Hydrogen concentration sensor module

Abstract

The utility model discloses a hydrogen concentration sensor module, which adopts a heat conduction type hydrogen sensor probe and has faster response time and longer service life. The module is small in size and only occupies a small space on a battery pack BMS circuit board; analog quantity is supported, the UART interface and the SPI interface are arranged for output, and selectivity is high; the module is packaged by the stamp holes, and can be subjected to surface mount processing together with other components in the production process of the BMS circuit board of the battery pack, so that the manufacturing process of the BMS circuit board is simplified; the whole module is covered with a metal shielding cover, so that the electromagnetic compatibility of the module can be effectively improved; the metal shielding case is provided with the gas exchange holes, and the waterproof breathable film is pasted at the position corresponding to the exchange holes on the inner side of the shielding case, so that the influence of external sundries, moisture and the like on the sensor can be resisted, high efficiency and stability are realized, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery thermal management, and in particular relates to a hydrogen concentration sensor module. Background Art

[0002] A large number of experiments have shown that both ternary lithium and lithium iron phosphate will release a certain amount of hydrogen before the battery pack experiences thermal runaway, and when the hydrogen concentration reaches 4%, there is a risk of explosion. Therefore, it is of great significance to integrate a hydrogen sensor with hydrogen concentration detection function in the lithium battery pack, which can warn before the lithium battery pack experiences thermal runaway, so that measures can be taken in advance to avoid thermal runaway or provide more escape time for personnel safety.

[0003] The hydrogen concentration sensor is a converter that converts the volume fraction of hydrogen in different components into an electrical signal. The electrical signal output by the hydrogen sensor is filtered, amplified, and converted from digital to analog, and then collected by a microcontroller, displayed, or transmitted to other acquisition systems. The hydrogen concentration sensor module consists of parts such as a hydrogen sensor probe, a signal conditioning circuit, an analog-to-digital conversion circuit, and a microcontroller. The production and manufacturing of hydrogen concentration sensors requires a certain degree of professionalism and is generally manufactured and tested by professional manufacturers. Battery pack manufacturers only need to simply connect the module to use it, which greatly reduces the technical threshold for hydrogen detection applications.

[0004] In the current lithium battery thermal runaway warning applications, many battery pack management systems (BMS) still use temperature signals as the judgment of thermal runaway warning, but the conduction of temperature is slower than that of hydrogen; even if some hydrogen sensors are selected, they are often connected to the battery pack BMS circuit board through cable plug-in modules, which takes up the already very limited space in the battery pack and has a low degree of integration. Therefore, it is necessary to develop a miniaturized hydrogen concentration sensor module that is easy to use, can be truly integrated into the BMS circuit board, and is convenient for unified management of the BMS system. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a hydrogen concentration sensor module.

[0006] The technical solution provided by the utility model is as follows:

[0007] A hydrogen concentration sensor module comprises a hydrogen sensor arranged on a module substrate, and a metal shielding cover covering the hydrogen sensor and fixedly arranged on the module substrate; a plurality of input and output interfaces for supplying power to the hydrogen sensor or outputting signals are arranged on both sides of the module substrate; a plurality of ventilation holes are opened on the metal shielding cover at a position facing the hydrogen sensor.

[0008] Furthermore, the input and output interface includes an analog signal output interface and a digital signal output interface, and the digital signal output interface includes a universal asynchronous receiver and transmitter interface and a serial peripheral interface.

[0009] Furthermore, a microcontroller, an analog-to-digital converter and an amplifying and filtering circuit are connected between the digital signal output interface and the hydrogen sensor.

[0010] Furthermore, a waterproof and breathable membrane is provided on one side of the vent hole close to the hydrogen sensor.

[0011] Furthermore, the hydrogen sensor is a thermal conductivity hydrogen sensor.

[0012] Beneficial effects of the utility model:

[0013] The utility model designs a compact hydrogen concentration sensor module, which adopts a thermal conductivity hydrogen sensor probe and has a faster response time and a longer service life. The module is compact (25×20×2.5mm) and occupies only a small space on the battery pack BMS circuit board. It supports analog quantity, universal asynchronous receiver / transmitter (UART) interface, and serial peripheral (SPI) interface to connect with the battery pack BMS circuit board, with a wide range of selectivity. The module adopts stamp hole packaging and can be processed together with other components during the production process of the battery pack BMS circuit board, thereby simplifying the manufacturing process of the BMS circuit board. The entire module is covered with a metal shielding cover, which can effectively improve the electromagnetic compatibility (EMC) performance of the module. Gas exchange holes are left on the metal shielding cover, and a waterproof and breathable film is pasted at the corresponding position of the exchange hole on the inner side of the shielding cover, which can resist the influence of external debris, moisture, etc. on the sensor, and is efficient and stable, and has a longer service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0015] Figure 1 This is a schematic diagram of the three-dimensional structure of a hydrogen concentration sensor module provided by an embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the components of a hydrogen concentration sensor module provided by an embodiment of the present utility model.

[0017] Among them, the reference numerals are as follows: 1-module substrate, 2-metal shielding cover, 3-hydrogen sensor probe, 4-waterproof breathable membrane, 5-vent, 6-interface. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 and Figure 2 As shown, the hydrogen concentration sensor module provided by the utility model is mainly composed of a module substrate 1, a metal shielding cover 2 and a hydrogen sensor. Among them, the hydrogen sensor is fixedly arranged on the module substrate 1, and a thermal conductivity hydrogen sensor is adopted. Compared with the electrochemical hydrogen sensor, it has a smaller volume and service life. It is also more durable and has a wider measurement range than the catalytic combustion hydrogen sensor. Multiple interfaces 6 connected to the hydrogen sensor probe 3 and the battery pack BMS are arranged on both sides of the module substrate 1, which are used to power the hydrogen concentration sensor module or output the output signal of the hydrogen concentration sensor module. The signal output interface includes an analog signal output interface and a digital signal output interface. The digital signal output interface includes a universal asynchronous receiver and transmitter (UART) interface and a serial peripheral (SPI) interface, which is convenient for users to choose to use. A microcontroller, an analog-to-digital converter and an amplification and filtering circuit are also connected between the digital signal output interface and the hydrogen sensor probe 3. After the signal output by the hydrogen sensor probe 3 passes through the amplification and filtering circuit, it is connected to the analog-to-digital converter to convert it into a digital signal, and then input into the microcontroller for processing.

[0020] A metal shielding cover 2 is provided on the module substrate 1. The metal shielding cover 2 is directly welded on the module substrate 1, and a plurality of vents 5 are provided on the metal shielding cover 2 facing the hydrogen sensor probe 3 to facilitate the gas to be measured to enter and contact the hydrogen sensor probe 3. The metal shielding cover 2 can play a certain protective role on the parts on the substrate, and can also improve the electromagnetic compatibility (EMC) performance of the module as a whole, including reducing electromagnetic radiation and reducing the influence of external electromagnetic interference on hydrogen concentration measurement. A waterproof and breathable membrane 4 is provided on the inner side of the metal shielding cover 2. Before welding the shielding cover, the waterproof and breathable membrane 4 needs to be pasted on the position of the vent 5 to prevent impurities or moisture from entering and ensure the accuracy of the measurement.

[0021] The sensor module is packaged with a stamp hole as a whole, and can be processed together with other components during the production process of the battery pack BMS circuit board, thereby simplifying the manufacturing process of the BMS circuit board. Stamp holes, also known as "positioning holes", are a special hole type on the PCB board. Its shape is similar to the perforations of a stamp, hence the name. Stamp holes are usually distributed on the edge of the PCB board and are used for positioning and fixing the PCB board. During the assembly process of electronic equipment, the PCB board needs to be fixed to the chassis or other components. Through the stamp holes, the PCB board can be firmly fixed in the specified position using fasteners such as screws or tin melting welding to ensure the stability and reliability of the electronic equipment.

[0022] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hydrogen concentration sensor module, characterized in that: It includes a hydrogen sensor arranged on a module substrate, and a metal shielding cover covering the hydrogen sensor and fixedly arranged on the module substrate; a plurality of input and output interfaces for supplying power to the hydrogen sensor or outputting signals are arranged on both sides of the module substrate; a plurality of ventilation holes are opened at a position of the metal shielding cover facing the hydrogen sensor.

2. A hydrogen concentration sensor module as claimed in claim 1, characterized in that: The input and output interface includes an analog signal output interface and a digital signal output interface, and the digital signal output interface includes a universal asynchronous receiver and transmitter interface and a serial peripheral interface.

3. A hydrogen concentration sensor module as claimed in claim 2, characterized in that: A microcontroller, an analog-to-digital converter and an amplifying and filtering circuit are also connected between the digital signal output interface and the hydrogen sensor.

4. A hydrogen concentration sensor module as claimed in claim 1, characterized in that: A waterproof and breathable membrane is arranged on one side of the vent hole close to the hydrogen sensor.

5. A hydrogen concentration sensor module as claimed in claim 1, characterized in that: The hydrogen sensor is a thermal conductivity hydrogen sensor.

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