CN111382524B - Method and device for calculating pure cooling remaining time of charging of power battery, vehicle and storage medium - Google Patents
Method and device for calculating pure cooling remaining time of charging of power battery, vehicle and storage medium Download PDFInfo
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- CN111382524B CN111382524B CN202010200179.0A CN202010200179A CN111382524B CN 111382524 B CN111382524 B CN 111382524B CN 202010200179 A CN202010200179 A CN 202010200179A CN 111382524 B CN111382524 B CN 111382524B
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Abstract
The embodiment of the invention relates to a method and a device for calculating pure cooling remaining time of charging of a power battery, a vehicle and a storage medium, wherein the method for calculating the pure cooling remaining time of charging of the power battery comprises the following steps: acquiring the temperature of a power battery; acquiring an ambient temperature; acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature; and taking the pure cooling basic time as the pure cooling residual time for charging the power battery. By the method disclosed by the embodiment of the invention, in the process of pure cooling in charging, the factors such as the battery temperature, the environment temperature and the like are fully considered, and the pure cooling remaining time of the power battery in charging can be accurately calculated.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a method and a device for calculating pure cooling remaining time of charging of a power battery, a vehicle and a storage medium.
Background
The pure electric vehicles are paid more attention to environmental protection, energy conservation and the like, and the use of the national support electric vehicles is gradually popularized along with the continuous progress of technology in recent years. Because of the dynamic requirement of the driving range, the electric automobile in the current market mostly uses high-capacity and high-power lithium iron phosphate or ternary material power batteries, and the safety of the lithium ion battery is greatly improved compared with that of a metal lithium battery, but the lithium ion battery used as a power source for the automobile still has a plurality of potential safety hazards under the high-temperature condition. The lithium ion battery has poor charging and discharging capabilities in a high-temperature environment and cannot meet the requirements of charging performance and efficiency or the requirements of drivability due to the limitation of battery material factors and the consideration of vehicle safety. The overlong waiting time of charging greatly influences the use experience of users, and is also a factor of great concern when customers select electric vehicles on the market.
When the lithium ion battery is used under high temperature conditions, the heat released by the lithium ion battery to the environment is less than the heat released when the temperature is lower, if the heat generated by exothermic reaction is not counteracted by heat loss of the environment, the heat generation speed exceeds the heat dissipation speed to the environment, heat accumulation can occur, and the temperature of the battery is further driven to rise, so that the lithium ion battery is in a very dangerous state. The life and performance of a high Wen Shili ion battery can also be affected by reactions occurring, a solid electrolyte interphase layer (SEI layer) is a thin layer formed on a graphite anode, decomposition occurs at a higher temperature, lithium ions which can be repeatedly charged and discharged in the battery can be consumed by the reactions, and the battery capacity is greatly reduced, so that charging is not allowed when the temperature is higher than 40-50 ℃ and discharging is not allowed when the temperature is higher than 60-70 ℃ in order to ensure the life and performance of the power battery.
In summer, the highest air temperature in the southern area of China can reach about 40 ℃, and the surface temperature of the asphalt ground can even reach 50 ℃ due to sunlight irradiation and heat absorption, so that the electric automobile can be charged or driven in the summer outdoor environment, and the electric automobile is usually provided with a thermal management system for cooling the battery. The battery is cooled to a temperature allowing charging or running and then the charging or driving operation of the whole vehicle is carried out.
Disclosure of Invention
The embodiment of the invention discloses a method and a device for calculating pure cooling remaining time of charging of a power battery, a vehicle and a storage medium.
The embodiment of the invention discloses a method for calculating pure cooling remaining time of charging of a power battery, which comprises the following steps:
acquiring the temperature of a power battery;
acquiring an ambient temperature;
acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature;
and taking the pure cooling basic time as the pure cooling residual time for charging the power battery.
The second aspect of the embodiment of the invention discloses a power battery charging pure cooling remaining time calculating device, which comprises:
the power battery temperature acquisition module is used for acquiring the temperature of the power battery;
the environment temperature acquisition module is used for acquiring the environment temperature;
the pure cooling basic time acquisition module is used for acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature;
the charger output power acquisition module is used for acquiring the output power of the charger;
the load consumption power acquisition module is used for acquiring load consumption power;
the air conditioner power acquisition module is used for acquiring the air conditioner power;
the air conditioner cooling coefficient calculation module is used for calculating an air conditioner cooling coefficient according to the output power, the load consumption power and the air conditioner power;
and the power battery charging pure cooling residual time calculation module is used for calculating the product of the pure cooling basic time and the air conditioner cooling coefficient to be used as the power battery charging pure cooling residual time.
A third aspect of the embodiment of the present invention discloses a vehicle, which includes the power battery charging pure cooling remaining time calculating device of the second aspect of the embodiment of the present invention.
A fourth aspect of the embodiment of the present invention discloses a computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the method for calculating the pure cooling remaining time for charging a power battery disclosed in the first aspect of the embodiment of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: by the method disclosed by the embodiment of the invention, in the process of pure cooling in charging, the factors such as the battery temperature, the environment temperature and the like are fully considered, and the pure cooling remaining time of the power battery in charging can be accurately calculated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for calculating pure cooling remaining time for charging a power battery according to an embodiment of the present invention;
FIG. 1A is a flow chart of a method for obtaining pure cooling base time according to an embodiment of the invention;
FIG. 1B is a graphical representation of the correspondence between battery temperature and battery temperature-related cooling time in an embodiment of the present invention;
FIG. 1C is a graph showing the correspondence between the environmental temperature and the environmental temperature influence coefficient according to the embodiment of the present invention;
FIG. 2 is a schematic block diagram of a power battery charging pure cooling remaining time calculation device according to an embodiment of the present invention;
FIG. 2A is a schematic diagram of a pure cooling base time acquisition module in accordance with 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.
It should be noted that the terms "first," "second," "third," and "fourth," etc. in the description and claims of the present invention are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
The lithium ion power battery of the electric vehicle has a service environment which does not allow charging at a high temperature, but the battery needs to be charged at the moment, so that the temperature of the power battery needs to be cooled to the temperature allowing charging, and the time of the process can be called as the charging pure cooling time. The upper limit of the temperature of the battery that is allowed to be charged may be, for example, 40 ℃, i.e., cooling is required when the temperature of the power battery exceeds 40 ℃.
The following factors need to be considered in estimating the charge pure cooling time:
1. the higher the temperature of the power cell itself, in particular, the longer the time required for pure cooling of the charge.
2. The power battery is at an ambient temperature, and it can be understood that even though the temperature of the power battery is the same, the power battery can have different cooling times when in different ambient temperatures, and the higher the ambient temperature, the longer the pure cooling time.
3. The degree of loading of the cooling device is understood to be the shorter the pure cooling time if the cooling device is operated at full load and the longer the pure cooling time if it is not operated at full load. The cooling device for cooling the power battery is usually an air conditioner, the air conditioner has a large power, and then the load level of the air conditioner is mainly affected by the following two factors:
A. the charging method generally has different maximum output current values, for example, 10A, 16A, 32A, 63A, etc., due to different specifications of the cable capacity of the charging gun at the time of ac charging, etc., and the maximum charging power corresponding to the current values can be calculated and obtained to be 2.2KW, 3.52KW, 7.04KW, 13.86KW, respectively, based on the voltage at the ac output terminal of 220V. The output power of the direct current charging mode is usually more than or equal to 20KW.
As can be seen from the above description, if the maximum charging power is smaller than the power of the air conditioner, the air conditioner is caused to operate in a non-full load state, and the cooling time is also increased.
B. The load consumed power in the pure cooling process consumes the output power of part of the charger when other loads of the whole vehicle are started in the charging pure cooling process, and if the output power of the charger cannot simultaneously meet the other loads and the air conditioner load for cooling the battery, the actual power obtained by the air conditioner is reduced.
In some embodiments of the present invention, the charging pure cooling time may be calculated by the temperature of the power battery and the ambient temperature, and the charging pure cooling time may also be calculated by further increasing the load level of the cooling device.
In each specific embodiment of a method for calculating pure cooling remaining time for charging a power battery according to the embodiments of the present invention, the pure cooling remaining time for charging a power battery is obtained according to factors such as a power battery temperature and a power battery ambient temperature, and the pure cooling time for charging may be calculated by further considering a load degree of a cooling device, which will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a method for calculating pure cooling remaining time for charging a power battery according to an embodiment of the invention, including:
101. acquiring the temperature of a power battery;
102. acquiring an ambient temperature;
103. acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature;
in an embodiment of the present invention, the pure cooling base time may also be denoted as PuT.
According to the foregoing description, the power battery temperature and the ambient temperature are basic factors that affect the pure cooling remaining time of the charging of the power battery, and in the embodiment of the present invention, the pure cooling base time may be obtained according to the power battery temperature and the ambient temperature, where the pure cooling base time is a base of calculating the pure cooling remaining time of the charging, and various methods for specifically obtaining the pure cooling base time may be used, which will be exemplified below.
A mode one,
Obtained from a look-up table in a pre-calibrated pure cooling base schedule relating to ambient temperature, battery temperature.
One of the pure cooling base schedules is in the form:
after the battery temperature and the ambient temperature are determined, the pure cooling base time can be obtained by looking up a table.
A specific method of establishing a pure cooling base schedule related to ambient temperature, battery temperature may be, for example:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 50 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time of a battery from the beginning of cooling to the end of charging and pure cooling, and recording the temperature points and time of each battery in the process, wherein in the method, the difference between the temperature points of the battery can be smaller, for example, can be 1 ℃;
establishing a corresponding table of battery temperature and battery temperature associated cooling time under a set environment temperature (50 ℃) according to the recorded battery temperature points and time;
the specific form of the table of the battery temperature and the battery temperature associated cooling time at the set ambient temperature is as follows:
and then changing the temperature of the environment bin, repeating the process, and obtaining a corresponding table of the battery temperature and the battery temperature associated cooling time at each environment temperature of 49 ℃, 48 ℃ and the like.
The collection of individual temperature schedules obtained above constitutes the pure cooling base schedule in relation to ambient temperature, battery temperature.
A second mode,
Fig. 1A is a schematic flow chart of a pure cooling basic time acquisition method according to an embodiment of the invention, including:
a11, acquiring battery temperature associated cooling time corresponding to the battery temperature according to a preset corresponding relation between the battery temperature and the battery temperature associated cooling time;
in an embodiment of the present invention, the battery temperature-dependent cooling time may also be denoted as RfT.
A specific method for establishing the correspondence between the battery temperature and the battery temperature-related cooling time may, for example, include:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 50 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
the vehicle is inserted into a direct current charging gun for charging and pure cooling, the battery temperature and time from the beginning of cooling to the end of charging and pure cooling are recorded, and the temperature points and time of each battery in the process are recorded, wherein the difference between the temperature points of the battery can be larger, for example, the temperature can be 5 ℃;
establishing a corresponding table of battery temperature and battery temperature associated cooling time according to the recorded temperature points and time;
the specific form of the table of the battery temperature and the battery temperature associated cooling time is as follows:
establishing a coordinate axis, taking the battery temperature and the cooling time in the table as an abscissa and an ordinate respectively, taking recorded data as points in the coordinate axis to be expressed in the coordinate axis, and connecting all adjacent points by a linear interpolation method to obtain a corresponding curve of the battery temperature and the cooling time point. And taking the curve as the corresponding relation between the battery temperature and the battery temperature-related cooling time. Fig. 1B is a schematic diagram of a correspondence relationship between battery temperature and battery temperature-related cooling time in an embodiment of the invention.
When the battery temperature is determined, the battery temperature-related cooling time may be obtained according to the above-described curve representing the correspondence between the battery temperature and the battery temperature-related cooling time.
It will be appreciated that, the above takes the ambient temperature of 50 ℃ as the reference temperature, the correspondence between the battery temperature and the battery temperature-related cooling time obtained at this time is taken as the reference correspondence between the battery temperature and the battery temperature-related cooling time, and the cooling time is obtained by calibrating the ambient temperature-related ambient temperature influence coefficient with different ambient temperatures.
A12, acquiring an environmental temperature influence coefficient related to the environmental temperature according to a preset corresponding relation between the environmental temperature and the environmental temperature influence coefficient;
in the embodiment of the invention, the environmental temperature influence coefficient may also be expressed as EnF.
A specific method for establishing a correspondence between an ambient temperature and an ambient temperature influence coefficient may, for example, include:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 45 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time from the beginning of cooling to the end of charging and pure cooling, and recording each temperature point and time in the process;
establishing a corresponding table of battery temperature and battery temperature associated cooling time when the ambient temperature is 45 ℃ according to the recorded temperature points and time;
then the correspondence table of the battery temperature and the battery temperature-associated cooling time may be, for example, when the ambient temperature is 45 ℃:
the above process is repeated, and only the temperature of the environmental chamber in the step of putting the vehicle again in the environmental chamber is changed, in the above example, to 45 c, and it is also necessary to change the temperature to 40 c, 35 c, and 30 c, respectively. Establishing a corresponding table of battery temperature and battery temperature associated cooling time under each environmental bin temperature;
taking the environmental chamber temperature of 50 ℃ as a reference, acquiring the environmental temperature influence coefficients when the environmental chamber temperature is 45 ℃, 40 ℃, 35 ℃ and 30 ℃ respectively, wherein the specific acquisition method comprises the following steps: for example, in the case where the ambient temperature is 45 ℃, the cooling time of the battery temperature at each point is compared with the cooling time of the same temperature when the ambient temperature is 50 ℃, and then the average of the ratio is calculated as the ambient temperature influence coefficient when the ambient temperature is 45 ℃.
Still taking the environment temperature of 45 ℃ as an example, the specific calculation method of the environment temperature influence coefficient at the moment is as follows:
ambient temperature 45 ℃ ambient temperature influence coefficient= ((T45-1)/(T50-1) + (T45-2)/(T50-2) + (T45-3)/(T50-3) + (T45-4)/(T50-4) + (T45-5)/(T50-5) + (T45-6)/(T50-6))/6
Establishing a coordinate axis, taking the environmental temperature influence coefficient of the environmental temperature (such as 45 ℃, 40 ℃, 35 ℃ and 30 ℃) corresponding to the environmental temperature as an abscissa and an ordinate respectively, taking the calculated data as points in the coordinate axis to be represented in the coordinate axis, and connecting all adjacent points by a linear interpolation method to obtain a corresponding curve of the environmental temperature and the environmental temperature influence coefficient. And taking the curve as the corresponding relation between the ambient temperature and the ambient temperature influence coefficient.
Fig. 1C is a schematic diagram showing a correspondence relationship between an ambient temperature and an ambient temperature influence coefficient in an embodiment of the present invention.
After the ambient temperature is determined, the battery temperature-related cooling time can be obtained according to the curve representing the corresponding relationship between the ambient temperature and the ambient temperature influence coefficient.
A13, calculating the product of the battery temperature-related cooling time and the environmental temperature influence coefficient to serve as pure cooling basic time;
that is, calculation: puT = RfT ×enf;
wherein, the liquid crystal display device comprises a liquid crystal display device,
PuT is the pure cool base time;
RfT is the battery temperature-dependent cooling time;
EnF is the environmental temperature influence coefficient;
in some embodiments of the present invention, the above pure cooling base time may be used as the power battery charging pure cooling remaining time, while in some other embodiments, the effect of the load level of the cooling device on the pure cooling remaining time may be further considered, as described in detail below.
104. Obtaining output power of a charger;
a specific way to obtain the output power of the charger may be, for example:
the BMS judges that the current charging mode is AC charging, and the BMS detects the resistance value of a pull-down resistor of a charging gun head of an AC charging port to obtain the output power of the charger during AC charging, and the judging method is as follows:
the pull-down resistor is 1.5KΩ, the cable capacity of the charging gun is 10A, and the cable capacity of the charging gun is 2.2KW;
pull down resistor 680 Ω, charging gun cable capacity 16A, charging gun cable capacity 3.52KW;
pull down resistor 220 Ω, charging gun cable capacity 32A, charging gun cable capacity 7.04KW;
pull down resistor 100 Ω, charging gun cable capacity 63A, charging gun cable capacity 11KW;
the cable capacity of the charging gun is output power;
BMS judges that the current charging mode is direct current charging, and the output power is more than or equal to 20KW;
in the embodiment of the invention, the output power of the charger can also be expressed as ChrgP.
105. Acquiring load consumption power;
in the embodiment of the present invention, the load consumption power may also be expressed as LoadP.
106. Acquiring the power of an air conditioner;
in the embodiment of the invention, the air conditioning power may also be denoted as ACP.
107. Calculating an air conditioner cooling coefficient according to the output power, the load consumption power and the air conditioner power;
in the embodiment of the invention, the cooling coefficient of the air conditioner can be obtained by comparing the power of the air conditioner with the power which can be obtained by the air conditioner; the specific calculation mode is as follows:
ACF＝ACP/(ChrgP-LoadP)；
wherein, the liquid crystal display device comprises a liquid crystal display device,
ACF is the cooling coefficient of the air conditioner; and the ACF value range is ACF is more than or equal to 1, and if the ACF is less than 1, ACF=1 is taken;
ACP is the air conditioner power;
ChrgP is the charger output power;
LoadP is load power consumption
108. And calculating the product of the pure cooling basic time and the air conditioner cooling coefficient to be used as the pure cooling residual time for charging the power battery.
The specific calculation mode is as follows:
ChrgCoolT＝PuT*ACF
wherein, the liquid crystal display device comprises a liquid crystal display device,
the ChrgCoolT is the pure cooling residual time for charging the power battery;
PuT is the pure cool base time;
ACF is the air conditioner cooling coefficient.
By the method disclosed by the embodiment of the invention, in the process of pure cooling in charging, the factors such as the battery temperature, the environment temperature and the like are fully considered, and the pure cooling remaining time of the power battery in charging can be accurately calculated.
Furthermore, the embodiment of the invention can also combine the influence of factors such as output power of a charger, load consumption power, air conditioner power and the like on battery cooling, and correct the result of calculating the pure cooling remaining time of the charging of the power battery, so that the calculation result is more in line with the actual situation.
Fig. 2 is a schematic block diagram of a power battery charging pure cooling remaining time calculating device according to an embodiment of the invention, including:
a power battery temperature acquisition module 201 for acquiring a power battery temperature;
an ambient temperature acquisition module 202 that acquires an ambient temperature;
a pure cooling base time obtaining module 203, configured to obtain a pure cooling base time according to the power battery temperature and the ambient temperature;
in an embodiment of the present invention, the pure cooling base time may also be denoted as PuT.
According to the foregoing description, the power battery temperature and the ambient temperature are basic factors that affect the pure cooling remaining time of the charging of the power battery, and in the embodiment of the present invention, the pure cooling base time may be obtained according to the power battery temperature and the ambient temperature, where the pure cooling base time is a base of calculating the pure cooling remaining time of the charging, and various methods for specifically obtaining the pure cooling base time may be used, which will be exemplified below.
A mode one,
Obtained from a look-up table in a pre-calibrated pure cooling base schedule relating to ambient temperature, battery temperature.
One of the pure cooling base schedules is in the form:
/>
after the battery temperature and the ambient temperature are determined, the pure cooling base time can be obtained by looking up a table.
A specific method of establishing a pure cooling base schedule related to ambient temperature, battery temperature may be, for example:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 50 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time of a battery from the beginning of cooling to the end of charging and pure cooling, and recording the temperature points and time of each battery in the process, wherein in the method, the difference between the temperature points of the battery can be smaller, for example, can be 1 ℃;
establishing a corresponding table of battery temperature and battery temperature associated cooling time under a set environment temperature (50 ℃) according to the recorded battery temperature points and time;
the specific form of the table of the battery temperature and the battery temperature associated cooling time at the set ambient temperature is as follows:
and then changing the temperature of the environment bin, repeating the process, and obtaining a corresponding table of the battery temperature and the battery temperature associated cooling time at each environment temperature of 49 ℃, 48 ℃ and the like.
The collection of individual temperature schedules obtained above constitutes the pure cooling base schedule in relation to ambient temperature, battery temperature.
A second mode,
Fig. 2A is a schematic diagram of a pure cooling base time acquisition module according to an embodiment of the present invention, including:
a21, a battery temperature related cooling time acquisition module, which is used for acquiring battery temperature related cooling time corresponding to the battery temperature according to a preset corresponding relation between the battery temperature and the battery temperature related cooling time;
in an embodiment of the present invention, the battery temperature-dependent cooling time may also be denoted as RfT.
A specific method for establishing the correspondence between the battery temperature and the battery temperature-related cooling time may, for example, include:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 50 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
the vehicle is inserted into a direct current charging gun for charging and pure cooling, the battery temperature and time from the beginning of cooling to the end of charging and pure cooling are recorded, and the temperature points and time of each battery in the process are recorded, wherein the difference between the temperature points of the battery can be larger, for example, the temperature can be 5 ℃;
establishing a corresponding table of battery temperature and battery temperature associated cooling time according to the recorded temperature points and time;
the specific form of the table of the battery temperature and the battery temperature associated cooling time is as follows:
/>
establishing a coordinate axis, taking the battery temperature and the cooling time in the table as an abscissa and an ordinate respectively, taking recorded data as points in the coordinate axis to be expressed in the coordinate axis, and connecting all adjacent points by a linear interpolation method to obtain a corresponding curve of the battery temperature and the cooling time point. And taking the curve as the corresponding relation between the battery temperature and the battery temperature-related cooling time. Fig. 1B is a schematic diagram of a correspondence relationship between battery temperature and battery temperature-related cooling time in an embodiment of the invention.
When the battery temperature is determined, the battery temperature-related cooling time may be obtained according to the above-described curve representing the correspondence between the battery temperature and the battery temperature-related cooling time.
It will be appreciated that, the above takes the ambient temperature of 50 ℃ as the reference temperature, the correspondence between the battery temperature and the battery temperature-related cooling time obtained at this time is taken as the reference correspondence between the battery temperature and the battery temperature-related cooling time, and the cooling time is obtained by calibrating the ambient temperature-related ambient temperature influence coefficient with different ambient temperatures.
A22, an environmental temperature influence coefficient acquisition module, which is used for acquiring an environmental temperature influence coefficient related to the environmental temperature according to a preset corresponding relation between the environmental temperature and the environmental temperature influence coefficient;
in the embodiment of the invention, the environmental temperature influence coefficient may also be expressed as EnF.
A specific method for establishing a correspondence between an ambient temperature and an ambient temperature influence coefficient may, for example, include:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin at 45 ℃ again after the lowest temperature of the battery is higher than 62 ℃;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time from the beginning of cooling to the end of charging and pure cooling, and recording each temperature point and time in the process;
establishing a corresponding table of battery temperature and battery temperature associated cooling time when the ambient temperature is 45 ℃ according to the recorded temperature points and time;
then the correspondence table of the battery temperature and the battery temperature-associated cooling time may be, for example, when the ambient temperature is 45 ℃:
the above process is repeated, and only the temperature of the environmental chamber in the step of putting the vehicle again in the environmental chamber is changed, in the above example, to 45 c, and it is also necessary to change the temperature to 40 c, 35 c, and 30 c, respectively. Establishing a corresponding table of battery temperature and battery temperature associated cooling time under each environmental bin temperature;
taking the environmental chamber temperature of 50 ℃ as a reference, acquiring the environmental temperature influence coefficients when the environmental chamber temperature is 45 ℃, 40 ℃, 35 ℃ and 30 ℃ respectively, wherein the specific acquisition method comprises the following steps: for example, in the case where the ambient temperature is 45 ℃, the cooling time of the battery temperature at each point is compared with the cooling time of the same temperature when the ambient temperature is 50 ℃, and then the average of the ratio is calculated as the ambient temperature influence coefficient when the ambient temperature is 45 ℃.
Still taking the environment temperature of 45 ℃ as an example, the specific calculation method of the environment temperature influence coefficient at the moment is as follows:
ambient temperature 45 ℃ ambient temperature influence coefficient= ((T45-1)/(T50-1) + (T45-2)/(T50-2) + (T45-3)/(T50-3) + (T45-4)/(T50-4) + (T45-5)/(T50-5) + (T45-6)/(T50-6))/6
Establishing a coordinate axis, taking the environmental temperature influence coefficient of the environmental temperature (such as 45 ℃, 40 ℃, 35 ℃ and 30 ℃) corresponding to the environmental temperature as an abscissa and an ordinate respectively, taking the calculated data as points in the coordinate axis to be represented in the coordinate axis, and connecting all adjacent points by a linear interpolation method to obtain a corresponding curve of the environmental temperature and the environmental temperature influence coefficient. And taking the curve as the corresponding relation between the ambient temperature and the ambient temperature influence coefficient.
After the ambient temperature is determined, the battery temperature-related cooling time can be obtained according to the curve representing the corresponding relationship between the ambient temperature and the ambient temperature influence coefficient. Fig. 1C is a schematic diagram showing a correspondence relationship between an ambient temperature and an ambient temperature influence coefficient in an embodiment of the present invention.
A23, a pure cooling basic time calculation module, which is used for calculating the product of the battery temperature-related cooling time and the environmental temperature influence coefficient to be used as the pure cooling basic time;
that is, calculation: puT = RfT ×enf;
wherein, the liquid crystal display device comprises a liquid crystal display device,
PuT is the pure cool base time;
RfT is the battery temperature-dependent cooling time;
EnF is the environmental temperature influence coefficient;
in some embodiments of the present invention, the above pure cooling base time may be used as the power battery charging pure cooling remaining time, while in some other embodiments, the effect of the load level of the cooling device on the pure cooling remaining time may be further considered, as described in detail below.
The charger output power acquisition module 204 is configured to acquire charger output power;
a specific way to obtain the output power of the charger may be, for example:
the BMS judges that the current charging mode is AC charging, and the BMS detects the resistance value of a pull-down resistor of a charging gun head of an AC charging port to obtain the output power of the charger during AC charging, and the judging method is as follows:
the pull-down resistor is 1.5KΩ, the cable capacity of the charging gun is 10A, and the cable capacity of the charging gun is 2.2KW;
pull down resistor 680 Ω, charging gun cable capacity 16A, charging gun cable capacity 3.52KW;
pull down resistor 220 Ω, charging gun cable capacity 32A, charging gun cable capacity 7.04KW;
pull down resistor 100 Ω, charging gun cable capacity 63A, charging gun cable capacity 11KW;
the cable capacity of the charging gun is output power;
BMS judges that the current charging mode is direct current charging, and the output power is more than or equal to 20KW;
in the embodiment of the invention, the output power of the charger can also be expressed as ChrgP.
A load power consumption acquisition module 205, configured to acquire load power consumption;
in the embodiment of the present invention, the load consumption power may also be expressed as LoadP.
An air conditioner power acquisition module 206, configured to acquire air conditioner power;
in the embodiment of the invention, the air conditioning power may also be denoted as ACP.
An air conditioner cooling coefficient calculation module 207, configured to calculate an air conditioner cooling coefficient according to the output power, the load consumption power and the air conditioner power;
in the embodiment of the invention, the cooling coefficient of the air conditioner can be obtained by comparing the power of the air conditioner with the power which can be obtained by the air conditioner; the specific calculation mode is as follows:
ACF＝ACP/(ChrgP-LoadP)；
wherein, the liquid crystal display device comprises a liquid crystal display device,
ACF is the cooling coefficient of the air conditioner; and the ACF value range is ACF is more than or equal to 1, and if the ACF is less than 1, ACF=1 is taken;
ACP is the air conditioner power;
ChrgP is the charger output power;
LoadP is load power consumption
The power battery charging pure cooling remaining time calculation module 208 is configured to calculate a product of the pure cooling base time and an air conditioner cooling coefficient as the power battery charging pure cooling remaining time.
The specific calculation mode is as follows:
ChrgCoolT＝PuT*ACF
wherein, the liquid crystal display device comprises a liquid crystal display device,
the ChrgCoolT is the pure cooling residual time for charging the power battery;
PuT is the pure cool base time;
ACF is the air conditioner cooling coefficient.
According to the device disclosed by the embodiment of the invention, in the charging pure cooling process, the factors such as the battery temperature, the environment temperature and the like are fully considered, and the charging pure cooling residual time of the power battery can be accurately calculated.
Furthermore, the embodiment of the invention can also combine the influence of factors such as output power of a charger, load consumption power, air conditioner power and the like on battery cooling, and correct the result of calculating the pure cooling remaining time of the charging of the power battery, so that the calculation result is more in line with the actual situation.
The embodiment of the invention discloses a vehicle, which is any power battery charging pure cooling residual time calculating device.
The embodiment of the invention also discloses a computer readable storage medium storing a computer program, wherein the computer program enables a computer to execute any one of the power battery charging pure cooling remaining time calculation methods.
Those of ordinary skill in the art will appreciate that all or part of the steps of the various methods of the above embodiments may be implemented by a program that instructs associated hardware, the program may be stored in a computer readable storage medium including Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), programmable Read-Only Memory (Programmable Read-Only Memory, PROM), erasable programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), one-time programmable Read-Only Memory (OTPROM), electrically erasable programmable Read-Only Memory (EEPROM), compact disc Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM) or other optical disk Memory, magnetic disk Memory, tape Memory, or any other medium that can be used for carrying or storing data that is readable by a computer.
The above describes in detail a method and a device for calculating the pure cooling remaining time of charging a power battery, a vehicle and a storage medium, and specific examples are applied to illustrate the principle and implementation of the present invention, and the above description of the embodiment is only used to help understand the method and core idea of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (9)
1. A method for calculating the pure cooling remaining time of charging a power battery, comprising:
acquiring the temperature of a power battery;
acquiring an ambient temperature;
acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature;
taking the pure cooling basic time as the pure cooling residual time for charging the power battery;
the step of obtaining pure cooling basic time according to the temperature of the power battery and the ambient temperature comprises the following steps:
acquiring battery temperature-related cooling time corresponding to the battery temperature according to a preset corresponding relation between the battery temperature and the battery temperature-related cooling time;
acquiring an environmental temperature influence coefficient related to the environmental temperature according to a preset corresponding relation between the environmental temperature and the environmental temperature influence coefficient;
and calculating the product of the battery temperature-related cooling time and the environmental temperature influence coefficient as a pure cooling base time.
2. The power battery charging pure cooling remaining time calculation method according to claim 1, further comprising:
obtaining output power of a charger;
acquiring load consumption power;
acquiring the power of an air conditioner;
calculating an air conditioner cooling coefficient according to the output power, the load consumption power and the air conditioner power;
and calculating the product of the pure cooling basic time and the air conditioner cooling coefficient to be used as the pure cooling residual time for charging the power battery.
3. The power battery charging pure cooling remaining time calculation method according to claim 1, wherein:
the step of obtaining pure cooling basic time according to the temperature of the power battery and the ambient temperature comprises the following steps:
and obtaining the pure cooling basic time according to a pre-calibrated table look-up in the pure cooling basic time table related to the ambient temperature and the battery temperature.
4. The power battery charging pure cooling remaining time calculating method according to claim 3, wherein:
the method for establishing the pre-calibrated pure cooling basic schedule related to the ambient temperature and the battery temperature comprises the following steps:
placing the electric automobile in a high-temperature environment bin with a set temperature, and enabling the battery to rise to 45 ℃;
driving the vehicle under a vigorous working condition, raising the highest temperature of the battery to be higher than 65 ℃, and placing the vehicle in an environment bin with the set temperature again after the lowest temperature of the battery is higher than 62 ℃;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time of a battery from the beginning of cooling to the end of charging and pure cooling, and recording the temperature point and time of each battery in the process;
establishing a corresponding table of battery temperature and battery temperature associated cooling time at the set temperature according to the recorded battery temperature points and time;
changing the temperature of the environmental bin according to the environmental temperature value to be calibrated, and acquiring a corresponding table of the battery temperature and the battery temperature associated cooling time under the set environmental temperature again until acquiring all corresponding tables of the battery temperature and the battery temperature associated cooling time under the environmental temperature value to be calibrated;
and taking the acquired set of the corresponding tables of the battery temperature and the battery temperature associated cooling time under each environment temperature value needing calibration as the pre-calibrated pure cooling basic time table related to the environment temperature and the battery temperature.
5. The power battery charging pure cooling remaining time calculation method according to claim 1, wherein:
the method for establishing the corresponding relation between the preset battery temperature and the battery temperature-related cooling time comprises the following steps:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under a vigorous working condition, raising the highest temperature of the battery to be higher than 65 ℃, and after the lowest temperature of the battery is higher than 62 ℃, placing the vehicle into an environment bin with preset reference environment temperature again;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time of a battery from the beginning of cooling to the end of charging and pure cooling, and recording the temperature point and time of each battery in the process;
according to the recorded temperature points and time, a corresponding table of the battery temperature and the battery temperature related cooling time when the ambient temperature is the reference ambient temperature is established;
establishing a coordinate axis, taking the battery temperature and the cooling time in the corresponding table as an abscissa and an ordinate respectively, taking recorded data as points in the coordinate axis to be expressed in the coordinate axis, connecting all adjacent points through a linear interpolation method to obtain a corresponding curve of the battery temperature and a cooling time point, and taking the curve as a corresponding relation of the battery temperature and the battery temperature related cooling time.
6. The method for calculating the pure cooling remaining time for charging a power battery according to claim 5, wherein:
the method for establishing the corresponding relation between the preset ambient temperature and the ambient temperature influence coefficient comprises the following steps:
placing the electric automobile in a high-temperature environment bin, and enabling the battery to rise to 45 ℃;
driving the vehicle under the intense working condition, raising the highest temperature of the battery to be higher than 65 ℃, and after the lowest temperature of the battery is higher than 62 ℃, placing the vehicle into an environment bin for calibrating the environment temperature again;
inserting a vehicle into a direct current charging gun for charging and pure cooling, recording the temperature and time from the beginning of cooling to the end of charging and pure cooling, and recording each temperature point and time in the process;
establishing a corresponding table of battery temperature and battery temperature associated cooling time when the ambient temperature is the calibrated ambient temperature according to the recorded temperature points and time;
aiming at a corresponding table of battery temperature and battery temperature related cooling time when the environment temperature is the calibration environment temperature and a corresponding table of battery temperature and battery temperature related cooling time when the environment temperature is the reference environment temperature, taking the cooling time of each same battery temperature, obtaining an average value of a corresponding value in the calibration environment temperature table divided by a corresponding value in the reference environment temperature table, and taking the average value as an environment temperature coefficient at the calibration environment temperature;
acquiring an environmental temperature coefficient at the calibrated environmental temperature aiming at all the calibrated environmental temperatures;
establishing a coordinate axis, taking the environmental temperature influence coefficient corresponding to the calibrated environmental temperature and the environmental temperature as an abscissa and an ordinate respectively, taking the calculated data as points in the coordinate axis, connecting all adjacent points through a linear interpolation method, obtaining a corresponding curve of the environmental temperature and the environmental temperature influence coefficient, and taking the curve as a corresponding relation of the environmental temperature and the environmental temperature influence coefficient.
7. A power battery charging pure cooling remaining time calculation apparatus, comprising:
the power battery temperature acquisition module is used for acquiring the temperature of the power battery;
the environment temperature acquisition module is used for acquiring the environment temperature;
the pure cooling basic time acquisition module is used for acquiring pure cooling basic time according to the temperature of the power battery and the ambient temperature;
the charger output power acquisition module is used for acquiring the output power of the charger;
the load consumption power acquisition module is used for acquiring load consumption power;
the air conditioner power acquisition module is used for acquiring the air conditioner power;
the air conditioner cooling coefficient calculation module is used for calculating an air conditioner cooling coefficient according to the output power, the load consumption power and the air conditioner power;
the power battery charging pure cooling residual time calculation module is used for calculating the product of the pure cooling basic time and the air conditioner cooling coefficient as the power battery charging pure cooling residual time, wherein
The step of obtaining pure cooling basic time according to the temperature of the power battery and the ambient temperature comprises the following steps:
acquiring battery temperature-related cooling time corresponding to the battery temperature according to a preset corresponding relation between the battery temperature and the battery temperature-related cooling time;
acquiring an environmental temperature influence coefficient related to the environmental temperature according to a preset corresponding relation between the environmental temperature and the environmental temperature influence coefficient;
and calculating the product of the battery temperature-related cooling time and the environmental temperature influence coefficient as a pure cooling base time.
8. A vehicle comprising the power cell charge pure cooling remaining time calculating apparatus according to claim 7.
9. A computer-readable storage medium storing a computer program, wherein the computer program causes a computer to execute the power battery charging pure cooling remaining time calculation method according to any one of claims 1 to 6.
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| CN113779750B (en) * | 2021-07-22 | 2023-04-07 | 广东劲天科技有限公司 | Battery life prediction method and system based on charging state and charging pile |
| CN113836692B (en) * | 2021-08-20 | 2024-03-12 | 合众新能源汽车股份有限公司 | Estimation method and device for self-learning of slow charge remaining time of pure electric vehicle |
| CN114217233A (en) * | 2021-12-01 | 2022-03-22 | 广州小鹏汽车科技有限公司 | Vehicle residual charging time estimation method and device, vehicle and storage medium |
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