Aviation lithium battery thermal runaway detection method and system

Abstract

The invention relates to the technical field of aviation lithium battery thermal runaway detection, in particular to an aviation lithium battery thermal runaway detection method and system. According to the method, environment information and battery information are comprehensively detected, multi-level threshold values are set, and multi-parameter triggering conditions are combined, so that accurate graded early warning and alarming of the thermal runaway process of the aviation lithium battery are realized; wherein the battery temperature threshold value is dynamically and adaptively adjusted according to the environment temperature, the environment pressure and the battery discharge power; the expansion force threshold value of the battery is dynamically and adaptively adjusted according to short-time changes of the environment temperature, the environment pressure and the surface temperature of the battery, so that the scientificity and the reliability of a logic mechanism are ensured and improved. The problem that the thermal runaway of the aviation lithium battery cannot be effectively warned by the existing method is solved.

Description

Technical Field

[0001] This invention relates to the field of thermal runaway detection technology for aviation lithium batteries, specifically focusing on the development of sensors for thermal runaway detection of aviation lithium batteries suitable for airborne environments. This field is also a key technology for ensuring the safe application of aviation lithium batteries. More specifically, the invention relates to: 1. A method for detecting thermal runaway in aviation lithium batteries; 2. An aviation lithium battery thermal runaway detection system. Background Art

[0002] The safety of airborne lithium batteries is a major factor that hinders the development and application of electric aircraft. Their thermal runaway has the following characteristics: (1) High discharge rates during takeoff and climb, and electrothermal coupling affects the thermal runaway process; (2) In a low-pressure, closed environment, lithium batteries have difficulty dissipating heat, which can easily trigger thermal abuse; (3) The environment is complex, with large temperature and pressure changes, and the thermal runaway characteristics change; (4) The initial signs are not obvious, and the airborne detection system cannot provide early warning; (5) It has the three elements of fire, is prone to fire, and can cause huge casualties and property losses.

[0003] For example, the existing invention patent application (application number: 202311608714.6) discloses a smoke detection system and method for aviation lithium batteries, but the content described therein mainly focuses on smoke detection after thermal runaway of aviation lithium batteries, but does not consider the thermal runaway characteristics in the incubation stage of aviation thermal runaway, and does not achieve early detection.

[0004] For example, the existing invention patent application (application number: 202010950037.6) discloses a multi-sensor testing system and method for detecting thermal runaway of lithium batteries, but its content mainly focuses on the processing method of raw data, but does not consider the impact of the environment in which the aviation lithium battery is located on the thermal runaway data, and the processing method is too single, resulting in poor application effect in aviation lithium batteries.

[0005] In summary, the existing lithium battery thermal runaway detection system and method cannot meet the requirements of early detection and warning of aviation lithium batteries. It is necessary to invent a method and system for early detection of aviation lithium batteries. Summary of the Invention

[0006] Based on this, it is necessary to provide a method and system for detecting thermal runaway of aviation lithium batteries to address the problem that existing methods fail to provide effective warnings for thermal runaway of aviation lithium batteries.

[0007] The present invention is achieved by adopting the following technical solutions:

[0008] In a first aspect, the present invention discloses a method for detecting thermal runaway of an aviation lithium battery, which is used to detect thermal runaway of a target lithium battery in a target aviation battery compartment.

[0009] The method for detecting thermal runaway of aviation lithium batteries includes the following steps:

[0010] Step 1: Obtain the real-time ambient temperature T of the target aviation battery compartment env , Real-time environmental pressure P env , smoke short-term change index dS, dangerous gas real-time index G;

[0011] Get the real-time surface temperature T of the target lithium battery bat , short-term change in surface temperature dT bat , surface real-time expansion force F exp , short-term change of surface expansion force dF exp , real-time discharge power P bat .

[0012] Among them, G is a comprehensive indicator that characterizes the real-time concentration of H2 X1, the real-time concentration of CO X2, and the real-time concentration of VOC X3.

[0013] Step 2: Issue early warning and alarm according to preset rules.

[0014] The preset rules include:

[0015] (1) If the battery temperature and expansion force are both at level I, a pre-explosion warning is triggered.

[0016] (2) If any two of the following conditions occur simultaneously: battery temperature level II, battery expansion force level II, smoke level I, or gas level I, the explosion warning is triggered;

[0017] (3) If the battery is in any two of the following states at the same time: battery temperature state level III, battery expansion force state level III, ambient temperature state level I, smoke state level II, and gas state level II, or if the battery is in any one of the following states at the same time: ambient temperature state level II, smoke state level III, and gas state level III, the explosion alarm will be triggered.

[0018] This method for detecting thermal runaway of an aviation lithium battery implements a method or process according to an embodiment of the present disclosure.

[0019] In a second aspect, the present invention discloses an aviation lithium battery thermal runaway detection system, comprising: an environmental information acquisition component, a battery information acquisition component, and an MCU control unit.

[0020] Environmental information collection component is used to collect T env 、P env , dS, X1, X2, X3; among them, the environmental information collection components include: ambient temperature sensor, ambient pressure sensor, smoke sensor, CO sensor, H2 sensor, VOC sensor.

[0021] The battery information collection component is used to collect Tbat , dT bat 、F exp 、dF exp 、P bat ; Among them, the battery information collection component includes: battery surface temperature sensor, battery expansion force sensor, and battery information sensor.

[0022] The MCU control unit is electrically connected to the environmental information collection component and the battery information collection component, and is used to operate according to the aviation lithium battery thermal runaway detection method disclosed in the first aspect.

[0023] The aviation lithium battery thermal runaway detection system implements the method or process according to the embodiment of the present disclosure.

[0024] In a third aspect, the present invention discloses a computer program product. When executed by a processor, the computer program implements the steps of the method for detecting thermal runaway of an aviation lithium battery disclosed in the first aspect.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention comprehensively detects environmental and battery information, sets multi-level thresholds, and combines them with multi-parameter trigger conditions to achieve precise, graded early warning and alarming of thermal runaway processes in aviation lithium batteries. Specifically, the battery temperature threshold is dynamically and adaptively adjusted based on ambient temperature, ambient pressure, and battery discharge power; and the battery expansion force threshold is dynamically and adaptively adjusted based on short-term changes in ambient temperature, ambient pressure, and battery surface temperature. This ensures and improves the scientific nature and reliability of the logic mechanism.

[0027] 2. The present invention simultaneously provides an aviation lithium battery thermal runaway detection system, which adopts multi-parameter collaborative monitoring to achieve all-round monitoring of battery information and environmental information, providing a more comprehensive data source for the logic mechanism.

[0028] 3. Taking into account the low-pressure environment of aviation, the present invention adopts an active gas collection design of a micro air pump, which effectively solves the problem of slow gas diffusion in a low-pressure environment and significantly improves the response speed and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1This is a flow chart of the method for detecting thermal runaway of an aviation lithium battery provided in Example 1 of the present invention;

[0031] Figure 2 for Figure 1 The logic table of preset rules in ;

[0032] Figure 3 This is a structural diagram of the aviation lithium battery thermal runaway detection system provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments 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 are within the scope of protection of the present invention.

[0034] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component. When a component is considered to be "fixed to" another component, it may be directly fixed to the other component or there may be a central component.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] Example 1

[0037] See Figure 1 , which shows a flow chart of a method for detecting thermal runaway of an aviation lithium battery. First of all, it should be noted that this method is used to detect thermal runaway of a target lithium battery in a target aviation battery compartment.

[0038] Compared with traditional lithium battery out-of-control detection (which generally only examines environmental information - such as smoke, ambient temperature, etc.), the present invention takes battery surface temperature and expansion force into consideration and newly designs relevant judgment logic.

[0039] like Figure 1 As shown, the method for detecting thermal runaway of aviation lithium batteries includes the following steps:

[0040] Step 1: Obtain the real-time ambient temperature T of the target aviation battery compartmentenv , Real-time environmental pressure P env , smoke short-term change index dS, dangerous gas real-time index G;

[0041] Get the real-time surface temperature T of the target lithium battery bat , short-term change in surface temperature dT bat , surface real-time expansion force F exp , short-term change of surface expansion force dF exp , real-time discharge power P bat .

[0042] Step one obtains relevant information from two major aspects - one is environmental information, and the other is battery information. It not only takes into account abnormalities in the target aviation battery compartment, but also abnormalities in the target lithium battery itself, providing a comprehensive data basis for subsequent early warning and alarm judgment.

[0043] It should be noted that G is a comprehensive indicator that represents the real-time H2 concentration X1, the real-time CO concentration X2, and the real-time VOC concentration X3. In other words, G is a gas variable that integrates X1, X2, and X3.

[0044] For G, the specific methods of obtaining it include:

[0045] S1, perform normalization and post-processing on X1~X3 respectively to obtain the normalized H2 real-time concentration X norm,1 , CO real-time concentration X norm,2 , VOC real-time concentration X norm,3 .

[0046] It should be noted that the calculation formula for normalization is:

[0047]

[0048] Where, X min,i Represents X i The lower safety limit of X max,i Represents X i In this embodiment 1, X min,i Take 0ppm; X max,i Take 1000ppm.

[0049] S2, to X norm,1 ~X norm,3 Perform weighted fusion to obtain G.

[0050] in,

[0051] Where, w1~w3 are X norm,1 ~X norm,3 The weight of ; w1+w2+w3=1.

[0052] In this embodiment 1, the following configuration is recommended for w1-w3: w1 = 0.3, w2 = 0.5, w3 = 0.2. This configuration is obtained through optimization of a large amount of experimental data and data training.

[0053] Step 2: Issue early warning and alarm according to preset rules.

[0054] It should be noted that although the preset rules are based on threshold judgment, they take into account the influence of more comprehensive parameters, so the specific division rules are more reasonable and effective.

[0055] According to the rule design, the consequences caused by abnormalities in the target aviation battery compartment and / or target lithium battery include: pre-explosion warning, explosion warning, and explosion alarm.

[0056] Specifically, the preset rules include:

[0057] (1) If the battery temperature state is level I and the battery expansion force state is level I at the same time, a pre-explosion warning will be triggered.

[0058] Among them, the level I battery temperature state is: T reaches the level I battery temperature threshold T bat,I , or dT reaches the level I battery temperature change threshold dT bat,I ;

[0059] The expansion force state of the battery of level I is: F exp Reaching the level I battery expansion force threshold F exp,I , or dF exp Reaching the level I battery expansion force change threshold dF exp,I .

[0060] (2) If the vehicle is in any two of the following states at the same time: Level II battery temperature state, Level II battery expansion force state, Level I smoke state, and Level I gas state, the explosion warning will be triggered.

[0061] Among them, the level II battery temperature state is: T reaches the level II battery temperature threshold T bat,Ⅱ , or dT reaches the level II battery temperature change threshold dT bat,Ⅱ ;

[0062] The expansion force state of the level II battery is: F exp Reaching the level II battery expansion force threshold F exp,Ⅱ , or dF exp Reaching the II level battery expansion force change threshold dF exp,Ⅱ ;

[0063] Level I smoke state: S reaches the level I smoke change threshold dS I ;

[0064] Level I gas status: G reaches the level I gas threshold G I .

[0065] (3) If the battery is in any two of the following states at the same time: battery temperature state level III, battery expansion force state level III, ambient temperature state level I, smoke state level II, and gas state level II, or if the battery is in any one of the following states at the same time: ambient temperature state level II, smoke state level III, and gas state level III, the explosion alarm will be triggered.

[0066] Among them, the level III battery temperature state is: T reaches the level III battery temperature threshold T bat,Ⅲ , or dT reaches the level III battery temperature change threshold dT bat,Ⅲ ;

[0067] The expansion force state of the grade III battery is: F exp Reaching the level III battery expansion force threshold F exp,Ⅲ , or dF exp Reaching the level III battery expansion force change threshold dF exp,Ⅲ ;

[0068] Level I ambient temperature state is: T env Reaching the level I ambient temperature threshold T env,Ⅰ ;

[0069] Level II smoke state: S reaches the level II smoke change threshold dS Ⅱ ;

[0070] Level II gas status: G reaches the level II gas threshold G Ⅱ ;

[0071] Level II ambient temperature state is: T env Reaching the level II ambient temperature threshold T env,Ⅱ ;

[0072] Level III smoke state: S reaches the level III smoke change threshold dS Ⅲ ;

[0073] Level III gas status: G reaches the level III gas threshold G Ⅲ .

[0074] The above rules can be used Figure 2 Of course, if the above preset rules are not met, it means that thermal runaway has not occurred and the lithium battery is normal.

[0075] It should be noted that among the above thresholds:

[0076] T bat,I 、T bat,Ⅱ 、T bat,Ⅲ All are the same as T env 、P env 、Pbat Related adaptive threshold; and meet: T bat,I <T bat,Ⅱ <T bat,Ⅲ .

[0077] F exp,I 、F exp,Ⅱ 、F exp,Ⅲ All are the same as T env 、P env , dT bat Related adaptive threshold; and meet: F exp,I <F exp,Ⅱ <F exp,Ⅲ .

[0078] The rest use fixed thresholds (based on a large amount of experimental data and data training optimization); and meet the following requirements: T env,Ⅰ <T env,Ⅱ ;dS I <dS Ⅱ <dS Ⅲ ; G I <G Ⅱ <G Ⅲ .

[0079] In this embodiment 1, the following configurations are recommended for each threshold:

[0080] 1. T bat,I =0.8T bat,Ⅱ ;T bat,Ⅲ =1.2T bat,Ⅱ ;

[0081] in,

[0082] Where, T base represents the basic temperature threshold (usually 50°C); f(.) represents the temperature correction function; α T , β T , γ T Indicates the parameter weight (usually α T Take 0.4, β T Take 0.3, γ T Take 0.3); α T +β T +γ T =1; k1, k2, k3 represent parameter slope coefficients (obtained through experimental calibration); T ref Indicates the ambient temperature reference value (usually 25°C), P ref Indicates the ambient pressure reference value (usually 1 atm), P max Indicates the maximum discharge power of the target lithium battery (obtained from the nameplate of the target lithium battery).

[0083] Due to T bat,I 、T bat,Ⅱ 、T bat,Ⅲ It is the combination of adaptive thresholds of environmental conditions that makes the above rules more suitable for aviation environments and can improve the use effect.

[0084] 2. dT bat,I =2℃ / s,dT bat,Ⅱ =5℃ / s,dT bat,Ⅲ =10℃ / s.

[0085] 3. F exp,I =0.7F exp,Ⅱ ; F exp,Ⅲ =1.5F exp,Ⅱ ;

[0086] in,

[0087] Where, F base represents the basic threshold of expansion force (usually 200N, which is the compressive strength of the battery shell); g(.) represents the expansion force correction function; α F , β F , γ F Indicates the parameter weight (usually α F Take 0.3, β F Take 0.4, γ F Take 0.3); α F +β F +γ F =1; j1, j2, j3 represent parameter slope coefficients (obtained through experimental calibration); T ref Indicates the ambient temperature reference value (usually 25°C), P ref Indicates the ambient pressure reference value (usually 1 atm), T scale Indicates the value related to the change in ambient temperature. It is related to the battery case material (metal case value: 15-25°C, plastic case value: 5-10°C) and should be determined based on actual conditions.

[0088] 4. dF exp,I =1N / s, dF exp,Ⅱ =2N / s, dF exp,Ⅲ =5N / s.

[0089] 5. T env,Ⅰ =40℃, T env,Ⅱ =60℃.

[0090] 6.dS I =0.1%,dS Ⅱ =1%,dS Ⅲ =10%.

[0091] It should be noted that the transmittance change here is used to characterize dS. Then, [0,dS I ] indicates that a small amount of electrolyte may have evaporated; [dS I ,dS Ⅱ ] indicates that the diaphragm may have carbonized and released particles; [dS Ⅱ ,dS Ⅲ ]Indicates that violent combustion and thick smoke may have occurred.

[0092] 7. G I =0.1G Ⅱ , G Ⅲ =2.3G Ⅱ , G Ⅱ =0.2.

[0093] Example 2

[0094] This embodiment 2 provides an aviation lithium battery thermal runaway detection system, which uses the aviation lithium battery thermal runaway detection method provided in embodiment 1.

[0095] See Figure 3 The aviation lithium battery thermal runaway detection system includes: environmental information acquisition components, battery information acquisition components, and MCU control unit.

[0096] Environmental information collection component is used to collect T env 、P env , dS, X1, X2, X3. Specifically, the environmental information collection component includes: an ambient temperature sensor (collecting T env ), environmental pressure sensor (collecting P env ), smoke sensor (collecting dS), CO sensor (collecting X1), H2 sensor (collecting X2), VOC sensor (collecting X3).

[0097] The above-mentioned environmental information acquisition components can be installed in a dispersed manner in the target aviation battery compartment. Of course, considering the structural design, a smoke chamber can be added to specifically carry out the sensing acquisition of dS, X1, X2, and X3. The smoke chamber is connected to the target aviation battery compartment; the smoke sensor, CO sensor, H2 sensor, and VOC sensor are all arranged in the smoke chamber; and the ambient pressure sensor and ambient temperature sensor are arranged in the target aviation battery compartment. In addition, considering the low-pressure environment of aviation, if the low pressure in the target aviation battery compartment is lower than the standard atmospheric pressure P0, the free diffusion of gas is slow - if no intervention is made, it will cause data acquisition delays. Therefore, a micro air pump can also be added, which is used to generate a pressure sensor at P env When the pressure is lower than the standard atmospheric pressure P0, air is drawn from the target aviation battery compartment to the smoke chamber, thereby accelerating gas diffusion and improving the system response speed.

[0098] The battery information collection component is used to collect Tbat , dT bat 、F exp 、dF exp 、P bat Specifically, the battery information collection component includes: a battery surface temperature sensor (collecting T bat , dT bat )、Battery expansion force sensor (collect F exp 、dF exp ), battery information sensor (collecting P bat ).

[0099] It should be noted that, considering the shape of lithium batteries, it is recommended that the battery surface temperature sensor use a flexible sheet temperature sensor, and the battery expansion force sensor use a thin-film pressure sensor. Both can be attached to the target lithium battery surface for monitoring. Furthermore, the flexible sheet temperature sensor uses CMOS technology for temperature measurement, supports single-bus protocol communication and multi-node networking, and has a built-in non-volatile storage unit and temperature error compensation function, making it very suitable for use in this case scenario.

[0100] The MCU control unit is electrically connected to the environmental information collection component and the battery information collection component, and is configured to operate in accordance with the aviation lithium battery thermal runaway detection method disclosed in Example 1. In other words, the MCU control unit serves as a data processing center and executes preset rules to generate early warnings and alarms.

[0101] Of course, the MCU control unit is also electrically connected to the aircraft's onboard fire-extinguishing system for data exchange. The fire-extinguishing system is used to extinguish fires in the target aircraft battery compartment. Existing dry powder fire extinguishing systems, nitrogen fire extinguishing systems, and other systems can be used. Generally, for aviation safety reasons, it is recommended to connect the MCU control unit and the fire-extinguishing system using the CAN bus protocol. According to the above rules, when a pre-explosion warning or explosion warning is triggered, the fire-extinguishing system begins preparation and does not perform fire-extinguishing actions. When a explosion alarm is triggered, the fire-extinguishing system performs fire-extinguishing actions. This ensures a rapid transition from early warning to emergency response, improving safety.

[0102] Of course, the MCU control unit can also be equipped with a debugging expansion board, which has an OTA interface, WIFI / 4G wireless communication interface, RS485 wired communication interface, CAN expansion interface, and JTAG debugging interface, which can expand more functions for the MCU control unit.

[0103] Example 3

[0104] This embodiment 3 discloses a computer device, including a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, it implements the steps of the aviation lithium battery thermal runaway detection method disclosed in embodiment 1.

[0105] Computer devices may include: mobile terminals and fixed terminals. Examples of the former include mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), and in-vehicle terminals (such as in-vehicle navigation terminals); examples of the latter include digital TVs and desktop computers.

[0106] This embodiment 3 further discloses a readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and executed by a processor, the steps of the aviation lithium battery thermal runaway detection method disclosed in embodiment 1 are executed.

[0107] Among them, the readable storage medium may include but is not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0108] This embodiment 3 further discloses a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the method for detecting thermal runaway of an aviation lithium battery disclosed in embodiment 1 are implemented.

[0109] It should be noted that the computer program for executing the above-mentioned program can be written in one or more programming languages ​​or a combination thereof. Among them, the programming language includes object-oriented programming languages ​​such as Java, Smalltalk, C++, and also includes conventional procedural programming languages ​​such as "C" language or similar programming languages. The above-mentioned computer program can be executed completely on the user's computer, or partially on the user's computer, or partially on the user's computer and partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN).

[0110] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0111] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for detecting thermal runaway of an aviation lithium battery, which is used to detect thermal runaway of a target lithium battery in a target aviation battery compartment; characterized in that: It includes the following steps: Step 1: Obtain the real-time ambient temperature T of the target aviation battery compartment env , Real-time environmental pressure P env , smoke short-term change index dS, dangerous gas real-time index G; Get the real-time surface temperature T of the target lithium battery bat , short-term change in surface temperature dT bat , surface real-time expansion force F exp , short-term change of surface expansion force dF exp , real-time discharge power P bat ; Among them, G is a comprehensive index characterizing the real-time concentration of H2 X1, the real-time concentration of CO X2, and the real-time concentration of VOC X3; Step 2: Issue early warning and alarm according to preset rules; the preset rules include: (1) If the battery temperature and expansion force are both at level I, a pre-explosion warning is triggered. (2) If any two of the following conditions occur simultaneously: battery temperature level II, battery expansion force level II, smoke level I, or gas level I, the explosion warning is triggered; (3) If the battery is in any two of the following states at the same time: battery temperature state level III, battery expansion force state level III, ambient temperature state level I, smoke state level II, and gas state level II, or if the battery is in any one of the following states at the same time: ambient temperature state level II, smoke state level III, and gas state level III, the explosion alarm will be triggered.

2. The method for detecting thermal runaway of an aviation lithium battery according to claim 1, wherein: Level I battery temperature status is: T reaches level I battery temperature threshold T bat,I , or dT reaches the level I battery temperature change threshold dT bat,I ; The expansion force state of the battery of level I is: F exp Reaching the level I battery expansion force threshold F exp,I , or dF exp Reaching the level I battery expansion force change threshold dF exp,I ; The battery temperature status of level II is: T reaches the battery temperature threshold of level II T bat,Ⅱ , or dT reaches the level II battery temperature change threshold dT bat,Ⅱ ; The expansion force state of the level II battery is: F exp Reaching the level II battery expansion force threshold F exp,Ⅱ , or dF exp Reaching the II level battery expansion force change threshold dF exp,Ⅱ ; Level I smoke state: S reaches the level I smoke change threshold dS I ; Level I gas status: G reaches the level I gas threshold G I ; The battery temperature status of level III is: T reaches the battery temperature threshold of level III T bat,Ⅲ , or dT reaches the level III battery temperature change threshold dT bat,Ⅲ ; The expansion force state of the grade III battery is: F exp Reaching the level III battery expansion force threshold F exp,Ⅲ , or dF exp Reaching the level III battery expansion force change threshold dF exp,Ⅲ ; Level I ambient temperature state is: T env Reaching the level I ambient temperature threshold T env,Ⅰ ; Level II smoke state: S reaches the level II smoke change threshold dS Ⅱ ; Level II gas status: G reaches the level II gas threshold G Ⅱ ; Level II ambient temperature state is: T env Reaching the level II ambient temperature threshold T env,Ⅱ ; Level III smoke state: S reaches the level III smoke change threshold dS Ⅲ ; Level III gas status: G reaches the level III gas threshold G Ⅲ ; Among them, T bat,I 、T bat,Ⅱ 、T bat,Ⅲ All are the same as T env 、P env 、P bat Related adaptive thresholds; F exp,I 、F exp,Ⅱ 、F exp,Ⅲ All are the same as T env 、P env , dT bat Related adaptive threshold.

3. The method for detecting thermal runaway of an aviation lithium battery according to claim 2, wherein: T bat,I =0.8T bat,Ⅱ ;T bat,Ⅲ =1.2T bat,Ⅱ ; in, Where, T base represents the temperature basic threshold; f(.) represents the temperature correction function; α T , β T , γ T represents the parameter weight; α T +β T +γ T =1; k1, k2, k3 represent parameter slope coefficients; T ref Indicates the ambient temperature reference value, P ref Indicates the ambient pressure reference value, P max Indicates the maximum discharge power of the target lithium battery; or / and, dT bat,I =2℃ / s,dT bat,Ⅱ =5℃ / s,dT bat,Ⅲ =10℃ / s; or / and, F exp,I =0.7F exp,Ⅱ ; F exp,Ⅲ =1.5F exp,Ⅱ ; in, Where, F base represents the basic threshold of expansion force; g(.) represents the expansion force correction function; α F , β F , γ F represents the parameter weight; α F +β F +γ F =1; j1, j2, j3 represent parameter slope coefficients; T ref Indicates the ambient temperature reference value, P ref Indicates the ambient pressure reference value, T scale Indicates the value related to the change of ambient temperature; or / and, dF exp,I =1N / s, dF exp,Ⅱ =2N / s, dF exp,Ⅲ =5N / s; or / and, T env,Ⅰ =40℃, T env,Ⅱ =60℃; or / and, dS I =0.1%,dS Ⅱ =1%,dS Ⅲ =10%; or / and, G I =0.1G Ⅱ , G Ⅲ =2.3G Ⅱ , G Ⅱ =0.

2.

4. The method for detecting thermal runaway of an aviation lithium battery according to any one of claims 1 to 3, characterized in that: In step 1, the method for obtaining G includes: S1, perform normalization post-processing on X1~X3 respectively to obtain the normalized H2 real-time concentration X norm,1 , CO real-time concentration X norm,2 , VOC real-time concentration X norm,3 ; S2, to X norm,1 ~X norm,3 Perform weighted fusion to obtain G; in, Where, w1~w3 are X norm,1 ~X norm,3 The weight of ; w1+w2+w3=1.

5. An aviation lithium battery thermal runaway detection system, characterized in that: include: Environmental information collection component, which is used to collect T env 、P env , dS, X1, X2, X3; Among them, the environmental information collection components include: ambient temperature sensor, ambient pressure sensor, smoke sensor, CO sensor, H2 sensor, VOC sensor; Battery information collection component, which is used to collect T bat , dT bat 、F exp 、dF exp 、P bat ; Among them, the battery information collection component includes: battery surface temperature sensor, battery expansion force sensor, battery information sensor; as well as An MCU control unit is electrically connected to the environmental information acquisition component and the battery information acquisition component, and is used to operate according to the aviation lithium battery thermal runaway detection method according to any one of claims 1 to 4.

6. The aviation lithium battery thermal runaway detection system according to claim 5, characterized in that: The ambient pressure sensor and ambient temperature sensor are both installed in the target aviation battery compartment; Also includes: The smoke chamber is connected to the target aviation battery compartment; the smoke sensor, CO sensor, H2 sensor, and VOC sensor are all arranged in the smoke chamber.

7. The aviation lithium battery thermal runaway detection system according to claim 6, characterized in that: Also includes: Micro air pump, which is used in P env When the pressure is lower than the standard atmospheric pressure P0, air is drawn from the target aviation battery compartment into the smoke chamber.

8. The aviation lithium battery thermal runaway detection system according to claim 5, characterized in that: The battery surface temperature sensor uses a flexible sheet temperature sensor, which is used to stick to the surface of the target lithium battery; The battery expansion force sensor uses a thin film pressure sensor, which is used to stick to the surface of the target lithium battery.

9. The aviation lithium battery thermal runaway detection system according to claim 5, characterized in that: The MCU control unit is electrically connected to the onboard fire extinguishing system; wherein the fire extinguishing system is used to extinguish fire in the target aviation battery compartment; When the pre-explosion warning or explosion warning is triggered, the fire extinguishing system starts preparation and does not perform fire extinguishing action; When the explosion alarm is triggered, the fire extinguishing system will perform fire extinguishing action.

10. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method for detecting thermal runaway of an aviation lithium battery as claimed in any one of claims 1 to 4 are implemented.

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