Battery temperature monitoring assembly for liquid-cooled energy storage container

Abstract

The application relates to the technical field of liquid-cooled energy storage, in particular to a battery temperature monitoring assembly of a liquid-cooled energy storage container, which comprises a distributed temperature sensing unit, a wireless data transmission module, a local control module, an elastic mounting mechanism and a power supply module; the distributed temperature sensing unit is attached to the side surface of a battery module by using a flexible sensing substrate, and is matched with a plurality of NTC thermistors to realize comprehensive temperature measurement; the wireless data transmission module transmits data in real time through a LoRa protocol; the local control module realizes local data processing and audible and light alarm; the elastic mounting mechanism realizes convenient installation and stable fixation by means of a magnetic base and an elastic pressing piece; the power supply module adopts dual power supply guarantee of a lithium battery pack and a backup power supply. The application is accurate in monitoring, efficient in installation and maintenance and rapid in response, is suitable for battery modules of different specifications, and can significantly improve the operation safety and stability of the liquid-cooled energy storage system.

Description

Technical Field

[0001] This application relates to the field of liquid-cooled energy storage technology, and in particular to a battery temperature monitoring component for a liquid-cooled energy storage container. Background Technology

[0002] With the rapid development of the new energy industry, energy storage systems, as key equipment for energy consumption and grid peak shaving, are seeing their application scale continuously expand. Liquid-cooled energy storage containers, due to their advantages such as high heat dissipation efficiency, compatibility with high-energy-density batteries, and strong operational stability, have become the mainstream equipment form in large-scale energy storage power stations and industrial and commercial energy storage projects. like Figure 4 , 5 As shown, the core component of a liquid-cooled energy storage container is the several battery modules installed inside the container. These battery modules continuously generate heat during charging and discharging. If the battery module temperature is too high or fluctuates abnormally, it can not only lead to battery performance degradation and shortened lifespan, but may also trigger thermal runaway, causing safety accidents such as fires and explosions, seriously threatening the operational safety of the energy storage system. Therefore, effective temperature monitoring of the battery modules is a crucial step in ensuring the safe operation of liquid-cooled energy storage containers. Existing technologies for temperature monitoring solutions for battery modules in liquid-cooled energy storage containers have the following shortcomings: 1. Some monitoring solutions use single-point temperature sensors, placing the sensor only at a single location on the battery module. This fails to fully cover the critical heat-generating areas of the battery module, easily overlooking the risk of localized overheating. 2. Traditional temperature monitoring components are mostly installed using screw fixing or hard wire connections. Due to the dense arrangement of battery modules inside liquid-cooled energy storage containers, extensive drilling and wiring are required during installation, making the process cumbersome. Subsequent sensor damage or maintenance necessitates the disassembly of numerous components, which is time-consuming and labor-intensive, affecting the normal operation of the energy storage system. 3. The size and installation spacing of battery modules vary within liquid-cooled energy storage containers of different specifications. The fixed installation structure of existing temperature monitoring components makes it difficult to flexibly adapt to different types of battery modules. Furthermore, the components are susceptible to vibration during container transportation or operation, causing the sensors to loosen and further reducing the stability of monitoring. Utility Model Content

[0003] This invention addresses the aforementioned problems in the existing technology by providing a battery temperature monitoring component for a liquid-cooled energy storage container.

[0004] The objective of this utility model is mainly achieved through the following solution: A battery temperature monitoring component for a liquid-cooled energy storage container, wherein the liquid-cooled energy storage container includes a container body, a plurality of battery modules are installed inside the container body, and the battery temperature monitoring component is installed on the battery modules. The monitoring component includes a distributed temperature sensing unit, a wireless data transmission module, a local control module, a flexible installation mechanism, and a power supply module. The distributed temperature sensing unit is used to collect temperature data of the battery module, including a flexible sensing substrate and multiple NTC thermistors arranged on the flexible sensing substrate. The flexible sensing substrate is attached to the side of the battery module. The wireless data transmission module is integrated at the end of the distributed temperature sensing unit and adopts the LoRa wireless communication protocol to transmit the temperature data collected by the NTC thermistor to the local control module in real time. The local control module is installed on the inner wall of the enclosure and includes an MCU chip, a data storage unit and an alarm triggering unit. The MCU chip is used to receive temperature data sent by the wireless data transmission module and compare it with a preset temperature threshold. The data storage unit is used to store temperature data. The alarm triggering unit triggers an audible and visual alarm when the temperature reaches the alarm threshold. The elastic mounting mechanism is used to fix the distributed temperature sensing unit to the surface of the battery module. It includes a magnetic base, an elastic pressure plate and an adjusting bolt. The magnetic base is attached to the metal shell of the battery module. One end of the elastic pressure plate is hinged to the magnetic base and the other end is pressed against the flexible sensing substrate by the adjusting bolt. The power supply module includes a lithium battery pack and a charging interface. The lithium battery pack supplies power to the distributed temperature sensing unit and the wireless data transmission module. The charging interface is connected to the backup power supply of the liquid-cooled energy storage container.

[0005] Preferably, the flexible sensing substrate is made of polyimide with a thickness of 0.1-0.2 mm and a temperature resistance range of -40-125℃. The surface of the flexible sensing substrate is coated with an insulating and thermally conductive coating with a thermal conductivity ≥1.5 W / (m・K).

[0006] Preferably, in the distributed temperature sensing unit, the detection range of each NTC thermistor covers 1-2 battery cells.

[0007] Preferably, the preset temperature threshold includes a normal operating temperature of 0-45℃ and an alarm threshold of ≥45℃.

[0008] Preferably, the magnetic base of the elastic mounting mechanism uses neodymium iron boron permanent magnets with an attraction force ≥50N.

[0009] Preferably, the adjusting bolts of the elastic mounting mechanism are made of plastic.

[0010] Preferably, the elastic pressure plate of the elastic mounting mechanism is made of stainless steel and has a deformation allowance of 0-5mm.

[0011] Preferably, a pad is provided at the position corresponding to the flexible sensing substrate of the elastic pressure plate.

[0012] In summary, compared with the prior art, the present invention has the following beneficial technical effects: (1) In this utility model, the distributed temperature sensing unit adopts a flexible sensing substrate attached to the side of the battery module, and with the insulating thermal conductive coating on the surface, it ensures that the NTC thermistor is in full contact with the surface of the battery module and conducts heat quickly. In addition, each NTC thermistor covers 1-2 battery cells, achieving full coverage of the battery module, avoiding local overheating and missing, and making the temperature detection data more accurate. (2) The flexible installation mechanism in this utility model achieves quick positioning and installation through the magnetic base, without the need for drilling or complex wiring; when disassembling, only the adjusting bolt needs to be loosened to remove the distributed temperature sensing unit. The operation is simple and efficient, greatly shortening the installation and maintenance time and reducing the impact on the operation of the energy storage system. (3) In this utility model, the local control module realizes the local processing of temperature data. The MCU chip compares the temperature data with the preset threshold in real time. When the temperature reaches the alarm threshold, the alarm triggering unit immediately triggers the sound and light alarm. It does not rely on a remote platform, and the response delay time is short, providing sufficient time for staff to intervene in a timely manner. (4) The insulating and thermally conductive coating of the flexible sensing substrate and the plastic adjusting bolts in this utility model are both insulating, which can effectively prevent the risk of short circuit; the power supply module adopts dual power supply of lithium battery pack and backup power supply to avoid monitoring interruption due to power failure, and further ensure the operation safety of energy storage system. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the working principle of this utility model; Figure 2 This is a schematic diagram of the installation of the distributed temperature sensing unit on the battery module in this utility model; Figure 3 This is a three-dimensional structural diagram of the elastic installation mechanism in this utility model; Figure 4 This is another structural schematic diagram of the liquid-cooled energy storage container in this utility model; Figure 5 This is a schematic diagram of the internal structure of the liquid-cooled energy storage container in this utility model; Figure 6 This is a schematic diagram of the battery module in this utility model.

[0014] Reference numerals: 1-box, 2-battery module, 3-elastic mounting mechanism, 4-flexible sensing substrate, 5-NTC thermistor, 6-magnetic base, 7-elastic pressure plate, 8-adjusting bolt, 9-shield, 10-cell battery. Detailed Implementation

[0015] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of this utility model is not limited to the following embodiments, and any modifications and / or alterations made to this utility model will fall within the protection scope of this utility model.

[0016] like Figure 1 As shown, this utility model discloses a technical solution: a battery temperature monitoring component for a liquid-cooled energy storage container. The liquid-cooled energy storage container includes a container body 1, and several sets of battery modules 2 are installed inside the container body 1. The battery temperature monitoring component is installed on the battery modules 2. The monitoring component includes a distributed temperature sensing unit, a wireless data transmission module, a local control module, a flexible installation mechanism 3, and a power supply module.

[0017] Specifically, the distributed temperature sensing unit is used to collect temperature data of the battery module 2, including a flexible sensing substrate 4 and multiple NTC thermistors 5 arranged on the flexible sensing substrate 4. The flexible sensing substrate 4 is attached to the side of the battery module 2. Through the flexibility of the flexible sensing substrate 4, it can be closely attached to the curved or flat surface of the side of the battery module 2, ensuring that the NTC thermistors 5 are in full contact with the surface of the battery module 2, thereby improving the accuracy of temperature acquisition.

[0018] Specifically, the wireless data transmission module is integrated at the end of the distributed temperature sensing unit, using the LoRa wireless communication protocol to transmit the temperature data collected by the NTC thermistor 5 to the local control module in real time. The LoRa protocol has the advantages of strong anti-interference capability, long transmission distance and low power consumption, and can adapt to the complex electromagnetic environment inside the liquid-cooled energy storage container, ensuring the stability and real-time performance of temperature data transmission. Fine copper wires (0.1mm in diameter) are integrated inside the flexible sensing substrate. One end of the wire is soldered to the pin of each thermistor, and the other end converges to the end interface of the substrate (connected to the wireless data transmission module). When soldering the NTC thermistor 5, it is first soldered onto the pre-reserved pads on the surface of the flexible sensing substrate using SMT (Surface Mount Technology) technology. For fixation, the welding temperature is controlled at 220-240℃ (to avoid damaging the substrate material). After welding, an epoxy resin insulating adhesive (0.05-0.1mm thick) is applied to the surface of the thermistor and the pads to prevent electrical short circuits and enhance mechanical fixation strength. The entire surface of the flexible sensing substrate is coated with an insulating and thermally conductive coating, which directly covers the surface of the thermistor, allowing the heat from the battery module to be quickly conducted to the thermistor through the coating, reducing temperature measurement lag. The flexible sensing substrate is made of polyimide material, which is extremely thin, and the additional impedance to the heat conduction path is negligible. Moreover, the thermal conductivity of the ceramic insulating and thermally conductive coating on the substrate surface is much higher than that of air. When the substrate is attached to the surface of the module, the coating can replace the "air gap" between the module and the air, reducing heat dissipation obstacles.

[0019] Specifically, the local control module is installed on the inner wall of the enclosure 1 and includes an MCU chip, a data storage unit, and an alarm triggering unit. The MCU chip is used to receive temperature data sent by the wireless data transmission module and compare it with a preset temperature threshold. The data storage unit is used to store temperature data. The alarm triggering unit triggers an audible and visual alarm when the temperature reaches the alarm threshold. The local control module can realize local processing and rapid response of temperature data without relying on a remote platform, thus shortening the alarm delay time.

[0020] Specifically, such as Figure 2 , 3As shown, the flexible mounting mechanism 3 is used to fix the distributed temperature sensing unit to the surface of the battery module 2. It includes a magnetic base 6, an elastic pressure plate 7, and an adjusting bolt 8. The magnetic base 6 is attached to the metal shell of the battery module 2. One end of the elastic pressure plate 7 is hinged to the magnetic base 6, and the other end is pressed against the flexible sensing substrate 4 by the adjusting bolt 8. Through the adsorption of the magnetic base 6, the installation and positioning can be quickly achieved. The elastic deformation of the elastic pressure plate 7 can adapt to the unevenness of the surface of the battery module 2, ensuring that the flexible sensing substrate 4 is always tightly attached to the battery module 2. The side of the elastic pressure plate 7 facing the flexible sensing substrate 4 is integrally provided with an arc-shaped convex plate, which is used to press the flexible sensing substrate 4. The adjusting bolt 8 is threadedly connected to the upper surface of the magnetic base 6, and the elastic pressure plate 7 is provided with a through hole for the adjusting bolt 8 to pass through. The diameter of the through hole is larger than the diameter of the adjusting bolt 8 body, and the side wall of the adjusting bolt 8 is coaxially provided with a pressing plate located above the elastic pressure plate 7. The diameter of the pressing plate is larger than the diameter of the through hole.

[0021] Specifically, the power supply module includes a lithium battery pack and a charging interface. The lithium battery pack powers the distributed temperature sensing unit and the wireless data transmission module, while the charging interface is connected to the backup power supply of the liquid-cooled energy storage container. The lithium battery pack ensures that the components can still work normally when the backup power supply fails, while the charging interface provides continuous power supply to avoid monitoring interruptions due to power failure.

[0022] Preferably, the flexible sensing substrate 4 is made of polyimide with a thickness of 0.1-0.2 mm and a temperature range of -40-125℃. The surface of the flexible sensing substrate 4 is coated with an insulating thermally conductive coating with a thermal conductivity ≥1.5 W / (m・K). The polyimide material has excellent flexibility and high temperature resistance, which can adapt to the operating temperature range of the battery module. The insulating thermally conductive coating can not only ensure electrical insulation and prevent short circuit risk, but also improve heat conduction efficiency, enabling the NTC thermistor 5 to quickly sense the temperature change of the battery module.

[0023] Preferably, in the distributed temperature sensing unit, the detection range of each NTC thermistor 5 covers 1-2 battery cells 10; by reasonably setting the coverage range of the NTC thermistor 5, the monitoring accuracy can be guaranteed while avoiding the increased cost and complex wiring caused by too many sensors, thus achieving a balance between monitoring efficiency and cost.

[0024] Preferably, the preset temperature thresholds include a normal operating temperature of 0-45℃ and an alarm threshold of ≥45℃. When the MCU chip detects that the temperature data is within 0-45℃, it determines that the battery module is in normal operating condition. When the temperature data reaches or exceeds 45℃, it determines that the battery module temperature is abnormal, and the MCU chip controls the alarm triggering unit to immediately trigger an audible and visual alarm to remind staff to intervene in a timely manner.

[0025] Preferably, the magnetic base 6 of the flexible mounting mechanism 3 uses neodymium iron boron permanent magnets with an attraction force ≥50N. The strong attraction of the neodymium iron boron permanent magnets ensures that the magnetic base is firmly attached to the metal casing of the battery module, preventing the component from falling off during transportation or vibration, thus improving installation stability. The adjusting bolt 8 of the flexible mounting mechanism 3 is made of plastic. Plastic is insulating, preventing conductive contact between the adjusting bolt 8 and the wires inside the battery module 2 casing or the flexible sensing substrate 4, avoiding short circuit risks. Simultaneously, the lightweight nature of plastic reduces the overall weight of the component, decreasing the load on the battery module 2. The elastic pressure plate 7 of the flexible mounting mechanism 3 is made of stainless steel and has a deformation allowance of 0-5mm. Stainless steel material has high strength and good elastic recovery ability, which can maintain the elastic deformation state for a long time without being easily damaged. The deformation allowance of 0-5mm can fully adapt to the unevenness of the surface of the battery module 2, ensuring that the flexible sensing substrate 4 can be tightly attached to the surface of the battery module 2 in different positions. The elastic pressure plate 7 is provided with a rubber or silicone pad 9 at the corresponding position of the flexible sensing substrate 4. The pad can increase the contact area between the elastic pressure plate 7 and the flexible sensing substrate 4, avoiding excessive local pressure on the flexible sensing substrate 4 caused by the elastic pressure plate 7, which could lead to substrate damage or displacement of the NTC thermistor 5. At the same time, the pad 9 can also play a buffering role, reducing the impact of vibration on the flexible sensing substrate 4 and improving the vibration resistance of the component.

[0026] Taking a battery temperature monitoring component applied to a 40-foot liquid-cooled energy storage container as an example, the technical solution of this application will be described in detail: The liquid-cooled energy storage container includes a container body, inside which 42 lithium iron phosphate battery modules are installed, such as... Figure 6 As shown, each battery module contains 6 battery cells. The metal casing of the battery module is made of cold-rolled low-carbon steel or ferritic stainless steel, and the surface flatness error is ≤2mm. The flexible sensing substrate is made of polyimide with a thickness of 0.15mm and a temperature range of -40-125℃. The surface is coated with a ceramic insulating and thermally conductive coating with a thermal conductivity of 2.0W / (m・K) and a coating thickness of 0.08mm. The NTC thermistor uses a 0603 packaged NTC thermistor (model NCP18XH103F03RC) with an accuracy of ±0.3℃. A total of 6 thermistors are arranged evenly on the flexible sensing substrate. The detection range of each NTC thermistor covers one battery cell, ensuring full coverage of the side of the battery module. The wireless data transmission module adopts a LoRa wireless communication module (model RA-02), which is integrated on one end of the flexible sensing substrate. It operates at a frequency of 433MHz, has a transmission power of 17dBm, a transmission distance of ≥50m, supports simultaneous communication of multiple nodes, and can transmit temperature data collected by NTC thermistors to the local control module in real time with a data transmission delay of ≤0.5s. The local control module is installed on the inner wall of the enclosure (near the middle area of ​​the battery module), and the shell is made of ABS flame-retardant material. The MCU chip uses an STM32L431RCT6 microcontroller with a main frequency of 80MHz and low power consumption. It can receive temperature data sent by the wireless data transmission module in real time and compare it with the preset temperature threshold. The data storage unit uses a 16GB SD card, which can store nearly 96 hours of temperature data (sampling frequency 1 time / 100ms), and supports data export and retrospective analysis. The alarm triggering unit includes a red LED indicator (brightness ≥500cd / m²) and a buzzer (volume ≥90dB). When the temperature reaches the alarm threshold ≥45℃, the LED flashes (frequency 1Hz) and the buzzer sounds continuously. The magnetic base uses neodymium iron boron permanent magnets with an attraction force of 65N. There are 4 magnets in total, which are arranged at the four corners of the flexible sensing substrate. The elastic pressure plate is made of 304 stainless steel with a deformation allowance of 3mm. One end is hinged to the magnetic base, and the other end has a through hole. The adjusting bolt is made of PA66 plastic and passes through the through hole to engage with the internal thread hole of the magnetic base to adjust the pressure of the elastic pressure plate. The gasket is made of silicone and is attached to the contact area between the elastic pressure plate and the flexible sensing substrate to increase the contact area and prevent damage to the substrate. The lithium battery pack uses two 18650 lithium batteries (capacity 2500mAh, output voltage 3.7V), and outputs 3.3V through a voltage conversion module to power the distributed temperature sensing unit and the wireless data transmission module, with a battery life of ≥96h; The charging interface uses a Type-C interface and is connected to the 12V backup power supply of the liquid-cooled energy storage container through a step-down module (output 5V / 1A). When the lithium battery pack 71 charge is lower than 20%, it will automatically trigger charging to ensure continuous power supply.

[0027] The work process is as follows: 1. The NTC thermistor collects temperature data from the side of the battery module in real time, once every 100ms, and transmits it to the wireless data transmission module through the wires in the flexible sensing substrate. 2. The wireless data transmission module adopts the LoRa protocol to send temperature data to the local control module in real time. During the transmission process, the data is automatically encrypted to prevent interference or tampering. 3. After receiving the temperature data, the MCU chip compares it with the preset threshold (normal operating temperature 0-45℃, alarm threshold ≥45℃): If the temperature is between 0-45℃, the data is stored in the data storage unit and the LED indicator is constantly lit (green); if the temperature reaches or exceeds 45℃, the MCU chip immediately controls the alarm trigger unit to start the audible and visual alarm (red LED flashing, buzzer alarm), and at the same time stores the alarm information in the data storage unit for easy subsequent traceability.

[0028] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A battery temperature monitoring component for a liquid-cooled energy storage container, the liquid-cooled energy storage container comprising a container body (1), wherein a plurality of battery modules (2) are installed inside the container body (1), and the battery temperature monitoring component is installed on the battery modules (2), characterized in that: The monitoring component includes a distributed temperature sensing unit, a wireless data transmission module, a local control module, a flexible mounting mechanism (3), and a power supply module; The distributed temperature sensing unit is used to collect temperature data of the battery module (2), including a flexible sensing substrate (4) and multiple NTC thermistors (5) arranged on the flexible sensing substrate (4). The flexible sensing substrate (4) is attached to the side of the battery module (2). The wireless data transmission module is integrated at the end of the distributed temperature sensing unit and adopts the LoRa wireless communication protocol to transmit the temperature data collected by the NTC thermistor (5) to the local control module in real time. The local control module is installed on the inner wall of the enclosure (1) and includes an MCU chip, a data storage unit and an alarm triggering unit. The MCU chip is used to receive temperature data sent by the wireless data transmission module and compare it with a preset temperature threshold. The data storage unit is used to store temperature data. The alarm triggering unit triggers an audible and visual alarm when the temperature reaches the alarm threshold. The elastic mounting mechanism (3) is used to fix the distributed temperature sensing unit to the surface of the battery module (2), including a magnetic base (6), an elastic pressure plate (7) and an adjusting bolt (8). The magnetic base (6) is attached to the metal shell of the battery module (2). One end of the elastic pressure plate (7) is hinged to the magnetic base (6), and the other end is pressed against the flexible sensing substrate (4) by the adjusting bolt (8). The power supply module includes a lithium battery pack and a charging interface. The lithium battery pack supplies power to the distributed temperature sensing unit and the wireless data transmission module. The charging interface is connected to the backup power supply of the liquid-cooled energy storage container.

2. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 1, characterized in that: The flexible sensing substrate (4) is made of polyimide with a thickness of 0.1-0.2 mm and a temperature range of -40-125℃. The surface of the flexible sensing substrate (4) is coated with an insulating and thermally conductive coating with a thermal conductivity of ≥1.5 W / (m・K).

3. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 1, characterized in that: In the distributed temperature sensing unit, the detection range of each NTC thermistor (5) covers 1-2 battery cells (10).

4. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 1, characterized in that: The preset temperature thresholds include normal operating temperature of 0-45℃ and alarm threshold of ≥45℃.

5. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 1, characterized in that: The magnetic base (6) of the elastic mounting mechanism (3) is made of neodymium iron boron permanent magnet with an adsorption force ≥50N.

6. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 5, characterized in that: The adjusting bolt (8) of the elastic mounting mechanism (3) is made of plastic.

7. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 6, characterized in that: The elastic pressure plate (7) of the elastic mounting mechanism (3) is made of stainless steel and has a deformation allowance of 0-5mm.

8. The battery temperature monitoring component of the liquid-cooled energy storage container according to claim 7, characterized in that: The elastic pressure plate (7) is provided with a gasket (9) at the position corresponding to the flexible sensing substrate (4).

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