A method and system for controlling air cooling of a power battery, a medium and an electric vehicle

Abstract

The application discloses a kind of wind cooling control method, system, medium and electric automobile of power battery, the method includes: the actual battery temperature of real-time monitoring power battery;According to the actual battery temperature and target battery temperature, from the comprehensive control model, the speed adjustment factor of the air blower for cooling the power battery and the aperture adjustment factor of the jet hole for cooling the power battery by air inlet are determined;Wherein, the comprehensive control model is fitted with the control logic between battery temperature, speed adjustment factor, aperture adjustment factor;Based on the speed adjustment factor, the output power of the air blower is controlled, while based on the aperture adjustment factor, the aperture size of the jet hole is controlled, to carry out comprehensive cooling to the power battery.

Description

Technical Field

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

[0002] Currently, electric vehicles generally rely on power batteries for their driving range. When an electric vehicle operates under complex and variable conditions such as high speed, low speed, acceleration, and deceleration, the power battery generates heat during discharge, causing its temperature to rise. This directly affects many of the battery's characteristic parameters, such as internal resistance, voltage, state of charge (SOC), usable capacity, charge / discharge efficiency, and battery life. Therefore, battery cooling has become a crucial aspect of battery system development.

[0003] Existing electric vehicle battery packs mainly adopt air cooling, using external air as the heat exchange medium. The external air is cooled passively or actively before entering the battery system for heat exchange. This method has limited cooling effect on the battery and cannot effectively improve the battery's cooling efficiency. Summary of the Invention

[0004] To address or partially address the technical problem of ineffectively improving battery cooling efficiency, this invention provides a method, system, medium, and electric vehicle for air-cooled power batteries. By combining the actual battery temperature and a comprehensive control model, the speed adjustment factor of the blower used to cool the power battery and the aperture adjustment factor of the jet orifice used to cool the air introduced into the power battery are fitted, resulting in comprehensive cooling of the power battery. This rapid cooling can meet the requirements of harsh and variable thermal environments, achieve efficient cooling of the power battery under multiple operating conditions, and improve the battery's thermal safety and service life.

[0005] To address the aforementioned technical problems, a first aspect of the present invention discloses a method for controlling the air cooling of a power battery, the method comprising:

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

[0007] Based on the actual battery temperature and the target battery temperature, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air are determined from the integrated control model; wherein, the integrated control model is fitted with control logic between battery temperature, speed adjustment factor and aperture adjustment factor.

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

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

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

[0011] Based on the speed adjustment factor and the power control model: The output power of the blower is controlled; where 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, and η is the blower efficiency. The actual air volume of the blower is obtained; where 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 orifice size based on the orifice adjustment factor specifically includes:

[0013] Combining the pore size adjustment factor and pore size adjustment model The orifice size of the jet orifice is controlled; where D is the orifice size, Nu is the Nusselt number, K is the thermal conductivity of the fluid, h is the convective heat transfer coefficient, and K2 is the orifice size adjustment factor.

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

[0015] Determine the temperature control calibration value based on the actual battery temperature;

[0016] The temperature control component cools 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 pipe onto the battery cell to cool the battery cell;

[0018] The temperature regulating component is connected to the air inlet of the air duct and is used to cool the air.

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

[0020] Optionally, a plurality of rotating blades are installed inside the jet orifice, and the rotating blades are controlled by a control motor to move in order to change the diameter of the jet orifice.

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

[0022] The monitoring module is used to monitor the actual battery temperature of the power battery in real time.

[0023] The determination module is used to determine, based on the actual battery temperature and the target battery temperature, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air into it, from the integrated control model; wherein, the integrated control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor.

[0024] The adjustment module is used to control the output power of the blower based on the speed adjustment factor, and at the same time control the orifice size of the jet orifice based on the orifice adjustment factor, so as to comprehensively cool the power battery.

[0025] A third aspect of the present invention discloses a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the above-described method.

[0026] A fourth aspect of the present invention discloses an electric vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

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

[0028] This invention provides a method, system, medium, and electric vehicle for air-cooling control of power batteries. By combining the actual battery temperature and a comprehensive control model, the speed adjustment factor of the blower used to cool the power battery and the aperture adjustment factor of the jet orifice used to cool the power battery by introducing air into the power battery are fitted. This allows for comprehensive cooling of the power battery, thereby achieving rapid cooling that can meet the requirements of harsh and variable thermal environments, realize efficient cooling of the power battery under multiple operating conditions, and improve the thermal safety and service life of the battery.

[0029] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0030] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic diagram of the relevant structure in an air-cooled control system according to an embodiment of the present invention is shown;

[0032] Figure 2 A flowchart of a power battery air-cooling control method according to an embodiment of the present invention is shown;

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

[0034] Figure 4 A block diagram of an air-cooled control system according to an embodiment of the present invention is shown. Detailed Implementation

[0035] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0036] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

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

[0038] To further understand the implementation scheme of the present invention, the relevant structure of the power battery in this embodiment will be introduced below.

[0039] See Figure 1 This is a schematic diagram of the relevant structure in the air-cooled control system of the present invention.

[0040] The air-cooled control system includes: an intake assembly (not shown in the figure), a temperature control assembly 101, a power battery 102, several 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 regulation component is connected to the air duct and is used to cool the air entering the power battery 102.

[0043] A jet orifice 103 is installed above the battery cell of the power battery 102. The jet orifice 103 impacts the air in the air duct onto the battery cell to cool it. Furthermore, the temperature regulation component first cools the air in the air duct, while the orifice 103, with its adjustable diameter, impacts the battery cell with air to cool it. The orifice diameter of the jet orifice 103 is positively correlated with the cooling effect; the larger the orifice diameter, the better the cooling effect.

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

[0045] The power battery 102 is equipped with a temperature sensor to measure the actual battery temperature of the power battery 102.

[0046] The working principle of the air-cooled control system is as follows: The temperature sensor inside the power battery 102 measures the actual temperature of the battery. On the one hand, it transmits the temperature signal to the temperature control component 101 to adjust the temperature of the incoming air; on the other hand, it uses the temperature signal to comprehensively adjust the power (or speed) of the blower 104 and the orifice diameter of the jet orifice 103. Specifically, the power of the blower 104 is adjusted based on the temperature signal to regulate the airflow, and the orifice diameter of the jet orifice 103 is adjusted based on the temperature signal.

[0047] To further illustrate and explain the present invention, the following is provided: Figure 2 As shown, the air-cooling control method for a power battery according to an embodiment of the present invention includes the following steps:

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

[0049] The actual battery temperature of a power battery is obtained by measuring a temperature sensor. Specifically, the actual temperature of some or all of the battery cells is measured, and the average temperature is calculated as the actual battery temperature. Alternatively, the actual temperature of a specific battery cell can be randomly measured to obtain the actual battery temperature.

[0050] After real-time monitoring of the actual battery temperature, the temperature signal is transmitted to the temperature control component 101 to adjust the temperature of the incoming air. Specifically, a temperature control calibration value is determined based on the actual battery temperature. There is a mapping relationship between the battery temperature and the temperature control value, derived from prior calibration experiments. 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 cool the air entering the power battery according to the temperature control calibration value.

[0051] S202, based on the actual battery temperature and the target battery temperature, determine from the integrated control model the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air.

[0052] The integrated control model incorporates control logic relating battery temperature, speed adjustment factor, and aperture adjustment factor. Specifically, the integrated control model is as follows:

[0053] K1·K2=T / T0

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

[0055] Based on the proportional relationship between the speed adjustment factor K1 and the aperture adjustment factor K2 in the integrated control model, the blower power and the jet orifice aperture can be limited and adjusted according to this proportional relationship.

[0056] In one optional implementation, the speed adjustment factor K1 and the aperture adjustment factor K2 also have a weighted proportional relationship model, specifically:

[0057] K1 / K2=α1 / α2

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

[0059] Based on the proportional relationship between the speed adjustment factor K1 and the aperture adjustment factor K2 in the integrated control model, and combined with the weight ratio relationship model, the specific values ​​of the speed adjustment factor K1 and the aperture adjustment factor K2 can be determined, and the power of the blower and the aperture of the jet orifice can be further restricted.

[0060] S203, the output power of the blower is controlled based on the speed adjustment factor, and the orifice size of the jet orifice is controlled based on the orifice 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: The output power of the blower is controlled; where 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, and η is the blower efficiency. The actual air volume of the blower is obtained; where 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 actual airflow of the blower is first adjusted using the speed adjustment factor K1. The actual airflow is obtained by the ratio of the first and second products. The first product is the product of the speed adjustment factor K1 and the actual blower speed n; the second product is the product of the target airflow Q0 and the target blower speed n0. Then, the blower output power is determined based on the actual airflow Q and the power control model. The blower output power is obtained by the ratio of the third and fourth products. The third product is the product of the actual blower airflow Q 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 orifice size of the jet orifice based on the orifice adjustment factor, the orifice adjustment factor and the orifice adjustment model are combined. The orifice size of the jet orifice is controlled; where D is the orifice size, Nu is the Nusselt number, K is the thermal conductivity of the fluid, h is the convective heat transfer coefficient, and K2 is the orifice size adjustment factor.

[0064] Specifically, the orifice diameter is obtained by the ratio of the fifth product and the sixth product. The fifth product is the product of the Nusselt number Nu and the thermal conductivity K of the fluid, and the sixth product is the product of the convective heat transfer coefficient h and the orifice diameter adjustment factor K2.

[0065] Specifically, the jet orifice adopts the principle of jet impact cooling. By adding jet orifices to the power battery and cooling it through jet impact, the heat transfer coefficient between the airflow and the battery cell can be enhanced, and the air temperature can be further reduced by utilizing the throttling effect, thus meeting the battery temperature control requirements under extreme operating conditions.

[0066] Furthermore, the aperture size of the jet orifice in this embodiment is adjustable. The number of jet orifices is unlimited; one orifice can correspond to one battery cell, or a one-to-many or many-to-one configuration. The aperture size of the jet orifice is adjusted by the controller and motor according to temperature changes.

[0067] as follows Figure 3 The diagram shown is a schematic diagram of the jet hole 103.

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

[0069] Specifically, several rotating blades 301 form a swirling shape around the jet orifice 103. The rotating blades 301 move under the transmission action of the transmission assembly 303, so that the diameter of the jet orifice 103 increases or decreases.

[0070] The transmission assembly 303 is controlled by a controller and a motor 302. The controller adjusts the power of the motor 302 according to the orifice diameter, and the motor 302 controls the transmission assembly 303 according to this power to move the rotating blade 301, thereby changing the orifice diameter of the jet orifice 103. The orifice diameter and the power of the motor 302 also have calibrated values. The corresponding power of the motor 302 can be determined according to the desired orifice diameter, thereby controlling the jet orifice 103 to achieve the desired orifice diameter.

[0071] In this embodiment, adjusting the aperture size based on the temperature signal fed back from the power battery not only allows for more precise control of airflow but also alters the impact jet effect, thus meeting the requirements for battery temperature regulation under complex multi-condition environments.

[0072] Secondly, based on the same inventive concept as the air-cooling control method for a power battery provided in the first aspect of the embodiments described above, the present invention also provides an air-cooling control system for a power battery, see below. Figure 4 ,include:

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

[0074] The determination module 402 is used to determine, based on the actual battery temperature and the target battery temperature, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air into it from the integrated control model; wherein, the integrated control model is fitted with control logic between the battery temperature, the speed adjustment factor and the aperture adjustment factor.

[0075] The adjustment module 403 is used to control the output power of the blower based on the speed adjustment factor, and at the same time control the orifice size of the jet orifice based on the orifice adjustment factor, so as to comprehensively cool the power battery.

[0076] It should be noted that the specific operation methods of each module in the air-cooled control system for a power battery provided in the embodiments of the present invention have been described in detail in the method embodiments provided in the first aspect above. The specific implementation process can be referred to the method embodiments provided in the first aspect above, and will not be described in detail here.

[0077] Thirdly, based on the same inventive concept as the air-cooling control method for power batteries provided in the first aspect of the embodiments described above, the present invention also discloses a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0078] Fourthly, based on the same inventive concept as the air-cooling control method for power batteries provided in the first aspect of the embodiments described above, the present invention also discloses an electric vehicle, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of any of the methods described above.

[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 this invention combines the actual battery temperature of the power battery with a 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 orifice for cooling the power battery by introducing air into the power battery. This comprehensive cooling of the power battery enables rapid cooling, meeting the requirements of harsh and variable thermal environments. Furthermore, the air-cooling system is intelligent and efficient, enabling efficient cooling of the power battery under multiple operating conditions, thereby improving the thermal safety and service life of the battery.

[0081] The technical solution designed in this invention, on the one hand, can enhance heat exchange capacity by utilizing the throttling impact effect of the jet orifice, thereby enhancing the heat exchange of the battery cell and enabling extremely rapid changes in battery temperature to achieve rapid cooling or heating effects. On the other hand, it can obtain multiple temperature feedback control logics to comprehensively regulate the temperature of the power battery. By feeding back the battery temperature signal to the temperature control component to change the air temperature; by feeding back the battery temperature signal to the blower and jet orifice to adjust the size of the throttling orifice in real time and change the impact jet effect, truly achieving intelligent battery temperature control. The solution provided by this invention can effectively cool down the power battery and has broad application prospects and market potential.

[0082] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0083] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for controlling the air cooling of a power battery, characterized in that, The method includes: Real-time monitoring of the actual battery temperature of the power battery; Based on the actual battery temperature and the target battery temperature, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air are determined from the integrated control model; wherein, the integrated control model is fitted with control logic between battery temperature, speed adjustment factor and aperture adjustment factor. The output power of the blower is controlled based on the speed adjustment factor, and the orifice size of the jet orifice is controlled based on the orifice adjustment factor to comprehensively cool the power battery. The power battery has a jet hole installed above the battery cell. The jet hole impacts the battery cell with air from the air duct to cool it. Several rotating blades are installed inside the jet hole. The rotating blades are controlled by a control motor to change the diameter of the jet hole. A temperature regulating component is connected to the air inlet of the air duct to cool the air. A blower is connected to the power battery to control the air flow rate in the power battery.

2. The method as described in claim 1, characterized in that, The comprehensive control model is: ; wherein, K 1 is the rotation speed adjustment factor, K 2 is the aperture adjustment factor, T T is the battery target temperature, T T is the battery actual temperature.

3. The method of claim 1, wherein, The control of the blower's output power based on the speed adjustment factor specifically includes: According to the rotation speed adjustment factor and the power control model: , control the output power of the air blower; wherein, N is the output power of the air blower, Q is the actual air volume of the air blower, P is the back pressure of the air blower; η is the efficiency of the air blower, , obtain the actual air volume of the air blower; wherein, is the rotation speed adjustment factor, n is the actual rotation speed of the air blower, is the target rotation speed of the air blower, is the target air volume of the air blower.

4. The method of claim 1, wherein, The control of the jet orifice size based on the orifice adjustment factor specifically includes: combining the orifice adjustment factor and the orifice adjustment model controlling the orifice size of the fluidic orifice; wherein, D N is the fluidic orifice orifice diameter, Nu N is the Nusselt number, K N is the fluid thermal conductivity, h N is the convective heat transfer coefficient, K 2 is the orifice adjustment factor.

5. The method of claim 1, wherein, After real-time monitoring of the actual battery temperature of the power battery, the method further includes: Determine the temperature control calibration value based on the actual battery temperature; The temperature control component cools the air entering the power battery according to the temperature control calibration value.

6. A wind-cooled control system for a power battery, characterized in that, include: The monitoring module is used to monitor the actual battery temperature of the power battery in real time. The determination module is used to determine, based on the actual battery temperature and the target battery temperature, the speed adjustment factor of the blower for cooling the power battery and the aperture adjustment factor of the jet orifice for cooling the power battery by introducing air into it, from the integrated control model; wherein, the integrated control model is fitted with control logic between the battery temperature, the speed adjustment factor, and the aperture adjustment factor. The adjustment module is used to control the output power of the blower based on the speed adjustment factor, and at the same time control the orifice size of the jet orifice based on the orifice adjustment factor, so as to comprehensively cool the power battery. The power battery has a jet hole installed above the battery cell. The jet hole impacts the battery cell with air from the air duct to cool it. Several rotating blades are installed inside the jet hole. The rotating blades are controlled by a control motor to change the diameter of the jet hole. A temperature regulating component is connected to the air inlet of the air duct to cool the air. A blower is connected to the power battery to control the air flow rate in the power battery.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method according to any one of claims 1-5.

8. 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, it implements the steps of the method according to any one of claims 1-5.

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