Air cooling control method and system of power battery, medium and electric vehicle

Abstract

The invention discloses an air cooling control method and system for a power battery, a medium and an electric vehicle. The method comprises the steps that the actual battery temperature of the power battery is monitored in real time; according to the actual battery temperature and the target battery temperature, determining a rotating speed regulation factor of an air blower for cooling the power battery and an aperture regulation factor of a jet hole for introducing air into the power battery for cooling from a comprehensive control model; wherein the comprehensive control model is fitted with control logic among the battery temperature, the rotating speed regulation factor and the aperture regulation factor; and controlling the output power of the air blower based on the rotating speed regulation factor, and controlling the aperture size of the jet hole based on the aperture regulation factor so as to comprehensively cool the power battery.

Description

Technical Field

[0001] The present application relates to the field of battery control technology, and in particular to an air cooling control method, system, medium and electric vehicle for a power battery. Background Art

[0002] At present, electric vehicles generally rely on power batteries to provide endurance. When electric vehicles operate under complex and changeable conditions such as high speed, low speed, acceleration, and deceleration, the power battery will discharge and generate heat, causing the temperature to rise, which will directly affect many characteristic parameters of the battery, such as internal resistance, voltage, SOC, available capacity, charge and discharge efficiency, and battery life. Therefore, battery cooling has become an important part of battery system development.

[0003] The existing electric vehicle battery pack mainly adopts air cooling, which mainly uses external air as the heat exchange medium. The external air is cooled by passive or active means before entering the battery system for heat exchange. This method has limited effect on battery cooling and cannot effectively improve the cooling efficiency of the battery. Summary of the invention

[0004] In order to solve or partially solve the technical problem that the cooling efficiency of the battery cannot be effectively improved, the present invention provides an air cooling control method, system, medium and electric vehicle for a power battery. By combining the actual battery temperature of the power battery and the comprehensive control model, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet hole for cooling the power battery by letting air into the power battery are fitted, and the power battery is comprehensively cooled, thereby quickly cooling the power battery, which can meet the requirements of harsh and changeable thermal environments, realize multi-condition efficient cooling of the power battery, and improve the thermal safety and service life of the battery.

[0005] In order to solve the above technical problems, the first aspect of the present invention discloses a method for controlling air cooling of a power battery, the method comprising:

[0006] Real-time monitoring of the actual battery temperature of the power battery;

[0007] According to the actual battery temperature and the target battery temperature, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by introducing air are determined from a comprehensive control model; wherein the comprehensive control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor;

[0008] The output power of the blower is controlled based on the speed adjustment factor, and the aperture size of the jet hole is controlled based on the aperture adjustment factor, so as to comprehensively cool the power battery.

[0009] Optionally, the comprehensive control model is: K1·K2=T / T0; wherein K1 is the speed adjustment factor, K2 is the aperture adjustment factor, T is the battery target temperature, and T0 is the battery actual temperature.

[0010] Optionally, controlling the output power of the blower based on the speed adjustment factor specifically includes:

[0011] According to the speed adjustment factor and the power control model: Control the output power of the blower; wherein N is the output power of the blower, Q is the actual air volume of the blower, P is the back pressure of the blower; η is the efficiency of the blower, The actual air volume of the blower is obtained; wherein K1 is the speed adjustment factor, n is the actual speed of the blower, n0 is the target speed of the blower, and Q0 is the target air volume of the blower.

[0012] Optionally, controlling the aperture size of the jet hole based on the aperture adjustment factor specifically includes:

[0013] Combining the pore size adjustment factor and the pore size adjustment model Control the aperture size of the jet hole; wherein D is the aperture of the jet hole, Nu is the Nusselt number, K is the thermal conductivity of the fluid, h is the convection heat transfer coefficient, and K2 is the aperture adjustment factor.

[0014] Optionally, after real-time monitoring of the actual battery temperature of the power battery, the method further includes:

[0015] Determining a temperature control calibration value according to the actual battery temperature;

[0016] The temperature regulating component is controlled to reduce the temperature of the air entering the power battery according to the temperature control calibration value.

[0017] Optionally, a jet hole is installed above the battery cell of the power battery, and the jet hole impacts the air in the air duct to the battery cell to cool the battery cell;

[0018] The temperature adjustment component is connected to the air inlet of the air duct to cool the air;

[0019] The blower is connected to the power battery and is used to control the air flow rate in the power battery.

[0020] Optionally, a plurality of rotating blades are installed in the jet hole, and the rotating blades are controlled by a control motor to move so as to change the aperture of the jet hole.

[0021] A second aspect of the present invention discloses an air cooling control system for a power battery, comprising:

[0022] Monitoring module, used to monitor the actual battery temperature of the power battery in real time;

[0023] a determination module, configured to determine, from a comprehensive control model, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by introducing air according to the actual battery temperature and the target battery temperature; wherein the comprehensive control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor;

[0024] The regulating module is used to control the output power of the blower based on the speed regulating factor, and to control the aperture size of the jet hole based on the aperture regulating factor, so as to comprehensively cool the power battery.

[0025] According to a third aspect of the present invention, a computer-readable storage medium is disclosed, on which a computer program is stored, and when the program is executed by a processor, the steps of the above method are implemented.

[0026] In a fourth aspect of the present invention, an electric vehicle is disclosed, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0027] Through one or more technical solutions of the present invention, the present invention has the following beneficial effects or advantages:

[0028] The present invention provides an air cooling control method, system, medium and electric vehicle for a power battery. By combining the actual battery temperature of the power battery and a comprehensive control model, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by letting air in are fitted, and the power battery is cooled comprehensively, thereby quickly cooling the power battery, meeting the requirements of harsh and changeable thermal environments, realizing multi-operating-condition efficient cooling of the power battery, and improving the thermal safety and service life of the battery.

[0029] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0031] Figure 1 A schematic diagram of related structures in an air cooling control system according to an embodiment of the present invention is shown;

[0032] Figure 2 A flow chart showing a method for controlling air cooling of a power battery according to an embodiment of the present invention is shown;

[0033] Figure 3 A schematic diagram of the structure of a jet hole according to an embodiment of the present invention is shown;

[0034] Figure 4 A module diagram of an air cooling control system according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0036] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0037] In a first aspect, an embodiment of the present invention provides an air cooling control method for a power battery, which is applied in an air cooling control system.

[0038] In order to further understand the implementation scheme of the present invention, the relevant structure of the power battery in this embodiment is first introduced below.

[0039] See also Figure 1 , is a schematic diagram of the relevant structure in the air cooling control system of the present invention.

[0040] The air cooling control system includes: an air intake assembly (not shown in the figure), a temperature control assembly 101, a power battery 102, a plurality of jet holes 103, a blower 104 and an exhaust assembly (not shown in the figure).

[0041] The air intake assembly is connected to the power battery 102 via an air duct.

[0042] The temperature adjustment component is connected to the air duct and is used to cool the air entering the power battery 102 .

[0043] A jet hole 103 is installed above the cell of the power battery 102, and the jet hole 103 impacts the air in the air duct to the cell to cool the cell. Further, the temperature adjustment component first cools the air in the air duct, and the aperture size of the jet hole 103 is adjustable, and the air in the air duct is impacted to the cell to cool the cell. The aperture of the jet hole 103 is positively correlated with the cooling effect, and the larger the aperture, the better the cooling effect.

[0044] The blower 104 is connected between the power battery 102 and the exhaust assembly, and is used to control the air flow rate in the power battery 102. The higher the speed of the blower 104, the greater the air flow rate in the power battery 102, and the better the cooling effect.

[0045] A temperature sensor is disposed inside the power battery 102 to measure the actual battery temperature of the power battery 102 .

[0046] The working principle of the air cooling control system is: the temperature sensor inside the power battery 102 measures the actual temperature of the battery, and transmits the temperature signal to the temperature control component 101 to adjust the temperature of the incoming air; on the other hand, the temperature signal is used to comprehensively adjust the power (or speed) of the blower 104 and the aperture of the jet hole 103. Specifically, the power of the blower 104 is adjusted based on the temperature signal, thereby adjusting the air volume, and the aperture of the jet hole 103 is adjusted based on the temperature signal.

[0047] In order to further illustrate and explain the present invention, the following Figure 2 As shown, the air cooling control method of the power battery in the embodiment of the present invention includes the following steps:

[0048] S201, monitoring the actual battery temperature of the power battery in real time.

[0049] The actual battery temperature of the power battery is measured by a temperature sensor. Specifically, the actual temperature of some or all of the cells of the power battery is measured, and then the average temperature is calculated as the actual battery temperature of the power battery. Of course, the actual temperature of a cell of the power battery can also be randomly measured as the actual battery temperature of the power battery.

[0050] After real-time monitoring of the actual battery temperature of the power battery, the temperature signal is transmitted to the temperature control component 101 to adjust the temperature of the incoming air. Specifically, the temperature control calibration value is determined according to the actual battery temperature. Specifically, the battery temperature and the temperature control value have a mapping relationship, which is obtained according to a prior calibration experiment. Therefore, after obtaining the actual battery temperature, the temperature control calibration value can be found from the mapping relationship. Further, the temperature adjustment component is controlled to reduce the temperature of the air entering the power battery according to the temperature control calibration value.

[0051] S202, determining, from a comprehensive control model, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for introducing air into the power battery for cooling the power battery according to the actual battery temperature and the target battery temperature.

[0052] The comprehensive control model is fitted with the control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor. Specifically, the comprehensive control model is:

[0053] K1·K2=T / T0

[0054] Wherein, K1 is the rotation speed adjustment factor, K2 is the aperture adjustment factor, T is the battery target temperature, and T0 is the battery actual temperature.

[0055] According to the proportional relationship between the speed adjustment factor K1 and the aperture adjustment factor K2 in the comprehensive control model, the blower power and the jet hole aperture can be limited and adjusted according to the proportional relationship.

[0056] In an optional implementation, the speed adjustment factor K1 and the aperture adjustment factor K2 also have a weight ratio relationship model, specifically:

[0057] K1 / K2=α1 / α2

[0058] Among them, α1 is the weight of the rotation speed adjustment factor, α2 is the weight of the aperture adjustment factor, and α1+α2=1.

[0059] According to the proportional relationship between the speed adjustment factor K1 and the aperture adjustment factor K2 in the comprehensive control model, combined with the weight proportion relationship model, the specific values ​​of the speed adjustment factor K1 and the aperture adjustment factor K2 can be determined, and the blower power and the jet hole aperture can be further limited and adjusted.

[0060] S203, controlling the output power of the blower based on the speed adjustment factor, and controlling the aperture size of the jet hole based on the aperture adjustment factor, so as to comprehensively cool the power battery.

[0061] In the process of controlling the output power of the blower based on the speed adjustment factor K1, according to the speed adjustment factor and the power control model: Control the output power of the blower; wherein N is the output power of the blower, Q is the actual air volume of the blower, P is the back pressure of the blower; η is the efficiency of the blower, The actual air volume of the blower is obtained; wherein K1 is the speed adjustment factor, n is the actual speed of the blower, n0 is the target speed of the blower, and Q0 is the target air volume of the blower.

[0062] Specifically, the speed adjustment factor K1 is first used to adjust the actual air volume of the blower. Among them, the actual air volume of the blower is obtained according to the ratio of the first product and the second product. The first product is: the product of the speed adjustment factor K1 and the actual speed of the blower n, and the second product is: the product of the blower target air volume Q0 and the blower target speed n0. Then the blower output power is determined according to the actual air volume Q of the blower combined with the power control model. Among them, the blower output power is obtained according to the ratio of the third product and the fourth product. The third product is: the product of the actual air volume Q of the blower and the blower back pressure P; the fourth product is: the product of the blower speed ratio and the blower efficiency.

[0063] In the process of controlling the aperture size of the jet hole based on the aperture adjustment factor, the aperture adjustment factor and the aperture adjustment model are combined. Control the aperture size of the jet hole; wherein D is the aperture of the jet hole, Nu is the Nusselt number, K is the thermal conductivity of the fluid, h is the convection heat transfer coefficient, and K2 is the aperture adjustment factor.

[0064] Specifically, the aperture of the jet hole is obtained according to the ratio of the fifth product and the sixth product. The fifth product is the product of the Nusselt number Nu and the fluid thermal conductivity K, and the sixth product is the product of the convection heat transfer coefficient h and the aperture adjustment factor K2.

[0065] Specifically, the jet hole adopts the principle of jet impact cooling. By adding jet holes in the power battery, through jet impact cooling, on the one hand, the heat exchange coefficient between the airflow and the battery cell can be enhanced, and on the other hand, the throttling effect can be used to further reduce the temperature of the air to meet the control of battery temperature under extreme working conditions.

[0066] Furthermore, the aperture size of the jet hole of this embodiment is adjustable. The number of jet holes is not limited, and one jet hole can correspond to one battery cell, or one-to-many or many-to-one. The aperture size of the jet hole changes according to the temperature, and the controller and the motor adjust the aperture size.

[0067] as follows Figure 3 , which is a schematic structural diagram of the jet hole 103 .

[0068] A plurality of rotating blades 301 are installed in the jet hole 103 . The rotating blades 301 are controlled by a controller and a motor 302 to move so as to change the aperture of the jet hole 103 .

[0069] Specifically, a plurality of rotating blades 301 form a spiral shape around the jet hole 103. The rotating blades 301 are driven by the transmission assembly 303 to move so that the aperture of the jet hole 103 becomes larger or smaller.

[0070] The transmission assembly 303 is controlled by the controller and the motor 302. The controller adjusts the power of the motor 302 according to the aperture, and the motor 302 controls the transmission assembly 303 according to the power to move the rotating blade 301, thereby changing the aperture of the jet hole 103. The aperture and the power of the motor 302 also have calibration values, and the corresponding power of the motor 302 can be determined according to the desired aperture, so as to control the jet hole 103 to reach the desired aperture.

[0071] In this embodiment, the aperture size is adjusted according to the temperature signal fed back by the power battery, which can not only control the air flow more precisely, but also change the impact jet effect, and can meet the battery temperature regulation under complex and multi-operating conditions.

[0072] In the second aspect, based on the same inventive concept as the air cooling control method of a power battery provided in the embodiment of the first aspect, the embodiment of the present invention further provides an air cooling control system for a power battery, see Figure 4 ,include:

[0073] The monitoring module 401 is used to monitor the actual battery temperature of the power battery in real time;

[0074] A determination module 402 is used to determine, from a comprehensive control model, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by introducing air according to the actual battery temperature and the target battery temperature; wherein the comprehensive control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor;

[0075] The regulating module 403 is used to control the output power of the blower based on the speed regulating factor, and control the aperture size of the jet hole based on the aperture regulating factor, so as to comprehensively cool the power battery.

[0076] It should be noted that an embodiment of the present invention provides an air cooling control system for a power battery, in which the specific manner in which each module performs operations has been described in detail in the method embodiment provided in the first aspect above. The specific implementation process can refer to the method embodiment provided in the first aspect above, and will not be elaborated here.

[0077] In the third aspect, based on the same inventive concept as the air cooling control method for a power battery provided in the embodiment of the first aspect mentioned above, an embodiment of the present invention further discloses a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0078] In the fourth aspect, based on the same inventive concept as the air cooling control method for a power battery provided in the embodiment of the first aspect mentioned above, an embodiment of the present invention further discloses an electric vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of any of the methods described above when executing the program.

[0079] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0080] The technical solution designed in the present invention combines the actual battery temperature of the power battery and the comprehensive control model to fit the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet hole for letting air into the power battery for cooling, so as to comprehensively cool the power battery, thereby quickly cooling the power battery and meeting the requirements of harsh and changeable thermal environments. The air cooling system is intelligent and efficient, and can achieve efficient cooling of the power battery under multiple working conditions, thereby improving the thermal safety and service life of the battery.

[0081] The technical solution designed by the present invention, on the one hand, can utilize the throttling impact effect of the jet hole to enhance the ability of heat exchange, thereby enhancing the heat exchange of the battery cell, and can change the battery temperature very quickly to achieve rapid cooling or heating effects. On the other hand, a variety of temperature feedback control logics can be obtained to comprehensively adjust the temperature of the power battery. By feeding back the battery temperature signal to the temperature control component, the air temperature is changed; by feeding back the battery temperature signal to the blower and the jet hole, the throttling hole size is adjusted in real time, the impact jet effect is changed, and truly intelligent battery temperature intelligent control is achieved. The solution provided by the present invention can effectively cool down the power battery and has broad application prospects and market potential.

[0082] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0083] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for controlling air cooling of a power battery, characterized in that: The method comprises: Real-time monitoring of the actual battery temperature of the power battery; According to the actual battery temperature and the target battery temperature, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by introducing air are determined from a comprehensive control model; wherein the comprehensive control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor; The output power of the blower is controlled based on the speed adjustment factor, and the aperture size of the jet hole is controlled based on the aperture adjustment factor, so as to comprehensively cool the power battery.

2. The method according to claim 1, characterized in that The comprehensive control model is: K1·K2=T / T0; wherein K1 is the rotation speed adjustment factor, K2 is the aperture adjustment factor, T is the battery target temperature, and T0 is the battery actual temperature.

3. The method according to claim 1, characterized in that The step of controlling the output power of the blower based on the speed adjustment factor specifically includes: According to the speed adjustment factor and the power control model: Control the output power of the blower; wherein N is the output power of the blower, Q is the actual air volume of the blower, P is the back pressure of the blower; η is the efficiency of the blower, The actual air volume of the blower is obtained; wherein K1 is the speed adjustment factor, n is the actual speed of the blower, n0 is the target speed of the blower, and Q0 is the target air volume of the blower.

4. The method according to claim 1, characterized in that The controlling the aperture size of the jet hole based on the aperture adjustment factor specifically includes: Combining the pore size adjustment factor and the pore size adjustment model Control the aperture size of the jet hole; wherein D is the aperture of the jet hole, Nu is the Nusselt number, K is the thermal conductivity of the fluid, h is the convection heat transfer coefficient, and K2 is the aperture adjustment factor.

5. The method according to claim 1, characterized in that After real-time monitoring of the actual battery temperature of the power battery, the method further includes: Determining a temperature control calibration value according to the actual battery temperature; The temperature regulating component is controlled to reduce the temperature of the air entering the power battery according to the temperature control calibration value.

6. The method according to claim 1, characterized in that A jet hole is installed above the battery cell of the power battery, and the jet hole impacts the air in the air duct to the battery cell to cool the battery cell; The temperature adjustment component is connected to the air inlet of the air duct to cool the air; The blower is connected to the power battery and is used to control the air flow rate in the power battery.

7. The method according to claim 1 or 6, characterized in that A plurality of rotating blades are installed in the jet hole, and the rotating blades are controlled by a control motor to move so as to change the aperture of the jet hole.

8. A wind cooling control system for a power battery, characterized in that: include: Monitoring module, used to monitor the actual battery temperature of the power battery in real time; a determination module, configured to determine, from a comprehensive control model, a speed adjustment factor of a blower for cooling the power battery and an aperture adjustment factor of a jet hole for cooling the power battery by introducing air according to the actual battery temperature and the target battery temperature; wherein the comprehensive control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor; The regulating module is used to control the output power of the blower based on the speed regulating factor, and to control the aperture size of the jet hole based on the aperture regulating factor, so as to comprehensively cool the power battery.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

10. An electric vehicle, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 7 are implemented.

Images