Fan control system and air cooling energy storage system

Abstract

The utility model provides a fan control system and an air cooling energy storage system.The fan control system comprises a high-voltage box, a fan power source, a battery control module and battery monitoring modules, wherein the fan power source and the battery control module are arranged in the high-voltage box; each battery monitoring module is used for generating a first fan starting signal according to the temperature of the corresponding battery pack, and the fan power supply supplies power to the fan group through the main circuit; each fan is connected to the main circuit through a slave circuit, each slave circuit is further provided with a slave circuit switch module, and for each battery pack, the slave circuit switch module on the corresponding slave circuit is electrically connected with the battery monitoring module; the control module is used for receiving the first fan starting signal and controlling on-off of the slave line switch module according to the first fan starting signal. The fan control system is used for achieving independent cooling of each battery pack, and the safety and performance of the energy storage system are improved.

Description

Technical Field

[0001] This application relates to the technical field of air-cooled energy storage, and particularly to a fan control system and an air-cooled energy storage system. Background Art

[0002] With the increasing global emphasis on the goal of carbon neutrality, the green transformation of the energy field has become particularly crucial. Energy storage technology, as an important part of the energy transformation, has become increasingly prominent. Energy storage batteries, especially lithium batteries, have been widely used in the energy storage field due to their advantages such as high energy density and long cycle life. However, the performance, safety, and life cycle of lithium batteries are deeply affected by the operating temperature, so thermal management has become a key technology in energy storage systems.

[0003] As a method of thermal management for energy storage batteries, in general, an air-cooled energy storage battery pack mainly relies on the cooling fans on the battery pack to conduct heat exchange between hot and cold air. However, due to the current control strategy and its corresponding fan control system, which simply turns on the fan group composed of each fan when the temperature reaches a certain level and turns off the fan group when the temperature drops, and since air-cooled battery packs are generally installed in an air-cooled energy storage cabinet, there are differences in the installation space, and the temperatures in each battery pack are not the same. Adopting the existing fan control system to execute a single fan on / off strategy will result in a large temperature difference between the battery packs in the energy storage cabinet, which will affect the performance of the energy storage cabinet.

[0004] Therefore, there is an urgent need to design a new fan control system and an air-cooled energy storage system to meet the requirements of practical applications. Summary of the Utility Model

[0005] The purpose of this application is to provide a fan control system and an air-cooled energy storage system to solve the problem that the existing fan control system executing a single fan on / off strategy will result in a large temperature difference between the battery packs in the energy storage cabinet, which will affect the performance of the energy storage cabinet.

[0006] The object of the present application is achieved by the following technical solutions: The present application provides a fan control system applied to an air-cooled energy storage system. The air-cooled energy storage system includes a plurality of battery packs and a fan group. The fan group includes fans respectively corresponding to each battery pack. The fan control system includes a high-voltage box, a fan power supply and a battery control module arranged in the high-voltage box, and battery monitoring modules respectively corresponding to each battery pack. Each of the battery monitoring modules is used to generate a first fan start signal according to the temperature of its corresponding battery pack. The fan power supply supplies power to the fan group through a main line. Each of the fans is respectively connected to the main line through a slave line, and a slave line switch module is also arranged on each slave line. For each battery pack, the slave line switch module on its corresponding slave line is electrically connected to the battery monitoring module, and is used to receive the first fan start signal and control the on-off of the slave line switch module according to the first fan start signal.

[0007] The beneficial effects of this technical solution are as follows: Since each battery pack has an independent fan and monitoring unit, precise temperature control of each battery pack can be achieved, avoiding the temperature difference problem caused by unified control. By reducing the temperature difference between battery packs, the performance of the entire energy storage system can be improved, making it more stable and reliable. Through real-time monitoring and control, overheating of each battery pack can be prevented, the risk of thermal runaway can be reduced, and the safety of the entire energy storage system can be improved. Only when the battery pack needs to be cooled, the corresponding fan will start, which can reduce unnecessary energy consumption and improve energy efficiency. In summary, the fan control system provided by the present application can be used to achieve separate cooling of each battery pack, avoiding the problem of large temperature difference between battery packs in the energy storage cabinet and affecting the performance of the energy storage cabinet caused by the fan control system only being able to execute a single fan switch strategy, and improving the safety and performance of the energy storage system.

[0008] In some optional embodiments, the fan power supply includes a multi-output switching power supply. The L terminal and N terminal of the multi-output switching power supply are used to access alternating current, and the multi-output switching power supply further includes multiple groups of DC output ports, and each group of DC output ports is respectively connected to each branch line.

[0009] The beneficial effects of this technical solution are as follows: The design of the multi-output switching power supply provides high flexibility and can supply power to different numbers of fans as needed. The independent DC output ports reduce the mutual interference between fans and improve the power supply reliability. Since the fans only start when needed, it helps to reduce unnecessary energy consumption and achieve reasonable use of energy. In summary, through the design of the multi-output switching power supply, the control and management of fan power supply are realized.

[0010] In some alternative embodiments, a main circuit switch module is provided on the main circuit. The main circuit switch module is electrically connected to the battery control module and is configured to receive the second fan start signal from the battery control module to control the on / off of the main circuit.

[0011] The beneficial effects of this technical solution are as follows: Through the main circuit switch module, centralized control of all fans can be achieved, simplifying the corresponding operations and management. The main circuit switch module can quickly respond to the signals from the battery control module and timely adjust the operating state of the fans to adapt to the temperature changes of the energy storage system.

[0012] In some alternative embodiments, the main circuit switch module includes an intermediate relay. The intermediate relay includes a relay coil and at least one set of normally open contacts. The normally open contacts of the intermediate relay are configured to electrically connect the L terminal of the multi-output switching power supply and the live wire when conducting. The fan control terminal of the battery control module is connected to both ends of the relay coil and is configured to control the conduction of the normally open contacts of the intermediate relay by generating a magnetic field.

[0013] The beneficial effects of this technical solution are as follows: By precisely controlling the energization state of the relay coil through the battery control module and using the relay as a control element, the on / off of the circuit can be safely controlled under high voltage or high current conditions, improving safety. The relay coil has a fast response speed, enabling rapid circuit switching and timely responding to the demand for power-on of the fan main circuit. As a mature electrical component, the relay is easy to maintain and replace, helping to reduce maintenance costs.

[0014] In some alternative embodiments, the main circuit switch module further includes an AC contactor disposed between the L terminal of the switching power supply and the live wire. The AC contactor is electrically connected to the intermediate relay and is configured to connect the L terminal of the multi-output switching power supply and the live wire when the normally open contacts of the intermediate relay are conducting.

[0015] The beneficial effects of this technical solution are as follows: Using the AC contactor can safely connect and disconnect the power supply under high current conditions, reducing operation risks. The AC contactor is designed to quickly switch large currents, ensuring that the fans can start or stop promptly in response to temperature changes. The internal design of the AC contactor helps to reduce the arc generated during the switching process and extend the service life of the contactor.

[0016] In some alternative embodiments, a single-output switching power supply is further included. The L terminal and the N terminal of the single-output switching power supply are used to access alternating current, and the DC output port of the single-output switching power supply is connected to the main control system of the fan control system to provide power supply for the main control system. The beneficial effect of this technical solution is that it provides an independent power supply for the main control system, ensuring that the main control system is not affected by power fluctuations in other parts and can operate stably.

[0017] In some alternative embodiments, the slave line includes an electric wire and a heat shrinkable tube sleeved on the electric wire near one end of the fan. At least one label strip is further provided on the electric wire away from the fan end.

[0018] The beneficial effect of this technical solution is that the heat shrinkable tube provides good insulation performance, preventing the electric wire from short-circuiting or causing electric shock accidents, and at the same time protecting the electric wire from the influence of the external environment (such as moisture, chemical corrosion, etc.), and extending the service life of the electric wire. The presence of the label strip enables maintenance personnel to quickly identify the connection object and function of each electric wire, simplifying the maintenance process. Through the protection of the heat shrinkable tube and the identification of the label strip, the possibility of incorrect wire connection is reduced, improving safety.

[0019] In some alternative embodiments, a connector is further included, and each of the slave lines is respectively connected to the main line through the connector. The beneficial effect of this technical solution is that the connector includes a male head and a female head. By connecting and disconnecting the connector, the power distribution can be controlled to achieve independent control of each fan.

[0020] This application further provides an air-cooled energy storage system, which includes a plurality of battery packs and a fan group, and further includes the fan control system according to any one of the above, and the fan group includes fans respectively corresponding to each battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes this application in conjunction with the drawings and embodiments.

[0022] Figure 1 is a structural block diagram of a fan control system provided by an embodiment of this application;

[0023] Figure 2 is a circuit schematic diagram of a main line switch module and a multi-output switching power supply provided by an embodiment of this application;

[0024] Figure 3 is a structural schematic diagram of a slave line of a fan control system provided by an embodiment of this application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] Next, in combination with the accompanying drawings and specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0026] Referring to Figure 1 , an embodiment of the present application provides a fan control system applied to an air-cooled energy storage system. The air-cooled energy storage system includes a plurality of battery packs and a fan group. The fan group includes fans respectively corresponding to each battery pack. The fan control system includes a high-voltage box, a fan power supply and a battery control module disposed in the high-voltage box, and battery monitoring modules respectively corresponding to each battery pack. Each of the battery monitoring modules is configured to generate a first fan start signal according to the temperature of its corresponding battery pack. The fan power supply supplies power to the fan group through a main line; each of the fans is respectively connected to the main line through a branch line, and a branch line switch module is further provided on each branch line. For each battery pack, the branch line switch module on its corresponding branch line is electrically connected to the battery monitoring module, and is configured to receive the first fan start signal and control the on / off of the branch line switch module according to the first fan start signal.

[0027] The fan control system is applied to an air-cooled energy storage system and consists of a plurality of battery packs (PACK1, PACK2... PACKN, PACKN+1), a fan group, a high-voltage box, a fan power supply, a battery control module (BCU), and a battery monitoring module (BMU). Each battery pack is equipped with a corresponding fan (FAN) to achieve targeted cooling. Each battery pack is equipped with a battery monitoring module responsible for real-time monitoring of the temperature of the battery pack and generating a first fan start signal according to the monitoring result. The fan power supply is set in the high-voltage box and supplies power to all fan groups through the main line. Each fan is connected to the main line through a branch line, and a branch line switch module is provided on the branch line to receive the first fan start signal from the corresponding battery monitoring module. When the battery monitoring module detects that the temperature of the battery pack exceeds a preset threshold, a first fan start signal is generated. The first fan start signal is transmitted to the corresponding branch line switch module, and the branch line switch module controls the on / off of the branch line according to the signal, thereby controlling the start and stop of the corresponding fan.

[0028] The beneficial effects of this embodiment are as follows. Since each battery pack has an independent fan and monitoring unit, precise temperature control of each battery pack can be achieved, avoiding the temperature difference problem caused by unified control. By reducing the temperature difference between battery packs, the performance of the entire energy storage system can be improved, making it more stable and reliable. Through real-time monitoring and control, overheating of each battery pack can be prevented, the risk of thermal runaway can be reduced, and the safety of the entire energy storage system can be improved. Only when the battery pack needs to be cooled will the corresponding fan start, which can reduce unnecessary energy consumption and improve energy efficiency. In summary, the fan control system provided by this application can be used to achieve individual cooling of each battery pack, avoiding the problem of large temperature differences between battery packs in the energy storage cabinet and affecting the performance of the energy storage cabinet caused by the fan control system only being able to execute a single fan on / off strategy, and improving the safety and performance of the energy storage system.

[0029] In summary, the fan control system provided by this application can be used to control the cooling of each battery pack, improving the safety and performance of the energy storage system.

[0030] See Figure 2 , in some embodiments, the fan power supply includes a multi-output switching power supply. The L terminal and N terminal of the multi-output switching power supply are used to connect to alternating current, and the multi-output switching power supply further includes multiple groups of DC output ports (+V / -V), and each group of the DC output ports is respectively connected to each branch line.

[0031] The fan power supply consists of a multi-output switching power supply, which is used to receive alternating current and convert it into multiple groups of direct current outputs. The L terminal (live wire terminal) and N terminal (neutral wire terminal) of the multi-output switching power supply are used as the interface for connecting to an external alternating current power supply as the power input. The switching power supply is internally designed with multiple groups of DC output ports, and each group of ports is used to provide stable direct current. Each DC output port (through ports A1 / B1, A2 / B2, etc.) is respectively connected to different branch lines, and the branch lines are connected to the fans of each battery pack in the energy storage system. It can be considered that each branch line provides an independent power supply for a fan, ensuring that even if one fan has a problem, it will not affect the operation of other fans. In specific applications, through the fan start signal generated by the battery monitoring module, the corresponding branch line switch module is controlled, and then the power on / off of the corresponding fan is controlled. The model of the multi-output switching power supply is, for example, LM350-10B24.

[0032] The beneficial effects of this embodiment are as follows. The design of the multi-output switching power supply provides a high degree of flexibility and can provide power for different numbers of fans as needed. The independent DC output ports reduce the mutual interference between fans and improve the power supply reliability. Since the fans only start when needed, it helps to reduce unnecessary energy consumption and achieve reasonable use of energy.

[0033] In summary, through the design of the multi-output switching power supply, the control and management of the fan power supply are realized.

[0034] In some embodiments, a main circuit switch module is provided on the main circuit. The main circuit switch module is electrically connected to the battery control module and is used to receive the second fan start signal of the battery control module to control the on and off of the main circuit.

[0035] The main circuit switch module is installed on the main circuit. The main circuit switch module is connected to the battery control module through electrical connection, allowing the battery control module to send control signals to the main circuit switch module. It can be considered that the battery control module generates a second fan start signal according to the overall thermal management strategy of the energy storage system. The second fan start signal can be generated based on the temperature monitoring values or current detection values of all battery packs. When the main circuit switch module receives the second fan start signal, it controls the on and off of the power supply of the main circuit. If the second fan start signal indicates that a fan needs to be started, the current is allowed to flow to the fan group; if the fan operation is not required, the power supply is cut off. It can be understood that the control of the main circuit switch module can be global, that is, it affects the start and stop of all fans at the same time.

[0036] The beneficial effect of this embodiment is that through the main circuit switch module, centralized control of all fans can be realized, simplifying the corresponding operations and management. The main circuit switch module can quickly respond to the signals of the battery control module and timely adjust the operating state of the fans to adapt to the temperature changes of the energy storage system.

[0037] See Figure 2 , in some embodiments, the main circuit switch module includes an intermediate relay. The intermediate relay includes a relay coil and at least one set of normally open contacts (contacts 5 and 9); the normally open contacts of the intermediate relay are used to realize the electrical connection between the L terminal of the multi-output switching power supply and the live wire when conducting; the fan control terminals (J1-15, J2-4) of the battery control module are connected to both ends (13 and 14) of the relay coil and are used to control the conduction of the normally open contacts of the intermediate relay by generating a magnetic field.

[0038] The main circuit switch module consists of intermediate relays, and the intermediate relay further includes a relay coil and at least one set of normally open contacts. When the relay coil receives a control signal, it generates a magnetic field through electromagnetic induction. The magnetic field attracts the normally open contacts inside the relay, causing them to change from the normally open state to the closed state. It can be considered that the normally open contacts are open when the relay coil is not activated, and when the relay coil is activated by the fan control terminal of the battery control module, the normally open contacts close, realizing the conduction of the circuit. At the same time, the L terminal (live wire terminal) of the multi-output switching power supply is connected to the live wire of the main circuit through the normally open contacts of the intermediate relay, realizing the access of the power supply. The fan control terminal of the battery control module is responsible for providing a control signal to the relay coil. By controlling the energized state of the relay coil, the closing and opening of the normally open contacts of the intermediate relay can be indirectly controlled. In specific applications, when the battery control module detects that the fan needs to be started, it sends a signal to the relay coil. The relay coil is energized, and the normally open contacts close, thus connecting the circuit between the multi-output switching power supply and the secondary circuit to supply power to the fan. One set of normally open contacts of the intermediate relay can be set between the L terminal of the multi-output switching power supply and the live wire.

[0039] The beneficial effects of this embodiment are as follows: By precisely controlling the energized state of the relay coil through the battery control module and using the relay as a control element, the on-off of the circuit can be safely controlled under high voltage or high current conditions, improving safety. The relay coil has a fast response speed, enabling rapid circuit switching and timely responding to the demand for power supply to the main fan circuit. As a mature electrical component, the relay is easy to maintain and replace, helping to reduce maintenance costs.

[0040] In some embodiments, the main circuit switch module further includes a contactor disposed between the L terminal of the switching power supply and the live wire. The contactor is electrically connected to the intermediate relay to realize the connection between the L terminal of the multi-output switching power supply and the live wire when the normally open contacts of the intermediate relay are conducting.

[0041] In the main circuit switch module, the contactor is disposed between the L terminal of the multi-output switching power supply and the live wire. The normally open contacts of the intermediate relay are electrically connected to the contactor to control the suction and release of the contactor. When the normally open contacts of the intermediate relay receive a control signal from the battery control module and conduct, the contactor is activated. After the contactor is activated, the contacts inside it close, realizing the electrical connection between the L terminal of the multi-output switching power supply and the live wire, thus supplying power to the fan group.

[0042] The beneficial effects of this embodiment are as follows. Using an AC contactor can safely connect and disconnect the power supply under high-current conditions, reducing operation risks. The AC contactor is designed to quickly switch large currents, ensuring that the fan can start or stop quickly in response to temperature changes. The internal design of the AC contactor helps reduce the arc generated during the switching process and extends the service life of the contactor.

[0043] In some embodiments, from the line switch module, it may also include a corresponding intermediate relay, or a structure of a corresponding intermediate relay and an AC contactor. The first fan start signal is received through the intermediate relay to control the on / off of the corresponding slave line.

[0044] In some embodiments, it further includes a single-output switching power supply. The L terminal and N terminal of the single-output switching power supply are used to access alternating current, and the DC output port of the single-output switching power supply is connected to the main control system (J1-16 / J1-8 terminals) of the fan control system to provide power supply for the main control system.

[0045] The single-output switching power supply is used to convert alternating current into direct current, and has input ports for the L terminal (live wire) and N terminal (neutral wire), as well as a set of DC output ports. The L terminal and N terminal of the single-output switching power supply are connected to the AC power supply of the energy storage system to obtain the electric energy required for operation. The DC output port of the single-output switching power supply outputs stable direct current, which can be used to supply power to the main control system of the fan control system. The main control system refers to the part responsible for the operation and monitoring of the entire fan control system, such as a PLC, a single-chip microcomputer, etc., and may include parts such as a battery control module and a battery monitoring module. The beneficial effect of this embodiment is to provide an independent power supply for the main control system, ensuring that the main control system is not affected by the power fluctuations of other parts and can operate stably.

[0046] See Figure 3 , in some embodiments, the slave line includes an electric wire and a heat shrinkable tube sleeved on the electric wire near the fan end, and at least one label strip is also provided on the electric wire far from the fan end.

[0047] The slave line is an electric wire connecting the main line and the fan, responsible for transmitting the power from the main line to each fan. A heat shrinkable tube is sleeved on the electric wire near the fan end to closely fit the electric wire, providing insulation and protection. At least one label strip is provided on the electric wire far from the fan end. The label strip is used to identify information such as the fan number connected to the electric wire. In a specific application, before the electric wire is connected to the fan, the heat shrinkable tube is sleeved on the electric wire and heated to make it shrink, so as to be fixed on the electric wire to provide insulation protection. The label strip ensures that the connection object and function of the electric wire can be quickly identified during connection and maintenance.

[0048] The beneficial effects of this embodiment are as follows. The heat shrinkable sleeve provides good insulation performance, preventing short circuits or electric shock accidents of the wires. At the same time, it protects the wires from the influence of the external environment (such as moisture, chemical corrosion, etc.), extending the service life of the wires. The presence of the label strip enables maintenance personnel to quickly identify the connection objects and functions of each wire, simplifying the maintenance process. Through the protection of the heat shrinkable sleeve and the identification of the label strip, the possibility of incorrect wire connections is reduced, improving safety.

[0049] In some embodiments, a connector is further included, and each of the slave lines is respectively connected to the main line through the connector. It can be considered that the connector includes a male head and a female head. By connecting and disconnecting the connector, the power distribution can be controlled to achieve independent control of each fan.

[0050] The embodiment of the present application also provides an air-cooled energy storage system. The air-cooled energy storage system includes a plurality of battery packs and a fan group. The fan group includes fans respectively corresponding to each battery pack, and also includes the fan control system described in any of the above embodiments. The specific implementation manner of the air-cooled energy storage system is the same as the implementation manner and the achieved technical effects described in the embodiments of the above fan control system, and some contents will not be elaborated.

[0051] In specific applications, for the above air-cooled energy storage system, a separate control strategy can be adopted for the fans in each battery pack. When the temperature in a single battery pack reaches the opening condition, the fan in this battery pack is turned on and the rotational speed of the fan is adjusted according to the temperature difference, so as to dissipate heat in a targeted manner, thereby reducing the temperature difference of the overall energy storage cabinet, and greatly improving the overall performance and safety.

[0052] The terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", etc. (if any) in the specification, claims and drawings of the present application are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "correspond to" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily need to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0053] This application is described from the perspectives of purpose of use, effectiveness, progressiveness, and novelty, and has met the functional enhancement and use requirements emphasized by the Patent Law. The above description and accompanying drawings of this application are only preferred embodiments of this application, and do not limit this application thereby. Therefore, all those that are similar or identical to the structure, device, features, etc. of this application, that is, all equivalent substitutions or modifications made according to the scope of the patent application of this application, shall fall within the scope of protection of the patent application of this application.

Claims

1. A fan control system, applied to an air-cooled energy storage system, the air-cooled energy storage system comprising a plurality of battery packs and a fan group, the fan group comprising a fan respectively arranged corresponding to each battery pack, characterized in that: The fan control system includes a high-voltage box, a fan power supply and a battery control module arranged in the high-voltage box, and a battery monitoring module arranged corresponding to each battery pack. Each battery monitoring module is used to generate a first fan start signal according to the temperature of the corresponding battery pack, and the fan power supply supplies power to the fan group through the main line; each fan is connected to the main line through a slave line, and each slave line is also provided with a slave line switch module. For each battery pack, the slave line switch module on the corresponding slave line is electrically connected to the battery monitoring module, which is used to receive the first fan start signal and control the on and off of the slave line switch module according to the first fan start signal.

2. The fan control system according to claim 1, characterized in that: The fan power supply comprises a multi-channel output switching power supply, the L terminal and the N terminal of the multi-channel output switching power supply are used to access AC power, and the multi-channel output switching power supply also comprises multiple groups of DC output ports, and each group of the DC output ports is respectively connected to each branch line.

3. The fan control system according to claim 2, characterized in that: The main line is provided with a main line switch module, which is electrically connected to the battery control module and is used to receive a second fan start signal from the battery control module to control the on and off of the main line.

4. The fan control system according to claim 3, characterized in that: The main line switch module includes an intermediate relay, which includes a relay coil and at least one group of normally open contacts; the normally open contacts of the intermediate relay are used to achieve electrical connection between the L end of the multi-output switching power supply and the live wire when turned on; the fan control end of the battery control module is connected to the two ends of the relay coil, and is used to control the conduction of the normally open contacts of the intermediate relay by generating a magnetic field.

5. The fan control system according to claim 4, characterized in that: The main line switch module also includes an AC contactor arranged between the L end of the switching power supply and the live wire. The AC contactor is electrically connected to the intermediate relay to achieve the connection between the L end of the multi-output switching power supply and the live wire when the normally open contact of the intermediate relay is turned on.

6. The fan control system according to claim 1, characterized in that: It also includes a single-channel output switching power supply, the L terminal and N terminal of the single-channel output switching power supply are used to connect to AC power, and the DC output port of the single-channel output switching power supply is connected to the main control system of the fan control system to provide power for the main control system.

7. The fan control system according to claim 1, characterized in that: The slave circuit includes an electric wire and a heat shrink tubing sleeved on one end of the electric wire close to the fan, and at least one label strip is also arranged on the end of the electric wire away from the fan.

8. The fan control system according to claim 1, characterized in that: Each of the slave lines is connected to the master line through a connector.

9. An air-cooled energy storage system, characterized in that: The air-cooled energy storage system includes a plurality of battery packs and a fan group, wherein the fan group includes a fan respectively arranged corresponding to each battery pack, and further includes a fan control system according to any one of claims 1-8.

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