Power battery potential thermal runaway detection method, device and equipment and storage medium

Abstract

The invention discloses a potential thermal runaway detection method, device and equipment for a power battery and a storage medium. The method comprises the following steps: acquiring surface temperatures of all battery cells in a battery pack of a current vehicle; the surface temperature is compared with a preset temperature threshold value, and whether an early warning signal is triggered or not is judged according to a comparison result; after the early warning signal is triggered, the battery management system BMS in the dormant state is awakened according to the early warning signal, the battery pack is actively cooled through the BMS, the problems of thermal runaway early warning lag, detection blind areas and BMS failure in the vehicle dormant state can be effectively solved, 24-hour uninterrupted safety monitoring is achieved, meanwhile, the physical installation cost and the insulation risk of battery cells are avoided, and the service life of the battery pack is prolonged. The thermal runaway suppression efficiency of the power battery is remarkably improved, and the risks of cost increase and insulation failure caused by adding temperature sensors to all battery cells are avoided; potential thermal runaway early warning is timely and accurate, the vehicle can work in a dormant state, and the risk of thermal runaway of the battery is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power battery thermal runaway early warning, and in particular relates to a power battery potential thermal runaway detection method, device, equipment and storage medium. BACKGROUND

[0002] Thermal runaway of power batteries is the biggest problem currently faced by the industry. Once thermal runaway of power batteries occurs and protective measures fail, the entire battery pack will become an explosive source of energy, causing damage to vehicles and personnel.

[0003] If the cells that may trigger thermal runaway can be identified in advance, the vehicle can identify the risk in advance and take measures to suppress thermal runaway in the embryonic stage, reducing personnel and property losses.

[0004] Unfortunately, the industry currently lacks appropriate means for judging potential thermal runaway of batteries.

[0005] The existing patent CN114801873A provides a thermal runaway early warning method, but this scheme is based on voltage, gas mass and temperature data of the cells to determine whether there is a possibility of thermal runaway, which has the problems of judgment lag and failure.

[0006] Because the voltage and gas mass of the cells fluctuate very little before thermal runaway, and although the temperature of the cells does change significantly before thermal runaway, not all cells are equipped with temperature sensors. If the cell that has thermal runaway is not equipped with a thermocouple, the temperature data cannot determine whether the battery pack has the possibility of thermal runaway.

[0007] In addition, because the temperature sensors currently arranged on the cells are contact type sampling, the battery management system (BMS) needs to work continuously. If the vehicle is in a dormant state, the BMS no longer works. Even if the cell has thermal runaway and the temperature rises, and the cell is equipped with a thermocouple, because the BMS is not working, the temperature sensor has no data to send, and the thermal runaway early warning will still fail. SUMMARY

[0008] The main purpose of the present application is to provide a power battery potential thermal runaway detection method, device, equipment and storage medium, which aims to solve the technical problems of power battery thermal runaway early warning lag, detection blind area and early warning failure in the prior art when the vehicle is in a dormant state.

[0009] In a first aspect, the present application provides a power battery potential thermal runaway detection method, which comprises the following steps: obtaining the surface temperature of all cells in the battery pack of the current vehicle; The surface temperature is compared with a preset temperature threshold, and a warning signal is triggered based on the comparison result. After the warning signal is triggered, the battery management system (BMS) in a dormant state is awakened according to the warning signal, and the battery pack is actively cooled by the BMS.

[0010] Optionally, obtaining the surface temperature of all cells in the current vehicle's battery pack includes: The surface temperature of all cells in the current vehicle's battery pack is scanned by rotating an infrared thermometer.

[0011] Optionally, the step of rotating and scanning the surface temperature of all cells in the battery pack of the current vehicle using an infrared thermometer includes: The infrared thermometer, equipped with a rotating mechanism, performs periodic scans along the plane and height of the battery pack according to a preset detection cycle while the vehicle is in sleep mode, thereby obtaining the surface temperature of all cells in the battery pack.

[0012] Optionally, before the step of scanning the surface temperature of all cells in the battery pack of the current vehicle using an infrared thermometer, the method for detecting potential thermal runaway of the power battery further includes: The system acquires the current vehicle's onboard battery charge in real time, and allows the infrared thermometer to start working when the onboard battery charge is greater than a preset remaining charge percentage.

[0013] Optionally, comparing the surface temperature with a preset temperature threshold and determining whether to trigger a warning signal based on the comparison result includes: The surface temperature is compared with a preset temperature threshold to generate a comparison result. When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a warning signal for thermal runaway is triggered. If the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal will not be triggered.

[0014] Optionally, after triggering the warning signal, waking up the dormant battery management system (BMS) according to the warning signal and actively cooling the battery pack through the BMS includes: After the warning signal is triggered, the warning signal is transmitted in real time to the battery management system (BMS) in a dormant state through a preset power supply circuit; The thermal management system is activated via the BMS to actively cool the battery pack.

[0015] Optionally, the step of activating the thermal management system via the BMS and actively cooling the battery pack via the thermal management system includes: The thermal management system is activated via BMS, and the cell number information of the cells with abnormal temperature in the battery pack is received via BMS. Based on the cell number information, the cooling pump is started via the thermal management system to drive the coolant to actively cool the cells with abnormal temperature.

[0016] Secondly, to achieve the above objectives, the present invention also proposes a potential thermal runaway detection device for a power battery, the potential thermal runaway detection device for a power battery comprising: Temperature acquisition module, used to acquire the surface temperature of all cells in the current vehicle's battery pack; The comparison and early warning module is used to compare the surface temperature with a preset temperature threshold and determine whether to trigger an early warning signal based on the comparison result. An active cooling module is used to wake up the battery management system (BMS) from its dormant state after the warning signal is triggered, and to actively cool the battery pack through the BMS.

[0017] Thirdly, to achieve the above objectives, the present invention also proposes a potential thermal runaway detection device for a power battery, the potential thermal runaway detection device for a power battery comprising: a memory, a processor, and a potential thermal runaway detection program for a power battery stored in the memory and executable on the processor, the potential thermal runaway detection program for a power battery being configured to implement the steps of the potential thermal runaway detection method for a power battery as described above.

[0018] Fourthly, to achieve the above objectives, the present invention also proposes a storage medium storing a potential thermal runaway detection program for a power battery, wherein when the potential thermal runaway detection program for a power battery is executed by a processor, the program implements the steps of the potential thermal runaway detection method for a power battery as described above.

[0019] This invention proposes a method for detecting potential thermal runaway in power batteries. It acquires the surface temperature of all cells in the current vehicle's battery pack; compares the surface temperature with a preset temperature threshold; and determines whether a warning signal is triggered based on the comparison result. Upon triggering the warning signal, the battery management system (BMS) in a dormant state is activated, and the BMS actively cools the battery pack. This effectively solves the problems of delayed thermal runaway warnings, detection blind spots, and BMS failure in the vehicle's dormant state, achieving 24 / 7 uninterrupted safety monitoring. Simultaneously, it avoids the physical installation costs and insulation risks associated with cells, significantly improving the efficiency of power battery thermal runaway suppression. It avoids the increased costs and insulation failure risks associated with adding temperature sensors to all cells. It can measure and monitor the temperature of all cells in real time, providing timely and accurate potential thermal runaway warnings. It can also operate in the vehicle's dormant state and can be used as an additional means to activate the BMS. This provides a novel potential thermal runaway warning strategy, reducing the risk of battery thermal runaway and improving the speed and efficiency of power battery potential thermal runaway detection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention; Figure 2 This is a flowchart illustrating the first embodiment of the potential thermal runaway detection method for power batteries of the present invention. Figure 3 This is a flowchart illustrating the second embodiment of the potential thermal runaway detection method for power batteries of the present invention. Figure 4 This is a flowchart illustrating the third embodiment of the potential thermal runaway detection method for power batteries of the present invention. Figure 5 This is a flowchart illustrating the fourth embodiment of the potential thermal runaway detection method for power batteries of the present invention. Figure 6 This is a schematic diagram of the overall process of the potential thermal runaway detection method for power batteries in this invention; Figure 7 This is a functional block diagram of the first embodiment of the potential thermal runaway detection device for power batteries of the present invention.

[0021] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The solution of this invention mainly involves: acquiring the surface temperature of all cells in the current vehicle's battery pack; comparing the surface temperature with a preset temperature threshold, and determining whether to trigger a warning signal based on the comparison result; after triggering the warning signal, waking up the dormant Battery Management System (BMS) based on the warning signal, and actively cooling the battery pack through the BMS. This effectively solves the problems of delayed thermal runaway warning, detection blind spots, and BMS failure in the vehicle's dormant state, achieving 24-hour uninterrupted safety monitoring, while avoiding the physical installation costs and insulation risks of the cells, significantly improving the thermal runaway suppression efficiency of the power battery, and avoiding the increased costs and insulation failure risks caused by adding temperature sensors to all cells; it can measure and monitor the temperature of all cells in real time, and the potential thermal runaway warning is timely and accurate; it can also work in the vehicle's dormant state and can be used as an additional means to wake up the BMS; it provides a novel potential thermal runaway warning strategy, reduces the risk of battery thermal runaway, improves the speed and efficiency of potential thermal runaway detection of the power battery, and solves the technical problems of delayed thermal runaway warning, detection blind spots, and warning failure in the existing technology for power battery thermal runaway warning in the vehicle's dormant state.

[0024] Reference Figure 1 , Figure 1 This is a schematic diagram of the device structure of the hardware operating environment involved in the embodiments of the present invention.

[0025] like Figure 1 As shown, the device may include: a processor 1001, such as a CPU; a communication bus 1002; a user interface 1003; a network interface 1004; and a memory 1005. The communication bus 1002 is used to enable communication between these components. The user interface 1003 may include a display screen or an input unit such as a keyboard; optionally, the user interface 1003 may also include a standard wired interface or a wireless interface. The network interface 1004 may optionally include a standard wired interface or a wireless interface (such as a Wi-Fi interface). The memory 1005 may be high-speed RAM or non-volatile memory, such as a disk drive. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0026] Those skilled in the art will understand that Figure 1 The device structure shown does not constitute a limitation on the device and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0027] like Figure 1As shown, the memory 1005, which serves as a storage medium, may include an operating device, a network communication module, a user interface module, and a potential thermal runaway detection program for a power battery.

[0028] The device of the present invention calls the potential thermal runaway detection program of the power battery stored in the memory 1005 through the processor 1001, and performs the following operations: Obtain the surface temperature of all cells in the current vehicle's battery pack; The surface temperature is compared with a preset temperature threshold, and a warning signal is triggered based on the comparison result. After the warning signal is triggered, the battery management system (BMS) in a dormant state is awakened according to the warning signal, and the battery pack is actively cooled by the BMS.

[0029] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: The surface temperature of all cells in the current vehicle's battery pack is scanned by rotating an infrared thermometer.

[0030] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: The infrared thermometer, equipped with a rotating mechanism, performs periodic scans along the plane and height of the battery pack according to a preset detection cycle while the vehicle is in sleep mode, thereby obtaining the surface temperature of all cells in the battery pack.

[0031] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: The system acquires the current vehicle's onboard battery charge in real time, and allows the infrared thermometer to start working when the onboard battery charge is greater than a preset remaining charge percentage.

[0032] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: The surface temperature is compared with a preset temperature threshold to generate a comparison result. When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a warning signal for thermal runaway is triggered. If the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal will not be triggered.

[0033] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: After the warning signal is triggered, the warning signal is transmitted in real time to the battery management system (BMS) in a dormant state through a preset power supply circuit; The thermal management system is activated via the BMS to actively cool the battery pack.

[0034] The device of the present invention, through processor 1001 calling the potential thermal runaway detection program of the power battery stored in memory 1005, also performs the following operations: The thermal management system is activated via BMS, and the cell number information of the cells with abnormal temperature in the battery pack is received via BMS. Based on the cell number information, the cooling pump is started via the thermal management system to drive the coolant to actively cool the cells with abnormal temperature.

[0035] This embodiment, through the above-described scheme, acquires the surface temperature of all cells in the current vehicle's battery pack; compares the surface temperature with a preset temperature threshold, and determines whether to trigger a warning signal based on the comparison result; after triggering the warning signal, it wakes up the dormant Battery Management System (BMS) and actively cools the battery pack through the BMS. This effectively solves the problems of delayed thermal runaway warning, detection blind spots, and BMS failure in the vehicle's dormant state, achieving 24-hour uninterrupted safety monitoring. Simultaneously, it avoids the physical installation costs and insulation risks associated with cells, significantly improving the thermal runaway suppression efficiency of the power battery. It avoids the increased costs and insulation failure risks caused by adding temperature sensors to all cells; it can measure and monitor the temperature of all cells in real time, providing timely and accurate warnings of potential thermal runaway; it can also operate in the vehicle's dormant state and can be used as an additional means to wake up the BMS; it provides a novel potential thermal runaway warning strategy, reducing the risk of battery thermal runaway and improving the speed and efficiency of potential thermal runaway detection in power batteries.

[0036] Based on the above hardware structure, an embodiment of the potential thermal runaway detection method for power batteries of the present invention is proposed.

[0037] Reference Figure 2 , Figure 2 This is a flowchart illustrating the first embodiment of the potential thermal runaway detection method for power batteries according to the present invention.

[0038] In the first embodiment, the method for detecting potential thermal runaway of a power battery includes the following steps: Step S10: Obtain the surface temperature of all cells in the battery pack of the current vehicle.

[0039] It should be noted that obtaining the surface temperature of all cells in the current vehicle's battery pack can serve as a basis for judging potential thermal runaway of the power battery.

[0040] Step S20: Compare the surface temperature with a preset temperature threshold, and determine whether to trigger a warning signal based on the comparison result.

[0041] It should be understood that by comparing the surface temperature with a preset temperature threshold to generate a comparison result, and then determining whether to trigger a warning signal based on the comparison result, it is possible to achieve early and accurate warning of the incipient stage of thermal runaway.

[0042] Step S30: After the warning signal is triggered, the battery management system (BMS) in hibernation state is woken up according to the warning signal, and the battery pack is actively cooled by the BMS.

[0043] Understandably, after the warning signal is triggered, the BMS in dormant state is awakened by the warning signal. The BMS then starts the thermal management system to actively cool the battery pack, achieving precise suppression of the initial stage of thermal runaway and completely solving the safety hazard of thermal runaway warning failure in the vehicle's dormant state.

[0044] This embodiment, through the above-described scheme, acquires the surface temperature of all cells in the current vehicle's battery pack; compares the surface temperature with a preset temperature threshold, and determines whether to trigger a warning signal based on the comparison result; after triggering the warning signal, it wakes up the dormant Battery Management System (BMS) and actively cools the battery pack through the BMS. This effectively solves the problems of delayed thermal runaway warning, detection blind spots, and BMS failure in the vehicle's dormant state, achieving 24-hour uninterrupted safety monitoring. Simultaneously, it avoids the physical installation costs and insulation risks associated with cells, significantly improving the thermal runaway suppression efficiency of the power battery. It avoids the increased costs and insulation failure risks caused by adding temperature sensors to all cells; it can measure and monitor the temperature of all cells in real time, providing timely and accurate warnings of potential thermal runaway; it can also operate in the vehicle's dormant state and can be used as an additional means to wake up the BMS; it provides a novel potential thermal runaway warning strategy, reducing the risk of battery thermal runaway and improving the speed and efficiency of potential thermal runaway detection in power batteries.

[0045] Furthermore, Figure 3 This is a flowchart illustrating the second embodiment of the potential thermal runaway detection method for power batteries of the present invention, as shown below. Figure 3 As shown, based on the first embodiment, a second embodiment of the method for detecting potential thermal runaway of a power battery according to the present invention is proposed. In this embodiment, step S10 specifically includes the following steps: Step S11: Use an infrared thermometer to rotate and scan the surface temperature of all cells in the battery pack of the current vehicle.

[0046] It should be noted that the rotating mechanism of the infrared thermometer can perform non-contact scanning of the surface of all cells in the battery pack, and obtain cell temperature data in real time.

[0047] Furthermore, step S11 specifically includes the following steps: The infrared thermometer, equipped with a rotating mechanism, performs periodic scans along the plane and height of the battery pack according to a preset detection cycle while the vehicle is in sleep mode, thereby obtaining the surface temperature of all cells in the battery pack.

[0048] It is understandable that when the vehicle is in sleep mode, the infrared thermometer can scan along the plane and height of the battery pack at a preset cycle, such as 10 seconds, to obtain the surface temperature of all battery cells in real time, thus achieving blind-spot-free monitoring. Of course, it can also be set to other values, and this embodiment does not limit this.

[0049] Furthermore, prior to step S11, the battery potential thermal runaway detection method further includes the following steps: The system acquires the current vehicle's onboard battery charge in real time, and allows the infrared thermometer to start working when the onboard battery charge is greater than a preset remaining charge percentage.

[0050] It should be understood that when the vehicle is in sleep mode, the system monitors the battery level in real time and only allows the infrared thermometer to start working when the battery level is higher than a preset threshold (e.g., 30%), in order to avoid excessive power consumption during sleep and ensure that the thermal runaway monitoring function can continue to operate when the battery is sufficiently charged, while also ensuring normal power supply to other vehicle systems.

[0051] This embodiment, through the above-described scheme, uses an infrared thermometer to rotate and scan the surface temperature of all cells in the current vehicle's battery pack, effectively eliminating the detection blind spots of existing contact sensors and providing a fully covered and accurate temperature data basis for early warning of thermal runaway.

[0052] Furthermore, Figure 4 This is a flowchart illustrating the third embodiment of the potential thermal runaway detection method for power batteries of the present invention, as shown below. Figure 4 As shown, based on the first embodiment, a third embodiment of the method for detecting potential thermal runaway of a power battery according to the present invention is proposed. In this embodiment, step S20 specifically includes the following steps: Step S21: Compare the surface temperature with a preset temperature threshold to generate a comparison result.

[0053] It should be noted that comparing the surface temperature with a preset temperature threshold can generate a corresponding temperature comparison result.

[0054] Step S22: When the comparison result shows that the surface temperature of any cell exceeds the preset temperature threshold, a thermal runaway warning signal is triggered.

[0055] It is understood that when the comparison results show that the surface temperature of any cell continues to exceed the preset temperature threshold, such as 80°C, the infrared thermometer immediately triggers a thermal runaway warning signal, realizing accurate early warning at the incipient stage of thermal runaway (2-3 hours in advance), effectively solving the problem of warning lag caused by sudden data changes after thermal runaway in the prior art, and gaining critical response time for battery safety protection. Of course, other values ​​can also be set, and this embodiment does not limit this.

[0056] Step S23: When the comparison result shows that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal is not triggered.

[0057] It should be understood that when the surface temperature of all cells does not exceed the preset temperature threshold, the system will not trigger an early warning signal, effectively avoiding false alarms caused by ambient temperature fluctuations or normal temperature rise of the cells. This ensures that the early warning mechanism is activated only when a real thermal runaway risk occurs (temperature continues to rise to the critical point), significantly improving the accuracy and reliability of the monitoring system, while reducing unnecessary BMS wake-ups and energy waste.

[0058] This embodiment, through the above-described scheme, generates a comparison result by comparing the surface temperature with a preset temperature threshold. When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a thermal runaway warning signal is triggered. When the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal is not triggered. This approach can accurately identify the initial stage of thermal runaway, triggering the warning signal only when the temperature exceeds the limit, avoiding false alarms caused by environmental fluctuations, and maintaining system stability when the temperature does not exceed the limit. This completely solves the problems of delayed warnings and false alarms in existing technologies, significantly improving the reliability and timeliness of thermal runaway monitoring for power batteries.

[0059] Furthermore, Figure 5 This is a flowchart illustrating the fourth embodiment of the potential thermal runaway detection method for power batteries of the present invention, as shown below. Figure 5 As shown, based on the first embodiment, a fourth embodiment of the method for detecting potential thermal runaway of a power battery according to the present invention is proposed. In this embodiment, step S30 specifically includes the following steps: Step S31: After the warning signal is triggered, the warning signal is transmitted in real time to the battery management system (BMS) in dormant state through a preset power supply circuit.

[0060] It should be noted that after the infrared thermometer triggers the thermal runaway warning signal, the signal is transmitted to the dormant BMS in real time through a preset low-voltage power supply circuit (designed specifically for the dormant state). This ensures that the BMS can still be accurately woken up and start the thermal management system after the vehicle is turned off, completely solving the problem of warning failure caused by the BMS being unable to receive signals in the dormant state in the existing technology, and realizing 24-hour uninterrupted safety monitoring.

[0061] Step S32: Start the thermal management system via BMS and actively cool the battery pack via the thermal management system.

[0062] Understandably, by activating the thermal management system through the BMS, the thermal management system actively cools the battery pack, achieving a rapid temperature drop and effectively suppressing the risk of thermal runaway in its incipient stage (2-3 hours earlier), thus ensuring the safety of the power battery.

[0063] Furthermore, step S32 specifically includes the following steps: The thermal management system is activated via BMS, and the cell number information of the cells with abnormal temperature in the battery pack is received via BMS. Based on the cell number information, the cooling pump is started via the thermal management system to drive the coolant to actively cool the cells with abnormal temperature.

[0064] It should be understood that after the infrared thermometer triggers a thermal runaway warning signal to wake up the BMS from its dormant state, the BMS activates the thermal management system, receives the cell number information of the cells with abnormal temperatures in the battery pack, and accurately starts the cooling pump to drive the coolant according to the number, so as to actively cool the specific cells with abnormal temperatures, thereby achieving targeted suppression of thermal runaway risk, avoiding the energy waste of full-pack cooling, and significantly improving cooling efficiency and system reliability.

[0065] In the specific implementation, see Figure 6 , Figure 6 This is a schematic diagram of the overall process of the potential thermal runaway detection method for power batteries of the present invention, as shown below. Figure 6 As shown, in the vehicle's sleep state, the on-board battery power is monitored in real time. When the power exceeds 30%, intelligent charging is activated. Subsequently, a temperature detection command is sent every 10 seconds to trigger the infrared thermometer to start working. The infrared thermometer rotates the control panel to perform a 360-degree scan of the XY plane and automatically adjusts the Z-axis scanning angle. It periodically detects the surface temperature of all battery cells, records the cell numbers, and outputs the temperature data and numbers to the BMS in real time, achieving early monitoring of thermal runaway with no blind spots and low power consumption.

[0066] It should be noted that, regarding the current industry issue of the difficulty in judging potential thermal runaway in batteries: Before thermal runaway occurs, side reactions continue to occur inside the battery, causing the battery temperature to gradually rise. Moreover, the time from the start of temperature rise to the triggering of thermal runaway is very long. During this process, the changes in battery voltage and gas production are very slight. Therefore, judging whether the battery pack has thermal runaway failure by the battery temperature is the most intuitive method.

[0067] However, not every cell is equipped with a thermocouple, so the temperature rise of the battery before thermal runaway may not be detected in advance.

[0068] If each battery were equipped with a thermocouple, the cost of the entire battery pack would rise to an unacceptable level.

[0069] Furthermore, the need for a thermocouple for each battery increases the required data acquisition path and wiring harness, which also exacerbates the risk of internal insulation failure after thermal runaway.

[0070] Therefore, conventional contact-based temperature sampling methods are difficult to use in determining potential thermal runaway in battery packs.

[0071] In the proposed solution of this embodiment, an infrared thermometer is added inside the battery pack, which can effectively obtain the surface temperature of the battery cell through non-contact temperature measurement.

[0072] Another advantage of non-contact temperature measurement is that there is no wire harness constraint, which allows for the addition of a rotating mechanism to allow the infrared thermometer to rotate within the battery pack along the plane and the height of the battery pack, ensuring that the infrared thermometer can scan all the battery cells and measure the temperature of all the battery cells.

[0073] When the infrared thermometer scans a battery cell, if the cell temperature exceeds 80°C, the infrared thermometer will immediately send a command to the BMS to determine that the cell has the potential for thermal runaway, thus prompting the vehicle's thermal management system to start working.

[0074] The thermal management cooling command was then executed to cool the battery, minimizing the possibility of thermal runaway in the cell.

[0075] In addition, since the infrared thermometer operates on a low-voltage power supply and can still maintain sampling even when the BMS is not working, even if the vehicle is in a dormant state, once the thermometer detects a potential thermal runaway signal, the signal can be used as a means to wake up the BMS, avoiding the problem in conventional solutions where the battery temperature sensor cannot work when the BMS is not working.

[0076] This embodiment, through the above-described scheme, transmits the warning signal in real time to the battery management system (BMS) in a dormant state via a preset power supply circuit after the warning signal is triggered. The BMS then activates the thermal management system to actively cool the battery pack. This effectively solves the problems of delayed thermal runaway warnings, detection blind spots, and BMS failure in the vehicle's dormant state, achieving 24 / 7 uninterrupted safety monitoring. Simultaneously, it avoids the physical installation costs and insulation risks associated with battery cells, significantly improving the thermal runaway suppression efficiency of the power battery. It avoids the increased costs and insulation failure risks caused by adding temperature sensors to all cells. It can measure and monitor the temperature of all cells in real time, providing timely and accurate warnings of potential thermal runaway. It can also operate in the vehicle's dormant state and can be used as an additional means to wake up the BMS. This provides a novel potential thermal runaway warning strategy, reducing the risk of battery thermal runaway and improving the speed and efficiency of potential thermal runaway detection in power batteries.

[0077] Accordingly, the present invention further provides a potential thermal runaway detection device for power batteries.

[0078] Reference Figure 7 , Figure 7 This is a functional block diagram of the first embodiment of the potential thermal runaway detection device for power batteries of the present invention.

[0079] In a first embodiment of the potential thermal runaway detection device for a power battery of the present invention, the potential thermal runaway detection device for a power battery includes: Temperature acquisition module 10 is used to acquire the surface temperature of all cells in the battery pack of the current vehicle.

[0080] The comparison and warning module 20 is used to compare the surface temperature with a preset temperature threshold and determine whether to trigger a warning signal based on the comparison result.

[0081] The active cooling module 30 is used to wake up the battery management system (BMS) in a dormant state after the warning signal is triggered, and to actively cool the battery pack through the BMS.

[0082] The temperature acquisition module 10 is also used to scan the surface temperature of all cells in the battery pack of the current vehicle by rotating an infrared thermometer.

[0083] The temperature acquisition module 10 is also used to periodically scan along the plane and height of the battery pack according to a preset detection cycle using the rotating mechanism of the infrared thermometer in the current vehicle dormant state, in order to obtain the surface temperature of all cells in the battery pack.

[0084] The temperature acquisition module 10 is also used to acquire the current vehicle's on-board battery power in real time, and to allow the infrared thermometer to start working when the on-board battery power is greater than a preset remaining power percentage.

[0085] The comparison and early warning module 20 is also used to compare the surface temperature with a preset temperature threshold and generate a comparison result; When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a warning signal for thermal runaway is triggered. If the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal will not be triggered.

[0086] The active cooling module 30 is also used to transmit the warning signal to the battery management system (BMS) in a dormant state in real time through a preset power supply circuit after the warning signal is triggered; and to start the thermal management system through the BMS to actively cool the battery pack.

[0087] The active cooling module 30 is also used to activate the thermal management system through the BMS, receive the cell number information of the abnormal temperature cell in the battery pack through the BMS, and start the cooling pump to drive the coolant to actively cool the abnormal temperature cell through the thermal management system according to the cell number information.

[0088] The steps for implementing each functional module of the potential thermal runaway detection device for power batteries can be referred to in the various embodiments of the potential thermal runaway detection method for power batteries of the present invention, and will not be repeated here.

[0089] Furthermore, this invention also proposes a storage medium storing a potential thermal runaway detection program for a power battery. When the potential thermal runaway detection program is executed by a processor, it performs the following operations: Obtain the surface temperature of all cells in the current vehicle's battery pack; The surface temperature is compared with a preset temperature threshold, and a warning signal is triggered based on the comparison result. After the warning signal is triggered, the battery management system (BMS) in a dormant state is awakened according to the warning signal, and the battery pack is actively cooled by the BMS.

[0090] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: The surface temperature of all cells in the current vehicle's battery pack is scanned by rotating an infrared thermometer.

[0091] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: The infrared thermometer, equipped with a rotating mechanism, performs periodic scans along the plane and height of the battery pack according to a preset detection cycle while the vehicle is in sleep mode, thereby obtaining the surface temperature of all cells in the battery pack.

[0092] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: The system acquires the current vehicle's onboard battery charge in real time, and allows the infrared thermometer to start working when the onboard battery charge is greater than a preset remaining charge percentage.

[0093] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: The surface temperature is compared with a preset temperature threshold to generate a comparison result. When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a warning signal for thermal runaway is triggered. If the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal will not be triggered.

[0094] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: After the warning signal is triggered, the warning signal is transmitted in real time to the battery management system (BMS) in a dormant state through a preset power supply circuit; The thermal management system is activated via the BMS to actively cool the battery pack.

[0095] Furthermore, when the power battery potential thermal runaway detection program is executed by the processor, it also performs the following operations: The thermal management system is activated via BMS, and the cell number information of the cells with abnormal temperature in the battery pack is received via BMS. Based on the cell number information, the cooling pump is started via the thermal management system to drive the coolant to actively cool the cells with abnormal temperature.

[0096] Those skilled in the art will understand that all or part of the steps in the methods described above can be implemented by a program instructing related hardware. The program is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium is a computer-readable storage medium, including: USB flash drive, mobile hard drive, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk, and other media that can store program code.

[0097] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0098] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0099] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for detecting potential thermal runaway in a power battery, characterized in that, The method for detecting potential thermal runaway of a power battery includes: Obtain the surface temperature of all cells in the current vehicle's battery pack; The surface temperature is compared with a preset temperature threshold, and a warning signal is triggered based on the comparison result. After the warning signal is triggered, the battery management system (BMS) in a dormant state is awakened according to the warning signal, and the battery pack is actively cooled by the BMS.

2. The method for detecting potential thermal runaway of a power battery as described in claim 1, characterized in that, The step of obtaining the surface temperature of all cells in the current vehicle's battery pack includes: The surface temperature of all cells in the current vehicle's battery pack is scanned by rotating an infrared thermometer.

3. The method for detecting potential thermal runaway of a power battery as described in claim 2, characterized in that, The step of scanning the surface temperature of all cells in the battery pack of the current vehicle using an infrared thermometer includes: The infrared thermometer, equipped with a rotating mechanism, performs periodic scans along the plane and height of the battery pack according to a preset detection cycle while the vehicle is in sleep mode, thereby obtaining the surface temperature of all cells in the battery pack.

4. The method for detecting potential thermal runaway of a power battery as described in claim 2, characterized in that, Before the step of scanning the surface temperature of all cells in the battery pack of the current vehicle using an infrared thermometer, the method for detecting potential thermal runaway of the power battery further includes: The system acquires the current vehicle's onboard battery charge in real time, and allows the infrared thermometer to start working when the onboard battery charge is greater than a preset remaining charge percentage.

5. The method for detecting potential thermal runaway of a power battery as described in claim 1, characterized in that, The step of comparing the surface temperature with a preset temperature threshold and determining whether to trigger a warning signal based on the comparison result includes: The surface temperature is compared with a preset temperature threshold to generate a comparison result. When the comparison result indicates that the surface temperature of any cell exceeds the preset temperature threshold, a warning signal for thermal runaway is triggered. If the comparison result indicates that the surface temperature of any cell does not exceed the preset temperature threshold, the warning signal will not be triggered.

6. The method for detecting potential thermal runaway of a power battery as described in claim 1, characterized in that, Upon triggering the warning signal, the battery management system (BMS) in a dormant state is awakened according to the warning signal, and the battery pack is actively cooled by the BMS, including: After the warning signal is triggered, the warning signal is transmitted in real time to the battery management system (BMS) in a dormant state through a preset power supply circuit; The thermal management system is activated via the BMS to actively cool the battery pack.

7. The method for detecting potential thermal runaway of a power battery as described in claim 6, characterized in that, The step of activating the thermal management system via the BMS and actively cooling the battery pack through the thermal management system includes: The thermal management system is activated via BMS, and the cell number information of the cells with abnormal temperature in the battery pack is received via BMS. Based on the cell number information, the cooling pump is started via the thermal management system to drive the coolant to actively cool the cells with abnormal temperature.

8. A potential thermal runaway detection device for a power battery, characterized in that, The potential thermal runaway detection device for the power battery includes: Temperature acquisition module, used to acquire the surface temperature of all cells in the current vehicle's battery pack; The comparison and early warning module is used to compare the surface temperature with a preset temperature threshold and determine whether to trigger an early warning signal based on the comparison result. An active cooling module is used to wake up the battery management system (BMS) from its dormant state after the warning signal is triggered, and to actively cool the battery pack through the BMS.

9. A device for detecting potential thermal runaway of a power battery, characterized in that, The potential thermal runaway detection device for a power battery includes: a memory, a processor, and a potential thermal runaway detection program for a power battery stored in the memory and executable on the processor, wherein the potential thermal runaway detection program for a power battery is configured to implement the steps of the potential thermal runaway detection method for a power battery as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium stores a potential thermal runaway detection program for a power battery, which, when executed by a processor, implements the steps of the potential thermal runaway detection method for a power battery as described in any one of claims 1 to 7.

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