Heat dissipation method and device for power battery in vehicle, storage medium and processor

Abstract

The application provides a heat dissipation method and device for a power battery in a vehicle, a storage medium and a processor. The power battery is located in a battery compartment. The method comprises the following steps: detecting whether the power battery is in a predetermined working state; detecting the temperature in the battery compartment when the power battery is in the predetermined working state; determining a PWM wave with a predetermined duty cycle according to the temperature of the battery compartment; and controlling the operation of a fan in the battery compartment by using the PWM wave. The method controls the operation of the fan by using the PWM wave, thereby avoiding the problem of poor safety caused by the driver controlling the on-off of the fan. In addition, the method adjusts the duty cycle of the PWM wave according to the temperature of the battery compartment, and then controls the rotating speed of the fan according to the duty cycle of the PWM wave, that is, adjusts the rotating speed of the fan according to the temperature of the battery compartment, thereby improving the heat dissipation efficiency of the power battery compartment, reducing energy consumption, improving the charging and discharging performance of the battery, improving the driving range of the vehicle, and reducing the risk of accidents of the vehicle.

Description

Technical Field

[0001] This application relates to the field of battery heat dissipation technology, and more specifically, to a heat dissipation method, device, storage medium, and processor for a power battery in a vehicle. Background Technology

[0002] In the existing technology, the heat dissipation method for power batteries is to install a cooling fan at one end of the battery box and leave a ventilation hole at the other end, so that the air can flow faster between the gaps of the battery cells, thereby carrying away the high heat generated by the battery cells when they are working.

[0003] In most vehicles, the power battery is located in the rear compartment. The rear compartment door has few ventilation grilles, resulting in a relatively enclosed space with poor air convection and heat dissipation. Combined with the high temperatures and humidity in Chengdu during summer, where road surface temperatures can reach over 40 degrees Celsius, the temperature in the rear compartment will be even higher, affecting battery performance and increasing the risk of overheating alarms. Although this model is designed with a driver-operated fan switch, allowing the driver to manually adjust the switch to cool the rear compartment by observing the cell temperature on the instrument panel, once the switch is turned on, the fan operates at maximum speed. This not only increases the driver's workload and consumes energy from the vehicle's energy storage system, but also affects driving safety when operating the switch.

[0004] The information disclosed above in the background section is only intended to enhance the understanding of the background art of the art described herein. Therefore, the background art may contain certain information that does not constitute prior art known to those skilled in the art in this country. Summary of the Invention

[0005] The main objective of this application is to provide a method, device, storage medium, and processor for cooling a power battery in a vehicle, in order to solve the problem of poor safety caused by the need for the driver to operate the fan switch to cool the power battery in the prior art.

[0006] According to one aspect of the present invention, a method for cooling a power battery in a vehicle is provided, the power battery being located within a battery compartment, the method comprising: detecting whether the power battery is in a predetermined operating state; detecting the temperature within the battery compartment when the power battery is in the predetermined operating state; determining a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment; and controlling a fan to operate using the PWM wave, the fan being located within the battery compartment.

[0007] Furthermore, detecting whether the power battery is in a predetermined operating state includes: detecting whether the vehicle's instrument module is working normally; if the instrument module is working normally, detecting whether the vehicle's emergency stop switch is pressed; if the emergency stop switch is not pressed, detecting whether the battery compartment door is closed; if the battery compartment door is closed, detecting whether the power battery's discharge current or charging current is greater than 0; if the power battery's discharge current or charging current is greater than 0, determining that the power battery is in the predetermined operating state.

[0008] Furthermore, when the emergency stop switch is not pressed, detecting whether the battery compartment door is closed includes: using a limit switch to detect whether the battery compartment door is closed.

[0009] Furthermore, the vehicle also includes a battery management module, which, when the battery compartment door is closed, detects whether the discharge current or the charging current of the power battery is greater than 0, including: the battery management module detecting the status information of the power battery; sending the status information to the instrument module; and the instrument module determining whether the discharge current or the charging current of the power battery is greater than 0 based on the status information.

[0010] Further, determining a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment includes: determining the predetermined duty cycle to be 0 when the temperature inside the battery compartment is less than or equal to a first temperature threshold; and determining the predetermined duty cycle to be greater than 0 when the temperature inside the battery compartment is greater than the first temperature threshold.

[0011] Further, the first temperature threshold is 27°C. Determining the predetermined duty cycle to be greater than 0 when the temperature inside the battery compartment is greater than the first temperature threshold includes: determining the duty cycle to be between 40% and 60% when the temperature inside the battery compartment is between 28 and 32°C; determining the duty cycle to be between 65% and 75% when the temperature inside the battery compartment is between 33 and 36°C; determining the duty cycle to be between 85% and 95% when the temperature inside the battery compartment is between 37 and 40°C; and determining the duty cycle to be between 96% and 100% when the temperature inside the battery compartment is greater than 41°C.

[0012] Furthermore, controlling the fan's operation using the PWM wave includes: controlling the fan to operate at a first speed (between 750 and 850 rpm) when the duty cycle is between 40% and 60%; controlling the fan to operate at a second speed (between 1700 and 1900 rpm) when the duty cycle is between 65% and 75%; controlling the fan to operate at a third speed (between 2800 and 3100 rpm) when the duty cycle is between 85% and 95%; and controlling the fan to operate at a fourth speed (between 3300 and 3500 rpm) when the duty cycle is between 96% and 100%.

[0013] Furthermore, after controlling the operation of the fan using the PWM wave, the method further includes: detecting the wind speed inside the battery compartment; and adjusting the opening degree of the louvers of the battery compartment according to the wind speed.

[0014] Furthermore, adjusting the opening degree of the louvers of the battery compartment according to the wind speed includes: controlling the opening degree of the louvers between 15% and 25% when the wind speed is less than 6.5 m / s; controlling the opening degree of the louvers between 40% and 60% when the wind speed is between 6.5 and 14 m / s; controlling the opening degree of the louvers between 70% and 90% when the wind speed is between 14 and 20 m / s; and controlling the opening degree of the louvers between 75% and 100% when the wind speed is greater than 20 m / s.

[0015] Furthermore, the fan has multiple components, including at least a first fan and a second fan. After controlling the first fan to operate using the PWM wave, the method further includes: detecting the temperature change of the battery compartment within a predetermined time; and controlling the second fan to operate using the PWM wave if the temperature inside the battery compartment does not drop by a predetermined value.

[0016] According to another aspect of the present invention, a heat dissipation device for a power battery in a vehicle is also provided, wherein the power battery is located in a battery compartment, and includes: a first detection unit for detecting whether the power battery is in a predetermined operating state; a second detection unit for detecting the temperature inside the battery compartment when the power battery is in the predetermined operating state; a determination unit for determining a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment; and a first control unit for controlling a fan to operate using the PWM wave, wherein the fan is located inside the battery compartment.

[0017] According to another aspect of the present invention, a storage medium is also provided, the storage medium including a stored program, wherein the program executes any one of the methods described.

[0018] According to another aspect of the present invention, a processor is also provided, the processor being configured to run a program, wherein the program, when running, executes any of the methods described.

[0019] In this embodiment of the invention, the above-described heat dissipation method first detects whether the power battery is in a predetermined operating state to prevent the fan from starting accidentally. Then, when the power battery is in the predetermined operating state, the temperature inside the power battery compartment is detected. Next, a PWM wave with a predetermined duty cycle is determined based on the temperature of the power battery compartment; that is, the duty cycle of the PWM wave is adjusted according to the temperature of the power battery compartment. Finally, the PWM wave is used to control the fan's operation; that is, the fan speed is controlled according to the duty cycle of the PWM wave. This heat dissipation method, by controlling the fan's operation with a PWM wave, avoids the safety issues caused by the driver manually switching the fan on and off to cool the power battery. Furthermore, by adjusting the duty cycle of the PWM wave according to the temperature of the power battery compartment and then controlling the fan speed according to the PWM wave's duty cycle, the method improves the heat dissipation efficiency inside the power battery compartment and reduces energy consumption, thereby improving the battery's charging and discharging performance, increasing the vehicle's driving range, and effectively reducing the risk of vehicle accidents. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 A flowchart illustrating a heat dissipation method for a power battery in a vehicle according to an embodiment of this application is shown;

[0022] Figure 2 A schematic diagram of a heat dissipation device for a power battery in a vehicle according to an embodiment of this application is shown;

[0023] Figure 3 A schematic diagram of a control circuit corresponding to a heat dissipation method for a power battery in a vehicle according to an embodiment of this application is shown.

[0024] Figure 4 A logic diagram of a heat dissipation method for a power battery in a vehicle in the prior art is shown; and

[0025] Figure 5 A logic diagram of a heat dissipation method for a power battery in a vehicle according to an embodiment of this application is shown.

[0026] The above figures include the following reference numerals:

[0027] 10. Power supply; 20. Main power switch; 30. Limit switch; 40. Instrument module; 50. Temperature sensor; 60. Louver motor; 70. First fan; 80. Second fan. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0031] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be an intermediate element present. Furthermore, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element via a third element.

[0032] As mentioned in the background section, the prior art requires the driver to operate the fan switch to cool the power battery, resulting in poor safety. In order to solve the above problems, in a typical embodiment of this application, a method, device, storage medium and processor for cooling power batteries in a vehicle are provided.

[0033] According to an embodiment of this application, a method for heat dissipation of a power battery in a vehicle is provided.

[0034] Figure 1This is a flowchart of a heat dissipation method for a power battery in a vehicle according to an embodiment of this application. The power battery is located inside the battery compartment, as shown below. Figure 1 As shown, the method includes the following steps:

[0035] Step S101: Detect whether the power battery is in the predetermined working state;

[0036] Step S102: When the power battery is in the predetermined working state, the temperature inside the power battery compartment is detected.

[0037] Step S103: Determine a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment.

[0038] Step S104: The fan is controlled to operate using the aforementioned PWM wave, and the fan is located inside the aforementioned battery compartment.

[0039] In the aforementioned heat dissipation method, the first step is to detect whether the power battery is in a predetermined operating state to prevent the fan from starting accidentally. Then, while the power battery is in the predetermined operating state, the temperature inside the power battery compartment is detected. Next, a PWM wave with a predetermined duty cycle is determined based on the temperature of the power battery compartment; that is, the duty cycle of the PWM wave is adjusted according to the temperature of the power battery compartment. Finally, the PWM wave is used to control the fan's operation, i.e., the fan speed is controlled according to the duty cycle of the PWM wave. This heat dissipation method, by controlling the fan's operation with a PWM wave, avoids the safety issues caused by the driver manually switching the fan on and off to cool the power battery. Furthermore, by adjusting the duty cycle of the PWM wave according to the temperature of the power battery compartment and then controlling the fan speed according to the PWM wave's duty cycle, the method improves the heat dissipation efficiency within the power battery compartment, reduces energy consumption, thereby improving the battery's charging and discharging performance, increasing the vehicle's driving range, and effectively reducing the risk of vehicle accidents.

[0040] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0041] It should also be noted that a temperature sensor is used to detect the temperature inside the power battery compartment. The aforementioned fan can be a shaft-driven fan, and those skilled in the art can select appropriate temperature sensors and fans based on actual conditions. Furthermore, a fan guard is added to the aforementioned fan to prevent accidental injury from the fan blades, further improving safety.

[0042] In one embodiment of this application, detecting whether a power battery is in a predetermined working state includes: detecting whether the vehicle's instrument module is working normally; if the instrument module is working normally, detecting whether the vehicle's emergency stop switch is pressed; if the emergency stop switch is not pressed, detecting whether the battery compartment door is closed; if the battery compartment door is closed, detecting whether the power battery's discharge current or charging current is greater than 0; if the power battery's discharge current or charging current is greater than 0, determining that the power battery is in the predetermined working state. This method can avoid safety accidents caused by accidental fan startup during vehicle maintenance. For example, if the battery compartment door is open, accidental fan startup can easily lead to injury from the fan blades. Furthermore, since the power battery's temperature continuously rises when it is charging and discharging, this method uses a power battery discharge current or charging current greater than 0 as one of the necessary conditions for determining that the power battery is in a predetermined working state. This avoids problems such as inaccurate temperature detection values, fluctuating temperature values, or damaged temperature sensors causing abnormal fan operation or frequent start-stop cycles, thereby improving the fan's lifespan.

[0043] It should be noted that if the vehicle's instrument panel malfunctions, the instrument panel needs to be inspected to restore its normal operation. When the vehicle's emergency stop switch is pressed, all fans will immediately stop working.

[0044] It should also be noted that the instrument module features a human-machine interface mode, allowing the driver to intuitively view parameters such as the battery compartment temperature and rear compartment fan speed, including audible warnings. The instrument module can also guide the driver in driving safely and cultivate good driving habits within this human-machine interface mode.

[0045] In one embodiment of this application, detecting whether the battery compartment is closed when the emergency stop switch is not pressed includes: using a limit switch to detect whether the battery compartment door is closed. Specifically, the limit switch is installed on the battery compartment door, and the collision of the door opening or closing causes the contacts of the limit switch to actuate, thereby connecting or disconnecting the control circuit of the limit switch, and thus detecting whether the battery compartment door is closed.

[0046] In one embodiment of this application, the vehicle further includes a battery management module. When the battery compartment door is closed, the module detects whether the discharge current or charging current of the power battery is greater than 0. This includes: the battery management module detecting the status information of the power battery; sending the status information to the instrument module; and the instrument module determining whether the discharge current or charging current of the power battery is greater than 0 based on the status information. Specifically, the status information of the power battery includes at least a charging state and a discharging state. If the status information indicates a charging state or a discharging state, the module determines that the discharge current or charging current of the power battery is greater than 0.

[0047] In one embodiment of this application, determining a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment includes: when the temperature inside the battery compartment is less than or equal to a first temperature threshold, determining the predetermined duty cycle to be 0, i.e., the fan does not operate via the PWM wave; when the temperature inside the battery compartment is greater than the first temperature threshold, determining the predetermined duty cycle to be greater than 0, i.e., controlling the fan to operate via the PWM wave. Specifically, those skilled in the art can select an appropriate first temperature threshold according to actual conditions to ensure that the power battery operates in a suitable temperature environment.

[0048] In one embodiment of this application, the first temperature threshold is 27°C. Determining the predetermined duty cycle to be greater than 0 when the temperature inside the battery compartment is greater than the first temperature threshold includes: determining the duty cycle to be between 40% and 60% when the temperature inside the battery compartment is between 28 and 32°C; determining the duty cycle to be between 65% and 75% when the temperature inside the battery compartment is between 33 and 36°C; determining the duty cycle to be between 85% and 95% when the temperature inside the battery compartment is between 37 and 40°C; and determining the duty cycle to be between 96% and 100% when the temperature inside the battery compartment is greater than 41°C. Specifically, when the temperature inside the battery compartment is within any of the above ranges, the duty cycle of the PWM wave is within the corresponding range. The higher the temperature inside the battery compartment, the larger the duty cycle of the PWM wave, thereby controlling the fan speed to be higher, and further improving the heat dissipation efficiency inside the power battery compartment.

[0049] In one embodiment of this application, the operation of the fan is controlled using the aforementioned PWM wave, including: controlling the fan to operate at a first speed (750-850 rpm) when the duty cycle is between 40% and 60%; controlling the fan to operate at a second speed (1700-1900 rpm) when the duty cycle is between 65% and 75%; controlling the fan to operate at a third speed (2800-3100 rpm) when the duty cycle is between 85% and 95%; and controlling the fan to operate at a fourth speed (3300-3500 rpm) when the duty cycle is between 96% and 100%. Specifically, the fan speed falls within any of the aforementioned duty cycles, and the higher the duty cycle of the PWM wave, the higher the fan speed, thereby improving the heat dissipation efficiency within the power battery compartment and ensuring that the power battery operates in a suitable temperature environment.

[0050] In one embodiment of this application, after controlling the operation of the fan using the aforementioned PWM wave, the method further includes: detecting the wind speed inside the battery compartment; and adjusting the opening degree of the louvers in the battery compartment according to the wind speed. Specifically, since the fan generates noise when turned on, adjusting the opening degree of the louvers in the battery compartment according to the fan's wind speed improves the fan noise reduction effect.

[0051] It should be noted that the temperature inside the power battery compartment is detected using a wind speed sensor, and those skilled in the art can select a suitable wind speed sensor based on the actual situation.

[0052] In one embodiment of this application, adjusting the opening degree of the louvers in the battery compartment according to the aforementioned wind speed includes: controlling the opening degree of the louvers to be between 15% and 25% when the wind speed is less than 6.5 m / s; controlling the opening degree of the louvers to be between 40% and 60% when the wind speed is between 6.5 and 14 m / s; controlling the opening degree of the louvers to be between 70% and 90% when the wind speed is between 14 and 20 m / s; and controlling the opening degree of the louvers to be between 75% and 100% when the wind speed is greater than 20 m / s. Specifically, the opening degree of the louvers falls within any of the aforementioned wind speed ranges, and the higher the wind speed, the larger the opening degree of the louvers, thereby improving the fan noise reduction effect.

[0053] In one embodiment of this application, there are multiple fans, including at least a first fan and a second fan. After controlling the first fan to operate using the PWM wave, the method further includes: detecting the temperature change of the battery compartment within a predetermined time; and controlling the second fan to operate using the PWM wave if the temperature inside the battery compartment does not drop by a predetermined value. In this method, controlling the second fan to operate if the temperature inside the battery compartment does not drop by a predetermined value within the predetermined time means that if one fan cannot quickly lower the temperature of the battery compartment, another fan is turned on. For example, if the temperature inside the battery compartment drops below 2°C within 5 minutes after the first fan starts operating, the second fan is controlled to operate.

[0054] More specifically, the second fan is an intake fan, and its rotation speed is the same as that of the first fan, which causes air convection inside the battery compartment, improves the heat exchange effect, and thus improves the heat dissipation efficiency of the battery compartment.

[0055] It should be noted that those skilled in the art can select an appropriate number of fans based on actual conditions to improve the heat dissipation efficiency inside the power battery compartment, so that the power battery can operate in a suitable temperature environment.

[0056] According to embodiments of the present invention, a heat dissipation device for a power battery in a vehicle is also provided. It should be noted that the heat dissipation device for a power battery in a vehicle according to embodiments of the present invention can be used to execute the heat dissipation method for a power battery in a vehicle provided in embodiments of the present invention. The following describes the heat dissipation device for a power battery in a vehicle provided in embodiments of the present invention.

[0057] Figure 2 This is a schematic diagram of a heat dissipation device for a power battery in a vehicle according to an embodiment of the present invention. The power battery is located inside the battery compartment, as shown below. Figure 2 As shown, the heat dissipation device includes:

[0058] The first detection unit 100 is used to detect whether the power battery is in a predetermined working state.

[0059] The second detection unit 200 is used to detect the temperature inside the battery compartment when the power battery is in the predetermined working state.

[0060] The determining unit 300 is used to determine a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment.

[0061] The first control unit 400 is used to control the operation of the fan using the aforementioned PWM wave, and the fan is located inside the aforementioned battery compartment.

[0062] In the aforementioned heat dissipation device, the first detection unit detects whether the power battery is in a predetermined operating state to prevent the fan from starting accidentally. The second detection unit, when the power battery is in the predetermined operating state, detects the temperature inside the power battery compartment. A determining unit then determines a PWM wave with a predetermined duty cycle based on the temperature of the power battery compartment, i.e., adjusts the duty cycle of the PWM wave according to the temperature of the power battery compartment. The first control unit uses the PWM wave to control the fan operation, i.e., controls the fan speed according to the duty cycle of the PWM wave. This heat dissipation device controls the fan operation via PWM waves, avoiding the safety issues caused by the driver manually switching the fan on and off to cool the power battery. Furthermore, by adjusting the duty cycle of the PWM wave according to the temperature of the power battery compartment and then controlling the fan speed accordingly, the heat dissipation efficiency inside the power battery compartment is improved, energy consumption is reduced, thereby improving the battery's charging and discharging performance, increasing the vehicle's driving range, and effectively reducing the risk of vehicle accidents.

[0063] It should be noted that a temperature sensor is used to detect the temperature inside the power battery compartment. The aforementioned fan can be a shaft-driven fan, and those skilled in the art can select appropriate temperature sensors and fans based on actual conditions. Furthermore, a fan safety net is added to the aforementioned fan to prevent accidental injury from the fan blades, further improving safety.

[0064] In one embodiment of this application, the first detection unit includes a first detection module, a second detection module, a third detection module, a fourth detection module, and a first determination module. The first detection module detects whether the vehicle's instrument panel is functioning normally. The second detection module, when the instrument panel is functioning normally, detects whether the vehicle's emergency stop switch is pressed. The third detection module, when the emergency stop switch is not pressed, detects whether the battery compartment door is closed. The fourth detection module, when the battery compartment door is closed, detects whether the discharge current or charging current of the power battery is greater than 0. The first determination module determines that the power battery is in the predetermined operating state when the discharge current or charging current of the power battery is greater than 0. The above method can avoid safety accidents caused by accidental fan start-up during vehicle maintenance. For example, if the battery compartment door is open, accidental fan start-up can easily cause injury from the fan blades. Furthermore, since the power battery temperature will continue to rise when it is charging and discharging, the above method uses the power battery discharge current or the power battery charging current being greater than 0 as one of the necessary conditions for determining that the power battery is in a predetermined working state. This avoids problems such as inaccurate temperature detection values, temperature jumps, and temperature sensor damage that cause abnormal fan operation or frequent start-stop, thereby improving the service life of the fan.

[0065] It should be noted that if the vehicle's instrument panel malfunctions, the instrument panel needs to be inspected to restore its normal operation. When the vehicle's emergency stop switch is pressed, all fans will immediately stop working.

[0066] It should also be noted that the instrument module features a human-machine interface mode, allowing the driver to intuitively view parameters such as the battery compartment temperature and rear compartment fan speed, including audible warnings. The instrument module can also guide the driver in driving safely and cultivate good driving habits within this human-machine interface mode.

[0067] In one embodiment of this application, the third detection module includes a first detection submodule, which is used to detect whether the battery compartment door is closed using a limit switch. Specifically, the limit switch is installed on the battery compartment door, and the collision of the door opening or closing causes the contacts of the limit switch to actuate, thereby connecting or disconnecting the control circuit of the limit switch, thus detecting whether the battery compartment door is closed.

[0068] In one embodiment of this application, the vehicle further includes a battery management module, and the fourth detection module includes a second detection submodule, a sending submodule, and a determining submodule. The second detection submodule is used by the battery management module to detect the status information of the power battery; the sending submodule is used to send the status information to the instrument module; and the determining submodule is used by the instrument module to determine whether the discharge current or charging current of the power battery is greater than 0 based on the status information. Specifically, the status information of the power battery includes at least a charging state and a discharging state. If the status information is a charging state or a discharging state, the discharge current or charging current of the power battery is determined to be greater than 0.

[0069] In one embodiment of this application, the determining unit includes a second determining module and a third determining module. The second determining module is used to determine that the predetermined duty cycle is 0 when the temperature inside the battery compartment is less than or equal to a first temperature threshold, i.e., the fan does not operate via PWM waves. The third determining module is used to determine that the predetermined duty cycle is greater than 0 when the temperature inside the battery compartment is greater than the first temperature threshold, i.e., the fan operates via PWM waves. Specifically, those skilled in the art can select an appropriate first temperature threshold according to actual conditions to ensure that the power battery operates in a suitable temperature environment.

[0070] In one embodiment of this application, the first temperature threshold is 27°C. The third determining module includes a second determining submodule, a third determining submodule, a fourth determining submodule, and a fifth determining submodule. The second determining submodule is used to determine the duty cycle to be between 40% and 60% when the temperature inside the battery compartment is between 28% and 32°C; the third determining submodule is used to determine the duty cycle to be between 65% and 75% when the temperature inside the battery compartment is between 33% and 36°C; the fourth determining submodule is used to determine the duty cycle to be between 85% and 95% when the temperature inside the battery compartment is between 37% and 40°C; and the fifth determining submodule is used to determine the duty cycle to be between 96% and 100% when the temperature inside the battery compartment is greater than 41°C. Specifically, when the temperature inside the battery compartment is within any of the above ranges, the duty cycle of the PWM wave is within the corresponding range. The higher the temperature inside the battery compartment, the larger the duty cycle of the PWM wave, thereby controlling the fan speed to be higher, and further improving the heat dissipation efficiency inside the power battery compartment.

[0071] In one embodiment of this application, the first control unit includes a first control module, a second control module, a third control module, and a fourth control module. The first control module controls the fan to operate at a first speed (between 750 and 850 rpm) when the duty cycle is between 40% and 60%. The second control module controls the fan to operate at a second speed (between 1700 and 1900 rpm) when the duty cycle is between 65% and 75%. The third control module controls the fan to operate at a third speed (between 2800 and 3100 rpm) when the duty cycle is between 85% and 95%. The fourth control module controls the fan to operate at a fourth speed (between 3300 and 3500 rpm) when the duty cycle is between 96% and 100%. Specifically, when the duty cycle of the PWM wave is within any of the above ranges, the fan speed is within the corresponding range. The larger the duty cycle of the PWM wave, the higher the fan speed, thereby improving the heat dissipation efficiency in the power battery compartment and ensuring that the power battery operates in a suitable temperature environment.

[0072] In one embodiment of this application, the device further includes a second control unit, which comprises a fifth detection module and a fifth control module. The fifth detection module is used to detect the wind speed inside the battery compartment after the fan is controlled by the PWM wave. The fifth control module is used to adjust the opening degree of the louvers of the battery compartment according to the wind speed. Specifically, since the fan generates noise when it is turned on, adjusting the opening degree of the louvers of the battery compartment according to the fan speed improves the noise reduction effect of the fan.

[0073] It should be noted that the temperature inside the power battery compartment is detected using a wind speed sensor, and those skilled in the art can select a suitable wind speed sensor based on the actual situation.

[0074] In one embodiment of this application, the fifth control module includes a first control submodule, a second control submodule, a third control submodule, and a fourth control submodule. The first control submodule controls the opening of the louvers to be between 15% and 25% when the wind speed is less than 6.5 m / s; the second control submodule controls the opening of the louvers to be between 40% and 60% when the wind speed is between 6.5 and 14 m / s; the third control submodule controls the opening of the louvers to be between 70% and 90% when the wind speed is between 14 and 20 m / s; and the fourth control submodule controls the opening of the louvers to be between 75% and 100% when the wind speed is greater than 20 m / s. Specifically, the opening of the louvers falls within any of the aforementioned wind speed ranges, and the higher the wind speed, the larger the opening of the louvers, thereby improving the fan noise reduction effect.

[0075] In one embodiment of this application, there are multiple fans, including at least a first fan and a second fan. The device further includes a third control unit, which comprises a sixth detection module and a sixth control module. The sixth detection module is used to detect the temperature change of the battery compartment within a predetermined time after the first fan is controlled to operate using the PWM wave. The sixth control module is used to control the second fan to operate using the PWM wave if the temperature inside the battery compartment does not drop by a predetermined value. In this method, if the temperature inside the battery compartment does not drop by a predetermined value within the predetermined time, the second fan is controlled to operate. That is, if one fan cannot quickly reduce the temperature of the battery compartment, another fan is turned on. For example, if the temperature inside the battery compartment drops below 2°C within 5 minutes after the first fan starts operating, the second fan is controlled to operate.

[0076] More specifically, the second fan is an intake fan, and its rotation speed is the same as that of the first fan, which causes air convection inside the battery compartment, improves the heat exchange effect, and thus improves the heat dissipation efficiency of the battery compartment.

[0077] It should be noted that those skilled in the art can select an appropriate number of fans based on actual conditions to improve the heat dissipation efficiency inside the power battery compartment, so that the power battery can operate in a suitable temperature environment.

[0078] In order to enable those skilled in the art to better understand the technical solution of this application, the technical solution of this application will be described below in conjunction with specific embodiments.

[0079] Example 1

[0080] like Figure 3 As shown, the control circuit corresponding to the heat dissipation method of the power battery in this embodiment includes a power supply 10, a main power switch 20, a temperature sensor 50, a first fan 70, a second fan 80, a fan guard (not shown), a wind speed sensor (not shown), a limit switch 30 (proximity switch), an emergency stop switch (not shown), a louver motor 60, an instrument module 40, and a control harness. The instrument module 40 is started by ACC power-on of the whole vehicle or A+ power-on of the charging gun. The temperature sensor 50, wind speed sensor, limit switch 30, and emergency stop switch are electrically connected to the signal input terminal of the instrument module 40 through the control harness. The emergency stop switch and wind speed sensor are communicatively connected to the signal input terminal of the instrument module 40. The first fan 70, the second fan 80, and the louver motor 60 are communicatively connected to the signal output terminal of the instrument module 40 through the control harness. This control circuit is powered by a 24V power supply. The first fan 70 is an exhaust fan, and the second fan 80 is a ventilation fan.

[0081] like Figure 5 As shown, the operation of the above control circuit is as follows: The main power switch is closed, and it is determined whether the vehicle's ACC or charging gun A+ is valid, i.e., whether the instrument module is working properly. If the instrument module is working properly, it is determined whether the emergency stop switch is pressed. If the emergency stop switch is not pressed, it is determined whether the battery compartment door is closed. If the battery compartment door is closed, it is determined whether the discharge current or charging current of the power battery is greater than 0. If the discharge current or charging current of the power battery is greater than 0, it is determined whether the temperature of the battery compartment is greater than 27°C. If the temperature of the battery compartment is less than or equal to 27°C, all fans are controlled to stop working. If the temperature of the battery compartment is greater than 27°C, the first fan is controlled to start working, and the fan speed is controlled according to the temperature of the battery compartment. If the temperature of the battery compartment drops by less than or equal to 2°C within 5 minutes of the first fan working, the second fan is turned on. In addition, if the fan speed is greater than 6.5 m / s, the louvers are controlled to open, and the opening degree of the louvers is adjusted according to the fan speed.

[0082] Comparative Example 1

[0083] like Figure 4As shown, the working process of the control circuit corresponding to the heat dissipation method of the power battery in the vehicle in this embodiment is as follows: close the main power switch, determine whether the vehicle power-on ACC or charging gun A+ is effective, that is, determine whether the instrument module is working normally. If the instrument module is working normally, determine whether the driver's area switch is open. If the driver's area switch is open, the fan runs at the highest speed. If the driver's area switch is closed, the fan stops running.

[0084] Compared to the heat dissipation method in Comparative Example 1, Embodiment 1 avoids the safety issues caused by the driver controlling the operation of the fan by operating the switch in the driving area to cool the power battery. Furthermore, the method controls the number and speed of the fans based on the temperature of the power battery compartment, thereby improving the heat dissipation efficiency in the power battery compartment, reducing energy consumption, improving the charging and discharging performance of the battery, increasing the vehicle's driving range, and effectively reducing the risk of vehicle accidents.

[0085] The heat dissipation device for the power battery in the aforementioned vehicle includes a processor and a memory. The first detection unit, the second detection unit, the determination unit, and the first control unit are all stored as program units in the memory, and the processor executes the aforementioned program units stored in the memory to achieve the corresponding functions.

[0086] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can avoid the safety risks associated with requiring the driver to manually operate the fan to cool the battery.

[0087] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0088] This invention provides a storage medium storing a program that, when executed by a processor, implements the above-described heat dissipation method.

[0089] This invention provides a processor for running a program, wherein the program executes the heat dissipation method.

[0090] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0091] Step S101: Detect whether the power battery is in the predetermined working state;

[0092] Step S102: When the power battery is in the predetermined working state, the temperature inside the power battery compartment is detected.

[0093] Step S103: Determine a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment.

[0094] Step S104: The fan is controlled to operate using the aforementioned PWM wave, and the fan is located inside the aforementioned battery compartment.

[0095] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0096] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0097] Step S101: Detect whether the power battery is in the predetermined working state;

[0098] Step S102: When the power battery is in the predetermined working state, the temperature inside the power battery compartment is detected.

[0099] Step S103: Determine a PWM wave with a predetermined duty cycle based on the temperature of the battery compartment.

[0100] Step S104: The fan is controlled to operate using the aforementioned PWM wave, and the fan is located inside the aforementioned battery compartment.

[0101] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units described above can be a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0103] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0104] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0105] If the aforementioned integrated units are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0106] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0107] 1) In the heat dissipation method of this application, the first step is to detect whether the power battery is in a predetermined operating state to prevent the fan from starting accidentally. Then, when the power battery is in the predetermined operating state, the temperature inside the power battery compartment is detected. Next, a PWM wave with a predetermined duty cycle is determined based on the temperature of the power battery compartment; that is, the duty cycle of the PWM wave is adjusted according to the temperature of the power battery compartment. Finally, the PWM wave is used to control the fan operation, that is, the fan speed is controlled according to the duty cycle of the PWM wave. This heat dissipation method, by controlling the fan operation with a PWM wave, avoids the safety issues caused by the driver manually operating the fan to cool the power battery. Furthermore, by adjusting the duty cycle of the PWM wave according to the temperature of the power battery compartment and then controlling the fan speed according to the duty cycle of the PWM wave, the fan speed is adjusted according to the temperature of the battery compartment, thereby improving the heat dissipation efficiency inside the power battery compartment and reducing energy consumption. This improves the battery's charging and discharging performance, increases the vehicle's driving range, and effectively reduces the risk of vehicle accidents.

[0108] 2) In the heat dissipation device of this application, the first detection unit detects whether the power battery is in a predetermined working state to prevent the fan from starting accidentally. The second detection unit, when the power battery is in the predetermined working state, detects the temperature inside the power battery compartment. A determining unit determines a PWM wave with a predetermined duty cycle based on the temperature of the power battery compartment, that is, adjusts the duty cycle of the PWM wave according to the temperature of the power battery compartment. The first control unit uses the PWM wave to control the fan operation, that is, controls the fan speed according to the duty cycle of the PWM wave. This heat dissipation device controls the fan operation through PWM waves, avoiding the safety issues caused by the driver manually switching the fan on and off to cool the power battery. Furthermore, the above method adjusts the duty cycle of the PWM wave according to the temperature of the power battery compartment, and then controls the fan speed according to the duty cycle of the PWM wave, that is, adjusts the fan speed according to the temperature of the battery compartment, thereby improving the heat dissipation efficiency inside the power battery compartment and reducing energy consumption, thereby improving the battery's charging and discharging performance, increasing the vehicle's driving range, and effectively reducing the risk of vehicle accidents.

[0109] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method of dissipating heat from a power battery in a vehicle, the power battery being located in a battery compartment, characterized by, The method comprises: detecting whether the power battery is in a predetermined working state; in the case that the power battery is in the predetermined working state, detecting the temperature in the battery compartment; determining a PWM wave with a predetermined duty cycle according to the temperature of the battery compartment; controlling the fan located in the battery compartment to work by using the PWM wave; wherein, detecting whether the power battery is in a predetermined working state comprises: detecting whether the instrument module of the vehicle is working normally, wherein the instrument module provides parameter information for the driver through a human-computer interaction mode; in the case that the instrument module is working normally, detecting whether the emergency stop switch of the vehicle is pressed; in the case that the emergency stop switch is not pressed, detecting whether the hatch of the battery compartment is closed; in the case that the hatch of the battery compartment is closed, detecting whether the discharge current of the power battery or the charging current of the power battery is greater than 0; in the case that the discharge current of the power battery or the charging current of the power battery is greater than 0, determining that the power battery is in the predetermined working state; after controlling the work of the fan by using the PWM wave, the method further comprises: detecting the wind speed in the battery compartment; adjusting the opening degree of the louver of the battery compartment according to the preset corresponding relationship of the wind speed, wherein the preset corresponding relationship is used to describe the corresponding relationship between different wind speeds and different opening degrees of the louver, comprising: in the case that the wind speed is less than 6.5 m / s, controlling the opening degree of the louver to be between 15% and 25%; in the case that the wind speed is between 6.5 m / s and 14 m / s, controlling the opening degree of the louver to be between 40% and 60%; in the case that the wind speed is between 14 m / s and 20 m / s, controlling the opening degree of the louver to be between 70% and 90%; in the case that the wind speed is greater than 20 m / s, controlling the opening degree of the louver to be between 75% and 100%.

2. The method of claim 1, wherein, in the case that the emergency stop switch is not pressed, detecting whether the hatch of the battery compartment is closed, comprising: detecting whether the hatch of the battery compartment is closed by using a travel switch.

3. The method of claim 1, wherein, The vehicle further comprises a battery management module, and in the case that the hatch of the battery compartment is closed, detecting whether the discharge current of the power battery or the charging current of the power battery is greater than 0, comprising: the battery management module detects state information of the power battery; sending the state information to the instrument module; the instrument module determines whether the discharge current of the power battery or the charging current of the power battery is greater than 0 according to the state information.

4. The method of claim 1, wherein, determining a PWM wave with a predetermined duty cycle according to the temperature of the battery compartment, comprising: in the case that the temperature in the battery compartment is less than or equal to a first temperature threshold, determining that the predetermined duty cycle is 0; in the case that the temperature in the battery compartment is greater than the first temperature threshold, determining that the predetermined duty cycle is greater than 0.

5. The method of claim 4, wherein, The first temperature threshold is 27℃, and in the case that the temperature in the battery compartment is greater than the first temperature threshold, determining that the predetermined duty cycle is greater than 0, comprising: when the temperature in the battery compartment is between 28-32℃, the duty cycle is determined to be between 40-60%; when the temperature in the battery compartment is between 33-36℃, the duty cycle is determined to be between 65-75%; when the temperature in the battery compartment is between 37-40℃, the duty cycle is determined to be between 85-95%; when the temperature in the battery compartment is greater than 41℃, the duty cycle is determined to be between 96-100%.

6. The method of claim 5, wherein, The PWM wave is used to control the operation of the fan, including: when the duty cycle is between 40-60%, the fan is controlled to operate at a first speed, which is between 750-850 rpm; when the duty cycle is between 65-75%, the fan is controlled to operate at a second speed, which is between 1700-1900 rpm; when the duty cycle is between 85-95%, the fan is controlled to operate at a third speed, which is between 2800-3100 rpm; when the duty cycle is between 96-100%, the fan is controlled to operate at a fourth speed, which is between 3300-3500 rpm.

7. The method according to any one of claims 1 to 6, characterized in that, The fan has multiple, at least including a first fan and a second fan, after the first fan is controlled to operate by the PWM wave, the method further includes: detecting the temperature change of the battery compartment within a predetermined time; when the temperature in the battery compartment does not decrease by a predetermined value, the second fan is controlled to operate by the PWM wave.

8. A heat dissipation device for a power battery in a vehicle, the power battery being located in a battery compartment, characterized in that, including: a first detection unit for detecting whether the power battery is in a predetermined working state; a second detection unit for detecting the temperature in the battery compartment when the power battery is in the predetermined working state; a determination unit for determining a PWM wave with a predetermined duty cycle according to the temperature of the battery compartment; a first control unit for controlling the operation of the fan by the PWM wave, the fan being located in the battery compartment; The device is also used to detect whether the instrument module of the vehicle is working normally, wherein the instrument module provides parameter information for the driver through a human-computer interaction mode; when the instrument module is working normally, it is detected whether the emergency stop switch of the vehicle is pressed; when the emergency stop switch is not pressed, it is detected whether the hatch of the battery compartment is closed; when the hatch of the battery compartment is closed, it is detected whether the discharge current of the power battery or the charging current of the power battery is greater than 0; when the discharge current of the power battery or the charging current of the power battery is greater than 0, it is determined that the power battery is in the predetermined working state; After the PWM wave is used to control the operation of the fan, the device is further configured to: detect a wind speed in the battery compartment; and adjust an opening degree of a louver of the battery compartment according to a preset corresponding relationship between the wind speed and the opening degree of the louver, wherein the preset corresponding relationship is used to describe a corresponding relationship between different wind speeds and different opening degrees of the louver; and the opening degree of the louver is controlled to be between 15% and 25% when the wind speed is less than 6.5 m / s, to be between 40% and 60% when the wind speed is between 6.5 m / s and 14 m / s, to be between 70% and 90% when the wind speed is between 14 m / s and 20 m / s, and to be between 75% and 100% when the wind speed is greater than 20 m / s.

9. A storage medium, characterized by The storage medium includes a stored program, wherein the program performs the method of any one of claims 1 to 7.

10. A processor, comprising: The processor is configured to run a program, wherein the program performs the method of any one of claims 1 to 7 when run.

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