Thermal runaway detection device

Abstract

The utility model discloses a thermal runaway detection device. The thermal runaway detection device comprises an optical detection module, an air pressure detection module and a control module, the optical detection module comprises a visible light broadband spectrum demodulation unit and an infrared broadband spectrum demodulation unit; the visible light broadband spectrum demodulation unit is used for detecting real-time visible light information in the battery pack and sending the real-time visible light information to the control module; the infrared broadband spectrum demodulation unit is used for detecting real-time infrared light information in the battery pack and sending the real-time infrared light information to the control module; the air pressure detection module is electrically connected with the control module and is used for detecting real-time air pressure information in the battery pack and sending the air pressure information to the control module; and the control module is used for determining whether the battery pack is in a thermal runaway state or not according to the real-time visible light information, the real-time infrared light information and the real-time air pressure information. By adopting the technical means, the thermal runaway detection precision can be improved, and the high-voltage battery pack can be protected.

Description

Technical Field

[0001] The utility model relates to the technical field of automobiles, and in particular to a thermal runaway detection device. Background Art

[0002] Thermal runaway sensing technology is widely used in the field of automotive battery pack safety protection, used to monitor the battery pack's operating status in real time and implement relevant safety alarm strategies. Currently, there are two mainstream technical approaches to thermal runaway sensing: air pressure detection and aerosol combustion particulate matter monitoring.

[0003] Air pressure detection uses abnormal air pressure during thermal runaway as the detection target and uses this as the basis for related protection alarm strategies. Aerosol combustion particulate matter detection uses the concentration of gas particles during thermal runaway as the detection target and uses this as the basis for related protection alarm strategies.

[0004] However, due to energy conservation needs, battery packs are becoming increasingly high voltage (passenger vehicles are gradually adopting 800V platforms, 400V platforms are gradually being phased out, and commercial vehicles are adopting platforms greater than or equal to 800V). This has reduced the applicability of the two existing technical routes, leading to the possibility of untimely identification, delayed alarms, and wasted escape time. Furthermore, popular thermal runaway sensors on the market only have a single detection method, capable of detecting only air pressure or particulate matter concentration. This failure to integrate two or more detection methods results in low reliability. Utility Model Content

[0005] The utility model provides a thermal runaway detection device to improve the detection accuracy of thermal runaway and realize the protection of high-voltage battery packs.

[0006] The embodiment of the utility model provides a thermal runaway detection device, comprising: an optical detection module, an air pressure detection module and a control module;

[0007] The optical detection module includes a visible light broadband demodulation unit and an infrared broadband demodulation unit; both the visible light broadband demodulation unit and the infrared broadband demodulation unit are electrically connected to the control module; the visible light broadband demodulation unit is used to detect real-time visible light information inside the battery pack and send the real-time visible light information to the control module; the infrared broadband demodulation unit is used to detect real-time infrared light information inside the battery pack and send the real-time infrared light information to the control module;

[0008] The air pressure detection module is electrically connected to the control module and is used to detect real-time air pressure information inside the battery pack and send the air pressure information to the control module;

[0009] The control module is configured to determine whether the battery pack is in a thermal runaway state based on the real-time visible light information, the real-time infrared light information, and the real-time air pressure information.

[0010] Optionally, the thermal runaway detection device further includes: a power management module, a first quiescent current control module, and a second quiescent current control module;

[0011] The power management module is electrically connected to the first quiescent current control module and the second quiescent current control module, respectively, and is used to supply power to the first quiescent current control module and the second quiescent current control module;

[0012] The first static current control module is electrically connected to the visible light wide spectrum demodulation unit and the infrared wide spectrum demodulation unit respectively, and is used to control the working states of the visible light wide spectrum demodulation unit and the infrared wide spectrum demodulation unit;

[0013] The second static current control module is electrically connected to the air pressure detection module and is used to control the working state of the air pressure detection module.

[0014] Optionally, the visible light wide spectrum demodulation unit includes: a first filter amplifier, n first photodiodes and n first switches; wherein n≥2, and n is an integer;

[0015] The cathodes of n first photodiodes are electrically connected to the first static current control module, the anode of the i-th first photodiode is electrically connected to the first end of the i-th first switch, and the second ends of n first switches are electrically connected to the input end of the first filter amplifier; the output end of the first filter amplifier is electrically connected to the control module.

[0016] Wherein, 1≤i≤n, and i is an integer.

[0017] Optionally, the infrared wide spectrum demodulation unit includes: a second filter amplifier, k second photodiodes and k second switches; wherein k≥2, and k is an integer;

[0018] The cathodes of k second photodiodes are electrically connected to the first static current control module, the anode of the jth second photodiode is electrically connected to the first end of the jth second switch, and the second ends of k second switches are electrically connected to the input end of the second filter amplifier; and the output end of the second filter amplifier is electrically connected to the control module;

[0019] Wherein, 1≤j≤k, and j is an integer.

[0020] Optionally, the air pressure detection module includes: a first positive pressure resistor, a second positive pressure resistor, a first negative pressure resistor, a second negative pressure resistor and a third filter amplifier;

[0021] The first end of the first positive voltage resistor is electrically connected to the first end of the first negative voltage resistor and the second static current control module respectively; the second end of the first positive voltage resistor is electrically connected to the first end of the second negative voltage resistor and the first input end of the third filter amplifier respectively; the second end of the second negative voltage resistor is electrically connected to the first end of the second positive voltage resistor and the ground end respectively; the second end of the second positive voltage resistor is electrically connected to the second end of the first negative voltage resistor and the second input end of the third filter amplifier respectively; and the output end of the third filter amplifier is electrically connected to the control module.

[0022] Optionally, the thermal runaway detection device further includes: an alarm module;

[0023] The alarm module is electrically connected to the control module and is used to issue an alarm signal according to the thermal runaway detection result information output by the control module.

[0024] Optionally, the thermal runaway detection device further includes: a communication module;

[0025] The communication module is communicatively connected to the control module and the terminal device respectively, and the control module is used to send thermal runaway detection result information to the terminal device through the communication module.

[0026] Optionally, the thermal runaway detection device further includes: a housing;

[0027] The optical detection module, the air pressure detection module and the control module are all located in the housing.

[0028] Optionally, the housing includes: an end cover and a main body shell;

[0029] The end cover is located on a side of the main body shell close to the main contact of the battery pack.

[0030] Optionally, the end cover includes a light guide cover.

[0031] The technical solution provided by the embodiment of the present utility model detects real-time visible light information inside the battery pack through a visible light wide-spectrum demodulation unit, detects real-time infrared light information inside the battery pack through an infrared wide-spectrum demodulation unit, and detects real-time air pressure information inside the battery pack through an air pressure detection module. The control module determines whether the battery pack is in a thermal runaway state based on the real-time visible light information, real-time infrared light information and real-time air pressure information. In this way, optical detection and air pressure detection can be combined, which is conducive to ensuring the reliability of the detection results and realizing the protection of the high-voltage battery pack.

[0032] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic structural diagram of a thermal runaway detection device provided in an embodiment of the present utility model;

[0034] Figure 2 A schematic structural diagram of a visible light wide spectrum demodulation unit provided in an embodiment of the present utility model;

[0035] Figure 3 A schematic structural diagram of an infrared wide spectrum demodulation unit provided in an embodiment of the present utility model;

[0036] Figure 4 A schematic structural diagram of an air pressure detection module provided in an embodiment of the present utility model;

[0037] Figure 5 A schematic top view of a thermal runaway detection device provided by an embodiment of the present utility model;

[0038] Figure 6 A side view schematic diagram of a thermal runaway detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0041] Figure 1 A schematic diagram of the structure of a thermal runaway detection device provided by an embodiment of the present invention is shown in FIG. Figure 1As shown, the thermal runaway detection device includes: an optical detection module 10, an air pressure detection module 20 and a control module 30; the optical detection module 10 includes a visible light broadband demodulation unit 101 and an infrared broadband demodulation unit 102; the visible light broadband demodulation unit 101 and the infrared broadband demodulation unit 102 are both electrically connected to the control module 30; the visible light broadband demodulation unit 10 is used to detect real-time visible light information inside the battery pack and send the real-time visible light information to the control module 30; the infrared broadband demodulation unit 102 is used to detect real-time infrared light information inside the battery pack and send the real-time infrared light information to the control module 30; the air pressure detection module 20 is electrically connected to the control module 30, and is used to detect real-time air pressure information inside the battery pack and send the air pressure information to the control module 30; the control module 30 is used to determine whether the battery pack is in a thermal runaway state based on the real-time visible light information, real-time infrared light information and real-time air pressure information.

[0042] Specifically, when thermal runaway occurs, "arcing" will occur inside the high-voltage battery pack. The existing technology has not detected any abnormality by detecting particulate matter concentration and other methods, that is, it cannot detect that the battery pack is in a thermal runaway state, which will cause a safety hazard. The optical detection module 10 provided in the embodiment of the present invention includes a visible light wide-spectrum demodulation unit 101 and an infrared wide-spectrum demodulation unit 102. The visible light wide-spectrum demodulation unit 101 is used to detect real-time visible light information inside the battery pack. The real-time visible light information may include the visible light components inside the battery pack and the light intensity of each visible light component. The visible light wide-spectrum demodulation unit 101 is electrically connected to the control module 30, and the control module 30 determines the status of the battery pack based on the received real-time visible light information. Specifically, the control module 30 can store the visible light information detected by the visible light wide-spectrum demodulation unit 101. The control module 30 determines whether the difference between the real-time visible light information detected by the visible light wide-spectrum demodulation unit 101 at time T1 and the average value of several stored visible light data before time T1 exceeds the threshold. If the difference exceeds the threshold, it means that the battery pack may have a risk of thermal runaway. If the difference does not exceed the threshold, the visible light wide-spectrum demodulation unit 101 continues to monitor.

[0043] It should be noted that the visible light wide-spectrum demodulation unit 101 can perform sampling at regular intervals and send the sampling information to the control module 30. In this way, the control module 30 can store and update the visible light data obtained from each sampling. For example, if the current sampling time of the visible light wide-spectrum demodulation unit 101 is time T1, and real-time visible light information corresponding to time T1 is detected, the control module 30 can calculate the average of the 120 stored visible light data before time T1. By determining whether the difference between the real-time visible light information and the average value exceeds a threshold, it can be determined whether the battery pack is at risk of thermal runaway.

[0044] Specifically, the infrared wide-spectrum demodulation unit 102 detects the real-time infrared light information inside the battery pack. The real-time infrared light information includes the infrared light components inside the battery pack and the light intensity of each component of infrared light. Since different objects radiate different infrared light components and intensities under different temperature conditions, the control module 30 determines whether the battery pack is in a thermal runaway state based on the received real-time infrared light information and the infrared light threshold. If the real-time infrared light information exceeds the infrared light threshold, it means that the battery pack may be at risk of thermal runaway. Otherwise, the infrared wide-spectrum demodulation unit 102 continues to monitor. It can be understood that the infrared wide-spectrum demodulation unit 102 adopts a non-contact detection method, targeting the main contacts or other key positions in the battery pack, and the infrared wide-spectrum demodulation unit 102 can cooperate with the temperature sensor inside the battery pack to detect the temperature when the temperature sensor fails.

[0045] Specifically, the air pressure detection module 20 detects real-time air pressure information inside the battery pack, and the control module 30 determines the battery pack status based on the received real-time air pressure information. Specifically, the control module 30 can store the air pressure information detected by the air pressure detection module 20. Based on the difference between the real-time air pressure information detected by the air pressure detection module 20 at time T2 and the average of several stored air pressure data before time T2, the control module 30 determines whether the difference exceeds a threshold. If the difference exceeds the threshold, it indicates that the battery pack may be at risk of thermal runaway. If the difference does not exceed the threshold, the air pressure detection module 20 continues monitoring.

[0046] It should be noted that the air pressure detection module 20 can perform sampling at regular intervals and send the sampling information to the control module 30. In this way, the control module can store and update the air pressure data obtained from each sampling. For example, if the current sampling time of the air pressure detection module 20 is time T2, and the real-time air pressure information corresponding to time T2 is detected, the control module 30 can calculate the average of the 120 stored air pressure data before time T2. By determining whether the difference between the real-time air pressure information and the average value exceeds a threshold, it can be determined whether the battery pack is at risk of thermal runaway.

[0047] Specifically, the control module 30 can determine whether the battery pack is in a thermal runaway state based on real-time visible light information, real-time infrared light information, and real-time air pressure information. For example, if the control module 30 determines that the battery pack is at risk of thermal runaway based on information detected by both the optical detection module 10 and the air pressure detection module 20, the battery pack is determined to be in a thermal runaway state. This combined optical and air pressure detection method for thermal runaway detection improves thermal runaway detection accuracy and protects the high-voltage battery pack.

[0048] The thermal runaway detection device provided by the embodiment of the present utility model detects real-time visible light information inside the battery pack through a visible light wide-spectrum demodulation unit, detects real-time infrared light information inside the battery pack through an infrared wide-spectrum demodulation unit, and detects real-time air pressure information inside the battery pack through an air pressure detection module. The control module determines whether the battery pack is in a thermal runaway state based on the real-time visible light information, real-time infrared light information and real-time air pressure information. In this way, optical detection and air pressure detection can be combined, which is beneficial to ensure the reliability of the detection results and realize the protection of the high-voltage battery pack.

[0049] Optional, continue to refer to Figure 1 The thermal runaway detection device also includes: a power management module 40, a first quiescent current control module 50, and a second quiescent current control module 60; the power management module 40 is electrically connected to the first quiescent current control module 50 and the second quiescent current control module 60, respectively, for supplying power to the first quiescent current control module 50 and the second quiescent current control module 60; the first quiescent current control module 50 is electrically connected to the visible light wide spectrum demodulation unit 101 and the infrared wide spectrum demodulation unit 102, respectively, for controlling the working states of the visible light wide spectrum demodulation unit 101 and the infrared wide spectrum demodulation unit 102; the second quiescent current control module 60 is electrically connected to the air pressure detection module 20, for controlling the working state of the air pressure detection module 20.

[0050] Specifically, the power management module 40 is electrically connected to the first quiescent current control module 50 and the second quiescent current control module 60 to provide power to the first quiescent current control module 50 and the second quiescent current control module 60. Furthermore, the power management module 40 performs external and internal power sampling of the battery pack, including voltage and current sampling, providing a data sampling and execution platform for system safety protection strategies. The first static current control module 50 is electrically connected to the visible light wide-spectrum demodulation unit 101 and the infrared wide-spectrum demodulation unit 102, respectively, and the second static current control module 60 is electrically connected to the air pressure detection module 20. In this way, after the car is in the "sleep" mode, the first static current control module 50 and the second static current control module 60 are required to respectively perform static current control on the visible light wide-spectrum demodulation unit 101, the infrared wide-spectrum demodulation unit 102 and the air pressure detection module 20, that is, the current generally does not exceed 150μA. In this way, on the premise that the visible light wide-spectrum demodulation unit 101, the infrared wide-spectrum demodulation unit 102 and the air pressure detection module 20 meet the basic detection requirements, the power consumption can be controlled, thereby reducing power consumption and achieving energy saving.

[0051] It should be noted that the visible light broadband demodulation unit 101 and the infrared broadband demodulation unit 102 share the first quiescent current control module 50, while the air pressure detection module 20 and the optical detection module 10 are not electrically connected to the same quiescent current control module. Providing two quiescent current control modules facilitates independent operation of the air pressure detection module 20 and the optical detection module 10, thereby achieving flexibility in battery pack thermal runaway detection. For example, when the vehicle is in "sleep" mode, the first quiescent current control module 50 may not supply current to the optical detection module 10, i.e., the optical detection module 10 is in an inoperative state. The second quiescent current control module 60 supplies current to the air pressure detection module 20, i.e., the air pressure detection module 20 is in an operative state, capable of detecting real-time air pressure information within the battery pack and thereby determining whether the battery pack is at risk of thermal runaway.

[0052] Optional, Figure 2 A schematic structural diagram of a visible light wide spectrum demodulation unit provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the visible light wide spectrum demodulation unit 101 includes: a first filter amplifier 1011, n first photodiodes 1012 and n first switches 1013; wherein n ≥ 2, and n is an integer; the cathodes of the n first photodiodes 1012 are all electrically connected to the first static current control module, the anode of the i-th first photodiode 1012 is electrically connected to the first end of the i-th first switch 1013, and the second ends of the n first switches 1013 are all electrically connected to the input end of the first filter amplifier 1011; the output end OUT of the first filter amplifier 1011 is electrically connected to the control module; wherein 1 ≤ i ≤ n, and i is an integer.

[0053] Specifically, the n first photodiodes 1012 are PD1, PD2 to PDn, and the n first switches 1013 are S1, S2 to Sn. The n first photodiodes 1012 have different spectral sensitivities, and the first photodiodes 1012 are electrically connected to the first switches 1013 in a one-to-one correspondence. The cathodes of the n first photodiodes 1012 are electrically connected to the first static current control module 50 for receiving the input signal of the first static current control module 50, the anode of each first photodiode 1012 is electrically connected to the first end of its corresponding first switch 1013, the second ends of the n first switches 1013 are electrically connected to the input end of the first filter amplifier 1011, and the output end OUT of the first filter amplifier 1011 is electrically connected to the control module. In this way, when the visible light inside the battery pack is detected, the first first switch S1 to the nth first switch Sn are turned on in sequence, that is, the first filter amplifier 1011 controls the first first photodiode. When PD1 is sampled, the first first switch S1 is turned on, and then the first first switch S1 is turned off. When the second first photodiode PD2 is sampled, the second first switch S2 is turned on, and then the second first switch S2 is turned off, and so on, until the nth first photodiode PDn is sampled, the nth first switch Sn is turned on, and then the nth first switch Sn is turned off. In this way, the initial analog signal is output to the input end of the first filter amplifier 1011. The first filter amplifier 1011 filters and amplifies the initial analog signal and obtains real-time visible light information, which is output to the control module so that the control module can analyze the real-time visible light information.

[0054] It should be noted that the output end of the first filter amplifier 1011 can also be electrically connected to the digital-to-analog conversion module, so that the digital-to-analog conversion module can convert the analog signal output by the first filter amplifier 1011 into a data signal so that the control module can analyze the digital signal.

[0055] Optional, Figure 3 A schematic diagram of the structure of an infrared wide spectrum demodulation unit provided by an embodiment of the present utility model is shown as follows: Figure 3 As shown, the infrared wide spectrum demodulation unit 102 includes: a second filter amplifier 1021, k second photodiodes 1022 and k second switches 1023; wherein, k ≥ 2, and k is an integer; the cathodes of the k second photodiodes 1022 are all electrically connected to the first static current control module 50, the anode of the j-th second photodiode 1022 is electrically connected to the first end of the j-th second switch 1023, and the second ends of the k second switches 1023 are all electrically connected to the input end of the second filter amplifier 1021; the output end OUT of the second filter amplifier 1021 is electrically connected to the control module; wherein, 1 ≤ j ≤ k, and j is an integer.

[0056] Specifically, the k second photodiodes 1022 are PD1, PD2 to PDk respectively, and the k second switches 1023 are S1, S2 to Sk respectively. The k second photodiodes 1022 are different in spectral sensitivity, and the optical parameters of the second photodiodes 1022 are different from those of the first photodiodes in the visible light wide spectrum demodulation unit. The second photodiodes 1022 are used for detecting infrared light, and the first photodiodes are used for detecting visible light. The second photodiodes 1022 are electrically connected to the second switches 1023 in one-to-one correspondence. The cathodes of the k second photodiodes 1022 are electrically connected to the first static current control module 50, and are used for receiving the input signal of the first static current control module 50. The anode of each second photodiode 1022 is electrically connected to the first end of the corresponding second switch 1022, the second ends of the k second switches 1023 are electrically connected to the input end of the second filter amplifier 1021, and the output end OUT of the second filter amplifier 1021 is electrically connected to the control module. When detecting the infrared light inside the battery pack, the first second switch S1 to the kth second switch Sk are sequentially turned on, that is, when the second filter amplifier 1021 samples the first second photodiode PD1, the first second switch S1 is turned on, then the first second switch S1 is turned off, the second second photodiode PD2 is sampled, the second second switch S2 is turned on, then the second second switch S2 is turned off, and so on, until the kth second photodiode PDk is sampled, the kth second switch Sk is turned on, then the kth second switch Sk is turned off. Thus, the initial analog signal is output to the input end of the second filter amplifier 1021, and the real-time infrared light information obtained by the second filter amplifier 1021 after filtering and amplifying the initial analog signal is output to the control module, so that the control module analyzes the real-time infrared light information.

[0057] It should be noted that the output end of the second filter amplifier 1021 can also be electrically connected to a digital-to-analog conversion module. Thus, the analog signal output by the second filter amplifier 1021 can be converted into a digital signal by the digital-to-analog conversion module, so that the control module analyzes the digital signal.

[0058] Optionally, Figure 4 A structure diagram of the air pressure detection module provided by the embodiment of the present application is shown in the figure, Figure 4As shown, the air pressure detection module 20 comprises: a first positive voltage resistor R1, a second positive voltage resistor R3, a first negative voltage resistor R4, a second negative voltage resistor R2 and a third filter amplifier 201; the first end of the first positive voltage resistor R1 is electrically connected with the first end of the first negative voltage resistor R4 and the second static current control module 60 respectively; the second end of the first positive voltage resistor R1 is electrically connected with the first end of the second negative voltage resistor R2 and the first input end VIN of the third filter amplifier 201 respectively; the second end of the second negative voltage resistor R2 is electrically connected with the first end of the second positive voltage resistor R3 and the ground end GND respectively; the second end of the second positive voltage resistor R3 is electrically connected with the second end of the first negative voltage resistor R4 and the second input end VIP of the third filter amplifier 201 respectively; the output end OUT of the third filter amplifier 201 is electrically connected with the control module.

[0059] Specifically, by adopting the bridge circuit composed of two positive voltage resistors and two negative voltage resistors, when the air pressure inside the battery pack is large, the signal between the first input end VIN and the second input end VIP of the third filter amplifier 201 is large; when the air pressure inside the battery pack is small, the signal between the first input end VIN and the second input end VIP of the third filter amplifier 201 is small. The signal input to the third filter amplifier 201 is output to the control module by the output end OUT after being filtered and amplified by the third filter amplifier 201, so that the control module analyzes the real-time air pressure information.

[0060] Optionally, continuing to refer to Figure 1 , the thermal runaway detection device further comprises: an alarm module 70; the alarm module 70 is electrically connected with the control module 30, and is used for outputting an alarm signal according to the thermal runaway detection result information output by the control module 30.

[0061] Specifically, when the control module 30 determines whether the battery pack is in a thermal runaway state, the control module 30 outputs the thermal runaway detection result information to the alarm module 70, and the alarm module 70 warns the user to timely repair or escape to prevent casualties.

[0062] It can be understood that the alarm signal output by the alarm module 70 can be a sound alarm signal or a light alarm signal, etc.

[0063] Optionally, continuing to refer to Figure 1 , the thermal runaway detection device further comprises: a communication module 80; the communication module 80 is communicatively connected with the control module 30 and a terminal device (not shown in the figure) respectively, and the control module 30 is used for sending the thermal runaway detection result information to the terminal device through the communication module 80.

[0064] Specifically, the control module 30 can send the thermal runaway detection result to the terminal device through the communication module 80 so that the user can view it, thereby realizing visualization of the thermal runaway detection result.

[0065] Optional, Figure 5 This is a top view of a thermal runaway detection device provided by an embodiment of the present invention. Figure 6 This is a side view schematic diagram of a thermal runaway detection device provided by an embodiment of the present invention, and further reference is made to Figure 1 、 Figure 5 and Figure 6 As shown, the thermal runaway detection device further includes: a housing 90 ; the optical detection module 10 , the air pressure detection module 20 and the control module 30 are all located in the housing 90 .

[0066] Specifically, the optical detection module 10, the air pressure detection module 20 and the control module 30 are all located in the shell 90. This can realize the integrated setting of the thermal runaway detection device on the one hand, and on the other hand, it is beneficial to protect the performance of the internal components of the thermal runaway detection device through the shell 90.

[0067] It should be noted that the thermal runaway detection device may further include a printed circuit board group 100 , and the optical detection module 10 and the air pressure detection module 20 may be welded on the printed circuit board group 100 , so that the printed circuit board group 100 can serve as a hardware carrier to realize the integrated setting of the detection components.

[0068] Optional, continue to refer to Figure 5 and Figure 6 The housing 90 includes an end cover 901 and a main body shell 902 ; the end cover 901 is located on a side of the main body shell 902 close to the main contacts of the battery pack.

[0069] Specifically, the main contacts of the battery pack can be understood as locations in the battery pack that are prone to heat generation.

[0070] Specifically, the end cover 901 may adopt a transparent snap-fit ​​structure, and the main body shell 902 may adopt a snap-fit ​​structure, for bearing the printed circuit board assembly and external installation torque.

[0071] Optional, continue to refer to Figure 5 and Figure 6 The end cover 901 includes a light-guiding cover. When thermal runaway occurs, a "flash arc" will appear inside the battery pack. In this way, light will be transmitted to the optical detection module through the light-guiding cover so that the optical detection module can detect the light, which is conducive to achieving "panoramic transparency" and capturing thermal runaway light information over a large range.

[0072] It is understood that the material of the end cap 901 can be a car-grade material that is resistant to high temperature, vibration, humidity, and corrosion. For example, the material of the end cap 901 can be the same material as the car headlight.

[0073] In summary, the thermal runaway detection device provided by the embodiment of the present invention detects real-time visible light information inside the battery pack through a visible light wide-spectrum demodulation unit, detects real-time infrared light information inside the battery pack through an infrared wide-spectrum demodulation unit, and detects real-time air pressure information inside the battery pack through an air pressure detection module. The control module determines whether the battery pack is in a thermal runaway state based on the real-time visible light information, real-time infrared light information and real-time air pressure information. In this way, optical detection and air pressure detection can be combined, which is conducive to ensuring the reliability of the detection results and realizing the protection of the high-voltage battery pack.

[0074] The above specific embodiments do not limit the scope of protection of this utility model. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the scope of protection of this utility model.

Claims

1. A thermal runaway detection device, characterized in that: include: Optical detection module, air pressure detection module and control module; The optical detection module includes a visible light wide spectrum demodulation unit and an infrared wide spectrum demodulation unit; The visible light wide spectrum demodulation unit and the infrared wide spectrum demodulation unit are both electrically connected to the control module; the visible light wide spectrum demodulation unit is used to detect real-time visible light information inside the battery pack and send the real-time visible light information to the control module; the infrared wide spectrum demodulation unit is used to detect real-time infrared light information inside the battery pack and send the real-time infrared light information to the control module; The air pressure detection module is electrically connected to the control module and is used to detect real-time air pressure information inside the battery pack and send the air pressure information to the control module; The control module is configured to determine whether the battery pack is in a thermal runaway state based on the real-time visible light information, the real-time infrared light information, and the real-time air pressure information.

2. The thermal runaway detection device according to claim 1, characterized in that: The thermal runaway detection device further includes: a power management module, a first quiescent current control module, and a second quiescent current control module; The power management module is electrically connected to the first quiescent current control module and the second quiescent current control module, respectively, and is used to supply power to the first quiescent current control module and the second quiescent current control module; The first static current control module is electrically connected to the visible light wide spectrum demodulation unit and the infrared wide spectrum demodulation unit respectively, and is used to control the working states of the visible light wide spectrum demodulation unit and the infrared wide spectrum demodulation unit; The second static current control module is electrically connected to the air pressure detection module and is used to control the working state of the air pressure detection module.

3. The thermal runaway detection device according to claim 2, characterized in that: The visible light wide spectrum demodulation unit includes: a first filter amplifier, n first photodiodes and n first switches; wherein n≥2, and n is an integer; The cathodes of the n first photodiodes are all electrically connected to the first static current control module, the anode of the i-th first photodiode is electrically connected to the first end of the i-th first switch, and the second ends of the n first switches are all electrically connected to the input end of the first filter amplifier; and the output end of the first filter amplifier is electrically connected to the control module; Wherein, 1≤i≤n, and i is an integer.

4. The thermal runaway detection device according to claim 2, characterized in that: The infrared wide spectrum demodulation unit includes: a second filter amplifier, k second photodiodes and k second switches; wherein k≥2, and k is an integer; The cathodes of k second photodiodes are electrically connected to the first static current control module, the anode of the jth second photodiode is electrically connected to the first end of the jth second switch, and the second ends of k second switches are electrically connected to the input end of the second filter amplifier; and the output end of the second filter amplifier is electrically connected to the control module; Wherein, 1≤j≤k, and j is an integer.

5. The thermal runaway detection device according to claim 2, characterized in that: The air pressure detection module includes: a first positive pressure resistor, a second positive pressure resistor, a first negative pressure resistor, a second negative pressure resistor and a third filter amplifier; The first end of the first positive voltage resistor is electrically connected to the first end of the first negative voltage resistor and the second static current control module respectively; the second end of the first positive voltage resistor is electrically connected to the first end of the second negative voltage resistor and the first input end of the third filter amplifier respectively; the second end of the second negative voltage resistor is electrically connected to the first end of the second positive voltage resistor and the ground end respectively; the second end of the second positive voltage resistor is electrically connected to the second end of the first negative voltage resistor and the second input end of the third filter amplifier respectively; and the output end of the third filter amplifier is electrically connected to the control module.

6. The thermal runaway detection device according to claim 1, characterized in that: The thermal runaway detection device further includes: an alarm module; The alarm module is electrically connected to the control module and is used to issue an alarm signal according to the thermal runaway detection result information output by the control module.

7. The thermal runaway detection device according to claim 1, characterized in that: The thermal runaway detection device further includes: a communication module; The communication module is communicatively connected to the control module and the terminal device respectively, and the control module is used to send thermal runaway detection result information to the terminal device through the communication module.

8. The thermal runaway detection device according to claim 1, characterized in that: The thermal runaway detection device further includes: a housing; The optical detection module, the air pressure detection module and the control module are all located in the housing.

9. The thermal runaway detection device according to claim 8, characterized in that: The housing comprises: an end cover and a main body shell; The end cover is located on a side of the main body shell close to the main contact of the battery pack.

10. The thermal runaway detection device according to claim 9, characterized in that: The end cover includes a light guide cover.

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