Monitoring system of immersed energy storage battery box

Abstract

The utility model discloses a monitoring system of an immersed energy storage battery box, and relates to the technical field of battery management. The system comprises a battery box; the mounting frame is arranged in the battery box, and a hollow flow channel is formed in the side wall of the mounting frame; the battery module is arranged in the mounting frame; through holes are formed in the side wall of the circuit board and the side wall of the battery box, the circuit board is arranged at the through holes, a sealing ring is arranged at the joint of the circuit board and the through holes, an inner plug connector and a built-in sensor are arranged on the face, facing the interior of the battery box, of the circuit board, and an outer plug connector and an outer sensor are arranged on the face, facing the exterior of the battery box, of the circuit board. The first temperature sensor is electrically connected with the inner plug connector, and the inner plug connector is electrically connected with the outer plug connector; the immersed system is connected with the battery box; the refrigerating system is connected with the mounting frame; and the battery management system is electrically connected with the immersed system, the refrigerating system and the outer plug connector. The system can improve the reliability of the battery box.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a monitoring system for an immersion type energy storage battery box. Background Art

[0002] With the growth of global energy demand and the popularity of renewable energy, the development of energy storage technology has become particularly important. As an efficient energy storage solution, the monitoring system of the immersed energy storage battery box works by immersing the battery components in insulating oil to achieve better thermal management and safety performance. However, this design has high requirements for sealing to prevent the overflow of insulating oil and the intrusion of external contaminants. At the same time, since the batteries in the battery box need to be monitored in real time, this design makes the monitoring of the batteries more complicated. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a monitoring system for an immersion energy storage battery box, which can improve the sealing of the battery box and monitor the batteries in the battery box in real time.

[0004] The monitoring system of the submerged energy storage battery box according to the embodiment of the utility model includes:

[0005] Battery box;

[0006] A mounting frame is arranged in the battery box, and a side wall of the mounting frame is provided with a hollow flow channel;

[0007] A battery module is arranged in the mounting frame, the battery module comprises a plurality of batteries connected in series and / or in parallel, each of the batteries is provided with a first temperature sensor;

[0008] A circuit board, a through hole is formed on a side wall of the battery box, the circuit board is arranged at the through hole, and a sealing ring is arranged at the connection between the circuit board and the through hole, an inner plug-in connector and a built-in sensor are arranged on a side of the circuit board facing the inside of the battery box, an outer plug-in connector and an external sensor are arranged on a side of the circuit board facing the outside of the battery box, the first temperature sensor is electrically connected to the inner plug-in connector, and the inner plug-in connector is electrically connected to the outer plug-in connector;

[0009] An immersion system, connected to the battery box, for providing insulating oil to the battery box so that the insulating oil soaks the battery module;

[0010] A refrigeration system connected to the mounting frame and used to introduce refrigeration gas into the hollow flow channel;

[0011] The battery management system is electrically connected to the immersion system, the refrigeration system and the external connector respectively.

[0012] According to some embodiments of the utility model, the immersion system includes an oil storage tank and a circulating pump, a temperature regulating element is provided in the oil storage tank, the insulating oil is stored in the oil storage tank, the liquid outlet of the oil storage tank is connected to one end of the circulating pump, the other end of the circulating pump is connected to the liquid inlet of the battery box, the liquid outlet of the battery box is communicated with the liquid inlet of the oil storage tank, a first solenoid valve is provided between the liquid outlet of the oil storage tank and one end of the circulating pump, and a second solenoid valve is provided between the liquid outlet of the battery box and the liquid inlet of the oil storage tank.

[0013] According to some embodiments of the utility model, the immersion system also includes a spare oil storage tank, in which spare insulating oil is stored, the first solenoid valve and the second solenoid valve are both three-way solenoid valves, the first inlet of the first solenoid valve is connected to the liquid outlet of the oil storage tank, the second inlet of the first solenoid valve is connected to the liquid outlet of the spare oil storage tank, the outlet of the first solenoid valve is connected to one end of the circulation pump, the inlet of the second solenoid valve is connected to the liquid outlet of the battery box, the first outlet of the second solenoid valve is connected to the liquid inlet of the oil storage tank, and the second outlet of the second solenoid valve is connected to the liquid inlet of the spare oil storage tank.

[0014] According to some embodiments of the present invention, a liquid level sensor is provided in the battery box.

[0015] According to some embodiments of the utility model, the circuit board is made of epoxy resin material, and the area of ​​the circuit board is larger than the area of ​​the through hole of the battery box, the sealing ring is welded on the circuit board via a pin header, the sealing ring and the through hole of the battery box have the same geometric center, and the circuit board is fixed to the battery box via screws.

[0016] According to some embodiments of the present invention, the built-in sensor includes a conductivity sensor having a bimetallic strip.

[0017] According to some embodiments of the present invention, the built-in sensor also includes a second temperature sensor, and the second temperature sensor is used to detect the temperature of the insulating oil in the battery box.

[0018] According to some embodiments of the present invention, the external sensor is a capacitive sensor.

[0019] According to some embodiments of the utility model, an isolation chamber is provided at the top of the battery box, the isolation chamber is located above the battery module, a smoke sensor and an openable and closable hatch are provided at the bottom of the isolation chamber, and a flame retardant is provided in the isolation chamber.

[0020] According to some embodiments of the present invention, a one-way pressure relief valve is provided on the top of the battery box.

[0021] The monitoring system for the submerged energy storage battery box according to the embodiment of the utility model has at least the following beneficial effects: the sealing of the battery box is improved by the sealing ring, thereby avoiding oil leakage of the battery box; the conductivity of the insulating oil and the oil leakage state of the battery box can be detected by the external sensor and the internal sensor, thereby improving the stability and reliability of the battery box; the conditions in the battery box are monitored in real time by the internal connector and the external connector, thereby realizing the temperature management of the battery module and avoiding the temperature of the battery module in the battery box being too high.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of a battery box according to an embodiment of the utility model;

[0025] Figure 2 A schematic structural diagram of a battery box from another perspective of an embodiment of the utility model;

[0026] Figure 3 A schematic diagram of a module of a monitoring system for an immersion energy storage battery box according to an embodiment of the utility model;

[0027] Figure 4 It is a schematic structural diagram of the immersion system of an embodiment of the utility model. DETAILED DESCRIPTION

[0028] Embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and are not to be construed as limitations on the present application. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] The terms "first", "second", "third" and "fourth" etc. in the specification and claims of the utility model and the drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

[0031] Reference to "embodiments" in the present invention means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] With the growth of global energy demand and the popularity of renewable energy, the development of energy storage technology has become particularly important. As an efficient energy storage solution, the monitoring system of the immersed energy storage battery box works by immersing the battery components in insulating oil to achieve better thermal management and safety performance. However, this design has high requirements for sealing to prevent the overflow of insulating oil and the intrusion of external contaminants. At the same time, since the batteries in the battery box need to be monitored in real time, this design makes the monitoring of the batteries more complicated.

[0033] To this end, the embodiment of the utility model proposes a monitoring system for an immersion energy storage battery box, which improves the sealing of the battery box through a sealing ring to avoid oil leakage in the battery box; through external sensors and internal sensors, it can detect the conductivity of the insulating oil and the oil leakage state of the battery box, thereby improving the stability and reliability of the battery box; through the circuit board and the battery management system, it can monitor the conditions in the battery box in real time, realize the temperature management of the battery module, and avoid the temperature of the battery module in the battery box being too high.

[0034] On the one hand, the embodiment of the utility model provides a monitoring system for an immersion energy storage battery box, such as Figure 1 and Figure 2 As shown, it includes: a battery box 100, a mounting frame 200, a battery module 300, a circuit board 400, an immersion system 500, a refrigeration system 600 and a battery management system 700; the mounting frame 200 is arranged in the battery box 100, and a hollow flow channel (not shown) is arranged in the side wall of the mounting frame 200, and a battery module 300 is arranged in the mounting frame 200, and the battery module 300 includes a plurality of batteries connected in series and / or in parallel, and each battery is provided with a first temperature sensor, and the side wall of the battery box 100 is provided with a There is a through hole, a circuit board 400 is arranged at the through hole, a sealing ring is arranged at the connection between the circuit board 400 and the through hole, an inner connector 410 and a built-in sensor (not shown) are arranged on the side of the circuit board 400 facing the inside of the battery box 100, and an outer connector 420 and an external sensor (not shown) are arranged on the side of the circuit board 400 facing the outside of the battery box 100, the first temperature sensor is electrically connected to the inner connector 410, the inner connector 410 is electrically connected to the outer connector 420, and the outer connector 420 is electrically connected to the battery management system.

[0035] Specifically, the circuit board 400 is made of epoxy resin material, and its area is larger than the area of ​​the through hole of the battery box 100. The external connectors 420 are arranged in parallel at the through hole. The opening of the circuit board 400 is preferably a rectangular or oblong hole. A sealing ring is placed on the front of the circuit board 400, and the sealing ring is pressed to the edge of the through hole of the battery box 100, and the circuit board 400 is locked by screws. The sealing ring is used to prevent the insulating oil from flowing out from the gap between the circuit board 400 and the through hole of the battery box 100. The sealing ring is placed on the circuit board 400 in an oblong shape, and the pins are welded on the circuit board 400 to limit the displacement of the sealing ring. The sealing ring must be at the same geometric center as the through hole of the battery box 100. The circuit board 400 outside the sealing ring is evenly opened and fixed to the battery box 100 by screws. The internal connector 410 is welded on the back of the circuit board 400, facing the battery in the battery box 100, and connecting the voltage acquisition line and temperature acquisition line of the battery. The external connector 420 is welded on the front side of the circuit board 400 , faces the battery management system 700 outside the battery box 100 , and is plugged into the circuit board of the battery management system 700 .

[0036] The working process of the monitoring system of the submerged energy storage battery box is as follows:

[0037] Insulating oil is introduced into the battery box 100 through the immersion system 500;

[0038] The temperature of each battery is collected by the first temperature sensor to obtain the average temperature of the battery module 300;

[0039] When the average temperature is greater than the first preset temperature, the battery management system 700 controls the immersion system 500 to adjust the temperature of the insulating oil to cool the battery module 300;

[0040] When the average temperature is greater than the second preset temperature, the battery management system 700 controls the immersion system 500 to adjust the temperature of the insulating oil, and controls the refrigeration system 600 to introduce refrigerant gas into the hollow flow channel to cool the battery module 300; the second preset temperature is greater than the first preset temperature;

[0041] The electrical conductivity of the insulating oil is detected by a built-in sensor, and when the electrical conductivity of the insulating oil exceeds a first preset value, the insulating oil is replaced;

[0042] The oil leakage state of the battery box 100 is detected by an external sensor, and an alarm is issued when oil leakage occurs in the battery box 100.

[0043] Specifically, a liquid level sensor is provided inside the battery box 100. When the immersion system introduces insulating oil into the battery box 100, when the liquid level sensor detects that the insulating oil inside the battery box 100 reaches a preset height, the introduction of insulating oil into the battery box 100 is stopped. The insulating oil is used to soak the battery module 300 to cool down the batteries of the battery module 300.

[0044] In this example, if Figure 4 As shown, the immersion system 500 includes an oil storage tank 510 and a circulating pump 520, a temperature regulating element is arranged in the oil storage tank 510, insulating oil is stored in the oil storage tank 510, the liquid outlet of the oil storage tank 510 is connected to one end of the circulating pump 520, the other end of the circulating pump 520 is connected to the liquid inlet of the battery box 100, the liquid outlet of the battery box 100 is communicated with the liquid inlet of the oil storage tank 510, a first solenoid valve 530 is arranged between the liquid outlet of the oil storage tank 510 and one end of the circulating pump 520, and a second solenoid valve 540 is arranged between the liquid outlet of the battery box 100 and the liquid inlet of the oil storage tank 510.

[0045] Before the immersion system 500 introduces insulating oil into the battery box 100, the insulating oil is adjusted to the required temperature through the temperature control element, and then the first solenoid valve 530 is opened, the second solenoid valve 540 is closed, and the circulating pump 520 pumps the insulating oil in the oil storage tank 510 into the battery box 100 until the liquid level sensor detects that the insulating oil inside the battery box 100 reaches a preset height. The first solenoid valve 530 is closed to cool the battery module 300 through the insulating oil in the battery box 100.

[0046] Then, the temperature of the batteries of the battery module 300 is collected. Since the temperature of each battery is not exactly the same, it is necessary to collect the temperature of each battery through a first temperature sensor provided on each battery, and then calculate the average temperature of the entire battery module 300.

[0047] When the average temperature of the battery module 300 in the battery box 100 is slightly higher than the upper limit of the normal range, the battery management system 700 controls the temperature regulating element to reduce the temperature of the insulating oil in the oil storage tank 510. After the temperature of the insulating oil is reduced to a certain extent, the battery management system 700 controls the first solenoid valve 530 and the second solenoid valve 540 to open, so that the circulation pump 520 pumps the insulating oil in the oil storage tank 510 into the battery box 100 to replace the original insulating oil in the battery box 100, and controls the insulating oil in the oil storage tank 510 to circulate between the battery box 100 and the oil storage tank 510, continuously cooling the battery module 300, so that the battery module 300 returns to normal temperature. Among them, the temperature regulating element may include a heating plate, a heating wire and other elements. By adjusting the temperature of the temperature regulating element, the temperature of the insulating oil in the oil storage tank 510 can be adjusted.

[0048] When the average temperature of the battery module 300 is significantly beyond the normal range, the immersion system 500 alone may be inefficient in regulating the temperature of the insulating oil and may not be able to cool the battery module 300 in time. To this end, while the battery management system 700 controls the immersion system 500 to regulate the temperature of the insulating oil and cools the battery module 300 through the insulating oil, it also controls the refrigeration system 600 to pass refrigerant gas into the hollow flow channel to cool the battery module 300. Among them, the mounting frame 200 is composed of a plurality of support plates distributed laterally and a plurality of support plates distributed longitudinally. The mounting frame 200 is used to position and fix the battery module 300, and a hollow flow channel is provided inside the mounting frame 200; the refrigeration system 600 is used to generate refrigerant gas and pass the refrigerant gas into the hollow flow channel, and assists in cooling the battery module 300 through the mounting frame 200, further improving the cooling efficiency, so that the battery of the battery module 300 is cooled as soon as possible to avoid damage to the battery due to excessive temperature.

[0049] Further, in some embodiments of the utility model, the built-in sensor is used to monitor the temperature and conductivity of the insulating oil inside the battery box 100, and the built-in sensor includes a conductivity sensor and a second temperature sensor, and the conductivity sensor has a bimetallic strip. The conductivity sensor is used to determine the conductivity of the insulating oil by measuring the liquid resistance between the bimetallic strips; the second temperature sensor is used to collect the temperature of the insulating oil. By collecting the temperature of the insulating oil through the second temperature sensor, the temperature of the insulating oil in the battery box 100 can be monitored in real time, so that when the average temperature of the battery module 300 does not exceed the first preset value, but the temperature of the insulating oil is high, the first solenoid valve and the second solenoid valve can be opened in time, so that the circulating pump drives the insulating oil in the oil storage tank to circulate in the oil storage tank and the battery box 100, thereby reducing the temperature of the insulating oil in the battery box 100. At the same time, in order to monitor the conductivity of the insulating oil in the battery box 100 in real time, the battery management system applies a DC voltage excitation between the bimetallic strips of the conductivity sensor and obtains the DC current value between the bimetallic strips. In this way, the resistance value between the bimetallic strips can be calculated according to the DC voltage and the DC current, thereby determining the conductivity of the insulating oil. When the resistance value is less than the set threshold, it means that the conductivity of the insulating oil is too high, and the system alarm is triggered to remind the user that the insulating oil needs to be replaced.

[0050] Furthermore, in some embodiments of the utility model, the immersion system also includes a spare oil storage tank, in which spare insulating oil is stored. The first solenoid valve 530 and the second solenoid valve 540 are both three-way solenoid valves. The first inlet of the first solenoid valve 530 is connected to the liquid outlet of the oil storage tank 510, the second inlet of the first solenoid valve 530 is connected to the liquid outlet of the spare oil storage tank, the outlet of the first solenoid valve 530 is connected to one end of the circulating pump 520, the inlet of the second solenoid valve 540 is connected to the liquid outlet of the battery box 100, the first outlet of the second solenoid valve 540 is connected to the liquid inlet of the oil storage tank 510, and the second outlet of the second solenoid valve 540 is connected to the liquid inlet of the spare oil storage tank.

[0051] When it is detected that the conductivity of the insulating oil in the battery box 100 is too high, the insulating oil needs to be replaced. In order to be able to replace the insulating oil in time, a spare oil storage tank is set, and the spare insulating oil is stored in the spare oil storage tank. When the insulating oil needs to be replaced, first open the first outlet of the second solenoid valve 540 so that the circulation pump pumps the insulating oil in the battery box 100 into the oil storage tank, and then close the second solenoid valve 540. Then, the battery management system controls the second inlet of the first solenoid valve 530 to open, and the spare oil storage tank pumps the spare insulating oil into the battery box 100 until the spare insulating oil in the battery box 100 reaches a preset height. Through such a setting, when the conductivity of the insulating oil is too high, the spare insulating oil with normal conductivity can be automatically replaced in time to improve efficiency and avoid damage to the battery module 300.

[0052] Furthermore, in some embodiments of the utility model, the external sensor adopts a capacitive sensor. When the insulating oil leaks and fills the capacitor, the capacitance value changes. Therefore, by monitoring the capacitance value of the external sensor, it can be determined whether the battery box 100 is leaking oil. To this end, an AC voltage excitation is applied to the capacitor of the external sensor, and the AC current value is obtained. According to the AC voltage and the AC current value, the capacitance value of the external sensor can be calculated. When the capacitance value is greater than the preset threshold value, it indicates that the battery box 100 is leaking oil; at this time, an alarm operation needs to be performed so that the operator can check it in time.

[0053] Furthermore, in some embodiments of the present invention, an isolation chamber is provided at the top of the battery box 100, a smoke sensor and an openable and closable hatch are provided at the bottom of the isolation chamber, and a flame retardant is provided in the isolation chamber. When the smoke sensor detects a smoke signal, the battery management system opens the hatch; the flame retardant in the isolation chamber flows into the chamber in the battery box 100 where the battery module 300 is located.

[0054] It should be noted that when the temperature of the batteries in the battery box 100 is too high, thermal runaway may occur, and then spontaneous combustion and other phenomena may occur. In order to avoid this situation, a smoke sensor is installed at the bottom of the isolation chamber (above the battery module 300). When the smoke sensor detects a smoke signal, it indicates that spontaneous combustion may occur. At this time, the hatch of the isolation chamber is opened to allow the flame retardant in the isolation chamber to enter the chamber where the battery module 300 is located in the battery box 100 for flame retardancy.

[0055] Furthermore, in some embodiments of the present invention, a one-way pressure relief valve is provided on the top of the battery box 100 . When the air pressure in the battery box 100 is too high, the pressure relief valve opens to relieve the pressure in the battery box 100 .

[0056] According to the monitoring system of the submerged energy storage battery box of the embodiment of the utility model, it is possible to monitor the conditions in the battery box 100 in real time, realize temperature management of the battery module 300, and avoid the temperature of the battery module 300 in the battery box 100 being too high; at the same time, the sealing performance of the battery box 100 is improved by the sealing ring, and oil leakage of the battery box 100 is avoided; through external sensors and internal sensors, the conductivity of the insulating oil can be detected, and the oil leakage state of the battery box 100 can be detected, thereby improving the stability and reliability of the battery box 100.

[0057] The above is a specific description of the preferred implementation of the utility model, but the utility model is not limited to the above-mentioned implementation mode. Technical personnel familiar with the field can also make various equivalent deformations or substitutions under the shared conditions without violating the spirit of the utility model. These equivalent deformations or substitutions are all included in the scope defined by the claims of the utility model.

Claims

1. A monitoring system for an immersion energy storage battery box, comprising a battery box and a battery module, wherein the battery module comprises a plurality of batteries connected in series and / or in parallel, each of the batteries being provided with a first temperature sensor, characterized in that: The monitoring system further comprises: A mounting frame is disposed in the battery box, a side wall of the mounting frame is provided with a hollow flow channel, and the battery box is disposed in the mounting frame; A circuit board, a through hole is formed on a side wall of the battery box, the circuit board is arranged at the through hole, and a sealing ring is arranged at the connection between the circuit board and the through hole, an inner plug-in connector and a built-in sensor are arranged on a side of the circuit board facing the inside of the battery box, an outer plug-in connector and an external sensor are arranged on a side of the circuit board facing the outside of the battery box, the first temperature sensor is electrically connected to the inner plug-in connector, and the inner plug-in connector is electrically connected to the outer plug-in connector; An immersion system, connected to the battery box, for providing insulating oil to the battery box so that the insulating oil soaks the battery module; A refrigeration system connected to the mounting frame and used to introduce refrigeration gas into the hollow flow channel; The battery management system is electrically connected to the immersion system, the refrigeration system and the external connector respectively.

2. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: The immersion system includes an oil storage tank and a circulation pump, wherein a temperature regulating element is arranged in the oil storage tank, wherein the insulating oil is stored in the oil storage tank, wherein a liquid outlet of the oil storage tank is connected to one end of the circulation pump, wherein the other end of the circulation pump is connected to a liquid inlet of the battery box, wherein the liquid outlet of the battery box is communicated with the liquid inlet of the oil storage tank, wherein a first solenoid valve is arranged between the liquid outlet of the oil storage tank and one end of the circulation pump, and wherein a second solenoid valve is arranged between the liquid outlet of the battery box and the liquid inlet of the oil storage tank.

3. The monitoring system for the submerged energy storage battery box according to claim 2, characterized in that: The immersion system also includes a spare oil storage tank, in which spare insulating oil is stored. The first solenoid valve and the second solenoid valve are both three-way solenoid valves. The first inlet of the first solenoid valve is connected to the liquid outlet of the oil storage tank, the second inlet of the first solenoid valve is connected to the liquid outlet of the spare oil storage tank, the outlet of the first solenoid valve is connected to one end of the circulation pump, the inlet of the second solenoid valve is connected to the liquid outlet of the battery box, the first outlet of the second solenoid valve is connected to the liquid inlet of the oil storage tank, and the second outlet of the second solenoid valve is connected to the liquid inlet of the spare oil storage tank.

4. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: A liquid level sensor is arranged in the battery box.

5. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: The circuit board is made of epoxy resin material, and the area of ​​the circuit board is larger than the area of ​​the through hole of the battery box. The sealing ring is welded on the circuit board through a pin header. The sealing ring and the through hole of the battery box have the same geometric center, and the circuit board is fixed to the battery box by screws.

6. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: The built-in sensor includes a conductivity sensor having a bimetallic strip.

7. The monitoring system for the submerged energy storage battery box according to claim 6, characterized in that: The built-in sensor also includes a second temperature sensor, which is used to detect the temperature of the insulating oil in the battery box.

8. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: The external sensor is a capacitive sensor.

9. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: An isolation chamber is arranged at the top of the battery box, and the isolation chamber is located above the battery module. A smoke sensor and an openable and closable hatch are arranged at the bottom of the isolation chamber, and a flame retardant is arranged in the isolation chamber.

10. The monitoring system for submerged energy storage battery box according to claim 1, characterized in that: A one-way pressure relief valve is arranged on the top of the battery box.

Images