A thermal runaway early warning system, method, device and storage medium based on a swarmer battery

Abstract

The application discloses a thermal runaway early warning system, method and device based on a quasi-state battery and a storage medium, and the system comprises a vehicle battery, a quasi-state battery, a vehicle battery controller and a quasi-state battery controller, the vehicle battery is used for providing power for the vehicle, the quasi-state battery is used for simulating the working state of the vehicle battery, and the temperature rising speed of the quasi-state battery is greater than the temperature rising speed of the vehicle battery; the quasi-state battery controller is used for collecting the temperature of the quasi-state battery when the quasi-state battery simulates the working state of the vehicle battery, and sending the collected temperature to the vehicle battery controller; the vehicle battery controller is used for acquiring the temperature of the vehicle battery, comparing the acquired temperature with the temperature sent by the quasi-state battery controller, and judging whether the thermal runaway early warning processing of the vehicle battery is needed. Through implementation of the application, compared with the traditional vehicle battery, the battery cell temperature is simple. Compared with the direct temperature threshold setting mode, the application is more accurate, further reduces the possibility of accidents, and guarantees the safety of the person and property.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a thermal runaway early warning system, method, device, and storage medium based on a biomimetic battery. Background Technology

[0002] Currently, new energy vehicles are powered primarily by battery packs. Due to the large size of the vehicle's battery, accurately measuring the temperature of the cells within the pack is a significant challenge. Thermal runaway of an electric vehicle battery is extremely dangerous. Current methods for detecting thermal runaway involve using sensors to collect temperature data from each cell within the battery pack and comparing the highest temperature recorded to diagnose whether thermal runaway has occurred. However, this data only reflects the surface temperature of the cells and cannot capture the internal temperature information. Measuring only the external temperature is inaccurate because of the significant temperature difference between the inside and outside. Even if methods exist to estimate the internal temperature of cells based on their external temperature, the accuracy is still low. Furthermore, in the event of thermal runaway, the temperature rises instantaneously, potentially causing the battery pack to ignite, jeopardizing the safety of the battery pack and occupants.

[0003] Another method for detecting thermal runaway is to use cloud-based big data early warning. This involves collecting data on the conditions that would lead to thermal runaway and issuing warnings based on historical data, giving occupants time to escape. While this allows passengers and the driver to flee quickly, the vehicle will eventually be destroyed by fire. However, this method, while saving lives, also has other drawbacks: firstly, the annual cost of maintaining the data in the cloud is very high; secondly, it requires low-latency networks and has excessively high requirements for communication speeds.

[0004] As a result, the current thermal runaway handling strategies for electric vehicles are not perfect, and false thermal runaway alarms may occur in some special situations. Furthermore, it is too difficult to collect detailed data from the entire vehicle battery, and the existing system for simulating battery charging and discharging characteristics using circuits is not perfect. Therefore, the means to prevent thermal runaway are becoming increasingly limited or increasing in cost. Summary of the Invention

[0005] In view of this, embodiments of the present invention provide a thermal runaway early warning system, method, device and storage medium based on a biomimetic battery, to solve the technical problem that the thermal runaway early warning in the prior art is imperfect and has false alarms.

[0006] The technical solution proposed in this invention is as follows:

[0007] A first aspect of this invention provides a thermal runaway early warning system based on a mimicry battery, comprising: a vehicle battery, a mimicry battery, a vehicle battery controller, and a mimicry battery controller. The vehicle battery provides power to the vehicle. The mimicry battery simulates the operating state of the vehicle battery, and the temperature rise rate of the mimicry battery is greater than the temperature rise rate of the vehicle battery. The mimicry battery controller collects the temperature of the mimicry battery simulating the operating state of the vehicle battery and sends the collected temperature to the vehicle battery controller. The vehicle battery controller obtains the temperature of the vehicle battery, compares it with the temperature sent by the mimicry battery controller, and determines whether to perform thermal runaway early warning processing on the vehicle battery.

[0008] Optionally, the thermal runaway early warning system based on a mimicry battery further includes: a mapping circuit and a power consumption circuit, wherein the power consumption circuit is connected to the mimicry battery and consumes electrical energy in the mimicry battery; the mimicry battery controller collects a first voltage of the mimicry battery after the power consumption circuit consumes electrical energy; the mapping circuit obtains pulse data of the mimicry battery simulating the operation of the vehicle battery output by the vehicle battery controller, converts the pulse data into voltage data, compares it with the first voltage, and obtains a comparison result; the mimicry battery controller adjusts the connection relationship of the power consumption circuit according to the comparison result, changes the electrical energy consumed by the power consumption circuit, so that the voltage data in the comparison result is consistent with the first voltage.

[0009] Optionally, the mapping circuit includes: a pulse output circuit, an adjustable constant current source voltage circuit, and a comparison circuit; the pulse output circuit is used to output a pulse, wherein the pulse is calculated by the vehicle battery controller based on the second power data collected when the vehicle battery is working and the analog ratio; the adjustable constant current source voltage circuit is connected to the pulse output circuit and is used to output stable voltage data based on the pulse; the comparison circuit is connected to the adjustable constant current source voltage circuit and is used to invert the stable voltage data and compare it with the first voltage, and output the comparison result.

[0010] Optionally, the adjustable constant current source voltage circuit includes: a pulse conversion circuit, a voltage regulator circuit, and a constant current source circuit connected in sequence. The pulse conversion circuit includes a light source and a photoresistor. The light source emits light of different brightness according to the pulse, and the photoresistor outputs a voltage of different magnitude according to the light of different brightness. The voltage regulator circuit includes an operational amplifier and a voltage follower circuit composed of multiple resistors to output a stable voltage. The constant current source circuit includes multiple resistors and two transistors to achieve constant current in the adjustable constant current source voltage circuit.

[0011] Optionally, the power consumption circuit includes multiple resistors and multiple optocouplers. The mimicry battery controller adjusts the switching states of the multiple optocouplers in the power consumption circuit according to the comparison result, changes the connection relationship between the multiple resistors, and the power consumption circuit consumes power accordingly.

[0012] Optionally, the thermal runaway early warning system based on the biomimetic battery also includes: multiple temperature acquisition chips and an I2C bus. Each temperature acquisition chip is connected to each battery string in the vehicle battery and the biomimetic battery, and collects temperature data of each battery string and the biomimetic battery. The multiple temperature acquisition chips use the I2C bus to send the collected temperature data to the vehicle battery controller or the biomimetic battery controller.

[0013] Optionally, the thermal runaway early warning system based on the mimicry battery further includes a cooling system. The vehicle controller calculates the simulated proportional temperature based on the temperature sent by the mimicry battery controller and the simulated proportional temperature. When the maximum temperature of the vehicle battery collected by the vehicle battery controller is greater than or equal to the simulated proportional temperature, the cooling system is controlled to work to reduce the temperature of the mimicry battery and the vehicle battery.

[0014] A second aspect of the present invention provides a thermal runaway early warning method based on a mimicry battery, applied to the thermal runaway early warning system based on a mimicry battery described in the first aspect and any one of the first aspects of the present invention. The method includes: acquiring the temperature of the mimicry battery simulating the operation of the vehicle battery and the temperature of the vehicle battery during operation; comparing the temperature of the vehicle battery and the temperature of the mimicry battery based on a simulation ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery.

[0015] Optionally, before acquiring the temperature of the mimic battery simulating the operation of the vehicle battery and the temperature of the vehicle battery, the process includes: acquiring the initial power data of the mimic battery and the initial power data of the vehicle battery during operation; determining whether the initial power data of the mimic battery and the initial power data of the vehicle battery during operation meet the simulation ratio; if not, calibrating the initial power data of the mimic battery based on the simulation ratio according to the initial power data of the vehicle battery during operation.

[0016] Optionally, the temperature of the vehicle battery and the temperature of the mimic battery are compared based on a simulated ratio to determine whether to perform thermal runaway warning processing on the vehicle battery, including: calculating the simulated ratio temperature based on the temperature of the mimic battery and the simulated ratio; determining whether the maximum temperature of the vehicle battery is greater than or equal to the simulated ratio temperature; and reducing the temperature of the mimic battery and the vehicle battery when it is greater than or equal to the simulated ratio temperature.

[0017] A third aspect of the present invention provides a thermal runaway early warning device based on a mimicry battery, applied to the thermal runaway early warning system based on a mimicry battery described in the first aspect and any one of the first aspects of the present invention. The device includes: a data acquisition module for acquiring the temperature of the mimicry battery simulating the operation of the vehicle battery and the temperature of the vehicle battery; and an early warning module for comparing the temperature of the vehicle battery and the temperature of the mimicry battery based on a simulation ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery.

[0018] A fourth aspect of the present invention provides a computer-readable storage medium storing computer instructions for causing the computer to execute the thermal runaway early warning method based on a mimicry battery as described in the second aspect and any one of the second aspects of the present invention.

[0019] The technical solution provided by this invention has the following effects:

[0020] The thermal runaway early warning system, method, device, and storage medium based on a mimicry battery provided in this invention simulate the operating state of a vehicle battery using a mimicry battery. Due to the small size and good portability of the mimicry battery, collecting cell temperature data is simpler compared to traditional vehicle battery temperature monitoring. Therefore, comprehensive temperature data collection from the mimicry battery allows for comparison with the vehicle battery's temperature data, providing greater accuracy than directly setting temperature thresholds. This further reduces the possibility of accidents and protects personal and property safety. Furthermore, using a mimicry battery to simulate the vehicle battery's operation facilitates replacement and reduces development costs. This invention solves the technical problems of imperfect thermal runaway early warning systems and false alarms in existing technologies. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a structural block diagram of a thermal runaway early warning system based on a biomimetic battery according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of a biomimetic battery structure according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the mapping circuit according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the power consumption circuit according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of a vehicle battery temperature acquisition circuit according to an embodiment of the present invention;

[0027] Figure 6 This is a flowchart of a thermal runaway early warning method based on a mimicry battery according to an embodiment of the present invention;

[0028] Figure 7 This is a flowchart of a thermal runaway early warning method based on a mimicry battery according to another embodiment of the present invention;

[0029] Figure 8 This is a structural block diagram of a thermal runaway early warning device based on a mimicry battery according to an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the structure of a computer-readable storage medium provided according to an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present invention. Detailed Implementation

[0032] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0033] The terms "first," "second," "third," "fourth," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0034] This invention provides a thermal runaway early warning system based on a mimicry battery, such as... Figure 1As shown, it includes: a vehicle battery, a mimicry battery, a vehicle battery controller, and a mimicry battery controller. The vehicle battery provides power to the vehicle. The mimicry battery simulates the operating state of the vehicle battery, and the temperature rise rate of the mimicry battery is greater than that of the vehicle battery. The mimicry battery controller acquires the temperature of the mimicry battery simulating the operating state of the vehicle battery and sends the acquired temperature to the vehicle battery controller. The vehicle battery controller acquires the temperature of the vehicle battery and compares it with the temperature sent by the mimicry battery controller based on a simulation ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery.

[0035] A mimicry battery is a broad concept with various construction methods. It is a type of physical battery that can be realized in real life. It has stable chemical properties, and its discharge power is proportional to that of the vehicle's on-board power battery. At the same time, when the vehicle battery releases power to electrical appliances, the mimicry battery also releases power in a corresponding proportion. Utilizing this property, it is easy to reflect and simulate the working state of the vehicle.

[0036] like Figure 2 The image shows one structural configuration of a biomimetic battery. (Similar to...) Figure 2 The ternary lithium battery shown uses the same positive and negative electrodes: nickel-cobalt-manganese (NCM) for the positive electrode and graphite for the negative electrode. By altering the ratio of solvent, solute, and additives in the electrolyte, the battery's internal impedance is increased. While ensuring safety, the existing electrolyte is used to achieve a higher heat release rate than current battery types within the same timeframe; that is, the temperature rise rate of the mimic battery is greater than that of the vehicle's battery. The electrolyte uses carbonate solvents and lithium hexafluorophosphate and other lithium salt solutes, along with additives that improve battery conductivity.

[0037] Meanwhile, regarding the mimicry battery, without altering the current battery pack structure, based on the existing battery structure system, 4% to 5% of the volume space within the current battery pack can be used to store the mimicry battery and its controller, with the remaining space used to store the vehicle battery. In other words, the mimicry battery, its controller, and the vehicle battery can all be housed within the battery pack.

[0038] In addition, the mimicry battery controller acquires the temperature of the mimicry battery simulating the operation of the vehicle battery. This can be achieved by acquiring the internal temperature of the mimicry battery cells, the external temperature, or by acquiring the mimicry battery voltage data. For example, the mimicry battery controller can use I / O ports to acquire the voltage of the mimicry battery simulating the operation of the vehicle battery. When calculating the temperature based on the voltage, the correspondence between the mimicry battery voltage and temperature can be predetermined. When the voltage is acquired, the temperature of the mimicry battery is determined based on this correspondence. Alternatively, other existing technologies can be used to acquire the mimicry battery temperature. Furthermore, mimicry circuits can be used to simulate the operating state of the vehicle battery.

[0039] The thermal runaway early warning system based on a mimicry battery provided in this invention continuously adjusts the mimicry battery to simulate the operating state of the entire vehicle battery. Due to the small size and good portability of the mimicry battery, and its simplicity in collecting cell temperature data compared to traditional vehicle battery methods, the system allows for comprehensive temperature data collection from the mimicry battery. This data can be compared with the temperature data of the entire vehicle battery, providing greater accuracy than directly setting temperature thresholds, further reducing the possibility of accidents and ensuring personal and property safety. Furthermore, using a mimicry battery to simulate the operation of the entire vehicle battery facilitates replacement and reduces development costs. This system solves the technical problems of imperfect thermal runaway early warning systems and false alarms in existing technologies.

[0040] In one embodiment, the thermal runaway early warning system further includes: a mapping circuit and a power consumption circuit, wherein the power consumption circuit is connected to the mimicry battery and consumes electrical energy in the mimicry battery; the mimicry battery controller collects a first voltage of the mimicry battery after the power consumption circuit consumes electrical energy; the mapping circuit acquires pulse data of the mimicry battery simulating the operation of the vehicle battery output by the vehicle battery controller, converts the pulse data into voltage data, compares it with the first voltage, and obtains a comparison result; the mimicry battery controller adjusts the connection relationship of the power consumption circuit according to the comparison result, changes the electrical energy consumed by the power consumption circuit, so that the voltage data in the comparison result is consistent with the first voltage.

[0041] Specifically, such as Figure 3 As shown, the mapping circuit includes: a pulse output circuit, an adjustable constant current source voltage circuit, and a comparison circuit; the pulse output circuit is used to output pulses, wherein the pulses are calculated by the vehicle battery controller based on the second power data collected when the vehicle battery is working and the analog ratio; the adjustable constant current source voltage circuit is connected to the pulse output circuit and is used to output stable voltage data based on the pulses; the comparison circuit is connected to the adjustable constant current source voltage circuit and is used to invert the stable voltage data and compare it with the first voltage, and output the comparison result.

[0042] The pulse data is calculated as follows: First, the vehicle battery controller collects the power data of the vehicle battery during operation, such as the vehicle battery main circuit voltage U. ns Current I ns The current and voltage data are processed using an analog scaling factor K. s After scaling proportionally (e.g., the simulation scale could be 100:1), the total output power P of the simulated battery is obtained. NT Maximum power P A maximum duty cycle f A Then, the corresponding PWM wave pulse is calculated using the following formula and output through the pulse circuit; when the vehicle battery operates in different states, the pulse circuit outputs different duty cycles f. PWM The pulse.

[0043] P NT = ns ×I ns ×K s

[0044]

[0045] The maximum power and maximum duty cycle can also be obtained from the vehicle battery's operating power data, which is determined by proportional scaling. The pulse circuit specifically includes a fifth resistor and a sixth resistor, and their connection relationship is shown in the figure.

[0046] like Figure 3 As shown, the adjustable constant current source voltage circuit includes: a pulse conversion circuit, a voltage regulator circuit, and a constant current source circuit connected in sequence. The pulse conversion circuit includes a light source and a photoresistor. The light source emits light of different brightness according to the pulse, and the photoresistor outputs different voltages according to the different brightness of the light. The voltage regulator circuit includes an operational amplifier and a voltage follower circuit composed of multiple resistors to output a stable voltage. The constant current source circuit includes multiple resistors and two transistors to achieve constant current in the adjustable constant current source voltage circuit.

[0047] The light source receives pulses from the pulse output circuit. Different pulse duty cycles result in different light brightness levels. The light source is positioned directly opposite the photoresistor R2, which senses the varying light brightness and adjusts its resistance accordingly. Simultaneously, a constant current source circuit, composed of transistors VT1 and VT2, resistors R1, R, and R7, maintains a constant current flowing through the photoresistor. Therefore, when the resistance of the photoresistor changes, the voltage across it changes, allowing the system to sense changes in the vehicle battery's operating state. Furthermore, to ensure the stability of the adjustable constant current source voltage circuit's output voltage, a voltage regulator circuit is included. This voltage regulator circuit comprises an operational amplifier U1, resistor R3, and resistor R4.

[0048] Specifically, regarding the voltage across the photoresistor, or the output voltage V of the adjustable constant current source circuit... gs The following formula can be used to calculate it:

[0049]

[0050] V gs = C ×R7

[0051] like Figure 3 As shown, the comparator circuit consists of a voltage inverting circuit and a voltage comparator circuit. The voltage inverting circuit includes an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a second operational amplifier U2. The adjustable constant current source voltage circuit outputs a voltage V. gs After passing through the voltage inversion circuit, it becomes a negative voltage V. CJ Then, the negative voltage V is compared using a voltage comparator circuit consisting of the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, and the third operational amplifier U3. CJ The first voltage Vnt of the mimic battery after the power consumption circuit consumes electrical energy is compared to determine whether the two are consistent.

[0052] In this circuit, for ease of comparison and calculation, the resistance values ​​of the eighth resistor R8 and the ninth resistor R9 are set to be equal, and the resistance values ​​of the twelfth resistor R12 and the thirteenth resistor R13 are set to be equal. Therefore, the final output voltage value of the comparator circuit is calculated using the following formula:

[0053]

[0054] V CJ =-V gs

[0055]

[0056] Vbc =(V CJ -V nt )

[0057] The comparison result V output by the comparator circuit bc The input can be sent to the biomimetic battery controller for judgment; if the voltage V is negative... CJ If the first voltage Vnt of the mimic battery after the power consumption circuit consumes electrical energy is consistent with the voltage Vnt of the mimic battery, then the comparison result V bc It is 0. Therefore, when V bc The voltage is not zero. The mimicry battery controller adjusts the power consumption circuit to consume electrical energy, changing the first voltage so that V... bc It is 0. When V bc A value of 0 indicates that the mimicry battery is normally simulating the working state of the vehicle battery; temperature data can be collected and compared.

[0058] In one implementation, such as Figure 4 As shown, the power consumption circuit includes multiple resistors and multiple optocouplers. The mimicry battery controller adjusts the switching states of the multiple optocouplers in the power consumption circuit according to the comparison result, changing the connection relationship between the multiple resistors, and thus changing the electrical energy consumed by the power consumption circuit. Specifically, as shown in the figure, the power consumption circuit includes resistors R15 to R24 and optocouplers YD1 to YD6. By adjusting the switching states of the optocouplers, the connection method of the resistors changes accordingly, and the amount of electrical energy or power consumed by the power consumption circuit also changes. The relationship between the number of disconnected optocouplers and the amount of released power is shown in Table 1 below:

[0059] Optical coupler 1 Optical coupler 2 Optical coupler 3 Optical coupler 4 Optical coupler 5 Optical coupler 6 Power rating (W) Level 1 power off off on off off on 0 Level 2 power on on off on on off 0～10 Level 3 power on on off on off off 11～20 Level 4 power on on off off on off 21～30 5-level power on off off on on off 31～40 6-level power off on off on on off 41～50 7-level power on - off off off off 51～60 8-level power off off off on - off 61～70 9-level power on on off off off off 71～80 10-level power off off off on on off 81～90

[0060] Where "off" indicates that the optocoupler is closed, and "on" indicates that the optocoupler is open. This embodiment of the invention only provides a schematic diagram of a power consumption circuit. In other embodiments, the power consumption circuit can also adopt other circuit structures, as long as power consumption and power adjustment can be achieved. For example, multiple resistors and switches can be set, and the connection relationship of the resistors can be changed by the switches.

[0061] In one implementation, such as Figure 5As shown, the thermal runaway early warning system based on the mimicry battery also includes: multiple temperature acquisition chips and an I2C bus. Each temperature acquisition chip is connected to each battery string in the vehicle battery and the mimicry battery, and collects temperature data of each battery string and the mimicry battery. The multiple temperature acquisition chips use the I2C bus to send the collected temperature data to the vehicle battery controller or the mimicry battery controller. For the vehicle battery, the current temperature acquisition method uses daisy-chain communication between temperature acquisition chips such as AEF, that is, temperature data is collected through resistor NTC and transmitted in a daisy chain; for example, AFE1 passes the data down to AEF2... until AFEn, and finally to the MCU. If the daisy chain breaks in the middle, the collected temperature will be invalid. Therefore, the communication method of AFE is changed from daisy chain transmission to I2C bus communication, where each timing signal transmits one frame of data. The data collected by each AEF is stored in the controller in the form of a protocol stack, with the format: WD.T1:20.T2:20.Tn:19,END; converted into the corresponding ASCII code for transmission. The controller uses the I2C bus to wait for the first frame of data WD to be received and continues to receive and send after receiving END. The same steps are performed when the simulated battery is acquiring temperature.

[0062] In one embodiment, the thermal runaway early warning system based on a mimicry battery further includes a cooling system. The vehicle controller calculates a simulated proportional temperature based on the temperature received from the mimicry battery controller and the simulated proportional temperature. When the maximum temperature of the vehicle battery collected by the vehicle battery controller is greater than or equal to the simulated proportional temperature, the cooling system is controlled to operate, reducing the temperature of both the mimicry battery and the vehicle battery. Specifically, since the mimicry battery simulates the operation of the vehicle battery by scaling the simulated proportional temperature, the acquired temperature of the mimicry battery can also be calculated using the simulated proportional temperature and then compared with the temperature of the vehicle battery. The vehicle battery comprises multiple battery cells, thus the collected temperature also includes the temperature of each battery cell. Therefore, during the comparison, the maximum temperature among them is compared with the simulated proportional temperature.

[0063] This invention also provides a thermal runaway early warning method based on a mimicry battery, applied to the thermal runaway early warning system based on a mimicry battery described in the above embodiments, such as... Figure 6 As shown, the method includes: step S101: obtaining the temperature of the simulated vehicle battery when it is working and the temperature of the vehicle battery; step S102: comparing the temperature of the vehicle battery and the temperature of the simulated battery based on the simulation ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery.

[0064] The thermal runaway early warning method based on a mimicry battery provided in this invention simulates the operating state of a vehicle battery using a mimicry battery. Due to the small size and good portability of the mimicry battery, collecting cell temperature data is simpler compared to traditional methods for vehicle batteries. Therefore, comprehensive temperature data can be collected from the mimicry battery and compared with the temperature data of the vehicle battery. This method is more accurate than directly setting temperature thresholds, further reducing the possibility of accidents and ensuring personal and property safety. Furthermore, using a mimicry battery to simulate the operation of the vehicle battery facilitates replacement and reduces development costs. This method solves the technical problems of imperfect thermal runaway early warning and false alarms in existing technologies.

[0065] In one embodiment, before acquiring the temperature of the mimic battery simulating the operation of the vehicle battery and the temperature of the vehicle battery, the process includes: acquiring initial power data of the mimic battery and initial power data of the vehicle battery during operation; determining whether the initial power data of the mimic battery and the initial power data of the vehicle battery during operation meet the simulation ratio; if not, calibrating the initial power data of the mimic battery based on the simulation ratio using the initial power data of the vehicle battery during operation. Specifically, to determine whether the mimic battery is properly simulating the operating state of the vehicle battery, initial power data of the mimic battery, such as voltage and current, can be collected and compared with the initial power data of the vehicle battery during operation to determine whether they are in the corresponding ratio; if not, the mimic battery can be calibrated. The specific calibration method uses the mapping circuit and power consumption circuit in the above embodiment, which will not be described in detail here.

[0066] In one embodiment, the temperature of the vehicle battery and the temperature of the mimic battery are compared based on a simulated scale to determine whether thermal runaway warning processing should be performed on the vehicle battery. This includes: calculating the simulated scale temperature based on the temperature of the mimic battery and the simulated scale; determining whether the maximum temperature of the vehicle battery is greater than or equal to the simulated scale temperature; and if it is greater than or equal to the simulated scale temperature, reducing the temperatures of both the mimic battery and the vehicle battery. Specifically, since the mimic battery simulates the operation of the vehicle battery by scaling the simulated scale, the temperature of the acquired mimic battery can also be calculated using the simulated scale and then compared with the temperature of the vehicle battery. The vehicle battery comprises multiple battery cells, and the collected temperature also includes the temperature of each battery cell. Therefore, during the comparison, the maximum temperature among them is compared with the simulated scale temperature.

[0067] In one implementation, such as Figure 7 As shown, the thermal runaway early warning method based on mimicry batteries is implemented using the following process:

[0068] First, the mimicry battery controller collects data such as temperature, voltage, and current of the mimicry battery. Then, it performs a proportional data calibration with the data collected from the vehicle to determine if it meets the initial state and is proportionally accurate. If this fails, recalibration is performed. Next, it needs to be determined whether the power output of the vehicle battery matches the power output of the mimicry battery. If they match, the temperature detection stage begins; otherwise, the data calibration stage needs to be repeated. Finally, the temperature of the mimicry battery, converted according to a simulated ratio, is compared with the maximum temperature of the vehicle battery. If the temperature of the mimicry battery, after conversion according to the simulated ratio, is lower than the maximum temperature of the vehicle battery, the power output needs to be increased to ensure adequate power. Consistency of vehicle data; if the simulated battery temperature, after being converted according to the simulation ratio, is greater than or equal to the maximum value of the vehicle battery temperature, then it is determined whether the simulated battery temperature is within the abnormal range. If it is within the abnormal range, the data acquisition section is returned to collect data again. If the simulated battery temperature is not abnormal, the temperature rise rate of the simulated battery is again determined whether it is within the reasonable range. If it is not within the reasonable range, the cooling system is turned on to cool the battery temperature and a thermal runaway warning is issued. After the normal temperature is reached, the cooling system is turned off and the normal state is restored. If the temperature rise rate of the simulated battery is within the reasonable range, the process returns to determine whether the simulated battery temperature is within the abnormal range.

[0069] This invention also provides a thermal runaway early warning device based on a mimicry battery, such as... Figure 8 As shown, the thermal runaway early warning system based on a mimicry battery described in the above embodiments includes:

[0070] The data acquisition module is used to acquire the temperature of the simulated vehicle battery during operation and the temperature of the vehicle battery; for details, please refer to the corresponding part of the above method embodiment, which will not be repeated here.

[0071] The early warning module is used to compare the temperature of the vehicle battery and the temperature of the simulated battery based on a simulated ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery. For details, please refer to the corresponding section of the above method embodiment; it will not be repeated here.

[0072] The thermal runaway early warning device based on a mimicry battery provided in this invention simulates the operating state of a vehicle battery using a mimicry battery. Due to the small size and good portability of the mimicry battery, collecting cell temperature data is simpler compared to traditional vehicle battery temperature monitoring. Therefore, comprehensive temperature data can be collected from the mimicry battery, and the collected data can be compared with the temperature data of the vehicle battery. This is more accurate than directly setting temperature thresholds, further reducing the possibility of accidents and ensuring personal and property safety. Furthermore, using a mimicry battery to simulate the operation of the vehicle battery facilitates replacement and reduces development costs. This invention solves the technical problems of imperfect thermal runaway early warning and false alarms in existing technologies.

[0073] For a detailed description of the function of the thermal runaway early warning device based on a mimicry battery provided in this embodiment of the invention, please refer to the description of the thermal runaway early warning method based on a mimicry battery in the above embodiments.

[0074] This invention also provides a storage medium, such as... Figure 9 As shown, a computer program 601 is stored on it. When executed by a processor, this program implements the steps of the thermal runaway early warning method based on a mimicry battery in the above embodiments. The storage medium also stores audio and video stream data, feature frame data, interactive request signaling, encrypted data, and a preset data size. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium may also include combinations of the above types of memory.

[0075] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0076] This invention also provides an electronic device, such as... Figure 10 As shown, the electronic device may include a processor 51 and a memory 52, wherein the processor 51 and the memory 52 may be connected via a bus or other means. Figure 10 Taking the example of a connection between China and Israel via a bus.

[0077] Processor 51 can be a central processing unit (CPU). Processor 51 can also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips.

[0078] The memory 52, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the corresponding program instructions / modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor by running the non-transitory software programs, instructions, and modules stored in the memory 52, thereby realizing the thermal runaway early warning method based on a mimicry battery in the above method embodiments.

[0079] The memory 52 may include a program storage area and a data storage area. The program storage area may store applications required for operating the device and at least one function; the data storage area may store data created by the processor 51, etc. Furthermore, the memory 52 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 52 may optionally include memory remotely located relative to the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0080] The one or more modules are stored in the memory 52, and when executed by the processor 51, they perform the following: Figure 6 -7 The thermal runaway early warning method based on mimicry battery in the embodiment shown.

[0081] For specific details regarding the aforementioned electronic devices, please refer to the relevant documentation. Figures 6 to 7 The relevant descriptions and effects in the illustrated embodiments are for understanding purposes only and will not be repeated here.

[0082] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A thermal runaway early warning system based on a mimicry battery, characterized in that, include: Vehicle battery, biomimetic battery, vehicle battery controller, and biomimetic battery controller. The vehicle battery is used to provide power to the vehicle. The mimicry battery is used to simulate the working state of the vehicle battery, and the temperature of the mimicry battery rises at a rate greater than that of the vehicle battery. The biomimetic battery controller is used to collect the temperature of the biomimetic battery when simulating the operation of the vehicle battery, and send the collected temperature to the vehicle battery controller. The vehicle battery controller is used to acquire the temperature of the vehicle battery and compare it with the temperature sent by the received mimicry battery controller based on a simulation ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery. It also includes: a mapping circuit and a power consumption circuit, wherein the power consumption circuit is connected to the mimicry battery and consumes the electrical energy in the mimicry battery; The mimicry battery controller collects the first voltage of the mimicry battery after the power consumption circuit consumes electrical energy; The mapping circuit acquires the pulse data of the simulated battery working when the vehicle battery controller outputs the pulse data, converts the pulse data into voltage data, compares it with the first voltage, and obtains the comparison result. The mimicry battery controller adjusts the connection relationship of the power consumption circuit according to the comparison result, changes the electrical energy consumed by the power consumption circuit, and makes the voltage data in the comparison result consistent with the first voltage.

2. The thermal runaway early warning system based on a mimicry battery according to claim 1, characterized in that, The mapping circuit includes: a pulse output circuit, an adjustable constant current source voltage circuit, and a comparator circuit; The pulse output circuit is used to output pulses, wherein the pulses are calculated by the vehicle battery controller based on the second power data collected when the vehicle battery is working and the analog ratio. The adjustable constant current source voltage circuit is connected to the pulse output circuit and is used to output stable voltage data according to the pulse. The comparison circuit is connected to the adjustable constant current source voltage circuit and is used to invert the stable voltage data and compare it with the first voltage, and output the comparison result.

3. The thermal runaway early warning system based on a mimicry battery according to claim 2, characterized in that, The adjustable constant current source voltage circuit includes: a pulse conversion circuit, a voltage regulator circuit, and a constant current source circuit connected in sequence. The pulse conversion circuit includes a light source and a photoresistor. The light source emits light of different brightness according to the pulse, and the photoresistor outputs different voltages according to the different brightness of the light. The voltage regulator circuit includes an operational amplifier and a voltage follower circuit composed of multiple resistors, which outputs a stable voltage. The constant current source circuit includes multiple resistors and two transistors, used to achieve constant current in the adjustable constant current source voltage circuit.

4. The thermal runaway early warning system based on a mimicry battery according to claim 1, characterized in that, The power consumption circuit includes multiple resistors and multiple optocouplers. The mimicry battery controller adjusts the switching state of the multiple optocouplers in the power consumption circuit according to the comparison result, changes the connection relationship between the multiple resistors, and the power consumption circuit consumes power accordingly. The system also includes: multiple temperature acquisition chips, an I2C bus, and a cooling system. Each temperature acquisition chip is connected to each battery string and the mimic battery in the vehicle battery, and collects temperature data of each battery string and the mimic battery. Multiple temperature acquisition chips use an I2C bus to send the acquired temperature data to the vehicle battery controller or the biomimetic battery controller. The vehicle battery controller calculates the simulated proportional temperature based on the temperature sent by the mimic battery controller and the simulated proportional temperature. When the maximum temperature of the vehicle battery collected by the vehicle battery controller is greater than or equal to the simulated proportional temperature, the cooling system is controlled to work to reduce the temperature of the mimic battery and the vehicle battery.

5. A method for early warning of thermal runaway based on a mimicry battery, characterized in that, The method applied to the thermal runaway early warning system based on a mimicry battery according to any one of claims 1-4, the method comprising: The temperature of the simulated battery during vehicle battery operation and the temperature of the vehicle battery during vehicle operation are obtained. The temperature of the vehicle battery and the temperature of the simulated battery are compared based on a simulated ratio to determine whether thermal runaway warning processing should be carried out for the vehicle battery. Before obtaining the temperature of the simulated vehicle battery during operation and the temperature of the vehicle battery during operation, the following steps are included: Acquire the initial power data of the biomimetic battery and the initial power data of the vehicle battery during operation; Determine whether the initial power data of the simulated battery and the initial power data of the vehicle battery when it is working meet the simulation ratio; When the conditions are not met, the initial power data of the mimic battery is calibrated based on the initial power data of the vehicle battery during operation, using a simulated ratio.

6. The thermal runaway early warning method based on a mimicry battery according to claim 5, characterized in that, The temperature of the vehicle battery and the temperature of the simulated battery are compared based on a simulated ratio to determine whether thermal runaway warning measures should be implemented for the vehicle battery, including: The simulated scale temperature is calculated based on the temperature of the mimic battery and the simulated scale. Determine whether the maximum temperature of the vehicle battery is greater than or equal to the simulated proportional temperature; When the temperature is greater than or equal to the specified value, reduce the temperature of the biomimetic battery and the vehicle battery.

7. A thermal runaway early warning device based on a mimicry battery, characterized in that, The device is applied to the thermal runaway early warning system based on a biomimetic battery according to any one of claims 1-4, the device comprising: The data acquisition module is used to acquire the temperature of the simulated vehicle battery during operation and the temperature of the vehicle battery itself. The early warning module is used to compare the temperature of the vehicle battery and the temperature of the simulated battery based on a simulated ratio to determine whether to perform thermal runaway early warning processing on the vehicle battery.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the thermal runaway early warning method based on a mimicry battery as described in any one of claims 5-6.

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