Liquid leakage monitoring alarm device and battery system

Abstract

The utility model belongs to the technical field of power battery and lithium ion battery systems, and particularly discloses a liquid leakage monitoring alarm device and a battery system.The liquid leakage monitoring alarm device comprises a water tank, a water pump, a liquid cooling plate, detection equipment and a battery management system, and the water tank, the water pump, the detection equipment and the liquid cooling plate are communicated through water conveying pipes and form a liquid cooling loop; a differential pressure sensor is arranged in the detection device and used for collecting the pressure difference of a liquid inlet and a liquid outlet of the liquid cooling plate in real time, a flow meter is used for collecting the flow of a liquid outlet of the liquid cooling plate in real time, a water level gauge is arranged on the top of the water tank and used for collecting the liquid level height in the water tank in real time, and the battery management system can receive the collected information and compare the collected information with a preset corresponding threshold value. Therefore, results of liquid leakage of the liquid cooling plate, liquid leakage of the water tank and liquid leakage of the water pipe between the water pump or the water tank and the liquid cooling plate are obtained. According to the utility model, the real-time accurate monitoring of the liquid leakage condition of the liquid cooling plate is realized, and the function of further checking the liquid leakage point of the battery system is realized.

Description

Technical Field

[0001] This utility model belongs to the technical field of power batteries and lithium-ion battery systems, and specifically relates to a leakage monitoring and alarm device and battery system. Background Technology

[0002] To ensure that the battery cells inside the battery system operate within a suitable temperature range, the battery system is generally cooled using methods such as air cooling, liquid cooling, or phase change material cooling. 。

[0003] Currently, liquid cooling is widely used in battery systems. However, the liquid cooling plates located inside the battery system are prone to leakage. Once leakage occurs, it not only affects the cooling performance of the liquid cooling plate but also reduces the insulation performance of the battery system, posing a significant safety hazard to electrical components. Typically, leakage detection of liquid cooling plates is achieved using float-type liquid level detectors. These detectors detect changes in the liquid level inside the battery system and determine if a leak is occurring. However, float-type liquid level detectors require a delay before responding, resulting in a certain lag and making it difficult to effectively control the risk.

[0004] Patent document CN215262290U discloses a battery system and a battery system leakage detection device. The battery system leakage detection device includes a battery management system, a temperature sensor, and a pressure sensor. The temperature sensor sends the outlet temperature it collects to the battery management system, which then obtains a pre-stored calibration temperature corresponding to the outlet temperature collected by the temperature sensor, and obtains the corresponding calibration pressure at the calibration temperature. The pressure sensor sends the outlet pressure it collects to the battery management system. Specifically, the pressure sensor reports the collected outlet pressure to the battery management system via a CAN bus, and the battery management system compares the received outlet pressure with the obtained calibration pressure. Once an outlet pressure lower than the calibration pressure is detected under the measured outlet temperature conditions, a liquid cooling plate leak can be obtained, resulting in a fast response and rapid detection of liquid cooling system leaks. However, the outlet pressure is affected by multiple factors such as coolant temperature and water pump speed. Especially when encountering water pump leaks or leaks due to loose pipe joints, the outlet pressure detected by the above method will also be lower than the calibration pressure, leading to inaccurate judgment of liquid cooling plate leaks. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a leakage monitoring and alarm device and battery system to more accurately determine whether the liquid cooling plate is leaking.

[0006] To achieve the above objectives, this utility model provides a leakage monitoring and alarm device and a battery system, including a water tank, a water pump, a liquid cooling plate, and a battery management system. The water tank, the water pump, and the liquid cooling plate are sequentially connected through a water supply pipe to form a liquid cooling circuit. The device is characterized by further including a detection device. The detection device has a first liquid inlet, a second liquid inlet, a first liquid outlet, and a second liquid outlet on its exterior. The first liquid inlet is connected to the liquid outlet of the water pump through a water supply pipe, and the second liquid inlet is connected to the liquid inlet of the liquid cooling plate through a water supply pipe. The first liquid outlet... The liquid outlet of the liquid cooling plate is connected to the water inlet via a water supply pipe, and the second liquid outlet is connected to the water return outlet of the water tank via a water supply pipe. The detection device is equipped with a differential pressure sensor. One measuring port of the differential pressure sensor is connected to the first liquid inlet and the second liquid inlet via a water supply pipe, and the other measuring port of the differential pressure sensor is connected to the first liquid outlet and the second liquid outlet via a water supply pipe. The differential pressure sensor is used to collect the pressure difference between the liquid inlet and outlet of the liquid cooling plate. The battery management system is communicatively connected to the differential pressure sensor.

[0007] Preferably, in the above technical solution, the detection device further includes a box and a cover, the box and the cover are detachably connected, the first liquid inlet and the second liquid outlet are located on the front surface of the box, the second liquid inlet and the first liquid outlet are located on the rear surface of the box, and the differential pressure sensor is installed on the rear inner wall of the box.

[0008] Preferably, in the above technical solution, the detection device further includes a flow meter and a microcontroller. The inlet of the flow meter is connected to the first outlet through a water supply pipe, and the outlet of the flow meter is connected to the second outlet through a water supply pipe. The flow meter and the differential pressure sensor are respectively connected to the microcontroller, and the microcontroller is connected to the battery management system.

[0009] Preferably, the above technical solution also includes a water level gauge, which is used to collect the liquid level height in the water tank, and the water level gauge is communicatively connected to the microcontroller.

[0010] Preferably, in the above technical solution, the detection device further includes a gas sensor and a fan. Several ventilation holes are provided on the left and right sides of the box. The gas sensor is located on the left inner wall of the box and close to the ventilation holes. The fan is located above the bottom of the box, and the airflow of the fan is directed towards the gas sensor. The fan is electrically connected to the microcontroller, and the gas sensor is communicatively connected to the microcontroller.

[0011] Preferably, in the above technical solution, the detection equipment further includes an air pump, a check valve, a first electrically controlled valve, and a second electrically controlled valve. The air pump is installed on the front inner wall of the housing. The air outlet of the air pump is connected to the inlet of the check valve. The outlet of the check valve is connected to the first inlet of the first electrically controlled valve. The second inlet of the first electrically controlled valve is connected to the first liquid inlet. The outlet of the first electrically controlled valve is connected to the second liquid inlet. The inlet of the second electrically controlled valve is connected to the first liquid outlet. The outlet of the second electrically controlled valve is connected to the second liquid outlet. The air pump, the first electrically controlled valve, and the second electrically controlled valve are electrically connected to the microcontroller.

[0012] Preferably, in the above technical solution, the detection device further includes a touch display, the detection device is disposed on the upper surface of the cover, and the touch display is electrically connected to the microcontroller.

[0013] Preferably, the above technical solution also includes an alarm, which is communicatively connected to the battery management system.

[0014] Preferably, in the above technical solution, the inner bottom surface of the box is provided with an absorbent cloth, and the upper surface of the cover is provided with a handle.

[0015] A battery system includes a leakage monitoring and alarm device, wherein the leakage monitoring and alarm device is the leakage monitoring and alarm device described above.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] 1. The leakage monitoring and alarm device and battery system of this utility model include a water tank, a water pump, a liquid cooling plate, a battery management system, and a differential pressure sensor. The differential pressure sensor can collect the pressure difference between the inlet and outlet of the liquid cooling plate in real time and report it to the battery management system via the CAN bus. The battery management system compares the received pressure difference between the inlet and outlet with the preset pressure difference threshold. Once the pressure difference between the inlet and outlet of the liquid cooling plate is detected to be greater than the pressure difference threshold, the result of liquid cooling plate leakage can be obtained. Monitoring the pressure difference can reduce the influence of changes in coolant temperature and water pump speed on the result judgment, and realize accurate monitoring of liquid cooling plate leakage.

[0018] 2. This utility model also includes a flow meter and a water level gauge. The flow meter can monitor the liquid outlet flow rate of the liquid cooling plate in real time and report it to the battery management system via a microcontroller. The battery management system compares the received liquid outlet flow rate with a preset flow rate threshold. The water level gauge can monitor the liquid level in the water tank in real time and report it to the battery management system via a microcontroller. The battery management system compares the received liquid level with a preset liquid level threshold. If the pressure difference between the inlet and outlet of the liquid cooling plate does not reach the pressure difference threshold, a leak in the water supply pipe or pump between the water tank and the liquid cooling plate can be detected once the liquid outlet flow rate reaches the threshold. If neither the pressure difference between the inlet and outlet of the liquid cooling plate nor the liquid outlet flow rate reaches the threshold, a leak in the water tank can be detected once the liquid level reaches the liquid level threshold. This enables further investigation of leak points in the battery system.

[0019] 3. This utility model also includes a gas sensor and a fan. The fan can blow air from inside the box towards the gas sensor. When coolant leaks inside the equipment or pipeline, the gas sensor can collect the concentration of alcohol components volatilized from the alcohol coolant. The microcontroller compares the received alcohol component concentration with a preset concentration threshold in the microcontroller. Once the alcohol component concentration exceeds the concentration threshold, the result of internal leakage detection can be obtained, realizing the self-test function of leakage detection equipment.

[0020] 4. This utility model also includes an air pump, a check valve, a first electrically controlled valve, a second electrically controlled valve, and a touch display. When it is necessary to inspect the leakage points of the liquid cooling plate, the first electrically controlled valve is closed by controlling the first liquid inlet through the touch display and the microcontroller, and the air pump is turned on to drain the coolant in the liquid cooling plate. Then, the second electrically controlled valve is closed to check the airtightness of the liquid cooling plate and further confirm the specific location and number of leakage points.

[0021] 5. This utility model also provides a battery system, including a leakage monitoring and alarm device, which is the leakage monitoring and alarm device described in any of the above-mentioned solutions. Since the leakage monitoring and alarm device has the aforementioned technical effects, the battery system having this leakage monitoring and alarm device also has the same technical effects, and will not be elaborated further here. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the leakage monitoring and alarm device and battery system of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the testing equipment of this utility model.

[0024] Figure 3 This is a schematic diagram of the first structure inside the testing equipment of this utility model.

[0025] Figure 4 This is a schematic diagram of the second structure inside the testing equipment of this utility model.

[0026] Figure 5 This is a connection block diagram of the leakage monitoring and alarm device and battery system of this utility model.

[0027] Among them, 1-water tank, 2-water pump, 3-liquid cooling plate, 4-detection equipment, 41-box body, 411-first liquid inlet, 412-second liquid inlet, 413-first liquid outlet, 414-second liquid outlet, 415-ventilation hole, 416-absorbent cloth, 42-cover, 421-handle, 5-differential pressure sensor, 6-microcontroller, 7-water level gauge, 8-flow meter, 91-gas sensor, 92-fan, 10-air pump, 101-first electric control valve, 102-second electric control valve, 103-check valve, 11-touch display, 12-alarm. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] In the description of this utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "thickness", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. Where the terms "first," "second," and "third" are used for descriptive purposes and to distinguish technical features, they should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the sequential relationship of the indicated technical features.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will now be described based on its overall structure.

[0032] like Figure 1 As shown, the leakage monitoring and alarm device in this embodiment includes a water tank 1, a water pump 2, a liquid cooling plate 3, a detection box 4, and a battery management system. The water tank 1, water pump 2, detection box 4, and liquid cooling plate 3 are connected sequentially through a water supply pipe, forming a liquid cooling circuit. Specifically, the return water inlet of the water tank 1 is located at the top of the water tank 1, and the outlet water outlet of the water tank 1 is located at the lower side of the water tank 1, which can prevent excessive air from entering the coolant pipe. The water level gauge 7 is preferably an ultrasonic water level gauge. The detection end of the ultrasonic water level gauge penetrates through the top of the water tank 1 and extends into the interior, enabling non-contact measurement. Moreover, it is simple and convenient to install and maintain, and the liquid level measurement accuracy reaches the millimeter level, making it suitable for long-term continuous measurement.

[0033] Continue to refer to Figure 2 , Figure 3 The detection device 4 includes a rectangular box 41 with an opening at the top and a cover 42. The box 41 and the cover 42 are connected by detachable means such as bolts and buckles. A handle 421 is provided in the middle of the upper surface of the cover 42. A touch display 11 is provided on the left side of the upper surface of the cover 42. A microcontroller is installed on the lower surface of the cover 42. A first liquid inlet 411 and a second liquid outlet 414 are provided on the front surface of the box 41. A second liquid inlet 412 and a first liquid outlet 413 are provided on the rear surface of the box 41. A differential pressure sensor 5 is installed on the inner rear wall of the box 41.

[0034] Specifically, in this embodiment, the first liquid inlet 411 is connected to the liquid outlet of the water pump 2 through a water supply pipe, the second liquid inlet 412 is connected to the liquid inlet of the liquid cooling plate 3 through a water supply pipe, the first liquid outlet 413 is connected to the liquid outlet of the liquid cooling plate 3 through a water supply pipe, the second liquid outlet 414 is connected to the return water outlet of the water tank 1 through a water supply pipe, one measuring port of the differential pressure sensor 5 is connected to the first liquid inlet 411 and the second liquid inlet 412 through a water supply pipe, and the other measuring port of the differential pressure sensor 5 is connected to the first liquid outlet 413 and the second liquid outlet 414 through a water supply pipe. The differential pressure sensor 5 is used to collect the pressure difference between the liquid inlet and outlet of the liquid cooling plate 3.

[0035] Furthermore, in this embodiment, the left and right sides of the box 41 are provided with a plurality of ventilation holes 415 arranged in a circular array to facilitate the convection of air inside and outside the box 41. The bottom inner side of the box 41 is provided with an absorbent cloth 416, which can absorb the liquid that leaks to the bottom of the box 41 and is easy to replace. A gas sensor 91 is provided on the inner left side of the box 41. The ventilation holes 415 on the left side of the box 41 are distributed around the gas sensor 91. A fan 92 is provided in the middle of the bottom inner side of the box 41. The airflow of the fan 92 is directed towards the detection end of the gas sensor 91. The gas sensor 91 is preferably a room temperature alcohol sensor that can detect the concentration of alcohol components volatilized in the alcohol coolant. The gas sensor 91 is used to collect the concentration of alcohol components inside the box 41.

[0036] Continue to refer to Figure 3 , Figure 4 In this embodiment, the flow meter 8 is located inside the housing 41 and above the second liquid outlet 414. The outlet of the flow meter 8 is connected to the second liquid outlet 414 through a water supply pipe. The inlet of the flow meter 8, the second solenoid valve 102, and the first liquid outlet 413 are connected in sequence through a water supply pipe. The flow meter 8 is used to collect the liquid outlet flow of the liquid cooling plate 3. The air pump 10 is installed on the front inner wall of the housing 41. The outlet of the air pump 10 is connected to the inlet of the check valve 103. The outlet of the check valve 103 is connected to the first inlet of the first solenoid valve 101. The second inlet of the first solenoid valve 101 is connected to the first liquid inlet 411. The outlet of the first solenoid valve 101 is connected to the second liquid inlet 412.

[0037] Continue to refer to Figure 5 This embodiment also includes a microcontroller 6 and an alarm 12. The microcontroller 6 is communicatively connected to the differential pressure sensor 5, water level gauge 7, flow meter 8, gas sensor 91, touch display 11, air pump 10, fan 92, first solenoid valve 101, second solenoid valve 102, and battery management system. The alarm 12 is communicatively connected to the battery management system. The microcontroller 6 can report real-time data collected by the differential pressure sensor 5, water level gauge 7, and flow meter 8 to the battery management system. It is worth noting that the touch display 11 in this embodiment can display data collected by the differential pressure sensor 5, flow meter 8, and gas sensor 91, and can also control the operating status of the air pump 10, first solenoid valve 101, and second solenoid valve 102 via touch. The alarm 12 is a three-color audible and visual alarm that can be set to different light color levels.

[0038] It is worth noting that the battery management system can control the on / off state and speed of the water pump 2 according to the battery temperature. A sealed space is formed between the battery module and the liquid cooling plate 3. The coolant in the water tank 1 is pumped to the liquid cooling plate 3 for circulation, which can dissipate heat and cool the battery module. The coolant is mainly composed of water, antifreeze and additives. According to the composition, it can be divided into ethanol type, glycerol type and ethylene glycol type. All of them are coolants that can be used in all weather conditions and have antifreeze function. In this embodiment, the ethanol type coolant is preferred and is used in conjunction with the room temperature alcohol sensor. The battery management system also has the functions of battery system status monitoring, battery system status analysis, battery safety protection, energy control management and battery information management.

[0039] This embodiment also provides a battery system, including a leakage monitoring and alarm device, which is the leakage monitoring and alarm device described in any of the above solutions. Since the leakage monitoring and alarm device has the aforementioned technical effects, the battery system with this leakage monitoring and alarm device also has the same technical effects. The battery system and the leakage monitoring and alarm device can share a single battery management system, which will not be elaborated further here.

[0040] Next, the working principle of the leakage monitoring and alarm device and battery system in this embodiment will be described in detail so that those skilled in the art can better understand this utility model:

[0041] First, under normal operating conditions of the liquid cooling system, the differential pressure sensor continuously collects the pressure difference between the inlet and outlet of the liquid cooling plate for a period of time to determine the range of the pressure difference between the inlet and outlet of the liquid cooling plate under different pump speeds, and sets this parameter as the pressure difference threshold of the battery management system; the flow meter continuously collects the flow rate at the outlet of the liquid cooling plate for a period of time to determine the range of the flow rate at the outlet of the liquid cooling plate under different pump speeds, and sets this parameter as the flow rate threshold of the battery management system; the water level gauge continuously collects the liquid level height in the water tank for a period of time to determine the range of the liquid level height in the water tank under different pump speeds, and sets this parameter as the liquid level height threshold of the battery management system; the concentration threshold of alcohol components collected by the gas sensor is set in the microcontroller.

[0042] Secondly, the battery management system receives real-time data from the differential pressure sensor (inlet and outlet pressure difference), the flow rate from the flow meter (outlet flow rate), and the liquid level from the water level gauge (liquid level). The battery management system can compare the real-time data with the corresponding preset thresholds. The microcontroller receives real-time data from the gas sensor (alcohol concentration), compares the real-time data with the preset concentration thresholds, and reports the comparison results to the battery management system.

[0043] When the real-time pressure difference between the inlet and outlet exceeds the pressure difference threshold, liquid cooling plate leakage can be detected. The battery management system controls the alarm to flash red and sound an intermittent alarm.

[0044] When the real-time pressure difference between the inlet and outlet is less than the pressure difference threshold and the real-time return flow rate is less than the flow rate threshold, the result of water pump leakage or leakage of the water supply pipe between the water tank and the liquid cooling plate can be obtained. The battery management system controls the alarm to flash the yellow light and sound an intermittent alarm.

[0045] When the real-time pressure difference between the inlet and outlet is less than the pressure difference threshold, the real-time return water flow rate is less than the flow rate threshold, and the alcohol concentration is greater than the concentration threshold, the result of leakage detection equipment can be obtained. The battery management system controls the yellow light of the alarm to flash and sounds a continuous alarm.

[0046] When the real-time pressure difference between the inlet and outlet is less than the pressure difference threshold, the real-time return flow rate is greater than the flow rate threshold, the alcohol concentration is less than the concentration threshold, but the real-time liquid level is less than the liquid level height threshold, the result of water tank leakage can be obtained. The battery management system controls the alarm to flash green and sound an intermittent alarm.

[0047] When the real-time pressure difference between the inlet and outlet is less than the pressure difference threshold, the real-time return flow rate is greater than the flow rate threshold, the alcohol concentration is less than the concentration threshold, and the real-time liquid level is greater than the liquid level height threshold, the alarm will not have any lights or alarm sounds.

[0048] In addition, when it is necessary to inspect the leakage points of the liquid cooling plate, the first electronically controlled valve is closed by the touch display and the microcontroller to close the first liquid inlet and control the air pump to start, so that the coolant in the liquid cooling plate can be discharged into the water tank. Then the second electronically controlled valve is closed to check the airtightness of the liquid cooling plate and further confirm the specific location and number of leakage points.

[0049] Therefore, the functions of the leakage monitoring and alarm device and battery system in this embodiment are as follows:

[0050] (1) Liquid cooling plate leakage monitoring function

[0051] By installing differential pressure sensors at the inlet and outlet of the liquid cooling plate, the battery management system can monitor the leakage of the liquid cooling plate in real time.

[0052] (2) Leakage detection function

[0053] By setting up a water level gauge and a flow meter, and using them in conjunction with a differential pressure sensor, the battery management system was able to detect leaks in the liquid cooling plate, water tank, water pump, or the water supply pipe between the water tank and the liquid cooling plate.

[0054] (3) Liquid cooling plate maintenance function

[0055] By controlling the first electronically controlled valve to close the first liquid inlet and the air pump to start, the coolant in the liquid cooling plate can be drained. Then, the second electronically controlled valve is closed to check the airtightness of the liquid cooling plate, which can further confirm the location and quantity of specific leaks.

[0056] (4) Hierarchical alarm function

[0057] By setting up a three-color audible and visual alarm, different levels of alarm escalation can be issued for different leakage problems, realizing a graded alarm function.

[0058] (5) Leakage self-detection function

[0059] By incorporating a gas sensor and a fan, the gas sensor can monitor the concentration of alcohol components inside the chamber in real time, enabling the detection equipment to perform a self-detection function for leaks.

[0060] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. A leakage monitoring and alarm device, comprising a water tank, a water pump, a liquid cooling plate, and a battery management system, wherein the water tank, the water pump, and the liquid cooling plate are sequentially connected via a water supply pipe to form a liquid cooling circuit, characterized in that, It also includes testing equipment, The testing equipment is externally equipped with a first liquid inlet, a second liquid inlet, a first liquid outlet, and a second liquid outlet. The first liquid inlet is connected to the outlet of the water pump via a water supply pipe. The second liquid inlet is connected to the liquid inlet of the liquid cooling plate via a water supply pipe. The first liquid outlet is connected to the outlet of the liquid cooling plate via a water supply pipe. The second liquid outlet is connected to the return water outlet of the water tank via a water supply pipe. The detection device is equipped with a differential pressure sensor. One measuring port of the differential pressure sensor is connected to the first liquid inlet and the second liquid inlet through a water supply pipe. The other measuring port of the differential pressure sensor is connected to the first liquid outlet and the second liquid outlet through a water supply pipe. The differential pressure sensor is used to collect the pressure difference between the liquid inlet and outlet of the liquid cooling plate. The battery management system is communicatively connected to the differential pressure sensor.

2. The leakage monitoring and alarm device according to claim 1, characterized in that, The detection device also includes a box and a cover, the box and the cover are detachably connected, the first liquid inlet and the second liquid outlet are located on the front surface of the box, the second liquid inlet and the first liquid outlet are located on the rear surface of the box, and the differential pressure sensor is installed on the rear inner wall of the box.

3. The leakage monitoring and alarm device according to claim 2, characterized in that, The detection device also includes a flow meter and a microcontroller. The inlet of the flow meter is connected to the first outlet through a water supply pipe, and the outlet of the flow meter is connected to the second outlet through a water supply pipe. The flow meter and the differential pressure sensor are respectively connected to the microcontroller, and the microcontroller is connected to the battery management system.

4. The leakage monitoring and alarm device according to claim 3, characterized in that, It also includes a water level gauge, which is used to collect the liquid level in the water tank, and the water level gauge is communicatively connected to the microcontroller.

5. The leakage monitoring and alarm device according to claim 3, characterized in that, The detection device also includes a gas sensor and a fan. Several ventilation holes are provided on the left and right sides of the box. The gas sensor is located on the left inner wall of the box and close to the ventilation holes. The fan is located above the bottom of the box, and the airflow of the fan is directed towards the gas sensor. The fan is electrically connected to the microcontroller, and the gas sensor is communicatively connected to the microcontroller.

6. The leakage monitoring and alarm device according to claim 3, characterized in that, The testing equipment also includes an air pump, a check valve, a first electrically controlled valve, and a second electrically controlled valve. The air pump is installed on the front inner wall of the housing. The air outlet of the air pump is connected to the inlet of the check valve. The outlet of the check valve is connected to the first inlet of the first electrically controlled valve. The second inlet of the first electrically controlled valve is connected to the first liquid inlet. The outlet of the first electrically controlled valve is connected to the second liquid inlet. The inlet of the second electrically controlled valve is connected to the first liquid outlet. The outlet of the second electrically controlled valve is connected to the second liquid outlet. The air pump, the first electrically controlled valve, and the second electrically controlled valve are electrically connected to the microcontroller.

7. The leakage monitoring and alarm device according to claim 6, characterized in that, The testing device also includes a touch display, which is located on the upper surface of the cover and is electrically connected to the microcontroller.

8. The leakage monitoring and alarm device according to claim 1, characterized in that, It also includes an alarm that is communicatively connected to the battery management system.

9. The leakage monitoring and alarm device according to claim 2, characterized in that, The inner bottom surface of the box is provided with an absorbent cloth, and the upper surface of the cover is provided with a handle.

10. A battery system, characterized in that, It includes a leakage monitoring and alarm device, wherein the leakage monitoring and alarm device is the leakage monitoring and alarm device according to any one of claims 1-9.

Images