CN110931913B - Battery temperature control method, battery temperature control device, battery temperature control apparatus, and medium - Google Patents
Battery temperature control method, battery temperature control device, battery temperature control apparatus, and medium Download PDFInfo
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- CN110931913B CN110931913B CN201911128394.8A CN201911128394A CN110931913B CN 110931913 B CN110931913 B CN 110931913B CN 201911128394 A CN201911128394 A CN 201911128394A CN 110931913 B CN110931913 B CN 110931913B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6561—Gases
- H01M10/6563—Gases with forced flow, e.g. by blowers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a battery temperature control method, which is applied to a battery temperature control system and comprises the following steps: acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery; calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery; acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet; calculating a current enthalpy difference based on the first enthalpy and the second enthalpy; calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery; and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan. The method can acquire the air output quantity required by the fan in real time, and control the fan to remove the heat generated by the battery according to the air output quantity required by the fan, so that the temperature of the battery is in a stable controllable value in real time. In addition, a battery temperature control device, a battery temperature control apparatus, and a storage medium are also provided.
Description
Technical Field
The invention relates to the technical field of battery control, in particular to a method and a device for controlling battery temperature, battery temperature control equipment and a medium.
Background
The battery can store certain energy, and can temporarily solve the problem of electric energy demand. However, a certain amount of heat is generated in the charging and discharging processes of the battery, and when the generated heat is too large, the battery itself may be damaged to some extent, and even a high-temperature safety problem may be caused.
According to the traditional battery temperature control method, a temperature probe or other tools are used for measuring temperature change, and when the measured temperature is higher than a preset temperature, the temperature of the battery is over high, and then a controller starts a cooling device to cool the battery. However, this method cannot guarantee the battery temperature at a stable controllable value in real time.
Disclosure of Invention
In view of the above, it is necessary to provide a battery temperature control method, device, battery temperature control apparatus and medium capable of ensuring the battery temperature at a stable controllable value in real time.
A battery temperature control method is applied to a battery temperature control system, and comprises the following steps:
acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet;
calculating a current enthalpy difference based on the first enthalpy and the second enthalpy;
calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
In one embodiment, the battery temperature control system includes: a battery temperature sensor;
the temperature rise of obtaining the battery comprises the following steps:
and acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
In one embodiment, the battery temperature control system further comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; the first temperature sensor and the first humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air inlet, and the second temperature sensor and the second humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air outlet;
obtain the first enthalpy value of the air of air inlet department, obtain the second enthalpy value of the air of air outlet department, include:
acquiring a first temperature and a first humidity according to the first temperature sensor and the first humidity sensor;
calculating the first enthalpy from the first temperature and first humidity;
acquiring a second temperature and a second humidity according to the second temperature sensor and the second humidity sensor;
calculating the second enthalpy value based on the second temperature and the second humidity.
In one embodiment, the calculating the air output required by the fan according to the current enthalpy difference and the heat removal required by the fan includes:
and calculating the ratio of the heat removal amount required by the fan to the current enthalpy value, and taking the ratio as the air output amount required by the fan.
In one embodiment, the obtaining the specific heat capacity of the battery comprises:
acquiring the change relation between the specific heat capacity and the temperature of the battery;
acquiring the temperature of each moment, and determining the specific heat capacity corresponding to each moment according to the temperature of each moment;
the method for calculating the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery comprises the following steps:
and calculating according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery.
In one embodiment, the controlling the fan to remove the heat generated by the battery according to the air output required by the fan includes:
acquiring the maximum output air volume of a fan;
determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity;
determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is more than or equal to the minimum number of fans;
determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans;
determining the control voltage of the fan according to the target wind speed;
and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
A battery temperature control apparatus, the apparatus comprising:
the first acquisition module is used for acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
the first calculation module is used for calculating the generated heat of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
the second acquisition module is used for acquiring a first enthalpy value of the air at the air inlet and acquiring a second enthalpy value of the air at the air outlet;
the second calculation module is used for calculating the current enthalpy difference according to the first enthalpy value and the second enthalpy value;
the third calculation module is used for calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, and the heat removal quantity value required by the fan is the same as the heat generation quantity value of the battery;
and the control module is used for controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
In one embodiment, the battery temperature control apparatus includes: a battery temperature sensor;
the first acquisition module is also used for acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet;
calculating a current enthalpy difference based on the first enthalpy and the second enthalpy;
calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
A battery temperature control apparatus comprising a memory and a processor, the memory storing a computer program that, when executed by the processor, causes the processor to perform the steps of:
acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet;
calculating a current enthalpy difference based on the first enthalpy and the second enthalpy;
calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
The embodiment of the invention has the following beneficial effects:
the invention provides a battery temperature control method, a battery temperature control device and a medium. The method comprises the steps of firstly obtaining the specific heat capacity, the mass and the temperature rise of a battery, calculating to obtain the heat generation quantity of the battery, then obtaining the air output quantity required by a fan through the obtained heat generation quantity of the battery, and finally controlling the fan to remove the heat generation quantity of the battery according to the air output quantity required by the fan. The invention can obtain the air output quantity required by the fan in real time, control the fan to remove the heat generated by the battery according to the air output quantity required by the fan, and ensure that all the heat generated by the battery is accurately removed, thereby realizing the control of the temperature of the battery to be in a stable controllable value in real time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Wherein:
FIG. 1 is a schematic diagram illustrating a flow chart of a method for controlling a battery temperature according to an embodiment;
FIG. 2 is a schematic diagram of a flow chart of a method for controlling battery temperature according to another embodiment;
FIG. 3 is a schematic diagram of a flow chart of a method for controlling battery temperature according to another embodiment;
FIG. 4 is a schematic diagram illustrating a flow chart of a method for controlling a battery temperature according to another embodiment;
FIG. 5 is a schematic structural diagram of a battery temperature control apparatus according to an embodiment;
fig. 6 is a block diagram showing the structure of a battery temperature control device in one embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In one embodiment, as shown in fig. 1, a battery temperature control method is provided, which is applied to a battery temperature control system, and specifically includes the following steps:
and 102, acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery.
Wherein, the specific heat capacity refers to the ratio of the amount of heat absorbed to the product of the mass of the substance and the elevated temperature at elevated temperatures, in units of joules per kilogram Kelvin [ J/(kg. K) ] or joules per kilogram per degree Celsius [ J/(kg. C) ]. The amount of temperature increase of the battery refers to an amount of temperature increase of the battery per unit time. For convenience of measurement, the temperature unit can be given in degrees centigrade and the corresponding specific heat capacity unit can be given in joules per kilogram per degree centigrade. The unit time is a preset value, which may be 20s, for example. The battery may be a high nickel battery, but may be other batteries.
And 104, calculating to obtain the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery.
The battery heat generation amount is the amount of heat generated by the battery per unit time. The battery generated heat is the heat that needs to be completely removed to ensure that the battery temperature is controlled. The battery heat generation amount can be obtained through the specific heat capacity of the battery, the quality of the battery and the temperature rise amount of the battery, and the specific heat capacity of the battery, the quality of the battery and the temperature rise amount of the battery satisfy the formula: q is Cm Δ T, where Q represents the amount of heat generated by the battery, C represents the specific heat capacity of the battery, m represents the mass of the battery, and Δ T represents the amount of temperature rise of the battery.
And 106, acquiring a first enthalpy value of the air at the air inlet and acquiring a second enthalpy value of the air at the air outlet.
The enthalpy value of the air refers to the total heat contained in the air, and comprises the sum of the enthalpy of one kilogram of dry air and the enthalpy of the water vapor corresponding to the enthalpy of the one kilogram of dry air (contained in 1Kg of dry air). The first enthalpy of the air is the enthalpy of the air at the air inlet and is the enthalpy before the air takes away the heat generated by the battery. The second enthalpy value of the air refers to the enthalpy value of the air at the air outlet, the enthalpy value is the enthalpy value of the air after the air carries away the heat generated by the battery, and the second enthalpy value is larger than the first enthalpy value.
And 108, calculating the current enthalpy difference according to the first enthalpy and the second enthalpy.
The current enthalpy difference represents the change of the enthalpy value before and after the air generates heat in the transport battery, and the change is obtained by subtracting the first enthalpy value from the second enthalpy value.
And 110, calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery.
The heat removal amount required by the fan is the amount of heat which needs to be removed by the fan in unit time, and in order to control the temperature of the battery, the amount of heat removed by the fan in unit time is the same as the amount of heat generated by the battery in the same unit time, so that the heat generated by the battery is taken away by the air generated by the fan. The air output required by the fan refers to the air output required by the fan in unit time.
And step 112, controlling a fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
When the fan discharges air according to the air quantity required by the fan, all the heat generated by the batteries is taken away by the air generated by the fan.
According to the battery temperature control method, the heat generation quantity of the battery is obtained through calculation by obtaining the specific heat capacity, the mass and the temperature rise quantity of the battery, the air output quantity required by the fan is obtained through the obtained heat generation quantity of the battery, and finally the fan is controlled to remove the heat generation quantity of the battery according to the air output quantity required by the fan. The invention can obtain the air output quantity required by the fan in real time, control the fan to remove the heat generated by the battery according to the air output quantity required by the fan, and ensure that all the heat generated by the battery is accurately removed, thereby realizing the control of the temperature of the battery to be in a stable controllable value in real time.
In one embodiment, as shown in fig. 2, the obtaining the specific heat capacity of the battery includes:
in step 202, the change relation between the specific heat capacity and the temperature of the battery is obtained.
The change relationship of the specific heat capacity of the battery and the temperature reflects the change of the specific heat capacity of the battery along with the temperature. The relationship between the specific heat capacity and the temperature of the battery may be a linear function, for example, C ═ KT + C0Wherein C represents the specific heat capacity of the battery and T represents the temperature of the battery.
And 204, acquiring the temperature at each moment, and determining the specific heat capacity corresponding to each moment according to the temperature at each moment.
When a certain change relation exists between the temperature and the specific heat capacity, the specific heat capacity at the corresponding moment can be obtained by obtaining the temperatures at different moments. For example, when the specific heat capacity and temperature of the battery satisfy a linear function relationship: 1.074[ J/(kg. DEG C) ], when C is 1.242-0.0056T and T is equal to 30 ℃.
The method for calculating the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery comprises the following steps:
and step 206, calculating to obtain the heat generation quantity of the battery according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise quantity of the battery.
For example, when the specific heat capacity and temperature of the battery satisfy a linear function relationship: C-KT + C0And in time, the specific heat capacity C of the battery, the mass m of the battery and the temperature rise quantity Delta T of the battery satisfy the formula:
where T1 is the initial temperature at which the temperature of the battery is not raised, and Δ T is the amount of temperature rise of the battery.
According to the battery temperature control method, the battery heat generation quantity is calculated by obtaining the mass of the battery, the temperature rise quantity of the battery and the specific heat capacities of the batteries at different temperatures, the situation that the specific heat capacities of the batteries are different at different temperatures is considered, and the battery heat generation quantity can be calculated more accurately.
In one embodiment, the battery temperature control system includes: a battery temperature sensor; the temperature rise of obtaining the battery comprises the following steps: and acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
The battery temperature sensor is arranged on the surface of the battery and used for measuring the initial temperature of the battery before the unit time and the temperature of the battery after the unit time, so that the temperature rise of the battery is calculated according to the initial temperature of the battery and the temperature of the battery after the unit time.
According to the battery temperature control method, the battery temperature sensor is used for measuring the initial temperature of the battery before unit time and the temperature of the battery after unit time, so that the temperature rise of the battery is obtained, and the accurate measurement of the temperature rise of the battery can be realized.
In one embodiment, the battery temperature control system further comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; first temperature sensor with first humidity transducer is used for gathering the temperature and the humidity of the air of air inlet department respectively, second temperature sensor and second humidity transducer are used for gathering the temperature and the humidity of the air of air outlet department respectively.
As shown in fig. 3, the step 106 of obtaining a first enthalpy of the air at the air inlet and obtaining a second enthalpy of the air at the air outlet includes:
Wherein, first temperature sensor and first humidity transducer all install in fan air intake department. The first temperature is the temperature of the air at the air inlet of the fan and is obtained through the first temperature sensor. The first humidity refers to the humidity of the air at the air inlet of the fan and is obtained through the first humidity sensor.
The first enthalpy value can be obtained by calculating a first temperature and a first humidity, and the first enthalpy value, the first temperature and the first humidity satisfy the following formula: i is 1.01t + (2500+1.84t) d, wherein the enthalpy value can be substituted for i, the first temperature can be substituted for t, the first humidity can be substituted for d, 1.01 represents the average constant pressure specific heat of dry air, 1.84 represents the average constant pressure specific heat of water vapor, and 2500 represents the latent heat of vaporization of water at 0 ℃.
Wherein, the second temperature sensor and the second humidity sensor are arranged at the air outlet of the fan. The second temperature is the temperature of the air at the air outlet of the fan and is obtained through a second temperature sensor. The first humidity is the humidity of the air at the air outlet of the fan and is obtained by the second humidity sensor.
The second enthalpy value can be obtained by calculating a second temperature and a second humidity, and the second enthalpy value, the second temperature and the second humidity also satisfy the following formula: i is 1.01t + (2500+1.84t) d.
According to the battery temperature control method, the first temperature and the first humidity are obtained through the first temperature sensor and the first humidity sensor, and the first enthalpy value is obtained through calculation according to the first temperature and the first humidity. And acquiring a second temperature and a second humidity through a second temperature sensor and a second humidity sensor, and calculating according to the second temperature and the second humidity to obtain a second enthalpy value. According to the method, the first enthalpy value and the second enthalpy value can be accurately obtained through the first temperature sensor, the first humidity sensor, the second temperature sensor and the second humidity sensor, so that the change of the enthalpy values of the air at the air inlet of the fan and the air outlet of the fan can be accurately reflected.
In one embodiment, the step 110 of calculating the required air volume of the fan according to the current enthalpy difference and the required heat removal amount of the fan, wherein the required heat removal amount of the fan is the same as the heat generation amount of the battery comprises: and calculating the ratio of the heat removal amount required by the fan to the current enthalpy value, and taking the ratio as the air output amount required by the fan.
The air output required by the fan can be obtained by calculating the heat removal amount required by the fan and the current enthalpy difference, and the formula is satisfied between the air output required by the fan and the heat removal amount required by the fan and the current enthalpy difference: f is Q/. DELTA.H, where F represents the required air output of the fan, Q represents the required heat removal capacity of the fan, and Δ H represents the current enthalpy difference.
According to the battery temperature control method, the air output quantity required by the fan is calculated through the acquired heat removal quantity required by the fan and the current enthalpy difference, so that when the fan outputs air according to the air output quantity required by the fan, all battery heat generation quantity is taken away by air generated by the fan, and the control of the battery temperature is realized.
In one embodiment, as shown in fig. 4, the step 112 of controlling the fan to remove the heat generated by the battery according to the air output required by the fan includes:
The maximum output air volume refers to the maximum air volume which can be output by a single fan in unit time.
And step 404, determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity.
The battery temperature control system comprises a plurality of fans, and a plurality of same fans are required to be started at the same time in order to meet the requirement that the fans output air with the air output required by the fans. The minimum number of fans is the minimum number of fans which can meet the requirement that the fans output air according to the air output quantity required by the fans. When the fans with the least number of fans all output air with the maximum output air quantity, the total air quantity is equal to or slightly larger than the air quantity required by the fans.
And 406, determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is greater than or equal to the minimum number of fans.
The number of operating fans refers to the number of fans actually started in the process of controlling the temperature of the battery. In order to ensure that the total air output by the fans can meet the requirement of the air output required by the fans, and simultaneously, in order to ensure that each fan can output air with normal air output rather than always output air with maximum air output, the number of operating fans can be determined as follows: the number of operating fans is equal to the minimum number of fans +2, and of course, other determination methods may be selected for the number of operating fans, but it is required to ensure that the number of operating fans is greater than or equal to the minimum number of fans.
And step 408, determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans.
The target wind speed refers to the wind speed that each fan needs to achieve in order to meet the air output required by the fan.
And step 410, determining the control voltage of the fan according to the target wind speed.
The target wind speed is controlled by the control voltage, and the control voltage and the target wind speed meet the formula: v is KU, where V denotes a target wind speed, U denotes a control voltage, and K is a constant, and is determined by the fan model.
And step 412, controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
When the fan is blowing out at the target wind speed, all the heat generated by the battery is taken away by the air generated by the fan.
According to the battery temperature control method, the maximum output air volume of one fan is obtained; determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity; determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is more than or equal to the minimum number of fans; determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans; determining the control voltage of the fan according to the target wind speed; and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery. The method can specifically convert the control of the fan to the control of the number of the operating fans and the control voltage of the fan according to the air output quantity required by the fan, thereby realizing more specific and accurate control of the air output quantity required by the fan.
In one embodiment, as shown in fig. 5, there is provided a battery temperature control apparatus including:
the first obtaining module 502 is configured to obtain a specific heat capacity of the battery, obtain a mass of the battery, and obtain a temperature rise of the battery.
The first calculating module 504 is configured to calculate a battery heat generation amount according to the specific heat capacity of the battery, the mass of the battery, and the temperature rise amount of the battery.
The second obtaining module 506 is configured to obtain a first enthalpy value of the air at the air inlet and obtain a second enthalpy value of the air at the air outlet.
A second calculating module 508, configured to calculate a current enthalpy difference according to the first enthalpy value and the second enthalpy value.
And a third calculating module 510, configured to calculate an air output required by the fan according to the current enthalpy difference and a heat removal amount required by the fan, where a heat removal amount required by the fan is the same as a heat generation amount of the battery.
And the control module 512 is used for controlling the fan to remove the heat generated by the battery according to the air outlet amount required by the fan.
According to the battery temperature control device, the heat generation quantity of the battery is obtained through calculation by obtaining the specific heat capacity, the mass and the temperature rise quantity of the battery, the air output quantity required by the fan is obtained through the obtained heat generation quantity of the battery, and finally the fan is controlled to remove the heat generation quantity of the battery according to the air output quantity required by the fan. The invention can obtain the air output quantity required by the fan in real time, control the fan to remove the heat generated by the battery according to the air output quantity required by the fan, and ensure that all the heat generated by the battery is accurately removed, thereby realizing the control of the temperature of the battery to be in a stable controllable value in real time.
In one embodiment, the apparatus includes a battery temperature sensor; the first obtaining module 502 is further configured to obtain the temperature rise of the battery in unit time through the battery temperature sensor.
In one embodiment, the apparatus comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; the first temperature sensor and the first humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air inlet, and the second temperature sensor and the second humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air outlet; the second obtaining module 506 is further configured to obtain a first temperature and a first humidity according to the first temperature sensor and the first humidity sensor; calculating the first enthalpy from the first temperature and first humidity; acquiring a second temperature and a second humidity according to the second temperature sensor and the second humidity sensor; calculating the second enthalpy value based on the second temperature and the second humidity.
In one embodiment, the third calculation module 510 is further configured to calculate a ratio between the required heat removal amount of the fan and the current enthalpy, and use the ratio as the required air output amount of the fan.
In one embodiment, the first obtaining module 502 is further configured to obtain a variation relationship between a specific heat capacity and a temperature of the battery; acquiring the temperature of each moment, and determining the specific heat capacity corresponding to each moment according to the temperature of each moment; the method for calculating the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery comprises the following steps: and calculating according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery.
In one embodiment, the control module 512 is further configured to obtain a maximum output air volume of one fan; determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity; determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is more than or equal to the minimum number of fans;
determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans; determining the control voltage of the fan according to the target wind speed; and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
Fig. 6 is a diagram showing an internal structure of a battery temperature control apparatus in one embodiment. As shown in fig. 6, the battery temperature control apparatus includes a processor, a memory, and a network interface connected through a system bus. Wherein the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the battery temperature control apparatus stores an operating system and may further store a computer program that, when executed by the processor, causes the processor to implement the battery temperature control method. The internal memory may also have stored therein a computer program that, when executed by the processor, causes the processor to perform a battery temperature control method. It will be understood by those skilled in the art that the structure shown in fig. 6 is a block diagram of only a portion of the structure associated with the present application and does not constitute a limitation on the battery temperature control device to which the present application is applied, and a particular battery temperature control device may include more or less components than shown in the drawings, or combine certain components, or have a different arrangement of components.
A battery temperature control apparatus for use in a battery temperature control system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet;
calculating a current enthalpy difference based on the first enthalpy and the second enthalpy;
calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
In one embodiment, the battery temperature control system includes: a battery temperature sensor;
the temperature rise of obtaining the battery comprises the following steps:
and acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
In one embodiment, the battery temperature control system further comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; the first temperature sensor and the first humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air inlet, and the second temperature sensor and the second humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air outlet;
obtain the first enthalpy value of the air of air inlet department, obtain the second enthalpy value of the air of air outlet department, include:
acquiring a first temperature and a first humidity according to the first temperature sensor and the first humidity sensor;
calculating the first enthalpy from the first temperature and first humidity;
acquiring a second temperature and a second humidity according to the second temperature sensor and the second humidity sensor;
calculating the second enthalpy value based on the second temperature and the second humidity.
In one embodiment, the calculating the air volume required by the fan according to the current enthalpy difference and the heat removal required by the fan comprises:
and calculating the ratio of the heat removal amount required by the fan to the current enthalpy value, and taking the ratio as the air output amount required by the fan.
In one embodiment, the obtaining the specific heat capacity of the battery comprises:
acquiring the change relation between the specific heat capacity and the temperature of the battery;
acquiring the temperature of each moment, and determining the specific heat capacity corresponding to each moment according to the temperature of each moment;
the method for calculating the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery comprises the following steps:
and calculating according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery.
In one embodiment, the controlling the fan to remove the heat generated by the battery according to the air output required by the fan includes:
acquiring the maximum output air volume of a fan;
determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity;
determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is more than or equal to the minimum number of fans;
determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans;
determining the control voltage of the fan according to the target wind speed;
and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
A computer-readable storage medium for use in a battery temperature control system, the computer-readable storage medium storing a computer program, the computer program when executed by a processor implementing the steps of:
acquiring the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first enthalpy value of air at an air inlet and a second enthalpy value of air at an air outlet;
calculating a current enthalpy difference based on the first enthalpy and the second enthalpy;
calculating the air output quantity required by the fan according to the current enthalpy difference and the heat removal quantity required by the fan, wherein the heat removal quantity required by the fan is the same as the heat generation quantity of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
In one embodiment, the battery temperature control system includes: a battery temperature sensor;
the temperature rise of obtaining the battery comprises the following steps:
and acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
In one embodiment, the battery temperature control system further comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; the first temperature sensor and the first humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air inlet, and the second temperature sensor and the second humidity sensor are respectively used for acquiring the temperature and the humidity of the air at the air outlet;
obtain the first enthalpy value of the air of air inlet department, obtain the second enthalpy value of the air of air outlet department, include:
acquiring a first temperature and a first humidity according to the first temperature sensor and the first humidity sensor;
calculating the first enthalpy from the first temperature and first humidity;
acquiring a second temperature and a second humidity according to the second temperature sensor and the second humidity sensor;
calculating the second enthalpy value based on the second temperature and the second humidity.
In one embodiment, the calculating the air volume required by the fan according to the current enthalpy difference and the heat removal required by the fan comprises:
and calculating the ratio of the heat removal amount required by the fan to the current enthalpy value, and taking the ratio as the air output amount required by the fan.
In one embodiment, the obtaining the specific heat capacity of the battery comprises:
acquiring the change relation between the specific heat capacity and the temperature of the battery;
acquiring the temperature of each moment, and determining the specific heat capacity corresponding to each moment according to the temperature of each moment;
the method for calculating the heat generation quantity of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise quantity of the battery comprises the following steps:
and calculating according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery.
In one embodiment, the controlling the fan to remove the heat generated by the battery according to the air output required by the fan includes:
acquiring the maximum output air volume of a fan;
determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity;
determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is more than or equal to the minimum number of fans;
determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans;
determining the control voltage of the fan according to the target wind speed;
and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
It should be noted that the battery temperature control method, the battery temperature control apparatus, the battery temperature control device and the computer readable storage medium are included in a general inventive concept, and the contents of the battery temperature control method, the battery temperature control apparatus, the battery temperature control device and the computer readable storage medium in the embodiments are mutually applicable.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a non-volatile computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A battery temperature control method is applied to a battery temperature control system, and is characterized in that the battery temperature control system comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; the first temperature sensor and the first humidity sensor are respectively used for collecting the temperature and the humidity of the air at the air inlet, the second temperature sensor and the second humidity sensor are respectively used for collecting the temperature and the humidity of the air at the air outlet, and the method comprises the following steps:
acquiring a linear function relationship between the specific heat capacity and the temperature of the battery, acquiring the temperature at each moment, and determining the specific heat capacity corresponding to each moment according to the temperature at each moment and the linear function relationship;
acquiring the quality of the battery and the temperature rise of the battery;
calculating according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery;
acquiring a first temperature t according to the first temperature sensor and the first humidity sensor1And a first wet d1According to i ═ 1.01t1+(2500+1.84t1)d1Calculating a first enthalpy i of air at the air inlet1；
Acquiring a second temperature t according to the second temperature sensor and the second humidity sensor2And a second wet d2According to i ═ 1.01t2+(2500+1.84t2)d2Calculating a second enthalpy i of air at the air inlet2；
According to the first enthalpy value i1Calculating a current enthalpy difference from the second enthalpy value;
calculating the ratio of the heat removal amount required by the fan to the current enthalpy value, and taking the ratio as the air output amount required by the fan, wherein the heat removal amount required by the fan is the same as the heat generation amount of the battery;
and controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
2. The method of claim 1, wherein the battery temperature control system comprises: a battery temperature sensor;
the temperature rise of obtaining the battery comprises the following steps:
and acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
3. The method according to claim 1, wherein calculating the amount of heat generated by the battery from the specific heat capacity of the battery, the mass of the battery, and the amount of temperature rise of the battery comprises:
and calculating according to the corresponding specific heat capacity at each moment, the mass of the battery and the temperature rise of the battery to obtain the heat generation quantity of the battery.
4. The method of claim 1, wherein controlling a fan to remove the amount of heat generated by the battery based on the amount of air output required by the fan comprises:
acquiring the maximum output air volume of a fan;
determining the minimum number of fans according to the air output quantity required by the fans and the maximum output air quantity;
determining the number of operating fans according to the minimum number of fans, wherein the number of operating fans is greater than or equal to the minimum number of fans;
determining the target wind speed of each fan according to the number of the operating fans and the required wind output of the fans;
determining the control voltage of the fan according to the target wind speed;
and controlling the wind speed of each fan according to the control voltage so as to remove the heat generated by the battery.
5. A battery temperature control device is applied to a battery temperature control system, and is characterized in that the battery temperature control system comprises: a first temperature sensor, a first humidity sensor, a second temperature sensor and a second humidity sensor; first temperature sensor with first humidity transducer is used for gathering the temperature and the humidity of the air of air inlet department respectively, second temperature sensor and second humidity transducer are used for gathering the temperature and the humidity of the air of air outlet department respectively, the device includes:
the first acquisition module is used for acquiring a linear function relationship between the specific heat capacity and the temperature of the battery, acquiring the temperature at each moment, determining the specific heat capacity corresponding to each moment according to the temperature at each moment and the linear function relationship, acquiring the quality of the battery and acquiring the temperature rise of the battery;
the first calculation module is used for calculating the generated heat of the battery according to the specific heat capacity of the battery, the mass of the battery and the temperature rise of the battery;
a second obtaining module, configured to obtain a first temperature t1 and a first humidity d1 according to the first temperature sensor and the first humidity sensor, and calculate a first enthalpy value i1 of air at the air inlet according to i 1.01t1+ (2500+1.84t1) d 1;
acquiring a second temperature t2 and a second humidity d2 according to the second temperature sensor and the second humidity sensor, and calculating a second enthalpy value i2 of air at the air inlet according to i-1.01 t2+ (2500+1.84t2) d 2;
a second calculation module for calculating the first enthalpy value i1And the second enthalpy value i2Calculating the current enthalpy difference;
the third calculation module is used for calculating the ratio between the heat removal amount required by the fan and the current enthalpy value, the ratio is used as the air output amount required by the fan, and the heat removal amount required by the fan is the same as the heat generation amount of the battery;
and the control module is used for controlling the fan to remove the heat generated by the battery according to the air outlet quantity required by the fan.
6. The battery temperature control apparatus according to claim 5, characterized in that: the battery temperature control apparatus includes: a first temperature sensor;
the first acquisition module is also used for acquiring the temperature rise of the battery in unit time through the battery temperature sensor.
7. A computer-readable storage medium, storing a computer program which, when executed by a processor, causes the processor to carry out the steps of the method according to any one of claims 1 to 4.
8. A battery temperature control apparatus comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, causes the processor to perform the steps of the method of any one of claims 1 to 4.
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| CN107579308B (en) * | 2017-08-31 | 2019-08-27 | 江苏大学 | A kind of batteries of electric automobile packet heat management and temperature equalization control method |
| CN108987847B (en) * | 2018-07-17 | 2020-12-08 | 任才银 | Cooling control method for new energy automobile power battery |
| CN109713382B (en) * | 2018-12-11 | 2021-06-04 | 威马汽车科技集团有限公司 | Electric automobile battery panel cooling system and control method |
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| CN104776944A (en) * | 2015-04-16 | 2015-07-15 | 广东美的制冷设备有限公司 | Air conditioner heat exchange amount detection method and device |
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