A multi-detection access control system for energy storage containers

Abstract

This invention provides a multi-detection access control system for energy storage containers, including a detection device. Each container door is equipped with a mechanical limit switch. When the door is closed, the normally open contact of the corresponding mechanical limit switch is open, and the normally closed contact is closed. When the door is open, the normally open contact of the corresponding mechanical limit switch is closed, and the normally closed contact is open. The normally open contacts of each mechanical limit switch are connected in series and form a circuit with the coil of a first relay and a first battery. The normally closed contacts of each mechanical limit switch are connected in parallel and form a circuit with the coil of a second relay and a second battery. The first and second relays are connected in parallel and are both connected in series between the first and second signal input terminals of the detection device. The detection device determines the door status based on whether there is continuity between the first and second signal input terminals. This invention ensures accurate and reliable reporting of access control signals and reduces the risk of missed detections.

Description

Technical Field

[0001] This invention belongs to the field of energy storage container technology, specifically relating to a multi-detection access control system for energy storage containers. Background Technology

[0002] In recent years, with the continuous adjustment of the energy structure, the installed capacity of new energy power generation, such as wind power and photovoltaic power, which have fluctuating and random power characteristics, has grown rapidly, posing unprecedented challenges to the power and frequency stability of the power grid. Energy storage power stations play an important role in improving the power and frequency stability of the power grid. Among them, containerized electrochemical energy storage power stations have developed particularly rapidly due to their advantages such as flexible site selection, short construction period, and fast peak and frequency regulation response. Energy storage containers are usually used outdoors, and have strict waterproof requirements during operation, requiring high door sealing performance. Once the container door is opened, the battery clusters, power distribution equipment, and various liquid cooling, fire protection, and communication pipelines and lines may be directly exposed, posing risks to personal and equipment safety. Therefore, access control alarms are essential, and energy storage containers have high requirements for the reliability of access control detection systems.

[0003] Energy storage containers are typically equipped with multiple doors. For door access signal detection, the current mainstream design usually employs the following method: Taking a 6-door container as an example, the detection principle diagram is as follows... Figure 1 As shown, each cabinet door is equipped with a limit switch. The normally open (NO) contacts of the limit switches are connected in series, and the signals from both ends are taken as the DI access control signal and sent to the detection device. When all cabinet doors are closed, all normally open contacts of the limit switches are closed, the series detection circuit is closed, and the signal at both ends is conductive. The detection device receives the conduction signal and, according to the set strategy, considers it a normal state. When any cabinet door is opened, the corresponding limit switch contact is opened, the series detection circuit is opened, and the signal at both ends is disconnected. The detection device does not receive the conduction signal and, according to the set strategy, considers it an abnormal state and issues an alarm signal. The series signal at both ends can be sent directly to the detection device or sent to the detection device after being converted by a relay.

[0004] The aforementioned energy storage container access control system uses a normally open node series detection method, which has the following problems: the detection signal is relatively simple and there is only one channel. When the detection circuit has a problem, the access control signal may not be detected, resulting in insufficient overall reliability; the simple limit switch is a mechanical type, which controls the circuit node to be on or off by changing the mechanical position. When the limit switch is stuck or the node is stuck, the node will not move during the opening and closing of the container door, which may lead to access control detection failure. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of the aforementioned background technology and provide a multi-detection system for access control of energy storage containers. By multiplying the detection signals and detection types, this system ensures that access control signals are reported correctly and reliably, thereby reducing the risk of missed detections.

[0006] The technical solution adopted in this invention is: a multi-detection system for access control of energy storage containers, wherein the energy storage container is provided with multiple doors; including a detection device; each door is equipped with a mechanical limit switch; the mechanical limit switch includes a normally open contact and a normally closed contact;

[0007] When the cabinet door is closed, the normally open contact of its corresponding mechanical limit switch is open, and the normally closed contact is closed.

[0008] When the cabinet door is opened, the normally open contact of the corresponding mechanical limit switch is turned on, and the normally closed contact is turned off.

[0009] The normally open contacts of each mechanical limit switch are connected in series with each other, and are connected in series with the coil of the first relay and the first battery to form a circuit;

[0010] The normally closed contacts of each mechanical limit switch are connected in parallel to each other and connected in series with the coil of the second relay and the second battery to form a circuit;

[0011] The first relay and the second relay are connected in parallel, and both are connected in series between the first signal input terminal and the second signal input terminal of the detection device.

[0012] When the coil of the first relay is energized and the coil of the second relay is de-energized, there is no electrical connection between the first signal input terminal and the second signal input terminal.

[0013] When the coil of the first relay is de-energized or the coil of the second relay is energized, there is an electrical connection between the first signal input terminal and the second signal input terminal.

[0014] The detection device determines the status of the cabinet door based on whether there is continuity between the first signal input terminal and the second signal input terminal.

[0015] In the above technical solution, each door is equipped with an infrared ranging device for identifying the door's identity and status, and the output of the infrared ranging device is wirelessly connected to the input of the detection device.

[0016] In the above technical solution, the infrared ranging device includes an infrared transmitter, an infrared receiver, a distance sensor, an A / D conversion module, a data processor, and a signal transmitting device; the infrared ranging device is installed on the inner wall of the container door; the infrared transmitter is used to send infrared rays to the equipment inside the container; the infrared receiver is used to receive the infrared rays reflected by the equipment inside the container, and the output end of the infrared receiver is electrically connected to the input end of the distance sensor; the output end of the distance sensor is electrically connected to the input end of the A / D conversion module; the output end of the A / D conversion module is electrically connected to the input end of the data processor; the output end of the data processor is electrically connected to the input end of the signal transmitting device; and the output end of the signal transmitting device is wirelessly connected to the input end of the detection device.

[0017] In the above technical solution, the first relay is a single-pole double-throw switch, including a first contact and a second contact; when the coil of the first relay is energized, the switch of the first relay is attracted to the first contact; when the coil of the first relay is de-energized, the switch of the first relay is attracted to the second contact; the second contact of the first relay and the switch are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively; the first contact of the first relay is not electrically connected to other devices.

[0018] In the above technical solution, the second relay is a single-pole double-throw switch, including a first contact and a second contact; when the coil of the second relay is energized, the switch of the first relay is attracted to the first contact; when the coil of the second relay is de-energized, the switch of the second relay is attracted to the second contact; the first contact and the switch of the second relay are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively; the second contact of the second relay is not electrically connected to other devices.

[0019] In the above technical solution, the signal transmitting device communicates with the detection device via an RS485 serial port.

[0020] In the above technical solution, the mechanical limit switch includes a switch linkage; the normally open node includes a first node and a second node arranged opposite to each other; the normally closed node includes a third node and a fourth node arranged opposite to each other; when the cabinet door is open, the cabinet door does not contact the switch linkage, and the two ends of the switch linkage contact the first node and the second node respectively, while the two ends of the switch linkage do not contact the third node and the fourth node; when the cabinet door is closed, the cabinet door contacts the switch linkage and pushes the switch linkage to move, so that the two ends of the switch linkage contact the third node and the fourth node respectively, while the two ends of the switch linkage do not contact the first node and the second node.

[0021] In the above technical solution, the internal equipment of the container is a battery compartment or a power distribution box.

[0022] The beneficial effects of this invention are as follows: The hard contact of the limit switch described in this invention is a dual-circuit detection system, which simultaneously has series and parallel node detection. The normally open nodes of each limit switch are connected in series, and the normally closed nodes of each limit switch are connected in parallel. Both signals are simultaneously output to the receiving device via a relay, increasing the reliability of the detection. By using a mechanical detection method, the limit switches are connected in series and in parallel for dual detection. Both signals are simultaneously fed back to the detection device via a relay. When one signal fails, the other can still work normally, solving the problem of a single detection signal.

[0023] This invention employs dual detection using both hard and soft contacts. In addition to mechanical limit switch detection, an infrared rangefinder is installed on the inner wall of the door. A ranging threshold is set based on the internal structure. When either door is opened, the ranging changes; if the distance exceeds the threshold, a signal is sent to the receiving device. Compared to traditional pure mechanical limit switch detection, this method offers higher reliability. The entire detection system uses a hybrid mechanical and infrared detection method, with mechanical detection as the primary method and infrared detection as a secondary method. Under normal circumstances, both operate normally without interference. The receiving device receives both signals, providing dual indication of the access control status. When mechanical detection fails, infrared detection can still detect the access control signal and issue an alarm indicating that the door is open.

[0024] The soft contact detection of the present invention adopts RS485 communication. This communication method can encode the address of each door infrared distance detection device. When the detection device receives the access control signal, it can remotely determine which door is open through the corresponding address. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the existing technology;

[0026] Figure 2 This is a circuit diagram of the present invention;

[0027] Figure 3 This is circuit diagram b of the present invention;

[0028] Figure 4 This is a schematic diagram of the infrared ranging device module of the present invention;

[0029] Figure 5 This is a schematic diagram of the installation of the infrared ranging device of the present invention;

[0030] Figure 6 This is a schematic diagram of the usage process of the infrared ranging device of the present invention;

[0031] Figure 7 This is a partial schematic diagram of the mechanical limit switch of the present invention.

[0032] Among them, 1-first node, 2-second node, 3-third node, 4-fourth node, 5-first contact, 6-second contact, 7-infrared ranging device, 8-box door, 9-container internal equipment, 10-switch linkage, 11-rebound device. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0034] like Figure 2 As shown, the present invention provides a multi-detection access control system for an energy storage container, wherein the energy storage container is equipped with multiple doors; it includes a detection device; each door is equipped with a mechanical limit switch; the mechanical limit switch includes a normally open contact and a normally closed contact;

[0035] When the cabinet door is closed, the normally open contact of its corresponding mechanical limit switch is open, and the normally closed contact is closed.

[0036] When the cabinet door is opened, the normally open contact of the corresponding mechanical limit switch is turned on, and the normally closed contact is turned off.

[0037] The normally open contacts of each mechanical limit switch are connected in series with each other, and are connected in series with the coil of the first relay and the first battery to form a circuit;

[0038] The normally closed contacts of each mechanical limit switch are connected in parallel to each other and connected in series with the coil of the second relay and the second battery to form a circuit;

[0039] The first relay and the second relay are connected in parallel, and both are connected in series between the first signal input terminal and the second signal input terminal of the detection device.

[0040] When the coil of the first relay is energized and the coil of the second relay is de-energized, there is no electrical connection between the first signal input terminal and the second signal input terminal.

[0041] When the coil of the first relay is de-energized or the coil of the second relay is energized, there is an electrical connection between the first signal input terminal and the second signal input terminal.

[0042] The detection device determines the status of the cabinet door based on whether there is continuity between the first signal input terminal and the second signal input terminal.

[0043] The detection device can employ a Battery Management System (BMS). The BMS is equipped with corresponding data processing modules, alarm and display modules to identify input signals and output corresponding alarm signals. All of these modules and their functionalities are existing technologies. If the data processing module of the detection device determines that there is continuity between the first signal input terminal DI1 and the second signal input terminal DI2, it determines that a door is open and outputs an alarm signal to the alarm and display module. The alarm and display module then provides audible or visual alerts, or displays visual or text prompts on the screen to inform maintenance personnel that a door is open.

[0044] Specifically, the first relay is a single-pole double-throw switch, including a first contact 5 and a second contact 6; when the coil of the first relay is energized, the switch of the first relay is attracted to the first contact 5; when the coil of the first relay is de-energized, the switch of the first relay is attracted to the second contact 6; the second contact 6 of the first relay and the switch are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively; the first contact 5 of the first relay is not electrically connected to other devices.

[0045] Since the normally open contacts of each mechanical limit switch are connected in series and form a circuit with the coil of the first relay and the first battery, when any door 8 is open, the normally open contact of the corresponding mechanical limit switch of that door 8 is open. This results in the circuit being open, thus de-energizing the coil of the first relay. When the coil of the first relay is de-energized, the switch of the first relay is attracted to the second contact 6. This causes the first signal input terminal and the second signal input terminal of the detection device to be connected through the switch of the first relay and the second contact 6. After the detection device recognizes that its first signal input terminal and the second signal input terminal are in a connected state, it outputs an alarm signal.

[0046] Specifically, the second relay is a single-pole double-throw switch, including a first contact 5 and a second contact 6; when the coil of the second relay is energized, the switch of the first relay is attracted to the first contact 5; when the coil of the second relay is de-energized, the switch of the second relay is attracted to the second contact 6; the first contact 5 of the second relay and the switch are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively; the second contact 6 of the second relay is not electrically connected to other devices.

[0047] Since the normally closed contacts of each mechanical limit switch are connected in parallel and in series with the coil of the second relay and the second battery to form a circuit, whenever any door 8 is open, the normally closed contact of the corresponding mechanical limit switch of that door 8 is in a conductive state. This causes the second battery, the coil of the second relay, and the normally closed contact to form a circuit, thereby energizing the coil of the second relay. When the coil of the second relay is energized, the switch of the second relay is attracted to the first contact 5, causing the first signal input terminal and the second signal input terminal of the detection device to be connected through the switch of the first relay and the second contact 6. After the detection device recognizes that its first signal input terminal and the second signal input terminal are in a conductive state, it outputs an alarm signal.

[0048] Specifically, the mechanical limit switch includes a switch link 10; the normally open node includes a first node 1 and a second node 2 arranged opposite to each other; the normally closed node includes a third node 3 and a fourth node 4 arranged opposite to each other; when the door 8 is open, the door 8 does not contact the switch link 10, and the two ends of the switch link 10 contact the first node 1 and the second node 2 respectively, while the two ends of the switch link 10 do not contact the third node 3 and the fourth node 4; when the door 8 is closed, the door 8 contacts the switch link 10 and pushes the switch link 10 to move, so that the two ends of the switch link 10 contact the third node 3 and the fourth node 4 respectively, while the two ends of the switch link 10 do not contact the first node 1 and the second node 2.

[0049] like Figure 7 As shown, the switch linkage 10 is also equipped with a spring-loaded device 11, which is a conventional structure for a mechanical limit switch. When the door 8 is closed, the door 8 applies pressure to the switch linkage 10, causing the switch linkage 10 to advance to the third node 3 and the fourth node 4, and to contact the third node 3 and the fourth node 4, thereby connecting the third node 3 and the fourth node 4. When the door 8 is open, the door 8 does not contact the switch linkage 10. Under the action of the spring-loaded device 11, the switch linkage 10 retracts to the first node 1 and the second node 2, and contacts the first node 1 and the second node 2, thereby connecting the first node 1 and the second node 2.

[0050] Preferably, such as Figure 3 As shown, each door 8 is equipped with an infrared ranging device 7 for identifying the identity and status of the door 8. The output of the infrared ranging device 7 is wirelessly connected to the input of the detection device. The first signal input and the second signal input are used to receive the detection signals from the mechanical limit switch, serving as hard contacts of the detection device. The communication interface of the detection device is used to receive the detection signals from the infrared ranging device 7, serving as a soft contact of the detection device. The infrared ranging device 7 installed on each door 8 forms a separate detection branch with the detection device, and respectively feeds back alarm signals to the detection device.

[0051] like Figure 4 As shown, the infrared ranging device 7 includes an infrared transmitter, an infrared receiver, a distance sensor, an A / D conversion module, a data processor, and a signal transmission device; all of the above modules are integrated inside the infrared ranging device 7.

[0052] like Figure 5 As shown, the infrared ranging device 7 is installed on the inner wall of the container door 8; the infrared transmitter is used to send infrared rays to the internal equipment 9 of the container; the internal equipment of the container is a battery compartment or a power distribution box.

[0053] An infrared receiver is used to receive infrared light reflected from the internal equipment 9 of the container. The output of the infrared receiver is electrically connected to the input of the distance sensor; the output of the distance sensor is electrically connected to the input of the A / D conversion module; the output of the A / D conversion module is electrically connected to the input of the data processor; the output of the data processor is electrically connected to the input of the signal transmitting device; and the output of the signal transmitting device is wirelessly connected to the input of the detection device. By placing the infrared transmitter and receiver on the inner wall of the container door 8, changes in the position of the container door 8 can be effectively detected.

[0054] like Figure 6 As shown, the infrared transmitter emits infrared rays, which are reflected by obstacles such as battery boxes or distribution boxes. The infrared receiver receives the infrared signal and sends it to the distance sensor. The distance sensor converts the received infrared signal into an analog electrical signal and sends it to the A / D conversion module. The A / D conversion module converts the analog electrical signal into a digital signal and sends it to the data processor. Through the distance sensor and A / D conversion, the distance between the infrared ranging device 7 and the equipment 9 inside the container can be measured. The data processor analyzes and processes the digital signal, compares it with a set threshold, and if it determines that the threshold is exceeded, it sends an alarm signal to the signal transmitting device. The signal transmitting device then sends the received alarm signal to the detection device.

[0055] The above modules all utilize existing hardware devices from current technologies, without any software program improvements. The data processor is used only for simple numerical comparisons and signal output, and there are no algorithmic improvements.

[0056] Specifically, the signal transmitting device communicates with the detection device via an RS485 serial port. The detection device can assign corresponding address information to the signal transmitting device of each infrared ranging device 7 to identify the identity information of the corresponding cabinet door 8. When the cabinet door 8 is opened, in addition to an alarm signal, the signal transmitting device also simultaneously transmits the specific address of the corresponding cabinet door 8 to the detection device, so that the detection device knows the number of the specific cabinet door 8 that was opened.

[0057] The principles of the present invention will be further explained below with reference to specific embodiments.

[0058] This specific embodiment is configured with two access control input detection signals, such as Figure 2 As shown, one path is a hard contact signal input from a mechanical limit switch, and the other is a soft contact (RS485) signal input from an infrared ranging device, thus achieving dual detection types. The hard contact detection of the limit switch differs from the conventional single-channel normally open contact series detection method. Instead, it consists of two parallel signals output via relays: normally open contacts connected in series and normally closed contacts connected in parallel, achieving dual detection signals for the hard contact.

[0059] like Figure 3 As shown, taking a container with 6 doors as an example, each door is equipped with a mechanical limit switch. Each mechanical limit switch contains a pair of normally open (NO) and normally closed (NC) nodes. Here, normally open and normally closed are defined as the state of the nodes when the door does not touch the mechanical limit switch linkage. That is, when the door is open, the first node 1 and the second node 2 (normally closed nodes) are connected, and the third node 3 and the fourth node 4 (normally open nodes) are disconnected. When the door is closed, the first node 1 and the second node 2 are disconnected, and the third node 3 and the fourth node 4 are connected.

[0060] The normally open contacts (third contact 3, fourth contact 4) of mechanical limit switches 1-6 are connected end-to-end in series and then connected to the first relay KA1. The normally closed contacts (first contact 1, second contact 2) of mechanical limit switches 1-6 are connected in parallel and then connected to the second relay KA2. The first relay KA1 and the second relay KA2 output normally closed and normally open contacts in parallel to provide signals to the dry contacts DI1 and DI2 of the BMS detection device.

[0061] Under normal operating conditions, all container doors are closed. Figure 1 The normally closed contacts (first contact 1, second contact 2) of the limit switch are open, while the normally open contacts (third contact 3, fourth contact 4) are closed. The series circuit of the first relay KA1 coil is closed, the first relay KA1 coil is energized, the first relay is energized, and the switch is disconnected from the second contact 6. The parallel circuit of the second relay KA2 coil is open, the second relay KA2 coil is not energized, the relay is in a reset state, and the switch is disconnected from the second contact 6. The switch and second contact 6 of the first relay KA1, and the switch and first contact 5 of the second relay KA2 connected in parallel to the DI1-DI2 feedback node are open. The detection device does not receive a conduction signal, which is considered a normal state.

[0062] When any door of the container is opened, the series circuit of the first relay KA1 coil becomes open, the coil of the first relay KA1 is de-energized, the relay resets, and the switch and the second contact node 6 become conductive. The parallel circuit of the second relay KA2 coil becomes conductive, the coil of the second relay KA2 is energized, the relay clicks, and the switch and the first contact 5 conduct. The switch of the first relay KA1 and the second contact 6, the switch of the second relay KA2 and the first contact 5 are connected in parallel to the DI1-DI2 feedback node and are in a conductive state. The BMS receives the conduction signal and the access control alarm sounds.

[0063] If there is a problem with the series circuit of the first relay KA1 coil, such as the normally open contact of a limit switch sticking together, the circuit will still be conductive after the door is opened. The switch controlled by the first relay KA1 and the second contact 6 will still be conductive. However, the series circuit of the second relay KA2 coil is normal. The switch controlled by the second relay KA2 and the first contact 5 can still conduct normally. The DI1-DI2 feedback node is conductive. The BMS receives the conduction signal and the access control alarm is triggered.

[0064] Similarly, if a problem occurs in the parallel circuit controlling the coil of relay KA2, the first relay KA1 can still normally issue an access control alarm signal. When both circuits malfunction simultaneously, access control detection will fail. Assuming that after a certain number of years of operation, the probability of a single circuit malfunctioning in the limit switch access control system is 10%, the probability of normal access control detection is 90%. By using a series and parallel dual-circuit detection, the probability of normal access control detection becomes 1 - 10% * 10% = 99%, significantly improving detection reliability.

[0065] Furthermore, in this specific embodiment, an infrared ranging device is also provided on each door. When the door is opened, the infrared ranging device will simultaneously send an alarm signal and the door's identification number to the detection device.

[0066] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. A multi-detection access control system for an energy storage container, wherein the energy storage container is equipped with multiple doors; characterized in that: Includes a detection device; each door is equipped with a mechanical limit switch; the mechanical limit switch includes normally open and normally closed contacts; When the cabinet door is closed, the normally open contact of its corresponding mechanical limit switch is open, and the normally closed contact is closed. When the cabinet door is opened, the normally open contact of the corresponding mechanical limit switch is turned on, and the normally closed contact is turned off. The normally open contacts of each mechanical limit switch are connected in series with each other, and are connected in series with the coil of the first relay and the first battery to form a circuit; The normally closed contacts of each mechanical limit switch are connected in parallel to each other and connected in series with the coil of the second relay and the second battery to form a circuit; The first relay and the second relay are connected in parallel, and both are connected in series between the first signal input terminal and the second signal input terminal of the detection device. When the coil of the first relay is energized and the coil of the second relay is de-energized, there is no electrical connection between the first signal input terminal and the second signal input terminal. When the coil of the first relay is de-energized or the coil of the second relay is energized, there is an electrical connection between the first signal input terminal and the second signal input terminal. The detection device determines the status of the cabinet door based on whether there is continuity between the first signal input terminal and the second signal input terminal.

2. The energy storage container access control multi-detection system according to claim 1, characterized in that: Each door is equipped with an infrared ranging device for identifying the door's identity and status. The output of the infrared ranging device is wirelessly connected to the input of the detection device.

3. The energy storage container access control multi-detection system according to claim 2, characterized in that: The infrared ranging device includes an infrared transmitter, an infrared receiver, a distance sensor, an A / D conversion module, a data processor, and a signal transmitting device. The infrared ranging device is installed on the inner wall of the container door. The infrared transmitter sends infrared rays to the equipment inside the container. The infrared receiver receives the infrared rays reflected by the equipment inside the container; the output of the infrared receiver is electrically connected to the input of the distance sensor. The output of the distance sensor is electrically connected to the input of the A / D conversion module. The output of the A / D conversion module is electrically connected to the input of the data processor. The output of the data processor is electrically connected to the input of the signal transmitting device. The output of the signal transmitting device is wirelessly connected to the input of the detection device.

4. The energy storage container access control multi-detection system according to claim 1, characterized in that: The first relay is a single-pole double-throw switch, including a first contact and a second contact. When the coil of the first relay is energized, the switch of the first relay is attracted to the first contact. When the coil of the first relay is de-energized, the switch of the first relay is attracted to the second contact. The second contact of the first relay and the switch are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively. The first contact of the first relay is not electrically connected to other devices.

5. The energy storage container access control multi-detection system according to claim 1, characterized in that: The second relay is a single-pole double-throw switch, including a first contact and a second contact. When the coil of the second relay is energized, the switch of the first relay is attracted to the first contact. When the coil of the second relay is de-energized, the switch of the second relay is attracted to the second contact. The first contact and the switch of the second relay are electrically connected to the first signal input terminal and the second signal input terminal of the detection device, respectively. The second contact of the second relay is not electrically connected to other devices.

6. The energy storage container access control multi-detection system according to claim 3, characterized in that: The signal transmitting device communicates with the detection device via an RS485 serial port.

7. The energy storage container access control multi-detection system according to claim 1, characterized in that: The mechanical limit switch includes a switch linkage; the normally open node includes a first node and a second node arranged opposite to each other; the normally closed node includes a third node and a fourth node arranged opposite to each other; when the door is open, the door does not contact the switch linkage, and both ends of the switch linkage contact the first node and the second node respectively, while the two ends of the switch linkage do not contact the third node and the fourth node; when the door is closed, the door contacts the switch linkage and pushes the switch linkage to move, so that both ends of the switch linkage contact the third node and the fourth node respectively, while the two ends of the switch linkage do not contact the first node and the second node.

8. The energy storage container access control multi-detection system according to claim 3, characterized in that: The internal equipment of the container is a battery compartment or a power distribution box.

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