Fan control method and system of energy storage equipment

Abstract

The invention provides a fan control method and system for energy storage equipment. The fan control method comprises the steps that temperature data corresponding to a plurality of battery packs in the energy storage equipment are obtained; screening out a battery pack to be cooled from the plurality of battery packs according to the temperature data corresponding to the plurality of battery packs; determining a target air volume distributed to a to-be-cooled battery pack in the input air volumes for cooling the energy storage equipment; and based on the target air volume, the target rotating speed of a target fan corresponding to the to-be-cooled battery pack is calculated, so that the target fan is controlled to rotate according to the target rotating speed.

Description

Technical Field

[0001] This application relates to the technical field of energy storage devices, and particularly to a method and system for controlling a fan of an energy storage device. Background Art

[0002] In the prior art, energy storage battery clusters usually use forced air cooling for heat dissipation. The total air volume provided by the air outlet of the air conditioner is blown into the fans corresponding to each battery pack, and the start and stop of the fans are controlled through digital input and output, or the rotation speeds of the fans corresponding to each battery pack are uniformly adjusted through PWM signals (Pulse-width modulation). However, the temperature conditions of each battery pack are different, and it is impossible to achieve temperature balance control of the battery packs through unified speed regulation of the fans. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide at least a method and system for controlling a fan of an energy storage device. By determining the battery packs to be cooled based on the temperature data corresponding to each battery pack in the energy storage device, the target air volume allocated to the battery packs to be cooled is determined from the air volume blown out by the air outlet of the air conditioner, and then the rotation speed of the fan is determined based on the target air volume, and then the rotation speeds of the fans corresponding to each battery pack are adjusted specifically, solving the technical problem of uneven battery pack temperatures caused by unified adjustment of the fan speeds in the prior art, and achieving the technical effect of controlling the temperature balance of each battery pack.

[0004] This application mainly includes the following aspects:

[0005] In a first aspect, an embodiment of this application provides a method for controlling a fan of an energy storage device. The fan control method includes: obtaining temperature data corresponding to a plurality of battery packs in the energy storage device; screening out the battery packs to be cooled from the plurality of battery packs according to the temperature data corresponding to the plurality of battery packs; determining the target air volume allocated to the battery packs to be cooled from the input air volume for cooling the energy storage device; and calculating the target rotation speed of the target fan corresponding to the battery packs to be cooled based on the target air volume, so as to control the target fan to rotate at the target rotation speed.

[0006] Optionally, the energy storage device includes encapsulating a plurality of battery packs and a plurality of fans, one battery pack corresponding to one fan. An air inlet is provided on the encapsulation housing of the energy storage device, and the air inlet is hermetically connected to the air outlet of the air conditioner, so as to receive the input air volume hermetically provided by the air outlet of the air conditioner through the air inlet.

[0007] Optionally, the temperature data includes a temperature value and a temperature rising rate. The battery pack to be cooled is determined from the multiple battery packs in the following manner: for each battery pack, compare the temperature value of the battery pack with a preset temperature value to obtain a first comparison result, and compare the temperature rising rate of the battery pack with a preset temperature rising rate to obtain a second comparison result; for each battery pack, determine whether the battery pack is the battery pack to be cooled according to the first comparison result and the second comparison result of the battery pack.

[0008] Optionally, the target air volume allocated to the battery pack to be cooled is determined in the following manner: for each battery pack, if the battery pack is the battery pack to be cooled, calculate the first temperature difference between each battery pack and the preset temperature value, and determine the target component corresponding to the first temperature difference in the input air volume according to proportional distribution; for each battery pack, if the battery pack is not the battery pack to be cooled, control the fan corresponding to the battery pack to rotate at a preset minimum speed.

[0009] Optionally, the target air volume allocated to the battery pack to be cooled is determined in the following manner: for each battery pack, if the battery pack is the battery pack to be cooled, calculate the second temperature difference between each battery pack to be cooled and the preset temperature value, and determine the target component corresponding to the second temperature difference in the input air volume according to proportional distribution; for each battery pack, if the battery pack is not the battery pack to be cooled, control the fan corresponding to the battery pack not to rotate.

[0010] Optionally, the target speed is determined according to an air volume calculation formula, and the air volume calculation formula is used to characterize the relationship between the air volume and the speed. Among them, the air volume is equal to the exponential term power of the flow coefficient of the fan, and the exponential term includes a preset coefficient and the product of the outer diameter of the impeller of the fan and the speed.

[0011] Optionally, calculating the target speed of the target fan corresponding to the battery pack to be cooled based on the target air volume includes: based on the air volume calculation formula, calculate the target speed of the target fan through the target air volume corresponding to the battery pack to be cooled.

[0012] Optionally, the target fan is controlled to rotate at the target speed in the following manner: determine the target duty cycle corresponding to the target speed according to a preset mapping relationship between the speed of the target fan and the duty cycle; send a control signal to the target fan, and the duty cycle of the control signal is the target duty cycle, so that the target fan rotates at the target speed.

[0013] Second aspect, an embodiment of the present application further provides a fan control system for an energy storage device. The fan control system includes: an energy storage device, which encapsulates a plurality of battery packs and a plurality of fans, with one battery pack corresponding to one fan, and an air inlet is provided on the encapsulation housing of the energy storage device, wherein the air inlet is hermetically connected to the air outlet of the air conditioner to receive the input air volume through the air inlet; a battery management system for executing the fan control method of the energy storage device described in the first aspect or any possible implementation manner of the first aspect.

[0014] Optionally, the energy storage device further includes an air duct, and the air inlet and each fan are hermetically connected to the air duct to distribute the input air volume to the fans to be cooled.

[0015] Third aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is run by a processor, it executes the steps of the fan control method of the energy storage device described in the first aspect or any possible implementation manner of the first aspect.

[0016] A fan control method and system for an energy storage device provided by an embodiment of the present application, claim 1. By determining the battery packs to be cooled based on the temperature data corresponding to each battery pack in the energy storage device, thereby determining the target air volume allocated to the battery packs to be cooled from the air volume blown out of the air outlet of the air conditioner, and then determining the rotation speed of the fan based on the target air volume, and further adjusting the rotation speed of the fan corresponding to each battery pack specifically, it solves the technical problem of uneven battery pack temperatures caused by uniformly adjusting the speed of the fan in the prior art, and achieves the technical effect of controlling each battery pack to achieve temperature balance.

[0017] To make the above objects, features, and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 Shows a flowchart of a fan control method for an energy storage device provided by an embodiment of the present application.

[0020] Figure 2 Shows a schematic diagram of an energy storage device provided by an embodiment of the present application. Detailed implementation manners

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It should be understood that the accompanying drawings in the present application are only for the purposes of illustration and description, and are not used to limit the protection scope of the present application. In addition, it should be understood that the schematic drawings are not drawn in actual proportions. The flowcharts used in the present application illustrate the operations implemented according to some embodiments of the present application. It should be understood that the operations in the flowchart may not be implemented in sequence, and steps without logical context relationships may be reversed or implemented simultaneously. In addition, those skilled in the art may add one or more other operations to the flowchart or remove one or more operations from the flowchart under the guidance of the content of the present application.

[0022] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but merely represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without creative efforts fall within the protection scope of the present application.

[0023] In the prior art, the air cooling of the energy storage battery cluster includes natural air cooling and forced air cooling. The heat convection heat dissipation coefficient of natural air cooling is small, and the heat exchange efficiency is low. Usually, the forced air cooling method is adopted to cool the battery cluster. The cold air blown out of the air conditioner outlet is connected to the battery cluster, so as to cool the battery packs through the fans corresponding to each battery pack in the battery cluster. Each fan controls the rotation speed through a unified PWM signal. Furthermore, although the temperatures of different battery packs may be different, the rotation speeds of the fans corresponding to each battery pack are the same, resulting in the same air volume allocated to each battery pack and uneven battery pack temperatures.

[0024] Based on this, the embodiments of the present application provide a fan control method and system for an energy storage device. By determining the battery packs to be cooled that need to be cooled based on the temperature data corresponding to each battery pack in the energy storage device, the target air volume allocated to the battery packs to be cooled is determined from the air volume blown out of the air conditioner outlet. Then, the rotation speed of the fan is determined through the target air volume, and further, the rotation speed of the fan corresponding to each battery pack is adjusted specifically, solving the technical problem of uneven battery pack temperatures caused by uniformly adjusting the speed of the fan in the prior art, and achieving the technical effect of controlling the temperature balance of each battery pack. Specifically as follows:

[0025] Please refer toFigure 1 , Figure 1 is a flowchart of a fan control method for an energy storage device provided by an embodiment of the present application. As Figure 1 shown, the fan control method for the energy storage device provided by the embodiment of the present application is applied to a battery management system and includes the following steps:

[0026] S101: Obtain the temperature data corresponding to multiple battery packs in the energy storage device.

[0027] Among them, the energy storage device includes encapsulating multiple battery packs and multiple fans, one battery pack corresponds to one fan, an air inlet is provided on the encapsulation housing of the energy storage device, and the air inlet is hermetically connected to the air outlet of the air conditioner to receive the input air volume provided by the air outlet of the air conditioner through the air inlet.

[0028] That is to say, the number of battery packs in the energy storage device is the same as the number of fans, and one fan corresponds to cooling one battery pack. The air inlet of the energy storage device is used to receive the input air volume blown by the air outlet of the air conditioner.

[0029] S102: According to the temperature data corresponding to multiple battery packs, screen out the battery packs to be cooled among the multiple battery packs.

[0030] The temperature data includes a temperature value and a temperature rise rate. The temperature value includes: the temperature value of the battery pack collected in real time, or, the average temperature value of the battery pack collected within a preset time range. The temperature rise rate includes: calculating the temperature rise rate by the ratio of the temperature change value of the battery pack within a preset calculation period to the preset calculation period.

[0031] Among them, the preset time period and the preset calculation period may be the same or different. The energy storage device also includes a temperature sensor for each battery pack, and the temperature sensor is used to collect the temperature value of the battery pack in real time, so that the battery management system can determine the temperature rise rate through the temperature value of the battery pack collected in real time.

[0032] The battery packs to be cooled are determined among the multiple battery packs in the following manner: for each battery pack, compare the temperature value of the battery pack with a preset temperature value to obtain a first comparison result, and compare the temperature rise rate of the battery pack with a preset temperature rise rate to obtain a second comparison result; for each battery pack, determine whether the battery pack is a battery pack to be cooled according to the first comparison result and the second comparison result of the battery pack.

[0033] The preset temperature value refers to the temperature value inside the encapsulation housing of the energy storage device or the temperature value of the input air volume provided by the air outlet of the air conditioner.

[0034] Specifically, for each battery pack, determine whether the temperature value of the battery pack is greater than a preset temperature value, and determine whether the heating rate of the battery pack is greater than a preset heating rate. When the temperature value of the battery pack is greater than the preset temperature value and the heating rate is greater than the preset heating rate, determine that the battery pack is a battery pack to be cooled.

[0035] S103: Determine a target air volume allocated to the battery pack to be cooled from the input air volume for cooling the energy storage device.

[0036] Determine the target air volume allocated to the battery pack to be cooled in the following manner: for each battery pack, if the battery pack is a battery pack to be cooled, calculate a first temperature difference between each battery pack and the preset temperature value, and determine a target component corresponding to the first temperature difference in the input air volume according to proportional distribution; for each battery pack, if the battery pack is not a battery pack to be cooled, control the fan corresponding to the battery pack to rotate at a preset minimum speed.

[0037] Determine the target component corresponding to the first temperature difference in the input air volume in the following manner: for each battery pack, if the battery pack is a battery pack to be cooled, calculate a first temperature difference between the temperature value of the battery pack and the preset temperature value, divide the temperature difference of the battery pack by the sum of the temperature differences corresponding to each of the multiple battery packs, multiply the ratio by the input air volume, and obtain the target air volume of the battery pack.

[0038] Specifically, calculate the target air volume of the battery pack to be cooled through the following formula:

[0039]

[0040] In formula (1), L i refers to the target air volume of the i-th battery pack to be cooled, ΔT i refers to the temperature difference of the i-th battery pack to be cooled, n refers to the total number of battery packs, and ΔT j refers to the temperature difference of the j-th battery pack, and L all refers to the input air volume.

[0041] Alternatively, determine the target air volume allocated to the battery pack to be cooled in the following manner: for each battery pack, if the battery pack is a battery pack to be cooled, calculate a second temperature difference between each battery pack to be cooled and the preset temperature value, and determine a target component corresponding to the second temperature difference in the input air volume according to proportional distribution; for each battery pack, if the battery pack is not a battery pack to be cooled, control the fan corresponding to the battery pack not to rotate.

[0042] The target component corresponding to the second temperature difference in the input air volume is determined in the following manner, including: for each battery pack, if the battery pack is a battery pack to be cooled, calculate the second temperature difference between the temperature value of the battery pack to be cooled and the preset temperature value, divide the temperature difference of the battery pack to be cooled by the sum of the temperature differences corresponding to the multiple battery packs to be cooled respectively, and multiply the ratio by the input air volume to obtain the target air volume of the battery pack to be cooled.

[0043] Among them, the target air volume of the battery pack to be cooled is calculated by the following formula:

[0044]

[0045] In formula (2), L i refers to the target air volume of the i-th battery pack to be cooled, ΔT i refers to the temperature difference of the i-th battery pack to be cooled, n refers to the total number of battery packs to be cooled in the energy storage device, and L all refers to the input air volume.

[0046] That is to say, in the way of proportional distribution, according to the temperature differences corresponding to each battery pack to be cooled respectively, the target air volume corresponding to each battery pack to be cooled in the input air volume is determined.

[0047] S104: Based on the target air volume, calculate the target rotation speed of the target fan corresponding to the battery pack to be cooled, so as to control the target fan to rotate at the target rotation speed.

[0048] The target rotation speed is determined according to the air volume calculation formula, and the air volume calculation formula is used to characterize the relationship between the air volume and the rotation speed. Among them, the air volume is equal to the exponential term power of the flow coefficient of the fan, and the exponential term includes a preset coefficient and the product of the outer diameter of the impeller of the fan and the rotation speed.

[0049] The air volume calculation formula includes:

[0050]

[0051] In formula (3), L i refers to the target air volume of the i-th battery pack to be cooled, with the unit of m 3 / s (cubic meters per second); Q is the flow coefficient of the target fan of the i-th battery pack to be cooled, which is related to the blade shape of the fan; the exponential term refers to refers to the preset coefficient, D is the outer diameter of the impeller of the target fan of the i-th battery pack to be cooled, and ω i is the rotation speed of the target fan of the i-th battery pack to be cooled, with the unit of RPM (revolutions per minute).

[0052] Calculating the target rotation speed of the target fan corresponding to the battery pack to be cooled based on the target air volume includes: calculating the target rotation speed of the target fan through the target air volume corresponding to the battery pack to be cooled based on the air volume calculation formula.

[0053] That is to say, substituting the target air volume of the target fan into formula (3) to obtain the target rotation speed of the target fan. Furthermore, after determining the target air volume for each battery pack to be cooled, the rotation speed of the fan that generates the target air volume can be determined.

[0054] Derive the rotation speed calculation formula from the air volume calculation formula:

[0055]

[0056] In formula (4), ω i is the rotation speed of the target fan of the i-th battery pack to be cooled, with the unit of RPM (revolutions per minute); L i refers to the target air volume of the i-th battery pack to be cooled, with the unit of m 3 / s (cubic meters per second); Q is the flow coefficient of the target fan of the i-th battery pack to be cooled, which is related to the blade shape of the fan; D is the outer diameter of the impeller of the target fan of the i-th battery pack to be cooled.

[0057] That is to say, substituting the target air volume of the target fan into formula (4) to obtain the target rotation speed of the target fan.

[0058] Control the target fan to rotate at the target rotation speed in the following manner: determine the target duty cycle corresponding to the target rotation speed according to the preset mapping relationship between the rotation speed and the duty cycle of the target fan; send a control signal to the target fan, and the duty cycle of the control signal is the target duty cycle, so that the target fan rotates at the target rotation speed.

[0059] Among them, the relationship between the rotation speed and the duty cycle of the fan is approximately linear. The preset mapping relationship between the rotation speed and the duty cycle of the fan can be directly obtained from the fan manufacturer. Furthermore, the duty cycle corresponding to the rotation speed can be determined through the preset mapping relationship.

[0060] Furthermore, when the fan receives a control signal containing the target duty cycle corresponding to the target rotation speed, it can adjust the rotation speed to the target rotation speed through the target duty cycle, so as to control the fan to rotate at the target rotation speed, and then provide the target air volume to the corresponding battery pack to be cooled.

[0061] The method further includes: for each battery pack, when the battery pack is a battery pack to be cooled, taking the fan corresponding to the battery pack as the target fan, controlling the target fan to start and rotate at a preset minimum speed ω0, and after determining the target air volume corresponding to the target fan, controlling the target fan to rotate at the target speed corresponding to the target air volume.

[0062] Generally, the duty ratio corresponding to the preset minimum speed ω0 of the fan is 0%, and the duty ratio corresponding to the preset maximum speed ω max is 100%.

[0063] Or rather, initially, control each fan to rotate at the preset minimum speed. Thus, the flow rate of each fan is the same. When it is determined that there are battery packs to be cooled among multiple battery packs, allocate the air volume corresponding to each fan proportionally according to the temperature difference between each battery pack and the preset temperature value, and determine the speed corresponding to the fan based on the air volume corresponding to each fan. The larger the air volume of the battery pack, the higher the heat carried away per unit time according to heat convection heat transfer, the greater the heat dissipation, effectively reducing the temperature difference within the cluster and enhancing the consistency of the temperatures of each battery pack.

[0064] Based on the same inventive concept, the embodiment of the present application also provides a fan control system for an energy storage device corresponding to the fan control method for the energy storage device provided in the above embodiment. Since the principle of solving problems by the system in the embodiment of the present application is similar to that of the fan control method for the energy storage device in the above embodiment of the present application, the implementation of the system can refer to the implementation of the method, and the repeated parts will not be elaborated.

[0065] The embodiment of the present application also provides a fan control system for an energy storage device. The fan control system includes: an energy storage device, which includes encapsulating a plurality of battery packs and a plurality of fans. One battery pack corresponds to one fan. An air inlet is provided on the encapsulation housing of the energy storage device, and the air inlet is hermetically connected to the air outlet of the air conditioner to receive the input air volume through the air inlet; a battery management system for executing the fan control method for the energy storage device as described in any one of the above embodiments.

[0066] The energy storage device further includes an air duct, and the air inlet and each fan are hermetically connected to the air duct to distribute the input air volume to the fans to be cooled.

[0067] Please refer to Figure 2 , Figure 2 which shows a schematic diagram of an energy storage device provided in the embodiment of the present application, as Figure 2As shown, the energy storage device 10 includes an air inlet 101, an air duct 102, multiple fans 103 and multiple battery packs 104, wherein the air inlet 101 on the packaging shell of the energy storage device is closed and connected to the air outlet 20 of the air conditioner, and the air duct 102 is used to close the air inlet and the corresponding fan.

[0068] Specifically, the air duct includes a plurality of fan ducts. For each fan duct, the fan duct corresponds to a fan, and the fan duct is used to circulate the air volume distributed to the corresponding fan. Furthermore, adjusting the speed of the fan is equivalent to adjusting the wind resistance of the fan duct corresponding to the fan.

[0069] Based on the same application concept, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the fan control method of the energy storage device provided in the above embodiment are executed.

[0070] Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, etc. When the computer program on the storage medium is run, the fan control method of the energy storage device can be executed. The battery pack to be cooled that needs to be cooled is determined by the temperature data corresponding to each battery pack in the energy storage device, so as to determine the target air volume allocated to the battery pack to be cooled in the air volume blown out of the air outlet of the air conditioner, and then the fan speed is determined by the target air volume, and then the fan speed corresponding to each battery pack is adjusted in a targeted manner, thereby solving the technical problem of uneven battery pack temperature caused by uniformly adjusting the fan speed in the prior art, and achieving the technical effect of controlling each battery pack to achieve temperature balance.

[0071] Those skilled in the art can clearly understand that, for the convenience and simplicity of description, the specific working process of the system and device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. In the several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0072] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0073] In addition, each functional unit in various embodiments of the present application may be integrated into a processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

[0074] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs, etc., which can store program codes.

[0075] The above are only the specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered by the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for controlling a fan of an energy storage device, characterized in that, The fan control method includes: Obtaining temperature data corresponding to multiple battery packs in the energy storage device respectively; Screening out the battery packs to be cooled from the multiple battery packs according to the temperature data corresponding to the multiple battery packs respectively; Determining the target air volume allocated to the battery packs to be cooled in the input air volume for cooling the energy storage device; Based on the target air volume, calculating the target rotation speed of the target fan corresponding to the battery packs to be cooled, so as to control the target fan to rotate at the target rotation speed.

2. The fan control method according to claim 1, wherein The energy storage device includes encapsulating multiple battery packs and multiple fans, with one battery pack corresponding to one fan. Wherein, an air inlet is arranged on the encapsulation shell of the energy storage device, and the air inlet is hermetically connected to the air outlet of the air conditioner, so as to receive the input air volume hermetically provided by the air outlet of the air conditioner through the air inlet.

3. The fan control method according to claim 2, characterized in that The temperature data includes a temperature value and a heating rate, and the battery packs to be cooled are determined from the multiple battery packs in the following manner: For each battery pack, comparing the temperature value of the battery pack with a preset temperature value to obtain a first comparison result, and comparing the heating rate of the battery pack with a preset heating rate to obtain a second comparison result; For each battery pack, determining whether the battery pack is a battery pack to be cooled according to the first comparison result and the second comparison result of the battery pack.

4. The fan control method according to claim 3, wherein The target air volume allocated to the battery packs to be cooled is determined in the following manner: For each battery pack, if the battery pack is a battery pack to be cooled, calculate the first temperature difference between each battery pack and the preset temperature value, and determine the target component corresponding to the first temperature difference in the input air volume according to proportional distribution; For each battery pack, if the battery pack is not a battery pack to be cooled, control the fan corresponding to the battery pack to rotate at a preset minimum rotation speed.

5. The fan control method according to claim 3, characterized in that The target air volume allocated to the battery packs to be cooled is determined in the following manner: For each battery pack, if the battery pack is a battery pack to be cooled, calculate the second temperature difference between each battery pack to be cooled and the preset temperature value, and determine the target component corresponding to the second temperature difference in the input air volume according to proportional distribution; For each battery pack, if the battery pack is not a battery pack to be cooled, control the fan corresponding to the battery pack not to rotate.

6. The fan control method according to claim 1, wherein The target rotation speed is determined according to an air volume calculation formula, and the air volume calculation formula is used to characterize the relationship between the air volume and the rotation speed. Wherein, the air volume is equal to the exponential term power of the flow coefficient of the fan, and the exponential term includes a preset coefficient and the product of the outer diameter of the fan impeller and the rotation speed.

7. The fan control method according to claim 6, wherein The calculating the target rotation speed of the target fan corresponding to the battery packs to be cooled based on the target air volume includes: Based on the air volume calculation formula, calculating the target rotation speed of the target fan through the target air volume corresponding to the battery packs to be cooled.

8. The fan control method according to claim 1, wherein The controlling the target fan to rotate at the target rotation speed is performed in the following manner: Determining the target duty cycle corresponding to the target rotation speed according to a preset mapping relationship between the rotation speed of the target fan and the duty cycle; Send a control signal to the target fan, where the duty cycle of the control signal is the target duty cycle, so that the target fan rotates at the target speed.

9. A fan control system for an energy storage device, characterized in that, The fan control system includes: An energy storage device, which includes encapsulating a plurality of battery packs and a plurality of fans, with one battery pack corresponding to one fan, and an air inlet is provided on the encapsulation housing of the energy storage device, wherein the air inlet is hermetically connected to the air outlet of the air conditioner to receive the input air volume through the air inlet; A battery management system for performing the fan control method of the energy storage device according to any one of claims 1-8.

10. The fan control system according to claim 9, characterized in that, The energy storage device further includes an air duct, and the air inlet and each fan are hermetically connected to the air duct to distribute the input air volume to the fans to be cooled.

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