Heating film dry burning protection method, device, equipment, medium and system

Abstract

The application provides a heating film dry burning protection method, device, equipment, medium and system, and relates to the technical field of heating film; the method comprises the following steps: inputting a preset input signal into an equivalent circuit model of a heating film, and acquiring electrical signal information output by the equivalent circuit model currently; model parameters of the equivalent circuit model change with the dry burning state of the heating film; performing a target operation according to the electrical signal information; the target operation comprises at least one of the following operations: acquiring the electrical signal information output by the equivalent circuit model currently again, outputting a warning signal corresponding to the electrical signal information, and performing a warning action corresponding to the electrical signal information. Through the application, the warning effect can be effectively improved, and the dry burning protection effect is improved.

Description

Technical Field

[0001] This application relates to heating film technology, and more particularly to a method, apparatus, equipment, medium, and system for protecting a heating film from dry burning. Background Technology

[0002] Heating films, as a highly efficient electrothermal element, are widely used in domestic heating and industrial heating due to their uniform heating and rapid response. However, heating films are prone to dry burning when there is a lack of heat dissipation medium (such as lack of water or no load), which leads to a sharp rise in temperature. This can not only damage the heating film itself but also cause safety accidents such as insulation aging and fires, posing a serious threat to safety in use.

[0003] In known technologies, there are two main ways to prevent heating films from burning out: one is to directly detect the surface temperature of the heating film using a temperature sensor and cut off the power when the temperature exceeds a threshold; the other is to monitor the resistance change of the heating film (using the characteristic that resistance increases with temperature) to indirectly determine whether there is a risk of burning out and trigger protection.

[0004] However, in the above process, temperature sensors are easily affected by installation location and heat conduction lag, and resistance monitoring is easily affected by power fluctuations and contact resistance interference, which may lead to delayed or false alarms for dry burning, resulting in untimely safety protection. Summary of the Invention

[0005] This application provides a method, device, equipment, medium, and system for preventing dry burning of heating films, which can provide accurate and timely early warning to avoid the danger caused by dry burning of heating films and improve safety.

[0006] In a first aspect, this application provides a method for protecting a heating film from dry burning, the method comprising:

[0007] A preset input signal is input into the equivalent circuit model of the heating film, and the electrical signal information currently output by the equivalent circuit model is obtained; the model parameters of the equivalent circuit model change with the dry burning state of the heating film.

[0008] Based on the electrical signal information, perform the target operation; the target operation includes at least one of the following operations: reacquire the electrical signal information currently output by the equivalent circuit model, output the warning signal corresponding to the electrical signal information, and perform the warning action corresponding to the electrical signal information.

[0009] In one possible implementation, performing the target operation based on the electrical signal information includes:

[0010] When the electrical signal information meets the first warning condition, a target operation is performed, including outputting the first warning signal corresponding to the electrical signal information and / or performing the first warning action corresponding to the electrical signal information.

[0011] When the electrical signal information does not meet the first warning condition, the process includes obtaining the electrical signal information currently output by the equivalent circuit model again.

[0012] In one possible implementation, the electrical signal information includes the amplitude and / or rate of change of the output voltage signal of the equivalent circuit model; the first warning condition includes: the amplitude is lower than a preset reference amplitude, and / or the rate of change is lower than a preset reference rate of change.

[0013] In one possible implementation, obtaining the electrical signal information currently output by the equivalent circuit model includes:

[0014] The preset input signal is input into the dynamic response equation corresponding to the equivalent circuit model to obtain the output voltage signal corresponding to the equivalent circuit model;

[0015] The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0016] In one possible implementation, the model parameters are bound to the physical properties of the heating film, the model parameters including resistance parameters, and the physical properties including the actual resistance of the heating film; the resistance parameters correspond to the actual resistance, and when the heating film is dry-burned, causing the temperature to rise, the actual resistance increases and the resistance parameters increase simultaneously.

[0017] In one possible implementation, the equivalent circuit model is an RC circuit model, where R corresponds to the actual resistance of the heating film and C corresponds to the thermal inertia characteristic of the heating film. The thermal inertia characteristic is reflected in the hysteresis of heat accumulation and release of the heating film. When the heating film is dry-burning, the heat accumulation process affects the dynamic response of the RC circuit model.

[0018] In one possible implementation, obtaining the electrical signal information currently output by the equivalent circuit model includes:

[0019] The preset input signal is input into the differential equation corresponding to the RC circuit model to obtain the output voltage signal corresponding to the RC circuit model.

[0020] The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0021] In one possible implementation, the preset input signal is a periodic signal, and the period is adapted to the changes in the physical properties of the heating film.

[0022] In one possible implementation, the method further includes:

[0023] Under preset reference conditions, the preset input signal is input into the equivalent circuit model, and the reference output voltage output by the equivalent circuit model is obtained;

[0024] The preset reference amplitude and / or preset reference change rate are determined based on the reference output voltage.

[0025] In one possible implementation, determining the preset reference amplitude and / or preset reference change rate based on the reference output voltage includes:

[0026] A reference amplitude is determined based on the reference output voltage, and the reference amplitude is multiplied by a first preset value to obtain the preset reference amplitude; the first preset value is a positive number less than 1.

[0027] And / or, determine the reference change rate based on the reference output voltage, and multiply the reference change rate by a second preset value to obtain the preset reference change rate; the second preset value is a positive number less than 1.

[0028] In one possible implementation, the first preset value and the second preset value are dynamically adjusted based on ambient temperature and / or usage duration.

[0029] In one possible implementation, an alloy film is adhered to the surface of the heating film, the melting point of the alloy film being lower than that of the heating film; the method further includes:

[0030] Monitor the melting state of the alloy film;

[0031] When the alloy film is in a melt-out state, perform at least one of the following operations: output a second warning signal, or perform a second warning operation.

[0032] In one possible implementation, the alloy film connection status monitoring circuit; the monitoring of the melting status of the alloy film includes:

[0033] The melting state of the alloy film is monitored by monitoring the on / off state of the circuit of the status monitoring circuit; when the alloy film melts, the circuit of the status monitoring circuit is disconnected.

[0034] In one possible implementation, the second warning operation is to physically cut off the power supply to the heating film.

[0035] Secondly, this application provides a heating film dry-burn protection device, the device comprising:

[0036] The acquisition module is used to input a preset input signal into the equivalent circuit model of the heating film and acquire the electrical signal information currently output by the equivalent circuit model; the model parameters of the equivalent circuit model change with the dry burning state of the heating film.

[0037] The control module is used to perform a target operation based on the electrical signal information; the target operation includes at least one of the following operations: reacquiring the electrical signal information currently output by the equivalent circuit model, outputting a warning signal corresponding to the electrical signal information, and performing a warning action corresponding to the electrical signal information.

[0038] Thirdly, this application provides an electronic device, including a processor and a memory communicatively connected to the processor;

[0039] The memory stores computer-executed instructions;

[0040] The processor executes computer execution instructions stored in the memory to implement the method as described in any of the first aspects.

[0041] Fourthly, this application provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any of the first aspects.

[0042] Fifthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the method as described in any of the first aspects.

[0043] In a sixth aspect, this application provides a heating film dry-burn protection system, the system comprising an electronic device as described in the third aspect, and a sensing device; the electronic device is used to implement the method as described in any of the first aspects, and the sensing device is used to collect the dry-burn state of the heating film so that the electronic device can determine the model parameters of the equivalent circuit model.

[0044] In a seventh aspect, this application provides a battery pack including the heating film dry-burn protection system as described in the sixth aspect.

[0045] Eighthly, this application provides a vehicle that includes the heating film dry-burn protection system as described in the sixth aspect.

[0046] This application provides a method, apparatus, device, medium, and system for preventing dry burning of a heating film. Specifically, the method first inputs a preset input signal into the equivalent circuit model of the heating film and obtains the current output electrical signal information of the equivalent circuit model. Then, based on the electrical signal information, it determines whether to obtain the current output electrical signal information again or to output a warning signal and / or a warning action. In this process, since the model parameters of the equivalent circuit model are directly bound to the physical characteristics (such as actual resistance) of the heating film, and these physical characteristics change in real time with the dry burning state, the electrical signal information can synchronously reflect this change. This allows for accurate capture of the state changes after dry burning of the heating film and timely triggering of warning or protective actions, thereby helping to prevent the continued development of dry burning leading to excessively high temperatures, heating film damage, fire, and other dangers, thus improving safety. Attached Figure Description

[0047] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0048] Figure 1 This is an application scenario diagram of a heating film dry-burn protection method provided in an embodiment of this application;

[0049] Figure 2 A flowchart illustrating a heating film dry-burn protection method provided in this application embodiment. Figure 1 ;

[0050] Figure 3A A flowchart illustrating a heating film dry-burn protection method provided in this application embodiment. Figure 2 ;

[0051] Figure 3B An equivalent circuit model of a heating film provided in this application embodiment;

[0052] Figure 3C A schematic diagram of the principle of a heating film dry-burn protection method provided in this application embodiment. Figure 1 ;

[0053] Figure 4A A schematic flowchart (3) illustrates a method for protecting a heating film from dry burning, as provided in an embodiment of this application.

[0054] Figure 4B A schematic diagram of the principle of a heating film dry-burn protection method provided in this application embodiment. Figure 2 ;

[0055] Figure 5 This is a schematic diagram of the structure of a heating film dry-burn protection device provided in an embodiment of this application;

[0056] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0057] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0058] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0059] A heating film is a component that generates heat through Joule heating by the flow of electric current through a conductive material. Due to its advantages such as uniform heating, high thermal efficiency, and thin and lightweight structure, it is widely used in household water heaters, heating equipment, and industrial heating devices. However, during use, if the heating area lacks sufficient heat dissipation medium (such as when the water heater tank is dry), the heating film may enter a dry-burning state because the heat cannot be dissipated in time. Dry burning causes the heating film temperature to rise rapidly in a short period of time, which not only accelerates the aging of the heating film and shortens its lifespan, but may also ignite surrounding flammable materials, causing fires and other safety accidents, posing a serious threat to personal and property safety.

[0060] Currently known technologies for preventing heating films from dry-burning mainly fall into two categories: one type directly monitors the temperature of the heating film or its surrounding environment using temperature sensors (such as thermocouples or thermistors), triggering an alarm or power-off protection when the temperature exceeds a preset threshold; the other type utilizes the characteristic of the heating film's resistance changing with temperature, indirectly judging the temperature state by monitoring changes in its resistance value, and activating protective measures when the resistance abnormally increases to a certain extent. In addition, some solutions employ mechanical temperature controllers, relying on the deformation of a bimetallic strip due to heat to trigger a power-off, achieving basic overheat protection.

[0061] In the above process, when the temperature sensor directly monitors, the installation gap between the sensor and the heating film and the heat conduction efficiency will affect the real-time performance of temperature acquisition, which may easily lead to monitoring lag and failure to detect dry burning in time in the early stage. When monitoring indirectly through resistance, the resistance change of the heating film may also be affected by factors such as power supply voltage fluctuations and contact resistance changes, which may lead to misjudgment, misinterpreting normal resistance fluctuations as dry burning, or failing to identify abnormal resistance due to interference during dry burning.

[0062] It should be understood that these accuracy issues make it difficult for known technologies to accurately capture temperature changes at the initial stage of dry burning. This can either trigger protection prematurely, affecting normal use, or delay protection, making it impossible to effectively avoid the risk of dry burning, thus posing significant safety hazards.

[0063] Therefore, this application provides a method, apparatus, device, medium, and system for protecting a heating film from dry burning, to solve the aforementioned problems. Specifically, the heating film dry burning protection method in this application is executed by any electronic device. The electronic device inputs a preset input signal into the equivalent circuit model of the heating film and obtains the electrical signal information currently output by the equivalent circuit model. Further, based on the electrical signal information, a corresponding target operation is performed.

[0064] It is understood that the method of this application is applicable to any scenario requiring dry-burn protection of the heating film, for example, Figure 1 This is an application scenario diagram of a heating film dry-burn protection method provided in an embodiment of this application, such as... Figure 1 As shown, the method of this application can be used for dry burning protection of the heating film in the battery pack, such as the safety control of the heating film when the battery pack is heated at low temperature, which is specifically executed by the battery management unit of the battery pack.

[0065] Specifically, in battery pack scenarios, heating films are used to heat batteries in low-temperature environments to ensure charging and discharging performance. If heat dissipation is poor during heating (such as increased internal thermal resistance of the battery pack), the heating film is prone to dry burning and may lead to battery thermal runaway. This application uses an equivalent circuit model to monitor the changes in the resistance and thermal inertia of the heating film in real time. Combined with the physical protection of alloy film melting, it can accurately warn and cut off heating in the early stages of dry burning risk, thus avoiding battery pack safety accidents.

[0066] It is understood that the method of this application can be executed not only by an electronic device, but also directly by the battery management unit of the battery pack, or by any other electronic device such as a user's mobile phone; this embodiment does not limit this. Besides battery pack applications, the method of this application can also be applied to household water heaters, vehicle heating devices, industrial drying equipment, and other scenarios; this embodiment also does not limit this.

[0067] The following detailed description, with reference to the accompanying drawings and using an electronic device as the implementing entity, outlines some embodiments of the heating film dry-burn protection method of this application. Where the embodiments do not conflict, the following embodiments and features thereof can be combined with each other.

[0068] This application provides a method for protecting a heating film from dry burning. Figure 2 A flowchart illustrating a heating film dry-burn protection method provided in this application embodiment. Figure 1 ,like Figure 2As shown in the embodiments of this application, a method for protecting a heating film from dry burning includes the following:

[0069] S201, input the preset input signal into the equivalent circuit model of the heating film, and obtain the electrical signal information currently output by the equivalent circuit model.

[0070] Among them, the model parameters of the equivalent circuit model change with the dry burning state of the heating film.

[0071] In this embodiment, the electronic device is equipped with a preset input signal, which is a test signal with known characteristics, used to excite the equivalent circuit model and obtain its response characteristics. Specifically, the preset input signal can be a step signal, a sine wave signal, or a pulse sequence signal, etc.; among them, the step signal can test the transient response of the circuit to infer thermal inertia parameters, the sine wave signal can identify impedance changes through frequency sweep analysis, and the pulse sequence signal can extract temperature-related parameters through attenuation characteristics. Moreover, the signal amplitude, frequency, and duration need to be adapted to the characteristics of the heating film to avoid interfering with normal heating.

[0072] In this embodiment, when the electronic device inputs a preset input signal into the equivalent circuit model, it acquires the real-time value of the output voltage signal or output current signal output by the equivalent circuit model, and then obtains electrical signal information based on this. In this embodiment, the electrical signal information includes the amplitude and / or frequency of the output voltage signal of the equivalent circuit model, specifically obtained from the output voltage signal output by the equivalent circuit model in response to the preset input signal. The amplitude reflects the real-time temperature or resistance change state of the heating film, and the frequency reflects the rate of temperature change or thermal inertia characteristics of the heating film.

[0073] In this embodiment, the model parameters are bound to the physical properties of the heating film. The model parameters include resistance parameters, and the physical properties include the actual resistance of the heating film. The resistance parameters correspond to the actual resistance. When the heating film is dry-burned, causing the temperature to rise, the actual resistance increases and the resistance parameters increase simultaneously.

[0074] For example, the equivalent circuit model can be any equivalent circuit model that includes resistance parameters, such as an RC circuit model, an RLC circuit model, or a thermal resistance-capacitance network model. Specifically, in the RC circuit model, R corresponds to the actual resistance of the heating film, and C corresponds to the thermal inertia characteristics of the heating film; in the RLC circuit model, R corresponds to the actual resistance of the heating film, which increases with temperature, L corresponds to the electromagnetic induction effect when the heating film current changes (such as the skin effect under high-frequency current), and C corresponds to the distributed capacitance or thermal inertia of the heating film and its surrounding environment; in the thermal resistance-capacitance network model, it specifically includes a network composed of multiple resistors and capacitors, such as the internal thermal resistance of the heating film material, the contact thermal resistance between the heating film and the heat dissipation medium, the heat capacity of the heating film itself, and the heat capacity of the heat dissipation medium. Correspondingly, there is a functional relationship between the thermal resistance and the actual resistance of the heating film. When dry-burning, the temperature increases, leading to an increase in thermal resistance, and the heat capacity reflects the material's ability to store heat.

[0075] It should be understood that this embodiment does not limit the specific form of the equivalent circuit model, as long as it includes resistance parameters. In practical applications, an appropriate equivalent circuit model can be selected based on the application scenario of the heating film and the monitoring accuracy requirements.

[0076] It should be understood that in this embodiment, the electronic device needs to acquire real-time state information reflecting the dry-burning state of the heating film and dynamically update the model parameters of the equivalent circuit model based on this state information. Specifically, the electronic device interacts with sensing devices (such as current sensors and voltage sensors) to acquire real-time current and / or voltage signals of the heating film. These signals are raw data reflecting the physical characteristics of the heating film (such as resistance changes). Based on this raw data (e.g., calculating resistance using Ohm's law or inferring capacitance using dynamic response equations), the electronic device determines the parameters in the equivalent circuit model that are tied to the physical characteristics (such as resistance parameter R and capacitance parameter C), thereby completing the update of the model parameters.

[0077] In the aforementioned process, by incorporating resistance parameters into the equivalent circuit model, this scheme achieves a direct correlation between electrical signals and physical characteristics. Specifically, it utilizes the real-time mapping of resistance parameters to the actual resistance of the heating film, combined with the dual dimensions of output voltage amplitude reflecting temperature changes and frequency characterizing thermal inertia, thus enabling the monitoring of dry-burning conditions to possess both physical interpretability and quantitative accuracy. This design avoids the "black box" defects of traditional purely data-driven methods and provides a theoretical basis for setting warning thresholds through the physical meaning of circuit parameters, significantly improving the reliability of early dry-burning identification.

[0078] S202, execute the target operation based on the electrical signal information.

[0079] The target operation includes at least one of the following operations: reacquiring the current output electrical signal information of the equivalent circuit model, outputting the warning signal corresponding to the electrical signal information, and executing the warning action corresponding to the electrical signal information.

[0080] In this embodiment, the electronic device is configured with a first warning condition. The electronic device combines the first warning condition and electrical signal information to perform a target operation. Specifically, when the electrical signal information meets the first warning condition, the target operation includes outputting a first warning signal corresponding to the electrical signal information and / or performing a first warning action corresponding to the electrical signal information. When the electrical signal information does not meet the first warning condition, the target operation includes re-acquiring the electrical signal information currently output by the equivalent circuit model.

[0081] More specifically, the first warning conditions include: the amplitude is lower than the preset reference amplitude, and / or the rate of change is lower than the preset reference rate of change.

[0082] As a preferred example, the electrical signal information includes the amplitude and rate of change of the output voltage signal. Based on this, the electronic device compares the current amplitude with a preset reference amplitude and the current rate of change with a preset reference rate of change. The specific comparison logic is as follows: if the real-time amplitude is lower than the preset reference amplitude, the amplitude trigger condition in the first warning condition is determined to be met; if the real-time rate of change is lower than the preset reference rate of change, the rate of change trigger condition in the first warning condition is determined to be met; as long as one condition is met (or both conditions are met simultaneously, set according to actual protection requirements), the first warning signal and / or the first warning action will be executed; if neither condition is met, the current electrical signal information is determined to be within the normal range, and the next electrical signal information acquisition process is immediately initiated.

[0083] In this embodiment, the intensity of the first warning signal and the first warning action are related to the degree of abnormality of the electrical signal information. In practical applications, the intensity of the first warning signal and the first warning action can be adjusted in stages according to the actual values ​​of the preset reference amplitude and the preset reference change rate (such as setting multi-level reference thresholds); and / or, the corresponding intensity of the first warning signal and the first warning action can be dynamically output according to the current electrical signal information (such as the difference between the amplitude and the reference, or the magnitude of the change rate being lower than the reference).

[0084] In this embodiment, the first warning signal is used to alert the user that the heating film may have a potential risk of dry burning or abnormal operating status. The specific form of the warning can be designed according to the application scenario. For example, in a vehicle battery pack scenario, a text message "Heating film status abnormal" can be displayed on the vehicle's screen, or an indicator light on the dashboard can flash (such as a yellow warning light). In an industrial equipment scenario, a buzzer warning sound can be emitted through the control terminal, while a log record is generated in the background system. These warnings allow users or maintenance personnel to quickly become aware of early abnormalities in the heating film, providing clear guidance for manual troubleshooting (such as checking whether the heat dissipation channels are blocked or whether the heating circuit has poor contact).

[0085] The first warning action focuses on proactive intervention to reduce risk. For example, depending on the severity of the anomaly, it may involve actions such as "reducing heating power by 10%-30%" (mild anomaly), "pausing heating for 30 seconds and then restarting" (moderate anomaly), or "temporarily cutting off the power supply to the heating circuit" (severe anomaly). This combination of "signal prompts + action intervention" enables both "human-assisted monitoring" through the first warning signal and "automatic system protection" through the first warning action, forming a dual response in the early stages of dry-burning risk and preventing the risk from escalating further.

[0086] Understandably, in the above process, the electronic device determines the target operation to be performed based on the first warning condition. This target operation can be determined through simple comparison logic, ensuring the ease of implementation. Furthermore, when the electrical signal information does not meet the first warning condition, the electronic device performs the target operation of acquiring the electrical signal information again, ensuring continuous monitoring of the equivalent circuit model output, i.e., continuous monitoring of the heating film.

[0087] Furthermore, by breaking down electrical signal information into two dimensions—amplitude and rate of change—and comparing them with corresponding preset benchmarks, a warning signal or action is triggered when either condition is met, and the signal is immediately reacquired when neither condition is met. This design not only utilizes a dual-dimensional judgment logic—amplitude reflecting the absolute change in resistance (temperature) and rate of change capturing trend changes—to achieve sensitive identification of early dry-burning characteristics, but also avoids missing dry-burning signals through a real-time loop mechanism of "continuous monitoring when conditions are not met." At the same time, the "selectable output of warning signals and actions" mode allows for flexible adjustment of response intensity according to the degree of risk. While ensuring timely early identification of dry-burning, it balances the effectiveness of protection with ease of use, reducing the risk of missed or false alarms caused by a single monitoring dimension or delayed response.

[0088] As a preferred example, the preset input signal is a periodic signal, and the period is adapted to the changes in the physical properties of the heating film. Based on this setting, the electronic device can complete a complete "input-response" monitoring within each signal cycle, ensuring that no characteristic changes in the early stage of dry burning are missed through periodic sampling; at the same time, the regularity of the periodic signal makes it easier for the system to distinguish between valid signals and interference signals. For example, it can focus only on the signal component that matches the rhythm of the heating film temperature change, and judge the dry burning state by its amplitude change, thus ensuring the continuity of monitoring and improving the anti-interference capability.

[0089] In practical applications, the preset input signal can also be a single pulse signal, which is suitable for scenarios with high response speed requirements. The transient characteristics of the heating film can be quickly obtained through a single signal excitation. Alternatively, it can be a fixed-frequency sine wave signal, which is suitable for scenarios that require long-term stable monitoring. By continuously acquiring the amplitude and phase changes of the signal, subtle changes in characteristics caused by dry burning can be captured.

[0090] In the method provided in this embodiment, a correlation between a preset input signal and the physical properties of the heating film is established through an equivalent circuit model. Electrical signal information is used as a monitoring carrier for the dry burning state. Then, in combination with the target operation, a closed-loop protection of "signal acquisition - state judgment - response execution" is achieved.

[0091] The method described in this embodiment can convert the dry-burning state of the heating film into quantifiable electrical signal information, and ensure the reliability of monitoring by leveraging the physical correlation of the equivalent circuit model. Simultaneously, the continuous monitoring mechanism of "reacquiring the signal" combined with the intervention mechanism of "early warning signal / action" not only achieves dynamic capture of early dry-burning conditions but also enables timely response when risks arise, effectively reducing safety hazards caused by dry-burning. Furthermore, the overall process, based on circuit model and signal comparison, has the advantages of being easy to implement and low-cost.

[0092] This application also provides a method embodiment for detailing how to acquire electrical signal information. Figure 3A A flowchart illustrating a heating film dry-burn protection method provided in this application embodiment. Figure 2 ,like Figure 3A As shown, the method in this embodiment includes:

[0093] S301, input the preset input signal into the dynamic response equation corresponding to the equivalent circuit model to obtain the output voltage signal corresponding to the equivalent circuit model.

[0094] S302, determine electrical signal information based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0095] In this embodiment, after the heating film is modeled as an equivalent circuit model, its voltage response when a preset input signal is applied is described by a dynamic response equation. Specifically, Figure 3B An equivalent circuit model of a heating film provided in the embodiments of this application is as follows: Figure 3B As shown, in this embodiment, the equivalent circuit model is an RC circuit model, where R corresponds to the actual resistance of the heating film and C corresponds to the thermal inertia characteristics of the heating film. The thermal inertia characteristics are reflected in the hysteresis of heat accumulation and release of the heating film. When the heating film is dry-burning, the heat accumulation process affects the dynamic response of the RC circuit model.

[0096] Based on this, the electronic device inputs the preset input signal into the differential equation corresponding to the RC circuit model to obtain the output voltage signal corresponding to the RC circuit model; further, it determines the electrical signal information based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0097] In this embodiment, by binding the resistance (R) of the RC circuit model to the actual resistance of the heating film and associating the resistance (C) with the thermal inertia characteristics, the dual physical characteristics of the dry-burning process are simulated: R directly reflects the core change of increased resistance caused by dry-burning, while C reflects the hysteresis effect of heat accumulation and release, fully reproducing the dynamic process of "temperature rise → resistance change → heat conduction delay" during dry-burning. This model design, through the precise correspondence between physical parameters and circuit parameters, not only improves the comprehensiveness of dry-burning state monitoring but also captures subtle changes in resistance with dry-burning through dynamic response analysis. Especially in the initial stage of dry-burning, it can identify risks in advance through the characteristics of changes in the amplitude and rate of change of the output voltage, effectively shortening the trigger time of warning or protective actions and reducing the safety risks caused by continuous dry-burning.

[0098] Next, based on the above, the principle of performing corresponding target operations based on electrical signal information containing amplitude and rate of change will be explained. Specifically, if the preset input signal is represented as... The voltage feedback signal across the capacitor, i.e., the output voltage signal, is expressed as: Let the resistance of the heating film be R and the capacitance be C. Then, when the electronic device receives a preset input signal, the voltage response of the RC circuit model is described by the following differential equation: .

[0099] It should be understood that the physical meaning of this differential equation lies in relating the physical characteristics of the heating film (resistance R, capacitance C corresponding to thermal inertia) to the dynamic changes of the electrical signal through circuit theory. When the preset input signal is a PWM signal (period T = 1 / f, duty cycle D, high level V),... peak When the equation is in operation (conduction charging or deactivation discharging), the solution will exhibit different transient responses depending on the operating phase. For example, during the conduction phase (V... o =V peak The solution is V(t) = V peak (1-e -t / (RC)), shutdown phase (V o The solution for (=0) is V(t) = V peak e -(t-DT) / (RC) Both of these responses are directly affected by R and C, especially R, which is a parameter tied to the actual resistance of the heating film; its change will directly alter the dynamic characteristics of the output voltage.

[0100] As can be seen from the above, when the heating film burns dry, causing the resistance R to increase, the characteristic change in the output voltage signal can be quantitatively represented by the solution of the equation. Specifically, the initial charging slope (dV / dt| t=0 =V peak / RC) decreases, rise time (determined by τ=RC) increases; initial discharge slope (dV / dt| t=DT =-V peak The absolute value of / RC decreases, and the discharge time increases; and the maximum amplitude (V) decreases. max =V peak (1-e -DT / (RC) The resistance of the heating film decreases as R increases. These changing patterns provide a clear basis for extracting electrical signal information (amplitude and rate of change). By monitoring the slope and amplitude of the output voltage, the change in the heating film resistance R can be inferred, thereby determining whether it is in a dry-burning state, and providing mathematical derivation support for setting subsequent early warning conditions.

[0101] As a verification, Figure 3C A schematic diagram of the principle of a heating film dry-burn protection method provided in this application embodiment. Figure 1 The figure shows the relevant waveforms for system response comparison (sampling rate 100kHz). More specifically, the figure shows the voltage changes over time under normal and dry-burning conditions. Figure 3C As shown, the verification is as follows, based on specific parameters: The preset input signal is set to a square wave signal with a frequency of 1kHz and an amplitude of 5V; the resistance R of the heating film during normal operation... normal =100Ω, in the equivalent circuit model, the capacitance C = 1 × 10⁻⁶ -6 F; The heating film is made of copper (temperature coefficient of resistance α = 0.0039). When dry burning causes a temperature rise ΔT = 100℃, the resistance under dry burning conditions can be calculated using the formula: R dry =100×(1+0.0039×100)=139Ω.

[0102] Based on the above parameters, the time constant (τ=RC) of the RC circuit under normal conditions is 100Ω×1×10. -6 F=0.1ms, and in dry-burning condition, it is 139Ω×1×10. -6 F = 0.139 ms; corresponding cutoff frequency (f c=1 / (2πτ)) is approximately 1.59kHz under normal conditions and approximately 1.14kHz under dry burning conditions.

[0103] from Figure 3C It can be visually observed that the frequency of the input square wave (1kHz) is close to the cutoff frequency under dry-burning conditions (1.14kHz) but lower than the cutoff frequency under normal conditions (1.59kHz). This results in less attenuation of the square wave signal after passing through the RC circuit under normal conditions; however, under dry-burning conditions, the signal attenuation increases significantly, specifically manifested as a decrease in the amplitude of the output voltage and smoother changes in the edges (rising and falling edges), which is consistent with theoretical calculations. Therefore, by monitoring the amplitude and rate of change of the electrical signal output by the equivalent circuit, the dry-burning state of the heating film can be accurately captured.

[0104] Based on this, the electronic device is configured with a first warning condition. The preset reference amplitude and / or preset reference change rate indicated by the first warning condition configured in the electronic device are also obtained based on the equivalent circuit model of the heating film. Specifically, under the preset reference condition, the electronic device inputs a preset input signal into the equivalent circuit model and obtains the reference output voltage output by the equivalent circuit model; the preset reference amplitude and / or preset reference change rate are determined based on the reference output voltage.

[0105] In this embodiment, the preset reference conditions specifically refer to the heating film being in normal working condition (without dry burning) and the ambient temperature being a standard reference temperature (e.g., 25°C). Under these conditions, the electronic device inputs a preset input signal (e.g., a 1kHz square wave) into the equivalent circuit model, and the obtained reference output voltage reflects the standard electrical characteristics of the heating film. Specifically, this includes using a nominal value for the heating film resistance R (e.g., 100Ω in the example) to eliminate the effects of temperature fluctuations and aging; keeping parameters such as ambient temperature and humidity constant to avoid external factors interfering with the electrical signal characteristics; and ensuring that parameters such as the amplitude, frequency, and duty cycle of the preset input signal are completely consistent with those during actual monitoring to ensure the comparability of the reference value and the real-time value.

[0106] As a preferred design, in this embodiment, a reference amplitude is determined based on the reference output voltage, and the reference amplitude is multiplied by a first preset value to obtain a preset reference amplitude; the first preset value is a positive number less than 1; and / or, a reference change rate is determined based on the reference output voltage, and the reference change rate is multiplied by a second preset value to obtain a preset reference change rate; the second preset value is a positive number less than 1.

[0107] In this embodiment, the specific values ​​of the first preset value and the second preset value can be determined based on the safe operating threshold of the heating film, the risk level of dry burning, and the actual application scenario. For example, if it is necessary to improve the sensitivity of early warning, the first preset value can be set to 0.9 (i.e., the preset reference amplitude is 90% of the reference amplitude) and the second preset value can be set to 0.85 (i.e., the preset reference change rate is 85% of the reference change rate); if it is necessary to reduce the false alarm rate, the first preset value can be set to 0.7 and the second preset value can be set to 0.6, and the timeliness and reliability of the warning can be balanced by adjusting the threshold redundancy.

[0108] By employing the setting logic of "reference output voltage → reference characteristics → preset reference (reference characteristics × preset value)," the first warning condition is deeply bound to the inherent characteristics of the heating film (represented by an equivalent circuit model), avoiding subjective setting of the preset reference. Simultaneously, the adjustability of the first and second preset values ​​allows the warning condition to adapt to the material characteristics of different heating films (such as differences in resistance temperature coefficient) and the safety requirements of different application scenarios (such as differences in risk tolerance between household and industrial scenarios), further enhancing the versatility and practicality of the solution.

[0109] As a further optimized design, the first and second preset values ​​are dynamically adjusted based on ambient temperature and / or usage time. Specifically, the electronic device has a pre-stored mapping table between the first and second preset values ​​and ambient temperature and usage time; this mapping table is calibrated based on the physical property changes of the heating film under different ambient temperatures (such as the nonlinear characteristics of the temperature coefficient of resistance) and the aging characteristics caused by usage time (such as resistance drift caused by material fatigue). For example, when the ambient temperature rises, the basic resistance value of the heating film increases. At this time, the first preset value is dynamically increased through the mapping table (e.g., adjusted from 0.9 to 0.95) to compensate for the influence of ambient temperature on the reference amplitude; when the usage time exceeds a preset threshold (e.g., 500 hours), material aging causes a change in the temperature coefficient of resistance. At this time, the second preset value is dynamically decreased (e.g., adjusted from 0.85 to 0.8) to improve the sensitivity to the rate of change.

[0110] Based on this setting, the warning conditions can adapt to system errors caused by ambient temperature fluctuations and material aging, avoiding false alarms due to rising ambient temperature (although the reference amplitude drops even though the heating element is not actually dry-burning, triggering a warning) or missed alarms due to material aging (the rate of change decreases during dry-burning, but the preset reference is not adjusted), further improving the accuracy of dry-burning monitoring and the long-term stability of the system. Meanwhile, the dynamic adjustment mechanism requires no additional hardware costs; it can adapt to the aging characteristics of different heating film models simply by updating the mapping table through software, enhancing the engineering practicality of the solution.

[0111] In practical applications, the methods for obtaining and adjusting the preset reference amplitude and preset reference change rate can be flexibly selected, and this embodiment does not limit them. For example, they can be directly adopted from empirical values ​​summarized from long-term use of similar heating films; or the amplitude and change rate calculated from the output voltage signal when the heating film is working normally can be directly used as the reference values; in terms of adjustment logic, it is possible to choose not to perform dynamic adjustment and keep the reference value fixed; or only the preset reference amplitude can be dynamically adjusted (such as according to ambient temperature compensation), while the preset reference change rate remains fixed, or vice versa, only the preset reference change rate can be adjusted. As long as the dry burning state can be identified by comparing the preset reference amplitude and / or preset reference change rate with real-time electrical signal information, it falls within the protection scope of this embodiment.

[0112] In practical applications, other dynamic response expressions can be used to replace differential equations. This embodiment does not limit this, as long as the expression can accurately reflect the functional relationship between the heating film resistance R and the characteristics of the output voltage signal (such as amplitude, slope, and time constant), and the parameters in the expression can be calibrated through experimental data or physical models to ensure that the characteristic change law of the output voltage signal is consistent with the derivation result of the differential equation when the resistance changes due to dry burning of the heating film, that is, the dry burning state can be effectively identified by monitoring electrical signal information.

[0113] In the method provided in this embodiment, the physical characteristics of the heating film are abstracted into parameters of an equivalent circuit model (e.g., R corresponds to resistance and C corresponds to thermal inertia), and a mathematical relationship between the input signal and the output voltage is established based on the dynamic response equation, thereby realizing a quantitative mapping from physical phenomena to electrical signal characteristics.

[0114] The method in this embodiment can accurately capture minute changes in the resistance of the heating film by monitoring the amplitude and rate of change of the output voltage signal, thereby identifying potential dry-burning hazards in advance and providing a real-time and reliable safety protection mechanism for heating equipment, effectively reducing safety risks caused by dry-burning.

[0115] This application also provides a method embodiment for detailing how to further achieve protection of the heating film. In this embodiment, an alloy film is adhered to the surface of the heating film, and the melting point of the alloy film is lower than that of the heating film. Specifically, in this embodiment, the heating film and the alloy film are bonded together with adhesive and polyimide. Based on this, Figure 4A A schematic flowchart three illustrates a method for protecting a heating film from dry burning, as provided in an embodiment of this application. Figure 4A As shown, the method in this embodiment includes:

[0116] S401 monitors the melting state of the alloy film.

[0117] S402, when the alloy film is in a melted state, perform at least one of the following operations: output a second warning signal, or perform a second warning operation.

[0118] In this embodiment, the alloy film is a low-melting-point alloy compared to the heating film, which can be a bismuth-based low-melting-point alloy (such as bismuth-lead-tin alloy, bismuth-indium alloy, bismuth-tin alloy), a lead-based low-melting-point alloy (lead-tin alloy, lead-antimony alloy), a tin-based low-melting-point alloy (tin-lead alloy, tin-silver-copper alloy), or a cadmium-based low-melting-point alloy (cadmium-bismuth alloy, cadmium-indium alloy).

[0119] Specifically, the alloy film and the heating film adopt a tightly bonded layered structure, with the alloy film directly covering the surface of the heating film. This ensures that the heat from the heating film can be quickly conducted to the alloy film, keeping the temperature change of the alloy film highly synchronized with the actual temperature of the heating film. Structurally, the heating film and the alloy film each have independent connectors led out via metal wires: the connector for the heating film connects to the heating film circuit in the distribution box; the connector for the alloy film connects to the electronic equipment of this application, which monitors the on / off status of the alloy film in real time, providing signal input for subsequent fuse detection. This bonded design ensures timely temperature conduction and achieves functional division through independent connectors, ensuring that heating control and fuse monitoring do not interfere with each other.

[0120] In this embodiment, the alloy film is connected to a status monitoring circuit. Based on this, the electronic device monitors the melting state of the alloy film by monitoring the on / off state of the status monitoring circuit. When the alloy film melts, the circuit of the status monitoring circuit is disconnected.

[0121] Specifically, Figure 4B A schematic diagram of the principle of a heating film dry-burn protection method provided in this application embodiment. Figure 2 ,like Figure 4B As shown, the status monitoring circuit includes a circuit formed by a power supply, a current-limiting resistor, and an alloy film connected in series. The electronic device determines the on / off state of the alloy film by detecting the voltage or current signal of this circuit. Specifically, when the alloy film has not melted, the circuit is in a conducting state, and the voltage signal detected by the electronic device is the voltage division across the current-limiting resistor (or the current signal is the normal operating current of the circuit). When the heating film burns dry, causing the temperature to exceed the melting point of the alloy film, the alloy film melts, the monitoring circuit is disconnected, and the voltage signal detected by the electronic device becomes the power supply voltage (or the current signal becomes 0). Through this "on → off" signal change, the electronic device can accurately identify the melting state of the alloy film, providing a clear triggering basis for "outputting the second warning signal" and "executing the second warning operation" (such as cutting off the power supply to the main circuit of the heating film) in S402.

[0122] In the above process, the status of the alloy film is monitored through a monitoring circuit, enabling secondary protection against the risk of dry burning with a simple and reliable structure. The monitoring circuit consists only of a power supply, a current-limiting resistor, and the alloy film connected in series, eliminating the need for complex components. This not only reduces hardware costs but also minimizes potential failure points and improves long-term stability. The electronic device, as the monitoring unit, can directly determine the status of the alloy film by detecting changes in voltage or current in the detection circuit. When the film is not melted, the electronic device detects a stable electrical signal; when it melts, the electrical signal exhibits a significant jump, such as the voltage changing to the power supply voltage or the current becoming zero. This signal change is intuitive and easily identifiable, allowing the electronic device to respond quickly without complex algorithms, ensuring real-time capture of the melted state.

[0123] Meanwhile, this monitoring method complements the previous electrical signal monitoring of electronic devices. When electrical signal monitoring fails to provide timely warnings due to interference or malfunction, the physical melting of the alloy film and the signal feedback from the monitoring circuit can serve as a fallback protection mechanism. Based on this, the electronic device performs operations such as cutting off the heating circuit, further reducing the risk of continued dry burning and making the heating film's protection system more redundant and reliable.

[0124] In this embodiment, the second warning operation is to physically cut off the power supply to the heating film. With this setting, when the alloy film melts due to dry burning, the heating can be immediately terminated by physically cutting off the power supply, preventing the temperature from continuing to rise from the source, avoiding damage to the heating film due to continuous overheating or causing more serious safety hazards, as a direct hardware protection measure against dry burning.

[0125] In this embodiment, the second warning signal is used to convey an emergency notification to the user or related systems that "the alloy film has melted and the risk of dry burning has triggered hardware protection," and its notification intensity is higher than that of the first warning signal. Specifically, in a vehicle scenario, red warning text (such as "Heating film dry burning risk! Melt protection triggered") can be displayed on the vehicle's central control screen, accompanied by a continuous buzzer alarm; in an industrial equipment scenario, in addition to local audible and visual alarms, alarm data including the melting time and location can also be sent to the background monitoring system, facilitating maintenance personnel to quickly locate the fault. Unlike the "tiered notification" of the first warning signal, the second warning signal is usually presented in the form of the highest level of warning, directly and clearly conveying the key information that "physical protection has been activated," ensuring that relevant personnel are aware of and intervene in the matter immediately.

[0126] In practical applications, the temperature surge caused by the melting of the alloy film can also be used to trigger protective actions. For example, a high-precision temperature sensor can be installed near the alloy film. When the alloy film melts, it absorbs heat as it changes from a solid to a liquid state, causing a significant drop in local temperature within a very short time. The temperature sensor can capture this sudden temperature change to determine whether the alloy film has melted. Alternatively, optical detection methods can be used. Temperature-sensitive optical materials can be placed on or near the surface of the alloy film. When the alloy film is normal, the optical material is in an optical state. When the alloy film melts and causes a temperature change, the optical properties of the optical material (such as reflectivity and refractive index) change. The optical detection device can identify this optical change to determine the melting state of the alloy film, thereby triggering a second warning signal and operation.

[0127] The method provided in this embodiment further protects the heating film from dry burning by monitoring the melting state of the alloy film. Specifically, because the melting point of the alloy film is lower than that of the heating film, it will melt before the heating film reaches a dangerous temperature (or just reaches the critical temperature). The change in its melting state (from on to off) is captured by the electronic device through a monitoring circuit. Based on this state change, the electronic device triggers a second warning operation (such as cutting off the power supply), thereby forming a hard protection at the stage where the risk of dry burning has already appeared, preventing the heating film from being damaged or causing a safety accident due to continuous dry burning. This method does not rely on complex signal analysis algorithms; it can achieve a direct response to the dry burning state simply through the physical characteristics of the alloy film and simple on / off monitoring. As a reliable fallback protection method, it effectively supplements the overall protection system against dry burning of the heating film.

[0128] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily essential to this application.

[0129] It should be further noted that although the steps in the flowchart are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0130] The above embodiments introduce a method for protecting a heating film from dry burning from the perspective of process flow. The following embodiments introduce a device for protecting a heating film from dry burning from the perspective of virtual module or virtual unit. For details, please refer to the following embodiments.

[0131] This application also provides a heating film dry-burn protection device for implementing the method described in the above method embodiments. Figure 5 This is a schematic diagram of the structure of a heating film dry-burning protection device provided in an embodiment of this application, as shown below. Figure 5 As shown, in this embodiment, the heating film dry-burn protection device may include:

[0132] The acquisition module 51 is used to input a preset input signal into the equivalent circuit model of the heating film and acquire the electrical signal information currently output by the equivalent circuit model; the model parameters of the equivalent circuit model change with the dry burning state of the heating film.

[0133] The control module 52 is used to perform a target operation based on the electrical signal information. The target operation includes at least one of the following operations: reacquiring the electrical signal information currently output by the equivalent circuit model, outputting a warning signal corresponding to the electrical signal information, and performing a warning action corresponding to the electrical signal information.

[0134] In one possible implementation of this application embodiment, the control module 52 is specifically used for:

[0135] When the electrical signal information meets the first warning condition, the target operation is executed, including outputting the first warning signal corresponding to the electrical signal information and / or executing the first warning action corresponding to the electrical signal information.

[0136] When the electrical signal information does not meet the first warning condition, the process includes re-acquiring the electrical signal information currently output by the equivalent circuit model.

[0137] In one possible implementation of this application, the electrical signal information includes the amplitude and / or rate of change of the output voltage signal of the equivalent circuit model; the first warning condition includes: the amplitude is lower than a preset reference amplitude, and / or the rate of change is lower than a preset reference rate of change.

[0138] In one possible implementation of this application embodiment, the acquisition module 51 is specifically used for:

[0139] The preset input signal is input into the dynamic response equation corresponding to the equivalent circuit model to obtain the output voltage signal corresponding to the equivalent circuit model.

[0140] The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0141] In one possible implementation of this application, the model parameters are bound to the physical characteristics of the heating film. The model parameters include resistance parameters, and the physical characteristics include the actual resistance of the heating film. The resistance parameters correspond to the actual resistance. When the heating film is dry-burned and the temperature rises, the actual resistance increases and the resistance parameters increase simultaneously.

[0142] In one possible implementation of this application, the equivalent circuit model is an RC circuit model, where R corresponds to the actual resistance of the heating film and C corresponds to the thermal inertia characteristics of the heating film. The thermal inertia characteristics are reflected in the hysteresis of heat accumulation and release of the heating film. When the heating film is dry-burned, the heat accumulation process affects the dynamic response of the RC circuit model.

[0143] In one possible implementation of this application embodiment, the acquisition module 51 is specifically used for:

[0144] Input the preset input signal into the differential equation corresponding to the RC circuit model to obtain the output voltage signal corresponding to the RC circuit model;

[0145] The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

[0146] In one possible implementation of this application, the preset input signal is a periodic signal, and the period is adapted to the changes in the physical properties of the heating film.

[0147] In one possible implementation of this application embodiment, the control module 52 is further configured to:

[0148] Under preset reference conditions, a preset input signal is input into the equivalent circuit model, and the reference output voltage output by the equivalent circuit model is obtained.

[0149] The preset reference amplitude and / or preset reference change rate are determined based on the reference output voltage.

[0150] In one possible implementation of this application embodiment, the control module 52 is specifically used for:

[0151] The reference amplitude is determined based on the reference output voltage, and the reference amplitude is multiplied by a first preset value to obtain a preset reference amplitude; the first preset value is a positive number less than 1.

[0152] And / or, determine the reference change rate based on the reference output voltage, and multiply the reference change rate by a second preset value to obtain a preset reference change rate; the second preset value is a positive number less than 1.

[0153] In one possible implementation of this application, the first preset value and the second preset value are dynamically adjusted according to the ambient temperature and / or usage duration.

[0154] In one possible implementation of this application embodiment, an alloy film is adhered to the surface of the heating film, and the melting point of the alloy film is lower than that of the heating film; the control module 52 is further configured to:

[0155] Monitor the melting state of the alloy film;

[0156] When the alloy film is in a melt-out state, perform at least one of the following operations: output a second warning signal, or perform a second warning operation.

[0157] In one possible implementation of this application embodiment, the alloy film connection status monitoring circuit; the control module 52 is specifically used for:

[0158] The melting state of the alloy film is monitored by monitoring the on / off state of the state monitoring circuit; when the alloy film melts, the circuit of the state monitoring circuit is disconnected.

[0159] In one possible implementation of this application embodiment, the second warning operation is: physically cutting off the power supply to the heating film.

[0160] It should be understood that the above-described device embodiments are merely illustrative, and the device of this application can also be implemented in other ways. For example, the division of units / modules in the above embodiments is only a logical functional division, and there may be other division methods in actual implementation. For example, multiple units, modules, or components may be combined, or integrated into another system, or some features may be ignored or not executed.

[0161] This application provides an electronic device. Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application, such as... Figure 6 As shown, Figure 6The illustrated electronic device includes a processor 61 and a memory 62. The processor 61 and the memory 62 are connected, for example, via a bus 63. Optionally, the electronic device may also include a transceiver 64. It should be noted that in practical applications, the transceiver 64 is not limited to one type, and the structure of this electronic device does not constitute a limitation on the embodiments of this application.

[0162] Processor 61 may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 61 may also be a combination that implements computational functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0163] Bus 63 may include a pathway for transmitting information between the aforementioned components. Bus 63 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Bus 63 may be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 6 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0164] The memory 62 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0165] The memory 62 is used to store application code that executes the solution of this application, and its execution is controlled by the processor 61. The processor 61 is used to execute the application code stored in the memory 62 to implement the content shown in the foregoing method embodiments.

[0166] This application also provides a computer-readable storage medium, which may include various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk. Specifically, the computer-readable storage medium stores program instructions, which are used to implement the service message processing methods in the above embodiments.

[0167] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the technical solution of the above method embodiments. Its implementation principle and technical effects are similar, and will not be repeated here.

[0168] This application embodiment also provides a heating film dry burning protection system, the system including the above-mentioned electronic device and a sensing device; the electronic device is used to implement the aforementioned heating film dry burning protection method, and the sensing device is used to collect the heating film dry burning state so that the electronic device can determine the model parameters of the equivalent circuit model.

[0169] In one possible implementation, the heating film dry-burn protection system also includes an alloy film adhered to the surface of the heating film; the melting point of the alloy film is lower than that of the heating film.

[0170] This application embodiment also provides a battery pack, which includes the above-mentioned heating film dry burning protection system.

[0171] This application also provides a vehicle that includes the aforementioned heating film dry-burn protection system.

[0172] In the above embodiments, the descriptions of each embodiment have their own emphasis. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments. The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0173] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0174] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A method for protecting a heating film from dry burning, characterized in that, The method includes: A preset input signal is input into the equivalent circuit model of the heating film, and the electrical signal information currently output by the equivalent circuit model is obtained; the model parameters of the equivalent circuit model change with the dry burning state of the heating film. Based on the electrical signal information, perform the target operation; the target operation includes at least one of the following operations: reacquire the electrical signal information currently output by the equivalent circuit model, output the warning signal corresponding to the electrical signal information, and perform the warning action corresponding to the electrical signal information.

2. The method according to claim 1, characterized in that, The step of performing the target operation based on the electrical signal information includes: When the electrical signal information meets the first warning condition, a target operation is performed, including outputting the first warning signal corresponding to the electrical signal information and / or performing the first warning action corresponding to the electrical signal information. When the electrical signal information does not meet the first warning condition, the process includes obtaining the electrical signal information currently output by the equivalent circuit model again.

3. The method according to claim 2, characterized in that, The electrical signal information includes the amplitude and / or rate of change of the output voltage signal of the equivalent circuit model; the first warning condition includes: the amplitude is lower than a preset reference amplitude, and / or the rate of change is lower than a preset reference rate of change.

4. The method according to any one of claims 1-3, characterized in that, The step of obtaining the electrical signal information currently output by the equivalent circuit model includes: The preset input signal is input into the dynamic response equation corresponding to the equivalent circuit model to obtain the output voltage signal corresponding to the equivalent circuit model; The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

5. The method according to any one of claims 1-3, characterized in that, The model parameters are bound to the physical properties of the heating film. The model parameters include resistance parameters, and the physical properties include the actual resistance of the heating film. The resistance parameters correspond to the actual resistance. When the heating film is dry-burned, causing the temperature to rise, the actual resistance increases and the resistance parameters increase simultaneously.

6. The method according to any one of claims 1-3, characterized in that, The equivalent circuit model is an RC circuit model, where R corresponds to the actual resistance of the heating film and C corresponds to the thermal inertia characteristics of the heating film. The thermal inertia characteristics are reflected in the hysteresis of heat accumulation and release of the heating film. When the heating film is dry-burned, the heat accumulation process affects the dynamic response of the RC circuit model.

7. The method according to claim 6, characterized in that, The step of obtaining the electrical signal information currently output by the equivalent circuit model includes: The preset input signal is input into the differential equation corresponding to the RC circuit model to obtain the output voltage signal corresponding to the RC circuit model. The electrical signal information is determined based on the output voltage signal; the electrical signal information includes the amplitude and / or rate of change of the output voltage signal.

8. The method according to any one of claims 1-3, characterized in that, The preset input signal is a periodic signal, and the period is adapted to the changes in the physical properties of the heating film.

9. The method according to any one of claims 1-3, characterized in that, The method further includes: Under preset reference conditions, the preset input signal is input into the equivalent circuit model, and the reference output voltage output by the equivalent circuit model is obtained; The preset reference amplitude and / or preset reference change rate are determined based on the reference output voltage.

10. The method according to claim 9, characterized in that, The step of determining the preset reference amplitude and / or preset reference change rate based on the reference output voltage includes: A reference amplitude is determined based on the reference output voltage, and the reference amplitude is multiplied by a first preset value to obtain the preset reference amplitude; the first preset value is a positive number less than 1. And / or, determine the reference change rate based on the reference output voltage, and multiply the reference change rate by a second preset value to obtain the preset reference change rate; the second preset value is a positive number less than 1.

11. The method according to claim 10, characterized in that, The first preset value and the second preset value are dynamically adjusted according to the ambient temperature and / or usage time.

12. The method according to any one of claims 1-3, characterized in that, An alloy film is adhered to the surface of the heating film, the melting point of which is lower than that of the heating film; the method further includes: Monitor the melting state of the alloy film; When the alloy film is in a melt-out state, perform at least one of the following operations: output a second warning signal, or perform a second warning operation.

13. The method according to claim 12, characterized in that, The alloy film connection status monitoring circuit; the monitoring of the melting status of the alloy film includes: The melting state of the alloy film is monitored by monitoring the on / off state of the circuit of the status monitoring circuit; when the alloy film melts, the circuit of the status monitoring circuit is disconnected.

14. The method according to claim 12, characterized in that, The second warning operation is to physically cut off the power supply to the heating film.

15. A heating film dry-burn protection device, characterized in that, The device includes: The acquisition module is used to input a preset input signal into the equivalent circuit model of the heating film and acquire the electrical signal information currently output by the equivalent circuit model; the model parameters of the equivalent circuit model change with the dry burning state of the heating film. The control module is used to perform a target operation based on the electrical signal information; the target operation includes at least one of the following operations: reacquiring the electrical signal information currently output by the equivalent circuit model, outputting a warning signal corresponding to the electrical signal information, and performing a warning action corresponding to the electrical signal information.

16. An electronic device, characterized in that, The electronic device includes a processor and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1 to 14.

17. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1 to 14.

18. A computer program product, characterized in that, Includes a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 14.

19. A heating film dry-burn protection system, characterized in that, The system includes the electronic device as described in claim 16, and a sensing device; the electronic device is used to implement the method as described in any one of claims 1-14, and the sensing device is used to collect the dry-burning state of the heating film so that the electronic device can determine the model parameters of the equivalent circuit model.

20. The system according to claim 19, characterized in that, The system also includes an alloy film adhered to the surface of the heating film; the melting point of the alloy film is lower than that of the heating film.

21. A battery pack, characterized in that, The battery pack includes the heating film dry-burn protection system as described in claim 19.

22. A vehicle, characterized in that, The vehicle includes the heating film dry-burn protection system as described in claim 19.

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