Thermal runaway alarm method and device

Abstract

The invention provides a thermal runaway alarm device and method, and belongs to the technical field of battery thermal runaway. The method comprises the steps that a thermal battery module supplies power to a battery management module after the temperature reaches a first threshold value and is activated, a first power management module is connected with a control module, and then the first power management module supplies power to the control module according to the power supply state of the thermal battery module; therefore, the control module gives a thermal runaway alarm when the temperature reaches the second threshold value, and the safety and reliability of lithium battery management are improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery thermal runaway, and in particular to a thermal runaway alarm method and device. Background Art

[0002] With the development of new energy vehicles, power battery packs have been increasingly widely used in the field of electric vehicles. However, thermal runaway may occur at any stage of the power battery pack's life cycle, including production, transportation, assembly, use, scrapping, decomposition and recycling. Thermal runaway may cause explosion or fire. Therefore, it is necessary to avoid thermal runaway or reduce the damage caused by it.

[0003] In the related art, a thermal runaway alarm is used to warn of a thermal runaway of a battery. The thermal runaway alarm device requires an additional external power supply or is powered by the monitored battery pack itself.

[0004] Since the external power supply or battery pack will self-discharge during use, the life of the heat loss alarm device cannot cover the entire life cycle of the lithium battery pack that needs to be monitored.

[0005] Therefore, when the external power supply fails or the battery pack thermal runaway is damaged, the thermal alarm device loses its ability to work and cannot generate effective warnings, thereby reducing the safety and reliability of power battery management. Summary of the invention

[0006] The present application provides a thermal runaway alarm method and device, which can improve the safety and reliability of power battery management. The technical solution is as follows:

[0007] In one aspect, a thermal runaway alarm device is provided, the device comprising: a thermal battery module, a first power management module and a control module; wherein:

[0008] The thermal battery module is connected to the first power management module, and the thermal battery module supplies power to the battery management module after being activated when the temperature reaches a first threshold;

[0009] The first power management module is connected to the control module, and the first power management module is used to control the power-on of the control module according to the power supply status of the thermal battery module; the control module is used to issue a thermal runaway alarm when the acquired temperature reaches a second threshold.

[0010] In a possible implementation, the thermal battery module includes: a module housing, a battery cell, a first pole lug, and a second pole lug; wherein:

[0011] The module housing has a receiving cavity, the receiving cavity includes a first side wall and a second side wall, the first side wall is provided with a first through hole communicating with the receiving cavity, and the second side wall is provided with the second pole ear;

[0012] The battery core is a multi-layer electrode stacking structure, and the battery core is located in the accommodating cavity;

[0013] The second side wall is provided with a second through hole, and the first electrode tab passes through the second through hole to be connected to the battery core.

[0014] In a possible implementation, the accommodating cavity further includes a third side wall, the third side wall is arranged opposite to the first side wall, a third through hole corresponding to the first through hole is arranged on the third side wall, and the first through hole is connected to the third through hole.

[0015] In a possible implementation, the battery cell includes: a plurality of thermal battery units connected in series, each thermal battery unit having a three-layer electrode stacking structure.

[0016] In a possible implementation, each thermal battery unit includes: a positive electrode plate, a negative electrode plate and an electrolyte, the negative electrode plate is connected to the first side wall, and the negative electrode plate, the electrolyte and the positive electrode plate are stacked in sequence.

[0017] In a possible implementation, the negative electrode plate is lithium silicide, the positive electrode plate is a ferrous sulfide-cobalt sulfide mixture, and the electrolyte is a lithium chloride-potassium chloride mixture.

[0018] In a possible implementation, the first power management module includes: a voltage stabilizing input module, an energy storage module, a power-on switch module, a voltage stabilizing output module and a monitoring module;

[0019] The voltage-stabilizing input module is connected to the thermal battery module, and the voltage-stabilizing input module is used to boost the voltage input by the thermal battery module;

[0020] The energy storage module is connected to the voltage stabilizing output module; the voltage stabilizing output module is used to stabilize the voltage output by the energy storage module and reduce the voltage to a target voltage;

[0021] The power-on switch module is connected to the voltage stabilizing output module and the energy storage module respectively; the power-on switch module is used to trigger the control module to power on after the voltage of the energy storage module is greater than the first threshold and the output voltage of the input voltage stabilizing module reaches the target value;

[0022] The voltage-stabilizing output module is connected to the monitoring module, the voltage-stabilizing output module supplies power to the monitoring module, and the monitoring module is used to reset the control module when the control module is abnormal.

[0023] In a possible implementation, the control module includes: a main control module, a positioning module and a temperature acquisition module, the main control module is connected to the positioning module and the temperature acquisition module respectively, and the main control module is used to control the positioning module to obtain location information when the temperature collected by the temperature acquisition module reaches a second threshold, and send an alarm message carrying the location information.

[0024] In a possible implementation, the device further includes: an insulating shell and an insulating member, the insulating member being attached to the inner wall of the insulating shell, the insulating member being arranged to form a cavity, and the first power management module and the control module are arranged in the cavity.

[0025] On the other hand, a thermal runaway alarm method is provided, the method using a thermal runaway alarm device, the device comprising: a thermal battery module, a battery management module and a control module, the method comprising:

[0026] If the thermal battery module is activated when the temperature reaches a first threshold, the thermal battery module is used to supply power to the battery management module; the first power management module is used to control the power-on of the control module according to the power supply status of the thermal battery module; the control module is used to issue a thermal runaway alarm when the acquired temperature reaches a second threshold.

[0027] The technical solution provided by this application includes at least the following beneficial effects:

[0028] In an embodiment of the present application, the thermal battery module supplies power to the battery management module after the temperature reaches a first threshold and is activated. The thermal battery module has an extremely low risk of self-discharge failure (almost no discharge) and can discharge rapidly after activation. The first power management module is connected to the control module, and then the control module is powered by the first power management module according to the power supply status of the thermal battery module, so that the control module performs a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of power battery management.

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] Figure 1 A top view of a thermal battery module is provided for an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a module housing provided in an embodiment of the present application;

[0033] Figure 3 A cross-sectional view of a thermal battery module provided in an embodiment of the present application;

[0034] Figure 4 A cross-sectional view of a thermal battery module provided in an embodiment of the present application;

[0035] Figure 5 A schematic diagram of the structure of a thermal runaway alarm device provided in an embodiment of the present application;

[0036] Figure 6 A structural block diagram of a thermal runaway alarm device provided in an embodiment of the present application;

[0037] Figure 7 A flow chart of a thermal runaway alarm method provided in an embodiment of the present application.

[0038] Reference numerals:

[0039] 100, first through hole; 110, first pole ear; 120, second pole ear; 130, module housing; 131, first side wall; 132, second side wall; 133, third side wall; 140, battery cell; 150, third through hole; 160, second through hole;

[0040] 200, positive electrode plate; 210, negative electrode plate; 220, electrolyte layer; 230, mica insulation layer; 240, wire; 250, thermal battery unit;

[0041] 300, thermal insulation shell; 310, thermal insulation element;

[0042] 400, control module; 410, thermal battery module; 420, first power management module; 421, voltage stabilizing input module; 422, energy storage module; 423, power-on switch module; 424, voltage stabilizing output module; 425, monitoring module; 430, temperature acquisition module; 440, main control module; 441, second power management module; 442, first logic control module; 443, first RF drive module; 444, level conversion module; 450, positioning module; 451, third power management module; 452, second logic control module; 453, second RF drive module.

[0043] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] The application scenarios of the thermal runaway alarm device are explained below.

[0046] The thermal runaway alarm device of the present application can be used to monitor thermal runaway of lithium batteries, and the power battery can be a battery corresponding to any stage of the production, transportation, assembly, use, scrapping, decomposition and recycling of the power battery in its entire life cycle. When the thermal runaway alarm device is used to monitor the power battery, the thermal runaway alarm device can be placed around the power battery so that the thermal runaway alarm device can be well heated when the power battery is in thermal runaway.

[0047] In an embodiment of the present application, the thermal battery module outputs voltage to the battery management module after the temperature reaches a first threshold and is activated. The thermal battery module does not self-discharge, and the first power management module is connected to the control module, and then the control module is powered by the first power management module according to the power supply status of the thermal battery module, so that the control module performs a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of lithium battery management.

[0048] like Figure 1 As shown, the embodiment of the present application provides a top view of a thermal battery module 410, which can be applied to Figure 3 The thermal runaway alarm device in the module includes: a module housing 130, a battery cell 140, a first pole ear 110, and a second pole ear 120;

[0049] Figure 2 A schematic diagram of the structure of a module housing provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the module shell 130 has a accommodating cavity, which includes a first side wall 131 and a second side wall 132. The first side wall 131 is provided with a first through hole 100 connected to the accommodating cavity, and the second side wall 132 is provided with a second pole ear 120; the battery cell 140 is a multi-layer electrode stacking structure, and the battery cell 140 is located in the accommodating cavity; the second side wall 132 is provided with a second through hole 160, and the first pole ear 110 passes through the second through hole 160 to be connected with the battery cell 140.

[0050] In some embodiments, the module housing 130 can be a good conductor of heat and electricity, so that heat can be quickly transferred to the battery cell 140 in a high temperature environment, and the heat can also be transferred to the battery cell 140 through the first through hole 100, so as to achieve the purpose of quickly activating the thermal battery module 410. For example, the module housing 130 can be steel. The shape of the module housing 130 can be set according to actual conditions. For example, the module housing 130 can be a cube or a cuboid, and the module housing 130 can be integrally formed.

[0051] In some embodiments, the bottom negative electrode plate 210 in the multi-layer electrode stack structure is connected to the module housing 130 by welding, and the second tab 120 is directly welded to the module housing 130. Except for the welding parts in the module housing 130, a mica insulating layer 230 is embedded between the battery cell 140 and the module housing 130 to prevent short circuit between the plates.

[0052] like Figure 3 As shown, an embodiment of the present application provides a cross-sectional view of a thermal battery module, which is a cross-sectional view along the flattening direction of the positive electrode plate adjacent to the mica insulating layer, and the first pole ear 110 passes through the mica insulating layer 230 and is led out from the second through hole 160, and the gap between the first pole ear 110 and the mica insulating layer 230 is filled with a high temperature resistant sealant.

[0053] In some embodiments, the accommodating cavity further includes a third side wall 133 , which is disposed opposite to the first side wall 131 , and a third through hole 150 corresponding to the first through hole 100 is disposed on the third side wall, and the first through hole 100 is connected to the third through hole 150 .

[0054] The number of the first through holes 100 can be set according to actual conditions, for example, the number of the first through holes 100 can be one or more. The number of the third through holes 150 is equal to the number of the first through holes 100.

[0055] The shapes of the first through hole 100 and the third through hole 150 can be set according to actual conditions. For example, the shapes of the first through hole 100 and the third through hole can be circular, square, or rectangular.

[0056] In some embodiments, in order to ensure the purpose of fast activation of the thermal battery module 410, the battery cell 140 may not be disposed in the accommodation cavity through which the first through hole 100 and the third through hole 150 are connected. In order to prevent short circuit, a mica insulating layer 230 is disposed between the accommodation cavity through which the first through hole 100 and the third through hole 150 are connected and the battery cell 140.

[0057] like Figure 4As shown, an embodiment of the present application provides a cross-sectional view of a thermal battery module, wherein the battery cell 140 includes: a plurality of thermal battery units 250 connected in series, each thermal battery unit 250 being a three-layer electrode stacking structure. In some embodiments, each thermal battery unit 250 includes: a positive electrode plate 200, a negative electrode plate 210 and an electrolyte 220, wherein the negative electrode plate 210 is connected to the first side wall 131, and the negative electrode plate 210, the electrolyte 220 and the positive electrode plate 200 are stacked in sequence.

[0058] Among them, the negative plate 210 is lithium silicide, the positive plate 200 is a mixture of ferrous sulfide-cobalt sulfide, and the electrolyte 220 is a mixture of lithium chloride-potassium chloride. The ferrous sulfide-cobalt sulfide mixture has excellent redox properties, good electronic conductivity and a thermal decomposition temperature of not less than 570°C. Lithium silicide has a high energy density, good electronic conductivity and a thermal decomposition temperature of not less than 730°C. The lithium chloride-potassium chloride mixture can achieve a higher conductivity, a melting temperature of 352°C, and a melting enthalpy of 235.6J / g, thereby ensuring that when the lithium battery is thermally runaway, the thermal battery module 410 is quickly activated and discharged to the outside.

[0059] In some embodiments, 20% to 30% by mass of flow inhibitor may be mixed into the electrolyte 220. For example, the flow inhibitor may be magnesium oxide and magnesium fluoride. The flow inhibitor in the electrolyte 220 is a material used to inhibit the flow of the electrolyte 220, which is added to the thermal battery to fix the molten electrolyte 220 to prevent leakage and internal short circuit.

[0060] The working principle of the thermal battery module 410 is introduced below:

[0061] There is no active heating device inside the thermal battery module 410. When the lithium battery pack experiences thermal runaway, the external high temperature is transmitted to the inside of the battery cell 140 through the through holes on the module shell 130 of the thermal battery module 410. The electrolyte 220 in the battery cell 140 absorbs heat and melts to form an ion channel, so that the thermal battery module 410 is activated and starts to discharge externally.

[0062] like Figure 6 As shown, the embodiment of the present application provides a structural block diagram of a thermal runaway alarm device, the device includes: a thermal battery module 410, a first power management module 420 and a control module 400; wherein,

[0063] The thermal battery module 410 is connected to the first power management module 420, and the thermal battery module 410 supplies power to the battery management module after being activated when the temperature reaches a first threshold;

[0064] The first power management module 420 is connected to the control module 400, and is used to control the control module 400 to power on according to the power supply status of the thermal battery module 410; the control module 400 is used to issue a thermal runaway alarm when the acquired temperature reaches a second threshold.

[0065] In some embodiments, the thermal battery module 410 may be Figure 1 A thermal battery module 410 is shown in the illustrated embodiment.

[0066] Figure 5 A schematic diagram of the structure of a thermal runaway alarm device is provided for an embodiment of the present application, such as Figure 5 As shown, the thermal runaway alarm device also includes: an insulating shell 300, an insulating member 310, the insulating member 310 is attached to the inner wall of the insulating shell 300, the insulating member 310 is arranged to form a cavity, and the first power management module 420 and the control module 400 are arranged in the cavity.

[0067] In some embodiments, the heat insulating member 310 is a silicon dioxide aerogel heat insulating material. The heat insulating housing 300 is a high temperature resistant non-metallic material, such as ceramic.

[0068] like Figure 5 As shown, an embodiment of the present application provides a structural block diagram of a thermal runaway alarm device, wherein a thermal battery module 410 is fixed to an insulating shell 300 by riveting, and a first pole ear 110 and a second pole ear 120 of the thermal battery module 410 are respectively extended into the interior of the insulating shell 300, and power is supplied to the first power management module 420 and the control module 400 through a wire 240 passing through the insulating member 310, so as to reduce heat transferred to the first power management module 420 and the control module 400 through the power supply line.

[0069] It should be noted that, in order for the first pole tab 110 and the second pole tab 120 to extend into the interior of the heat-insulating housing 300 respectively, two through holes are provided on the heat-insulating housing 300, and the positions and sizes of the two through holes are provided according to the first pole tab 110 and the second pole tab 120, and the first pole tab 110 and the second pole tab 120 extend into the interior of the heat-insulating housing 300 respectively through the corresponding through holes. No heat insulating member 310 is provided at the positions where the first pole tab 110 and the second pole tab 120 extend into the interior of the heat-insulating housing 300 respectively.

[0070] In some embodiments, the first power management module 420 includes: a voltage stabilization input module 421, an energy storage module 422, a power-on switch module 423, a voltage stabilization output module 424, and a monitoring module 425;

[0071] The voltage-stabilizing input module 421 is connected to the thermal battery module 410 and the energy storage module 422 respectively, and the voltage-stabilizing input module 421 is used to boost the voltage input by the thermal battery module 410 and input it to the energy storage module 422; the energy storage module 422 is connected to the voltage-stabilizing output module 424; the voltage-stabilizing output module 424 is used to stabilize the voltage output by the energy storage module 422 and reduce the voltage to the target voltage; the power-on switch module 423 is connected to the voltage-stabilizing output module 424 and the energy storage module 422 respectively; the power-on switch module 423 is used to trigger the control module 400 to power on after the voltage of the energy storage module 422 is greater than the first threshold value and the output voltage of the voltage-stabilizing output module 424 reaches the target value; the voltage-stabilizing output module 424 is connected to the monitoring module 425, and the voltage-stabilizing output module 424 supplies power to the monitoring module 425, and the monitoring module 425 is used to reset the control module 400 when the control module 400 is abnormal.

[0072] Among them, the voltage-stabilizing input module 421 boosts the voltage to obtain a first voltage, and inputs the first voltage into the energy storage module 422 to charge the energy storage module 422. The magnitude of the first voltage is related to the circuit in the voltage-stabilizing input module 421, and corresponding calculations are performed according to the specific circuit.

[0073] The voltage stabilizing output module 424 is a step-down switching power management chip, which can stabilize the changing voltage output by the energy storage module 422 to a target voltage. The target voltage can be set according to actual conditions, for example, the target voltage can be 5V.

[0074] The first power management module 420 can perform secondary energy storage on the thermal battery module 410. When the thermal battery module 410 is exhausted or burns out, the energy storage module 422 can supply power to subsequent modules, thereby extending the working time of the thermal runaway alarm device.

[0075] The monitoring module 425 is a watchdog chip. The control module 400 periodically sends a pulse signal to the monitoring module 425 to indicate the working status. When the program running in the control module 400 is abnormal, the pulse signal is interrupted and the monitoring module 425 resets the control module 400.

[0076] It should be noted that after the thermal battery module 410 is activated, the thermal battery module 410 will supply power to the first power management module 420, and the first power management module 420 will also supply power to the control module 400. The power supply of the thermal battery module 410 is unstable in the early stage of activation. Since the first power management module 420 can monitor the power supply status of the thermal battery module 410, the first power management module 420 will not turn on the control module 400. In this state, the first power management module 420 supplies power to the control module 400, so that the control module 400 is connected to the power supply, but the control module 400 is still in a non-operating state, and the power-on switch module 423 needs to be powered on after the voltage of the energy storage module 422 is greater than the first threshold value and the output voltage of the voltage stabilizing output module 424 reaches the target value to trigger the control module 400 to start (enable), so that the control module 400 starts and starts running.

[0077] In some embodiments, the power-on switch module 423 controls the operation of the control module 400 to be preset after the voltage of the energy storage module 422 is greater than the first threshold and the output voltage of the voltage-stabilizing output module 424 reaches the target value, so that the control module 400 can be powered on with a delay, and the preset time of the delayed power-on can be pre-set according to actual conditions. The power-on switch module 423 can be a dual-channel voltage comparator.

[0078] In some embodiments, the control module 400 includes: a main control module 440, a positioning module 450 and a temperature acquisition module 430. The control module 400 can be powered on to control the main control module 440, and the positioning module 450 and the temperature acquisition module 430 can be in operation after the first power management module 420 supplies power.

[0079] In some embodiments, the main control module 440 is connected to the positioning module 450 and the temperature acquisition module 430 respectively. The main control module 440 is used to control the positioning module 450 to obtain location information when the temperature collected by the temperature acquisition module 430 reaches a second threshold, and send an alarm message carrying the location information.

[0080] The temperature acquisition module 430 may be disposed on the outer wall of the heat-insulating shell 300 , and the temperature acquisition module 430 may be a temperature sensor, through which the temperature around the thermal runaway alarm device is acquired.

[0081] The positioning module 450 may be a GPS positioning module 450, which determines the location information corresponding to the current location, so that the location information can be sent to the corresponding terminal of the fire extinguishing center, thereby completing the automatic alarm so that the staff of the fire extinguishing center can extinguish the fire.

[0082] In some embodiments, the main control module 440 may record the monitored lithium battery pack parameters, which may be: power battery pack type, manufacturer, production date, capacity and voltage platform. When sending an alarm message, the corresponding lithium battery pack parameters may also be carried, so that the corresponding fire extinguishing plan can be determined according to the power battery pack parameters and the quality of the power battery can be evaluated.

[0083] In some embodiments, the main control module 440 may include: a second power management module 441, a first logic control module 442, a first RF driving module 443 and a level conversion module 444, the second power management module 441 is used to convert the voltage output by the voltage stabilization output module 424 into a voltage that can be used by the main control module 440, the first logic control module 442 is used to control the positioning module 450 to obtain location information, the first RF driving module 443 is used to send lithium battery pack parameters, and the level conversion module 444 is used to convert the control signal sent by the main control module 440 into a signal that can be recognized by the positioning module 450

[0084] In some embodiments, the positioning module 450 may include: a third power management module 451, a second logic control module 452 and a second RF driver module 453, the third power management module 451 is used to convert the voltage output by the voltage stabilization output module 424 into a voltage that can be used by the positioning module 450, the second logic control module 452 is used to determine the location information, and the second RF driver module 453 is used to send the location information.

[0085] In some embodiments, the main control module 440 is used to send a thermal runaway alarm device failure signal when the temperature collected by the temperature collection module 430 does not reach the second threshold.

[0086] It should be noted that due to unexpected damage of the thermal battery module 410 in the thermal runaway alarm device during use, the thermal battery module 410 may be activated. In this case, the activation is not caused by the thermal runaway of the monitored lithium battery. Therefore, the temperature collected by the temperature acquisition module 430 does not reach the second threshold, and therefore, a thermal runaway alarm device failure signal is sent to indicate that the thermal runaway alarm device has failed. Whether sending an alarm signal or a failure signal, it stops after the power of the thermal runaway alarm device is exhausted.

[0087] In an embodiment of the present application, the thermal battery module outputs voltage to the battery management module after the temperature reaches a first threshold and is activated. The thermal battery module does not self-discharge, and the first power management module is connected to the control module, and then the control module is powered by the first power management module according to the power supply status of the thermal battery module, so that the control module performs a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of lithium battery management.

[0088] like Figure 7 As shown, the present application provides a flow chart of a thermal runaway alarm method, the device includes: a thermal battery module 410, a battery management module and a control module 400, the method is composed of Figure 3 The thermal runaway alarm device in the illustrated embodiment is implemented, and the method includes:

[0089] Step 601, if the thermal battery module 410 is activated when the temperature reaches a first threshold, the thermal battery module 410 is used to supply power to the battery management module 420; the first power management module 420 is used to control the control module 400 to power on according to the power supply state of the thermal battery module 410;

[0090] Step 602: The control module 400 issues a thermal runaway alarm when the acquired temperature reaches a second threshold.

[0091] In an embodiment of the present application, the thermal battery module 410 outputs a voltage to the battery management module after the temperature reaches a first threshold and is activated. The thermal battery module 410 does not self-discharge, and the first power management module 420 is connected to the control module 400. The control module 400 is then powered by the first power management module 420 according to the power supply status of the thermal battery module 410, so that the control module 400 issues a thermal runaway alarm when the temperature reaches a second threshold, thereby improving the safety and reliability of lithium battery management.

[0092] In a possible implementation, the first power management module 420 includes: a voltage stabilizing input module 421, an energy storage module 422, a power-on switch module 423, a voltage stabilizing output module 424 and a monitoring module 425; the voltage stabilizing input module 421 boosts the received voltage and inputs it to the energy storage module 422; the voltage stabilizing output module 424 stabilizes the voltage output by the energy storage module 422 and reduces the voltage to the target voltage;

[0093] The power-on switch module 423 is used to trigger the control module 400 to power on after the voltage of the energy storage module 422 is greater than the first threshold and the output voltage of the voltage-stabilizing output module 424 reaches the target value;

[0094] The voltage stabilizing output module 424 supplies power to the monitoring module 425 and resets the control module 400 when the control module 400 is abnormal.

[0095] In one possible implementation, the control module 400 includes: a main control module 440, a positioning module 450 and a temperature acquisition module 430. When the temperature collected by the temperature acquisition module 430 reaches a second threshold, the main control module 440 controls the positioning module 450 to obtain location information and sends an alarm message carrying the location information.

[0096] Each functional module in each embodiment of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

[0097] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A thermal runaway alarm device, characterized in that: The device comprises: a thermal battery module (410), a first power management module (420) and a control module (400); wherein: The thermal battery module (410) is connected to the first power management module (420), and the thermal battery module (410) supplies power to the battery management module after being activated when the temperature reaches a first threshold; The first power management module (420) is connected to the control module (400), and the first power management module (420) is used to control the control module (400) to power on according to the power supply status of the thermal battery module (410); the control module (400) is used to issue a thermal runaway alarm when the acquired temperature reaches a second threshold.

2. The device according to claim 1, characterized in that The thermal battery module (410) comprises: a module housing (130), a battery cell (140), a first pole lug (110), and a second pole lug (120); wherein: The module housing (130) has a receiving cavity, the receiving cavity comprising a first side wall (131) and a second side wall (132), the first side wall (131) being provided with a first through hole (100) communicating with the receiving cavity, and the second pole lug (120) being provided on the second side wall (132); The battery core (140) is a multi-layer electrode stacking structure, and the battery core (140) is located in the accommodating cavity; The second side wall (132) is provided with a second through hole (160), and the first electrode tab (110) passes through the second through hole (160) to be connected to the battery cell (140).

3. The device according to claim 2, characterized in that The accommodating cavity further comprises a third side wall (133), the third side wall (133) being arranged opposite to the first side wall (131), the third side wall (133) being provided with a third through hole (150) corresponding to the first through hole (100), and the first through hole (100) being in communication with the third through hole (150).

4. The device according to claim 2, characterized in that The battery cell (140) comprises: a plurality of thermal battery units (250) connected in series, each thermal battery unit (250) being a three-layer electrode stacking structure.

5. The device according to claim 2, characterized in that Each thermal battery unit (250) comprises: a positive electrode plate (200), a negative electrode plate (210) and an electrolyte (220), wherein the negative electrode plate (210) is connected to the first side wall, and the negative electrode plate (210), the electrolyte 220 and the positive electrode plate (210) are stacked in sequence.

6. The device according to claim 5, characterized in that The negative electrode plate (210) is lithium silicide, the positive electrode plate (200) is a ferrous sulfide-cobalt sulfide mixture, and the electrolyte (220) is a lithium chloride-potassium chloride mixture.

7. The device according to claim 1, characterized in that The first power management module (420) comprises: a voltage stabilization input module (421), an energy storage module (422), a power-on switch module (423), a voltage stabilization output module (424) and a monitoring module (425); The voltage-stabilizing input module (421) is connected to the thermal battery module (410) and the energy storage module (422) respectively, and the voltage-stabilizing input module (421) is used to boost the voltage input from the thermal battery module (410) and then input the voltage to the energy storage module (422); The energy storage module (422) is connected to the voltage stabilization output module (424); the voltage stabilization output module (424) is used to stabilize the voltage output by the energy storage module (422) and reduce the voltage to a target voltage; The power-on switch module (423) is connected to the voltage-stabilizing output module (424) and the energy storage module (422) respectively; the power-on switch module (423) is used to trigger the control module (400) to power on after the voltage of the energy storage module (422) is greater than a first threshold value and the output voltage of the voltage-stabilizing output module (424) reaches the target value; The voltage stabilizing output module (424) is connected to the monitoring module (425), the voltage stabilizing output module (424) supplies power to the monitoring module (425), and the monitoring module (425) is used to reset the control module (400) when the control module (400) is abnormal.

8. The device according to claim 1, characterized in that The control module (400) comprises: a main control module (440), a positioning module (450) and a temperature acquisition module (430); the main control module (440) is connected to the positioning module (450) and the temperature acquisition module (430) respectively; the main control module (440) is used to control the positioning module (450) to perform positioning to obtain position information when the temperature collected by the temperature acquisition module (430) reaches a second threshold, and to send an alarm message carrying the position information.

9. The device according to claim 1, characterized in that The device further comprises: a heat-insulating shell (300) and a heat-insulating member (310); the heat-insulating member (310) is attached to the inner wall of the heat-insulating shell (300); the heat-insulating member (310) is arranged to form a cavity; and the first power management module (420) and the control module (400) are arranged in the cavity.

10. A thermal runaway alarm method, the method using a thermal runaway alarm device, the device comprising: A thermal battery module (410), a battery management module and a control module (400), the method comprising: If the thermal battery module (410) is activated when the temperature reaches a first threshold, the thermal battery module (410) is used to supply power to the battery management module (420); the first power management module (420) is used to control the control module (400) to power on according to the power supply status of the thermal battery module (410); and the control module (400) issues a thermal runaway alarm when the acquired temperature reaches a second threshold.

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