test temperature change value of the charging seat under a preset test charging current;
s1212, calculating a temperature change coefficient according to the preset test charging time length, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
Specifically, during the charging process of the vehicle battery, the heat generated by the charging seat is specifically: q=i 2 R delta t, wherein I is a preset test charging current, R is the equivalent internal resistance of the connection of the charging seat and the charging gun, and delta t is the preset test charging duration; the heat generated by the charging seat can cause the temperature of the charging seat to rise, and according to a specific heat capacity formula, the temperature of the charging seat can be obtained: delta T Temperature rise ＝Q/(CM)＝I 2 R Δt/(CM); wherein DeltaT Temperature rise For the temperature change value increased by heat, C is the equivalent specific heat capacity of the connection between the charging stand and the charging gun, M is the equivalent mass of the connection between the charging stand and the charging gun, and the temperature change coefficient k=R/(CM), then DeltaT Temperature rise ＝I 2 Delta tk can be obtained through a preset test, the starting temperature and the ending temperature of the test are obtained through a temperature sensor under the preset test charging time length and the preset charging current, and delta T is obtained by subtracting the starting temperature from the ending temperature Temperature rise According to DeltaT Temperature rise ＝I 2 Delta tk, the temperature change coefficient is calculated.
It should be noted that, for 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 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 test.
In one embodiment, the heat dissipation factor in step S122 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.
It is worth to say that the heat dissipation coefficient embodies the heat dissipation capability of the charging seat to a certain extent, the heat dissipation coefficients of the charging seat under different environment temperatures are different, and the mapping relation between the environment temperature and the heat dissipation coefficient can be obtained through the prior art.
In one embodiment, the calculating the first predicted charging duration in step S13 specifically includes:
and calculating a first predicted charging duration according to the initial temperature, the charging duration of each remaining charging stage, the temperature change value of each remaining charging stage and the preset temperature threshold.
Specifically, subtracting the initial temperature from a preset temperature threshold to obtain a total temperature change value; and determining the remaining charging phases with the temperature reaching a preset temperature threshold according to the total temperature change value and the temperature change value of each remaining charging phase, and combining the charging duration of each remaining charging phase to obtain a first predicted charging duration.
In one embodiment, the calculating the second predicted charging duration in step S15 according to the current remaining power, the charged capacity, the total charging capacity of the vehicle battery, and the preset cooling charging current specifically includes steps S151 to S152:
S151, subtracting the current residual electric quantity and the charged capacity from the total charge capacity of the vehicle battery to obtain a residual capacity to be charged;
and S152, dividing the remaining capacity to be charged by a preset cooling charging current to obtain a second predicted charging duration.
It is worth to say that, in the first predicted charging duration, the vehicle battery is charged according to a preset charging strategy during charging, and in the second predicted charging duration, the vehicle battery is charged with a cooling charging current.
In one embodiment, the reduced temperature charging current in step S152 is obtained by including steps S1521-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 balanced 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 charging current after a first predicted charging duration in the preset residual charging stage;
s1524, when the balance current is greater than or equal to the strategy current, taking the strategy current as the cooling charging current.
Specifically, the temperature change of the charging seat is determined by a heat generation temperature change value and a heat dissipation temperature change value, when the heat generation temperature change value is equal to the heat dissipation temperature change value, the temperature of the charging seat is kept unchanged, and according to a calculation formula I of the temperature change Balancing 2 Δtk-K Heat dissipation Δt=0, wherein I Balancing Representing the balance current, changing the temperature to 0, and calculating the balance current to beWherein K is Heat dissipation The current heat dissipation coefficient is represented, and k represents the temperature change coefficient; when the balance current is smaller than the preset strategy current, taking the balance current as the cooling charging current; when the balance current is greater than or equal to the strategy current, the strategy current is used as cooling charging current; the strategy current is a charging current after a first predicted charging duration in a preset residual charging stage.
It is worth to say that, when the strategy current is greater than the balance current, if the vehicle battery is charged according to the original strategy current, the temperature of the charging seat is continuously increased, so that in order to avoid overhigh temperature, the balance current with smaller current is adopted as the cooling charging current for charging; when the balance current is greater than or equal to the strategy current, the charging of the vehicle battery by the strategy current does not lead to the continuous rise of the temperature of the charging seat, and in general, the preset charging strategy is designed according to the self characteristics of the vehicle battery and is more suitable for battery charging, so that the strategy current is selected as the cooling charging current for charging.
According to the vehicle charging time prediction method provided by the embodiment of the invention, firstly, a plurality of remaining charging stages of the vehicle battery are predicted by acquiring the current remaining capacity of the vehicle battery, then, the temperature change value of each remaining charging stage is calculated, so that a temperature peak value is determined, then, when the temperature peak value is larger than a preset temperature threshold value, a first predicted charging time length from the initial temperature to the preset temperature threshold value of the charging seat is calculated, meanwhile, a second predicted charging time length is calculated according to the current remaining capacity, 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 current residual electric quantity of the vehicle battery is obtained to determine a plurality of residual charging stages, and further, the temperature change of the charging device and the change of the charging current in the charging process are determined, so that the charging duration is accurately estimated, the reasonable time arrangement of a user is facilitated, and the user experience is improved.
Referring to fig. 2, which is a block diagram illustrating a vehicle charging time estimation apparatus according to an embodiment of the present invention, a vehicle charging time estimation apparatus 10 includes:
The remaining charging stage determining module 11 is configured to obtain a current remaining power of the vehicle battery, and determine a plurality of remaining charging stages of the vehicle battery according to a preset charging policy according to the current remaining power;
a temperature peak value determining module 12 for calculating a temperature change value for each remaining charging stage and determining a temperature peak value according to an initial temperature of a charging stand of the vehicle and the temperature change value for each remaining charging stage;
a first predicted charging duration calculation module 13, configured to calculate a first predicted charging duration when the temperature peak value is greater than or equal to a preset temperature threshold value; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
a charged capacity calculation module 14 for calculating a charged capacity of the first predicted charge duration from the charge current and the first predicted charge duration for each remaining charge phase;
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 the vehicle battery, and a preset cooling charging current;
The vehicle charging time calculation module 16 is configured to add the first predicted charging time period and the second predicted charging time period to obtain a predicted total charging time period of the vehicle.
Specifically, the current residual electric quantity of the vehicle battery at the beginning of charging is obtained, and because the battery is generally accompanied with a complete charging strategy when the design is completed, a plurality of residual charging stages of the vehicle battery are determined according to the current residual electric quantity based on the preset charging strategy. Generally, in the case that the temperature of the charging stand does not exceed the preset temperature threshold, the charging process of the vehicle battery will be strictly performed according to the remaining charging stage.
Since the initial temperature of the charging seat and the heat generated by charging affect the real-time temperature of the charging seat in the charging process, the heat generated by charging is reduced in a down-flow manner under the condition that the real-time temperature exceeds the preset temperature threshold, and the charging is not strictly performed according to the rest charging period in the whole charging process, the total charging duration of the vehicle battery is prolonged under the condition, therefore, the total charging duration can not be affected by the temperature as long as the temperature peak is smaller than the preset temperature threshold by judging the temperature peak in the charging process, but the charging current can be changed if the temperature peak is larger than or equal to the preset temperature threshold, so that the total charging duration is prolonged. The temperature peak can be predicted by: the method comprises the steps of obtaining initial temperature of a charging seat of a vehicle, calculating a temperature change value of each remaining charging stage, calculating the temperature of each remaining charging stage according to the initial temperature and the temperature change value of each remaining charging stage, and determining a temperature peak value from the temperature.
When the temperature peak value is greater than or equal to a preset temperature threshold value, calculating a first predicted charging duration; the first predicted charging duration is a charging duration when the temperature of the charging seat reaches a preset temperature threshold value from an initial temperature. The vehicle battery is charged in strict accordance with the remaining charge phase during the first predicted charge period.
After the first predicted charging time period, the current needs to be adjusted because the temperature reaches the preset temperature threshold value, so that the heat generated by the current is reduced, and the influence on the service life caused by overhigh temperature of the charging seat is avoided. The total charging duration of the vehicle comprises a first predicted charging duration and a charging duration after current adjustment, and the charging duration is not only related to the current magnitude, but also related to the electric quantity required to be charged. The charging current of each remaining charging stage is multiplied by a first predicted charging duration, the electric quantity (charged capacity) of the vehicle battery charged in the first predicted charging duration is calculated, a second predicted charging duration is calculated according to the current remaining electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current, and the predicted charging total duration of the vehicle can be obtained by adding the first predicted charging duration to the second predicted charging duration.
When the temperature peak value is smaller than the preset temperature threshold value, the predicted total charging duration of the vehicle is equal to the sum of a plurality of charging durations corresponding to the residual charging phases.
Compared with the prior art, the embodiment of the invention can determine the remaining charging stage by acquiring the current remaining capacity of the vehicle battery, and further determine the temperature change of the charging device and the change of the charging current in the charging process, so that the charging duration is accurately estimated, the time is reasonably arranged by a user, and the user experience is improved.
In one embodiment, the remaining charging stage determination module 11 specifically includes:
the charging system comprises a current charging stage determining unit, a charging stage determining unit and a charging stage determining unit, wherein the current charging stage determining unit is used for 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;
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 the design of the battery, and is set when the design of the battery is completed, in general, the battery is charged according to the charging strategy, and the charging strategy is formulated by comprehensively considering various factors including the total charging capacity of the battery, the material of the battery (such as a lithium battery, and the lithium precipitation risk of the battery is increased when the charging rate is too high), and the like. For example, it includes 10 charging phases: d1, D2, D3, D4, D5, D6, D7, D8, D9, D10, each charging phase corresponds to the current remaining capacity of the battery: 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, when the remaining amount of electricity in the vehicle is 40%, the corresponding charging phase is D4, and the remaining charging phases include D4, D5, D6, D7, D8, D9, and D10. Based on a preset mapping relation between the residual electric quantity and the charging phases, determining a current charging phase corresponding to the current residual electric quantity in a charging strategy according to the current residual electric quantity, and further determining a plurality of residual charging phases of the vehicle battery.
In one embodiment, the temperature peak determination module 12 specifically includes:
the heat generation temperature change value calculation unit is used for calculating the 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 duration 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 duration of each residual charging stage;
and the temperature change value calculation 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.
Illustratively, take the first remaining charge phase as an example: multiplying a preset temperature change coefficient, a charging current of a first residual charging stage and a charging duration 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 duration 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 heat generation temperature change value is subtracted from the dissipated temperature change value to obtain the temperature change value in the first remaining charging stage. The temperature change values of other remaining charging stages can be calculated in the same manner as above, and the specific calculation formula of the temperature change values of the remaining charging stages is DeltaT a ＝I a 2 t a k-K Heat dissipation t a The method comprises the steps of carrying out a first treatment on the surface of the Wherein DeltaT a A temperature change value indicating the a-th remaining charging stage, I a Charging current of a remaining charging phase, t a The charging duration of the a-th residual charging stage is represented, the number of the residual charging stages is n, a represents a positive integer which is more than 0 and less than or equal to n, K represents a temperature change coefficient, K Heat dissipation Indicating the heat dissipation factor.
In one embodiment, the heat generation temperature variation value calculation unit further includes:
the test temperature change value acquisition subunit is used for acquiring a preset test charging duration 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 a temperature change coefficient according to the preset test charging time length, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
Specifically, during the charging process of the vehicle battery, the heat generated by the charging seat is specifically: q=i 2 R delta t, wherein I is a preset test charging current, R is the equivalent internal resistance of the connection of the charging seat and the charging gun, and delta t is the preset test charging duration; the heat generated by the charging seat can cause the temperature of the charging seat to rise, and according to a specific heat capacity formula, the temperature of the charging seat can be obtained: delta T Temperature rise ＝Q/(CM)＝I 2 R Δt/(CM); wherein DeltaT Temperature rise For the temperature change value increased by heat, C is the equivalent specific heat capacity of the connection between the charging stand and the charging gun, M is the equivalent mass of the connection between the charging stand and the charging gun, and the temperature change coefficient k=R/(CM), then DeltaT Temperature rise ＝I 2 Delta tk can be obtained through a preset test, the starting temperature and the ending temperature of the test are obtained through a temperature sensor under the preset test charging time length and the preset charging current, and delta T is obtained by subtracting the starting temperature from the ending temperature Temperature rise According to DeltaT Temperature rise ＝I 2 Delta tk, the temperature change coefficient is calculated.
It should be noted that, for 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 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 test.
In one embodiment, the heat dissipation temperature change value calculating unit is further configured to obtain a current ambient temperature, and determine, according to the current ambient temperature, a current heat dissipation coefficient corresponding to the current ambient temperature based on a preset mapping relationship between the ambient temperature and the heat dissipation coefficient.
It is worth to say that the heat dissipation coefficient embodies the heat dissipation capability of the charging seat to a certain extent, the heat dissipation coefficients of the charging seat under different environment temperatures are different, and the mapping relation between the environment temperature and the heat dissipation coefficient can be obtained through the prior art.
In one embodiment, the first predicted charging duration calculation module is specifically configured to calculate a first predicted charging duration according to the initial temperature, the charging duration of each remaining charging stage, the temperature change value of each remaining charging stage, and the preset temperature threshold.
Specifically, subtracting the initial temperature from a preset temperature threshold to obtain a total temperature change value; and determining the remaining charging phases with the temperature reaching a preset temperature threshold according to the total temperature change value and the temperature change value of each remaining charging phase, and combining the charging duration of each remaining charging phase to obtain a first predicted charging duration.
In one embodiment, the second predicted charge duration calculation module 15 specifically includes:
the remaining capacity to be charged calculation unit is used for subtracting the current remaining capacity and the charged capacity from the total charging capacity of the vehicle battery to obtain remaining capacity to be charged;
And the second predicted charging duration calculation unit is used for dividing the remaining capacity to be charged by a preset cooling charging current to obtain a second predicted charging duration.
It is worth to say that, in the first predicted charging duration, the vehicle battery is charged according to a preset charging strategy during charging, and in the second predicted charging duration, the vehicle battery is charged with a cooling charging current.
In one embodiment, the second predicted charge duration calculation unit further includes:
a current parameter calculation subunit, configured to divide the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
the balance current calculation subunit is used for carrying out evolution operation on the current parameters to obtain balance current;
the cooling charging current determining subunit is used for taking the balance current as cooling charging current when the balance current is smaller than a preset strategy current; the strategy current is a charging current after a first predicted charging duration in the preset residual charging stage;
and the cooling charging current determining subunit is further used for taking the strategy current as 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 determined by a heat generation temperature change value and a heat dissipation temperature change value, when the heat generation temperature change value is equal to the heat dissipation temperature change value, the temperature of the charging seat is kept unchanged, and according to a calculation formula I of the temperature change Balancing 2 Δtk-K Heat dissipation Δt=0, wherein I Balancing Representing the balance current, changing the temperature to 0, and calculating the balance current to beWherein K is Heat dissipation The current heat dissipation coefficient is represented, and k represents the temperature change coefficient; when the balance current is smaller than the preset strategy current, taking the balance current as the cooling charging current; when the balance current is greater than or equal to the strategy current, the strategy current is used as cooling charging current; the strategy current is a charging current after a first predicted charging duration in a preset residual charging stage.
It is worth to say that, when the strategy current is greater than the balance current, if the vehicle battery is charged according to the original strategy current, the temperature of the charging seat is continuously increased, so that in order to avoid overhigh temperature, the balance current with smaller current is adopted as the cooling charging current for charging; when the balance current is greater than or equal to the strategy current, the charging of the vehicle battery by the strategy current does not lead to the continuous rise of the temperature of the charging seat, and in general, the preset charging strategy is designed according to the self characteristics of the vehicle battery and is more suitable for battery charging, so that the strategy current is selected as the cooling charging current for charging.
According to the vehicle charging time estimating device 10 provided by the embodiment of the invention, firstly, a plurality of remaining charging stages of the vehicle battery are predicted by acquiring the current remaining capacity of the vehicle battery, then, a temperature peak value is determined by calculating the temperature change value of each remaining charging stage, then, when the temperature peak value is larger than a preset temperature threshold value, a first predicted charging time length from the initial temperature to the preset temperature threshold value of the charging seat is calculated, meanwhile, a second predicted charging time length is calculated according to the current remaining capacity, 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 current residual electric quantity of the vehicle battery is obtained to determine a plurality of residual charging stages, and further, the temperature change of the charging device and the change of the charging current in the charging process are determined, so that the charging duration is accurately estimated, the reasonable time arrangement of a user is facilitated, and the user experience is improved.
It should be noted that, the specific working process of the vehicle charging time estimation device 10 may refer to the working process of the vehicle charging time estimation method in the above embodiment, and will not be described herein.
Referring to fig. 3, a vehicle charging time estimation device 20 according to 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 implements steps in the embodiment of the vehicle charging time estimation method, such as steps S11 to S16 described in fig. 1, when executing the computer program; alternatively, the processor 21, when executing the computer program, implements the functions of the modules in the above-described device embodiments, such as the remaining charge phase determination module 11.
Illustratively, the computer program may be split into one or more modules that are stored in the memory 22 and executed by the processor 21 to complete the present invention. The one or more modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program in the vehicle charge time estimation device 20. For example, the computer program may be divided into a remaining charge phase determination module 11, a temperature peak determination module 12, a first predicted charge duration calculation module 13, a charged capacity calculation module 14, a second predicted charge duration calculation module 15, and a vehicle charge time calculation module 16, each of which functions specifically as follows:
The remaining charging stage determining module 11 is configured to obtain a current remaining power of the vehicle battery, and determine a plurality of remaining charging stages of the vehicle battery according to a preset charging policy according to the current remaining power;
a temperature peak value determining module 12 for calculating a temperature change value for each remaining charging stage and determining a temperature peak value according to an initial temperature of a charging stand of the vehicle and the temperature change value for each remaining charging stage;
a first predicted charging duration calculation module 13, configured to calculate a first predicted charging duration when the temperature peak value is greater than or equal to a preset temperature threshold value; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
a charged capacity calculation module 14 for calculating a charged capacity of the first predicted charge duration from the charge current and the first predicted charge duration for each remaining charge phase;
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 the vehicle battery, and a preset cooling charging current;
The vehicle charging time calculation module 16 is configured to add the first predicted charging time period and the second predicted charging time period to obtain a predicted total charging time period of the vehicle.
The specific operation process of each module may refer to the operation process of the vehicle charging time estimation device 10 described in the foregoing embodiment, and will not be described herein.
The vehicle charging time estimation device 20 may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The vehicle charge time estimation device 20 may include, but is not limited to, a processor 21, a memory 22. It will be appreciated by those skilled in the art that the schematic diagram is merely an example of a 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 illustrated, or may combine certain 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, and the like.
The processor 21 may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, and the processor 21 is a control center of the vehicle charge time estimating apparatus 20, and connects various parts of the entire vehicle charge time estimating apparatus 20 using various interfaces and lines.
The memory 22 may be used to store the computer program and/or module, and the processor 21 may implement various functions of the vehicle charge time estimation device 20 by executing or executing the computer program and/or module stored in the memory 22 and invoking data stored in the memory 22. The memory 22 may mainly include a storage program area and a storage data area, wherein the storage program 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, etc. In addition, the memory 22 may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
The module integrated with the vehicle charge time estimation device 20 may be stored in a computer readable storage medium if implemented as a software functional unit and sold or used as a separate product. Based on such understanding, the present invention may implement all or part of the flow of the method of the above embodiment, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of each of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
Those skilled in the art will appreciate that implementing all or part of the above-described methods in accordance with the embodiments may be accomplished by way of a computer program stored on a computer readable storage medium, which when executed may comprise the steps 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 (Random Access Memory, RAM), or the like.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
1. A vehicle charge time estimation method, comprising:
acquiring the current residual electric quantity of a vehicle battery, and determining a plurality of residual charging stages of the vehicle battery according to a preset charging strategy according to the current residual electric quantity;
calculating a temperature change value of each remaining charging stage, and determining a temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each remaining charging stage;
When the temperature peak value is greater than or equal to a preset temperature threshold value, calculating a first predicted charging duration; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
calculating the charged capacity of the vehicle battery in the first predicted charging duration according to the charging current of each remaining charging stage and the first predicted charging duration;
calculating a second predicted charging duration according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
adding the first predicted charging duration and the second predicted charging duration to obtain a predicted total charging duration of the vehicle;
the cooling charging current is obtained by the following steps:
dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
performing evolution operation on the current parameters to obtain balanced 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 charging current after a first predicted charging duration in the preset 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.
2. The vehicle charge time estimation method of claim 1, wherein the charge strategy is: a plurality of charging stages divided in advance according to the total charging capacity; and determining a plurality of remaining charging stages of the vehicle battery according to the current remaining power and a preset charging strategy, wherein the steps specifically comprise:
determining a current charging stage corresponding to the current residual electric quantity according to the current residual electric quantity based on a mapping relation between the preset residual electric quantity and the charging stage;
and determining a plurality of remaining charging phases of the vehicle battery according to the current charging phase.
3. The vehicle charge time estimation method according to claim 1, wherein the calculating of the temperature change value for each remaining charge phase specifically includes:
calculating a heat generation temperature change value of each residual charging stage according to a preset temperature change coefficient, a charging current of each residual charging stage and a charging duration of each residual charging stage;
according to a preset heat dissipation coefficient and the charging duration of each residual charging stage, calculating a heat dissipation temperature change value 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 mapping relation between a preset environment temperature and the heat dissipation coefficient according to the current environment temperature;
the temperature change coefficient is obtained by:
acquiring a preset test charging duration 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 length, the preset test charging current, the test temperature change value and the current heat dissipation coefficient.
5. The vehicle charge time estimation method according to claim 3, wherein the calculating the first predicted charge time period specifically includes:
and calculating a first predicted charging duration according to the initial temperature, the charging duration of each remaining charging stage, the temperature change value of each remaining charging stage and the preset temperature threshold.
6. The vehicle charging time estimation method according to claim 3, wherein the calculating the second predicted charging time period according to the present remaining power, the charged capacity, the total charging capacity of the vehicle battery, and the preset cooling charging current specifically includes:
subtracting the current residual electric quantity and the charged capacity from the total charge capacity of the vehicle battery to obtain a residual capacity to be charged;
and dividing the remaining capacity to be charged by a preset cooling charging current to obtain a second predicted charging duration.
7. A vehicle charge time estimation apparatus, characterized by comprising:
the vehicle battery charging system comprises a residual charging stage determining module, a charging stage determining module and a charging stage determining module, wherein the residual charging stage determining module is used for obtaining the current residual electric quantity of a vehicle battery and determining a plurality of residual charging stages of the vehicle battery according to a preset charging strategy according to the current residual electric quantity;
the temperature peak value determining module is used for calculating a temperature change value of each remaining charging stage and determining a temperature peak value according to the initial temperature of a charging seat of the vehicle and the temperature change value of each remaining charging stage;
the first predicted charging duration calculation module is used for calculating a first predicted charging duration when the temperature peak value is greater than or equal to a preset temperature threshold value; the first predicted charging duration is a charging duration from the initial temperature to the preset temperature threshold of the charging seat;
The charged capacity calculation module is used for calculating the charged capacity of the first predicted charging duration according to the charging current of each residual charging stage and the first predicted charging duration;
the second predicted charging duration calculation module is used for calculating a second predicted charging duration according to the current residual electric quantity, the charged capacity, the total charging capacity of the vehicle battery and a preset cooling charging current;
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;
the second predicted charging duration calculation module is further configured to:
dividing the heat dissipation coefficient by the temperature change coefficient to obtain a current parameter;
performing evolution operation on the current parameters to obtain balanced 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 charging current after a first predicted charging duration in the preset 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 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 any one of claims 1-6 when executing the computer program.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored computer program, wherein the computer program, when run, controls a device in which the computer readable storage medium is located to perform the vehicle charging time estimation method according to any one of claims 1-6.
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| CN115092001B (en) * | 2022-04-28 | 2023-08-04 | 芜湖宏景电子股份有限公司 | Electric automobile charging assembly temperature monitoring system |
| CN115158097B (en) * | 2022-09-02 | 2022-11-15 | 南京金维鸟智能***股份有限公司 | Charging pile management method and system based on Internet of things and storage medium |
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