Multi-mode detection module for on-board lithium batteries

Abstract

The utility model relates to the technical field of detection module, especially for the multimode detection module for vehicle lithium battery, including multispectral imager, two multispectral imager respectively are established in the top both sides of metal frame, the inside of metal frame is equipped with a plurality of battery group, the inside of battery group is equipped with a plurality of electric core, the top of electric core is pasted with fiber bragg grating sensor, the top of battery group is equipped with three NTC film thermocouple. The support rod in the device is obliquely installed on both sides of the metal frame, which can optimize the viewing angle of the two multispectral imagers, so that the battery group can be fully covered to eliminate dead angles. The hydrogen sensor is embedded in the contact side of the battery group, which can capture combustible gas leakage in real time to speed up the early warning. The design of the protective shell can provide physical protection for the electric core and ensure the surface of the NTC film thermocouple to measure temperature. The three NTC film thermocouples are distributed on the top front, middle and back of the protective shell, which can monitor the temperature gradient and accurately locate the overheating.

Description

Technical Field

[0001] This utility model relates to the field of detection module technology, specifically to a multi-mode detection module for vehicle-mounted lithium batteries. Background Technology

[0002] Lithium-ion batteries are core energy storage components of vehicle power systems, possessing high energy density characteristics, but their thermal runaway risk needs to be controlled through monitoring technology. Existing detection modules are based on single-mode or limited multi-mode sensing technology, using temperature sensors, gas sensors, and smoke detectors to collect parameters such as temperature and gas concentration during battery operation, and then use simple threshold judgments to achieve early warning.

[0003] During the design process of this utility model, the following problems were discovered in the existing technology:

[0004] Existing automotive lithium batteries have inherent drawbacks such as high risk of thermal runaway and rapid thermal diffusion. During thermal runaway, they release flammable gases such as hydrogen, which are prone to reignition. Traditional single-mode monitoring modules rely on single-mode sensing, with temperature monitoring limited to the surface, gas detection lagging, and difficulty in timely capturing early anomalies such as short circuits and sudden temperature rises within the battery. They cannot meet the early and accurate warning requirements of automotive lithium batteries in complex scenarios. Utility Model Content

[0005] The purpose of this invention is to provide a multi-mode detection module for vehicle-mounted lithium batteries to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-mode detection module for vehicle-mounted lithium batteries, including a multispectral imager, two of the multispectral imagers being respectively disposed on the top left and right sides of a metal frame, the metal frame containing a plurality of battery packs, the battery packs containing a plurality of battery cells, and a fiber optic grating sensor being attached to the top of the battery cell.

[0007] The top of the battery pack is equipped with three NTC thin-film thermocouples.

[0008] The beneficial effects of this utility model are as follows: Two support rods are installed obliquely on both sides of the top of the metal frame, which can optimize the viewing angle of the multispectral imager, thereby fully covering the battery pack, eliminating monitoring blind spots, and ensuring continuous and reliable smoke monitoring. The hydrogen sensor is embedded on the contact side of the battery pack, facing the module gap, which can detect the initial flammable gas leakage in the early stage of thermal runaway and improve the early warning speed. The design of the protective shell can provide physical protection for the battery pack and the sensor. At the same time, its flat surface ensures that the thermocouple can effectively measure the temperature. The flame-retardant material delays the heat diffusion. The three thermocouples are distributed at the front, middle and rear of the top of the protective shell, which can monitor the temperature gradient, accurately locate local overheating, and provide multi-dimensional support for thermal runaway early warning.

[0009] To optimize the monitoring angle of the multispectral imager and fully cover the battery pack area inside the metal frame downwards, avoiding blind spots caused by vertical installation:

[0010] The device is further configured such that: the bottom of the two multispectral imagers is provided with two support rods, the bottom ends of the two support rods are respectively located on the top left and right sides of the metal frame, and the two support rods are set at relative inclinations.

[0011] By adopting the above technical solution, the support rods at the bottom of the two multispectral imagers are respectively installed on the top left and right sides of the metal frame, and the two support rods are set at relative inclination. This structural design can optimize the monitoring angle of the imager by tilting the angle, so that the lens can fully cover the battery pack area inside the metal frame downwards, avoid monitoring blind spots caused by vertical installation, and ensure the continuity and reliability of smoke particle monitoring.

[0012] To enable the immediate detection of gas concentration changes using hydrogen sensors, thus facilitating the early detection of gas leaks in the initial stages of thermal runaway and improving early warning response speed, thereby buying time for subsequent handling:

[0013] A further configuration is provided: several hydrogen sensors are embedded in the contact sides of several of the battery packs.

[0014] By adopting the above technical solution, since the battery pack contact side is the main channel for the release of combustible gas during thermal runaway, embedding a hydrogen sensor here and placing it directly opposite the module gap can capture changes in gas concentration at the first moment, detect gas leaks in the early stage of thermal runaway earlier, improve the early warning response speed, and buy time for subsequent handling.

[0015] To ensure the protective housing can protect the internal battery cells from vibration, impact, and foreign object intrusion in the vehicle environment, while simultaneously providing a mounting platform for the NTC thin-film thermocouple to achieve effective heat conduction and delay heat dissipation, thus buying time for monitoring and fire suppression:

[0016] A further feature is provided: the battery pack is provided with a protective casing.

[0017] By adopting the above technical solution, the battery pack is equipped with a protective shell, which on the one hand provides physical protection for the internal cells and sensors, resisting vibration, impact and intrusion of foreign objects in the vehicle environment. On the other hand, it can serve as a mounting carrier for NTC thin film thermocouples. The flat shell surface ensures effective heat conduction between the thermocouple and the battery pack. At the same time, the flame-retardant material of the protective shell can delay heat diffusion, buying time for monitoring and fire extinguishing.

[0018] To enable NTC thin-film thermocouples to monitor the temperature gradient changes on the surface of the battery pack in real time, and to accurately locate local overheating areas by comparing temperature data from different locations, thus avoiding the limitations of a single temperature measurement point:

[0019] The configuration is further defined as follows: the three NTC thin-film thermocouples are respectively located at the front, middle and rear positions of the top of the protective shell.

[0020] By adopting the above technical solution, three NTC thin-film thermocouples are respectively set at the front, middle and rear of the top of the protective shell. This distributed layout can monitor the temperature gradient change on the surface of the battery pack in real time. By comparing the temperature data at different locations, the local overheating area can be accurately located, avoiding the limitations of a single temperature measurement point. At the same time, it provides multi-dimensional data support for thermal runaway trend analysis, making the judgment of temperature anomalies more accurate and providing early warning of potential thermal diffusion risks.

[0021] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0022] Figure 1 This is a side sectional view of the present invention;

[0023] Figure 2 This is a schematic diagram of the multispectral imager of this utility model;

[0024] Figure 3 This is a schematic diagram of the battery pack of this utility model;

[0025] Figure 4 This is a schematic diagram of the fiber Bragg grating sensor of this utility model;

[0026] Figure 5 This is an electrical flow chart of the present invention.

[0027] In the figure: 1. Multispectral imager; 101. Support rod; 2. Metal frame; 3. Battery pack; 301. Hydrogen sensor; 302. Protective shell; 4. Battery cell; 5. Fiber optic grating sensor; 6. NTC thin film thermocouple. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of the present invention in any way.

[0029] Please see Figures 1 to 5 A multi-mode detection module for vehicle-mounted lithium batteries includes a multispectral imager 1. Two multispectral imagers 1 are respectively located on the top left and right sides of a metal frame 2. Several battery packs 3 are located inside the metal frame 2. Several battery cells 4 are located inside the battery packs 3. A fiber optic grating sensor 5 is attached to the top of the battery cell 4.

[0030] The top of the battery pack 3 is equipped with three NTC thin-film thermocouples 6.

[0031] In this embodiment, as Figure 1 and Figure 2 As shown, the bottom of the two multispectral imagers 1 is provided with two support rods 101. The bottom ends of the two support rods 101 are respectively located on the top left and right sides of the metal frame 2, and the two support rods 101 are set at relative inclination.

[0032] In this embodiment, as Figure 1 and Figure 3 and Figure 4 As shown, several hydrogen sensors 301 are embedded in the contact side of several battery packs 3.

[0033] In this embodiment, as Figure 1 and Figure 3 As shown, the battery pack 3 is provided with a protective shell 302.

[0034] In this embodiment, as Figure 1 and Figure 3 As shown, three NTC thin-film thermocouples 6 are respectively located at the front, middle and rear of the top of the protective shell 302.

[0035] The multi-mode detection module for automotive lithium batteries operates as follows:

[0036] First, when the vehicle-mounted lithium battery multi-mode detection module is put into operation, the module completes initialization with the vehicle power supply and enters the all-time monitoring process.

[0037] During startup, after the system is powered on, the two multispectral imagers 1 (model: FLIRA315) are obliquely supported on the top left and right sides of the metal frame 2 by the support rods 101. The lenses cover the entire area of ​​the battery pack 3 downwards and scan smoke particles of 0.1-10μm. The fiber optic grating sensor 5 (model: OSISystemsSM125-500) attached to the top of the battery cell 4 can continuously collect the internal temperature of the battery cell 4 by directly contacting the surface of the battery cell 4. The NTC thin film thermocouples 6 (model: TDKB58500) set at the front, middle and rear positions of the top of the protective shell 302 in the battery pack 3 will monitor the temperature change of the surface of the battery pack 3 by closely adhering to the protective shell 302. The hydrogen sensor 301 (model: Sensing&ControlH2-A1) embedded on the contact side of the adjacent battery pack 3 captures combustible gases such as H2 because it is directly facing the module gap.

[0038] During the monitoring phase, the multispectral imager 1 captures a global view of the battery pack 3 at a fixed frequency. Its optical lens can capture the dynamics of smoke particles, while the fiber optic grating sensor 5 senses subtle temperature fluctuations in real time through the surface of the attached battery cell 4. The NTC thin-film thermocouple 6 can record the temperature values ​​of the front, middle and rear areas of the battery pack 3 respectively, thereby forming gradient data. At the same time, the gas detection port of the hydrogen sensor 301 continuously draws in the gas released from the gap between the modules and analyzes the concentration change of H2 simultaneously. All data is continuously transmitted to the external control unit for multi-dimensional fusion analysis.

[0039] During the judgment and response phase, different levels of action can be triggered based on the physical parameter thresholds collected by each sensor. If the multispectral imager 1 lens does not capture smoke, the temperature of the battery cell 4 sensed by the fiber optic grating sensor 5 is stable, the temperature of the protective shell 302 measured by the NTC thin-film thermocouple 6 shows no significant change, and there is no abnormal gas at the detection port of the hydrogen sensor 301, the system maintains normal monitoring. However, when a faint smoke outline appears on the multispectral imager 1 lens, the surface temperature of the battery cell 4 attached to the fiber optic grating sensor 5 rises at an accelerated rate, the temperature at a certain point of the NTC thin-film thermocouple 6 exceeds the reference value, or the H2 concentration at the detection port of the hydrogen sensor 301 slightly increases, its module will trigger the physical warning corresponding to the blue alert. If the smoke concentration on the multispectral imager 1 lens increases, the temperature of the battery cell 4 monitored by the fiber optic grating sensor 5 continues to rise, the temperature difference between the three points of the NTC thin-film thermocouple 6 widens, or the H2 concentration at the detection port of the hydrogen sensor 301 significantly increases... When the temperature rises, the module will activate the enhanced warning corresponding to the yellow warning and link the vehicle's BMS alarm. When the fiber optic grating sensor 5 detects a sudden increase in the temperature of the cell 4, and when the surface temperature of the cell 4 to which the fiber optic grating sensor 5 is attached rises suddenly, the NTC thin film thermocouple 6 detects that the temperature of the protective shell 302 exceeds the critical value, dense smoke appears in the lens of the multispectral imager 1, and the H2 concentration at the detection port of the hydrogen sensor 301 reaches the dangerous value, the module will link the fire extinguishing system and activate the fine water mist nozzle near the metal frame 2 to spray droplets onto the battery pack 3. At the same time, the multispectral imager 1 continuously observes the smoke dissipation, while the fiber optic grating sensor 5 and the NTC thin film thermocouple 6 track the temperature decrease trend of the cell 4 and the protective shell 302. Meanwhile, the hydrogen sensor 301 monitors the gas concentration to drop until all physical parameters return to normal. Through the coordination of the physical installation positions, all components achieve early detection and graded response to lithium battery thermal runaway.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0041] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The above examples are only for the purpose of helping to understand the method and core ideas of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that due to the limitations of textual expression, there are objectively infinite specific structures. For those skilled in the art, several improvements, modifications, or changes can be made without departing from the principles of this utility model, and the above technical features can also be combined in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without modification, should all be considered within the protection scope of this utility model.

Claims

1. A multi-mode detection module for vehicle-mounted lithium batteries, comprising a multispectral imager (1), characterized in that: Two multispectral imagers (1) are respectively located on the top left and right sides of the metal frame (2). The metal frame (2) contains several battery packs (3), and the battery packs (3) contain several cells (4). A fiber optic grating sensor (5) is attached to the top of the cells (4). The top of the battery pack (3) is provided with three NTC thin-film thermocouples (6).

2. The multi-mode detection module for vehicle-mounted lithium batteries as described in claim 1, characterized in that: The bottom of the two multispectral imagers (1) is provided with two support rods (101), and the bottom ends of the two support rods (101) are respectively located on the top left and right sides of the metal frame (2), and the two support rods (101) are set at relative inclination.

3. The multi-mode detection module for vehicle-mounted lithium batteries as described in claim 1, characterized in that: Several hydrogen sensors (301) are embedded in the contact side of several of the battery packs (3).

4. The multi-mode detection module for vehicle-mounted lithium batteries as described in claim 1, characterized in that: The battery pack (3) is provided with a protective shell (302).

5. The multi-mode detection module for vehicle-mounted lithium batteries as described in claim 4, characterized in that: The three NTC thin-film thermocouples (6) are respectively located at the front, middle and rear of the top of the protective shell (302).

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